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