[media] dt3155v4l: fix format handling

Fix various v4l2-compliance issues regarding format handling.

Main problem was a missing colorspace value and incorrect format
checks. This driver supports a single format only.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/staging/media/dt3155v4l/dt3155v4l.c

@@ -29,18 +29,6 @@
 
 #define DT3155_DEVICE_ID 0x1223
 
-static const struct v4l2_fmtdesc frame_std[] = {
-	{
-	.index = 0,
-	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
-	.flags = 0,
-	.description = "8-bit Greyscale",
-	.pixelformat = V4L2_PIX_FMT_GREY,
-	},
-};
-
-#define NUM_OF_FORMATS ARRAY_SIZE(frame_std)
-
 /**
  * read_i2c_reg - reads an internal i2c register
  *
@@ -330,49 +318,25 @@ static int dt3155_querycap(struct file *filp, void *p, struct v4l2_capability *c
 
 static int dt3155_enum_fmt_vid_cap(struct file *filp, void *p, struct v4l2_fmtdesc *f)
 {
-	if (f->index >= NUM_OF_FORMATS)
+	if (f->index)
 		return -EINVAL;
-	*f = frame_std[f->index];
+	f->pixelformat = V4L2_PIX_FMT_GREY;
+	strcpy(f->description, "8-bit Greyscale");
 	return 0;
 }
 
-static int dt3155_g_fmt_vid_cap(struct file *filp, void *p, struct v4l2_format *f)
+static int dt3155_fmt_vid_cap(struct file *filp, void *p, struct v4l2_format *f)
 {
 	struct dt3155_priv *pd = video_drvdata(filp);
 
-	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-		return -EINVAL;
 	f->fmt.pix.width = pd->width;
 	f->fmt.pix.height = pd->height;
 	f->fmt.pix.pixelformat = V4L2_PIX_FMT_GREY;
 	f->fmt.pix.field = V4L2_FIELD_NONE;
 	f->fmt.pix.bytesperline = f->fmt.pix.width;
 	f->fmt.pix.sizeimage = f->fmt.pix.width * f->fmt.pix.height;
-	f->fmt.pix.colorspace = 0;
-	f->fmt.pix.priv = 0;
-	return 0;
-}
-
-static int dt3155_try_fmt_vid_cap(struct file *filp, void *p, struct v4l2_format *f)
-{
-	struct dt3155_priv *pd = video_drvdata(filp);
-
-	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-		return -EINVAL;
-	if (f->fmt.pix.width == pd->width &&
-		f->fmt.pix.height == pd->height &&
-		f->fmt.pix.pixelformat == V4L2_PIX_FMT_GREY &&
-		f->fmt.pix.field == V4L2_FIELD_NONE &&
-		f->fmt.pix.bytesperline == f->fmt.pix.width &&
-		f->fmt.pix.sizeimage == f->fmt.pix.width * f->fmt.pix.height)
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 	return 0;
-	else
-		return -EINVAL;
-}
-
-static int dt3155_s_fmt_vid_cap(struct file *filp, void *p, struct v4l2_format *f)
-{
-	return dt3155_g_fmt_vid_cap(filp, p, f);
 }
 
 static int dt3155_g_std(struct file *filp, void *p, v4l2_std_id *norm)
@@ -431,9 +395,9 @@ static int dt3155_s_input(struct file *filp, void *p, unsigned int i)
 static const struct v4l2_ioctl_ops dt3155_ioctl_ops = {
 	.vidioc_querycap = dt3155_querycap,
 	.vidioc_enum_fmt_vid_cap = dt3155_enum_fmt_vid_cap,
-	.vidioc_try_fmt_vid_cap = dt3155_try_fmt_vid_cap,
-	.vidioc_g_fmt_vid_cap = dt3155_g_fmt_vid_cap,
-	.vidioc_s_fmt_vid_cap = dt3155_s_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap = dt3155_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap = dt3155_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap = dt3155_fmt_vid_cap,
 	.vidioc_reqbufs = vb2_ioctl_reqbufs,
 	.vidioc_create_bufs = vb2_ioctl_create_bufs,
 	.vidioc_querybuf = vb2_ioctl_querybuf,