Re: [alsa-devel] [PATCH v9 4/4] sound/usb: Use Media Controller API to share media resources

[shuah]

On 1/11/19 7:59 AM, Hans Verkuil wrote:
> On 1/11/19 3:57 PM, shuah wrote:
> > On 12/19/18 6:51 AM, Takashi Iwai wrote:
> > > On Tue, 18 Dec 2018 18:59:39 +0100,
> > > shuah@xxxxxxxxxx wrote:
> > > > From: Shuah Khan <shuah@xxxxxxxxxx>
> > > >
> > > > Media Device Allocator API to allows multiple drivers share a media device.
> > > > This API solves a very common use-case for media devices where one physical
> > > > device (an USB stick) provides both audio and video. When such media device
> > > > exposes a standard USB Audio class, a proprietary Video class, two or more
> > > > independent drivers will share a single physical USB bridge. In such cases,
> > > > it is necessary to coordinate access to the shared resource.
> > > >
> > > > Using this API, drivers can allocate a media device with the shared struct
> > > > device as the key. Once the media device is allocated by a driver, other
> > > > drivers can get a reference to it. The media device is released when all
> > > > the references are released.
> > > >
> > > > Change the ALSA driver to use the Media Controller API to share media
> > > > resources with DVB, and V4L2 drivers on a AU0828 media device.
> > > >
> > > > The Media Controller specific initialization is done after sound card is
> > > > registered. ALSA creates Media interface and entity function graph nodes
> > > > for Control, Mixer, PCM Playback, and PCM Capture devices.
> > > >
> > > > snd_usb_hw_params() will call Media Controller enable source handler
> > > > interface to request the media resource. If resource request is granted,
> > > > it will release it from snd_usb_hw_free(). If resource is busy, -EBUSY is
> > > > returned.
> > > >
> > > > Media specific cleanup is done in usb_audio_disconnect().
> > > >
> > > > Signed-off-by: Shuah Khan <shuah@xxxxxxxxxx>
> > >
> > > Feel free to take my ack regarding the sound stuff:
> > >  ÂÂ Reviewed-by: Takashi Iwai <tiwai@xxxxxxx>
> > >
> > >
> > > Thanks!
> > >
> > > Takashi
> >
> > Hi Mauro,
> >
> > Any update on this patch series?
>
> I'm planning to process this series for 5.1. Haven't gotten around to it yet,
> but I expect to do this next week.
>
> Still going through all the pending patches after the Christmas period :-)
>
> Regards,
>
> 	Hans

Hans,

Thanks for a quick reply. No worries. I am recovering from the Christmas
and vacation myself. :)

thanks,
-- Shuah