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