path: root/drivers/leds
diff options
authorTakashi Iwai <tiwai@suse.de>2018-11-26 17:47:44 +0100
committerTakashi Iwai <tiwai@suse.de>2018-11-28 12:28:30 +0100
commitfaa2541f5b1afa8b6d777a73bc2f27d5c8c98695 (patch)
tree554ede6ec6bc2e5cba43240b633ff0c726f6a270 /drivers/leds
parent9ff01193a20d391e8dbce4403dd5ef87c7eaaca6 (diff)
leds: trigger: Introduce audio mute LED trigger
This patch adds a new LED trigger for coupling the audio mixer change with the LED on laptops or other devices. Currently there are two trigger types, "audio-mute" and "audio-micmute". The audio driver triggers the LED brightness change via ledtrig_audio_set() call with the proper type (either mute or mic-mute). OTOH, the consumers may call ledtrig_audio_get() for the initial brightness value that may have been set by the audio driver beforehand. This new stuff will be used by HD-audio codec driver and some platform drivers (thinkpad_acpi and dell-laptop, also upcoming huawei-wmi). Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Acked-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'drivers/leds')
3 files changed, 52 insertions, 0 deletions
diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
index b76fc3cdc8f8..23cc85e2e0e5 100644
--- a/drivers/leds/trigger/Kconfig
+++ b/drivers/leds/trigger/Kconfig
@@ -136,4 +136,11 @@ config LEDS_TRIGGER_PATTERN
which is a series of tuples, of brightness and duration (ms).
If unsure, say N
+ tristate "Audio Mute LED Trigger"
+ help
+ This allows LEDs to be controlled by audio drivers for following
+ the audio mute and mic-mute changes.
+ If unsure, say N
diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile
index 9bcb64ee8123..733a83e2a718 100644
--- a/drivers/leds/trigger/Makefile
+++ b/drivers/leds/trigger/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o
obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o
obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
obj-$(CONFIG_LEDS_TRIGGER_PATTERN) += ledtrig-pattern.o
+obj-$(CONFIG_LEDS_TRIGGER_AUDIO) += ledtrig-audio.o
diff --git a/drivers/leds/trigger/ledtrig-audio.c b/drivers/leds/trigger/ledtrig-audio.c
new file mode 100644
index 000000000000..f76621e88482
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-audio.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+// Audio Mute LED trigger
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+static struct led_trigger *ledtrig_audio[NUM_AUDIO_LEDS];
+static enum led_brightness audio_state[NUM_AUDIO_LEDS];
+enum led_brightness ledtrig_audio_get(enum led_audio type)
+ return audio_state[type];
+void ledtrig_audio_set(enum led_audio type, enum led_brightness state)
+ audio_state[type] = state;
+ led_trigger_event(ledtrig_audio[type], state);
+static int __init ledtrig_audio_init(void)
+ led_trigger_register_simple("audio-mute",
+ &ledtrig_audio[LED_AUDIO_MUTE]);
+ led_trigger_register_simple("audio-micmute",
+ &ledtrig_audio[LED_AUDIO_MICMUTE]);
+ return 0;
+static void __exit ledtrig_audio_exit(void)
+ led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MUTE]);
+ led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MICMUTE]);
+MODULE_DESCRIPTION("LED trigger for audio mute control");

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