Input: gpio-keys - add suspend/resume support

This patch adds suspend/resume support and enables wakeup from
gpio_keys buttons.

Signed-off-by: Anti Sullin <anti.sullin@artecdesign.ee>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

2 files changed, 53 insertions, 0 deletions

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index b3069bc00f03..3d6820b4465b 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -55,6 +55,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
         struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
         struct input_dev *input;
         int i, error;
+        int wakeup = 0;
 
         input = input_allocate_device();
         if (!input)
@@ -100,6 +101,9 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
                         goto fail;
                 }
 
+                if (button->wakeup)
+                        wakeup = 1;
+
                 input_set_capability(input, type, button->code);
         }
 
@@ -111,6 +115,8 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
                 goto fail;
         }
 
+        device_init_wakeup(&pdev->dev, wakeup);
+
         return 0;
 
  fail:
@@ -129,6 +135,8 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
         struct input_dev *input = platform_get_drvdata(pdev);
         int i;
 
+        device_init_wakeup(&pdev->dev, 0);
+
         for (i = 0; i < pdata->nbuttons; i++) {
                 int irq = gpio_to_irq(pdata->buttons[i].gpio);
                 free_irq(irq, pdev);
@@ -139,9 +147,53 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
         return 0;
 }
 
+
+#ifdef CONFIG_PM
+static int gpio_keys_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+        int i;
+
+        if (device_may_wakeup(&pdev->dev)) {
+                for (i = 0; i < pdata->nbuttons; i++) {
+                        struct gpio_keys_button *button = &pdata->buttons[i];
+                        if (button->wakeup) {
+                                int irq = gpio_to_irq(button->gpio);
+                                enable_irq_wake(irq);
+                        }
+                }
+        }
+
+        return 0;
+}
+
+static int gpio_keys_resume(struct platform_device *pdev)
+{
+        struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+        int i;
+
+        if (device_may_wakeup(&pdev->dev)) {
+                for (i = 0; i < pdata->nbuttons; i++) {
+                        struct gpio_keys_button *button = &pdata->buttons[i];
+                        if (button->wakeup) {
+                                int irq = gpio_to_irq(button->gpio);
+                                disable_irq_wake(irq);
+                        }
+                }
+        }
+
+        return 0;
+}
+#else
+#define gpio_keys_suspend       NULL
+#define gpio_keys_resume        NULL
+#endif
+
 struct platform_driver gpio_keys_device_driver = {
         .probe          = gpio_keys_probe,
         .remove         = __devexit_p(gpio_keys_remove),
+        .suspend        = gpio_keys_suspend,
+        .resume         = gpio_keys_resume,
         .driver         = {
                 .name   = "gpio-keys",
         }
diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h
index 265d17830a0f..c6d3a9de5634 100644
--- a/include/linux/gpio_keys.h
+++ b/include/linux/gpio_keys.h
@@ -8,6 +8,7 @@ struct gpio_keys_button {
         int active_low;
         char *desc;
         int type;               /* input event type (EV_KEY, EV_SW) */
+        int wakeup;             /* configure the button as a wake-up source */
 };
 
 struct gpio_keys_platform_data {