V4L/DVB: v4l2-common: add ability to use v4l2_ctrl_query_fill for chroma gain

Add the ability to use the v4l2_ctrl_query_fill() function for the newly
introduced chroma gain control.

Also, make use of the centralized function by the one caller.

This work was sponsored by EyeMagnet Limited.
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/saa7115.c

@@ -1234,16 +1234,7 @@ static int saa711x_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 	case V4L2_CID_CHROMA_AGC:
 		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 	case V4L2_CID_CHROMA_GAIN:
-		qc->type = V4L2_CTRL_TYPE_INTEGER;
-		qc->flags = V4L2_CTRL_FLAG_SLIDER;
-		qc->minimum = 0;
-		qc->maximum = 127;
-		qc->step = 1;
-		qc->default_value = 0x30;
-		qc->reserved[0] = 0;
-		qc->reserved[1] = 0;
-		strlcpy(qc->name, "chroma_gain", sizeof(qc->name));
-		return 0;
+		return v4l2_ctrl_query_fill(qc, 0, 127, 1, 48);
 	default:
 		return -EINVAL;
 	}

drivers/media/video/v4l2-common.c

@@ -429,6 +429,7 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_SHARPNESS:		return "Sharpness";
 	case V4L2_CID_BACKLIGHT_COMPENSATION:	return "Backlight Compensation";
 	case V4L2_CID_CHROMA_AGC:		return "Chroma AGC";
+	case V4L2_CID_CHROMA_GAIN:		return "Chroma Gain";
 	case V4L2_CID_COLOR_KILLER:		return "Color Killer";
 	case V4L2_CID_COLORFX:			return "Color Effects";
 	case V4L2_CID_AUTOBRIGHTNESS:		return "Brightness, Automatic";
@@ -622,6 +623,7 @@ int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 ste
 	case V4L2_CID_BLUE_BALANCE:
 	case V4L2_CID_GAMMA:
 	case V4L2_CID_SHARPNESS:
+	case V4L2_CID_CHROMA_GAIN:
 	case V4L2_CID_RDS_TX_DEVIATION:
 	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
 	case V4L2_CID_AUDIO_LIMITER_DEVIATION: