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

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Message-ID: <86130EF012BDF348AA0D464A4F449478012AC858E6@SHAASIEXM01.ASIA.ROOT.PRI>
Date:	Tue, 7 Jan 2014 09:02:19 +0000
From:	Rongjun Ying <Rongjun.Ying@....com>
To:	Chanwoo Choi <cw00.choi@...sung.com>,
	RongJun Ying <rjying@...il.com>
CC:	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



> -----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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