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ALSA: control: Introduce snd_ctl_find_id_mixer()

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A commonly seen pattern is to run snd_ctl_find_id() for a mixer
control element with a given string.  Let's provide a standard helper
for achieving that for simplifying the code.

Link: https://lore.kernel.org/r/20230720082108.31346-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2023-07-20 10:20:58 +02:00
parent f056f2fef3
commit 68fa05d4a8
1 changed files with 22 additions and 0 deletions
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include/sound/control.h
+22
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@@ -145,6 +145,28 @@ struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numi
struct snd_kcontrol *snd_ctl_find_id_locked(struct snd_card *card, const struct snd_ctl_elem_id *id);
struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, const struct snd_ctl_elem_id *id);
/**
* snd_ctl_find_id_mixer - find the control instance with the given name string
* @card: the card instance
* @name: the name string
*
* Finds the control instance with the given name and
* @SNDRV_CTL_ELEM_IFACE_MIXER. Other fields are set to zero.
*
* This is merely a wrapper to snd_ctl_find_id().
*
* Return: The pointer of the instance if found, or %NULL if not.
*/
static inline struct snd_kcontrol *
snd_ctl_find_id_mixer(struct snd_card *card, const char *name)
{
struct snd_ctl_elem_id id = {};
id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
strscpy(id.name, name, sizeof(id.name));
return snd_ctl_find_id(card, &id);
}
int snd_ctl_create(struct snd_card *card);
int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);