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-ctrls.h>
  30 #include <media/v4l2-fh.h>
  31 #include <media/v4l2-event.h>
  32 #include <media/v4l2-chip-ident.h>
  33
  34 #define dbgarg(cmd, fmt, arg...) \
  35                 do {                                                    \
  36                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {            \
  37                         printk(KERN_DEBUG "%s: ",  vfd->name);          \
  38                         v4l_printk_ioctl(cmd);                          \
  39                         printk(" " fmt,  ## arg);                       \
  40                     }                                                   \
  41                 } while (0)
  42
  43 #define dbgarg2(fmt, arg...) \
  44                 do {                                                    \
  45                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
  46                         printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\
  47                 } while (0)
  48
  49 #define dbgarg3(fmt, arg...) \
  50                 do {                                                    \
  51                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
  52                         printk(KERN_CONT "%s: " fmt, vfd->name, ## arg);\
  53                 } while (0)
  54
  55 /* Zero out the end of the struct pointed to by p.  Everthing after, but
  56  * not including, the specified field is cleared. */
  57 #define CLEAR_AFTER_FIELD(p, field) \
  58         memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
  59         0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
  60
  61 struct std_descr {
  62         v4l2_std_id std;
  63         const char *descr;
  64 };
  65
  66 static const struct std_descr standards[] = {
  67         { V4L2_STD_NTSC,        "NTSC"      },
  68         { V4L2_STD_NTSC_M,      "NTSC-M"    },
  69         { V4L2_STD_NTSC_M_JP,   "NTSC-M-JP" },
  70         { V4L2_STD_NTSC_M_KR,   "NTSC-M-KR" },
  71         { V4L2_STD_NTSC_443,    "NTSC-443"  },
  72         { V4L2_STD_PAL,         "PAL"       },
  73         { V4L2_STD_PAL_BG,      "PAL-BG"    },
  74         { V4L2_STD_PAL_B,       "PAL-B"     },
  75         { V4L2_STD_PAL_B1,      "PAL-B1"    },
  76         { V4L2_STD_PAL_G,       "PAL-G"     },
  77         { V4L2_STD_PAL_H,       "PAL-H"     },
  78         { V4L2_STD_PAL_I,       "PAL-I"     },
  79         { V4L2_STD_PAL_DK,      "PAL-DK"    },
  80         { V4L2_STD_PAL_D,       "PAL-D"     },
  81         { V4L2_STD_PAL_D1,      "PAL-D1"    },
  82         { V4L2_STD_PAL_K,       "PAL-K"     },
  83         { V4L2_STD_PAL_M,       "PAL-M"     },
  84         { V4L2_STD_PAL_N,       "PAL-N"     },
  85         { V4L2_STD_PAL_Nc,      "PAL-Nc"    },
  86         { V4L2_STD_PAL_60,      "PAL-60"    },
  87         { V4L2_STD_SECAM,       "SECAM"     },
  88         { V4L2_STD_SECAM_B,     "SECAM-B"   },
  89         { V4L2_STD_SECAM_G,     "SECAM-G"   },
  90         { V4L2_STD_SECAM_H,     "SECAM-H"   },
  91         { V4L2_STD_SECAM_DK,    "SECAM-DK"  },
  92         { V4L2_STD_SECAM_D,     "SECAM-D"   },
  93         { V4L2_STD_SECAM_K,     "SECAM-K"   },
  94         { V4L2_STD_SECAM_K1,    "SECAM-K1"  },
  95         { V4L2_STD_SECAM_L,     "SECAM-L"   },
  96         { V4L2_STD_SECAM_LC,    "SECAM-Lc"  },
  97         { 0,                    "Unknown"   }
  98 };
  99
 100 /* video4linux standard ID conversion to standard name
 101  */
 102 const char *v4l2_norm_to_name(v4l2_std_id id)
 103 {
 104         u32 myid = id;
 105         int i;
 106
 107         /* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
 108            64 bit comparations. So, on that architecture, with some gcc
 109            variants, compilation fails. Currently, the max value is 30bit wide.
 110          */
 111         BUG_ON(myid != id);
 112
 113         for (i = 0; standards[i].std; i++)
 114                 if (myid == standards[i].std)
 115                         break;
 116         return standards[i].descr;
 117 }
 118 EXPORT_SYMBOL(v4l2_norm_to_name);
 119
 120 /* Returns frame period for the given standard */
 121 void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
 122 {
 123         if (id & V4L2_STD_525_60) {
 124                 frameperiod->numerator = 1001;
 125                 frameperiod->denominator = 30000;
 126         } else {
 127                 frameperiod->numerator = 1;
 128                 frameperiod->denominator = 25;
 129         }
 130 }
 131 EXPORT_SYMBOL(v4l2_video_std_frame_period);
 132
 133 /* Fill in the fields of a v4l2_standard structure according to the
 134    'id' and 'transmission' parameters.  Returns negative on error.  */
 135 int v4l2_video_std_construct(struct v4l2_standard *vs,
 136                              int id, const char *name)
 137 {
 138         vs->id = id;
 139         v4l2_video_std_frame_period(id, &vs->frameperiod);
 140         vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
 141         strlcpy(vs->name, name, sizeof(vs->name));
 142         return 0;
 143 }
 144 EXPORT_SYMBOL(v4l2_video_std_construct);
 145
 146 /* ----------------------------------------------------------------- */
 147 /* some arrays for pretty-printing debug messages of enum types      */
 148
 149 const char *v4l2_field_names[] = {
 150         [V4L2_FIELD_ANY]        = "any",
 151         [V4L2_FIELD_NONE]       = "none",
 152         [V4L2_FIELD_TOP]        = "top",
 153         [V4L2_FIELD_BOTTOM]     = "bottom",
 154         [V4L2_FIELD_INTERLACED] = "interlaced",
 155         [V4L2_FIELD_SEQ_TB]     = "seq-tb",
 156         [V4L2_FIELD_SEQ_BT]     = "seq-bt",
 157         [V4L2_FIELD_ALTERNATE]  = "alternate",
 158         [V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
 159         [V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
 160 };
 161 EXPORT_SYMBOL(v4l2_field_names);
 162
 163 const char *v4l2_type_names[] = {
 164         [V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
 165         [V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
 166         [V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
 167         [V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
 168         [V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
 169         [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
 170         [V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
 171         [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
 172 };
 173 EXPORT_SYMBOL(v4l2_type_names);
 174
 175 static const char *v4l2_memory_names[] = {
 176         [V4L2_MEMORY_MMAP]    = "mmap",
 177         [V4L2_MEMORY_USERPTR] = "userptr",
 178         [V4L2_MEMORY_OVERLAY] = "overlay",
 179 };
 180
 181 #define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \
 182                            arr[a] : "unknown")
 183
 184 /* ------------------------------------------------------------------ */
 185 /* debug help functions                                               */
 186
 187 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 188 static const char *v4l1_ioctls[] = {
 189         [_IOC_NR(VIDIOCGCAP)]       = "VIDIOCGCAP",
 190         [_IOC_NR(VIDIOCGCHAN)]      = "VIDIOCGCHAN",
 191         [_IOC_NR(VIDIOCSCHAN)]      = "VIDIOCSCHAN",
 192         [_IOC_NR(VIDIOCGTUNER)]     = "VIDIOCGTUNER",
 193         [_IOC_NR(VIDIOCSTUNER)]     = "VIDIOCSTUNER",
 194         [_IOC_NR(VIDIOCGPICT)]      = "VIDIOCGPICT",
 195         [_IOC_NR(VIDIOCSPICT)]      = "VIDIOCSPICT",
 196         [_IOC_NR(VIDIOCCAPTURE)]    = "VIDIOCCAPTURE",
 197         [_IOC_NR(VIDIOCGWIN)]       = "VIDIOCGWIN",
 198         [_IOC_NR(VIDIOCSWIN)]       = "VIDIOCSWIN",
 199         [_IOC_NR(VIDIOCGFBUF)]      = "VIDIOCGFBUF",
 200         [_IOC_NR(VIDIOCSFBUF)]      = "VIDIOCSFBUF",
 201         [_IOC_NR(VIDIOCKEY)]        = "VIDIOCKEY",
 202         [_IOC_NR(VIDIOCGFREQ)]      = "VIDIOCGFREQ",
 203         [_IOC_NR(VIDIOCSFREQ)]      = "VIDIOCSFREQ",
 204         [_IOC_NR(VIDIOCGAUDIO)]     = "VIDIOCGAUDIO",
 205         [_IOC_NR(VIDIOCSAUDIO)]     = "VIDIOCSAUDIO",
 206         [_IOC_NR(VIDIOCSYNC)]       = "VIDIOCSYNC",
 207         [_IOC_NR(VIDIOCMCAPTURE)]   = "VIDIOCMCAPTURE",
 208         [_IOC_NR(VIDIOCGMBUF)]      = "VIDIOCGMBUF",
 209         [_IOC_NR(VIDIOCGUNIT)]      = "VIDIOCGUNIT",
 210         [_IOC_NR(VIDIOCGCAPTURE)]   = "VIDIOCGCAPTURE",
 211         [_IOC_NR(VIDIOCSCAPTURE)]   = "VIDIOCSCAPTURE",
 212         [_IOC_NR(VIDIOCSPLAYMODE)]  = "VIDIOCSPLAYMODE",
 213         [_IOC_NR(VIDIOCSWRITEMODE)] = "VIDIOCSWRITEMODE",
 214         [_IOC_NR(VIDIOCGPLAYINFO)]  = "VIDIOCGPLAYINFO",
 215         [_IOC_NR(VIDIOCSMICROCODE)] = "VIDIOCSMICROCODE",
 216         [_IOC_NR(VIDIOCGVBIFMT)]    = "VIDIOCGVBIFMT",
 217         [_IOC_NR(VIDIOCSVBIFMT)]    = "VIDIOCSVBIFMT"
 218 };
 219 #define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
 220 #endif
 221
 222 static const char *v4l2_ioctls[] = {
 223         [_IOC_NR(VIDIOC_QUERYCAP)]         = "VIDIOC_QUERYCAP",
 224         [_IOC_NR(VIDIOC_RESERVED)]         = "VIDIOC_RESERVED",
 225         [_IOC_NR(VIDIOC_ENUM_FMT)]         = "VIDIOC_ENUM_FMT",
 226         [_IOC_NR(VIDIOC_G_FMT)]            = "VIDIOC_G_FMT",
 227         [_IOC_NR(VIDIOC_S_FMT)]            = "VIDIOC_S_FMT",
 228         [_IOC_NR(VIDIOC_REQBUFS)]          = "VIDIOC_REQBUFS",
 229         [_IOC_NR(VIDIOC_QUERYBUF)]         = "VIDIOC_QUERYBUF",
 230         [_IOC_NR(VIDIOC_G_FBUF)]           = "VIDIOC_G_FBUF",
 231         [_IOC_NR(VIDIOC_S_FBUF)]           = "VIDIOC_S_FBUF",
 232         [_IOC_NR(VIDIOC_OVERLAY)]          = "VIDIOC_OVERLAY",
 233         [_IOC_NR(VIDIOC_QBUF)]             = "VIDIOC_QBUF",
 234         [_IOC_NR(VIDIOC_DQBUF)]            = "VIDIOC_DQBUF",
 235         [_IOC_NR(VIDIOC_STREAMON)]         = "VIDIOC_STREAMON",
 236         [_IOC_NR(VIDIOC_STREAMOFF)]        = "VIDIOC_STREAMOFF",
 237         [_IOC_NR(VIDIOC_G_PARM)]           = "VIDIOC_G_PARM",
 238         [_IOC_NR(VIDIOC_S_PARM)]           = "VIDIOC_S_PARM",
 239         [_IOC_NR(VIDIOC_G_STD)]            = "VIDIOC_G_STD",
 240         [_IOC_NR(VIDIOC_S_STD)]            = "VIDIOC_S_STD",
 241         [_IOC_NR(VIDIOC_ENUMSTD)]          = "VIDIOC_ENUMSTD",
 242         [_IOC_NR(VIDIOC_ENUMINPUT)]        = "VIDIOC_ENUMINPUT",
 243         [_IOC_NR(VIDIOC_G_CTRL)]           = "VIDIOC_G_CTRL",
 244         [_IOC_NR(VIDIOC_S_CTRL)]           = "VIDIOC_S_CTRL",
 245         [_IOC_NR(VIDIOC_G_TUNER)]          = "VIDIOC_G_TUNER",
 246         [_IOC_NR(VIDIOC_S_TUNER)]          = "VIDIOC_S_TUNER",
 247         [_IOC_NR(VIDIOC_G_AUDIO)]          = "VIDIOC_G_AUDIO",
 248         [_IOC_NR(VIDIOC_S_AUDIO)]          = "VIDIOC_S_AUDIO",
 249         [_IOC_NR(VIDIOC_QUERYCTRL)]        = "VIDIOC_QUERYCTRL",
 250         [_IOC_NR(VIDIOC_QUERYMENU)]        = "VIDIOC_QUERYMENU",
 251         [_IOC_NR(VIDIOC_G_INPUT)]          = "VIDIOC_G_INPUT",
 252         [_IOC_NR(VIDIOC_S_INPUT)]          = "VIDIOC_S_INPUT",
 253         [_IOC_NR(VIDIOC_G_OUTPUT)]         = "VIDIOC_G_OUTPUT",
 254         [_IOC_NR(VIDIOC_S_OUTPUT)]         = "VIDIOC_S_OUTPUT",
 255         [_IOC_NR(VIDIOC_ENUMOUTPUT)]       = "VIDIOC_ENUMOUTPUT",
 256         [_IOC_NR(VIDIOC_G_AUDOUT)]         = "VIDIOC_G_AUDOUT",
 257         [_IOC_NR(VIDIOC_S_AUDOUT)]         = "VIDIOC_S_AUDOUT",
 258         [_IOC_NR(VIDIOC_G_MODULATOR)]      = "VIDIOC_G_MODULATOR",
 259         [_IOC_NR(VIDIOC_S_MODULATOR)]      = "VIDIOC_S_MODULATOR",
 260         [_IOC_NR(VIDIOC_G_FREQUENCY)]      = "VIDIOC_G_FREQUENCY",
 261         [_IOC_NR(VIDIOC_S_FREQUENCY)]      = "VIDIOC_S_FREQUENCY",
 262         [_IOC_NR(VIDIOC_CROPCAP)]          = "VIDIOC_CROPCAP",
 263         [_IOC_NR(VIDIOC_G_CROP)]           = "VIDIOC_G_CROP",
 264         [_IOC_NR(VIDIOC_S_CROP)]           = "VIDIOC_S_CROP",
 265         [_IOC_NR(VIDIOC_G_JPEGCOMP)]       = "VIDIOC_G_JPEGCOMP",
 266         [_IOC_NR(VIDIOC_S_JPEGCOMP)]       = "VIDIOC_S_JPEGCOMP",
 267         [_IOC_NR(VIDIOC_QUERYSTD)]         = "VIDIOC_QUERYSTD",
 268         [_IOC_NR(VIDIOC_TRY_FMT)]          = "VIDIOC_TRY_FMT",
 269         [_IOC_NR(VIDIOC_ENUMAUDIO)]        = "VIDIOC_ENUMAUDIO",
 270         [_IOC_NR(VIDIOC_ENUMAUDOUT)]       = "VIDIOC_ENUMAUDOUT",
 271         [_IOC_NR(VIDIOC_G_PRIORITY)]       = "VIDIOC_G_PRIORITY",
 272         [_IOC_NR(VIDIOC_S_PRIORITY)]       = "VIDIOC_S_PRIORITY",
 273         [_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP",
 274         [_IOC_NR(VIDIOC_LOG_STATUS)]       = "VIDIOC_LOG_STATUS",
 275         [_IOC_NR(VIDIOC_G_EXT_CTRLS)]      = "VIDIOC_G_EXT_CTRLS",
 276         [_IOC_NR(VIDIOC_S_EXT_CTRLS)]      = "VIDIOC_S_EXT_CTRLS",
 277         [_IOC_NR(VIDIOC_TRY_EXT_CTRLS)]    = "VIDIOC_TRY_EXT_CTRLS",
 278 #if 1
 279         [_IOC_NR(VIDIOC_ENUM_FRAMESIZES)]  = "VIDIOC_ENUM_FRAMESIZES",
 280         [_IOC_NR(VIDIOC_ENUM_FRAMEINTERVALS)] = "VIDIOC_ENUM_FRAMEINTERVALS",
 281         [_IOC_NR(VIDIOC_G_ENC_INDEX)]      = "VIDIOC_G_ENC_INDEX",
 282         [_IOC_NR(VIDIOC_ENCODER_CMD)]      = "VIDIOC_ENCODER_CMD",
 283         [_IOC_NR(VIDIOC_TRY_ENCODER_CMD)]  = "VIDIOC_TRY_ENCODER_CMD",
 284
 285         [_IOC_NR(VIDIOC_DBG_S_REGISTER)]   = "VIDIOC_DBG_S_REGISTER",
 286         [_IOC_NR(VIDIOC_DBG_G_REGISTER)]   = "VIDIOC_DBG_G_REGISTER",
 287
 288         [_IOC_NR(VIDIOC_DBG_G_CHIP_IDENT)] = "VIDIOC_DBG_G_CHIP_IDENT",
 289         [_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)]   = "VIDIOC_S_HW_FREQ_SEEK",
 290 #endif
 291         [_IOC_NR(VIDIOC_ENUM_DV_PRESETS)]  = "VIDIOC_ENUM_DV_PRESETS",
 292         [_IOC_NR(VIDIOC_S_DV_PRESET)]      = "VIDIOC_S_DV_PRESET",
 293         [_IOC_NR(VIDIOC_G_DV_PRESET)]      = "VIDIOC_G_DV_PRESET",
 294         [_IOC_NR(VIDIOC_QUERY_DV_PRESET)]  = "VIDIOC_QUERY_DV_PRESET",
 295         [_IOC_NR(VIDIOC_S_DV_TIMINGS)]     = "VIDIOC_S_DV_TIMINGS",
 296         [_IOC_NR(VIDIOC_G_DV_TIMINGS)]     = "VIDIOC_G_DV_TIMINGS",
 297         [_IOC_NR(VIDIOC_DQEVENT)]          = "VIDIOC_DQEVENT",
 298         [_IOC_NR(VIDIOC_SUBSCRIBE_EVENT)]  = "VIDIOC_SUBSCRIBE_EVENT",
 299         [_IOC_NR(VIDIOC_UNSUBSCRIBE_EVENT)] = "VIDIOC_UNSUBSCRIBE_EVENT",
 300 };
 301 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
 302
 303 /* Common ioctl debug function. This function can be used by
 304    external ioctl messages as well as internal V4L ioctl */
 305 void v4l_printk_ioctl(unsigned int cmd)
 306 {
 307         char *dir, *type;
 308
 309         switch (_IOC_TYPE(cmd)) {
 310         case 'd':
 311                 type = "v4l2_int";
 312                 break;
 313 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 314         case 'v':
 315                 if (_IOC_NR(cmd) >= V4L1_IOCTLS) {
 316                         type = "v4l1";
 317                         break;
 318                 }
 319                 printk("%s", v4l1_ioctls[_IOC_NR(cmd)]);
 320                 return;
 321 #endif
 322         case 'V':
 323                 if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
 324                         type = "v4l2";
 325                         break;
 326                 }
 327                 printk("%s", v4l2_ioctls[_IOC_NR(cmd)]);
 328                 return;
 329         default:
 330                 type = "unknown";
 331         }
 332
 333         switch (_IOC_DIR(cmd)) {
 334         case _IOC_NONE:              dir = "--"; break;
 335         case _IOC_READ:              dir = "r-"; break;
 336         case _IOC_WRITE:             dir = "-w"; break;
 337         case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
 338         default:                     dir = "*ERR*"; break;
 339         }
 340         printk("%s ioctl '%c', dir=%s, #%d (0x%08x)",
 341                 type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
 342 }
 343 EXPORT_SYMBOL(v4l_printk_ioctl);
 344
 345 /*
 346  * helper function -- handles userspace copying for ioctl arguments
 347  */
 348
 349 #ifdef __OLD_VIDIOC_
 350 static unsigned int
 351 video_fix_command(unsigned int cmd)
 352 {
 353         switch (cmd) {
 354         case VIDIOC_OVERLAY_OLD:
 355                 cmd = VIDIOC_OVERLAY;
 356                 break;
 357         case VIDIOC_S_PARM_OLD:
 358                 cmd = VIDIOC_S_PARM;
 359                 break;
 360         case VIDIOC_S_CTRL_OLD:
 361                 cmd = VIDIOC_S_CTRL;
 362                 break;
 363         case VIDIOC_G_AUDIO_OLD:
 364                 cmd = VIDIOC_G_AUDIO;
 365                 break;
 366         case VIDIOC_G_AUDOUT_OLD:
 367                 cmd = VIDIOC_G_AUDOUT;
 368                 break;
 369         case VIDIOC_CROPCAP_OLD:
 370                 cmd = VIDIOC_CROPCAP;
 371                 break;
 372         }
 373         return cmd;
 374 }
 375 #endif
 376
 377 /*
 378  * Obsolete usercopy function - Should be removed soon
 379  */
 380 long
 381 video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
 382                 v4l2_kioctl func)
 383 {
 384         char    sbuf[128];
 385         void    *mbuf = NULL;
 386         void    *parg = NULL;
 387         long    err  = -EINVAL;
 388         int     is_ext_ctrl;
 389         size_t  ctrls_size = 0;
 390         void __user *user_ptr = NULL;
 391
 392 #ifdef __OLD_VIDIOC_
 393         cmd = video_fix_command(cmd);
 394 #endif
 395         is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
 396                        cmd == VIDIOC_TRY_EXT_CTRLS);
 397
 398         /*  Copy arguments into temp kernel buffer  */
 399         switch (_IOC_DIR(cmd)) {
 400         case _IOC_NONE:
 401                 parg = NULL;
 402                 break;
 403         case _IOC_READ:
 404         case _IOC_WRITE:
 405         case (_IOC_WRITE | _IOC_READ):
 406                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 407                         parg = sbuf;
 408                 } else {
 409                         /* too big to allocate from stack */
 410                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 411                         if (NULL == mbuf)
 412                                 return -ENOMEM;
 413                         parg = mbuf;
 414                 }
 415
 416                 err = -EFAULT;
 417                 if (_IOC_DIR(cmd) & _IOC_WRITE)
 418                         if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 419                                 goto out;
 420                 break;
 421         }
 422         if (is_ext_ctrl) {
 423                 struct v4l2_ext_controls *p = parg;
 424
 425                 /* In case of an error, tell the caller that it wasn't
 426                    a specific control that caused it. */
 427                 p->error_idx = p->count;
 428                 user_ptr = (void __user *)p->controls;
 429                 if (p->count) {
 430                         ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
 431                         /* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
 432                         mbuf = kmalloc(ctrls_size, GFP_KERNEL);
 433                         err = -ENOMEM;
 434                         if (NULL == mbuf)
 435                                 goto out_ext_ctrl;
 436                         err = -EFAULT;
 437                         if (copy_from_user(mbuf, user_ptr, ctrls_size))
 438                                 goto out_ext_ctrl;
 439                         p->controls = mbuf;
 440                 }
 441         }
 442
 443         /* call driver */
 444         err = func(file, cmd, parg);
 445         if (err == -ENOIOCTLCMD)
 446                 err = -EINVAL;
 447         if (is_ext_ctrl) {
 448                 struct v4l2_ext_controls *p = parg;
 449
 450                 p->controls = (void *)user_ptr;
 451                 if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
 452                         err = -EFAULT;
 453                 goto out_ext_ctrl;
 454         }
 455         if (err < 0)
 456                 goto out;
 457
 458 out_ext_ctrl:
 459         /*  Copy results into user buffer  */
 460         switch (_IOC_DIR(cmd)) {
 461         case _IOC_READ:
 462         case (_IOC_WRITE | _IOC_READ):
 463                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 464                         err = -EFAULT;
 465                 break;
 466         }
 467
 468 out:
 469         kfree(mbuf);
 470         return err;
 471 }
 472 EXPORT_SYMBOL(video_usercopy);
 473
 474 static void dbgbuf(unsigned int cmd, struct video_device *vfd,
 475                                         struct v4l2_buffer *p)
 476 {
 477         struct v4l2_timecode *tc = &p->timecode;
 478
 479         dbgarg(cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, "
 480                 "bytesused=%d, flags=0x%08d, "
 481                 "field=%0d, sequence=%d, memory=%s, offset/userptr=0x%08lx, length=%d\n",
 482                         p->timestamp.tv_sec / 3600,
 483                         (int)(p->timestamp.tv_sec / 60) % 60,
 484                         (int)(p->timestamp.tv_sec % 60),
 485                         (long)p->timestamp.tv_usec,
 486                         p->index,
 487                         prt_names(p->type, v4l2_type_names),
 488                         p->bytesused, p->flags,
 489                         p->field, p->sequence,
 490                         prt_names(p->memory, v4l2_memory_names),
 491                         p->m.userptr, p->length);
 492         dbgarg2("timecode=%02d:%02d:%02d type=%d, "
 493                 "flags=0x%08d, frames=%d, userbits=0x%08x\n",
 494                         tc->hours, tc->minutes, tc->seconds,
 495                         tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
 496 }
 497
 498 static inline void dbgrect(struct video_device *vfd, char *s,
 499                                                         struct v4l2_rect *r)
 500 {
 501         dbgarg2("%sRect start at %dx%d, size=%dx%d\n", s, r->left, r->top,
 502                                                 r->width, r->height);
 503 };
 504
 505 static inline void v4l_print_pix_fmt(struct video_device *vfd,
 506                                                 struct v4l2_pix_format *fmt)
 507 {
 508         dbgarg2("width=%d, height=%d, format=%c%c%c%c, field=%s, "
 509                 "bytesperline=%d sizeimage=%d, colorspace=%d\n",
 510                 fmt->width, fmt->height,
 511                 (fmt->pixelformat & 0xff),
 512                 (fmt->pixelformat >>  8) & 0xff,
 513                 (fmt->pixelformat >> 16) & 0xff,
 514                 (fmt->pixelformat >> 24) & 0xff,
 515                 prt_names(fmt->field, v4l2_field_names),
 516                 fmt->bytesperline, fmt->sizeimage, fmt->colorspace);
 517 };
 518
 519 static inline void v4l_print_ext_ctrls(unsigned int cmd,
 520         struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals)
 521 {
 522         __u32 i;
 523
 524         if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG))
 525                 return;
 526         dbgarg(cmd, "");
 527         printk(KERN_CONT "class=0x%x", c->ctrl_class);
 528         for (i = 0; i < c->count; i++) {
 529                 if (show_vals && !c->controls[i].size)
 530                         printk(KERN_CONT " id/val=0x%x/0x%x",
 531                                 c->controls[i].id, c->controls[i].value);
 532                 else
 533                         printk(KERN_CONT " id=0x%x,size=%u",
 534                                 c->controls[i].id, c->controls[i].size);
 535         }
 536         printk(KERN_CONT "\n");
 537 };
 538
 539 static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
 540 {
 541         __u32 i;
 542
 543         /* zero the reserved fields */
 544         c->reserved[0] = c->reserved[1] = 0;
 545         for (i = 0; i < c->count; i++)
 546                 c->controls[i].reserved2[0] = 0;
 547
 548         /* V4L2_CID_PRIVATE_BASE cannot be used as control class
 549            when using extended controls.
 550            Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
 551            is it allowed for backwards compatibility.
 552          */
 553         if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
 554                 return 0;
 555         /* Check that all controls are from the same control class. */
 556         for (i = 0; i < c->count; i++) {
 557                 if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
 558                         c->error_idx = i;
 559                         return 0;
 560                 }
 561         }
 562         return 1;
 563 }
 564
 565 static int check_fmt(const struct v4l2_ioctl_ops *ops, enum v4l2_buf_type type)
 566 {
 567         if (ops == NULL)
 568                 return -EINVAL;
 569
 570         switch (type) {
 571         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 572                 if (ops->vidioc_g_fmt_vid_cap)
 573                         return 0;
 574                 break;
 575         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 576                 if (ops->vidioc_g_fmt_vid_overlay)
 577                         return 0;
 578                 break;
 579         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 580                 if (ops->vidioc_g_fmt_vid_out)
 581                         return 0;
 582                 break;
 583         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 584                 if (ops->vidioc_g_fmt_vid_out_overlay)
 585                         return 0;
 586                 break;
 587         case V4L2_BUF_TYPE_VBI_CAPTURE:
 588                 if (ops->vidioc_g_fmt_vbi_cap)
 589                         return 0;
 590                 break;
 591         case V4L2_BUF_TYPE_VBI_OUTPUT:
 592                 if (ops->vidioc_g_fmt_vbi_out)
 593                         return 0;
 594                 break;
 595         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 596                 if (ops->vidioc_g_fmt_sliced_vbi_cap)
 597                         return 0;
 598                 break;
 599         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 600                 if (ops->vidioc_g_fmt_sliced_vbi_out)
 601                         return 0;
 602                 break;
 603         case V4L2_BUF_TYPE_PRIVATE:
 604                 if (ops->vidioc_g_fmt_type_private)
 605                         return 0;
 606                 break;
 607         }
 608         return -EINVAL;
 609 }
 610
 611 static long __video_do_ioctl(struct file *file,
 612                 unsigned int cmd, void *arg)
 613 {
 614         struct video_device *vfd = video_devdata(file);
 615         const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
 616         void *fh = file->private_data;
 617         long ret = -EINVAL;
 618
 619         if (ops == NULL) {
 620                 printk(KERN_WARNING "videodev: \"%s\" has no ioctl_ops.\n",
 621                                 vfd->name);
 622                 return -EINVAL;
 623         }
 624
 625 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 626         /********************************************************
 627          All other V4L1 calls are handled by v4l1_compat module.
 628          Those calls will be translated into V4L2 calls, and
 629          __video_do_ioctl will be called again, with one or more
 630          V4L2 ioctls.
 631          ********************************************************/
 632         if (_IOC_TYPE(cmd) == 'v' && cmd != VIDIOCGMBUF &&
 633                                 _IOC_NR(cmd) < BASE_VIDIOCPRIVATE) {
 634                 return v4l_compat_translate_ioctl(file, cmd, arg,
 635                                                 __video_do_ioctl);
 636         }
 637 #endif
 638
 639         if ((vfd->debug & V4L2_DEBUG_IOCTL) &&
 640                                 !(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) {
 641                 v4l_print_ioctl(vfd->name, cmd);
 642                 printk(KERN_CONT "\n");
 643         }
 644
 645         switch (cmd) {
 646
 647 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 648         /***********************************************************
 649          Handles calls to the obsoleted V4L1 API
 650          Due to the nature of VIDIOCGMBUF, each driver that supports
 651          V4L1 should implement its own handler for this ioctl.
 652          ***********************************************************/
 653
 654         /* --- streaming capture ------------------------------------- */
 655         case VIDIOCGMBUF:
 656         {
 657                 struct video_mbuf *p = arg;
 658
 659                 if (!ops->vidiocgmbuf)
 660                         break;
 661                 ret = ops->vidiocgmbuf(file, fh, p);
 662                 if (!ret)
 663                         dbgarg(cmd, "size=%d, frames=%d, offsets=0x%08lx\n",
 664                                                 p->size, p->frames,
 665                                                 (unsigned long)p->offsets);
 666                 break;
 667         }
 668 #endif
 669
 670         /* --- capabilities ------------------------------------------ */
 671         case VIDIOC_QUERYCAP:
 672         {
 673                 struct v4l2_capability *cap = (struct v4l2_capability *)arg;
 674
 675                 if (!ops->vidioc_querycap)
 676                         break;
 677
 678                 ret = ops->vidioc_querycap(file, fh, cap);
 679                 if (!ret)
 680                         dbgarg(cmd, "driver=%s, card=%s, bus=%s, "
 681                                         "version=0x%08x, "
 682                                         "capabilities=0x%08x\n",
 683                                         cap->driver, cap->card, cap->bus_info,
 684                                         cap->version,
 685                                         cap->capabilities);
 686                 break;
 687         }
 688
 689         /* --- priority ------------------------------------------ */
 690         case VIDIOC_G_PRIORITY:
 691         {
 692                 enum v4l2_priority *p = arg;
 693
 694                 if (!ops->vidioc_g_priority)
 695                         break;
 696                 ret = ops->vidioc_g_priority(file, fh, p);
 697                 if (!ret)
 698                         dbgarg(cmd, "priority is %d\n", *p);
 699                 break;
 700         }
 701         case VIDIOC_S_PRIORITY:
 702         {
 703                 enum v4l2_priority *p = arg;
 704
 705                 if (!ops->vidioc_s_priority)
 706                         break;
 707                 dbgarg(cmd, "setting priority to %d\n", *p);
 708                 ret = ops->vidioc_s_priority(file, fh, *p);
 709                 break;
 710         }
 711
 712         /* --- capture ioctls ---------------------------------------- */
 713         case VIDIOC_ENUM_FMT:
 714         {
 715                 struct v4l2_fmtdesc *f = arg;
 716
 717                 switch (f->type) {
 718                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 719                         if (ops->vidioc_enum_fmt_vid_cap)
 720                                 ret = ops->vidioc_enum_fmt_vid_cap(file, fh, f);
 721                         break;
 722                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 723                         if (ops->vidioc_enum_fmt_vid_overlay)
 724                                 ret = ops->vidioc_enum_fmt_vid_overlay(file,
 725                                         fh, f);
 726                         break;
 727                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 728                         if (ops->vidioc_enum_fmt_vid_out)
 729                                 ret = ops->vidioc_enum_fmt_vid_out(file, fh, f);
 730                         break;
 731                 case V4L2_BUF_TYPE_PRIVATE:
 732                         if (ops->vidioc_enum_fmt_type_private)
 733                                 ret = ops->vidioc_enum_fmt_type_private(file,
 734                                                                 fh, f);
 735                         break;
 736                 default:
 737                         break;
 738                 }
 739                 if (!ret)
 740                         dbgarg(cmd, "index=%d, type=%d, flags=%d, "
 741                                 "pixelformat=%c%c%c%c, description='%s'\n",
 742                                 f->index, f->type, f->flags,
 743                                 (f->pixelformat & 0xff),
 744                                 (f->pixelformat >>  8) & 0xff,
 745                                 (f->pixelformat >> 16) & 0xff,
 746                                 (f->pixelformat >> 24) & 0xff,
 747                                 f->description);
 748                 break;
 749         }
 750         case VIDIOC_G_FMT:
 751         {
 752                 struct v4l2_format *f = (struct v4l2_format *)arg;
 753
 754                 /* FIXME: Should be one dump per type */
 755                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
 756
 757                 switch (f->type) {
 758                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 759                         if (ops->vidioc_g_fmt_vid_cap)
 760                                 ret = ops->vidioc_g_fmt_vid_cap(file, fh, f);
 761                         if (!ret)
 762                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 763                         break;
 764                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 765                         if (ops->vidioc_g_fmt_vid_overlay)
 766                                 ret = ops->vidioc_g_fmt_vid_overlay(file,
 767                                                                     fh, f);
 768                         break;
 769                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 770                         if (ops->vidioc_g_fmt_vid_out)
 771                                 ret = ops->vidioc_g_fmt_vid_out(file, fh, f);
 772                         if (!ret)
 773                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 774                         break;
 775                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 776                         if (ops->vidioc_g_fmt_vid_out_overlay)
 777                                 ret = ops->vidioc_g_fmt_vid_out_overlay(file,
 778                                        fh, f);
 779                         break;
 780                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 781                         if (ops->vidioc_g_fmt_vbi_cap)
 782                                 ret = ops->vidioc_g_fmt_vbi_cap(file, fh, f);
 783                         break;
 784                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 785                         if (ops->vidioc_g_fmt_vbi_out)
 786                                 ret = ops->vidioc_g_fmt_vbi_out(file, fh, f);
 787                         break;
 788                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 789                         if (ops->vidioc_g_fmt_sliced_vbi_cap)
 790                                 ret = ops->vidioc_g_fmt_sliced_vbi_cap(file,
 791                                                                         fh, f);
 792                         break;
 793                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 794                         if (ops->vidioc_g_fmt_sliced_vbi_out)
 795                                 ret = ops->vidioc_g_fmt_sliced_vbi_out(file,
 796                                                                         fh, f);
 797                         break;
 798                 case V4L2_BUF_TYPE_PRIVATE:
 799                         if (ops->vidioc_g_fmt_type_private)
 800                                 ret = ops->vidioc_g_fmt_type_private(file,
 801                                                                 fh, f);
 802                         break;
 803                 }
 804
 805                 break;
 806         }
 807         case VIDIOC_S_FMT:
 808         {
 809                 struct v4l2_format *f = (struct v4l2_format *)arg;
 810
 811                 /* FIXME: Should be one dump per type */
 812                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
 813
 814                 switch (f->type) {
 815                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 816                         CLEAR_AFTER_FIELD(f, fmt.pix);
 817                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
 818                         if (ops->vidioc_s_fmt_vid_cap)
 819                                 ret = ops->vidioc_s_fmt_vid_cap(file, fh, f);
 820                         break;
 821                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 822                         CLEAR_AFTER_FIELD(f, fmt.win);
 823                         if (ops->vidioc_s_fmt_vid_overlay)
 824                                 ret = ops->vidioc_s_fmt_vid_overlay(file,
 825                                                                     fh, f);
 826                         break;
 827                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 828                         CLEAR_AFTER_FIELD(f, fmt.pix);
 829                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
 830                         if (ops->vidioc_s_fmt_vid_out)
 831                                 ret = ops->vidioc_s_fmt_vid_out(file, fh, f);
 832                         break;
 833                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 834                         CLEAR_AFTER_FIELD(f, fmt.win);
 835                         if (ops->vidioc_s_fmt_vid_out_overlay)
 836                                 ret = ops->vidioc_s_fmt_vid_out_overlay(file,
 837                                         fh, f);
 838                         break;
 839                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 840                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 841                         if (ops->vidioc_s_fmt_vbi_cap)
 842                                 ret = ops->vidioc_s_fmt_vbi_cap(file, fh, f);
 843                         break;
 844                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 845                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 846                         if (ops->vidioc_s_fmt_vbi_out)
 847                                 ret = ops->vidioc_s_fmt_vbi_out(file, fh, f);
 848                         break;
 849                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 850                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 851                         if (ops->vidioc_s_fmt_sliced_vbi_cap)
 852                                 ret = ops->vidioc_s_fmt_sliced_vbi_cap(file,
 853                                                                         fh, f);
 854                         break;
 855                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 856                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 857                         if (ops->vidioc_s_fmt_sliced_vbi_out)
 858                                 ret = ops->vidioc_s_fmt_sliced_vbi_out(file,
 859                                                                         fh, f);
 860                         break;
 861                 case V4L2_BUF_TYPE_PRIVATE:
 862                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
 863                         if (ops->vidioc_s_fmt_type_private)
 864                                 ret = ops->vidioc_s_fmt_type_private(file,
 865                                                                 fh, f);
 866                         break;
 867                 }
 868                 break;
 869         }
 870         case VIDIOC_TRY_FMT:
 871         {
 872                 struct v4l2_format *f = (struct v4l2_format *)arg;
 873
 874                 /* FIXME: Should be one dump per type */
 875                 dbgarg(cmd, "type=%s\n", prt_names(f->type,
 876                                                 v4l2_type_names));
 877                 switch (f->type) {
 878                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 879                         CLEAR_AFTER_FIELD(f, fmt.pix);
 880                         if (ops->vidioc_try_fmt_vid_cap)
 881                                 ret = ops->vidioc_try_fmt_vid_cap(file, fh, f);
 882                         if (!ret)
 883                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 884                         break;
 885                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 886                         CLEAR_AFTER_FIELD(f, fmt.win);
 887                         if (ops->vidioc_try_fmt_vid_overlay)
 888                                 ret = ops->vidioc_try_fmt_vid_overlay(file,
 889                                         fh, f);
 890                         break;
 891                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 892                         CLEAR_AFTER_FIELD(f, fmt.pix);
 893                         if (ops->vidioc_try_fmt_vid_out)
 894                                 ret = ops->vidioc_try_fmt_vid_out(file, fh, f);
 895                         if (!ret)
 896                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 897                         break;
 898                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 899                         CLEAR_AFTER_FIELD(f, fmt.win);
 900                         if (ops->vidioc_try_fmt_vid_out_overlay)
 901                                 ret = ops->vidioc_try_fmt_vid_out_overlay(file,
 902                                        fh, f);
 903                         break;
 904                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 905                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 906                         if (ops->vidioc_try_fmt_vbi_cap)
 907                                 ret = ops->vidioc_try_fmt_vbi_cap(file, fh, f);
 908                         break;
 909                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 910                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 911                         if (ops->vidioc_try_fmt_vbi_out)
 912                                 ret = ops->vidioc_try_fmt_vbi_out(file, fh, f);
 913                         break;
 914                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 915                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 916                         if (ops->vidioc_try_fmt_sliced_vbi_cap)
 917                                 ret = ops->vidioc_try_fmt_sliced_vbi_cap(file,
 918                                                                 fh, f);
 919                         break;
 920                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 921                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 922                         if (ops->vidioc_try_fmt_sliced_vbi_out)
 923                                 ret = ops->vidioc_try_fmt_sliced_vbi_out(file,
 924                                                                 fh, f);
 925                         break;
 926                 case V4L2_BUF_TYPE_PRIVATE:
 927                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
 928                         if (ops->vidioc_try_fmt_type_private)
 929                                 ret = ops->vidioc_try_fmt_type_private(file,
 930                                                                 fh, f);
 931                         break;
 932                 }
 933
 934                 break;
 935         }
 936         /* FIXME: Those buf reqs could be handled here,
 937            with some changes on videobuf to allow its header to be included at
 938            videodev2.h or being merged at videodev2.
 939          */
 940         case VIDIOC_REQBUFS:
 941         {
 942                 struct v4l2_requestbuffers *p = arg;
 943
 944                 if (!ops->vidioc_reqbufs)
 945                         break;
 946                 ret = check_fmt(ops, p->type);
 947                 if (ret)
 948                         break;
 949
 950                 if (p->type < V4L2_BUF_TYPE_PRIVATE)
 951                         CLEAR_AFTER_FIELD(p, memory);
 952
 953                 ret = ops->vidioc_reqbufs(file, fh, p);
 954                 dbgarg(cmd, "count=%d, type=%s, memory=%s\n",
 955                                 p->count,
 956                                 prt_names(p->type, v4l2_type_names),
 957                                 prt_names(p->memory, v4l2_memory_names));
 958                 break;
 959         }
 960         case VIDIOC_QUERYBUF:
 961         {
 962                 struct v4l2_buffer *p = arg;
 963
 964                 if (!ops->vidioc_querybuf)
 965                         break;
 966                 ret = check_fmt(ops, p->type);
 967                 if (ret)
 968                         break;
 969
 970                 ret = ops->vidioc_querybuf(file, fh, p);
 971                 if (!ret)
 972                         dbgbuf(cmd, vfd, p);
 973                 break;
 974         }
 975         case VIDIOC_QBUF:
 976         {
 977                 struct v4l2_buffer *p = arg;
 978
 979                 if (!ops->vidioc_qbuf)
 980                         break;
 981                 ret = check_fmt(ops, p->type);
 982                 if (ret)
 983                         break;
 984
 985                 ret = ops->vidioc_qbuf(file, fh, p);
 986                 if (!ret)
 987                         dbgbuf(cmd, vfd, p);
 988                 break;
 989         }
 990         case VIDIOC_DQBUF:
 991         {
 992                 struct v4l2_buffer *p = arg;
 993
 994                 if (!ops->vidioc_dqbuf)
 995                         break;
 996                 ret = check_fmt(ops, p->type);
 997                 if (ret)
 998                         break;
 999
1000                 ret = ops->vidioc_dqbuf(file, fh, p);
1001                 if (!ret)
1002                         dbgbuf(cmd, vfd, p);
1003                 break;
1004         }
1005         case VIDIOC_OVERLAY:
1006         {
1007                 int *i = arg;
1008
1009                 if (!ops->vidioc_overlay)
1010                         break;
1011                 dbgarg(cmd, "value=%d\n", *i);
1012                 ret = ops->vidioc_overlay(file, fh, *i);
1013                 break;
1014         }
1015         case VIDIOC_G_FBUF:
1016         {
1017                 struct v4l2_framebuffer *p = arg;
1018
1019                 if (!ops->vidioc_g_fbuf)
1020                         break;
1021                 ret = ops->vidioc_g_fbuf(file, fh, arg);
1022                 if (!ret) {
1023                         dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
1024                                         p->capability, p->flags,
1025                                         (unsigned long)p->base);
1026                         v4l_print_pix_fmt(vfd, &p->fmt);
1027                 }
1028                 break;
1029         }
1030         case VIDIOC_S_FBUF:
1031         {
1032                 struct v4l2_framebuffer *p = arg;
1033
1034                 if (!ops->vidioc_s_fbuf)
1035                         break;
1036                 dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
1037                         p->capability, p->flags, (unsigned long)p->base);
1038                 v4l_print_pix_fmt(vfd, &p->fmt);
1039                 ret = ops->vidioc_s_fbuf(file, fh, arg);
1040                 break;
1041         }
1042         case VIDIOC_STREAMON:
1043         {
1044                 enum v4l2_buf_type i = *(int *)arg;
1045
1046                 if (!ops->vidioc_streamon)
1047                         break;
1048                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1049                 ret = ops->vidioc_streamon(file, fh, i);
1050                 break;
1051         }
1052         case VIDIOC_STREAMOFF:
1053         {
1054                 enum v4l2_buf_type i = *(int *)arg;
1055
1056                 if (!ops->vidioc_streamoff)
1057                         break;
1058                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1059                 ret = ops->vidioc_streamoff(file, fh, i);
1060                 break;
1061         }
1062         /* ---------- tv norms ---------- */
1063         case VIDIOC_ENUMSTD:
1064         {
1065                 struct v4l2_standard *p = arg;
1066                 v4l2_std_id id = vfd->tvnorms, curr_id = 0;
1067                 unsigned int index = p->index, i, j = 0;
1068                 const char *descr = "";
1069
1070                 /* Return norm array in a canonical way */
1071                 for (i = 0; i <= index && id; i++) {
1072                         /* last std value in the standards array is 0, so this
1073                            while always ends there since (id & 0) == 0. */
1074                         while ((id & standards[j].std) != standards[j].std)
1075                                 j++;
1076                         curr_id = standards[j].std;
1077                         descr = standards[j].descr;
1078                         j++;
1079                         if (curr_id == 0)
1080                                 break;
1081                         if (curr_id != V4L2_STD_PAL &&
1082                             curr_id != V4L2_STD_SECAM &&
1083                             curr_id != V4L2_STD_NTSC)
1084                                 id &= ~curr_id;
1085                 }
1086                 if (i <= index)
1087                         break;
1088
1089                 v4l2_video_std_construct(p, curr_id, descr);
1090
1091                 dbgarg(cmd, "index=%d, id=0x%Lx, name=%s, fps=%d/%d, "
1092                                 "framelines=%d\n", p->index,
1093                                 (unsigned long long)p->id, p->name,
1094                                 p->frameperiod.numerator,
1095                                 p->frameperiod.denominator,
1096                                 p->framelines);
1097
1098                 ret = 0;
1099                 break;
1100         }
1101         case VIDIOC_G_STD:
1102         {
1103                 v4l2_std_id *id = arg;
1104
1105                 ret = 0;
1106                 /* Calls the specific handler */
1107                 if (ops->vidioc_g_std)
1108                         ret = ops->vidioc_g_std(file, fh, id);
1109                 else if (vfd->current_norm)
1110                         *id = vfd->current_norm;
1111                 else
1112                         ret = -EINVAL;
1113
1114                 if (!ret)
1115                         dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
1116                 break;
1117         }
1118         case VIDIOC_S_STD:
1119         {
1120                 v4l2_std_id *id = arg, norm;
1121
1122                 dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id);
1123
1124                 norm = (*id) & vfd->tvnorms;
1125                 if (vfd->tvnorms && !norm)      /* Check if std is supported */
1126                         break;
1127
1128                 /* Calls the specific handler */
1129                 if (ops->vidioc_s_std)
1130                         ret = ops->vidioc_s_std(file, fh, &norm);
1131                 else
1132                         ret = -EINVAL;
1133
1134                 /* Updates standard information */
1135                 if (ret >= 0)
1136                         vfd->current_norm = norm;
1137                 break;
1138         }
1139         case VIDIOC_QUERYSTD:
1140         {
1141                 v4l2_std_id *p = arg;
1142
1143                 if (!ops->vidioc_querystd)
1144                         break;
1145                 ret = ops->vidioc_querystd(file, fh, arg);
1146                 if (!ret)
1147                         dbgarg(cmd, "detected std=%08Lx\n",
1148                                                 (unsigned long long)*p);
1149                 break;
1150         }
1151         /* ------ input switching ---------- */
1152         /* FIXME: Inputs can be handled inside videodev2 */
1153         case VIDIOC_ENUMINPUT:
1154         {
1155                 struct v4l2_input *p = arg;
1156
1157                 /*
1158                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1159                  * CAP_STD here based on ioctl handler provided by the
1160                  * driver. If the driver doesn't support these
1161                  * for a specific input, it must override these flags.
1162                  */
1163                 if (ops->vidioc_s_std)
1164                         p->capabilities |= V4L2_IN_CAP_STD;
1165                 if (ops->vidioc_s_dv_preset)
1166                         p->capabilities |= V4L2_IN_CAP_PRESETS;
1167                 if (ops->vidioc_s_dv_timings)
1168                         p->capabilities |= V4L2_IN_CAP_CUSTOM_TIMINGS;
1169
1170                 if (!ops->vidioc_enum_input)
1171                         break;
1172
1173                 ret = ops->vidioc_enum_input(file, fh, p);
1174                 if (!ret)
1175                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1176                                 "audioset=%d, "
1177                                 "tuner=%d, std=%08Lx, status=%d\n",
1178                                 p->index, p->name, p->type, p->audioset,
1179                                 p->tuner,
1180                                 (unsigned long long)p->std,
1181                                 p->status);
1182                 break;
1183         }
1184         case VIDIOC_G_INPUT:
1185         {
1186                 unsigned int *i = arg;
1187
1188                 if (!ops->vidioc_g_input)
1189                         break;
1190                 ret = ops->vidioc_g_input(file, fh, i);
1191                 if (!ret)
1192                         dbgarg(cmd, "value=%d\n", *i);
1193                 break;
1194         }
1195         case VIDIOC_S_INPUT:
1196         {
1197                 unsigned int *i = arg;
1198
1199                 if (!ops->vidioc_s_input)
1200                         break;
1201                 dbgarg(cmd, "value=%d\n", *i);
1202                 ret = ops->vidioc_s_input(file, fh, *i);
1203                 break;
1204         }
1205
1206         /* ------ output switching ---------- */
1207         case VIDIOC_ENUMOUTPUT:
1208         {
1209                 struct v4l2_output *p = arg;
1210
1211                 if (!ops->vidioc_enum_output)
1212                         break;
1213
1214                 /*
1215                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1216                  * CAP_STD here based on ioctl handler provided by the
1217                  * driver. If the driver doesn't support these
1218                  * for a specific output, it must override these flags.
1219                  */
1220                 if (ops->vidioc_s_std)
1221                         p->capabilities |= V4L2_OUT_CAP_STD;
1222                 if (ops->vidioc_s_dv_preset)
1223                         p->capabilities |= V4L2_OUT_CAP_PRESETS;
1224                 if (ops->vidioc_s_dv_timings)
1225                         p->capabilities |= V4L2_OUT_CAP_CUSTOM_TIMINGS;
1226
1227                 ret = ops->vidioc_enum_output(file, fh, p);
1228                 if (!ret)
1229                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1230                                 "audioset=0x%x, "
1231                                 "modulator=%d, std=0x%08Lx\n",
1232                                 p->index, p->name, p->type, p->audioset,
1233                                 p->modulator, (unsigned long long)p->std);
1234                 break;
1235         }
1236         case VIDIOC_G_OUTPUT:
1237         {
1238                 unsigned int *i = arg;
1239
1240                 if (!ops->vidioc_g_output)
1241                         break;
1242                 ret = ops->vidioc_g_output(file, fh, i);
1243                 if (!ret)
1244                         dbgarg(cmd, "value=%d\n", *i);
1245                 break;
1246         }
1247         case VIDIOC_S_OUTPUT:
1248         {
1249                 unsigned int *i = arg;
1250
1251                 if (!ops->vidioc_s_output)
1252                         break;
1253                 dbgarg(cmd, "value=%d\n", *i);
1254                 ret = ops->vidioc_s_output(file, fh, *i);
1255                 break;
1256         }
1257
1258         /* --- controls ---------------------------------------------- */
1259         case VIDIOC_QUERYCTRL:
1260         {
1261                 struct v4l2_queryctrl *p = arg;
1262
1263                 if (vfd->ctrl_handler)
1264                         ret = v4l2_queryctrl(vfd->ctrl_handler, p);
1265                 else if (ops->vidioc_queryctrl)
1266                         ret = ops->vidioc_queryctrl(file, fh, p);
1267                 else
1268                         break;
1269                 if (!ret)
1270                         dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, "
1271                                         "step=%d, default=%d, flags=0x%08x\n",
1272                                         p->id, p->type, p->name,
1273                                         p->minimum, p->maximum,
1274                                         p->step, p->default_value, p->flags);
1275                 else
1276                         dbgarg(cmd, "id=0x%x\n", p->id);
1277                 break;
1278         }
1279         case VIDIOC_G_CTRL:
1280         {
1281                 struct v4l2_control *p = arg;
1282
1283                 if (vfd->ctrl_handler)
1284                         ret = v4l2_g_ctrl(vfd->ctrl_handler, p);
1285                 else if (ops->vidioc_g_ctrl)
1286                         ret = ops->vidioc_g_ctrl(file, fh, p);
1287                 else if (ops->vidioc_g_ext_ctrls) {
1288                         struct v4l2_ext_controls ctrls;
1289                         struct v4l2_ext_control ctrl;
1290
1291                         ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1292                         ctrls.count = 1;
1293                         ctrls.controls = &ctrl;
1294                         ctrl.id = p->id;
1295                         ctrl.value = p->value;
1296                         if (check_ext_ctrls(&ctrls, 1)) {
1297                                 ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
1298                                 if (ret == 0)
1299                                         p->value = ctrl.value;
1300                         }
1301                 } else
1302                         break;
1303                 if (!ret)
1304                         dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1305                 else
1306                         dbgarg(cmd, "id=0x%x\n", p->id);
1307                 break;
1308         }
1309         case VIDIOC_S_CTRL:
1310         {
1311                 struct v4l2_control *p = arg;
1312                 struct v4l2_ext_controls ctrls;
1313                 struct v4l2_ext_control ctrl;
1314
1315                 if (!vfd->ctrl_handler &&
1316                         !ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
1317                         break;
1318
1319                 dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1320
1321                 if (vfd->ctrl_handler) {
1322                         ret = v4l2_s_ctrl(vfd->ctrl_handler, p);
1323                         break;
1324                 }
1325                 if (ops->vidioc_s_ctrl) {
1326                         ret = ops->vidioc_s_ctrl(file, fh, p);
1327                         break;
1328                 }
1329                 if (!ops->vidioc_s_ext_ctrls)
1330                         break;
1331
1332                 ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1333                 ctrls.count = 1;
1334                 ctrls.controls = &ctrl;
1335                 ctrl.id = p->id;
1336                 ctrl.value = p->value;
1337                 if (check_ext_ctrls(&ctrls, 1))
1338                         ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
1339                 break;
1340         }
1341         case VIDIOC_G_EXT_CTRLS:
1342         {
1343                 struct v4l2_ext_controls *p = arg;
1344
1345                 p->error_idx = p->count;
1346                 if (vfd->ctrl_handler)
1347                         ret = v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
1348                 else if (ops->vidioc_g_ext_ctrls && check_ext_ctrls(p, 0))
1349                         ret = ops->vidioc_g_ext_ctrls(file, fh, p);
1350                 else
1351                         break;
1352                 v4l_print_ext_ctrls(cmd, vfd, p, !ret);
1353                 break;
1354         }
1355         case VIDIOC_S_EXT_CTRLS:
1356         {
1357                 struct v4l2_ext_controls *p = arg;
1358
1359                 p->error_idx = p->count;
1360                 if (!vfd->ctrl_handler && !ops->vidioc_s_ext_ctrls)
1361                         break;
1362                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1363                 if (vfd->ctrl_handler)
1364                         ret = v4l2_s_ext_ctrls(vfd->ctrl_handler, p);
1365                 else if (check_ext_ctrls(p, 0))
1366                         ret = ops->vidioc_s_ext_ctrls(file, fh, p);
1367                 break;
1368         }
1369         case VIDIOC_TRY_EXT_CTRLS:
1370         {
1371                 struct v4l2_ext_controls *p = arg;
1372
1373                 p->error_idx = p->count;
1374                 if (!vfd->ctrl_handler && !ops->vidioc_try_ext_ctrls)
1375                         break;
1376                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1377                 if (vfd->ctrl_handler)
1378                         ret = v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
1379                 else if (check_ext_ctrls(p, 0))
1380                         ret = ops->vidioc_try_ext_ctrls(file, fh, p);
1381                 break;
1382         }
1383         case VIDIOC_QUERYMENU:
1384         {
1385                 struct v4l2_querymenu *p = arg;
1386
1387                 if (vfd->ctrl_handler)
1388                         ret = v4l2_querymenu(vfd->ctrl_handler, p);
1389                 else if (ops->vidioc_querymenu)
1390                         ret = ops->vidioc_querymenu(file, fh, p);
1391                 else
1392                         break;
1393                 if (!ret)
1394                         dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
1395                                 p->id, p->index, p->name);
1396                 else
1397                         dbgarg(cmd, "id=0x%x, index=%d\n",
1398                                 p->id, p->index);
1399                 break;
1400         }
1401         /* --- audio ---------------------------------------------- */
1402         case VIDIOC_ENUMAUDIO:
1403         {
1404                 struct v4l2_audio *p = arg;
1405
1406                 if (!ops->vidioc_enumaudio)
1407                         break;
1408                 ret = ops->vidioc_enumaudio(file, fh, p);
1409                 if (!ret)
1410                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1411                                         "mode=0x%x\n", p->index, p->name,
1412                                         p->capability, p->mode);
1413                 else
1414                         dbgarg(cmd, "index=%d\n", p->index);
1415                 break;
1416         }
1417         case VIDIOC_G_AUDIO:
1418         {
1419                 struct v4l2_audio *p = arg;
1420
1421                 if (!ops->vidioc_g_audio)
1422                         break;
1423
1424                 ret = ops->vidioc_g_audio(file, fh, p);
1425                 if (!ret)
1426                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1427                                         "mode=0x%x\n", p->index,
1428                                         p->name, p->capability, p->mode);
1429                 else
1430                         dbgarg(cmd, "index=%d\n", p->index);
1431                 break;
1432         }
1433         case VIDIOC_S_AUDIO:
1434         {
1435                 struct v4l2_audio *p = arg;
1436
1437                 if (!ops->vidioc_s_audio)
1438                         break;
1439                 dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1440                                         "mode=0x%x\n", p->index, p->name,
1441                                         p->capability, p->mode);
1442                 ret = ops->vidioc_s_audio(file, fh, p);
1443                 break;
1444         }
1445         case VIDIOC_ENUMAUDOUT:
1446         {
1447                 struct v4l2_audioout *p = arg;
1448
1449                 if (!ops->vidioc_enumaudout)
1450                         break;
1451                 dbgarg(cmd, "Enum for index=%d\n", p->index);
1452                 ret = ops->vidioc_enumaudout(file, fh, p);
1453                 if (!ret)
1454                         dbgarg2("index=%d, name=%s, capability=%d, "
1455                                         "mode=%d\n", p->index, p->name,
1456                                         p->capability, p->mode);
1457                 break;
1458         }
1459         case VIDIOC_G_AUDOUT:
1460         {
1461                 struct v4l2_audioout *p = arg;
1462
1463                 if (!ops->vidioc_g_audout)
1464                         break;
1465
1466                 ret = ops->vidioc_g_audout(file, fh, p);
1467                 if (!ret)
1468                         dbgarg2("index=%d, name=%s, capability=%d, "
1469                                         "mode=%d\n", p->index, p->name,
1470                                         p->capability, p->mode);
1471                 break;
1472         }
1473         case VIDIOC_S_AUDOUT:
1474         {
1475                 struct v4l2_audioout *p = arg;
1476
1477                 if (!ops->vidioc_s_audout)
1478                         break;
1479                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1480                                         "mode=%d\n", p->index, p->name,
1481                                         p->capability, p->mode);
1482
1483                 ret = ops->vidioc_s_audout(file, fh, p);
1484                 break;
1485         }
1486         case VIDIOC_G_MODULATOR:
1487         {
1488                 struct v4l2_modulator *p = arg;
1489
1490                 if (!ops->vidioc_g_modulator)
1491                         break;
1492                 ret = ops->vidioc_g_modulator(file, fh, p);
1493                 if (!ret)
1494                         dbgarg(cmd, "index=%d, name=%s, "
1495                                         "capability=%d, rangelow=%d,"
1496                                         " rangehigh=%d, txsubchans=%d\n",
1497                                         p->index, p->name, p->capability,
1498                                         p->rangelow, p->rangehigh,
1499                                         p->txsubchans);
1500                 break;
1501         }
1502         case VIDIOC_S_MODULATOR:
1503         {
1504                 struct v4l2_modulator *p = arg;
1505
1506                 if (!ops->vidioc_s_modulator)
1507                         break;
1508                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1509                                 "rangelow=%d, rangehigh=%d, txsubchans=%d\n",
1510                                 p->index, p->name, p->capability, p->rangelow,
1511                                 p->rangehigh, p->txsubchans);
1512                         ret = ops->vidioc_s_modulator(file, fh, p);
1513                 break;
1514         }
1515         case VIDIOC_G_CROP:
1516         {
1517                 struct v4l2_crop *p = arg;
1518
1519                 if (!ops->vidioc_g_crop)
1520                         break;
1521
1522                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1523                 ret = ops->vidioc_g_crop(file, fh, p);
1524                 if (!ret)
1525                         dbgrect(vfd, "", &p->c);
1526                 break;
1527         }
1528         case VIDIOC_S_CROP:
1529         {
1530                 struct v4l2_crop *p = arg;
1531
1532                 if (!ops->vidioc_s_crop)
1533                         break;
1534                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1535                 dbgrect(vfd, "", &p->c);
1536                 ret = ops->vidioc_s_crop(file, fh, p);
1537                 break;
1538         }
1539         case VIDIOC_CROPCAP:
1540         {
1541                 struct v4l2_cropcap *p = arg;
1542
1543                 /*FIXME: Should also show v4l2_fract pixelaspect */
1544                 if (!ops->vidioc_cropcap)
1545                         break;
1546
1547                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1548                 ret = ops->vidioc_cropcap(file, fh, p);
1549                 if (!ret) {
1550                         dbgrect(vfd, "bounds ", &p->bounds);
1551                         dbgrect(vfd, "defrect ", &p->defrect);
1552                 }
1553                 break;
1554         }
1555         case VIDIOC_G_JPEGCOMP:
1556         {
1557                 struct v4l2_jpegcompression *p = arg;
1558
1559                 if (!ops->vidioc_g_jpegcomp)
1560                         break;
1561
1562                 ret = ops->vidioc_g_jpegcomp(file, fh, p);
1563                 if (!ret)
1564                         dbgarg(cmd, "quality=%d, APPn=%d, "
1565                                         "APP_len=%d, COM_len=%d, "
1566                                         "jpeg_markers=%d\n",
1567                                         p->quality, p->APPn, p->APP_len,
1568                                         p->COM_len, p->jpeg_markers);
1569                 break;
1570         }
1571         case VIDIOC_S_JPEGCOMP:
1572         {
1573                 struct v4l2_jpegcompression *p = arg;
1574
1575                 if (!ops->vidioc_g_jpegcomp)
1576                         break;
1577                 dbgarg(cmd, "quality=%d, APPn=%d, APP_len=%d, "
1578                                         "COM_len=%d, jpeg_markers=%d\n",
1579                                         p->quality, p->APPn, p->APP_len,
1580                                         p->COM_len, p->jpeg_markers);
1581                         ret = ops->vidioc_s_jpegcomp(file, fh, p);
1582                 break;
1583         }
1584         case VIDIOC_G_ENC_INDEX:
1585         {
1586                 struct v4l2_enc_idx *p = arg;
1587
1588                 if (!ops->vidioc_g_enc_index)
1589                         break;
1590                 ret = ops->vidioc_g_enc_index(file, fh, p);
1591                 if (!ret)
1592                         dbgarg(cmd, "entries=%d, entries_cap=%d\n",
1593                                         p->entries, p->entries_cap);
1594                 break;
1595         }
1596         case VIDIOC_ENCODER_CMD:
1597         {
1598                 struct v4l2_encoder_cmd *p = arg;
1599
1600                 if (!ops->vidioc_encoder_cmd)
1601                         break;
1602                 ret = ops->vidioc_encoder_cmd(file, fh, p);
1603                 if (!ret)
1604                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1605                 break;
1606         }
1607         case VIDIOC_TRY_ENCODER_CMD:
1608         {
1609                 struct v4l2_encoder_cmd *p = arg;
1610
1611                 if (!ops->vidioc_try_encoder_cmd)
1612                         break;
1613                 ret = ops->vidioc_try_encoder_cmd(file, fh, p);
1614                 if (!ret)
1615                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1616                 break;
1617         }
1618         case VIDIOC_G_PARM:
1619         {
1620                 struct v4l2_streamparm *p = arg;
1621
1622                 if (ops->vidioc_g_parm) {
1623                         ret = check_fmt(ops, p->type);
1624                         if (ret)
1625                                 break;
1626                         ret = ops->vidioc_g_parm(file, fh, p);
1627                 } else {
1628                         v4l2_std_id std = vfd->current_norm;
1629
1630                         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1631                                 break;
1632
1633                         ret = 0;
1634                         if (ops->vidioc_g_std)
1635                                 ret = ops->vidioc_g_std(file, fh, &std);
1636                         else if (std == 0)
1637                                 ret = -EINVAL;
1638                         if (ret == 0)
1639                                 v4l2_video_std_frame_period(std,
1640                                                     &p->parm.capture.timeperframe);
1641                 }
1642
1643                 dbgarg(cmd, "type=%d\n", p->type);
1644                 break;
1645         }
1646         case VIDIOC_S_PARM:
1647         {
1648                 struct v4l2_streamparm *p = arg;
1649
1650                 if (!ops->vidioc_s_parm)
1651                         break;
1652                 ret = check_fmt(ops, p->type);
1653                 if (ret)
1654                         break;
1655
1656                 dbgarg(cmd, "type=%d\n", p->type);
1657                 ret = ops->vidioc_s_parm(file, fh, p);
1658                 break;
1659         }
1660         case VIDIOC_G_TUNER:
1661         {
1662                 struct v4l2_tuner *p = arg;
1663
1664                 if (!ops->vidioc_g_tuner)
1665                         break;
1666
1667                 ret = ops->vidioc_g_tuner(file, fh, p);
1668                 if (!ret)
1669                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1670                                         "capability=0x%x, rangelow=%d, "
1671                                         "rangehigh=%d, signal=%d, afc=%d, "
1672                                         "rxsubchans=0x%x, audmode=%d\n",
1673                                         p->index, p->name, p->type,
1674                                         p->capability, p->rangelow,
1675                                         p->rangehigh, p->signal, p->afc,
1676                                         p->rxsubchans, p->audmode);
1677                 break;
1678         }
1679         case VIDIOC_S_TUNER:
1680         {
1681                 struct v4l2_tuner *p = arg;
1682
1683                 if (!ops->vidioc_s_tuner)
1684                         break;
1685                 dbgarg(cmd, "index=%d, name=%s, type=%d, "
1686                                 "capability=0x%x, rangelow=%d, "
1687                                 "rangehigh=%d, signal=%d, afc=%d, "
1688                                 "rxsubchans=0x%x, audmode=%d\n",
1689                                 p->index, p->name, p->type,
1690                                 p->capability, p->rangelow,
1691                                 p->rangehigh, p->signal, p->afc,
1692                                 p->rxsubchans, p->audmode);
1693                 ret = ops->vidioc_s_tuner(file, fh, p);
1694                 break;
1695         }
1696         case VIDIOC_G_FREQUENCY:
1697         {
1698                 struct v4l2_frequency *p = arg;
1699
1700                 if (!ops->vidioc_g_frequency)
1701                         break;
1702
1703                 ret = ops->vidioc_g_frequency(file, fh, p);
1704                 if (!ret)
1705                         dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1706                                         p->tuner, p->type, p->frequency);
1707                 break;
1708         }
1709         case VIDIOC_S_FREQUENCY:
1710         {
1711                 struct v4l2_frequency *p = arg;
1712
1713                 if (!ops->vidioc_s_frequency)
1714                         break;
1715                 dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1716                                 p->tuner, p->type, p->frequency);
1717                 ret = ops->vidioc_s_frequency(file, fh, p);
1718                 break;
1719         }
1720         case VIDIOC_G_SLICED_VBI_CAP:
1721         {
1722                 struct v4l2_sliced_vbi_cap *p = arg;
1723
1724                 if (!ops->vidioc_g_sliced_vbi_cap)
1725                         break;
1726
1727                 /* Clear up to type, everything after type is zerod already */
1728                 memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
1729
1730                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1731                 ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);
1732                 if (!ret)
1733                         dbgarg2("service_set=%d\n", p->service_set);
1734                 break;
1735         }
1736         case VIDIOC_LOG_STATUS:
1737         {
1738                 if (!ops->vidioc_log_status)
1739                         break;
1740                 ret = ops->vidioc_log_status(file, fh);
1741                 break;
1742         }
1743 #ifdef CONFIG_VIDEO_ADV_DEBUG
1744         case VIDIOC_DBG_G_REGISTER:
1745         {
1746                 struct v4l2_dbg_register *p = arg;
1747
1748                 if (!capable(CAP_SYS_ADMIN))
1749                         ret = -EPERM;
1750                 else if (ops->vidioc_g_register)
1751                         ret = ops->vidioc_g_register(file, fh, p);
1752                 break;
1753         }
1754         case VIDIOC_DBG_S_REGISTER:
1755         {
1756                 struct v4l2_dbg_register *p = arg;
1757
1758                 if (!capable(CAP_SYS_ADMIN))
1759                         ret = -EPERM;
1760                 else if (ops->vidioc_s_register)
1761                         ret = ops->vidioc_s_register(file, fh, p);
1762                 break;
1763         }
1764 #endif
1765         case VIDIOC_DBG_G_CHIP_IDENT:
1766         {
1767                 struct v4l2_dbg_chip_ident *p = arg;
1768
1769                 if (!ops->vidioc_g_chip_ident)
1770                         break;
1771                 p->ident = V4L2_IDENT_NONE;
1772                 p->revision = 0;
1773                 ret = ops->vidioc_g_chip_ident(file, fh, p);
1774                 if (!ret)
1775                         dbgarg(cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
1776                 break;
1777         }
1778         case VIDIOC_S_HW_FREQ_SEEK:
1779         {
1780                 struct v4l2_hw_freq_seek *p = arg;
1781
1782                 if (!ops->vidioc_s_hw_freq_seek)
1783                         break;
1784                 dbgarg(cmd,
1785                         "tuner=%d, type=%d, seek_upward=%d, wrap_around=%d\n",
1786                         p->tuner, p->type, p->seek_upward, p->wrap_around);
1787                 ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
1788                 break;
1789         }
1790         case VIDIOC_ENUM_FRAMESIZES:
1791         {
1792                 struct v4l2_frmsizeenum *p = arg;
1793
1794                 if (!ops->vidioc_enum_framesizes)
1795                         break;
1796
1797                 ret = ops->vidioc_enum_framesizes(file, fh, p);
1798                 dbgarg(cmd,
1799                         "index=%d, pixelformat=%c%c%c%c, type=%d ",
1800                         p->index,
1801                         (p->pixel_format & 0xff),
1802                         (p->pixel_format >>  8) & 0xff,
1803                         (p->pixel_format >> 16) & 0xff,
1804                         (p->pixel_format >> 24) & 0xff,
1805                         p->type);
1806                 switch (p->type) {
1807                 case V4L2_FRMSIZE_TYPE_DISCRETE:
1808                         dbgarg3("width = %d, height=%d\n",
1809                                 p->discrete.width, p->discrete.height);
1810                         break;
1811                 case V4L2_FRMSIZE_TYPE_STEPWISE:
1812                         dbgarg3("min %dx%d, max %dx%d, step %dx%d\n",
1813                                 p->stepwise.min_width,  p->stepwise.min_height,
1814                                 p->stepwise.step_width, p->stepwise.step_height,
1815                                 p->stepwise.max_width,  p->stepwise.max_height);
1816                         break;
1817                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1818                         dbgarg3("continuous\n");
1819                         break;
1820                 default:
1821                         dbgarg3("- Unknown type!\n");
1822                 }
1823
1824                 break;
1825         }
1826         case VIDIOC_ENUM_FRAMEINTERVALS:
1827         {
1828                 struct v4l2_frmivalenum *p = arg;
1829
1830                 if (!ops->vidioc_enum_frameintervals)
1831                         break;
1832
1833                 ret = ops->vidioc_enum_frameintervals(file, fh, p);
1834                 dbgarg(cmd,
1835                         "index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
1836                         p->index, p->pixel_format,
1837                         p->width, p->height, p->type);
1838                 switch (p->type) {
1839                 case V4L2_FRMIVAL_TYPE_DISCRETE:
1840                         dbgarg2("fps=%d/%d\n",
1841                                 p->discrete.numerator,
1842                                 p->discrete.denominator);
1843                         break;
1844                 case V4L2_FRMIVAL_TYPE_STEPWISE:
1845                         dbgarg2("min=%d/%d, max=%d/%d, step=%d/%d\n",
1846                                 p->stepwise.min.numerator,
1847                                 p->stepwise.min.denominator,
1848                                 p->stepwise.max.numerator,
1849                                 p->stepwise.max.denominator,
1850                                 p->stepwise.step.numerator,
1851                                 p->stepwise.step.denominator);
1852                         break;
1853                 case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1854                         dbgarg2("continuous\n");
1855                         break;
1856                 default:
1857                         dbgarg2("- Unknown type!\n");
1858                 }
1859                 break;
1860         }
1861         case VIDIOC_ENUM_DV_PRESETS:
1862         {
1863                 struct v4l2_dv_enum_preset *p = arg;
1864
1865                 if (!ops->vidioc_enum_dv_presets)
1866                         break;
1867
1868                 ret = ops->vidioc_enum_dv_presets(file, fh, p);
1869                 if (!ret)
1870                         dbgarg(cmd,
1871                                 "index=%d, preset=%d, name=%s, width=%d,"
1872                                 " height=%d ",
1873                                 p->index, p->preset, p->name, p->width,
1874                                 p->height);
1875                 break;
1876         }
1877         case VIDIOC_S_DV_PRESET:
1878         {
1879                 struct v4l2_dv_preset *p = arg;
1880
1881                 if (!ops->vidioc_s_dv_preset)
1882                         break;
1883
1884                 dbgarg(cmd, "preset=%d\n", p->preset);
1885                 ret = ops->vidioc_s_dv_preset(file, fh, p);
1886                 break;
1887         }
1888         case VIDIOC_G_DV_PRESET:
1889         {
1890                 struct v4l2_dv_preset *p = arg;
1891
1892                 if (!ops->vidioc_g_dv_preset)
1893                         break;
1894
1895                 ret = ops->vidioc_g_dv_preset(file, fh, p);
1896                 if (!ret)
1897                         dbgarg(cmd, "preset=%d\n", p->preset);
1898                 break;
1899         }
1900         case VIDIOC_QUERY_DV_PRESET:
1901         {
1902                 struct v4l2_dv_preset *p = arg;
1903
1904                 if (!ops->vidioc_query_dv_preset)
1905                         break;
1906
1907                 ret = ops->vidioc_query_dv_preset(file, fh, p);
1908                 if (!ret)
1909                         dbgarg(cmd, "preset=%d\n", p->preset);
1910                 break;
1911         }
1912         case VIDIOC_S_DV_TIMINGS:
1913         {
1914                 struct v4l2_dv_timings *p = arg;
1915
1916                 if (!ops->vidioc_s_dv_timings)
1917                         break;
1918
1919                 switch (p->type) {
1920                 case V4L2_DV_BT_656_1120:
1921                         dbgarg2("bt-656/1120:interlaced=%d, pixelclock=%lld,"
1922                                 " width=%d, height=%d, polarities=%x,"
1923                                 " hfrontporch=%d, hsync=%d, hbackporch=%d,"
1924                                 " vfrontporch=%d, vsync=%d, vbackporch=%d,"
1925                                 " il_vfrontporch=%d, il_vsync=%d,"
1926                                 " il_vbackporch=%d\n",
1927                                 p->bt.interlaced, p->bt.pixelclock,
1928                                 p->bt.width, p->bt.height, p->bt.polarities,
1929                                 p->bt.hfrontporch, p->bt.hsync,
1930                                 p->bt.hbackporch, p->bt.vfrontporch,
1931                                 p->bt.vsync, p->bt.vbackporch,
1932                                 p->bt.il_vfrontporch, p->bt.il_vsync,
1933                                 p->bt.il_vbackporch);
1934                         ret = ops->vidioc_s_dv_timings(file, fh, p);
1935                         break;
1936                 default:
1937                         dbgarg2("Unknown type %d!\n", p->type);
1938                         break;
1939                 }
1940                 break;
1941         }
1942         case VIDIOC_G_DV_TIMINGS:
1943         {
1944                 struct v4l2_dv_timings *p = arg;
1945
1946                 if (!ops->vidioc_g_dv_timings)
1947                         break;
1948
1949                 ret = ops->vidioc_g_dv_timings(file, fh, p);
1950                 if (!ret) {
1951                         switch (p->type) {
1952                         case V4L2_DV_BT_656_1120:
1953                                 dbgarg2("bt-656/1120:interlaced=%d,"
1954                                         " pixelclock=%lld,"
1955                                         " width=%d, height=%d, polarities=%x,"
1956                                         " hfrontporch=%d, hsync=%d,"
1957                                         " hbackporch=%d, vfrontporch=%d,"
1958                                         " vsync=%d, vbackporch=%d,"
1959                                         " il_vfrontporch=%d, il_vsync=%d,"
1960                                         " il_vbackporch=%d\n",
1961                                         p->bt.interlaced, p->bt.pixelclock,
1962                                         p->bt.width, p->bt.height,
1963                                         p->bt.polarities, p->bt.hfrontporch,
1964                                         p->bt.hsync, p->bt.hbackporch,
1965                                         p->bt.vfrontporch, p->bt.vsync,
1966                                         p->bt.vbackporch, p->bt.il_vfrontporch,
1967                                         p->bt.il_vsync, p->bt.il_vbackporch);
1968                                 break;
1969                         default:
1970                                 dbgarg2("Unknown type %d!\n", p->type);
1971                                 break;
1972                         }
1973                 }
1974                 break;
1975         }
1976         case VIDIOC_DQEVENT:
1977         {
1978                 struct v4l2_event *ev = arg;
1979
1980                 if (!ops->vidioc_subscribe_event)
1981                         break;
1982
1983                 ret = v4l2_event_dequeue(fh, ev, file->f_flags & O_NONBLOCK);
1984                 if (ret < 0) {
1985                         dbgarg(cmd, "no pending events?");
1986                         break;
1987                 }
1988                 dbgarg(cmd,
1989                        "pending=%d, type=0x%8.8x, sequence=%d, "
1990                        "timestamp=%lu.%9.9lu ",
1991                        ev->pending, ev->type, ev->sequence,
1992                        ev->timestamp.tv_sec, ev->timestamp.tv_nsec);
1993                 break;
1994         }
1995         case VIDIOC_SUBSCRIBE_EVENT:
1996         {
1997                 struct v4l2_event_subscription *sub = arg;
1998
1999                 if (!ops->vidioc_subscribe_event)
2000                         break;
2001
2002                 ret = ops->vidioc_subscribe_event(fh, sub);
2003                 if (ret < 0) {
2004                         dbgarg(cmd, "failed, ret=%ld", ret);
2005                         break;
2006                 }
2007                 dbgarg(cmd, "type=0x%8.8x", sub->type);
2008                 break;
2009         }
2010         case VIDIOC_UNSUBSCRIBE_EVENT:
2011         {
2012                 struct v4l2_event_subscription *sub = arg;
2013
2014                 if (!ops->vidioc_unsubscribe_event)
2015                         break;
2016
2017                 ret = ops->vidioc_unsubscribe_event(fh, sub);
2018                 if (ret < 0) {
2019                         dbgarg(cmd, "failed, ret=%ld", ret);
2020                         break;
2021                 }
2022                 dbgarg(cmd, "type=0x%8.8x", sub->type);
2023                 break;
2024         }
2025         default:
2026         {
2027                 if (!ops->vidioc_default)
2028                         break;
2029                 ret = ops->vidioc_default(file, fh, cmd, arg);
2030                 break;
2031         }
2032         } /* switch */
2033
2034         if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
2035                 if (ret < 0) {
2036                         v4l_print_ioctl(vfd->name, cmd);
2037                         printk(KERN_CONT " error %ld\n", ret);
2038                 }
2039         }
2040
2041         return ret;
2042 }
2043
2044 /* In some cases, only a few fields are used as input, i.e. when the app sets
2045  * "index" and then the driver fills in the rest of the structure for the thing
2046  * with that index.  We only need to copy up the first non-input field.  */
2047 static unsigned long cmd_input_size(unsigned int cmd)
2048 {
2049         /* Size of structure up to and including 'field' */
2050 #define CMDINSIZE(cmd, type, field)                             \
2051         case VIDIOC_##cmd:                                      \
2052                 return offsetof(struct v4l2_##type, field) +    \
2053                         sizeof(((struct v4l2_##type *)0)->field);
2054
2055         switch (cmd) {
2056                 CMDINSIZE(ENUM_FMT,             fmtdesc,        type);
2057                 CMDINSIZE(G_FMT,                format,         type);
2058                 CMDINSIZE(QUERYBUF,             buffer,         type);
2059                 CMDINSIZE(G_PARM,               streamparm,     type);
2060                 CMDINSIZE(ENUMSTD,              standard,       index);
2061                 CMDINSIZE(ENUMINPUT,            input,          index);
2062                 CMDINSIZE(G_CTRL,               control,        id);
2063                 CMDINSIZE(G_TUNER,              tuner,          index);
2064                 CMDINSIZE(QUERYCTRL,            queryctrl,      id);
2065                 CMDINSIZE(QUERYMENU,            querymenu,      index);
2066                 CMDINSIZE(ENUMOUTPUT,           output,         index);
2067                 CMDINSIZE(G_MODULATOR,          modulator,      index);
2068                 CMDINSIZE(G_FREQUENCY,          frequency,      tuner);
2069                 CMDINSIZE(CROPCAP,              cropcap,        type);
2070                 CMDINSIZE(G_CROP,               crop,           type);
2071                 CMDINSIZE(ENUMAUDIO,            audio,          index);
2072                 CMDINSIZE(ENUMAUDOUT,           audioout,       index);
2073                 CMDINSIZE(ENCODER_CMD,          encoder_cmd,    flags);
2074                 CMDINSIZE(TRY_ENCODER_CMD,      encoder_cmd,    flags);
2075                 CMDINSIZE(G_SLICED_VBI_CAP,     sliced_vbi_cap, type);
2076                 CMDINSIZE(ENUM_FRAMESIZES,      frmsizeenum,    pixel_format);
2077                 CMDINSIZE(ENUM_FRAMEINTERVALS,  frmivalenum,    height);
2078         default:
2079                 return _IOC_SIZE(cmd);
2080         }
2081 }
2082
2083 long video_ioctl2(struct file *file,
2084                unsigned int cmd, unsigned long arg)
2085 {
2086         char    sbuf[128];
2087         void    *mbuf = NULL;
2088         void    *parg = (void *)arg;
2089         long    err  = -EINVAL;
2090         int     is_ext_ctrl;
2091         size_t  ctrls_size = 0;
2092         void __user *user_ptr = NULL;
2093
2094 #ifdef __OLD_VIDIOC_
2095         cmd = video_fix_command(cmd);
2096 #endif
2097         is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
2098                        cmd == VIDIOC_TRY_EXT_CTRLS);
2099
2100         /*  Copy arguments into temp kernel buffer  */
2101         if (_IOC_DIR(cmd) != _IOC_NONE) {
2102                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
2103                         parg = sbuf;
2104                 } else {
2105                         /* too big to allocate from stack */
2106                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
2107                         if (NULL == mbuf)
2108                                 return -ENOMEM;
2109                         parg = mbuf;
2110                 }
2111
2112                 err = -EFAULT;
2113                 if (_IOC_DIR(cmd) & _IOC_WRITE) {
2114                         unsigned long n = cmd_input_size(cmd);
2115
2116                         if (copy_from_user(parg, (void __user *)arg, n))
2117                                 goto out;
2118
2119                         /* zero out anything we don't copy from userspace */
2120                         if (n < _IOC_SIZE(cmd))
2121                                 memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
2122                 } else {
2123                         /* read-only ioctl */
2124                         memset(parg, 0, _IOC_SIZE(cmd));
2125                 }
2126         }
2127
2128         if (is_ext_ctrl) {
2129                 struct v4l2_ext_controls *p = parg;
2130
2131                 /* In case of an error, tell the caller that it wasn't
2132                    a specific control that caused it. */
2133                 p->error_idx = p->count;
2134                 user_ptr = (void __user *)p->controls;
2135                 if (p->count) {
2136                         ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
2137                         /* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
2138                         mbuf = kmalloc(ctrls_size, GFP_KERNEL);
2139                         err = -ENOMEM;
2140                         if (NULL == mbuf)
2141                                 goto out_ext_ctrl;
2142                         err = -EFAULT;
2143                         if (copy_from_user(mbuf, user_ptr, ctrls_size))
2144                                 goto out_ext_ctrl;
2145                         p->controls = mbuf;
2146                 }
2147         }
2148
2149         /* Handles IOCTL */
2150         err = __video_do_ioctl(file, cmd, parg);
2151         if (err == -ENOIOCTLCMD)
2152                 err = -EINVAL;
2153         if (is_ext_ctrl) {
2154                 struct v4l2_ext_controls *p = parg;
2155
2156                 p->controls = (void *)user_ptr;
2157                 if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
2158                         err = -EFAULT;
2159                 goto out_ext_ctrl;
2160         }
2161         if (err < 0)
2162                 goto out;
2163
2164 out_ext_ctrl:
2165         /*  Copy results into user buffer  */
2166         switch (_IOC_DIR(cmd)) {
2167         case _IOC_READ:
2168         case (_IOC_WRITE | _IOC_READ):
2169                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
2170                         err = -EFAULT;
2171                 break;
2172         }
2173
2174 out:
2175         kfree(mbuf);
2176         return err;
2177 }
2178 EXPORT_SYMBOL(video_ioctl2);