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authorTakashi Iwai <tiwai@suse.de>2023-07-21 10:16:40 +0300
committerTakashi Iwai <tiwai@suse.de>2023-07-21 10:37:47 +0300
commitae07eb9bf23e1a52cdb28222a71eb014131018d8 (patch)
tree3f36aecc5b779a1a9c2bbd3c669f3b714a7d19da /sound/core
parentebc1bfebdacab9e7fd77eec2c5dbcef73980ab00 (diff)
downloadlinux-ae07eb9bf23e1a52cdb28222a71eb014131018d8.tar.xz
ALSA: vmaster: Add snd_ctl_add_followers() helper
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. Link: https://lore.kernel.org/r/20230721071643.3631-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/vmaster.c28
1 files changed, 28 insertions, 0 deletions
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
*/