snd_ctl_add_slave_uncached — Add a virtual slave control
int snd_ctl_add_slave_uncached ( | struct snd_kcontrol * master, |
struct snd_kcontrol * slave); |
Add a virtual slave control to the given master.
Unlike snd_ctl_add_slave, the element added via this function
is supposed to have volatile values, and get callback is called
at each time queried from the master.
When the control peeks the hardware values directly and the value can be changed by other means than the put callback of the element, this function should be used to keep the value always up-to-date.