linux-kernel - Re: [PATCH] rtc-cmos: fix suspend/resume

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Date:	Thu, 16 Dec 2010 22:08:19 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Daniel Drake <dsd@...top.org>
Cc:	a.zummo@...ertech.it, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, pgf@...top.org
Subject: Re: [PATCH] rtc-cmos: fix suspend/resume

On Thursday, December 16, 2010, Rafael J. Wysocki wrote:
> On Thursday, December 16, 2010, Daniel Drake wrote:
> > From: Paul Fox <pgf@...top.org>
> > 
> > rtc-cmos was setting suspend/resume hooks at the device_driver level.
> > However, the platform bus code (drivers/base/platform.c) only looks
> > for resume hooks at the dev_pm_ops level, or within the platform_driver.
> > 
> > Switch rtc_cmos to use dev_pm_ops so that suspend/resume code is
> > executed again.
> > 
> > Signed-off-by: Paul Fox <pgf@...top.org>
> > Signed-off-by: Daniel Drake <dsd@...top.org>
> > ---
> >  drivers/rtc/rtc-cmos.c |   14 +++++++++-----
> >  1 files changed, 9 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
> > index 5856167..dfa5547 100644
> > --- a/drivers/rtc/rtc-cmos.c
> > +++ b/drivers/rtc/rtc-cmos.c
> > @@ -850,7 +850,7 @@ static void __exit cmos_do_remove(struct device *dev)
> >  
> >  #ifdef	CONFIG_PM
> >  
> > -static int cmos_suspend(struct device *dev, pm_message_t mesg)
> > +static int cmos_suspend(struct device *dev)
> >  {
> >  	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
> >  	unsigned char	tmp;
> > @@ -898,7 +898,7 @@ static int cmos_suspend(struct device *dev, pm_message_t mesg)
> >   */
> >  static inline int cmos_poweroff(struct device *dev)
> >  {
> > -	return cmos_suspend(dev, PMSG_HIBERNATE);
> > +	return cmos_suspend(dev);
> >  }
> >  
> >  static int cmos_resume(struct device *dev)
> > @@ -1077,7 +1077,7 @@ static void __exit cmos_pnp_remove(struct pnp_dev *pnp)
> >  
> >  static int cmos_pnp_suspend(struct pnp_dev *pnp, pm_message_t mesg)
> >  {
> > -	return cmos_suspend(&pnp->dev, mesg);
> > +	return cmos_suspend(&pnp->dev);
> >  }
> >  
> >  static int cmos_pnp_resume(struct pnp_dev *pnp)
> > @@ -1152,13 +1152,17 @@ static void cmos_platform_shutdown(struct platform_device *pdev)
> >  /* work with hotplug and coldplug */
> >  MODULE_ALIAS("platform:rtc_cmos");
> >  
> > +static struct dev_pm_ops cmos_pm_ops = {
> > +	.suspend = cmos_suspend,
> > +	.resume = cmos_resume,
> > +};
> 
> That's not enough.  Please also specify hibernation callbacks as documented
> in Documentation/power/devices.txt (they can point to the same routines as the
> suspend/resume ones).

You can use the SIMPLE_DEV_PM_OPS() macro (defined in include/linux/pm.h)
for this purpose.

Thanks,
Rafael


> > +
> >  static struct platform_driver cmos_platform_driver = {
> >  	.remove		= __exit_p(cmos_platform_remove),
> >  	.shutdown	= cmos_platform_shutdown,
> >  	.driver = {
> >  		.name		= (char *) driver_name,
> > -		.suspend	= cmos_suspend,
> > -		.resume		= cmos_resume,
> > +		.pm = &cmos_pm_ops,
> >  	}
> >  };
> >  
> > 
> 
> 

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