ALSA: hda: cs35l41: Support mute notifications for CS35L41 HDA

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Some laptops require a hardware based mute system, where when a hotkey
is pressed, it forces the amp to be muted.

For CS35L41, when the hotkey is pressed, an acpi notification is sent
to the CS35L41 Device Node. The driver needs to handle this notification
and call a _DSM function to retrieve the mute state.

Since the amp is only muted during playback, the driver will only mute
or unmute if playback is occurring, otherwise it will save the mute
state for when playback starts.

This uses the ACPI Notification mechanism, where a handler has been
registered in the component master, which notifies each amp through
the component binding.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230921162849.1988124-4-sbinding@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Stefan Binding 2023-09-21 17:28:48 +01:00 • committed by Takashi Iwai

parent 7ce669334c

commit 447106e92a

2 changed files with 94 additions and 13 deletions

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104

sound/pci/hda/cs35l41_hda.c

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3

sound/pci/hda/cs35l41_hda.h

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