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ALSA: hda/realtek - Add LED class support for micmute LED 

Currently DMIC controls micmute LED via "audio mute LED trigger".

However, unlike Dell and Lenovo platforms, HP platforms don't provide a
way to control micmute LED via ACPI, it's controlled by HDA codec
instead.

So let's register an LED class for micmute so other subsystems like DMIC
can facilitate the codec-controlled LED.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20200430135209.14703-1-kai.heng.feng@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kai-Heng Feng 2020-04-30 21:52:07 +08:00 committed by Takashi Iwai
parent 3e0650ab26
commit 87dc36482c
1 changed files with 29 additions and 0 deletions
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29
sound/pci/hda/patch_realtek.c
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@ -17,6 +17,7 @@
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/hda_codec.h>
@ -4103,6 +4104,26 @@ static void alc_gpio_micmute_update(struct hda_codec *codec)
spec->gen.micmute_led.led_value);
}
#if IS_REACHABLE(CONFIG_LEDS_TRIGGER_AUDIO)
static int micmute_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct hda_codec *codec = dev_to_hda_codec(led_cdev->dev->parent);
struct alc_spec *spec = codec->spec;
alc_update_gpio_led(codec, spec->gpio_mic_led_mask,
spec->micmute_led_polarity, !!brightness);
return 0;
}
static struct led_classdev micmute_led_cdev = {
.name = "hda::micmute",
.max_brightness = 1,
.brightness_set_blocking = micmute_led_set,
.default_trigger = "audio-micmute",
};
#endif
/* setup mute and mic-mute GPIO bits, add hooks appropriately */
static void alc_fixup_hp_gpio_led(struct hda_codec *codec,
int action,
@ -4110,6 +4131,7 @@ static void alc_fixup_hp_gpio_led(struct hda_codec *codec,
unsigned int micmute_mask)
{
struct alc_spec *spec = codec->spec;
int err;
alc_fixup_gpio(codec, action, mute_mask | micmute_mask);
@ -4122,6 +4144,13 @@ static void alc_fixup_hp_gpio_led(struct hda_codec *codec,
if (micmute_mask) {
spec->gpio_mic_led_mask = micmute_mask;
snd_hda_gen_add_micmute_led(codec, alc_gpio_micmute_update);
#if IS_REACHABLE(CONFIG_LEDS_TRIGGER_AUDIO)
micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
err = devm_led_classdev_register(&codec->core.dev, &micmute_led_cdev);
if (err)
codec_warn(codec, "failed to register micmute LED\n");
#endif
}
}