linux-kernel - Re: [linux-pm] [PATCH 4/5] input: gpio-keys: switch to new dev_pm

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Date:	Thu, 6 Aug 2009 02:51:55 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	linux-pm@...ts.linux-foundation.org
Cc:	Daniel Mack <daniel@...aq.de>,
	pHilipp Zabel <philipp.zabel@...il.com>,
	Phil Blundell <pb@...dhelds.org>, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org
Subject: Re: [linux-pm] [PATCH 4/5] input: gpio-keys: switch to new dev_pm_ops

On Thursday 06 August 2009, Daniel Mack wrote:
> On Wed, Aug 05, 2009 at 10:15:52PM +0200, pHilipp Zabel wrote:
> > On Wed, Aug 5, 2009 at 8:29 PM, Daniel Mack<daniel@...aq.de> wrote:
> > > -static int gpio_keys_resume(struct platform_device *pdev)
> > > +static int gpio_keys_resume(struct device *dev)
> > >  {
> > > -       struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
> > > +       struct gpio_keys_platform_data *pdata = dev->platform_data;
> > >        int i;
> > >
> > > -       if (device_may_wakeup(&pdev->dev)) {
> > > +       if (device_may_wakeup(dev)) {
> > >                for (i = 0; i < pdata->nbuttons; i++) {
> > >                        struct gpio_keys_button *button = &pdata->buttons[i];
> > >                        if (button->wakeup) {
> > > @@ -251,19 +251,27 @@ static int gpio_keys_resume(struct platform_device *pdev)
> > >
> > >        return 0;
> > >  }
> > > +
> > > +static struct dev_pm_ops gpio_keys_pm_ops = {
> > > +       .suspend        = gpio_keys_suspend,
> > > +       .freeze         = gpio_keys_suspend,
> > > +       .resume         = gpio_keys_resume,
> > > +       .thaw           = gpio_keys_resume,
> > 
> > I'm not sure I understand hibernation correctly, but isn't
> > .freeze/.thaw about saving state and halting/resuming the device
> > operation only?

It is.

> > It seems to me that enabling system wakeup functionality should go
> > into .poweroff. (See <linux/pm.h>)

That's correct.

And .restore() plays the role of ".resume() from hibernation".

> Frankly, I'm not sure either. But luckily, the linux-pm list is copied
> so someone can elborate on this :)

HTH

Best,
Rafael
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