/*
   * Video capture interface for Linux version 2
   *
   * A generic framework to process V4L2 ioctl commands.
   *
   * 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@lxorguk.ukuu.org.uk> (version 1)

   *              Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
   */
  
  #include <linux/module.h>

  #include <linux/slab.h>

  #include <linux/types.h>
  #include <linux/kernel.h>

  #include <linux/version.h>

  #include <linux/videodev2.h>

  #include <media/v4l2-common.h>
  #include <media/v4l2-ioctl.h>

  #include <media/v4l2-ctrls.h>

  #include <media/v4l2-fh.h>
  #include <media/v4l2-event.h>

  #include <media/v4l2-device.h>

  #include <media/v4l2-chip-ident.h>

  
  #define dbgarg(cmd, fmt, arg...) \
  		do {							\
  		    if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {		\
  			printk(KERN_DEBUG "%s: ",  vfd->name);		\
  			v4l_printk_ioctl(cmd);				\
  			printk(" " fmt,  ## arg);			\
  		    }							\
  		} while (0)
  
  #define dbgarg2(fmt, arg...) \
  		do {							\
  		    if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)		\
  			printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\
  		} while (0)

  #define dbgarg3(fmt, arg...) \
  		do {							\
  		    if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)		\
  			printk(KERN_CONT "%s: " fmt, vfd->name, ## arg);\
  		} while (0)

  /* Zero out the end of the struct pointed to by p.  Everything after, but

   * not including, the specified field is cleared. */
  #define CLEAR_AFTER_FIELD(p, field) \
  	memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
  	0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))

  #define have_fmt_ops(foo) (						\

  	ops->vidioc_##foo##_fmt_vid_cap ||				\
  	ops->vidioc_##foo##_fmt_vid_out ||				\
  	ops->vidioc_##foo##_fmt_vid_cap_mplane ||			\
  	ops->vidioc_##foo##_fmt_vid_out_mplane ||			\
  	ops->vidioc_##foo##_fmt_vid_overlay ||				\

  	ops->vidioc_##foo##_fmt_vbi_cap ||				\
  	ops->vidioc_##foo##_fmt_vid_out_overlay ||			\
  	ops->vidioc_##foo##_fmt_vbi_out ||				\
  	ops->vidioc_##foo##_fmt_sliced_vbi_cap ||			\
  	ops->vidioc_##foo##_fmt_sliced_vbi_out ||			\
  	ops->vidioc_##foo##_fmt_type_private)

  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);

  /* Returns frame period for the given standard */
  void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
  {
  	if (id & V4L2_STD_525_60) {
  		frameperiod->numerator = 1001;
  		frameperiod->denominator = 30000;
  	} else {
  		frameperiod->numerator = 1;
  		frameperiod->denominator = 25;
  	}
  }
  EXPORT_SYMBOL(v4l2_video_std_frame_period);

  /* 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)
  {

  	vs->id = id;
  	v4l2_video_std_frame_period(id, &vs->frameperiod);
  	vs->framelines = (id & V4L2_STD_525_60) ? 525 : 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      */
  
  const 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);
  
  const char *v4l2_type_names[] = {
  	[V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
  	[V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
  	[V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-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] = "vid-out-overlay",

  	[V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE] = "vid-cap-mplane",
  	[V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE] = "vid-out-mplane",

  };
  EXPORT_SYMBOL(v4l2_type_names);
  
  static const 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                                               */

  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_SELECTION)]      = "VIDIOC_G_SELECTION",
  	[_IOC_NR(VIDIOC_S_SELECTION)]      = "VIDIOC_S_SELECTION",

  	[_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_DBG_G_CHIP_IDENT)] = "VIDIOC_DBG_G_CHIP_IDENT",

  	[_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)]   = "VIDIOC_S_HW_FREQ_SEEK",
  #endif

  	[_IOC_NR(VIDIOC_ENUM_DV_PRESETS)]  = "VIDIOC_ENUM_DV_PRESETS",
  	[_IOC_NR(VIDIOC_S_DV_PRESET)]	   = "VIDIOC_S_DV_PRESET",
  	[_IOC_NR(VIDIOC_G_DV_PRESET)]	   = "VIDIOC_G_DV_PRESET",
  	[_IOC_NR(VIDIOC_QUERY_DV_PRESET)]  = "VIDIOC_QUERY_DV_PRESET",
  	[_IOC_NR(VIDIOC_S_DV_TIMINGS)]     = "VIDIOC_S_DV_TIMINGS",
  	[_IOC_NR(VIDIOC_G_DV_TIMINGS)]     = "VIDIOC_G_DV_TIMINGS",

  	[_IOC_NR(VIDIOC_DQEVENT)]	   = "VIDIOC_DQEVENT",
  	[_IOC_NR(VIDIOC_SUBSCRIBE_EVENT)]  = "VIDIOC_SUBSCRIBE_EVENT",
  	[_IOC_NR(VIDIOC_UNSUBSCRIBE_EVENT)] = "VIDIOC_UNSUBSCRIBE_EVENT",

  	[_IOC_NR(VIDIOC_CREATE_BUFS)]      = "VIDIOC_CREATE_BUFS",
  	[_IOC_NR(VIDIOC_PREPARE_BUF)]      = "VIDIOC_PREPARE_BUF",

  };
  #define V4L2_IOCTLS ARRAY_SIZE(v4l2_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':

  		type = "v4l2_int";
  		break;

  	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);

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

  	struct v4l2_plane *plane;
  	int i;

  
  	dbgarg(cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, "

  		"flags=0x%08d, field=%0d, sequence=%d, memory=%s
  ",

  			p->timestamp.tv_sec / 3600,
  			(int)(p->timestamp.tv_sec / 60) % 60,
  			(int)(p->timestamp.tv_sec % 60),

  			(long)p->timestamp.tv_usec,

  			p->index,
  			prt_names(p->type, v4l2_type_names),

  			p->flags, p->field, p->sequence,
  			prt_names(p->memory, v4l2_memory_names));
  
  	if (V4L2_TYPE_IS_MULTIPLANAR(p->type) && p->m.planes) {
  		for (i = 0; i < p->length; ++i) {
  			plane = &p->m.planes[i];
  			dbgarg2("plane %d: bytesused=%d, data_offset=0x%08x "
  				"offset/userptr=0x%08lx, length=%d
  ",
  				i, plane->bytesused, plane->data_offset,
  				plane->m.userptr, plane->length);
  		}
  	} else {
  		dbgarg2("bytesused=%d, offset/userptr=0x%08lx, length=%d
  ",
  			p->bytesused, p->m.userptr, p->length);
  	}

  	dbgarg2("timecode=%02d:%02d:%02d type=%d, "
  		"flags=0x%08d, frames=%d, userbits=0x%08x
  ",
  			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
  ", 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
  ",
  		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 inline void v4l_print_pix_fmt_mplane(struct video_device *vfd,
  					    struct v4l2_pix_format_mplane *fmt)
  {
  	int i;
  
  	dbgarg2("width=%d, height=%d, format=%c%c%c%c, field=%s, "
  		"colorspace=%d, num_planes=%d
  ",
  		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->colorspace, fmt->num_planes);
  
  	for (i = 0; i < fmt->num_planes; ++i)
  		dbgarg2("plane %d: bytesperline=%d sizeimage=%d
  ", i,
  			fmt->plane_fmt[i].bytesperline,
  			fmt->plane_fmt[i].sizeimage);
  }

  static inline void v4l_print_ext_ctrls(unsigned int cmd,
  	struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals)
  {
  	__u32 i;
  
  	if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG))
  		return;
  	dbgarg(cmd, "");
  	printk(KERN_CONT "class=0x%x", c->ctrl_class);
  	for (i = 0; i < c->count; i++) {

  		if (show_vals && !c->controls[i].size)

  			printk(KERN_CONT " id/val=0x%x/0x%x",
  				c->controls[i].id, c->controls[i].value);
  		else

  			printk(KERN_CONT " id=0x%x,size=%u",
  				c->controls[i].id, c->controls[i].size);

  	}
  	printk(KERN_CONT "
  ");
  };
  
  static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
  {
  	__u32 i;
  
  	/* zero the reserved fields */
  	c->reserved[0] = c->reserved[1] = 0;

  	for (i = 0; i < c->count; i++)

  		c->controls[i].reserved2[0] = 0;

  	/* V4L2_CID_PRIVATE_BASE cannot be used as control class
  	   when using extended controls.
  	   Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
  	   is it allowed for backwards compatibility.
  	 */
  	if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
  		return 0;
  	/* Check that all controls are from the same control class. */
  	for (i = 0; i < c->count; i++) {
  		if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
  			c->error_idx = i;
  			return 0;
  		}
  	}
  	return 1;
  }

  static int check_fmt(const struct v4l2_ioctl_ops *ops, enum v4l2_buf_type type)

  {

  	if (ops == NULL)
  		return -EINVAL;

  	switch (type) {
  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:

  		if (ops->vidioc_g_fmt_vid_cap ||
  				ops->vidioc_g_fmt_vid_cap_mplane)
  			return 0;
  		break;
  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
  		if (ops->vidioc_g_fmt_vid_cap_mplane)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_VIDEO_OVERLAY:

  		if (ops->vidioc_g_fmt_vid_overlay)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:

  		if (ops->vidioc_g_fmt_vid_out ||
  				ops->vidioc_g_fmt_vid_out_mplane)
  			return 0;
  		break;
  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
  		if (ops->vidioc_g_fmt_vid_out_mplane)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:

  		if (ops->vidioc_g_fmt_vid_out_overlay)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_VBI_CAPTURE:

  		if (ops->vidioc_g_fmt_vbi_cap)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_VBI_OUTPUT:

  		if (ops->vidioc_g_fmt_vbi_out)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:

  		if (ops->vidioc_g_fmt_sliced_vbi_cap)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:

  		if (ops->vidioc_g_fmt_sliced_vbi_out)

  			return 0;
  		break;
  	case V4L2_BUF_TYPE_PRIVATE:

  		if (ops->vidioc_g_fmt_type_private)

  			return 0;
  		break;
  	}
  	return -EINVAL;
  }

  static long __video_do_ioctl(struct file *file,

  		unsigned int cmd, void *arg)
  {
  	struct video_device *vfd = video_devdata(file);

  	const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;

  	void *fh = file->private_data;

  	struct v4l2_fh *vfh = NULL;

  	int use_fh_prio = 0;

  	long ret_prio = 0;

  	long ret = -ENOTTY;

  	if (ops == NULL) {
  		printk(KERN_WARNING "videodev: \"%s\" has no ioctl_ops.
  ",
  				vfd->name);

  		return ret;

  	}

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

  	if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {

  		vfh = file->private_data;

  		use_fh_prio = test_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
  	}

  	if (use_fh_prio)
  		ret_prio = v4l2_prio_check(vfd->prio, vfh->prio);

  	switch (cmd) {

  	/* --- capabilities ------------------------------------------ */
  	case VIDIOC_QUERYCAP:
  	{
  		struct v4l2_capability *cap = (struct v4l2_capability *)arg;

  		if (!ops->vidioc_querycap)

  			break;

  		cap->version = LINUX_VERSION_CODE;

  		ret = ops->vidioc_querycap(file, fh, cap);

  		if (!ret)
  			dbgarg(cmd, "driver=%s, card=%s, bus=%s, "
  					"version=0x%08x, "
  					"capabilities=0x%08x
  ",
  					cap->driver, cap->card, cap->bus_info,
  					cap->version,
  					cap->capabilities);
  		break;
  	}
  
  	/* --- priority ------------------------------------------ */
  	case VIDIOC_G_PRIORITY:
  	{
  		enum v4l2_priority *p = arg;

  		if (ops->vidioc_g_priority) {
  			ret = ops->vidioc_g_priority(file, fh, p);

  		} else if (use_fh_prio) {

  			*p = v4l2_prio_max(&vfd->v4l2_dev->prio);
  			ret = 0;
  		}

  		if (!ret)
  			dbgarg(cmd, "priority is %d
  ", *p);
  		break;
  	}
  	case VIDIOC_S_PRIORITY:
  	{
  		enum v4l2_priority *p = arg;

  		if (!ops->vidioc_s_priority && !use_fh_prio)

  			break;

  		dbgarg(cmd, "setting priority to %d
  ", *p);

  		if (ops->vidioc_s_priority)
  			ret = ops->vidioc_s_priority(file, fh, *p);
  		else

  			ret = ret_prio ? ret_prio :
  				v4l2_prio_change(&vfd->v4l2_dev->prio,
  							&vfh->prio, *p);

  		break;
  	}
  
  	/* --- capture ioctls ---------------------------------------- */
  	case VIDIOC_ENUM_FMT:
  	{
  		struct v4l2_fmtdesc *f = arg;

  		switch (f->type) {

  		case V4L2_BUF_TYPE_VIDEO_CAPTURE:

  			if (likely(ops->vidioc_enum_fmt_vid_cap))

  				ret = ops->vidioc_enum_fmt_vid_cap(file, fh, f);

  			break;

  		case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:

  			if (likely(ops->vidioc_enum_fmt_vid_cap_mplane))

  				ret = ops->vidioc_enum_fmt_vid_cap_mplane(file,
  									fh, f);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OVERLAY:

  			if (likely(ops->vidioc_enum_fmt_vid_overlay))

  				ret = ops->vidioc_enum_fmt_vid_overlay(file,

  					fh, f);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OUTPUT:

  			if (likely(ops->vidioc_enum_fmt_vid_out))

  				ret = ops->vidioc_enum_fmt_vid_out(file, fh, f);

  			break;

  		case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:

  			if (likely(ops->vidioc_enum_fmt_vid_out_mplane))

  				ret = ops->vidioc_enum_fmt_vid_out_mplane(file,
  									fh, f);
  			break;

  		case V4L2_BUF_TYPE_PRIVATE:

  			if (likely(ops->vidioc_enum_fmt_type_private))

  				ret = ops->vidioc_enum_fmt_type_private(file,

  								fh, f);
  			break;
  		default:
  			break;
  		}

  		if (likely (!ret))

  			dbgarg(cmd, "index=%d, type=%d, flags=%d, "
  				"pixelformat=%c%c%c%c, description='%s'
  ",
  				f->index, f->type, f->flags,
  				(f->pixelformat & 0xff),
  				(f->pixelformat >>  8) & 0xff,
  				(f->pixelformat >> 16) & 0xff,
  				(f->pixelformat >> 24) & 0xff,
  				f->description);

  		else if (ret == -ENOTTY &&
  			 (ops->vidioc_enum_fmt_vid_cap ||
  			  ops->vidioc_enum_fmt_vid_out ||
  			  ops->vidioc_enum_fmt_vid_cap_mplane ||
  			  ops->vidioc_enum_fmt_vid_out_mplane ||
  			  ops->vidioc_enum_fmt_vid_overlay ||
  			  ops->vidioc_enum_fmt_type_private))
  			ret = -EINVAL;

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

  		/* FIXME: Should be one dump per type */
  		dbgarg(cmd, "type=%s
  ", prt_names(f->type, v4l2_type_names));
  
  		switch (f->type) {
  		case V4L2_BUF_TYPE_VIDEO_CAPTURE:

  			if (ops->vidioc_g_fmt_vid_cap)

  				ret = ops->vidioc_g_fmt_vid_cap(file, fh, f);

  			if (!ret)
  				v4l_print_pix_fmt(vfd, &f->fmt.pix);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:

  			if (ops->vidioc_g_fmt_vid_cap_mplane)

  				ret = ops->vidioc_g_fmt_vid_cap_mplane(file,
  									fh, f);

  			if (!ret)
  				v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OVERLAY:

  			if (likely(ops->vidioc_g_fmt_vid_overlay))

  				ret = ops->vidioc_g_fmt_vid_overlay(file,

  								    fh, f);
  			break;
  		case V4L2_BUF_TYPE_VIDEO_OUTPUT:

  			if (ops->vidioc_g_fmt_vid_out)

  				ret = ops->vidioc_g_fmt_vid_out(file, fh, f);

  			if (!ret)
  				v4l_print_pix_fmt(vfd, &f->fmt.pix);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:

  			if (ops->vidioc_g_fmt_vid_out_mplane)

  				ret = ops->vidioc_g_fmt_vid_out_mplane(file,
  									fh, f);

  			if (!ret)
  				v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:

  			if (likely(ops->vidioc_g_fmt_vid_out_overlay))

  				ret = ops->vidioc_g_fmt_vid_out_overlay(file,

  				       fh, f);
  			break;
  		case V4L2_BUF_TYPE_VBI_CAPTURE:

  			if (likely(ops->vidioc_g_fmt_vbi_cap))

  				ret = ops->vidioc_g_fmt_vbi_cap(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_VBI_OUTPUT:

  			if (likely(ops->vidioc_g_fmt_vbi_out))

  				ret = ops->vidioc_g_fmt_vbi_out(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:

  			if (likely(ops->vidioc_g_fmt_sliced_vbi_cap))

  				ret = ops->vidioc_g_fmt_sliced_vbi_cap(file,

  									fh, f);
  			break;
  		case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:

  			if (likely(ops->vidioc_g_fmt_sliced_vbi_out))

  				ret = ops->vidioc_g_fmt_sliced_vbi_out(file,

  									fh, f);
  			break;
  		case V4L2_BUF_TYPE_PRIVATE:

  			if (likely(ops->vidioc_g_fmt_type_private))

  				ret = ops->vidioc_g_fmt_type_private(file,

  								fh, f);
  			break;
  		}

  		if (unlikely(ret == -ENOTTY && have_fmt_ops(g)))
  			ret = -EINVAL;

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

  		if (!have_fmt_ops(s))
  			break;
  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}
  		ret = -EINVAL;

  		/* FIXME: Should be one dump per type */
  		dbgarg(cmd, "type=%s
  ", prt_names(f->type, v4l2_type_names));
  
  		switch (f->type) {
  		case V4L2_BUF_TYPE_VIDEO_CAPTURE:

  			CLEAR_AFTER_FIELD(f, fmt.pix);

  			v4l_print_pix_fmt(vfd, &f->fmt.pix);

  			if (ops->vidioc_s_fmt_vid_cap)

  				ret = ops->vidioc_s_fmt_vid_cap(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
  			CLEAR_AFTER_FIELD(f, fmt.pix_mp);
  			v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);

  			if (ops->vidioc_s_fmt_vid_cap_mplane)

  				ret = ops->vidioc_s_fmt_vid_cap_mplane(file,
  									fh, f);

  			break;
  		case V4L2_BUF_TYPE_VIDEO_OVERLAY:

  			CLEAR_AFTER_FIELD(f, fmt.win);

  			if (ops->vidioc_s_fmt_vid_overlay)
  				ret = ops->vidioc_s_fmt_vid_overlay(file,

  								    fh, f);
  			break;
  		case V4L2_BUF_TYPE_VIDEO_OUTPUT:

  			CLEAR_AFTER_FIELD(f, fmt.pix);

  			v4l_print_pix_fmt(vfd, &f->fmt.pix);

  			if (ops->vidioc_s_fmt_vid_out)

  				ret = ops->vidioc_s_fmt_vid_out(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
  			CLEAR_AFTER_FIELD(f, fmt.pix_mp);
  			v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);

  			if (ops->vidioc_s_fmt_vid_out_mplane)

  				ret = ops->vidioc_s_fmt_vid_out_mplane(file,
  									fh, f);

  			break;
  		case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:

  			CLEAR_AFTER_FIELD(f, fmt.win);

  			if (ops->vidioc_s_fmt_vid_out_overlay)
  				ret = ops->vidioc_s_fmt_vid_out_overlay(file,

  					fh, f);
  			break;
  		case V4L2_BUF_TYPE_VBI_CAPTURE:

  			CLEAR_AFTER_FIELD(f, fmt.vbi);

  			if (likely(ops->vidioc_s_fmt_vbi_cap))

  				ret = ops->vidioc_s_fmt_vbi_cap(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_VBI_OUTPUT:

  			CLEAR_AFTER_FIELD(f, fmt.vbi);

  			if (likely(ops->vidioc_s_fmt_vbi_out))

  				ret = ops->vidioc_s_fmt_vbi_out(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:

  			CLEAR_AFTER_FIELD(f, fmt.sliced);

  			if (likely(ops->vidioc_s_fmt_sliced_vbi_cap))

  				ret = ops->vidioc_s_fmt_sliced_vbi_cap(file,

  									fh, f);
  			break;
  		case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:

  			CLEAR_AFTER_FIELD(f, fmt.sliced);

  			if (likely(ops->vidioc_s_fmt_sliced_vbi_out))

  				ret = ops->vidioc_s_fmt_sliced_vbi_out(file,

  									fh, f);

  			break;
  		case V4L2_BUF_TYPE_PRIVATE:

  			/* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */

  			if (likely(ops->vidioc_s_fmt_type_private))

  				ret = ops->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
  ", prt_names(f->type,
  						v4l2_type_names));
  		switch (f->type) {
  		case V4L2_BUF_TYPE_VIDEO_CAPTURE:

  			CLEAR_AFTER_FIELD(f, fmt.pix);

  			if (ops->vidioc_try_fmt_vid_cap)

  				ret = ops->vidioc_try_fmt_vid_cap(file, fh, f);

  			if (!ret)
  				v4l_print_pix_fmt(vfd, &f->fmt.pix);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
  			CLEAR_AFTER_FIELD(f, fmt.pix_mp);

  			if (ops->vidioc_try_fmt_vid_cap_mplane)

  				ret = ops->vidioc_try_fmt_vid_cap_mplane(file,
  									 fh, f);

  			if (!ret)
  				v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OVERLAY:

  			CLEAR_AFTER_FIELD(f, fmt.win);

  			if (likely(ops->vidioc_try_fmt_vid_overlay))

  				ret = ops->vidioc_try_fmt_vid_overlay(file,

  					fh, f);
  			break;
  		case V4L2_BUF_TYPE_VIDEO_OUTPUT:

  			CLEAR_AFTER_FIELD(f, fmt.pix);

  			if (ops->vidioc_try_fmt_vid_out)

  				ret = ops->vidioc_try_fmt_vid_out(file, fh, f);

  			if (!ret)
  				v4l_print_pix_fmt(vfd, &f->fmt.pix);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
  			CLEAR_AFTER_FIELD(f, fmt.pix_mp);

  			if (ops->vidioc_try_fmt_vid_out_mplane)

  				ret = ops->vidioc_try_fmt_vid_out_mplane(file,
  									 fh, f);

  			if (!ret)
  				v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
  			break;

  		case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:

  			CLEAR_AFTER_FIELD(f, fmt.win);

  			if (likely(ops->vidioc_try_fmt_vid_out_overlay))

  				ret = ops->vidioc_try_fmt_vid_out_overlay(file,

  				       fh, f);
  			break;
  		case V4L2_BUF_TYPE_VBI_CAPTURE:

  			CLEAR_AFTER_FIELD(f, fmt.vbi);

  			if (likely(ops->vidioc_try_fmt_vbi_cap))

  				ret = ops->vidioc_try_fmt_vbi_cap(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_VBI_OUTPUT:

  			CLEAR_AFTER_FIELD(f, fmt.vbi);

  			if (likely(ops->vidioc_try_fmt_vbi_out))

  				ret = ops->vidioc_try_fmt_vbi_out(file, fh, f);

  			break;
  		case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:

  			CLEAR_AFTER_FIELD(f, fmt.sliced);

  			if (likely(ops->vidioc_try_fmt_sliced_vbi_cap))

  				ret = ops->vidioc_try_fmt_sliced_vbi_cap(file,

  								fh, f);
  			break;
  		case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:

  			CLEAR_AFTER_FIELD(f, fmt.sliced);

  			if (likely(ops->vidioc_try_fmt_sliced_vbi_out))

  				ret = ops->vidioc_try_fmt_sliced_vbi_out(file,

  								fh, f);
  			break;
  		case V4L2_BUF_TYPE_PRIVATE:

  			/* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */

  			if (likely(ops->vidioc_try_fmt_type_private))

  				ret = ops->vidioc_try_fmt_type_private(file,

  								fh, f);
  			break;
  		}

  		if (unlikely(ret == -ENOTTY && have_fmt_ops(try)))
  			ret = -EINVAL;

  		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 (!ops->vidioc_reqbufs)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		ret = check_fmt(ops, p->type);

  		if (ret)
  			break;

  		if (p->type < V4L2_BUF_TYPE_PRIVATE)
  			CLEAR_AFTER_FIELD(p, memory);

  		ret = ops->vidioc_reqbufs(file, fh, p);

  		dbgarg(cmd, "count=%d, type=%s, memory=%s
  ",
  				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 (!ops->vidioc_querybuf)

  			break;

  		ret = check_fmt(ops, p->type);

  		if (ret)
  			break;

  		ret = ops->vidioc_querybuf(file, fh, p);

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

  		if (!ops->vidioc_qbuf)

  			break;

  		ret = check_fmt(ops, p->type);

  		if (ret)
  			break;

  		ret = ops->vidioc_qbuf(file, fh, p);

  		if (!ret)
  			dbgbuf(cmd, vfd, p);
  		break;
  	}
  	case VIDIOC_DQBUF:
  	{
  		struct v4l2_buffer *p = arg;

  		if (!ops->vidioc_dqbuf)

  			break;

  		ret = check_fmt(ops, p->type);

  		if (ret)
  			break;

  		ret = ops->vidioc_dqbuf(file, fh, p);

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

  		if (!ops->vidioc_overlay)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "value=%d
  ", *i);

  		ret = ops->vidioc_overlay(file, fh, *i);

  		break;
  	}
  	case VIDIOC_G_FBUF:
  	{
  		struct v4l2_framebuffer *p = arg;

  		if (!ops->vidioc_g_fbuf)

  			break;

  		ret = ops->vidioc_g_fbuf(file, fh, arg);

  		if (!ret) {
  			dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx
  ",
  					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 (!ops->vidioc_s_fbuf)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx
  ",
  			p->capability, p->flags, (unsigned long)p->base);
  		v4l_print_pix_fmt(vfd, &p->fmt);

  		ret = ops->vidioc_s_fbuf(file, fh, arg);

  		break;
  	}
  	case VIDIOC_STREAMON:
  	{
  		enum v4l2_buf_type i = *(int *)arg;

  		if (!ops->vidioc_streamon)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "type=%s
  ", prt_names(i, v4l2_type_names));

  		ret = ops->vidioc_streamon(file, fh, i);

  		break;
  	}
  	case VIDIOC_STREAMOFF:
  	{
  		enum v4l2_buf_type i = *(int *)arg;

  		if (!ops->vidioc_streamoff)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "type=%s
  ", prt_names(i, v4l2_type_names));

  		ret = ops->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 = "";

  		if (id == 0)
  			break;
  		ret = -EINVAL;

  		/* 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)

  			break;

  
  		v4l2_video_std_construct(p, curr_id, descr);

  
  		dbgarg(cmd, "index=%d, id=0x%Lx, name=%s, fps=%d/%d, "
  				"framelines=%d
  ", 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;

  		/* Calls the specific handler */

  		if (ops->vidioc_g_std)
  			ret = ops->vidioc_g_std(file, fh, id);

  		else if (vfd->current_norm) {
  			ret = 0;

  			*id = vfd->current_norm;

  		}

  		if (likely(!ret))

  			dbgarg(cmd, "std=0x%08Lx
  ", (long long unsigned)*id);
  		break;
  	}
  	case VIDIOC_S_STD:
  	{
  		v4l2_std_id *id = arg, norm;
  
  		dbgarg(cmd, "std=%08Lx
  ", (long long unsigned)*id);

  		if (!ops->vidioc_s_std)
  			break;
  
  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}
  		ret = -EINVAL;

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

  		ret = ops->vidioc_s_std(file, fh, &norm);

  
  		/* Updates standard information */
  		if (ret >= 0)
  			vfd->current_norm = norm;
  		break;
  	}
  	case VIDIOC_QUERYSTD:
  	{
  		v4l2_std_id *p = arg;

  		if (!ops->vidioc_querystd)

  			break;

  		/*
  		 * If nothing detected, it should return all supported
  		 * Drivers just need to mask the std argument, in order
  		 * to remove the standards that don't apply from the mask.
  		 * This means that tuners, audio and video decoders can join
  		 * their efforts to improve the standards detection
  		 */
  		*p = vfd->tvnorms;

  		ret = ops->vidioc_querystd(file, fh, arg);

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

  		/*
  		 * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
  		 * CAP_STD here based on ioctl handler provided by the
  		 * driver. If the driver doesn't support these
  		 * for a specific input, it must override these flags.
  		 */
  		if (ops->vidioc_s_std)
  			p->capabilities |= V4L2_IN_CAP_STD;
  		if (ops->vidioc_s_dv_preset)
  			p->capabilities |= V4L2_IN_CAP_PRESETS;
  		if (ops->vidioc_s_dv_timings)
  			p->capabilities |= V4L2_IN_CAP_CUSTOM_TIMINGS;

  		if (!ops->vidioc_enum_input)

  			break;

  		ret = ops->vidioc_enum_input(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "index=%d, name=%s, type=%d, "
  				"audioset=%d, "
  				"tuner=%d, std=%08Lx, status=%d
  ",
  				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 (!ops->vidioc_g_input)

  			break;

  		ret = ops->vidioc_g_input(file, fh, i);

  		if (!ret)
  			dbgarg(cmd, "value=%d
  ", *i);
  		break;
  	}
  	case VIDIOC_S_INPUT:
  	{
  		unsigned int *i = arg;

  		if (!ops->vidioc_s_input)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "value=%d
  ", *i);

  		ret = ops->vidioc_s_input(file, fh, *i);

  		break;
  	}
  
  	/* ------ output switching ---------- */
  	case VIDIOC_ENUMOUTPUT:
  	{
  		struct v4l2_output *p = arg;

  		if (!ops->vidioc_enum_output)

  			break;

  		/*
  		 * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
  		 * CAP_STD here based on ioctl handler provided by the
  		 * driver. If the driver doesn't support these
  		 * for a specific output, it must override these flags.
  		 */
  		if (ops->vidioc_s_std)
  			p->capabilities |= V4L2_OUT_CAP_STD;
  		if (ops->vidioc_s_dv_preset)
  			p->capabilities |= V4L2_OUT_CAP_PRESETS;
  		if (ops->vidioc_s_dv_timings)
  			p->capabilities |= V4L2_OUT_CAP_CUSTOM_TIMINGS;

  		ret = ops->vidioc_enum_output(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "index=%d, name=%s, type=%d, "
  				"audioset=0x%x, "
  				"modulator=%d, std=0x%08Lx
  ",
  				p->index, p->name, p->type, p->audioset,
  				p->modulator, (unsigned long long)p->std);
  		break;
  	}
  	case VIDIOC_G_OUTPUT:
  	{
  		unsigned int *i = arg;

  		if (!ops->vidioc_g_output)

  			break;

  		ret = ops->vidioc_g_output(file, fh, i);

  		if (!ret)
  			dbgarg(cmd, "value=%d
  ", *i);
  		break;
  	}
  	case VIDIOC_S_OUTPUT:
  	{
  		unsigned int *i = arg;

  		if (!ops->vidioc_s_output)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "value=%d
  ", *i);

  		ret = ops->vidioc_s_output(file, fh, *i);

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

  		if (vfh && vfh->ctrl_handler)
  			ret = v4l2_queryctrl(vfh->ctrl_handler, p);
  		else if (vfd->ctrl_handler)

  			ret = v4l2_queryctrl(vfd->ctrl_handler, p);
  		else if (ops->vidioc_queryctrl)
  			ret = ops->vidioc_queryctrl(file, fh, p);
  		else

  			break;

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

  		if (vfh && vfh->ctrl_handler)
  			ret = v4l2_g_ctrl(vfh->ctrl_handler, p);
  		else if (vfd->ctrl_handler)

  			ret = v4l2_g_ctrl(vfd->ctrl_handler, p);
  		else if (ops->vidioc_g_ctrl)

  			ret = ops->vidioc_g_ctrl(file, fh, p);
  		else if (ops->vidioc_g_ext_ctrls) {

  			struct v4l2_ext_controls ctrls;
  			struct v4l2_ext_control ctrl;
  
  			ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
  			ctrls.count = 1;
  			ctrls.controls = &ctrl;
  			ctrl.id = p->id;
  			ctrl.value = p->value;
  			if (check_ext_ctrls(&ctrls, 1)) {

  				ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);

  				if (ret == 0)
  					p->value = ctrl.value;
  			}
  		} else
  			break;
  		if (!ret)
  			dbgarg(cmd, "id=0x%x, value=%d
  ", p->id, p->value);
  		else
  			dbgarg(cmd, "id=0x%x
  ", p->id);
  		break;
  	}
  	case VIDIOC_S_CTRL:
  	{
  		struct v4l2_control *p = arg;
  		struct v4l2_ext_controls ctrls;
  		struct v4l2_ext_control ctrl;

  		if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&

  			!ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  
  		dbgarg(cmd, "id=0x%x, value=%d
  ", p->id, p->value);

  		if (vfh && vfh->ctrl_handler) {

  			ret = v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);

  			break;
  		}

  		if (vfd->ctrl_handler) {

  			ret = v4l2_s_ctrl(NULL, vfd->ctrl_handler, p);

  			break;
  		}

  		if (ops->vidioc_s_ctrl) {
  			ret = ops->vidioc_s_ctrl(file, fh, p);

  			break;
  		}

  		if (!ops->vidioc_s_ext_ctrls)

  			break;
  
  		ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
  		ctrls.count = 1;
  		ctrls.controls = &ctrl;
  		ctrl.id = p->id;
  		ctrl.value = p->value;
  		if (check_ext_ctrls(&ctrls, 1))

  			ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);

  		else
  			ret = -EINVAL;

  		break;
  	}
  	case VIDIOC_G_EXT_CTRLS:
  	{
  		struct v4l2_ext_controls *p = arg;
  
  		p->error_idx = p->count;

  		if (vfh && vfh->ctrl_handler)
  			ret = v4l2_g_ext_ctrls(vfh->ctrl_handler, p);
  		else if (vfd->ctrl_handler)

  			ret = v4l2_g_ext_ctrls(vfd->ctrl_handler, p);

  		else if (ops->vidioc_g_ext_ctrls)
  			ret = check_ext_ctrls(p, 0) ?
  				ops->vidioc_g_ext_ctrls(file, fh, p) :
  				-EINVAL;

  		else
  			break;

  		v4l_print_ext_ctrls(cmd, vfd, p, !ret);
  		break;
  	}
  	case VIDIOC_S_EXT_CTRLS:
  	{
  		struct v4l2_ext_controls *p = arg;
  
  		p->error_idx = p->count;

  		if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
  				!ops->vidioc_s_ext_ctrls)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		v4l_print_ext_ctrls(cmd, vfd, p, 1);

  		if (vfh && vfh->ctrl_handler)

  			ret = v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, p);

  		else if (vfd->ctrl_handler)

  			ret = v4l2_s_ext_ctrls(NULL, vfd->ctrl_handler, p);

  		else if (check_ext_ctrls(p, 0))

  			ret = ops->vidioc_s_ext_ctrls(file, fh, p);

  		else
  			ret = -EINVAL;

  		break;
  	}
  	case VIDIOC_TRY_EXT_CTRLS:
  	{
  		struct v4l2_ext_controls *p = arg;
  
  		p->error_idx = p->count;

  		if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
  				!ops->vidioc_try_ext_ctrls)

  			break;
  		v4l_print_ext_ctrls(cmd, vfd, p, 1);

  		if (vfh && vfh->ctrl_handler)
  			ret = v4l2_try_ext_ctrls(vfh->ctrl_handler, p);
  		else if (vfd->ctrl_handler)

  			ret = v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
  		else if (check_ext_ctrls(p, 0))

  			ret = ops->vidioc_try_ext_ctrls(file, fh, p);

  		else
  			ret = -EINVAL;

  		break;
  	}
  	case VIDIOC_QUERYMENU:
  	{
  		struct v4l2_querymenu *p = arg;

  		if (vfh && vfh->ctrl_handler)
  			ret = v4l2_querymenu(vfh->ctrl_handler, p);
  		else if (vfd->ctrl_handler)

  			ret = v4l2_querymenu(vfd->ctrl_handler, p);
  		else if (ops->vidioc_querymenu)
  			ret = ops->vidioc_querymenu(file, fh, p);
  		else

  			break;

  		if (!ret)
  			dbgarg(cmd, "id=0x%x, index=%d, name=%s
  ",
  				p->id, p->index, p->name);
  		else
  			dbgarg(cmd, "id=0x%x, index=%d
  ",
  				p->id, p->index);
  		break;
  	}
  	/* --- audio ---------------------------------------------- */
  	case VIDIOC_ENUMAUDIO:
  	{
  		struct v4l2_audio *p = arg;

  		if (!ops->vidioc_enumaudio)

  			break;

  		ret = ops->vidioc_enumaudio(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
  					"mode=0x%x
  ", p->index, p->name,
  					p->capability, p->mode);
  		else
  			dbgarg(cmd, "index=%d
  ", p->index);
  		break;
  	}
  	case VIDIOC_G_AUDIO:
  	{
  		struct v4l2_audio *p = arg;

  		if (!ops->vidioc_g_audio)

  			break;

  		ret = ops->vidioc_g_audio(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
  					"mode=0x%x
  ", p->index,
  					p->name, p->capability, p->mode);
  		else
  			dbgarg(cmd, "index=%d
  ", p->index);
  		break;
  	}
  	case VIDIOC_S_AUDIO:
  	{
  		struct v4l2_audio *p = arg;

  		if (!ops->vidioc_s_audio)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
  					"mode=0x%x
  ", p->index, p->name,
  					p->capability, p->mode);

  		ret = ops->vidioc_s_audio(file, fh, p);

  		break;
  	}
  	case VIDIOC_ENUMAUDOUT:
  	{
  		struct v4l2_audioout *p = arg;

  		if (!ops->vidioc_enumaudout)

  			break;
  		dbgarg(cmd, "Enum for index=%d
  ", p->index);

  		ret = ops->vidioc_enumaudout(file, fh, p);

  		if (!ret)
  			dbgarg2("index=%d, name=%s, capability=%d, "
  					"mode=%d
  ", p->index, p->name,
  					p->capability, p->mode);
  		break;
  	}
  	case VIDIOC_G_AUDOUT:
  	{
  		struct v4l2_audioout *p = arg;

  		if (!ops->vidioc_g_audout)

  			break;

  		ret = ops->vidioc_g_audout(file, fh, p);

  		if (!ret)
  			dbgarg2("index=%d, name=%s, capability=%d, "
  					"mode=%d
  ", p->index, p->name,
  					p->capability, p->mode);
  		break;
  	}
  	case VIDIOC_S_AUDOUT:
  	{
  		struct v4l2_audioout *p = arg;

  		if (!ops->vidioc_s_audout)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "index=%d, name=%s, capability=%d, "
  					"mode=%d
  ", p->index, p->name,
  					p->capability, p->mode);

  		ret = ops->vidioc_s_audout(file, fh, p);

  		break;
  	}
  	case VIDIOC_G_MODULATOR:
  	{
  		struct v4l2_modulator *p = arg;

  		if (!ops->vidioc_g_modulator)

  			break;

  		ret = ops->vidioc_g_modulator(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "index=%d, name=%s, "
  					"capability=%d, rangelow=%d,"
  					" rangehigh=%d, txsubchans=%d
  ",
  					p->index, p->name, p->capability,
  					p->rangelow, p->rangehigh,
  					p->txsubchans);
  		break;
  	}
  	case VIDIOC_S_MODULATOR:
  	{
  		struct v4l2_modulator *p = arg;

  		if (!ops->vidioc_s_modulator)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "index=%d, name=%s, capability=%d, "
  				"rangelow=%d, rangehigh=%d, txsubchans=%d
  ",
  				p->index, p->name, p->capability, p->rangelow,
  				p->rangehigh, p->txsubchans);

  			ret = ops->vidioc_s_modulator(file, fh, p);

  		break;
  	}
  	case VIDIOC_G_CROP:
  	{
  		struct v4l2_crop *p = arg;

  		if (!ops->vidioc_g_crop && !ops->vidioc_g_selection)

  			break;

  		dbgarg(cmd, "type=%s
  ", prt_names(p->type, v4l2_type_names));

  
  		if (ops->vidioc_g_crop) {
  			ret = ops->vidioc_g_crop(file, fh, p);
  		} else {
  			/* simulate capture crop using selection api */
  			struct v4l2_selection s = {
  				.type = p->type,
  			};
  
  			/* crop means compose for output devices */
  			if (V4L2_TYPE_IS_OUTPUT(p->type))
  				s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
  			else
  				s.target = V4L2_SEL_TGT_CROP_ACTIVE;
  
  			ret = ops->vidioc_g_selection(file, fh, &s);
  
  			/* copying results to old structure on success */
  			if (!ret)
  				p->c = s.r;
  		}

  		if (!ret)
  			dbgrect(vfd, "", &p->c);
  		break;
  	}
  	case VIDIOC_S_CROP:
  	{
  		struct v4l2_crop *p = arg;

  		if (!ops->vidioc_s_crop && !ops->vidioc_s_selection)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "type=%s
  ", prt_names(p->type, v4l2_type_names));
  		dbgrect(vfd, "", &p->c);

  
  		if (ops->vidioc_s_crop) {
  			ret = ops->vidioc_s_crop(file, fh, p);
  		} else {
  			/* simulate capture crop using selection api */
  			struct v4l2_selection s = {
  				.type = p->type,
  				.r = p->c,
  			};
  
  			/* crop means compose for output devices */
  			if (V4L2_TYPE_IS_OUTPUT(p->type))
  				s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
  			else
  				s.target = V4L2_SEL_TGT_CROP_ACTIVE;
  
  			ret = ops->vidioc_s_selection(file, fh, &s);
  		}

  		break;
  	}

  	case VIDIOC_G_SELECTION:
  	{
  		struct v4l2_selection *p = arg;
  
  		if (!ops->vidioc_g_selection)
  			break;
  
  		dbgarg(cmd, "type=%s
  ", prt_names(p->type, v4l2_type_names));
  
  		ret = ops->vidioc_g_selection(file, fh, p);
  		if (!ret)
  			dbgrect(vfd, "", &p->r);
  		break;
  	}
  	case VIDIOC_S_SELECTION:
  	{
  		struct v4l2_selection *p = arg;
  
  		if (!ops->vidioc_s_selection)
  			break;
  
  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}
  
  		dbgarg(cmd, "type=%s
  ", prt_names(p->type, v4l2_type_names));
  		dbgrect(vfd, "", &p->r);
  
  		ret = ops->vidioc_s_selection(file, fh, p);
  		break;
  	}

  	case VIDIOC_CROPCAP:
  	{
  		struct v4l2_cropcap *p = arg;
  
  		/*FIXME: Should also show v4l2_fract pixelaspect */

  		if (!ops->vidioc_cropcap && !ops->vidioc_g_selection)

  			break;

  		dbgarg(cmd, "type=%s
  ", prt_names(p->type, v4l2_type_names));

  		if (ops->vidioc_cropcap) {
  			ret = ops->vidioc_cropcap(file, fh, p);
  		} else {
  			struct v4l2_selection s = { .type = p->type };
  
  			/* obtaining bounds */
  			if (V4L2_TYPE_IS_OUTPUT(p->type))
  				s.target = V4L2_SEL_TGT_COMPOSE_BOUNDS;
  			else
  				s.target = V4L2_SEL_TGT_CROP_BOUNDS;
  
  			ret = ops->vidioc_g_selection(file, fh, &s);
  			if (ret)
  				break;
  			p->bounds = s.r;
  
  			/* obtaining defrect */
  			if (V4L2_TYPE_IS_OUTPUT(p->type))
  				s.target = V4L2_SEL_TGT_COMPOSE_DEFAULT;
  			else
  				s.target = V4L2_SEL_TGT_CROP_DEFAULT;
  
  			ret = ops->vidioc_g_selection(file, fh, &s);
  			if (ret)
  				break;
  			p->defrect = s.r;
  
  			/* setting trivial pixelaspect */
  			p->pixelaspect.numerator = 1;
  			p->pixelaspect.denominator = 1;
  		}

  		if (!ret) {
  			dbgrect(vfd, "bounds ", &p->bounds);
  			dbgrect(vfd, "defrect ", &p->defrect);
  		}
  		break;
  	}
  	case VIDIOC_G_JPEGCOMP:
  	{
  		struct v4l2_jpegcompression *p = arg;

  		if (!ops->vidioc_g_jpegcomp)

  			break;

  		ret = ops->vidioc_g_jpegcomp(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "quality=%d, APPn=%d, "
  					"APP_len=%d, COM_len=%d, "
  					"jpeg_markers=%d
  ",
  					p->quality, p->APPn, p->APP_len,
  					p->COM_len, p->jpeg_markers);
  		break;
  	}
  	case VIDIOC_S_JPEGCOMP:
  	{
  		struct v4l2_jpegcompression *p = arg;

  		if (!ops->vidioc_g_jpegcomp)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "quality=%d, APPn=%d, APP_len=%d, "
  					"COM_len=%d, jpeg_markers=%d
  ",
  					p->quality, p->APPn, p->APP_len,
  					p->COM_len, p->jpeg_markers);

  		ret = ops->vidioc_s_jpegcomp(file, fh, p);

  		break;
  	}
  	case VIDIOC_G_ENC_INDEX:
  	{
  		struct v4l2_enc_idx *p = arg;

  		if (!ops->vidioc_g_enc_index)

  			break;

  		ret = ops->vidioc_g_enc_index(file, fh, p);

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

  		if (!ops->vidioc_encoder_cmd)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		ret = ops->vidioc_encoder_cmd(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "cmd=%d, flags=%x
  ", p->cmd, p->flags);
  		break;
  	}
  	case VIDIOC_TRY_ENCODER_CMD:
  	{
  		struct v4l2_encoder_cmd *p = arg;

  		if (!ops->vidioc_try_encoder_cmd)

  			break;

  		ret = ops->vidioc_try_encoder_cmd(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "cmd=%d, flags=%x
  ", p->cmd, p->flags);
  		break;
  	}
  	case VIDIOC_G_PARM:
  	{
  		struct v4l2_streamparm *p = arg;

  		if (!ops->vidioc_g_parm && !vfd->current_norm)
  			break;

  		if (ops->vidioc_g_parm) {

  			ret = check_fmt(ops, p->type);
  			if (ret)
  				break;

  			ret = ops->vidioc_g_parm(file, fh, p);

  		} else {

  			v4l2_std_id std = vfd->current_norm;

  			ret = -EINVAL;

  			if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)

  				break;

  			ret = 0;

  			if (ops->vidioc_g_std)
  				ret = ops->vidioc_g_std(file, fh, &std);

  			if (ret == 0)
  				v4l2_video_std_frame_period(std,
  						    &p->parm.capture.timeperframe);

  		}
  
  		dbgarg(cmd, "type=%d
  ", p->type);
  		break;
  	}
  	case VIDIOC_S_PARM:
  	{
  		struct v4l2_streamparm *p = arg;

  		if (!ops->vidioc_s_parm)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		ret = check_fmt(ops, p->type);
  		if (ret)
  			break;

  		dbgarg(cmd, "type=%d
  ", p->type);

  		ret = ops->vidioc_s_parm(file, fh, p);

  		break;
  	}
  	case VIDIOC_G_TUNER:
  	{
  		struct v4l2_tuner *p = arg;

  		if (!ops->vidioc_g_tuner)

  			break;

  		p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
  			V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;

  		ret = ops->vidioc_g_tuner(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "index=%d, name=%s, type=%d, "
  					"capability=0x%x, rangelow=%d, "
  					"rangehigh=%d, signal=%d, afc=%d, "
  					"rxsubchans=0x%x, audmode=%d
  ",
  					p->index, p->name, p->type,
  					p->capability, p->rangelow,
  					p->rangehigh, p->signal, p->afc,
  					p->rxsubchans, p->audmode);
  		break;
  	}
  	case VIDIOC_S_TUNER:
  	{
  		struct v4l2_tuner *p = arg;

  		if (!ops->vidioc_s_tuner)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
  			V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;

  		dbgarg(cmd, "index=%d, name=%s, type=%d, "
  				"capability=0x%x, rangelow=%d, "
  				"rangehigh=%d, signal=%d, afc=%d, "
  				"rxsubchans=0x%x, audmode=%d
  ",
  				p->index, p->name, p->type,
  				p->capability, p->rangelow,
  				p->rangehigh, p->signal, p->afc,
  				p->rxsubchans, p->audmode);

  		ret = ops->vidioc_s_tuner(file, fh, p);

  		break;
  	}
  	case VIDIOC_G_FREQUENCY:
  	{
  		struct v4l2_frequency *p = arg;

  		if (!ops->vidioc_g_frequency)

  			break;

  		p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
  			V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;

  		ret = ops->vidioc_g_frequency(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "tuner=%d, type=%d, frequency=%d
  ",
  					p->tuner, p->type, p->frequency);
  		break;
  	}
  	case VIDIOC_S_FREQUENCY:
  	{
  		struct v4l2_frequency *p = arg;

  		if (!ops->vidioc_s_frequency)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		dbgarg(cmd, "tuner=%d, type=%d, frequency=%d
  ",
  				p->tuner, p->type, p->frequency);

  		ret = ops->vidioc_s_frequency(file, fh, p);

  		break;
  	}
  	case VIDIOC_G_SLICED_VBI_CAP:
  	{
  		struct v4l2_sliced_vbi_cap *p = arg;

  		if (!ops->vidioc_g_sliced_vbi_cap)

  			break;

  
  		/* Clear up to type, everything after type is zerod already */
  		memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));

  		dbgarg(cmd, "type=%s
  ", prt_names(p->type, v4l2_type_names));

  		ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);

  		if (!ret)
  			dbgarg2("service_set=%d
  ", p->service_set);
  		break;
  	}
  	case VIDIOC_LOG_STATUS:
  	{

  		if (!ops->vidioc_log_status)

  			break;

  		ret = ops->vidioc_log_status(file, fh);

  		break;
  	}
  #ifdef CONFIG_VIDEO_ADV_DEBUG
  	case VIDIOC_DBG_G_REGISTER:
  	{

  		struct v4l2_dbg_register *p = arg;

  		if (ops->vidioc_g_register) {
  			if (!capable(CAP_SYS_ADMIN))
  				ret = -EPERM;
  			else
  				ret = ops->vidioc_g_register(file, fh, p);
  		}

  		break;
  	}
  	case VIDIOC_DBG_S_REGISTER:
  	{

  		struct v4l2_dbg_register *p = arg;

  		if (ops->vidioc_s_register) {
  			if (!capable(CAP_SYS_ADMIN))
  				ret = -EPERM;
  			else
  				ret = ops->vidioc_s_register(file, fh, p);
  		}

  		break;
  	}
  #endif

  	case VIDIOC_DBG_G_CHIP_IDENT:

  	{

  		struct v4l2_dbg_chip_ident *p = arg;

  		if (!ops->vidioc_g_chip_ident)

  			break;

  		p->ident = V4L2_IDENT_NONE;
  		p->revision = 0;

  		ret = ops->vidioc_g_chip_ident(file, fh, p);

  		if (!ret)
  			dbgarg(cmd, "chip_ident=%u, revision=0x%x
  ", p->ident, p->revision);
  		break;
  	}

  	case VIDIOC_S_HW_FREQ_SEEK:
  	{
  		struct v4l2_hw_freq_seek *p = arg;

  		enum v4l2_tuner_type type;

  		if (!ops->vidioc_s_hw_freq_seek)

  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  		type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
  			V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;

  		dbgarg(cmd,

  			"tuner=%u, type=%u, seek_upward=%u, wrap_around=%u, spacing=%u
  ",
  			p->tuner, p->type, p->seek_upward, p->wrap_around, p->spacing);
  		if (p->type != type)
  			ret = -EINVAL;
  		else
  			ret = ops->vidioc_s_hw_freq_seek(file, fh, p);

  		break;
  	}

  	case VIDIOC_ENUM_FRAMESIZES:
  	{
  		struct v4l2_frmsizeenum *p = arg;
  
  		if (!ops->vidioc_enum_framesizes)
  			break;

  		ret = ops->vidioc_enum_framesizes(file, fh, p);
  		dbgarg(cmd,

  			"index=%d, pixelformat=%c%c%c%c, type=%d ",
  			p->index,
  			(p->pixel_format & 0xff),
  			(p->pixel_format >>  8) & 0xff,
  			(p->pixel_format >> 16) & 0xff,
  			(p->pixel_format >> 24) & 0xff,
  			p->type);

  		switch (p->type) {
  		case V4L2_FRMSIZE_TYPE_DISCRETE:

  			dbgarg3("width = %d, height=%d
  ",

  				p->discrete.width, p->discrete.height);
  			break;
  		case V4L2_FRMSIZE_TYPE_STEPWISE:

  			dbgarg3("min %dx%d, max %dx%d, step %dx%d
  ",

  				p->stepwise.min_width,  p->stepwise.min_height,
  				p->stepwise.step_width, p->stepwise.step_height,
  				p->stepwise.max_width,  p->stepwise.max_height);
  			break;
  		case V4L2_FRMSIZE_TYPE_CONTINUOUS:

  			dbgarg3("continuous
  ");

  			break;
  		default:

  			dbgarg3("- Unknown type!
  ");

  		}
  
  		break;
  	}
  	case VIDIOC_ENUM_FRAMEINTERVALS:
  	{
  		struct v4l2_frmivalenum *p = arg;
  
  		if (!ops->vidioc_enum_frameintervals)
  			break;

  		ret = ops->vidioc_enum_frameintervals(file, fh, p);
  		dbgarg(cmd,
  			"index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
  			p->index, p->pixel_format,
  			p->width, p->height, p->type);
  		switch (p->type) {
  		case V4L2_FRMIVAL_TYPE_DISCRETE:
  			dbgarg2("fps=%d/%d
  ",
  				p->discrete.numerator,
  				p->discrete.denominator);
  			break;
  		case V4L2_FRMIVAL_TYPE_STEPWISE:

  			dbgarg2("min=%d/%d, max=%d/%d, step=%d/%d
  ",
  				p->stepwise.min.numerator,
  				p->stepwise.min.denominator,
  				p->stepwise.max.numerator,
  				p->stepwise.max.denominator,
  				p->stepwise.step.numerator,
  				p->stepwise.step.denominator);

  			break;
  		case V4L2_FRMIVAL_TYPE_CONTINUOUS:
  			dbgarg2("continuous
  ");
  			break;
  		default:
  			dbgarg2("- Unknown type!
  ");
  		}
  		break;
  	}

  	case VIDIOC_ENUM_DV_PRESETS:
  	{
  		struct v4l2_dv_enum_preset *p = arg;
  
  		if (!ops->vidioc_enum_dv_presets)
  			break;
  
  		ret = ops->vidioc_enum_dv_presets(file, fh, p);
  		if (!ret)
  			dbgarg(cmd,
  				"index=%d, preset=%d, name=%s, width=%d,"
  				" height=%d ",
  				p->index, p->preset, p->name, p->width,
  				p->height);
  		break;
  	}
  	case VIDIOC_S_DV_PRESET:
  	{
  		struct v4l2_dv_preset *p = arg;
  
  		if (!ops->vidioc_s_dv_preset)
  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  
  		dbgarg(cmd, "preset=%d
  ", p->preset);
  		ret = ops->vidioc_s_dv_preset(file, fh, p);
  		break;
  	}
  	case VIDIOC_G_DV_PRESET:
  	{
  		struct v4l2_dv_preset *p = arg;
  
  		if (!ops->vidioc_g_dv_preset)
  			break;
  
  		ret = ops->vidioc_g_dv_preset(file, fh, p);
  		if (!ret)
  			dbgarg(cmd, "preset=%d
  ", p->preset);
  		break;
  	}
  	case VIDIOC_QUERY_DV_PRESET:
  	{
  		struct v4l2_dv_preset *p = arg;
  
  		if (!ops->vidioc_query_dv_preset)
  			break;
  
  		ret = ops->vidioc_query_dv_preset(file, fh, p);
  		if (!ret)
  			dbgarg(cmd, "preset=%d
  ", p->preset);
  		break;
  	}
  	case VIDIOC_S_DV_TIMINGS:
  	{
  		struct v4l2_dv_timings *p = arg;
  
  		if (!ops->vidioc_s_dv_timings)
  			break;

  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}

  
  		switch (p->type) {
  		case V4L2_DV_BT_656_1120:
  			dbgarg2("bt-656/1120:interlaced=%d, pixelclock=%lld,"
  				" width=%d, height=%d, polarities=%x,"
  				" hfrontporch=%d, hsync=%d, hbackporch=%d,"
  				" vfrontporch=%d, vsync=%d, vbackporch=%d,"
  				" il_vfrontporch=%d, il_vsync=%d,"
  				" il_vbackporch=%d
  ",
  				p->bt.interlaced, p->bt.pixelclock,
  				p->bt.width, p->bt.height, p->bt.polarities,
  				p->bt.hfrontporch, p->bt.hsync,
  				p->bt.hbackporch, p->bt.vfrontporch,
  				p->bt.vsync, p->bt.vbackporch,
  				p->bt.il_vfrontporch, p->bt.il_vsync,
  				p->bt.il_vbackporch);
  			ret = ops->vidioc_s_dv_timings(file, fh, p);
  			break;
  		default:
  			dbgarg2("Unknown type %d!
  ", p->type);
  			break;
  		}
  		break;
  	}
  	case VIDIOC_G_DV_TIMINGS:
  	{
  		struct v4l2_dv_timings *p = arg;
  
  		if (!ops->vidioc_g_dv_timings)
  			break;
  
  		ret = ops->vidioc_g_dv_timings(file, fh, p);
  		if (!ret) {
  			switch (p->type) {
  			case V4L2_DV_BT_656_1120:
  				dbgarg2("bt-656/1120:interlaced=%d,"
  					" pixelclock=%lld,"
  					" width=%d, height=%d, polarities=%x,"
  					" hfrontporch=%d, hsync=%d,"
  					" hbackporch=%d, vfrontporch=%d,"
  					" vsync=%d, vbackporch=%d,"
  					" il_vfrontporch=%d, il_vsync=%d,"
  					" il_vbackporch=%d
  ",
  					p->bt.interlaced, p->bt.pixelclock,
  					p->bt.width, p->bt.height,
  					p->bt.polarities, p->bt.hfrontporch,
  					p->bt.hsync, p->bt.hbackporch,
  					p->bt.vfrontporch, p->bt.vsync,
  					p->bt.vbackporch, p->bt.il_vfrontporch,
  					p->bt.il_vsync, p->bt.il_vbackporch);
  				break;
  			default:
  				dbgarg2("Unknown type %d!
  ", p->type);
  				break;
  			}
  		}
  		break;
  	}

  	case VIDIOC_DQEVENT:
  	{
  		struct v4l2_event *ev = arg;
  
  		if (!ops->vidioc_subscribe_event)
  			break;
  
  		ret = v4l2_event_dequeue(fh, ev, file->f_flags & O_NONBLOCK);
  		if (ret < 0) {
  			dbgarg(cmd, "no pending events?");
  			break;
  		}
  		dbgarg(cmd,
  		       "pending=%d, type=0x%8.8x, sequence=%d, "
  		       "timestamp=%lu.%9.9lu ",
  		       ev->pending, ev->type, ev->sequence,
  		       ev->timestamp.tv_sec, ev->timestamp.tv_nsec);
  		break;
  	}
  	case VIDIOC_SUBSCRIBE_EVENT:
  	{
  		struct v4l2_event_subscription *sub = arg;
  
  		if (!ops->vidioc_subscribe_event)
  			break;

  		ret = ops->vidioc_subscribe_event(fh, sub);
  		if (ret < 0) {
  			dbgarg(cmd, "failed, ret=%ld", ret);
  			break;
  		}
  		dbgarg(cmd, "type=0x%8.8x", sub->type);
  		break;
  	}
  	case VIDIOC_UNSUBSCRIBE_EVENT:
  	{
  		struct v4l2_event_subscription *sub = arg;
  
  		if (!ops->vidioc_unsubscribe_event)
  			break;
  
  		ret = ops->vidioc_unsubscribe_event(fh, sub);
  		if (ret < 0) {
  			dbgarg(cmd, "failed, ret=%ld", ret);
  			break;
  		}
  		dbgarg(cmd, "type=0x%8.8x", sub->type);
  		break;
  	}

  	case VIDIOC_CREATE_BUFS:
  	{
  		struct v4l2_create_buffers *create = arg;
  
  		if (!ops->vidioc_create_bufs)
  			break;
  		if (ret_prio) {
  			ret = ret_prio;
  			break;
  		}
  		ret = check_fmt(ops, create->format.type);
  		if (ret)
  			break;
  
  		ret = ops->vidioc_create_bufs(file, fh, create);
  
  		dbgarg(cmd, "count=%d @ %d
  ", create->count, create->index);
  		break;
  	}
  	case VIDIOC_PREPARE_BUF:
  	{
  		struct v4l2_buffer *b = arg;
  
  		if (!ops->vidioc_prepare_buf)
  			break;
  		ret = check_fmt(ops, b->type);
  		if (ret)
  			break;
  
  		ret = ops->vidioc_prepare_buf(file, fh, b);
  
  		dbgarg(cmd, "index=%d", b->index);
  		break;
  	}

  	default:

  		if (!ops->vidioc_default)
  			break;

  		ret = ops->vidioc_default(file, fh, ret_prio >= 0, cmd, arg);

  		break;

  	} /* switch */
  
  	if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
  		if (ret < 0) {
  			v4l_print_ioctl(vfd->name, cmd);

  			printk(KERN_CONT " error %ld
  ", ret);

  		}
  	}
  
  	return ret;
  }

  /* In some cases, only a few fields are used as input, i.e. when the app sets
   * "index" and then the driver fills in the rest of the structure for the thing
   * with that index.  We only need to copy up the first non-input field.  */
  static unsigned long cmd_input_size(unsigned int cmd)
  {
  	/* Size of structure up to and including 'field' */

  #define CMDINSIZE(cmd, type, field) 				\
  	case VIDIOC_##cmd: 					\
  		return offsetof(struct v4l2_##type, field) + 	\
  			sizeof(((struct v4l2_##type *)0)->field);

  	switch (cmd) {

  		CMDINSIZE(ENUM_FMT,		fmtdesc,	type);
  		CMDINSIZE(G_FMT,		format,		type);

  		CMDINSIZE(QUERYBUF,		buffer,		length);

  		CMDINSIZE(G_PARM,		streamparm,	type);
  		CMDINSIZE(ENUMSTD,		standard,	index);
  		CMDINSIZE(ENUMINPUT,		input,		index);
  		CMDINSIZE(G_CTRL,		control,	id);
  		CMDINSIZE(G_TUNER,		tuner,		index);
  		CMDINSIZE(QUERYCTRL,		queryctrl,	id);
  		CMDINSIZE(QUERYMENU,		querymenu,	index);
  		CMDINSIZE(ENUMOUTPUT,		output,		index);
  		CMDINSIZE(G_MODULATOR,		modulator,	index);
  		CMDINSIZE(G_FREQUENCY,		frequency,	tuner);
  		CMDINSIZE(CROPCAP,		cropcap,	type);
  		CMDINSIZE(G_CROP,		crop,		type);
  		CMDINSIZE(ENUMAUDIO,		audio, 		index);
  		CMDINSIZE(ENUMAUDOUT,		audioout, 	index);
  		CMDINSIZE(ENCODER_CMD,		encoder_cmd,	flags);
  		CMDINSIZE(TRY_ENCODER_CMD,	encoder_cmd,	flags);
  		CMDINSIZE(G_SLICED_VBI_CAP,	sliced_vbi_cap,	type);
  		CMDINSIZE(ENUM_FRAMESIZES,	frmsizeenum,	pixel_format);
  		CMDINSIZE(ENUM_FRAMEINTERVALS,	frmivalenum,	height);
  	default:
  		return _IOC_SIZE(cmd);
  	}
  }

  static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
  			    void * __user *user_ptr, void ***kernel_ptr)
  {
  	int ret = 0;
  
  	switch (cmd) {
  	case VIDIOC_QUERYBUF:
  	case VIDIOC_QBUF:
  	case VIDIOC_DQBUF: {
  		struct v4l2_buffer *buf = parg;
  
  		if (V4L2_TYPE_IS_MULTIPLANAR(buf->type) && buf->length > 0) {
  			if (buf->length > VIDEO_MAX_PLANES) {
  				ret = -EINVAL;
  				break;
  			}
  			*user_ptr = (void __user *)buf->m.planes;

  			*kernel_ptr = (void *)&buf->m.planes;

  			*array_size = sizeof(struct v4l2_plane) * buf->length;
  			ret = 1;
  		}
  		break;
  	}
  
  	case VIDIOC_S_EXT_CTRLS:
  	case VIDIOC_G_EXT_CTRLS:
  	case VIDIOC_TRY_EXT_CTRLS: {
  		struct v4l2_ext_controls *ctrls = parg;
  
  		if (ctrls->count != 0) {

  			if (ctrls->count > V4L2_CID_MAX_CTRLS) {
  				ret = -EINVAL;
  				break;
  			}

  			*user_ptr = (void __user *)ctrls->controls;

  			*kernel_ptr = (void *)&ctrls->controls;

  			*array_size = sizeof(struct v4l2_ext_control)
  				    * ctrls->count;
  			ret = 1;
  		}
  		break;
  	}
  	}
  
  	return ret;
  }

  long
  video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
  	       v4l2_kioctl func)

  {
  	char	sbuf[128];
  	void    *mbuf = NULL;