[PATCH 1/2] Input: gpio_keys: report a wakeup_event for a button press on a wake_up button.

NeilBrown
2012-07-30T01:09:52Z

In order to avoid races with suspend, a wakeup event must register as
such by calling pm_wakeup_event() or pm_stay_awake(). This will ensure
that the current suspend cycle aborts.

When the user-space visible event is created in the interrupt handler
(gpio_keys_irq_isr), a simple pm_wakeup_event() with no delay is
sufficient as suspend will synchronise with all interrupt delivery.

When the user-space visible event is created later
(gpio_keys_gpio_isr), we need to bracket the event with
pm_stay_awake() and pm_relax().

Signed-off-by: NeilBrown <neilb@suse.de>
---

drivers/input/keyboard/gpio_keys.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 62bfce4..ee6e525 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -346,6 +346,8 @@ static void gpio_keys_gpio_work_func(struct work_struct *work)
container_of(work, struct gpio_button_data, work);

gpio_keys_gpio_report_event(bdata);
+ if (bdata->button->wakeup)
+ pm_relax(bdata->input->dev.parent);
}

static void gpio_keys_gpio_timer(unsigned long _data)
@@ -361,6 +363,8 @@ static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)

BUG_ON(irq != bdata->irq);

+ if (bdata->button->wakeup)
+ pm_stay_awake(bdata->input->dev.parent);
if (bdata->timer_debounce)
mod_timer(&bdata->timer,
jiffies + msecs_to_jiffies(bdata->timer_debounce));
@@ -397,6 +401,9 @@ static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
spin_lock_irqsave(&bdata->lock, flags);

if (!bdata->key_pressed) {
+ if (bdata->button->wakeup)
+ pm_wakeup_event(bdata->input->dev.parent, 0);
+
input_event(input, EV_KEY, button->code, 1);
input_sync(input);