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Input: gpio_keys - report a wakeup_event for a button press 

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>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
NeilBrown 2012-07-29 22:18:47 -07:00 committed by Dmitry Torokhov
parent 219edc7178
commit 2fba26c659
1 changed files with 8 additions and 0 deletions
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8
drivers/input/keyboard/gpio_keys.c
View File

@ -344,6 +344,9 @@ 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)
@ -359,6 +362,8 @@ 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));
@ -395,6 +400,9 @@ 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);