Add a new helper to add multiple vmaster followers in a shot. The same function was open-coded in various places, and this helper replaces them.
Signed-off-by: Takashi Iwai tiwai@suse.de --- include/sound/control.h | 3 +++ sound/core/vmaster.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+)
diff --git a/include/sound/control.h b/include/sound/control.h index 69d950a34ca3..9a4f4f7138da 100644 --- a/include/sound/control.h +++ b/include/sound/control.h @@ -262,6 +262,9 @@ snd_ctl_add_follower(struct snd_kcontrol *master, struct snd_kcontrol *follower) return _snd_ctl_add_follower(master, follower, 0); }
+int snd_ctl_add_followers(struct snd_card *card, struct snd_kcontrol *master, + const char * const *list); + /** * snd_ctl_add_follower_uncached - Add a virtual follower control * @master: vmaster element diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c index d0f11f37889b..378d2c7c3d4a 100644 --- a/sound/core/vmaster.c +++ b/sound/core/vmaster.c @@ -280,6 +280,34 @@ int _snd_ctl_add_follower(struct snd_kcontrol *master, } EXPORT_SYMBOL(_snd_ctl_add_follower);
+/** + * snd_ctl_add_followers - add multiple followers to vmaster + * @card: card instance + * @master: the target vmaster kcontrol object + * @list: NULL-terminated list of name strings of followers to be added + * + * Adds the multiple follower kcontrols with the given names. + * Returns 0 for success or a negative error code. + */ +int snd_ctl_add_followers(struct snd_card *card, struct snd_kcontrol *master, + const char * const *list) +{ + struct snd_kcontrol *follower; + int err; + + for (; *list; list++) { + follower = snd_ctl_find_id_mixer(card, *list); + if (follower) { + err = snd_ctl_add_follower(master, follower); + if (err < 0) + return err; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(snd_ctl_add_followers); + /* * ctl callbacks for master controls */