[media] v4l2: make vidioc_s_freq_hw_seek const

Write-only ioctls should have a const argument in the ioctl op.
Do this conversion for vidioc_s_freq_hw_seek.
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-mr800.c

@@ -348,7 +348,7 @@ static int vidioc_g_frequency(struct file *file, void *priv,
 }
 
 static int vidioc_s_hw_freq_seek(struct file *file, void *priv,
-		struct v4l2_hw_freq_seek *seek)
+		const struct v4l2_hw_freq_seek *seek)
 {
 	static u8 buf[8] = {
 		0x3d, 0x32, 0x0f, 0x08, 0x3d, 0x32, 0x0f, 0x08

drivers/media/radio/radio-tea5777.c

@@ -385,59 +385,61 @@ static int vidioc_s_frequency(struct file *file, void *priv,
 }
 
 static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
-					struct v4l2_hw_freq_seek *a)
+					const struct v4l2_hw_freq_seek *a)
 {
 	struct radio_tea5777 *tea = video_drvdata(file);
 	unsigned long timeout;
+	u32 rangelow = a->rangelow;
+	u32 rangehigh = a->rangehigh;
 	int i, res, spacing;
 	u32 orig_freq;
 
 	if (a->tuner || a->wrap_around)
 		return -EINVAL;
 
-	if (a->rangelow || a->rangehigh) {
+	if (rangelow || rangehigh) {
 		for (i = 0; i < ARRAY_SIZE(bands); i++) {
 			if (i == BAND_AM && !tea->has_am)
 				continue;
-			if (bands[i].rangelow  >= a->rangelow &&
-			    bands[i].rangehigh <= a->rangehigh)
+			if (bands[i].rangelow  >= rangelow &&
+			    bands[i].rangehigh <= rangehigh)
 				break;
 		}
 		if (i == ARRAY_SIZE(bands))
 			return -EINVAL; /* No matching band found */
 
 		tea->band = i;
-		if (tea->freq < a->rangelow || tea->freq > a->rangehigh) {
-			tea->freq = clamp(tea->freq, a->rangelow,
-						     a->rangehigh);
+		if (tea->freq < rangelow || tea->freq > rangehigh) {
+			tea->freq = clamp(tea->freq, rangelow,
+						     rangehigh);
 			res = radio_tea5777_set_freq(tea);
 			if (res)
 				return res;
 		}
 	} else {
-		a->rangelow  = bands[tea->band].rangelow;
-		a->rangehigh = bands[tea->band].rangehigh;
+		rangelow  = bands[tea->band].rangelow;
+		rangehigh = bands[tea->band].rangehigh;
 	}
 
 	spacing   = (tea->band == BAND_AM) ? (5 * 16) : (200 * 16); /* kHz */
 	orig_freq = tea->freq;
 
 	tea->write_reg |= TEA5777_W_PROGBLIM_MASK;
-	if (tea->seek_rangelow != a->rangelow) {
+	if (tea->seek_rangelow != rangelow) {
 		tea->write_reg &= ~TEA5777_W_UPDWN_MASK;
-		tea->freq = a->rangelow;
+		tea->freq = rangelow;
 		res = radio_tea5777_set_freq(tea);
 		if (res)
 			goto leave;
-		tea->seek_rangelow = a->rangelow;
+		tea->seek_rangelow = rangelow;
 	}
-	if (tea->seek_rangehigh != a->rangehigh) {
+	if (tea->seek_rangehigh != rangehigh) {
 		tea->write_reg |= TEA5777_W_UPDWN_MASK;
-		tea->freq = a->rangehigh;
+		tea->freq = rangehigh;
 		res = radio_tea5777_set_freq(tea);
 		if (res)
 			goto leave;
-		tea->seek_rangehigh = a->rangehigh;
+		tea->seek_rangehigh = rangehigh;
 	}
 	tea->write_reg &= ~TEA5777_W_PROGBLIM_MASK;
 

drivers/media/radio/radio-wl1273.c

@@ -1682,7 +1682,7 @@ static int wl1273_fm_vidioc_s_frequency(struct file *file, void *priv,
 #define WL1273_DEFAULT_SEEK_LEVEL	7
 
 static int wl1273_fm_vidioc_s_hw_freq_seek(struct file *file, void *priv,
-					   struct v4l2_hw_freq_seek *seek)
+					   const struct v4l2_hw_freq_seek *seek)
 {
 	struct wl1273_device *radio = video_get_drvdata(video_devdata(file));
 	struct wl1273_core *core = radio->core;

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

@@ -296,7 +296,7 @@ int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
  * si470x_set_seek - set seek
  */
 static int si470x_set_seek(struct si470x_device *radio,
-			   struct v4l2_hw_freq_seek *seek)
+			   const struct v4l2_hw_freq_seek *seek)
 {
 	int band, retval;
 	unsigned int freq;
@@ -701,7 +701,7 @@ static int si470x_vidioc_s_frequency(struct file *file, void *priv,
  * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
  */
 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
-		struct v4l2_hw_freq_seek *seek)
+		const struct v4l2_hw_freq_seek *seek)
 {
 	struct si470x_device *radio = video_drvdata(file);
 

drivers/media/radio/wl128x/fmdrv_v4l2.c

@@ -403,7 +403,7 @@ static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
 
 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
-		struct v4l2_hw_freq_seek *seek)
+		const struct v4l2_hw_freq_seek *seek)
 {
 	struct fmdev *fmdev = video_drvdata(file);
 	int ret;

include/media/v4l2-ioctl.h

@@ -233,7 +233,7 @@ struct v4l2_ioctl_ops {
 	int (*vidioc_log_status)       (struct file *file, void *fh);
 
 	int (*vidioc_s_hw_freq_seek)   (struct file *file, void *fh,
-					struct v4l2_hw_freq_seek *a);
+					const struct v4l2_hw_freq_seek *a);
 
 	/* Debugging ioctls */
 #ifdef CONFIG_VIDEO_ADV_DEBUG

sound/i2c/other/tea575x-tuner.c

@@ -357,7 +357,7 @@ static int vidioc_s_frequency(struct file *file, void *priv,
 }
 
 static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
-					struct v4l2_hw_freq_seek *a)
+					const struct v4l2_hw_freq_seek *a)
 {
 	struct snd_tea575x *tea = video_drvdata(file);
 	unsigned long timeout;