[PATCH 0/2] [PART 3/4] USB: ohci-da8xx: Remove platform callbacks

[PATCH 0/2] [PART 3/4] USB: ohci-da8xx: Remove platform callbacks

[Axel Haslam]

There are no more users of the platform callbacks as
all of them have been converted to use a regulator.

We can now remove the plafrom callbacks from the driver and the platform
data structure.

DEPENDENCIES:
1. [PATCH 0/3] fix ohci phy name
https://lkml.org/lkml/2016/11/2/208
2. [PATCH/RFC v2 0/3] regulator: handling of error conditions for usb drivers
https://lkml.org/lkml/2016/11/3/188
3. [PATCH v4 0/3] [PART 1/4] USB: ohci-da8xx: Allow a regulator for VBUS and over current
4. [PATCH 0/3] [PART 2/4] ARM: davinci: OHCI: Use a regulator instead of callbacks

A branch with all the dependencies can be found here:
https://github.com/axelhaslamx/linux-axel/commits/ohci-da8xx-dt-v4

Axel Haslam (2):
  USB: ohci: da8xx: Remove ohci platform callbacks
  USB: ohci: da8xx: use a flag instead of mask for ocic

 drivers/usb/host/ohci-da8xx.c             | 101 ++++--------------------------
 include/linux/platform_data/usb-davinci.h |  20 ------
 2 files changed, 12 insertions(+), 109 deletions(-)

-- 
2.10.1

[PATCH 1/2] USB: ohci: da8xx: Remove ohci platform callbacks

[Axel Haslam]

Now that all ohci users are are using a regulator, we can
remove the platform callbacks and data.

potpgt is no longer necessary as a power on delay time can
be specified for the regulator itself.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---
 drivers/usb/host/ohci-da8xx.c             | 84 ++-----------------------------
 include/linux/platform_data/usb-davinci.h | 20 --------
 2 files changed, 5 insertions(+), 99 deletions(-)

diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
index 0a4b885..3dcbf1f 100644
--- a/drivers/usb/host/ohci-da8xx.c
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -89,12 +89,8 @@ static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
 {
 	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
 	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
 	int ret;
 
-	if (hub && hub->set_power)
-		return hub->set_power(1, on);
-
 	if (!da8xx_ohci->vbus_reg)
 		return 0;
 
@@ -121,11 +117,6 @@ static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
 static int ohci_da8xx_get_power(struct usb_hcd *hcd)
 {
 	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
-	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
-
-	if (hub && hub->get_power)
-		return hub->get_power(1);
 
 	if (da8xx_ohci->vbus_reg)
 		return regulator_is_enabled(da8xx_ohci->vbus_reg);
@@ -137,13 +128,9 @@ static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
 {
 	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
 	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
 	unsigned int flags;
 	int ret;
 
-	if (hub && hub->get_oci)
-		return hub->get_oci(1);
-
 	if (!da8xx_ohci->vbus_reg)
 		return 0;
 
@@ -159,29 +146,9 @@ static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
 	return 0;
 }
 
-static int ohci_da8xx_has_set_power(struct usb_hcd *hcd)
+static int ohci_da8xx_has_regulator(struct usb_hcd *hcd)
 {
 	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
-	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
-
-	if (hub && hub->set_power)
-		return 1;
-
-	if (da8xx_ohci->vbus_reg)
-		return 1;
-
-	return 0;
-}
-
-static int ohci_da8xx_has_oci(struct usb_hcd *hcd)
-{
-	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
-	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
-
-	if (hub && hub->get_oci)
-		return 1;
 
 	if (da8xx_ohci->vbus_reg)
 		return 1;
@@ -189,30 +156,9 @@ static int ohci_da8xx_has_oci(struct usb_hcd *hcd)
 	return 0;
 }
 
-static int ohci_da8xx_has_potpgt(struct usb_hcd *hcd)
-{
-	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
-
-	if (hub && hub->potpgt)
-		return 1;
-
-	return 0;
-}
-
 /*
  * Handle the port over-current indicator change.
  */
-static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
-				    unsigned port)
-{
-	ocic_mask |= 1 << port;
-
-	/* Once over-current is detected, the port needs to be powered down */
-	if (hub->get_oci(port) > 0)
-		hub->set_power(port, 0);
-}
-
 static int ohci_da8xx_regulator_event(struct notifier_block *nb,
 				unsigned long event, void *data)
 {
@@ -233,12 +179,9 @@ static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
 {
 	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
 	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
 	int ret = 0;
 
-	if (hub && hub->ocic_notify)
-		ret = hub->ocic_notify(ohci_da8xx_ocic_handler);
-	else if (da8xx_ohci->vbus_reg) {
+	if (da8xx_ohci->vbus_reg) {
 		da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event;
 		ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg,
 						&da8xx_ohci->nb);
@@ -250,19 +193,9 @@ static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
 	return ret;
 }
 
-static void ohci_da8xx_unregister_notify(struct usb_hcd *hcd)
-{
-	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
-
-	if (hub && hub->ocic_notify)
-		hub->ocic_notify(NULL);
-}
-
 static int ohci_da8xx_reset(struct usb_hcd *hcd)
 {
 	struct device *dev		= hcd->self.controller;
-	struct da8xx_ohci_root_hub *hub	= dev_get_platdata(dev);
 	struct ohci_hcd	*ohci		= hcd_to_ohci(hcd);
 	int result;
 	u32 rh_a;
@@ -291,20 +224,14 @@ static int ohci_da8xx_reset(struct usb_hcd *hcd)
 	 * register's default value, so that ohci_hub_control() could return
 	 * the correct hub descriptor...
 	 */
-	rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
-	if (ohci_da8xx_has_set_power(hcd)) {
+	if (ohci_da8xx_has_regulator(hcd)) {
+		rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
 		rh_a &= ~RH_A_NPS;
 		rh_a |=  RH_A_PSM;
-	}
-	if (ohci_da8xx_has_oci(hcd)) {
 		rh_a &= ~RH_A_NOCP;
 		rh_a |=  RH_A_OCPM;
+		ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
 	}
-	if (ohci_da8xx_has_potpgt(hcd)) {
-		rh_a &= ~RH_A_POTPGT;
-		rh_a |= hub->potpgt << 24;
-	}
-	ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
 
 	return result;
 }
@@ -479,7 +406,6 @@ static int ohci_da8xx_remove(struct platform_device *pdev)
 {
 	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
 
-	ohci_da8xx_unregister_notify(hcd);
 	usb_remove_hcd(hcd);
 	usb_put_hcd(hcd);
 
diff --git a/include/linux/platform_data/usb-davinci.h b/include/linux/platform_data/usb-davinci.h
index 0926e99..58f4be0 100644
--- a/include/linux/platform_data/usb-davinci.h
+++ b/include/linux/platform_data/usb-davinci.h
@@ -11,26 +11,6 @@
 #ifndef __ASM_ARCH_USB_H
 #define __ASM_ARCH_USB_H
 
-struct	da8xx_ohci_root_hub;
-
-typedef void (*da8xx_ocic_handler_t)(struct da8xx_ohci_root_hub *hub,
-				     unsigned port);
-
-/* Passed as the platform data to the OHCI driver */
-struct	da8xx_ohci_root_hub {
-	/* Switch the port power on/off */
-	int	(*set_power)(unsigned port, int on);
-	/* Read the port power status */
-	int	(*get_power)(unsigned port);
-	/* Read the port over-current indicator */
-	int	(*get_oci)(unsigned port);
-	/* Over-current indicator change notification (pass NULL to disable) */
-	int	(*ocic_notify)(da8xx_ocic_handler_t handler);
-
-	/* Time from power on to power good (in 2 ms units) */
-	u8	potpgt;
-};
-
 void davinci_setup_usb(unsigned mA, unsigned potpgt_ms);
 
 #endif	/* ifndef __ASM_ARCH_USB_H */
-- 
2.10.1

[PATCH 2/2] USB: ohci: da8xx: use a flag instead of mask for ocic

[Axel Haslam]

Now that the platform callback is removed, we can move the over
current indictor changed flag to the private data structure.

Since the driver only handles a single port, there is no need
for ocic to be a mask, we can use a simple flag instead.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---
 drivers/usb/host/ohci-da8xx.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
index 3dcbf1f..83b182e 100644
--- a/drivers/usb/host/ohci-da8xx.c
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -43,12 +43,10 @@ struct da8xx_ohci_hcd {
 	struct regulator *vbus_reg;
 	struct notifier_block nb;
 	unsigned int is_powered;
+	unsigned int oc_changed;
 };
 #define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
 
-/* Over-current indicator change bitmask */
-static volatile u16 ocic_mask;
-
 static int ohci_da8xx_enable(struct usb_hcd *hcd)
 {
 	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
@@ -168,7 +166,7 @@ static int ohci_da8xx_regulator_event(struct notifier_block *nb,
 
 	if (event & REGULATOR_EVENT_OVER_CURRENT) {
 		dev_warn(dev, "over current event\n");
-		ocic_mask |= 1;
+		da8xx_ohci->oc_changed = 1;
 		ohci_da8xx_set_power(da8xx_ohci->hcd, 0);
 	}
 
@@ -241,10 +239,11 @@ static int ohci_da8xx_reset(struct usb_hcd *hcd)
  */
 static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
 {
+	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
 	int length		= orig_ohci_hub_status_data(hcd, buf);
 
 	/* See if we have OCIC bit set on port 1 */
-	if (ocic_mask & (1 << 1)) {
+	if (da8xx_ohci->oc_changed) {
 		dev_dbg(hcd->self.controller, "over-current indicator change "
 			"on port 1\n");
 
@@ -262,6 +261,7 @@ static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
 static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 				  u16 wIndex, char *buf, u16 wLength)
 {
+	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
 	struct device *dev		= hcd->self.controller;
 	int temp;
 
@@ -284,7 +284,7 @@ static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 			temp |=  RH_PS_POCI;
 
 		/* The over-current indicator change (OCIC) bit is 0 too */
-		if (ocic_mask & (1 << wIndex))
+		if (da8xx_ohci->oc_changed)
 			temp |=  RH_PS_OCIC;
 
 		put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
@@ -311,10 +311,7 @@ static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 				temp ? "Set" : "Clear", wIndex,
 				"C_OVER_CURRENT");
 
-			if (temp)
-				ocic_mask |= 1 << wIndex;
-			else
-				ocic_mask &= ~(1 << wIndex);
+			da8xx_ohci->oc_changed = temp;
 			return 0;
 		}
 	}
-- 
2.10.1