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* [PATCH v9 00/14] USB OTG/dual-role framework
@ 2016-06-08  9:03 Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
                   ` (14 more replies)
  0 siblings, 15 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

Hi,

This series centralizes OTG/Dual-role functionality in the kernel.
As of now I've got Dual-role functionality working pretty reliably on
dra7-evm and am437x-gp-evm.

DWC3 controller and TI platform related patches will be sent separately.

Series is based on v4.7-rc1.

Why?:
----

Currently there is no central location where OTG/dual-role functionality is
implemented in the Linux USB stack and every USB controller driver is
doing their own thing for OTG/dual-role. We can benefit from code-reuse
and simplicity by adding the OTG/dual-role core driver.

Newer OTG cores support standard host interface (e.g. xHCI) so
host and gadget functionality are no longer closely knit like older
cores. There needs to be a way to co-ordinate the operation of the
host and gadget controllers in dual-role mode. i.e. to stop and start them
from a central location. This central location should be the
USB OTG/dual-role core.

Host and gadget controllers might be sharing resources and can't
be always running. One has to be stopped for the other to run.
This couldn't be done till now but can be done from the OTG core.

What?:
-----

The OTG/dual-role core consists of a set of APIs that allow
registration of OTG controller device and OTG capable host and gadget
controllers.

- The OTG controller driver can provide the OTG capabilities and the
Finite State Machine work function via 'struct usb_otg_config'
at the time of registration i.e. usb_otg_register();

	struct usb_otg *usb_otg_register(struct device *dev,
        	                         struct usb_otg_config *config);
	int usb_otg_unregister(struct device *dev);
	/**
	 * struct usb_otg_config - otg controller configuration
	 * @caps: otg capabilities of the controller
	 * @ops: otg fsm operations
	 * @otg_work: optional custom otg state machine work function
	 */
	struct usb_otg_config {
	        struct usb_otg_caps *otg_caps;
	        struct otg_fsm_ops *fsm_ops;
	        void (*otg_work)(struct work_struct *work);
	};

The dual-role state machine is built-into the OTG core so nothing
special needs to be provided if only dual-role functionality is desired.
The low level OTG controller driver ops are povided via
'struct otg_fsm_ops *fsm_ops' in the 'struct usb_otg_config'.

After registration, the OTG core waits for host, gadget controller
and the gadget function driver to be registered. Once all resources are
available it instantiates the Finite State Machine (FSM).
The host/gadget controllers are started/stopped according to the FSM.

- Host and gadget controllers that are a part of OTG/dual-role port must
use the OTG core provided APIs to add/remove the host/gadget.
i.e. hosts must use usb_otg_add_hcd() usb_otg_remove_hcd(),,
gadgets must use usb_otg_add_gadget_udc() usb_del_gadget_udc().
This ensures that the host and gadget controllers are not started till
the state machine is ready and the right bus conditions are met.
It also allows the host and gadget controllers to provide the OTG
controller device to link them together. For Device tree boots
the related OTG controller is automatically picked up via the
'otg-controller' property in the Host/Gadget controller nodes.

	int usb_otg_add_hcd(struct usb_hcd *hcd,
			    unsigned int irqnum, unsigned long irqflags,
			    struct device *otg_dev);
	void usb_otg_remove_hcd(struct usb_hcd *hcd);

	int usb_otg_add_gadget_udc(struct device *parent,
				   struct usb_gadget *gadget,
				   struct device *otg_dev);
	usb_del_gadget_udc() must be used for removal.


- During the lifetime of the FSM, the OTG controller driver can provide
inputs event changes using usb_otg_sync_inputs(). The OTG core will
then schedule the FSM work function (or internal dual-role state machine)
to update the FSM state. The FSM then calls the OTG controller
operations (fsm_ops) as necessary.
	void usb_otg_sync_inputs(struct usb_otg *otg);

- The following 2 functions are provided as helpers for use by the
OTG controller driver to start/stop the host/gadget controllers.
	int usb_otg_start_host(struct usb_otg *otg, int on);
	int usb_otg_start_gadget(struct usb_otg *otg, int on);

- The following function is provided for use by the USB host stack
to sync OTG related events to the OTG state machine.
e.g. change in host_bus->b_hnp_enable, gadget->b_hnp_enable
	int usb_otg_kick_fsm(struct device *otg_device);

- The following function is provided for use by the USB gadget stack
to notify OTG/DRD about gadget function driver being ready/not-ready
	int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)

Changelog:
---------
v9:
- In the DT bindings, clearly indicate which properties are for OTG controller
and which ones are for host/device controllers
- Removed host/gadget wait list from otg core. Use defer probing if host/gadget
registers before dual-role/otg controller.
- move gadget registering to otg core from udc_bind_to_driver()/usb_gadget_remove_driver()
to usb_add_gadget_udc_release()/usb_del_gadget_udc(). This means that we need
an additional mechanism to know when the gadget function driver registers.
So we add usb_otg_gadget_ready() API to allow gadget to notify otg core about
ready/not-ready function driver.
- update otg->caps based on capabilities provided by the controller and the
device tree overrides.
- in usb_drd_work() we must keep calling the drd_statemachine() as long as
there is a state change.
- updated kconfig so that usbotg can be a module when both host and gadget
are modules.
- rebased on v4.7-rc1

v8:
- split out start/stop gadget and connect/disconnect operations.
- make CONFIG_OTG dpend on CONFIG_USB_GADGET as well apart from CONFIG_USB
- use create_freezable_workqueue() for OTG work as per Peter's suggestion.
- remove usb-otg.h as we're not initializing any OTG timers.
- don't include unnecessary headers in usb-otg.c (i.e. hrtimer.h & ktime.h)

v7:
- added dual-role support for host controllers requiring a companion
controller. e.g. EHCI + OHCI.
- added of_usb_get_otg() to get the OTG controller device
from the USB controller's device node.
- addressed review comments.

v6:
- added otg specific APIs for host/gadget registration. behaviour of
original host/gadget API remains unchanged. Platform devices can now
pass the otg device explicitly while registering host/gadget.
- moved hcd specific operations from struct otg_fsm to struct hcd_ops.
- made struct usb_otg mandatory for all otg related APIs.
- allow otg controller to provide it's own otg_work function so that
it can implement it's own state machine.
- removed otg fsm and timers from usb-otg.c. Only dual-role state machine
is implemented.
- vbus is controlled in the dual-role state machine.
- PM runtime is used around drd_statemachine().
- added otg_dev to xhci platform data to allow platform code to specify
the otg controller tied to the xhci host controller.

v5: Internal version. Not sent to mailing list

v4:
- Added DT support for tying otg-controller to host and gadget
 controllers. For DT we no longer have the constraint that
 OTG controller needs to be parent of host and gadget. They can be
 tied together using the "otg-controller" property.
- Relax the requirement for DT case that otg controller must register
 before host/gadget. We maintain a wait list of host/gadget devices
 waiting on the otg controller.
- Use a single struct usb_otg for otg data.
- Don't override host/gadget start/stop APIs. Let the controller
 drivers do what they want as they know best. Helper API is provided
 for controller start/stop that controller driver can use.
- Introduce struct usb_otg_config to pass the otg capabilities,
 otg ops and otg timer timeouts during otg controller registration.
- rebased on Greg's usb.git/usb-next

v3:
- all otg related definations now in otg.h
- single kernel config USB_OTG to enable OTG core and FSM.
- resolved symbol dependency issues.
- use dev_vdbg instead of VDBG() in usb-otg-fsm.c
- rebased on v4.2-rc1

v2:
- Use add/remove_hcd() instead of start/stop_hcd() to enable/disable
 the host controller
- added dual-role-device (DRD) state machine which is a much simpler
 mode of operation when compared to OTG. Here we don't support fancy
 OTG features like HNP, SRP, on the fly role-swap. The mode of operation
 is determined based on ID pin (cable type) and the role doesn't change
 till the cable type changes.

--
cheers,
-roger

Roger Quadros (13):
  usb: hcd: Initialize hcd->flags to 0
  usb: otg-fsm: Prevent build warning "VDBG" redefined
  usb: hcd.h: Add OTG to HCD interface
  usb: otg-fsm: use usb_otg wherever possible
  usb: otg-fsm: move host controller operations into usb_otg->hcd_ops
  usb: gadget.h: Add OTG to gadget interface
  usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG
  usb: otg: add OTG/dual-role core
  usb: of: add an API to get OTG device from USB controller node
  usb: otg: use dev_dbg() instead of VDBG()
  usb: hcd: Adapt to OTG core
  usb: gadget: udc: adapt to OTG core
  usb: host: xhci-plat: Add otg device to platform data

Yoshihiro Shimoda (1):
  usb: otg: add hcd companion support

 Documentation/devicetree/bindings/usb/generic.txt |   6 +
 Documentation/usb/chipidea.txt                    |   2 +-
 drivers/usb/Kconfig                               |  18 +
 drivers/usb/Makefile                              |   1 +
 drivers/usb/chipidea/Makefile                     |   2 +-
 drivers/usb/chipidea/ci.h                         |   3 +-
 drivers/usb/chipidea/core.c                       |  14 +-
 drivers/usb/chipidea/debug.c                      |   2 +-
 drivers/usb/chipidea/otg_fsm.c                    | 176 ++---
 drivers/usb/chipidea/otg_fsm.h                    |   2 +-
 drivers/usb/chipidea/udc.c                        |  17 +-
 drivers/usb/common/Makefile                       |   5 +-
 drivers/usb/common/common.c                       |  27 +
 drivers/usb/common/usb-otg-fsm.c                  | 203 +++---
 drivers/usb/common/usb-otg.c                      | 846 ++++++++++++++++++++++
 drivers/usb/core/Kconfig                          |  22 -
 drivers/usb/core/hcd.c                            |  56 ++
 drivers/usb/gadget/Kconfig                        |   1 +
 drivers/usb/gadget/udc/udc-core.c                 | 202 +++++-
 drivers/usb/host/xhci-plat.c                      |  35 +-
 drivers/usb/phy/Kconfig                           |   2 +-
 drivers/usb/phy/phy-fsl-usb.c                     | 155 ++--
 drivers/usb/phy/phy-fsl-usb.h                     |   3 +-
 include/linux/usb/gadget.h                        |  22 +
 include/linux/usb/hcd.h                           |  29 +
 include/linux/usb/of.h                            |   9 +
 include/linux/usb/otg-fsm.h                       | 154 +---
 include/linux/usb/otg.h                           | 293 +++++++-
 include/linux/usb/xhci_pdriver.h                  |   3 +
 29 files changed, 1848 insertions(+), 462 deletions(-)
 create mode 100644 drivers/usb/common/usb-otg.c

-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 01/14] usb: hcd: Initialize hcd->flags to 0
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
                   ` (13 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

When using the OTG/drd library we can call hcd_add/remove
consecutively without calling usb_put_hcd/usb_create_hcd in between
so hcd->flags can be stale.

If the HC dies due to whatever reason then without this
patch we get the below error on next hcd_add.

[   91.494257] xhci-hcd xhci-hcd.0.auto: HC died; cleaning up
[   91.502068] hub 3-0:1.0: state 0 ports 1 chg 0000 evt 0000
[   91.510240] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
[   91.516940] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 4
[   91.529745] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM.
[   91.540637] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003
[   91.757865] irq 254: nobody cared (try booting with the "irqpoll" option)
[   91.757880] CPU: 0 PID: 68 Comm: kworker/u2:2 Not tainted 4.1.4-00828-g1f0ed8c-dirty #44
[   91.757885] Hardware name: Generic AM43 (Flattened Device Tree)
[   91.757914] Workqueue: usb_otg usb_otg_work
[   91.757921] Backtrace:
[   91.757954] [<c0012af0>] (dump_backtrace) from [<c0012c8c>] (show_stack+0x18/0x1c)
[   91.757972]  r6:c089d4a4 r5:ffffffff r4:00000000 r3:ee440000
[   91.757991] [<c0012c74>] (show_stack) from [<c05f7c14>] (dump_stack+0x84/0xd0)
[   91.758008] [<c05f7b90>] (dump_stack) from [<c0084b30>] (__report_bad_irq+0x28/0xc8)
[   91.758024]  r7:00000000 r6:000000fe r5:00000000 r4:ee514c40
[   91.758037] [<c0084b08>] (__report_bad_irq) from [<c00850b0>] (note_interrupt+0x24c/0x2ac)
[   91.758052]  r6:000000fe r5:00000000 r4:ee514c40 r3:00000000
[   91.758065] [<c0084e64>] (note_interrupt) from [<c00828fc>] (handle_irq_event_percpu+0xb0/0x158)
[   91.758085]  r10:ee514c40 r9:c08ce49a r8:000000fe r7:00000000 r6:00000000 r5:00000000
[   91.758094]  r4:00000000 r3:00000000
[   91.758105] [<c008284c>] (handle_irq_event_percpu) from [<c00829e8>] (handle_irq_event+0x44/0x64)
[   91.758126]  r10:00000001 r9:ee441ab0 r8:ee441bb8 r7:c0858b4c r6:ed174280 r5:ee514ca0
[   91.758132]  r4:ee514c40
[   91.758144] [<c00829a4>] (handle_irq_event) from [<c0085970>] (handle_fasteoi_irq+0x100/0x1bc)
[   91.758159]  r6:c085dba0 r5:ee514ca0 r4:ee514c40 r3:00000000
[   91.758171] [<c0085870>] (handle_fasteoi_irq) from [<c0082058>] (generic_handle_irq+0x28/0x38)
[   91.758186]  r7:c0853d40 r6:c0858b4c r5:000000fe r4:000000fe
[   91.758197] [<c0082030>] (generic_handle_irq) from [<c00821c0>] (__handle_domain_irq+0x98/0x12c)
[   91.758207]  r4:c0853d40 r3:00000100
[   91.758219] [<c0082128>] (__handle_domain_irq) from [<c00094e0>] (gic_handle_irq+0x28/0x68)
[   91.758239]  r10:00000001 r9:ee441bb8 r8:fa240100 r7:c0858d70 r6:ee441ab0 r5:000000b8
[   91.758245]  r4:fa24010c
[   91.758264] [<c00094b8>] (gic_handle_irq) from [<c05fd540>] (__irq_svc+0x40/0x74)
[   91.758271] Exception stack(0xee441ab0 to 0xee441af8)
[   91.758280] 1aa0:                                     00000000 c08d2980 ee441ac0 00000000
[   91.758292] 1ac0: 00000008 00000089 c0858b4c c0858080 00000000 ee441bb8 00000001 ee441b3c
[   91.758301] 1ae0: 00000101 ee441af8 c02fc418 c0046a1c 20000113 ffffffff
[   91.758321]  r8:00000000 r7:ee441ae4 r6:ffffffff r5:20000113 r4:c0046a1c r3:c02fc418
[   91.758347] [<c00469a0>] (__do_softirq) from [<c0046eac>] (irq_exit+0xb8/0x104)
[   91.758367]  r10:00000001 r9:ee441bb8 r8:00000000 r7:c0853d40 r6:c0858b4c r5:00000089
[   91.758373]  r4:00000000
[   91.758386] [<c0046df4>] (irq_exit) from [<c00821c8>] (__handle_domain_irq+0xa0/0x12c)
[   91.758395]  r4:00000000 r3:00000100
[   91.758406] [<c0082128>] (__handle_domain_irq) from [<c00094e0>] (gic_handle_irq+0x28/0x68)
[   91.758426]  r10:c08e3510 r9:20000013 r8:fa240100 r7:c0858d70 r6:ee441bb8 r5:00000039
[   91.758433]  r4:fa24010c
[   91.758445] [<c00094b8>] (gic_handle_irq) from [<c05fd540>] (__irq_svc+0x40/0x74)
[   91.758450] Exception stack(0xee441bb8 to 0xee441c00)
[   91.758457] 1ba0:                                                       00000000 00000001
[   91.758468] 1bc0: 00000000 ee440000 c08e2524 0000004d 00000274 00000000 00000000 20000013
[   91.758479] 1be0: c08e3510 ee441c4c ee441b60 ee441c00 c03acfec c0080d4c 60000013 ffffffff
[   91.758499]  r8:00000000 r7:ee441bec r6:ffffffff r5:60000013 r4:c0080d4c r3:c03acfec
[   91.758524] [<c0080950>] (console_unlock) from [<c0081670>] (vprintk_emit+0x20c/0x500)
[   91.758544]  r10:ee441cc0 r9:c08d3550 r8:c08e3ea0 r7:00000000 r6:00000001 r5:0000003d
[   91.758551]  r4:c08d3550
[   91.758573] [<c0081464>] (vprintk_emit) from [<c03f6f70>] (dev_vprintk_emit+0x104/0x1ac)
[   91.758593]  r10:ee441d8c r9:0000000e r8:c07951e0 r7:00000006 r6:ee441cc0 r5:0000000d
[   91.758599]  r4:ee731068
[   91.758612] [<c03f6e6c>] (dev_vprintk_emit) from [<c03f7040>] (dev_printk_emit+0x28/0x30)
[   91.758632]  r10:00000001 r9:ee5f8410 r8:ee731000 r7:ed429000 r6:00000006 r5:ee441dc0
[   91.758638]  r4:ee731068
[   91.758651] [<c03f701c>] (dev_printk_emit) from [<c03f7098>] (__dev_printk+0x50/0x70)
[   91.758660]  r3:bf2268cc r2:c07951e0
[   91.758673] [<c03f7048>] (__dev_printk) from [<c03f70f4>] (_dev_info+0x3c/0x48)
[   91.758686]  r6:00000000 r5:ee731068 r4:ee731000
[   91.758790] [<c03f70bc>] (_dev_info) from [<bf20ec3c>] (usb_new_device+0x11c/0x518 [usbcore])
[   91.758804]  r3:00000003 r2:00001d6b r1:bf225bc4
[   91.758881] [<bf20eb20>] (usb_new_device [usbcore]) from [<bf213560>] (usb_otg_add_hcd+0x514/0x7f8 [usbcore])
[   91.758903]  r10:00000001 r9:ee5f8410 r8:ee731000 r7:000000fe r6:ed4290c8 r5:00000000
[   91.758909]  r4:ed429000
[   91.758957] [<bf21304c>] (usb_otg_add_hcd [usbcore]) from [<c047a238>] (usb_otg_start_host+0xb8/0xf8)
[   91.758978]  r10:00000000 r9:00000002 r8:00000000 r7:ee02b000 r6:ee452808 r5:ee452808
[   91.758985]  r4:ee452808
[   91.758997] [<c047a180>] (usb_otg_start_host) from [<c047a020>] (drd_set_protocol+0xac/0xd8)
[   91.759007]  r4:00000001 r3:c047a180
[   91.759018] [<c0479f74>] (drd_set_protocol) from [<c047a2ec>] (drd_set_state+0x74/0x98)
[   91.759027]  r5:ee452808 r4:00000009
[   91.759039] [<c047a278>] (drd_set_state) from [<c047a3dc>] (usb_otg_work+0xcc/0x154)
[   91.759054]  r6:ee452808 r5:ee4528b8 r4:ee452968 r3:00000000
[   91.759072] [<c047a310>] (usb_otg_work) from [<c005754c>] (process_one_work+0x128/0x340)
[   91.759087]  r6:ee02ac00 r5:ee452968 r4:ee42b900 r3:c047a310
[   91.759100] [<c0057424>] (process_one_work) from [<c00578f8>] (worker_thread+0x158/0x49c)
[   91.759120]  r10:ee42b900 r9:00000002 r8:ee02ac00 r7:00000088 r6:ee42b918 r5:ee02ac00
[   91.759127]  r4:ee02ac14
[   91.759145] [<c00577a0>] (worker_thread) from [<c005cc40>] (kthread+0xdc/0xf8)
[   91.759165]  r10:00000000 r9:00000000 r8:00000000 r7:c00577a0 r6:ee42b900 r5:ee429940
[   91.759174]  r4:00000000 r3:00000000
[   91.759190] [<c005cb64>] (kthread) from [<c000fc08>] (ret_from_fork+0x14/0x2c)
[   91.759206]  r7:00000000 r6:00000000 r5:c005cb64 r4:ee429940
[   91.759209] handlers:
[   91.759255] [<bf211b5c>] usb_hcd_irq [usbcore]
[   91.759260] Disabling IRQ #254

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/core/hcd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 34b837a..ae6c76d 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -3021,6 +3021,7 @@ void usb_remove_hcd(struct usb_hcd *hcd)
 	}
 
 	usb_put_invalidate_rhdev(hcd);
+	hcd->flags = 0;
 }
 EXPORT_SYMBOL_GPL(usb_remove_hcd);
 
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
                   ` (12 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

If usb/otg-fsm.h and usb/composite.h are included together
then it results in the build warning [1].

Prevent that by defining VDBG locally.

Also get rid of MPC_LOC which doesn't seem to be used
by anyone.

[1] - warning fixed by this patch:

In file included from drivers/usb/dwc3/core.h:33,
   from drivers/usb/dwc3/ep0.c:33:
   include/linux/usb/otg-fsm.h:30:1: warning: "VDBG" redefined
   In file included from drivers/usb/dwc3/ep0.c:31:
   include/linux/usb/composite.h:615:1: warning: this is the location
   of the previous definition

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/common/usb-otg-fsm.c |  7 +++++++
 drivers/usb/phy/phy-fsl-usb.c    |  7 +++++++
 include/linux/usb/otg-fsm.h      | 15 ---------------
 3 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
index 9059b7d..199dee0 100644
--- a/drivers/usb/common/usb-otg-fsm.c
+++ b/drivers/usb/common/usb-otg-fsm.c
@@ -30,6 +30,13 @@
 #include <linux/usb/otg.h>
 #include <linux/usb/otg-fsm.h>
 
+#ifdef VERBOSE
+#define VDBG(fmt, args...) pr_debug("[%s]  " fmt, \
+				 __func__, ## args)
+#else
+#define VDBG(stuff...)	do {} while (0)
+#endif
+
 /* Change USB protocol when there is a protocol change */
 static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 {
diff --git a/drivers/usb/phy/phy-fsl-usb.c b/drivers/usb/phy/phy-fsl-usb.c
index 94eb292..a8784ec 100644
--- a/drivers/usb/phy/phy-fsl-usb.c
+++ b/drivers/usb/phy/phy-fsl-usb.c
@@ -44,6 +44,13 @@
 
 #include "phy-fsl-usb.h"
 
+#ifdef VERBOSE
+#define VDBG(fmt, args...) pr_debug("[%s]  " fmt, \
+				 __func__, ## args)
+#else
+#define VDBG(stuff...)	do {} while (0)
+#endif
+
 #define DRIVER_VERSION "Rev. 1.55"
 #define DRIVER_AUTHOR "Jerry Huang/Li Yang"
 #define DRIVER_DESC "Freescale USB OTG Transceiver Driver"
diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
index 7a03505..a0a8f87 100644
--- a/include/linux/usb/otg-fsm.h
+++ b/include/linux/usb/otg-fsm.h
@@ -21,21 +21,6 @@
 #include <linux/mutex.h>
 #include <linux/errno.h>
 
-#undef VERBOSE
-
-#ifdef VERBOSE
-#define VDBG(fmt, args...) pr_debug("[%s]  " fmt , \
-				 __func__, ## args)
-#else
-#define VDBG(stuff...)	do {} while (0)
-#endif
-
-#ifdef VERBOSE
-#define MPC_LOC printk("Current Location [%s]:[%d]\n", __FILE__, __LINE__)
-#else
-#define MPC_LOC do {} while (0)
-#endif
-
 #define PROTO_UNDEF	(0)
 #define PROTO_HOST	(1)
 #define PROTO_GADGET	(2)
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08 11:39   ` Sergei Shtylyov
  2016-06-09  7:51   ` [PATCH v10 " Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
                   ` (11 subsequent siblings)
  14 siblings, 2 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

The OTG core will use struct otg_hcd_ops to interface
with the HCD controller.

The main purpose of this interface is to avoid directly
calling HCD APIs from the OTG core as they
wouldn't be defined in the built-in symbol table if
CONFIG_USB is m.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 include/linux/usb/hcd.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 66fc137..7914bed 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -400,6 +400,30 @@ struct hc_driver {
 
 };
 
+/**
+ * struct otg_hcd_ops - Interface between OTG core and HCD
+ *
+ * Provided by the HCD core to allow the OTG core to interface with the HCD
+ *
+ * @add: function to add the HCD
+ * @remove: function to remove the HCD
+ * @usb_bus_start_enum: function to immediately start bus enumeration
+ * @usb_control_msg: function to build and send of a control urb
+ * @usb_hub_find_child: function to get pointer to the child device
+ */
+struct otg_hcd_ops {
+	int (*add)(struct usb_hcd *hcd,
+		   unsigned int irqnum, unsigned long irqflags);
+	void (*remove)(struct usb_hcd *hcd);
+	int (*usb_bus_start_enum)(struct usb_bus *bus, unsigned int port_num);
+	int (*usb_control_msg)(struct usb_device *dev, unsigned int pipe,
+			       __u8 request, __u8 requesttype, __u16 value,
+			       __u16 index, void *data, __u16 size,
+			       int timeout);
+	struct usb_device * (*usb_hub_find_child)(struct usb_device *hdev,
+						  int port1);
+};
+
 static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
 {
 	return hcd->driver->flags & HCD_BH;
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 04/14] usb: otg-fsm: use usb_otg wherever possible
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (2 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
                   ` (10 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

Move otg_fsm into usb_otg and use usb_otg wherever possible
in the usb_otg APIs.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/chipidea/ci.h        |   1 -
 drivers/usb/chipidea/core.c      |  14 +--
 drivers/usb/chipidea/debug.c     |   2 +-
 drivers/usb/chipidea/otg_fsm.c   | 169 ++++++++++++++++++------------------
 drivers/usb/chipidea/udc.c       |  17 ++--
 drivers/usb/common/usb-otg-fsm.c | 180 ++++++++++++++++++++-------------------
 drivers/usb/phy/phy-fsl-usb.c    | 141 +++++++++++++++---------------
 drivers/usb/phy/phy-fsl-usb.h    |   3 +-
 include/linux/usb/otg-fsm.h      | 132 +++-------------------------
 include/linux/usb/otg.h          | 107 +++++++++++++++++++++++
 10 files changed, 383 insertions(+), 383 deletions(-)

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index cd41455..c523975 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -209,7 +209,6 @@ struct ci_hdrc {
 	enum ci_role			role;
 	bool				is_otg;
 	struct usb_otg			otg;
-	struct otg_fsm			fsm;
 	struct hrtimer			otg_fsm_hrtimer;
 	ktime_t				hr_timeouts[NUM_OTG_FSM_TIMERS];
 	unsigned			enabled_otg_timer_bits;
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 69426e6..56b6ac6 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -1085,8 +1085,8 @@ static int ci_hdrc_remove(struct platform_device *pdev)
 /* Prepare wakeup by SRP before suspend */
 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
 {
-	if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
-				!hw_read_otgsc(ci, OTGSC_ID)) {
+	if ((ci->otg.state == OTG_STATE_A_IDLE) &&
+	    !hw_read_otgsc(ci, OTGSC_ID)) {
 		hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
 								PORTSC_PP);
 		hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
@@ -1097,13 +1097,13 @@ static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
 /* Handle SRP when wakeup by data pulse */
 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
 {
-	if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
-		(ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
+	if ((ci->otg.state == OTG_STATE_A_IDLE) &&
+	    (ci->otg.fsm.a_bus_drop == 1) && (ci->otg.fsm.a_bus_req == 0)) {
 		if (!hw_read_otgsc(ci, OTGSC_ID)) {
-			ci->fsm.a_srp_det = 1;
-			ci->fsm.a_bus_drop = 0;
+			ci->otg.fsm.a_srp_det = 1;
+			ci->otg.fsm.a_bus_drop = 0;
 		} else {
-			ci->fsm.id = 1;
+			ci->otg.fsm.id = 1;
 		}
 		ci_otg_queue_work(ci);
 	}
diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 6d23eed..374cdaa 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -224,7 +224,7 @@ static int ci_otg_show(struct seq_file *s, void *unused)
 	if (!ci || !ci_otg_is_fsm_mode(ci))
 		return 0;
 
-	fsm = &ci->fsm;
+	fsm = &ci->otg.fsm;
 
 	/* ------ State ----- */
 	seq_printf(s, "OTG state: %s\n\n",
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
index de8e22e..1c0c750 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -40,7 +40,7 @@ get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
 
 	next = buf;
 	size = PAGE_SIZE;
-	t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_req);
+	t = scnprintf(next, size, "%d\n", ci->otg.fsm.a_bus_req);
 	size -= t;
 	next += t;
 
@@ -56,25 +56,25 @@ set_a_bus_req(struct device *dev, struct device_attribute *attr,
 	if (count > 2)
 		return -1;
 
-	mutex_lock(&ci->fsm.lock);
+	mutex_lock(&ci->otg.fsm.lock);
 	if (buf[0] == '0') {
-		ci->fsm.a_bus_req = 0;
+		ci->otg.fsm.a_bus_req = 0;
 	} else if (buf[0] == '1') {
 		/* If a_bus_drop is TRUE, a_bus_req can't be set */
-		if (ci->fsm.a_bus_drop) {
-			mutex_unlock(&ci->fsm.lock);
+		if (ci->otg.fsm.a_bus_drop) {
+			mutex_unlock(&ci->otg.fsm.lock);
 			return count;
 		}
-		ci->fsm.a_bus_req = 1;
-		if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
+		ci->otg.fsm.a_bus_req = 1;
+		if (ci->otg.state == OTG_STATE_A_PERIPHERAL) {
 			ci->gadget.host_request_flag = 1;
-			mutex_unlock(&ci->fsm.lock);
+			mutex_unlock(&ci->otg.fsm.lock);
 			return count;
 		}
 	}
 
 	ci_otg_queue_work(ci);
-	mutex_unlock(&ci->fsm.lock);
+	mutex_unlock(&ci->otg.fsm.lock);
 
 	return count;
 }
@@ -89,7 +89,7 @@ get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
 
 	next = buf;
 	size = PAGE_SIZE;
-	t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_drop);
+	t = scnprintf(next, size, "%d\n", ci->otg.fsm.a_bus_drop);
 	size -= t;
 	next += t;
 
@@ -105,16 +105,16 @@ set_a_bus_drop(struct device *dev, struct device_attribute *attr,
 	if (count > 2)
 		return -1;
 
-	mutex_lock(&ci->fsm.lock);
+	mutex_lock(&ci->otg.fsm.lock);
 	if (buf[0] == '0') {
-		ci->fsm.a_bus_drop = 0;
+		ci->otg.fsm.a_bus_drop = 0;
 	} else if (buf[0] == '1') {
-		ci->fsm.a_bus_drop = 1;
-		ci->fsm.a_bus_req = 0;
+		ci->otg.fsm.a_bus_drop = 1;
+		ci->otg.fsm.a_bus_req = 0;
 	}
 
 	ci_otg_queue_work(ci);
-	mutex_unlock(&ci->fsm.lock);
+	mutex_unlock(&ci->otg.fsm.lock);
 
 	return count;
 }
@@ -130,7 +130,7 @@ get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
 
 	next = buf;
 	size = PAGE_SIZE;
-	t = scnprintf(next, size, "%d\n", ci->fsm.b_bus_req);
+	t = scnprintf(next, size, "%d\n", ci->otg.fsm.b_bus_req);
 	size -= t;
 	next += t;
 
@@ -146,20 +146,20 @@ set_b_bus_req(struct device *dev, struct device_attribute *attr,
 	if (count > 2)
 		return -1;
 
-	mutex_lock(&ci->fsm.lock);
+	mutex_lock(&ci->otg.fsm.lock);
 	if (buf[0] == '0')
-		ci->fsm.b_bus_req = 0;
+		ci->otg.fsm.b_bus_req = 0;
 	else if (buf[0] == '1') {
-		ci->fsm.b_bus_req = 1;
-		if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
+		ci->otg.fsm.b_bus_req = 1;
+		if (ci->otg.state == OTG_STATE_B_PERIPHERAL) {
 			ci->gadget.host_request_flag = 1;
-			mutex_unlock(&ci->fsm.lock);
+			mutex_unlock(&ci->otg.fsm.lock);
 			return count;
 		}
 	}
 
 	ci_otg_queue_work(ci);
-	mutex_unlock(&ci->fsm.lock);
+	mutex_unlock(&ci->otg.fsm.lock);
 
 	return count;
 }
@@ -174,12 +174,12 @@ set_a_clr_err(struct device *dev, struct device_attribute *attr,
 	if (count > 2)
 		return -1;
 
-	mutex_lock(&ci->fsm.lock);
+	mutex_lock(&ci->otg.fsm.lock);
 	if (buf[0] == '1')
-		ci->fsm.a_clr_err = 1;
+		ci->otg.fsm.a_clr_err = 1;
 
 	ci_otg_queue_work(ci);
-	mutex_unlock(&ci->fsm.lock);
+	mutex_unlock(&ci->otg.fsm.lock);
 
 	return count;
 }
@@ -287,64 +287,64 @@ static void ci_otg_del_timer(struct ci_hdrc *ci, enum otg_fsm_timer t)
 /* OTG FSM timer handlers */
 static int a_wait_vrise_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.a_wait_vrise_tmout = 1;
+	ci->otg.fsm.a_wait_vrise_tmout = 1;
 	return 0;
 }
 
 static int a_wait_vfall_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.a_wait_vfall_tmout = 1;
+	ci->otg.fsm.a_wait_vfall_tmout = 1;
 	return 0;
 }
 
 static int a_wait_bcon_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.a_wait_bcon_tmout = 1;
+	ci->otg.fsm.a_wait_bcon_tmout = 1;
 	return 0;
 }
 
 static int a_aidl_bdis_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.a_aidl_bdis_tmout = 1;
+	ci->otg.fsm.a_aidl_bdis_tmout = 1;
 	return 0;
 }
 
 static int b_ase0_brst_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.b_ase0_brst_tmout = 1;
+	ci->otg.fsm.b_ase0_brst_tmout = 1;
 	return 0;
 }
 
 static int a_bidl_adis_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.a_bidl_adis_tmout = 1;
+	ci->otg.fsm.a_bidl_adis_tmout = 1;
 	return 0;
 }
 
 static int b_aidl_bdis_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.a_bus_suspend = 1;
+	ci->otg.fsm.a_bus_suspend = 1;
 	return 0;
 }
 
 static int b_se0_srp_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.b_se0_srp = 1;
+	ci->otg.fsm.b_se0_srp = 1;
 	return 0;
 }
 
 static int b_srp_fail_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.b_srp_done = 1;
+	ci->otg.fsm.b_srp_done = 1;
 	return 1;
 }
 
 static int b_data_pls_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.b_srp_done = 1;
-	ci->fsm.b_bus_req = 0;
-	if (ci->fsm.power_up)
-		ci->fsm.power_up = 0;
+	ci->otg.fsm.b_srp_done = 1;
+	ci->otg.fsm.b_bus_req = 0;
+	if (ci->otg.fsm.power_up)
+		ci->otg.fsm.power_up = 0;
 	hw_write_otgsc(ci, OTGSC_HABA, 0);
 	pm_runtime_put(ci->dev);
 	return 0;
@@ -352,9 +352,9 @@ static int b_data_pls_tmout(struct ci_hdrc *ci)
 
 static int b_ssend_srp_tmout(struct ci_hdrc *ci)
 {
-	ci->fsm.b_ssend_srp = 1;
+	ci->otg.fsm.b_ssend_srp = 1;
 	/* only vbus fall below B_sess_vld in b_idle state */
-	if (ci->fsm.otg->state == OTG_STATE_B_IDLE)
+	if (ci->otg.state == OTG_STATE_B_IDLE)
 		return 0;
 	else
 		return 1;
@@ -435,18 +435,18 @@ static int ci_otg_init_timers(struct ci_hdrc *ci)
 /* -------------------------------------------------------------*/
 /* Operations that will be called from OTG Finite State Machine */
 /* -------------------------------------------------------------*/
-static void ci_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
+static void ci_otg_fsm_add_timer(struct usb_otg *otg, enum otg_fsm_timer t)
 {
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct ci_hdrc	*ci = container_of(otg, struct ci_hdrc, otg);
 
 	if (t < NUM_OTG_FSM_TIMERS)
 		ci_otg_add_timer(ci, t);
 	return;
 }
 
-static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
+static void ci_otg_fsm_del_timer(struct usb_otg *otg, enum otg_fsm_timer t)
 {
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct ci_hdrc	*ci = container_of(otg, struct ci_hdrc, otg);
 
 	if (t < NUM_OTG_FSM_TIMERS)
 		ci_otg_del_timer(ci, t);
@@ -457,10 +457,10 @@ static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
  * A-device drive vbus: turn on vbus regulator and enable port power
  * Data pulse irq should be disabled while vbus is on.
  */
-static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
+static void ci_otg_drv_vbus(struct usb_otg *otg, int on)
 {
 	int ret;
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct ci_hdrc	*ci = container_of(otg, struct ci_hdrc, otg);
 
 	if (on) {
 		/* Enable power power */
@@ -478,23 +478,23 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
 		/* Disable data pulse irq */
 		hw_write_otgsc(ci, OTGSC_DPIE, 0);
 
-		fsm->a_srp_det = 0;
-		fsm->power_up = 0;
+		otg->fsm.a_srp_det = 0;
+		otg->fsm.power_up = 0;
 	} else {
 		if (ci->platdata->reg_vbus)
 			regulator_disable(ci->platdata->reg_vbus);
 
-		fsm->a_bus_drop = 1;
-		fsm->a_bus_req = 0;
+		otg->fsm.a_bus_drop = 1;
+		otg->fsm.a_bus_req = 0;
 	}
 }
 
 /*
  * Control data line by Run Stop bit.
  */
-static void ci_otg_loc_conn(struct otg_fsm *fsm, int on)
+static void ci_otg_loc_conn(struct usb_otg *otg, int on)
 {
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct ci_hdrc	*ci = container_of(otg, struct ci_hdrc, otg);
 
 	if (on)
 		hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
@@ -511,14 +511,14 @@ static void ci_otg_loc_conn(struct otg_fsm *fsm, int on)
  * so the usb device class driver need support autosuspend,
  * otherwise the bus suspend will not happen.
  */
-static void ci_otg_loc_sof(struct otg_fsm *fsm, int on)
+static void ci_otg_loc_sof(struct usb_otg *otg, int on)
 {
 	struct usb_device *udev;
 
-	if (!fsm->otg->host)
+	if (!otg->host)
 		return;
 
-	udev = usb_hub_find_child(fsm->otg->host->root_hub, 1);
+	udev = usb_hub_find_child(otg->host->root_hub, 1);
 	if (!udev)
 		return;
 
@@ -534,9 +534,9 @@ static void ci_otg_loc_sof(struct otg_fsm *fsm, int on)
  * Start SRP pulsing by data-line pulsing,
  * no v-bus pulsing followed
  */
-static void ci_otg_start_pulse(struct otg_fsm *fsm)
+static void ci_otg_start_pulse(struct usb_otg *otg)
 {
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct ci_hdrc	*ci = container_of(otg, struct ci_hdrc, otg);
 
 	/* Hardware Assistant Data pulse */
 	hw_write_otgsc(ci, OTGSC_HADP, OTGSC_HADP);
@@ -545,9 +545,9 @@ static void ci_otg_start_pulse(struct otg_fsm *fsm)
 	ci_otg_add_timer(ci, B_DATA_PLS);
 }
 
-static int ci_otg_start_host(struct otg_fsm *fsm, int on)
+static int ci_otg_start_host(struct usb_otg *otg, int on)
 {
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct ci_hdrc	*ci = container_of(otg, struct ci_hdrc, otg);
 
 	if (on) {
 		ci_role_stop(ci);
@@ -559,9 +559,9 @@ static int ci_otg_start_host(struct otg_fsm *fsm, int on)
 	return 0;
 }
 
-static int ci_otg_start_gadget(struct otg_fsm *fsm, int on)
+static int ci_otg_start_gadget(struct usb_otg *otg, int on)
 {
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct ci_hdrc	*ci = container_of(otg, struct ci_hdrc, otg);
 
 	if (on)
 		usb_gadget_vbus_connect(&ci->gadget);
@@ -588,13 +588,13 @@ int ci_otg_fsm_work(struct ci_hdrc *ci)
 	 * Don't do fsm transition for B device
 	 * when there is no gadget class driver
 	 */
-	if (ci->fsm.id && !(ci->driver) &&
-		ci->fsm.otg->state < OTG_STATE_A_IDLE)
+	if (ci->otg.fsm.id && !(ci->driver) &&
+	    ci->otg.state < OTG_STATE_A_IDLE)
 		return 0;
 
 	pm_runtime_get_sync(ci->dev);
-	if (otg_statemachine(&ci->fsm)) {
-		if (ci->fsm.otg->state == OTG_STATE_A_IDLE) {
+	if (otg_statemachine(&ci->otg)) {
+		if (ci->otg.state == OTG_STATE_A_IDLE) {
 			/*
 			 * Further state change for cases:
 			 * a_idle to b_idle; or
@@ -603,8 +603,8 @@ int ci_otg_fsm_work(struct ci_hdrc *ci)
 			 * consequently; or
 			 * a_idle to a_wait_vrise when power up
 			 */
-			if ((ci->fsm.id) || (ci->id_event) ||
-						(ci->fsm.power_up)) {
+			if ((ci->otg.fsm.id) || (ci->id_event) ||
+			    (ci->otg.fsm.power_up)) {
 				ci_otg_queue_work(ci);
 			} else {
 				/* Enable data pulse irq */
@@ -615,16 +615,16 @@ int ci_otg_fsm_work(struct ci_hdrc *ci)
 			}
 			if (ci->id_event)
 				ci->id_event = false;
-		} else if (ci->fsm.otg->state == OTG_STATE_B_IDLE) {
-			if (ci->fsm.b_sess_vld) {
-				ci->fsm.power_up = 0;
+		} else if (ci->otg.state == OTG_STATE_B_IDLE) {
+			if (ci->otg.fsm.b_sess_vld) {
+				ci->otg.fsm.power_up = 0;
 				/*
 				 * Further transite to b_periphearl state
 				 * when register gadget driver with vbus on
 				 */
 				ci_otg_queue_work(ci);
 			}
-		} else if (ci->fsm.otg->state == OTG_STATE_A_HOST) {
+		} else if (ci->otg.state == OTG_STATE_A_HOST) {
 			pm_runtime_mark_last_busy(ci->dev);
 			pm_runtime_put_autosuspend(ci->dev);
 			return 0;
@@ -641,13 +641,13 @@ int ci_otg_fsm_work(struct ci_hdrc *ci)
 static void ci_otg_fsm_event(struct ci_hdrc *ci)
 {
 	u32 intr_sts, otg_bsess_vld, port_conn;
-	struct otg_fsm *fsm = &ci->fsm;
+	struct otg_fsm *fsm = &ci->otg.fsm;
 
 	intr_sts = hw_read_intr_status(ci);
 	otg_bsess_vld = hw_read_otgsc(ci, OTGSC_BSV);
 	port_conn = hw_read(ci, OP_PORTSC, PORTSC_CCS);
 
-	switch (ci->fsm.otg->state) {
+	switch (ci->otg.state) {
 	case OTG_STATE_A_WAIT_BCON:
 		if (port_conn) {
 			fsm->b_conn = 1;
@@ -737,7 +737,7 @@ irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci)
 {
 	irqreturn_t retval =  IRQ_NONE;
 	u32 otgsc, otg_int_src = 0;
-	struct otg_fsm *fsm = &ci->fsm;
+	struct otg_fsm *fsm = &ci->otg.fsm;
 
 	otgsc = hw_read_otgsc(ci, ~0);
 	otg_int_src = otgsc & OTGSC_INT_STATUS_BITS & (otgsc >> 8);
@@ -800,17 +800,16 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
 		ci->otg.usb_phy = ci->usb_phy;
 
 	ci->otg.gadget = &ci->gadget;
-	ci->fsm.otg = &ci->otg;
-	ci->fsm.power_up = 1;
-	ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
-	ci->fsm.otg->state = OTG_STATE_UNDEFINED;
-	ci->fsm.ops = &ci_otg_ops;
+	ci->otg.fsm.power_up = 1;
+	ci->otg.fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
+	ci->otg.state = OTG_STATE_UNDEFINED;
+	ci->otg.fsm.ops = &ci_otg_ops;
 	ci->gadget.hnp_polling_support = 1;
-	ci->fsm.host_req_flag = devm_kzalloc(ci->dev, 1, GFP_KERNEL);
-	if (!ci->fsm.host_req_flag)
+	ci->otg.fsm.host_req_flag = devm_kzalloc(ci->dev, 1, GFP_KERNEL);
+	if (!ci->otg.fsm.host_req_flag)
 		return -ENOMEM;
 
-	mutex_init(&ci->fsm.lock);
+	mutex_init(&ci->otg.fsm.lock);
 
 	retval = ci_otg_init_timers(ci);
 	if (retval) {
@@ -830,10 +829,10 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
 	/* Enable A vbus valid irq */
 	hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE);
 
-	if (ci->fsm.id) {
-		ci->fsm.b_ssend_srp =
+	if (ci->otg.fsm.id) {
+		ci->otg.fsm.b_ssend_srp =
 			hw_read_otgsc(ci, OTGSC_BSV) ? 0 : 1;
-		ci->fsm.b_sess_vld =
+		ci->otg.fsm.b_sess_vld =
 			hw_read_otgsc(ci, OTGSC_BSV) ? 1 : 0;
 		/* Enable BSV irq */
 		hw_write_otgsc(ci, OTGSC_BSVIE, OTGSC_BSVIE);
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 065f5d9..7a6b0b5 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -20,6 +20,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
 #include <linux/usb/otg-fsm.h>
 #include <linux/usb/chipidea.h>
 
@@ -1739,7 +1740,7 @@ static int ci_udc_start(struct usb_gadget *gadget,
 	ci->driver = driver;
 
 	/* Start otg fsm for B-device */
-	if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
+	if (ci_otg_is_fsm_mode(ci) && ci->otg.fsm.id) {
 		ci_hdrc_otg_fsm_start(ci);
 		return retval;
 	}
@@ -1767,15 +1768,15 @@ static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
 	if (!ci_otg_is_fsm_mode(ci))
 		return;
 
-	mutex_lock(&ci->fsm.lock);
-	if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
-		ci->fsm.a_bidl_adis_tmout = 1;
+	mutex_lock(&ci->otg.fsm.lock);
+	if (ci->otg.state == OTG_STATE_A_PERIPHERAL) {
+		ci->otg.fsm.a_bidl_adis_tmout = 1;
 		ci_hdrc_otg_fsm_start(ci);
-	} else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
-		ci->fsm.protocol = PROTO_UNDEF;
-		ci->fsm.otg->state = OTG_STATE_UNDEFINED;
+	} else if (ci->otg.state == OTG_STATE_B_PERIPHERAL) {
+		ci->otg.fsm.protocol = PROTO_UNDEF;
+		ci->otg.state = OTG_STATE_UNDEFINED;
 	}
-	mutex_unlock(&ci->fsm.lock);
+	mutex_unlock(&ci->otg.fsm.lock);
 }
 
 /**
diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
index 199dee0..610b5bd6 100644
--- a/drivers/usb/common/usb-otg-fsm.c
+++ b/drivers/usb/common/usb-otg-fsm.c
@@ -40,6 +40,7 @@
 /* Change USB protocol when there is a protocol change */
 static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 {
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
 	int ret = 0;
 
 	if (fsm->protocol != protocol) {
@@ -47,17 +48,17 @@ static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 			fsm->protocol, protocol);
 		/* stop old protocol */
 		if (fsm->protocol == PROTO_HOST)
-			ret = otg_start_host(fsm, 0);
+			ret = otg_start_host(otg, 0);
 		else if (fsm->protocol == PROTO_GADGET)
-			ret = otg_start_gadget(fsm, 0);
+			ret = otg_start_gadget(otg, 0);
 		if (ret)
 			return ret;
 
 		/* start new protocol */
 		if (protocol == PROTO_HOST)
-			ret = otg_start_host(fsm, 1);
+			ret = otg_start_host(otg, 1);
 		else if (protocol == PROTO_GADGET)
-			ret = otg_start_gadget(fsm, 1);
+			ret = otg_start_gadget(otg, 1);
 		if (ret)
 			return ret;
 
@@ -71,9 +72,11 @@ static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 /* Called when leaving a state.  Do state clean up jobs here */
 static void otg_leave_state(struct otg_fsm *fsm, enum usb_otg_state old_state)
 {
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
+
 	switch (old_state) {
 	case OTG_STATE_B_IDLE:
-		otg_del_timer(fsm, B_SE0_SRP);
+		otg_del_timer(otg, B_SE0_SRP);
 		fsm->b_se0_srp = 0;
 		fsm->adp_sns = 0;
 		fsm->adp_prb = 0;
@@ -83,11 +86,11 @@ static void otg_leave_state(struct otg_fsm *fsm, enum usb_otg_state old_state)
 		fsm->b_srp_done = 0;
 		break;
 	case OTG_STATE_B_PERIPHERAL:
-		if (fsm->otg->gadget)
-			fsm->otg->gadget->host_request_flag = 0;
+		if (otg->gadget)
+			otg->gadget->host_request_flag = 0;
 		break;
 	case OTG_STATE_B_WAIT_ACON:
-		otg_del_timer(fsm, B_ASE0_BRST);
+		otg_del_timer(otg, B_ASE0_BRST);
 		fsm->b_ase0_brst_tmout = 0;
 		break;
 	case OTG_STATE_B_HOST:
@@ -96,31 +99,31 @@ static void otg_leave_state(struct otg_fsm *fsm, enum usb_otg_state old_state)
 		fsm->adp_prb = 0;
 		break;
 	case OTG_STATE_A_WAIT_VRISE:
-		otg_del_timer(fsm, A_WAIT_VRISE);
+		otg_del_timer(otg, A_WAIT_VRISE);
 		fsm->a_wait_vrise_tmout = 0;
 		break;
 	case OTG_STATE_A_WAIT_BCON:
-		otg_del_timer(fsm, A_WAIT_BCON);
+		otg_del_timer(otg, A_WAIT_BCON);
 		fsm->a_wait_bcon_tmout = 0;
 		break;
 	case OTG_STATE_A_HOST:
-		otg_del_timer(fsm, A_WAIT_ENUM);
+		otg_del_timer(otg, A_WAIT_ENUM);
 		break;
 	case OTG_STATE_A_SUSPEND:
-		otg_del_timer(fsm, A_AIDL_BDIS);
+		otg_del_timer(otg, A_AIDL_BDIS);
 		fsm->a_aidl_bdis_tmout = 0;
 		fsm->a_suspend_req_inf = 0;
 		break;
 	case OTG_STATE_A_PERIPHERAL:
-		otg_del_timer(fsm, A_BIDL_ADIS);
+		otg_del_timer(otg, A_BIDL_ADIS);
 		fsm->a_bidl_adis_tmout = 0;
-		if (fsm->otg->gadget)
-			fsm->otg->gadget->host_request_flag = 0;
+		if (otg->gadget)
+			otg->gadget->host_request_flag = 0;
 		break;
 	case OTG_STATE_A_WAIT_VFALL:
-		otg_del_timer(fsm, A_WAIT_VFALL);
+		otg_del_timer(otg, A_WAIT_VFALL);
 		fsm->a_wait_vfall_tmout = 0;
-		otg_del_timer(fsm, A_WAIT_VRISE);
+		otg_del_timer(otg, A_WAIT_VRISE);
 		break;
 	case OTG_STATE_A_VBUS_ERR:
 		break;
@@ -133,17 +136,18 @@ static void otg_hnp_polling_work(struct work_struct *work)
 {
 	struct otg_fsm *fsm = container_of(to_delayed_work(work),
 				struct otg_fsm, hnp_polling_work);
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
 	struct usb_device *udev;
-	enum usb_otg_state state = fsm->otg->state;
+	enum usb_otg_state state = otg->state;
 	u8 flag;
 	int retval;
 
 	if (state != OTG_STATE_A_HOST && state != OTG_STATE_B_HOST)
 		return;
 
-	udev = usb_hub_find_child(fsm->otg->host->root_hub, 1);
+	udev = usb_hub_find_child(otg->host->root_hub, 1);
 	if (!udev) {
-		dev_err(fsm->otg->host->controller,
+		dev_err(otg->host->controller,
 			"no usb dev connected, can't start HNP polling\n");
 		return;
 	}
@@ -178,7 +182,7 @@ static void otg_hnp_polling_work(struct work_struct *work)
 	/* Host request flag is set */
 	if (state == OTG_STATE_A_HOST) {
 		/* Set b_hnp_enable */
-		if (!fsm->otg->host->b_hnp_enable) {
+		if (!otg->host->b_hnp_enable) {
 			retval = usb_control_msg(udev,
 					usb_sndctrlpipe(udev, 0),
 					USB_REQ_SET_FEATURE, 0,
@@ -186,14 +190,14 @@ static void otg_hnp_polling_work(struct work_struct *work)
 					0, NULL, 0,
 					USB_CTRL_SET_TIMEOUT);
 			if (retval >= 0)
-				fsm->otg->host->b_hnp_enable = 1;
+				otg->host->b_hnp_enable = 1;
 		}
 		fsm->a_bus_req = 0;
 	} else if (state == OTG_STATE_B_HOST) {
 		fsm->b_bus_req = 0;
 	}
 
-	otg_statemachine(fsm);
+	otg_statemachine(otg);
 }
 
 static void otg_start_hnp_polling(struct otg_fsm *fsm)
@@ -213,133 +217,135 @@ static void otg_start_hnp_polling(struct otg_fsm *fsm)
 /* Called when entering a state */
 static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
 {
-	if (fsm->otg->state == new_state)
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
+
+	if (otg->state == new_state)
 		return 0;
 	VDBG("Set state: %s\n", usb_otg_state_string(new_state));
-	otg_leave_state(fsm, fsm->otg->state);
+	otg_leave_state(fsm, otg->state);
 	switch (new_state) {
 	case OTG_STATE_B_IDLE:
-		otg_drv_vbus(fsm, 0);
-		otg_chrg_vbus(fsm, 0);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_drv_vbus(otg, 0);
+		otg_chrg_vbus(otg, 0);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
 		/*
 		 * Driver is responsible for starting ADP probing
 		 * if ADP sensing times out.
 		 */
-		otg_start_adp_sns(fsm);
+		otg_start_adp_sns(otg);
 		otg_set_protocol(fsm, PROTO_UNDEF);
-		otg_add_timer(fsm, B_SE0_SRP);
+		otg_add_timer(otg, B_SE0_SRP);
 		break;
 	case OTG_STATE_B_SRP_INIT:
-		otg_start_pulse(fsm);
-		otg_loc_sof(fsm, 0);
+		otg_start_pulse(otg);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_UNDEF);
-		otg_add_timer(fsm, B_SRP_FAIL);
+		otg_add_timer(otg, B_SRP_FAIL);
 		break;
 	case OTG_STATE_B_PERIPHERAL:
-		otg_chrg_vbus(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_chrg_vbus(otg, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_GADGET);
-		otg_loc_conn(fsm, 1);
+		otg_loc_conn(otg, 1);
 		break;
 	case OTG_STATE_B_WAIT_ACON:
-		otg_chrg_vbus(fsm, 0);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_chrg_vbus(otg, 0);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_HOST);
-		otg_add_timer(fsm, B_ASE0_BRST);
+		otg_add_timer(otg, B_ASE0_BRST);
 		fsm->a_bus_suspend = 0;
 		break;
 	case OTG_STATE_B_HOST:
-		otg_chrg_vbus(fsm, 0);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 1);
+		otg_chrg_vbus(otg, 0);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 1);
 		otg_set_protocol(fsm, PROTO_HOST);
-		usb_bus_start_enum(fsm->otg->host,
-				fsm->otg->host->otg_port);
+		usb_bus_start_enum(otg->host, otg->host->otg_port);
 		otg_start_hnp_polling(fsm);
 		break;
 	case OTG_STATE_A_IDLE:
-		otg_drv_vbus(fsm, 0);
-		otg_chrg_vbus(fsm, 0);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
-		otg_start_adp_prb(fsm);
+		otg_drv_vbus(otg, 0);
+		otg_chrg_vbus(otg, 0);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
+		otg_start_adp_prb(otg);
 		otg_set_protocol(fsm, PROTO_HOST);
 		break;
 	case OTG_STATE_A_WAIT_VRISE:
-		otg_drv_vbus(fsm, 1);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_drv_vbus(otg, 1);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_HOST);
-		otg_add_timer(fsm, A_WAIT_VRISE);
+		otg_add_timer(otg, A_WAIT_VRISE);
 		break;
 	case OTG_STATE_A_WAIT_BCON:
-		otg_drv_vbus(fsm, 1);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_drv_vbus(otg, 1);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_HOST);
-		otg_add_timer(fsm, A_WAIT_BCON);
+		otg_add_timer(otg, A_WAIT_BCON);
 		break;
 	case OTG_STATE_A_HOST:
-		otg_drv_vbus(fsm, 1);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 1);
+		otg_drv_vbus(otg, 1);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 1);
 		otg_set_protocol(fsm, PROTO_HOST);
 		/*
 		 * When HNP is triggered while a_bus_req = 0, a_host will
 		 * suspend too fast to complete a_set_b_hnp_en
 		 */
 		if (!fsm->a_bus_req || fsm->a_suspend_req_inf)
-			otg_add_timer(fsm, A_WAIT_ENUM);
+			otg_add_timer(otg, A_WAIT_ENUM);
 		otg_start_hnp_polling(fsm);
 		break;
 	case OTG_STATE_A_SUSPEND:
-		otg_drv_vbus(fsm, 1);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_drv_vbus(otg, 1);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_HOST);
-		otg_add_timer(fsm, A_AIDL_BDIS);
+		otg_add_timer(otg, A_AIDL_BDIS);
 
 		break;
 	case OTG_STATE_A_PERIPHERAL:
-		otg_loc_sof(fsm, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_GADGET);
-		otg_drv_vbus(fsm, 1);
-		otg_loc_conn(fsm, 1);
-		otg_add_timer(fsm, A_BIDL_ADIS);
+		otg_drv_vbus(otg, 1);
+		otg_loc_conn(otg, 1);
+		otg_add_timer(otg, A_BIDL_ADIS);
 		break;
 	case OTG_STATE_A_WAIT_VFALL:
-		otg_drv_vbus(fsm, 0);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_drv_vbus(otg, 0);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_HOST);
-		otg_add_timer(fsm, A_WAIT_VFALL);
+		otg_add_timer(otg, A_WAIT_VFALL);
 		break;
 	case OTG_STATE_A_VBUS_ERR:
-		otg_drv_vbus(fsm, 0);
-		otg_loc_conn(fsm, 0);
-		otg_loc_sof(fsm, 0);
+		otg_drv_vbus(otg, 0);
+		otg_loc_conn(otg, 0);
+		otg_loc_sof(otg, 0);
 		otg_set_protocol(fsm, PROTO_UNDEF);
 		break;
 	default:
 		break;
 	}
 
-	fsm->otg->state = new_state;
+	otg->state = new_state;
 	fsm->state_changed = 1;
 	return 0;
 }
 
 /* State change judgement */
-int otg_statemachine(struct otg_fsm *fsm)
+int otg_statemachine(struct usb_otg *otg)
 {
 	enum usb_otg_state state;
+	struct otg_fsm *fsm = &otg->fsm;
 
 	mutex_lock(&fsm->lock);
 
-	state = fsm->otg->state;
+	state = otg->state;
 	fsm->state_changed = 0;
 	/* State machine state change judgement */
 
@@ -354,7 +360,7 @@ int otg_statemachine(struct otg_fsm *fsm)
 	case OTG_STATE_B_IDLE:
 		if (!fsm->id)
 			otg_set_state(fsm, OTG_STATE_A_IDLE);
-		else if (fsm->b_sess_vld && fsm->otg->gadget)
+		else if (fsm->b_sess_vld && otg->gadget)
 			otg_set_state(fsm, OTG_STATE_B_PERIPHERAL);
 		else if ((fsm->b_bus_req || fsm->adp_change || fsm->power_up) &&
 				fsm->b_ssend_srp && fsm->b_se0_srp)
@@ -367,8 +373,8 @@ int otg_statemachine(struct otg_fsm *fsm)
 	case OTG_STATE_B_PERIPHERAL:
 		if (!fsm->id || !fsm->b_sess_vld)
 			otg_set_state(fsm, OTG_STATE_B_IDLE);
-		else if (fsm->b_bus_req && fsm->otg->
-				gadget->b_hnp_enable && fsm->a_bus_suspend)
+		else if (fsm->b_bus_req && otg->gadget->b_hnp_enable &&
+			 fsm->a_bus_suspend)
 			otg_set_state(fsm, OTG_STATE_B_WAIT_ACON);
 		break;
 	case OTG_STATE_B_WAIT_ACON:
@@ -413,7 +419,7 @@ int otg_statemachine(struct otg_fsm *fsm)
 		if (fsm->id || fsm->a_bus_drop)
 			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
 		else if ((!fsm->a_bus_req || fsm->a_suspend_req_inf) &&
-				fsm->otg->host->b_hnp_enable)
+			 otg->host->b_hnp_enable)
 			otg_set_state(fsm, OTG_STATE_A_SUSPEND);
 		else if (!fsm->b_conn)
 			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
@@ -421,9 +427,9 @@ int otg_statemachine(struct otg_fsm *fsm)
 			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
 		break;
 	case OTG_STATE_A_SUSPEND:
-		if (!fsm->b_conn && fsm->otg->host->b_hnp_enable)
+		if (!fsm->b_conn && otg->host->b_hnp_enable)
 			otg_set_state(fsm, OTG_STATE_A_PERIPHERAL);
-		else if (!fsm->b_conn && !fsm->otg->host->b_hnp_enable)
+		else if (!fsm->b_conn && !otg->host->b_hnp_enable)
 			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
 		else if (fsm->a_bus_req || fsm->b_bus_resume)
 			otg_set_state(fsm, OTG_STATE_A_HOST);
diff --git a/drivers/usb/phy/phy-fsl-usb.c b/drivers/usb/phy/phy-fsl-usb.c
index a8784ec..3ffa4c6 100644
--- a/drivers/usb/phy/phy-fsl-usb.c
+++ b/drivers/usb/phy/phy-fsl-usb.c
@@ -127,7 +127,7 @@ int write_ulpi(u8 addr, u8 data)
 /* Operations that will be called from OTG Finite State Machine */
 
 /* Charge vbus for vbus pulsing in SRP */
-void fsl_otg_chrg_vbus(struct otg_fsm *fsm, int on)
+void fsl_otg_chrg_vbus(struct usb_otg *otg, int on)
 {
 	u32 tmp;
 
@@ -163,7 +163,7 @@ void fsl_otg_dischrg_vbus(int on)
 }
 
 /* A-device driver vbus, controlled through PP bit in PORTSC */
-void fsl_otg_drv_vbus(struct otg_fsm *fsm, int on)
+void fsl_otg_drv_vbus(struct usb_otg *otg, int on)
 {
 	u32 tmp;
 
@@ -181,7 +181,7 @@ void fsl_otg_drv_vbus(struct otg_fsm *fsm, int on)
  * Pull-up D+, signalling connect by periperal. Also used in
  * data-line pulsing in SRP
  */
-void fsl_otg_loc_conn(struct otg_fsm *fsm, int on)
+void fsl_otg_loc_conn(struct usb_otg *otg, int on)
 {
 	u32 tmp;
 
@@ -200,7 +200,7 @@ void fsl_otg_loc_conn(struct otg_fsm *fsm, int on)
  * port.  In host mode, controller will automatically send SOF.
  * Suspend will block the data on the port.
  */
-void fsl_otg_loc_sof(struct otg_fsm *fsm, int on)
+void fsl_otg_loc_sof(struct usb_otg *otg, int on)
 {
 	u32 tmp;
 
@@ -215,7 +215,7 @@ void fsl_otg_loc_sof(struct otg_fsm *fsm, int on)
 }
 
 /* Start SRP pulsing by data-line pulsing, followed with v-bus pulsing. */
-void fsl_otg_start_pulse(struct otg_fsm *fsm)
+void fsl_otg_start_pulse(struct usb_otg *otg)
 {
 	u32 tmp;
 
@@ -228,7 +228,7 @@ void fsl_otg_start_pulse(struct otg_fsm *fsm)
 	fsl_otg_loc_conn(1);
 #endif
 
-	fsl_otg_add_timer(fsm, b_data_pulse_tmr);
+	fsl_otg_add_timer(&otg->fsm, b_data_pulse_tmr);
 }
 
 void b_data_pulse_end(unsigned long foo)
@@ -245,14 +245,14 @@ void b_data_pulse_end(unsigned long foo)
 void fsl_otg_pulse_vbus(void)
 {
 	srp_wait_done = 0;
-	fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 1);
+	fsl_otg_chrg_vbus(&fsl_otg_dev->otg, 1);
 	/* start the timer to end vbus charge */
-	fsl_otg_add_timer(&fsl_otg_dev->fsm, b_vbus_pulse_tmr);
+	fsl_otg_add_timer(&fsl_otg_dev->otg.fsm, b_vbus_pulse_tmr);
 }
 
 void b_vbus_pulse_end(unsigned long foo)
 {
-	fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 0);
+	fsl_otg_chrg_vbus(&fsl_otg_dev->otg, 0);
 
 	/*
 	 * As USB3300 using the same a_sess_vld and b_sess_vld voltage
@@ -260,7 +260,7 @@ void b_vbus_pulse_end(unsigned long foo)
 	 * residual voltage of vbus pulsing and A device pull up
 	 */
 	fsl_otg_dischrg_vbus(1);
-	fsl_otg_add_timer(&fsl_otg_dev->fsm, b_srp_wait_tmr);
+	fsl_otg_add_timer(&fsl_otg_dev->otg.fsm, b_srp_wait_tmr);
 }
 
 void b_srp_end(unsigned long foo)
@@ -269,8 +269,8 @@ void b_srp_end(unsigned long foo)
 	srp_wait_done = 1;
 
 	if ((fsl_otg_dev->phy.otg->state == OTG_STATE_B_SRP_INIT) &&
-	    fsl_otg_dev->fsm.b_sess_vld)
-		fsl_otg_dev->fsm.b_srp_done = 1;
+	    fsl_otg_dev->otg.fsm.b_sess_vld)
+		fsl_otg_dev->otg.fsm.b_srp_done = 1;
 }
 
 /*
@@ -282,9 +282,9 @@ void a_wait_enum(unsigned long foo)
 {
 	VDBG("a_wait_enum timeout\n");
 	if (!fsl_otg_dev->phy.otg->host->b_hnp_enable)
-		fsl_otg_add_timer(&fsl_otg_dev->fsm, a_wait_enum_tmr);
+		fsl_otg_add_timer(&fsl_otg_dev->otg.fsm, a_wait_enum_tmr);
 	else
-		otg_statemachine(&fsl_otg_dev->fsm);
+		otg_statemachine(&fsl_otg_dev->otg);
 }
 
 /* The timeout callback function to set time out bit */
@@ -421,7 +421,7 @@ void fsl_otg_add_timer(struct otg_fsm *fsm, void *gtimer)
 	list_add_tail(&timer->list, &active_timers);
 }
 
-static void fsl_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
+static void fsl_otg_fsm_add_timer(struct usb_otg *otg, enum otg_fsm_timer t)
 {
 	struct fsl_otg_timer *timer;
 
@@ -429,7 +429,7 @@ static void fsl_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
 	if (!timer)
 		return;
 
-	fsl_otg_add_timer(fsm, timer);
+	fsl_otg_add_timer(&otg->fsm, timer);
 }
 
 /* Remove timer from the timer list; clear timeout status */
@@ -443,7 +443,7 @@ void fsl_otg_del_timer(struct otg_fsm *fsm, void *gtimer)
 			list_del(&timer->list);
 }
 
-static void fsl_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
+static void fsl_otg_fsm_del_timer(struct usb_otg *otg, enum otg_fsm_timer t)
 {
 	struct fsl_otg_timer *timer;
 
@@ -451,7 +451,7 @@ static void fsl_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
 	if (!timer)
 		return;
 
-	fsl_otg_del_timer(fsm, timer);
+	fsl_otg_del_timer(&otg->fsm, timer);
 }
 
 /* Reset controller, not reset the bus */
@@ -467,9 +467,9 @@ void otg_reset_controller(void)
 }
 
 /* Call suspend/resume routines in host driver */
-int fsl_otg_start_host(struct otg_fsm *fsm, int on)
+int fsl_otg_start_host(struct usb_otg *otg, int on)
 {
-	struct usb_otg *otg = fsm->otg;
+	struct otg_fsm *fsm = &otg->fsm;
 	struct device *dev;
 	struct fsl_otg *otg_dev =
 		container_of(otg->usb_phy, struct fsl_otg, phy);
@@ -496,7 +496,7 @@ int fsl_otg_start_host(struct otg_fsm *fsm, int on)
 				retval = dev->driver->pm->resume(dev);
 				if (fsm->id) {
 					/* default-b */
-					fsl_otg_drv_vbus(fsm, 1);
+					fsl_otg_drv_vbus(otg, 1);
 					/*
 					 * Workaround: b_host can't driver
 					 * vbus, but PP in PORTSC needs to
@@ -521,7 +521,7 @@ int fsl_otg_start_host(struct otg_fsm *fsm, int on)
 					retval = dev->driver->pm->suspend(dev);
 				if (fsm->id)
 					/* default-b */
-					fsl_otg_drv_vbus(fsm, 0);
+					fsl_otg_drv_vbus(otg, 0);
 			}
 			otg_dev->host_working = 0;
 		}
@@ -534,9 +534,8 @@ end:
  * Call suspend and resume function in udc driver
  * to stop and start udc driver.
  */
-int fsl_otg_start_gadget(struct otg_fsm *fsm, int on)
+int fsl_otg_start_gadget(struct usb_otg *otg, int on)
 {
-	struct usb_otg *otg = fsm->otg;
 	struct device *dev;
 
 	if (!otg->gadget || !otg->gadget->dev.parent)
@@ -573,14 +572,14 @@ static int fsl_otg_set_host(struct usb_otg *otg, struct usb_bus *host)
 
 	otg->host = host;
 
-	otg_dev->fsm.a_bus_drop = 0;
-	otg_dev->fsm.a_bus_req = 1;
+	otg->fsm.a_bus_drop = 0;
+	otg->fsm.a_bus_req = 1;
 
 	if (host) {
 		VDBG("host off......\n");
 
 		otg->host->otg_port = fsl_otg_initdata.otg_port;
-		otg->host->is_b_host = otg_dev->fsm.id;
+		otg->host->is_b_host = otg->fsm.id;
 		/*
 		 * must leave time for hub_wq to finish its thing
 		 * before yanking the host driver out from under it,
@@ -594,7 +593,7 @@ static int fsl_otg_set_host(struct usb_otg *otg, struct usb_bus *host)
 		if (!(fsl_readl(&otg_dev->dr_mem_map->otgsc) &
 		      OTGSC_STS_USB_ID)) {
 			/* Mini-A cable connected */
-			struct otg_fsm *fsm = &otg_dev->fsm;
+			struct otg_fsm *fsm = &otg->fsm;
 
 			otg->state = OTG_STATE_UNDEFINED;
 			fsm->protocol = PROTO_UNDEF;
@@ -603,7 +602,7 @@ static int fsl_otg_set_host(struct usb_otg *otg, struct usb_bus *host)
 
 	otg_dev->host_working = 0;
 
-	otg_statemachine(&otg_dev->fsm);
+	otg_statemachine(otg);
 
 	return 0;
 }
@@ -628,22 +627,22 @@ static int fsl_otg_set_peripheral(struct usb_otg *otg,
 			otg->gadget->ops->vbus_draw(otg->gadget, 0);
 		usb_gadget_vbus_disconnect(otg->gadget);
 		otg->gadget = 0;
-		otg_dev->fsm.b_bus_req = 0;
-		otg_statemachine(&otg_dev->fsm);
+		otg->fsm.b_bus_req = 0;
+		otg_statemachine(otg);
 		return 0;
 	}
 
 	otg->gadget = gadget;
-	otg->gadget->is_a_peripheral = !otg_dev->fsm.id;
+	otg->gadget->is_a_peripheral = !otg->fsm.id;
 
-	otg_dev->fsm.b_bus_req = 1;
+	otg->fsm.b_bus_req = 1;
 
 	/* start the gadget right away if the ID pin says Mini-B */
-	pr_debug("ID pin=%d\n", otg_dev->fsm.id);
-	if (otg_dev->fsm.id == 1) {
-		fsl_otg_start_host(&otg_dev->fsm, 0);
-		otg_drv_vbus(&otg_dev->fsm, 0);
-		fsl_otg_start_gadget(&otg_dev->fsm, 1);
+	pr_debug("ID pin=%d\n", otg->fsm.id);
+	if (otg->fsm.id == 1) {
+		fsl_otg_start_host(otg, 0);
+		otg_drv_vbus(otg, 0);
+		fsl_otg_start_gadget(otg, 1);
 	}
 
 	return 0;
@@ -672,13 +671,14 @@ static int fsl_otg_set_power(struct usb_phy *phy, unsigned mA)
  */
 static void fsl_otg_event(struct work_struct *work)
 {
-	struct fsl_otg *og = container_of(work, struct fsl_otg, otg_event.work);
-	struct otg_fsm *fsm = &og->fsm;
-
-	if (fsm->id) {		/* switch to gadget */
-		fsl_otg_start_host(fsm, 0);
-		otg_drv_vbus(fsm, 0);
-		fsl_otg_start_gadget(fsm, 1);
+	struct fsl_otg *fotg = container_of(work, struct fsl_otg,
+					    otg_event.work);
+	struct usb_otg *otg = &fotg->otg;
+
+	if (otg->fsm.id) {		/* switch to gadget */
+		fsl_otg_start_host(otg, 0);
+		otg_drv_vbus(otg, 0);
+		fsl_otg_start_gadget(otg, 1);
 	}
 }
 
@@ -694,8 +694,8 @@ static int fsl_otg_start_srp(struct usb_otg *otg)
 	if (otg_dev != fsl_otg_dev)
 		return -ENODEV;
 
-	otg_dev->fsm.b_bus_req = 1;
-	otg_statemachine(&otg_dev->fsm);
+	otg->fsm.b_bus_req = 1;
+	otg_statemachine(otg);
 
 	return 0;
 }
@@ -715,8 +715,8 @@ static int fsl_otg_start_hnp(struct usb_otg *otg)
 	pr_debug("start_hnp...\n");
 
 	/* clear a_bus_req to enter a_suspend state */
-	otg_dev->fsm.a_bus_req = 0;
-	otg_statemachine(&otg_dev->fsm);
+	otg->fsm.a_bus_req = 0;
+	otg_statemachine(otg);
 
 	return 0;
 }
@@ -729,8 +729,8 @@ static int fsl_otg_start_hnp(struct usb_otg *otg)
  */
 irqreturn_t fsl_otg_isr(int irq, void *dev_id)
 {
-	struct otg_fsm *fsm = &((struct fsl_otg *)dev_id)->fsm;
-	struct usb_otg *otg = ((struct fsl_otg *)dev_id)->phy.otg;
+	struct usb_otg *otg = &((struct fsl_otg *)dev_id)->otg;
+	struct otg_fsm *fsm = &otg->fsm;
 	u32 otg_int_src, otg_sc;
 
 	otg_sc = fsl_readl(&usb_dr_regs->otgsc);
@@ -768,9 +768,9 @@ irqreturn_t fsl_otg_isr(int irq, void *dev_id)
 				cancel_delayed_work(&
 						    ((struct fsl_otg *)dev_id)->
 						    otg_event);
-				fsl_otg_start_gadget(fsm, 0);
-				otg_drv_vbus(fsm, 1);
-				fsl_otg_start_host(fsm, 1);
+				fsl_otg_start_gadget(otg, 0);
+				otg_drv_vbus(otg, 1);
+				fsl_otg_start_host(otg, 1);
 			}
 			return IRQ_HANDLED;
 		}
@@ -806,24 +806,20 @@ static int fsl_otg_conf(struct platform_device *pdev)
 	if (!fsl_otg_tc)
 		return -ENOMEM;
 
-	fsl_otg_tc->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
-	if (!fsl_otg_tc->phy.otg) {
-		kfree(fsl_otg_tc);
-		return -ENOMEM;
-	}
+	fsl_otg_tc->phy.otg = &fsl_otg_tc->otg;
 
 	INIT_DELAYED_WORK(&fsl_otg_tc->otg_event, fsl_otg_event);
 
 	INIT_LIST_HEAD(&active_timers);
-	status = fsl_otg_init_timers(&fsl_otg_tc->fsm);
+	status = fsl_otg_init_timers(&fsl_otg_tc->otg.fsm);
 	if (status) {
 		pr_info("Couldn't init OTG timers\n");
 		goto err;
 	}
-	mutex_init(&fsl_otg_tc->fsm.lock);
+	mutex_init(&fsl_otg_tc->otg.fsm.lock);
 
 	/* Set OTG state machine operations */
-	fsl_otg_tc->fsm.ops = &fsl_otg_ops;
+	fsl_otg_tc->otg.fsm.ops = &fsl_otg_ops;
 
 	/* initialize the otg structure */
 	fsl_otg_tc->phy.label = DRIVER_DESC;
@@ -858,18 +854,15 @@ int usb_otg_start(struct platform_device *pdev)
 {
 	struct fsl_otg *p_otg;
 	struct usb_phy *otg_trans = usb_get_phy(USB_PHY_TYPE_USB2);
-	struct otg_fsm *fsm;
 	int status;
 	struct resource *res;
 	u32 temp;
 	struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
 
 	p_otg = container_of(otg_trans, struct fsl_otg, phy);
-	fsm = &p_otg->fsm;
 
 	/* Initialize the state machine structure with default values */
 	SET_OTG_STATE(otg_trans, OTG_STATE_UNDEFINED);
-	fsm->otg = p_otg->phy.otg;
 
 	/* We don't require predefined MEM/IRQ resource index */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -963,13 +956,13 @@ int usb_otg_start(struct platform_device *pdev)
 	 */
 	if (fsl_readl(&p_otg->dr_mem_map->otgsc) & OTGSC_STS_USB_ID) {
 		p_otg->phy.otg->state = OTG_STATE_UNDEFINED;
-		p_otg->fsm.id = 1;
+		p_otg->otg.fsm.id = 1;
 	} else {
 		p_otg->phy.otg->state = OTG_STATE_A_IDLE;
-		p_otg->fsm.id = 0;
+		p_otg->otg.fsm.id = 0;
 	}
 
-	pr_debug("initial ID pin=%d\n", p_otg->fsm.id);
+	pr_debug("initial ID pin=%d\n", p_otg->otg.fsm.id);
 
 	/* enable OTG ID pin interrupt */
 	temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
@@ -986,7 +979,7 @@ int usb_otg_start(struct platform_device *pdev)
 static int show_fsl_usb2_otg_state(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
-	struct otg_fsm *fsm = &fsl_otg_dev->fsm;
+	struct otg_fsm *fsm = &fsl_otg_dev->otg.fsm;
 	char *next = buf;
 	unsigned size = PAGE_SIZE;
 	int t;
@@ -1084,26 +1077,26 @@ static long fsl_otg_ioctl(struct file *file, unsigned int cmd,
 		break;
 
 	case SET_A_SUSPEND_REQ:
-		fsl_otg_dev->fsm.a_suspend_req_inf = arg;
+		fsl_otg_dev->otg.fsm.a_suspend_req_inf = arg;
 		break;
 
 	case SET_A_BUS_DROP:
-		fsl_otg_dev->fsm.a_bus_drop = arg;
+		fsl_otg_dev->otg.fsm.a_bus_drop = arg;
 		break;
 
 	case SET_A_BUS_REQ:
-		fsl_otg_dev->fsm.a_bus_req = arg;
+		fsl_otg_dev->otg.fsm.a_bus_req = arg;
 		break;
 
 	case SET_B_BUS_REQ:
-		fsl_otg_dev->fsm.b_bus_req = arg;
+		fsl_otg_dev->otg.fsm.b_bus_req = arg;
 		break;
 
 	default:
 		break;
 	}
 
-	otg_statemachine(&fsl_otg_dev->fsm);
+	otg_statemachine(&fsl_otg_dev->otg);
 
 	return retval;
 }
diff --git a/drivers/usb/phy/phy-fsl-usb.h b/drivers/usb/phy/phy-fsl-usb.h
index 2314995..e207cfb 100644
--- a/drivers/usb/phy/phy-fsl-usb.h
+++ b/drivers/usb/phy/phy-fsl-usb.h
@@ -15,7 +15,6 @@
  * 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include <linux/usb/otg-fsm.h>
 #include <linux/usb/otg.h>
 #include <linux/ioctl.h>
 
@@ -370,7 +369,7 @@ inline struct fsl_otg_timer *otg_timer_initializer
 
 struct fsl_otg {
 	struct usb_phy phy;
-	struct otg_fsm fsm;
+	struct usb_otg otg;
 	struct usb_dr_mmap *dr_mem_map;
 	struct delayed_work otg_event;
 
diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
index a0a8f87..26e6531 100644
--- a/include/linux/usb/otg-fsm.h
+++ b/include/linux/usb/otg-fsm.h
@@ -188,7 +188,6 @@ struct otg_fsm {
 	int a_bidl_adis_tmout;
 
 	struct otg_fsm_ops *ops;
-	struct usb_otg *otg;
 
 	/* Current usb protocol used: 0:undefine; 1:host; 2:client */
 	int protocol;
@@ -198,126 +197,23 @@ struct otg_fsm {
 	bool state_changed;
 };
 
+struct usb_otg;
+
 struct otg_fsm_ops {
-	void	(*chrg_vbus)(struct otg_fsm *fsm, int on);
-	void	(*drv_vbus)(struct otg_fsm *fsm, int on);
-	void	(*loc_conn)(struct otg_fsm *fsm, int on);
-	void	(*loc_sof)(struct otg_fsm *fsm, int on);
-	void	(*start_pulse)(struct otg_fsm *fsm);
-	void	(*start_adp_prb)(struct otg_fsm *fsm);
-	void	(*start_adp_sns)(struct otg_fsm *fsm);
-	void	(*add_timer)(struct otg_fsm *fsm, enum otg_fsm_timer timer);
-	void	(*del_timer)(struct otg_fsm *fsm, enum otg_fsm_timer timer);
-	int	(*start_host)(struct otg_fsm *fsm, int on);
-	int	(*start_gadget)(struct otg_fsm *fsm, int on);
+	void	(*chrg_vbus)(struct usb_otg *otg, int on);
+	void	(*drv_vbus)(struct usb_otg *otg, int on);
+	void	(*loc_conn)(struct usb_otg *otg, int on);
+	void	(*loc_sof)(struct usb_otg *otg, int on);
+	void	(*start_pulse)(struct usb_otg *otg);
+	void	(*start_adp_prb)(struct usb_otg *otg);
+	void	(*start_adp_sns)(struct usb_otg *otg);
+	void	(*add_timer)(struct usb_otg *otg, enum otg_fsm_timer timer);
+	void	(*del_timer)(struct usb_otg *otg, enum otg_fsm_timer timer);
+	int	(*start_host)(struct usb_otg *otg, int on);
+	int	(*start_gadget)(struct usb_otg *otg, int on);
 };
 
 
-static inline int otg_chrg_vbus(struct otg_fsm *fsm, int on)
-{
-	if (!fsm->ops->chrg_vbus)
-		return -EOPNOTSUPP;
-	fsm->ops->chrg_vbus(fsm, on);
-	return 0;
-}
-
-static inline int otg_drv_vbus(struct otg_fsm *fsm, int on)
-{
-	if (!fsm->ops->drv_vbus)
-		return -EOPNOTSUPP;
-	if (fsm->drv_vbus != on) {
-		fsm->drv_vbus = on;
-		fsm->ops->drv_vbus(fsm, on);
-	}
-	return 0;
-}
-
-static inline int otg_loc_conn(struct otg_fsm *fsm, int on)
-{
-	if (!fsm->ops->loc_conn)
-		return -EOPNOTSUPP;
-	if (fsm->loc_conn != on) {
-		fsm->loc_conn = on;
-		fsm->ops->loc_conn(fsm, on);
-	}
-	return 0;
-}
-
-static inline int otg_loc_sof(struct otg_fsm *fsm, int on)
-{
-	if (!fsm->ops->loc_sof)
-		return -EOPNOTSUPP;
-	if (fsm->loc_sof != on) {
-		fsm->loc_sof = on;
-		fsm->ops->loc_sof(fsm, on);
-	}
-	return 0;
-}
-
-static inline int otg_start_pulse(struct otg_fsm *fsm)
-{
-	if (!fsm->ops->start_pulse)
-		return -EOPNOTSUPP;
-	if (!fsm->data_pulse) {
-		fsm->data_pulse = 1;
-		fsm->ops->start_pulse(fsm);
-	}
-	return 0;
-}
-
-static inline int otg_start_adp_prb(struct otg_fsm *fsm)
-{
-	if (!fsm->ops->start_adp_prb)
-		return -EOPNOTSUPP;
-	if (!fsm->adp_prb) {
-		fsm->adp_sns = 0;
-		fsm->adp_prb = 1;
-		fsm->ops->start_adp_prb(fsm);
-	}
-	return 0;
-}
-
-static inline int otg_start_adp_sns(struct otg_fsm *fsm)
-{
-	if (!fsm->ops->start_adp_sns)
-		return -EOPNOTSUPP;
-	if (!fsm->adp_sns) {
-		fsm->adp_sns = 1;
-		fsm->ops->start_adp_sns(fsm);
-	}
-	return 0;
-}
-
-static inline int otg_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer timer)
-{
-	if (!fsm->ops->add_timer)
-		return -EOPNOTSUPP;
-	fsm->ops->add_timer(fsm, timer);
-	return 0;
-}
-
-static inline int otg_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer timer)
-{
-	if (!fsm->ops->del_timer)
-		return -EOPNOTSUPP;
-	fsm->ops->del_timer(fsm, timer);
-	return 0;
-}
-
-static inline int otg_start_host(struct otg_fsm *fsm, int on)
-{
-	if (!fsm->ops->start_host)
-		return -EOPNOTSUPP;
-	return fsm->ops->start_host(fsm, on);
-}
-
-static inline int otg_start_gadget(struct otg_fsm *fsm, int on)
-{
-	if (!fsm->ops->start_gadget)
-		return -EOPNOTSUPP;
-	return fsm->ops->start_gadget(fsm, on);
-}
-
-int otg_statemachine(struct otg_fsm *fsm);
+int otg_statemachine(struct usb_otg *otg);
 
 #endif /* __LINUX_USB_OTG_FSM_H */
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 67929df..e8a14dc 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -11,6 +11,7 @@
 
 #include <linux/phy/phy.h>
 #include <linux/usb/phy.h>
+#include <linux/usb/otg-fsm.h>
 
 struct usb_otg {
 	u8			default_a;
@@ -22,6 +23,7 @@ struct usb_otg {
 	struct usb_gadget	*gadget;
 
 	enum usb_otg_state	state;
+	struct otg_fsm fsm;
 
 	/* bind/unbind the host controller */
 	int	(*set_host)(struct usb_otg *otg, struct usb_bus *host);
@@ -128,4 +130,109 @@ enum usb_dr_mode {
  */
 extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
 
+static inline int otg_chrg_vbus(struct usb_otg *otg, int on)
+{
+	if (!otg->fsm.ops->chrg_vbus)
+		return -EOPNOTSUPP;
+	otg->fsm.ops->chrg_vbus(otg, on);
+	return 0;
+}
+
+static inline int otg_drv_vbus(struct usb_otg *otg, int on)
+{
+	if (!otg->fsm.ops->drv_vbus)
+		return -EOPNOTSUPP;
+	if (otg->fsm.drv_vbus != on) {
+		otg->fsm.drv_vbus = on;
+		otg->fsm.ops->drv_vbus(otg, on);
+	}
+	return 0;
+}
+
+static inline int otg_loc_conn(struct usb_otg *otg, int on)
+{
+	if (!otg->fsm.ops->loc_conn)
+		return -EOPNOTSUPP;
+	if (otg->fsm.loc_conn != on) {
+		otg->fsm.loc_conn = on;
+		otg->fsm.ops->loc_conn(otg, on);
+	}
+	return 0;
+}
+
+static inline int otg_loc_sof(struct usb_otg *otg, int on)
+{
+	if (!otg->fsm.ops->loc_sof)
+		return -EOPNOTSUPP;
+	if (otg->fsm.loc_sof != on) {
+		otg->fsm.loc_sof = on;
+		otg->fsm.ops->loc_sof(otg, on);
+	}
+	return 0;
+}
+
+static inline int otg_start_pulse(struct usb_otg *otg)
+{
+	if (!otg->fsm.ops->start_pulse)
+		return -EOPNOTSUPP;
+	if (!otg->fsm.data_pulse) {
+		otg->fsm.data_pulse = 1;
+		otg->fsm.ops->start_pulse(otg);
+	}
+	return 0;
+}
+
+static inline int otg_start_adp_prb(struct usb_otg *otg)
+{
+	if (!otg->fsm.ops->start_adp_prb)
+		return -EOPNOTSUPP;
+	if (!otg->fsm.adp_prb) {
+		otg->fsm.adp_sns = 0;
+		otg->fsm.adp_prb = 1;
+		otg->fsm.ops->start_adp_prb(otg);
+	}
+	return 0;
+}
+
+static inline int otg_start_adp_sns(struct usb_otg *otg)
+{
+	if (!otg->fsm.ops->start_adp_sns)
+		return -EOPNOTSUPP;
+	if (!otg->fsm.adp_sns) {
+		otg->fsm.adp_sns = 1;
+		otg->fsm.ops->start_adp_sns(otg);
+	}
+	return 0;
+}
+
+static inline int otg_add_timer(struct usb_otg *otg, enum otg_fsm_timer timer)
+{
+	if (!otg->fsm.ops->add_timer)
+		return -EOPNOTSUPP;
+	otg->fsm.ops->add_timer(otg, timer);
+	return 0;
+}
+
+static inline int otg_del_timer(struct usb_otg *otg, enum otg_fsm_timer timer)
+{
+	if (!otg->fsm.ops->del_timer)
+		return -EOPNOTSUPP;
+	otg->fsm.ops->del_timer(otg, timer);
+	return 0;
+}
+
+static inline int otg_start_host(struct usb_otg *otg, int on)
+{
+	if (!otg->fsm.ops->start_host)
+		return -EOPNOTSUPP;
+	return otg->fsm.ops->start_host(otg, on);
+}
+
+static inline int otg_start_gadget(struct usb_otg *otg, int on)
+{
+	if (!otg->fsm.ops->start_gadget)
+		return -EOPNOTSUPP;
+	return otg->fsm.ops->start_gadget(otg, on);
+}
+
 #endif /* __LINUX_USB_OTG_H */
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (3 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
                   ` (9 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

This is to prevent missing symbol build error if OTG is
enabled (built-in) and HCD core (CONFIG_USB) is module.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/chipidea/otg_fsm.c   |  7 +++++++
 drivers/usb/common/usb-otg-fsm.c | 15 +++++++++++----
 drivers/usb/phy/phy-fsl-usb.c    |  7 +++++++
 include/linux/usb/otg.h          |  2 ++
 4 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
index 1c0c750..2d8d659 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -582,6 +582,12 @@ static struct otg_fsm_ops ci_otg_ops = {
 	.start_gadget = ci_otg_start_gadget,
 };
 
+static struct otg_hcd_ops ci_hcd_ops = {
+	.usb_bus_start_enum = usb_bus_start_enum,
+	.usb_control_msg = usb_control_msg,
+	.usb_hub_find_child = usb_hub_find_child,
+};
+
 int ci_otg_fsm_work(struct ci_hdrc *ci)
 {
 	/*
@@ -804,6 +810,7 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
 	ci->otg.fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
 	ci->otg.state = OTG_STATE_UNDEFINED;
 	ci->otg.fsm.ops = &ci_otg_ops;
+	ci->otg.hcd_ops = &ci_hcd_ops;
 	ci->gadget.hnp_polling_support = 1;
 	ci->otg.fsm.host_req_flag = devm_kzalloc(ci->dev, 1, GFP_KERNEL);
 	if (!ci->otg.fsm.host_req_flag)
diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
index 610b5bd6..482d4c9 100644
--- a/drivers/usb/common/usb-otg-fsm.c
+++ b/drivers/usb/common/usb-otg-fsm.c
@@ -141,11 +141,16 @@ static void otg_hnp_polling_work(struct work_struct *work)
 	enum usb_otg_state state = otg->state;
 	u8 flag;
 	int retval;
+	struct otg_hcd_ops *hcd_ops = otg->hcd_ops;
 
 	if (state != OTG_STATE_A_HOST && state != OTG_STATE_B_HOST)
 		return;
 
-	udev = usb_hub_find_child(otg->host->root_hub, 1);
+	if (!hcd_ops || !hcd_ops->usb_control_msg ||
+	    !hcd_ops->usb_hub_find_child)
+		return;
+
+	udev = hcd_ops->usb_hub_find_child(otg->host->root_hub, 1);
 	if (!udev) {
 		dev_err(otg->host->controller,
 			"no usb dev connected, can't start HNP polling\n");
@@ -154,7 +159,7 @@ static void otg_hnp_polling_work(struct work_struct *work)
 
 	*fsm->host_req_flag = 0;
 	/* Get host request flag from connected USB device */
-	retval = usb_control_msg(udev,
+	retval = hcd_ops->usb_control_msg(udev,
 				usb_rcvctrlpipe(udev, 0),
 				USB_REQ_GET_STATUS,
 				USB_DIR_IN | USB_RECIP_DEVICE,
@@ -183,7 +188,7 @@ static void otg_hnp_polling_work(struct work_struct *work)
 	if (state == OTG_STATE_A_HOST) {
 		/* Set b_hnp_enable */
 		if (!otg->host->b_hnp_enable) {
-			retval = usb_control_msg(udev,
+			retval = hcd_ops->usb_control_msg(udev,
 					usb_sndctrlpipe(udev, 0),
 					USB_REQ_SET_FEATURE, 0,
 					USB_DEVICE_B_HNP_ENABLE,
@@ -262,7 +267,9 @@ static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
 		otg_loc_conn(otg, 0);
 		otg_loc_sof(otg, 1);
 		otg_set_protocol(fsm, PROTO_HOST);
-		usb_bus_start_enum(otg->host, otg->host->otg_port);
+		if (otg->hcd_ops && otg->hcd_ops->usb_bus_start_enum)
+			otg->hcd_ops->usb_bus_start_enum(otg->host,
+							 otg->host->otg_port);
 		otg_start_hnp_polling(fsm);
 		break;
 	case OTG_STATE_A_IDLE:
diff --git a/drivers/usb/phy/phy-fsl-usb.c b/drivers/usb/phy/phy-fsl-usb.c
index 3ffa4c6..011d36e 100644
--- a/drivers/usb/phy/phy-fsl-usb.c
+++ b/drivers/usb/phy/phy-fsl-usb.c
@@ -792,6 +792,12 @@ static struct otg_fsm_ops fsl_otg_ops = {
 	.start_gadget = fsl_otg_start_gadget,
 };
 
+static struct otg_hcd_ops fsl_hcd_ops = {
+	.usb_bus_start_enum = usb_bus_start_enum,
+	.usb_control_msg = usb_control_msg,
+	.usb_hub_find_child = usb_hub_find_child,
+};
+
 /* Initialize the global variable fsl_otg_dev and request IRQ for OTG */
 static int fsl_otg_conf(struct platform_device *pdev)
 {
@@ -820,6 +826,7 @@ static int fsl_otg_conf(struct platform_device *pdev)
 
 	/* Set OTG state machine operations */
 	fsl_otg_tc->otg.fsm.ops = &fsl_otg_ops;
+	fsl_otg_tc->otg.hcd_ops = &fsl_hcd_ops;
 
 	/* initialize the otg structure */
 	fsl_otg_tc->phy.label = DRIVER_DESC;
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index e8a14dc..85b8fb5 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -12,6 +12,7 @@
 #include <linux/phy/phy.h>
 #include <linux/usb/phy.h>
 #include <linux/usb/otg-fsm.h>
+#include <linux/usb/hcd.h>
 
 struct usb_otg {
 	u8			default_a;
@@ -24,6 +25,7 @@ struct usb_otg {
 
 	enum usb_otg_state	state;
 	struct otg_fsm fsm;
+	struct otg_hcd_ops	*hcd_ops;
 
 	/* bind/unbind the host controller */
 	int	(*set_host)(struct usb_otg *otg, struct usb_bus *host);
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 06/14] usb: gadget.h: Add OTG to gadget interface
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (4 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
                   ` (8 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

The OTG core will use struct otg_gadget_ops to
start/stop the gadget controller.

The main purpose of this interface is to avoid directly
calling usb_gadget_start/stop() from the OTG core as they
wouldn't be defined in the built-in symbol table if
CONFIG_USB_GADGET is m.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 include/linux/usb/gadget.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 457651b..51e3bde 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -1100,6 +1100,22 @@ struct usb_gadget_driver {
 };
 
 
+/*-------------------------------------------------------------------------*/
+
+/**
+ * struct otg_gadget_ops - Interface between OTG core and gadget
+ *
+ * Provided by the gadget core to allow the OTG core to start/stop the gadget
+ *
+ * @start: function to start the gadget
+ * @stop: function to stop the gadget
+ * @connect_control: function to connect/disconnect from the bus
+ */
+struct otg_gadget_ops {
+	int (*start)(struct usb_gadget *gadget);
+	int (*stop)(struct usb_gadget *gadget);
+	int (*connect_control)(struct usb_gadget *gadget, bool connect);
+};
 
 /*-------------------------------------------------------------------------*/
 
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (5 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 08/14] usb: otg: add OTG/dual-role core Roger Quadros
                   ` (7 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

Let's use CONFIG_USB_OTG as a single config option to enable
USB OTG and the OTG FSM. This makes things a lot less confusing.

Update all users of CONFIG_USB_OTG_FSM to CONFIG_USB_OTG.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 Documentation/usb/chipidea.txt | 2 +-
 drivers/usb/chipidea/Makefile  | 2 +-
 drivers/usb/chipidea/ci.h      | 2 +-
 drivers/usb/chipidea/otg_fsm.h | 2 +-
 drivers/usb/common/Makefile    | 3 ++-
 drivers/usb/core/Kconfig       | 8 --------
 drivers/usb/phy/Kconfig        | 2 +-
 7 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/Documentation/usb/chipidea.txt b/Documentation/usb/chipidea.txt
index edf7cdf..580d157 100644
--- a/Documentation/usb/chipidea.txt
+++ b/Documentation/usb/chipidea.txt
@@ -5,7 +5,7 @@ with 2 Freescale i.MX6Q sabre SD boards.
 
 1.1 How to enable OTG FSM
 ---------------------------------------
-1.1.1 Select CONFIG_USB_OTG_FSM in menuconfig, rebuild kernel
+1.1.1 Select CONFIG_USB_OTG in menuconfig, rebuild kernel
 Image and modules. If you want to check some internal
 variables for otg fsm, mount debugfs, there are 2 files
 which can show otg fsm variables and some controller registers value:
diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 518e445..45aa24d 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -3,7 +3,7 @@ obj-$(CONFIG_USB_CHIPIDEA)		+= ci_hdrc.o
 ci_hdrc-y				:= core.o otg.o debug.o
 ci_hdrc-$(CONFIG_USB_CHIPIDEA_UDC)	+= udc.o
 ci_hdrc-$(CONFIG_USB_CHIPIDEA_HOST)	+= host.o
-ci_hdrc-$(CONFIG_USB_OTG_FSM)		+= otg_fsm.o
+ci_hdrc-$(CONFIG_USB_OTG)		+= otg_fsm.o
 
 # Glue/Bridge layers go here
 
diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index c523975..1a32b8c 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -406,7 +406,7 @@ static inline u32 hw_test_and_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
  */
 static inline bool ci_otg_is_fsm_mode(struct ci_hdrc *ci)
 {
-#ifdef CONFIG_USB_OTG_FSM
+#ifdef CONFIG_USB_OTG
 	struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
 
 	return ci->is_otg && ci->roles[CI_ROLE_HOST] &&
diff --git a/drivers/usb/chipidea/otg_fsm.h b/drivers/usb/chipidea/otg_fsm.h
index 6366fe3..2d451bb 100644
--- a/drivers/usb/chipidea/otg_fsm.h
+++ b/drivers/usb/chipidea/otg_fsm.h
@@ -64,7 +64,7 @@
 
 #define TB_AIDL_BDIS         (20)	/* 4ms ~ 150ms, section 5.2.1 */
 
-#if IS_ENABLED(CONFIG_USB_OTG_FSM)
+#if IS_ENABLED(CONFIG_USB_OTG)
 
 int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci);
 int ci_otg_fsm_work(struct ci_hdrc *ci);
diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
index 6bbb3ec..f8f2c88 100644
--- a/drivers/usb/common/Makefile
+++ b/drivers/usb/common/Makefile
@@ -6,5 +6,6 @@ obj-$(CONFIG_USB_COMMON)	  += usb-common.o
 usb-common-y			  += common.o
 usb-common-$(CONFIG_USB_LED_TRIG) += led.o
 
-obj-$(CONFIG_USB_OTG_FSM) += usb-otg-fsm.o
 obj-$(CONFIG_USB_ULPI_BUS)	+= ulpi.o
+usbotg-y		:= usb-otg-fsm.o
+obj-$(CONFIG_USB_OTG)	+= usbotg.o
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index dd28010..ae228d0 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -75,14 +75,6 @@ config USB_OTG_BLACKLIST_HUB
 	  and software costs by not supporting external hubs.  So
 	  are "Embedded Hosts" that don't offer OTG support.
 
-config USB_OTG_FSM
-	tristate "USB 2.0 OTG FSM implementation"
-	depends on USB && USB_OTG
-	select USB_PHY
-	help
-	  Implements OTG Finite State Machine as specified in On-The-Go
-	  and Embedded Host Supplement to the USB Revision 2.0 Specification.
-
 config USB_ULPI_BUS
 	tristate "USB ULPI PHY interface support"
 	depends on USB_SUPPORT
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index c690474..06794e2 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -20,7 +20,7 @@ config AB8500_USB
 
 config FSL_USB2_OTG
 	bool "Freescale USB OTG Transceiver Driver"
-	depends on USB_EHCI_FSL && USB_FSL_USB2 && USB_OTG_FSM && PM
+	depends on USB_EHCI_FSL && USB_FSL_USB2 && USB_OTG && PM
 	select USB_PHY
 	help
 	  Enable this to support Freescale USB OTG transceiver.
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 08/14] usb: otg: add OTG/dual-role core
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (6 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:53   ` Peter Chen
  2016-06-09  7:53   ` [PATCH v10 " Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
                   ` (6 subsequent siblings)
  14 siblings, 2 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

It provides APIs for the following tasks

- Registering an OTG/dual-role capable controller
- Registering Host and Gadget controllers to OTG core
- Providing inputs to and kicking the OTG state machine

Provide a dual-role device (DRD) state machine.
DRD mode is a reduced functionality OTG mode. In this mode
we don't support SRP, HNP and dynamic role-swap.

In DRD operation, the controller mode (Host or Peripheral)
is decided based on the ID pin status. Once a cable plug (Type-A
or Type-B) is attached the controller selects the state
and doesn't change till the cable in unplugged and a different
cable type is inserted.

As we don't need most of the complex OTG states and OTG timers
we implement a lean DRD state machine in usb-otg.c.
The DRD state machine is only interested in 2 hardware inputs
'id' and 'b_sess_vld'.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/usb/Kconfig          |  18 +
 drivers/usb/Makefile         |   1 +
 drivers/usb/common/Makefile  |   6 +-
 drivers/usb/common/usb-otg.c | 832 +++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/core/Kconfig     |  14 -
 drivers/usb/gadget/Kconfig   |   1 +
 include/linux/usb/gadget.h   |   2 +
 include/linux/usb/hcd.h      |   1 +
 include/linux/usb/otg-fsm.h  |   7 +
 include/linux/usb/otg.h      | 183 +++++++++-
 10 files changed, 1035 insertions(+), 30 deletions(-)
 create mode 100644 drivers/usb/common/usb-otg.c

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 8689dcb..ed596ec 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -32,6 +32,23 @@ if USB_SUPPORT
 config USB_COMMON
 	tristate
 
+config USB_OTG_CORE
+	tristate
+
+config USB_OTG
+	bool "OTG/Dual-role support"
+	depends on PM && USB && USB_GADGET
+	default n
+	---help---
+	  The most notable feature of USB OTG is support for a
+	  "Dual-Role" device, which can act as either a device
+	  or a host. The initial role is decided by the type of
+	  plug inserted and can be changed later when two dual
+	  role devices talk to each other.
+
+	  Select this only if your board has Mini-AB/Micro-AB
+	  connector.
+
 config USB_ARCH_HAS_HCD
 	def_bool y
 
@@ -40,6 +57,7 @@ config USB
 	tristate "Support for Host-side USB"
 	depends on USB_ARCH_HAS_HCD
 	select USB_COMMON
+	select USB_OTG_CORE
 	select NLS  # for UTF-8 strings
 	---help---
 	  Universal Serial Bus (USB) is a specification for a serial bus
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index dca7856..03f7204 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -59,5 +59,6 @@ obj-$(CONFIG_USB_RENESAS_USBHS)	+= renesas_usbhs/
 obj-$(CONFIG_USB_GADGET)	+= gadget/
 
 obj-$(CONFIG_USB_COMMON)	+= common/
+obj-$(CONFIG_USB_OTG_CORE)	+= common/
 
 obj-$(CONFIG_USBIP_CORE)	+= usbip/
diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
index f8f2c88..5122b3f 100644
--- a/drivers/usb/common/Makefile
+++ b/drivers/usb/common/Makefile
@@ -7,5 +7,7 @@ usb-common-y			  += common.o
 usb-common-$(CONFIG_USB_LED_TRIG) += led.o
 
 obj-$(CONFIG_USB_ULPI_BUS)	+= ulpi.o
-usbotg-y		:= usb-otg-fsm.o
-obj-$(CONFIG_USB_OTG)	+= usbotg.o
+ifeq ($(CONFIG_USB_OTG),y)
+usbotg-y		:= usb-otg.o usb-otg-fsm.o
+obj-$(CONFIG_USB_OTG_CORE)	+= usbotg.o
+endif
diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
new file mode 100644
index 0000000..b5bdf62
--- /dev/null
+++ b/drivers/usb/common/usb-otg.c
@@ -0,0 +1,832 @@
+/**
+ * drivers/usb/common/usb-otg.c - USB OTG core
+ *
+ * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Roger Quadros <rogerq@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/gadget.h>
+#include <linux/workqueue.h>
+
+/* OTG device list */
+LIST_HEAD(otg_list);
+static DEFINE_MUTEX(otg_list_mutex);
+
+static int usb_otg_hcd_is_primary_hcd(struct usb_hcd *hcd)
+{
+	if (!hcd->primary_hcd)
+		return 1;
+	return hcd == hcd->primary_hcd;
+}
+
+/**
+ * Check if the OTG device is in our OTG list and return
+ * usb_otg data, else NULL.
+ *
+ * otg_list_mutex must be held.
+ */
+static struct usb_otg *usb_otg_get_data(struct device *otg_dev)
+{
+	struct usb_otg *otg;
+
+	if (!otg_dev)
+		return NULL;
+
+	list_for_each_entry(otg, &otg_list, list) {
+		if (otg->dev == otg_dev)
+			return otg;
+	}
+
+	return NULL;
+}
+
+/**
+ * usb_otg_start_host - start/stop the host controller
+ * @otg:	usb_otg instance
+ * @on:		true to start, false to stop
+ *
+ * Start/stop the USB host controller. This function is meant
+ * for use by the OTG controller driver.
+ */
+int usb_otg_start_host(struct usb_otg *otg, int on)
+{
+	struct otg_hcd_ops *hcd_ops = otg->hcd_ops;
+
+	dev_dbg(otg->dev, "otg: %s %d\n", __func__, on);
+	if (!otg->host) {
+		WARN_ONCE(1, "otg: fsm running without host\n");
+		return 0;
+	}
+
+	if (on) {
+		if (otg->flags & OTG_FLAG_HOST_RUNNING)
+			return 0;
+
+		otg->flags |= OTG_FLAG_HOST_RUNNING;
+
+		/* start host */
+		hcd_ops->add(otg->primary_hcd.hcd, otg->primary_hcd.irqnum,
+			     otg->primary_hcd.irqflags);
+		if (otg->shared_hcd.hcd) {
+			hcd_ops->add(otg->shared_hcd.hcd,
+				     otg->shared_hcd.irqnum,
+				     otg->shared_hcd.irqflags);
+		}
+	} else {
+		if (!(otg->flags & OTG_FLAG_HOST_RUNNING))
+			return 0;
+
+		otg->flags &= ~OTG_FLAG_HOST_RUNNING;
+
+		/* stop host */
+		if (otg->shared_hcd.hcd)
+			hcd_ops->remove(otg->shared_hcd.hcd);
+
+		hcd_ops->remove(otg->primary_hcd.hcd);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_start_host);
+
+/**
+ * usb_otg_start_gadget - start/stop the gadget controller
+ * @otg:	usb_otg instance
+ * @on:		true to start, false to stop
+ *
+ * Start/stop the USB gadget controller. This function is meant
+ * for use by the OTG controller driver.
+ */
+int usb_otg_start_gadget(struct usb_otg *otg, int on)
+{
+	struct usb_gadget *gadget = otg->gadget;
+
+	dev_dbg(otg->dev, "otg: %s %d\n", __func__, on);
+	if (!gadget) {
+		WARN_ONCE(1, "otg: fsm running without gadget\n");
+		return 0;
+	}
+
+	if (on) {
+		if (otg->flags & OTG_FLAG_GADGET_RUNNING)
+			return 0;
+
+		otg->flags |= OTG_FLAG_GADGET_RUNNING;
+		otg->gadget_ops->start(otg->gadget);
+	} else {
+		if (!(otg->flags & OTG_FLAG_GADGET_RUNNING))
+			return 0;
+
+		otg->flags &= ~OTG_FLAG_GADGET_RUNNING;
+		otg->gadget_ops->stop(otg->gadget);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_start_gadget);
+
+/**
+ * Change USB protocol when there is a protocol change.
+ * fsm->lock must be held.
+ */
+static int drd_set_protocol(struct otg_fsm *fsm, int protocol)
+{
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
+	int ret = 0;
+
+	if (fsm->protocol != protocol) {
+		dev_dbg(otg->dev, "otg: changing role fsm->protocol= %d; new protocol= %d\n",
+			fsm->protocol, protocol);
+		/* stop old protocol */
+		if (fsm->protocol == PROTO_HOST) {
+			ret = otg_start_host(otg, 0);
+		} else if (fsm->protocol == PROTO_GADGET) {
+			otg->gadget_ops->connect_control(otg->gadget, false);
+			ret = otg_start_gadget(otg, 0);
+		}
+
+		if (ret)
+			return ret;
+
+		/* start new protocol */
+		if (protocol == PROTO_HOST) {
+			ret = otg_start_host(otg, 1);
+		} else if (protocol == PROTO_GADGET) {
+			ret = otg_start_gadget(otg, 1);
+			otg->gadget_ops->connect_control(otg->gadget, true);
+		}
+
+		if (ret)
+			return ret;
+
+		fsm->protocol = protocol;
+		return 0;
+	}
+
+	return 0;
+}
+
+/**
+ * Called when entering a DRD state.
+ * fsm->lock must be held.
+ */
+static void drd_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
+{
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
+
+	if (otg->state == new_state)
+		return;
+
+	fsm->state_changed = 1;
+	dev_dbg(otg->dev, "otg: set state: %s\n",
+		usb_otg_state_string(new_state));
+	switch (new_state) {
+	case OTG_STATE_B_IDLE:
+		drd_set_protocol(fsm, PROTO_UNDEF);
+		otg_drv_vbus(otg, 0);
+		break;
+	case OTG_STATE_B_PERIPHERAL:
+		drd_set_protocol(fsm, PROTO_GADGET);
+		otg_drv_vbus(otg, 0);
+		break;
+	case OTG_STATE_A_HOST:
+		drd_set_protocol(fsm, PROTO_HOST);
+		otg_drv_vbus(otg, 1);
+		break;
+	default:
+		dev_warn(otg->dev, "%s: otg: invalid state: %s\n",
+			 __func__, usb_otg_state_string(new_state));
+		break;
+	}
+
+	otg->state = new_state;
+}
+
+/**
+ * DRD state change judgement
+ *
+ * For DRD we're only interested in some of the OTG states
+ * i.e. OTG_STATE_B_IDLE: both peripheral and host are stopped
+ *	OTG_STATE_B_PERIPHERAL: peripheral active
+ *	OTG_STATE_A_HOST: host active
+ * we're only interested in the following inputs
+ *	fsm->id, fsm->b_sess_vld
+ */
+int drd_statemachine(struct usb_otg *otg)
+{
+	struct otg_fsm *fsm = &otg->fsm;
+	enum usb_otg_state state;
+	int ret;
+
+	mutex_lock(&fsm->lock);
+
+	fsm->state_changed = 0;
+	state = otg->state;
+
+	switch (state) {
+	case OTG_STATE_UNDEFINED:
+		if (!fsm->id)
+			drd_set_state(fsm, OTG_STATE_A_HOST);
+		else if (fsm->id && fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
+		else
+			drd_set_state(fsm, OTG_STATE_B_IDLE);
+		break;
+	case OTG_STATE_B_IDLE:
+		if (!fsm->id)
+			drd_set_state(fsm, OTG_STATE_A_HOST);
+		else if (fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
+		break;
+	case OTG_STATE_B_PERIPHERAL:
+		if (!fsm->id)
+			drd_set_state(fsm, OTG_STATE_A_HOST);
+		else if (!fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_IDLE);
+		break;
+	case OTG_STATE_A_HOST:
+		if (fsm->id && fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
+		else if (fsm->id && !fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_IDLE);
+		break;
+
+	default:
+		dev_err(otg->dev, "%s: otg: invalid usb-drd state: %s\n",
+			__func__, usb_otg_state_string(state));
+		break;
+	}
+
+	ret = fsm->state_changed;
+	mutex_unlock(&fsm->lock);
+	dev_dbg(otg->dev, "otg: quit statemachine, changed %d\n",
+		fsm->state_changed);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(drd_statemachine);
+
+/**
+ * Dual-role device (DRD) work function
+ */
+static void usb_drd_work(struct work_struct *work)
+{
+	struct usb_otg *otg = container_of(work, struct usb_otg, work);
+
+	pm_runtime_get_sync(otg->dev);
+	while (drd_statemachine(otg))
+	;
+	pm_runtime_put_sync(otg->dev);
+}
+
+/**
+ * usb_otg_register() - Register the OTG/dual-role device to OTG core
+ * @dev: OTG/dual-role controller device.
+ * @config: OTG configuration.
+ *
+ * Registers the OTG/dual-role controller device with the USB OTG core.
+ *
+ * Return: struct usb_otg * if success, ERR_PTR() if error.
+ */
+struct usb_otg *usb_otg_register(struct device *dev,
+				 struct usb_otg_config *config)
+{
+	struct usb_otg *otg;
+	int ret = 0;
+
+	if (!dev || !config || !config->fsm_ops)
+		return ERR_PTR(-EINVAL);
+
+	/* already in list? */
+	mutex_lock(&otg_list_mutex);
+	if (usb_otg_get_data(dev)) {
+		dev_err(dev, "otg: %s: device already in otg list\n",
+			__func__);
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	/* allocate and add to list */
+	otg = kzalloc(sizeof(*otg), GFP_KERNEL);
+	if (!otg) {
+		ret = -ENOMEM;
+		goto unlock;
+	}
+
+	otg->dev = dev;
+	/* otg->caps is controller caps + DT overrides */
+	otg->caps = *config->otg_caps;
+	ret = of_usb_update_otg_caps(dev->of_node, &otg->caps);
+	if (ret)
+		goto err_wq;
+
+	if ((otg->caps.hnp_support || otg->caps.srp_support ||
+	     otg->caps.adp_support) && !config->otg_work) {
+		dev_err(dev,
+			"otg: otg_work must be provided for OTG support\n");
+		ret = -EINVAL;
+		goto err_wq;
+	}
+
+	if (config->otg_work)	/* custom otg_work ? */
+		INIT_WORK(&otg->work, config->otg_work);
+	else
+		INIT_WORK(&otg->work, usb_drd_work);
+
+	otg->wq = create_freezable_workqueue("usb_otg");
+	if (!otg->wq) {
+		dev_err(dev, "otg: %s: can't create workqueue\n",
+			__func__);
+		ret = -ENOMEM;
+		goto err_wq;
+	}
+
+	/* set otg ops */
+	otg->fsm.ops = config->fsm_ops;
+
+	mutex_init(&otg->fsm.lock);
+
+	list_add_tail(&otg->list, &otg_list);
+	mutex_unlock(&otg_list_mutex);
+
+	return otg;
+
+err_wq:
+	kfree(otg);
+unlock:
+	mutex_unlock(&otg_list_mutex);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(usb_otg_register);
+
+/**
+ * usb_otg_unregister() - Unregister the OTG/dual-role device from USB OTG core
+ * @dev: OTG controller device.
+ *
+ * Unregisters the OTG/dual-role controller device from USB OTG core.
+ * Prevents unregistering till both the associated Host and Gadget controllers
+ * have unregistered from the OTG core.
+ *
+ * Return: 0 on success, error value otherwise.
+ */
+int usb_otg_unregister(struct device *dev)
+{
+	struct usb_otg *otg;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(dev);
+	if (!otg) {
+		dev_err(dev, "otg: %s: device not in otg list\n",
+			__func__);
+		mutex_unlock(&otg_list_mutex);
+		return -EINVAL;
+	}
+
+	/* prevent unregister till both host & gadget have unregistered */
+	if (otg->host || otg->gadget) {
+		dev_err(dev, "otg: %s: host/gadget still registered\n",
+			__func__);
+		return -EBUSY;
+	}
+
+	/* OTG FSM is halted when host/gadget unregistered */
+	destroy_workqueue(otg->wq);
+
+	/* remove from otg list */
+	list_del(&otg->list);
+	kfree(otg);
+	mutex_unlock(&otg_list_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_unregister);
+
+/**
+ * start/kick the OTG FSM if we can
+ * fsm->lock must be held
+ */
+static void usb_otg_start_fsm(struct usb_otg *otg)
+{
+	struct otg_fsm *fsm = &otg->fsm;
+
+	if (fsm->running)
+		goto kick_fsm;
+
+	if (!otg->host) {
+		dev_info(otg->dev, "otg: can't start till host registers\n");
+		return;
+	}
+
+	if (!otg->gadget) {
+		dev_info(otg->dev,
+			 "otg: can't start till gadget UDC registers\n");
+		return;
+	}
+
+	if (!otg->gadget_ready) {
+		dev_info(otg->dev,
+			 "otg: can't start till gadget function registers\n");
+		return;
+	}
+
+	fsm->running = true;
+kick_fsm:
+	queue_work(otg->wq, &otg->work);
+}
+
+/**
+ * stop the OTG FSM. Stops Host & Gadget controllers as well.
+ * fsm->lock must be held
+ */
+static void usb_otg_stop_fsm(struct usb_otg *otg)
+{
+	struct otg_fsm *fsm = &otg->fsm;
+
+	if (!fsm->running)
+		return;
+
+	/* no more new events queued */
+	fsm->running = false;
+
+	flush_workqueue(otg->wq);
+	otg->state = OTG_STATE_UNDEFINED;
+
+	/* stop host/gadget immediately */
+	if (fsm->protocol == PROTO_HOST) {
+		otg_start_host(otg, 0);
+	} else if (fsm->protocol == PROTO_GADGET) {
+		otg->gadget_ops->connect_control(otg->gadget, false);
+		otg_start_gadget(otg, 0);
+	}
+	fsm->protocol = PROTO_UNDEF;
+}
+
+/**
+ * usb_otg_sync_inputs - Sync OTG inputs with the OTG state machine
+ * @fsm:	OTG FSM instance
+ *
+ * Used by the OTG driver to update the inputs to the OTG
+ * state machine.
+ *
+ * Can be called in IRQ context.
+ */
+void usb_otg_sync_inputs(struct usb_otg *otg)
+{
+	/* Don't kick FSM till it has started */
+	if (!otg->fsm.running)
+		return;
+
+	/* Kick FSM */
+	queue_work(otg->wq, &otg->work);
+}
+EXPORT_SYMBOL_GPL(usb_otg_sync_inputs);
+
+/**
+ * usb_otg_kick_fsm - Kick the OTG state machine
+ * @otg_dev:	OTG controller device
+ *
+ * Used by USB host/device stack to sync OTG related
+ * events to the OTG state machine.
+ * e.g. change in host_bus->b_hnp_enable, gadget->b_hnp_enable
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_kick_fsm(struct device *otg_dev)
+{
+	struct usb_otg *otg;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_dbg(otg_dev, "otg: %s: invalid otg device\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	usb_otg_sync_inputs(otg);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_kick_fsm);
+
+/**
+ * usb_otg_register_hcd - Register the host controller to OTG core
+ * @hcd:	host controller device
+ * @irqnum:	interrupt number
+ * @irqflags:	interrupt flags
+ * @ops:	HCD ops to interface with the HCD
+ *
+ * This is used by the USB Host stack to register the host controller
+ * to the OTG core. Host controller must not be started by the
+ * caller as it is left upto the OTG state machine to do so.
+ * hcd->otg_dev must contain the related otg controller device.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
+			 unsigned long irqflags, struct otg_hcd_ops *ops)
+{
+	struct usb_otg *otg;
+	struct device *hcd_dev = hcd->self.controller;
+	struct device *otg_dev = hcd->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;
+
+	/* we're otg but otg controller might not yet be registered */
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_dbg(hcd_dev,
+			"otg: controller not yet registered. deferring.\n");
+		return -EPROBE_DEFER;
+	}
+
+	/* HCD will be started by OTG fsm when needed */
+	mutex_lock(&otg->fsm.lock);
+	if (otg->primary_hcd.hcd) {
+		/* probably a shared HCD ? */
+		if (usb_otg_hcd_is_primary_hcd(hcd)) {
+			dev_err(otg_dev, "otg: primary host already registered\n");
+			goto err;
+		}
+
+		if (hcd->shared_hcd == otg->primary_hcd.hcd) {
+			if (otg->shared_hcd.hcd) {
+				dev_err(otg_dev, "otg: shared host already registered\n");
+				goto err;
+			}
+
+			otg->shared_hcd.hcd = hcd;
+			otg->shared_hcd.irqnum = irqnum;
+			otg->shared_hcd.irqflags = irqflags;
+			otg->shared_hcd.ops = ops;
+			dev_info(otg_dev, "otg: shared host %s registered\n",
+				 dev_name(hcd->self.controller));
+		} else {
+			dev_err(otg_dev, "otg: invalid shared host %s\n",
+				dev_name(hcd->self.controller));
+			goto err;
+		}
+	} else {
+		if (!usb_otg_hcd_is_primary_hcd(hcd)) {
+			dev_err(otg_dev, "otg: primary host must be registered first\n");
+			goto err;
+		}
+
+		otg->primary_hcd.hcd = hcd;
+		otg->primary_hcd.irqnum = irqnum;
+		otg->primary_hcd.irqflags = irqflags;
+		otg->primary_hcd.ops = ops;
+		otg->hcd_ops = ops;
+		dev_info(otg_dev, "otg: primary host %s registered\n",
+			 dev_name(hcd->self.controller));
+	}
+
+	/*
+	 * we're ready only if we have shared HCD
+	 * or we don't need shared HCD.
+	 */
+	if (otg->shared_hcd.hcd || !otg->primary_hcd.hcd->shared_hcd) {
+		otg->host = hcd_to_bus(hcd);
+		/* FIXME: set bus->otg_port if this is true OTG port with HNP */
+
+		/* start FSM */
+		usb_otg_start_fsm(otg);
+	} else {
+		dev_dbg(otg_dev, "otg: can't start till shared host registers\n");
+	}
+
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+
+err:
+	mutex_unlock(&otg->fsm.lock);
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(usb_otg_register_hcd);
+
+/**
+ * usb_otg_unregister_hcd - Unregister the host controller from OTG core
+ * @hcd:	host controller device
+ *
+ * This is used by the USB Host stack to unregister the host controller
+ * from the OTG core. Ensures that host controller is not running
+ * on successful return.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_unregister_hcd(struct usb_hcd *hcd)
+{
+	struct usb_otg *otg;
+	struct device *hcd_dev = hcd_to_bus(hcd)->controller;
+	struct device *otg_dev = hcd->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;	/* we're definitely not OTG */
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_err(hcd_dev, "otg: host %s wasn't registered with otg\n",
+			dev_name(hcd_dev));
+		return -EINVAL;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (hcd == otg->primary_hcd.hcd) {
+		otg->primary_hcd.hcd = NULL;
+		dev_info(otg_dev, "otg: primary host %s unregistered\n",
+			 dev_name(hcd_dev));
+	} else if (hcd == otg->shared_hcd.hcd) {
+		otg->shared_hcd.hcd = NULL;
+		dev_info(otg_dev, "otg: shared host %s unregistered\n",
+			 dev_name(hcd_dev));
+	} else {
+		mutex_unlock(&otg->fsm.lock);
+		dev_err(otg_dev, "otg: host %s wasn't registered with otg\n",
+			dev_name(hcd_dev));
+		return -EINVAL;
+	}
+
+	/* stop FSM & Host */
+	usb_otg_stop_fsm(otg);
+	otg->host = NULL;
+
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_unregister_hcd);
+
+/**
+ * usb_otg_register_gadget - Register the gadget controller to OTG core
+ * @gadget:	gadget controller
+ *
+ * This is used by the USB gadget stack to register the gadget controller
+ * to the OTG core. Gadget controller must not be started by the
+ * caller as it is left upto the OTG state machine to do so.
+ *
+ * Gadget core must call this only when all resources required for
+ * gadget controller to run are available.
+ * i.e. gadget function driver is available.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_register_gadget(struct usb_gadget *gadget,
+			    struct otg_gadget_ops *ops)
+{
+	struct usb_otg *otg;
+	struct device *gadget_dev = &gadget->dev;
+	struct device *otg_dev = gadget->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;	/* we're definitely not OTG */
+
+	/* we're otg but otg controller might not yet be registered */
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_dbg(gadget_dev,
+			"otg: controller not yet registered, deferring.\n");
+		return -EPROBE_DEFER;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (otg->gadget) {
+		dev_err(otg_dev, "otg: gadget already registered with otg\n");
+		mutex_unlock(&otg->fsm.lock);
+		return -EINVAL;
+	}
+
+	otg->gadget = gadget;
+	otg->gadget_ops = ops;
+	dev_info(otg_dev, "otg: gadget %s registered\n",
+		 dev_name(&gadget->dev));
+
+	/* FSM will be started in usb_otg_gadget_ready() */
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_register_gadget);
+
+/**
+ * usb_otg_unregister_gadget - Unregister the gadget controller from OTG core
+ * @gadget:	gadget controller
+ *
+ * This is used by the USB gadget stack to unregister the gadget controller
+ * from the OTG core. Ensures that gadget controller is halted
+ * on successful return.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_unregister_gadget(struct usb_gadget *gadget)
+{
+	struct usb_otg *otg;
+	struct device *gadget_dev = &gadget->dev;
+	struct device *otg_dev = gadget->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_err(gadget_dev,
+			"otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (otg->gadget != gadget) {
+		mutex_unlock(&otg->fsm.lock);
+		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	/* FSM must be stopped in usb_otg_gadget_ready() */
+	if (otg->gadget_ready) {
+		dev_err(otg_dev,
+			"otg: gadget %s unregistered before being unready, forcing stop\n",
+			dev_name(&gadget->dev));
+		usb_otg_stop_fsm(otg);
+	}
+
+	otg->gadget = NULL;
+	mutex_unlock(&otg->fsm.lock);
+
+	dev_info(otg_dev, "otg: gadget %s unregistered\n",
+		 dev_name(&gadget->dev));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_unregister_gadget);
+
+int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
+{
+	struct usb_otg *otg;
+	struct device *gadget_dev = &gadget->dev;
+	struct device *otg_dev = gadget->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_err(gadget_dev,
+			"otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (otg->gadget != gadget) {
+		mutex_unlock(&otg->fsm.lock);
+		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	/* Start/stop FSM & gadget */
+	otg->gadget_ready = ready;
+	if (ready)
+		usb_otg_start_fsm(otg);
+	else
+		usb_otg_stop_fsm(otg);
+
+	dev_dbg(otg_dev, "otg: gadget %s %sready\n", dev_name(&gadget->dev),
+		ready ? "" : "not ");
+
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_gadget_ready);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index ae228d0..37f8c54 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -41,20 +41,6 @@ config USB_DYNAMIC_MINORS
 
 	  If you are unsure about this, say N here.
 
-config USB_OTG
-	bool "OTG support"
-	depends on PM
-	default n
-	help
-	  The most notable feature of USB OTG is support for a
-	  "Dual-Role" device, which can act as either a device
-	  or a host. The initial role is decided by the type of
-	  plug inserted and can be changed later when two dual
-	  role devices talk to each other.
-
-	  Select this only if your board has Mini-AB/Micro-AB
-	  connector.
-
 config USB_OTG_WHITELIST
 	bool "Rely on OTG and EH Targeted Peripherals List"
 	depends on USB
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 2057add..9d55384 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -16,6 +16,7 @@
 menuconfig USB_GADGET
 	tristate "USB Gadget Support"
 	select USB_COMMON
+	select USB_OTG_CORE
 	select NLS
 	help
 	   USB is a master/slave protocol, organized with one master
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 51e3bde..1237f66 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -583,6 +583,7 @@ struct usb_gadget_ops {
  * @out_epnum: last used out ep number
  * @in_epnum: last used in ep number
  * @otg_caps: OTG capabilities of this gadget.
+ * @otg_dev: OTG controller device, if needs to be used with OTG core.
  * @sg_supported: true if we can handle scatter-gather
  * @is_otg: True if the USB device port uses a Mini-AB jack, so that the
  *	gadget driver must provide a USB OTG descriptor.
@@ -639,6 +640,7 @@ struct usb_gadget {
 	unsigned			out_epnum;
 	unsigned			in_epnum;
 	struct usb_otg_caps		*otg_caps;
+	struct device			*otg_dev;
 
 	unsigned			sg_supported:1;
 	unsigned			is_otg:1;
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 7914bed..845c761 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -185,6 +185,7 @@ struct usb_hcd {
 	struct mutex		*bandwidth_mutex;
 	struct usb_hcd		*shared_hcd;
 	struct usb_hcd		*primary_hcd;
+	struct device		*otg_dev;	/* OTG controller device */
 
 
 #define HCD_BUFFER_POOLS	4
diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
index 26e6531..943714a 100644
--- a/include/linux/usb/otg-fsm.h
+++ b/include/linux/usb/otg-fsm.h
@@ -60,6 +60,11 @@ enum otg_fsm_timer {
 /**
  * struct otg_fsm - OTG state machine according to the OTG spec
  *
+ * DRD mode hardware Inputs
+ *
+ * @id:		TRUE for B-device, FALSE for A-device.
+ * @b_sess_vld:	VBUS voltage in regulation.
+ *
  * OTG hardware Inputs
  *
  *	Common inputs for A and B device
@@ -132,6 +137,7 @@ enum otg_fsm_timer {
  * a_clr_err:	Asserted (by application ?) to clear a_vbus_err due to an
  *		overcurrent condition and causes the A-device to transition
  *		to a_wait_vfall
+ * running:	state machine running/stopped indicator
  */
 struct otg_fsm {
 	/* Input */
@@ -187,6 +193,7 @@ struct otg_fsm {
 	int b_ase0_brst_tmout;
 	int a_bidl_adis_tmout;
 
+	bool running;
 	struct otg_fsm_ops *ops;
 
 	/* Current usb protocol used: 0:undefine; 1:host; 2:client */
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 85b8fb5..cc58a2d 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -10,10 +10,70 @@
 #define __LINUX_USB_OTG_H
 
 #include <linux/phy/phy.h>
-#include <linux/usb/phy.h>
-#include <linux/usb/otg-fsm.h>
+#include <linux/device.h>
+#include <linux/hrtimer.h>
+#include <linux/ktime.h>
+#include <linux/usb.h>
 #include <linux/usb/hcd.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg-fsm.h>
+#include <linux/usb/phy.h>
+
+/**
+ * struct otg_hcd - host controller state and interface
+ *
+ * @hcd: host controller
+ * @irqnum: irq number
+ * @irqflags: irq flags
+ * @ops: otg to host controller interface
+ * @ops: otg to host controller interface
+ * @otg_dev: otg controller device
+ */
+struct otg_hcd {
+	struct usb_hcd *hcd;
+	unsigned int irqnum;
+	unsigned long irqflags;
+	struct otg_hcd_ops *ops;
+	struct device *otg_dev;
+};
+
+/**
+ * struct usb_otg_caps - describes the otg capabilities of the device
+ * @otg_rev: The OTG revision number the device is compliant with, it's
+ *		in binary-coded decimal (i.e. 2.0 is 0200H).
+ * @hnp_support: Indicates if the device supports HNP.
+ * @srp_support: Indicates if the device supports SRP.
+ * @adp_support: Indicates if the device supports ADP.
+ */
+struct usb_otg_caps {
+	u16 otg_rev;
+	bool hnp_support;
+	bool srp_support;
+	bool adp_support;
+};
 
+/**
+ * struct usb_otg - usb otg controller state
+ *
+ * @default_a: Indicates we are an A device. i.e. Host.
+ * @phy: USB phy interface
+ * @usb_phy: old usb_phy interface
+ * @host: host controller bus
+ * @gadget: gadget device
+ * @state: current otg state
+ * @dev: otg controller device
+ * @caps: otg capabilities revision, hnp, srp, etc
+ * @fsm: otg finite state machine
+ * @hcd_ops: host controller interface
+ * ------- internal use only -------
+ * @primary_hcd: primary host state and interface
+ * @shared_hcd: shared host state and interface
+ * @gadget_ops: gadget controller interface
+ * @list: list of otg controllers
+ * @work: otg state machine work
+ * @wq: otg state machine work queue
+ * @flags: to track if host/gadget is running
+ */
 struct usb_otg {
 	u8			default_a;
 
@@ -24,9 +84,25 @@ struct usb_otg {
 	struct usb_gadget	*gadget;
 
 	enum usb_otg_state	state;
+	struct device *dev;
+	struct usb_otg_caps	caps;
 	struct otg_fsm fsm;
 	struct otg_hcd_ops	*hcd_ops;
 
+	/* internal use only */
+	struct otg_hcd primary_hcd;
+	struct otg_hcd shared_hcd;
+	struct otg_gadget_ops *gadget_ops;
+	bool gadget_ready;
+	struct list_head list;
+	struct work_struct work;
+	struct workqueue_struct *wq;
+	u32 flags;
+#define OTG_FLAG_GADGET_RUNNING (1 << 0)
+#define OTG_FLAG_HOST_RUNNING (1 << 1)
+	/* use otg->fsm.lock for serializing access */
+
+/*------------- deprecated interface -----------------------------*/
 	/* bind/unbind the host controller */
 	int	(*set_host)(struct usb_otg *otg, struct usb_bus *host);
 
@@ -42,26 +118,101 @@ struct usb_otg {
 
 	/* start or continue HNP role switch */
 	int	(*start_hnp)(struct usb_otg *otg);
-
+/*---------------------------------------------------------------*/
 };
 
 /**
- * struct usb_otg_caps - describes the otg capabilities of the device
- * @otg_rev: The OTG revision number the device is compliant with, it's
- *		in binary-coded decimal (i.e. 2.0 is 0200H).
- * @hnp_support: Indicates if the device supports HNP.
- * @srp_support: Indicates if the device supports SRP.
- * @adp_support: Indicates if the device supports ADP.
+ * struct usb_otg_config - otg controller configuration
+ * @caps: otg capabilities of the controller
+ * @ops: otg fsm operations
+ * @otg_work: optional custom otg state machine work function
  */
-struct usb_otg_caps {
-	u16 otg_rev;
-	bool hnp_support;
-	bool srp_support;
-	bool adp_support;
+struct usb_otg_config {
+	struct usb_otg_caps *otg_caps;
+	struct otg_fsm_ops *fsm_ops;
+	void (*otg_work)(struct work_struct *work);
 };
 
 extern const char *usb_otg_state_string(enum usb_otg_state state);
 
+#if IS_ENABLED(CONFIG_USB_OTG)
+struct usb_otg *usb_otg_register(struct device *dev,
+				 struct usb_otg_config *config);
+int usb_otg_unregister(struct device *dev);
+int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
+			 unsigned long irqflags, struct otg_hcd_ops *ops);
+int usb_otg_unregister_hcd(struct usb_hcd *hcd);
+int usb_otg_register_gadget(struct usb_gadget *gadget,
+			    struct otg_gadget_ops *ops);
+int usb_otg_unregister_gadget(struct usb_gadget *gadget);
+void usb_otg_sync_inputs(struct usb_otg *otg);
+int usb_otg_kick_fsm(struct device *otg_dev);
+int usb_otg_start_host(struct usb_otg *otg, int on);
+int usb_otg_start_gadget(struct usb_otg *otg, int on);
+int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready);
+
+#else /* CONFIG_USB_OTG */
+
+static inline struct usb_otg *usb_otg_register(struct device *dev,
+					       struct usb_otg_config *config)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline int usb_otg_unregister(struct device *dev)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
+				       unsigned long irqflags,
+				       struct otg_hcd_ops *ops)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_unregister_hcd(struct usb_hcd *hcd)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_register_gadget(struct usb_gadget *gadget,
+					  struct otg_gadget_ops *ops)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_unregister_gadget(struct usb_gadget *gadget)
+{
+	return -ENOTSUPP;
+}
+
+static inline void usb_otg_sync_inputs(struct usb_otg *otg)
+{
+}
+
+static inline int usb_otg_kick_fsm(struct device *otg_dev)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_start_host(struct usb_otg *otg, int on)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_start_gadget(struct usb_otg *otg, int on)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
+{
+	return -ENOTSUPP;
+}
+#endif /* CONFIG_USB_OTG */
+
+/*------------- deprecated interface -----------------------------*/
 /* Context: can sleep */
 static inline int
 otg_start_hnp(struct usb_otg *otg)
@@ -113,6 +264,8 @@ otg_start_srp(struct usb_otg *otg)
 	return -ENOTSUPP;
 }
 
+/*---------------------------------------------------------------*/
+
 /* for OTG controller drivers (and maybe other stuff) */
 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
 
@@ -237,4 +390,6 @@ static inline int otg_start_gadget(struct usb_otg *otg, int on)
 	return otg->fsm.ops->start_gadget(otg, on);
 }
 
+int drd_statemachine(struct usb_otg *otg);
+
 #endif /* __LINUX_USB_OTG_H */
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (7 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 08/14] usb: otg: add OTG/dual-role core Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 10/14] usb: otg: add hcd companion support Roger Quadros
                   ` (5 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

The OTG controller and the USB controller can be linked via the
'otg-controller' property in the USB controller's device node.

of_usb_get_otg() can be used to get the OTG controller device
from the USB controller's device node.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/usb/generic.txt |  3 +++
 drivers/usb/common/common.c                       | 27 +++++++++++++++++++++++
 include/linux/usb/of.h                            |  9 ++++++++
 3 files changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index bba8257..f6866c1 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -24,6 +24,9 @@ Optional properties:
 			optional for OTG device.
  - adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is
 			optional for OTG device.
+ - otg-controller: phandle to otg controller. Host or gadget controllers can
+			contain this property to link it to a particular OTG
+			controller.
 
 This is an attribute to a USB controller such as:
 
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index e3d0161..d7ec471 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -238,6 +238,33 @@ int of_usb_update_otg_caps(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
 
+#ifdef CONFIG_USB_OTG
+/**
+ * of_usb_get_otg - get the OTG controller linked to the USB controller
+ * @np: Pointer to the device_node of the USB controller
+ * @otg_caps: Pointer to the target usb_otg_caps to be set
+ *
+ * Returns the OTG controller device or NULL on error.
+ */
+struct device *of_usb_get_otg(struct device_node *np)
+{
+	struct device_node *otg_np;
+	struct platform_device *pdev;
+
+	otg_np = of_parse_phandle(np, "otg-controller", 0);
+	if (!otg_np)
+		return NULL;
+
+	pdev = of_find_device_by_node(otg_np);
+	of_node_put(otg_np);
+	if (!pdev)
+		return NULL;
+
+	return &pdev->dev;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_otg);
+#endif
+
 #endif
 
 MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index de3237f..499a4e8 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -40,6 +40,15 @@ static inline struct device_node *usb_of_get_child_node
 }
 #endif
 
+#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_OTG)
+struct device *of_usb_get_otg(struct device_node *np);
+#else
+static inline struct device *of_usb_get_otg(struct device_node *np)
+{
+	return NULL;
+}
+#endif
+
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
 enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np);
 #else
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 10/14] usb: otg: add hcd companion support
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (8 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
                   ` (4 subsequent siblings)
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Since some host controller (e.g. EHCI) needs a companion host controller
(e.g. OHCI), this patch adds such a configuration to use it in the OTG
core.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/usb/generic.txt |  3 +++
 drivers/usb/common/usb-otg.c                      | 32 ++++++++++++++++-------
 include/linux/usb/otg.h                           |  7 ++++-
 3 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index f6866c1..1db1c33 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -27,6 +27,9 @@ Optional properties:
  - otg-controller: phandle to otg controller. Host or gadget controllers can
 			contain this property to link it to a particular OTG
 			controller.
+ - hcd-needs-companion: must be present if otg controller is dealing with
+			EHCI host controller that needs a companion OHCI host
+			controller.
 
 This is an attribute to a USB controller such as:
 
diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
index b5bdf62..98fcfa2 100644
--- a/drivers/usb/common/usb-otg.c
+++ b/drivers/usb/common/usb-otg.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/usb/of.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/gadget.h>
 #include <linux/workqueue.h>
@@ -348,6 +349,10 @@ struct usb_otg *usb_otg_register(struct device *dev,
 	else
 		INIT_WORK(&otg->work, usb_drd_work);
 
+	if (of_find_property(dev->of_node, "hcd-needs-companion", NULL) ||
+	    config->hcd_needs_companion)	/* needs companion ? */
+		otg->flags |= OTG_FLAG_HCD_NEEDS_COMPANION;
+
 	otg->wq = create_freezable_workqueue("usb_otg");
 	if (!otg->wq) {
 		dev_err(dev, "otg: %s: can't create workqueue\n",
@@ -562,15 +567,18 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
 	/* HCD will be started by OTG fsm when needed */
 	mutex_lock(&otg->fsm.lock);
 	if (otg->primary_hcd.hcd) {
-		/* probably a shared HCD ? */
-		if (usb_otg_hcd_is_primary_hcd(hcd)) {
+		/* probably a shared HCD or a companion OHCI HCD ? */
+		if (!(otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION) &&
+		    usb_otg_hcd_is_primary_hcd(hcd)) {
 			dev_err(otg_dev, "otg: primary host already registered\n");
 			goto err;
 		}
 
-		if (hcd->shared_hcd == otg->primary_hcd.hcd) {
+		if (otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION ||
+		    (hcd->shared_hcd == otg->primary_hcd.hcd)) {
 			if (otg->shared_hcd.hcd) {
-				dev_err(otg_dev, "otg: shared host already registered\n");
+				dev_err(otg_dev,
+					"otg: shared/companion host already registered\n");
 				goto err;
 			}
 
@@ -578,10 +586,12 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
 			otg->shared_hcd.irqnum = irqnum;
 			otg->shared_hcd.irqflags = irqflags;
 			otg->shared_hcd.ops = ops;
-			dev_info(otg_dev, "otg: shared host %s registered\n",
+			dev_info(otg_dev,
+				 "otg: shared/companion host %s registered\n",
 				 dev_name(hcd->self.controller));
 		} else {
-			dev_err(otg_dev, "otg: invalid shared host %s\n",
+			dev_err(otg_dev,
+				"otg: invalid shared/companion host %s\n",
 				dev_name(hcd->self.controller));
 			goto err;
 		}
@@ -604,14 +614,17 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
 	 * we're ready only if we have shared HCD
 	 * or we don't need shared HCD.
 	 */
-	if (otg->shared_hcd.hcd || !otg->primary_hcd.hcd->shared_hcd) {
+	if (otg->shared_hcd.hcd ||
+	    (!(otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION) &&
+	     !otg->primary_hcd.hcd->shared_hcd)) {
 		otg->host = hcd_to_bus(hcd);
 		/* FIXME: set bus->otg_port if this is true OTG port with HNP */
 
 		/* start FSM */
 		usb_otg_start_fsm(otg);
 	} else {
-		dev_dbg(otg_dev, "otg: can't start till shared host registers\n");
+		dev_dbg(otg_dev,
+			"otg: can't start till shared/companion host registers\n");
 	}
 
 	mutex_unlock(&otg->fsm.lock);
@@ -659,7 +672,8 @@ int usb_otg_unregister_hcd(struct usb_hcd *hcd)
 			 dev_name(hcd_dev));
 	} else if (hcd == otg->shared_hcd.hcd) {
 		otg->shared_hcd.hcd = NULL;
-		dev_info(otg_dev, "otg: shared host %s unregistered\n",
+		dev_info(otg_dev,
+			 "otg: shared/companion host %s unregistered\n",
 			 dev_name(hcd_dev));
 	} else {
 		mutex_unlock(&otg->fsm.lock);
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index cc58a2d..4c585ec 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -72,7 +72,8 @@ struct usb_otg_caps {
  * @list: list of otg controllers
  * @work: otg state machine work
  * @wq: otg state machine work queue
- * @flags: to track if host/gadget is running
+ * @flags: to track if host/gadget is running, or to indicate if hcd needs
+ *	   companion
  */
 struct usb_otg {
 	u8			default_a;
@@ -100,6 +101,7 @@ struct usb_otg {
 	u32 flags;
 #define OTG_FLAG_GADGET_RUNNING (1 << 0)
 #define OTG_FLAG_HOST_RUNNING (1 << 1)
+#define OTG_FLAG_HCD_NEEDS_COMPANION (1 << 2)
 	/* use otg->fsm.lock for serializing access */
 
 /*------------- deprecated interface -----------------------------*/
@@ -126,11 +128,14 @@ struct usb_otg {
  * @caps: otg capabilities of the controller
  * @ops: otg fsm operations
  * @otg_work: optional custom otg state machine work function
+ * @hcd_needs_companion: Indicates if host controller needs a companion
+ *			 controller
  */
 struct usb_otg_config {
 	struct usb_otg_caps *otg_caps;
 	struct otg_fsm_ops *fsm_ops;
 	void (*otg_work)(struct work_struct *work);
+	bool hcd_needs_companion;
 };
 
 extern const char *usb_otg_state_string(enum usb_otg_state state);
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG()
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (9 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 10/14] usb: otg: add hcd companion support Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08 15:10   ` Joe Perches
  2016-06-09  7:55   ` [PATCH v10 " Roger Quadros
  2016-06-08  9:03 ` [PATCH v9 12/14] usb: hcd: Adapt to OTG core Roger Quadros
                   ` (3 subsequent siblings)
  14 siblings, 2 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

Now that we have a device reference in struct usb_otg
let's use dev_dbg() for debug messages.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/common/usb-otg-fsm.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
index 482d4c9..e6e58c2 100644
--- a/drivers/usb/common/usb-otg-fsm.c
+++ b/drivers/usb/common/usb-otg-fsm.c
@@ -30,13 +30,6 @@
 #include <linux/usb/otg.h>
 #include <linux/usb/otg-fsm.h>
 
-#ifdef VERBOSE
-#define VDBG(fmt, args...) pr_debug("[%s]  " fmt, \
-				 __func__, ## args)
-#else
-#define VDBG(stuff...)	do {} while (0)
-#endif
-
 /* Change USB protocol when there is a protocol change */
 static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 {
@@ -44,8 +37,9 @@ static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 	int ret = 0;
 
 	if (fsm->protocol != protocol) {
-		VDBG("Changing role fsm->protocol= %d; new protocol= %d\n",
-			fsm->protocol, protocol);
+		dev_vdbg(otg->dev,
+			 "Changing role fsm->protocol= %d; new protocol= %d\n",
+			 fsm->protocol, protocol);
 		/* stop old protocol */
 		if (fsm->protocol == PROTO_HOST)
 			ret = otg_start_host(otg, 0);
@@ -226,7 +220,7 @@ static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
 
 	if (otg->state == new_state)
 		return 0;
-	VDBG("Set state: %s\n", usb_otg_state_string(new_state));
+	dev_vdbg(otg->dev, "Set state: %s\n", usb_otg_state_string(new_state));
 	otg_leave_state(fsm, otg->state);
 	switch (new_state) {
 	case OTG_STATE_B_IDLE:
@@ -358,7 +352,7 @@ int otg_statemachine(struct usb_otg *otg)
 
 	switch (state) {
 	case OTG_STATE_UNDEFINED:
-		VDBG("fsm->id = %d\n", fsm->id);
+		dev_vdbg(otg->dev, "fsm->id = %d\n", fsm->id);
 		if (fsm->id)
 			otg_set_state(fsm, OTG_STATE_B_IDLE);
 		else
@@ -466,7 +460,8 @@ int otg_statemachine(struct usb_otg *otg)
 	}
 	mutex_unlock(&fsm->lock);
 
-	VDBG("quit statemachine, changed = %d\n", fsm->state_changed);
+	dev_vdbg(otg->dev, "quit statemachine, changed = %d\n",
+		 fsm->state_changed);
 	return fsm->state_changed;
 }
 EXPORT_SYMBOL_GPL(otg_statemachine);
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 12/14] usb: hcd: Adapt to OTG core
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (10 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-08 11:42   ` Sergei Shtylyov
  2016-06-08  9:03 ` [PATCH v9 13/14] usb: gadget: udc: adapt " Roger Quadros
                   ` (2 subsequent siblings)
  14 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

Introduce usb_otg_add/remove_hcd() for use by host
controllers that are part of OTG/dual-role port.

Non Device tree platforms can use the otg_dev argument
to specify the OTG controller device. If otg_dev is NULL
then the device tree node's otg-controller property is used to
get the otg_dev device.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/core/hcd.c  | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/hcd.h |  4 ++++
 2 files changed, 59 insertions(+)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index ae6c76d..c6f4155 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -46,6 +46,11 @@
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>
 #include <linux/usb/phy.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/of.h>
+
+#include <linux/of.h>
+#include <linux/of_platform.h>
 
 #include "usb.h"
 
@@ -3025,6 +3030,56 @@ void usb_remove_hcd(struct usb_hcd *hcd)
 }
 EXPORT_SYMBOL_GPL(usb_remove_hcd);
 
+static struct otg_hcd_ops otg_hcd_intf = {
+	.add = usb_add_hcd,
+	.remove = usb_remove_hcd,
+	.usb_bus_start_enum = usb_bus_start_enum,
+	.usb_control_msg = usb_control_msg,
+	.usb_hub_find_child = usb_hub_find_child,
+};
+
+/**
+ * usb_otg_add_hcd - Register the HCD with OTG core.
+ * @hcd: the usb_hcd structure to initialize
+ * @irqnum: Interrupt line to allocate
+ * @irqflags: Interrupt type flags
+ * @otg_dev: OTG controller device managing this HCD
+ *
+ * Registers the HCD with OTG core. OTG core will call usb_add_hcd()
+ * or usb_remove_hcd() as necessary.
+ * If otg_dev is NULL then device tree node is checked for OTG
+ * controller device via the otg-controller property.
+ */
+int usb_otg_add_hcd(struct usb_hcd *hcd,
+		    unsigned int irqnum, unsigned long irqflags,
+		    struct device *otg_dev)
+{
+	struct device *dev = hcd->self.controller;
+
+	if (!otg_dev) {
+		hcd->otg_dev = of_usb_get_otg(dev->of_node);
+		if (!hcd->otg_dev)
+			return -ENODEV;
+	} else {
+		hcd->otg_dev = otg_dev;
+	}
+
+	return usb_otg_register_hcd(hcd, irqnum, irqflags, &otg_hcd_intf);
+}
+EXPORT_SYMBOL_GPL(usb_otg_add_hcd);
+
+/**
+ * usb_otg_remove_hcd - Unregister the HCD with OTG core.
+ * @hcd: the usb_hcd structure to remove
+ *
+ * Unregisters the HCD from the OTG core.
+ */
+void usb_otg_remove_hcd(struct usb_hcd *hcd)
+{
+	usb_otg_unregister_hcd(hcd);
+}
+EXPORT_SYMBOL_GPL(usb_otg_remove_hcd);
+
 void
 usb_hcd_platform_shutdown(struct platform_device *dev)
 {
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 845c761..2331b48 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -473,6 +473,10 @@ extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
 extern int usb_add_hcd(struct usb_hcd *hcd,
 		unsigned int irqnum, unsigned long irqflags);
 extern void usb_remove_hcd(struct usb_hcd *hcd);
+extern int usb_otg_add_hcd(struct usb_hcd *hcd,
+			   unsigned int irqnum, unsigned long irqflags,
+			   struct device *otg_dev);
+extern void usb_otg_remove_hcd(struct usb_hcd *hcd);
 extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
 
 struct platform_device;
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 13/14] usb: gadget: udc: adapt to OTG core
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (11 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 12/14] usb: hcd: Adapt to OTG core Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-09 10:49   ` Yoshihiro Shimoda
  2016-06-08  9:03 ` [PATCH v9 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
  2016-06-09  5:27 ` [PATCH v9 00/14] USB OTG/dual-role framework Peter Chen
  14 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

The OTG state machine needs a mechanism to start and
stop the gadget controller as well as connect/disconnect
from the bus. Add usb_gadget_start(), usb_gadget_stop()
and usb_gadget_connect_control().

Introduce usb_otg_add_gadget_udc() to allow controller drivers
to register a gadget controller that is part of an OTG instance.

Register with OTG core when UDC is added in usb_add_gadget_udc_release()
and unregister on usb_del_gadget_udc().

Notify the OTG core when gadget function driver is available on
udc_bind_to_driver() and when it is removed in usb_gadget_remove_driver().

We need to unlock the usb_lock mutex before calling
usb_otg_register_gadget() else it will cause a circular
locking dependency.

Ignore softconnect sysfs control when we're in OTG
mode as OTG FSM should care of gadget softconnect using
the b_bus_req mechanism.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/usb/gadget/udc/udc-core.c | 202 ++++++++++++++++++++++++++++++++++++--
 include/linux/usb/gadget.h        |   4 +
 2 files changed, 196 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
index 6e8300d..a80a6c9 100644
--- a/drivers/usb/gadget/udc/udc-core.c
+++ b/drivers/usb/gadget/udc/udc-core.c
@@ -28,6 +28,11 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/of.h>
+
+#include <linux/of.h>
+#include <linux/of_platform.h>
 
 /**
  * struct usb_udc - describes one usb device controller
@@ -337,6 +342,113 @@ static inline void usb_gadget_udc_stop(struct usb_udc *udc)
 }
 
 /**
+ * usb_gadget_to_udc - get the UDC owning the gadget
+ *
+ * udc_lock must be held.
+ * Returs NULL if UDC is not found.
+ */
+static struct usb_udc *usb_gadget_to_udc(struct usb_gadget *gadget)
+{
+	struct usb_udc *udc;
+
+	list_for_each_entry(udc, &udc_list, list)
+		if (udc->gadget == gadget)
+			return udc;
+
+	return NULL;
+}
+
+/**
+ * usb_gadget_start - start the usb gadget controller
+ * @gadget: the gadget device to start
+ *
+ * This is external API for use by OTG core.
+ *
+ * Start the usb device controller. Does not connect to the bus.
+ */
+static int usb_gadget_start(struct usb_gadget *gadget)
+{
+	int ret;
+	struct usb_udc *udc;
+
+	mutex_lock(&udc_lock);
+	udc = usb_gadget_to_udc(gadget);
+	if (!udc) {
+		dev_err(gadget->dev.parent, "%s: gadget not registered.\n",
+			__func__);
+		mutex_unlock(&udc_lock);
+		return -EINVAL;
+	}
+
+	ret = usb_gadget_udc_start(udc);
+	if (ret)
+		dev_err(&udc->dev, "USB Device Controller didn't start: %d\n",
+			ret);
+
+	mutex_unlock(&udc_lock);
+
+	return ret;
+}
+
+/**
+ * usb_gadget_stop - stop the usb gadget controller
+ * @gadget: the gadget device we want to stop
+ *
+ * This is external API for use by OTG core.
+ *
+ * Stop the gadget controller. Does not disconnect from the bus.
+ * Caller must ensure that gadget has disconnected from the bus
+ * before calling usb_gadget_stop().
+ */
+static int usb_gadget_stop(struct usb_gadget *gadget)
+{
+	struct usb_udc *udc;
+
+	mutex_lock(&udc_lock);
+	udc = usb_gadget_to_udc(gadget);
+	if (!udc) {
+		dev_err(gadget->dev.parent, "%s: gadget not registered.\n",
+			__func__);
+		mutex_unlock(&udc_lock);
+		return -EINVAL;
+	}
+
+	if (gadget->connected)
+		dev_dbg(gadget->dev.parent,
+			"%s: called while still connected\n", __func__);
+
+	usb_gadget_udc_stop(udc);
+	mutex_unlock(&udc_lock);
+
+	return 0;
+}
+
+static int usb_gadget_connect_control(struct usb_gadget *gadget, bool connect)
+{
+	struct usb_udc *udc;
+
+	mutex_lock(&udc_lock);
+	udc = usb_gadget_to_udc(gadget);
+	if (!udc) {
+		dev_err(gadget->dev.parent, "%s: gadget not registered.\n",
+			__func__);
+		mutex_unlock(&udc_lock);
+		return -EINVAL;
+	}
+
+	if (connect) {
+		usb_gadget_connect(udc->gadget);
+	} else {
+		usb_gadget_disconnect(udc->gadget);
+		udc->driver->disconnect(udc->gadget);
+	}
+
+	mutex_unlock(&udc_lock);
+
+	return 0;
+}
+
+/**
  * usb_udc_release - release the usb_udc struct
  * @dev: the dev member within usb_udc
  *
@@ -359,6 +471,12 @@ static void usb_udc_nop_release(struct device *dev)
 	dev_vdbg(dev, "%s\n", __func__);
 }
 
+struct otg_gadget_ops otg_gadget_intf = {
+	.start = usb_gadget_start,
+	.stop = usb_gadget_stop,
+	.connect_control = usb_gadget_connect_control,
+};
+
 /**
  * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
  * @parent: the parent device to this udc. Usually the controller driver's
@@ -414,6 +532,14 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
 	usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
 	udc->vbus = true;
 
+	if (gadget->otg_dev) {
+		mutex_unlock(&udc_lock);
+		ret = usb_otg_register_gadget(gadget, &otg_gadget_intf);
+		mutex_lock(&udc_lock);
+		if (ret)
+			goto err5;
+	}
+
 	/* pick up one of pending gadget drivers */
 	list_for_each_entry(driver, &gadget_driver_pending_list, pending) {
 		if (!driver->udc_name || strcmp(driver->udc_name,
@@ -422,7 +548,7 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
 			if (ret != -EPROBE_DEFER)
 				list_del(&driver->pending);
 			if (ret)
-				goto err4;
+				goto err5;
 			break;
 		}
 	}
@@ -431,6 +557,8 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
 
 	return 0;
 
+err5:
+	device_del(&udc->dev);
 err4:
 	list_del(&udc->list);
 	mutex_unlock(&udc_lock);
@@ -492,6 +620,33 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
 }
 EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
 
+/**
+ * usb_otg_add_gadget_udc - adds a new gadget to the udc class driver list
+ * @parent: the parent device to this udc. Usually the controller
+ * driver's device.
+ * @gadget: the gadget to be added to the list
+ * @otg_dev: the OTG controller device
+ *
+ * If otg_dev is NULL then device tree node is checked
+ * for OTG controller via the otg-controller property.
+ * Returns zero on success, negative errno otherwise.
+ */
+int usb_otg_add_gadget_udc(struct device *parent, struct usb_gadget *gadget,
+			   struct device *otg_dev)
+{
+	if (!otg_dev) {
+		gadget->otg_dev = of_usb_get_otg(parent->of_node);
+		if (!gadget->otg_dev)
+			return -ENODEV;
+	} else {
+		gadget->otg_dev = otg_dev;
+	}
+
+	return usb_add_gadget_udc_release(parent, gadget, NULL);
+}
+EXPORT_SYMBOL_GPL(usb_otg_add_gadget_udc);
+
+/* udc_lock must be held */
 static void usb_gadget_remove_driver(struct usb_udc *udc)
 {
 	dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
@@ -499,10 +654,18 @@ static void usb_gadget_remove_driver(struct usb_udc *udc)
 
 	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 
-	usb_gadget_disconnect(udc->gadget);
-	udc->driver->disconnect(udc->gadget);
+	/* If OTG/dual-role, the otg core manages UDC start/stop */
+	if (udc->gadget->otg_dev) {
+		mutex_unlock(&udc_lock);
+		usb_otg_gadget_ready(udc->gadget, false);
+		mutex_lock(&udc_lock);
+	} else {
+		usb_gadget_disconnect(udc->gadget);
+		udc->driver->disconnect(udc->gadget);
+		usb_gadget_udc_stop(udc);
+	}
+
 	udc->driver->unbind(udc->gadget);
-	usb_gadget_udc_stop(udc);
 
 	udc->driver = NULL;
 	udc->dev.driver = NULL;
@@ -536,6 +699,9 @@ void usb_del_gadget_udc(struct usb_gadget *gadget)
 	}
 	mutex_unlock(&udc_lock);
 
+	if (gadget->otg_dev)
+		usb_otg_unregister_gadget(gadget);
+
 	kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
 	flush_work(&gadget->work);
 	device_unregister(&udc->dev);
@@ -545,6 +711,7 @@ EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
 
 /* ------------------------------------------------------------------------- */
 
+/* udc_lock must be held */
 static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
 {
 	int ret;
@@ -559,17 +726,26 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
 	ret = driver->bind(udc->gadget, driver);
 	if (ret)
 		goto err1;
-	ret = usb_gadget_udc_start(udc);
-	if (ret) {
-		driver->unbind(udc->gadget);
-		goto err1;
+
+	/* If OTG/dual-role, the otg core manages UDC start/stop */
+	if (udc->gadget->otg_dev) {
+		mutex_unlock(&udc_lock);
+		usb_otg_gadget_ready(udc->gadget, true);
+		mutex_lock(&udc_lock);
+	} else {
+		ret = usb_gadget_udc_start(udc);
+		if (ret) {
+			mutex_unlock(&udc_lock);
+			driver->unbind(udc->gadget);
+			goto err1;
+		}
+		usb_udc_connect_control(udc);
 	}
-	usb_udc_connect_control(udc);
 
 	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 	return 0;
 err1:
-	if (ret != -EISNAM)
+	if ((ret != -EISNAM) && (ret != -EPROBE_DEFER))
 		dev_err(&udc->dev, "failed to start %s: %d\n",
 			udc->driver->function, ret);
 	udc->driver = NULL;
@@ -666,6 +842,12 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
 		return -EOPNOTSUPP;
 	}
 
+	/* In OTG/dual-role mode, soft-connect should be handled by OTG core */
+	if (udc->gadget->otg_dev) {
+		dev_err(dev, "soft-connect not supported in OTG mode\n");
+		return -EOPNOTSUPP;
+	}
+
 	if (sysfs_streq(buf, "connect")) {
 		usb_gadget_udc_start(udc);
 		usb_gadget_connect(udc->gadget);
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 1237f66..698092f 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -1162,6 +1162,10 @@ extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget);
 extern void usb_del_gadget_udc(struct usb_gadget *gadget);
 extern char *usb_get_gadget_udc_name(void);
 
+extern int usb_otg_add_gadget_udc(struct device *parent,
+				  struct usb_gadget *gadget,
+				  struct device *otg_dev);
+
 /*-------------------------------------------------------------------------*/
 
 /* utility to simplify dealing with string descriptors */
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 14/14] usb: host: xhci-plat: Add otg device to platform data
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (12 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 13/14] usb: gadget: udc: adapt " Roger Quadros
@ 2016-06-08  9:03 ` Roger Quadros
  2016-06-09  5:27 ` [PATCH v9 00/14] USB OTG/dual-role framework Peter Chen
  14 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-08  9:03 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, Roger Quadros

Host controllers that are part of an OTG/dual-role instance
need to somehow pass the OTG controller device information
to the HCD core.

We use platform data to pass the OTG controller device.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/host/xhci-plat.c     | 35 ++++++++++++++++++++++++++++-------
 include/linux/usb/xhci_pdriver.h |  3 +++
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 676ea45..24d030a 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -239,11 +239,20 @@ static int xhci_plat_probe(struct platform_device *pdev)
 			goto put_usb3_hcd;
 	}
 
-	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (pdata && pdata->otg_dev)
+		ret = usb_otg_add_hcd(hcd, irq, IRQF_SHARED, pdata->otg_dev);
+	else
+		ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+
 	if (ret)
 		goto disable_usb_phy;
 
-	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
+	if (pdata && pdata->otg_dev)
+		ret = usb_otg_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED,
+				      pdata->otg_dev);
+	else
+		ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
+
 	if (ret)
 		goto dealloc_usb2_hcd;
 
@@ -251,7 +260,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
 
 
 dealloc_usb2_hcd:
-	usb_remove_hcd(hcd);
+	if (pdata && pdata->otg_dev)
+		usb_otg_remove_hcd(hcd);
+	else
+		usb_remove_hcd(hcd);
 
 disable_usb_phy:
 	usb_phy_shutdown(hcd->usb_phy);
@@ -269,16 +281,25 @@ put_hcd:
 	return ret;
 }
 
-static int xhci_plat_remove(struct platform_device *dev)
+static int xhci_plat_remove(struct platform_device *pdev)
 {
-	struct usb_hcd	*hcd = platform_get_drvdata(dev);
+	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 	struct clk *clk = xhci->clk;
+	struct usb_xhci_pdata *pdata = dev_get_platdata(&pdev->dev);
+
+	if (pdata && pdata->otg_dev)
+		usb_otg_remove_hcd(xhci->shared_hcd);
+	else
+		usb_remove_hcd(xhci->shared_hcd);
 
-	usb_remove_hcd(xhci->shared_hcd);
 	usb_phy_shutdown(hcd->usb_phy);
 
-	usb_remove_hcd(hcd);
+	if (pdata && pdata->otg_dev)
+		usb_otg_remove_hcd(hcd);
+	else
+		usb_remove_hcd(hcd);
+
 	usb_put_hcd(xhci->shared_hcd);
 
 	if (!IS_ERR(clk))
diff --git a/include/linux/usb/xhci_pdriver.h b/include/linux/usb/xhci_pdriver.h
index 376654b..5c68b83 100644
--- a/include/linux/usb/xhci_pdriver.h
+++ b/include/linux/usb/xhci_pdriver.h
@@ -18,10 +18,13 @@
  *
  * @usb3_lpm_capable:	determines if this xhci platform supports USB3
  *			LPM capability
+ * @otg_dev:		OTG controller device. Only requied if part of
+ *			OTG/dual-role.
  *
  */
 struct usb_xhci_pdata {
 	unsigned	usb3_lpm_capable:1;
+	struct device	*otg_dev;
 };
 
 #endif /* __USB_CORE_XHCI_PDRIVER_H */
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 08/14] usb: otg: add OTG/dual-role core
  2016-06-08  9:03 ` [PATCH v9 08/14] usb: otg: add OTG/dual-role core Roger Quadros
@ 2016-06-08  9:53   ` Peter Chen
  2016-06-08 10:12     ` Roger Quadros
  2016-06-09  7:53   ` [PATCH v10 " Roger Quadros
  1 sibling, 1 reply; 52+ messages in thread
From: Peter Chen @ 2016-06-08  9:53 UTC (permalink / raw)
  To: Roger Quadros
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, robh, nsekhar, b-liu, linux-usb,
	linux-omap, linux-kernel, devicetree

On Wed, Jun 08, 2016 at 12:03:40PM +0300, Roger Quadros wrote:
> +int usb_otg_unregister(struct device *dev)
> +{
> +	struct usb_otg *otg;
> +
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(dev);
> +	if (!otg) {
> +		dev_err(dev, "otg: %s: device not in otg list\n",
> +			__func__);
> +		mutex_unlock(&otg_list_mutex);
> +		return -EINVAL;
> +	}
> +
> +	/* prevent unregister till both host & gadget have unregistered */
> +	if (otg->host || otg->gadget) {
> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
> +			__func__);

You need to call mutex_unlock here

> +
> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
> +{

What this API is for? Why need it in this version?

> +	struct usb_otg *otg;
> +	struct device *gadget_dev = &gadget->dev;
> +	struct device *otg_dev = gadget->otg_dev;
> +
> +	if (!otg_dev)
> +		return -EINVAL;
> +
> +	mutex_lock(&otg_list_mutex);
> +	otg = usb_otg_get_data(otg_dev);
> +	mutex_unlock(&otg_list_mutex);
> +	if (!otg) {
> +		dev_err(gadget_dev,
> +			"otg: gadget %s wasn't registered with otg\n",
> +			dev_name(&gadget->dev));
> +		return -EINVAL;
> +	}
> +
> +	mutex_lock(&otg->fsm.lock);
> +	if (otg->gadget != gadget) {
> +		mutex_unlock(&otg->fsm.lock);
> +		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
> +			dev_name(&gadget->dev));
> +		return -EINVAL;
> +	}
> +
> +	/* Start/stop FSM & gadget */
> +	otg->gadget_ready = ready;
> +	if (ready)
> +		usb_otg_start_fsm(otg);
> +	else
> +		usb_otg_stop_fsm(otg);
> +
> +	dev_dbg(otg_dev, "otg: gadget %s %sready\n", dev_name(&gadget->dev),
> +		ready ? "" : "not ");
> +
> +	mutex_unlock(&otg->fsm.lock);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_gadget_ready);
> +
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -10,10 +10,70 @@
>  #define __LINUX_USB_OTG_H
>  
>  #include <linux/phy/phy.h>
> -#include <linux/usb/phy.h>
> -#include <linux/usb/otg-fsm.h>
> +#include <linux/device.h>
> +#include <linux/hrtimer.h>
> +#include <linux/ktime.h>

The above two timer header files are not needed.

Peter
> +#include <linux/usb.h>
>  #include <linux/usb/hcd.h>
> +#include <linux/usb/gadget.h>
> +#include <linux/usb/otg-fsm.h>
> +#include <linux/usb/phy.h>
> +
> +/**
> + * struct otg_hcd - host controller state and interface
> + *
> + * @hcd: host controller
> + * @irqnum: irq number
> + * @irqflags: irq flags
> + * @ops: otg to host controller interface
> + * @ops: otg to host controller interface
> + * @otg_dev: otg controller device
> + */
> +struct otg_hcd {
> +	struct usb_hcd *hcd;
> +	unsigned int irqnum;
> +	unsigned long irqflags;
> +	struct otg_hcd_ops *ops;
> +	struct device *otg_dev;
> +};
> +
> +/**
> + * struct usb_otg_caps - describes the otg capabilities of the device
> + * @otg_rev: The OTG revision number the device is compliant with, it's
> + *		in binary-coded decimal (i.e. 2.0 is 0200H).
> + * @hnp_support: Indicates if the device supports HNP.
> + * @srp_support: Indicates if the device supports SRP.
> + * @adp_support: Indicates if the device supports ADP.
> + */
> +struct usb_otg_caps {
> +	u16 otg_rev;
> +	bool hnp_support;
> +	bool srp_support;
> +	bool adp_support;
> +};
>  
> +/**
> + * struct usb_otg - usb otg controller state
> + *
> + * @default_a: Indicates we are an A device. i.e. Host.
> + * @phy: USB phy interface
> + * @usb_phy: old usb_phy interface
> + * @host: host controller bus
> + * @gadget: gadget device
> + * @state: current otg state
> + * @dev: otg controller device
> + * @caps: otg capabilities revision, hnp, srp, etc
> + * @fsm: otg finite state machine
> + * @hcd_ops: host controller interface
> + * ------- internal use only -------
> + * @primary_hcd: primary host state and interface
> + * @shared_hcd: shared host state and interface
> + * @gadget_ops: gadget controller interface
> + * @list: list of otg controllers
> + * @work: otg state machine work
> + * @wq: otg state machine work queue
> + * @flags: to track if host/gadget is running
> + */
>  struct usb_otg {
>  	u8			default_a;
>  
> @@ -24,9 +84,25 @@ struct usb_otg {
>  	struct usb_gadget	*gadget;
>  
>  	enum usb_otg_state	state;
> +	struct device *dev;
> +	struct usb_otg_caps	caps;
>  	struct otg_fsm fsm;
>  	struct otg_hcd_ops	*hcd_ops;
>  
> +	/* internal use only */
> +	struct otg_hcd primary_hcd;
> +	struct otg_hcd shared_hcd;
> +	struct otg_gadget_ops *gadget_ops;
> +	bool gadget_ready;
> +	struct list_head list;
> +	struct work_struct work;
> +	struct workqueue_struct *wq;
> +	u32 flags;
> +#define OTG_FLAG_GADGET_RUNNING (1 << 0)
> +#define OTG_FLAG_HOST_RUNNING (1 << 1)
> +	/* use otg->fsm.lock for serializing access */
> +
> +/*------------- deprecated interface -----------------------------*/
>  	/* bind/unbind the host controller */
>  	int	(*set_host)(struct usb_otg *otg, struct usb_bus *host);
>  
> @@ -42,26 +118,101 @@ struct usb_otg {
>  
>  	/* start or continue HNP role switch */
>  	int	(*start_hnp)(struct usb_otg *otg);
> -
> +/*---------------------------------------------------------------*/
>  };
>  
>  /**
> - * struct usb_otg_caps - describes the otg capabilities of the device
> - * @otg_rev: The OTG revision number the device is compliant with, it's
> - *		in binary-coded decimal (i.e. 2.0 is 0200H).
> - * @hnp_support: Indicates if the device supports HNP.
> - * @srp_support: Indicates if the device supports SRP.
> - * @adp_support: Indicates if the device supports ADP.
> + * struct usb_otg_config - otg controller configuration
> + * @caps: otg capabilities of the controller
> + * @ops: otg fsm operations
> + * @otg_work: optional custom otg state machine work function
>   */
> -struct usb_otg_caps {
> -	u16 otg_rev;
> -	bool hnp_support;
> -	bool srp_support;
> -	bool adp_support;
> +struct usb_otg_config {
> +	struct usb_otg_caps *otg_caps;
> +	struct otg_fsm_ops *fsm_ops;
> +	void (*otg_work)(struct work_struct *work);
>  };
>  
>  extern const char *usb_otg_state_string(enum usb_otg_state state);
>  
> +#if IS_ENABLED(CONFIG_USB_OTG)
> +struct usb_otg *usb_otg_register(struct device *dev,
> +				 struct usb_otg_config *config);
> +int usb_otg_unregister(struct device *dev);
> +int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> +			 unsigned long irqflags, struct otg_hcd_ops *ops);
> +int usb_otg_unregister_hcd(struct usb_hcd *hcd);
> +int usb_otg_register_gadget(struct usb_gadget *gadget,
> +			    struct otg_gadget_ops *ops);
> +int usb_otg_unregister_gadget(struct usb_gadget *gadget);
> +void usb_otg_sync_inputs(struct usb_otg *otg);
> +int usb_otg_kick_fsm(struct device *otg_dev);
> +int usb_otg_start_host(struct usb_otg *otg, int on);
> +int usb_otg_start_gadget(struct usb_otg *otg, int on);
> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready);
> +
> +#else /* CONFIG_USB_OTG */
> +
> +static inline struct usb_otg *usb_otg_register(struct device *dev,
> +					       struct usb_otg_config *config)
> +{
> +	return ERR_PTR(-ENOTSUPP);
> +}
> +
> +static inline int usb_otg_unregister(struct device *dev)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> +				       unsigned long irqflags,
> +				       struct otg_hcd_ops *ops)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline int usb_otg_unregister_hcd(struct usb_hcd *hcd)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline int usb_otg_register_gadget(struct usb_gadget *gadget,
> +					  struct otg_gadget_ops *ops)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline int usb_otg_unregister_gadget(struct usb_gadget *gadget)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline void usb_otg_sync_inputs(struct usb_otg *otg)
> +{
> +}
> +
> +static inline int usb_otg_kick_fsm(struct device *otg_dev)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline int usb_otg_start_host(struct usb_otg *otg, int on)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline int usb_otg_start_gadget(struct usb_otg *otg, int on)
> +{
> +	return -ENOTSUPP;
> +}
> +
> +static inline int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
> +{
> +	return -ENOTSUPP;
> +}
> +#endif /* CONFIG_USB_OTG */
> +
> +/*------------- deprecated interface -----------------------------*/
>  /* Context: can sleep */
>  static inline int
>  otg_start_hnp(struct usb_otg *otg)
> @@ -113,6 +264,8 @@ otg_start_srp(struct usb_otg *otg)
>  	return -ENOTSUPP;
>  }
>  
> +/*---------------------------------------------------------------*/
> +
>  /* for OTG controller drivers (and maybe other stuff) */
>  extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
>  
> @@ -237,4 +390,6 @@ static inline int otg_start_gadget(struct usb_otg *otg, int on)
>  	return otg->fsm.ops->start_gadget(otg, on);
>  }
>  
> +int drd_statemachine(struct usb_otg *otg);
> +
>  #endif /* __LINUX_USB_OTG_H */
> -- 
> 2.7.4
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 

Best Regards,
Peter Chen

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 08/14] usb: otg: add OTG/dual-role core
  2016-06-08  9:53   ` Peter Chen
@ 2016-06-08 10:12     ` Roger Quadros
  2016-06-08 12:42       ` Peter Chen
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-08 10:12 UTC (permalink / raw)
  To: Peter Chen
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, robh, nsekhar, b-liu, linux-usb,
	linux-omap, linux-kernel, devicetree

Hi,

On 08/06/16 12:53, Peter Chen wrote:
> On Wed, Jun 08, 2016 at 12:03:40PM +0300, Roger Quadros wrote:
>> +int usb_otg_unregister(struct device *dev)
>> +{
>> +	struct usb_otg *otg;
>> +
>> +	mutex_lock(&otg_list_mutex);
>> +	otg = usb_otg_get_data(dev);
>> +	if (!otg) {
>> +		dev_err(dev, "otg: %s: device not in otg list\n",
>> +			__func__);
>> +		mutex_unlock(&otg_list_mutex);
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* prevent unregister till both host & gadget have unregistered */
>> +	if (otg->host || otg->gadget) {
>> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
>> +			__func__);
> 
> You need to call mutex_unlock here

Indeed. good catch.
> 
>> +
>> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
>> +{
> 
> What this API is for? Why need it in this version?

we moved gadget to otg registration from udc_bind_to_driver() to usb_add_gadget_udc_release().
This means there is a window when gadget function driver (e.g. g_zero) is not loaded.
We don't want to start the gadget controller in that window.

usb_otg_gadget_ready() is used by gadget core to notify the otg core when the function driver
is ready or not-ready.

> 
>> +	struct usb_otg *otg;
>> +	struct device *gadget_dev = &gadget->dev;
>> +	struct device *otg_dev = gadget->otg_dev;
>> +
>> +	if (!otg_dev)
>> +		return -EINVAL;
>> +
>> +	mutex_lock(&otg_list_mutex);
>> +	otg = usb_otg_get_data(otg_dev);
>> +	mutex_unlock(&otg_list_mutex);
>> +	if (!otg) {
>> +		dev_err(gadget_dev,
>> +			"otg: gadget %s wasn't registered with otg\n",
>> +			dev_name(&gadget->dev));
>> +		return -EINVAL;
>> +	}
>> +
>> +	mutex_lock(&otg->fsm.lock);
>> +	if (otg->gadget != gadget) {
>> +		mutex_unlock(&otg->fsm.lock);
>> +		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
>> +			dev_name(&gadget->dev));
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* Start/stop FSM & gadget */
>> +	otg->gadget_ready = ready;
>> +	if (ready)
>> +		usb_otg_start_fsm(otg);
>> +	else
>> +		usb_otg_stop_fsm(otg);
>> +
>> +	dev_dbg(otg_dev, "otg: gadget %s %sready\n", dev_name(&gadget->dev),
>> +		ready ? "" : "not ");
>> +
>> +	mutex_unlock(&otg->fsm.lock);
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(usb_otg_gadget_ready);
>> +
>> --- a/include/linux/usb/otg.h
>> +++ b/include/linux/usb/otg.h
>> @@ -10,10 +10,70 @@
>>  #define __LINUX_USB_OTG_H
>>  
>>  #include <linux/phy/phy.h>
>> -#include <linux/usb/phy.h>
>> -#include <linux/usb/otg-fsm.h>
>> +#include <linux/device.h>
>> +#include <linux/hrtimer.h>
>> +#include <linux/ktime.h>
> 
> The above two timer header files are not needed.

You had pointed this out earlier, but I missed it. Sorry.

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-08  9:03 ` [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
@ 2016-06-08 11:39   ` Sergei Shtylyov
  2016-06-08 12:04     ` Roger Quadros
  2016-06-09  7:51   ` [PATCH v10 " Roger Quadros
  1 sibling, 1 reply; 52+ messages in thread
From: Sergei Shtylyov @ 2016-06-08 11:39 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

Hello.

On 6/8/2016 12:03 PM, Roger Quadros wrote:

> The OTG core will use struct otg_hcd_ops to interface
> with the HCD controller.

    Host controller driver (HCD) controller? Maybe just HC? :-)

> The main purpose of this interface is to avoid directly
> calling HCD APIs from the OTG core as they
> wouldn't be defined in the built-in symbol table if
> CONFIG_USB is m.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Acked-by: Peter Chen <peter.chen@nxp.com>
> ---
>  include/linux/usb/hcd.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> index 66fc137..7914bed 100644
> --- a/include/linux/usb/hcd.h
> +++ b/include/linux/usb/hcd.h
> @@ -400,6 +400,30 @@ struct hc_driver {
>
>  };
>
> +/**
> + * struct otg_hcd_ops - Interface between OTG core and HCD
> + *
> + * Provided by the HCD core to allow the OTG core to interface with the HCD
> + *
> + * @add: function to add the HCD
> + * @remove: function to remove the HCD
> + * @usb_bus_start_enum: function to immediately start bus enumeration
> + * @usb_control_msg: function to build and send of a control urb

    That "of" is not needed. And it's URB.

[...]

MBR, Sergei

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 12/14] usb: hcd: Adapt to OTG core
  2016-06-08  9:03 ` [PATCH v9 12/14] usb: hcd: Adapt to OTG core Roger Quadros
@ 2016-06-08 11:42   ` Sergei Shtylyov
  2016-06-08 12:06     ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Sergei Shtylyov @ 2016-06-08 11:42 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 6/8/2016 12:03 PM, Roger Quadros wrote:

> Introduce usb_otg_add/remove_hcd() for use by host
> controllers that are part of OTG/dual-role port.
>
> Non Device tree platforms can use the otg_dev argument
> to specify the OTG controller device. If otg_dev is NULL
> then the device tree node's otg-controller property is used to
> get the otg_dev device.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Acked-by: Peter Chen <peter.chen@nxp.com>
> ---
>  drivers/usb/core/hcd.c  | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/usb/hcd.h |  4 ++++
>  2 files changed, 59 insertions(+)
>
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index ae6c76d..c6f4155 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
[...]
> @@ -3025,6 +3030,56 @@ void usb_remove_hcd(struct usb_hcd *hcd)
>  }
>  EXPORT_SYMBOL_GPL(usb_remove_hcd);
>
> +static struct otg_hcd_ops otg_hcd_intf = {
> +	.add = usb_add_hcd,
> +	.remove = usb_remove_hcd,
> +	.usb_bus_start_enum = usb_bus_start_enum,
> +	.usb_control_msg = usb_control_msg,
> +	.usb_hub_find_child = usb_hub_find_child,
> +};
> +
> +/**
> + * usb_otg_add_hcd - Register the HCD with OTG core.
> + * @hcd: the usb_hcd structure to initialize
> + * @irqnum: Interrupt line to allocate
> + * @irqflags: Interrupt type flags
> + * @otg_dev: OTG controller device managing this HCD

    Device managing a driver? That's interesting. :-)

[...]

MBR, Sergei

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-08 11:39   ` Sergei Shtylyov
@ 2016-06-08 12:04     ` Roger Quadros
  2016-06-08 12:10       ` Sergei Shtylyov
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-08 12:04 UTC (permalink / raw)
  To: Sergei Shtylyov, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

Hi,

On 08/06/16 14:39, Sergei Shtylyov wrote:
> Hello.
> 
> On 6/8/2016 12:03 PM, Roger Quadros wrote:
> 
>> The OTG core will use struct otg_hcd_ops to interface
>> with the HCD controller.
> 
>    Host controller driver (HCD) controller? Maybe just HC? :-)

OK.

> 
>> The main purpose of this interface is to avoid directly
>> calling HCD APIs from the OTG core as they
>> wouldn't be defined in the built-in symbol table if
>> CONFIG_USB is m.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> Acked-by: Peter Chen <peter.chen@nxp.com>
>> ---
>>  include/linux/usb/hcd.h | 24 ++++++++++++++++++++++++
>>  1 file changed, 24 insertions(+)
>>
>> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
>> index 66fc137..7914bed 100644
>> --- a/include/linux/usb/hcd.h
>> +++ b/include/linux/usb/hcd.h
>> @@ -400,6 +400,30 @@ struct hc_driver {
>>
>>  };
>>
>> +/**
>> + * struct otg_hcd_ops - Interface between OTG core and HCD
>> + *
>> + * Provided by the HCD core to allow the OTG core to interface with the HCD
>> + *
>> + * @add: function to add the HCD
>> + * @remove: function to remove the HCD
>> + * @usb_bus_start_enum: function to immediately start bus enumeration
>> + * @usb_control_msg: function to build and send of a control urb
> 
>    That "of" is not needed. And it's URB.

Right.
> 
> [...]
> 

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 12/14] usb: hcd: Adapt to OTG core
  2016-06-08 11:42   ` Sergei Shtylyov
@ 2016-06-08 12:06     ` Roger Quadros
  2016-06-08 12:11       ` Sergei Shtylyov
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-08 12:06 UTC (permalink / raw)
  To: Sergei Shtylyov, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 08/06/16 14:42, Sergei Shtylyov wrote:
> On 6/8/2016 12:03 PM, Roger Quadros wrote:
> 
>> Introduce usb_otg_add/remove_hcd() for use by host
>> controllers that are part of OTG/dual-role port.
>>
>> Non Device tree platforms can use the otg_dev argument
>> to specify the OTG controller device. If otg_dev is NULL
>> then the device tree node's otg-controller property is used to
>> get the otg_dev device.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> Acked-by: Peter Chen <peter.chen@nxp.com>
>> ---
>>  drivers/usb/core/hcd.c  | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
>>  include/linux/usb/hcd.h |  4 ++++
>>  2 files changed, 59 insertions(+)
>>
>> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
>> index ae6c76d..c6f4155 100644
>> --- a/drivers/usb/core/hcd.c
>> +++ b/drivers/usb/core/hcd.c
> [...]
>> @@ -3025,6 +3030,56 @@ void usb_remove_hcd(struct usb_hcd *hcd)
>>  }
>>  EXPORT_SYMBOL_GPL(usb_remove_hcd);
>>
>> +static struct otg_hcd_ops otg_hcd_intf = {
>> +    .add = usb_add_hcd,
>> +    .remove = usb_remove_hcd,
>> +    .usb_bus_start_enum = usb_bus_start_enum,
>> +    .usb_control_msg = usb_control_msg,
>> +    .usb_hub_find_child = usb_hub_find_child,
>> +};
>> +
>> +/**
>> + * usb_otg_add_hcd - Register the HCD with OTG core.
>> + * @hcd: the usb_hcd structure to initialize
>> + * @irqnum: Interrupt line to allocate
>> + * @irqflags: Interrupt type flags
>> + * @otg_dev: OTG controller device managing this HCD
> 
>    Device managing a driver? That's interesting. :-)

Well it is the OTG controller instance really.
How else do you want me to write it?

cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-08 12:04     ` Roger Quadros
@ 2016-06-08 12:10       ` Sergei Shtylyov
  2016-06-09  7:31         ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Sergei Shtylyov @ 2016-06-08 12:10 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 6/8/2016 3:04 PM, Roger Quadros wrote:

>>> The OTG core will use struct otg_hcd_ops to interface
>>> with the HCD controller.
>>
>>    Host controller driver (HCD) controller? Maybe just HC? :-)
>
> OK.

    OTOH, my googling has shown that HCD may stand for both HC driver and HC 
device... The host controller device sounds a bit tautological however...

[...]

> --
> cheers,
> -roger

MBR, Sergei

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 12/14] usb: hcd: Adapt to OTG core
  2016-06-08 12:06     ` Roger Quadros
@ 2016-06-08 12:11       ` Sergei Shtylyov
  2016-06-09  7:27         ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Sergei Shtylyov @ 2016-06-08 12:11 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 6/8/2016 3:06 PM, Roger Quadros wrote:

>>> Introduce usb_otg_add/remove_hcd() for use by host
>>> controllers that are part of OTG/dual-role port.
>>>
>>> Non Device tree platforms can use the otg_dev argument
>>> to specify the OTG controller device. If otg_dev is NULL
>>> then the device tree node's otg-controller property is used to
>>> get the otg_dev device.
>>>
>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>> Acked-by: Peter Chen <peter.chen@nxp.com>
>>> ---
>>>  drivers/usb/core/hcd.c  | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
>>>  include/linux/usb/hcd.h |  4 ++++
>>>  2 files changed, 59 insertions(+)
>>>
>>> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
>>> index ae6c76d..c6f4155 100644
>>> --- a/drivers/usb/core/hcd.c
>>> +++ b/drivers/usb/core/hcd.c
>> [...]
>>> @@ -3025,6 +3030,56 @@ void usb_remove_hcd(struct usb_hcd *hcd)
>>>  }
>>>  EXPORT_SYMBOL_GPL(usb_remove_hcd);
>>>
>>> +static struct otg_hcd_ops otg_hcd_intf = {
>>> +    .add = usb_add_hcd,
>>> +    .remove = usb_remove_hcd,
>>> +    .usb_bus_start_enum = usb_bus_start_enum,
>>> +    .usb_control_msg = usb_control_msg,
>>> +    .usb_hub_find_child = usb_hub_find_child,
>>> +};
>>> +
>>> +/**
>>> + * usb_otg_add_hcd - Register the HCD with OTG core.
>>> + * @hcd: the usb_hcd structure to initialize
>>> + * @irqnum: Interrupt line to allocate
>>> + * @irqflags: Interrupt type flags
>>> + * @otg_dev: OTG controller device managing this HCD
>>
>>    Device managing a driver? That's interesting. :-)
>
> Well it is the OTG controller instance really.
> How else do you want me to write it?

   Just HC again? Or maybe HCI (HC interface)?

> cheers,
> -roger

MBR, Sergei

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 08/14] usb: otg: add OTG/dual-role core
  2016-06-08 10:12     ` Roger Quadros
@ 2016-06-08 12:42       ` Peter Chen
  2016-06-09  7:24         ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Peter Chen @ 2016-06-08 12:42 UTC (permalink / raw)
  To: Roger Quadros
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, robh, nsekhar, b-liu, linux-usb,
	linux-omap, linux-kernel, devicetree

On Wed, Jun 08, 2016 at 01:12:10PM +0300, Roger Quadros wrote:
> Hi,
> 
> On 08/06/16 12:53, Peter Chen wrote:
> > On Wed, Jun 08, 2016 at 12:03:40PM +0300, Roger Quadros wrote:
> >> +int usb_otg_unregister(struct device *dev)
> >> +{
> >> +	struct usb_otg *otg;
> >> +
> >> +	mutex_lock(&otg_list_mutex);
> >> +	otg = usb_otg_get_data(dev);
> >> +	if (!otg) {
> >> +		dev_err(dev, "otg: %s: device not in otg list\n",
> >> +			__func__);
> >> +		mutex_unlock(&otg_list_mutex);
> >> +		return -EINVAL;
> >> +	}
> >> +
> >> +	/* prevent unregister till both host & gadget have unregistered */
> >> +	if (otg->host || otg->gadget) {
> >> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
> >> +			__func__);
> > 
> > You need to call mutex_unlock here
> 
> Indeed. good catch.
> > 
> >> +
> >> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
> >> +{
> > 
> > What this API is for? Why need it in this version?
> 
> we moved gadget to otg registration from udc_bind_to_driver() to usb_add_gadget_udc_release().
> This means there is a window when gadget function driver (e.g. g_zero) is not loaded.
> We don't want to start the gadget controller in that window.
> 
> usb_otg_gadget_ready() is used by gadget core to notify the otg core when the function driver
> is ready or not-ready.
> 

Why you need to move this from gadget's probe to udc's probe? Currently,
the sequence of gadget and udc's probe is random, but udc_bind_to_driver
is called when udc is ready.

-- 

Best Regards,
Peter Chen

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG()
  2016-06-08  9:03 ` [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
@ 2016-06-08 15:10   ` Joe Perches
  2016-06-09  7:25     ` Roger Quadros
  2016-06-09  7:55   ` [PATCH v10 " Roger Quadros
  1 sibling, 1 reply; 52+ messages in thread
From: Joe Perches @ 2016-06-08 15:10 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree

On Wed, 2016-06-08 at 12:03 +0300, Roger Quadros wrote:
> Now that we have a device reference in struct usb_otg
> let's use dev_dbg() for debug messages.

dev_vdbg vs dev_dbg

The patch subject and commit message don't match the code changes.

> diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
[]
> @@ -44,8 +37,9 @@ static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
>  	int ret = 0;
>  
>  	if (fsm->protocol != protocol) {
> -		VDBG("Changing role fsm->protocol= %d; new protocol= %d\n",
> -			fsm->protocol, protocol);
> +		dev_vdbg(otg->dev,
> +			 "Changing role fsm->protocol= %d; new protocol= %d\n",
> +			 fsm->protocol, protocol);

etc...

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 00/14] USB OTG/dual-role framework
  2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
                   ` (13 preceding siblings ...)
  2016-06-08  9:03 ` [PATCH v9 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
@ 2016-06-09  5:27 ` Peter Chen
  2016-06-09  7:30   ` Roger Quadros
  14 siblings, 1 reply; 52+ messages in thread
From: Peter Chen @ 2016-06-09  5:27 UTC (permalink / raw)
  To: Roger Quadros
  Cc: Peter Chen, balbi, tony, Greg Kroah-Hartman, dan.j.williams,
	mathias.nyman, Joao.Pinto, sergei.shtylyov, jun.li,
	grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar, b-liu,
	linux-usb, linux-omap, lkml, devicetree

On Wed, Jun 8, 2016 at 5:03 PM, Roger Quadros <rogerq@ti.com> wrote:
> Hi,
>
> This series centralizes OTG/Dual-role functionality in the kernel.
> As of now I've got Dual-role functionality working pretty reliably on
> dra7-evm and am437x-gp-evm.
>
> DWC3 controller and TI platform related patches will be sent separately.
>
> Series is based on v4.7-rc1.
>

Roger, I will wait your dwc3 and TI patch set since one framework needs
one user at least, thanks.

Peter
> Why?:
> ----
>
> Currently there is no central location where OTG/dual-role functionality is
> implemented in the Linux USB stack and every USB controller driver is
> doing their own thing for OTG/dual-role. We can benefit from code-reuse
> and simplicity by adding the OTG/dual-role core driver.
>
> Newer OTG cores support standard host interface (e.g. xHCI) so
> host and gadget functionality are no longer closely knit like older
> cores. There needs to be a way to co-ordinate the operation of the
> host and gadget controllers in dual-role mode. i.e. to stop and start them
> from a central location. This central location should be the
> USB OTG/dual-role core.
>
> Host and gadget controllers might be sharing resources and can't
> be always running. One has to be stopped for the other to run.
> This couldn't be done till now but can be done from the OTG core.
>
> What?:
> -----
>
> The OTG/dual-role core consists of a set of APIs that allow
> registration of OTG controller device and OTG capable host and gadget
> controllers.
>
> - The OTG controller driver can provide the OTG capabilities and the
> Finite State Machine work function via 'struct usb_otg_config'
> at the time of registration i.e. usb_otg_register();
>
>         struct usb_otg *usb_otg_register(struct device *dev,
>                                          struct usb_otg_config *config);
>         int usb_otg_unregister(struct device *dev);
>         /**
>          * struct usb_otg_config - otg controller configuration
>          * @caps: otg capabilities of the controller
>          * @ops: otg fsm operations
>          * @otg_work: optional custom otg state machine work function
>          */
>         struct usb_otg_config {
>                 struct usb_otg_caps *otg_caps;
>                 struct otg_fsm_ops *fsm_ops;
>                 void (*otg_work)(struct work_struct *work);
>         };
>
> The dual-role state machine is built-into the OTG core so nothing
> special needs to be provided if only dual-role functionality is desired.
> The low level OTG controller driver ops are povided via
> 'struct otg_fsm_ops *fsm_ops' in the 'struct usb_otg_config'.
>
> After registration, the OTG core waits for host, gadget controller
> and the gadget function driver to be registered. Once all resources are
> available it instantiates the Finite State Machine (FSM).
> The host/gadget controllers are started/stopped according to the FSM.
>
> - Host and gadget controllers that are a part of OTG/dual-role port must
> use the OTG core provided APIs to add/remove the host/gadget.
> i.e. hosts must use usb_otg_add_hcd() usb_otg_remove_hcd(),,
> gadgets must use usb_otg_add_gadget_udc() usb_del_gadget_udc().
> This ensures that the host and gadget controllers are not started till
> the state machine is ready and the right bus conditions are met.
> It also allows the host and gadget controllers to provide the OTG
> controller device to link them together. For Device tree boots
> the related OTG controller is automatically picked up via the
> 'otg-controller' property in the Host/Gadget controller nodes.
>
>         int usb_otg_add_hcd(struct usb_hcd *hcd,
>                             unsigned int irqnum, unsigned long irqflags,
>                             struct device *otg_dev);
>         void usb_otg_remove_hcd(struct usb_hcd *hcd);
>
>         int usb_otg_add_gadget_udc(struct device *parent,
>                                    struct usb_gadget *gadget,
>                                    struct device *otg_dev);
>         usb_del_gadget_udc() must be used for removal.
>
>
> - During the lifetime of the FSM, the OTG controller driver can provide
> inputs event changes using usb_otg_sync_inputs(). The OTG core will
> then schedule the FSM work function (or internal dual-role state machine)
> to update the FSM state. The FSM then calls the OTG controller
> operations (fsm_ops) as necessary.
>         void usb_otg_sync_inputs(struct usb_otg *otg);
>
> - The following 2 functions are provided as helpers for use by the
> OTG controller driver to start/stop the host/gadget controllers.
>         int usb_otg_start_host(struct usb_otg *otg, int on);
>         int usb_otg_start_gadget(struct usb_otg *otg, int on);
>
> - The following function is provided for use by the USB host stack
> to sync OTG related events to the OTG state machine.
> e.g. change in host_bus->b_hnp_enable, gadget->b_hnp_enable
>         int usb_otg_kick_fsm(struct device *otg_device);
>
> - The following function is provided for use by the USB gadget stack
> to notify OTG/DRD about gadget function driver being ready/not-ready
>         int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
>
> Changelog:
> ---------
> v9:
> - In the DT bindings, clearly indicate which properties are for OTG controller
> and which ones are for host/device controllers
> - Removed host/gadget wait list from otg core. Use defer probing if host/gadget
> registers before dual-role/otg controller.
> - move gadget registering to otg core from udc_bind_to_driver()/usb_gadget_remove_driver()
> to usb_add_gadget_udc_release()/usb_del_gadget_udc(). This means that we need
> an additional mechanism to know when the gadget function driver registers.
> So we add usb_otg_gadget_ready() API to allow gadget to notify otg core about
> ready/not-ready function driver.
> - update otg->caps based on capabilities provided by the controller and the
> device tree overrides.
> - in usb_drd_work() we must keep calling the drd_statemachine() as long as
> there is a state change.
> - updated kconfig so that usbotg can be a module when both host and gadget
> are modules.
> - rebased on v4.7-rc1
>
> v8:
> - split out start/stop gadget and connect/disconnect operations.
> - make CONFIG_OTG dpend on CONFIG_USB_GADGET as well apart from CONFIG_USB
> - use create_freezable_workqueue() for OTG work as per Peter's suggestion.
> - remove usb-otg.h as we're not initializing any OTG timers.
> - don't include unnecessary headers in usb-otg.c (i.e. hrtimer.h & ktime.h)
>
> v7:
> - added dual-role support for host controllers requiring a companion
> controller. e.g. EHCI + OHCI.
> - added of_usb_get_otg() to get the OTG controller device
> from the USB controller's device node.
> - addressed review comments.
>
> v6:
> - added otg specific APIs for host/gadget registration. behaviour of
> original host/gadget API remains unchanged. Platform devices can now
> pass the otg device explicitly while registering host/gadget.
> - moved hcd specific operations from struct otg_fsm to struct hcd_ops.
> - made struct usb_otg mandatory for all otg related APIs.
> - allow otg controller to provide it's own otg_work function so that
> it can implement it's own state machine.
> - removed otg fsm and timers from usb-otg.c. Only dual-role state machine
> is implemented.
> - vbus is controlled in the dual-role state machine.
> - PM runtime is used around drd_statemachine().
> - added otg_dev to xhci platform data to allow platform code to specify
> the otg controller tied to the xhci host controller.
>
> v5: Internal version. Not sent to mailing list
>
> v4:
> - Added DT support for tying otg-controller to host and gadget
>  controllers. For DT we no longer have the constraint that
>  OTG controller needs to be parent of host and gadget. They can be
>  tied together using the "otg-controller" property.
> - Relax the requirement for DT case that otg controller must register
>  before host/gadget. We maintain a wait list of host/gadget devices
>  waiting on the otg controller.
> - Use a single struct usb_otg for otg data.
> - Don't override host/gadget start/stop APIs. Let the controller
>  drivers do what they want as they know best. Helper API is provided
>  for controller start/stop that controller driver can use.
> - Introduce struct usb_otg_config to pass the otg capabilities,
>  otg ops and otg timer timeouts during otg controller registration.
> - rebased on Greg's usb.git/usb-next
>
> v3:
> - all otg related definations now in otg.h
> - single kernel config USB_OTG to enable OTG core and FSM.
> - resolved symbol dependency issues.
> - use dev_vdbg instead of VDBG() in usb-otg-fsm.c
> - rebased on v4.2-rc1
>
> v2:
> - Use add/remove_hcd() instead of start/stop_hcd() to enable/disable
>  the host controller
> - added dual-role-device (DRD) state machine which is a much simpler
>  mode of operation when compared to OTG. Here we don't support fancy
>  OTG features like HNP, SRP, on the fly role-swap. The mode of operation
>  is determined based on ID pin (cable type) and the role doesn't change
>  till the cable type changes.
>
> --
> cheers,
> -roger
>
> Roger Quadros (13):
>   usb: hcd: Initialize hcd->flags to 0
>   usb: otg-fsm: Prevent build warning "VDBG" redefined
>   usb: hcd.h: Add OTG to HCD interface
>   usb: otg-fsm: use usb_otg wherever possible
>   usb: otg-fsm: move host controller operations into usb_otg->hcd_ops
>   usb: gadget.h: Add OTG to gadget interface
>   usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG
>   usb: otg: add OTG/dual-role core
>   usb: of: add an API to get OTG device from USB controller node
>   usb: otg: use dev_dbg() instead of VDBG()
>   usb: hcd: Adapt to OTG core
>   usb: gadget: udc: adapt to OTG core
>   usb: host: xhci-plat: Add otg device to platform data
>
> Yoshihiro Shimoda (1):
>   usb: otg: add hcd companion support
>
>  Documentation/devicetree/bindings/usb/generic.txt |   6 +
>  Documentation/usb/chipidea.txt                    |   2 +-
>  drivers/usb/Kconfig                               |  18 +
>  drivers/usb/Makefile                              |   1 +
>  drivers/usb/chipidea/Makefile                     |   2 +-
>  drivers/usb/chipidea/ci.h                         |   3 +-
>  drivers/usb/chipidea/core.c                       |  14 +-
>  drivers/usb/chipidea/debug.c                      |   2 +-
>  drivers/usb/chipidea/otg_fsm.c                    | 176 ++---
>  drivers/usb/chipidea/otg_fsm.h                    |   2 +-
>  drivers/usb/chipidea/udc.c                        |  17 +-
>  drivers/usb/common/Makefile                       |   5 +-
>  drivers/usb/common/common.c                       |  27 +
>  drivers/usb/common/usb-otg-fsm.c                  | 203 +++---
>  drivers/usb/common/usb-otg.c                      | 846 ++++++++++++++++++++++
>  drivers/usb/core/Kconfig                          |  22 -
>  drivers/usb/core/hcd.c                            |  56 ++
>  drivers/usb/gadget/Kconfig                        |   1 +
>  drivers/usb/gadget/udc/udc-core.c                 | 202 +++++-
>  drivers/usb/host/xhci-plat.c                      |  35 +-
>  drivers/usb/phy/Kconfig                           |   2 +-
>  drivers/usb/phy/phy-fsl-usb.c                     | 155 ++--
>  drivers/usb/phy/phy-fsl-usb.h                     |   3 +-
>  include/linux/usb/gadget.h                        |  22 +
>  include/linux/usb/hcd.h                           |  29 +
>  include/linux/usb/of.h                            |   9 +
>  include/linux/usb/otg-fsm.h                       | 154 +---
>  include/linux/usb/otg.h                           | 293 +++++++-
>  include/linux/usb/xhci_pdriver.h                  |   3 +
>  29 files changed, 1848 insertions(+), 462 deletions(-)
>  create mode 100644 drivers/usb/common/usb-otg.c
>
> --
> 2.7.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 08/14] usb: otg: add OTG/dual-role core
  2016-06-08 12:42       ` Peter Chen
@ 2016-06-09  7:24         ` Roger Quadros
  2016-06-12  6:26           ` Peter Chen
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:24 UTC (permalink / raw)
  To: Peter Chen
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, robh, nsekhar, b-liu, linux-usb,
	linux-omap, linux-kernel, devicetree

On 08/06/16 15:42, Peter Chen wrote:
> On Wed, Jun 08, 2016 at 01:12:10PM +0300, Roger Quadros wrote:
>> Hi,
>>
>> On 08/06/16 12:53, Peter Chen wrote:
>>> On Wed, Jun 08, 2016 at 12:03:40PM +0300, Roger Quadros wrote:
>>>> +int usb_otg_unregister(struct device *dev)
>>>> +{
>>>> +	struct usb_otg *otg;
>>>> +
>>>> +	mutex_lock(&otg_list_mutex);
>>>> +	otg = usb_otg_get_data(dev);
>>>> +	if (!otg) {
>>>> +		dev_err(dev, "otg: %s: device not in otg list\n",
>>>> +			__func__);
>>>> +		mutex_unlock(&otg_list_mutex);
>>>> +		return -EINVAL;
>>>> +	}
>>>> +
>>>> +	/* prevent unregister till both host & gadget have unregistered */
>>>> +	if (otg->host || otg->gadget) {
>>>> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
>>>> +			__func__);
>>>
>>> You need to call mutex_unlock here
>>
>> Indeed. good catch.
>>>
>>>> +
>>>> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
>>>> +{
>>>
>>> What this API is for? Why need it in this version?
>>
>> we moved gadget to otg registration from udc_bind_to_driver() to usb_add_gadget_udc_release().
>> This means there is a window when gadget function driver (e.g. g_zero) is not loaded.
>> We don't want to start the gadget controller in that window.
>>
>> usb_otg_gadget_ready() is used by gadget core to notify the otg core when the function driver
>> is ready or not-ready.
>>
> 
> Why you need to move this from gadget's probe to udc's probe? Currently,
> the sequence of gadget and udc's probe is random, but udc_bind_to_driver
> is called when udc is ready.
> 
Because we need to support -EPROBE_DEFER at udc probe.
At udc_bind_to_driver there is no scope for -EPROBE_DEFER.

Another issue is that we need to register with otg and have otg->caps available
before driver->bind() is called in udc_bind_to_driver(). Else gadget function
will not have the correct OTG descriptor.

cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG()
  2016-06-08 15:10   ` Joe Perches
@ 2016-06-09  7:25     ` Roger Quadros
  0 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:25 UTC (permalink / raw)
  To: Joe Perches, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree

On 08/06/16 18:10, Joe Perches wrote:
> On Wed, 2016-06-08 at 12:03 +0300, Roger Quadros wrote:
>> Now that we have a device reference in struct usb_otg
>> let's use dev_dbg() for debug messages.
> 
> dev_vdbg vs dev_dbg
> 
> The patch subject and commit message don't match the code changes.

Indeed. Will fix it. Thanks.

> 
>> diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
> []
>> @@ -44,8 +37,9 @@ static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
>>  	int ret = 0;
>>  
>>  	if (fsm->protocol != protocol) {
>> -		VDBG("Changing role fsm->protocol= %d; new protocol= %d\n",
>> -			fsm->protocol, protocol);
>> +		dev_vdbg(otg->dev,
>> +			 "Changing role fsm->protocol= %d; new protocol= %d\n",
>> +			 fsm->protocol, protocol);
> 
> etc...
> 

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 12/14] usb: hcd: Adapt to OTG core
  2016-06-08 12:11       ` Sergei Shtylyov
@ 2016-06-09  7:27         ` Roger Quadros
  0 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:27 UTC (permalink / raw)
  To: Sergei Shtylyov, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 08/06/16 15:11, Sergei Shtylyov wrote:
> On 6/8/2016 3:06 PM, Roger Quadros wrote:
> 
>>>> Introduce usb_otg_add/remove_hcd() for use by host
>>>> controllers that are part of OTG/dual-role port.
>>>>
>>>> Non Device tree platforms can use the otg_dev argument
>>>> to specify the OTG controller device. If otg_dev is NULL
>>>> then the device tree node's otg-controller property is used to
>>>> get the otg_dev device.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>>> Acked-by: Peter Chen <peter.chen@nxp.com>
>>>> ---
>>>>  drivers/usb/core/hcd.c  | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
>>>>  include/linux/usb/hcd.h |  4 ++++
>>>>  2 files changed, 59 insertions(+)
>>>>
>>>> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
>>>> index ae6c76d..c6f4155 100644
>>>> --- a/drivers/usb/core/hcd.c
>>>> +++ b/drivers/usb/core/hcd.c
>>> [...]
>>>> @@ -3025,6 +3030,56 @@ void usb_remove_hcd(struct usb_hcd *hcd)
>>>>  }
>>>>  EXPORT_SYMBOL_GPL(usb_remove_hcd);
>>>>
>>>> +static struct otg_hcd_ops otg_hcd_intf = {
>>>> +    .add = usb_add_hcd,
>>>> +    .remove = usb_remove_hcd,
>>>> +    .usb_bus_start_enum = usb_bus_start_enum,
>>>> +    .usb_control_msg = usb_control_msg,
>>>> +    .usb_hub_find_child = usb_hub_find_child,
>>>> +};
>>>> +
>>>> +/**
>>>> + * usb_otg_add_hcd - Register the HCD with OTG core.
>>>> + * @hcd: the usb_hcd structure to initialize
>>>> + * @irqnum: Interrupt line to allocate
>>>> + * @irqflags: Interrupt type flags
>>>> + * @otg_dev: OTG controller device managing this HCD
>>>
>>>    Device managing a driver? That's interesting. :-)
>>
>> Well it is the OTG controller instance really.
>> How else do you want me to write it?
> 
>   Just HC again? Or maybe HCI (HC interface)?

In my entire series HCD has always meant Host Controller Device.
I think I'll leave it the way it is.

cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 00/14] USB OTG/dual-role framework
  2016-06-09  5:27 ` [PATCH v9 00/14] USB OTG/dual-role framework Peter Chen
@ 2016-06-09  7:30   ` Roger Quadros
  2016-06-09 10:13     ` Yoshihiro Shimoda
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:30 UTC (permalink / raw)
  To: Peter Chen, Peter Chen, yoshihiro.shimoda.uh
  Cc: balbi, tony, Greg Kroah-Hartman, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko, robh,
	nsekhar, b-liu, linux-usb, linux-omap, lkml, devicetree

Peter & Yoshihiro,

On 09/06/16 08:27, Peter Chen wrote:
> On Wed, Jun 8, 2016 at 5:03 PM, Roger Quadros <rogerq@ti.com> wrote:
>> Hi,
>>
>> This series centralizes OTG/Dual-role functionality in the kernel.
>> As of now I've got Dual-role functionality working pretty reliably on
>> dra7-evm and am437x-gp-evm.
>>
>> DWC3 controller and TI platform related patches will be sent separately.
>>
>> Series is based on v4.7-rc1.
>>
> 
> Roger, I will wait your dwc3 and TI patch set since one framework needs
> one user at least, thanks.

Sure I will post the dwc3 patch.

Yoshihiro,

could you please post the platform side patches for your platform
that enables dual-role using this framework? Thanks.

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-08 12:10       ` Sergei Shtylyov
@ 2016-06-09  7:31         ` Roger Quadros
  2016-06-09 10:16           ` Sergei Shtylyov
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:31 UTC (permalink / raw)
  To: Sergei Shtylyov, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 08/06/16 15:10, Sergei Shtylyov wrote:
> On 6/8/2016 3:04 PM, Roger Quadros wrote:
> 
>>>> The OTG core will use struct otg_hcd_ops to interface
>>>> with the HCD controller.
>>>
>>>    Host controller driver (HCD) controller? Maybe just HC? :-)
>>
>> OK.
> 
>    OTOH, my googling has shown that HCD may stand for both HC driver and HC device... The host controller device sounds a bit tautological however...

Yeah I always meant it to be Host Controller Device :).

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v10 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-08  9:03 ` [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
  2016-06-08 11:39   ` Sergei Shtylyov
@ 2016-06-09  7:51   ` Roger Quadros
  1 sibling, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:51 UTC (permalink / raw)
  To: peter.chen, sergei.shtylyov
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree, rogerq

The OTG core will use struct otg_hcd_ops to interface
with the HCD (Host Controller Device).

The main purpose of this interface is to avoid directly
calling HCD APIs from the OTG core as they
wouldn't be defined in the built-in symbol table if
CONFIG_USB is m.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
v10:
- clarify HCD abbreviation in commit message.
- Fix comment
	- remove unnecessary "of" in comment
	- use URB instead of urb.

 include/linux/usb/hcd.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 66fc137..7729c1f 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -400,6 +400,30 @@ struct hc_driver {
 
 };
 
+/**
+ * struct otg_hcd_ops - Interface between OTG core and HCD
+ *
+ * Provided by the HCD core to allow the OTG core to interface with the HCD
+ *
+ * @add: function to add the HCD
+ * @remove: function to remove the HCD
+ * @usb_bus_start_enum: function to immediately start bus enumeration
+ * @usb_control_msg: function to build and send a control URB
+ * @usb_hub_find_child: function to get pointer to the child device
+ */
+struct otg_hcd_ops {
+	int (*add)(struct usb_hcd *hcd,
+		   unsigned int irqnum, unsigned long irqflags);
+	void (*remove)(struct usb_hcd *hcd);
+	int (*usb_bus_start_enum)(struct usb_bus *bus, unsigned int port_num);
+	int (*usb_control_msg)(struct usb_device *dev, unsigned int pipe,
+			       __u8 request, __u8 requesttype, __u16 value,
+			       __u16 index, void *data, __u16 size,
+			       int timeout);
+	struct usb_device * (*usb_hub_find_child)(struct usb_device *hdev,
+						  int port1);
+};
+
 static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
 {
 	return hcd->driver->flags & HCD_BH;
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v10 08/14] usb: otg: add OTG/dual-role core
  2016-06-08  9:03 ` [PATCH v9 08/14] usb: otg: add OTG/dual-role core Roger Quadros
  2016-06-08  9:53   ` Peter Chen
@ 2016-06-09  7:53   ` Roger Quadros
  2016-06-09 12:34     ` Sergei Shtylyov
  1 sibling, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:53 UTC (permalink / raw)
  To: peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, rogerq

It provides APIs for the following tasks

- Registering an OTG/dual-role capable controller
- Registering Host and Gadget controllers to OTG core
- Providing inputs to and kicking the OTG state machine

Provide a dual-role device (DRD) state machine.
DRD mode is a reduced functionality OTG mode. In this mode
we don't support SRP, HNP and dynamic role-swap.

In DRD operation, the controller mode (Host or Peripheral)
is decided based on the ID pin status. Once a cable plug (Type-A
or Type-B) is attached the controller selects the state
and doesn't change till the cable in unplugged and a different
cable type is inserted.

As we don't need most of the complex OTG states and OTG timers
we implement a lean DRD state machine in usb-otg.c.
The DRD state machine is only interested in 2 hardware inputs
'id' and 'b_sess_vld'.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
v10:
- added missing mutex_unlock in in failure path in usb_otg_unregister()
- removed unnecessary hrtimer.h and ktime.h in linux/usb/otg.h

 drivers/usb/Kconfig          |  18 +
 drivers/usb/Makefile         |   1 +
 drivers/usb/common/Makefile  |   6 +-
 drivers/usb/common/usb-otg.c | 833 +++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/core/Kconfig     |  14 -
 drivers/usb/gadget/Kconfig   |   1 +
 include/linux/usb/gadget.h   |   2 +
 include/linux/usb/hcd.h      |   1 +
 include/linux/usb/otg-fsm.h  |   7 +
 include/linux/usb/otg.h      | 181 +++++++++-
 10 files changed, 1034 insertions(+), 30 deletions(-)
 create mode 100644 drivers/usb/common/usb-otg.c

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 8689dcb..ed596ec 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -32,6 +32,23 @@ if USB_SUPPORT
 config USB_COMMON
 	tristate
 
+config USB_OTG_CORE
+	tristate
+
+config USB_OTG
+	bool "OTG/Dual-role support"
+	depends on PM && USB && USB_GADGET
+	default n
+	---help---
+	  The most notable feature of USB OTG is support for a
+	  "Dual-Role" device, which can act as either a device
+	  or a host. The initial role is decided by the type of
+	  plug inserted and can be changed later when two dual
+	  role devices talk to each other.
+
+	  Select this only if your board has Mini-AB/Micro-AB
+	  connector.
+
 config USB_ARCH_HAS_HCD
 	def_bool y
 
@@ -40,6 +57,7 @@ config USB
 	tristate "Support for Host-side USB"
 	depends on USB_ARCH_HAS_HCD
 	select USB_COMMON
+	select USB_OTG_CORE
 	select NLS  # for UTF-8 strings
 	---help---
 	  Universal Serial Bus (USB) is a specification for a serial bus
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index dca7856..03f7204 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -59,5 +59,6 @@ obj-$(CONFIG_USB_RENESAS_USBHS)	+= renesas_usbhs/
 obj-$(CONFIG_USB_GADGET)	+= gadget/
 
 obj-$(CONFIG_USB_COMMON)	+= common/
+obj-$(CONFIG_USB_OTG_CORE)	+= common/
 
 obj-$(CONFIG_USBIP_CORE)	+= usbip/
diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
index f8f2c88..5122b3f 100644
--- a/drivers/usb/common/Makefile
+++ b/drivers/usb/common/Makefile
@@ -7,5 +7,7 @@ usb-common-y			  += common.o
 usb-common-$(CONFIG_USB_LED_TRIG) += led.o
 
 obj-$(CONFIG_USB_ULPI_BUS)	+= ulpi.o
-usbotg-y		:= usb-otg-fsm.o
-obj-$(CONFIG_USB_OTG)	+= usbotg.o
+ifeq ($(CONFIG_USB_OTG),y)
+usbotg-y		:= usb-otg.o usb-otg-fsm.o
+obj-$(CONFIG_USB_OTG_CORE)	+= usbotg.o
+endif
diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
new file mode 100644
index 0000000..baebe5c
--- /dev/null
+++ b/drivers/usb/common/usb-otg.c
@@ -0,0 +1,833 @@
+/**
+ * drivers/usb/common/usb-otg.c - USB OTG core
+ *
+ * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Roger Quadros <rogerq@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/gadget.h>
+#include <linux/workqueue.h>
+
+/* OTG device list */
+LIST_HEAD(otg_list);
+static DEFINE_MUTEX(otg_list_mutex);
+
+static int usb_otg_hcd_is_primary_hcd(struct usb_hcd *hcd)
+{
+	if (!hcd->primary_hcd)
+		return 1;
+	return hcd == hcd->primary_hcd;
+}
+
+/**
+ * Check if the OTG device is in our OTG list and return
+ * usb_otg data, else NULL.
+ *
+ * otg_list_mutex must be held.
+ */
+static struct usb_otg *usb_otg_get_data(struct device *otg_dev)
+{
+	struct usb_otg *otg;
+
+	if (!otg_dev)
+		return NULL;
+
+	list_for_each_entry(otg, &otg_list, list) {
+		if (otg->dev == otg_dev)
+			return otg;
+	}
+
+	return NULL;
+}
+
+/**
+ * usb_otg_start_host - start/stop the host controller
+ * @otg:	usb_otg instance
+ * @on:		true to start, false to stop
+ *
+ * Start/stop the USB host controller. This function is meant
+ * for use by the OTG controller driver.
+ */
+int usb_otg_start_host(struct usb_otg *otg, int on)
+{
+	struct otg_hcd_ops *hcd_ops = otg->hcd_ops;
+
+	dev_dbg(otg->dev, "otg: %s %d\n", __func__, on);
+	if (!otg->host) {
+		WARN_ONCE(1, "otg: fsm running without host\n");
+		return 0;
+	}
+
+	if (on) {
+		if (otg->flags & OTG_FLAG_HOST_RUNNING)
+			return 0;
+
+		otg->flags |= OTG_FLAG_HOST_RUNNING;
+
+		/* start host */
+		hcd_ops->add(otg->primary_hcd.hcd, otg->primary_hcd.irqnum,
+			     otg->primary_hcd.irqflags);
+		if (otg->shared_hcd.hcd) {
+			hcd_ops->add(otg->shared_hcd.hcd,
+				     otg->shared_hcd.irqnum,
+				     otg->shared_hcd.irqflags);
+		}
+	} else {
+		if (!(otg->flags & OTG_FLAG_HOST_RUNNING))
+			return 0;
+
+		otg->flags &= ~OTG_FLAG_HOST_RUNNING;
+
+		/* stop host */
+		if (otg->shared_hcd.hcd)
+			hcd_ops->remove(otg->shared_hcd.hcd);
+
+		hcd_ops->remove(otg->primary_hcd.hcd);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_start_host);
+
+/**
+ * usb_otg_start_gadget - start/stop the gadget controller
+ * @otg:	usb_otg instance
+ * @on:		true to start, false to stop
+ *
+ * Start/stop the USB gadget controller. This function is meant
+ * for use by the OTG controller driver.
+ */
+int usb_otg_start_gadget(struct usb_otg *otg, int on)
+{
+	struct usb_gadget *gadget = otg->gadget;
+
+	dev_dbg(otg->dev, "otg: %s %d\n", __func__, on);
+	if (!gadget) {
+		WARN_ONCE(1, "otg: fsm running without gadget\n");
+		return 0;
+	}
+
+	if (on) {
+		if (otg->flags & OTG_FLAG_GADGET_RUNNING)
+			return 0;
+
+		otg->flags |= OTG_FLAG_GADGET_RUNNING;
+		otg->gadget_ops->start(otg->gadget);
+	} else {
+		if (!(otg->flags & OTG_FLAG_GADGET_RUNNING))
+			return 0;
+
+		otg->flags &= ~OTG_FLAG_GADGET_RUNNING;
+		otg->gadget_ops->stop(otg->gadget);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_start_gadget);
+
+/**
+ * Change USB protocol when there is a protocol change.
+ * fsm->lock must be held.
+ */
+static int drd_set_protocol(struct otg_fsm *fsm, int protocol)
+{
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
+	int ret = 0;
+
+	if (fsm->protocol != protocol) {
+		dev_dbg(otg->dev, "otg: changing role fsm->protocol= %d; new protocol= %d\n",
+			fsm->protocol, protocol);
+		/* stop old protocol */
+		if (fsm->protocol == PROTO_HOST) {
+			ret = otg_start_host(otg, 0);
+		} else if (fsm->protocol == PROTO_GADGET) {
+			otg->gadget_ops->connect_control(otg->gadget, false);
+			ret = otg_start_gadget(otg, 0);
+		}
+
+		if (ret)
+			return ret;
+
+		/* start new protocol */
+		if (protocol == PROTO_HOST) {
+			ret = otg_start_host(otg, 1);
+		} else if (protocol == PROTO_GADGET) {
+			ret = otg_start_gadget(otg, 1);
+			otg->gadget_ops->connect_control(otg->gadget, true);
+		}
+
+		if (ret)
+			return ret;
+
+		fsm->protocol = protocol;
+		return 0;
+	}
+
+	return 0;
+}
+
+/**
+ * Called when entering a DRD state.
+ * fsm->lock must be held.
+ */
+static void drd_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
+{
+	struct usb_otg *otg = container_of(fsm, struct usb_otg, fsm);
+
+	if (otg->state == new_state)
+		return;
+
+	fsm->state_changed = 1;
+	dev_dbg(otg->dev, "otg: set state: %s\n",
+		usb_otg_state_string(new_state));
+	switch (new_state) {
+	case OTG_STATE_B_IDLE:
+		drd_set_protocol(fsm, PROTO_UNDEF);
+		otg_drv_vbus(otg, 0);
+		break;
+	case OTG_STATE_B_PERIPHERAL:
+		drd_set_protocol(fsm, PROTO_GADGET);
+		otg_drv_vbus(otg, 0);
+		break;
+	case OTG_STATE_A_HOST:
+		drd_set_protocol(fsm, PROTO_HOST);
+		otg_drv_vbus(otg, 1);
+		break;
+	default:
+		dev_warn(otg->dev, "%s: otg: invalid state: %s\n",
+			 __func__, usb_otg_state_string(new_state));
+		break;
+	}
+
+	otg->state = new_state;
+}
+
+/**
+ * DRD state change judgement
+ *
+ * For DRD we're only interested in some of the OTG states
+ * i.e. OTG_STATE_B_IDLE: both peripheral and host are stopped
+ *	OTG_STATE_B_PERIPHERAL: peripheral active
+ *	OTG_STATE_A_HOST: host active
+ * we're only interested in the following inputs
+ *	fsm->id, fsm->b_sess_vld
+ */
+int drd_statemachine(struct usb_otg *otg)
+{
+	struct otg_fsm *fsm = &otg->fsm;
+	enum usb_otg_state state;
+	int ret;
+
+	mutex_lock(&fsm->lock);
+
+	fsm->state_changed = 0;
+	state = otg->state;
+
+	switch (state) {
+	case OTG_STATE_UNDEFINED:
+		if (!fsm->id)
+			drd_set_state(fsm, OTG_STATE_A_HOST);
+		else if (fsm->id && fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
+		else
+			drd_set_state(fsm, OTG_STATE_B_IDLE);
+		break;
+	case OTG_STATE_B_IDLE:
+		if (!fsm->id)
+			drd_set_state(fsm, OTG_STATE_A_HOST);
+		else if (fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
+		break;
+	case OTG_STATE_B_PERIPHERAL:
+		if (!fsm->id)
+			drd_set_state(fsm, OTG_STATE_A_HOST);
+		else if (!fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_IDLE);
+		break;
+	case OTG_STATE_A_HOST:
+		if (fsm->id && fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_PERIPHERAL);
+		else if (fsm->id && !fsm->b_sess_vld)
+			drd_set_state(fsm, OTG_STATE_B_IDLE);
+		break;
+
+	default:
+		dev_err(otg->dev, "%s: otg: invalid usb-drd state: %s\n",
+			__func__, usb_otg_state_string(state));
+		break;
+	}
+
+	ret = fsm->state_changed;
+	mutex_unlock(&fsm->lock);
+	dev_dbg(otg->dev, "otg: quit statemachine, changed %d\n",
+		fsm->state_changed);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(drd_statemachine);
+
+/**
+ * Dual-role device (DRD) work function
+ */
+static void usb_drd_work(struct work_struct *work)
+{
+	struct usb_otg *otg = container_of(work, struct usb_otg, work);
+
+	pm_runtime_get_sync(otg->dev);
+	while (drd_statemachine(otg))
+	;
+	pm_runtime_put_sync(otg->dev);
+}
+
+/**
+ * usb_otg_register() - Register the OTG/dual-role device to OTG core
+ * @dev: OTG/dual-role controller device.
+ * @config: OTG configuration.
+ *
+ * Registers the OTG/dual-role controller device with the USB OTG core.
+ *
+ * Return: struct usb_otg * if success, ERR_PTR() if error.
+ */
+struct usb_otg *usb_otg_register(struct device *dev,
+				 struct usb_otg_config *config)
+{
+	struct usb_otg *otg;
+	int ret = 0;
+
+	if (!dev || !config || !config->fsm_ops)
+		return ERR_PTR(-EINVAL);
+
+	/* already in list? */
+	mutex_lock(&otg_list_mutex);
+	if (usb_otg_get_data(dev)) {
+		dev_err(dev, "otg: %s: device already in otg list\n",
+			__func__);
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	/* allocate and add to list */
+	otg = kzalloc(sizeof(*otg), GFP_KERNEL);
+	if (!otg) {
+		ret = -ENOMEM;
+		goto unlock;
+	}
+
+	otg->dev = dev;
+	/* otg->caps is controller caps + DT overrides */
+	otg->caps = *config->otg_caps;
+	ret = of_usb_update_otg_caps(dev->of_node, &otg->caps);
+	if (ret)
+		goto err_wq;
+
+	if ((otg->caps.hnp_support || otg->caps.srp_support ||
+	     otg->caps.adp_support) && !config->otg_work) {
+		dev_err(dev,
+			"otg: otg_work must be provided for OTG support\n");
+		ret = -EINVAL;
+		goto err_wq;
+	}
+
+	if (config->otg_work)	/* custom otg_work ? */
+		INIT_WORK(&otg->work, config->otg_work);
+	else
+		INIT_WORK(&otg->work, usb_drd_work);
+
+	otg->wq = create_freezable_workqueue("usb_otg");
+	if (!otg->wq) {
+		dev_err(dev, "otg: %s: can't create workqueue\n",
+			__func__);
+		ret = -ENOMEM;
+		goto err_wq;
+	}
+
+	/* set otg ops */
+	otg->fsm.ops = config->fsm_ops;
+
+	mutex_init(&otg->fsm.lock);
+
+	list_add_tail(&otg->list, &otg_list);
+	mutex_unlock(&otg_list_mutex);
+
+	return otg;
+
+err_wq:
+	kfree(otg);
+unlock:
+	mutex_unlock(&otg_list_mutex);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(usb_otg_register);
+
+/**
+ * usb_otg_unregister() - Unregister the OTG/dual-role device from USB OTG core
+ * @dev: OTG controller device.
+ *
+ * Unregisters the OTG/dual-role controller device from USB OTG core.
+ * Prevents unregistering till both the associated Host and Gadget controllers
+ * have unregistered from the OTG core.
+ *
+ * Return: 0 on success, error value otherwise.
+ */
+int usb_otg_unregister(struct device *dev)
+{
+	struct usb_otg *otg;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(dev);
+	if (!otg) {
+		dev_err(dev, "otg: %s: device not in otg list\n",
+			__func__);
+		mutex_unlock(&otg_list_mutex);
+		return -EINVAL;
+	}
+
+	/* prevent unregister till both host & gadget have unregistered */
+	if (otg->host || otg->gadget) {
+		dev_err(dev, "otg: %s: host/gadget still registered\n",
+			__func__);
+		mutex_unlock(&otg_list_mutex);
+		return -EBUSY;
+	}
+
+	/* OTG FSM is halted when host/gadget unregistered */
+	destroy_workqueue(otg->wq);
+
+	/* remove from otg list */
+	list_del(&otg->list);
+	kfree(otg);
+	mutex_unlock(&otg_list_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_unregister);
+
+/**
+ * start/kick the OTG FSM if we can
+ * fsm->lock must be held
+ */
+static void usb_otg_start_fsm(struct usb_otg *otg)
+{
+	struct otg_fsm *fsm = &otg->fsm;
+
+	if (fsm->running)
+		goto kick_fsm;
+
+	if (!otg->host) {
+		dev_info(otg->dev, "otg: can't start till host registers\n");
+		return;
+	}
+
+	if (!otg->gadget) {
+		dev_info(otg->dev,
+			 "otg: can't start till gadget UDC registers\n");
+		return;
+	}
+
+	if (!otg->gadget_ready) {
+		dev_info(otg->dev,
+			 "otg: can't start till gadget function registers\n");
+		return;
+	}
+
+	fsm->running = true;
+kick_fsm:
+	queue_work(otg->wq, &otg->work);
+}
+
+/**
+ * stop the OTG FSM. Stops Host & Gadget controllers as well.
+ * fsm->lock must be held
+ */
+static void usb_otg_stop_fsm(struct usb_otg *otg)
+{
+	struct otg_fsm *fsm = &otg->fsm;
+
+	if (!fsm->running)
+		return;
+
+	/* no more new events queued */
+	fsm->running = false;
+
+	flush_workqueue(otg->wq);
+	otg->state = OTG_STATE_UNDEFINED;
+
+	/* stop host/gadget immediately */
+	if (fsm->protocol == PROTO_HOST) {
+		otg_start_host(otg, 0);
+	} else if (fsm->protocol == PROTO_GADGET) {
+		otg->gadget_ops->connect_control(otg->gadget, false);
+		otg_start_gadget(otg, 0);
+	}
+	fsm->protocol = PROTO_UNDEF;
+}
+
+/**
+ * usb_otg_sync_inputs - Sync OTG inputs with the OTG state machine
+ * @fsm:	OTG FSM instance
+ *
+ * Used by the OTG driver to update the inputs to the OTG
+ * state machine.
+ *
+ * Can be called in IRQ context.
+ */
+void usb_otg_sync_inputs(struct usb_otg *otg)
+{
+	/* Don't kick FSM till it has started */
+	if (!otg->fsm.running)
+		return;
+
+	/* Kick FSM */
+	queue_work(otg->wq, &otg->work);
+}
+EXPORT_SYMBOL_GPL(usb_otg_sync_inputs);
+
+/**
+ * usb_otg_kick_fsm - Kick the OTG state machine
+ * @otg_dev:	OTG controller device
+ *
+ * Used by USB host/device stack to sync OTG related
+ * events to the OTG state machine.
+ * e.g. change in host_bus->b_hnp_enable, gadget->b_hnp_enable
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_kick_fsm(struct device *otg_dev)
+{
+	struct usb_otg *otg;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_dbg(otg_dev, "otg: %s: invalid otg device\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	usb_otg_sync_inputs(otg);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_kick_fsm);
+
+/**
+ * usb_otg_register_hcd - Register the host controller to OTG core
+ * @hcd:	host controller device
+ * @irqnum:	interrupt number
+ * @irqflags:	interrupt flags
+ * @ops:	HCD ops to interface with the HCD
+ *
+ * This is used by the USB Host stack to register the host controller
+ * to the OTG core. Host controller must not be started by the
+ * caller as it is left upto the OTG state machine to do so.
+ * hcd->otg_dev must contain the related otg controller device.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
+			 unsigned long irqflags, struct otg_hcd_ops *ops)
+{
+	struct usb_otg *otg;
+	struct device *hcd_dev = hcd->self.controller;
+	struct device *otg_dev = hcd->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;
+
+	/* we're otg but otg controller might not yet be registered */
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_dbg(hcd_dev,
+			"otg: controller not yet registered. deferring.\n");
+		return -EPROBE_DEFER;
+	}
+
+	/* HCD will be started by OTG fsm when needed */
+	mutex_lock(&otg->fsm.lock);
+	if (otg->primary_hcd.hcd) {
+		/* probably a shared HCD ? */
+		if (usb_otg_hcd_is_primary_hcd(hcd)) {
+			dev_err(otg_dev, "otg: primary host already registered\n");
+			goto err;
+		}
+
+		if (hcd->shared_hcd == otg->primary_hcd.hcd) {
+			if (otg->shared_hcd.hcd) {
+				dev_err(otg_dev, "otg: shared host already registered\n");
+				goto err;
+			}
+
+			otg->shared_hcd.hcd = hcd;
+			otg->shared_hcd.irqnum = irqnum;
+			otg->shared_hcd.irqflags = irqflags;
+			otg->shared_hcd.ops = ops;
+			dev_info(otg_dev, "otg: shared host %s registered\n",
+				 dev_name(hcd->self.controller));
+		} else {
+			dev_err(otg_dev, "otg: invalid shared host %s\n",
+				dev_name(hcd->self.controller));
+			goto err;
+		}
+	} else {
+		if (!usb_otg_hcd_is_primary_hcd(hcd)) {
+			dev_err(otg_dev, "otg: primary host must be registered first\n");
+			goto err;
+		}
+
+		otg->primary_hcd.hcd = hcd;
+		otg->primary_hcd.irqnum = irqnum;
+		otg->primary_hcd.irqflags = irqflags;
+		otg->primary_hcd.ops = ops;
+		otg->hcd_ops = ops;
+		dev_info(otg_dev, "otg: primary host %s registered\n",
+			 dev_name(hcd->self.controller));
+	}
+
+	/*
+	 * we're ready only if we have shared HCD
+	 * or we don't need shared HCD.
+	 */
+	if (otg->shared_hcd.hcd || !otg->primary_hcd.hcd->shared_hcd) {
+		otg->host = hcd_to_bus(hcd);
+		/* FIXME: set bus->otg_port if this is true OTG port with HNP */
+
+		/* start FSM */
+		usb_otg_start_fsm(otg);
+	} else {
+		dev_dbg(otg_dev, "otg: can't start till shared host registers\n");
+	}
+
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+
+err:
+	mutex_unlock(&otg->fsm.lock);
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(usb_otg_register_hcd);
+
+/**
+ * usb_otg_unregister_hcd - Unregister the host controller from OTG core
+ * @hcd:	host controller device
+ *
+ * This is used by the USB Host stack to unregister the host controller
+ * from the OTG core. Ensures that host controller is not running
+ * on successful return.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_unregister_hcd(struct usb_hcd *hcd)
+{
+	struct usb_otg *otg;
+	struct device *hcd_dev = hcd_to_bus(hcd)->controller;
+	struct device *otg_dev = hcd->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;	/* we're definitely not OTG */
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_err(hcd_dev, "otg: host %s wasn't registered with otg\n",
+			dev_name(hcd_dev));
+		return -EINVAL;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (hcd == otg->primary_hcd.hcd) {
+		otg->primary_hcd.hcd = NULL;
+		dev_info(otg_dev, "otg: primary host %s unregistered\n",
+			 dev_name(hcd_dev));
+	} else if (hcd == otg->shared_hcd.hcd) {
+		otg->shared_hcd.hcd = NULL;
+		dev_info(otg_dev, "otg: shared host %s unregistered\n",
+			 dev_name(hcd_dev));
+	} else {
+		mutex_unlock(&otg->fsm.lock);
+		dev_err(otg_dev, "otg: host %s wasn't registered with otg\n",
+			dev_name(hcd_dev));
+		return -EINVAL;
+	}
+
+	/* stop FSM & Host */
+	usb_otg_stop_fsm(otg);
+	otg->host = NULL;
+
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_unregister_hcd);
+
+/**
+ * usb_otg_register_gadget - Register the gadget controller to OTG core
+ * @gadget:	gadget controller
+ *
+ * This is used by the USB gadget stack to register the gadget controller
+ * to the OTG core. Gadget controller must not be started by the
+ * caller as it is left upto the OTG state machine to do so.
+ *
+ * Gadget core must call this only when all resources required for
+ * gadget controller to run are available.
+ * i.e. gadget function driver is available.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_register_gadget(struct usb_gadget *gadget,
+			    struct otg_gadget_ops *ops)
+{
+	struct usb_otg *otg;
+	struct device *gadget_dev = &gadget->dev;
+	struct device *otg_dev = gadget->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;	/* we're definitely not OTG */
+
+	/* we're otg but otg controller might not yet be registered */
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_dbg(gadget_dev,
+			"otg: controller not yet registered, deferring.\n");
+		return -EPROBE_DEFER;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (otg->gadget) {
+		dev_err(otg_dev, "otg: gadget already registered with otg\n");
+		mutex_unlock(&otg->fsm.lock);
+		return -EINVAL;
+	}
+
+	otg->gadget = gadget;
+	otg->gadget_ops = ops;
+	dev_info(otg_dev, "otg: gadget %s registered\n",
+		 dev_name(&gadget->dev));
+
+	/* FSM will be started in usb_otg_gadget_ready() */
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_register_gadget);
+
+/**
+ * usb_otg_unregister_gadget - Unregister the gadget controller from OTG core
+ * @gadget:	gadget controller
+ *
+ * This is used by the USB gadget stack to unregister the gadget controller
+ * from the OTG core. Ensures that gadget controller is halted
+ * on successful return.
+ *
+ * Returns: 0 on success, error value otherwise.
+ */
+int usb_otg_unregister_gadget(struct usb_gadget *gadget)
+{
+	struct usb_otg *otg;
+	struct device *gadget_dev = &gadget->dev;
+	struct device *otg_dev = gadget->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_err(gadget_dev,
+			"otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (otg->gadget != gadget) {
+		mutex_unlock(&otg->fsm.lock);
+		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	/* FSM must be stopped in usb_otg_gadget_ready() */
+	if (otg->gadget_ready) {
+		dev_err(otg_dev,
+			"otg: gadget %s unregistered before being unready, forcing stop\n",
+			dev_name(&gadget->dev));
+		usb_otg_stop_fsm(otg);
+	}
+
+	otg->gadget = NULL;
+	mutex_unlock(&otg->fsm.lock);
+
+	dev_info(otg_dev, "otg: gadget %s unregistered\n",
+		 dev_name(&gadget->dev));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_unregister_gadget);
+
+int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
+{
+	struct usb_otg *otg;
+	struct device *gadget_dev = &gadget->dev;
+	struct device *otg_dev = gadget->otg_dev;
+
+	if (!otg_dev)
+		return -EINVAL;
+
+	mutex_lock(&otg_list_mutex);
+	otg = usb_otg_get_data(otg_dev);
+	mutex_unlock(&otg_list_mutex);
+	if (!otg) {
+		dev_err(gadget_dev,
+			"otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	mutex_lock(&otg->fsm.lock);
+	if (otg->gadget != gadget) {
+		mutex_unlock(&otg->fsm.lock);
+		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
+			dev_name(&gadget->dev));
+		return -EINVAL;
+	}
+
+	/* Start/stop FSM & gadget */
+	otg->gadget_ready = ready;
+	if (ready)
+		usb_otg_start_fsm(otg);
+	else
+		usb_otg_stop_fsm(otg);
+
+	dev_dbg(otg_dev, "otg: gadget %s %sready\n", dev_name(&gadget->dev),
+		ready ? "" : "not ");
+
+	mutex_unlock(&otg->fsm.lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_gadget_ready);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index ae228d0..37f8c54 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -41,20 +41,6 @@ config USB_DYNAMIC_MINORS
 
 	  If you are unsure about this, say N here.
 
-config USB_OTG
-	bool "OTG support"
-	depends on PM
-	default n
-	help
-	  The most notable feature of USB OTG is support for a
-	  "Dual-Role" device, which can act as either a device
-	  or a host. The initial role is decided by the type of
-	  plug inserted and can be changed later when two dual
-	  role devices talk to each other.
-
-	  Select this only if your board has Mini-AB/Micro-AB
-	  connector.
-
 config USB_OTG_WHITELIST
 	bool "Rely on OTG and EH Targeted Peripherals List"
 	depends on USB
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 2057add..9d55384 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -16,6 +16,7 @@
 menuconfig USB_GADGET
 	tristate "USB Gadget Support"
 	select USB_COMMON
+	select USB_OTG_CORE
 	select NLS
 	help
 	   USB is a master/slave protocol, organized with one master
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 51e3bde..1237f66 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -583,6 +583,7 @@ struct usb_gadget_ops {
  * @out_epnum: last used out ep number
  * @in_epnum: last used in ep number
  * @otg_caps: OTG capabilities of this gadget.
+ * @otg_dev: OTG controller device, if needs to be used with OTG core.
  * @sg_supported: true if we can handle scatter-gather
  * @is_otg: True if the USB device port uses a Mini-AB jack, so that the
  *	gadget driver must provide a USB OTG descriptor.
@@ -639,6 +640,7 @@ struct usb_gadget {
 	unsigned			out_epnum;
 	unsigned			in_epnum;
 	struct usb_otg_caps		*otg_caps;
+	struct device			*otg_dev;
 
 	unsigned			sg_supported:1;
 	unsigned			is_otg:1;
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 7729c1f..36bd54f 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -185,6 +185,7 @@ struct usb_hcd {
 	struct mutex		*bandwidth_mutex;
 	struct usb_hcd		*shared_hcd;
 	struct usb_hcd		*primary_hcd;
+	struct device		*otg_dev;	/* OTG controller device */
 
 
 #define HCD_BUFFER_POOLS	4
diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
index 26e6531..943714a 100644
--- a/include/linux/usb/otg-fsm.h
+++ b/include/linux/usb/otg-fsm.h
@@ -60,6 +60,11 @@ enum otg_fsm_timer {
 /**
  * struct otg_fsm - OTG state machine according to the OTG spec
  *
+ * DRD mode hardware Inputs
+ *
+ * @id:		TRUE for B-device, FALSE for A-device.
+ * @b_sess_vld:	VBUS voltage in regulation.
+ *
  * OTG hardware Inputs
  *
  *	Common inputs for A and B device
@@ -132,6 +137,7 @@ enum otg_fsm_timer {
  * a_clr_err:	Asserted (by application ?) to clear a_vbus_err due to an
  *		overcurrent condition and causes the A-device to transition
  *		to a_wait_vfall
+ * running:	state machine running/stopped indicator
  */
 struct otg_fsm {
 	/* Input */
@@ -187,6 +193,7 @@ struct otg_fsm {
 	int b_ase0_brst_tmout;
 	int a_bidl_adis_tmout;
 
+	bool running;
 	struct otg_fsm_ops *ops;
 
 	/* Current usb protocol used: 0:undefine; 1:host; 2:client */
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 85b8fb5..5d4850a 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -10,10 +10,68 @@
 #define __LINUX_USB_OTG_H
 
 #include <linux/phy/phy.h>
-#include <linux/usb/phy.h>
-#include <linux/usb/otg-fsm.h>
+#include <linux/device.h>
+#include <linux/usb.h>
 #include <linux/usb/hcd.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg-fsm.h>
+#include <linux/usb/phy.h>
+
+/**
+ * struct otg_hcd - host controller state and interface
+ *
+ * @hcd: host controller
+ * @irqnum: irq number
+ * @irqflags: irq flags
+ * @ops: otg to host controller interface
+ * @ops: otg to host controller interface
+ * @otg_dev: otg controller device
+ */
+struct otg_hcd {
+	struct usb_hcd *hcd;
+	unsigned int irqnum;
+	unsigned long irqflags;
+	struct otg_hcd_ops *ops;
+	struct device *otg_dev;
+};
+
+/**
+ * struct usb_otg_caps - describes the otg capabilities of the device
+ * @otg_rev: The OTG revision number the device is compliant with, it's
+ *		in binary-coded decimal (i.e. 2.0 is 0200H).
+ * @hnp_support: Indicates if the device supports HNP.
+ * @srp_support: Indicates if the device supports SRP.
+ * @adp_support: Indicates if the device supports ADP.
+ */
+struct usb_otg_caps {
+	u16 otg_rev;
+	bool hnp_support;
+	bool srp_support;
+	bool adp_support;
+};
 
+/**
+ * struct usb_otg - usb otg controller state
+ *
+ * @default_a: Indicates we are an A device. i.e. Host.
+ * @phy: USB phy interface
+ * @usb_phy: old usb_phy interface
+ * @host: host controller bus
+ * @gadget: gadget device
+ * @state: current otg state
+ * @dev: otg controller device
+ * @caps: otg capabilities revision, hnp, srp, etc
+ * @fsm: otg finite state machine
+ * @hcd_ops: host controller interface
+ * ------- internal use only -------
+ * @primary_hcd: primary host state and interface
+ * @shared_hcd: shared host state and interface
+ * @gadget_ops: gadget controller interface
+ * @list: list of otg controllers
+ * @work: otg state machine work
+ * @wq: otg state machine work queue
+ * @flags: to track if host/gadget is running
+ */
 struct usb_otg {
 	u8			default_a;
 
@@ -24,9 +82,25 @@ struct usb_otg {
 	struct usb_gadget	*gadget;
 
 	enum usb_otg_state	state;
+	struct device *dev;
+	struct usb_otg_caps	caps;
 	struct otg_fsm fsm;
 	struct otg_hcd_ops	*hcd_ops;
 
+	/* internal use only */
+	struct otg_hcd primary_hcd;
+	struct otg_hcd shared_hcd;
+	struct otg_gadget_ops *gadget_ops;
+	bool gadget_ready;
+	struct list_head list;
+	struct work_struct work;
+	struct workqueue_struct *wq;
+	u32 flags;
+#define OTG_FLAG_GADGET_RUNNING (1 << 0)
+#define OTG_FLAG_HOST_RUNNING (1 << 1)
+	/* use otg->fsm.lock for serializing access */
+
+/*------------- deprecated interface -----------------------------*/
 	/* bind/unbind the host controller */
 	int	(*set_host)(struct usb_otg *otg, struct usb_bus *host);
 
@@ -42,26 +116,101 @@ struct usb_otg {
 
 	/* start or continue HNP role switch */
 	int	(*start_hnp)(struct usb_otg *otg);
-
+/*---------------------------------------------------------------*/
 };
 
 /**
- * struct usb_otg_caps - describes the otg capabilities of the device
- * @otg_rev: The OTG revision number the device is compliant with, it's
- *		in binary-coded decimal (i.e. 2.0 is 0200H).
- * @hnp_support: Indicates if the device supports HNP.
- * @srp_support: Indicates if the device supports SRP.
- * @adp_support: Indicates if the device supports ADP.
+ * struct usb_otg_config - otg controller configuration
+ * @caps: otg capabilities of the controller
+ * @ops: otg fsm operations
+ * @otg_work: optional custom otg state machine work function
  */
-struct usb_otg_caps {
-	u16 otg_rev;
-	bool hnp_support;
-	bool srp_support;
-	bool adp_support;
+struct usb_otg_config {
+	struct usb_otg_caps *otg_caps;
+	struct otg_fsm_ops *fsm_ops;
+	void (*otg_work)(struct work_struct *work);
 };
 
 extern const char *usb_otg_state_string(enum usb_otg_state state);
 
+#if IS_ENABLED(CONFIG_USB_OTG)
+struct usb_otg *usb_otg_register(struct device *dev,
+				 struct usb_otg_config *config);
+int usb_otg_unregister(struct device *dev);
+int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
+			 unsigned long irqflags, struct otg_hcd_ops *ops);
+int usb_otg_unregister_hcd(struct usb_hcd *hcd);
+int usb_otg_register_gadget(struct usb_gadget *gadget,
+			    struct otg_gadget_ops *ops);
+int usb_otg_unregister_gadget(struct usb_gadget *gadget);
+void usb_otg_sync_inputs(struct usb_otg *otg);
+int usb_otg_kick_fsm(struct device *otg_dev);
+int usb_otg_start_host(struct usb_otg *otg, int on);
+int usb_otg_start_gadget(struct usb_otg *otg, int on);
+int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready);
+
+#else /* CONFIG_USB_OTG */
+
+static inline struct usb_otg *usb_otg_register(struct device *dev,
+					       struct usb_otg_config *config)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline int usb_otg_unregister(struct device *dev)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
+				       unsigned long irqflags,
+				       struct otg_hcd_ops *ops)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_unregister_hcd(struct usb_hcd *hcd)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_register_gadget(struct usb_gadget *gadget,
+					  struct otg_gadget_ops *ops)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_unregister_gadget(struct usb_gadget *gadget)
+{
+	return -ENOTSUPP;
+}
+
+static inline void usb_otg_sync_inputs(struct usb_otg *otg)
+{
+}
+
+static inline int usb_otg_kick_fsm(struct device *otg_dev)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_start_host(struct usb_otg *otg, int on)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_start_gadget(struct usb_otg *otg, int on)
+{
+	return -ENOTSUPP;
+}
+
+static inline int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
+{
+	return -ENOTSUPP;
+}
+#endif /* CONFIG_USB_OTG */
+
+/*------------- deprecated interface -----------------------------*/
 /* Context: can sleep */
 static inline int
 otg_start_hnp(struct usb_otg *otg)
@@ -113,6 +262,8 @@ otg_start_srp(struct usb_otg *otg)
 	return -ENOTSUPP;
 }
 
+/*---------------------------------------------------------------*/
+
 /* for OTG controller drivers (and maybe other stuff) */
 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
 
@@ -237,4 +388,6 @@ static inline int otg_start_gadget(struct usb_otg *otg, int on)
 	return otg->fsm.ops->start_gadget(otg, on);
 }
 
+int drd_statemachine(struct usb_otg *otg);
+
 #endif /* __LINUX_USB_OTG_H */
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v10 11/14] usb: otg: use dev_dbg() instead of VDBG()
  2016-06-08  9:03 ` [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
  2016-06-08 15:10   ` Joe Perches
@ 2016-06-09  7:55   ` Roger Quadros
  2016-06-09 15:43     ` Joe Perches
  1 sibling, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-09  7:55 UTC (permalink / raw)
  To: peter.chen, Joe Perches
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree, rogerq

Now that we have a device reference in struct usb_otg
let's use dev_vdbg() for debug messages instead of VDBG().

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
v10:
- in the commit message say dev_vdbg() instead of dev_dbg()

 drivers/usb/common/usb-otg-fsm.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
index 482d4c9..e6e58c2 100644
--- a/drivers/usb/common/usb-otg-fsm.c
+++ b/drivers/usb/common/usb-otg-fsm.c
@@ -30,13 +30,6 @@
 #include <linux/usb/otg.h>
 #include <linux/usb/otg-fsm.h>
 
-#ifdef VERBOSE
-#define VDBG(fmt, args...) pr_debug("[%s]  " fmt, \
-				 __func__, ## args)
-#else
-#define VDBG(stuff...)	do {} while (0)
-#endif
-
 /* Change USB protocol when there is a protocol change */
 static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 {
@@ -44,8 +37,9 @@ static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
 	int ret = 0;
 
 	if (fsm->protocol != protocol) {
-		VDBG("Changing role fsm->protocol= %d; new protocol= %d\n",
-			fsm->protocol, protocol);
+		dev_vdbg(otg->dev,
+			 "Changing role fsm->protocol= %d; new protocol= %d\n",
+			 fsm->protocol, protocol);
 		/* stop old protocol */
 		if (fsm->protocol == PROTO_HOST)
 			ret = otg_start_host(otg, 0);
@@ -226,7 +220,7 @@ static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
 
 	if (otg->state == new_state)
 		return 0;
-	VDBG("Set state: %s\n", usb_otg_state_string(new_state));
+	dev_vdbg(otg->dev, "Set state: %s\n", usb_otg_state_string(new_state));
 	otg_leave_state(fsm, otg->state);
 	switch (new_state) {
 	case OTG_STATE_B_IDLE:
@@ -358,7 +352,7 @@ int otg_statemachine(struct usb_otg *otg)
 
 	switch (state) {
 	case OTG_STATE_UNDEFINED:
-		VDBG("fsm->id = %d\n", fsm->id);
+		dev_vdbg(otg->dev, "fsm->id = %d\n", fsm->id);
 		if (fsm->id)
 			otg_set_state(fsm, OTG_STATE_B_IDLE);
 		else
@@ -466,7 +460,8 @@ int otg_statemachine(struct usb_otg *otg)
 	}
 	mutex_unlock(&fsm->lock);
 
-	VDBG("quit statemachine, changed = %d\n", fsm->state_changed);
+	dev_vdbg(otg->dev, "quit statemachine, changed = %d\n",
+		 fsm->state_changed);
 	return fsm->state_changed;
 }
 EXPORT_SYMBOL_GPL(otg_statemachine);
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

* RE: [PATCH v9 00/14] USB OTG/dual-role framework
  2016-06-09  7:30   ` Roger Quadros
@ 2016-06-09 10:13     ` Yoshihiro Shimoda
  0 siblings, 0 replies; 52+ messages in thread
From: Yoshihiro Shimoda @ 2016-06-09 10:13 UTC (permalink / raw)
  To: Roger Quadros
  Cc: balbi, tony, Greg Kroah-Hartman, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko, robh,
	nsekhar, b-liu, linux-usb, linux-omap, lkml, devicetree,
	Peter Chen, Peter Chen

Hi Roger,

> From: Roger Quadros
> Sent: Thursday, June 09, 2016 4:31 PM
> 
> Peter & Yoshihiro,
> 
> On 09/06/16 08:27, Peter Chen wrote:
> > On Wed, Jun 8, 2016 at 5:03 PM, Roger Quadros <rogerq@ti.com> wrote:
> >> Hi,
> >>
> >> This series centralizes OTG/Dual-role functionality in the kernel.
> >> As of now I've got Dual-role functionality working pretty reliably on
> >> dra7-evm and am437x-gp-evm.
> >>
> >> DWC3 controller and TI platform related patches will be sent separately.
> >>
> >> Series is based on v4.7-rc1.
> >>
> >
> > Roger, I will wait your dwc3 and TI patch set since one framework needs
> > one user at least, thanks.
> 
> Sure I will post the dwc3 patch.
> 
> Yoshihiro,
> 
> could you please post the platform side patches for your platform
> that enables dual-role using this framework? Thanks.

Sure. I will do that.

Best regards,
Yoshihiro Shimoda

> --
> cheers,
> -roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-09  7:31         ` Roger Quadros
@ 2016-06-09 10:16           ` Sergei Shtylyov
  2016-06-09 14:11             ` Alan Stern
  0 siblings, 1 reply; 52+ messages in thread
From: Sergei Shtylyov @ 2016-06-09 10:16 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

Hello.

On 6/9/2016 10:31 AM, Roger Quadros wrote:

>>>>> The OTG core will use struct otg_hcd_ops to interface
>>>>> with the HCD controller.
>>>>
>>>>    Host controller driver (HCD) controller? Maybe just HC? :-)
>>>
>>> OK.
>>
>>    OTOH, my googling has shown that HCD may stand for both HC driver and HC device... The host controller device sounds a bit tautological however...
>
> Yeah I always meant it to be Host Controller Device :).

    The question here is more what was meant by the previous Linux USB 
authors. :-)

> --
> cheers,
> -roger

MBR, Sergei

^ permalink raw reply	[flat|nested] 52+ messages in thread

* RE: [PATCH v9 13/14] usb: gadget: udc: adapt to OTG core
  2016-06-08  9:03 ` [PATCH v9 13/14] usb: gadget: udc: adapt " Roger Quadros
@ 2016-06-09 10:49   ` Yoshihiro Shimoda
  2016-06-10  7:06     ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Yoshihiro Shimoda @ 2016-06-09 10:49 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, robh, nsekhar, b-liu,
	linux-usb, linux-omap, linux-kernel, devicetree

Hi Roger,

> From: Roger Quadros
> Sent: Wednesday, June 08, 2016 6:04 PM
> 
> The OTG state machine needs a mechanism to start and
> stop the gadget controller as well as connect/disconnect
> from the bus. Add usb_gadget_start(), usb_gadget_stop()
> and usb_gadget_connect_control().
> 
> Introduce usb_otg_add_gadget_udc() to allow controller drivers
> to register a gadget controller that is part of an OTG instance.
> 
> Register with OTG core when UDC is added in usb_add_gadget_udc_release()
> and unregister on usb_del_gadget_udc().
> 
> Notify the OTG core when gadget function driver is available on
> udc_bind_to_driver() and when it is removed in usb_gadget_remove_driver().
> 
> We need to unlock the usb_lock mutex before calling
> usb_otg_register_gadget() else it will cause a circular
> locking dependency.
> 
> Ignore softconnect sysfs control when we're in OTG
> mode as OTG FSM should care of gadget softconnect using
> the b_bus_req mechanism.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
>  drivers/usb/gadget/udc/udc-core.c | 202 ++++++++++++++++++++++++++++++++++++--
>  include/linux/usb/gadget.h        |   4 +
>  2 files changed, 196 insertions(+), 10 deletions(-)

I tried to apply this patch on the Felipe's usb.git / testing/next branch,
but I couldn't apply because the udc-core.c was renamed to core.c.
https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=a22b539c7082b6a3046b3a9cebb356a047a2d81d

I guess this patch needs rebase for that.

Best regards,
Yoshihiro Shimoda

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core
  2016-06-09  7:53   ` [PATCH v10 " Roger Quadros
@ 2016-06-09 12:34     ` Sergei Shtylyov
  2016-06-10  7:04       ` Roger Quadros
  2016-06-10 10:19       ` Roger Quadros
  0 siblings, 2 replies; 52+ messages in thread
From: Sergei Shtylyov @ 2016-06-09 12:34 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 6/9/2016 10:53 AM, Roger Quadros wrote:

> It provides APIs for the following tasks
>
> - Registering an OTG/dual-role capable controller
> - Registering Host and Gadget controllers to OTG core
> - Providing inputs to and kicking the OTG state machine
>
> Provide a dual-role device (DRD) state machine.
> DRD mode is a reduced functionality OTG mode. In this mode
> we don't support SRP, HNP and dynamic role-swap.
>
> In DRD operation, the controller mode (Host or Peripheral)
> is decided based on the ID pin status. Once a cable plug (Type-A
> or Type-B) is attached the controller selects the state
> and doesn't change till the cable in unplugged and a different
> cable type is inserted.
>
> As we don't need most of the complex OTG states and OTG timers
> we implement a lean DRD state machine in usb-otg.c.
> The DRD state machine is only interested in 2 hardware inputs
> 'id' and 'b_sess_vld'.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>

[...]

> diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
> new file mode 100644
> index 0000000..baebe5c
> --- /dev/null
> +++ b/drivers/usb/common/usb-otg.c
> @@ -0,0 +1,833 @@
[...]
> +/**
> + * Change USB protocol when there is a protocol change.
> + * fsm->lock must be held.
> + */

    If you're using the kernel-doc comment, please follow the rules.

> +static int drd_set_protocol(struct otg_fsm *fsm, int protocol)
[...]
> +/**
> + * Called when entering a DRD state.
> + * fsm->lock must be held.
> + */

    Same here.

> +static void drd_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
[...]
> +/**
> + * DRD state change judgement
> + *
> + * For DRD we're only interested in some of the OTG states
> + * i.e. OTG_STATE_B_IDLE: both peripheral and host are stopped
> + *	OTG_STATE_B_PERIPHERAL: peripheral active
> + *	OTG_STATE_A_HOST: host active
> + * we're only interested in the following inputs
> + *	fsm->id, fsm->b_sess_vld
> + */

    And here.

> +/**
> + * Dual-role device (DRD) work function
> + */

    And here.

> +static void usb_drd_work(struct work_struct *work)
> +{
> +	struct usb_otg *otg = container_of(work, struct usb_otg, work);
> +
> +	pm_runtime_get_sync(otg->dev);
> +	while (drd_statemachine(otg))
> +	;

    Indent it more please.

[...]
> +/**
> + * start/kick the OTG FSM if we can
> + * fsm->lock must be held
> + */

    Please follow the kernel-doc rules.

[...]
> +/**
> + * stop the OTG FSM. Stops Host & Gadget controllers as well.
> + * fsm->lock must be held
> + */

    Likewise.

[...]
> +/**
> + * usb_otg_sync_inputs - Sync OTG inputs with the OTG state machine
> + * @fsm:	OTG FSM instance

    Doesn't match the prototype.

> + *
> + * Used by the OTG driver to update the inputs to the OTG
> + * state machine.
> + *
> + * Can be called in IRQ context.
> + */
> +void usb_otg_sync_inputs(struct usb_otg *otg)
[...]
> +/**
> + * usb_otg_register_gadget - Register the gadget controller to OTG core
> + * @gadget:	gadget controller

    We call that USB device controller (UDC). I'm not sure what you meant here...
    And what about the 2nd arg, 'ops'?

[...]
> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> index 85b8fb5..5d4850a 100644
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -10,10 +10,68 @@
>  #define __LINUX_USB_OTG_H
>
>  #include <linux/phy/phy.h>
> -#include <linux/usb/phy.h>
> -#include <linux/usb/otg-fsm.h>
> +#include <linux/device.h>
> +#include <linux/usb.h>
>  #include <linux/usb/hcd.h>
> +#include <linux/usb/gadget.h>
> +#include <linux/usb/otg-fsm.h>
> +#include <linux/usb/phy.h>
> +
> +/**
> + * struct otg_hcd - host controller state and interface
> + *
> + * @hcd: host controller
> + * @irqnum: irq number
> + * @irqflags: irq flags

    IRQ?

> + * @ops: otg to host controller interface
> + * @ops: otg to host controller interface

    Once is enough. :-)

> + * @otg_dev: otg controller device

    OTG?

> +/**
> + * struct usb_otg - usb otg controller state
> + *
> + * @default_a: Indicates we are an A device. i.e. Host.
> + * @phy: USB phy interface

    PHY?

> + * @usb_phy: old usb_phy interface
> + * @host: host controller bus
> + * @gadget: gadget device
> + * @state: current otg state
> + * @dev: otg controller device
> + * @caps: otg capabilities revision, hnp, srp, etc
> + * @fsm: otg finite state machine

    OTG?

> + * @hcd_ops: host controller interface
> + * ------- internal use only -------
> + * @primary_hcd: primary host state and interface
> + * @shared_hcd: shared host state and interface
> + * @gadget_ops: gadget controller interface
> + * @list: list of otg controllers
> + * @work: otg state machine work
> + * @wq: otg state machine work queue
> + * @flags: to track if host/gadget is running
> + */
>  struct usb_otg {
>  	u8			default_a;
>
[...]
> @@ -42,26 +116,101 @@ struct usb_otg {
>
>  	/* start or continue HNP role switch */
>  	int	(*start_hnp)(struct usb_otg *otg);
> -
> +/*---------------------------------------------------------------*/
>  };
>
>  /**
> - * struct usb_otg_caps - describes the otg capabilities of the device
> - * @otg_rev: The OTG revision number the device is compliant with, it's
> - *		in binary-coded decimal (i.e. 2.0 is 0200H).
> - * @hnp_support: Indicates if the device supports HNP.
> - * @srp_support: Indicates if the device supports SRP.
> - * @adp_support: Indicates if the device supports ADP.
> + * struct usb_otg_config - otg controller configuration
> + * @caps: otg capabilities of the controller
> + * @ops: otg fsm operations

    OTG FSM?

> + * @otg_work: optional custom otg state machine work function

    OTG?

>   */

[...]

    Phew, that was a long patch... normally I don't review the patches that 
are such big. :-)

MBR, Sergei

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-09 10:16           ` Sergei Shtylyov
@ 2016-06-09 14:11             ` Alan Stern
  2016-06-10  7:01               ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Alan Stern @ 2016-06-09 14:11 UTC (permalink / raw)
  To: Sergei Shtylyov
  Cc: Roger Quadros, peter.chen, balbi, tony, gregkh, dan.j.williams,
	mathias.nyman, Joao.Pinto, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, robh, nsekhar, b-liu, linux-usb,
	linux-omap, linux-kernel, devicetree

On Thu, 9 Jun 2016, Sergei Shtylyov wrote:

> Hello.
> 
> On 6/9/2016 10:31 AM, Roger Quadros wrote:
> 
> >>>>> The OTG core will use struct otg_hcd_ops to interface
> >>>>> with the HCD controller.
> >>>>
> >>>>    Host controller driver (HCD) controller? Maybe just HC? :-)
> >>>
> >>> OK.
> >>
> >>    OTOH, my googling has shown that HCD may stand for both HC driver and HC device... The host controller device sounds a bit tautological however...
> >
> > Yeah I always meant it to be Host Controller Device :).
> 
>     The question here is more what was meant by the previous Linux USB 
> authors. :-)

I have always used "HCD" to mean Host Controller Driver, and I believe 
that's what other people have done too.

If I want to refer to a Host Controller Device, I would write either
"HC" or "host controller".

Admittedly, this means that struct usb_hcd has a slightly illogical 
name.

Alan Stern

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 11/14] usb: otg: use dev_dbg() instead of VDBG()
  2016-06-09  7:55   ` [PATCH v10 " Roger Quadros
@ 2016-06-09 15:43     ` Joe Perches
  2016-06-10  7:05       ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Joe Perches @ 2016-06-09 15:43 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree

On Thu, 2016-06-09 at 10:55 +0300, Roger Quadros wrote:
> Now that we have a device reference in struct usb_otg
> let's use dev_vdbg() for debug messages instead of VDBG().
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Acked-by: Peter Chen <peter.chen@nxp.com>
> ---
> v10:
> - in the commit message say dev_vdbg() instead of dev_dbg()

50% - partial credit, see: patch/email subject.

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface
  2016-06-09 14:11             ` Alan Stern
@ 2016-06-10  7:01               ` Roger Quadros
  0 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-10  7:01 UTC (permalink / raw)
  To: Alan Stern, Sergei Shtylyov
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree

On 09/06/16 17:11, Alan Stern wrote:
> On Thu, 9 Jun 2016, Sergei Shtylyov wrote:
> 
>> Hello.
>>
>> On 6/9/2016 10:31 AM, Roger Quadros wrote:
>>
>>>>>>> The OTG core will use struct otg_hcd_ops to interface
>>>>>>> with the HCD controller.
>>>>>>
>>>>>>    Host controller driver (HCD) controller? Maybe just HC? :-)
>>>>>
>>>>> OK.
>>>>
>>>>    OTOH, my googling has shown that HCD may stand for both HC driver and HC device... The host controller device sounds a bit tautological however...
>>>
>>> Yeah I always meant it to be Host Controller Device :).
>>
>>     The question here is more what was meant by the previous Linux USB 
>> authors. :-)
> 
> I have always used "HCD" to mean Host Controller Driver, and I believe 
> that's what other people have done too.
> 
> If I want to refer to a Host Controller Device, I would write either
> "HC" or "host controller".
> 
> Admittedly, this means that struct usb_hcd has a slightly illogical 
> name.
> 

OK, I'll re-spin this series so that HCD means HC driver.

cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core
  2016-06-09 12:34     ` Sergei Shtylyov
@ 2016-06-10  7:04       ` Roger Quadros
  2016-06-10 10:19       ` Roger Quadros
  1 sibling, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-10  7:04 UTC (permalink / raw)
  To: Sergei Shtylyov, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

Hi Sergei,

On 09/06/16 15:34, Sergei Shtylyov wrote:
> On 6/9/2016 10:53 AM, Roger Quadros wrote:
> 
>> It provides APIs for the following tasks
>>
>> - Registering an OTG/dual-role capable controller
>> - Registering Host and Gadget controllers to OTG core
>> - Providing inputs to and kicking the OTG state machine
>>
>> Provide a dual-role device (DRD) state machine.
>> DRD mode is a reduced functionality OTG mode. In this mode
>> we don't support SRP, HNP and dynamic role-swap.
>>
>> In DRD operation, the controller mode (Host or Peripheral)
>> is decided based on the ID pin status. Once a cable plug (Type-A
>> or Type-B) is attached the controller selects the state
>> and doesn't change till the cable in unplugged and a different
>> cable type is inserted.
>>
>> As we don't need most of the complex OTG states and OTG timers
>> we implement a lean DRD state machine in usb-otg.c.
>> The DRD state machine is only interested in 2 hardware inputs
>> 'id' and 'b_sess_vld'.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
> 
> [...]
> 
>> diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
>> new file mode 100644
>> index 0000000..baebe5c
>> --- /dev/null
>> +++ b/drivers/usb/common/usb-otg.c
>> @@ -0,0 +1,833 @@
> [...]
>> +/**
>> + * Change USB protocol when there is a protocol change.
>> + * fsm->lock must be held.
>> + */
> 
>    If you're using the kernel-doc comment, please follow the rules.
> 

All your comments are valid and I'll fix the issues.

<snip>

> [...]
> 
>    Phew, that was a long patch... normally I don't review the patches that are such big. :-)

Thanks for the patience and review :)

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 11/14] usb: otg: use dev_dbg() instead of VDBG()
  2016-06-09 15:43     ` Joe Perches
@ 2016-06-10  7:05       ` Roger Quadros
  0 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-10  7:05 UTC (permalink / raw)
  To: Joe Perches, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	robh, nsekhar, b-liu, linux-usb, linux-omap, linux-kernel,
	devicetree

On 09/06/16 18:43, Joe Perches wrote:
> On Thu, 2016-06-09 at 10:55 +0300, Roger Quadros wrote:
>> Now that we have a device reference in struct usb_otg
>> let's use dev_vdbg() for debug messages instead of VDBG().
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> Acked-by: Peter Chen <peter.chen@nxp.com>
>> ---
>> v10:
>> - in the commit message say dev_vdbg() instead of dev_dbg()
> 
> 50% - partial credit, see: patch/email subject.
> 
Oops. Will fix. :)

cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 13/14] usb: gadget: udc: adapt to OTG core
  2016-06-09 10:49   ` Yoshihiro Shimoda
@ 2016-06-10  7:06     ` Roger Quadros
  0 siblings, 0 replies; 52+ messages in thread
From: Roger Quadros @ 2016-06-10  7:06 UTC (permalink / raw)
  To: Yoshihiro Shimoda, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, robh, nsekhar, b-liu,
	linux-usb, linux-omap, linux-kernel, devicetree

Hi Yoshihiro,

On 09/06/16 13:49, Yoshihiro Shimoda wrote:
> Hi Roger,
> 
>> From: Roger Quadros
>> Sent: Wednesday, June 08, 2016 6:04 PM
>>
>> The OTG state machine needs a mechanism to start and
>> stop the gadget controller as well as connect/disconnect
>> from the bus. Add usb_gadget_start(), usb_gadget_stop()
>> and usb_gadget_connect_control().
>>
>> Introduce usb_otg_add_gadget_udc() to allow controller drivers
>> to register a gadget controller that is part of an OTG instance.
>>
>> Register with OTG core when UDC is added in usb_add_gadget_udc_release()
>> and unregister on usb_del_gadget_udc().
>>
>> Notify the OTG core when gadget function driver is available on
>> udc_bind_to_driver() and when it is removed in usb_gadget_remove_driver().
>>
>> We need to unlock the usb_lock mutex before calling
>> usb_otg_register_gadget() else it will cause a circular
>> locking dependency.
>>
>> Ignore softconnect sysfs control when we're in OTG
>> mode as OTG FSM should care of gadget softconnect using
>> the b_bus_req mechanism.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> ---
>>  drivers/usb/gadget/udc/udc-core.c | 202 ++++++++++++++++++++++++++++++++++++--
>>  include/linux/usb/gadget.h        |   4 +
>>  2 files changed, 196 insertions(+), 10 deletions(-)
> 
> I tried to apply this patch on the Felipe's usb.git / testing/next branch,
> but I couldn't apply because the udc-core.c was renamed to core.c.
> https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=a22b539c7082b6a3046b3a9cebb356a047a2d81d
> 
> I guess this patch needs rebase for that.

OK. I'll respin the whole series on Felipe's usb.git /testing/next.

cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core
  2016-06-09 12:34     ` Sergei Shtylyov
  2016-06-10  7:04       ` Roger Quadros
@ 2016-06-10 10:19       ` Roger Quadros
  2016-06-10 10:44         ` Sergei Shtylyov
  1 sibling, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-10 10:19 UTC (permalink / raw)
  To: Sergei Shtylyov, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

Hi,

On 09/06/16 15:34, Sergei Shtylyov wrote:
> On 6/9/2016 10:53 AM, Roger Quadros wrote:
> 
>> It provides APIs for the following tasks
>>
>> - Registering an OTG/dual-role capable controller
>> - Registering Host and Gadget controllers to OTG core
>> - Providing inputs to and kicking the OTG state machine
>>
>> Provide a dual-role device (DRD) state machine.
>> DRD mode is a reduced functionality OTG mode. In this mode
>> we don't support SRP, HNP and dynamic role-swap.
>>
>> In DRD operation, the controller mode (Host or Peripheral)
>> is decided based on the ID pin status. Once a cable plug (Type-A
>> or Type-B) is attached the controller selects the state
>> and doesn't change till the cable in unplugged and a different
>> cable type is inserted.
>>
>> As we don't need most of the complex OTG states and OTG timers
>> we implement a lean DRD state machine in usb-otg.c.
>> The DRD state machine is only interested in 2 hardware inputs
>> 'id' and 'b_sess_vld'.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
> 

<snip>

> [...]
>> +/**
>> + * usb_otg_register_gadget - Register the gadget controller to OTG core
>> + * @gadget:    gadget controller
> 
>    We call that USB device controller (UDC). I'm not sure what you meant here...
>    And what about the 2nd arg, 'ops'?

There are 2 data structures representing the Device controller.

struct usb_gadget - represents a usb slave device
struct usb_udc -struct usb_udc - describes one usb device controller

usb_udc is for private use only. usb_otg_register_gadget() takes struct usb_gadget
as argument.

Do you want me to refer to struct usb_gadget as UDC?

What is wrong with calling it gadget controller?

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core
  2016-06-10 10:19       ` Roger Quadros
@ 2016-06-10 10:44         ` Sergei Shtylyov
  2016-06-10 10:54           ` Roger Quadros
  0 siblings, 1 reply; 52+ messages in thread
From: Sergei Shtylyov @ 2016-06-10 10:44 UTC (permalink / raw)
  To: Roger Quadros, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 6/10/2016 1:19 PM, Roger Quadros wrote:

>>> It provides APIs for the following tasks
>>>
>>> - Registering an OTG/dual-role capable controller
>>> - Registering Host and Gadget controllers to OTG core
>>> - Providing inputs to and kicking the OTG state machine
>>>
>>> Provide a dual-role device (DRD) state machine.
>>> DRD mode is a reduced functionality OTG mode. In this mode
>>> we don't support SRP, HNP and dynamic role-swap.
>>>
>>> In DRD operation, the controller mode (Host or Peripheral)
>>> is decided based on the ID pin status. Once a cable plug (Type-A
>>> or Type-B) is attached the controller selects the state
>>> and doesn't change till the cable in unplugged and a different
>>> cable type is inserted.
>>>
>>> As we don't need most of the complex OTG states and OTG timers
>>> we implement a lean DRD state machine in usb-otg.c.
>>> The DRD state machine is only interested in 2 hardware inputs
>>> 'id' and 'b_sess_vld'.
>>>
>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>
>
> <snip>
>
>> [...]
>>> +/**
>>> + * usb_otg_register_gadget - Register the gadget controller to OTG core
>>> + * @gadget:    gadget controller
>>
>>    We call that USB device controller (UDC). I'm not sure what you meant here...
>>    And what about the 2nd arg, 'ops'?
>
> There are 2 data structures representing the Device controller.
>
> struct usb_gadget - represents a usb slave device
> struct usb_udc -struct usb_udc - describes one usb device controller
>
> usb_udc is for private use only. usb_otg_register_gadget() takes struct usb_gadget
> as argument.
>
> Do you want me to refer to struct usb_gadget as UDC?

    No.

> What is wrong with calling it gadget controller?

    It's not a controller, it's a piece of software AFAIU. Or is my English 
just too weak? :-)

> --
> cheers,
> -roger

MBR, Sergei

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core
  2016-06-10 10:44         ` Sergei Shtylyov
@ 2016-06-10 10:54           ` Roger Quadros
  2016-06-10 11:02             ` Felipe Balbi
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-06-10 10:54 UTC (permalink / raw)
  To: Sergei Shtylyov, peter.chen
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	jun.li, grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar,
	b-liu, linux-usb, linux-omap, linux-kernel, devicetree

On 10/06/16 13:44, Sergei Shtylyov wrote:
> On 6/10/2016 1:19 PM, Roger Quadros wrote:
> 
>>>> It provides APIs for the following tasks
>>>>
>>>> - Registering an OTG/dual-role capable controller
>>>> - Registering Host and Gadget controllers to OTG core
>>>> - Providing inputs to and kicking the OTG state machine
>>>>
>>>> Provide a dual-role device (DRD) state machine.
>>>> DRD mode is a reduced functionality OTG mode. In this mode
>>>> we don't support SRP, HNP and dynamic role-swap.
>>>>
>>>> In DRD operation, the controller mode (Host or Peripheral)
>>>> is decided based on the ID pin status. Once a cable plug (Type-A
>>>> or Type-B) is attached the controller selects the state
>>>> and doesn't change till the cable in unplugged and a different
>>>> cable type is inserted.
>>>>
>>>> As we don't need most of the complex OTG states and OTG timers
>>>> we implement a lean DRD state machine in usb-otg.c.
>>>> The DRD state machine is only interested in 2 hardware inputs
>>>> 'id' and 'b_sess_vld'.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>>
>>
>> <snip>
>>
>>> [...]
>>>> +/**
>>>> + * usb_otg_register_gadget - Register the gadget controller to OTG core
>>>> + * @gadget:    gadget controller
>>>
>>>    We call that USB device controller (UDC). I'm not sure what you meant here...
>>>    And what about the 2nd arg, 'ops'?
>>
>> There are 2 data structures representing the Device controller.
>>
>> struct usb_gadget - represents a usb slave device
>> struct usb_udc -struct usb_udc - describes one usb device controller
>>
>> usb_udc is for private use only. usb_otg_register_gadget() takes struct usb_gadget
>> as argument.
>>
>> Do you want me to refer to struct usb_gadget as UDC?
> 
>    No.
> 
>> What is wrong with calling it gadget controller?
> 
>    It's not a controller, it's a piece of software AFAIU. Or is my English just too weak? :-)

Everything at this point is a piece of software :).

struct usb_gadget, represents the gadget controller device not the driver (or software).

struct usb_gadget_driver represents the gadget function driver.
struct usb_gadget_ops represents the UDC driver ops.

--
cheers,
-roger

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core
  2016-06-10 10:54           ` Roger Quadros
@ 2016-06-10 11:02             ` Felipe Balbi
  0 siblings, 0 replies; 52+ messages in thread
From: Felipe Balbi @ 2016-06-10 11:02 UTC (permalink / raw)
  To: Roger Quadros, Sergei Shtylyov, peter.chen
  Cc: tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto, jun.li,
	grygorii.strashko, yoshihiro.shimoda.uh, robh, nsekhar, b-liu,
	linux-usb, linux-omap, linux-kernel, devicetree

[-- Attachment #1: Type: text/plain, Size: 659 bytes --]


Hi,

Roger Quadros <rogerq@ti.com> writes:
>>> What is wrong with calling it gadget controller?
>> 
>>    It's not a controller, it's a piece of software AFAIU. Or is my English just too weak? :-)
>
> Everything at this point is a piece of software :).
>
> struct usb_gadget, represents the gadget controller device not the
> driver (or software).
>
> struct usb_gadget_driver represents the gadget function driver.
> struct usb_gadget_ops represents the UDC driver ops.

right, and usb_udc was added just to have a way of linking usb_gadget
with usb_gadget_driver so we could have more than one peripheral port in
a system.

-- 
balbi

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^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 08/14] usb: otg: add OTG/dual-role core
  2016-06-09  7:24         ` Roger Quadros
@ 2016-06-12  6:26           ` Peter Chen
  2016-06-12 10:56             ` Peter Chen
  0 siblings, 1 reply; 52+ messages in thread
From: Peter Chen @ 2016-06-12  6:26 UTC (permalink / raw)
  To: Roger Quadros
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, robh, nsekhar, b-liu, linux-usb,
	linux-omap, linux-kernel, devicetree

On Thu, Jun 09, 2016 at 10:24:44AM +0300, Roger Quadros wrote:
> On 08/06/16 15:42, Peter Chen wrote:
> > On Wed, Jun 08, 2016 at 01:12:10PM +0300, Roger Quadros wrote:
> >> Hi,
> >>
> >> On 08/06/16 12:53, Peter Chen wrote:
> >>> On Wed, Jun 08, 2016 at 12:03:40PM +0300, Roger Quadros wrote:
> >>>> +int usb_otg_unregister(struct device *dev)
> >>>> +{
> >>>> +	struct usb_otg *otg;
> >>>> +
> >>>> +	mutex_lock(&otg_list_mutex);
> >>>> +	otg = usb_otg_get_data(dev);
> >>>> +	if (!otg) {
> >>>> +		dev_err(dev, "otg: %s: device not in otg list\n",
> >>>> +			__func__);
> >>>> +		mutex_unlock(&otg_list_mutex);
> >>>> +		return -EINVAL;
> >>>> +	}
> >>>> +
> >>>> +	/* prevent unregister till both host & gadget have unregistered */
> >>>> +	if (otg->host || otg->gadget) {
> >>>> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
> >>>> +			__func__);
> >>>
> >>> You need to call mutex_unlock here
> >>
> >> Indeed. good catch.
> >>>
> >>>> +
> >>>> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
> >>>> +{
> >>>
> >>> What this API is for? Why need it in this version?
> >>
> >> we moved gadget to otg registration from udc_bind_to_driver() to usb_add_gadget_udc_release().
> >> This means there is a window when gadget function driver (e.g. g_zero) is not loaded.
> >> We don't want to start the gadget controller in that window.
> >>
> >> usb_otg_gadget_ready() is used by gadget core to notify the otg core when the function driver
> >> is ready or not-ready.
> >>
> > 
> > Why you need to move this from gadget's probe to udc's probe? Currently,
> > the sequence of gadget and udc's probe is random, but udc_bind_to_driver
> > is called when udc is ready.
> > 
> Because we need to support -EPROBE_DEFER at udc probe.
> At udc_bind_to_driver there is no scope for -EPROBE_DEFER.
> 

Why udc_bind_to_driver can't return -EPROBE_DEFER if register to OTG is
failed?

> Another issue is that we need to register with otg and have otg->caps available
> before driver->bind() is called in udc_bind_to_driver(). Else gadget function
> will not have the correct OTG descriptor.
> 

You can do register before calling driver->bind.

-- 

Best Regards,
Peter Chen

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 08/14] usb: otg: add OTG/dual-role core
  2016-06-12  6:26           ` Peter Chen
@ 2016-06-12 10:56             ` Peter Chen
  0 siblings, 0 replies; 52+ messages in thread
From: Peter Chen @ 2016-06-12 10:56 UTC (permalink / raw)
  To: Roger Quadros
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, robh, nsekhar, b-liu, linux-usb,
	linux-omap, linux-kernel, devicetree

On Sun, Jun 12, 2016 at 02:26:17PM +0800, Peter Chen wrote:
> On Thu, Jun 09, 2016 at 10:24:44AM +0300, Roger Quadros wrote:
> > On 08/06/16 15:42, Peter Chen wrote:
> > > On Wed, Jun 08, 2016 at 01:12:10PM +0300, Roger Quadros wrote:
> > >> Hi,
> > >>
> > >> On 08/06/16 12:53, Peter Chen wrote:
> > >>> On Wed, Jun 08, 2016 at 12:03:40PM +0300, Roger Quadros wrote:
> > >>>> +int usb_otg_unregister(struct device *dev)
> > >>>> +{
> > >>>> +	struct usb_otg *otg;
> > >>>> +
> > >>>> +	mutex_lock(&otg_list_mutex);
> > >>>> +	otg = usb_otg_get_data(dev);
> > >>>> +	if (!otg) {
> > >>>> +		dev_err(dev, "otg: %s: device not in otg list\n",
> > >>>> +			__func__);
> > >>>> +		mutex_unlock(&otg_list_mutex);
> > >>>> +		return -EINVAL;
> > >>>> +	}
> > >>>> +
> > >>>> +	/* prevent unregister till both host & gadget have unregistered */
> > >>>> +	if (otg->host || otg->gadget) {
> > >>>> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
> > >>>> +			__func__);
> > >>>
> > >>> You need to call mutex_unlock here
> > >>
> > >> Indeed. good catch.
> > >>>
> > >>>> +
> > >>>> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
> > >>>> +{
> > >>>
> > >>> What this API is for? Why need it in this version?
> > >>
> > >> we moved gadget to otg registration from udc_bind_to_driver() to usb_add_gadget_udc_release().
> > >> This means there is a window when gadget function driver (e.g. g_zero) is not loaded.
> > >> We don't want to start the gadget controller in that window.
> > >>
> > >> usb_otg_gadget_ready() is used by gadget core to notify the otg core when the function driver
> > >> is ready or not-ready.
> > >>
> > > 
> > > Why you need to move this from gadget's probe to udc's probe? Currently,
> > > the sequence of gadget and udc's probe is random, but udc_bind_to_driver
> > > is called when udc is ready.
> > > 
> > Because we need to support -EPROBE_DEFER at udc probe.
> > At udc_bind_to_driver there is no scope for -EPROBE_DEFER.
> > 
> 
> Why udc_bind_to_driver can't return -EPROBE_DEFER if register to OTG is
> failed?
> 
> > Another issue is that we need to register with otg and have otg->caps available
> > before driver->bind() is called in udc_bind_to_driver(). Else gadget function
> > will not have the correct OTG descriptor.
> > 
> 
> You can do register before calling driver->bind.
> 

Please skip my comments, I understand your changes now.

-- 

Best Regards,
Peter Chen

^ permalink raw reply	[flat|nested] 52+ messages in thread

* Re: [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node
  2016-05-20  9:29   ` [PATCH v9 " Roger Quadros
@ 2016-05-23 21:06     ` Rob Herring
  0 siblings, 0 replies; 52+ messages in thread
From: Rob Herring @ 2016-05-23 21:06 UTC (permalink / raw)
  To: Roger Quadros
  Cc: peter.chen, balbi, tony, gregkh, dan.j.williams, mathias.nyman,
	Joao.Pinto, sergei.shtylyov, jun.li, grygorii.strashko,
	yoshihiro.shimoda.uh, nsekhar, b-liu, linux-usb, linux-omap,
	linux-kernel, devicetree

On Fri, May 20, 2016 at 12:29:59PM +0300, Roger Quadros wrote:
> The OTG controller and the USB controller can be linked via the
> 'otg-controller' property in the USB controller's device node.
> 
> of_usb_get_otg() can be used to get the OTG controller device
> from the USB controller's device node.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Acked-by: Peter Chen <peter.chen@nxp.com>
> ---
> v9:
> Clearly indicate which properties are for OTG controller and which ones
> are for host/device controllers
> 
>  Documentation/devicetree/bindings/usb/generic.txt |  7 ++++++

Acked-by: Rob Herring <robh@kernel.org>

>  drivers/usb/common/common.c                       | 27 +++++++++++++++++++++++
>  include/linux/usb/of.h                            |  9 ++++++++
>  3 files changed, 43 insertions(+)

^ permalink raw reply	[flat|nested] 52+ messages in thread

* [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node
  2016-05-13 10:03 ` [PATCH v8 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
@ 2016-05-20  9:29   ` Roger Quadros
  2016-05-23 21:06     ` Rob Herring
  0 siblings, 1 reply; 52+ messages in thread
From: Roger Quadros @ 2016-05-20  9:29 UTC (permalink / raw)
  To: peter.chen, robh
  Cc: balbi, tony, gregkh, dan.j.williams, mathias.nyman, Joao.Pinto,
	sergei.shtylyov, jun.li, grygorii.strashko, yoshihiro.shimoda.uh,
	nsekhar, b-liu, linux-usb, linux-omap, linux-kernel, devicetree

The OTG controller and the USB controller can be linked via the
'otg-controller' property in the USB controller's device node.

of_usb_get_otg() can be used to get the OTG controller device
from the USB controller's device node.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
v9:
Clearly indicate which properties are for OTG controller and which ones
are for host/device controllers

 Documentation/devicetree/bindings/usb/generic.txt |  7 ++++++
 drivers/usb/common/common.c                       | 27 +++++++++++++++++++++++
 include/linux/usb/of.h                            |  9 ++++++++
 3 files changed, 43 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index bba8257..0887d6e 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -11,6 +11,8 @@ Optional properties:
 			"peripheral" and "otg". In case this attribute isn't
 			passed via DT, USB DRD controllers should default to
 			OTG.
+
+Optional properties for OTG controllers:
  - otg-rev: tells usb driver the release number of the OTG and EH supplement
 			with which the device and its descriptors are compliant,
 			in binary-coded decimal (i.e. 2.0 is 0200H). This
@@ -25,6 +27,11 @@ Optional properties:
  - adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is
 			optional for OTG device.
 
+Optional properties for host/device controllers:
+ - otg-controller: phandle to otg controller. Host or gadget controllers can
+			contain this property to link it to a particular OTG
+			controller.
+
 This is an attribute to a USB controller such as:
 
 dwc3@4a030000 {
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index e3d0161..d7ec471 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -238,6 +238,33 @@ int of_usb_update_otg_caps(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
 
+#ifdef CONFIG_USB_OTG
+/**
+ * of_usb_get_otg - get the OTG controller linked to the USB controller
+ * @np: Pointer to the device_node of the USB controller
+ * @otg_caps: Pointer to the target usb_otg_caps to be set
+ *
+ * Returns the OTG controller device or NULL on error.
+ */
+struct device *of_usb_get_otg(struct device_node *np)
+{
+	struct device_node *otg_np;
+	struct platform_device *pdev;
+
+	otg_np = of_parse_phandle(np, "otg-controller", 0);
+	if (!otg_np)
+		return NULL;
+
+	pdev = of_find_device_by_node(otg_np);
+	of_node_put(otg_np);
+	if (!pdev)
+		return NULL;
+
+	return &pdev->dev;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_otg);
+#endif
+
 #endif
 
 MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index de3237f..499a4e8 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -40,6 +40,15 @@ static inline struct device_node *usb_of_get_child_node
 }
 #endif
 
+#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_OTG)
+struct device *of_usb_get_otg(struct device_node *np);
+#else
+static inline struct device *of_usb_get_otg(struct device_node *np)
+{
+	return NULL;
+}
+#endif
+
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
 enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np);
 #else
-- 
2.7.4

^ permalink raw reply	[flat|nested] 52+ messages in thread

end of thread, other threads:[~2016-06-12 11:02 UTC | newest]

Thread overview: 52+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
2016-06-08  9:03 ` [PATCH v9 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
2016-06-08  9:03 ` [PATCH v9 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
2016-06-08  9:03 ` [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
2016-06-08 11:39   ` Sergei Shtylyov
2016-06-08 12:04     ` Roger Quadros
2016-06-08 12:10       ` Sergei Shtylyov
2016-06-09  7:31         ` Roger Quadros
2016-06-09 10:16           ` Sergei Shtylyov
2016-06-09 14:11             ` Alan Stern
2016-06-10  7:01               ` Roger Quadros
2016-06-09  7:51   ` [PATCH v10 " Roger Quadros
2016-06-08  9:03 ` [PATCH v9 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
2016-06-08  9:03 ` [PATCH v9 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
2016-06-08  9:03 ` [PATCH v9 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
2016-06-08  9:03 ` [PATCH v9 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
2016-06-08  9:03 ` [PATCH v9 08/14] usb: otg: add OTG/dual-role core Roger Quadros
2016-06-08  9:53   ` Peter Chen
2016-06-08 10:12     ` Roger Quadros
2016-06-08 12:42       ` Peter Chen
2016-06-09  7:24         ` Roger Quadros
2016-06-12  6:26           ` Peter Chen
2016-06-12 10:56             ` Peter Chen
2016-06-09  7:53   ` [PATCH v10 " Roger Quadros
2016-06-09 12:34     ` Sergei Shtylyov
2016-06-10  7:04       ` Roger Quadros
2016-06-10 10:19       ` Roger Quadros
2016-06-10 10:44         ` Sergei Shtylyov
2016-06-10 10:54           ` Roger Quadros
2016-06-10 11:02             ` Felipe Balbi
2016-06-08  9:03 ` [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
2016-06-08  9:03 ` [PATCH v9 10/14] usb: otg: add hcd companion support Roger Quadros
2016-06-08  9:03 ` [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
2016-06-08 15:10   ` Joe Perches
2016-06-09  7:25     ` Roger Quadros
2016-06-09  7:55   ` [PATCH v10 " Roger Quadros
2016-06-09 15:43     ` Joe Perches
2016-06-10  7:05       ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 12/14] usb: hcd: Adapt to OTG core Roger Quadros
2016-06-08 11:42   ` Sergei Shtylyov
2016-06-08 12:06     ` Roger Quadros
2016-06-08 12:11       ` Sergei Shtylyov
2016-06-09  7:27         ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 13/14] usb: gadget: udc: adapt " Roger Quadros
2016-06-09 10:49   ` Yoshihiro Shimoda
2016-06-10  7:06     ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
2016-06-09  5:27 ` [PATCH v9 00/14] USB OTG/dual-role framework Peter Chen
2016-06-09  7:30   ` Roger Quadros
2016-06-09 10:13     ` Yoshihiro Shimoda
  -- strict thread matches above, loose matches on Subject: below --
2016-05-13 10:03 [PATCH v8 " Roger Quadros
2016-05-13 10:03 ` [PATCH v8 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
2016-05-20  9:29   ` [PATCH v9 " Roger Quadros
2016-05-23 21:06     ` Rob Herring

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