extcon: gpio: Add power resume support

When system on the suspend state, Some SoC can't get gpio interrupt.
After system resume, need send extcon uevent to userspace.

Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
Reviewed-by: Barry Song <Baohua.Song@csr.com>
Acked-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

2 files changed, 22 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 4736a9c57efa..a63a6b21c9ad 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -40,6 +40,7 @@ struct gpio_extcon_data {
         int irq;
         struct delayed_work work;
         unsigned long debounce_jiffies;
+        bool check_on_resume;
 };
 
 static void gpio_extcon_work(struct work_struct *work)
@@ -103,6 +104,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
         extcon_data->gpio_active_low = pdata->gpio_active_low;
         extcon_data->state_on = pdata->state_on;
         extcon_data->state_off = pdata->state_off;
+        extcon_data->check_on_resume = pdata->check_on_resume;
         if (pdata->state_on && pdata->state_off)
                 extcon_data->edev.print_state = extcon_gpio_print_state;
 
@@ -160,12 +162,31 @@ static int gpio_extcon_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int gpio_extcon_resume(struct device *dev)
+{
+        struct gpio_extcon_data *extcon_data;
+
+        extcon_data = dev_get_drvdata(dev);
+        if (extcon_data->check_on_resume)
+                queue_delayed_work(system_power_efficient_wq,
+                        &extcon_data->work, extcon_data->debounce_jiffies);
+
+        return 0;
+}
+#endif
+
+static const struct dev_pm_ops gpio_extcon_pm_ops = {
+        SET_SYSTEM_SLEEP_PM_OPS(NULL, gpio_extcon_resume)
+};
+
 static struct platform_driver gpio_extcon_driver = {
         .probe          = gpio_extcon_probe,
         .remove         = gpio_extcon_remove,
         .driver         = {
                 .name   = "extcon-gpio",
                 .owner  = THIS_MODULE,
+                .pm     = &gpio_extcon_pm_ops,
         },
 };
 
diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
index 4195810f87fe..8900fdf511c6 100644
--- a/include/linux/extcon/extcon-gpio.h
+++ b/include/linux/extcon/extcon-gpio.h
@@ -51,6 +51,7 @@ struct gpio_extcon_platform_data {
         /* if NULL, "0" or "1" will be printed */
         const char *state_on;
         const char *state_off;
+        bool check_on_resume;
 };
 
 #endif /* __EXTCON_GPIO_H__ */