[media] v4l: move v4l2 core into a separate directory

Currently, the v4l2 core is mixed together with other non-core drivers.
Move them into a separate directory.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 1045 insertions, 0 deletions

diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
new file mode 100644
index 000000000000..9ebd5c540d10
--- /dev/null
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -0,0 +1,1045 @@
+/*
+ * 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 <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)
+{
+	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);
+	case V4L2_BUF_TYPE_PRIVATE:
+		if (copy_from_user(kp, up, sizeof(kp->fmt.raw_data)))
+			return -EFAULT;
+		return 0;
+	default:
+		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
+								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)) ||
+			get_user(kp->type, &up->type))
+			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.fmt)))
+			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);
+	case V4L2_BUF_TYPE_PRIVATE:
+		if (copy_to_user(up, kp, sizeof(up->fmt.raw_data)))
+			return -EFAULT;
+		return 0;
+	default:
+		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
+								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;
+	} 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;
+	} 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 (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;
+
+	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;
+		}
+	}
+
+	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;
+		}
+	}
+
+	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) ||
+		put_compat_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;
+}
+
+#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_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;
+		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;
+	}
+
+	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_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_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;
+
+	switch (cmd) {
+	case VIDIOC_QUERYCAP:
+	case VIDIOC_RESERVED:
+	case VIDIOC_ENUM_FMT:
+	case VIDIOC_G_FMT32:
+	case VIDIOC_S_FMT32:
+	case VIDIOC_REQBUFS:
+	case VIDIOC_QUERYBUF32:
+	case VIDIOC_G_FBUF32:
+	case VIDIOC_S_FBUF32:
+	case VIDIOC_OVERLAY32:
+	case VIDIOC_QBUF32:
+	case VIDIOC_DQBUF32:
+	case VIDIOC_STREAMON32:
+	case VIDIOC_STREAMOFF32:
+	case VIDIOC_G_PARM:
+	case VIDIOC_S_PARM:
+	case VIDIOC_G_STD:
+	case VIDIOC_S_STD:
+	case VIDIOC_ENUMSTD32:
+	case VIDIOC_ENUMINPUT32:
+	case VIDIOC_G_CTRL:
+	case VIDIOC_S_CTRL:
+	case VIDIOC_G_TUNER:
+	case VIDIOC_S_TUNER:
+	case VIDIOC_G_AUDIO:
+	case VIDIOC_S_AUDIO:
+	case VIDIOC_QUERYCTRL:
+	case VIDIOC_QUERYMENU:
+	case VIDIOC_G_INPUT32:
+	case VIDIOC_S_INPUT32:
+	case VIDIOC_G_OUTPUT32:
+	case VIDIOC_S_OUTPUT32:
+	case VIDIOC_ENUMOUTPUT:
+	case VIDIOC_G_AUDOUT:
+	case VIDIOC_S_AUDOUT:
+	case VIDIOC_G_MODULATOR:
+	case VIDIOC_S_MODULATOR:
+	case VIDIOC_S_FREQUENCY:
+	case VIDIOC_G_FREQUENCY:
+	case VIDIOC_CROPCAP:
+	case VIDIOC_G_CROP:
+	case VIDIOC_S_CROP:
+	case VIDIOC_G_SELECTION:
+	case VIDIOC_S_SELECTION:
+	case VIDIOC_G_JPEGCOMP:
+	case VIDIOC_S_JPEGCOMP:
+	case VIDIOC_QUERYSTD:
+	case VIDIOC_TRY_FMT32:
+	case VIDIOC_ENUMAUDIO:
+	case VIDIOC_ENUMAUDOUT:
+	case VIDIOC_G_PRIORITY:
+	case VIDIOC_S_PRIORITY:
+	case VIDIOC_G_SLICED_VBI_CAP:
+	case VIDIOC_LOG_STATUS:
+	case VIDIOC_G_EXT_CTRLS32:
+	case VIDIOC_S_EXT_CTRLS32:
+	case VIDIOC_TRY_EXT_CTRLS32:
+	case VIDIOC_ENUM_FRAMESIZES:
+	case VIDIOC_ENUM_FRAMEINTERVALS:
+	case VIDIOC_G_ENC_INDEX:
+	case VIDIOC_ENCODER_CMD:
+	case VIDIOC_TRY_ENCODER_CMD:
+	case VIDIOC_DECODER_CMD:
+	case VIDIOC_TRY_DECODER_CMD:
+	case VIDIOC_DBG_S_REGISTER:
+	case VIDIOC_DBG_G_REGISTER:
+	case VIDIOC_DBG_G_CHIP_IDENT:
+	case VIDIOC_S_HW_FREQ_SEEK:
+	case VIDIOC_ENUM_DV_PRESETS:
+	case VIDIOC_S_DV_PRESET:
+	case VIDIOC_G_DV_PRESET:
+	case VIDIOC_QUERY_DV_PRESET:
+	case VIDIOC_S_DV_TIMINGS:
+	case VIDIOC_G_DV_TIMINGS:
+	case VIDIOC_DQEVENT:
+	case VIDIOC_DQEVENT32:
+	case VIDIOC_SUBSCRIBE_EVENT:
+	case VIDIOC_UNSUBSCRIBE_EVENT:
+	case VIDIOC_CREATE_BUFS32:
+	case VIDIOC_PREPARE_BUF32:
+	case VIDIOC_ENUM_DV_TIMINGS:
+	case VIDIOC_QUERY_DV_TIMINGS:
+	case VIDIOC_DV_TIMINGS_CAP:
+	case VIDIOC_ENUM_FREQ_BANDS:
+		ret = do_video_ioctl(file, cmd, arg);
+		break;
+
+	default:
+		if (vdev->fops->compat_ioctl32)
+			ret = vdev->fops->compat_ioctl32(file, cmd, arg);
+
+		if (ret == -ENOIOCTLCMD)
+			printk(KERN_WARNING "compat_ioctl32: "
+				"unknown ioctl '%c', dir=%d, #%d (0x%08x)\n",
+				_IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd),
+				cmd);
+		break;
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);