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| author | Jaroslav Kysela <perex@perex.cz> | 2021-03-17 18:29:42 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-03-30 15:33:58 +0200 |
| commit | 22d8de62f11b287b279f1d4473a78c7d5e53e7bc (patch) | |
| tree | c70cf12a37bf874e36b727dbefece077b34febe5 /include/sound/control.h | |
| parent | ALSA: control - add layer registration routines (diff) | |
| download | linux-22d8de62f11b287b279f1d4473a78c7d5e53e7bc.tar.xz linux-22d8de62f11b287b279f1d4473a78c7d5e53e7bc.zip | |
ALSA: control - add generic LED trigger module as the new control layer
The recent laptops have usually two LEDs assigned to reflect
the speaker and microphone mute state. This implementation
adds a tiny layer on top of the control API which calculates
the state for those LEDs using the driver callbacks.
Two new access flags are introduced to describe the controls
which affects the audio path settings (an easy code change
for drivers).
The LED resource can be shared with multiple sound cards with
this code. The user space controls may be added to the state
chain on demand, too.
This code should replace the LED code in the HDA driver and
add a possibility to easy extend the other drivers (ASoC
codecs etc.).
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210317172945.842280-4-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/control.h')
| -rw-r--r-- | include/sound/control.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/include/sound/control.h b/include/sound/control.h index 175610bfa8c8..985c51a8fb74 100644 --- a/include/sound/control.h +++ b/include/sound/control.h @@ -24,7 +24,7 @@ typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol, /* internal flag for skipping validations */ #ifdef CONFIG_SND_CTL_VALIDATION -#define SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK (1 << 27) +#define SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK (1 << 24) #define snd_ctl_skip_validation(info) \ ((info)->access & SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK) #else @@ -32,6 +32,12 @@ typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol, #define snd_ctl_skip_validation(info) true #endif +/* kernel only - LED bits */ +#define SNDRV_CTL_ELEM_ACCESS_LED_SHIFT 25 +#define SNDRV_CTL_ELEM_ACCESS_LED_MASK (7<<25) /* kernel three bits - LED group */ +#define SNDRV_CTL_ELEM_ACCESS_SPK_LED (1<<25) /* kernel speaker (output) LED flag */ +#define SNDRV_CTL_ELEM_ACCESS_MIC_LED (2<<25) /* kernel microphone (input) LED flag */ + enum { SNDRV_CTL_TLV_OP_READ = 0, SNDRV_CTL_TLV_OP_WRITE = 1, @@ -266,6 +272,17 @@ int snd_ctl_apply_vmaster_followers(struct snd_kcontrol *kctl, void *arg); /* + * Control LED trigger layer + */ +#define SND_CTL_LAYER_MODULE_LED "snd-ctl-led" + +#if IS_MODULE(CONFIG_SND_CTL_LED) +static inline int snd_ctl_led_request(void) { return snd_ctl_request_layer(SND_CTL_LAYER_MODULE_LED); } +#else +static inline int snd_ctl_led_request(void) { return 0; } +#endif + +/* * Helper functions for jack-detection controls */ struct snd_kcontrol * |