Merge branch 'kprobes' of git://git.linaro.org/people/nico/linux into fixes

[karo-tx-linux.git] / sound / core / control.c

diff --git a/sound/core/control.c b/sound/core/control.c
index dc4afa6f99b15f64ef5c3bb3250f5eeaa7297e37..a08ad57c49b6adf48a6fcc516dd02d62c159f406 100644 (file)
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -463,6 +463,52 @@ error:
        return ret;
 }
 
+/**
+ * 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