[alsa-devel] [PATCH RFC 1/3] sound: ac97: Add GPIO manipulation hooks

Mark Brown broonie at opensource.wolfsonmicro.com
Wed Jun 16 14:52:13 CEST 2010

On Wed, Jun 16, 2010 at 10:00:19AM +0200, Manuel Lauss wrote:
> On Wed, Jun 16, 2010 at 9:55 AM, Takashi Iwai <tiwai at suse.de> wrote:

> >> > +   void (*setgpio) (struct snd_ac97 *ac97, unsigned short gpio);
> >> > +   unsigned short (*getgpio) (struct snd_ac97 *ac97);

> > Can this be handled simply in read/write callbacks in the controller
> > side?  In callbacks, you can check whether reg == AC97_GPIO_STATUS and
> > handle differently for such an access.

> Interesting Idea, and as a bonus requires no changes to the wm97xx code.

The only thing that worries me there is any non-standard behavior the
chip may implement - it may actually want a write to that register for
some extended functionality.
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