[alsa-devel] [RFC 01/11] ALSA: hda - add id table support for hdac device/driver

[Vinod Koul]

On Mon, Apr 13, 2015 at 01:46:25PM +0200, Takashi Iwai wrote:
> At Sun, 12 Apr 2015 18:06:08 +0530,
> Subhransu S. Prusty wrote:
> > 
> > From: Jeeja KP <jeeja.kp at intel.com>
> > diff --git a/sound/hda/hda_bus_type.c b/sound/hda/hda_bus_type.c
> > index 519914a..8899c56 100644
> > --- a/sound/hda/hda_bus_type.c
> > +++ b/sound/hda/hda_bus_type.c
> > @@ -19,6 +19,8 @@ static int hda_bus_match(struct device *dev, struct device_driver *drv)
> >  		return 0;
> >  	if (hdrv->match)
> >  		return hdrv->match(hdev, hdrv);
> > +	if (hdrv->id_table)
> > +		return snd_hdac_bus_match_id(hdev, hdrv);
> >  	return 1;
> >  }
> >  
> > diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
> > index 3294fd4..f0ee295 100644
> > --- a/sound/hda/hdac_bus.c
> > +++ b/sound/hda/hdac_bus.c
> > @@ -195,3 +195,27 @@ void snd_hdac_bus_remove_device(struct hdac_bus *bus,
> >  	bus->num_codecs--;
> >  }
> >  EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);
> > +
> > +/**
> > + * snd_hdac_bus_match_id - bind hdac device to hdac driver.
> > + * @hdev: device.
> > + * @hdrv: driver.
> > + *
> > + */
> > +int snd_hdac_bus_match_id(struct hdac_device *dev,
> > +		 struct hdac_driver *drv)
> > +{
> > +	if (drv->id_table) {
> > +		struct hdac_device_id *id = drv->id_table;
> > +
> > +		while (id->name[0]) {
> > +			if (dev->vendor_id == id->id) {
> > +				dev->id_entry = id;
> > +				return 1;
> > +			}
> > +			id++;
> > +		}
> > +	}
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(snd_hdac_bus_match_id);
> 
> Please make these rather ASoC specific.  These ID checks aren't needed
> for the legacy driver as they need more other fields checks like
> revision id.
> 
> For example,
> 
> struct hda_soc_device {
> 	struct hdac_device core;
> 	const struct hda_soc_device_id *id_entry;
> 	....
> };
> 
> and give the match ops to hdac_driver for checking the ID.
Okay, will move these to asoc then. I am planning to move this to generic
asoc layer and not in skl driver specfic

-- 
~Vinod