Replace the control instance of the card
int snd_ctl_replace(struct snd_card * card, struct snd_kcontrol * kcontrol, bool add_on_replace);
card
the card instance
kcontrol
the control instance to replace
add_on_replace
add the control if not already added
Replaces the given control. If the given control does not exist and the add_on_replace flag is set, the control is added. If the control exists, it is destroyed first.
It frees automatically the control which cannot be added or replaced.
Zero if successful, or a negative error code on failure.