media: core: export v4l2_translate_cmd

video_translate_cmd() can be useful for drivers to convert between the
VIDIOC_*32 and VIDIOC_ defines. Let's export it.

Now that the function is exported, use this opportunity to rename the
function with the v4l2_ prefix, that is less ambiguous than video_

The VIDIOC_*32 defines are not accessible by the drivers, they live in
v4l2-compat-ioctl32.c.

Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250701-uvc-grannular-invert-v4-6-8003b9b89f68@chromium.org
Signed-off-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

Author: ribalda

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -3249,7 +3249,7 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
 	return ret;
 }
 
-static unsigned int video_translate_cmd(unsigned int cmd)
+unsigned int v4l2_translate_cmd(unsigned int cmd)
 {
 #if !defined(CONFIG_64BIT) && defined(CONFIG_COMPAT_32BIT_TIME)
 	switch (cmd) {
@@ -3270,6 +3270,7 @@ static unsigned int video_translate_cmd(unsigned int cmd)
 
 	return cmd;
 }
+EXPORT_SYMBOL_GPL(v4l2_translate_cmd);
 
 static int video_get_user(void __user *arg, void *parg,
 			  unsigned int real_cmd, unsigned int cmd,
@@ -3430,7 +3431,7 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg,
 	size_t  array_size = 0;
 	void __user *user_ptr = NULL;
 	void	**kernel_ptr = NULL;
-	unsigned int cmd = video_translate_cmd(orig_cmd);
+	unsigned int cmd = v4l2_translate_cmd(orig_cmd);
 	const size_t ioc_size = _IOC_SIZE(cmd);
 
 	/*  Copy arguments into temp kernel buffer  */

include/media/v4l2-ioctl.h

@@ -679,6 +679,7 @@ long int v4l2_compat_ioctl32(struct file *file, unsigned int cmd,
 #endif
 
 unsigned int v4l2_compat_translate_cmd(unsigned int cmd);
+unsigned int v4l2_translate_cmd(unsigned int cmd);
 int v4l2_compat_get_user(void __user *arg, void *parg, unsigned int cmd);
 int v4l2_compat_put_user(void __user *arg, void *parg, unsigned int cmd);
 int v4l2_compat_get_array_args(struct file *file, void *mbuf,