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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 (KERN_DEBUG "%s: " fmt, vfd->name, ## 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 <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>

#define VIDEO_NUM_DEVICES     256
#define VIDEO_NAME              "video4linux"

/*
 *    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;
}

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

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)];
}

/*
 *    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;
      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);
                  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);
      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;
}

/*
 * 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;
}

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

      vfl->users--;
      return 0;
}

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


/* FIXME: Those stuff are replicated also on v4l2-common.c */
static char *v4l2_type_names_FIXME[] = {
      [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_OUTPUT]  = "sliced-vbi-out",
      [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-capture",
      [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "video-out-over",
      [V4L2_BUF_TYPE_PRIVATE]            = "private",
};

static char *v4l2_field_names_FIXME[] = {
      [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",
};

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

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_FIXME),
                  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_FIXME),
            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);
      }

#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_FIXME));

            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_FIXME));

            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_FIXME));
            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_FIXME),
                        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_FIXME));
            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_FIXME));
            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;

            if (index<0) {
                  ret=-EINVAL;
                  break;
            }

            /* Return norm array on a canonical way */
            for (i=0;i<= index && id; i++) {
                  if ( (id & V4L2_STD_PAL) == V4L2_STD_PAL) {
                        curr_id = V4L2_STD_PAL;
                  } else if ( (id & V4L2_STD_PAL_BG) == V4L2_STD_PAL_BG) {
                        curr_id = V4L2_STD_PAL_BG;
                  } else if ( (id & V4L2_STD_PAL_DK) == V4L2_STD_PAL_DK) {
                        curr_id = V4L2_STD_PAL_DK;
                  } else if ( (id & V4L2_STD_PAL_B) == V4L2_STD_PAL_B) {
                        curr_id = V4L2_STD_PAL_B;
                  } else if ( (id & V4L2_STD_PAL_B1) == V4L2_STD_PAL_B1) {
                        curr_id = V4L2_STD_PAL_B1;
                  } else if ( (id & V4L2_STD_PAL_G) == V4L2_STD_PAL_G) {
                        curr_id = V4L2_STD_PAL_G;
                  } else if ( (id & V4L2_STD_PAL_H) == V4L2_STD_PAL_H) {
                        curr_id = V4L2_STD_PAL_H;
                  } else if ( (id & V4L2_STD_PAL_I) == V4L2_STD_PAL_I) {
                        curr_id = V4L2_STD_PAL_I;
                  } else if ( (id & V4L2_STD_PAL_D) == V4L2_STD_PAL_D) {
                        curr_id = V4L2_STD_PAL_D;
                  } else if ( (id & V4L2_STD_PAL_D1) == V4L2_STD_PAL_D1) {
                        curr_id = V4L2_STD_PAL_D1;
                  } else if ( (id & V4L2_STD_PAL_K) == V4L2_STD_PAL_K) {
                        curr_id = V4L2_STD_PAL_K;
                  } else if ( (id & V4L2_STD_PAL_M) == V4L2_STD_PAL_M) {
                        curr_id = V4L2_STD_PAL_M;
                  } else if ( (id & V4L2_STD_PAL_N) == V4L2_STD_PAL_N) {
                        curr_id = V4L2_STD_PAL_N;
                  } else if ( (id & V4L2_STD_PAL_Nc) == V4L2_STD_PAL_Nc) {
                        curr_id = V4L2_STD_PAL_Nc;
                  } else if ( (id & V4L2_STD_PAL_60) == V4L2_STD_PAL_60) {
                        curr_id = V4L2_STD_PAL_60;
                  } else if ( (id & V4L2_STD_NTSC) == V4L2_STD_NTSC) {
                        curr_id = V4L2_STD_NTSC;
                  } else if ( (id & V4L2_STD_NTSC_M) == V4L2_STD_NTSC_M) {
                        curr_id = V4L2_STD_NTSC_M;
                  } else if ( (id & V4L2_STD_NTSC_M_JP) == V4L2_STD_NTSC_M_JP) {
                        curr_id = V4L2_STD_NTSC_M_JP;
                  } else if ( (id & V4L2_STD_NTSC_443) == V4L2_STD_NTSC_443) {
                        curr_id = V4L2_STD_NTSC_443;
                  } else if ( (id & V4L2_STD_NTSC_M_KR) == V4L2_STD_NTSC_M_KR) {
                        curr_id = V4L2_STD_NTSC_M_KR;
                  } else if ( (id & V4L2_STD_SECAM) == V4L2_STD_SECAM) {
                        curr_id = V4L2_STD_SECAM;
                  } else if ( (id & V4L2_STD_SECAM_DK) == V4L2_STD_SECAM_DK) {
                        curr_id = V4L2_STD_SECAM_DK;
                  } else if ( (id & V4L2_STD_SECAM_B) == V4L2_STD_SECAM_B) {
                        curr_id = V4L2_STD_SECAM_B;
                  } else if ( (id & V4L2_STD_SECAM_D) == V4L2_STD_SECAM_D) {
                        curr_id = V4L2_STD_SECAM_D;
                  } else if ( (id & V4L2_STD_SECAM_G) == V4L2_STD_SECAM_G) {
                        curr_id = V4L2_STD_SECAM_G;
                  } else if ( (id & V4L2_STD_SECAM_H) == V4L2_STD_SECAM_H) {
                        curr_id = V4L2_STD_SECAM_H;
                  } else if ( (id & V4L2_STD_SECAM_K) == V4L2_STD_SECAM_K) {
                        curr_id = V4L2_STD_SECAM_K;
                  } else if ( (id & V4L2_STD_SECAM_K1) == V4L2_STD_SECAM_K1) {
                        curr_id = V4L2_STD_SECAM_K1;
                  } else if ( (id & V4L2_STD_SECAM_L) == V4L2_STD_SECAM_L) {
                        curr_id = V4L2_STD_SECAM_L;
                  } else if ( (id & V4L2_STD_SECAM_LC) == V4L2_STD_SECAM_LC) {
                        curr_id = V4L2_STD_SECAM_LC;
                  } else {
                        break;
                  }
                  id &= ~curr_id;
            }
            if (i<=index)
                  return -EINVAL;

            v4l2_video_std_construct(p, curr_id,v4l2_norm_to_name(curr_id));
            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=%Lu\n", (long long unsigned) *id);

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

            dbgarg (cmd, "value=%Lu\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=%Lu\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=%Ld, 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;
      }
      } /* switch */

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

      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;
}


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",
                         __FUNCTION__, 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",
                   __FUNCTION__);
            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;
}

/**
 *    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);
}

/*
 * 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)

EXPORT_SYMBOL(video_register_device);
EXPORT_SYMBOL(video_unregister_device);
EXPORT_SYMBOL(video_devdata);
EXPORT_SYMBOL(video_usercopy);
EXPORT_SYMBOL(video_exclusive_open);
EXPORT_SYMBOL(video_exclusive_release);
EXPORT_SYMBOL(video_ioctl2);
EXPORT_SYMBOL(video_device_alloc);
EXPORT_SYMBOL(video_device_release);

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:
 */

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