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