V4L/DVB (12218): radio-si470x: conform to the RDS spec.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/radio-si470x.c

@@ -1254,7 +1254,7 @@ static int si470x_vidioc_querycap(struct file *file, void *priv,
 	usb_make_path(radio->usbdev, capability->bus_info, sizeof(capability->bus_info));
 	capability->version = DRIVER_KERNEL_VERSION;
 	capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
-		V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+		V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 
 	return 0;
 }
@@ -1413,7 +1413,8 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
 	/* driver constants */
 	strcpy(tuner->name, "FM");
 	tuner->type = V4L2_TUNER_RADIO;
-	tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
+	tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+			    V4L2_TUNER_CAP_RDS;
 
 	/* range limits */
 	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
@@ -1439,6 +1440,10 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
 		tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
 	else
 		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+	/* If there is a reliable method of detecting an RDS channel,
+	   then this code should check for that before setting this
+	   RDS subchannel. */
+	tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
 
 	/* mono/stereo selector */
 	if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)