linux-kernel - Re: [PATCH 1/1] extcon: gpio: Add power resume support

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Date:	Mon, 23 Dec 2013 13:20:00 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	rjying <rjying@...il.com>
Cc:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	linux-kernel@...r.kernel.org, Barry Song <21cnbao@...il.com>,
	RongJun Ying <Rongjun.Ying@....com>,
	Binghua Duan <Binghua.Duan@....com>
Subject: Re: [PATCH 1/1] extcon: gpio: Add power resume support

On 12/20/2013 05:09 PM, rjying wrote:
> From: Rongjun Ying <rongjun.ying@....com>
> 
> After system resume, need send extcon uevent to userspace

Why did extcon send uevent after wakeup from suspend?

If extcon cable is attatched or detached on suspend state,
Kernel can detect the interrupt about changed state of extcon.
So, kernel would execute proper operation about interrupt
after wakeup from suspend state.

I think it isn't necessary.

Thanks,
Chanwoo Choi

> 
> Change-Id: I32a9e1c6646035f95765bba79a7acaccb8ce45a7
> 
> Signed-off-by: Rongjun Ying <rongjun.ying@....com>
> ---
>  drivers/extcon/extcon-gpio.c |   17 +++++++++++++++++
>  1 files changed, 17 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
> index 7e0dff5..d916522 100644
> --- a/drivers/extcon/extcon-gpio.c
> +++ b/drivers/extcon/extcon-gpio.c
> @@ -159,12 +159,29 @@ 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);
> +	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)
> +};
> +
>  static struct platform_driver gpio_extcon_driver = {
>  	.probe		= gpio_extcon_probe,
>  	.remove		= gpio_extcon_remove,
>  	.driver		= {
>  		.name	= "extcon-gpio",
>  		.owner	= THIS_MODULE,
> +		.pm = &gpio_extcon_pm_ops,
>  	},
>  };
>  
> 

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