power: collie_battery: support generating wakeup event

Teach collie_battery driver to communicate to the kernel that it can
generate wakeup events. Handle enabling/disabling wakeup on battery full
event in suspend/resume callbacks.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

diff --git a/drivers/power/collie_battery.c b/drivers/power/collie_battery.c
index d02ae02..594e4db 100644 (file)
--- a/drivers/power/collie_battery.c
+++ b/drivers/power/collie_battery.c
@@ -26,6 +26,7 @@
 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
 static struct work_struct bat_work;
 static struct ucb1x00 *ucb;
+static int wakeup_enabled;
 
 struct collie_bat {
        int status;
@@ -291,11 +292,21 @@ static int collie_bat_suspend(struct ucb1x00_dev *dev)
 {
        /* flush all pending status updates */
        flush_work(&bat_work);
+
+       if (device_may_wakeup(&dev->ucb->dev) &&
+           collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
+               wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
+       else
+               wakeup_enabled = 0;
+
        return 0;
 }
 
 static int collie_bat_resume(struct ucb1x00_dev *dev)
 {
+       if (wakeup_enabled)
+               disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
+
        /* things may have changed while we were away */
        schedule_work(&bat_work);
        return 0;
@@ -334,10 +345,15 @@ static int collie_bat_probe(struct ucb1x00_dev *dev)
                                collie_bat_gpio_isr,
                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
                                "main full", &collie_bat_main);
-       if (!ret) {
-               schedule_work(&bat_work);
-               return 0;
-       }
+       if (ret)
+               goto err_irq;
+
+       device_init_wakeup(&ucb->dev, 1);
+       schedule_work(&bat_work);
+
+       return 0;
+
+err_irq:
        power_supply_unregister(&collie_bat_bu.psy);
 err_psy_reg_bu:
        power_supply_unregister(&collie_bat_main.psy);