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 int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
 313                                 struct v4l2_mbus_config *config)
 314 {
 315         return check_pad(sd, pad) ? :
 316                sd->ops->pad->get_mbus_config(sd, pad, config);
 317 }
 318
 319 static int call_set_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
 320                                 struct v4l2_mbus_config *config)
 321 {
 322         return check_pad(sd, pad) ? :
 323                sd->ops->pad->get_mbus_config(sd, pad, config);
 324 }
 325
 326 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
 327         .get_fmt                = call_get_fmt,
 328         .set_fmt                = call_set_fmt,
 329         .enum_mbus_code         = call_enum_mbus_code,
 330         .enum_frame_size        = call_enum_frame_size,
 331         .enum_frame_interval    = call_enum_frame_interval,
 332         .get_selection          = call_get_selection,
 333         .set_selection          = call_set_selection,
 334         .get_edid               = call_get_edid,
 335         .set_edid               = call_set_edid,
 336         .dv_timings_cap         = call_dv_timings_cap,
 337         .enum_dv_timings        = call_enum_dv_timings,
 338         .get_mbus_config        = call_get_mbus_config,
 339         .set_mbus_config        = call_set_mbus_config,
 340 };
 341
 342 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
 343         .g_frame_interval       = call_g_frame_interval,
 344         .s_frame_interval       = call_s_frame_interval,
 345 };
 346
 347 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
 348         .pad    = &v4l2_subdev_call_pad_wrappers,
 349         .video  = &v4l2_subdev_call_video_wrappers,
 350 };
 351 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
 352
 353 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 354 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 355 {
 356         struct video_device *vdev = video_devdata(file);
 357         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 358         struct v4l2_fh *vfh = file->private_data;
 359         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 360         bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
 361         int rval;
 362
 363         switch (cmd) {
 364         case VIDIOC_SUBDEV_QUERYCAP: {
 365                 struct v4l2_subdev_capability *cap = arg;
 366
 367                 memset(cap->reserved, 0, sizeof(cap->reserved));
 368                 cap->version = LINUX_VERSION_CODE;
 369                 cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
 370
 371                 return 0;
 372         }
 373
 374         case VIDIOC_QUERYCTRL:
 375                 /*
 376                  * TODO: this really should be folded into v4l2_queryctrl (this
 377                  * currently returns -EINVAL for NULL control handlers).
 378                  * However, v4l2_queryctrl() is still called directly by
 379                  * drivers as well and until that has been addressed I believe
 380                  * it is safer to do the check here. The same is true for the
 381                  * other control ioctls below.
 382                  */
 383                 if (!vfh->ctrl_handler)
 384                         return -ENOTTY;
 385                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 386
 387         case VIDIOC_QUERY_EXT_CTRL:
 388                 if (!vfh->ctrl_handler)
 389                         return -ENOTTY;
 390                 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
 391
 392         case VIDIOC_QUERYMENU:
 393                 if (!vfh->ctrl_handler)
 394                         return -ENOTTY;
 395                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 396
 397         case VIDIOC_G_CTRL:
 398                 if (!vfh->ctrl_handler)
 399                         return -ENOTTY;
 400                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 401
 402         case VIDIOC_S_CTRL:
 403                 if (!vfh->ctrl_handler)
 404                         return -ENOTTY;
 405                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 406
 407         case VIDIOC_G_EXT_CTRLS:
 408                 if (!vfh->ctrl_handler)
 409                         return -ENOTTY;
 410                 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
 411                                         vdev, sd->v4l2_dev->mdev, arg);
 412
 413         case VIDIOC_S_EXT_CTRLS:
 414                 if (!vfh->ctrl_handler)
 415                         return -ENOTTY;
 416                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
 417                                         vdev, sd->v4l2_dev->mdev, arg);
 418
 419         case VIDIOC_TRY_EXT_CTRLS:
 420                 if (!vfh->ctrl_handler)
 421                         return -ENOTTY;
 422                 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
 423                                           vdev, sd->v4l2_dev->mdev, arg);
 424
 425         case VIDIOC_DQEVENT:
 426                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 427                         return -ENOIOCTLCMD;
 428
 429                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 430
 431         case VIDIOC_DQEVENT_TIME32: {
 432                 struct v4l2_event_time32 *ev32 = arg;
 433                 struct v4l2_event ev = { };
 434
 435                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 436                         return -ENOIOCTLCMD;
 437
 438                 rval = v4l2_event_dequeue(vfh, &ev, file->f_flags & O_NONBLOCK);
 439
 440                 *ev32 = (struct v4l2_event_time32) {
 441                         .type           = ev.type,
 442                         .pending        = ev.pending,
 443                         .sequence       = ev.sequence,
 444                         .timestamp.tv_sec  = ev.timestamp.tv_sec,
 445                         .timestamp.tv_nsec = ev.timestamp.tv_nsec,
 446                         .id             = ev.id,
 447                 };
 448
 449                 memcpy(&ev32->u, &ev.u, sizeof(ev.u));
 450                 memcpy(&ev32->reserved, &ev.reserved, sizeof(ev.reserved));
 451
 452                 return rval;
 453         }
 454
 455         case VIDIOC_SUBSCRIBE_EVENT:
 456                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 457
 458         case VIDIOC_UNSUBSCRIBE_EVENT:
 459                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 460
 461 #ifdef CONFIG_VIDEO_ADV_DEBUG
 462         case VIDIOC_DBG_G_REGISTER:
 463         {
 464                 struct v4l2_dbg_register *p = arg;
 465
 466                 if (!capable(CAP_SYS_ADMIN))
 467                         return -EPERM;
 468                 return v4l2_subdev_call(sd, core, g_register, p);
 469         }
 470         case VIDIOC_DBG_S_REGISTER:
 471         {
 472                 struct v4l2_dbg_register *p = arg;
 473
 474                 if (!capable(CAP_SYS_ADMIN))
 475                         return -EPERM;
 476                 return v4l2_subdev_call(sd, core, s_register, p);
 477         }
 478         case VIDIOC_DBG_G_CHIP_INFO:
 479         {
 480                 struct v4l2_dbg_chip_info *p = arg;
 481
 482                 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
 483                         return -EINVAL;
 484                 if (sd->ops->core && sd->ops->core->s_register)
 485                         p->flags |= V4L2_CHIP_FL_WRITABLE;
 486                 if (sd->ops->core && sd->ops->core->g_register)
 487                         p->flags |= V4L2_CHIP_FL_READABLE;
 488                 strscpy(p->name, sd->name, sizeof(p->name));
 489                 return 0;
 490         }
 491 #endif
 492
 493         case VIDIOC_LOG_STATUS: {
 494                 int ret;
 495
 496                 pr_info("%s: =================  START STATUS  =================\n",
 497                         sd->name);
 498                 ret = v4l2_subdev_call(sd, core, log_status);
 499                 pr_info("%s: ==================  END STATUS  ==================\n",
 500                         sd->name);
 501                 return ret;
 502         }
 503
 504         case VIDIOC_SUBDEV_G_FMT: {
 505                 struct v4l2_subdev_format *format = arg;
 506
 507                 memset(format->reserved, 0, sizeof(format->reserved));
 508                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 509                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
 510         }
 511
 512         case VIDIOC_SUBDEV_S_FMT: {
 513                 struct v4l2_subdev_format *format = arg;
 514
 515                 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 516                         return -EPERM;
 517
 518                 memset(format->reserved, 0, sizeof(format->reserved));
 519                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 520                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
 521         }
 522
 523         case VIDIOC_SUBDEV_G_CROP: {
 524                 struct v4l2_subdev_crop *crop = arg;
 525                 struct v4l2_subdev_selection sel;
 526
 527                 memset(crop->reserved, 0, sizeof(crop->reserved));
 528                 memset(&sel, 0, sizeof(sel));
 529                 sel.which = crop->which;
 530                 sel.pad = crop->pad;
 531                 sel.target = V4L2_SEL_TGT_CROP;
 532
 533                 rval = v4l2_subdev_call(
 534                         sd, pad, get_selection, subdev_fh->pad, &sel);
 535
 536                 crop->rect = sel.r;
 537
 538                 return rval;
 539         }
 540
 541         case VIDIOC_SUBDEV_S_CROP: {
 542                 struct v4l2_subdev_crop *crop = arg;
 543                 struct v4l2_subdev_selection sel;
 544
 545                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 546                         return -EPERM;
 547
 548                 memset(crop->reserved, 0, sizeof(crop->reserved));
 549                 memset(&sel, 0, sizeof(sel));
 550                 sel.which = crop->which;
 551                 sel.pad = crop->pad;
 552                 sel.target = V4L2_SEL_TGT_CROP;
 553                 sel.r = crop->rect;
 554
 555                 rval = v4l2_subdev_call(
 556                         sd, pad, set_selection, subdev_fh->pad, &sel);
 557
 558                 crop->rect = sel.r;
 559
 560                 return rval;
 561         }
 562
 563         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 564                 struct v4l2_subdev_mbus_code_enum *code = arg;
 565
 566                 memset(code->reserved, 0, sizeof(code->reserved));
 567                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
 568                                         code);
 569         }
 570
 571         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 572                 struct v4l2_subdev_frame_size_enum *fse = arg;
 573
 574                 memset(fse->reserved, 0, sizeof(fse->reserved));
 575                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
 576                                         fse);
 577         }
 578
 579         case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
 580                 struct v4l2_subdev_frame_interval *fi = arg;
 581
 582                 memset(fi->reserved, 0, sizeof(fi->reserved));
 583                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 584         }
 585
 586         case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
 587                 struct v4l2_subdev_frame_interval *fi = arg;
 588
 589                 if (ro_subdev)
 590                         return -EPERM;
 591
 592                 memset(fi->reserved, 0, sizeof(fi->reserved));
 593                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 594         }
 595
 596         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 597                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 598
 599                 memset(fie->reserved, 0, sizeof(fie->reserved));
 600                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
 601                                         fie);
 602         }
 603
 604         case VIDIOC_SUBDEV_G_SELECTION: {
 605                 struct v4l2_subdev_selection *sel = arg;
 606
 607                 memset(sel->reserved, 0, sizeof(sel->reserved));
 608                 return v4l2_subdev_call(
 609                         sd, pad, get_selection, subdev_fh->pad, sel);
 610         }
 611
 612         case VIDIOC_SUBDEV_S_SELECTION: {
 613                 struct v4l2_subdev_selection *sel = arg;
 614
 615                 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 616                         return -EPERM;
 617
 618                 memset(sel->reserved, 0, sizeof(sel->reserved));
 619                 return v4l2_subdev_call(
 620                         sd, pad, set_selection, subdev_fh->pad, sel);
 621         }
 622
 623         case VIDIOC_G_EDID: {
 624                 struct v4l2_subdev_edid *edid = arg;
 625
 626                 return v4l2_subdev_call(sd, pad, get_edid, edid);
 627         }
 628
 629         case VIDIOC_S_EDID: {
 630                 struct v4l2_subdev_edid *edid = arg;
 631
 632                 return v4l2_subdev_call(sd, pad, set_edid, edid);
 633         }
 634
 635         case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
 636                 struct v4l2_dv_timings_cap *cap = arg;
 637
 638                 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
 639         }
 640
 641         case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
 642                 struct v4l2_enum_dv_timings *dvt = arg;
 643
 644                 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
 645         }
 646
 647         case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
 648                 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
 649
 650         case VIDIOC_SUBDEV_G_DV_TIMINGS:
 651                 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
 652
 653         case VIDIOC_SUBDEV_S_DV_TIMINGS:
 654                 if (ro_subdev)
 655                         return -EPERM;
 656
 657                 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
 658
 659         case VIDIOC_SUBDEV_G_STD:
 660                 return v4l2_subdev_call(sd, video, g_std, arg);
 661
 662         case VIDIOC_SUBDEV_S_STD: {
 663                 v4l2_std_id *std = arg;
 664
 665                 if (ro_subdev)
 666                         return -EPERM;
 667
 668                 return v4l2_subdev_call(sd, video, s_std, *std);
 669         }
 670
 671         case VIDIOC_SUBDEV_ENUMSTD: {
 672                 struct v4l2_standard *p = arg;
 673                 v4l2_std_id id;
 674
 675                 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
 676                         return -EINVAL;
 677
 678                 return v4l_video_std_enumstd(p, id);
 679         }
 680
 681         case VIDIOC_SUBDEV_QUERYSTD:
 682                 return v4l2_subdev_call(sd, video, querystd, arg);
 683
 684         default:
 685                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 686         }
 687
 688         return 0;
 689 }
 690
 691 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
 692 {
 693         struct video_device *vdev = video_devdata(file);
 694         struct mutex *lock = vdev->lock;
 695         long ret = -ENODEV;
 696
 697         if (lock && mutex_lock_interruptible(lock))
 698                 return -ERESTARTSYS;
 699         if (video_is_registered(vdev))
 700                 ret = subdev_do_ioctl(file, cmd, arg);
 701         if (lock)
 702                 mutex_unlock(lock);
 703         return ret;
 704 }
 705
 706 static long subdev_ioctl(struct file *file, unsigned int cmd,
 707         unsigned long arg)
 708 {
 709         return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
 710 }
 711
 712 #ifdef CONFIG_COMPAT
 713 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 714         unsigned long arg)
 715 {
 716         struct video_device *vdev = video_devdata(file);
 717         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 718
 719         return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
 720 }
 721 #endif
 722
 723 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 724 static long subdev_ioctl(struct file *file, unsigned int cmd,
 725                          unsigned long arg)
 726 {
 727         return -ENODEV;
 728 }
 729
 730 #ifdef CONFIG_COMPAT
 731 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 732                                   unsigned long arg)
 733 {
 734         return -ENODEV;
 735 }
 736 #endif
 737 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 738
 739 static __poll_t subdev_poll(struct file *file, poll_table *wait)
 740 {
 741         struct video_device *vdev = video_devdata(file);
 742         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 743         struct v4l2_fh *fh = file->private_data;
 744
 745         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 746                 return EPOLLERR;
 747
 748         poll_wait(file, &fh->wait, wait);
 749
 750         if (v4l2_event_pending(fh))
 751                 return EPOLLPRI;
 752
 753         return 0;
 754 }
 755
 756 const struct v4l2_file_operations v4l2_subdev_fops = {
 757         .owner = THIS_MODULE,
 758         .open = subdev_open,
 759         .unlocked_ioctl = subdev_ioctl,
 760 #ifdef CONFIG_COMPAT
 761         .compat_ioctl32 = subdev_compat_ioctl32,
 762 #endif
 763         .release = subdev_close,
 764         .poll = subdev_poll,
 765 };
 766
 767 #ifdef CONFIG_MEDIA_CONTROLLER
 768
 769 int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
 770                                       struct fwnode_endpoint *endpoint)
 771 {
 772         struct fwnode_handle *fwnode;
 773         struct v4l2_subdev *sd;
 774
 775         if (!is_media_entity_v4l2_subdev(entity))
 776                 return -EINVAL;
 777
 778         sd = media_entity_to_v4l2_subdev(entity);
 779
 780         fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
 781         fwnode_handle_put(fwnode);
 782
 783         if (dev_fwnode(sd->dev) == fwnode)
 784                 return endpoint->port;
 785
 786         return -ENXIO;
 787 }
 788 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
 789
 790 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
 791                                       struct media_link *link,
 792                                       struct v4l2_subdev_format *source_fmt,
 793                                       struct v4l2_subdev_format *sink_fmt)
 794 {
 795         bool pass = true;
 796
 797         /* The width, height and code must match. */
 798         if (source_fmt->format.width != sink_fmt->format.width) {
 799                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 800                         "%s: width does not match (source %u, sink %u)\n",
 801                         __func__,
 802                         source_fmt->format.width, sink_fmt->format.width);
 803                 pass = false;
 804         }
 805
 806         if (source_fmt->format.height != sink_fmt->format.height) {
 807                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 808                         "%s: height does not match (source %u, sink %u)\n",
 809                         __func__,
 810                         source_fmt->format.height, sink_fmt->format.height);
 811                 pass = false;
 812         }
 813
 814         if (source_fmt->format.code != sink_fmt->format.code) {
 815                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 816                         "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n",
 817                         __func__,
 818                         source_fmt->format.code, sink_fmt->format.code);
 819                 pass = false;
 820         }
 821
 822         /* The field order must match, or the sink field order must be NONE
 823          * to support interlaced hardware connected to bridges that support
 824          * progressive formats only.
 825          */
 826         if (source_fmt->format.field != sink_fmt->format.field &&
 827             sink_fmt->format.field != V4L2_FIELD_NONE) {
 828                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 829                         "%s: field does not match (source %u, sink %u)\n",
 830                         __func__,
 831                         source_fmt->format.field, sink_fmt->format.field);
 832                 pass = false;
 833         }
 834
 835         if (pass)
 836                 return 0;
 837
 838         dev_dbg(sd->entity.graph_obj.mdev->dev,
 839                 "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__,
 840                 link->source->entity->name, link->source->index,
 841                 link->sink->entity->name, link->sink->index);
 842
 843         return -EPIPE;
 844 }
 845 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
 846
 847 static int
 848 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
 849                                      struct v4l2_subdev_format *fmt)
 850 {
 851         if (is_media_entity_v4l2_subdev(pad->entity)) {
 852                 struct v4l2_subdev *sd =
 853                         media_entity_to_v4l2_subdev(pad->entity);
 854
 855                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
 856                 fmt->pad = pad->index;
 857                 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
 858         }
 859
 860         WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
 861              "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
 862              pad->entity->function, pad->entity->name);
 863
 864         return -EINVAL;
 865 }
 866
 867 int v4l2_subdev_link_validate(struct media_link *link)
 868 {
 869         struct v4l2_subdev *sink;
 870         struct v4l2_subdev_format sink_fmt, source_fmt;
 871         int rval;
 872
 873         rval = v4l2_subdev_link_validate_get_format(
 874                 link->source, &source_fmt);
 875         if (rval < 0)
 876                 return 0;
 877
 878         rval = v4l2_subdev_link_validate_get_format(
 879                 link->sink, &sink_fmt);
 880         if (rval < 0)
 881                 return 0;
 882
 883         sink = media_entity_to_v4l2_subdev(link->sink->entity);
 884
 885         rval = v4l2_subdev_call(sink, pad, link_validate, link,
 886                                 &source_fmt, &sink_fmt);
 887         if (rval != -ENOIOCTLCMD)
 888                 return rval;
 889
 890         return v4l2_subdev_link_validate_default(
 891                 sink, link, &source_fmt, &sink_fmt);
 892 }
 893 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
 894
 895 struct v4l2_subdev_pad_config *
 896 v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
 897 {
 898         struct v4l2_subdev_pad_config *cfg;
 899         int ret;
 900
 901         if (!sd->entity.num_pads)
 902                 return NULL;
 903
 904         cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
 905                              GFP_KERNEL | __GFP_ZERO);
 906         if (!cfg)
 907                 return NULL;
 908
 909         ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
 910         if (ret < 0 && ret != -ENOIOCTLCMD) {
 911                 kvfree(cfg);
 912                 return NULL;
 913         }
 914
 915         return cfg;
 916 }
 917 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
 918
 919 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
 920 {
 921         kvfree(cfg);
 922 }
 923 EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
 924 #endif /* CONFIG_MEDIA_CONTROLLER */
 925
 926 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 927 {
 928         INIT_LIST_HEAD(&sd->list);
 929         BUG_ON(!ops);
 930         sd->ops = ops;
 931         sd->v4l2_dev = NULL;
 932         sd->flags = 0;
 933         sd->name[0] = '\0';
 934         sd->grp_id = 0;
 935         sd->dev_priv = NULL;
 936         sd->host_priv = NULL;
 937 #if defined(CONFIG_MEDIA_CONTROLLER)
 938         sd->entity.name = sd->name;
 939         sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
 940         sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 941 #endif
 942 }
 943 EXPORT_SYMBOL(v4l2_subdev_init);
 944
 945 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 946                               const struct v4l2_event *ev)
 947 {
 948         v4l2_event_queue(sd->devnode, ev);
 949         v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
 950 }
 951 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);