From: Roger Quadros <rogerq@ti.com>
To: <peter.chen@freescale.com>
Cc: <balbi@kernel.org>, <tony@atomide.com>,
<gregkh@linuxfoundation.org>, <dan.j.williams@intel.com>,
<mathias.nyman@linux.intel.com>, <Joao.Pinto@synopsys.com>,
<sergei.shtylyov@cogentembedded.com>, <jun.li@freescale.com>,
<grygorii.strashko@ti.com>, <yoshihiro.shimoda.uh@renesas.com>,
<robh@kernel.org>, <nsekhar@ti.com>, <b-liu@ti.com>,
<linux-usb@vger.kernel.org>, <linux-omap@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
Roger Quadros <rogerq@ti.com>
Subject: [PATCH v9 13/14] usb: gadget: udc: adapt to OTG core
Date: Wed, 8 Jun 2016 12:03:45 +0300 [thread overview]
Message-ID: <1465376626-30122-14-git-send-email-rogerq@ti.com> (raw)
In-Reply-To: <1465376626-30122-1-git-send-email-rogerq@ti.com>
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
next prev parent reply other threads:[~2016-06-08 9:06 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
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 ` Roger Quadros [this message]
2016-06-09 10:49 ` [PATCH v9 13/14] usb: gadget: udc: adapt " 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
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