drivers/media/video/v4l2-ioctl.c

   1 /*
   2  * Video capture interface for Linux version 2
   3  *
   4  * A generic framework to process V4L2 ioctl commands.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  * Authors:     Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
  12  *              Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/version.h>
  20
  21 #include <linux/videodev2.h>
  22
  23 #include <media/v4l2-common.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/v4l2-ctrls.h>
  26 #include <media/v4l2-fh.h>
  27 #include <media/v4l2-event.h>
  28 #include <media/v4l2-device.h>
  29 #include <media/v4l2-chip-ident.h>
  30
  31 #define dbgarg(cmd, fmt, arg...) \
  32                 do {                                                    \
  33                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {            \
  34                         printk(KERN_DEBUG "%s: ",  vfd->name);          \
  35                         v4l_printk_ioctl(cmd);                          \
  36                         printk(" " fmt,  ## arg);                       \
  37                     }                                                   \
  38                 } while (0)
  39
  40 #define dbgarg2(fmt, arg...) \
  41                 do {                                                    \
  42                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
  43                         printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\
  44                 } while (0)
  45
  46 #define dbgarg3(fmt, arg...) \
  47                 do {                                                    \
  48                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
  49                         printk(KERN_CONT "%s: " fmt, vfd->name, ## arg);\
  50                 } while (0)
  51
  52 /* Zero out the end of the struct pointed to by p.  Everything after, but
  53  * not including, the specified field is cleared. */
  54 #define CLEAR_AFTER_FIELD(p, field) \
  55         memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
  56         0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
  57
  58 struct std_descr {
  59         v4l2_std_id std;
  60         const char *descr;
  61 };
  62
  63 static const struct std_descr standards[] = {
  64         { V4L2_STD_NTSC,        "NTSC"      },
  65         { V4L2_STD_NTSC_M,      "NTSC-M"    },
  66         { V4L2_STD_NTSC_M_JP,   "NTSC-M-JP" },
  67         { V4L2_STD_NTSC_M_KR,   "NTSC-M-KR" },
  68         { V4L2_STD_NTSC_443,    "NTSC-443"  },
  69         { V4L2_STD_PAL,         "PAL"       },
  70         { V4L2_STD_PAL_BG,      "PAL-BG"    },
  71         { V4L2_STD_PAL_B,       "PAL-B"     },
  72         { V4L2_STD_PAL_B1,      "PAL-B1"    },
  73         { V4L2_STD_PAL_G,       "PAL-G"     },
  74         { V4L2_STD_PAL_H,       "PAL-H"     },
  75         { V4L2_STD_PAL_I,       "PAL-I"     },
  76         { V4L2_STD_PAL_DK,      "PAL-DK"    },
  77         { V4L2_STD_PAL_D,       "PAL-D"     },
  78         { V4L2_STD_PAL_D1,      "PAL-D1"    },
  79         { V4L2_STD_PAL_K,       "PAL-K"     },
  80         { V4L2_STD_PAL_M,       "PAL-M"     },
  81         { V4L2_STD_PAL_N,       "PAL-N"     },
  82         { V4L2_STD_PAL_Nc,      "PAL-Nc"    },
  83         { V4L2_STD_PAL_60,      "PAL-60"    },
  84         { V4L2_STD_SECAM,       "SECAM"     },
  85         { V4L2_STD_SECAM_B,     "SECAM-B"   },
  86         { V4L2_STD_SECAM_G,     "SECAM-G"   },
  87         { V4L2_STD_SECAM_H,     "SECAM-H"   },
  88         { V4L2_STD_SECAM_DK,    "SECAM-DK"  },
  89         { V4L2_STD_SECAM_D,     "SECAM-D"   },
  90         { V4L2_STD_SECAM_K,     "SECAM-K"   },
  91         { V4L2_STD_SECAM_K1,    "SECAM-K1"  },
  92         { V4L2_STD_SECAM_L,     "SECAM-L"   },
  93         { V4L2_STD_SECAM_LC,    "SECAM-Lc"  },
  94         { 0,                    "Unknown"   }
  95 };
  96
  97 /* video4linux standard ID conversion to standard name
  98  */
  99 const char *v4l2_norm_to_name(v4l2_std_id id)
 100 {
 101         u32 myid = id;
 102         int i;
 103
 104         /* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
 105            64 bit comparations. So, on that architecture, with some gcc
 106            variants, compilation fails. Currently, the max value is 30bit wide.
 107          */
 108         BUG_ON(myid != id);
 109
 110         for (i = 0; standards[i].std; i++)
 111                 if (myid == standards[i].std)
 112                         break;
 113         return standards[i].descr;
 114 }
 115 EXPORT_SYMBOL(v4l2_norm_to_name);
 116
 117 /* Returns frame period for the given standard */
 118 void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
 119 {
 120         if (id & V4L2_STD_525_60) {
 121                 frameperiod->numerator = 1001;
 122                 frameperiod->denominator = 30000;
 123         } else {
 124                 frameperiod->numerator = 1;
 125                 frameperiod->denominator = 25;
 126         }
 127 }
 128 EXPORT_SYMBOL(v4l2_video_std_frame_period);
 129
 130 /* Fill in the fields of a v4l2_standard structure according to the
 131    'id' and 'transmission' parameters.  Returns negative on error.  */
 132 int v4l2_video_std_construct(struct v4l2_standard *vs,
 133                              int id, const char *name)
 134 {
 135         vs->id = id;
 136         v4l2_video_std_frame_period(id, &vs->frameperiod);
 137         vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
 138         strlcpy(vs->name, name, sizeof(vs->name));
 139         return 0;
 140 }
 141 EXPORT_SYMBOL(v4l2_video_std_construct);
 142
 143 /* ----------------------------------------------------------------- */
 144 /* some arrays for pretty-printing debug messages of enum types      */
 145
 146 const char *v4l2_field_names[] = {
 147         [V4L2_FIELD_ANY]        = "any",
 148         [V4L2_FIELD_NONE]       = "none",
 149         [V4L2_FIELD_TOP]        = "top",
 150         [V4L2_FIELD_BOTTOM]     = "bottom",
 151         [V4L2_FIELD_INTERLACED] = "interlaced",
 152         [V4L2_FIELD_SEQ_TB]     = "seq-tb",
 153         [V4L2_FIELD_SEQ_BT]     = "seq-bt",
 154         [V4L2_FIELD_ALTERNATE]  = "alternate",
 155         [V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
 156         [V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
 157 };
 158 EXPORT_SYMBOL(v4l2_field_names);
 159
 160 const char *v4l2_type_names[] = {
 161         [V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
 162         [V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
 163         [V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
 164         [V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
 165         [V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
 166         [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
 167         [V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
 168         [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
 169         [V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE] = "vid-cap-mplane",
 170         [V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE] = "vid-out-mplane",
 171 };
 172 EXPORT_SYMBOL(v4l2_type_names);
 173
 174 static const char *v4l2_memory_names[] = {
 175         [V4L2_MEMORY_MMAP]    = "mmap",
 176         [V4L2_MEMORY_USERPTR] = "userptr",
 177         [V4L2_MEMORY_OVERLAY] = "overlay",
 178 };
 179
 180 #define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \
 181                            arr[a] : "unknown")
 182
 183 /* ------------------------------------------------------------------ */
 184 /* debug help functions                                               */
 185
 186 struct v4l2_ioctl_info {
 187         unsigned int ioctl;
 188         u16 flags;
 189         const char * const name;
 190 };
 191
 192 /* This control needs a priority check */
 193 #define INFO_FL_PRIO    (1 << 0)
 194 /* This control can be valid if the filehandle passes a control handler. */
 195 #define INFO_FL_CTRL    (1 << 1)
 196
 197 #define IOCTL_INFO(_ioctl, _flags) [_IOC_NR(_ioctl)] = {        \
 198         .ioctl = _ioctl,                                        \
 199         .flags = _flags,                                        \
 200         .name = #_ioctl,                                        \
 201 }
 202
 203 static struct v4l2_ioctl_info v4l2_ioctls[] = {
 204         IOCTL_INFO(VIDIOC_QUERYCAP, 0),
 205         IOCTL_INFO(VIDIOC_ENUM_FMT, 0),
 206         IOCTL_INFO(VIDIOC_G_FMT, 0),
 207         IOCTL_INFO(VIDIOC_S_FMT, INFO_FL_PRIO),
 208         IOCTL_INFO(VIDIOC_REQBUFS, INFO_FL_PRIO),
 209         IOCTL_INFO(VIDIOC_QUERYBUF, 0),
 210         IOCTL_INFO(VIDIOC_G_FBUF, 0),
 211         IOCTL_INFO(VIDIOC_S_FBUF, INFO_FL_PRIO),
 212         IOCTL_INFO(VIDIOC_OVERLAY, INFO_FL_PRIO),
 213         IOCTL_INFO(VIDIOC_QBUF, 0),
 214         IOCTL_INFO(VIDIOC_DQBUF, 0),
 215         IOCTL_INFO(VIDIOC_STREAMON, INFO_FL_PRIO),
 216         IOCTL_INFO(VIDIOC_STREAMOFF, INFO_FL_PRIO),
 217         IOCTL_INFO(VIDIOC_G_PARM, 0),
 218         IOCTL_INFO(VIDIOC_S_PARM, INFO_FL_PRIO),
 219         IOCTL_INFO(VIDIOC_G_STD, 0),
 220         IOCTL_INFO(VIDIOC_S_STD, INFO_FL_PRIO),
 221         IOCTL_INFO(VIDIOC_ENUMSTD, 0),
 222         IOCTL_INFO(VIDIOC_ENUMINPUT, 0),
 223         IOCTL_INFO(VIDIOC_G_CTRL, INFO_FL_CTRL),
 224         IOCTL_INFO(VIDIOC_S_CTRL, INFO_FL_PRIO | INFO_FL_CTRL),
 225         IOCTL_INFO(VIDIOC_G_TUNER, 0),
 226         IOCTL_INFO(VIDIOC_S_TUNER, INFO_FL_PRIO),
 227         IOCTL_INFO(VIDIOC_G_AUDIO, 0),
 228         IOCTL_INFO(VIDIOC_S_AUDIO, INFO_FL_PRIO),
 229         IOCTL_INFO(VIDIOC_QUERYCTRL, INFO_FL_CTRL),
 230         IOCTL_INFO(VIDIOC_QUERYMENU, INFO_FL_CTRL),
 231         IOCTL_INFO(VIDIOC_G_INPUT, 0),
 232         IOCTL_INFO(VIDIOC_S_INPUT, INFO_FL_PRIO),
 233         IOCTL_INFO(VIDIOC_G_OUTPUT, 0),
 234         IOCTL_INFO(VIDIOC_S_OUTPUT, INFO_FL_PRIO),
 235         IOCTL_INFO(VIDIOC_ENUMOUTPUT, 0),
 236         IOCTL_INFO(VIDIOC_G_AUDOUT, 0),
 237         IOCTL_INFO(VIDIOC_S_AUDOUT, INFO_FL_PRIO),
 238         IOCTL_INFO(VIDIOC_G_MODULATOR, 0),
 239         IOCTL_INFO(VIDIOC_S_MODULATOR, INFO_FL_PRIO),
 240         IOCTL_INFO(VIDIOC_G_FREQUENCY, 0),
 241         IOCTL_INFO(VIDIOC_S_FREQUENCY, INFO_FL_PRIO),
 242         IOCTL_INFO(VIDIOC_CROPCAP, 0),
 243         IOCTL_INFO(VIDIOC_G_CROP, 0),
 244         IOCTL_INFO(VIDIOC_S_CROP, INFO_FL_PRIO),
 245         IOCTL_INFO(VIDIOC_G_SELECTION, 0),
 246         IOCTL_INFO(VIDIOC_S_SELECTION, INFO_FL_PRIO),
 247         IOCTL_INFO(VIDIOC_G_JPEGCOMP, 0),
 248         IOCTL_INFO(VIDIOC_S_JPEGCOMP, INFO_FL_PRIO),
 249         IOCTL_INFO(VIDIOC_QUERYSTD, 0),
 250         IOCTL_INFO(VIDIOC_TRY_FMT, 0),
 251         IOCTL_INFO(VIDIOC_ENUMAUDIO, 0),
 252         IOCTL_INFO(VIDIOC_ENUMAUDOUT, 0),
 253         IOCTL_INFO(VIDIOC_G_PRIORITY, 0),
 254         IOCTL_INFO(VIDIOC_S_PRIORITY, INFO_FL_PRIO),
 255         IOCTL_INFO(VIDIOC_G_SLICED_VBI_CAP, 0),
 256         IOCTL_INFO(VIDIOC_LOG_STATUS, 0),
 257         IOCTL_INFO(VIDIOC_G_EXT_CTRLS, INFO_FL_CTRL),
 258         IOCTL_INFO(VIDIOC_S_EXT_CTRLS, INFO_FL_PRIO | INFO_FL_CTRL),
 259         IOCTL_INFO(VIDIOC_TRY_EXT_CTRLS, 0),
 260         IOCTL_INFO(VIDIOC_ENUM_FRAMESIZES, 0),
 261         IOCTL_INFO(VIDIOC_ENUM_FRAMEINTERVALS, 0),
 262         IOCTL_INFO(VIDIOC_G_ENC_INDEX, 0),
 263         IOCTL_INFO(VIDIOC_ENCODER_CMD, INFO_FL_PRIO),
 264         IOCTL_INFO(VIDIOC_TRY_ENCODER_CMD, 0),
 265         IOCTL_INFO(VIDIOC_DECODER_CMD, INFO_FL_PRIO),
 266         IOCTL_INFO(VIDIOC_TRY_DECODER_CMD, 0),
 267 #ifdef CONFIG_VIDEO_ADV_DEBUG
 268         IOCTL_INFO(VIDIOC_DBG_S_REGISTER, 0),
 269         IOCTL_INFO(VIDIOC_DBG_G_REGISTER, 0),
 270 #endif
 271         IOCTL_INFO(VIDIOC_DBG_G_CHIP_IDENT, 0),
 272         IOCTL_INFO(VIDIOC_S_HW_FREQ_SEEK, INFO_FL_PRIO),
 273         IOCTL_INFO(VIDIOC_ENUM_DV_PRESETS, 0),
 274         IOCTL_INFO(VIDIOC_S_DV_PRESET, INFO_FL_PRIO),
 275         IOCTL_INFO(VIDIOC_G_DV_PRESET, 0),
 276         IOCTL_INFO(VIDIOC_QUERY_DV_PRESET, 0),
 277         IOCTL_INFO(VIDIOC_S_DV_TIMINGS, INFO_FL_PRIO),
 278         IOCTL_INFO(VIDIOC_G_DV_TIMINGS, 0),
 279         IOCTL_INFO(VIDIOC_DQEVENT, 0),
 280         IOCTL_INFO(VIDIOC_SUBSCRIBE_EVENT, 0),
 281         IOCTL_INFO(VIDIOC_UNSUBSCRIBE_EVENT, 0),
 282         IOCTL_INFO(VIDIOC_CREATE_BUFS, INFO_FL_PRIO),
 283         IOCTL_INFO(VIDIOC_PREPARE_BUF, 0),
 284         IOCTL_INFO(VIDIOC_ENUM_DV_TIMINGS, 0),
 285         IOCTL_INFO(VIDIOC_QUERY_DV_TIMINGS, 0),
 286         IOCTL_INFO(VIDIOC_DV_TIMINGS_CAP, 0),
 287 };
 288 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
 289
 290 bool v4l2_is_known_ioctl(unsigned int cmd)
 291 {
 292         if (_IOC_NR(cmd) >= V4L2_IOCTLS)
 293                 return false;
 294         return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
 295 }
 296
 297 /* Common ioctl debug function. This function can be used by
 298    external ioctl messages as well as internal V4L ioctl */
 299 void v4l_printk_ioctl(unsigned int cmd)
 300 {
 301         char *dir, *type;
 302
 303         switch (_IOC_TYPE(cmd)) {
 304         case 'd':
 305                 type = "v4l2_int";
 306                 break;
 307         case 'V':
 308                 if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
 309                         type = "v4l2";
 310                         break;
 311                 }
 312                 printk("%s", v4l2_ioctls[_IOC_NR(cmd)].name);
 313                 return;
 314         default:
 315                 type = "unknown";
 316         }
 317
 318         switch (_IOC_DIR(cmd)) {
 319         case _IOC_NONE:              dir = "--"; break;
 320         case _IOC_READ:              dir = "r-"; break;
 321         case _IOC_WRITE:             dir = "-w"; break;
 322         case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
 323         default:                     dir = "*ERR*"; break;
 324         }
 325         printk("%s ioctl '%c', dir=%s, #%d (0x%08x)",
 326                 type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
 327 }
 328 EXPORT_SYMBOL(v4l_printk_ioctl);
 329
 330 static void dbgbuf(unsigned int cmd, struct video_device *vfd,
 331                                         struct v4l2_buffer *p)
 332 {
 333         struct v4l2_timecode *tc = &p->timecode;
 334         struct v4l2_plane *plane;
 335         int i;
 336
 337         dbgarg(cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, "
 338                 "flags=0x%08d, field=%0d, sequence=%d, memory=%s\n",
 339                         p->timestamp.tv_sec / 3600,
 340                         (int)(p->timestamp.tv_sec / 60) % 60,
 341                         (int)(p->timestamp.tv_sec % 60),
 342                         (long)p->timestamp.tv_usec,
 343                         p->index,
 344                         prt_names(p->type, v4l2_type_names),
 345                         p->flags, p->field, p->sequence,
 346                         prt_names(p->memory, v4l2_memory_names));
 347
 348         if (V4L2_TYPE_IS_MULTIPLANAR(p->type) && p->m.planes) {
 349                 for (i = 0; i < p->length; ++i) {
 350                         plane = &p->m.planes[i];
 351                         dbgarg2("plane %d: bytesused=%d, data_offset=0x%08x "
 352                                 "offset/userptr=0x%08lx, length=%d\n",
 353                                 i, plane->bytesused, plane->data_offset,
 354                                 plane->m.userptr, plane->length);
 355                 }
 356         } else {
 357                 dbgarg2("bytesused=%d, offset/userptr=0x%08lx, length=%d\n",
 358                         p->bytesused, p->m.userptr, p->length);
 359         }
 360
 361         dbgarg2("timecode=%02d:%02d:%02d type=%d, "
 362                 "flags=0x%08d, frames=%d, userbits=0x%08x\n",
 363                         tc->hours, tc->minutes, tc->seconds,
 364                         tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
 365 }
 366
 367 static inline void dbgrect(struct video_device *vfd, char *s,
 368                                                         struct v4l2_rect *r)
 369 {
 370         dbgarg2("%sRect start at %dx%d, size=%dx%d\n", s, r->left, r->top,
 371                                                 r->width, r->height);
 372 };
 373
 374 static void dbgtimings(struct video_device *vfd,
 375                         const struct v4l2_dv_timings *p)
 376 {
 377         switch (p->type) {
 378         case V4L2_DV_BT_656_1120:
 379                 dbgarg2("bt-656/1120:interlaced=%d,"
 380                                 " pixelclock=%lld,"
 381                                 " width=%d, height=%d, polarities=%x,"
 382                                 " hfrontporch=%d, hsync=%d,"
 383                                 " hbackporch=%d, vfrontporch=%d,"
 384                                 " vsync=%d, vbackporch=%d,"
 385                                 " il_vfrontporch=%d, il_vsync=%d,"
 386                                 " il_vbackporch=%d, standards=%x, flags=%x\n",
 387                                 p->bt.interlaced, p->bt.pixelclock,
 388                                 p->bt.width, p->bt.height,
 389                                 p->bt.polarities, p->bt.hfrontporch,
 390                                 p->bt.hsync, p->bt.hbackporch,
 391                                 p->bt.vfrontporch, p->bt.vsync,
 392                                 p->bt.vbackporch, p->bt.il_vfrontporch,
 393                                 p->bt.il_vsync, p->bt.il_vbackporch,
 394                                 p->bt.standards, p->bt.flags);
 395                 break;
 396         default:
 397                 dbgarg2("Unknown type %d!\n", p->type);
 398                 break;
 399         }
 400 }
 401
 402 static inline void v4l_print_pix_fmt(struct video_device *vfd,
 403                                                 struct v4l2_pix_format *fmt)
 404 {
 405         dbgarg2("width=%d, height=%d, format=%c%c%c%c, field=%s, "
 406                 "bytesperline=%d sizeimage=%d, colorspace=%d\n",
 407                 fmt->width, fmt->height,
 408                 (fmt->pixelformat & 0xff),
 409                 (fmt->pixelformat >>  8) & 0xff,
 410                 (fmt->pixelformat >> 16) & 0xff,
 411                 (fmt->pixelformat >> 24) & 0xff,
 412                 prt_names(fmt->field, v4l2_field_names),
 413                 fmt->bytesperline, fmt->sizeimage, fmt->colorspace);
 414 };
 415
 416 static inline void v4l_print_pix_fmt_mplane(struct video_device *vfd,
 417                                             struct v4l2_pix_format_mplane *fmt)
 418 {
 419         int i;
 420
 421         dbgarg2("width=%d, height=%d, format=%c%c%c%c, field=%s, "
 422                 "colorspace=%d, num_planes=%d\n",
 423                 fmt->width, fmt->height,
 424                 (fmt->pixelformat & 0xff),
 425                 (fmt->pixelformat >>  8) & 0xff,
 426                 (fmt->pixelformat >> 16) & 0xff,
 427                 (fmt->pixelformat >> 24) & 0xff,
 428                 prt_names(fmt->field, v4l2_field_names),
 429                 fmt->colorspace, fmt->num_planes);
 430
 431         for (i = 0; i < fmt->num_planes; ++i)
 432                 dbgarg2("plane %d: bytesperline=%d sizeimage=%d\n", i,
 433                         fmt->plane_fmt[i].bytesperline,
 434                         fmt->plane_fmt[i].sizeimage);
 435 }
 436
 437 static inline void v4l_print_ext_ctrls(unsigned int cmd,
 438         struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals)
 439 {
 440         __u32 i;
 441
 442         if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG))
 443                 return;
 444         dbgarg(cmd, "");
 445         printk(KERN_CONT "class=0x%x", c->ctrl_class);
 446         for (i = 0; i < c->count; i++) {
 447                 if (show_vals && !c->controls[i].size)
 448                         printk(KERN_CONT " id/val=0x%x/0x%x",
 449                                 c->controls[i].id, c->controls[i].value);
 450                 else
 451                         printk(KERN_CONT " id=0x%x,size=%u",
 452                                 c->controls[i].id, c->controls[i].size);
 453         }
 454         printk(KERN_CONT "\n");
 455 };
 456
 457 static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
 458 {
 459         __u32 i;
 460
 461         /* zero the reserved fields */
 462         c->reserved[0] = c->reserved[1] = 0;
 463         for (i = 0; i < c->count; i++)
 464                 c->controls[i].reserved2[0] = 0;
 465
 466         /* V4L2_CID_PRIVATE_BASE cannot be used as control class
 467            when using extended controls.
 468            Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
 469            is it allowed for backwards compatibility.
 470          */
 471         if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
 472                 return 0;
 473         /* Check that all controls are from the same control class. */
 474         for (i = 0; i < c->count; i++) {
 475                 if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
 476                         c->error_idx = i;
 477                         return 0;
 478                 }
 479         }
 480         return 1;
 481 }
 482
 483 static int check_fmt(const struct v4l2_ioctl_ops *ops, enum v4l2_buf_type type)
 484 {
 485         if (ops == NULL)
 486                 return -EINVAL;
 487
 488         switch (type) {
 489         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 490                 if (ops->vidioc_g_fmt_vid_cap ||
 491                                 ops->vidioc_g_fmt_vid_cap_mplane)
 492                         return 0;
 493                 break;
 494         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 495                 if (ops->vidioc_g_fmt_vid_cap_mplane)
 496                         return 0;
 497                 break;
 498         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 499                 if (ops->vidioc_g_fmt_vid_overlay)
 500                         return 0;
 501                 break;
 502         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 503                 if (ops->vidioc_g_fmt_vid_out ||
 504                                 ops->vidioc_g_fmt_vid_out_mplane)
 505                         return 0;
 506                 break;
 507         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 508                 if (ops->vidioc_g_fmt_vid_out_mplane)
 509                         return 0;
 510                 break;
 511         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 512                 if (ops->vidioc_g_fmt_vid_out_overlay)
 513                         return 0;
 514                 break;
 515         case V4L2_BUF_TYPE_VBI_CAPTURE:
 516                 if (ops->vidioc_g_fmt_vbi_cap)
 517                         return 0;
 518                 break;
 519         case V4L2_BUF_TYPE_VBI_OUTPUT:
 520                 if (ops->vidioc_g_fmt_vbi_out)
 521                         return 0;
 522                 break;
 523         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 524                 if (ops->vidioc_g_fmt_sliced_vbi_cap)
 525                         return 0;
 526                 break;
 527         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 528                 if (ops->vidioc_g_fmt_sliced_vbi_out)
 529                         return 0;
 530                 break;
 531         case V4L2_BUF_TYPE_PRIVATE:
 532                 if (ops->vidioc_g_fmt_type_private)
 533                         return 0;
 534                 break;
 535         }
 536         return -EINVAL;
 537 }
 538
 539 static long __video_do_ioctl(struct file *file,
 540                 unsigned int cmd, void *arg)
 541 {
 542         struct video_device *vfd = video_devdata(file);
 543         const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
 544         void *fh = file->private_data;
 545         struct v4l2_fh *vfh = NULL;
 546         int use_fh_prio = 0;
 547         long ret = -ENOTTY;
 548
 549         if (ops == NULL) {
 550                 printk(KERN_WARNING "videodev: \"%s\" has no ioctl_ops.\n",
 551                                 vfd->name);
 552                 return ret;
 553         }
 554
 555         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
 556                 vfh = file->private_data;
 557                 use_fh_prio = test_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
 558         }
 559
 560         if (v4l2_is_known_ioctl(cmd)) {
 561                 struct v4l2_ioctl_info *info = &v4l2_ioctls[_IOC_NR(cmd)];
 562
 563                 if (!test_bit(_IOC_NR(cmd), vfd->valid_ioctls) &&
 564                     !((info->flags & INFO_FL_CTRL) && vfh && vfh->ctrl_handler))
 565                         return -ENOTTY;
 566
 567                 if (use_fh_prio && (info->flags & INFO_FL_PRIO)) {
 568                         ret = v4l2_prio_check(vfd->prio, vfh->prio);
 569                         if (ret)
 570                                 return ret;
 571                 }
 572         }
 573
 574         if ((vfd->debug & V4L2_DEBUG_IOCTL) &&
 575                                 !(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) {
 576                 v4l_print_ioctl(vfd->name, cmd);
 577                 printk(KERN_CONT "\n");
 578         }
 579
 580         switch (cmd) {
 581
 582         /* --- capabilities ------------------------------------------ */
 583         case VIDIOC_QUERYCAP:
 584         {
 585                 struct v4l2_capability *cap = (struct v4l2_capability *)arg;
 586
 587                 cap->version = LINUX_VERSION_CODE;
 588                 ret = ops->vidioc_querycap(file, fh, cap);
 589                 if (!ret)
 590                         dbgarg(cmd, "driver=%s, card=%s, bus=%s, "
 591                                         "version=0x%08x, "
 592                                         "capabilities=0x%08x, "
 593                                         "device_caps=0x%08x\n",
 594                                         cap->driver, cap->card, cap->bus_info,
 595                                         cap->version,
 596                                         cap->capabilities,
 597                                         cap->device_caps);
 598                 break;
 599         }
 600
 601         /* --- priority ------------------------------------------ */
 602         case VIDIOC_G_PRIORITY:
 603         {
 604                 enum v4l2_priority *p = arg;
 605
 606                 if (ops->vidioc_g_priority) {
 607                         ret = ops->vidioc_g_priority(file, fh, p);
 608                 } else if (use_fh_prio) {
 609                         *p = v4l2_prio_max(&vfd->v4l2_dev->prio);
 610                         ret = 0;
 611                 }
 612                 if (!ret)
 613                         dbgarg(cmd, "priority is %d\n", *p);
 614                 break;
 615         }
 616         case VIDIOC_S_PRIORITY:
 617         {
 618                 enum v4l2_priority *p = arg;
 619
 620                 dbgarg(cmd, "setting priority to %d\n", *p);
 621                 if (ops->vidioc_s_priority)
 622                         ret = ops->vidioc_s_priority(file, fh, *p);
 623                 else
 624                         ret = v4l2_prio_change(&vfd->v4l2_dev->prio,
 625                                                         &vfh->prio, *p);
 626                 break;
 627         }
 628
 629         /* --- capture ioctls ---------------------------------------- */
 630         case VIDIOC_ENUM_FMT:
 631         {
 632                 struct v4l2_fmtdesc *f = arg;
 633
 634                 ret = -EINVAL;
 635                 switch (f->type) {
 636                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 637                         if (likely(ops->vidioc_enum_fmt_vid_cap))
 638                                 ret = ops->vidioc_enum_fmt_vid_cap(file, fh, f);
 639                         break;
 640                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 641                         if (likely(ops->vidioc_enum_fmt_vid_cap_mplane))
 642                                 ret = ops->vidioc_enum_fmt_vid_cap_mplane(file,
 643                                                                         fh, f);
 644                         break;
 645                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 646                         if (likely(ops->vidioc_enum_fmt_vid_overlay))
 647                                 ret = ops->vidioc_enum_fmt_vid_overlay(file,
 648                                         fh, f);
 649                         break;
 650                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 651                         if (likely(ops->vidioc_enum_fmt_vid_out))
 652                                 ret = ops->vidioc_enum_fmt_vid_out(file, fh, f);
 653                         break;
 654                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 655                         if (likely(ops->vidioc_enum_fmt_vid_out_mplane))
 656                                 ret = ops->vidioc_enum_fmt_vid_out_mplane(file,
 657                                                                         fh, f);
 658                         break;
 659                 case V4L2_BUF_TYPE_PRIVATE:
 660                         if (likely(ops->vidioc_enum_fmt_type_private))
 661                                 ret = ops->vidioc_enum_fmt_type_private(file,
 662                                                                 fh, f);
 663                         break;
 664                 default:
 665                         break;
 666                 }
 667                 if (likely(!ret))
 668                         dbgarg(cmd, "index=%d, type=%d, flags=%d, "
 669                                 "pixelformat=%c%c%c%c, description='%s'\n",
 670                                 f->index, f->type, f->flags,
 671                                 (f->pixelformat & 0xff),
 672                                 (f->pixelformat >>  8) & 0xff,
 673                                 (f->pixelformat >> 16) & 0xff,
 674                                 (f->pixelformat >> 24) & 0xff,
 675                                 f->description);
 676                 break;
 677         }
 678         case VIDIOC_G_FMT:
 679         {
 680                 struct v4l2_format *f = (struct v4l2_format *)arg;
 681
 682                 /* FIXME: Should be one dump per type */
 683                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
 684
 685                 ret = -EINVAL;
 686                 switch (f->type) {
 687                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 688                         if (ops->vidioc_g_fmt_vid_cap)
 689                                 ret = ops->vidioc_g_fmt_vid_cap(file, fh, f);
 690                         if (!ret)
 691                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 692                         break;
 693                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 694                         if (ops->vidioc_g_fmt_vid_cap_mplane)
 695                                 ret = ops->vidioc_g_fmt_vid_cap_mplane(file,
 696                                                                         fh, f);
 697                         if (!ret)
 698                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
 699                         break;
 700                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 701                         if (likely(ops->vidioc_g_fmt_vid_overlay))
 702                                 ret = ops->vidioc_g_fmt_vid_overlay(file,
 703                                                                     fh, f);
 704                         break;
 705                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 706                         if (ops->vidioc_g_fmt_vid_out)
 707                                 ret = ops->vidioc_g_fmt_vid_out(file, fh, f);
 708                         if (!ret)
 709                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 710                         break;
 711                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 712                         if (ops->vidioc_g_fmt_vid_out_mplane)
 713                                 ret = ops->vidioc_g_fmt_vid_out_mplane(file,
 714                                                                         fh, f);
 715                         if (!ret)
 716                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
 717                         break;
 718                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 719                         if (likely(ops->vidioc_g_fmt_vid_out_overlay))
 720                                 ret = ops->vidioc_g_fmt_vid_out_overlay(file,
 721                                        fh, f);
 722                         break;
 723                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 724                         if (likely(ops->vidioc_g_fmt_vbi_cap))
 725                                 ret = ops->vidioc_g_fmt_vbi_cap(file, fh, f);
 726                         break;
 727                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 728                         if (likely(ops->vidioc_g_fmt_vbi_out))
 729                                 ret = ops->vidioc_g_fmt_vbi_out(file, fh, f);
 730                         break;
 731                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 732                         if (likely(ops->vidioc_g_fmt_sliced_vbi_cap))
 733                                 ret = ops->vidioc_g_fmt_sliced_vbi_cap(file,
 734                                                                         fh, f);
 735                         break;
 736                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 737                         if (likely(ops->vidioc_g_fmt_sliced_vbi_out))
 738                                 ret = ops->vidioc_g_fmt_sliced_vbi_out(file,
 739                                                                         fh, f);
 740                         break;
 741                 case V4L2_BUF_TYPE_PRIVATE:
 742                         if (likely(ops->vidioc_g_fmt_type_private))
 743                                 ret = ops->vidioc_g_fmt_type_private(file,
 744                                                                 fh, f);
 745                         break;
 746                 }
 747                 break;
 748         }
 749         case VIDIOC_S_FMT:
 750         {
 751                 struct v4l2_format *f = (struct v4l2_format *)arg;
 752
 753                 ret = -EINVAL;
 754
 755                 /* FIXME: Should be one dump per type */
 756                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
 757
 758                 switch (f->type) {
 759                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 760                         CLEAR_AFTER_FIELD(f, fmt.pix);
 761                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
 762                         if (ops->vidioc_s_fmt_vid_cap)
 763                                 ret = ops->vidioc_s_fmt_vid_cap(file, fh, f);
 764                         break;
 765                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 766                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
 767                         v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
 768                         if (ops->vidioc_s_fmt_vid_cap_mplane)
 769                                 ret = ops->vidioc_s_fmt_vid_cap_mplane(file,
 770                                                                         fh, f);
 771                         break;
 772                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 773                         CLEAR_AFTER_FIELD(f, fmt.win);
 774                         if (ops->vidioc_s_fmt_vid_overlay)
 775                                 ret = ops->vidioc_s_fmt_vid_overlay(file,
 776                                                                     fh, f);
 777                         break;
 778                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 779                         CLEAR_AFTER_FIELD(f, fmt.pix);
 780                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
 781                         if (ops->vidioc_s_fmt_vid_out)
 782                                 ret = ops->vidioc_s_fmt_vid_out(file, fh, f);
 783                         break;
 784                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 785                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
 786                         v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
 787                         if (ops->vidioc_s_fmt_vid_out_mplane)
 788                                 ret = ops->vidioc_s_fmt_vid_out_mplane(file,
 789                                                                         fh, f);
 790                         break;
 791                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 792                         CLEAR_AFTER_FIELD(f, fmt.win);
 793                         if (ops->vidioc_s_fmt_vid_out_overlay)
 794                                 ret = ops->vidioc_s_fmt_vid_out_overlay(file,
 795                                         fh, f);
 796                         break;
 797                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 798                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 799                         if (likely(ops->vidioc_s_fmt_vbi_cap))
 800                                 ret = ops->vidioc_s_fmt_vbi_cap(file, fh, f);
 801                         break;
 802                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 803                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 804                         if (likely(ops->vidioc_s_fmt_vbi_out))
 805                                 ret = ops->vidioc_s_fmt_vbi_out(file, fh, f);
 806                         break;
 807                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 808                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 809                         if (likely(ops->vidioc_s_fmt_sliced_vbi_cap))
 810                                 ret = ops->vidioc_s_fmt_sliced_vbi_cap(file,
 811                                                                         fh, f);
 812                         break;
 813                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 814                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 815                         if (likely(ops->vidioc_s_fmt_sliced_vbi_out))
 816                                 ret = ops->vidioc_s_fmt_sliced_vbi_out(file,
 817                                                                         fh, f);
 818
 819                         break;
 820                 case V4L2_BUF_TYPE_PRIVATE:
 821                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
 822                         if (likely(ops->vidioc_s_fmt_type_private))
 823                                 ret = ops->vidioc_s_fmt_type_private(file,
 824                                                                 fh, f);
 825                         break;
 826                 }
 827                 break;
 828         }
 829         case VIDIOC_TRY_FMT:
 830         {
 831                 struct v4l2_format *f = (struct v4l2_format *)arg;
 832
 833                 /* FIXME: Should be one dump per type */
 834                 dbgarg(cmd, "type=%s\n", prt_names(f->type,
 835                                                 v4l2_type_names));
 836                 ret = -EINVAL;
 837                 switch (f->type) {
 838                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 839                         CLEAR_AFTER_FIELD(f, fmt.pix);
 840                         if (ops->vidioc_try_fmt_vid_cap)
 841                                 ret = ops->vidioc_try_fmt_vid_cap(file, fh, f);
 842                         if (!ret)
 843                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 844                         break;
 845                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 846                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
 847                         if (ops->vidioc_try_fmt_vid_cap_mplane)
 848                                 ret = ops->vidioc_try_fmt_vid_cap_mplane(file,
 849                                                                          fh, f);
 850                         if (!ret)
 851                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
 852                         break;
 853                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 854                         CLEAR_AFTER_FIELD(f, fmt.win);
 855                         if (likely(ops->vidioc_try_fmt_vid_overlay))
 856                                 ret = ops->vidioc_try_fmt_vid_overlay(file,
 857                                         fh, f);
 858                         break;
 859                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 860                         CLEAR_AFTER_FIELD(f, fmt.pix);
 861                         if (ops->vidioc_try_fmt_vid_out)
 862                                 ret = ops->vidioc_try_fmt_vid_out(file, fh, f);
 863                         if (!ret)
 864                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
 865                         break;
 866                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 867                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
 868                         if (ops->vidioc_try_fmt_vid_out_mplane)
 869                                 ret = ops->vidioc_try_fmt_vid_out_mplane(file,
 870                                                                          fh, f);
 871                         if (!ret)
 872                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
 873                         break;
 874                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 875                         CLEAR_AFTER_FIELD(f, fmt.win);
 876                         if (likely(ops->vidioc_try_fmt_vid_out_overlay))
 877                                 ret = ops->vidioc_try_fmt_vid_out_overlay(file,
 878                                        fh, f);
 879                         break;
 880                 case V4L2_BUF_TYPE_VBI_CAPTURE:
 881                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 882                         if (likely(ops->vidioc_try_fmt_vbi_cap))
 883                                 ret = ops->vidioc_try_fmt_vbi_cap(file, fh, f);
 884                         break;
 885                 case V4L2_BUF_TYPE_VBI_OUTPUT:
 886                         CLEAR_AFTER_FIELD(f, fmt.vbi);
 887                         if (likely(ops->vidioc_try_fmt_vbi_out))
 888                                 ret = ops->vidioc_try_fmt_vbi_out(file, fh, f);
 889                         break;
 890                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 891                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 892                         if (likely(ops->vidioc_try_fmt_sliced_vbi_cap))
 893                                 ret = ops->vidioc_try_fmt_sliced_vbi_cap(file,
 894                                                                 fh, f);
 895                         break;
 896                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 897                         CLEAR_AFTER_FIELD(f, fmt.sliced);
 898                         if (likely(ops->vidioc_try_fmt_sliced_vbi_out))
 899                                 ret = ops->vidioc_try_fmt_sliced_vbi_out(file,
 900                                                                 fh, f);
 901                         break;
 902                 case V4L2_BUF_TYPE_PRIVATE:
 903                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
 904                         if (likely(ops->vidioc_try_fmt_type_private))
 905                                 ret = ops->vidioc_try_fmt_type_private(file,
 906                                                                 fh, f);
 907                         break;
 908                 }
 909                 break;
 910         }
 911         /* FIXME: Those buf reqs could be handled here,
 912            with some changes on videobuf to allow its header to be included at
 913            videodev2.h or being merged at videodev2.
 914          */
 915         case VIDIOC_REQBUFS:
 916         {
 917                 struct v4l2_requestbuffers *p = arg;
 918
 919                 ret = check_fmt(ops, p->type);
 920                 if (ret)
 921                         break;
 922
 923                 if (p->type < V4L2_BUF_TYPE_PRIVATE)
 924                         CLEAR_AFTER_FIELD(p, memory);
 925
 926                 ret = ops->vidioc_reqbufs(file, fh, p);
 927                 dbgarg(cmd, "count=%d, type=%s, memory=%s\n",
 928                                 p->count,
 929                                 prt_names(p->type, v4l2_type_names),
 930                                 prt_names(p->memory, v4l2_memory_names));
 931                 break;
 932         }
 933         case VIDIOC_QUERYBUF:
 934         {
 935                 struct v4l2_buffer *p = arg;
 936
 937                 ret = check_fmt(ops, p->type);
 938                 if (ret)
 939                         break;
 940
 941                 ret = ops->vidioc_querybuf(file, fh, p);
 942                 if (!ret)
 943                         dbgbuf(cmd, vfd, p);
 944                 break;
 945         }
 946         case VIDIOC_QBUF:
 947         {
 948                 struct v4l2_buffer *p = arg;
 949
 950                 ret = check_fmt(ops, p->type);
 951                 if (ret)
 952                         break;
 953
 954                 ret = ops->vidioc_qbuf(file, fh, p);
 955                 if (!ret)
 956                         dbgbuf(cmd, vfd, p);
 957                 break;
 958         }
 959         case VIDIOC_DQBUF:
 960         {
 961                 struct v4l2_buffer *p = arg;
 962
 963                 ret = check_fmt(ops, p->type);
 964                 if (ret)
 965                         break;
 966
 967                 ret = ops->vidioc_dqbuf(file, fh, p);
 968                 if (!ret)
 969                         dbgbuf(cmd, vfd, p);
 970                 break;
 971         }
 972         case VIDIOC_OVERLAY:
 973         {
 974                 int *i = arg;
 975
 976                 dbgarg(cmd, "value=%d\n", *i);
 977                 ret = ops->vidioc_overlay(file, fh, *i);
 978                 break;
 979         }
 980         case VIDIOC_G_FBUF:
 981         {
 982                 struct v4l2_framebuffer *p = arg;
 983
 984                 ret = ops->vidioc_g_fbuf(file, fh, arg);
 985                 if (!ret) {
 986                         dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
 987                                         p->capability, p->flags,
 988                                         (unsigned long)p->base);
 989                         v4l_print_pix_fmt(vfd, &p->fmt);
 990                 }
 991                 break;
 992         }
 993         case VIDIOC_S_FBUF:
 994         {
 995                 struct v4l2_framebuffer *p = arg;
 996
 997                 dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
 998                         p->capability, p->flags, (unsigned long)p->base);
 999                 v4l_print_pix_fmt(vfd, &p->fmt);
1000                 ret = ops->vidioc_s_fbuf(file, fh, arg);
1001                 break;
1002         }
1003         case VIDIOC_STREAMON:
1004         {
1005                 enum v4l2_buf_type i = *(int *)arg;
1006
1007                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1008                 ret = ops->vidioc_streamon(file, fh, i);
1009                 break;
1010         }
1011         case VIDIOC_STREAMOFF:
1012         {
1013                 enum v4l2_buf_type i = *(int *)arg;
1014
1015                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1016                 ret = ops->vidioc_streamoff(file, fh, i);
1017                 break;
1018         }
1019         /* ---------- tv norms ---------- */
1020         case VIDIOC_ENUMSTD:
1021         {
1022                 struct v4l2_standard *p = arg;
1023                 v4l2_std_id id = vfd->tvnorms, curr_id = 0;
1024                 unsigned int index = p->index, i, j = 0;
1025                 const char *descr = "";
1026
1027                 if (id == 0)
1028                         break;
1029                 ret = -EINVAL;
1030
1031                 /* Return norm array in a canonical way */
1032                 for (i = 0; i <= index && id; i++) {
1033                         /* last std value in the standards array is 0, so this
1034                            while always ends there since (id & 0) == 0. */
1035                         while ((id & standards[j].std) != standards[j].std)
1036                                 j++;
1037                         curr_id = standards[j].std;
1038                         descr = standards[j].descr;
1039                         j++;
1040                         if (curr_id == 0)
1041                                 break;
1042                         if (curr_id != V4L2_STD_PAL &&
1043                             curr_id != V4L2_STD_SECAM &&
1044                             curr_id != V4L2_STD_NTSC)
1045                                 id &= ~curr_id;
1046                 }
1047                 if (i <= index)
1048                         break;
1049
1050                 v4l2_video_std_construct(p, curr_id, descr);
1051
1052                 dbgarg(cmd, "index=%d, id=0x%Lx, name=%s, fps=%d/%d, "
1053                                 "framelines=%d\n", p->index,
1054                                 (unsigned long long)p->id, p->name,
1055                                 p->frameperiod.numerator,
1056                                 p->frameperiod.denominator,
1057                                 p->framelines);
1058
1059                 ret = 0;
1060                 break;
1061         }
1062         case VIDIOC_G_STD:
1063         {
1064                 v4l2_std_id *id = arg;
1065
1066                 /* Calls the specific handler */
1067                 if (ops->vidioc_g_std)
1068                         ret = ops->vidioc_g_std(file, fh, id);
1069                 else if (vfd->current_norm) {
1070                         ret = 0;
1071                         *id = vfd->current_norm;
1072                 }
1073
1074                 if (likely(!ret))
1075                         dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
1076                 break;
1077         }
1078         case VIDIOC_S_STD:
1079         {
1080                 v4l2_std_id *id = arg, norm;
1081
1082                 dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id);
1083
1084                 ret = -EINVAL;
1085                 norm = (*id) & vfd->tvnorms;
1086                 if (vfd->tvnorms && !norm)      /* Check if std is supported */
1087                         break;
1088
1089                 /* Calls the specific handler */
1090                 ret = ops->vidioc_s_std(file, fh, &norm);
1091
1092                 /* Updates standard information */
1093                 if (ret >= 0)
1094                         vfd->current_norm = norm;
1095                 break;
1096         }
1097         case VIDIOC_QUERYSTD:
1098         {
1099                 v4l2_std_id *p = arg;
1100
1101                 /*
1102                  * If nothing detected, it should return all supported
1103                  * Drivers just need to mask the std argument, in order
1104                  * to remove the standards that don't apply from the mask.
1105                  * This means that tuners, audio and video decoders can join
1106                  * their efforts to improve the standards detection
1107                  */
1108                 *p = vfd->tvnorms;
1109                 ret = ops->vidioc_querystd(file, fh, arg);
1110                 if (!ret)
1111                         dbgarg(cmd, "detected std=%08Lx\n",
1112                                                 (unsigned long long)*p);
1113                 break;
1114         }
1115         /* ------ input switching ---------- */
1116         /* FIXME: Inputs can be handled inside videodev2 */
1117         case VIDIOC_ENUMINPUT:
1118         {
1119                 struct v4l2_input *p = arg;
1120
1121                 /*
1122                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1123                  * CAP_STD here based on ioctl handler provided by the
1124                  * driver. If the driver doesn't support these
1125                  * for a specific input, it must override these flags.
1126                  */
1127                 if (ops->vidioc_s_std)
1128                         p->capabilities |= V4L2_IN_CAP_STD;
1129                 if (ops->vidioc_s_dv_preset)
1130                         p->capabilities |= V4L2_IN_CAP_PRESETS;
1131                 if (ops->vidioc_s_dv_timings)
1132                         p->capabilities |= V4L2_IN_CAP_CUSTOM_TIMINGS;
1133
1134                 ret = ops->vidioc_enum_input(file, fh, p);
1135                 if (!ret)
1136                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1137                                 "audioset=%d, "
1138                                 "tuner=%d, std=%08Lx, status=%d\n",
1139                                 p->index, p->name, p->type, p->audioset,
1140                                 p->tuner,
1141                                 (unsigned long long)p->std,
1142                                 p->status);
1143                 break;
1144         }
1145         case VIDIOC_G_INPUT:
1146         {
1147                 unsigned int *i = arg;
1148
1149                 ret = ops->vidioc_g_input(file, fh, i);
1150                 if (!ret)
1151                         dbgarg(cmd, "value=%d\n", *i);
1152                 break;
1153         }
1154         case VIDIOC_S_INPUT:
1155         {
1156                 unsigned int *i = arg;
1157
1158                 dbgarg(cmd, "value=%d\n", *i);
1159                 ret = ops->vidioc_s_input(file, fh, *i);
1160                 break;
1161         }
1162
1163         /* ------ output switching ---------- */
1164         case VIDIOC_ENUMOUTPUT:
1165         {
1166                 struct v4l2_output *p = arg;
1167
1168                 /*
1169                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1170                  * CAP_STD here based on ioctl handler provided by the
1171                  * driver. If the driver doesn't support these
1172                  * for a specific output, it must override these flags.
1173                  */
1174                 if (ops->vidioc_s_std)
1175                         p->capabilities |= V4L2_OUT_CAP_STD;
1176                 if (ops->vidioc_s_dv_preset)
1177                         p->capabilities |= V4L2_OUT_CAP_PRESETS;
1178                 if (ops->vidioc_s_dv_timings)
1179                         p->capabilities |= V4L2_OUT_CAP_CUSTOM_TIMINGS;
1180
1181                 ret = ops->vidioc_enum_output(file, fh, p);
1182                 if (!ret)
1183                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1184                                 "audioset=0x%x, "
1185                                 "modulator=%d, std=0x%08Lx\n",
1186                                 p->index, p->name, p->type, p->audioset,
1187                                 p->modulator, (unsigned long long)p->std);
1188                 break;
1189         }
1190         case VIDIOC_G_OUTPUT:
1191         {
1192                 unsigned int *i = arg;
1193
1194                 ret = ops->vidioc_g_output(file, fh, i);
1195                 if (!ret)
1196                         dbgarg(cmd, "value=%d\n", *i);
1197                 break;
1198         }
1199         case VIDIOC_S_OUTPUT:
1200         {
1201                 unsigned int *i = arg;
1202
1203                 dbgarg(cmd, "value=%d\n", *i);
1204                 ret = ops->vidioc_s_output(file, fh, *i);
1205                 break;
1206         }
1207
1208         /* --- controls ---------------------------------------------- */
1209         case VIDIOC_QUERYCTRL:
1210         {
1211                 struct v4l2_queryctrl *p = arg;
1212
1213                 if (vfh && vfh->ctrl_handler)
1214                         ret = v4l2_queryctrl(vfh->ctrl_handler, p);
1215                 else if (vfd->ctrl_handler)
1216                         ret = v4l2_queryctrl(vfd->ctrl_handler, p);
1217                 else if (ops->vidioc_queryctrl)
1218                         ret = ops->vidioc_queryctrl(file, fh, p);
1219                 else
1220                         break;
1221                 if (!ret)
1222                         dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, "
1223                                         "step=%d, default=%d, flags=0x%08x\n",
1224                                         p->id, p->type, p->name,
1225                                         p->minimum, p->maximum,
1226                                         p->step, p->default_value, p->flags);
1227                 else
1228                         dbgarg(cmd, "id=0x%x\n", p->id);
1229                 break;
1230         }
1231         case VIDIOC_G_CTRL:
1232         {
1233                 struct v4l2_control *p = arg;
1234
1235                 if (vfh && vfh->ctrl_handler)
1236                         ret = v4l2_g_ctrl(vfh->ctrl_handler, p);
1237                 else if (vfd->ctrl_handler)
1238                         ret = v4l2_g_ctrl(vfd->ctrl_handler, p);
1239                 else if (ops->vidioc_g_ctrl)
1240                         ret = ops->vidioc_g_ctrl(file, fh, p);
1241                 else if (ops->vidioc_g_ext_ctrls) {
1242                         struct v4l2_ext_controls ctrls;
1243                         struct v4l2_ext_control ctrl;
1244
1245                         ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1246                         ctrls.count = 1;
1247                         ctrls.controls = &ctrl;
1248                         ctrl.id = p->id;
1249                         ctrl.value = p->value;
1250                         if (check_ext_ctrls(&ctrls, 1)) {
1251                                 ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
1252                                 if (ret == 0)
1253                                         p->value = ctrl.value;
1254                         }
1255                 } else
1256                         break;
1257                 if (!ret)
1258                         dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1259                 else
1260                         dbgarg(cmd, "id=0x%x\n", p->id);
1261                 break;
1262         }
1263         case VIDIOC_S_CTRL:
1264         {
1265                 struct v4l2_control *p = arg;
1266                 struct v4l2_ext_controls ctrls;
1267                 struct v4l2_ext_control ctrl;
1268
1269                 if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
1270                         !ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
1271                         break;
1272
1273                 dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1274
1275                 if (vfh && vfh->ctrl_handler) {
1276                         ret = v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
1277                         break;
1278                 }
1279                 if (vfd->ctrl_handler) {
1280                         ret = v4l2_s_ctrl(NULL, vfd->ctrl_handler, p);
1281                         break;
1282                 }
1283                 if (ops->vidioc_s_ctrl) {
1284                         ret = ops->vidioc_s_ctrl(file, fh, p);
1285                         break;
1286                 }
1287                 if (!ops->vidioc_s_ext_ctrls)
1288                         break;
1289
1290                 ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1291                 ctrls.count = 1;
1292                 ctrls.controls = &ctrl;
1293                 ctrl.id = p->id;
1294                 ctrl.value = p->value;
1295                 if (check_ext_ctrls(&ctrls, 1))
1296                         ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
1297                 else
1298                         ret = -EINVAL;
1299                 break;
1300         }
1301         case VIDIOC_G_EXT_CTRLS:
1302         {
1303                 struct v4l2_ext_controls *p = arg;
1304
1305                 p->error_idx = p->count;
1306                 if (vfh && vfh->ctrl_handler)
1307                         ret = v4l2_g_ext_ctrls(vfh->ctrl_handler, p);
1308                 else if (vfd->ctrl_handler)
1309                         ret = v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
1310                 else if (ops->vidioc_g_ext_ctrls)
1311                         ret = check_ext_ctrls(p, 0) ?
1312                                 ops->vidioc_g_ext_ctrls(file, fh, p) :
1313                                 -EINVAL;
1314                 else
1315                         break;
1316                 v4l_print_ext_ctrls(cmd, vfd, p, !ret);
1317                 break;
1318         }
1319         case VIDIOC_S_EXT_CTRLS:
1320         {
1321                 struct v4l2_ext_controls *p = arg;
1322
1323                 p->error_idx = p->count;
1324                 if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
1325                                 !ops->vidioc_s_ext_ctrls)
1326                         break;
1327                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1328                 if (vfh && vfh->ctrl_handler)
1329                         ret = v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, p);
1330                 else if (vfd->ctrl_handler)
1331                         ret = v4l2_s_ext_ctrls(NULL, vfd->ctrl_handler, p);
1332                 else if (check_ext_ctrls(p, 0))
1333                         ret = ops->vidioc_s_ext_ctrls(file, fh, p);
1334                 else
1335                         ret = -EINVAL;
1336                 break;
1337         }
1338         case VIDIOC_TRY_EXT_CTRLS:
1339         {
1340                 struct v4l2_ext_controls *p = arg;
1341
1342                 p->error_idx = p->count;
1343                 if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
1344                                 !ops->vidioc_try_ext_ctrls)
1345                         break;
1346                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1347                 if (vfh && vfh->ctrl_handler)
1348                         ret = v4l2_try_ext_ctrls(vfh->ctrl_handler, p);
1349                 else if (vfd->ctrl_handler)
1350                         ret = v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
1351                 else if (check_ext_ctrls(p, 0))
1352                         ret = ops->vidioc_try_ext_ctrls(file, fh, p);
1353                 else
1354                         ret = -EINVAL;
1355                 break;
1356         }
1357         case VIDIOC_QUERYMENU:
1358         {
1359                 struct v4l2_querymenu *p = arg;
1360
1361                 if (vfh && vfh->ctrl_handler)
1362                         ret = v4l2_querymenu(vfh->ctrl_handler, p);
1363                 else if (vfd->ctrl_handler)
1364                         ret = v4l2_querymenu(vfd->ctrl_handler, p);
1365                 else if (ops->vidioc_querymenu)
1366                         ret = ops->vidioc_querymenu(file, fh, p);
1367                 else
1368                         break;
1369                 if (!ret)
1370                         dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
1371                                 p->id, p->index, p->name);
1372                 else
1373                         dbgarg(cmd, "id=0x%x, index=%d\n",
1374                                 p->id, p->index);
1375                 break;
1376         }
1377         /* --- audio ---------------------------------------------- */
1378         case VIDIOC_ENUMAUDIO:
1379         {
1380                 struct v4l2_audio *p = arg;
1381
1382                 ret = ops->vidioc_enumaudio(file, fh, p);
1383                 if (!ret)
1384                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1385                                         "mode=0x%x\n", p->index, p->name,
1386                                         p->capability, p->mode);
1387                 else
1388                         dbgarg(cmd, "index=%d\n", p->index);
1389                 break;
1390         }
1391         case VIDIOC_G_AUDIO:
1392         {
1393                 struct v4l2_audio *p = arg;
1394
1395                 ret = ops->vidioc_g_audio(file, fh, p);
1396                 if (!ret)
1397                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1398                                         "mode=0x%x\n", p->index,
1399                                         p->name, p->capability, p->mode);
1400                 else
1401                         dbgarg(cmd, "index=%d\n", p->index);
1402                 break;
1403         }
1404         case VIDIOC_S_AUDIO:
1405         {
1406                 struct v4l2_audio *p = arg;
1407
1408                 dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1409                                         "mode=0x%x\n", p->index, p->name,
1410                                         p->capability, p->mode);
1411                 ret = ops->vidioc_s_audio(file, fh, p);
1412                 break;
1413         }
1414         case VIDIOC_ENUMAUDOUT:
1415         {
1416                 struct v4l2_audioout *p = arg;
1417
1418                 dbgarg(cmd, "Enum for index=%d\n", p->index);
1419                 ret = ops->vidioc_enumaudout(file, fh, p);
1420                 if (!ret)
1421                         dbgarg2("index=%d, name=%s, capability=%d, "
1422                                         "mode=%d\n", p->index, p->name,
1423                                         p->capability, p->mode);
1424                 break;
1425         }
1426         case VIDIOC_G_AUDOUT:
1427         {
1428                 struct v4l2_audioout *p = arg;
1429
1430                 ret = ops->vidioc_g_audout(file, fh, p);
1431                 if (!ret)
1432                         dbgarg2("index=%d, name=%s, capability=%d, "
1433                                         "mode=%d\n", p->index, p->name,
1434                                         p->capability, p->mode);
1435                 break;
1436         }
1437         case VIDIOC_S_AUDOUT:
1438         {
1439                 struct v4l2_audioout *p = arg;
1440
1441                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1442                                         "mode=%d\n", p->index, p->name,
1443                                         p->capability, p->mode);
1444
1445                 ret = ops->vidioc_s_audout(file, fh, p);
1446                 break;
1447         }
1448         case VIDIOC_G_MODULATOR:
1449         {
1450                 struct v4l2_modulator *p = arg;
1451
1452                 ret = ops->vidioc_g_modulator(file, fh, p);
1453                 if (!ret)
1454                         dbgarg(cmd, "index=%d, name=%s, "
1455                                         "capability=%d, rangelow=%d,"
1456                                         " rangehigh=%d, txsubchans=%d\n",
1457                                         p->index, p->name, p->capability,
1458                                         p->rangelow, p->rangehigh,
1459                                         p->txsubchans);
1460                 break;
1461         }
1462         case VIDIOC_S_MODULATOR:
1463         {
1464                 struct v4l2_modulator *p = arg;
1465
1466                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1467                                 "rangelow=%d, rangehigh=%d, txsubchans=%d\n",
1468                                 p->index, p->name, p->capability, p->rangelow,
1469                                 p->rangehigh, p->txsubchans);
1470                         ret = ops->vidioc_s_modulator(file, fh, p);
1471                 break;
1472         }
1473         case VIDIOC_G_CROP:
1474         {
1475                 struct v4l2_crop *p = arg;
1476
1477                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1478
1479                 if (ops->vidioc_g_crop) {
1480                         ret = ops->vidioc_g_crop(file, fh, p);
1481                 } else {
1482                         /* simulate capture crop using selection api */
1483                         struct v4l2_selection s = {
1484                                 .type = p->type,
1485                         };
1486
1487                         /* crop means compose for output devices */
1488                         if (V4L2_TYPE_IS_OUTPUT(p->type))
1489                                 s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
1490                         else
1491                                 s.target = V4L2_SEL_TGT_CROP_ACTIVE;
1492
1493                         ret = ops->vidioc_g_selection(file, fh, &s);
1494
1495                         /* copying results to old structure on success */
1496                         if (!ret)
1497                                 p->c = s.r;
1498                 }
1499
1500                 if (!ret)
1501                         dbgrect(vfd, "", &p->c);
1502                 break;
1503         }
1504         case VIDIOC_S_CROP:
1505         {
1506                 struct v4l2_crop *p = arg;
1507
1508                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1509                 dbgrect(vfd, "", &p->c);
1510
1511                 if (ops->vidioc_s_crop) {
1512                         ret = ops->vidioc_s_crop(file, fh, p);
1513                 } else {
1514                         /* simulate capture crop using selection api */
1515                         struct v4l2_selection s = {
1516                                 .type = p->type,
1517                                 .r = p->c,
1518                         };
1519
1520                         /* crop means compose for output devices */
1521                         if (V4L2_TYPE_IS_OUTPUT(p->type))
1522                                 s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
1523                         else
1524                                 s.target = V4L2_SEL_TGT_CROP_ACTIVE;
1525
1526                         ret = ops->vidioc_s_selection(file, fh, &s);
1527                 }
1528                 break;
1529         }
1530         case VIDIOC_G_SELECTION:
1531         {
1532                 struct v4l2_selection *p = arg;
1533
1534                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1535
1536                 ret = ops->vidioc_g_selection(file, fh, p);
1537                 if (!ret)
1538                         dbgrect(vfd, "", &p->r);
1539                 break;
1540         }
1541         case VIDIOC_S_SELECTION:
1542         {
1543                 struct v4l2_selection *p = arg;
1544
1545
1546                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1547                 dbgrect(vfd, "", &p->r);
1548
1549                 ret = ops->vidioc_s_selection(file, fh, p);
1550                 break;
1551         }
1552         case VIDIOC_CROPCAP:
1553         {
1554                 struct v4l2_cropcap *p = arg;
1555
1556                 /*FIXME: Should also show v4l2_fract pixelaspect */
1557                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1558                 if (ops->vidioc_cropcap) {
1559                         ret = ops->vidioc_cropcap(file, fh, p);
1560                 } else {
1561                         struct v4l2_selection s = { .type = p->type };
1562
1563                         /* obtaining bounds */
1564                         if (V4L2_TYPE_IS_OUTPUT(p->type))
1565                                 s.target = V4L2_SEL_TGT_COMPOSE_BOUNDS;
1566                         else
1567                                 s.target = V4L2_SEL_TGT_CROP_BOUNDS;
1568
1569                         ret = ops->vidioc_g_selection(file, fh, &s);
1570                         if (ret)
1571                                 break;
1572                         p->bounds = s.r;
1573
1574                         /* obtaining defrect */
1575                         if (V4L2_TYPE_IS_OUTPUT(p->type))
1576                                 s.target = V4L2_SEL_TGT_COMPOSE_DEFAULT;
1577                         else
1578                                 s.target = V4L2_SEL_TGT_CROP_DEFAULT;
1579
1580                         ret = ops->vidioc_g_selection(file, fh, &s);
1581                         if (ret)
1582                                 break;
1583                         p->defrect = s.r;
1584
1585                         /* setting trivial pixelaspect */
1586                         p->pixelaspect.numerator = 1;
1587                         p->pixelaspect.denominator = 1;
1588                 }
1589
1590                 if (!ret) {
1591                         dbgrect(vfd, "bounds ", &p->bounds);
1592                         dbgrect(vfd, "defrect ", &p->defrect);
1593                 }
1594                 break;
1595         }
1596         case VIDIOC_G_JPEGCOMP:
1597         {
1598                 struct v4l2_jpegcompression *p = arg;
1599
1600                 ret = ops->vidioc_g_jpegcomp(file, fh, p);
1601                 if (!ret)
1602                         dbgarg(cmd, "quality=%d, APPn=%d, "
1603                                         "APP_len=%d, COM_len=%d, "
1604                                         "jpeg_markers=%d\n",
1605                                         p->quality, p->APPn, p->APP_len,
1606                                         p->COM_len, p->jpeg_markers);
1607                 break;
1608         }
1609         case VIDIOC_S_JPEGCOMP:
1610         {
1611                 struct v4l2_jpegcompression *p = arg;
1612
1613                 dbgarg(cmd, "quality=%d, APPn=%d, APP_len=%d, "
1614                                         "COM_len=%d, jpeg_markers=%d\n",
1615                                         p->quality, p->APPn, p->APP_len,
1616                                         p->COM_len, p->jpeg_markers);
1617                 ret = ops->vidioc_s_jpegcomp(file, fh, p);
1618                 break;
1619         }
1620         case VIDIOC_G_ENC_INDEX:
1621         {
1622                 struct v4l2_enc_idx *p = arg;
1623
1624                 ret = ops->vidioc_g_enc_index(file, fh, p);
1625                 if (!ret)
1626                         dbgarg(cmd, "entries=%d, entries_cap=%d\n",
1627                                         p->entries, p->entries_cap);
1628                 break;
1629         }
1630         case VIDIOC_ENCODER_CMD:
1631         {
1632                 struct v4l2_encoder_cmd *p = arg;
1633
1634                 ret = ops->vidioc_encoder_cmd(file, fh, p);
1635                 if (!ret)
1636                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1637                 break;
1638         }
1639         case VIDIOC_TRY_ENCODER_CMD:
1640         {
1641                 struct v4l2_encoder_cmd *p = arg;
1642
1643                 ret = ops->vidioc_try_encoder_cmd(file, fh, p);
1644                 if (!ret)
1645                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1646                 break;
1647         }
1648         case VIDIOC_DECODER_CMD:
1649         {
1650                 struct v4l2_decoder_cmd *p = arg;
1651
1652                 ret = ops->vidioc_decoder_cmd(file, fh, p);
1653                 if (!ret)
1654                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1655                 break;
1656         }
1657         case VIDIOC_TRY_DECODER_CMD:
1658         {
1659                 struct v4l2_decoder_cmd *p = arg;
1660
1661                 ret = ops->vidioc_try_decoder_cmd(file, fh, p);
1662                 if (!ret)
1663                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1664                 break;
1665         }
1666         case VIDIOC_G_PARM:
1667         {
1668                 struct v4l2_streamparm *p = arg;
1669
1670                 if (ops->vidioc_g_parm) {
1671                         ret = check_fmt(ops, p->type);
1672                         if (ret)
1673                                 break;
1674                         ret = ops->vidioc_g_parm(file, fh, p);
1675                 } else {
1676                         v4l2_std_id std = vfd->current_norm;
1677
1678                         ret = -EINVAL;
1679                         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1680                                 break;
1681
1682                         ret = 0;
1683                         p->parm.capture.readbuffers = 2;
1684                         if (ops->vidioc_g_std)
1685                                 ret = ops->vidioc_g_std(file, fh, &std);
1686                         if (ret == 0)
1687                                 v4l2_video_std_frame_period(std,
1688                                                     &p->parm.capture.timeperframe);
1689                 }
1690
1691                 dbgarg(cmd, "type=%d\n", p->type);
1692                 break;
1693         }
1694         case VIDIOC_S_PARM:
1695         {
1696                 struct v4l2_streamparm *p = arg;
1697
1698                 ret = check_fmt(ops, p->type);
1699                 if (ret)
1700                         break;
1701
1702                 dbgarg(cmd, "type=%d\n", p->type);
1703                 ret = ops->vidioc_s_parm(file, fh, p);
1704                 break;
1705         }
1706         case VIDIOC_G_TUNER:
1707         {
1708                 struct v4l2_tuner *p = arg;
1709
1710                 p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1711                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1712                 ret = ops->vidioc_g_tuner(file, fh, p);
1713                 if (!ret)
1714                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1715                                         "capability=0x%x, rangelow=%d, "
1716                                         "rangehigh=%d, signal=%d, afc=%d, "
1717                                         "rxsubchans=0x%x, audmode=%d\n",
1718                                         p->index, p->name, p->type,
1719                                         p->capability, p->rangelow,
1720                                         p->rangehigh, p->signal, p->afc,
1721                                         p->rxsubchans, p->audmode);
1722                 break;
1723         }
1724         case VIDIOC_S_TUNER:
1725         {
1726                 struct v4l2_tuner *p = arg;
1727
1728                 p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1729                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1730                 dbgarg(cmd, "index=%d, name=%s, type=%d, "
1731                                 "capability=0x%x, rangelow=%d, "
1732                                 "rangehigh=%d, signal=%d, afc=%d, "
1733                                 "rxsubchans=0x%x, audmode=%d\n",
1734                                 p->index, p->name, p->type,
1735                                 p->capability, p->rangelow,
1736                                 p->rangehigh, p->signal, p->afc,
1737                                 p->rxsubchans, p->audmode);
1738                 ret = ops->vidioc_s_tuner(file, fh, p);
1739                 break;
1740         }
1741         case VIDIOC_G_FREQUENCY:
1742         {
1743                 struct v4l2_frequency *p = arg;
1744
1745                 p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1746                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1747                 ret = ops->vidioc_g_frequency(file, fh, p);
1748                 if (!ret)
1749                         dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1750                                         p->tuner, p->type, p->frequency);
1751                 break;
1752         }
1753         case VIDIOC_S_FREQUENCY:
1754         {
1755                 struct v4l2_frequency *p = arg;
1756                 enum v4l2_tuner_type type;
1757
1758                 type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1759                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1760                 dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1761                                 p->tuner, p->type, p->frequency);
1762                 if (p->type != type)
1763                         ret = -EINVAL;
1764                 else
1765                         ret = ops->vidioc_s_frequency(file, fh, p);
1766                 break;
1767         }
1768         case VIDIOC_G_SLICED_VBI_CAP:
1769         {
1770                 struct v4l2_sliced_vbi_cap *p = arg;
1771
1772                 /* Clear up to type, everything after type is zerod already */
1773                 memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
1774
1775                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1776                 ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);
1777                 if (!ret)
1778                         dbgarg2("service_set=%d\n", p->service_set);
1779                 break;
1780         }
1781         case VIDIOC_LOG_STATUS:
1782         {
1783                 if (vfd->v4l2_dev)
1784                         pr_info("%s: =================  START STATUS  =================\n",
1785                                 vfd->v4l2_dev->name);
1786                 ret = ops->vidioc_log_status(file, fh);
1787                 if (vfd->v4l2_dev)
1788                         pr_info("%s: ==================  END STATUS  ==================\n",
1789                                 vfd->v4l2_dev->name);
1790                 break;
1791         }
1792         case VIDIOC_DBG_G_REGISTER:
1793         {
1794 #ifdef CONFIG_VIDEO_ADV_DEBUG
1795                 struct v4l2_dbg_register *p = arg;
1796
1797                 if (!capable(CAP_SYS_ADMIN))
1798                         ret = -EPERM;
1799                 else
1800                         ret = ops->vidioc_g_register(file, fh, p);
1801 #endif
1802                 break;
1803         }
1804         case VIDIOC_DBG_S_REGISTER:
1805         {
1806 #ifdef CONFIG_VIDEO_ADV_DEBUG
1807                 struct v4l2_dbg_register *p = arg;
1808
1809                 if (!capable(CAP_SYS_ADMIN))
1810                         ret = -EPERM;
1811                 else
1812                         ret = ops->vidioc_s_register(file, fh, p);
1813 #endif
1814                 break;
1815         }
1816         case VIDIOC_DBG_G_CHIP_IDENT:
1817         {
1818                 struct v4l2_dbg_chip_ident *p = arg;
1819
1820                 p->ident = V4L2_IDENT_NONE;
1821                 p->revision = 0;
1822                 ret = ops->vidioc_g_chip_ident(file, fh, p);
1823                 if (!ret)
1824                         dbgarg(cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
1825                 break;
1826         }
1827         case VIDIOC_S_HW_FREQ_SEEK:
1828         {
1829                 struct v4l2_hw_freq_seek *p = arg;
1830                 enum v4l2_tuner_type type;
1831
1832                 type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1833                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1834                 dbgarg(cmd,
1835                         "tuner=%u, type=%u, seek_upward=%u, wrap_around=%u, spacing=%u\n",
1836                         p->tuner, p->type, p->seek_upward, p->wrap_around, p->spacing);
1837                 if (p->type != type)
1838                         ret = -EINVAL;
1839                 else
1840                         ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
1841                 break;
1842         }
1843         case VIDIOC_ENUM_FRAMESIZES:
1844         {
1845                 struct v4l2_frmsizeenum *p = arg;
1846
1847                 ret = ops->vidioc_enum_framesizes(file, fh, p);
1848                 dbgarg(cmd,
1849                         "index=%d, pixelformat=%c%c%c%c, type=%d ",
1850                         p->index,
1851                         (p->pixel_format & 0xff),
1852                         (p->pixel_format >>  8) & 0xff,
1853                         (p->pixel_format >> 16) & 0xff,
1854                         (p->pixel_format >> 24) & 0xff,
1855                         p->type);
1856                 switch (p->type) {
1857                 case V4L2_FRMSIZE_TYPE_DISCRETE:
1858                         dbgarg3("width = %d, height=%d\n",
1859                                 p->discrete.width, p->discrete.height);
1860                         break;
1861                 case V4L2_FRMSIZE_TYPE_STEPWISE:
1862                         dbgarg3("min %dx%d, max %dx%d, step %dx%d\n",
1863                                 p->stepwise.min_width,  p->stepwise.min_height,
1864                                 p->stepwise.step_width, p->stepwise.step_height,
1865                                 p->stepwise.max_width,  p->stepwise.max_height);
1866                         break;
1867                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1868                         dbgarg3("continuous\n");
1869                         break;
1870                 default:
1871                         dbgarg3("- Unknown type!\n");
1872                 }
1873
1874                 break;
1875         }
1876         case VIDIOC_ENUM_FRAMEINTERVALS:
1877         {
1878                 struct v4l2_frmivalenum *p = arg;
1879
1880                 ret = ops->vidioc_enum_frameintervals(file, fh, p);
1881                 dbgarg(cmd,
1882                         "index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
1883                         p->index, p->pixel_format,
1884                         p->width, p->height, p->type);
1885                 switch (p->type) {
1886                 case V4L2_FRMIVAL_TYPE_DISCRETE:
1887                         dbgarg2("fps=%d/%d\n",
1888                                 p->discrete.numerator,
1889                                 p->discrete.denominator);
1890                         break;
1891                 case V4L2_FRMIVAL_TYPE_STEPWISE:
1892                         dbgarg2("min=%d/%d, max=%d/%d, step=%d/%d\n",
1893                                 p->stepwise.min.numerator,
1894                                 p->stepwise.min.denominator,
1895                                 p->stepwise.max.numerator,
1896                                 p->stepwise.max.denominator,
1897                                 p->stepwise.step.numerator,
1898                                 p->stepwise.step.denominator);
1899                         break;
1900                 case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1901                         dbgarg2("continuous\n");
1902                         break;
1903                 default:
1904                         dbgarg2("- Unknown type!\n");
1905                 }
1906                 break;
1907         }
1908         case VIDIOC_ENUM_DV_PRESETS:
1909         {
1910                 struct v4l2_dv_enum_preset *p = arg;
1911
1912                 ret = ops->vidioc_enum_dv_presets(file, fh, p);
1913                 if (!ret)
1914                         dbgarg(cmd,
1915                                 "index=%d, preset=%d, name=%s, width=%d,"
1916                                 " height=%d ",
1917                                 p->index, p->preset, p->name, p->width,
1918                                 p->height);
1919                 break;
1920         }
1921         case VIDIOC_S_DV_PRESET:
1922         {
1923                 struct v4l2_dv_preset *p = arg;
1924
1925                 dbgarg(cmd, "preset=%d\n", p->preset);
1926                 ret = ops->vidioc_s_dv_preset(file, fh, p);
1927                 break;
1928         }
1929         case VIDIOC_G_DV_PRESET:
1930         {
1931                 struct v4l2_dv_preset *p = arg;
1932
1933                 ret = ops->vidioc_g_dv_preset(file, fh, p);
1934                 if (!ret)
1935                         dbgarg(cmd, "preset=%d\n", p->preset);
1936                 break;
1937         }
1938         case VIDIOC_QUERY_DV_PRESET:
1939         {
1940                 struct v4l2_dv_preset *p = arg;
1941
1942                 ret = ops->vidioc_query_dv_preset(file, fh, p);
1943                 if (!ret)
1944                         dbgarg(cmd, "preset=%d\n", p->preset);
1945                 break;
1946         }
1947         case VIDIOC_S_DV_TIMINGS:
1948         {
1949                 struct v4l2_dv_timings *p = arg;
1950
1951                 dbgtimings(vfd, p);
1952                 switch (p->type) {
1953                 case V4L2_DV_BT_656_1120:
1954                         ret = ops->vidioc_s_dv_timings(file, fh, p);
1955                         break;
1956                 default:
1957                         ret = -EINVAL;
1958                         break;
1959                 }
1960                 break;
1961         }
1962         case VIDIOC_G_DV_TIMINGS:
1963         {
1964                 struct v4l2_dv_timings *p = arg;
1965
1966                 ret = ops->vidioc_g_dv_timings(file, fh, p);
1967                 if (!ret)
1968                         dbgtimings(vfd, p);
1969                 break;
1970         }
1971         case VIDIOC_ENUM_DV_TIMINGS:
1972         {
1973                 struct v4l2_enum_dv_timings *p = arg;
1974
1975                 if (!ops->vidioc_enum_dv_timings)
1976                         break;
1977
1978                 ret = ops->vidioc_enum_dv_timings(file, fh, p);
1979                 if (!ret) {
1980                         dbgarg(cmd, "index=%d: ", p->index);
1981                         dbgtimings(vfd, &p->timings);
1982                 }
1983                 break;
1984         }
1985         case VIDIOC_QUERY_DV_TIMINGS:
1986         {
1987                 struct v4l2_dv_timings *p = arg;
1988
1989                 if (!ops->vidioc_query_dv_timings)
1990                         break;
1991
1992                 ret = ops->vidioc_query_dv_timings(file, fh, p);
1993                 if (!ret)
1994                         dbgtimings(vfd, p);
1995                 break;
1996         }
1997         case VIDIOC_DV_TIMINGS_CAP:
1998         {
1999                 struct v4l2_dv_timings_cap *p = arg;
2000
2001                 if (!ops->vidioc_dv_timings_cap)
2002                         break;
2003
2004                 ret = ops->vidioc_dv_timings_cap(file, fh, p);
2005                 if (ret)
2006                         break;
2007                 switch (p->type) {
2008                 case V4L2_DV_BT_656_1120:
2009                         dbgarg(cmd,
2010                                "type=%d, width=%u-%u, height=%u-%u, "
2011                                "pixelclock=%llu-%llu, standards=%x, capabilities=%x ",
2012                                p->type,
2013                                p->bt.min_width, p->bt.max_width,
2014                                p->bt.min_height, p->bt.max_height,
2015                                p->bt.min_pixelclock, p->bt.max_pixelclock,
2016                                p->bt.standards, p->bt.capabilities);
2017                         break;
2018                 default:
2019                         dbgarg(cmd, "unknown type ");
2020                         break;
2021                 }
2022                 break;
2023         }
2024         case VIDIOC_DQEVENT:
2025         {
2026                 struct v4l2_event *ev = arg;
2027
2028                 ret = v4l2_event_dequeue(fh, ev, file->f_flags & O_NONBLOCK);
2029                 if (ret < 0) {
2030                         dbgarg(cmd, "no pending events?");
2031                         break;
2032                 }
2033                 dbgarg(cmd,
2034                        "pending=%d, type=0x%8.8x, sequence=%d, "
2035                        "timestamp=%lu.%9.9lu ",
2036                        ev->pending, ev->type, ev->sequence,
2037                        ev->timestamp.tv_sec, ev->timestamp.tv_nsec);
2038                 break;
2039         }
2040         case VIDIOC_SUBSCRIBE_EVENT:
2041         {
2042                 struct v4l2_event_subscription *sub = arg;
2043
2044                 ret = ops->vidioc_subscribe_event(fh, sub);
2045                 if (ret < 0) {
2046                         dbgarg(cmd, "failed, ret=%ld", ret);
2047                         break;
2048                 }
2049                 dbgarg(cmd, "type=0x%8.8x", sub->type);
2050                 break;
2051         }
2052         case VIDIOC_UNSUBSCRIBE_EVENT:
2053         {
2054                 struct v4l2_event_subscription *sub = arg;
2055
2056                 ret = ops->vidioc_unsubscribe_event(fh, sub);
2057                 if (ret < 0) {
2058                         dbgarg(cmd, "failed, ret=%ld", ret);
2059                         break;
2060                 }
2061                 dbgarg(cmd, "type=0x%8.8x", sub->type);
2062                 break;
2063         }
2064         case VIDIOC_CREATE_BUFS:
2065         {
2066                 struct v4l2_create_buffers *create = arg;
2067
2068                 ret = check_fmt(ops, create->format.type);
2069                 if (ret)
2070                         break;
2071
2072                 ret = ops->vidioc_create_bufs(file, fh, create);
2073
2074                 dbgarg(cmd, "count=%d @ %d\n", create->count, create->index);
2075                 break;
2076         }
2077         case VIDIOC_PREPARE_BUF:
2078         {
2079                 struct v4l2_buffer *b = arg;
2080
2081                 ret = check_fmt(ops, b->type);
2082                 if (ret)
2083                         break;
2084
2085                 ret = ops->vidioc_prepare_buf(file, fh, b);
2086
2087                 dbgarg(cmd, "index=%d", b->index);
2088                 break;
2089         }
2090         default:
2091                 if (!ops->vidioc_default)
2092                         break;
2093                 ret = ops->vidioc_default(file, fh, use_fh_prio ?
2094                                 v4l2_prio_check(vfd->prio, vfh->prio) >= 0 : 0,
2095                                 cmd, arg);
2096                 break;
2097         } /* switch */
2098
2099         if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
2100                 if (ret < 0) {
2101                         v4l_print_ioctl(vfd->name, cmd);
2102                         printk(KERN_CONT " error %ld\n", ret);
2103                 }
2104         }
2105
2106         return ret;
2107 }
2108
2109 /* In some cases, only a few fields are used as input, i.e. when the app sets
2110  * "index" and then the driver fills in the rest of the structure for the thing
2111  * with that index.  We only need to copy up the first non-input field.  */
2112 static unsigned long cmd_input_size(unsigned int cmd)
2113 {
2114         /* Size of structure up to and including 'field' */
2115 #define CMDINSIZE(cmd, type, field)                             \
2116         case VIDIOC_##cmd:                                      \
2117                 return offsetof(struct v4l2_##type, field) +    \
2118                         sizeof(((struct v4l2_##type *)0)->field);
2119
2120         switch (cmd) {
2121                 CMDINSIZE(ENUM_FMT,             fmtdesc,        type);
2122                 CMDINSIZE(G_FMT,                format,         type);
2123                 CMDINSIZE(QUERYBUF,             buffer,         length);
2124                 CMDINSIZE(G_PARM,               streamparm,     type);
2125                 CMDINSIZE(ENUMSTD,              standard,       index);
2126                 CMDINSIZE(ENUMINPUT,            input,          index);
2127                 CMDINSIZE(G_CTRL,               control,        id);
2128                 CMDINSIZE(G_TUNER,              tuner,          index);
2129                 CMDINSIZE(QUERYCTRL,            queryctrl,      id);
2130                 CMDINSIZE(QUERYMENU,            querymenu,      index);
2131                 CMDINSIZE(ENUMOUTPUT,           output,         index);
2132                 CMDINSIZE(G_MODULATOR,          modulator,      index);
2133                 CMDINSIZE(G_FREQUENCY,          frequency,      tuner);
2134                 CMDINSIZE(CROPCAP,              cropcap,        type);
2135                 CMDINSIZE(G_CROP,               crop,           type);
2136                 CMDINSIZE(ENUMAUDIO,            audio,          index);
2137                 CMDINSIZE(ENUMAUDOUT,           audioout,       index);
2138                 CMDINSIZE(ENCODER_CMD,          encoder_cmd,    flags);
2139                 CMDINSIZE(TRY_ENCODER_CMD,      encoder_cmd,    flags);
2140                 CMDINSIZE(G_SLICED_VBI_CAP,     sliced_vbi_cap, type);
2141                 CMDINSIZE(ENUM_FRAMESIZES,      frmsizeenum,    pixel_format);
2142                 CMDINSIZE(ENUM_FRAMEINTERVALS,  frmivalenum,    height);
2143         default:
2144                 return _IOC_SIZE(cmd);
2145         }
2146 }
2147
2148 static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
2149                             void * __user *user_ptr, void ***kernel_ptr)
2150 {
2151         int ret = 0;
2152
2153         switch (cmd) {
2154         case VIDIOC_QUERYBUF:
2155         case VIDIOC_QBUF:
2156         case VIDIOC_DQBUF: {
2157                 struct v4l2_buffer *buf = parg;
2158
2159                 if (V4L2_TYPE_IS_MULTIPLANAR(buf->type) && buf->length > 0) {
2160                         if (buf->length > VIDEO_MAX_PLANES) {
2161                                 ret = -EINVAL;
2162                                 break;
2163                         }
2164                         *user_ptr = (void __user *)buf->m.planes;
2165                         *kernel_ptr = (void *)&buf->m.planes;
2166                         *array_size = sizeof(struct v4l2_plane) * buf->length;
2167                         ret = 1;
2168                 }
2169                 break;
2170         }
2171
2172         case VIDIOC_S_EXT_CTRLS:
2173         case VIDIOC_G_EXT_CTRLS:
2174         case VIDIOC_TRY_EXT_CTRLS: {
2175                 struct v4l2_ext_controls *ctrls = parg;
2176
2177                 if (ctrls->count != 0) {
2178                         if (ctrls->count > V4L2_CID_MAX_CTRLS) {
2179                                 ret = -EINVAL;
2180                                 break;
2181                         }
2182                         *user_ptr = (void __user *)ctrls->controls;
2183                         *kernel_ptr = (void *)&ctrls->controls;
2184                         *array_size = sizeof(struct v4l2_ext_control)
2185                                     * ctrls->count;
2186                         ret = 1;
2187                 }
2188                 break;
2189         }
2190         }
2191
2192         return ret;
2193 }
2194
2195 long
2196 video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
2197                v4l2_kioctl func)
2198 {
2199         char    sbuf[128];
2200         void    *mbuf = NULL;
2201         void    *parg = (void *)arg;
2202         long    err  = -EINVAL;
2203         bool    has_array_args;
2204         size_t  array_size = 0;
2205         void __user *user_ptr = NULL;
2206         void    **kernel_ptr = NULL;
2207
2208         /*  Copy arguments into temp kernel buffer  */
2209         if (_IOC_DIR(cmd) != _IOC_NONE) {
2210                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
2211                         parg = sbuf;
2212                 } else {
2213                         /* too big to allocate from stack */
2214                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
2215                         if (NULL == mbuf)
2216                                 return -ENOMEM;
2217                         parg = mbuf;
2218                 }
2219
2220                 err = -EFAULT;
2221                 if (_IOC_DIR(cmd) & _IOC_WRITE) {
2222                         unsigned long n = cmd_input_size(cmd);
2223
2224                         if (copy_from_user(parg, (void __user *)arg, n))
2225                                 goto out;
2226
2227                         /* zero out anything we don't copy from userspace */
2228                         if (n < _IOC_SIZE(cmd))
2229                                 memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
2230                 } else {
2231                         /* read-only ioctl */
2232                         memset(parg, 0, _IOC_SIZE(cmd));
2233                 }
2234         }
2235
2236         err = check_array_args(cmd, parg, &array_size, &user_ptr, &kernel_ptr);
2237         if (err < 0)
2238                 goto out;
2239         has_array_args = err;
2240
2241         if (has_array_args) {
2242                 /*
2243                  * When adding new types of array args, make sure that the
2244                  * parent argument to ioctl (which contains the pointer to the
2245                  * array) fits into sbuf (so that mbuf will still remain
2246                  * unused up to here).
2247                  */
2248                 mbuf = kmalloc(array_size, GFP_KERNEL);
2249                 err = -ENOMEM;
2250                 if (NULL == mbuf)
2251                         goto out_array_args;
2252                 err = -EFAULT;
2253                 if (copy_from_user(mbuf, user_ptr, array_size))
2254                         goto out_array_args;
2255                 *kernel_ptr = mbuf;
2256         }
2257
2258         /* Handles IOCTL */
2259         err = func(file, cmd, parg);
2260         if (err == -ENOIOCTLCMD)
2261                 err = -ENOTTY;
2262
2263         if (has_array_args) {
2264                 *kernel_ptr = user_ptr;
2265                 if (copy_to_user(user_ptr, mbuf, array_size))
2266                         err = -EFAULT;
2267                 goto out_array_args;
2268         }
2269         /* VIDIOC_QUERY_DV_TIMINGS can return an error, but still have valid
2270            results that must be returned. */
2271         if (err < 0 && cmd != VIDIOC_QUERY_DV_TIMINGS)
2272                 goto out;
2273
2274 out_array_args:
2275         /*  Copy results into user buffer  */
2276         switch (_IOC_DIR(cmd)) {
2277         case _IOC_READ:
2278         case (_IOC_WRITE | _IOC_READ):
2279                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
2280                         err = -EFAULT;
2281                 break;
2282         }
2283
2284 out:
2285         kfree(mbuf);
2286         return err;
2287 }
2288 EXPORT_SYMBOL(video_usercopy);
2289
2290 long video_ioctl2(struct file *file,
2291                unsigned int cmd, unsigned long arg)
2292 {
2293         return video_usercopy(file, cmd, arg, __video_do_ioctl);
2294 }
2295 EXPORT_SYMBOL(video_ioctl2);