V4L2_CTRL_ID_MASK
v4l2_id &= V4L2_CTRL_ID_MASK;
req_id &= V4L2_CTRL_ID_MASK;
if (mapping->id & ~V4L2_CTRL_ID_MASK) {
u32 id = qc->id & V4L2_CTRL_ID_MASK;
u32 id = c->id & V4L2_CTRL_ID_MASK;
id &= V4L2_CTRL_ID_MASK;