/*
   * ioctl32.c: Conversion between 32bit and 64bit native ioctls.
   *	Separated from fs stuff by Arnd Bergmann <arnd@arndb.de>
   *
   * Copyright (C) 1997-2000  Jakub Jelinek  (jakub@redhat.com)
   * Copyright (C) 1998  Eddie C. Dost  (ecd@skynet.be)
   * Copyright (C) 2001,2002  Andi Kleen, SuSE Labs

   * Copyright (C) 2003       Pavel Machek (pavel@ucw.cz)

   * Copyright (C) 2005       Philippe De Muyter (phdm@macqel.be)

   * Copyright (C) 2008       Hans Verkuil <hverkuil@xs4all.nl>

   *
   * These routines maintain argument size conversion between 32bit and 64bit
   * ioctls.
   */

  #include <linux/compat.h>

  #include <linux/module.h>

  #include <linux/videodev2.h>

  #include <linux/v4l2-subdev.h>

  #include <media/v4l2-dev.h>

  #include <media/v4l2-ioctl.h>

  static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

  {

  	long ret = -ENOIOCTLCMD;

  
  	if (file->f_op->unlocked_ioctl)
  		ret = file->f_op->unlocked_ioctl(file, cmd, arg);

  
  	return ret;
  }

  struct v4l2_clip32 {

  	struct v4l2_rect        c;
  	compat_caddr_t 		next;
  };

  struct v4l2_window32 {

  	struct v4l2_rect        w;

  	__u32		  	field;	/* enum v4l2_field */

  	__u32			chromakey;
  	compat_caddr_t		clips; /* actually struct v4l2_clip32 * */
  	__u32			clipcount;
  	compat_caddr_t		bitmap;
  };
  
  static int get_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
  {

  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_window32)) ||
  		copy_from_user(&kp->w, &up->w, sizeof(up->w)) ||
  		get_user(kp->field, &up->field) ||
  		get_user(kp->chromakey, &up->chromakey) ||
  		get_user(kp->clipcount, &up->clipcount))
  			return -EFAULT;

  	if (kp->clipcount > 2048)
  		return -EINVAL;
  	if (kp->clipcount) {

  		struct v4l2_clip32 __user *uclips;
  		struct v4l2_clip __user *kclips;

  		int n = kp->clipcount;

  		compat_caddr_t p;

  		if (get_user(p, &up->clips))
  			return -EFAULT;
  		uclips = compat_ptr(p);

  		kclips = compat_alloc_user_space(n * sizeof(struct v4l2_clip));
  		kp->clips = kclips;
  		while (--n >= 0) {

  			if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c)))
  				return -EFAULT;
  			if (put_user(n ? kclips + 1 : NULL, &kclips->next))

  				return -EFAULT;

  			uclips += 1;
  			kclips += 1;
  		}
  	} else

  		kp->clips = NULL;

  	return 0;
  }
  
  static int put_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
  {

  	if (copy_to_user(&up->w, &kp->w, sizeof(kp->w)) ||

  		put_user(kp->field, &up->field) ||
  		put_user(kp->chromakey, &up->chromakey) ||
  		put_user(kp->clipcount, &up->clipcount))
  			return -EFAULT;

  	return 0;
  }
  
  static inline int get_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
  {

  	if (copy_from_user(kp, up, sizeof(struct v4l2_pix_format)))
  		return -EFAULT;

  	return 0;

  }

  static inline int get_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane *kp,
  				struct v4l2_pix_format_mplane __user *up)
  {
  	if (copy_from_user(kp, up, sizeof(struct v4l2_pix_format_mplane)))
  		return -EFAULT;
  	return 0;
  }

  static inline int put_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
  {

  	if (copy_to_user(up, kp, sizeof(struct v4l2_pix_format)))
  		return -EFAULT;

  	return 0;

  }

  static inline int put_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane *kp,
  				struct v4l2_pix_format_mplane __user *up)
  {
  	if (copy_to_user(up, kp, sizeof(struct v4l2_pix_format_mplane)))
  		return -EFAULT;
  	return 0;
  }

  static inline int get_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
  {

  	if (copy_from_user(kp, up, sizeof(struct v4l2_vbi_format)))
  		return -EFAULT;

  	return 0;

  }
  
  static inline int put_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
  {

  	if (copy_to_user(up, kp, sizeof(struct v4l2_vbi_format)))
  		return -EFAULT;

  	return 0;

  }

  static inline int get_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format *kp, struct v4l2_sliced_vbi_format __user *up)
  {
  	if (copy_from_user(kp, up, sizeof(struct v4l2_sliced_vbi_format)))
  		return -EFAULT;
  	return 0;
  }
  
  static inline int put_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format *kp, struct v4l2_sliced_vbi_format __user *up)
  {
  	if (copy_to_user(up, kp, sizeof(struct v4l2_sliced_vbi_format)))
  		return -EFAULT;
  	return 0;
  }

  struct v4l2_format32 {

  	__u32	type;	/* enum v4l2_buf_type */

  	union {

  		struct v4l2_pix_format	pix;

  		struct v4l2_pix_format_mplane	pix_mp;

  		struct v4l2_window32	win;
  		struct v4l2_vbi_format	vbi;
  		struct v4l2_sliced_vbi_format	sliced;

  		__u8	raw_data[200];        /* user-defined */

  	} fmt;
  };

  /**
   * struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument
   * @index:	on return, index of the first created buffer
   * @count:	entry: number of requested buffers,
   *		return: number of created buffers
   * @memory:	buffer memory type
   * @format:	frame format, for which buffers are requested
   * @reserved:	future extensions
   */

  struct v4l2_create_buffers32 {

  	__u32			index;

  	__u32			count;

  	__u32			memory;	/* enum v4l2_memory */

  	struct v4l2_format32	format;

  	__u32			reserved[8];
  };
  
  static int __get_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)

  {

  	if (get_user(kp->type, &up->type))
  		return -EFAULT;

  	switch (kp->type) {
  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:

  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:

  		return get_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);

  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
  		return get_v4l2_pix_format_mplane(&kp->fmt.pix_mp,
  						  &up->fmt.pix_mp);

  	case V4L2_BUF_TYPE_VIDEO_OVERLAY:

  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:

  		return get_v4l2_window32(&kp->fmt.win, &up->fmt.win);
  	case V4L2_BUF_TYPE_VBI_CAPTURE:

  	case V4L2_BUF_TYPE_VBI_OUTPUT:

  		return get_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);

  	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
  	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
  		return get_v4l2_sliced_vbi_format(&kp->fmt.sliced, &up->fmt.sliced);

  	default:

  		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d
  ",

  								kp->type);

  		return -EINVAL;

  	}
  }

  static int get_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
  {

  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_format32)))
  		return -EFAULT;

  	return __get_v4l2_format32(kp, up);
  }
  
  static int get_v4l2_create32(struct v4l2_create_buffers *kp, struct v4l2_create_buffers32 __user *up)
  {
  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_create_buffers32)) ||

  	    copy_from_user(kp, up, offsetof(struct v4l2_create_buffers32, format)))
  		return -EFAULT;

  	return __get_v4l2_format32(&kp->format, &up->format);
  }
  
  static int __put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)

  {

  	switch (kp->type) {
  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:

  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:

  		return put_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);

  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
  		return put_v4l2_pix_format_mplane(&kp->fmt.pix_mp,
  						  &up->fmt.pix_mp);

  	case V4L2_BUF_TYPE_VIDEO_OVERLAY:

  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:

  		return put_v4l2_window32(&kp->fmt.win, &up->fmt.win);
  	case V4L2_BUF_TYPE_VBI_CAPTURE:

  	case V4L2_BUF_TYPE_VBI_OUTPUT:

  		return put_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);

  	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
  	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
  		return put_v4l2_sliced_vbi_format(&kp->fmt.sliced, &up->fmt.sliced);

  	default:

  		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d
  ",
  								kp->type);
  		return -EINVAL;

  	}
  }

  static int put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
  {
  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_format32)) ||
  		put_user(kp->type, &up->type))
  		return -EFAULT;
  	return __put_v4l2_format32(kp, up);
  }
  
  static int put_v4l2_create32(struct v4l2_create_buffers *kp, struct v4l2_create_buffers32 __user *up)
  {
  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_create_buffers32)) ||
  	    copy_to_user(up, kp, offsetof(struct v4l2_create_buffers32, format.fmt)))
  			return -EFAULT;
  	return __put_v4l2_format32(&kp->format, &up->format);
  }

  struct v4l2_standard32 {

  	__u32		     index;
  	__u32		     id[2]; /* __u64 would get the alignment wrong */
  	__u8		     name[24];
  	struct v4l2_fract    frameperiod; /* Frames, not fields */
  	__u32		     framelines;
  	__u32		     reserved[4];
  };
  
  static int get_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 __user *up)
  {
  	/* other fields are not set by the user, nor used by the driver */

  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_standard32)) ||
  		get_user(kp->index, &up->index))
  		return -EFAULT;
  	return 0;

  }
  
  static int put_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 __user *up)
  {

  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_standard32)) ||

  		put_user(kp->index, &up->index) ||
  		copy_to_user(up->id, &kp->id, sizeof(__u64)) ||
  		copy_to_user(up->name, kp->name, 24) ||
  		copy_to_user(&up->frameperiod, &kp->frameperiod, sizeof(kp->frameperiod)) ||
  		put_user(kp->framelines, &up->framelines) ||
  		copy_to_user(up->reserved, kp->reserved, 4 * sizeof(__u32)))
  			return -EFAULT;
  	return 0;
  }

  struct v4l2_plane32 {
  	__u32			bytesused;
  	__u32			length;
  	union {
  		__u32		mem_offset;
  		compat_long_t	userptr;

  		__s32		fd;

  	} m;
  	__u32			data_offset;
  	__u32			reserved[11];
  };

  struct v4l2_buffer32 {

  	__u32			index;

  	__u32			type;	/* enum v4l2_buf_type */

  	__u32			bytesused;
  	__u32			flags;

  	__u32			field;	/* enum v4l2_field */

  	struct compat_timeval	timestamp;
  	struct v4l2_timecode	timecode;
  	__u32			sequence;
  
  	/* memory location */

  	__u32			memory;	/* enum v4l2_memory */

  	union {
  		__u32           offset;
  		compat_long_t   userptr;

  		compat_caddr_t  planes;

  		__s32		fd;

  	} m;
  	__u32			length;

  	__u32			reserved2;

  	__u32			reserved;
  };

  static int get_v4l2_plane32(struct v4l2_plane *up, struct v4l2_plane32 *up32,
  				enum v4l2_memory memory)
  {
  	void __user *up_pln;
  	compat_long_t p;
  
  	if (copy_in_user(up, up32, 2 * sizeof(__u32)) ||
  		copy_in_user(&up->data_offset, &up32->data_offset,
  				sizeof(__u32)))
  		return -EFAULT;
  
  	if (memory == V4L2_MEMORY_USERPTR) {
  		if (get_user(p, &up32->m.userptr))
  			return -EFAULT;
  		up_pln = compat_ptr(p);
  		if (put_user((unsigned long)up_pln, &up->m.userptr))
  			return -EFAULT;

  	} else if (memory == V4L2_MEMORY_DMABUF) {
  		if (copy_in_user(&up->m.fd, &up32->m.fd, sizeof(int)))
  			return -EFAULT;

  	} else {
  		if (copy_in_user(&up->m.mem_offset, &up32->m.mem_offset,
  					sizeof(__u32)))
  			return -EFAULT;
  	}
  
  	return 0;
  }
  
  static int put_v4l2_plane32(struct v4l2_plane *up, struct v4l2_plane32 *up32,
  				enum v4l2_memory memory)
  {
  	if (copy_in_user(up32, up, 2 * sizeof(__u32)) ||
  		copy_in_user(&up32->data_offset, &up->data_offset,
  				sizeof(__u32)))
  		return -EFAULT;
  
  	/* For MMAP, driver might've set up the offset, so copy it back.
  	 * USERPTR stays the same (was userspace-provided), so no copying. */
  	if (memory == V4L2_MEMORY_MMAP)
  		if (copy_in_user(&up32->m.mem_offset, &up->m.mem_offset,
  					sizeof(__u32)))
  			return -EFAULT;

  	/* For DMABUF, driver might've set up the fd, so copy it back. */
  	if (memory == V4L2_MEMORY_DMABUF)
  		if (copy_in_user(&up32->m.fd, &up->m.fd,
  					sizeof(int)))
  			return -EFAULT;

  
  	return 0;
  }

  static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
  {

  	struct v4l2_plane32 __user *uplane32;
  	struct v4l2_plane __user *uplane;
  	compat_caddr_t p;
  	int num_planes;
  	int ret;

  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_buffer32)) ||
  		get_user(kp->index, &up->index) ||
  		get_user(kp->type, &up->type) ||
  		get_user(kp->flags, &up->flags) ||

  		get_user(kp->memory, &up->memory))

  			return -EFAULT;

  
  	if (V4L2_TYPE_IS_OUTPUT(kp->type))
  		if (get_user(kp->bytesused, &up->bytesused) ||
  			get_user(kp->field, &up->field) ||
  			get_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
  			get_user(kp->timestamp.tv_usec,
  					&up->timestamp.tv_usec))

  			return -EFAULT;

  	if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
  		if (get_user(kp->length, &up->length))

  			return -EFAULT;

  		num_planes = kp->length;
  		if (num_planes == 0) {
  			kp->m.planes = NULL;
  			/* num_planes == 0 is legal, e.g. when userspace doesn't
  			 * need planes array on DQBUF*/
  			return 0;

  		}

  
  		if (get_user(p, &up->m.planes))

  			return -EFAULT;

  
  		uplane32 = compat_ptr(p);
  		if (!access_ok(VERIFY_READ, uplane32,
  				num_planes * sizeof(struct v4l2_plane32)))
  			return -EFAULT;
  
  		/* We don't really care if userspace decides to kill itself
  		 * by passing a very big num_planes value */
  		uplane = compat_alloc_user_space(num_planes *
  						sizeof(struct v4l2_plane));
  		kp->m.planes = uplane;
  
  		while (--num_planes >= 0) {
  			ret = get_v4l2_plane32(uplane, uplane32, kp->memory);
  			if (ret)
  				return ret;
  			++uplane;
  			++uplane32;
  		}
  	} else {
  		switch (kp->memory) {
  		case V4L2_MEMORY_MMAP:
  			if (get_user(kp->length, &up->length) ||
  				get_user(kp->m.offset, &up->m.offset))
  				return -EFAULT;
  			break;
  		case V4L2_MEMORY_USERPTR:
  			{
  			compat_long_t tmp;
  
  			if (get_user(kp->length, &up->length) ||
  			    get_user(tmp, &up->m.userptr))
  				return -EFAULT;
  
  			kp->m.userptr = (unsigned long)compat_ptr(tmp);
  			}
  			break;
  		case V4L2_MEMORY_OVERLAY:
  			if (get_user(kp->m.offset, &up->m.offset))
  				return -EFAULT;
  			break;

  		case V4L2_MEMORY_DMABUF:
  			if (get_user(kp->m.fd, &up->m.fd))
  				return -EFAULT;
  			break;

  		}

  	}

  	return 0;
  }
  
  static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
  {

  	struct v4l2_plane32 __user *uplane32;
  	struct v4l2_plane __user *uplane;
  	compat_caddr_t p;
  	int num_planes;
  	int ret;

  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_buffer32)) ||
  		put_user(kp->index, &up->index) ||
  		put_user(kp->type, &up->type) ||
  		put_user(kp->flags, &up->flags) ||

  		put_user(kp->memory, &up->memory))

  			return -EFAULT;

  	if (put_user(kp->bytesused, &up->bytesused) ||
  		put_user(kp->field, &up->field) ||
  		put_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
  		put_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec) ||
  		copy_to_user(&up->timecode, &kp->timecode, sizeof(struct v4l2_timecode)) ||
  		put_user(kp->sequence, &up->sequence) ||

  		put_user(kp->reserved2, &up->reserved2) ||

  		put_user(kp->reserved, &up->reserved))

  			return -EFAULT;

  
  	if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
  		num_planes = kp->length;
  		if (num_planes == 0)
  			return 0;
  
  		uplane = kp->m.planes;
  		if (get_user(p, &up->m.planes))
  			return -EFAULT;
  		uplane32 = compat_ptr(p);
  
  		while (--num_planes >= 0) {
  			ret = put_v4l2_plane32(uplane, uplane32, kp->memory);
  			if (ret)
  				return ret;
  			++uplane;
  			++uplane32;
  		}
  	} else {
  		switch (kp->memory) {
  		case V4L2_MEMORY_MMAP:
  			if (put_user(kp->length, &up->length) ||
  				put_user(kp->m.offset, &up->m.offset))
  				return -EFAULT;
  			break;
  		case V4L2_MEMORY_USERPTR:
  			if (put_user(kp->length, &up->length) ||
  				put_user(kp->m.userptr, &up->m.userptr))
  				return -EFAULT;
  			break;
  		case V4L2_MEMORY_OVERLAY:
  			if (put_user(kp->m.offset, &up->m.offset))
  				return -EFAULT;
  			break;

  		case V4L2_MEMORY_DMABUF:
  			if (put_user(kp->m.fd, &up->m.fd))
  				return -EFAULT;
  			break;

  		}
  	}

  	return 0;
  }

  struct v4l2_framebuffer32 {

  	__u32			capability;
  	__u32			flags;
  	compat_caddr_t 		base;
  	struct v4l2_pix_format	fmt;
  };

  static int get_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
  {
  	u32 tmp;

  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_framebuffer32)) ||
  		get_user(tmp, &up->base) ||
  		get_user(kp->capability, &up->capability) ||
  		get_user(kp->flags, &up->flags))
  			return -EFAULT;

  	kp->base = compat_ptr(tmp);

  	get_v4l2_pix_format(&kp->fmt, &up->fmt);
  	return 0;
  }

  static int put_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
  {
  	u32 tmp = (u32)((unsigned long)kp->base);

  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_framebuffer32)) ||

  		put_user(tmp, &up->base) ||
  		put_user(kp->capability, &up->capability) ||
  		put_user(kp->flags, &up->flags))
  			return -EFAULT;

  	put_v4l2_pix_format(&kp->fmt, &up->fmt);
  	return 0;
  }

  struct v4l2_input32 {
  	__u32	     index;		/*  Which input */
  	__u8	     name[32];		/*  Label */
  	__u32	     type;		/*  Type of input */
  	__u32	     audioset;		/*  Associated audios (bitfield) */
  	__u32        tuner;             /*  Associated tuner */
  	v4l2_std_id  std;
  	__u32	     status;
  	__u32	     reserved[4];
  } __attribute__ ((packed));
  
  /* The 64-bit v4l2_input struct has extra padding at the end of the struct.
     Otherwise it is identical to the 32-bit version. */
  static inline int get_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 __user *up)

  {

  	if (copy_from_user(kp, up, sizeof(struct v4l2_input32)))

  		return -EFAULT;

  	return 0;
  }

  static inline int put_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 __user *up)

  {

  	if (copy_to_user(up, kp, sizeof(struct v4l2_input32)))

  		return -EFAULT;

  	return 0;
  }

  struct v4l2_ext_controls32 {
         __u32 ctrl_class;
         __u32 count;
         __u32 error_idx;
         __u32 reserved[2];
         compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */

  };

  struct v4l2_ext_control32 {
  	__u32 id;
  	__u32 size;
  	__u32 reserved2[1];
  	union {
  		__s32 value;
  		__s64 value64;
  		compat_caddr_t string; /* actually char * */
  	};
  } __attribute__ ((packed));
  
  /* The following function really belong in v4l2-common, but that causes
     a circular dependency between modules. We need to think about this, but
     for now this will do. */
  
  /* Return non-zero if this control is a pointer type. Currently only

     type STRING is a pointer type. */

  static inline int ctrl_is_pointer(u32 id)
  {

  	switch (id) {
  	case V4L2_CID_RDS_TX_PS_NAME:
  	case V4L2_CID_RDS_TX_RADIO_TEXT:
  		return 1;
  	default:
  		return 0;
  	}

  }

  static int get_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext_controls32 __user *up)

  {

  	struct v4l2_ext_control32 __user *ucontrols;

  	struct v4l2_ext_control __user *kcontrols;
  	int n;
  	compat_caddr_t p;
  
  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_ext_controls32)) ||
  		get_user(kp->ctrl_class, &up->ctrl_class) ||
  		get_user(kp->count, &up->count) ||
  		get_user(kp->error_idx, &up->error_idx) ||
  		copy_from_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
  			return -EFAULT;
  	n = kp->count;
  	if (n == 0) {
  		kp->controls = NULL;
  		return 0;
  	}
  	if (get_user(p, &up->controls))
  		return -EFAULT;
  	ucontrols = compat_ptr(p);

  	if (!access_ok(VERIFY_READ, ucontrols,
  			n * sizeof(struct v4l2_ext_control32)))

  		return -EFAULT;
  	kcontrols = compat_alloc_user_space(n * sizeof(struct v4l2_ext_control));
  	kp->controls = kcontrols;
  	while (--n >= 0) {

  		if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols)))

  			return -EFAULT;

  		if (ctrl_is_pointer(kcontrols->id)) {
  			void __user *s;
  
  			if (get_user(p, &ucontrols->string))
  				return -EFAULT;
  			s = compat_ptr(p);
  			if (put_user(s, &kcontrols->string))
  				return -EFAULT;
  		}

  		ucontrols++;
  		kcontrols++;
  	}

  	return 0;
  }

  static int put_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext_controls32 __user *up)

  {

  	struct v4l2_ext_control32 __user *ucontrols;

  	struct v4l2_ext_control __user *kcontrols = kp->controls;
  	int n = kp->count;
  	compat_caddr_t p;
  
  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_ext_controls32)) ||
  		put_user(kp->ctrl_class, &up->ctrl_class) ||
  		put_user(kp->count, &up->count) ||
  		put_user(kp->error_idx, &up->error_idx) ||
  		copy_to_user(up->reserved, kp->reserved, sizeof(up->reserved)))
  			return -EFAULT;
  	if (!kp->count)
  		return 0;

  	if (get_user(p, &up->controls))

  		return -EFAULT;

  	ucontrols = compat_ptr(p);

  	if (!access_ok(VERIFY_WRITE, ucontrols,
  			n * sizeof(struct v4l2_ext_control32)))

  		return -EFAULT;

  	while (--n >= 0) {

  		unsigned size = sizeof(*ucontrols);
  
  		/* Do not modify the pointer when copying a pointer control.
  		   The contents of the pointer was changed, not the pointer
  		   itself. */
  		if (ctrl_is_pointer(kcontrols->id))
  			size -= sizeof(ucontrols->value64);
  		if (copy_in_user(ucontrols, kcontrols, size))

  			return -EFAULT;
  		ucontrols++;
  		kcontrols++;

  	}

  	return 0;

  }

  struct v4l2_event32 {
  	__u32				type;
  	union {
  		__u8			data[64];
  	} u;
  	__u32				pending;
  	__u32				sequence;
  	struct compat_timespec		timestamp;
  	__u32				id;
  	__u32				reserved[8];
  };
  
  static int put_v4l2_event32(struct v4l2_event *kp, struct v4l2_event32 __user *up)
  {
  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_event32)) ||
  		put_user(kp->type, &up->type) ||
  		copy_to_user(&up->u, &kp->u, sizeof(kp->u)) ||
  		put_user(kp->pending, &up->pending) ||
  		put_user(kp->sequence, &up->sequence) ||

  		compat_put_timespec(&kp->timestamp, &up->timestamp) ||

  		put_user(kp->id, &up->id) ||
  		copy_to_user(up->reserved, kp->reserved, 8 * sizeof(__u32)))
  			return -EFAULT;
  	return 0;
  }

  struct v4l2_edid32 {

  	__u32 pad;
  	__u32 start_block;
  	__u32 blocks;
  	__u32 reserved[5];
  	compat_caddr_t edid;
  };

  static int get_v4l2_edid32(struct v4l2_edid *kp, struct v4l2_edid32 __user *up)

  {
  	u32 tmp;

  	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_edid32)) ||

  		get_user(kp->pad, &up->pad) ||
  		get_user(kp->start_block, &up->start_block) ||
  		get_user(kp->blocks, &up->blocks) ||
  		get_user(tmp, &up->edid) ||
  		copy_from_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
  			return -EFAULT;
  	kp->edid = compat_ptr(tmp);
  	return 0;
  }

  static int put_v4l2_edid32(struct v4l2_edid *kp, struct v4l2_edid32 __user *up)

  {
  	u32 tmp = (u32)((unsigned long)kp->edid);

  	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_edid32)) ||

  		put_user(kp->pad, &up->pad) ||
  		put_user(kp->start_block, &up->start_block) ||
  		put_user(kp->blocks, &up->blocks) ||
  		put_user(tmp, &up->edid) ||
  		copy_to_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
  			return -EFAULT;
  	return 0;
  }

  #define VIDIOC_G_FMT32		_IOWR('V',  4, struct v4l2_format32)
  #define VIDIOC_S_FMT32		_IOWR('V',  5, struct v4l2_format32)
  #define VIDIOC_QUERYBUF32	_IOWR('V',  9, struct v4l2_buffer32)
  #define VIDIOC_G_FBUF32		_IOR ('V', 10, struct v4l2_framebuffer32)
  #define VIDIOC_S_FBUF32		_IOW ('V', 11, struct v4l2_framebuffer32)
  #define VIDIOC_QBUF32		_IOWR('V', 15, struct v4l2_buffer32)
  #define VIDIOC_DQBUF32		_IOWR('V', 17, struct v4l2_buffer32)
  #define VIDIOC_ENUMSTD32	_IOWR('V', 25, struct v4l2_standard32)
  #define VIDIOC_ENUMINPUT32	_IOWR('V', 26, struct v4l2_input32)

  #define VIDIOC_G_EDID32		_IOWR('V', 40, struct v4l2_edid32)
  #define VIDIOC_S_EDID32		_IOWR('V', 41, struct v4l2_edid32)

  #define VIDIOC_TRY_FMT32      	_IOWR('V', 64, struct v4l2_format32)
  #define VIDIOC_G_EXT_CTRLS32    _IOWR('V', 71, struct v4l2_ext_controls32)
  #define VIDIOC_S_EXT_CTRLS32    _IOWR('V', 72, struct v4l2_ext_controls32)
  #define VIDIOC_TRY_EXT_CTRLS32  _IOWR('V', 73, struct v4l2_ext_controls32)

  #define	VIDIOC_DQEVENT32	_IOR ('V', 89, struct v4l2_event32)

  #define VIDIOC_CREATE_BUFS32	_IOWR('V', 92, struct v4l2_create_buffers32)
  #define VIDIOC_PREPARE_BUF32	_IOWR('V', 93, struct v4l2_buffer32)

  
  #define VIDIOC_OVERLAY32	_IOW ('V', 14, s32)

  #define VIDIOC_STREAMON32	_IOW ('V', 18, s32)
  #define VIDIOC_STREAMOFF32	_IOW ('V', 19, s32)
  #define VIDIOC_G_INPUT32	_IOR ('V', 38, s32)
  #define VIDIOC_S_INPUT32	_IOWR('V', 39, s32)
  #define VIDIOC_G_OUTPUT32	_IOR ('V', 46, s32)
  #define VIDIOC_S_OUTPUT32	_IOWR('V', 47, s32)

  static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

  {
  	union {

  		struct v4l2_format v2f;
  		struct v4l2_buffer v2b;
  		struct v4l2_framebuffer v2fb;

  		struct v4l2_input v2i;

  		struct v4l2_standard v2s;
  		struct v4l2_ext_controls v2ecs;

  		struct v4l2_event v2ev;

  		struct v4l2_create_buffers v2crt;

  		struct v4l2_edid v2edid;

  		unsigned long vx;

  		int vi;

  	} karg;

  	void __user *up = compat_ptr(arg);

  	int compatible_arg = 1;

  	long err = 0;

  
  	/* First, convert the command. */

  	switch (cmd) {

  	case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break;
  	case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break;
  	case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break;
  	case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break;
  	case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break;
  	case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break;
  	case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break;
  	case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break;
  	case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break;
  	case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break;
  	case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break;
  	case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break;
  	case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break;

  	case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break;

  	case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break;

  	case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break;
  	case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
  	case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
  	case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
  	case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break;
  	case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;

  	case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
  	case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break;

  	case VIDIOC_G_EDID32: cmd = VIDIOC_G_EDID; break;
  	case VIDIOC_S_EDID32: cmd = VIDIOC_S_EDID; break;

  	}

  	switch (cmd) {

  	case VIDIOC_OVERLAY:

  	case VIDIOC_STREAMON:
  	case VIDIOC_STREAMOFF:

  	case VIDIOC_S_INPUT:
  	case VIDIOC_S_OUTPUT:
  		err = get_user(karg.vi, (s32 __user *)up);
  		compatible_arg = 0;

  		break;

  	case VIDIOC_G_INPUT:
  	case VIDIOC_G_OUTPUT:

  		compatible_arg = 0;
  		break;

  	case VIDIOC_G_EDID:
  	case VIDIOC_S_EDID:
  		err = get_v4l2_edid32(&karg.v2edid, up);

  		compatible_arg = 0;
  		break;

  	case VIDIOC_G_FMT:
  	case VIDIOC_S_FMT:
  	case VIDIOC_TRY_FMT:
  		err = get_v4l2_format32(&karg.v2f, up);
  		compatible_arg = 0;
  		break;

  	case VIDIOC_CREATE_BUFS:
  		err = get_v4l2_create32(&karg.v2crt, up);
  		compatible_arg = 0;
  		break;
  
  	case VIDIOC_PREPARE_BUF:

  	case VIDIOC_QUERYBUF:
  	case VIDIOC_QBUF:
  	case VIDIOC_DQBUF:
  		err = get_v4l2_buffer32(&karg.v2b, up);
  		compatible_arg = 0;
  		break;

  	case VIDIOC_S_FBUF:
  		err = get_v4l2_framebuffer32(&karg.v2fb, up);

  		compatible_arg = 0;
  		break;

  	case VIDIOC_G_FBUF:

  		compatible_arg = 0;
  		break;

  	case VIDIOC_ENUMSTD:
  		err = get_v4l2_standard32(&karg.v2s, up);

  		compatible_arg = 0;
  		break;

  	case VIDIOC_ENUMINPUT:

  		err = get_v4l2_input32(&karg.v2i, up);
  		compatible_arg = 0;
  		break;

  	case VIDIOC_G_EXT_CTRLS:
  	case VIDIOC_S_EXT_CTRLS:
  	case VIDIOC_TRY_EXT_CTRLS:
  		err = get_v4l2_ext_controls32(&karg.v2ecs, up);

  		compatible_arg = 0;
  		break;

  	case VIDIOC_DQEVENT:
  		compatible_arg = 0;
  		break;

  	}

  	if (err)

  		return err;

  	if (compatible_arg)

  		err = native_ioctl(file, cmd, (unsigned long)up);

  	else {
  		mm_segment_t old_fs = get_fs();

  		set_fs(KERNEL_DS);

  		err = native_ioctl(file, cmd, (unsigned long)&karg);

  		set_fs(old_fs);
  	}

  
  	/* Special case: even after an error we need to put the
  	   results back for these ioctls since the error_idx will
  	   contain information on which control failed. */
  	switch (cmd) {
  	case VIDIOC_G_EXT_CTRLS:
  	case VIDIOC_S_EXT_CTRLS:
  	case VIDIOC_TRY_EXT_CTRLS:
  		if (put_v4l2_ext_controls32(&karg.v2ecs, up))
  			err = -EFAULT;
  		break;
  	}
  	if (err)
  		return err;
  
  	switch (cmd) {

  	case VIDIOC_S_INPUT:
  	case VIDIOC_S_OUTPUT:
  	case VIDIOC_G_INPUT:
  	case VIDIOC_G_OUTPUT:
  		err = put_user(((s32)karg.vi), (s32 __user *)up);
  		break;

  	case VIDIOC_G_FBUF:
  		err = put_v4l2_framebuffer32(&karg.v2fb, up);
  		break;

  	case VIDIOC_DQEVENT:
  		err = put_v4l2_event32(&karg.v2ev, up);
  		break;

  	case VIDIOC_G_EDID:
  	case VIDIOC_S_EDID:
  		err = put_v4l2_edid32(&karg.v2edid, up);

  		break;

  	case VIDIOC_G_FMT:
  	case VIDIOC_S_FMT:
  	case VIDIOC_TRY_FMT:
  		err = put_v4l2_format32(&karg.v2f, up);
  		break;

  	case VIDIOC_CREATE_BUFS:
  		err = put_v4l2_create32(&karg.v2crt, up);
  		break;

  	case VIDIOC_QUERYBUF:
  	case VIDIOC_QBUF:
  	case VIDIOC_DQBUF:
  		err = put_v4l2_buffer32(&karg.v2b, up);
  		break;
  
  	case VIDIOC_ENUMSTD:
  		err = put_v4l2_standard32(&karg.v2s, up);
  		break;
  
  	case VIDIOC_ENUMINPUT:
  		err = put_v4l2_input32(&karg.v2i, up);
  		break;

  	}

  	return err;
  }

  long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)

  {

  	struct video_device *vdev = video_devdata(file);

  	long ret = -ENOIOCTLCMD;

  	if (!file->f_op->unlocked_ioctl)

  		return ret;

  	if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)

  		ret = do_video_ioctl(file, cmd, arg);

  	else if (vdev->fops->compat_ioctl32)
  		ret = vdev->fops->compat_ioctl32(file, cmd, arg);

  	if (ret == -ENOIOCTLCMD)
  		pr_warn("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)
  ",
  			_IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd);

  	return ret;

  }

  EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);