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| author |   Jaroslav Kysela <perex@perex.cz> | 2021-03-17 18:29:41 +0100 |
|---|---|---|
| committer |   Takashi Iwai <tiwai@suse.de> | 2021-03-30 15:33:13 +0200 |
| commit | 3f0638a0333bfdd0549985aa620f2ab69737af47 (patch) | |
| tree | 341e966ae98e6527634920e0a5cb4ef1ca8e0ffc /include/sound | |
| parent | ALSA: control - introduce snd_ctl_notify_one() helper (diff) | |
| download | linux-dev-3f0638a0333bfdd0549985aa620f2ab69737af47.tar.xz linux-dev-3f0638a0333bfdd0549985aa620f2ab69737af47.zip | |
ALSA: control - add layer registration routines
The layer registration allows to handle an extra functionality
on top of the control API. It can be used for the audio
LED control for example.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210317172945.842280-3-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/control.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/sound/control.h b/include/sound/control.h index 22f3d48163ff..175610bfa8c8 100644 --- a/include/sound/control.h +++ b/include/sound/control.h @@ -108,6 +108,14 @@ struct snd_ctl_file { struct list_head events; /* waiting events for read */ }; +struct snd_ctl_layer_ops { + struct snd_ctl_layer_ops *next; + const char *module_name; + void (*lregister)(struct snd_card *card); + void (*ldisconnect)(struct snd_card *card); + void (*lnotify)(struct snd_card *card, unsigned int mask, struct snd_kcontrol *kctl, unsigned int ioff); +}; + #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list) typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card, @@ -140,6 +148,10 @@ int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn); #define snd_ctl_unregister_ioctl_compat(fcn) #endif +int snd_ctl_request_layer(const char *module_name); +void snd_ctl_register_layer(struct snd_ctl_layer_ops *lops); +void snd_ctl_disconnect_layer(struct snd_ctl_layer_ops *lops); + int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type); static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |