platform/x86: dell-laptop: Add micmute LED trigger support

This patch adds the LED trigger support for audio mic-mute control.
As of this patch, the LED device isn't tied with the audio driver, and
can be changed via user-space at "platform::micmute" sysfs entry.
(This new prefix "platform" is the agreement among people for
indicating the generic laptop / system-wide attribute.)

The binding with HD-audio is still done via the existing exported
dell_micmute_led_set().  It will be replaced with the LED trigger
binding in later patches.

Also this selects CONFIG_LEDS_TRIGGERS and CONFIG_LEDS_TRIGGERS_AUDIO
unconditionally.  Strictly speaking, these aren't 100% mandatory, but
leaving these manual selections would lead to a functional regression
easily once after converting from the dynamic symbol binding to the
LEDs trigger in a later patch.

Acked-by: Jacek Anaszewski <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Acked-by: Pali Rohár <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>

0 files changed, 0 insertions, 0 deletions