in cec.c [415:429]
static int decay_interval_set(void *data, u64 val)
{
if (val < CEC_DECAY_MIN_INTERVAL)
return -EINVAL;
if (val > CEC_DECAY_MAX_INTERVAL)
return -EINVAL;
*(u64 *)data = val;
decay_interval = val;
cec_mod_work(decay_interval);
return 0;
}