Messages in this thread | | | Subject | Re: [alsa-devel] [PATCH v9 4/4] sound/usb: Use Media Controller API to share media resources | From | shuah <> | Date | Fri, 11 Jan 2019 07:57:49 -0700 |
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On 12/19/18 6:51 AM, Takashi Iwai wrote: > On Tue, 18 Dec 2018 18:59:39 +0100, > shuah@kernel.org wrote: >> >> From: Shuah Khan <shuah@kernel.org> >> >> 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@kernel.org> > > Feel free to take my ack regarding the sound stuff: > Reviewed-by: Takashi Iwai <tiwai@suse.de> > > > Thanks! > > Takashi >
Hi Mauro,
Any update on this patch series?
thanks, -- Shuah
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