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