[alsa-devel] [PATCH v3 0/2] Update ALSA driver to use media controller API

[Shuah Khan]

This patch series updates ALSA driver to use media controller
API to share tuner with DVB and V4L2 drivers that control AU0828
media device. Two new interfaces are added to media controller
API to enable creating media device as a device resource. This
allows creating media device as a device resource on the main
struct device that is common to all drivers that control a single
media hardware and share resources on it. Drivers then can find
the common media device to register entities and manage links,
and pipelines.

Tested with and without CONFIG_MEDIA_CONTROLLER enabled.
Tested tuner entity doesn't exist case as au0828 v4l2
driver is the one that will create the tuner when it gets
updated to use media controller API.

Please note that au0828 updates media controller are necessary
before the resource sharing can work across ALSA and au0828
dvb and v4l2 drivers. This work is in progress and another
developer is working on it.

Changes since v1:
- Moved media specific code into new header and source file
- Created a new structure for media controller specific fields
- Added a new define USE_MEDIA_CONTROLLER to add media specific
  code. This new define is defined only when Media Controller
  support is enabled. New media specific code is active only
  when this define is defined.
- Moved media_deviced_delete() check under !was_shutdown block
- Removed return check for media_device_init()
- Changed new Media Controller interface names for clarity. Now
  they are named media_device_get_devres() and
  media_device_find_devres().
- Calling media_entity_pipeline_stop() on a pipe that isn't active
  appears to be safe. This needs further testing once AU0828
  media controller patches are ready.

Changes since v2:
- Moved checks to define USE_MEDIA_CONTROLLER to Makefile 
- Moved stubs for media controller specific functions to header
  file.
- Added new register_notify operation to media_entity_operations
  structure. This new hook is called when a new entity is
  registered to allow other entities associated with the
  media device to create link as needed.
- Added a new field to struct media_entity for entity owners
  to save their private data.
- Is it safe for ALSA to call media_entity_remove_links()?
  Laurent Pinchart, please comment.
- Do start/stop pipeline functions have to be concered about
  V4l2? Are they safe the way they are?
  Hans, please comment.

Shuah Khan (2):
  media: media controller entity framework enhancements for ALSA
  sound/usb: Update ALSA driver to use media controller API

 drivers/media/media-device.c |   7 ++
 include/media/media-entity.h |   4 +
 sound/usb/Makefile           |  15 +++-
 sound/usb/card.c             |   5 ++
 sound/usb/card.h             |   1 +
 sound/usb/media.c            | 185 +++++++++++++++++++++++++++++++++++++++++++
 sound/usb/media.h            |  47 +++++++++++
 sound/usb/pcm.c              |  10 ++-
 sound/usb/quirks-table.h     |   1 +
 sound/usb/quirks.c           |   9 ++-
 sound/usb/stream.c           |   3 +
 sound/usb/usbaudio.h         |   1 +
 12 files changed, 285 insertions(+), 3 deletions(-)
 create mode 100644 sound/usb/media.c
 create mode 100644 sound/usb/media.h

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2.1.4