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 #include <linux/version.h>
  19
  20 #include <media/v4l2-ctrls.h>
  21 #include <media/v4l2-device.h>
  22 #include <media/v4l2-ioctl.h>
  23 #include <media/v4l2-fh.h>
  24 #include <media/v4l2-event.h>
  25
  26 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  27 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
  28 {
  29         if (sd->entity.num_pads) {
  30                 fh->pad = v4l2_subdev_alloc_pad_config(sd);
  31                 if (fh->pad == NULL)
  32                         return -ENOMEM;
  33         }
  34
  35         return 0;
  36 }
  37
  38 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
  39 {
  40         v4l2_subdev_free_pad_config(fh->pad);
  41         fh->pad = NULL;
  42 }
  43
  44 static int subdev_open(struct file *file)
  45 {
  46         struct video_device *vdev = video_devdata(file);
  47         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  48         struct v4l2_subdev_fh *subdev_fh;
  49         int ret;
  50
  51         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
  52         if (subdev_fh == NULL)
  53                 return -ENOMEM;
  54
  55         ret = subdev_fh_init(subdev_fh, sd);
  56         if (ret) {
  57                 kfree(subdev_fh);
  58                 return ret;
  59         }
  60
  61         v4l2_fh_init(&subdev_fh->vfh, vdev);
  62         v4l2_fh_add(&subdev_fh->vfh);
  63         file->private_data = &subdev_fh->vfh;
  64 #if defined(CONFIG_MEDIA_CONTROLLER)
  65         if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
  66                 struct module *owner;
  67
  68                 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
  69                 if (!try_module_get(owner)) {
  70                         ret = -EBUSY;
  71                         goto err;
  72                 }
  73                 subdev_fh->owner = owner;
  74         }
  75 #endif
  76
  77         if (sd->internal_ops && sd->internal_ops->open) {
  78                 ret = sd->internal_ops->open(sd, subdev_fh);
  79                 if (ret < 0)
  80                         goto err;
  81         }
  82
  83         return 0;
  84
  85 err:
  86         module_put(subdev_fh->owner);
  87         v4l2_fh_del(&subdev_fh->vfh);
  88         v4l2_fh_exit(&subdev_fh->vfh);
  89         subdev_fh_free(subdev_fh);
  90         kfree(subdev_fh);
  91
  92         return ret;
  93 }
  94
  95 static int subdev_close(struct file *file)
  96 {
  97         struct video_device *vdev = video_devdata(file);
  98         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  99         struct v4l2_fh *vfh = file->private_data;
 100         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 101
 102         if (sd->internal_ops && sd->internal_ops->close)
 103                 sd->internal_ops->close(sd, subdev_fh);
 104         module_put(subdev_fh->owner);
 105         v4l2_fh_del(vfh);
 106         v4l2_fh_exit(vfh);
 107         subdev_fh_free(subdev_fh);
 108         kfree(subdev_fh);
 109         file->private_data = NULL;
 110
 111         return 0;
 112 }
 113 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 114 static int subdev_open(struct file *file)
 115 {
 116         return -ENODEV;
 117 }
 118
 119 static int subdev_close(struct file *file)
 120 {
 121         return -ENODEV;
 122 }
 123 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 124
 125 static inline int check_which(u32 which)
 126 {
 127         if (which != V4L2_SUBDEV_FORMAT_TRY &&
 128             which != V4L2_SUBDEV_FORMAT_ACTIVE)
 129                 return -EINVAL;
 130
 131         return 0;
 132 }
 133
 134 static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
 135 {
 136 #if defined(CONFIG_MEDIA_CONTROLLER)
 137         if (sd->entity.num_pads) {
 138                 if (pad >= sd->entity.num_pads)
 139                         return -EINVAL;
 140                 return 0;
 141         }
 142 #endif
 143         /* allow pad 0 on subdevices not registered as media entities */
 144         if (pad > 0)
 145                 return -EINVAL;
 146         return 0;
 147 }
 148
 149 static int check_cfg(u32 which, struct v4l2_subdev_pad_config *cfg)
 150 {
 151         if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
 152                 return -EINVAL;
 153
 154         return 0;
 155 }
 156
 157 static inline int check_format(struct v4l2_subdev *sd,
 158                                struct v4l2_subdev_pad_config *cfg,
 159                                struct v4l2_subdev_format *format)
 160 {
 161         if (!format)
 162                 return -EINVAL;
 163
 164         return check_which(format->which) ? : check_pad(sd, format->pad) ? :
 165                check_cfg(format->which, cfg);
 166 }
 167
 168 static int call_get_fmt(struct v4l2_subdev *sd,
 169                         struct v4l2_subdev_pad_config *cfg,
 170                         struct v4l2_subdev_format *format)
 171 {
 172         return check_format(sd, cfg, format) ? :
 173                sd->ops->pad->get_fmt(sd, cfg, format);
 174 }
 175
 176 static int call_set_fmt(struct v4l2_subdev *sd,
 177                         struct v4l2_subdev_pad_config *cfg,
 178                         struct v4l2_subdev_format *format)
 179 {
 180         return check_format(sd, cfg, format) ? :
 181                sd->ops->pad->set_fmt(sd, cfg, format);
 182 }
 183
 184 static int call_enum_mbus_code(struct v4l2_subdev *sd,
 185                                struct v4l2_subdev_pad_config *cfg,
 186                                struct v4l2_subdev_mbus_code_enum *code)
 187 {
 188         if (!code)
 189                 return -EINVAL;
 190
 191         return check_which(code->which) ? : check_pad(sd, code->pad) ? :
 192                check_cfg(code->which, cfg) ? :
 193                sd->ops->pad->enum_mbus_code(sd, cfg, code);
 194 }
 195
 196 static int call_enum_frame_size(struct v4l2_subdev *sd,
 197                                 struct v4l2_subdev_pad_config *cfg,
 198                                 struct v4l2_subdev_frame_size_enum *fse)
 199 {
 200         if (!fse)
 201                 return -EINVAL;
 202
 203         return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
 204                check_cfg(fse->which, cfg) ? :
 205                sd->ops->pad->enum_frame_size(sd, cfg, fse);
 206 }
 207
 208 static inline int check_frame_interval(struct v4l2_subdev *sd,
 209                                        struct v4l2_subdev_frame_interval *fi)
 210 {
 211         if (!fi)
 212                 return -EINVAL;
 213
 214         return check_pad(sd, fi->pad);
 215 }
 216
 217 static int call_g_frame_interval(struct v4l2_subdev *sd,
 218                                  struct v4l2_subdev_frame_interval *fi)
 219 {
 220         return check_frame_interval(sd, fi) ? :
 221                sd->ops->video->g_frame_interval(sd, fi);
 222 }
 223
 224 static int call_s_frame_interval(struct v4l2_subdev *sd,
 225                                  struct v4l2_subdev_frame_interval *fi)
 226 {
 227         return check_frame_interval(sd, fi) ? :
 228                sd->ops->video->s_frame_interval(sd, fi);
 229 }
 230
 231 static int call_enum_frame_interval(struct v4l2_subdev *sd,
 232                                     struct v4l2_subdev_pad_config *cfg,
 233                                     struct v4l2_subdev_frame_interval_enum *fie)
 234 {
 235         if (!fie)
 236                 return -EINVAL;
 237
 238         return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
 239                check_cfg(fie->which, cfg) ? :
 240                sd->ops->pad->enum_frame_interval(sd, cfg, fie);
 241 }
 242
 243 static inline int check_selection(struct v4l2_subdev *sd,
 244                                   struct v4l2_subdev_pad_config *cfg,
 245                                   struct v4l2_subdev_selection *sel)
 246 {
 247         if (!sel)
 248                 return -EINVAL;
 249
 250         return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
 251                check_cfg(sel->which, cfg);
 252 }
 253
 254 static int call_get_selection(struct v4l2_subdev *sd,
 255                               struct v4l2_subdev_pad_config *cfg,
 256                               struct v4l2_subdev_selection *sel)
 257 {
 258         return check_selection(sd, cfg, sel) ? :
 259                sd->ops->pad->get_selection(sd, cfg, sel);
 260 }
 261
 262 static int call_set_selection(struct v4l2_subdev *sd,
 263                               struct v4l2_subdev_pad_config *cfg,
 264                               struct v4l2_subdev_selection *sel)
 265 {
 266         return check_selection(sd, cfg, sel) ? :
 267                sd->ops->pad->set_selection(sd, cfg, sel);
 268 }
 269
 270 static inline int check_edid(struct v4l2_subdev *sd,
 271                              struct v4l2_subdev_edid *edid)
 272 {
 273         if (!edid)
 274                 return -EINVAL;
 275
 276         if (edid->blocks && edid->edid == NULL)
 277                 return -EINVAL;
 278
 279         return check_pad(sd, edid->pad);
 280 }
 281
 282 static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 283 {
 284         return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
 285 }
 286
 287 static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 288 {
 289         return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
 290 }
 291
 292 static int call_dv_timings_cap(struct v4l2_subdev *sd,
 293                                struct v4l2_dv_timings_cap *cap)
 294 {
 295         if (!cap)
 296                 return -EINVAL;
 297
 298         return check_pad(sd, cap->pad) ? :
 299                sd->ops->pad->dv_timings_cap(sd, cap);
 300 }
 301
 302 static int call_enum_dv_timings(struct v4l2_subdev *sd,
 303                                 struct v4l2_enum_dv_timings *dvt)
 304 {
 305         if (!dvt)
 306                 return -EINVAL;
 307
 308         return check_pad(sd, dvt->pad) ? :
 309                sd->ops->pad->enum_dv_timings(sd, dvt);
 310 }
 311
 312 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
 313         .get_fmt                = call_get_fmt,
 314         .set_fmt                = call_set_fmt,
 315         .enum_mbus_code         = call_enum_mbus_code,
 316         .enum_frame_size        = call_enum_frame_size,
 317         .enum_frame_interval    = call_enum_frame_interval,
 318         .get_selection          = call_get_selection,
 319         .set_selection          = call_set_selection,
 320         .get_edid               = call_get_edid,
 321         .set_edid               = call_set_edid,
 322         .dv_timings_cap         = call_dv_timings_cap,
 323         .enum_dv_timings        = call_enum_dv_timings,
 324 };
 325
 326 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
 327         .g_frame_interval       = call_g_frame_interval,
 328         .s_frame_interval       = call_s_frame_interval,
 329 };
 330
 331 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
 332         .pad    = &v4l2_subdev_call_pad_wrappers,
 333         .video  = &v4l2_subdev_call_video_wrappers,
 334 };
 335 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
 336
 337 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 338 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 339 {
 340         struct video_device *vdev = video_devdata(file);
 341         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 342         struct v4l2_fh *vfh = file->private_data;
 343         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 344         bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
 345         int rval;
 346
 347         switch (cmd) {
 348         case VIDIOC_SUBDEV_QUERYCAP: {
 349                 struct v4l2_subdev_capability *cap = arg;
 350
 351                 memset(cap->reserved, 0, sizeof(cap->reserved));
 352                 cap->version = LINUX_VERSION_CODE;
 353                 cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
 354
 355                 return 0;
 356         }
 357
 358         case VIDIOC_QUERYCTRL:
 359                 /*
 360                  * TODO: this really should be folded into v4l2_queryctrl (this
 361                  * currently returns -EINVAL for NULL control handlers).
 362                  * However, v4l2_queryctrl() is still called directly by
 363                  * drivers as well and until that has been addressed I believe
 364                  * it is safer to do the check here. The same is true for the
 365                  * other control ioctls below.
 366                  */
 367                 if (!vfh->ctrl_handler)
 368                         return -ENOTTY;
 369                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 370
 371         case VIDIOC_QUERY_EXT_CTRL:
 372                 if (!vfh->ctrl_handler)
 373                         return -ENOTTY;
 374                 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
 375
 376         case VIDIOC_QUERYMENU:
 377                 if (!vfh->ctrl_handler)
 378                         return -ENOTTY;
 379                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 380
 381         case VIDIOC_G_CTRL:
 382                 if (!vfh->ctrl_handler)
 383                         return -ENOTTY;
 384                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 385
 386         case VIDIOC_S_CTRL:
 387                 if (!vfh->ctrl_handler)
 388                         return -ENOTTY;
 389                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 390
 391         case VIDIOC_G_EXT_CTRLS:
 392                 if (!vfh->ctrl_handler)
 393                         return -ENOTTY;
 394                 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
 395                                         vdev, sd->v4l2_dev->mdev, arg);
 396
 397         case VIDIOC_S_EXT_CTRLS:
 398                 if (!vfh->ctrl_handler)
 399                         return -ENOTTY;
 400                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
 401                                         vdev, sd->v4l2_dev->mdev, arg);
 402
 403         case VIDIOC_TRY_EXT_CTRLS:
 404                 if (!vfh->ctrl_handler)
 405                         return -ENOTTY;
 406                 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
 407                                           vdev, sd->v4l2_dev->mdev, arg);
 408
 409         case VIDIOC_DQEVENT:
 410                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 411                         return -ENOIOCTLCMD;
 412
 413                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 414
 415         case VIDIOC_DQEVENT_TIME32: {
 416                 struct v4l2_event_time32 *ev32 = arg;
 417                 struct v4l2_event ev = { };
 418
 419                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 420                         return -ENOIOCTLCMD;
 421
 422                 rval = v4l2_event_dequeue(vfh, &ev, file->f_flags & O_NONBLOCK);
 423
 424                 *ev32 = (struct v4l2_event_time32) {
 425                         .type           = ev.type,
 426                         .pending        = ev.pending,
 427                         .sequence       = ev.sequence,
 428                         .timestamp.tv_sec  = ev.timestamp.tv_sec,
 429                         .timestamp.tv_nsec = ev.timestamp.tv_nsec,
 430                         .id             = ev.id,
 431                 };
 432
 433                 memcpy(&ev32->u, &ev.u, sizeof(ev.u));
 434                 memcpy(&ev32->reserved, &ev.reserved, sizeof(ev.reserved));
 435
 436                 return rval;
 437         }
 438
 439         case VIDIOC_SUBSCRIBE_EVENT:
 440                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 441
 442         case VIDIOC_UNSUBSCRIBE_EVENT:
 443                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 444
 445 #ifdef CONFIG_VIDEO_ADV_DEBUG
 446         case VIDIOC_DBG_G_REGISTER:
 447         {
 448                 struct v4l2_dbg_register *p = arg;
 449
 450                 if (!capable(CAP_SYS_ADMIN))
 451                         return -EPERM;
 452                 return v4l2_subdev_call(sd, core, g_register, p);
 453         }
 454         case VIDIOC_DBG_S_REGISTER:
 455         {
 456                 struct v4l2_dbg_register *p = arg;
 457
 458                 if (!capable(CAP_SYS_ADMIN))
 459                         return -EPERM;
 460                 return v4l2_subdev_call(sd, core, s_register, p);
 461         }
 462         case VIDIOC_DBG_G_CHIP_INFO:
 463         {
 464                 struct v4l2_dbg_chip_info *p = arg;
 465
 466                 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
 467                         return -EINVAL;
 468                 if (sd->ops->core && sd->ops->core->s_register)
 469                         p->flags |= V4L2_CHIP_FL_WRITABLE;
 470                 if (sd->ops->core && sd->ops->core->g_register)
 471                         p->flags |= V4L2_CHIP_FL_READABLE;
 472                 strscpy(p->name, sd->name, sizeof(p->name));
 473                 return 0;
 474         }
 475 #endif
 476
 477         case VIDIOC_LOG_STATUS: {
 478                 int ret;
 479
 480                 pr_info("%s: =================  START STATUS  =================\n",
 481                         sd->name);
 482                 ret = v4l2_subdev_call(sd, core, log_status);
 483                 pr_info("%s: ==================  END STATUS  ==================\n",
 484                         sd->name);
 485                 return ret;
 486         }
 487
 488         case VIDIOC_SUBDEV_G_FMT: {
 489                 struct v4l2_subdev_format *format = arg;
 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, get_fmt, subdev_fh->pad, format);
 494         }
 495
 496         case VIDIOC_SUBDEV_S_FMT: {
 497                 struct v4l2_subdev_format *format = arg;
 498
 499                 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 500                         return -EPERM;
 501
 502                 memset(format->reserved, 0, sizeof(format->reserved));
 503                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 504                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
 505         }
 506
 507         case VIDIOC_SUBDEV_G_CROP: {
 508                 struct v4l2_subdev_crop *crop = arg;
 509                 struct v4l2_subdev_selection sel;
 510
 511                 memset(crop->reserved, 0, sizeof(crop->reserved));
 512                 memset(&sel, 0, sizeof(sel));
 513                 sel.which = crop->which;
 514                 sel.pad = crop->pad;
 515                 sel.target = V4L2_SEL_TGT_CROP;
 516
 517                 rval = v4l2_subdev_call(
 518                         sd, pad, get_selection, subdev_fh->pad, &sel);
 519
 520                 crop->rect = sel.r;
 521
 522                 return rval;
 523         }
 524
 525         case VIDIOC_SUBDEV_S_CROP: {
 526                 struct v4l2_subdev_crop *crop = arg;
 527                 struct v4l2_subdev_selection sel;
 528
 529                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 530                         return -EPERM;
 531
 532                 memset(crop->reserved, 0, sizeof(crop->reserved));
 533                 memset(&sel, 0, sizeof(sel));
 534                 sel.which = crop->which;
 535                 sel.pad = crop->pad;
 536                 sel.target = V4L2_SEL_TGT_CROP;
 537                 sel.r = crop->rect;
 538
 539                 rval = v4l2_subdev_call(
 540                         sd, pad, set_selection, subdev_fh->pad, &sel);
 541
 542                 crop->rect = sel.r;
 543
 544                 return rval;
 545         }
 546
 547         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 548                 struct v4l2_subdev_mbus_code_enum *code = arg;
 549
 550                 memset(code->reserved, 0, sizeof(code->reserved));
 551                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
 552                                         code);
 553         }
 554
 555         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 556                 struct v4l2_subdev_frame_size_enum *fse = arg;
 557
 558                 memset(fse->reserved, 0, sizeof(fse->reserved));
 559                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
 560                                         fse);
 561         }
 562
 563         case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
 564                 struct v4l2_subdev_frame_interval *fi = arg;
 565
 566                 memset(fi->reserved, 0, sizeof(fi->reserved));
 567                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 568         }
 569
 570         case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
 571                 struct v4l2_subdev_frame_interval *fi = arg;
 572
 573                 if (ro_subdev)
 574                         return -EPERM;
 575
 576                 memset(fi->reserved, 0, sizeof(fi->reserved));
 577                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 578         }
 579
 580         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 581                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 582
 583                 memset(fie->reserved, 0, sizeof(fie->reserved));
 584                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
 585                                         fie);
 586         }
 587
 588         case VIDIOC_SUBDEV_G_SELECTION: {
 589                 struct v4l2_subdev_selection *sel = arg;
 590
 591                 memset(sel->reserved, 0, sizeof(sel->reserved));
 592                 return v4l2_subdev_call(
 593                         sd, pad, get_selection, subdev_fh->pad, sel);
 594         }
 595
 596         case VIDIOC_SUBDEV_S_SELECTION: {
 597                 struct v4l2_subdev_selection *sel = arg;
 598
 599                 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 600                         return -EPERM;
 601
 602                 memset(sel->reserved, 0, sizeof(sel->reserved));
 603                 return v4l2_subdev_call(
 604                         sd, pad, set_selection, subdev_fh->pad, sel);
 605         }
 606
 607         case VIDIOC_G_EDID: {
 608                 struct v4l2_subdev_edid *edid = arg;
 609
 610                 return v4l2_subdev_call(sd, pad, get_edid, edid);
 611         }
 612
 613         case VIDIOC_S_EDID: {
 614                 struct v4l2_subdev_edid *edid = arg;
 615
 616                 return v4l2_subdev_call(sd, pad, set_edid, edid);
 617         }
 618
 619         case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
 620                 struct v4l2_dv_timings_cap *cap = arg;
 621
 622                 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
 623         }
 624
 625         case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
 626                 struct v4l2_enum_dv_timings *dvt = arg;
 627
 628                 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
 629         }
 630
 631         case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
 632                 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
 633
 634         case VIDIOC_SUBDEV_G_DV_TIMINGS:
 635                 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
 636
 637         case VIDIOC_SUBDEV_S_DV_TIMINGS:
 638                 if (ro_subdev)
 639                         return -EPERM;
 640
 641                 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
 642
 643         case VIDIOC_SUBDEV_G_STD:
 644                 return v4l2_subdev_call(sd, video, g_std, arg);
 645
 646         case VIDIOC_SUBDEV_S_STD: {
 647                 v4l2_std_id *std = arg;
 648
 649                 if (ro_subdev)
 650                         return -EPERM;
 651
 652                 return v4l2_subdev_call(sd, video, s_std, *std);
 653         }
 654
 655         case VIDIOC_SUBDEV_ENUMSTD: {
 656                 struct v4l2_standard *p = arg;
 657                 v4l2_std_id id;
 658
 659                 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
 660                         return -EINVAL;
 661
 662                 return v4l_video_std_enumstd(p, id);
 663         }
 664
 665         case VIDIOC_SUBDEV_QUERYSTD:
 666                 return v4l2_subdev_call(sd, video, querystd, arg);
 667
 668         default:
 669                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 670         }
 671
 672         return 0;
 673 }
 674
 675 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
 676 {
 677         struct video_device *vdev = video_devdata(file);
 678         struct mutex *lock = vdev->lock;
 679         long ret = -ENODEV;
 680
 681         if (lock && mutex_lock_interruptible(lock))
 682                 return -ERESTARTSYS;
 683         if (video_is_registered(vdev))
 684                 ret = subdev_do_ioctl(file, cmd, arg);
 685         if (lock)
 686                 mutex_unlock(lock);
 687         return ret;
 688 }
 689
 690 static long subdev_ioctl(struct file *file, unsigned int cmd,
 691         unsigned long arg)
 692 {
 693         return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
 694 }
 695
 696 #ifdef CONFIG_COMPAT
 697 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 698         unsigned long arg)
 699 {
 700         struct video_device *vdev = video_devdata(file);
 701         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 702
 703         return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
 704 }
 705 #endif
 706
 707 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 708 static long subdev_ioctl(struct file *file, unsigned int cmd,
 709                          unsigned long arg)
 710 {
 711         return -ENODEV;
 712 }
 713
 714 #ifdef CONFIG_COMPAT
 715 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 716                                   unsigned long arg)
 717 {
 718         return -ENODEV;
 719 }
 720 #endif
 721 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 722
 723 static __poll_t subdev_poll(struct file *file, poll_table *wait)
 724 {
 725         struct video_device *vdev = video_devdata(file);
 726         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 727         struct v4l2_fh *fh = file->private_data;
 728
 729         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 730                 return EPOLLERR;
 731
 732         poll_wait(file, &fh->wait, wait);
 733
 734         if (v4l2_event_pending(fh))
 735                 return EPOLLPRI;
 736
 737         return 0;
 738 }
 739
 740 const struct v4l2_file_operations v4l2_subdev_fops = {
 741         .owner = THIS_MODULE,
 742         .open = subdev_open,
 743         .unlocked_ioctl = subdev_ioctl,
 744 #ifdef CONFIG_COMPAT
 745         .compat_ioctl32 = subdev_compat_ioctl32,
 746 #endif
 747         .release = subdev_close,
 748         .poll = subdev_poll,
 749 };
 750
 751 #ifdef CONFIG_MEDIA_CONTROLLER
 752
 753 int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
 754                                       struct fwnode_endpoint *endpoint)
 755 {
 756         struct fwnode_handle *fwnode;
 757         struct v4l2_subdev *sd;
 758
 759         if (!is_media_entity_v4l2_subdev(entity))
 760                 return -EINVAL;
 761
 762         sd = media_entity_to_v4l2_subdev(entity);
 763
 764         fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
 765         fwnode_handle_put(fwnode);
 766
 767         if (dev_fwnode(sd->dev) == fwnode)
 768                 return endpoint->port;
 769
 770         return -ENXIO;
 771 }
 772 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
 773
 774 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
 775                                       struct media_link *link,
 776                                       struct v4l2_subdev_format *source_fmt,
 777                                       struct v4l2_subdev_format *sink_fmt)
 778 {
 779         /* The width, height and code must match. */
 780         if (source_fmt->format.width != sink_fmt->format.width
 781             || source_fmt->format.height != sink_fmt->format.height
 782             || source_fmt->format.code != sink_fmt->format.code)
 783                 return -EPIPE;
 784
 785         /* The field order must match, or the sink field order must be NONE
 786          * to support interlaced hardware connected to bridges that support
 787          * progressive formats only.
 788          */
 789         if (source_fmt->format.field != sink_fmt->format.field &&
 790             sink_fmt->format.field != V4L2_FIELD_NONE)
 791                 return -EPIPE;
 792
 793         return 0;
 794 }
 795 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
 796
 797 static int
 798 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
 799                                      struct v4l2_subdev_format *fmt)
 800 {
 801         if (is_media_entity_v4l2_subdev(pad->entity)) {
 802                 struct v4l2_subdev *sd =
 803                         media_entity_to_v4l2_subdev(pad->entity);
 804
 805                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
 806                 fmt->pad = pad->index;
 807                 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
 808         }
 809
 810         WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
 811              "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
 812              pad->entity->function, pad->entity->name);
 813
 814         return -EINVAL;
 815 }
 816
 817 int v4l2_subdev_link_validate(struct media_link *link)
 818 {
 819         struct v4l2_subdev *sink;
 820         struct v4l2_subdev_format sink_fmt, source_fmt;
 821         int rval;
 822
 823         rval = v4l2_subdev_link_validate_get_format(
 824                 link->source, &source_fmt);
 825         if (rval < 0)
 826                 return 0;
 827
 828         rval = v4l2_subdev_link_validate_get_format(
 829                 link->sink, &sink_fmt);
 830         if (rval < 0)
 831                 return 0;
 832
 833         sink = media_entity_to_v4l2_subdev(link->sink->entity);
 834
 835         rval = v4l2_subdev_call(sink, pad, link_validate, link,
 836                                 &source_fmt, &sink_fmt);
 837         if (rval != -ENOIOCTLCMD)
 838                 return rval;
 839
 840         return v4l2_subdev_link_validate_default(
 841                 sink, link, &source_fmt, &sink_fmt);
 842 }
 843 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
 844
 845 struct v4l2_subdev_pad_config *
 846 v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
 847 {
 848         struct v4l2_subdev_pad_config *cfg;
 849         int ret;
 850
 851         if (!sd->entity.num_pads)
 852                 return NULL;
 853
 854         cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
 855                              GFP_KERNEL | __GFP_ZERO);
 856         if (!cfg)
 857                 return NULL;
 858
 859         ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
 860         if (ret < 0 && ret != -ENOIOCTLCMD) {
 861                 kvfree(cfg);
 862                 return NULL;
 863         }
 864
 865         return cfg;
 866 }
 867 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
 868
 869 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
 870 {
 871         kvfree(cfg);
 872 }
 873 EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
 874 #endif /* CONFIG_MEDIA_CONTROLLER */
 875
 876 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 877 {
 878         INIT_LIST_HEAD(&sd->list);
 879         BUG_ON(!ops);
 880         sd->ops = ops;
 881         sd->v4l2_dev = NULL;
 882         sd->flags = 0;
 883         sd->name[0] = '\0';
 884         sd->grp_id = 0;
 885         sd->dev_priv = NULL;
 886         sd->host_priv = NULL;
 887 #if defined(CONFIG_MEDIA_CONTROLLER)
 888         sd->entity.name = sd->name;
 889         sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
 890         sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 891 #endif
 892 }
 893 EXPORT_SYMBOL(v4l2_subdev_init);
 894
 895 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 896                               const struct v4l2_event *ev)
 897 {
 898         v4l2_event_queue(sd->devnode, ev);
 899         v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
 900 }
 901 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);