media: radio: Critical v4l2 registration bugfix for si470x over i2c

Added the call to v4l2_device_register() required to add a new radio device.
Without this patch, it is impossible for the driver to load. This does not
affect USB devices.
Signed-off-by: Douglas Fischer <fischerdouglasc@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/radio/si470x/radio-si470x-i2c.c

@@ -43,7 +43,6 @@ static const struct i2c_device_id si470x_i2c_id[] = {
 MODULE_DEVICE_TABLE(i2c, si470x_i2c_id);
 
 
-
 /**************************************************************************
  * Module Parameters
  **************************************************************************/
@@ -362,22 +361,43 @@ static int si470x_i2c_probe(struct i2c_client *client,
 	mutex_init(&radio->lock);
 	init_completion(&radio->completion);
 
+	retval = v4l2_device_register(&client->dev, &radio->v4l2_dev);
+	if (retval < 0) {
+		dev_err(&client->dev, "couldn't register v4l2_device\n");
+		goto err_radio;
+	}
+
+	v4l2_ctrl_handler_init(&radio->hdl, 2);
+	v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
+			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
+	v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
+			V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
+	if (radio->hdl.error) {
+		retval = radio->hdl.error;
+		dev_err(&client->dev, "couldn't register control\n");
+		goto err_dev;
+	}
+
 	/* video device initialization */
 	radio->videodev = si470x_viddev_template;
+	radio->videodev.ctrl_handler = &radio->hdl;
+	radio->videodev.lock = &radio->lock;
+	radio->videodev.v4l2_dev = &radio->v4l2_dev;
+	radio->videodev.release = video_device_release_empty;
 	video_set_drvdata(&radio->videodev, radio);
 
 	/* power up : need 110ms */
 	radio->registers[POWERCFG] = POWERCFG_ENABLE;
 	if (si470x_set_register(radio, POWERCFG) < 0) {
 		retval = -EIO;
-		goto err_radio;
+		goto err_ctrl;
 	}
 	msleep(110);
 
 	/* get device and chip versions */
 	if (si470x_get_all_registers(radio) < 0) {
 		retval = -EIO;
-		goto err_radio;
+		goto err_ctrl;
 	}
 	dev_info(&client->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 			radio->registers[DEVICEID], radio->registers[SI_CHIPID]);
@@ -407,7 +427,7 @@ static int si470x_i2c_probe(struct i2c_client *client,
 	radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 	if (!radio->buffer) {
 		retval = -EIO;
-		goto err_radio;
+		goto err_ctrl;
 	}
 
 	/* rds buffer configuration */
@@ -437,6 +457,10 @@ static int si470x_i2c_probe(struct i2c_client *client,
 	free_irq(client->irq, radio);
 err_rds:
 	kfree(radio->buffer);
+err_ctrl:
+	v4l2_ctrl_handler_free(&radio->hdl);
+err_dev:
+	v4l2_device_unregister(&radio->v4l2_dev);
 err_radio:
 	kfree(radio);
 err_initial: