Activate/inactivate the control of the given id
int snd_ctl_activate_id(struct snd_card * card, struct snd_ctl_elem_id * id, int active);
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.
0 if unchanged, 1 if changed, or a negative error code on failure.