USB: gpio_vbus: wakeup support on GPIO VBUS interrupts

We'd like to see the system waking up from the system-wide suspend
when it gets plugged-in, or the USB cable is pulled out.

Also makes it configurable via platform data 'wakeup'.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 35 insertions, 0 deletions

diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c
index 1e6bd0347aff..bde6298a9693 100644
--- a/drivers/usb/otg/gpio_vbus.c
+++ b/drivers/usb/otg/gpio_vbus.c
@@ -327,6 +327,8 @@ static int __init gpio_vbus_probe(struct platform_device *pdev)
                 goto err_otg;
         }
 
+        device_init_wakeup(&pdev->dev, pdata->wakeup);
+
         return 0;
 err_otg:
         regulator_put(gpio_vbus->vbus_draw);
@@ -348,6 +350,7 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev)
         struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
         int gpio = pdata->gpio_vbus;
 
+        device_init_wakeup(&pdev->dev, 0);
         cancel_delayed_work_sync(&gpio_vbus->work);
         regulator_put(gpio_vbus->vbus_draw);
 
@@ -364,6 +367,33 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM
+static int gpio_vbus_pm_suspend(struct device *dev)
+{
+        struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(dev))
+                enable_irq_wake(gpio_vbus->irq);
+
+        return 0;
+}
+
+static int gpio_vbus_pm_resume(struct device *dev)
+{
+        struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(dev))
+                disable_irq_wake(gpio_vbus->irq);
+
+        return 0;
+}
+
+static const struct dev_pm_ops gpio_vbus_dev_pm_ops = {
+        .suspend        = gpio_vbus_pm_suspend,
+        .resume         = gpio_vbus_pm_resume,
+};
+#endif
+
 /* NOTE:  the gpio-vbus device may *NOT* be hotplugged */
 
 MODULE_ALIAS("platform:gpio-vbus");
@@ -372,6 +402,9 @@ static struct platform_driver gpio_vbus_driver = {
         .driver = {
                 .name  = "gpio-vbus",
                 .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm = &gpio_vbus_dev_pm_ops,
+#endif
         },
         .remove  = __exit_p(gpio_vbus_remove),
 };
diff --git a/include/linux/usb/gpio_vbus.h b/include/linux/usb/gpio_vbus.h
index d9f03ccc2d60..837bba604a0b 100644
--- a/include/linux/usb/gpio_vbus.h
+++ b/include/linux/usb/gpio_vbus.h
@@ -17,6 +17,7 @@
  * @gpio_pullup: optional D+ or D- pullup GPIO (else negative/invalid)
  * @gpio_vbus_inverted: true if gpio_vbus is active low
  * @gpio_pullup_inverted: true if gpio_pullup is active low
+ * @wakeup: configure gpio_vbus as a wake-up source
  *
  * The VBUS sensing GPIO should have a pulldown, which will normally be
  * part of a resistor ladder turning a 4.0V-5.25V level on VBUS into a
@@ -27,4 +28,5 @@ struct gpio_vbus_mach_info {
         int gpio_pullup;
         bool gpio_vbus_inverted;
         bool gpio_pullup_inverted;
+        bool wakeup;
 };