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

    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);

    + 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)
    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);

     \ /
      Last update: 2012-07-30 04:01    [W:0.024 / U:35.056 seconds]
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