[PATCH v3] extcon: gpio: Add power resume support

[cw00.choi@samsung.com (Chanwoo Choi)]

Hi RongJun,

On 01/07/2014 01:56 PM, RongJun Ying wrote:
> From: Rongjun Ying <rongjun.ying@csr.com>
> 
> When system on the suspend state, Some SoC can't get gpio interrupt.
> After system resume, need send extcon uevent to userspace.
> 
> Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
> Reviewed-by: Barry Song <Baohua.Song@csr.com>
> ---
>  -v3:
>  'check_on_resume' instead of 'load_sleep_irq' as Chanwoo Choi's proposal.
> 
>  drivers/extcon/extcon-gpio.c       |   20 ++++++++++++++++++++
>  include/linux/extcon/extcon-gpio.h |    1 +
>  2 files changed, 21 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
> index 7e0dff5..fde52c1 100644
> --- a/drivers/extcon/extcon-gpio.c
> +++ b/drivers/extcon/extcon-gpio.c
> @@ -40,6 +40,7 @@ struct gpio_extcon_data {
>  	int irq;
>  	struct delayed_work work;
>  	unsigned long debounce_jiffies;
> +	bool check_on_resume;
>  };
> 
>  static void gpio_extcon_work(struct work_struct *work)
> @@ -103,6 +104,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
>  	extcon_data->gpio_active_low = pdata->gpio_active_low;
>  	extcon_data->state_on = pdata->state_on;
>  	extcon_data->state_off = pdata->state_off;
> +	extcon_data->check_on_resume = pdata->check_on_resume;
>  	if (pdata->state_on && pdata->state_off)
>  		extcon_data->edev.print_state = extcon_gpio_print_state;
>  	if (pdata->debounce) {
> @@ -159,12 +161,30 @@ static int gpio_extcon_remove(struct platform_device *pdev)
>  	return 0;
>  }
> 
> +#ifdef CONFIG_PM_SLEEP
> +static int gpio_extcon_resume(struct device *dev)
> +{
> +	struct gpio_extcon_data *extcon_data;
> +
> +	extcon_data = dev_get_drvdata(dev);
> +	if (extcon_data->check_on_resume)
> +		queue_delayed_work(system_power_efficient_wq,
> +			&extcon_data->work, extcon_data->debounce_jiffies);
> +	return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops gpio_extcon_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(NULL, gpio_extcon_resume)

If CONFIG_PM_SLEEP is undefined, gpio_extcon_pm_ops cannot find gpio_extcon_resume function.
You should define dummy function for gpio_extcon_resume function.