[RFC PATCH] Input: gpio_keys - trigger input event if key is pressed in boot stage

[Barry Song <21cnbao@gmail.com>]

sometimes we press a key to boot, and the boot stage need to get this
event.
the current codes use edge trigger, so we have no chance to report
the cold-touch event.
but our user sceneries like Linux navigator does need it.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
---
 -RFC: for the moment, only an idea

 drivers/input/keyboard/gpio_keys.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/input/keyboard/gpio_keys.c
b/drivers/input/keyboard/gpio_keys.c
index ddf4045..77fe0dd 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -766,6 +766,19 @@ static int gpio_keys_probe(struct platform_device *pdev)

     device_init_wakeup(&pdev->dev, wakeup);

+    /* if the key is pressed while system boot, force an interrupt */
+    for (i = 0; i < pdata->nbuttons; i++) {
+        const struct gpio_keys_button *button = &pdata->buttons[i];
+        struct gpio_button_data *bdata = &ddata->data[i];
+        int state;
+
+        if (gpio_is_valid(button->gpio)) {
+            state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^
button->active_low;
+            if (state)
+                gpio_keys_gpio_isr(bdata->irq, bdata);
+        }
+    }
+
     return 0;

 err_remove_group:
-- 
1.9.1