V4L/DVB (12104): ivtv/cx18: fix regression: class controls are no longer seen

A previous change (v4l2-common: remove v4l2_ctrl_query_fill_std) broke
the handling of class controls in VIDIOC_QUERYCTRL. The MPEG class control
was broken for all drivers that use the cx2341x module and the USER class
control was broken for ivtv and cx18.

This change adds back proper class control support.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-controls.c

@@ -61,6 +61,8 @@ int cx18_queryctrl(struct file *file, void *fh, struct v4l2_queryctrl *qctrl)
 
 	switch (qctrl->id) {
 	/* Standard V4L2 controls */
+	case V4L2_CID_USER_CLASS:
+		return v4l2_ctrl_query_fill(qctrl, 0, 0, 0, 0);
 	case V4L2_CID_BRIGHTNESS:
 	case V4L2_CID_HUE:
 	case V4L2_CID_SATURATION:

drivers/media/video/cx2341x.c

@@ -500,6 +500,8 @@ int cx2341x_ctrl_query(const struct cx2341x_mpeg_params *params,
 	int err;
 
 	switch (qctrl->id) {
+	case V4L2_CID_MPEG_CLASS:
+		return v4l2_ctrl_query_fill(qctrl, 0, 0, 0, 0);
 	case V4L2_CID_MPEG_STREAM_TYPE:
 		return v4l2_ctrl_query_fill(qctrl,
 				V4L2_MPEG_STREAM_TYPE_MPEG2_PS,

drivers/media/video/ivtv/ivtv-controls.c

@@ -60,6 +60,8 @@ int ivtv_queryctrl(struct file *file, void *fh, struct v4l2_queryctrl *qctrl)
 
 	switch (qctrl->id) {
 	/* Standard V4L2 controls */
+	case V4L2_CID_USER_CLASS:
+		return v4l2_ctrl_query_fill(qctrl, 0, 0, 0, 0);
 	case V4L2_CID_BRIGHTNESS:
 	case V4L2_CID_HUE:
 	case V4L2_CID_SATURATION: