drivers/media/v4l2-core/v4l2-subdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * V4L2 sub-device
   4  *
   5  * Copyright (C) 2010 Nokia Corporation
   6  *
   7  * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   8  *          Sakari Ailus <sakari.ailus@iki.fi>
   9  */
  10
  11 #include <linux/ioctl.h>
  12 #include <linux/mm.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/types.h>
  16 #include <linux/videodev2.h>
  17 #include <linux/export.h>
  18
  19 #include <media/v4l2-ctrls.h>
  20 #include <media/v4l2-device.h>
  21 #include <media/v4l2-ioctl.h>
  22 #include <media/v4l2-fh.h>
  23 #include <media/v4l2-event.h>
  24
  25 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  26 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
  27 {
  28         if (sd->entity.num_pads) {
  29                 fh->pad = v4l2_subdev_alloc_pad_config(sd);
  30                 if (fh->pad == NULL)
  31                         return -ENOMEM;
  32         }
  33
  34         return 0;
  35 }
  36
  37 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
  38 {
  39         v4l2_subdev_free_pad_config(fh->pad);
  40         fh->pad = NULL;
  41 }
  42
  43 static int subdev_open(struct file *file)
  44 {
  45         struct video_device *vdev = video_devdata(file);
  46         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  47         struct v4l2_subdev_fh *subdev_fh;
  48         int ret;
  49
  50         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
  51         if (subdev_fh == NULL)
  52                 return -ENOMEM;
  53
  54         ret = subdev_fh_init(subdev_fh, sd);
  55         if (ret) {
  56                 kfree(subdev_fh);
  57                 return ret;
  58         }
  59
  60         v4l2_fh_init(&subdev_fh->vfh, vdev);
  61         v4l2_fh_add(&subdev_fh->vfh);
  62         file->private_data = &subdev_fh->vfh;
  63 #if defined(CONFIG_MEDIA_CONTROLLER)
  64         if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
  65                 struct module *owner;
  66
  67                 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
  68                 if (!try_module_get(owner)) {
  69                         ret = -EBUSY;
  70                         goto err;
  71                 }
  72                 subdev_fh->owner = owner;
  73         }
  74 #endif
  75
  76         if (sd->internal_ops && sd->internal_ops->open) {
  77                 ret = sd->internal_ops->open(sd, subdev_fh);
  78                 if (ret < 0)
  79                         goto err;
  80         }
  81
  82         return 0;
  83
  84 err:
  85         module_put(subdev_fh->owner);
  86         v4l2_fh_del(&subdev_fh->vfh);
  87         v4l2_fh_exit(&subdev_fh->vfh);
  88         subdev_fh_free(subdev_fh);
  89         kfree(subdev_fh);
  90
  91         return ret;
  92 }
  93
  94 static int subdev_close(struct file *file)
  95 {
  96         struct video_device *vdev = video_devdata(file);
  97         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  98         struct v4l2_fh *vfh = file->private_data;
  99         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 100
 101         if (sd->internal_ops && sd->internal_ops->close)
 102                 sd->internal_ops->close(sd, subdev_fh);
 103         module_put(subdev_fh->owner);
 104         v4l2_fh_del(vfh);
 105         v4l2_fh_exit(vfh);
 106         subdev_fh_free(subdev_fh);
 107         kfree(subdev_fh);
 108         file->private_data = NULL;
 109
 110         return 0;
 111 }
 112 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 113 static int subdev_open(struct file *file)
 114 {
 115         return -ENODEV;
 116 }
 117
 118 static int subdev_close(struct file *file)
 119 {
 120         return -ENODEV;
 121 }
 122 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 123
 124 static inline int check_which(u32 which)
 125 {
 126         if (which != V4L2_SUBDEV_FORMAT_TRY &&
 127             which != V4L2_SUBDEV_FORMAT_ACTIVE)
 128                 return -EINVAL;
 129
 130         return 0;
 131 }
 132
 133 static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
 134 {
 135 #if defined(CONFIG_MEDIA_CONTROLLER)
 136         if (sd->entity.num_pads) {
 137                 if (pad >= sd->entity.num_pads)
 138                         return -EINVAL;
 139                 return 0;
 140         }
 141 #endif
 142         /* allow pad 0 on subdevices not registered as media entities */
 143         if (pad > 0)
 144                 return -EINVAL;
 145         return 0;
 146 }
 147
 148 static int check_cfg(u32 which, struct v4l2_subdev_pad_config *cfg)
 149 {
 150         if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
 151                 return -EINVAL;
 152
 153         return 0;
 154 }
 155
 156 static inline int check_format(struct v4l2_subdev *sd,
 157                                struct v4l2_subdev_pad_config *cfg,
 158                                struct v4l2_subdev_format *format)
 159 {
 160         if (!format)
 161                 return -EINVAL;
 162
 163         return check_which(format->which) ? : check_pad(sd, format->pad) ? :
 164                check_cfg(format->which, cfg);
 165 }
 166
 167 static int call_get_fmt(struct v4l2_subdev *sd,
 168                         struct v4l2_subdev_pad_config *cfg,
 169                         struct v4l2_subdev_format *format)
 170 {
 171         return check_format(sd, cfg, format) ? :
 172                sd->ops->pad->get_fmt(sd, cfg, format);
 173 }
 174
 175 static int call_set_fmt(struct v4l2_subdev *sd,
 176                         struct v4l2_subdev_pad_config *cfg,
 177                         struct v4l2_subdev_format *format)
 178 {
 179         return check_format(sd, cfg, format) ? :
 180                sd->ops->pad->set_fmt(sd, cfg, format);
 181 }
 182
 183 static int call_enum_mbus_code(struct v4l2_subdev *sd,
 184                                struct v4l2_subdev_pad_config *cfg,
 185                                struct v4l2_subdev_mbus_code_enum *code)
 186 {
 187         if (!code)
 188                 return -EINVAL;
 189
 190         return check_which(code->which) ? : check_pad(sd, code->pad) ? :
 191                check_cfg(code->which, cfg) ? :
 192                sd->ops->pad->enum_mbus_code(sd, cfg, code);
 193 }
 194
 195 static int call_enum_frame_size(struct v4l2_subdev *sd,
 196                                 struct v4l2_subdev_pad_config *cfg,
 197                                 struct v4l2_subdev_frame_size_enum *fse)
 198 {
 199         if (!fse)
 200                 return -EINVAL;
 201
 202         return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
 203                check_cfg(fse->which, cfg) ? :
 204                sd->ops->pad->enum_frame_size(sd, cfg, fse);
 205 }
 206
 207 static inline int check_frame_interval(struct v4l2_subdev *sd,
 208                                        struct v4l2_subdev_frame_interval *fi)
 209 {
 210         if (!fi)
 211                 return -EINVAL;
 212
 213         return check_pad(sd, fi->pad);
 214 }
 215
 216 static int call_g_frame_interval(struct v4l2_subdev *sd,
 217                                  struct v4l2_subdev_frame_interval *fi)
 218 {
 219         return check_frame_interval(sd, fi) ? :
 220                sd->ops->video->g_frame_interval(sd, fi);
 221 }
 222
 223 static int call_s_frame_interval(struct v4l2_subdev *sd,
 224                                  struct v4l2_subdev_frame_interval *fi)
 225 {
 226         return check_frame_interval(sd, fi) ? :
 227                sd->ops->video->s_frame_interval(sd, fi);
 228 }
 229
 230 static int call_enum_frame_interval(struct v4l2_subdev *sd,
 231                                     struct v4l2_subdev_pad_config *cfg,
 232                                     struct v4l2_subdev_frame_interval_enum *fie)
 233 {
 234         if (!fie)
 235                 return -EINVAL;
 236
 237         return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
 238                check_cfg(fie->which, cfg) ? :
 239                sd->ops->pad->enum_frame_interval(sd, cfg, fie);
 240 }
 241
 242 static inline int check_selection(struct v4l2_subdev *sd,
 243                                   struct v4l2_subdev_pad_config *cfg,
 244                                   struct v4l2_subdev_selection *sel)
 245 {
 246         if (!sel)
 247                 return -EINVAL;
 248
 249         return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
 250                check_cfg(sel->which, cfg);
 251 }
 252
 253 static int call_get_selection(struct v4l2_subdev *sd,
 254                               struct v4l2_subdev_pad_config *cfg,
 255                               struct v4l2_subdev_selection *sel)
 256 {
 257         return check_selection(sd, cfg, sel) ? :
 258                sd->ops->pad->get_selection(sd, cfg, sel);
 259 }
 260
 261 static int call_set_selection(struct v4l2_subdev *sd,
 262                               struct v4l2_subdev_pad_config *cfg,
 263                               struct v4l2_subdev_selection *sel)
 264 {
 265         return check_selection(sd, cfg, sel) ? :
 266                sd->ops->pad->set_selection(sd, cfg, sel);
 267 }
 268
 269 static inline int check_edid(struct v4l2_subdev *sd,
 270                              struct v4l2_subdev_edid *edid)
 271 {
 272         if (!edid)
 273                 return -EINVAL;
 274
 275         if (edid->blocks && edid->edid == NULL)
 276                 return -EINVAL;
 277
 278         return check_pad(sd, edid->pad);
 279 }
 280
 281 static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 282 {
 283         return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
 284 }
 285
 286 static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 287 {
 288         return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
 289 }
 290
 291 static int call_dv_timings_cap(struct v4l2_subdev *sd,
 292                                struct v4l2_dv_timings_cap *cap)
 293 {
 294         if (!cap)
 295                 return -EINVAL;
 296
 297         return check_pad(sd, cap->pad) ? :
 298                sd->ops->pad->dv_timings_cap(sd, cap);
 299 }
 300
 301 static int call_enum_dv_timings(struct v4l2_subdev *sd,
 302                                 struct v4l2_enum_dv_timings *dvt)
 303 {
 304         if (!dvt)
 305                 return -EINVAL;
 306
 307         return check_pad(sd, dvt->pad) ? :
 308                sd->ops->pad->enum_dv_timings(sd, dvt);
 309 }
 310
 311 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
 312         .get_fmt                = call_get_fmt,
 313         .set_fmt                = call_set_fmt,
 314         .enum_mbus_code         = call_enum_mbus_code,
 315         .enum_frame_size        = call_enum_frame_size,
 316         .enum_frame_interval    = call_enum_frame_interval,
 317         .get_selection          = call_get_selection,
 318         .set_selection          = call_set_selection,
 319         .get_edid               = call_get_edid,
 320         .set_edid               = call_set_edid,
 321         .dv_timings_cap         = call_dv_timings_cap,
 322         .enum_dv_timings        = call_enum_dv_timings,
 323 };
 324
 325 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
 326         .g_frame_interval       = call_g_frame_interval,
 327         .s_frame_interval       = call_s_frame_interval,
 328 };
 329
 330 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
 331         .pad    = &v4l2_subdev_call_pad_wrappers,
 332         .video  = &v4l2_subdev_call_video_wrappers,
 333 };
 334 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
 335
 336 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 337 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 338 {
 339         struct video_device *vdev = video_devdata(file);
 340         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 341         struct v4l2_fh *vfh = file->private_data;
 342         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 343         bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
 344         int rval;
 345
 346         switch (cmd) {
 347         case VIDIOC_QUERYCTRL:
 348                 /*
 349                  * TODO: this really should be folded into v4l2_queryctrl (this
 350                  * currently returns -EINVAL for NULL control handlers).
 351                  * However, v4l2_queryctrl() is still called directly by
 352                  * drivers as well and until that has been addressed I believe
 353                  * it is safer to do the check here. The same is true for the
 354                  * other control ioctls below.
 355                  */
 356                 if (!vfh->ctrl_handler)
 357                         return -ENOTTY;
 358                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 359
 360         case VIDIOC_QUERY_EXT_CTRL:
 361                 if (!vfh->ctrl_handler)
 362                         return -ENOTTY;
 363                 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
 364
 365         case VIDIOC_QUERYMENU:
 366                 if (!vfh->ctrl_handler)
 367                         return -ENOTTY;
 368                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 369
 370         case VIDIOC_G_CTRL:
 371                 if (!vfh->ctrl_handler)
 372                         return -ENOTTY;
 373                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 374
 375         case VIDIOC_S_CTRL:
 376                 if (!vfh->ctrl_handler)
 377                         return -ENOTTY;
 378                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 379
 380         case VIDIOC_G_EXT_CTRLS:
 381                 if (!vfh->ctrl_handler)
 382                         return -ENOTTY;
 383                 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
 384                                         vdev, sd->v4l2_dev->mdev, arg);
 385
 386         case VIDIOC_S_EXT_CTRLS:
 387                 if (!vfh->ctrl_handler)
 388                         return -ENOTTY;
 389                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
 390                                         vdev, sd->v4l2_dev->mdev, arg);
 391
 392         case VIDIOC_TRY_EXT_CTRLS:
 393                 if (!vfh->ctrl_handler)
 394                         return -ENOTTY;
 395                 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
 396                                           vdev, sd->v4l2_dev->mdev, arg);
 397
 398         case VIDIOC_DQEVENT:
 399                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 400                         return -ENOIOCTLCMD;
 401
 402                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 403
 404         case VIDIOC_DQEVENT_TIME32: {
 405                 struct v4l2_event_time32 *ev32 = arg;
 406                 struct v4l2_event ev = { };
 407
 408                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 409                         return -ENOIOCTLCMD;
 410
 411                 rval = v4l2_event_dequeue(vfh, &ev, file->f_flags & O_NONBLOCK);
 412
 413                 *ev32 = (struct v4l2_event_time32) {
 414                         .type           = ev.type,
 415                         .pending        = ev.pending,
 416                         .sequence       = ev.sequence,
 417                         .timestamp.tv_sec  = ev.timestamp.tv_sec,
 418                         .timestamp.tv_nsec = ev.timestamp.tv_nsec,
 419                         .id             = ev.id,
 420                 };
 421
 422                 memcpy(&ev32->u, &ev.u, sizeof(ev.u));
 423                 memcpy(&ev32->reserved, &ev.reserved, sizeof(ev.reserved));
 424
 425                 return rval;
 426         }
 427
 428         case VIDIOC_SUBSCRIBE_EVENT:
 429                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 430
 431         case VIDIOC_UNSUBSCRIBE_EVENT:
 432                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 433
 434 #ifdef CONFIG_VIDEO_ADV_DEBUG
 435         case VIDIOC_DBG_G_REGISTER:
 436         {
 437                 struct v4l2_dbg_register *p = arg;
 438
 439                 if (!capable(CAP_SYS_ADMIN))
 440                         return -EPERM;
 441                 return v4l2_subdev_call(sd, core, g_register, p);
 442         }
 443         case VIDIOC_DBG_S_REGISTER:
 444         {
 445                 struct v4l2_dbg_register *p = arg;
 446
 447                 if (!capable(CAP_SYS_ADMIN))
 448                         return -EPERM;
 449                 return v4l2_subdev_call(sd, core, s_register, p);
 450         }
 451         case VIDIOC_DBG_G_CHIP_INFO:
 452         {
 453                 struct v4l2_dbg_chip_info *p = arg;
 454
 455                 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
 456                         return -EINVAL;
 457                 if (sd->ops->core && sd->ops->core->s_register)
 458                         p->flags |= V4L2_CHIP_FL_WRITABLE;
 459                 if (sd->ops->core && sd->ops->core->g_register)
 460                         p->flags |= V4L2_CHIP_FL_READABLE;
 461                 strscpy(p->name, sd->name, sizeof(p->name));
 462                 return 0;
 463         }
 464 #endif
 465
 466         case VIDIOC_LOG_STATUS: {
 467                 int ret;
 468
 469                 pr_info("%s: =================  START STATUS  =================\n",
 470                         sd->name);
 471                 ret = v4l2_subdev_call(sd, core, log_status);
 472                 pr_info("%s: ==================  END STATUS  ==================\n",
 473                         sd->name);
 474                 return ret;
 475         }
 476
 477         case VIDIOC_SUBDEV_G_FMT: {
 478                 struct v4l2_subdev_format *format = arg;
 479
 480                 memset(format->reserved, 0, sizeof(format->reserved));
 481                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 482                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
 483         }
 484
 485         case VIDIOC_SUBDEV_S_FMT: {
 486                 struct v4l2_subdev_format *format = arg;
 487
 488                 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 489                         return -EPERM;
 490
 491                 memset(format->reserved, 0, sizeof(format->reserved));
 492                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 493                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
 494         }
 495
 496         case VIDIOC_SUBDEV_G_CROP: {
 497                 struct v4l2_subdev_crop *crop = arg;
 498                 struct v4l2_subdev_selection sel;
 499
 500                 memset(crop->reserved, 0, sizeof(crop->reserved));
 501                 memset(&sel, 0, sizeof(sel));
 502                 sel.which = crop->which;
 503                 sel.pad = crop->pad;
 504                 sel.target = V4L2_SEL_TGT_CROP;
 505
 506                 rval = v4l2_subdev_call(
 507                         sd, pad, get_selection, subdev_fh->pad, &sel);
 508
 509                 crop->rect = sel.r;
 510
 511                 return rval;
 512         }
 513
 514         case VIDIOC_SUBDEV_S_CROP: {
 515                 struct v4l2_subdev_crop *crop = arg;
 516                 struct v4l2_subdev_selection sel;
 517
 518                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 519                         return -EPERM;
 520
 521                 memset(crop->reserved, 0, sizeof(crop->reserved));
 522                 memset(&sel, 0, sizeof(sel));
 523                 sel.which = crop->which;
 524                 sel.pad = crop->pad;
 525                 sel.target = V4L2_SEL_TGT_CROP;
 526                 sel.r = crop->rect;
 527
 528                 rval = v4l2_subdev_call(
 529                         sd, pad, set_selection, subdev_fh->pad, &sel);
 530
 531                 crop->rect = sel.r;
 532
 533                 return rval;
 534         }
 535
 536         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 537                 struct v4l2_subdev_mbus_code_enum *code = arg;
 538
 539                 memset(code->reserved, 0, sizeof(code->reserved));
 540                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
 541                                         code);
 542         }
 543
 544         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 545                 struct v4l2_subdev_frame_size_enum *fse = arg;
 546
 547                 memset(fse->reserved, 0, sizeof(fse->reserved));
 548                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
 549                                         fse);
 550         }
 551
 552         case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
 553                 struct v4l2_subdev_frame_interval *fi = arg;
 554
 555                 memset(fi->reserved, 0, sizeof(fi->reserved));
 556                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 557         }
 558
 559         case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
 560                 struct v4l2_subdev_frame_interval *fi = arg;
 561
 562                 if (ro_subdev)
 563                         return -EPERM;
 564
 565                 memset(fi->reserved, 0, sizeof(fi->reserved));
 566                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 567         }
 568
 569         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 570                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 571
 572                 memset(fie->reserved, 0, sizeof(fie->reserved));
 573                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
 574                                         fie);
 575         }
 576
 577         case VIDIOC_SUBDEV_G_SELECTION: {
 578                 struct v4l2_subdev_selection *sel = arg;
 579
 580                 memset(sel->reserved, 0, sizeof(sel->reserved));
 581                 return v4l2_subdev_call(
 582                         sd, pad, get_selection, subdev_fh->pad, sel);
 583         }
 584
 585         case VIDIOC_SUBDEV_S_SELECTION: {
 586                 struct v4l2_subdev_selection *sel = arg;
 587
 588                 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 589                         return -EPERM;
 590
 591                 memset(sel->reserved, 0, sizeof(sel->reserved));
 592                 return v4l2_subdev_call(
 593                         sd, pad, set_selection, subdev_fh->pad, sel);
 594         }
 595
 596         case VIDIOC_G_EDID: {
 597                 struct v4l2_subdev_edid *edid = arg;
 598
 599                 return v4l2_subdev_call(sd, pad, get_edid, edid);
 600         }
 601
 602         case VIDIOC_S_EDID: {
 603                 struct v4l2_subdev_edid *edid = arg;
 604
 605                 return v4l2_subdev_call(sd, pad, set_edid, edid);
 606         }
 607
 608         case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
 609                 struct v4l2_dv_timings_cap *cap = arg;
 610
 611                 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
 612         }
 613
 614         case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
 615                 struct v4l2_enum_dv_timings *dvt = arg;
 616
 617                 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
 618         }
 619
 620         case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
 621                 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
 622
 623         case VIDIOC_SUBDEV_G_DV_TIMINGS:
 624                 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
 625
 626         case VIDIOC_SUBDEV_S_DV_TIMINGS:
 627                 if (ro_subdev)
 628                         return -EPERM;
 629
 630                 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
 631
 632         case VIDIOC_SUBDEV_G_STD:
 633                 return v4l2_subdev_call(sd, video, g_std, arg);
 634
 635         case VIDIOC_SUBDEV_S_STD: {
 636                 v4l2_std_id *std = arg;
 637
 638                 if (ro_subdev)
 639                         return -EPERM;
 640
 641                 return v4l2_subdev_call(sd, video, s_std, *std);
 642         }
 643
 644         case VIDIOC_SUBDEV_ENUMSTD: {
 645                 struct v4l2_standard *p = arg;
 646                 v4l2_std_id id;
 647
 648                 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
 649                         return -EINVAL;
 650
 651                 return v4l_video_std_enumstd(p, id);
 652         }
 653
 654         case VIDIOC_SUBDEV_QUERYSTD:
 655                 return v4l2_subdev_call(sd, video, querystd, arg);
 656
 657         default:
 658                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 659         }
 660
 661         return 0;
 662 }
 663
 664 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
 665 {
 666         struct video_device *vdev = video_devdata(file);
 667         struct mutex *lock = vdev->lock;
 668         long ret = -ENODEV;
 669
 670         if (lock && mutex_lock_interruptible(lock))
 671                 return -ERESTARTSYS;
 672         if (video_is_registered(vdev))
 673                 ret = subdev_do_ioctl(file, cmd, arg);
 674         if (lock)
 675                 mutex_unlock(lock);
 676         return ret;
 677 }
 678
 679 static long subdev_ioctl(struct file *file, unsigned int cmd,
 680         unsigned long arg)
 681 {
 682         return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
 683 }
 684
 685 #ifdef CONFIG_COMPAT
 686 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 687         unsigned long arg)
 688 {
 689         struct video_device *vdev = video_devdata(file);
 690         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 691
 692         return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
 693 }
 694 #endif
 695
 696 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 697 static long subdev_ioctl(struct file *file, unsigned int cmd,
 698                          unsigned long arg)
 699 {
 700         return -ENODEV;
 701 }
 702
 703 #ifdef CONFIG_COMPAT
 704 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 705                                   unsigned long arg)
 706 {
 707         return -ENODEV;
 708 }
 709 #endif
 710 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 711
 712 static __poll_t subdev_poll(struct file *file, poll_table *wait)
 713 {
 714         struct video_device *vdev = video_devdata(file);
 715         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 716         struct v4l2_fh *fh = file->private_data;
 717
 718         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 719                 return EPOLLERR;
 720
 721         poll_wait(file, &fh->wait, wait);
 722
 723         if (v4l2_event_pending(fh))
 724                 return EPOLLPRI;
 725
 726         return 0;
 727 }
 728
 729 const struct v4l2_file_operations v4l2_subdev_fops = {
 730         .owner = THIS_MODULE,
 731         .open = subdev_open,
 732         .unlocked_ioctl = subdev_ioctl,
 733 #ifdef CONFIG_COMPAT
 734         .compat_ioctl32 = subdev_compat_ioctl32,
 735 #endif
 736         .release = subdev_close,
 737         .poll = subdev_poll,
 738 };
 739
 740 #ifdef CONFIG_MEDIA_CONTROLLER
 741 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
 742                                       struct media_link *link,
 743                                       struct v4l2_subdev_format *source_fmt,
 744                                       struct v4l2_subdev_format *sink_fmt)
 745 {
 746         /* The width, height and code must match. */
 747         if (source_fmt->format.width != sink_fmt->format.width
 748             || source_fmt->format.height != sink_fmt->format.height
 749             || source_fmt->format.code != sink_fmt->format.code)
 750                 return -EPIPE;
 751
 752         /* The field order must match, or the sink field order must be NONE
 753          * to support interlaced hardware connected to bridges that support
 754          * progressive formats only.
 755          */
 756         if (source_fmt->format.field != sink_fmt->format.field &&
 757             sink_fmt->format.field != V4L2_FIELD_NONE)
 758                 return -EPIPE;
 759
 760         return 0;
 761 }
 762 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
 763
 764 static int
 765 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
 766                                      struct v4l2_subdev_format *fmt)
 767 {
 768         if (is_media_entity_v4l2_subdev(pad->entity)) {
 769                 struct v4l2_subdev *sd =
 770                         media_entity_to_v4l2_subdev(pad->entity);
 771
 772                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
 773                 fmt->pad = pad->index;
 774                 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
 775         }
 776
 777         WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
 778              "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
 779              pad->entity->function, pad->entity->name);
 780
 781         return -EINVAL;
 782 }
 783
 784 int v4l2_subdev_link_validate(struct media_link *link)
 785 {
 786         struct v4l2_subdev *sink;
 787         struct v4l2_subdev_format sink_fmt, source_fmt;
 788         int rval;
 789
 790         rval = v4l2_subdev_link_validate_get_format(
 791                 link->source, &source_fmt);
 792         if (rval < 0)
 793                 return 0;
 794
 795         rval = v4l2_subdev_link_validate_get_format(
 796                 link->sink, &sink_fmt);
 797         if (rval < 0)
 798                 return 0;
 799
 800         sink = media_entity_to_v4l2_subdev(link->sink->entity);
 801
 802         rval = v4l2_subdev_call(sink, pad, link_validate, link,
 803                                 &source_fmt, &sink_fmt);
 804         if (rval != -ENOIOCTLCMD)
 805                 return rval;
 806
 807         return v4l2_subdev_link_validate_default(
 808                 sink, link, &source_fmt, &sink_fmt);
 809 }
 810 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
 811
 812 struct v4l2_subdev_pad_config *
 813 v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
 814 {
 815         struct v4l2_subdev_pad_config *cfg;
 816         int ret;
 817
 818         if (!sd->entity.num_pads)
 819                 return NULL;
 820
 821         cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
 822                              GFP_KERNEL | __GFP_ZERO);
 823         if (!cfg)
 824                 return NULL;
 825
 826         ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
 827         if (ret < 0 && ret != -ENOIOCTLCMD) {
 828                 kvfree(cfg);
 829                 return NULL;
 830         }
 831
 832         return cfg;
 833 }
 834 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
 835
 836 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
 837 {
 838         kvfree(cfg);
 839 }
 840 EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
 841 #endif /* CONFIG_MEDIA_CONTROLLER */
 842
 843 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 844 {
 845         INIT_LIST_HEAD(&sd->list);
 846         BUG_ON(!ops);
 847         sd->ops = ops;
 848         sd->v4l2_dev = NULL;
 849         sd->flags = 0;
 850         sd->name[0] = '\0';
 851         sd->grp_id = 0;
 852         sd->dev_priv = NULL;
 853         sd->host_priv = NULL;
 854 #if defined(CONFIG_MEDIA_CONTROLLER)
 855         sd->entity.name = sd->name;
 856         sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
 857         sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 858 #endif
 859 }
 860 EXPORT_SYMBOL(v4l2_subdev_init);
 861
 862 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 863                               const struct v4l2_event *ev)
 864 {
 865         v4l2_event_queue(sd->devnode, ev);
 866         v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
 867 }
 868 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);