linux/drivers/media/video/videodev.c

/*
 * Video capture interface for Linux version 2
 *
 *	A generic video device interface for the LINUX operating system
 *	using a set of device structures/vectors for low level operations.
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 * Authors:	Alan Cox, <alan@redhat.com> (version 1)
 *              Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
 *
 * Fixes:	20000516  Claudio Matsuoka <claudio@conectiva.com>
 *		- Added procfs support
 */

#define dbgarg(cmd, fmt, arg...) \
		if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {		\
			printk(KERN_DEBUG "%s: ",  vfd->name);		\
			v4l_printk_ioctl(cmd);				\
			printk(" " fmt,  ## arg);			\
		}

#define dbgarg2(fmt, arg...) \
		if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)			\
			printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/system.h>

#define __OLD_VIDIOC_ /* To allow fixing old calls*/
#include <linux/videodev2.h>

#ifdef CONFIG_VIDEO_V4L1
#include <linux/videodev.h>
#endif
#include <media/v4l2-common.h>
#include <linux/video_decoder.h>

#define VIDEO_NUM_DEVICES	256
#define VIDEO_NAME              "video4linux"

struct std_descr {
	v4l2_std_id std;
	const char *descr;
};

static const struct std_descr standards[] = {
	{ V4L2_STD_NTSC, 	"NTSC"      },
	{ V4L2_STD_NTSC_M, 	"NTSC-M"    },
	{ V4L2_STD_NTSC_M_JP, 	"NTSC-M-JP" },
	{ V4L2_STD_NTSC_M_KR,	"NTSC-M-KR" },
	{ V4L2_STD_NTSC_443, 	"NTSC-443"  },
	{ V4L2_STD_PAL, 	"PAL"       },
	{ V4L2_STD_PAL_BG, 	"PAL-BG"    },
	{ V4L2_STD_PAL_B, 	"PAL-B"     },
	{ V4L2_STD_PAL_B1, 	"PAL-B1"    },
	{ V4L2_STD_PAL_G, 	"PAL-G"     },
	{ V4L2_STD_PAL_H, 	"PAL-H"     },
	{ V4L2_STD_PAL_I, 	"PAL-I"     },
	{ V4L2_STD_PAL_DK, 	"PAL-DK"    },
	{ V4L2_STD_PAL_D, 	"PAL-D"     },
	{ V4L2_STD_PAL_D1, 	"PAL-D1"    },
	{ V4L2_STD_PAL_K, 	"PAL-K"     },
	{ V4L2_STD_PAL_M, 	"PAL-M"     },
	{ V4L2_STD_PAL_N, 	"PAL-N"     },
	{ V4L2_STD_PAL_Nc, 	"PAL-Nc"    },
	{ V4L2_STD_PAL_60, 	"PAL-60"    },
	{ V4L2_STD_SECAM, 	"SECAM"     },
	{ V4L2_STD_SECAM_B, 	"SECAM-B"   },
	{ V4L2_STD_SECAM_G, 	"SECAM-G"   },
	{ V4L2_STD_SECAM_H, 	"SECAM-H"   },
	{ V4L2_STD_SECAM_DK, 	"SECAM-DK"  },
	{ V4L2_STD_SECAM_D, 	"SECAM-D"   },
	{ V4L2_STD_SECAM_K, 	"SECAM-K"   },
	{ V4L2_STD_SECAM_K1, 	"SECAM-K1"  },
	{ V4L2_STD_SECAM_L, 	"SECAM-L"   },
	{ V4L2_STD_SECAM_LC, 	"SECAM-Lc"  },
	{ 0, 			"Unknown"   }
};

/* video4linux standard ID conversion to standard name
 */
const char *v4l2_norm_to_name(v4l2_std_id id)
{
	u32 myid = id;
	int i;

	/* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
	   64 bit comparations. So, on that architecture, with some gcc
	   variants, compilation fails. Currently, the max value is 30bit wide.
	 */
	BUG_ON(myid != id);

	for (i = 0; standards[i].std; i++)
		if (myid == standards[i].std)
			break;
	return standards[i].descr;
}
EXPORT_SYMBOL(v4l2_norm_to_name);

/* Fill in the fields of a v4l2_standard structure according to the
   'id' and 'transmission' parameters.  Returns negative on error.  */
int v4l2_video_std_construct(struct v4l2_standard *vs,
			     int id, const char *name)
{
	u32 index = vs->index;

	memset(vs, 0, sizeof(struct v4l2_standard));
	vs->index = index;
	vs->id    = id;
	if (id & V4L2_STD_525_60) {
		vs->frameperiod.numerator = 1001;
		vs->frameperiod.denominator = 30000;
		vs->framelines = 525;
	} else {
		vs->frameperiod.numerator = 1;
		vs->frameperiod.denominator = 25;
		vs->framelines = 625;
	}
	strlcpy(vs->name, name, sizeof(vs->name));
	return 0;
}
EXPORT_SYMBOL(v4l2_video_std_construct);

/* ----------------------------------------------------------------- */
/* some arrays for pretty-printing debug messages of enum types      */

char *v4l2_field_names[] = {
	[V4L2_FIELD_ANY]        = "any",
	[V4L2_FIELD_NONE]       = "none",
	[V4L2_FIELD_TOP]        = "top",
	[V4L2_FIELD_BOTTOM]     = "bottom",
	[V4L2_FIELD_INTERLACED] = "interlaced",
	[V4L2_FIELD_SEQ_TB]     = "seq-tb",
	[V4L2_FIELD_SEQ_BT]     = "seq-bt",
	[V4L2_FIELD_ALTERNATE]  = "alternate",
	[V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
	[V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
};
EXPORT_SYMBOL(v4l2_field_names);

char *v4l2_type_names[] = {
	[V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "video-cap",
	[V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "video-over",
	[V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "video-out",
	[V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
	[V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
	[V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
	[V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
	[V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "video-out-over",
};
EXPORT_SYMBOL(v4l2_type_names);

static char *v4l2_memory_names[] = {
	[V4L2_MEMORY_MMAP]    = "mmap",
	[V4L2_MEMORY_USERPTR] = "userptr",
	[V4L2_MEMORY_OVERLAY] = "overlay",
};

#define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \
			   arr[a] : "unknown")

/* ------------------------------------------------------------------ */
/* debug help functions                                               */

#ifdef CONFIG_VIDEO_V4L1_COMPAT
static const char *v4l1_ioctls[] = {
	[_IOC_NR(VIDIOCGCAP)]       = "VIDIOCGCAP",
	[_IOC_NR(VIDIOCGCHAN)]      = "VIDIOCGCHAN",
	[_IOC_NR(VIDIOCSCHAN)]      = "VIDIOCSCHAN",
	[_IOC_NR(VIDIOCGTUNER)]     = "VIDIOCGTUNER",
	[_IOC_NR(VIDIOCSTUNER)]     = "VIDIOCSTUNER",
	[_IOC_NR(VIDIOCGPICT)]      = "VIDIOCGPICT",
	[_IOC_NR(VIDIOCSPICT)]      = "VIDIOCSPICT",
	[_IOC_NR(VIDIOCCAPTURE)]    = "VIDIOCCAPTURE",
	[_IOC_NR(VIDIOCGWIN)]       = "VIDIOCGWIN",
	[_IOC_NR(VIDIOCSWIN)]       = "VIDIOCSWIN",
	[_IOC_NR(VIDIOCGFBUF)]      = "VIDIOCGFBUF",
	[_IOC_NR(VIDIOCSFBUF)]      = "VIDIOCSFBUF",
	[_IOC_NR(VIDIOCKEY)]        = "VIDIOCKEY",
	[_IOC_NR(VIDIOCGFREQ)]      = "VIDIOCGFREQ",
	[_IOC_NR(VIDIOCSFREQ)]      = "VIDIOCSFREQ",
	[_IOC_NR(VIDIOCGAUDIO)]     = "VIDIOCGAUDIO",
	[_IOC_NR(VIDIOCSAUDIO)]     = "VIDIOCSAUDIO",
	[_IOC_NR(VIDIOCSYNC)]       = "VIDIOCSYNC",
	[_IOC_NR(VIDIOCMCAPTURE)]   = "VIDIOCMCAPTURE",
	[_IOC_NR(VIDIOCGMBUF)]      = "VIDIOCGMBUF",
	[_IOC_NR(VIDIOCGUNIT)]      = "VIDIOCGUNIT",
	[_IOC_NR(VIDIOCGCAPTURE)]   = "VIDIOCGCAPTURE",
	[_IOC_NR(VIDIOCSCAPTURE)]   = "VIDIOCSCAPTURE",
	[_IOC_NR(VIDIOCSPLAYMODE)]  = "VIDIOCSPLAYMODE",
	[_IOC_NR(VIDIOCSWRITEMODE)] = "VIDIOCSWRITEMODE",
	[_IOC_NR(VIDIOCGPLAYINFO)]  = "VIDIOCGPLAYINFO",
	[_IOC_NR(VIDIOCSMICROCODE)] = "VIDIOCSMICROCODE",
	[_IOC_NR(VIDIOCGVBIFMT)]    = "VIDIOCGVBIFMT",
	[_IOC_NR(VIDIOCSVBIFMT)]    = "VIDIOCSVBIFMT"
};
#define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
#endif

static const char *v4l2_ioctls[] = {
	[_IOC_NR(VIDIOC_QUERYCAP)]         = "VIDIOC_QUERYCAP",
	[_IOC_NR(VIDIOC_RESERVED)]         = "VIDIOC_RESERVED",
	[_IOC_NR(VIDIOC_ENUM_FMT)]         = "VIDIOC_ENUM_FMT",
	[_IOC_NR(VIDIOC_G_FMT)]            = "VIDIOC_G_FMT",
	[_IOC_NR(VIDIOC_S_FMT)]            = "VIDIOC_S_FMT",
	[_IOC_NR(VIDIOC_REQBUFS)]          = "VIDIOC_REQBUFS",
	[_IOC_NR(VIDIOC_QUERYBUF)]         = "VIDIOC_QUERYBUF",
	[_IOC_NR(VIDIOC_G_FBUF)]           = "VIDIOC_G_FBUF",
	[_IOC_NR(VIDIOC_S_FBUF)]           = "VIDIOC_S_FBUF",
	[_IOC_NR(VIDIOC_OVERLAY)]          = "VIDIOC_OVERLAY",
	[_IOC_NR(VIDIOC_QBUF)]             = "VIDIOC_QBUF",
	[_IOC_NR(VIDIOC_DQBUF)]            = "VIDIOC_DQBUF",
	[_IOC_NR(VIDIOC_STREAMON)]         = "VIDIOC_STREAMON",
	[_IOC_NR(VIDIOC_STREAMOFF)]        = "VIDIOC_STREAMOFF",
	[_IOC_NR(VIDIOC_G_PARM)]           = "VIDIOC_G_PARM",
	[_IOC_NR(VIDIOC_S_PARM)]           = "VIDIOC_S_PARM",
	[_IOC_NR(VIDIOC_G_STD)]            = "VIDIOC_G_STD",
	[_IOC_NR(VIDIOC_S_STD)]            = "VIDIOC_S_STD",
	[_IOC_NR(VIDIOC_ENUMSTD)]          = "VIDIOC_ENUMSTD",
	[_IOC_NR(VIDIOC_ENUMINPUT)]        = "VIDIOC_ENUMINPUT",
	[_IOC_NR(VIDIOC_G_CTRL)]           = "VIDIOC_G_CTRL",
	[_IOC_NR(VIDIOC_S_CTRL)]           = "VIDIOC_S_CTRL",
	[_IOC_NR(VIDIOC_G_TUNER)]          = "VIDIOC_G_TUNER",
	[_IOC_NR(VIDIOC_S_TUNER)]          = "VIDIOC_S_TUNER",
	[_IOC_NR(VIDIOC_G_AUDIO)]          = "VIDIOC_G_AUDIO",
	[_IOC_NR(VIDIOC_S_AUDIO)]          = "VIDIOC_S_AUDIO",
	[_IOC_NR(VIDIOC_QUERYCTRL)]        = "VIDIOC_QUERYCTRL",
	[_IOC_NR(VIDIOC_QUERYMENU)]        = "VIDIOC_QUERYMENU",
	[_IOC_NR(VIDIOC_G_INPUT)]          = "VIDIOC_G_INPUT",
	[_IOC_NR(VIDIOC_S_INPUT)]          = "VIDIOC_S_INPUT",
	[_IOC_NR(VIDIOC_G_OUTPUT)]         = "VIDIOC_G_OUTPUT",
	[_IOC_NR(VIDIOC_S_OUTPUT)]         = "VIDIOC_S_OUTPUT",
	[_IOC_NR(VIDIOC_ENUMOUTPUT)]       = "VIDIOC_ENUMOUTPUT",
	[_IOC_NR(VIDIOC_G_AUDOUT)]         = "VIDIOC_G_AUDOUT",
	[_IOC_NR(VIDIOC_S_AUDOUT)]         = "VIDIOC_S_AUDOUT",
	[_IOC_NR(VIDIOC_G_MODULATOR)]      = "VIDIOC_G_MODULATOR",
	[_IOC_NR(VIDIOC_S_MODULATOR)]      = "VIDIOC_S_MODULATOR",
	[_IOC_NR(VIDIOC_G_FREQUENCY)]      = "VIDIOC_G_FREQUENCY",
	[_IOC_NR(VIDIOC_S_FREQUENCY)]      = "VIDIOC_S_FREQUENCY",
	[_IOC_NR(VIDIOC_CROPCAP)]          = "VIDIOC_CROPCAP",
	[_IOC_NR(VIDIOC_G_CROP)]           = "VIDIOC_G_CROP",
	[_IOC_NR(VIDIOC_S_CROP)]           = "VIDIOC_S_CROP",
	[_IOC_NR(VIDIOC_G_JPEGCOMP)]       = "VIDIOC_G_JPEGCOMP",
	[_IOC_NR(VIDIOC_S_JPEGCOMP)]       = "VIDIOC_S_JPEGCOMP",
	[_IOC_NR(VIDIOC_QUERYSTD)]         = "VIDIOC_QUERYSTD",
	[_IOC_NR(VIDIOC_TRY_FMT)]          = "VIDIOC_TRY_FMT",
	[_IOC_NR(VIDIOC_ENUMAUDIO)]        = "VIDIOC_ENUMAUDIO",
	[_IOC_NR(VIDIOC_ENUMAUDOUT)]       = "VIDIOC_ENUMAUDOUT",
	[_IOC_NR(VIDIOC_G_PRIORITY)]       = "VIDIOC_G_PRIORITY",
	[_IOC_NR(VIDIOC_S_PRIORITY)]       = "VIDIOC_S_PRIORITY",
	[_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP",
	[_IOC_NR(VIDIOC_LOG_STATUS)]       = "VIDIOC_LOG_STATUS",
	[_IOC_NR(VIDIOC_G_EXT_CTRLS)]      = "VIDIOC_G_EXT_CTRLS",
	[_IOC_NR(VIDIOC_S_EXT_CTRLS)]      = "VIDIOC_S_EXT_CTRLS",
	[_IOC_NR(VIDIOC_TRY_EXT_CTRLS)]    = "VIDIOC_TRY_EXT_CTRLS",
#if 1
	[_IOC_NR(VIDIOC_ENUM_FRAMESIZES)]  = "VIDIOC_ENUM_FRAMESIZES",
	[_IOC_NR(VIDIOC_ENUM_FRAMEINTERVALS)] = "VIDIOC_ENUM_FRAMEINTERVALS",
	[_IOC_NR(VIDIOC_G_ENC_INDEX)] 	   = "VIDIOC_G_ENC_INDEX",
	[_IOC_NR(VIDIOC_ENCODER_CMD)] 	   = "VIDIOC_ENCODER_CMD",
	[_IOC_NR(VIDIOC_TRY_ENCODER_CMD)]  = "VIDIOC_TRY_ENCODER_CMD",

	[_IOC_NR(VIDIOC_DBG_S_REGISTER)]   = "VIDIOC_DBG_S_REGISTER",
	[_IOC_NR(VIDIOC_DBG_G_REGISTER)]   = "VIDIOC_DBG_G_REGISTER",

	[_IOC_NR(VIDIOC_G_CHIP_IDENT)]     = "VIDIOC_G_CHIP_IDENT",
#endif
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)

static const char *v4l2_int_ioctls[] = {
#ifdef CONFIG_VIDEO_V4L1_COMPAT
	[_IOC_NR(DECODER_GET_CAPABILITIES)]    = "DECODER_GET_CAPABILITIES",
	[_IOC_NR(DECODER_GET_STATUS)]          = "DECODER_GET_STATUS",
	[_IOC_NR(DECODER_SET_NORM)]            = "DECODER_SET_NORM",
	[_IOC_NR(DECODER_SET_INPUT)]           = "DECODER_SET_INPUT",
	[_IOC_NR(DECODER_SET_OUTPUT)]          = "DECODER_SET_OUTPUT",
	[_IOC_NR(DECODER_ENABLE_OUTPUT)]       = "DECODER_ENABLE_OUTPUT",
	[_IOC_NR(DECODER_SET_PICTURE)]         = "DECODER_SET_PICTURE",
	[_IOC_NR(DECODER_SET_GPIO)]            = "DECODER_SET_GPIO",
	[_IOC_NR(DECODER_INIT)]                = "DECODER_INIT",
	[_IOC_NR(DECODER_SET_VBI_BYPASS)]      = "DECODER_SET_VBI_BYPASS",
	[_IOC_NR(DECODER_DUMP)]                = "DECODER_DUMP",
#endif
	[_IOC_NR(AUDC_SET_RADIO)]              = "AUDC_SET_RADIO",

	[_IOC_NR(TUNER_SET_TYPE_ADDR)]         = "TUNER_SET_TYPE_ADDR",
	[_IOC_NR(TUNER_SET_STANDBY)]           = "TUNER_SET_STANDBY",
	[_IOC_NR(TUNER_SET_CONFIG)]            = "TUNER_SET_CONFIG",

	[_IOC_NR(VIDIOC_INT_S_TUNER_MODE)]     = "VIDIOC_INT_S_TUNER_MODE",
	[_IOC_NR(VIDIOC_INT_RESET)]            = "VIDIOC_INT_RESET",
	[_IOC_NR(VIDIOC_INT_AUDIO_CLOCK_FREQ)] = "VIDIOC_INT_AUDIO_CLOCK_FREQ",
	[_IOC_NR(VIDIOC_INT_DECODE_VBI_LINE)]  = "VIDIOC_INT_DECODE_VBI_LINE",
	[_IOC_NR(VIDIOC_INT_S_VBI_DATA)]       = "VIDIOC_INT_S_VBI_DATA",
	[_IOC_NR(VIDIOC_INT_G_VBI_DATA)]       = "VIDIOC_INT_G_VBI_DATA",
	[_IOC_NR(VIDIOC_INT_I2S_CLOCK_FREQ)]   = "VIDIOC_INT_I2S_CLOCK_FREQ",
	[_IOC_NR(VIDIOC_INT_S_STANDBY)]        = "VIDIOC_INT_S_STANDBY",
	[_IOC_NR(VIDIOC_INT_S_AUDIO_ROUTING)]  = "VIDIOC_INT_S_AUDIO_ROUTING",
	[_IOC_NR(VIDIOC_INT_G_AUDIO_ROUTING)]  = "VIDIOC_INT_G_AUDIO_ROUTING",
	[_IOC_NR(VIDIOC_INT_S_VIDEO_ROUTING)]  = "VIDIOC_INT_S_VIDEO_ROUTING",
	[_IOC_NR(VIDIOC_INT_G_VIDEO_ROUTING)]  = "VIDIOC_INT_G_VIDEO_ROUTING",
	[_IOC_NR(VIDIOC_INT_S_CRYSTAL_FREQ)]   = "VIDIOC_INT_S_CRYSTAL_FREQ",
	[_IOC_NR(VIDIOC_INT_INIT)]   	       = "VIDIOC_INT_INIT",
	[_IOC_NR(VIDIOC_INT_G_STD_OUTPUT)]     = "VIDIOC_INT_G_STD_OUTPUT",
	[_IOC_NR(VIDIOC_INT_S_STD_OUTPUT)]     = "VIDIOC_INT_S_STD_OUTPUT",
};
#define V4L2_INT_IOCTLS ARRAY_SIZE(v4l2_int_ioctls)

/* Common ioctl debug function. This function can be used by
   external ioctl messages as well as internal V4L ioctl */
void v4l_printk_ioctl(unsigned int cmd)
{
	char *dir, *type;

	switch (_IOC_TYPE(cmd)) {
	case 'd':
		if (_IOC_NR(cmd) >= V4L2_INT_IOCTLS) {
			type = "v4l2_int";
			break;
		}
		printk("%s", v4l2_int_ioctls[_IOC_NR(cmd)]);
		return;
#ifdef CONFIG_VIDEO_V4L1_COMPAT
	case 'v':
		if (_IOC_NR(cmd) >= V4L1_IOCTLS) {
			type = "v4l1";
			break;
		}
		printk("%s", v4l1_ioctls[_IOC_NR(cmd)]);
		return;
#endif
	case 'V':
		if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
			type = "v4l2";
			break;
		}
		printk("%s", v4l2_ioctls[_IOC_NR(cmd)]);
		return;
	default:
		type = "unknown";
	}

	switch (_IOC_DIR(cmd)) {
	case _IOC_NONE:              dir = "--"; break;
	case _IOC_READ:              dir = "r-"; break;
	case _IOC_WRITE:             dir = "-w"; break;
	case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
	default:                     dir = "*ERR*"; break;
	}
	printk("%s ioctl '%c', dir=%s, #%d (0x%08x)",
		type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
}
EXPORT_SYMBOL(v4l_printk_ioctl);

/*
 *	sysfs stuff
 */

static ssize_t show_name(struct device *cd,
			 struct device_attribute *attr, char *buf)
{
	struct video_device *vfd = container_of(cd, struct video_device,
						class_dev);
	return sprintf(buf, "%.*s\n", (int)sizeof(vfd->name), vfd->name);
}

struct video_device *video_device_alloc(void)
{
	struct video_device *vfd;

	vfd = kzalloc(sizeof(*vfd),GFP_KERNEL);
	return vfd;
}
EXPORT_SYMBOL(video_device_alloc);

void video_device_release(struct video_device *vfd)
{
	kfree(vfd);
}
EXPORT_SYMBOL(video_device_release);

static void video_release(struct device *cd)
{
	struct video_device *vfd = container_of(cd, struct video_device,
								class_dev);

#if 1
	/* needed until all drivers are fixed */
	if (!vfd->release)
		return;
#endif
	vfd->release(vfd);
}

static struct device_attribute video_device_attrs[] = {
	__ATTR(name, S_IRUGO, show_name, NULL),
	__ATTR_NULL
};

static struct class video_class = {
	.name    = VIDEO_NAME,
	.dev_attrs = video_device_attrs,
	.dev_release = video_release,
};

/*
 *	Active devices
 */

static struct video_device *video_device[VIDEO_NUM_DEVICES];
static DEFINE_MUTEX(videodev_lock);

struct video_device* video_devdata(struct file *file)
{
	return video_device[iminor(file->f_path.dentry->d_inode)];
}
EXPORT_SYMBOL(video_devdata);

/*
 *	Open a video device - FIXME: Obsoleted
 */
static int video_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	int err = 0;
	struct video_device *vfl;
	const struct file_operations *old_fops;

	if(minor>=VIDEO_NUM_DEVICES)
		return -ENODEV;
	lock_kernel();
	mutex_lock(&videodev_lock);
	vfl=video_device[minor];
	if(vfl==NULL) {
		mutex_unlock(&videodev_lock);
		request_module("char-major-%d-%d", VIDEO_MAJOR, minor);
		mutex_lock(&videodev_lock);
		vfl=video_device[minor];
		if (vfl==NULL) {
			mutex_unlock(&videodev_lock);
			unlock_kernel();
			return -ENODEV;
		}
	}
	old_fops = file->f_op;
	file->f_op = fops_get(vfl->fops);
	if(file->f_op->open)
		err = file->f_op->open(inode,file);
	if (err) {
		fops_put(file->f_op);
		file->f_op = fops_get(old_fops);
	}
	fops_put(old_fops);
	mutex_unlock(&videodev_lock);
	unlock_kernel();
	return err;
}

/*
 * helper function -- handles userspace copying for ioctl arguments
 */

#ifdef __OLD_VIDIOC_
static unsigned int
video_fix_command(unsigned int cmd)
{
	switch (cmd) {
	case VIDIOC_OVERLAY_OLD:
		cmd = VIDIOC_OVERLAY;
		break;
	case VIDIOC_S_PARM_OLD:
		cmd = VIDIOC_S_PARM;
		break;
	case VIDIOC_S_CTRL_OLD:
		cmd = VIDIOC_S_CTRL;
		break;
	case VIDIOC_G_AUDIO_OLD:
		cmd = VIDIOC_G_AUDIO;
		break;
	case VIDIOC_G_AUDOUT_OLD:
		cmd = VIDIOC_G_AUDOUT;
		break;
	case VIDIOC_CROPCAP_OLD:
		cmd = VIDIOC_CROPCAP;
		break;
	}
	return cmd;
}
#endif

/*
 * Obsolete usercopy function - Should be removed soon
 */
int
video_usercopy(struct inode *inode, struct file *file,
	       unsigned int cmd, unsigned long arg,
	       int (*func)(struct inode *inode, struct file *file,
			   unsigned int cmd, void *arg))
{
	char	sbuf[128];
	void    *mbuf = NULL;
	void	*parg = NULL;
	int	err  = -EINVAL;
	int     is_ext_ctrl;
	size_t  ctrls_size = 0;
	void __user *user_ptr = NULL;

#ifdef __OLD_VIDIOC_
	cmd = video_fix_command(cmd);
#endif
	is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
		       cmd == VIDIOC_TRY_EXT_CTRLS);

	/*  Copy arguments into temp kernel buffer  */
	switch (_IOC_DIR(cmd)) {
	case _IOC_NONE:
		parg = NULL;
		break;
	case _IOC_READ:
	case _IOC_WRITE:
	case (_IOC_WRITE | _IOC_READ):
		if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
			parg = sbuf;
		} else {
			/* too big to allocate from stack */
			mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
			if (NULL == mbuf)
				return -ENOMEM;
			parg = mbuf;
		}

		err = -EFAULT;
		if (_IOC_DIR(cmd) & _IOC_WRITE)
			if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
				goto out;
		break;
	}
	if (is_ext_ctrl) {
		struct v4l2_ext_controls *p = parg;

		/* In case of an error, tell the caller that it wasn't
		   a specific control that caused it. */
		p->error_idx = p->count;
		user_ptr = (void __user *)p->controls;
		if (p->count) {
			ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
			/* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
			mbuf = kmalloc(ctrls_size, GFP_KERNEL);
			err = -ENOMEM;
			if (NULL == mbuf)
				goto out_ext_ctrl;
			err = -EFAULT;
			if (copy_from_user(mbuf, user_ptr, ctrls_size))
				goto out_ext_ctrl;
			p->controls = mbuf;
		}
	}

	/* call driver */
	err = func(inode, file, cmd, parg);
	if (err == -ENOIOCTLCMD)
		err = -EINVAL;
	if (is_ext_ctrl) {
		struct v4l2_ext_controls *p = parg;

		p->controls = (void *)user_ptr;
		if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
			err = -EFAULT;
		goto out_ext_ctrl;
	}
	if (err < 0)
		goto out;

out_ext_ctrl:
	/*  Copy results into user buffer  */
	switch (_IOC_DIR(cmd))
	{
	case _IOC_READ:
	case (_IOC_WRITE | _IOC_READ):
		if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
			err = -EFAULT;
		break;
	}

out:
	kfree(mbuf);
	return err;
}
EXPORT_SYMBOL(video_usercopy);

/*
 * open/release helper functions -- handle exclusive opens
 * Should be removed soon
 */
int video_exclusive_open(struct inode *inode, struct file *file)
{
	struct  video_device *vfl = video_devdata(file);
	int retval = 0;

	mutex_lock(&vfl->lock);
	if (vfl->users) {
		retval = -EBUSY;
	} else {
		vfl->users++;
	}
	mutex_unlock(&vfl->lock);
	return retval;
}
EXPORT_SYMBOL(video_exclusive_open);

int video_exclusive_release(struct inode *inode, struct file *file)
{
	struct  video_device *vfl = video_devdata(file);

	vfl->users--;
	return 0;
}
EXPORT_SYMBOL(video_exclusive_release);

static void dbgbuf(unsigned int cmd, struct video_device *vfd,
					struct v4l2_buffer *p)
{
	struct v4l2_timecode *tc=&p->timecode;

	dbgarg (cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, "
		"bytesused=%d, flags=0x%08d, "
		"field=%0d, sequence=%d, memory=%s, offset/userptr=0x%08lx, length=%d\n",
			(p->timestamp.tv_sec/3600),
			(int)(p->timestamp.tv_sec/60)%60,
			(int)(p->timestamp.tv_sec%60),
			p->timestamp.tv_usec,
			p->index,
			prt_names(p->type, v4l2_type_names),
			p->bytesused, p->flags,
			p->field, p->sequence,
			prt_names(p->memory, v4l2_memory_names),
			p->m.userptr, p->length);
	dbgarg2 ("timecode= %02d:%02d:%02d type=%d, "
		"flags=0x%08d, frames=%d, userbits=0x%08x\n",
			tc->hours,tc->minutes,tc->seconds,
			tc->type, tc->flags, tc->frames, *(__u32 *) tc->userbits);
}

static inline void dbgrect(struct video_device *vfd, char *s,
							struct v4l2_rect *r)
{
	dbgarg2 ("%sRect start at %dx%d, size= %dx%d\n", s, r->left, r->top,
						r->width, r->height);
};

static inline void v4l_print_pix_fmt (struct video_device *vfd,
						struct v4l2_pix_format *fmt)
{
	dbgarg2 ("width=%d, height=%d, format=%c%c%c%c, field=%s, "
		"bytesperline=%d sizeimage=%d, colorspace=%d\n",
		fmt->width,fmt->height,
		(fmt->pixelformat & 0xff),
		(fmt->pixelformat >>  8) & 0xff,
		(fmt->pixelformat >> 16) & 0xff,
		(fmt->pixelformat >> 24) & 0xff,
		prt_names(fmt->field, v4l2_field_names),
		fmt->bytesperline, fmt->sizeimage, fmt->colorspace);
};


static int check_fmt (struct video_device *vfd, enum v4l2_buf_type type)
{
	switch (type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		if (vfd->vidioc_try_fmt_cap)
			return (0);
		break;
	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
		if (vfd->vidioc_try_fmt_overlay)
			return (0);
		break;
	case V4L2_BUF_TYPE_VBI_CAPTURE:
		if (vfd->vidioc_try_fmt_vbi)
			return (0);
		break;
	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
		if (vfd->vidioc_try_fmt_vbi_output)
			return (0);
		break;
	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
		if (vfd->vidioc_try_fmt_vbi_capture)
			return (0);
		break;
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		if (vfd->vidioc_try_fmt_video_output)
			return (0);
		break;
	case V4L2_BUF_TYPE_VBI_OUTPUT:
		if (vfd->vidioc_try_fmt_vbi_output)
			return (0);
		break;
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
		if (vfd->vidioc_try_fmt_output_overlay)
			return (0);
		break;
	case V4L2_BUF_TYPE_PRIVATE:
		if (vfd->vidioc_try_fmt_type_private)
			return (0);
		break;
	}
	return (-EINVAL);
}

static int __video_do_ioctl(struct inode *inode, struct file *file,
		unsigned int cmd, void *arg)
{
	struct video_device *vfd = video_devdata(file);
	void                 *fh = file->private_data;
	int                  ret = -EINVAL;

	if ( (vfd->debug & V4L2_DEBUG_IOCTL) &&
				!(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) {
		v4l_print_ioctl(vfd->name, cmd);
		printk("\n");
	}

#ifdef CONFIG_VIDEO_V4L1_COMPAT
	/***********************************************************
	 Handles calls to the obsoleted V4L1 API
	 Due to the nature of VIDIOCGMBUF, each driver that supports
	 V4L1 should implement its own handler for this ioctl.
	 ***********************************************************/

	/* --- streaming capture ------------------------------------- */
	if (cmd == VIDIOCGMBUF) {
		struct video_mbuf *p=arg;

		memset(p, 0, sizeof(*p));

		if (!vfd->vidiocgmbuf)
			return ret;
		ret=vfd->vidiocgmbuf(file, fh, p);
		if (!ret)
			dbgarg (cmd, "size=%d, frames=%d, offsets=0x%08lx\n",
						p->size, p->frames,
						(unsigned long)p->offsets);
		return ret;
	}

	/********************************************************
	 All other V4L1 calls are handled by v4l1_compat module.
	 Those calls will be translated into V4L2 calls, and
	 __video_do_ioctl will be called again, with one or more
	 V4L2 ioctls.
	 ********************************************************/
	if (_IOC_TYPE(cmd)=='v')
		return v4l_compat_translate_ioctl(inode,file,cmd,arg,
						__video_do_ioctl);
#endif

	switch(cmd) {
	/* --- capabilities ------------------------------------------ */
	case VIDIOC_QUERYCAP:
	{
		struct v4l2_capability *cap = (struct v4l2_capability*)arg;
		memset(cap, 0, sizeof(*cap));

		if (!vfd->vidioc_querycap)
			break;

		ret=vfd->vidioc_querycap(file, fh, cap);
		if (!ret)
			dbgarg (cmd, "driver=%s, card=%s, bus=%s, "
					"version=0x%08x, "
					"capabilities=0x%08x\n",
					cap->driver,cap->card,cap->bus_info,
					cap->version,
					cap->capabilities);
		break;
	}

	/* --- priority ------------------------------------------ */
	case VIDIOC_G_PRIORITY:
	{
		enum v4l2_priority *p=arg;

		if (!vfd->vidioc_g_priority)
			break;
		ret=vfd->vidioc_g_priority(file, fh, p);
		if (!ret)
			dbgarg(cmd, "priority is %d\n", *p);
		break;
	}
	case VIDIOC_S_PRIORITY:
	{
		enum v4l2_priority *p=arg;

		if (!vfd->vidioc_s_priority)
			break;
		dbgarg(cmd, "setting priority to %d\n", *p);
		ret=vfd->vidioc_s_priority(file, fh, *p);
		break;
	}

	/* --- capture ioctls ---------------------------------------- */
	case VIDIOC_ENUM_FMT:
	{
		struct v4l2_fmtdesc *f = arg;
		enum v4l2_buf_type type;
		unsigned int index;

		index = f->index;
		type  = f->type;
		memset(f,0,sizeof(*f));
		f->index = index;
		f->type  = type;

		switch (type) {
		case V4L2_BUF_TYPE_VIDEO_CAPTURE:
			if (vfd->vidioc_enum_fmt_cap)
				ret=vfd->vidioc_enum_fmt_cap(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OVERLAY:
			if (vfd->vidioc_enum_fmt_overlay)
				ret=vfd->vidioc_enum_fmt_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_CAPTURE:
			if (vfd->vidioc_enum_fmt_vbi)
				ret=vfd->vidioc_enum_fmt_vbi(file, fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
			if (vfd->vidioc_enum_fmt_vbi_output)
				ret=vfd->vidioc_enum_fmt_vbi_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
			if (vfd->vidioc_enum_fmt_vbi_capture)
				ret=vfd->vidioc_enum_fmt_vbi_capture(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT:
			if (vfd->vidioc_enum_fmt_video_output)
				ret=vfd->vidioc_enum_fmt_video_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_OUTPUT:
			if (vfd->vidioc_enum_fmt_vbi_output)
				ret=vfd->vidioc_enum_fmt_vbi_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
			if (vfd->vidioc_enum_fmt_output_overlay)
				ret=vfd->vidioc_enum_fmt_output_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_PRIVATE:
			if (vfd->vidioc_enum_fmt_type_private)
				ret=vfd->vidioc_enum_fmt_type_private(file,
								fh, f);
			break;
		}
		if (!ret)
			dbgarg (cmd, "index=%d, type=%d, flags=%d, "
					"pixelformat=%c%c%c%c, description='%s'\n",
					f->index, f->type, f->flags,
					(f->pixelformat & 0xff),
					(f->pixelformat >>  8) & 0xff,
					(f->pixelformat >> 16) & 0xff,
					(f->pixelformat >> 24) & 0xff,
					f->description);
		break;
	}
	case VIDIOC_G_FMT:
	{
		struct v4l2_format *f = (struct v4l2_format *)arg;
		enum v4l2_buf_type type=f->type;

		memset(&f->fmt.pix,0,sizeof(f->fmt.pix));
		f->type=type;

		/* FIXME: Should be one dump per type */
		dbgarg (cmd, "type=%s\n", prt_names(type,
					v4l2_type_names));

		switch (type) {
		case V4L2_BUF_TYPE_VIDEO_CAPTURE:
			if (vfd->vidioc_g_fmt_cap)
				ret=vfd->vidioc_g_fmt_cap(file, fh, f);
			if (!ret)
				v4l_print_pix_fmt(vfd,&f->fmt.pix);
			break;
		case V4L2_BUF_TYPE_VIDEO_OVERLAY:
			if (vfd->vidioc_g_fmt_overlay)
				ret=vfd->vidioc_g_fmt_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_CAPTURE:
			if (vfd->vidioc_g_fmt_vbi)
				ret=vfd->vidioc_g_fmt_vbi(file, fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
			if (vfd->vidioc_g_fmt_vbi_output)
				ret=vfd->vidioc_g_fmt_vbi_output(file, fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
			if (vfd->vidioc_g_fmt_vbi_capture)
				ret=vfd->vidioc_g_fmt_vbi_capture(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT:
			if (vfd->vidioc_g_fmt_video_output)
				ret=vfd->vidioc_g_fmt_video_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
			if (vfd->vidioc_g_fmt_output_overlay)
				ret=vfd->vidioc_g_fmt_output_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_OUTPUT:
			if (vfd->vidioc_g_fmt_vbi_output)
				ret=vfd->vidioc_g_fmt_vbi_output(file, fh, f);
			break;
		case V4L2_BUF_TYPE_PRIVATE:
			if (vfd->vidioc_g_fmt_type_private)
				ret=vfd->vidioc_g_fmt_type_private(file,
								fh, f);
			break;
		}

		break;
	}
	case VIDIOC_S_FMT:
	{
		struct v4l2_format *f = (struct v4l2_format *)arg;

		/* FIXME: Should be one dump per type */
		dbgarg (cmd, "type=%s\n", prt_names(f->type,
					v4l2_type_names));

		switch (f->type) {
		case V4L2_BUF_TYPE_VIDEO_CAPTURE:
			v4l_print_pix_fmt(vfd,&f->fmt.pix);
			if (vfd->vidioc_s_fmt_cap)
				ret=vfd->vidioc_s_fmt_cap(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OVERLAY:
			if (vfd->vidioc_s_fmt_overlay)
				ret=vfd->vidioc_s_fmt_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_CAPTURE:
			if (vfd->vidioc_s_fmt_vbi)
				ret=vfd->vidioc_s_fmt_vbi(file, fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
			if (vfd->vidioc_s_fmt_vbi_output)
				ret=vfd->vidioc_s_fmt_vbi_output(file, fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
			if (vfd->vidioc_s_fmt_vbi_capture)
				ret=vfd->vidioc_s_fmt_vbi_capture(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT:
			if (vfd->vidioc_s_fmt_video_output)
				ret=vfd->vidioc_s_fmt_video_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
			if (vfd->vidioc_s_fmt_output_overlay)
				ret=vfd->vidioc_s_fmt_output_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_OUTPUT:
			if (vfd->vidioc_s_fmt_vbi_output)
				ret=vfd->vidioc_s_fmt_vbi_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_PRIVATE:
			if (vfd->vidioc_s_fmt_type_private)
				ret=vfd->vidioc_s_fmt_type_private(file,
								fh, f);
			break;
		}
		break;
	}
	case VIDIOC_TRY_FMT:
	{
		struct v4l2_format *f = (struct v4l2_format *)arg;

		/* FIXME: Should be one dump per type */
		dbgarg (cmd, "type=%s\n", prt_names(f->type,
						v4l2_type_names));
		switch (f->type) {
		case V4L2_BUF_TYPE_VIDEO_CAPTURE:
			if (vfd->vidioc_try_fmt_cap)
				ret=vfd->vidioc_try_fmt_cap(file, fh, f);
			if (!ret)
				v4l_print_pix_fmt(vfd,&f->fmt.pix);
			break;
		case V4L2_BUF_TYPE_VIDEO_OVERLAY:
			if (vfd->vidioc_try_fmt_overlay)
				ret=vfd->vidioc_try_fmt_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_CAPTURE:
			if (vfd->vidioc_try_fmt_vbi)
				ret=vfd->vidioc_try_fmt_vbi(file, fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
			if (vfd->vidioc_try_fmt_vbi_output)
				ret=vfd->vidioc_try_fmt_vbi_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
			if (vfd->vidioc_try_fmt_vbi_capture)
				ret=vfd->vidioc_try_fmt_vbi_capture(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT:
			if (vfd->vidioc_try_fmt_video_output)
				ret=vfd->vidioc_try_fmt_video_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
			if (vfd->vidioc_try_fmt_output_overlay)
				ret=vfd->vidioc_try_fmt_output_overlay(file, fh, f);
			break;
		case V4L2_BUF_TYPE_VBI_OUTPUT:
			if (vfd->vidioc_try_fmt_vbi_output)
				ret=vfd->vidioc_try_fmt_vbi_output(file,
								fh, f);
			break;
		case V4L2_BUF_TYPE_PRIVATE:
			if (vfd->vidioc_try_fmt_type_private)
				ret=vfd->vidioc_try_fmt_type_private(file,
								fh, f);
			break;
		}

		break;
	}
	/* FIXME: Those buf reqs could be handled here,
	   with some changes on videobuf to allow its header to be included at
	   videodev2.h or being merged at videodev2.
	 */
	case VIDIOC_REQBUFS:
	{
		struct v4l2_requestbuffers *p=arg;

		if (!vfd->vidioc_reqbufs)
			break;
		ret = check_fmt (vfd, p->type);
		if (ret)
			break;

		ret=vfd->vidioc_reqbufs(file, fh, p);
		dbgarg (cmd, "count=%d, type=%s, memory=%s\n",
				p->count,
				prt_names(p->type, v4l2_type_names),
				prt_names(p->memory, v4l2_memory_names));
		break;
	}
	case VIDIOC_QUERYBUF:
	{
		struct v4l2_buffer *p=arg;

		if (!vfd->vidioc_querybuf)
			break;
		ret = check_fmt (vfd, p->type);
		if (ret)
			break;

		ret=vfd->vidioc_querybuf(file, fh, p);
		if (!ret)
			dbgbuf(cmd,vfd,p);
		break;
	}
	case VIDIOC_QBUF:
	{
		struct v4l2_buffer *p=arg;

		if (!vfd->vidioc_qbuf)
			break;
		ret = check_fmt (vfd, p->type);
		if (ret)
			break;

		ret=vfd->vidioc_qbuf(file, fh, p);
		if (!ret)
			dbgbuf(cmd,vfd,p);
		break;
	}
	case VIDIOC_DQBUF:
	{
		struct v4l2_buffer *p=arg;
		if (!vfd->vidioc_dqbuf)
			break;
		ret = check_fmt (vfd, p->type);
		if (ret)
			break;

		ret=vfd->vidioc_dqbuf(file, fh, p);
		if (!ret)
			dbgbuf(cmd,vfd,p);
		break;
	}
	case VIDIOC_OVERLAY:
	{
		int *i = arg;

		if (!vfd->vidioc_overlay)
			break;
		dbgarg (cmd, "value=%d\n",*i);
		ret=vfd->vidioc_overlay(file, fh, *i);
		break;
	}
	case VIDIOC_G_FBUF:
	{
		struct v4l2_framebuffer *p=arg;
		if (!vfd->vidioc_g_fbuf)
			break;
		ret=vfd->vidioc_g_fbuf(file, fh, arg);
		if (!ret) {
			dbgarg (cmd, "capability=%d, flags=%d, base=0x%08lx\n",
					p->capability,p->flags,
					(unsigned long)p->base);
			v4l_print_pix_fmt (vfd, &p->fmt);
		}
		break;
	}
	case VIDIOC_S_FBUF:
	{
		struct v4l2_framebuffer *p=arg;
		if (!vfd->vidioc_s_fbuf)
			break;

		dbgarg (cmd, "capability=%d, flags=%d, base=0x%08lx\n",
				p->capability,p->flags,(unsigned long)p->base);
		v4l_print_pix_fmt (vfd, &p->fmt);
		ret=vfd->vidioc_s_fbuf(file, fh, arg);

		break;
	}
	case VIDIOC_STREAMON:
	{
		enum v4l2_buf_type i = *(int *)arg;
		if (!vfd->vidioc_streamon)
			break;
		dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
		ret=vfd->vidioc_streamon(file, fh,i);
		break;
	}
	case VIDIOC_STREAMOFF:
	{
		enum v4l2_buf_type i = *(int *)arg;

		if (!vfd->vidioc_streamoff)
			break;
		dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
		ret=vfd->vidioc_streamoff(file, fh, i);
		break;
	}
	/* ---------- tv norms ---------- */
	case VIDIOC_ENUMSTD:
	{
		struct v4l2_standard *p = arg;
		v4l2_std_id id = vfd->tvnorms, curr_id = 0;
		unsigned int index = p->index, i, j = 0;
		const char *descr = "";

		/* Return norm array in a canonical way */
		for (i = 0; i <= index && id; i++) {
			/* last std value in the standards array is 0, so this
			   while always ends there since (id & 0) == 0. */
			while ((id & standards[j].std) != standards[j].std)
				j++;
			curr_id = standards[j].std;
			descr = standards[j].descr;
			j++;
			if (curr_id == 0)
				break;
			if (curr_id != V4L2_STD_PAL &&
			    curr_id != V4L2_STD_SECAM &&
			    curr_id != V4L2_STD_NTSC)
				id &= ~curr_id;
		}
		if (i <= index)
			return -EINVAL;

		v4l2_video_std_construct(p, curr_id, descr);
		p->index = index;

		dbgarg(cmd, "index=%d, id=%Ld, name=%s, fps=%d/%d, "
				"framelines=%d\n", p->index,
				(unsigned long long)p->id, p->name,
				p->frameperiod.numerator,
				p->frameperiod.denominator,
				p->framelines);

		ret = 0;
		break;
	}
	case VIDIOC_G_STD:
	{
		v4l2_std_id *id = arg;

		*id = vfd->current_norm;

		dbgarg (cmd, "value=%08Lx\n", (long long unsigned) *id);

		ret=0;
		break;
	}
	case VIDIOC_S_STD:
	{
		v4l2_std_id *id = arg,norm;

		dbgarg (cmd, "value=%08Lx\n", (long long unsigned) *id);

		norm = (*id) & vfd->tvnorms;
		if ( vfd->tvnorms && !norm)	/* Check if std is supported */
			break;

		/* Calls the specific handler */
		if (vfd->vidioc_s_std)
			ret=vfd->vidioc_s_std(file, fh, &norm);
		else
			ret=-EINVAL;

		/* Updates standard information */
		if (ret>=0)
			vfd->current_norm=norm;

		break;
	}
	case VIDIOC_QUERYSTD:
	{
		v4l2_std_id *p=arg;

		if (!vfd->vidioc_querystd)
			break;
		ret=vfd->vidioc_querystd(file, fh, arg);
		if (!ret)
			dbgarg (cmd, "detected std=%08Lx\n",
						(unsigned long long)*p);
		break;
	}
	/* ------ input switching ---------- */
	/* FIXME: Inputs can be handled inside videodev2 */
	case VIDIOC_ENUMINPUT:
	{
		struct v4l2_input *p=arg;
		int i=p->index;

		if (!vfd->vidioc_enum_input)
			break;
		memset(p, 0, sizeof(*p));
		p->index=i;

		ret=vfd->vidioc_enum_input(file, fh, p);
		if (!ret)
			dbgarg (cmd, "index=%d, name=%s, type=%d, "
					"audioset=%d, "
					"tuner=%d, std=%08Lx, status=%d\n",
					p->index,p->name,p->type,p->audioset,
					p->tuner,
					(unsigned long long)p->std,
					p->status);
		break;
	}
	case VIDIOC_G_INPUT:
	{
		unsigned int *i = arg;

		if (!vfd->vidioc_g_input)
			break;
		ret=vfd->vidioc_g_input(file, fh, i);
		if (!ret)
			dbgarg (cmd, "value=%d\n",*i);
		break;
	}
	case VIDIOC_S_INPUT:
	{
		unsigned int *i = arg;

		if (!vfd->vidioc_s_input)
			break;
		dbgarg (cmd, "value=%d\n",*i);
		ret=vfd->vidioc_s_input(file, fh, *i);
		break;
	}

	/* ------ output switching ---------- */
	case VIDIOC_G_OUTPUT:
	{
		unsigned int *i = arg;

		if (!vfd->vidioc_g_output)
			break;
		ret=vfd->vidioc_g_output(file, fh, i);
		if (!ret)
			dbgarg (cmd, "value=%d\n",*i);
		break;
	}
	case VIDIOC_S_OUTPUT:
	{
		unsigned int *i = arg;

		if (!vfd->vidioc_s_output)
			break;
		dbgarg (cmd, "value=%d\n",*i);
		ret=vfd->vidioc_s_output(file, fh, *i);
		break;
	}

	/* --- controls ---------------------------------------------- */
	case VIDIOC_QUERYCTRL:
	{
		struct v4l2_queryctrl *p=arg;

		if (!vfd->vidioc_queryctrl)
			break;
		ret=vfd->vidioc_queryctrl(file, fh, p);

		if (!ret)
			dbgarg (cmd, "id=%d, type=%d, name=%s, "
					"min/max=%d/%d,"
					" step=%d, default=%d, flags=0x%08x\n",
					p->id,p->type,p->name,p->minimum,
					p->maximum,p->step,p->default_value,
					p->flags);
		break;
	}
	case VIDIOC_G_CTRL:
	{
		struct v4l2_control *p = arg;

		if (!vfd->vidioc_g_ctrl)
			break;
		dbgarg(cmd, "Enum for index=%d\n", p->id);

		ret=vfd->vidioc_g_ctrl(file, fh, p);
		if (!ret)
			dbgarg2 ( "id=%d, value=%d\n", p->id, p->value);
		break;
	}
	case VIDIOC_S_CTRL:
	{
		struct v4l2_control *p = arg;

		if (!vfd->vidioc_s_ctrl)
			break;
		dbgarg (cmd, "id=%d, value=%d\n", p->id, p->value);

		ret=vfd->vidioc_s_ctrl(file, fh, p);
		break;
	}
	case VIDIOC_G_EXT_CTRLS:
	{
		struct v4l2_ext_controls *p = arg;

		if (vfd->vidioc_g_ext_ctrls) {
			dbgarg(cmd, "count=%d\n", p->count);

			ret=vfd->vidioc_g_ext_ctrls(file, fh, p);
		}
		break;
	}
	case VIDIOC_S_EXT_CTRLS:
	{
		struct v4l2_ext_controls *p = arg;

		if (vfd->vidioc_s_ext_ctrls) {
			dbgarg(cmd, "count=%d\n", p->count);

			ret=vfd->vidioc_s_ext_ctrls(file, fh, p);
		}
		break;
	}
	case VIDIOC_TRY_EXT_CTRLS:
	{
		struct v4l2_ext_controls *p = arg;

		if (vfd->vidioc_try_ext_ctrls) {
			dbgarg(cmd, "count=%d\n", p->count);

			ret=vfd->vidioc_try_ext_ctrls(file, fh, p);
		}
		break;
	}
	case VIDIOC_QUERYMENU:
	{
		struct v4l2_querymenu *p=arg;
		if (!vfd->vidioc_querymenu)
			break;
		ret=vfd->vidioc_querymenu(file, fh, p);
		if (!ret)
			dbgarg (cmd, "id=%d, index=%d, name=%s\n",
						p->id,p->index,p->name);
		break;
	}
	/* --- audio ---------------------------------------------- */
	case VIDIOC_ENUMAUDIO:
	{
		struct v4l2_audio *p=arg;

		if (!vfd->vidioc_enumaudio)
			break;
		dbgarg(cmd, "Enum for index=%d\n", p->index);
		ret=vfd->vidioc_enumaudio(file, fh, p);
		if (!ret)
			dbgarg2("index=%d, name=%s, capability=%d, "
					"mode=%d\n",p->index,p->name,
					p->capability, p->mode);
		break;
	}
	case VIDIOC_G_AUDIO:
	{
		struct v4l2_audio *p=arg;
		__u32 index=p->index;

		if (!vfd->vidioc_g_audio)
			break;

		memset(p,0,sizeof(*p));
		p->index=index;
		dbgarg(cmd, "Get for index=%d\n", p->index);
		ret=vfd->vidioc_g_audio(file, fh, p);
		if (!ret)
			dbgarg2("index=%d, name=%s, capability=%d, "
					"mode=%d\n",p->index,
					p->name,p->capability, p->mode);
		break;
	}
	case VIDIOC_S_AUDIO:
	{
		struct v4l2_audio *p=arg;

		if (!vfd->vidioc_s_audio)
			break;
		dbgarg(cmd, "index=%d, name=%s, capability=%d, "
					"mode=%d\n", p->index, p->name,
					p->capability, p->mode);
		ret=vfd->vidioc_s_audio(file, fh, p);
		break;
	}
	case VIDIOC_ENUMAUDOUT:
	{
		struct v4l2_audioout *p=arg;

		if (!vfd->vidioc_enumaudout)
			break;
		dbgarg(cmd, "Enum for index=%d\n", p->index);
		ret=vfd->vidioc_enumaudout(file, fh, p);
		if (!ret)
			dbgarg2("index=%d, name=%s, capability=%d, "
					"mode=%d\n", p->index, p->name,
					p->capability,p->mode);
		break;
	}
	case VIDIOC_G_AUDOUT:
	{
		struct v4l2_audioout *p=arg;

		if (!vfd->vidioc_g_audout)
			break;
		dbgarg(cmd, "Enum for index=%d\n", p->index);
		ret=vfd->vidioc_g_audout(file, fh, p);
		if (!ret)
			dbgarg2("index=%d, name=%s, capability=%d, "
					"mode=%d\n", p->index, p->name,
					p->capability,p->mode);
		break;
	}
	case VIDIOC_S_AUDOUT:
	{
		struct v4l2_audioout *p=arg;

		if (!vfd->vidioc_s_audout)
			break;
		dbgarg(cmd, "index=%d, name=%s, capability=%d, "
					"mode=%d\n", p->index, p->name,
					p->capability,p->mode);

		ret=vfd->vidioc_s_audout(file, fh, p);
		break;
	}
	case VIDIOC_G_MODULATOR:
	{
		struct v4l2_modulator *p=arg;
		if (!vfd->vidioc_g_modulator)
			break;
		ret=vfd->vidioc_g_modulator(file, fh, p);
		if (!ret)
			dbgarg(cmd, "index=%d, name=%s, "
					"capability=%d, rangelow=%d,"
					" rangehigh=%d, txsubchans=%d\n",
					p->index, p->name,p->capability,
					p->rangelow, p->rangehigh,
					p->txsubchans);
		break;
	}
	case VIDIOC_S_MODULATOR:
	{
		struct v4l2_modulator *p=arg;
		if (!vfd->vidioc_s_modulator)
			break;
		dbgarg(cmd, "index=%d, name=%s, capability=%d, "
				"rangelow=%d, rangehigh=%d, txsubchans=%d\n",
				p->index, p->name,p->capability,p->rangelow,
				p->rangehigh,p->txsubchans);
			ret=vfd->vidioc_s_modulator(file, fh, p);
		break;
	}
	case VIDIOC_G_CROP:
	{
		struct v4l2_crop *p=arg;
		if (!vfd->vidioc_g_crop)
			break;
		ret=vfd->vidioc_g_crop(file, fh, p);
		if (!ret) {
			dbgarg(cmd, "type=%d\n", p->type);
			dbgrect(vfd, "", &p->c);
		}
		break;
	}
	case VIDIOC_S_CROP:
	{
		struct v4l2_crop *p=arg;
		if (!vfd->vidioc_s_crop)
			break;
		dbgarg(cmd, "type=%d\n", p->type);
		dbgrect(vfd, "", &p->c);
		ret=vfd->vidioc_s_crop(file, fh, p);
		break;
	}
	case VIDIOC_CROPCAP:
	{
		struct v4l2_cropcap *p=arg;
		/*FIXME: Should also show v4l2_fract pixelaspect */
		if (!vfd->vidioc_cropcap)
			break;
		dbgarg(cmd, "type=%d\n", p->type);
		dbgrect(vfd, "bounds ", &p->bounds);
		dbgrect(vfd, "defrect ", &p->defrect);
		ret=vfd->vidioc_cropcap(file, fh, p);
		break;
	}
	case VIDIOC_G_JPEGCOMP:
	{
		struct v4l2_jpegcompression *p=arg;
		if (!vfd->vidioc_g_jpegcomp)
			break;
		ret=vfd->vidioc_g_jpegcomp(file, fh, p);
		if (!ret)
			dbgarg (cmd, "quality=%d, APPn=%d, "
						"APP_len=%d, COM_len=%d, "
						"jpeg_markers=%d\n",
						p->quality,p->APPn,p->APP_len,
						p->COM_len,p->jpeg_markers);
		break;
	}
	case VIDIOC_S_JPEGCOMP:
	{
		struct v4l2_jpegcompression *p=arg;
		if (!vfd->vidioc_g_jpegcomp)
			break;
		dbgarg (cmd, "quality=%d, APPn=%d, APP_len=%d, "
					"COM_len=%d, jpeg_markers=%d\n",
					p->quality,p->APPn,p->APP_len,
					p->COM_len,p->jpeg_markers);
			ret=vfd->vidioc_s_jpegcomp(file, fh, p);
		break;
	}
	case VIDIOC_G_ENC_INDEX:
	{
		struct v4l2_enc_idx *p=arg;

		if (!vfd->vidioc_g_enc_index)
			break;
		ret=vfd->vidioc_g_enc_index(file, fh, p);
		if (!ret)
			dbgarg (cmd, "entries=%d, entries_cap=%d\n",
					p->entries,p->entries_cap);
		break;
	}
	case VIDIOC_ENCODER_CMD:
	{
		struct v4l2_encoder_cmd *p=arg;

		if (!vfd->vidioc_encoder_cmd)
			break;
		ret=vfd->vidioc_encoder_cmd(file, fh, p);
		if (!ret)
			dbgarg (cmd, "cmd=%d, flags=%d\n",
					p->cmd,p->flags);
		break;
	}
	case VIDIOC_TRY_ENCODER_CMD:
	{
		struct v4l2_encoder_cmd *p=arg;

		if (!vfd->vidioc_try_encoder_cmd)
			break;
		ret=vfd->vidioc_try_encoder_cmd(file, fh, p);
		if (!ret)
			dbgarg (cmd, "cmd=%d, flags=%d\n",
					p->cmd,p->flags);
		break;
	}
	case VIDIOC_G_PARM:
	{
		struct v4l2_streamparm *p=arg;
		__u32 type=p->type;

		memset(p,0,sizeof(*p));
		p->type=type;

		if (vfd->vidioc_g_parm) {
			ret=vfd->vidioc_g_parm(file, fh, p);
		} else {
			struct v4l2_standard s;

			if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
				return -EINVAL;

			v4l2_video_std_construct(&s, vfd->current_norm,
						 v4l2_norm_to_name(vfd->current_norm));

			p->parm.capture.timeperframe = s.frameperiod;
			ret=0;
		}

		dbgarg (cmd, "type=%d\n", p->type);
		break;
	}
	case VIDIOC_S_PARM:
	{
		struct v4l2_streamparm *p=arg;
		if (!vfd->vidioc_s_parm)
			break;
		dbgarg (cmd, "type=%d\n", p->type);
		ret=vfd->vidioc_s_parm(file, fh, p);
		break;
	}
	case VIDIOC_G_TUNER:
	{
		struct v4l2_tuner *p=arg;
		__u32 index=p->index;

		if (!vfd->vidioc_g_tuner)
			break;

		memset(p,0,sizeof(*p));
		p->index=index;

		ret=vfd->vidioc_g_tuner(file, fh, p);
		if (!ret)
			dbgarg (cmd, "index=%d, name=%s, type=%d, "
					"capability=%d, rangelow=%d, "
					"rangehigh=%d, signal=%d, afc=%d, "
					"rxsubchans=%d, audmode=%d\n",
					p->index, p->name, p->type,
					p->capability, p->rangelow,
					p->rangehigh, p->rxsubchans,
					p->audmode, p->signal, p->afc);
		break;
	}
	case VIDIOC_S_TUNER:
	{
		struct v4l2_tuner *p=arg;
		if (!vfd->vidioc_s_tuner)
			break;
		dbgarg (cmd, "index=%d, name=%s, type=%d, "
				"capability=%d, rangelow=%d, rangehigh=%d, "
				"signal=%d, afc=%d, rxsubchans=%d, "
				"audmode=%d\n",p->index, p->name, p->type,
				p->capability, p->rangelow,p->rangehigh,
				p->rxsubchans, p->audmode, p->signal,
				p->afc);
		ret=vfd->vidioc_s_tuner(file, fh, p);
		break;
	}
	case VIDIOC_G_FREQUENCY:
	{
		struct v4l2_frequency *p=arg;
		if (!vfd->vidioc_g_frequency)
			break;

		memset(p,0,sizeof(*p));

		ret=vfd->vidioc_g_frequency(file, fh, p);
		if (!ret)
			dbgarg (cmd, "tuner=%d, type=%d, frequency=%d\n",
						p->tuner,p->type,p->frequency);
		break;
	}
	case VIDIOC_S_FREQUENCY:
	{
		struct v4l2_frequency *p=arg;
		if (!vfd->vidioc_s_frequency)
			break;
		dbgarg (cmd, "tuner=%d, type=%d, frequency=%d\n",
				p->tuner,p->type,p->frequency);
		ret=vfd->vidioc_s_frequency(file, fh, p);
		break;
	}
	case VIDIOC_G_SLICED_VBI_CAP:
	{
		struct v4l2_sliced_vbi_cap *p=arg;
		if (!vfd->vidioc_g_sliced_vbi_cap)
			break;
		ret=vfd->vidioc_g_sliced_vbi_cap(file, fh, p);
		if (!ret)
			dbgarg (cmd, "service_set=%d\n", p->service_set);
		break;
	}
	case VIDIOC_LOG_STATUS:
	{
		if (!vfd->vidioc_log_status)
			break;
		ret=vfd->vidioc_log_status(file, fh);
		break;
	}
#ifdef CONFIG_VIDEO_ADV_DEBUG
	case VIDIOC_DBG_G_REGISTER:
	{
		struct v4l2_register *p=arg;
		if (!capable(CAP_SYS_ADMIN))
			ret=-EPERM;
		else if (vfd->vidioc_g_register)
			ret=vfd->vidioc_g_register(file, fh, p);
		break;
	}
	case VIDIOC_DBG_S_REGISTER:
	{
		struct v4l2_register *p=arg;
		if (!capable(CAP_SYS_ADMIN))
			ret=-EPERM;
		else if (vfd->vidioc_s_register)
			ret=vfd->vidioc_s_register(file, fh, p);
		break;
	}
#endif
	case VIDIOC_G_CHIP_IDENT:
	{
		struct v4l2_chip_ident *p=arg;
		if (!vfd->vidioc_g_chip_ident)
			break;
		ret=vfd->vidioc_g_chip_ident(file, fh, p);
		if (!ret)
			dbgarg (cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
		break;
	}
	default:
	{
		if (!vfd->vidioc_default)
			break;
		ret = vfd->vidioc_default(file, fh, cmd, arg);
		break;
	}
	} /* switch */

	if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
		if (ret<0) {
			printk("%s: err: on ", vfd->name);
			v4l_print_ioctl(vfd->name, cmd);
			printk("\n");
		}
	}

	return ret;
}

int video_ioctl2 (struct inode *inode, struct file *file,
	       unsigned int cmd, unsigned long arg)
{
	char	sbuf[128];
	void    *mbuf = NULL;
	void	*parg = NULL;
	int	err  = -EINVAL;
	int     is_ext_ctrl;
	size_t  ctrls_size = 0;
	void __user *user_ptr = NULL;

#ifdef __OLD_VIDIOC_
	cmd = video_fix_command(cmd);
#endif
	is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
		       cmd == VIDIOC_TRY_EXT_CTRLS);

	/*  Copy arguments into temp kernel buffer  */
	switch (_IOC_DIR(cmd)) {
	case _IOC_NONE:
		parg = NULL;
		break;
	case _IOC_READ:
	case _IOC_WRITE:
	case (_IOC_WRITE | _IOC_READ):
		if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
			parg = sbuf;
		} else {
			/* too big to allocate from stack */
			mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
			if (NULL == mbuf)
				return -ENOMEM;
			parg = mbuf;
		}

		err = -EFAULT;
		if (_IOC_DIR(cmd) & _IOC_WRITE)
			if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
				goto out;
		break;
	}

	if (is_ext_ctrl) {
		struct v4l2_ext_controls *p = parg;

		/* In case of an error, tell the caller that it wasn't
		   a specific control that caused it. */
		p->error_idx = p->count;
		user_ptr = (void __user *)p->controls;
		if (p->count) {
			ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
			/* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
			mbuf = kmalloc(ctrls_size, GFP_KERNEL);
			err = -ENOMEM;
			if (NULL == mbuf)
				goto out_ext_ctrl;
			err = -EFAULT;
			if (copy_from_user(mbuf, user_ptr, ctrls_size))
				goto out_ext_ctrl;
			p->controls = mbuf;
		}
	}

	/* Handles IOCTL */
	err = __video_do_ioctl(inode, file, cmd, parg);
	if (err == -ENOIOCTLCMD)
		err = -EINVAL;
	if (is_ext_ctrl) {
		struct v4l2_ext_controls *p = parg;

		p->controls = (void *)user_ptr;
		if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
			err = -EFAULT;
		goto out_ext_ctrl;
	}
	if (err < 0)
		goto out;

out_ext_ctrl:
	/*  Copy results into user buffer  */
	switch (_IOC_DIR(cmd))
	{
	case _IOC_READ:
	case (_IOC_WRITE | _IOC_READ):
		if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
			err = -EFAULT;
		break;
	}

out:
	kfree(mbuf);
	return err;
}
EXPORT_SYMBOL(video_ioctl2);

static const struct file_operations video_fops;

/**
 *	video_register_device - register video4linux devices
 *	@vfd:  video device structure we want to register
 *	@type: type of device to register
 *	@nr:   which device number (0 == /dev/video0, 1 == /dev/video1, ...
 *             -1 == first free)
 *
 *	The registration code assigns minor numbers based on the type
 *	requested. -ENFILE is returned in all the device slots for this
 *	category are full. If not then the minor field is set and the
 *	driver initialize function is called (if non %NULL).
 *
 *	Zero is returned on success.
 *
 *	Valid types are
 *
 *	%VFL_TYPE_GRABBER - A frame grabber
 *
 *	%VFL_TYPE_VTX - A teletext device
 *
 *	%VFL_TYPE_VBI - Vertical blank data (undecoded)
 *
 *	%VFL_TYPE_RADIO - A radio card
 */

int video_register_device(struct video_device *vfd, int type, int nr)
{
	int i=0;
	int base;
	int end;
	int ret;
	char *name_base;

	switch(type)
	{
		case VFL_TYPE_GRABBER:
			base=MINOR_VFL_TYPE_GRABBER_MIN;
			end=MINOR_VFL_TYPE_GRABBER_MAX+1;
			name_base = "video";
			break;
		case VFL_TYPE_VTX:
			base=MINOR_VFL_TYPE_VTX_MIN;
			end=MINOR_VFL_TYPE_VTX_MAX+1;
			name_base = "vtx";
			break;
		case VFL_TYPE_VBI:
			base=MINOR_VFL_TYPE_VBI_MIN;
			end=MINOR_VFL_TYPE_VBI_MAX+1;
			name_base = "vbi";
			break;
		case VFL_TYPE_RADIO:
			base=MINOR_VFL_TYPE_RADIO_MIN;
			end=MINOR_VFL_TYPE_RADIO_MAX+1;
			name_base = "radio";
			break;
		default:
			printk(KERN_ERR "%s called with unknown type: %d\n",
			       __func__, type);
			return -1;
	}

	/* pick a minor number */
	mutex_lock(&videodev_lock);
	if (nr >= 0  &&  nr < end-base) {
		/* use the one the driver asked for */
		i = base+nr;
		if (NULL != video_device[i]) {
			mutex_unlock(&videodev_lock);
			return -ENFILE;
		}
	} else {
		/* use first free */
		for(i=base;i<end;i++)
			if (NULL == video_device[i])
				break;
		if (i == end) {
			mutex_unlock(&videodev_lock);
			return -ENFILE;
		}
	}
	video_device[i]=vfd;
	vfd->minor=i;
	mutex_unlock(&videodev_lock);
	mutex_init(&vfd->lock);

	/* sysfs class */
	memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev));
	if (vfd->dev)
		vfd->class_dev.parent = vfd->dev;
	vfd->class_dev.class       = &video_class;
	vfd->class_dev.devt        = MKDEV(VIDEO_MAJOR, vfd->minor);
	sprintf(vfd->class_dev.bus_id, "%s%d", name_base, i - base);
	ret = device_register(&vfd->class_dev);
	if (ret < 0) {
		printk(KERN_ERR "%s: device_register failed\n",
		       __func__);
		goto fail_minor;
	}

#if 1
	/* needed until all drivers are fixed */
	if (!vfd->release)
		printk(KERN_WARNING "videodev: \"%s\" has no release callback. "
		       "Please fix your driver for proper sysfs support, see "
		       "http://lwn.net/Articles/36850/\n", vfd->name);
#endif
	return 0;

fail_minor:
	mutex_lock(&videodev_lock);
	video_device[vfd->minor] = NULL;
	vfd->minor = -1;
	mutex_unlock(&videodev_lock);
	return ret;
}
EXPORT_SYMBOL(video_register_device);

/**
 *	video_unregister_device - unregister a video4linux device
 *	@vfd: the device to unregister
 *
 *	This unregisters the passed device and deassigns the minor
 *	number. Future open calls will be met with errors.
 */

void video_unregister_device(struct video_device *vfd)
{
	mutex_lock(&videodev_lock);
	if(video_device[vfd->minor]!=vfd)
		panic("videodev: bad unregister");

	video_device[vfd->minor]=NULL;
	device_unregister(&vfd->class_dev);
	mutex_unlock(&videodev_lock);
}
EXPORT_SYMBOL(video_unregister_device);

/*
 * Video fs operations
 */
static const struct file_operations video_fops=
{
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.open		= video_open,
};

/*
 *	Initialise video for linux
 */

static int __init videodev_init(void)
{
	int ret;

	printk(KERN_INFO "Linux video capture interface: v2.00\n");
	if (register_chrdev(VIDEO_MAJOR, VIDEO_NAME, &video_fops)) {
		printk(KERN_WARNING "video_dev: unable to get major %d\n", VIDEO_MAJOR);
		return -EIO;
	}

	ret = class_register(&video_class);
	if (ret < 0) {
		unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
		printk(KERN_WARNING "video_dev: class_register failed\n");
		return -EIO;
	}

	return 0;
}

static void __exit videodev_exit(void)
{
	class_unregister(&video_class);
	unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
}

module_init(videodev_init)
module_exit(videodev_exit)

MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2");
MODULE_LICENSE("GPL");


/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */