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
1085                         *id = vfd->current_norm;
1086
1087                 if (!ret)
1088                         dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
1089                 break;
1090         }
1091         case VIDIOC_S_STD:
1092         {
1093                 v4l2_std_id *id = arg, norm;
1094
1095                 dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id);
1096
1097                 norm = (*id) & vfd->tvnorms;
1098                 if (vfd->tvnorms && !norm)      /* Check if std is supported */
1099                         break;
1100
1101                 /* Calls the specific handler */
1102                 if (ops->vidioc_s_std)
1103                         ret = ops->vidioc_s_std(file, fh, &norm);
1104                 else
1105                         ret = -EINVAL;
1106
1107                 /* Updates standard information */
1108                 if (ret >= 0)
1109                         vfd->current_norm = norm;
1110                 break;
1111         }
1112         case VIDIOC_QUERYSTD:
1113         {
1114                 v4l2_std_id *p = arg;
1115
1116                 if (!ops->vidioc_querystd)
1117                         break;
1118                 ret = ops->vidioc_querystd(file, fh, arg);
1119                 if (!ret)
1120                         dbgarg(cmd, "detected std=%08Lx\n",
1121                                                 (unsigned long long)*p);
1122                 break;
1123         }
1124         /* ------ input switching ---------- */
1125         /* FIXME: Inputs can be handled inside videodev2 */
1126         case VIDIOC_ENUMINPUT:
1127         {
1128                 struct v4l2_input *p = arg;
1129
1130                 if (!ops->vidioc_enum_input)
1131                         break;
1132
1133                 ret = ops->vidioc_enum_input(file, fh, p);
1134                 if (!ret)
1135                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1136                                 "audioset=%d, "
1137                                 "tuner=%d, std=%08Lx, status=%d\n",
1138                                 p->index, p->name, p->type, p->audioset,
1139                                 p->tuner,
1140                                 (unsigned long long)p->std,
1141                                 p->status);
1142                 break;
1143         }
1144         case VIDIOC_G_INPUT:
1145         {
1146                 unsigned int *i = arg;
1147
1148                 if (!ops->vidioc_g_input)
1149                         break;
1150                 ret = ops->vidioc_g_input(file, fh, i);
1151                 if (!ret)
1152                         dbgarg(cmd, "value=%d\n", *i);
1153                 break;
1154         }
1155         case VIDIOC_S_INPUT:
1156         {
1157                 unsigned int *i = arg;
1158
1159                 if (!ops->vidioc_s_input)
1160                         break;
1161                 dbgarg(cmd, "value=%d\n", *i);
1162                 ret = ops->vidioc_s_input(file, fh, *i);
1163                 break;
1164         }
1165
1166         /* ------ output switching ---------- */
1167         case VIDIOC_ENUMOUTPUT:
1168         {
1169                 struct v4l2_output *p = arg;
1170
1171                 if (!ops->vidioc_enum_output)
1172                         break;
1173
1174                 ret = ops->vidioc_enum_output(file, fh, p);
1175                 if (!ret)
1176                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1177                                 "audioset=0x%x, "
1178                                 "modulator=%d, std=0x%08Lx\n",
1179                                 p->index, p->name, p->type, p->audioset,
1180                                 p->modulator, (unsigned long long)p->std);
1181                 break;
1182         }
1183         case VIDIOC_G_OUTPUT:
1184         {
1185                 unsigned int *i = arg;
1186
1187                 if (!ops->vidioc_g_output)
1188                         break;
1189                 ret = ops->vidioc_g_output(file, fh, i);
1190                 if (!ret)
1191                         dbgarg(cmd, "value=%d\n", *i);
1192                 break;
1193         }
1194         case VIDIOC_S_OUTPUT:
1195         {
1196                 unsigned int *i = arg;
1197
1198                 if (!ops->vidioc_s_output)
1199                         break;
1200                 dbgarg(cmd, "value=%d\n", *i);
1201                 ret = ops->vidioc_s_output(file, fh, *i);
1202                 break;
1203         }
1204
1205         /* --- controls ---------------------------------------------- */
1206         case VIDIOC_QUERYCTRL:
1207         {
1208                 struct v4l2_queryctrl *p = arg;
1209
1210                 if (!ops->vidioc_queryctrl)
1211                         break;
1212                 ret = ops->vidioc_queryctrl(file, fh, p);
1213                 if (!ret)
1214                         dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, "
1215                                         "step=%d, default=%d, flags=0x%08x\n",
1216                                         p->id, p->type, p->name,
1217                                         p->minimum, p->maximum,
1218                                         p->step, p->default_value, p->flags);
1219                 else
1220                         dbgarg(cmd, "id=0x%x\n", p->id);
1221                 break;
1222         }
1223         case VIDIOC_G_CTRL:
1224         {
1225                 struct v4l2_control *p = arg;
1226
1227                 if (ops->vidioc_g_ctrl)
1228                         ret = ops->vidioc_g_ctrl(file, fh, p);
1229                 else if (ops->vidioc_g_ext_ctrls) {
1230                         struct v4l2_ext_controls ctrls;
1231                         struct v4l2_ext_control ctrl;
1232
1233                         ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1234                         ctrls.count = 1;
1235                         ctrls.controls = &ctrl;
1236                         ctrl.id = p->id;
1237                         ctrl.value = p->value;
1238                         if (check_ext_ctrls(&ctrls, 1)) {
1239                                 ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
1240                                 if (ret == 0)
1241                                         p->value = ctrl.value;
1242                         }
1243                 } else
1244                         break;
1245                 if (!ret)
1246                         dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1247                 else
1248                         dbgarg(cmd, "id=0x%x\n", p->id);
1249                 break;
1250         }
1251         case VIDIOC_S_CTRL:
1252         {
1253                 struct v4l2_control *p = arg;
1254                 struct v4l2_ext_controls ctrls;
1255                 struct v4l2_ext_control ctrl;
1256
1257                 if (!ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
1258                         break;
1259
1260                 dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1261
1262                 if (ops->vidioc_s_ctrl) {
1263                         ret = ops->vidioc_s_ctrl(file, fh, p);
1264                         break;
1265                 }
1266                 if (!ops->vidioc_s_ext_ctrls)
1267                         break;
1268
1269                 ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1270                 ctrls.count = 1;
1271                 ctrls.controls = &ctrl;
1272                 ctrl.id = p->id;
1273                 ctrl.value = p->value;
1274                 if (check_ext_ctrls(&ctrls, 1))
1275                         ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
1276                 break;
1277         }
1278         case VIDIOC_G_EXT_CTRLS:
1279         {
1280                 struct v4l2_ext_controls *p = arg;
1281
1282                 p->error_idx = p->count;
1283                 if (!ops->vidioc_g_ext_ctrls)
1284                         break;
1285                 if (check_ext_ctrls(p, 0))
1286                         ret = ops->vidioc_g_ext_ctrls(file, fh, p);
1287                 v4l_print_ext_ctrls(cmd, vfd, p, !ret);
1288                 break;
1289         }
1290         case VIDIOC_S_EXT_CTRLS:
1291         {
1292                 struct v4l2_ext_controls *p = arg;
1293
1294                 p->error_idx = p->count;
1295                 if (!ops->vidioc_s_ext_ctrls)
1296                         break;
1297                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1298                 if (check_ext_ctrls(p, 0))
1299                         ret = ops->vidioc_s_ext_ctrls(file, fh, p);
1300                 break;
1301         }
1302         case VIDIOC_TRY_EXT_CTRLS:
1303         {
1304                 struct v4l2_ext_controls *p = arg;
1305
1306                 p->error_idx = p->count;
1307                 if (!ops->vidioc_try_ext_ctrls)
1308                         break;
1309                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1310                 if (check_ext_ctrls(p, 0))
1311                         ret = ops->vidioc_try_ext_ctrls(file, fh, p);
1312                 break;
1313         }
1314         case VIDIOC_QUERYMENU:
1315         {
1316                 struct v4l2_querymenu *p = arg;
1317
1318                 if (!ops->vidioc_querymenu)
1319                         break;
1320                 ret = ops->vidioc_querymenu(file, fh, p);
1321                 if (!ret)
1322                         dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
1323                                 p->id, p->index, p->name);
1324                 else
1325                         dbgarg(cmd, "id=0x%x, index=%d\n",
1326                                 p->id, p->index);
1327                 break;
1328         }
1329         /* --- audio ---------------------------------------------- */
1330         case VIDIOC_ENUMAUDIO:
1331         {
1332                 struct v4l2_audio *p = arg;
1333
1334                 if (!ops->vidioc_enumaudio)
1335                         break;
1336                 ret = ops->vidioc_enumaudio(file, fh, p);
1337                 if (!ret)
1338                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1339                                         "mode=0x%x\n", p->index, p->name,
1340                                         p->capability, p->mode);
1341                 else
1342                         dbgarg(cmd, "index=%d\n", p->index);
1343                 break;
1344         }
1345         case VIDIOC_G_AUDIO:
1346         {
1347                 struct v4l2_audio *p = arg;
1348
1349                 if (!ops->vidioc_g_audio)
1350                         break;
1351
1352                 ret = ops->vidioc_g_audio(file, fh, p);
1353                 if (!ret)
1354                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1355                                         "mode=0x%x\n", p->index,
1356                                         p->name, p->capability, p->mode);
1357                 else
1358                         dbgarg(cmd, "index=%d\n", p->index);
1359                 break;
1360         }
1361         case VIDIOC_S_AUDIO:
1362         {
1363                 struct v4l2_audio *p = arg;
1364
1365                 if (!ops->vidioc_s_audio)
1366                         break;
1367                 dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1368                                         "mode=0x%x\n", p->index, p->name,
1369                                         p->capability, p->mode);
1370                 ret = ops->vidioc_s_audio(file, fh, p);
1371                 break;
1372         }
1373         case VIDIOC_ENUMAUDOUT:
1374         {
1375                 struct v4l2_audioout *p = arg;
1376
1377                 if (!ops->vidioc_enumaudout)
1378                         break;
1379                 dbgarg(cmd, "Enum for index=%d\n", p->index);
1380                 ret = ops->vidioc_enumaudout(file, fh, p);
1381                 if (!ret)
1382                         dbgarg2("index=%d, name=%s, capability=%d, "
1383                                         "mode=%d\n", p->index, p->name,
1384                                         p->capability, p->mode);
1385                 break;
1386         }
1387         case VIDIOC_G_AUDOUT:
1388         {
1389                 struct v4l2_audioout *p = arg;
1390
1391                 if (!ops->vidioc_g_audout)
1392                         break;
1393
1394                 ret = ops->vidioc_g_audout(file, fh, p);
1395                 if (!ret)
1396                         dbgarg2("index=%d, name=%s, capability=%d, "
1397                                         "mode=%d\n", p->index, p->name,
1398                                         p->capability, p->mode);
1399                 break;
1400         }
1401         case VIDIOC_S_AUDOUT:
1402         {
1403                 struct v4l2_audioout *p = arg;
1404
1405                 if (!ops->vidioc_s_audout)
1406                         break;
1407                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1408                                         "mode=%d\n", p->index, p->name,
1409                                         p->capability, p->mode);
1410
1411                 ret = ops->vidioc_s_audout(file, fh, p);
1412                 break;
1413         }
1414         case VIDIOC_G_MODULATOR:
1415         {
1416                 struct v4l2_modulator *p = arg;
1417
1418                 if (!ops->vidioc_g_modulator)
1419                         break;
1420                 ret = ops->vidioc_g_modulator(file, fh, p);
1421                 if (!ret)
1422                         dbgarg(cmd, "index=%d, name=%s, "
1423                                         "capability=%d, rangelow=%d,"
1424                                         " rangehigh=%d, txsubchans=%d\n",
1425                                         p->index, p->name, p->capability,
1426                                         p->rangelow, p->rangehigh,
1427                                         p->txsubchans);
1428                 break;
1429         }
1430         case VIDIOC_S_MODULATOR:
1431         {
1432                 struct v4l2_modulator *p = arg;
1433
1434                 if (!ops->vidioc_s_modulator)
1435                         break;
1436                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1437                                 "rangelow=%d, rangehigh=%d, txsubchans=%d\n",
1438                                 p->index, p->name, p->capability, p->rangelow,
1439                                 p->rangehigh, p->txsubchans);
1440                         ret = ops->vidioc_s_modulator(file, fh, p);
1441                 break;
1442         }
1443         case VIDIOC_G_CROP:
1444         {
1445                 struct v4l2_crop *p = arg;
1446
1447                 if (!ops->vidioc_g_crop)
1448                         break;
1449
1450                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1451                 ret = ops->vidioc_g_crop(file, fh, p);
1452                 if (!ret)
1453                         dbgrect(vfd, "", &p->c);
1454                 break;
1455         }
1456         case VIDIOC_S_CROP:
1457         {
1458                 struct v4l2_crop *p = arg;
1459
1460                 if (!ops->vidioc_s_crop)
1461                         break;
1462                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1463                 dbgrect(vfd, "", &p->c);
1464                 ret = ops->vidioc_s_crop(file, fh, p);
1465                 break;
1466         }
1467         case VIDIOC_CROPCAP:
1468         {
1469                 struct v4l2_cropcap *p = arg;
1470
1471                 /*FIXME: Should also show v4l2_fract pixelaspect */
1472                 if (!ops->vidioc_cropcap)
1473                         break;
1474
1475                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1476                 ret = ops->vidioc_cropcap(file, fh, p);
1477                 if (!ret) {
1478                         dbgrect(vfd, "bounds ", &p->bounds);
1479                         dbgrect(vfd, "defrect ", &p->defrect);
1480                 }
1481                 break;
1482         }
1483         case VIDIOC_G_JPEGCOMP:
1484         {
1485                 struct v4l2_jpegcompression *p = arg;
1486
1487                 if (!ops->vidioc_g_jpegcomp)
1488                         break;
1489
1490                 ret = ops->vidioc_g_jpegcomp(file, fh, p);
1491                 if (!ret)
1492                         dbgarg(cmd, "quality=%d, APPn=%d, "
1493                                         "APP_len=%d, COM_len=%d, "
1494                                         "jpeg_markers=%d\n",
1495                                         p->quality, p->APPn, p->APP_len,
1496                                         p->COM_len, p->jpeg_markers);
1497                 break;
1498         }
1499         case VIDIOC_S_JPEGCOMP:
1500         {
1501                 struct v4l2_jpegcompression *p = arg;
1502
1503                 if (!ops->vidioc_g_jpegcomp)
1504                         break;
1505                 dbgarg(cmd, "quality=%d, APPn=%d, APP_len=%d, "
1506                                         "COM_len=%d, jpeg_markers=%d\n",
1507                                         p->quality, p->APPn, p->APP_len,
1508                                         p->COM_len, p->jpeg_markers);
1509                         ret = ops->vidioc_s_jpegcomp(file, fh, p);
1510                 break;
1511         }
1512         case VIDIOC_G_ENC_INDEX:
1513         {
1514                 struct v4l2_enc_idx *p = arg;
1515
1516                 if (!ops->vidioc_g_enc_index)
1517                         break;
1518                 ret = ops->vidioc_g_enc_index(file, fh, p);
1519                 if (!ret)
1520                         dbgarg(cmd, "entries=%d, entries_cap=%d\n",
1521                                         p->entries, p->entries_cap);
1522                 break;
1523         }
1524         case VIDIOC_ENCODER_CMD:
1525         {
1526                 struct v4l2_encoder_cmd *p = arg;
1527
1528                 if (!ops->vidioc_encoder_cmd)
1529                         break;
1530                 ret = ops->vidioc_encoder_cmd(file, fh, p);
1531                 if (!ret)
1532                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1533                 break;
1534         }
1535         case VIDIOC_TRY_ENCODER_CMD:
1536         {
1537                 struct v4l2_encoder_cmd *p = arg;
1538
1539                 if (!ops->vidioc_try_encoder_cmd)
1540                         break;
1541                 ret = ops->vidioc_try_encoder_cmd(file, fh, p);
1542                 if (!ret)
1543                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1544                 break;
1545         }
1546         case VIDIOC_G_PARM:
1547         {
1548                 struct v4l2_streamparm *p = arg;
1549
1550                 if (ops->vidioc_g_parm) {
1551                         ret = check_fmt(ops, p->type);
1552                         if (ret)
1553                                 break;
1554                         ret = ops->vidioc_g_parm(file, fh, p);
1555                 } else {
1556                         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1557                                 return -EINVAL;
1558
1559                         v4l2_video_std_frame_period(vfd->current_norm,
1560                                                     &p->parm.capture.timeperframe);
1561                         ret = 0;
1562                 }
1563
1564                 dbgarg(cmd, "type=%d\n", p->type);
1565                 break;
1566         }
1567         case VIDIOC_S_PARM:
1568         {
1569                 struct v4l2_streamparm *p = arg;
1570
1571                 if (!ops->vidioc_s_parm)
1572                         break;
1573                 ret = check_fmt(ops, p->type);
1574                 if (ret)
1575                         break;
1576
1577                 dbgarg(cmd, "type=%d\n", p->type);
1578                 ret = ops->vidioc_s_parm(file, fh, p);
1579                 break;
1580         }
1581         case VIDIOC_G_TUNER:
1582         {
1583                 struct v4l2_tuner *p = arg;
1584
1585                 if (!ops->vidioc_g_tuner)
1586                         break;
1587
1588                 ret = ops->vidioc_g_tuner(file, fh, p);
1589                 if (!ret)
1590                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1591                                         "capability=0x%x, rangelow=%d, "
1592                                         "rangehigh=%d, signal=%d, afc=%d, "
1593                                         "rxsubchans=0x%x, audmode=%d\n",
1594                                         p->index, p->name, p->type,
1595                                         p->capability, p->rangelow,
1596                                         p->rangehigh, p->signal, p->afc,
1597                                         p->rxsubchans, p->audmode);
1598                 break;
1599         }
1600         case VIDIOC_S_TUNER:
1601         {
1602                 struct v4l2_tuner *p = arg;
1603
1604                 if (!ops->vidioc_s_tuner)
1605                         break;
1606                 dbgarg(cmd, "index=%d, name=%s, type=%d, "
1607                                 "capability=0x%x, rangelow=%d, "
1608                                 "rangehigh=%d, signal=%d, afc=%d, "
1609                                 "rxsubchans=0x%x, audmode=%d\n",
1610                                 p->index, p->name, p->type,
1611                                 p->capability, p->rangelow,
1612                                 p->rangehigh, p->signal, p->afc,
1613                                 p->rxsubchans, p->audmode);
1614                 ret = ops->vidioc_s_tuner(file, fh, p);
1615                 break;
1616         }
1617         case VIDIOC_G_FREQUENCY:
1618         {
1619                 struct v4l2_frequency *p = arg;
1620
1621                 if (!ops->vidioc_g_frequency)
1622                         break;
1623
1624                 ret = ops->vidioc_g_frequency(file, fh, p);
1625                 if (!ret)
1626                         dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1627                                         p->tuner, p->type, p->frequency);
1628                 break;
1629         }
1630         case VIDIOC_S_FREQUENCY:
1631         {
1632                 struct v4l2_frequency *p = arg;
1633
1634                 if (!ops->vidioc_s_frequency)
1635                         break;
1636                 dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1637                                 p->tuner, p->type, p->frequency);
1638                 ret = ops->vidioc_s_frequency(file, fh, p);
1639                 break;
1640         }
1641         case VIDIOC_G_SLICED_VBI_CAP:
1642         {
1643                 struct v4l2_sliced_vbi_cap *p = arg;
1644
1645                 if (!ops->vidioc_g_sliced_vbi_cap)
1646                         break;
1647
1648                 /* Clear up to type, everything after type is zerod already */
1649                 memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
1650
1651                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1652                 ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);
1653                 if (!ret)
1654                         dbgarg2("service_set=%d\n", p->service_set);
1655                 break;
1656         }
1657         case VIDIOC_LOG_STATUS:
1658         {
1659                 if (!ops->vidioc_log_status)
1660                         break;
1661                 ret = ops->vidioc_log_status(file, fh);
1662                 break;
1663         }
1664 #ifdef CONFIG_VIDEO_ADV_DEBUG
1665         case VIDIOC_DBG_G_REGISTER:
1666         {
1667                 struct v4l2_dbg_register *p = arg;
1668
1669                 if (!capable(CAP_SYS_ADMIN))
1670                         ret = -EPERM;
1671                 else if (ops->vidioc_g_register)
1672                         ret = ops->vidioc_g_register(file, fh, p);
1673                 break;
1674         }
1675         case VIDIOC_DBG_S_REGISTER:
1676         {
1677                 struct v4l2_dbg_register *p = arg;
1678
1679                 if (!capable(CAP_SYS_ADMIN))
1680                         ret = -EPERM;
1681                 else if (ops->vidioc_s_register)
1682                         ret = ops->vidioc_s_register(file, fh, p);
1683                 break;
1684         }
1685 #endif
1686         case VIDIOC_DBG_G_CHIP_IDENT:
1687         {
1688                 struct v4l2_dbg_chip_ident *p = arg;
1689
1690                 if (!ops->vidioc_g_chip_ident)
1691                         break;
1692                 p->ident = V4L2_IDENT_NONE;
1693                 p->revision = 0;
1694                 ret = ops->vidioc_g_chip_ident(file, fh, p);
1695                 if (!ret)
1696                         dbgarg(cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
1697                 break;
1698         }
1699         case VIDIOC_S_HW_FREQ_SEEK:
1700         {
1701                 struct v4l2_hw_freq_seek *p = arg;
1702
1703                 if (!ops->vidioc_s_hw_freq_seek)
1704                         break;
1705                 dbgarg(cmd,
1706                         "tuner=%d, type=%d, seek_upward=%d, wrap_around=%d\n",
1707                         p->tuner, p->type, p->seek_upward, p->wrap_around);
1708                 ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
1709                 break;
1710         }
1711         case VIDIOC_ENUM_FRAMESIZES:
1712         {
1713                 struct v4l2_frmsizeenum *p = arg;
1714
1715                 if (!ops->vidioc_enum_framesizes)
1716                         break;
1717
1718                 ret = ops->vidioc_enum_framesizes(file, fh, p);
1719                 dbgarg(cmd,
1720                         "index=%d, pixelformat=%d, type=%d ",
1721                         p->index, p->pixel_format, p->type);
1722                 switch (p->type) {
1723                 case V4L2_FRMSIZE_TYPE_DISCRETE:
1724                         dbgarg2("width = %d, height=%d\n",
1725                                 p->discrete.width, p->discrete.height);
1726                         break;
1727                 case V4L2_FRMSIZE_TYPE_STEPWISE:
1728                         dbgarg2("min %dx%d, max %dx%d, step %dx%d\n",
1729                                 p->stepwise.min_width,  p->stepwise.min_height,
1730                                 p->stepwise.step_width, p->stepwise.step_height,
1731                                 p->stepwise.max_width,  p->stepwise.max_height);
1732                         break;
1733                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1734                         dbgarg2("continuous\n");
1735                         break;
1736                 default:
1737                         dbgarg2("- Unknown type!\n");
1738                 }
1739
1740                 break;
1741         }
1742         case VIDIOC_ENUM_FRAMEINTERVALS:
1743         {
1744                 struct v4l2_frmivalenum *p = arg;
1745
1746                 if (!ops->vidioc_enum_frameintervals)
1747                         break;
1748
1749                 ret = ops->vidioc_enum_frameintervals(file, fh, p);
1750                 dbgarg(cmd,
1751                         "index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
1752                         p->index, p->pixel_format,
1753                         p->width, p->height, p->type);
1754                 switch (p->type) {
1755                 case V4L2_FRMIVAL_TYPE_DISCRETE:
1756                         dbgarg2("fps=%d/%d\n",
1757                                 p->discrete.numerator,
1758                                 p->discrete.denominator);
1759                         break;
1760                 case V4L2_FRMIVAL_TYPE_STEPWISE:
1761                         dbgarg2("min=%d/%d, max=%d/%d, step=%d/%d\n",
1762                                 p->stepwise.min.numerator,
1763                                 p->stepwise.min.denominator,
1764                                 p->stepwise.max.numerator,
1765                                 p->stepwise.max.denominator,
1766                                 p->stepwise.step.numerator,
1767                                 p->stepwise.step.denominator);
1768                         break;
1769                 case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1770                         dbgarg2("continuous\n");
1771                         break;
1772                 default:
1773                         dbgarg2("- Unknown type!\n");
1774                 }
1775                 break;
1776         }
1777
1778         default:
1779         {
1780                 if (!ops->vidioc_default)
1781                         break;
1782                 ret = ops->vidioc_default(file, fh, cmd, arg);
1783                 break;
1784         }
1785         } /* switch */
1786
1787         if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
1788                 if (ret < 0) {
1789                         v4l_print_ioctl(vfd->name, cmd);
1790                         printk(KERN_CONT " error %ld\n", ret);
1791                 }
1792         }
1793
1794         return ret;
1795 }
1796
1797 /* In some cases, only a few fields are used as input, i.e. when the app sets
1798  * "index" and then the driver fills in the rest of the structure for the thing
1799  * with that index.  We only need to copy up the first non-input field.  */
1800 static unsigned long cmd_input_size(unsigned int cmd)
1801 {
1802         /* Size of structure up to and including 'field' */
1803 #define CMDINSIZE(cmd, type, field)                             \
1804         case VIDIOC_##cmd:                                      \
1805                 return offsetof(struct v4l2_##type, field) +    \
1806                         sizeof(((struct v4l2_##type *)0)->field);
1807
1808         switch (cmd) {
1809                 CMDINSIZE(ENUM_FMT,             fmtdesc,        type);
1810                 CMDINSIZE(G_FMT,                format,         type);
1811                 CMDINSIZE(QUERYBUF,             buffer,         type);
1812                 CMDINSIZE(G_PARM,               streamparm,     type);
1813                 CMDINSIZE(ENUMSTD,              standard,       index);
1814                 CMDINSIZE(ENUMINPUT,            input,          index);
1815                 CMDINSIZE(G_CTRL,               control,        id);
1816                 CMDINSIZE(G_TUNER,              tuner,          index);
1817                 CMDINSIZE(QUERYCTRL,            queryctrl,      id);
1818                 CMDINSIZE(QUERYMENU,            querymenu,      index);
1819                 CMDINSIZE(ENUMOUTPUT,           output,         index);
1820                 CMDINSIZE(G_MODULATOR,          modulator,      index);
1821                 CMDINSIZE(G_FREQUENCY,          frequency,      tuner);
1822                 CMDINSIZE(CROPCAP,              cropcap,        type);
1823                 CMDINSIZE(G_CROP,               crop,           type);
1824                 CMDINSIZE(ENUMAUDIO,            audio,          index);
1825                 CMDINSIZE(ENUMAUDOUT,           audioout,       index);
1826                 CMDINSIZE(ENCODER_CMD,          encoder_cmd,    flags);
1827                 CMDINSIZE(TRY_ENCODER_CMD,      encoder_cmd,    flags);
1828                 CMDINSIZE(G_SLICED_VBI_CAP,     sliced_vbi_cap, type);
1829                 CMDINSIZE(ENUM_FRAMESIZES,      frmsizeenum,    pixel_format);
1830                 CMDINSIZE(ENUM_FRAMEINTERVALS,  frmivalenum,    height);
1831         default:
1832                 return _IOC_SIZE(cmd);
1833         }
1834 }
1835
1836 long video_ioctl2(struct file *file,
1837                unsigned int cmd, unsigned long arg)
1838 {
1839         char    sbuf[128];
1840         void    *mbuf = NULL;
1841         void    *parg = NULL;
1842         long    err  = -EINVAL;
1843         int     is_ext_ctrl;
1844         size_t  ctrls_size = 0;
1845         void __user *user_ptr = NULL;
1846
1847 #ifdef __OLD_VIDIOC_
1848         cmd = video_fix_command(cmd);
1849 #endif
1850         is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
1851                        cmd == VIDIOC_TRY_EXT_CTRLS);
1852
1853         /*  Copy arguments into temp kernel buffer  */
1854         if (_IOC_DIR(cmd) != _IOC_NONE) {
1855                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
1856                         parg = sbuf;
1857                 } else {
1858                         /* too big to allocate from stack */
1859                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
1860                         if (NULL == mbuf)
1861                                 return -ENOMEM;
1862                         parg = mbuf;
1863                 }
1864
1865                 err = -EFAULT;
1866                 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1867                         unsigned long n = cmd_input_size(cmd);
1868
1869                         if (copy_from_user(parg, (void __user *)arg, n))
1870                                 goto out;
1871
1872                         /* zero out anything we don't copy from userspace */
1873                         if (n < _IOC_SIZE(cmd))
1874                                 memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
1875                 } else {
1876                         /* read-only ioctl */
1877                         memset(parg, 0, _IOC_SIZE(cmd));
1878                 }
1879         }
1880
1881         if (is_ext_ctrl) {
1882                 struct v4l2_ext_controls *p = parg;
1883
1884                 /* In case of an error, tell the caller that it wasn't
1885                    a specific control that caused it. */
1886                 p->error_idx = p->count;
1887                 user_ptr = (void __user *)p->controls;
1888                 if (p->count) {
1889                         ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
1890                         /* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
1891                         mbuf = kmalloc(ctrls_size, GFP_KERNEL);
1892                         err = -ENOMEM;
1893                         if (NULL == mbuf)
1894                                 goto out_ext_ctrl;
1895                         err = -EFAULT;
1896                         if (copy_from_user(mbuf, user_ptr, ctrls_size))
1897                                 goto out_ext_ctrl;
1898                         p->controls = mbuf;
1899                 }
1900         }
1901
1902         /* Handles IOCTL */
1903         err = __video_do_ioctl(file, cmd, parg);
1904         if (err == -ENOIOCTLCMD)
1905                 err = -EINVAL;
1906         if (is_ext_ctrl) {
1907                 struct v4l2_ext_controls *p = parg;
1908
1909                 p->controls = (void *)user_ptr;
1910                 if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
1911                         err = -EFAULT;
1912                 goto out_ext_ctrl;
1913         }
1914         if (err < 0)
1915                 goto out;
1916
1917 out_ext_ctrl:
1918         /*  Copy results into user buffer  */
1919         switch (_IOC_DIR(cmd)) {
1920         case _IOC_READ:
1921         case (_IOC_WRITE | _IOC_READ):
1922                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
1923                         err = -EFAULT;
1924                 break;
1925         }
1926
1927 out:
1928         kfree(mbuf);
1929         return err;
1930 }
1931 EXPORT_SYMBOL(video_ioctl2);