ALSA: Add snd_ctl_activate_id()

Added a new API function snd_ctl_activate_id() for activate / inactivate
the control element dynamically.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 9ce00ed20fb..db51e4e6498 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -466,6 +466,52 @@ error:
 }
 
 /**
+ * snd_ctl_activate_id - activate/inactivate the control of the given id
+ * @card: the card instance
+ * @id: the control id to activate/inactivate
+ * @active: non-zero to activate
+ *
+ * Finds the control instance with the given id, and activate or
+ * inactivate the control together with notification, if changed.
+ *
+ * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
+ */
+int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
+                        int active)
+{
+        struct snd_kcontrol *kctl;
+        struct snd_kcontrol_volatile *vd;
+        unsigned int index_offset;
+        int ret;
+
+        down_write(&card->controls_rwsem);
+        kctl = snd_ctl_find_id(card, id);
+        if (kctl == NULL) {
+                ret = -ENOENT;
+                goto unlock;
+        }
+        index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
+        vd = &kctl->vd[index_offset];
+        ret = 0;
+        if (active) {
+                if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
+                        goto unlock;
+                vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+        } else {
+                if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
+                        goto unlock;
+                vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+        }
+        ret = 1;
+ unlock:
+        up_write(&card->controls_rwsem);
+        if (ret > 0)
+                snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
+
+/**
  * snd_ctl_rename_id - replace the id of a control on the card
  * @card: the card instance
  * @src_id: the old id