linux-kernel - Re: [PATCH v2] extcon: gpio: Add power resume support

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Message-id: <52CB6BE0.1090409@samsung.com>
Date:	Tue, 07 Jan 2014 11:52:16 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	rjying <rjying@...il.com>
Cc:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Barry Song <Barry.Song@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Workgroup.linux@....com, Rongjun Ying <rongjun.ying@....com>
Subject: Re: [PATCH v2] extcon: gpio: Add power resume support

On 12/27/2013 02:40 PM, rjying wrote:
> From: Rongjun Ying <rongjun.ying@....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@....com>
> ---
>  -v2: Add lost_sleep_irq flags.
> 
>  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 lost_sleep_irq;

I prefer 'check_on_resume' instead of 'load_sleep_irq'. 

>  };
>  
>  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->lost_sleep_irq = pdata->lost_sleep_irq;

ditto.

>  	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->lost_sleep_irq)

ditto.

> +		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,
>  	},
>  };
>  
> diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
> index 4195810..c7f0c3e 100644
> --- a/include/linux/extcon/extcon-gpio.h
> +++ b/include/linux/extcon/extcon-gpio.h
> @@ -51,6 +51,7 @@ struct gpio_extcon_platform_data {
>  	/* if NULL, "0" or "1" will be printed */
>  	const char *state_on;
>  	const char *state_off;
> +	bool lost_sleep_irq;

ditto.

>  };
>  
>  #endif /* __EXTCON_GPIO_H__ */
> 

Thanks,
Chanwoo Choi
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