V4L/DVB (3120): Adds 32-bit compatibility for v4l2 framegrabber ioctls.

- Adds 32-bit compatibility for v4l2 framegrabber ioctls.
Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

drivers/media/video/compat_ioctl32.c

+/*
+ * 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@suse.cz)
+ * Copyright (C) 2005       Philippe De Muyter (phdm@macqel.be)
+ *
+ * These routines maintain argument size conversion between 32bit and 64bit
+ * ioctls.
+ */
+
 #include <linux/config.h>
 #include <linux/compat.h>
 #include <linux/videodev.h>
+#include <linux/videodev2.h>
 #include <linux/module.h>
 #include <linux/smp_lock.h>
 
@@ -15,12 +30,9 @@ struct video_tuner32 {
 
 static int get_video_tuner32(struct video_tuner *kp, struct video_tuner32 __user *up)
 {
-	int i;
-
 	if(get_user(kp->tuner, &up->tuner))
 		return -EFAULT;
-	for(i = 0; i < 32; i++)
-		__get_user(kp->name[i], &up->name[i]);
+	__copy_from_user(kp->name, up->name, 32);
 	__get_user(kp->rangelow, &up->rangelow);
 	__get_user(kp->rangehigh, &up->rangehigh);
 	__get_user(kp->flags, &up->flags);
@@ -31,12 +43,9 @@ static int get_video_tuner32(struct video_tuner *kp, struct video_tuner32 __user
 
 static int put_video_tuner32(struct video_tuner *kp, struct video_tuner32 __user *up)
 {
-	int i;
-
 	if(put_user(kp->tuner, &up->tuner))
 		return -EFAULT;
-	for(i = 0; i < 32; i++)
-		__put_user(kp->name[i], &up->name[i]);
+	__copy_to_user(up->name, kp->name, 32);
 	__put_user(kp->rangelow, &up->rangelow);
 	__put_user(kp->rangehigh, &up->rangehigh);
 	__put_user(kp->flags, &up->flags);
@@ -123,6 +132,265 @@ static int put_video_window32(struct video_window *kp, struct video_window32 __u
 	return 0;
 }
 
+struct v4l2_clip32
+{
+	struct v4l2_rect        c;
+	compat_caddr_t 		next;
+};
+
+struct v4l2_window32
+{
+	struct v4l2_rect        w;
+	enum v4l2_field  	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 (copy_from_user(&kp->w, &up->w, sizeof(up->w)))
+		return -EFAULT;
+	__get_user(kp->field, &up->field);
+	__get_user(kp->chromakey, &up->chromakey);
+	__get_user(kp->clipcount, &up->clipcount);
+	if (kp->clipcount > 2048)
+		return -EINVAL;
+	if (kp->clipcount) {
+		struct v4l2_clip32 *uclips = compat_ptr(up->clips);
+		struct v4l2_clip *kclips;
+		int n = kp->clipcount;
+
+		kclips = compat_alloc_user_space(n * sizeof(struct v4l2_clip));
+		kp->clips = kclips;
+		while (--n >= 0) {
+			copy_from_user(&kclips->c, &uclips->c, sizeof(uclips->c));
+			kclips->next = n ? kclips + 1 : 0;
+			uclips += 1;
+			kclips += 1;
+		}
+	} else
+		kp->clips = 0;
+	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(up->w)))
+		return -EFAULT;
+	__put_user(kp->field, &up->field);
+	__put_user(kp->chromakey, &up->chromakey);
+	__put_user(kp->clipcount, &up->clipcount);
+	return 0;
+}
+
+static inline int get_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
+{
+	return copy_from_user(kp, up, sizeof(struct v4l2_pix_format));
+}
+
+static inline int put_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
+{
+	return copy_to_user(up, kp, sizeof(struct v4l2_pix_format));
+}
+
+static inline int get_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
+{
+	return copy_from_user(kp, up, sizeof(struct v4l2_vbi_format));
+}
+
+static inline int put_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
+{
+	return copy_to_user(up, kp, sizeof(struct v4l2_vbi_format));
+}
+
+struct v4l2_format32
+{
+	enum v4l2_buf_type type;
+	union
+	{
+		struct v4l2_pix_format	pix;  // V4L2_BUF_TYPE_VIDEO_CAPTURE
+		struct v4l2_window32	win;  // V4L2_BUF_TYPE_VIDEO_OVERLAY
+		struct v4l2_vbi_format	vbi;  // V4L2_BUF_TYPE_VBI_CAPTURE
+		__u8	raw_data[200];        // user-defined
+	} fmt;
+};
+
+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:
+		return get_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);
+	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
+		return get_v4l2_window32(&kp->fmt.win, &up->fmt.win);
+	case V4L2_BUF_TYPE_VBI_CAPTURE:
+		return get_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);
+	default:
+		printk("compat_ioctl : unexpected VIDIOC_FMT type %d\n",
+								kp->type);
+		return -ENXIO;
+	}
+}
+
+static int put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
+{
+	if(put_user(kp->type, &up->type))
+		return -EFAULT;
+	switch (kp->type) {
+	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+		return put_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);
+	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
+		return put_v4l2_window32(&kp->fmt.win, &up->fmt.win);
+	case V4L2_BUF_TYPE_VBI_CAPTURE:
+		return put_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);
+	default:
+		return -ENXIO;
+	}
+}
+
+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 */
+	return get_user(kp->index, &up->index);
+}
+
+static int put_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 __user *up)
+{
+	if(put_user(kp->index, &up->index))
+		return -EFAULT;
+	__copy_to_user(up->id, &kp->id, sizeof(__u64));
+	__copy_to_user(up->name, kp->name, 24);
+	__put_user(kp->frameperiod, &up->frameperiod);
+	__put_user(kp->framelines, &up->framelines);
+	__copy_to_user(up->reserved, kp->reserved, 4 * sizeof(__u32));
+	return 0;
+}
+
+struct v4l2_buffer32
+{
+	__u32			index;
+	enum v4l2_buf_type      type;
+	__u32			bytesused;
+	__u32			flags;
+	enum v4l2_field		field;
+	struct compat_timeval	timestamp;
+	struct v4l2_timecode	timecode;
+	__u32			sequence;
+
+	/* memory location */
+	enum v4l2_memory        memory;
+	union {
+		__u32           offset;
+		compat_long_t   userptr;
+	} m;
+	__u32			length;
+	__u32			input;
+	__u32			reserved;
+};
+
+static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
+{
+
+	if (get_user(kp->index, &up->index))
+		return -EFAULT;
+	__get_user(kp->type, &up->type);
+	__get_user(kp->flags, &up->flags);
+	__get_user(kp->memory, &up->memory);
+	__get_user(kp->input, &up->input);
+	switch(kp->memory) {
+	case V4L2_MEMORY_MMAP:
+		break;
+	case V4L2_MEMORY_USERPTR:
+		{
+		unsigned long tmp = (unsigned long)compat_ptr(up->m.userptr);
+
+		__get_user(kp->length, &up->length);
+		__get_user(kp->m.userptr, &tmp);
+		}
+		break;
+	case V4L2_MEMORY_OVERLAY:
+		__get_user(kp->m.offset, &up->m.offset);
+		break;
+	}
+	return 0;
+}
+
+static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
+{
+	if (put_user(kp->index, &up->index))
+		return -EFAULT;
+	__put_user(kp->type, &up->type);
+	__put_user(kp->flags, &up->flags);
+	__put_user(kp->memory, &up->memory);
+	__put_user(kp->input, &up->input);
+	switch(kp->memory) {
+	case V4L2_MEMORY_MMAP:
+		__put_user(kp->length, &up->length);
+		__put_user(kp->m.offset, &up->m.offset);
+		break;
+	case V4L2_MEMORY_USERPTR:
+		__put_user(kp->length, &up->length);
+		__put_user(kp->m.userptr, &up->m.userptr);
+		break;
+	case V4L2_MEMORY_OVERLAY:
+		__put_user(kp->m.offset, &up->m.offset);
+		break;
+	}
+	__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->reserved, &up->reserved);
+	return 0;
+}
+
+struct v4l2_framebuffer32
+{
+	__u32			capability;
+	__u32			flags;
+	compat_caddr_t 		base;
+	struct v4l2_pix_format	fmt;
+};
+
+static int put_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
+{
+	u32 tmp = (u32)((unsigned long)kp->base);
+
+	if(put_user(tmp, &up->base))
+		return -EFAULT;
+	__put_user(kp->capability, &up->capability);
+	__put_user(kp->flags, &up->flags);
+	put_v4l2_pix_format(&kp->fmt, &up->fmt);
+	return 0;
+}
+
+struct v4l2_input32 	/* identical layout, but different size */
+{
+	__u32	     index;		/*  Which input */
+	__u8	     name[32];		/*  Label */
+	__u32	     type;		/*  Type of input */
+	__u32	     audioset;		/*  Associated audios (bitfield) */
+	__u32        tuner;             /*  Associated tuner */
+	__u32	     std[2];		/* __u64 would get the padding wrong */
+	__u32	     status;
+	__u32	     reserved[4];
+};
+
 #define VIDIOCGTUNER32		_IOWR('v',4, struct video_tuner32)
 #define VIDIOCSTUNER32		_IOW('v',5, struct video_tuner32)
 #define VIDIOCGWIN32		_IOR('v',9, struct video_window32)
@@ -132,6 +400,24 @@ static int put_video_window32(struct video_window *kp, struct video_window32 __u
 #define VIDIOCGFREQ32		_IOR('v',14, u32)
 #define VIDIOCSFREQ32		_IOW('v',15, u32)
 
+#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)
+/* VIDIOC_OVERLAY is now _IOW, but was _IOWR */
+#define VIDIOC_OVERLAY32	_IOWR ('V', 14, compat_int_t)
+#define VIDIOC_QBUF32		_IOWR ('V', 15, struct v4l2_buffer32)
+#define VIDIOC_DQBUF32		_IOWR ('V', 17, struct v4l2_buffer32)
+#define VIDIOC_STREAMON32	_IOW  ('V', 18, compat_int_t)
+#define VIDIOC_STREAMOFF32	_IOW  ('V', 19, compat_int_t)
+#define VIDIOC_ENUMSTD32	_IOWR ('V', 25, struct v4l2_standard32)
+#define VIDIOC_ENUMINPUT32	_IOWR ('V', 26, struct v4l2_input32)
+/* VIDIOC_S_CTRL is now _IOWR, but was _IOW */
+#define VIDIOC_S_CTRL32		_IOW  ('V', 28, struct v4l2_control)
+#define VIDIOC_G_INPUT32	_IOR  ('V', 38, compat_int_t)
+#define VIDIOC_S_INPUT32	_IOWR ('V', 39, compat_int_t)
+#define VIDIOC_TRY_FMT32      	_IOWR ('V', 64, struct v4l2_format32)
+
 enum {
 	MaxClips = (~0U-sizeof(struct video_window))/sizeof(struct video_clip)
 };
@@ -198,10 +484,14 @@ static int do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg
 		struct video_tuner vt;
 		struct video_buffer vb;
 		struct video_window vw;
+		struct v4l2_format v2f;
+		struct v4l2_buffer v2b;
+		struct v4l2_framebuffer v2fb;
+		struct v4l2_standard v2s;
 		unsigned long vx;
 	} karg;
-	mm_segment_t old_fs = get_fs();
 	void __user *up = compat_ptr(arg);
+	int compatible_arg = 1;
 	int err = 0;
 
 	/* First, convert the command. */
@@ -213,29 +503,82 @@ static int do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg
 	case VIDIOCSFBUF32: cmd = VIDIOCSFBUF; break;
 	case VIDIOCGFREQ32: cmd = VIDIOCGFREQ; break;
 	case VIDIOCSFREQ32: cmd = VIDIOCSFREQ; break;
+	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_QBUF32: cmd = VIDIOC_QBUF; break;
+	case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break;
+	case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break;
+	case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
+	case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break;
+	case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break;
+	case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break;
+	case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break;
+	case VIDIOC_S_CTRL32: cmd = VIDIOC_S_CTRL; break;
+	case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
+	case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
+	case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break;
 	};
 
 	switch(cmd) {
 	case VIDIOCSTUNER:
 	case VIDIOCGTUNER:
 		err = get_video_tuner32(&karg.vt, up);
+		compatible_arg = 0;
+
 		break;
 
 	case VIDIOCSFBUF:
 		err = get_video_buffer32(&karg.vb, up);
+		compatible_arg = 0;
 		break;
 
 	case VIDIOCSFREQ:
+	case VIDIOC_S_INPUT:
+	case VIDIOC_OVERLAY:
 		err = get_user(karg.vx, (u32 __user *)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_QUERYBUF:
+	case VIDIOC_QBUF:
+	case VIDIOC_DQBUF:
+		err = get_v4l2_buffer32(&karg.v2b, up);
+		compatible_arg = 0;
+		break;
+
+	case VIDIOC_ENUMSTD:
+		err = get_v4l2_standard32(&karg.v2s, up);
+		compatible_arg = 0;
+		break;
+
+	case VIDIOCGWIN:
+	case VIDIOCGFBUF:
+	case VIDIOCGFREQ:
+	case VIDIOC_G_FBUF:
+	case VIDIOC_G_INPUT:
+		compatible_arg = 0;
+
 	if(err)
 		goto out;
 
-	set_fs(KERNEL_DS);
-	err = native_ioctl(file, cmd, (unsigned long)&karg);
-	set_fs(old_fs);
+	if(compatible_arg)
+		err = sys_ioctl(fd, cmd, (unsigned long)up);
+	else {
+		mm_segment_t old_fs = get_fs();
 
+		set_fs(KERNEL_DS);
+		err = sys_ioctl(fd, cmd, (unsigned long)&karg);
+		set_fs(old_fs);
+	}
 	if(err == 0) {
 		switch(cmd) {
 		case VIDIOCGTUNER:
@@ -250,7 +593,28 @@ static int do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg
 			err = put_video_buffer32(&karg.vb, up);
 			break;
 
+		case VIDIOC_G_FBUF:
+			err = put_v4l2_framebuffer32(&karg.v2fb, up);
+			break;
+
+		case VIDIOC_G_FMT:
+		case VIDIOC_S_FMT:
+		case VIDIOC_TRY_FMT:
+			err = put_v4l2_format32(&karg.v2f, 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 VIDIOCGFREQ:
+		case VIDIOC_G_INPUT:
 			err = put_user(((u32)karg.vx), (u32 __user *)up);
 			break;
 		};