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

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