[PATCH v4 0/4] Support mute notifications for CS35L41 HDA

[Stefan Binding <sbinding@opensource.cirrus.com>]

Some systems use a special keyboard shortcut to mute speaker audio.
On systems using CS35L41 HDA which have this shortcut, add a
mechanism which uses ACPI notifications to determine when the
shortcut is pressed, and then mute the amps inside the driver.

Since this is not a normal mute mechanism, it does not go through
userspace. To allow userspace to be able to track this special
state, add an ALSA control which tracks the state of this forced
mute

Changes since v2:
- Fixed compile issue when CONFIG_ACPI is missing

Changes since v3:
- Split first patch into 3 separate patches
- Ensure all acpi code is protected by check for CONFIG_ACPI in
realtek driver

Stefan Binding (4):
  ALSA: hda: cs35l41: Add notification support into component binding
  ALSA: hda/realtek: Support ACPI Notification framework via component
    binding
  ALSA: hda: cs35l41: Support mute notifications for CS35L41 HDA
  ALSA: hda: cs35l41: Add read-only ALSA control for forced mute

 sound/pci/hda/cs35l41_hda.c   | 132 ++++++++++++++++++++++++++++++----
 sound/pci/hda/cs35l41_hda.h   |   3 +
 sound/pci/hda/hda_component.h |   4 ++
 sound/pci/hda/patch_realtek.c |  83 ++++++++++++++++++++-
 4 files changed, 208 insertions(+), 14 deletions(-)

-- 
2.34.1