usb: otg: gpio_vbus: Add otg transceiver events and notifiers

Commit 9ad63986c606 (pda_power: Add support for using otg transceiver events)
converted the pda-power driver to use otg events to determine the status
of the power supply.

As gpio-vbus didn't use otg events until now, this change breaks setups
of pda-power with a gpio-vbus transceiver.

This patch adds the necessary otg events and notifiers to gpio-vbus.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Dima Zavin <dima@android.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c
index 3ece43a2e4c1..a0a2178974fe 100644
--- a/drivers/usb/otg/gpio_vbus.c
+++ b/drivers/usb/otg/gpio_vbus.c
@@ -96,7 +96,7 @@ static void gpio_vbus_work(struct work_struct *work)
         struct gpio_vbus_data *gpio_vbus =
                 container_of(work, struct gpio_vbus_data, work);
         struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
-        int gpio;
+        int gpio, status;
 
         if (!gpio_vbus->phy.otg->gadget)
                 return;
@@ -108,7 +108,9 @@ static void gpio_vbus_work(struct work_struct *work)
          */
         gpio = pdata->gpio_pullup;
         if (is_vbus_powered(pdata)) {
+                status = USB_EVENT_VBUS;
                 gpio_vbus->phy.state = OTG_STATE_B_PERIPHERAL;
+                gpio_vbus->phy.last_event = status;
                 usb_gadget_vbus_connect(gpio_vbus->phy.otg->gadget);
 
                 /* drawing a "unit load" is *always* OK, except for OTG */
@@ -117,6 +119,9 @@ static void gpio_vbus_work(struct work_struct *work)
                 /* optionally enable D+ pullup */
                 if (gpio_is_valid(gpio))
                         gpio_set_value(gpio, !pdata->gpio_pullup_inverted);
+
+                atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
+                                           status, gpio_vbus->phy.otg->gadget);
         } else {
                 /* optionally disable D+ pullup */
                 if (gpio_is_valid(gpio))
@@ -125,7 +130,12 @@ static void gpio_vbus_work(struct work_struct *work)
                 set_vbus_draw(gpio_vbus, 0);
 
                 usb_gadget_vbus_disconnect(gpio_vbus->phy.otg->gadget);
+                status = USB_EVENT_NONE;
                 gpio_vbus->phy.state = OTG_STATE_B_IDLE;
+                gpio_vbus->phy.last_event = status;
+
+                atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
+                                           status, gpio_vbus->phy.otg->gadget);
         }
 }
 
@@ -287,6 +297,9 @@ static int __init gpio_vbus_probe(struct platform_device *pdev)
                         irq, err);
                 goto err_irq;
         }
+
+        ATOMIC_INIT_NOTIFIER_HEAD(&gpio_vbus->phy.notifier);
+
         INIT_WORK(&gpio_vbus->work, gpio_vbus_work);
 
         gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw");