[media] v4l2: make vidioc_s_modulator const

Write-only ioctls should have a const argument in the ioctl op.
Do this conversion for vidioc_s_modulator.
Adding const for write-only ioctls was decided during the 2012 Media Workshop.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/radio-keene.c

@@ -203,7 +203,7 @@ static int vidioc_g_modulator(struct file *file, void *priv,
 }
 
 static int vidioc_s_modulator(struct file *file, void *priv,
-				struct v4l2_modulator *v)
+				const struct v4l2_modulator *v)
 {
 	struct keene_device *radio = video_drvdata(file);
 

drivers/media/radio/radio-si4713.c

@@ -200,7 +200,7 @@ static int radio_si4713_g_modulator(struct file *file, void *p,
 }
 
 static int radio_si4713_s_modulator(struct file *file, void *p,
-						struct v4l2_modulator *vm)
+						const struct v4l2_modulator *vm)
 {
 	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
 							s_modulator, vm);

drivers/media/radio/radio-wl1273.c

@@ -1715,7 +1715,7 @@ out:
 }
 
 static int wl1273_fm_vidioc_s_modulator(struct file *file, void *priv,
-					struct v4l2_modulator *modulator)
+					const struct v4l2_modulator *modulator)
 {
 	struct wl1273_device *radio = video_get_drvdata(video_devdata(file));
 	struct wl1273_core *core = radio->core;

drivers/media/radio/si4713-i2c.c

@@ -1213,7 +1213,7 @@ exit:
 }
 
 static int si4713_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f);
-static int si4713_s_modulator(struct v4l2_subdev *sd, struct v4l2_modulator *);
+static int si4713_s_modulator(struct v4l2_subdev *sd, const struct v4l2_modulator *);
 /*
  * si4713_setup - Sets the device up with current configuration.
  * @sdev: si4713_device structure for the device we are communicating
@@ -1873,7 +1873,7 @@ exit:
 }
 
 /* si4713_s_modulator - set modulator attributes */
-static int si4713_s_modulator(struct v4l2_subdev *sd, struct v4l2_modulator *vm)
+static int si4713_s_modulator(struct v4l2_subdev *sd, const struct v4l2_modulator *vm)
 {
 	struct si4713_device *sdev = to_si4713_device(sd);
 	int rval = 0;

drivers/media/radio/wl128x/fmdrv_v4l2.c

@@ -448,7 +448,7 @@ static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
 
 /* Set modulator attributes. If mode is not TX, set to TX. */
 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
-		struct v4l2_modulator *mod)
+		const struct v4l2_modulator *mod)
 {
 	struct fmdev *fmdev = video_drvdata(file);
 	u8 rds_mode;

include/media/v4l2-ioctl.h

@@ -179,7 +179,7 @@ struct v4l2_ioctl_ops {
 	int (*vidioc_g_modulator)      (struct file *file, void *fh,
 					struct v4l2_modulator *a);
 	int (*vidioc_s_modulator)      (struct file *file, void *fh,
-					struct v4l2_modulator *a);
+					const struct v4l2_modulator *a);
 	/* Crop ioctls */
 	int (*vidioc_cropcap)          (struct file *file, void *fh,
 					struct v4l2_cropcap *a);

include/media/v4l2-subdev.h

@@ -194,7 +194,7 @@ struct v4l2_subdev_tuner_ops {
 	int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 	int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 	int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
-	int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
+	int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
 	int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
 	int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
 };