drivers/media/video/v4l2-ioctl.c

   1 /*
   2  * Video capture interface for Linux version 2
   3  *
   4  * A generic framework to process V4L2 ioctl commands.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  * Authors:     Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
  12  *              Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19
  20 #define __OLD_VIDIOC_ /* To allow fixing old calls */
  21 #include <linux/videodev.h>
  22 #include <linux/videodev2.h>
  23
  24 #ifdef CONFIG_VIDEO_V4L1
  25 #include <linux/videodev.h>
  26 #endif
  27 #include <media/v4l2-common.h>
  28 #include <media/v4l2-ioctl.h>
  29 #include <media/v4l2-fh.h>
  30 #include <media/v4l2-event.h>
  31 #include <media/v4l2-chip-ident.h>
  32
  33 #define dbgarg(cmd, fmt, arg...) \
  34                 do {                                                    \
  35                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {            \
  36                         printk(KERN_DEBUG "%s: ",  vfd->name);          \
  37                         v4l_printk_ioctl(cmd);                          \
  38                         printk(" " fmt,  ## arg);                       \
  39                     }                                                   \
  40                 } while (0)
  41
  42 #define dbgarg2(fmt, arg...) \
  43                 do {                                                    \
  44                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
  45                         printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\
  46                 } while (0)
  47
  48 #define dbgarg3(fmt, arg...) \
  49                 do {                                                    \
  50                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
  51                         printk(KERN_CONT "%s: " fmt, vfd->name, ## arg);\
  52                 } while (0)
  53
  54 /* Zero out the end of the struct pointed to by p.  Everthing after, but
  55  * not including, the specified field is cleared. */
  56 #define CLEAR_AFTER_FIELD(p, field) \
  57         memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
  58         0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
  59
  60 struct std_descr {
  61         v4l2_std_id std;
  62         const char *descr;
  63 };
  64
  65 static const struct std_descr standards[] = {
  66         { V4L2_STD_NTSC,        "NTSC"      },
  67         { V4L2_STD_NTSC_M,      "NTSC-M"    },
  68         { V4L2_STD_NTSC_M_JP,   "NTSC-M-JP" },
  69         { V4L2_STD_NTSC_M_KR,   "NTSC-M-KR" },
  70         { V4L2_STD_NTSC_443,    "NTSC-443"  },
  71         { V4L2_STD_PAL,         "PAL"       },
  72         { V4L2_STD_PAL_BG,      "PAL-BG"    },
  73         { V4L2_STD_PAL_B,       "PAL-B"     },
  74         { V4L2_STD_PAL_B1,      "PAL-B1"    },
  75         { V4L2_STD_PAL_G,       "PAL-G"     },
  76         { V4L2_STD_PAL_H,       "PAL-H"     },
  77         { V4L2_STD_PAL_I,       "PAL-I"     },
  78         { V4L2_STD_PAL_DK,      "PAL-DK"    },
  79         { V4L2_STD_PAL_D,       "PAL-D"     },
  80         { V4L2_STD_PAL_D1,      "PAL-D1"    },
  81         { V4L2_STD_PAL_K,       "PAL-K"     },
  82         { V4L2_STD_PAL_M,       "PAL-M"     },
  83         { V4L2_STD_PAL_N,       "PAL-N"     },
  84         { V4L2_STD_PAL_Nc,      "PAL-Nc"    },
  85         { V4L2_STD_PAL_60,      "PAL-60"    },
  86         { V4L2_STD_SECAM,       "SECAM"     },
  87         { V4L2_STD_SECAM_B,     "SECAM-B"   },
  88         { V4L2_STD_SECAM_G,     "SECAM-G"   },
  89         { V4L2_STD_SECAM_H,     "SECAM-H"   },
  90         { V4L2_STD_SECAM_DK,    "SECAM-DK"  },
  91         { V4L2_STD_SECAM_D,     "SECAM-D"   },
  92         { V4L2_STD_SECAM_K,     "SECAM-K"   },
  93         { V4L2_STD_SECAM_K1,    "SECAM-K1"  },
  94         { V4L2_STD_SECAM_L,     "SECAM-L"   },
  95         { V4L2_STD_SECAM_LC,    "SECAM-Lc"  },
  96         { 0,                    "Unknown"   }
  97 };
  98
  99 /* video4linux standard ID conversion to standard name
 100  */
 101 const char *v4l2_norm_to_name(v4l2_std_id id)
 102 {
 103         u32 myid = id;
 104         int i;
 105
 106         /* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
 107            64 bit comparations. So, on that architecture, with some gcc
 108            variants, compilation fails. Currently, the max value is 30bit wide.
 109          */
 110         BUG_ON(myid != id);
 111
 112         for (i = 0; standards[i].std; i++)
 113                 if (myid == standards[i].std)
 114                         break;
 115         return standards[i].descr;
 116 }
 117 EXPORT_SYMBOL(v4l2_norm_to_name);
 118
 119 /* Returns frame period for the given standard */
 120 void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
 121 {
 122         if (id & V4L2_STD_525_60) {
 123                 frameperiod->numerator = 1001;
 124                 frameperiod->denominator = 30000;
 125         } else {
 126                 frameperiod->numerator = 1;
 127                 frameperiod->denominator = 25;
 128         }
 129 }
 130 EXPORT_SYMBOL(v4l2_video_std_frame_period);
 131
 132 /* Fill in the fields of a v4l2_standard structure according to the
 133    'id' and 'transmission' parameters.  Returns negative on error.  */
 134 int v4l2_video_std_construct(struct v4l2_standard *vs,
 135                              int id, const char *name)
 136 {
 137         vs->id = id;
 138         v4l2_video_std_frame_period(id, &vs->frameperiod);
 139         vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
 140         strlcpy(vs->name, name, sizeof(vs->name));
 141         return 0;
 142 }
 143 EXPORT_SYMBOL(v4l2_video_std_construct);
 144
 145 /* ----------------------------------------------------------------- */
 146 /* some arrays for pretty-printing debug messages of enum types      */
 147
 148 const char *v4l2_field_names[] = {
 149         [V4L2_FIELD_ANY]        = "any",
 150         [V4L2_FIELD_NONE]       = "none",
 151         [V4L2_FIELD_TOP]        = "top",
 152         [V4L2_FIELD_BOTTOM]     = "bottom",
 153         [V4L2_FIELD_INTERLACED] = "interlaced",
 154         [V4L2_FIELD_SEQ_TB]     = "seq-tb",
 155         [V4L2_FIELD_SEQ_BT]     = "seq-bt",
 156         [V4L2_FIELD_ALTERNATE]  = "alternate",
 157         [V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
 158         [V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
 159 };
 160 EXPORT_SYMBOL(v4l2_field_names);
 161
 162 const char *v4l2_type_names[] = {
 163         [V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
 164         [V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
 165         [V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
 166         [V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
 167         [V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
 168         [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
 169         [V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
 170         [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
 171 };
 172 EXPORT_SYMBOL(v4l2_type_names);
 173
 174 static const char *v4l2_memory_names[] = {
 175         [V4L2_MEMORY_MMAP]    = "mmap",
 176         [V4L2_MEMORY_USERPTR] = "userptr",
 177         [V4L2_MEMORY_OVERLAY] = "overlay",
 178 };
 179
 180 #define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \
 181                            arr[a] : "unknown")
 182
 183 /* ------------------------------------------------------------------ */
 184 /* debug help functions                                               */
 185
 186 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 187 static const char *v4l1_ioctls[] = {
 188         [_IOC_NR(VIDIOCGCAP)]       = "VIDIOCGCAP",
 189         [_IOC_NR(VIDIOCGCHAN)]      = "VIDIOCGCHAN",
 190         [_IOC_NR(VIDIOCSCHAN)]      = "VIDIOCSCHAN",
 191         [_IOC_NR(VIDIOCGTUNER)]     = "VIDIOCGTUNER",
 192         [_IOC_NR(VIDIOCSTUNER)]     = "VIDIOCSTUNER",
 193         [_IOC_NR(VIDIOCGPICT)]      = "VIDIOCGPICT",
 194         [_IOC_NR(VIDIOCSPICT)]      = "VIDIOCSPICT",
 195         [_IOC_NR(VIDIOCCAPTURE)]    = "VIDIOCCAPTURE",
 196         [_IOC_NR(VIDIOCGWIN)]       = "VIDIOCGWIN",
 197         [_IOC_NR(VIDIOCSWIN)]       = "VIDIOCSWIN",
 198         [_IOC_NR(VIDIOCGFBUF)]      = "VIDIOCGFBUF",
 199         [_IOC_NR(VIDIOCSFBUF)]      = "VIDIOCSFBUF",
 200         [_IOC_NR(VIDIOCKEY)]        = "VIDIOCKEY",
 201         [_IOC_NR(VIDIOCGFREQ)]      = "VIDIOCGFREQ",
 202         [_IOC_NR(VIDIOCSFREQ)]      = "VIDIOCSFREQ",
 203         [_IOC_NR(VIDIOCGAUDIO)]     = "VIDIOCGAUDIO",
 204         [_IOC_NR(VIDIOCSAUDIO)]     = "VIDIOCSAUDIO",
 205         [_IOC_NR(VIDIOCSYNC)]       = "VIDIOCSYNC",
 206         [_IOC_NR(VIDIOCMCAPTURE)]   = "VIDIOCMCAPTURE",
 207         [_IOC_NR(VIDIOCGMBUF)]      = "VIDIOCGMBUF",
 208         [_IOC_NR(VIDIOCGUNIT)]      = "VIDIOCGUNIT",
 209         [_IOC_NR(VIDIOCGCAPTURE)]   = "VIDIOCGCAPTURE",
 210         [_IOC_NR(VIDIOCSCAPTURE)]   = "VIDIOCSCAPTURE",
 211         [_IOC_NR(VIDIOCSPLAYMODE)]  = "VIDIOCSPLAYMODE",
 212         [_IOC_NR(VIDIOCSWRITEMODE)] = "VIDIOCSWRITEMODE",
 213         [_IOC_NR(VIDIOCGPLAYINFO)]  = "VIDIOCGPLAYINFO",
 214         [_IOC_NR(VIDIOCSMICROCODE)] = "VIDIOCSMICROCODE",
 215         [_IOC_NR(VIDIOCGVBIFMT)]    = "VIDIOCGVBIFMT",
 216         [_IOC_NR(VIDIOCSVBIFMT)]    = "VIDIOCSVBIFMT"
 217 };
 218 #define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
 219 #endif
 220
 221 static const char *v4l2_ioctls[] = {
 222         [_IOC_NR(VIDIOC_QUERYCAP)]         = "VIDIOC_QUERYCAP",
 223         [_IOC_NR(VIDIOC_RESERVED)]         = "VIDIOC_RESERVED",
 224         [_IOC_NR(VIDIOC_ENUM_FMT)]         = "VIDIOC_ENUM_FMT",
 225         [_IOC_NR(VIDIOC_G_FMT)]            = "VIDIOC_G_FMT",
 226         [_IOC_NR(VIDIOC_S_FMT)]            = "VIDIOC_S_FMT",
 227         [_IOC_NR(VIDIOC_REQBUFS)]          = "VIDIOC_REQBUFS",
 228         [_IOC_NR(VIDIOC_QUERYBUF)]         = "VIDIOC_QUERYBUF",
 229         [_IOC_NR(VIDIOC_G_FBUF)]           = "VIDIOC_G_FBUF",
 230         [_IOC_NR(VIDIOC_S_FBUF)]           = "VIDIOC_S_FBUF",
 231         [_IOC_NR(VIDIOC_OVERLAY)]          = "VIDIOC_OVERLAY",
 232         [_IOC_NR(VIDIOC_QBUF)]             = "VIDIOC_QBUF",
 233         [_IOC_NR(VIDIOC_DQBUF)]            = "VIDIOC_DQBUF",
 234         [_IOC_NR(VIDIOC_STREAMON)]         = "VIDIOC_STREAMON",
 235         [_IOC_NR(VIDIOC_STREAMOFF)]        = "VIDIOC_STREAMOFF",
 236         [_IOC_NR(VIDIOC_G_PARM)]           = "VIDIOC_G_PARM",
 237         [_IOC_NR(VIDIOC_S_PARM)]           = "VIDIOC_S_PARM",
 238         [_IOC_NR(VIDIOC_G_STD)]            = "VIDIOC_G_STD",
 239         [_IOC_NR(VIDIOC_S_STD)]            = "VIDIOC_S_STD",
 240         [_IOC_NR(VIDIOC_ENUMSTD)]          = "VIDIOC_ENUMSTD",
 241         [_IOC_NR(VIDIOC_ENUMINPUT)]        = "VIDIOC_ENUMINPUT",
 242         [_IOC_NR(VIDIOC_G_CTRL)]           = "VIDIOC_G_CTRL",
 243         [_IOC_NR(VIDIOC_S_CTRL)]           = "VIDIOC_S_CTRL",
 244         [_IOC_NR(VIDIOC_G_TUNER)]          = "VIDIOC_G_TUNER",
 245         [_IOC_NR(VIDIOC_S_TUNER)]          = "VIDIOC_S_TUNER",
 246         [_IOC_NR(VIDIOC_G_AUDIO)]          = "VIDIOC_G_AUDIO",
 247         [_IOC_NR(VIDIOC_S_AUDIO)]          = "VIDIOC_S_AUDIO",
 248         [_IOC_NR(VIDIOC_QUERYCTRL)]        = "VIDIOC_QUERYCTRL",
 249         [_IOC_NR(VIDIOC_QUERYMENU)]        = "VIDIOC_QUERYMENU",
 250         [_IOC_NR(VIDIOC_G_INPUT)]          = "VIDIOC_G_INPUT",
 251         [_IOC_NR(VIDIOC_S_INPUT)]          = "VIDIOC_S_INPUT",
 252         [_IOC_NR(VIDIOC_G_OUTPUT)]         = "VIDIOC_G_OUTPUT",
 253         [_IOC_NR(VIDIOC_S_OUTPUT)]         = "VIDIOC_S_OUTPUT",
 254         [_IOC_NR(VIDIOC_ENUMOUTPUT)]       = "VIDIOC_ENUMOUTPUT",
 255         [_IOC_NR(VIDIOC_G_AUDOUT)]         = "VIDIOC_G_AUDOUT",
 256         [_IOC_NR(VIDIOC_S_AUDOUT)]         = "VIDIOC_S_AUDOUT",
 257         [_IOC_NR(VIDIOC_G_MODULATOR)]      = "VIDIOC_G_MODULATOR",
 258         [_IOC_NR(VIDIOC_S_MODULATOR)]      = "VIDIOC_S_MODULATOR",
 259         [_IOC_NR(VIDIOC_G_FREQUENCY)]      = "VIDIOC_G_FREQUENCY",
 260         [_IOC_NR(VIDIOC_S_FREQUENCY)]      = "VIDIOC_S_FREQUENCY",
 261         [_IOC_NR(VIDIOC_CROPCAP)]          = "VIDIOC_CROPCAP",
 262         [_IOC_NR(VIDIOC_G_CROP)]           = "VIDIOC_G_CROP",
 263         [_IOC_NR(VIDIOC_S_CROP)]           = "VIDIOC_S_CROP",
 264         [_IOC_NR(VIDIOC_G_JPEGCOMP)]       = "VIDIOC_G_JPEGCOMP",
 265         [_IOC_NR(VIDIOC_S_JPEGCOMP)]       = "VIDIOC_S_JPEGCOMP",
 266         [_IOC_NR(VIDIOC_QUERYSTD)]         = "VIDIOC_QUERYSTD",
 267         [_IOC_NR(VIDIOC_TRY_FMT)]          = "VIDIOC_TRY_FMT",
 268         [_IOC_NR(VIDIOC_ENUMAUDIO)]        = "VIDIOC_ENUMAUDIO",
 269         [_IOC_NR(VIDIOC_ENUMAUDOUT)]       = "VIDIOC_ENUMAUDOUT",
 270         [_IOC_NR(VIDIOC_G_PRIORITY)]       = "VIDIOC_G_PRIORITY",
 271         [_IOC_NR(VIDIOC_S_PRIORITY)]       = "VIDIOC_S_PRIORITY",
 272         [_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP",
 273         [_IOC_NR(VIDIOC_LOG_STATUS)]       = "VIDIOC_LOG_STATUS",
 274         [_IOC_NR(VIDIOC_G_EXT_CTRLS)]      = "VIDIOC_G_EXT_CTRLS",
 275         [_IOC_NR(VIDIOC_S_EXT_CTRLS)]      = "VIDIOC_S_EXT_CTRLS",
 276         [_IOC_NR(VIDIOC_TRY_EXT_CTRLS)]    = "VIDIOC_TRY_EXT_CTRLS",
 277 #if 1
 278         [_IOC_NR(VIDIOC_ENUM_FRAMESIZES)]  = "VIDIOC_ENUM_FRAMESIZES",
 279         [_IOC_NR(VIDIOC_ENUM_FRAMEINTERVALS)] = "VIDIOC_ENUM_FRAMEINTERVALS",
 280         [_IOC_NR(VIDIOC_G_ENC_INDEX)]      = "VIDIOC_G_ENC_INDEX",
 281         [_IOC_NR(VIDIOC_ENCODER_CMD)]      = "VIDIOC_ENCODER_CMD",
 282         [_IOC_NR(VIDIOC_TRY_ENCODER_CMD)]  = "VIDIOC_TRY_ENCODER_CMD",
 283
 284         [_IOC_NR(VIDIOC_DBG_S_REGISTER)]   = "VIDIOC_DBG_S_REGISTER",
 285         [_IOC_NR(VIDIOC_DBG_G_REGISTER)]   = "VIDIOC_DBG_G_REGISTER",
 286
 287         [_IOC_NR(VIDIOC_DBG_G_CHIP_IDENT)] = "VIDIOC_DBG_G_CHIP_IDENT",
 288         [_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)]   = "VIDIOC_S_HW_FREQ_SEEK",
 289 #endif
 290         [_IOC_NR(VIDIOC_ENUM_DV_PRESETS)]  = "VIDIOC_ENUM_DV_PRESETS",
 291         [_IOC_NR(VIDIOC_S_DV_PRESET)]      = "VIDIOC_S_DV_PRESET",
 292         [_IOC_NR(VIDIOC_G_DV_PRESET)]      = "VIDIOC_G_DV_PRESET",
 293         [_IOC_NR(VIDIOC_QUERY_DV_PRESET)]  = "VIDIOC_QUERY_DV_PRESET",
 294         [_IOC_NR(VIDIOC_S_DV_TIMINGS)]     = "VIDIOC_S_DV_TIMINGS",
 295         [_IOC_NR(VIDIOC_G_DV_TIMINGS)]     = "VIDIOC_G_DV_TIMINGS",
 296         [_IOC_NR(VIDIOC_DQEVENT)]          = "VIDIOC_DQEVENT",
 297         [_IOC_NR(VIDIOC_SUBSCRIBE_EVENT)]  = "VIDIOC_SUBSCRIBE_EVENT",
 298         [_IOC_NR(VIDIOC_UNSUBSCRIBE_EVENT)] = "VIDIOC_UNSUBSCRIBE_EVENT",
 299 };
 300 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
 301
 302 /* Common ioctl debug function. This function can be used by
 303    external ioctl messages as well as internal V4L ioctl */
 304 void v4l_printk_ioctl(unsigned int cmd)
 305 {
 306         char *dir, *type;
 307
 308         switch (_IOC_TYPE(cmd)) {
 309         case 'd':
 310                 type = "v4l2_int";
 311                 break;
 312 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 313         case 'v':
 314                 if (_IOC_NR(cmd) >= V4L1_IOCTLS) {
 315                         type = "v4l1";
 316                         break;
 317                 }
 318                 printk("%s", v4l1_ioctls[_IOC_NR(cmd)]);
 319                 return;
 320 #endif
 321         case 'V':
 322                 if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
 323                         type = "v4l2";
 324                         break;
 325                 }
 326                 printk("%s", v4l2_ioctls[_IOC_NR(cmd)]);
 327                 return;
 328         default:
 329                 type = "unknown";
 330         }
 331
 332         switch (_IOC_DIR(cmd)) {
 333         case _IOC_NONE:              dir = "--"; break;
 334         case _IOC_READ:              dir = "r-"; break;
 335         case _IOC_WRITE:             dir = "-w"; break;
 336         case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
 337         default:                     dir = "*ERR*"; break;
 338         }
 339         printk("%s ioctl '%c', dir=%s, #%d (0x%08x)",
 340                 type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
 341 }
 342 EXPORT_SYMBOL(v4l_printk_ioctl);
 343
 344 /*
 345  * helper function -- handles userspace copying for ioctl arguments
 346  */
 347
 348 #ifdef __OLD_VIDIOC_
 349 static unsigned int
 350 video_fix_command(unsigned int cmd)
 351 {
 352         switch (cmd) {
 353         case VIDIOC_OVERLAY_OLD:
 354                 cmd = VIDIOC_OVERLAY;
 355                 break;
 356         case VIDIOC_S_PARM_OLD:
 357                 cmd = VIDIOC_S_PARM;
 358                 break;
 359         case VIDIOC_S_CTRL_OLD:
 360                 cmd = VIDIOC_S_CTRL;
 361                 break;
 362         case VIDIOC_G_AUDIO_OLD:
 363                 cmd = VIDIOC_G_AUDIO;
 364                 break;
 365         case VIDIOC_G_AUDOUT_OLD:
 366                 cmd = VIDIOC_G_AUDOUT;
 367                 break;
 368         case VIDIOC_CROPCAP_OLD:
 369                 cmd = VIDIOC_CROPCAP;
 370                 break;
 371         }
 372         return cmd;
 373 }
 374 #endif
 375
 376 /*
 377  * Obsolete usercopy function - Should be removed soon
 378  */
 379 long
 380 video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
 381                 v4l2_kioctl func)
 382 {
 383         char    sbuf[128];
 384         void    *mbuf = NULL;
 385         void    *parg = NULL;
 386         long    err  = -EINVAL;
 387         int     is_ext_ctrl;
 388         size_t  ctrls_size = 0;
 389         void __user *user_ptr = NULL;
 390
 391 #ifdef __OLD_VIDIOC_
 392         cmd = video_fix_command(cmd);
 393 #endif
 394         is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
 395                        cmd == VIDIOC_TRY_EXT_CTRLS);
 396
 397         /*  Copy arguments into temp kernel buffer  */
 398         switch (_IOC_DIR(cmd)) {
 399         case _IOC_NONE:
 400                 parg = NULL;
 401                 break;
 402         case _IOC_READ:
 403         case _IOC_WRITE:
 404         case (_IOC_WRITE | _IOC_READ):
 405                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 406                         parg = sbuf;
 407                 } else {
 408                         /* too big to allocate from stack */
 409                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 410                         if (NULL == mbuf)
 411                                 return -ENOMEM;
 412                         parg = mbuf;
 413                 }
 414
 415                 err = -EFAULT;
 416                 if (_IOC_DIR(cmd) & _IOC_WRITE)
 417                         if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 418                                 goto out;
 419                 break;
 420         }
 421         if (is_ext_ctrl) {
 422                 struct v4l2_ext_controls *p = parg;
 423
 424                 /* In case of an error, tell the caller that it wasn't
 425                    a specific control that caused it. */
 426                 p->error_idx = p->count;
 427                 user_ptr = (void __user *)p->controls;
 428                 if (p->count) {
 429                         ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
 430                         /* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
 431                         mbuf = kmalloc(ctrls_size, GFP_KERNEL);
 432                         err = -ENOMEM;
 433                         if (NULL == mbuf)
 434                                 goto out_ext_ctrl;
 435                         err = -EFAULT;
 436                         if (copy_from_user(mbuf, user_ptr, ctrls_size))
 437                                 goto out_ext_ctrl;
 438                         p->controls = mbuf;
 439                 }
 440         }
 441
 442         /* call driver */
 443         err = func(file, cmd, parg);
 444         if (err == -ENOIOCTLCMD)
 445                 err = -EINVAL;
 446         if (is_ext_ctrl) {
 447                 struct v4l2_ext_controls *p = parg;
 448
 449                 p->controls = (void *)user_ptr;
 450                 if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
 451                         err = -EFAULT;
 452                 goto out_ext_ctrl;
 453         }
 454         if (err < 0)
 455                 goto out;
 456
 457 out_ext_ctrl:
 458         /*  Copy results into user buffer  */
 459         switch (_IOC_DIR(cmd)) {
 460         case _IOC_READ:
 461         case (_IOC_WRITE | _IOC_READ):
 462                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 463                         err = -EFAULT;
 464                 break;
 465         }
 466
 467 out:
 468         kfree(mbuf);
 469         return err;
 470 }
 471 EXPORT_SYMBOL(video_usercopy);
 472
 473 static void dbgbuf(unsigned int cmd, struct video_device *vfd,
 474                                         struct v4l2_buffer *p)
 475 {
 476         struct v4l2_timecode *tc = &p->timecode;
 477
 478         dbgarg(cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, "
 479                 "bytesused=%d, flags=0x%08d, "
 480                 "field=%0d, sequence=%d, memory=%s, offset/userptr=0x%08lx, length=%d\n",
 481                         p->timestamp.tv_sec / 3600,
 482                         (int)(p->timestamp.tv_sec / 60) % 60,
 483                         (int)(p->timestamp.tv_sec % 60),
 484                         (long)p->timestamp.tv_usec,
 485                         p->index,
 486                         prt_names(p->type, v4l2_type_names),
 487                         p->bytesused, p->flags,
 488                         p->field, p->sequence,
 489                         prt_names(p->memory, v4l2_memory_names),
 490                         p->m.userptr, p->length);
 491         dbgarg2("timecode=%02d:%02d:%02d type=%d, "
 492                 "flags=0x%08d, frames=%d, userbits=0x%08x\n",
 493                         tc->hours, tc->minutes, tc->seconds,
 494                         tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
 495 }
 496
 497 static inline void dbgrect(struct video_device *vfd, char *s,
 498                                                         struct v4l2_rect *r)
 499 {
 500         dbgarg2("%sRect start at %dx%d, size=%dx%d\n", s, r->left, r->top,
 501                                                 r->width, r->height);
 502 };
 503
 504 static inline void v4l_print_pix_fmt(struct video_device *vfd,
 505                                                 struct v4l2_pix_format *fmt)
 506 {
 507         dbgarg2("width=%d, height=%d, format=%c%c%c%c, field=%s, "
 508                 "bytesperline=%d sizeimage=%d, colorspace=%d\n",
 509                 fmt->width, fmt->height,
 510                 (fmt->pixelformat & 0xff),
 511                 (fmt->pixelformat >>  8) & 0xff,
 512                 (fmt->pixelformat >> 16) & 0xff,
 513                 (fmt->pixelformat >> 24) & 0xff,
 514                 prt_names(fmt->field, v4l2_field_names),
 515                 fmt->bytesperline, fmt->sizeimage, fmt->colorspace);
 516 };
 517
 518 static inline void v4l_print_ext_ctrls(unsigned int cmd,
 519         struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals)
 520 {
 521         __u32 i;
 522
 523         if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG))
 524                 return;
 525         dbgarg(cmd, "");
 526         printk(KERN_CONT "class=0x%x", c->ctrl_class);
 527         for (i = 0; i < c->count; i++) {
 528                 if (show_vals && !c->controls[i].size)
 529                         printk(KERN_CONT " id/val=0x%x/0x%x",
 530                                 c->controls[i].id, c->controls[i].value);
 531                 else
 532                         printk(KERN_CONT " id=0x%x,size=%u",
 533                                 c->controls[i].id, c->controls[i].size);
 534         }
 535         printk(KERN_CONT "\n");
 536 };
 537
 538 static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
 539 {
 540         __u32 i;
 541
 542         /* zero the reserved fields */
 543         c->reserved[0] = c->reserved[1] = 0;
 544         for (i = 0; i < c->count; i++)
 545                 c->controls[i].reserved2[0] = 0;
 546
 547         /* V4L2_CID_PRIVATE_BASE cannot be used as control class
 548            when using extended controls.
 549            Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
 550            is it allowed for backwards compatibility.
 551          */
 552         if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
 553                 return 0;
 554         /* Check that all controls are from the same control class. */
 555         for (i = 0; i < c->count; i++) {
 556                 if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
 557                         c->error_idx = i;
 558                         return 0;
 559                 }
 560         }
 561         return 1;
 562 }
 563
 564 static int check_fmt(const struct v4l2_ioctl_ops *ops, enum v4l2_buf_type type)
 565 {
 566         if (ops == NULL)
 567                 return -EINVAL;
 568
 569         switch (type) {
 570         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 571                 if (ops->vidioc_g_fmt_vid_cap)
 572                         return 0;
 573                 break;
 574         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 575                 if (ops->vidioc_g_fmt_vid_overlay)
 576                         return 0;
 577                 break;
 578         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 579                 if (ops->vidioc_g_fmt_vid_out)
 580                         return 0;
 581                 break;
 582         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 583                 if (ops->vidioc_g_fmt_vid_out_overlay)
 584                         return 0;
 585                 break;
 586         case V4L2_BUF_TYPE_VBI_CAPTURE:
 587                 if (ops->vidioc_g_fmt_vbi_cap)
 588                         return 0;
 589                 break;
 590         case V4L2_BUF_TYPE_VBI_OUTPUT:
 591                 if (ops->vidioc_g_fmt_vbi_out)
 592                         return 0;
 593                 break;
 594         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 595                 if (ops->vidioc_g_fmt_sliced_vbi_cap)
 596                         return 0;
 597                 break;
 598         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 599                 if (ops->vidioc_g_fmt_sliced_vbi_out)
 600                         return 0;
 601                 break;
 602         case V4L2_BUF_TYPE_PRIVATE:
 603                 if (ops->vidioc_g_fmt_type_private)
 604                         return 0;
 605                 break;
 606         }
 607         return -EINVAL;
 608 }
 609
 610 static long __video_do_ioctl(struct file *file,
 611                 unsigned int cmd, void *arg)
 612 {
 613         struct video_device *vfd = video_devdata(file);
 614         const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
 615         void *fh = file->private_data;
 616         long ret = -EINVAL;
 617
 618         if (ops == NULL) {
 619                 printk(KERN_WARNING "videodev: \"%s\" has no ioctl_ops.\n",
 620                                 vfd->name);
 621                 return -EINVAL;
 622         }
 623
 624 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 625         /********************************************************
 626          All other V4L1 calls are handled by v4l1_compat module.
 627          Those calls will be translated into V4L2 calls, and
 628          __video_do_ioctl will be called again, with one or more
 629          V4L2 ioctls.
 630          ********************************************************/
 631         if (_IOC_TYPE(cmd) == 'v' && cmd != VIDIOCGMBUF &&
 632                                 _IOC_NR(cmd) < BASE_VIDIOCPRIVATE) {
 633                 return v4l_compat_translate_ioctl(file, cmd, arg,
 634                                                 __video_do_ioctl);
 635         }
 636 #endif
 637
 638         if ((vfd->debug & V4L2_DEBUG_IOCTL) &&
 639                                 !(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) {
 640                 v4l_print_ioctl(vfd->name, cmd);
 641                 printk(KERN_CONT "\n");
 642         }
 643
 644         switch (cmd) {
 645
 646 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 647         /***********************************************************
 648          Handles calls to the obsoleted V4L1 API
 649          Due to the nature of VIDIOCGMBUF, each driver that supports
 650          V4L1 should implement its own handler for this ioctl.
 651          ***********************************************************/
 652
 653         /* --- streaming capture ------------------------------------- */
 654         case VIDIOCGMBUF:
 655         {
 656                 struct video_mbuf *p = arg;
 657
 658                 if (!ops->vidiocgmbuf)
 659                         break;
 660                 ret = ops->vidiocgmbuf(file, fh, p);
 661                 if (!ret)
 662                         dbgarg(cmd, "size=%d, frames=%d, offsets=0x%08lx\n",
 663                                                 p->size, p->frames,
 664                                                 (unsigned long)p->offsets);
 665                 break;
 666         }
 667 #endif
 668
 669         /* --- capabilities ------------------------------------------ */
 670         case VIDIOC_QUERYCAP:
 671         {
 672                 struct v4l2_capability *cap = (struct v4l2_capability *)arg;
 673
 674                 if (!ops->vidioc_querycap)
 675                         break;
 676
 677                 ret = ops->vidioc_querycap(file, fh, cap);
 678                 if (!ret)
 679                         dbgarg(cmd, "driver=%s, card=%s, bus=%s, "
 680                                         "version=0x%08x, "
 681                                         "capabilities=0x%08x\n",
 682                                         cap->driver, cap->card, cap->bus_info,
 683                                         cap->version,
 684                                         cap->capabilities);
 685                 break;
 686         }
 687
 688         /* --- priority ------------------------------------------ */
 689         case VIDIOC_G_PRIORITY:
 690         {
 691                 enum v4l2_priority *p = arg;
 692
 693                 if (!ops->vidioc_g_priority)
 694                         break;
 695                 ret = ops->vidioc_g_priority(file, fh, p);
 696                 if (!ret)
 697                         dbgarg(cmd, "priority is %d\n", *p);
 698                 break;
 699         }
 700         case VIDIOC_S_PRIORITY:
 701         {
 702                 enum v4l2_priority *p = arg;
 703
 704                 if (!ops->vidioc_s_priority)
 705                         break;
 706                 dbgarg(cmd, "setting priority to %d\n", *p);
 707                 ret = ops->vidioc_s_priority(file, fh, *p);
 708                 break;
 709         }
 710
 711         /* --- capture ioctls ---------------------------------------- */
 712         case VIDIOC_ENUM_FMT:
 713         {
 714                 struct v4l2_fmtdesc *f = arg;
 715
 716                 switch (f->type) {
 717                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 718                         if (ops->vidioc_enum_fmt_vid_cap)
 719                                 ret = ops->vidioc_enum_fmt_vid_cap(file, fh, f);
 720                         break;
 721                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 722                         if (ops->vidioc_enum_fmt_vid_overlay)
 723                                 ret = ops->vidioc_enum_fmt_vid_overlay(file,
 724                                         fh, f);
 725                         break;
 726                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 727                         if (ops->vidioc_enum_fmt_vid_out)
 728                                 ret = ops->vidioc_enum_fmt_vid_out(file, fh, f);
 729                         break;
 730                 case V4L2_BUF_TYPE_PRIVATE:
 731                         if (ops->vidioc_enum_fmt_type_private)
 732                                 ret = ops->vidioc_enum_fmt_type_private(file,
 733                                                                 fh, f);
 734                         break;
 735                 default:
 736                         break;
 737                 }
 738                 if (!ret)
 739                         dbgarg(cmd, "index=%d, type=%d, flags=%d, "
 740                                 "pixelformat=%c%c%c%c, description='%s'\n",
 741                                 f->index, f->type, f->flags,
 742                                 (f->pixelformat & 0xff),
 743                                 (f->pixelformat >>  8) & 0xff,
 744                                 (f->pixelformat >> 16) & 0xff,
 745                                 (f->pixelformat >> 24) & 0xff,
 746                                 f->description);
 747                 break;
 748         }
 749         case VIDIOC_G_FMT:
 750         {
 751                 struct v4l2_format *f = (struct v4l2_format *)arg;
 752
 753                 /* FIXME: Should be one dump per type */
 754                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
 755
 756                 switch (f->type) {
 757                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 758                         if (ops->vidioc_g_fmt_vid_cap)
 759                                 ret = ops->vidioc_g_fmt_vid_cap(file, fh, f);
 760                         if (!ret)
 761                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 762                         break;
 763                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 764                         if (ops->vidioc_g_fmt_vid_overlay)
 765                                 ret = ops->vidioc_g_fmt_vid_overlay(file,
 766                                                                     fh, f);
 767                         break;
 768                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 769                         if (ops->vidioc_g_fmt_vid_out)
 770                                 ret = ops->vidioc_g_fmt_vid_out(file, fh, f);
 771                         if (!ret)
 772                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 773                         break;
 774                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 775                         if (ops->vidioc_g_fmt_vid_out_overlay)
 776                                 ret = ops->vidioc_g_fmt_vid_out_overlay(file,
 777                                        fh, f);
 778                         break;
 779                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 780                         if (ops->vidioc_g_fmt_vbi_cap)
 781                                 ret = ops->vidioc_g_fmt_vbi_cap(file, fh, f);
 782                         break;
 783                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 784                         if (ops->vidioc_g_fmt_vbi_out)
 785                                 ret = ops->vidioc_g_fmt_vbi_out(file, fh, f);
 786                         break;
 787                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 788                         if (ops->vidioc_g_fmt_sliced_vbi_cap)
 789                                 ret = ops->vidioc_g_fmt_sliced_vbi_cap(file,
 790                                                                         fh, f);
 791                         break;
 792                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 793                         if (ops->vidioc_g_fmt_sliced_vbi_out)
 794                                 ret = ops->vidioc_g_fmt_sliced_vbi_out(file,
 795                                                                         fh, f);
 796                         break;
 797                 case V4L2_BUF_TYPE_PRIVATE:
 798                         if (ops->vidioc_g_fmt_type_private)
 799                                 ret = ops->vidioc_g_fmt_type_private(file,
 800                                                                 fh, f);
 801                         break;
 802                 }
 803
 804                 break;
 805         }
 806         case VIDIOC_S_FMT:
 807         {
 808                 struct v4l2_format *f = (struct v4l2_format *)arg;
 809
 810                 /* FIXME: Should be one dump per type */
 811                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
 812
 813                 switch (f->type) {
 814                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 815                         CLEAR_AFTER_FIELD(f, fmt.pix);
 816                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
 817                         if (ops->vidioc_s_fmt_vid_cap)
 818                                 ret = ops->vidioc_s_fmt_vid_cap(file, fh, f);
 819                         break;
 820                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 821                         CLEAR_AFTER_FIELD(f, fmt.win);
 822                         if (ops->vidioc_s_fmt_vid_overlay)
 823                                 ret = ops->vidioc_s_fmt_vid_overlay(file,
 824                                                                     fh, f);
 825                         break;
 826                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 827                         CLEAR_AFTER_FIELD(f, fmt.pix);
 828                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
 829                         if (ops->vidioc_s_fmt_vid_out)
 830                                 ret = ops->vidioc_s_fmt_vid_out(file, fh, f);
 831                         break;
 832                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 833                         CLEAR_AFTER_FIELD(f, fmt.win);
 834                         if (ops->vidioc_s_fmt_vid_out_overlay)
 835                                 ret = ops->vidioc_s_fmt_vid_out_overlay(file,
 836                                         fh, f);
 837                         break;
 838                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 839                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 840                         if (ops->vidioc_s_fmt_vbi_cap)
 841                                 ret = ops->vidioc_s_fmt_vbi_cap(file, fh, f);
 842                         break;
 843                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 844                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 845                         if (ops->vidioc_s_fmt_vbi_out)
 846                                 ret = ops->vidioc_s_fmt_vbi_out(file, fh, f);
 847                         break;
 848                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 849                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 850                         if (ops->vidioc_s_fmt_sliced_vbi_cap)
 851                                 ret = ops->vidioc_s_fmt_sliced_vbi_cap(file,
 852                                                                         fh, f);
 853                         break;
 854                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 855                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 856                         if (ops->vidioc_s_fmt_sliced_vbi_out)
 857                                 ret = ops->vidioc_s_fmt_sliced_vbi_out(file,
 858                                                                         fh, f);
 859                         break;
 860                 case V4L2_BUF_TYPE_PRIVATE:
 861                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
 862                         if (ops->vidioc_s_fmt_type_private)
 863                                 ret = ops->vidioc_s_fmt_type_private(file,
 864                                                                 fh, f);
 865                         break;
 866                 }
 867                 break;
 868         }
 869         case VIDIOC_TRY_FMT:
 870         {
 871                 struct v4l2_format *f = (struct v4l2_format *)arg;
 872
 873                 /* FIXME: Should be one dump per type */
 874                 dbgarg(cmd, "type=%s\n", prt_names(f->type,
 875                                                 v4l2_type_names));
 876                 switch (f->type) {
 877                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 878                         CLEAR_AFTER_FIELD(f, fmt.pix);
 879                         if (ops->vidioc_try_fmt_vid_cap)
 880                                 ret = ops->vidioc_try_fmt_vid_cap(file, fh, f);
 881                         if (!ret)
 882                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 883                         break;
 884                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 885                         CLEAR_AFTER_FIELD(f, fmt.win);
 886                         if (ops->vidioc_try_fmt_vid_overlay)
 887                                 ret = ops->vidioc_try_fmt_vid_overlay(file,
 888                                         fh, f);
 889                         break;
 890                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 891                         CLEAR_AFTER_FIELD(f, fmt.pix);
 892                         if (ops->vidioc_try_fmt_vid_out)
 893                                 ret = ops->vidioc_try_fmt_vid_out(file, fh, f);
 894                         if (!ret)
 895                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 896                         break;
 897                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 898                         CLEAR_AFTER_FIELD(f, fmt.win);
 899                         if (ops->vidioc_try_fmt_vid_out_overlay)
 900                                 ret = ops->vidioc_try_fmt_vid_out_overlay(file,
 901                                        fh, f);
 902                         break;
 903                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 904                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 905                         if (ops->vidioc_try_fmt_vbi_cap)
 906                                 ret = ops->vidioc_try_fmt_vbi_cap(file, fh, f);
 907                         break;
 908                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 909                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 910                         if (ops->vidioc_try_fmt_vbi_out)
 911                                 ret = ops->vidioc_try_fmt_vbi_out(file, fh, f);
 912                         break;
 913                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 914                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 915                         if (ops->vidioc_try_fmt_sliced_vbi_cap)
 916                                 ret = ops->vidioc_try_fmt_sliced_vbi_cap(file,
 917                                                                 fh, f);
 918                         break;
 919                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 920                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 921                         if (ops->vidioc_try_fmt_sliced_vbi_out)
 922                                 ret = ops->vidioc_try_fmt_sliced_vbi_out(file,
 923                                                                 fh, f);
 924                         break;
 925                 case V4L2_BUF_TYPE_PRIVATE:
 926                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
 927                         if (ops->vidioc_try_fmt_type_private)
 928                                 ret = ops->vidioc_try_fmt_type_private(file,
 929                                                                 fh, f);
 930                         break;
 931                 }
 932
 933                 break;
 934         }
 935         /* FIXME: Those buf reqs could be handled here,
 936            with some changes on videobuf to allow its header to be included at
 937            videodev2.h or being merged at videodev2.
 938          */
 939         case VIDIOC_REQBUFS:
 940         {
 941                 struct v4l2_requestbuffers *p = arg;
 942
 943                 if (!ops->vidioc_reqbufs)
 944                         break;
 945                 ret = check_fmt(ops, p->type);
 946                 if (ret)
 947                         break;
 948
 949                 if (p->type < V4L2_BUF_TYPE_PRIVATE)
 950                         CLEAR_AFTER_FIELD(p, memory);
 951
 952                 ret = ops->vidioc_reqbufs(file, fh, p);
 953                 dbgarg(cmd, "count=%d, type=%s, memory=%s\n",
 954                                 p->count,
 955                                 prt_names(p->type, v4l2_type_names),
 956                                 prt_names(p->memory, v4l2_memory_names));
 957                 break;
 958         }
 959         case VIDIOC_QUERYBUF:
 960         {
 961                 struct v4l2_buffer *p = arg;
 962
 963                 if (!ops->vidioc_querybuf)
 964                         break;
 965                 ret = check_fmt(ops, p->type);
 966                 if (ret)
 967                         break;
 968
 969                 ret = ops->vidioc_querybuf(file, fh, p);
 970                 if (!ret)
 971                         dbgbuf(cmd, vfd, p);
 972                 break;
 973         }
 974         case VIDIOC_QBUF:
 975         {
 976                 struct v4l2_buffer *p = arg;
 977
 978                 if (!ops->vidioc_qbuf)
 979                         break;
 980                 ret = check_fmt(ops, p->type);
 981                 if (ret)
 982                         break;
 983
 984                 ret = ops->vidioc_qbuf(file, fh, p);
 985                 if (!ret)
 986                         dbgbuf(cmd, vfd, p);
 987                 break;
 988         }
 989         case VIDIOC_DQBUF:
 990         {
 991                 struct v4l2_buffer *p = arg;
 992
 993                 if (!ops->vidioc_dqbuf)
 994                         break;
 995                 ret = check_fmt(ops, p->type);
 996                 if (ret)
 997                         break;
 998
 999                 ret = ops->vidioc_dqbuf(file, fh, p);
1000                 if (!ret)
1001                         dbgbuf(cmd, vfd, p);
1002                 break;
1003         }
1004         case VIDIOC_OVERLAY:
1005         {
1006                 int *i = arg;
1007
1008                 if (!ops->vidioc_overlay)
1009                         break;
1010                 dbgarg(cmd, "value=%d\n", *i);
1011                 ret = ops->vidioc_overlay(file, fh, *i);
1012                 break;
1013         }
1014         case VIDIOC_G_FBUF:
1015         {
1016                 struct v4l2_framebuffer *p = arg;
1017
1018                 if (!ops->vidioc_g_fbuf)
1019                         break;
1020                 ret = ops->vidioc_g_fbuf(file, fh, arg);
1021                 if (!ret) {
1022                         dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
1023                                         p->capability, p->flags,
1024                                         (unsigned long)p->base);
1025                         v4l_print_pix_fmt(vfd, &p->fmt);
1026                 }
1027                 break;
1028         }
1029         case VIDIOC_S_FBUF:
1030         {
1031                 struct v4l2_framebuffer *p = arg;
1032
1033                 if (!ops->vidioc_s_fbuf)
1034                         break;
1035                 dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
1036                         p->capability, p->flags, (unsigned long)p->base);
1037                 v4l_print_pix_fmt(vfd, &p->fmt);
1038                 ret = ops->vidioc_s_fbuf(file, fh, arg);
1039                 break;
1040         }
1041         case VIDIOC_STREAMON:
1042         {
1043                 enum v4l2_buf_type i = *(int *)arg;
1044
1045                 if (!ops->vidioc_streamon)
1046                         break;
1047                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1048                 ret = ops->vidioc_streamon(file, fh, i);
1049                 break;
1050         }
1051         case VIDIOC_STREAMOFF:
1052         {
1053                 enum v4l2_buf_type i = *(int *)arg;
1054
1055                 if (!ops->vidioc_streamoff)
1056                         break;
1057                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1058                 ret = ops->vidioc_streamoff(file, fh, i);
1059                 break;
1060         }
1061         /* ---------- tv norms ---------- */
1062         case VIDIOC_ENUMSTD:
1063         {
1064                 struct v4l2_standard *p = arg;
1065                 v4l2_std_id id = vfd->tvnorms, curr_id = 0;
1066                 unsigned int index = p->index, i, j = 0;
1067                 const char *descr = "";
1068
1069                 /* Return norm array in a canonical way */
1070                 for (i = 0; i <= index && id; i++) {
1071                         /* last std value in the standards array is 0, so this
1072                            while always ends there since (id & 0) == 0. */
1073                         while ((id & standards[j].std) != standards[j].std)
1074                                 j++;
1075                         curr_id = standards[j].std;
1076                         descr = standards[j].descr;
1077                         j++;
1078                         if (curr_id == 0)
1079                                 break;
1080                         if (curr_id != V4L2_STD_PAL &&
1081                             curr_id != V4L2_STD_SECAM &&
1082                             curr_id != V4L2_STD_NTSC)
1083                                 id &= ~curr_id;
1084                 }
1085                 if (i <= index)
1086                         break;
1087
1088                 v4l2_video_std_construct(p, curr_id, descr);
1089
1090                 dbgarg(cmd, "index=%d, id=0x%Lx, name=%s, fps=%d/%d, "
1091                                 "framelines=%d\n", p->index,
1092                                 (unsigned long long)p->id, p->name,
1093                                 p->frameperiod.numerator,
1094                                 p->frameperiod.denominator,
1095                                 p->framelines);
1096
1097                 ret = 0;
1098                 break;
1099         }
1100         case VIDIOC_G_STD:
1101         {
1102                 v4l2_std_id *id = arg;
1103
1104                 ret = 0;
1105                 /* Calls the specific handler */
1106                 if (ops->vidioc_g_std)
1107                         ret = ops->vidioc_g_std(file, fh, id);
1108                 else if (vfd->current_norm)
1109                         *id = vfd->current_norm;
1110                 else
1111                         ret = -EINVAL;
1112
1113                 if (!ret)
1114                         dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
1115                 break;
1116         }
1117         case VIDIOC_S_STD:
1118         {
1119                 v4l2_std_id *id = arg, norm;
1120
1121                 dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id);
1122
1123                 norm = (*id) & vfd->tvnorms;
1124                 if (vfd->tvnorms && !norm)      /* Check if std is supported */
1125                         break;
1126
1127                 /* Calls the specific handler */
1128                 if (ops->vidioc_s_std)
1129                         ret = ops->vidioc_s_std(file, fh, &norm);
1130                 else
1131                         ret = -EINVAL;
1132
1133                 /* Updates standard information */
1134                 if (ret >= 0)
1135                         vfd->current_norm = norm;
1136                 break;
1137         }
1138         case VIDIOC_QUERYSTD:
1139         {
1140                 v4l2_std_id *p = arg;
1141
1142                 if (!ops->vidioc_querystd)
1143                         break;
1144                 ret = ops->vidioc_querystd(file, fh, arg);
1145                 if (!ret)
1146                         dbgarg(cmd, "detected std=%08Lx\n",
1147                                                 (unsigned long long)*p);
1148                 break;
1149         }
1150         /* ------ input switching ---------- */
1151         /* FIXME: Inputs can be handled inside videodev2 */
1152         case VIDIOC_ENUMINPUT:
1153         {
1154                 struct v4l2_input *p = arg;
1155
1156                 /*
1157                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1158                  * CAP_STD here based on ioctl handler provided by the
1159                  * driver. If the driver doesn't support these
1160                  * for a specific input, it must override these flags.
1161                  */
1162                 if (ops->vidioc_s_std)
1163                         p->capabilities |= V4L2_IN_CAP_STD;
1164                 if (ops->vidioc_s_dv_preset)
1165                         p->capabilities |= V4L2_IN_CAP_PRESETS;
1166                 if (ops->vidioc_s_dv_timings)
1167                         p->capabilities |= V4L2_IN_CAP_CUSTOM_TIMINGS;
1168
1169                 if (!ops->vidioc_enum_input)
1170                         break;
1171
1172                 ret = ops->vidioc_enum_input(file, fh, p);
1173                 if (!ret)
1174                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1175                                 "audioset=%d, "
1176                                 "tuner=%d, std=%08Lx, status=%d\n",
1177                                 p->index, p->name, p->type, p->audioset,
1178                                 p->tuner,
1179                                 (unsigned long long)p->std,
1180                                 p->status);
1181                 break;
1182         }
1183         case VIDIOC_G_INPUT:
1184         {
1185                 unsigned int *i = arg;
1186
1187                 if (!ops->vidioc_g_input)
1188                         break;
1189                 ret = ops->vidioc_g_input(file, fh, i);
1190                 if (!ret)
1191                         dbgarg(cmd, "value=%d\n", *i);
1192                 break;
1193         }
1194         case VIDIOC_S_INPUT:
1195         {
1196                 unsigned int *i = arg;
1197
1198                 if (!ops->vidioc_s_input)
1199                         break;
1200                 dbgarg(cmd, "value=%d\n", *i);
1201                 ret = ops->vidioc_s_input(file, fh, *i);
1202                 break;
1203         }
1204
1205         /* ------ output switching ---------- */
1206         case VIDIOC_ENUMOUTPUT:
1207         {
1208                 struct v4l2_output *p = arg;
1209
1210                 if (!ops->vidioc_enum_output)
1211                         break;
1212
1213                 /*
1214                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1215                  * CAP_STD here based on ioctl handler provided by the
1216                  * driver. If the driver doesn't support these
1217                  * for a specific output, it must override these flags.
1218                  */
1219                 if (ops->vidioc_s_std)
1220                         p->capabilities |= V4L2_OUT_CAP_STD;
1221                 if (ops->vidioc_s_dv_preset)
1222                         p->capabilities |= V4L2_OUT_CAP_PRESETS;
1223                 if (ops->vidioc_s_dv_timings)
1224                         p->capabilities |= V4L2_OUT_CAP_CUSTOM_TIMINGS;
1225
1226                 ret = ops->vidioc_enum_output(file, fh, p);
1227                 if (!ret)
1228                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1229                                 "audioset=0x%x, "
1230                                 "modulator=%d, std=0x%08Lx\n",
1231                                 p->index, p->name, p->type, p->audioset,
1232                                 p->modulator, (unsigned long long)p->std);
1233                 break;
1234         }
1235         case VIDIOC_G_OUTPUT:
1236         {
1237                 unsigned int *i = arg;
1238
1239                 if (!ops->vidioc_g_output)
1240                         break;
1241                 ret = ops->vidioc_g_output(file, fh, i);
1242                 if (!ret)
1243                         dbgarg(cmd, "value=%d\n", *i);
1244                 break;
1245         }
1246         case VIDIOC_S_OUTPUT:
1247         {
1248                 unsigned int *i = arg;
1249
1250                 if (!ops->vidioc_s_output)
1251                         break;
1252                 dbgarg(cmd, "value=%d\n", *i);
1253                 ret = ops->vidioc_s_output(file, fh, *i);
1254                 break;
1255         }
1256
1257         /* --- controls ---------------------------------------------- */
1258         case VIDIOC_QUERYCTRL:
1259         {
1260                 struct v4l2_queryctrl *p = arg;
1261
1262                 if (!ops->vidioc_queryctrl)
1263                         break;
1264                 ret = ops->vidioc_queryctrl(file, fh, p);
1265                 if (!ret)
1266                         dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, "
1267                                         "step=%d, default=%d, flags=0x%08x\n",
1268                                         p->id, p->type, p->name,
1269                                         p->minimum, p->maximum,
1270                                         p->step, p->default_value, p->flags);
1271                 else
1272                         dbgarg(cmd, "id=0x%x\n", p->id);
1273                 break;
1274         }
1275         case VIDIOC_G_CTRL:
1276         {
1277                 struct v4l2_control *p = arg;
1278
1279                 if (ops->vidioc_g_ctrl)
1280                         ret = ops->vidioc_g_ctrl(file, fh, p);
1281                 else if (ops->vidioc_g_ext_ctrls) {
1282                         struct v4l2_ext_controls ctrls;
1283                         struct v4l2_ext_control ctrl;
1284
1285                         ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1286                         ctrls.count = 1;
1287                         ctrls.controls = &ctrl;
1288                         ctrl.id = p->id;
1289                         ctrl.value = p->value;
1290                         if (check_ext_ctrls(&ctrls, 1)) {
1291                                 ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
1292                                 if (ret == 0)
1293                                         p->value = ctrl.value;
1294                         }
1295                 } else
1296                         break;
1297                 if (!ret)
1298                         dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1299                 else
1300                         dbgarg(cmd, "id=0x%x\n", p->id);
1301                 break;
1302         }
1303         case VIDIOC_S_CTRL:
1304         {
1305                 struct v4l2_control *p = arg;
1306                 struct v4l2_ext_controls ctrls;
1307                 struct v4l2_ext_control ctrl;
1308
1309                 if (!ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
1310                         break;
1311
1312                 dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1313
1314                 if (ops->vidioc_s_ctrl) {
1315                         ret = ops->vidioc_s_ctrl(file, fh, p);
1316                         break;
1317                 }
1318                 if (!ops->vidioc_s_ext_ctrls)
1319                         break;
1320
1321                 ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1322                 ctrls.count = 1;
1323                 ctrls.controls = &ctrl;
1324                 ctrl.id = p->id;
1325                 ctrl.value = p->value;
1326                 if (check_ext_ctrls(&ctrls, 1))
1327                         ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
1328                 break;
1329         }
1330         case VIDIOC_G_EXT_CTRLS:
1331         {
1332                 struct v4l2_ext_controls *p = arg;
1333
1334                 p->error_idx = p->count;
1335                 if (!ops->vidioc_g_ext_ctrls)
1336                         break;
1337                 if (check_ext_ctrls(p, 0))
1338                         ret = ops->vidioc_g_ext_ctrls(file, fh, p);
1339                 v4l_print_ext_ctrls(cmd, vfd, p, !ret);
1340                 break;
1341         }
1342         case VIDIOC_S_EXT_CTRLS:
1343         {
1344                 struct v4l2_ext_controls *p = arg;
1345
1346                 p->error_idx = p->count;
1347                 if (!ops->vidioc_s_ext_ctrls)
1348                         break;
1349                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1350                 if (check_ext_ctrls(p, 0))
1351                         ret = ops->vidioc_s_ext_ctrls(file, fh, p);
1352                 break;
1353         }
1354         case VIDIOC_TRY_EXT_CTRLS:
1355         {
1356                 struct v4l2_ext_controls *p = arg;
1357
1358                 p->error_idx = p->count;
1359                 if (!ops->vidioc_try_ext_ctrls)
1360                         break;
1361                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1362                 if (check_ext_ctrls(p, 0))
1363                         ret = ops->vidioc_try_ext_ctrls(file, fh, p);
1364                 break;
1365         }
1366         case VIDIOC_QUERYMENU:
1367         {
1368                 struct v4l2_querymenu *p = arg;
1369
1370                 if (!ops->vidioc_querymenu)
1371                         break;
1372                 ret = ops->vidioc_querymenu(file, fh, p);
1373                 if (!ret)
1374                         dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
1375                                 p->id, p->index, p->name);
1376                 else
1377                         dbgarg(cmd, "id=0x%x, index=%d\n",
1378                                 p->id, p->index);
1379                 break;
1380         }
1381         /* --- audio ---------------------------------------------- */
1382         case VIDIOC_ENUMAUDIO:
1383         {
1384                 struct v4l2_audio *p = arg;
1385
1386                 if (!ops->vidioc_enumaudio)
1387                         break;
1388                 ret = ops->vidioc_enumaudio(file, fh, p);
1389                 if (!ret)
1390                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1391                                         "mode=0x%x\n", p->index, p->name,
1392                                         p->capability, p->mode);
1393                 else
1394                         dbgarg(cmd, "index=%d\n", p->index);
1395                 break;
1396         }
1397         case VIDIOC_G_AUDIO:
1398         {
1399                 struct v4l2_audio *p = arg;
1400
1401                 if (!ops->vidioc_g_audio)
1402                         break;
1403
1404                 ret = ops->vidioc_g_audio(file, fh, p);
1405                 if (!ret)
1406                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1407                                         "mode=0x%x\n", p->index,
1408                                         p->name, p->capability, p->mode);
1409                 else
1410                         dbgarg(cmd, "index=%d\n", p->index);
1411                 break;
1412         }
1413         case VIDIOC_S_AUDIO:
1414         {
1415                 struct v4l2_audio *p = arg;
1416
1417                 if (!ops->vidioc_s_audio)
1418                         break;
1419                 dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1420                                         "mode=0x%x\n", p->index, p->name,
1421                                         p->capability, p->mode);
1422                 ret = ops->vidioc_s_audio(file, fh, p);
1423                 break;
1424         }
1425         case VIDIOC_ENUMAUDOUT:
1426         {
1427                 struct v4l2_audioout *p = arg;
1428
1429                 if (!ops->vidioc_enumaudout)
1430                         break;
1431                 dbgarg(cmd, "Enum for index=%d\n", p->index);
1432                 ret = ops->vidioc_enumaudout(file, fh, p);
1433                 if (!ret)
1434                         dbgarg2("index=%d, name=%s, capability=%d, "
1435                                         "mode=%d\n", p->index, p->name,
1436                                         p->capability, p->mode);
1437                 break;
1438         }
1439         case VIDIOC_G_AUDOUT:
1440         {
1441                 struct v4l2_audioout *p = arg;
1442
1443                 if (!ops->vidioc_g_audout)
1444                         break;
1445
1446                 ret = ops->vidioc_g_audout(file, fh, p);
1447                 if (!ret)
1448                         dbgarg2("index=%d, name=%s, capability=%d, "
1449                                         "mode=%d\n", p->index, p->name,
1450                                         p->capability, p->mode);
1451                 break;
1452         }
1453         case VIDIOC_S_AUDOUT:
1454         {
1455                 struct v4l2_audioout *p = arg;
1456
1457                 if (!ops->vidioc_s_audout)
1458                         break;
1459                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1460                                         "mode=%d\n", p->index, p->name,
1461                                         p->capability, p->mode);
1462
1463                 ret = ops->vidioc_s_audout(file, fh, p);
1464                 break;
1465         }
1466         case VIDIOC_G_MODULATOR:
1467         {
1468                 struct v4l2_modulator *p = arg;
1469
1470                 if (!ops->vidioc_g_modulator)
1471                         break;
1472                 ret = ops->vidioc_g_modulator(file, fh, p);
1473                 if (!ret)
1474                         dbgarg(cmd, "index=%d, name=%s, "
1475                                         "capability=%d, rangelow=%d,"
1476                                         " rangehigh=%d, txsubchans=%d\n",
1477                                         p->index, p->name, p->capability,
1478                                         p->rangelow, p->rangehigh,
1479                                         p->txsubchans);
1480                 break;
1481         }
1482         case VIDIOC_S_MODULATOR:
1483         {
1484                 struct v4l2_modulator *p = arg;
1485
1486                 if (!ops->vidioc_s_modulator)
1487                         break;
1488                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1489                                 "rangelow=%d, rangehigh=%d, txsubchans=%d\n",
1490                                 p->index, p->name, p->capability, p->rangelow,
1491                                 p->rangehigh, p->txsubchans);
1492                         ret = ops->vidioc_s_modulator(file, fh, p);
1493                 break;
1494         }
1495         case VIDIOC_G_CROP:
1496         {
1497                 struct v4l2_crop *p = arg;
1498
1499                 if (!ops->vidioc_g_crop)
1500                         break;
1501
1502                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1503                 ret = ops->vidioc_g_crop(file, fh, p);
1504                 if (!ret)
1505                         dbgrect(vfd, "", &p->c);
1506                 break;
1507         }
1508         case VIDIOC_S_CROP:
1509         {
1510                 struct v4l2_crop *p = arg;
1511
1512                 if (!ops->vidioc_s_crop)
1513                         break;
1514                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1515                 dbgrect(vfd, "", &p->c);
1516                 ret = ops->vidioc_s_crop(file, fh, p);
1517                 break;
1518         }
1519         case VIDIOC_CROPCAP:
1520         {
1521                 struct v4l2_cropcap *p = arg;
1522
1523                 /*FIXME: Should also show v4l2_fract pixelaspect */
1524                 if (!ops->vidioc_cropcap)
1525                         break;
1526
1527                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1528                 ret = ops->vidioc_cropcap(file, fh, p);
1529                 if (!ret) {
1530                         dbgrect(vfd, "bounds ", &p->bounds);
1531                         dbgrect(vfd, "defrect ", &p->defrect);
1532                 }
1533                 break;
1534         }
1535         case VIDIOC_G_JPEGCOMP:
1536         {
1537                 struct v4l2_jpegcompression *p = arg;
1538
1539                 if (!ops->vidioc_g_jpegcomp)
1540                         break;
1541
1542                 ret = ops->vidioc_g_jpegcomp(file, fh, p);
1543                 if (!ret)
1544                         dbgarg(cmd, "quality=%d, APPn=%d, "
1545                                         "APP_len=%d, COM_len=%d, "
1546                                         "jpeg_markers=%d\n",
1547                                         p->quality, p->APPn, p->APP_len,
1548                                         p->COM_len, p->jpeg_markers);
1549                 break;
1550         }
1551         case VIDIOC_S_JPEGCOMP:
1552         {
1553                 struct v4l2_jpegcompression *p = arg;
1554
1555                 if (!ops->vidioc_g_jpegcomp)
1556                         break;
1557                 dbgarg(cmd, "quality=%d, APPn=%d, APP_len=%d, "
1558                                         "COM_len=%d, jpeg_markers=%d\n",
1559                                         p->quality, p->APPn, p->APP_len,
1560                                         p->COM_len, p->jpeg_markers);
1561                         ret = ops->vidioc_s_jpegcomp(file, fh, p);
1562                 break;
1563         }
1564         case VIDIOC_G_ENC_INDEX:
1565         {
1566                 struct v4l2_enc_idx *p = arg;
1567
1568                 if (!ops->vidioc_g_enc_index)
1569                         break;
1570                 ret = ops->vidioc_g_enc_index(file, fh, p);
1571                 if (!ret)
1572                         dbgarg(cmd, "entries=%d, entries_cap=%d\n",
1573                                         p->entries, p->entries_cap);
1574                 break;
1575         }
1576         case VIDIOC_ENCODER_CMD:
1577         {
1578                 struct v4l2_encoder_cmd *p = arg;
1579
1580                 if (!ops->vidioc_encoder_cmd)
1581                         break;
1582                 ret = ops->vidioc_encoder_cmd(file, fh, p);
1583                 if (!ret)
1584                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1585                 break;
1586         }
1587         case VIDIOC_TRY_ENCODER_CMD:
1588         {
1589                 struct v4l2_encoder_cmd *p = arg;
1590
1591                 if (!ops->vidioc_try_encoder_cmd)
1592                         break;
1593                 ret = ops->vidioc_try_encoder_cmd(file, fh, p);
1594                 if (!ret)
1595                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1596                 break;
1597         }
1598         case VIDIOC_G_PARM:
1599         {
1600                 struct v4l2_streamparm *p = arg;
1601
1602                 if (ops->vidioc_g_parm) {
1603                         ret = check_fmt(ops, p->type);
1604                         if (ret)
1605                                 break;
1606                         ret = ops->vidioc_g_parm(file, fh, p);
1607                 } else {
1608                         v4l2_std_id std = vfd->current_norm;
1609
1610                         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1611                                 break;
1612
1613                         ret = 0;
1614                         if (ops->vidioc_g_std)
1615                                 ret = ops->vidioc_g_std(file, fh, &std);
1616                         else if (std == 0)
1617                                 ret = -EINVAL;
1618                         if (ret == 0)
1619                                 v4l2_video_std_frame_period(std,
1620                                                     &p->parm.capture.timeperframe);
1621                 }
1622
1623                 dbgarg(cmd, "type=%d\n", p->type);
1624                 break;
1625         }
1626         case VIDIOC_S_PARM:
1627         {
1628                 struct v4l2_streamparm *p = arg;
1629
1630                 if (!ops->vidioc_s_parm)
1631                         break;
1632                 ret = check_fmt(ops, p->type);
1633                 if (ret)
1634                         break;
1635
1636                 dbgarg(cmd, "type=%d\n", p->type);
1637                 ret = ops->vidioc_s_parm(file, fh, p);
1638                 break;
1639         }
1640         case VIDIOC_G_TUNER:
1641         {
1642                 struct v4l2_tuner *p = arg;
1643
1644                 if (!ops->vidioc_g_tuner)
1645                         break;
1646
1647                 ret = ops->vidioc_g_tuner(file, fh, p);
1648                 if (!ret)
1649                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1650                                         "capability=0x%x, rangelow=%d, "
1651                                         "rangehigh=%d, signal=%d, afc=%d, "
1652                                         "rxsubchans=0x%x, audmode=%d\n",
1653                                         p->index, p->name, p->type,
1654                                         p->capability, p->rangelow,
1655                                         p->rangehigh, p->signal, p->afc,
1656                                         p->rxsubchans, p->audmode);
1657                 break;
1658         }
1659         case VIDIOC_S_TUNER:
1660         {
1661                 struct v4l2_tuner *p = arg;
1662
1663                 if (!ops->vidioc_s_tuner)
1664                         break;
1665                 dbgarg(cmd, "index=%d, name=%s, type=%d, "
1666                                 "capability=0x%x, rangelow=%d, "
1667                                 "rangehigh=%d, signal=%d, afc=%d, "
1668                                 "rxsubchans=0x%x, audmode=%d\n",
1669                                 p->index, p->name, p->type,
1670                                 p->capability, p->rangelow,
1671                                 p->rangehigh, p->signal, p->afc,
1672                                 p->rxsubchans, p->audmode);
1673                 ret = ops->vidioc_s_tuner(file, fh, p);
1674                 break;
1675         }
1676         case VIDIOC_G_FREQUENCY:
1677         {
1678                 struct v4l2_frequency *p = arg;
1679
1680                 if (!ops->vidioc_g_frequency)
1681                         break;
1682
1683                 ret = ops->vidioc_g_frequency(file, fh, p);
1684                 if (!ret)
1685                         dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1686                                         p->tuner, p->type, p->frequency);
1687                 break;
1688         }
1689         case VIDIOC_S_FREQUENCY:
1690         {
1691                 struct v4l2_frequency *p = arg;
1692
1693                 if (!ops->vidioc_s_frequency)
1694                         break;
1695                 dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1696                                 p->tuner, p->type, p->frequency);
1697                 ret = ops->vidioc_s_frequency(file, fh, p);
1698                 break;
1699         }
1700         case VIDIOC_G_SLICED_VBI_CAP:
1701         {
1702                 struct v4l2_sliced_vbi_cap *p = arg;
1703
1704                 if (!ops->vidioc_g_sliced_vbi_cap)
1705                         break;
1706
1707                 /* Clear up to type, everything after type is zerod already */
1708                 memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
1709
1710                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1711                 ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);
1712                 if (!ret)
1713                         dbgarg2("service_set=%d\n", p->service_set);
1714                 break;
1715         }
1716         case VIDIOC_LOG_STATUS:
1717         {
1718                 if (!ops->vidioc_log_status)
1719                         break;
1720                 ret = ops->vidioc_log_status(file, fh);
1721                 break;
1722         }
1723 #ifdef CONFIG_VIDEO_ADV_DEBUG
1724         case VIDIOC_DBG_G_REGISTER:
1725         {
1726                 struct v4l2_dbg_register *p = arg;
1727
1728                 if (!capable(CAP_SYS_ADMIN))
1729                         ret = -EPERM;
1730                 else if (ops->vidioc_g_register)
1731                         ret = ops->vidioc_g_register(file, fh, p);
1732                 break;
1733         }
1734         case VIDIOC_DBG_S_REGISTER:
1735         {
1736                 struct v4l2_dbg_register *p = arg;
1737
1738                 if (!capable(CAP_SYS_ADMIN))
1739                         ret = -EPERM;
1740                 else if (ops->vidioc_s_register)
1741                         ret = ops->vidioc_s_register(file, fh, p);
1742                 break;
1743         }
1744 #endif
1745         case VIDIOC_DBG_G_CHIP_IDENT:
1746         {
1747                 struct v4l2_dbg_chip_ident *p = arg;
1748
1749                 if (!ops->vidioc_g_chip_ident)
1750                         break;
1751                 p->ident = V4L2_IDENT_NONE;
1752                 p->revision = 0;
1753                 ret = ops->vidioc_g_chip_ident(file, fh, p);
1754                 if (!ret)
1755                         dbgarg(cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
1756                 break;
1757         }
1758         case VIDIOC_S_HW_FREQ_SEEK:
1759         {
1760                 struct v4l2_hw_freq_seek *p = arg;
1761
1762                 if (!ops->vidioc_s_hw_freq_seek)
1763                         break;
1764                 dbgarg(cmd,
1765                         "tuner=%d, type=%d, seek_upward=%d, wrap_around=%d\n",
1766                         p->tuner, p->type, p->seek_upward, p->wrap_around);
1767                 ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
1768                 break;
1769         }
1770         case VIDIOC_ENUM_FRAMESIZES:
1771         {
1772                 struct v4l2_frmsizeenum *p = arg;
1773
1774                 if (!ops->vidioc_enum_framesizes)
1775                         break;
1776
1777                 ret = ops->vidioc_enum_framesizes(file, fh, p);
1778                 dbgarg(cmd,
1779                         "index=%d, pixelformat=%c%c%c%c, type=%d ",
1780                         p->index,
1781                         (p->pixel_format & 0xff),
1782                         (p->pixel_format >>  8) & 0xff,
1783                         (p->pixel_format >> 16) & 0xff,
1784                         (p->pixel_format >> 24) & 0xff,
1785                         p->type);
1786                 switch (p->type) {
1787                 case V4L2_FRMSIZE_TYPE_DISCRETE:
1788                         dbgarg3("width = %d, height=%d\n",
1789                                 p->discrete.width, p->discrete.height);
1790                         break;
1791                 case V4L2_FRMSIZE_TYPE_STEPWISE:
1792                         dbgarg3("min %dx%d, max %dx%d, step %dx%d\n",
1793                                 p->stepwise.min_width,  p->stepwise.min_height,
1794                                 p->stepwise.step_width, p->stepwise.step_height,
1795                                 p->stepwise.max_width,  p->stepwise.max_height);
1796                         break;
1797                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1798                         dbgarg3("continuous\n");
1799                         break;
1800                 default:
1801                         dbgarg3("- Unknown type!\n");
1802                 }
1803
1804                 break;
1805         }
1806         case VIDIOC_ENUM_FRAMEINTERVALS:
1807         {
1808                 struct v4l2_frmivalenum *p = arg;
1809
1810                 if (!ops->vidioc_enum_frameintervals)
1811                         break;
1812
1813                 ret = ops->vidioc_enum_frameintervals(file, fh, p);
1814                 dbgarg(cmd,
1815                         "index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
1816                         p->index, p->pixel_format,
1817                         p->width, p->height, p->type);
1818                 switch (p->type) {
1819                 case V4L2_FRMIVAL_TYPE_DISCRETE:
1820                         dbgarg2("fps=%d/%d\n",
1821                                 p->discrete.numerator,
1822                                 p->discrete.denominator);
1823                         break;
1824                 case V4L2_FRMIVAL_TYPE_STEPWISE:
1825                         dbgarg2("min=%d/%d, max=%d/%d, step=%d/%d\n",
1826                                 p->stepwise.min.numerator,
1827                                 p->stepwise.min.denominator,
1828                                 p->stepwise.max.numerator,
1829                                 p->stepwise.max.denominator,
1830                                 p->stepwise.step.numerator,
1831                                 p->stepwise.step.denominator);
1832                         break;
1833                 case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1834                         dbgarg2("continuous\n");
1835                         break;
1836                 default:
1837                         dbgarg2("- Unknown type!\n");
1838                 }
1839                 break;
1840         }
1841         case VIDIOC_ENUM_DV_PRESETS:
1842         {
1843                 struct v4l2_dv_enum_preset *p = arg;
1844
1845                 if (!ops->vidioc_enum_dv_presets)
1846                         break;
1847
1848                 ret = ops->vidioc_enum_dv_presets(file, fh, p);
1849                 if (!ret)
1850                         dbgarg(cmd,
1851                                 "index=%d, preset=%d, name=%s, width=%d,"
1852                                 " height=%d ",
1853                                 p->index, p->preset, p->name, p->width,
1854                                 p->height);
1855                 break;
1856         }
1857         case VIDIOC_S_DV_PRESET:
1858         {
1859                 struct v4l2_dv_preset *p = arg;
1860
1861                 if (!ops->vidioc_s_dv_preset)
1862                         break;
1863
1864                 dbgarg(cmd, "preset=%d\n", p->preset);
1865                 ret = ops->vidioc_s_dv_preset(file, fh, p);
1866                 break;
1867         }
1868         case VIDIOC_G_DV_PRESET:
1869         {
1870                 struct v4l2_dv_preset *p = arg;
1871
1872                 if (!ops->vidioc_g_dv_preset)
1873                         break;
1874
1875                 ret = ops->vidioc_g_dv_preset(file, fh, p);
1876                 if (!ret)
1877                         dbgarg(cmd, "preset=%d\n", p->preset);
1878                 break;
1879         }
1880         case VIDIOC_QUERY_DV_PRESET:
1881         {
1882                 struct v4l2_dv_preset *p = arg;
1883
1884                 if (!ops->vidioc_query_dv_preset)
1885                         break;
1886
1887                 ret = ops->vidioc_query_dv_preset(file, fh, p);
1888                 if (!ret)
1889                         dbgarg(cmd, "preset=%d\n", p->preset);
1890                 break;
1891         }
1892         case VIDIOC_S_DV_TIMINGS:
1893         {
1894                 struct v4l2_dv_timings *p = arg;
1895
1896                 if (!ops->vidioc_s_dv_timings)
1897                         break;
1898
1899                 switch (p->type) {
1900                 case V4L2_DV_BT_656_1120:
1901                         dbgarg2("bt-656/1120:interlaced=%d, pixelclock=%lld,"
1902                                 " width=%d, height=%d, polarities=%x,"
1903                                 " hfrontporch=%d, hsync=%d, hbackporch=%d,"
1904                                 " vfrontporch=%d, vsync=%d, vbackporch=%d,"
1905                                 " il_vfrontporch=%d, il_vsync=%d,"
1906                                 " il_vbackporch=%d\n",
1907                                 p->bt.interlaced, p->bt.pixelclock,
1908                                 p->bt.width, p->bt.height, p->bt.polarities,
1909                                 p->bt.hfrontporch, p->bt.hsync,
1910                                 p->bt.hbackporch, p->bt.vfrontporch,
1911                                 p->bt.vsync, p->bt.vbackporch,
1912                                 p->bt.il_vfrontporch, p->bt.il_vsync,
1913                                 p->bt.il_vbackporch);
1914                         ret = ops->vidioc_s_dv_timings(file, fh, p);
1915                         break;
1916                 default:
1917                         dbgarg2("Unknown type %d!\n", p->type);
1918                         break;
1919                 }
1920                 break;
1921         }
1922         case VIDIOC_G_DV_TIMINGS:
1923         {
1924                 struct v4l2_dv_timings *p = arg;
1925
1926                 if (!ops->vidioc_g_dv_timings)
1927                         break;
1928
1929                 ret = ops->vidioc_g_dv_timings(file, fh, p);
1930                 if (!ret) {
1931                         switch (p->type) {
1932                         case V4L2_DV_BT_656_1120:
1933                                 dbgarg2("bt-656/1120:interlaced=%d,"
1934                                         " pixelclock=%lld,"
1935                                         " width=%d, height=%d, polarities=%x,"
1936                                         " hfrontporch=%d, hsync=%d,"
1937                                         " hbackporch=%d, vfrontporch=%d,"
1938                                         " vsync=%d, vbackporch=%d,"
1939                                         " il_vfrontporch=%d, il_vsync=%d,"
1940                                         " il_vbackporch=%d\n",
1941                                         p->bt.interlaced, p->bt.pixelclock,
1942                                         p->bt.width, p->bt.height,
1943                                         p->bt.polarities, p->bt.hfrontporch,
1944                                         p->bt.hsync, p->bt.hbackporch,
1945                                         p->bt.vfrontporch, p->bt.vsync,
1946                                         p->bt.vbackporch, p->bt.il_vfrontporch,
1947                                         p->bt.il_vsync, p->bt.il_vbackporch);
1948                                 break;
1949                         default:
1950                                 dbgarg2("Unknown type %d!\n", p->type);
1951                                 break;
1952                         }
1953                 }
1954                 break;
1955         }
1956         case VIDIOC_DQEVENT:
1957         {
1958                 struct v4l2_event *ev = arg;
1959
1960                 if (!ops->vidioc_subscribe_event)
1961                         break;
1962
1963                 ret = v4l2_event_dequeue(fh, ev, file->f_flags & O_NONBLOCK);
1964                 if (ret < 0) {
1965                         dbgarg(cmd, "no pending events?");
1966                         break;
1967                 }
1968                 dbgarg(cmd,
1969                        "pending=%d, type=0x%8.8x, sequence=%d, "
1970                        "timestamp=%lu.%9.9lu ",
1971                        ev->pending, ev->type, ev->sequence,
1972                        ev->timestamp.tv_sec, ev->timestamp.tv_nsec);
1973                 break;
1974         }
1975         case VIDIOC_SUBSCRIBE_EVENT:
1976         {
1977                 struct v4l2_event_subscription *sub = arg;
1978
1979                 if (!ops->vidioc_subscribe_event)
1980                         break;
1981
1982                 ret = ops->vidioc_subscribe_event(fh, sub);
1983                 if (ret < 0) {
1984                         dbgarg(cmd, "failed, ret=%ld", ret);
1985                         break;
1986                 }
1987                 dbgarg(cmd, "type=0x%8.8x", sub->type);
1988                 break;
1989         }
1990         case VIDIOC_UNSUBSCRIBE_EVENT:
1991         {
1992                 struct v4l2_event_subscription *sub = arg;
1993
1994                 if (!ops->vidioc_unsubscribe_event)
1995                         break;
1996
1997                 ret = ops->vidioc_unsubscribe_event(fh, sub);
1998                 if (ret < 0) {
1999                         dbgarg(cmd, "failed, ret=%ld", ret);
2000                         break;
2001                 }
2002                 dbgarg(cmd, "type=0x%8.8x", sub->type);
2003                 break;
2004         }
2005         default:
2006         {
2007                 if (!ops->vidioc_default)
2008                         break;
2009                 ret = ops->vidioc_default(file, fh, cmd, arg);
2010                 break;
2011         }
2012         } /* switch */
2013
2014         if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
2015                 if (ret < 0) {
2016                         v4l_print_ioctl(vfd->name, cmd);
2017                         printk(KERN_CONT " error %ld\n", ret);
2018                 }
2019         }
2020
2021         return ret;
2022 }
2023
2024 /* In some cases, only a few fields are used as input, i.e. when the app sets
2025  * "index" and then the driver fills in the rest of the structure for the thing
2026  * with that index.  We only need to copy up the first non-input field.  */
2027 static unsigned long cmd_input_size(unsigned int cmd)
2028 {
2029         /* Size of structure up to and including 'field' */
2030 #define CMDINSIZE(cmd, type, field)                             \
2031         case VIDIOC_##cmd:                                      \
2032                 return offsetof(struct v4l2_##type, field) +    \
2033                         sizeof(((struct v4l2_##type *)0)->field);
2034
2035         switch (cmd) {
2036                 CMDINSIZE(ENUM_FMT,             fmtdesc,        type);
2037                 CMDINSIZE(G_FMT,                format,         type);
2038                 CMDINSIZE(QUERYBUF,             buffer,         type);
2039                 CMDINSIZE(G_PARM,               streamparm,     type);
2040                 CMDINSIZE(ENUMSTD,              standard,       index);
2041                 CMDINSIZE(ENUMINPUT,            input,          index);
2042                 CMDINSIZE(G_CTRL,               control,        id);
2043                 CMDINSIZE(G_TUNER,              tuner,          index);
2044                 CMDINSIZE(QUERYCTRL,            queryctrl,      id);
2045                 CMDINSIZE(QUERYMENU,            querymenu,      index);
2046                 CMDINSIZE(ENUMOUTPUT,           output,         index);
2047                 CMDINSIZE(G_MODULATOR,          modulator,      index);
2048                 CMDINSIZE(G_FREQUENCY,          frequency,      tuner);
2049                 CMDINSIZE(CROPCAP,              cropcap,        type);
2050                 CMDINSIZE(G_CROP,               crop,           type);
2051                 CMDINSIZE(ENUMAUDIO,            audio,          index);
2052                 CMDINSIZE(ENUMAUDOUT,           audioout,       index);
2053                 CMDINSIZE(ENCODER_CMD,          encoder_cmd,    flags);
2054                 CMDINSIZE(TRY_ENCODER_CMD,      encoder_cmd,    flags);
2055                 CMDINSIZE(G_SLICED_VBI_CAP,     sliced_vbi_cap, type);
2056                 CMDINSIZE(ENUM_FRAMESIZES,      frmsizeenum,    pixel_format);
2057                 CMDINSIZE(ENUM_FRAMEINTERVALS,  frmivalenum,    height);
2058         default:
2059                 return _IOC_SIZE(cmd);
2060         }
2061 }
2062
2063 long video_ioctl2(struct file *file,
2064                unsigned int cmd, unsigned long arg)
2065 {
2066         char    sbuf[128];
2067         void    *mbuf = NULL;
2068         void    *parg = (void *)arg;
2069         long    err  = -EINVAL;
2070         int     is_ext_ctrl;
2071         size_t  ctrls_size = 0;
2072         void __user *user_ptr = NULL;
2073
2074 #ifdef __OLD_VIDIOC_
2075         cmd = video_fix_command(cmd);
2076 #endif
2077         is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
2078                        cmd == VIDIOC_TRY_EXT_CTRLS);
2079
2080         /*  Copy arguments into temp kernel buffer  */
2081         if (_IOC_DIR(cmd) != _IOC_NONE) {
2082                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
2083                         parg = sbuf;
2084                 } else {
2085                         /* too big to allocate from stack */
2086                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
2087                         if (NULL == mbuf)
2088                                 return -ENOMEM;
2089                         parg = mbuf;
2090                 }
2091
2092                 err = -EFAULT;
2093                 if (_IOC_DIR(cmd) & _IOC_WRITE) {
2094                         unsigned long n = cmd_input_size(cmd);
2095
2096                         if (copy_from_user(parg, (void __user *)arg, n))
2097                                 goto out;
2098
2099                         /* zero out anything we don't copy from userspace */
2100                         if (n < _IOC_SIZE(cmd))
2101                                 memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
2102                 } else {
2103                         /* read-only ioctl */
2104                         memset(parg, 0, _IOC_SIZE(cmd));
2105                 }
2106         }
2107
2108         if (is_ext_ctrl) {
2109                 struct v4l2_ext_controls *p = parg;
2110
2111                 /* In case of an error, tell the caller that it wasn't
2112                    a specific control that caused it. */
2113                 p->error_idx = p->count;
2114                 user_ptr = (void __user *)p->controls;
2115                 if (p->count) {
2116                         ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
2117                         /* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
2118                         mbuf = kmalloc(ctrls_size, GFP_KERNEL);
2119                         err = -ENOMEM;
2120                         if (NULL == mbuf)
2121                                 goto out_ext_ctrl;
2122                         err = -EFAULT;
2123                         if (copy_from_user(mbuf, user_ptr, ctrls_size))
2124                                 goto out_ext_ctrl;
2125                         p->controls = mbuf;
2126                 }
2127         }
2128
2129         /* Handles IOCTL */
2130         err = __video_do_ioctl(file, cmd, parg);
2131         if (err == -ENOIOCTLCMD)
2132                 err = -EINVAL;
2133         if (is_ext_ctrl) {
2134                 struct v4l2_ext_controls *p = parg;
2135
2136                 p->controls = (void *)user_ptr;
2137                 if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
2138                         err = -EFAULT;
2139                 goto out_ext_ctrl;
2140         }
2141         if (err < 0)
2142                 goto out;
2143
2144 out_ext_ctrl:
2145         /*  Copy results into user buffer  */
2146         switch (_IOC_DIR(cmd)) {
2147         case _IOC_READ:
2148         case (_IOC_WRITE | _IOC_READ):
2149                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
2150                         err = -EFAULT;
2151                 break;
2152         }
2153
2154 out:
2155         kfree(mbuf);
2156         return err;
2157 }
2158 EXPORT_SYMBOL(video_ioctl2);