On Fri, 12 Feb 2016 00:41:38 +0100, Shuah Khan wrote: > > Change ALSA driver to use Media Controller API to > share media resources with DVB and V4L2 drivers > on a AU0828 media device. 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 <shuahkh@xxxxxxxxxxxxxxx> > --- > sound/usb/Kconfig | 4 + > sound/usb/Makefile | 2 + > sound/usb/card.c | 14 +++ > sound/usb/card.h | 3 + > sound/usb/media.c | 318 +++++++++++++++++++++++++++++++++++++++++++++++ > sound/usb/media.h | 72 +++++++++++ > sound/usb/mixer.h | 3 + > sound/usb/pcm.c | 28 ++++- > sound/usb/quirks-table.h | 1 + > sound/usb/stream.c | 2 + > sound/usb/usbaudio.h | 6 + > 11 files changed, 448 insertions(+), 5 deletions(-) > create mode 100644 sound/usb/media.c > create mode 100644 sound/usb/media.h > > diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig > index a452ad7..ba117f5 100644 > --- a/sound/usb/Kconfig > +++ b/sound/usb/Kconfig > @@ -15,6 +15,7 @@ config SND_USB_AUDIO > select SND_RAWMIDI > select SND_PCM > select BITREVERSE > + select SND_USB_AUDIO_USE_MEDIA_CONTROLLER if MEDIA_CONTROLLER && MEDIA_SUPPORT Looking at the media Kconfig again, this would be broken if MEDIA_SUPPORT=m and SND_USB_AUDIO=y. The ugly workaround is something like: select SND_USB_AUDIO_USE_MEDIA_CONTROLLER \ if MEDIA_CONTROLLER && (MEDIA_SUPPORT=y || MEDIA_SUPPORT=SND) Other than that, it looks more or less OK to me. The way how media_stream_init() gets called is a bit worrisome, but it should work practically. Another concern is about the disconnection. Can all function calls in media_device_delete() be safe even if it's called while the application still opens the MC device? In anyway, such a thing can be improved later once after we get this merged, too. So, feel fee to take my ack. Acked-by: Takashi Iwai <tiwai@xxxxxxx> thanks, Takashi -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
