linux-kernel - Re: [PATCH v3] extcon: gpio: Add power resume support

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Message-id: <52CDF345.6070609@samsung.com>
Date:	Thu, 09 Jan 2014 09:54:29 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Rongjun Ying <Rongjun.Ying@....com>
Cc:	RongJun Ying <rjying@...il.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Barry Song <Barry.Song@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	DL-SHA-WorkGroupLinux <DL-SHA-WorkGroupLinux@...ernal.csr.com>
Subject: Re: [PATCH v3] extcon: gpio: Add power resume support

Hi Rongjun,

OK, I applied this patch on extcon-next branch.

Thannks,
Chanwoo Choi

On 01/07/2014 06:02 PM, Rongjun Ying wrote:
> 
> 
>> -----Original Message-----
>> From: Chanwoo Choi [mailto:cw00.choi@...sung.com]
>> Sent: Tuesday, January 07, 2014 2:09 PM
>> To: RongJun Ying
>> Cc: MyungJoo Ham; Barry Song; linux-arm-kernel@...ts.infradead.org;
>> linux-kernel@...r.kernel.org; DL-SHA-WorkGroupLinux; Rongjun Ying
>> Subject: Re: [PATCH v3] extcon: gpio: Add power resume support
>>
>> Hi RongJun,
>>
>> On 01/07/2014 01:56 PM, RongJun Ying 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>
>>> Reviewed-by: Barry Song <Baohua.Song@....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.
>>
>>
> In the include/Linux/pm.h
> If CONFIG_PM_SLEEP is undefined, the SET_SYSTEM_SLEEP_PM_OPS macro is bypassed.
> 
> #ifdef CONFIG_PM_SLEEP
> #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
>         .suspend = suspend_fn, \
>         .resume = resume_fn, \
>         .freeze = suspend_fn, \
>         .thaw = resume_fn, \
>         .poweroff = suspend_fn, \
>         .restore = resume_fn,
> #else
> #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
> #endif
>>
>>
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