[PATCH 0/6][SRU][M] Support speaker mute hotkey for Cirrus CS35L41 HDA codec

[Chris Chiu]

BugLink: https://bugs.launchpad.net/bugs/2039151

[Impact]
Some systems use a special hotkey to mute speaker audio. On systems using CS35L41 HDA which have this hotkey, add a mechanism which uses ACPI notifications to detect whether the hotkey is triggered to switch the mute state.

[Fix]
Backport the fix from Cirrus on linux-next https://lore.kernel.org/alsa-devel/87fs36egnv.wl-tiwai@suse.de/T/#t.

[Test Case]
1. Power on the machine with CS35L41 HDA and the speaker mute hotkey.
2. Verify the audio functions
3. Verify if the speaker can be mute/unmute by the hotkey.

[Where problems could occur]
Only affect specific laptops with the CS35L41 HDA and the speaker mute hotkey on keyboard. The impact is restricted.

Stefan Binding (5):
  ALSA: hda: cs35l41: Support systems with missing _DSD properties
  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

Takashi Iwai (1):
  ALSA: hda: cs35l41: Fix the loop check in cs35l41_add_dsd_properties

 sound/pci/hda/Makefile               |   2 +-
 sound/pci/hda/cs35l41_hda.c          | 197 ++++++++++++++++++---------
 sound/pci/hda/cs35l41_hda.h          |   4 +
 sound/pci/hda/cs35l41_hda_property.c |  73 ++++++++++
 sound/pci/hda/cs35l41_hda_property.h |  18 +++
 sound/pci/hda/hda_component.h        |   4 +
 sound/pci/hda/patch_realtek.c        |  83 ++++++++++-
 7 files changed, 316 insertions(+), 65 deletions(-)
 create mode 100644 sound/pci/hda/cs35l41_hda_property.c
 create mode 100644 sound/pci/hda/cs35l41_hda_property.h

-- 
2.34.1