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