snd_ctl_activate_id(9) centos man page | unix.com

SND_CTL_ACTIVATE_ID(9)						 Control/Mixer API					    SND_CTL_ACTIVATE_ID(9)

NAME
       snd_ctl_activate_id - activate/inactivate the control of the given id

SYNOPSIS
       int snd_ctl_activate_id(struct snd_card * card, struct snd_ctl_elem_id * id, int active);

ARGUMENTS
       card
	   the card instance

       id
	   the control id to activate/inactivate

       active
	   non-zero to activate

DESCRIPTION
       Finds the control instance with the given id, and activate or inactivate the control together with notification, if changed.

RETURN
       0 if unchanged, 1 if changed, or a negative error code on failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    SND_CTL_ACTIVATE_ID(9)