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

   1 /*
   2  * V4L2 sub-device
   3  *
   4  * Copyright (C) 2010 Nokia Corporation
   5  *
   6  * Contact: Laurent Pinchart <[email protected]>
   7  *          Sakari Ailus <[email protected]>
   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/slab.h>
  21 #include <linux/types.h>
  22 #include <linux/videodev2.h>
  23 #include <linux/export.h>
  24
  25 #include <media/v4l2-ctrls.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-ioctl.h>
  28 #include <media/v4l2-fh.h>
  29 #include <media/v4l2-event.h>
  30
  31 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
  32 {
  33 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  34         if (sd->entity.num_pads) {
  35                 fh->pad = v4l2_subdev_alloc_pad_config(sd);
  36                 if (fh->pad == NULL)
  37                         return -ENOMEM;
  38         }
  39 #endif
  40         return 0;
  41 }
  42
  43 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
  44 {
  45 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  46         v4l2_subdev_free_pad_config(fh->pad);
  47         fh->pad = NULL;
  48 #endif
  49 }
  50
  51 static int subdev_open(struct file *file)
  52 {
  53         struct video_device *vdev = video_devdata(file);
  54         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  55         struct v4l2_subdev_fh *subdev_fh;
  56 #if defined(CONFIG_MEDIA_CONTROLLER)
  57         struct media_entity *entity = NULL;
  58 #endif
  59         int ret;
  60
  61         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
  62         if (subdev_fh == NULL)
  63                 return -ENOMEM;
  64
  65         ret = subdev_fh_init(subdev_fh, sd);
  66         if (ret) {
  67                 kfree(subdev_fh);
  68                 return ret;
  69         }
  70
  71         v4l2_fh_init(&subdev_fh->vfh, vdev);
  72         v4l2_fh_add(&subdev_fh->vfh);
  73         file->private_data = &subdev_fh->vfh;
  74 #if defined(CONFIG_MEDIA_CONTROLLER)
  75         if (sd->v4l2_dev->mdev) {
  76                 entity = media_entity_get(&sd->entity);
  77                 if (!entity) {
  78                         ret = -EBUSY;
  79                         goto err;
  80                 }
  81         }
  82 #endif
  83
  84         if (sd->internal_ops && sd->internal_ops->open) {
  85                 ret = sd->internal_ops->open(sd, subdev_fh);
  86                 if (ret < 0)
  87                         goto err;
  88         }
  89
  90         return 0;
  91
  92 err:
  93 #if defined(CONFIG_MEDIA_CONTROLLER)
  94         media_entity_put(entity);
  95 #endif
  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 #if defined(CONFIG_MEDIA_CONTROLLER)
 114         if (sd->v4l2_dev->mdev)
 115                 media_entity_put(&sd->entity);
 116 #endif
 117         v4l2_fh_del(vfh);
 118         v4l2_fh_exit(vfh);
 119         subdev_fh_free(subdev_fh);
 120         kfree(subdev_fh);
 121         file->private_data = NULL;
 122
 123         return 0;
 124 }
 125
 126 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 127 static int check_format(struct v4l2_subdev *sd,
 128                         struct v4l2_subdev_format *format)
 129 {
 130         if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 131             format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 132                 return -EINVAL;
 133
 134         if (format->pad >= sd->entity.num_pads)
 135                 return -EINVAL;
 136
 137         return 0;
 138 }
 139
 140 static int check_crop(struct v4l2_subdev *sd, struct v4l2_subdev_crop *crop)
 141 {
 142         if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 143             crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 144                 return -EINVAL;
 145
 146         if (crop->pad >= sd->entity.num_pads)
 147                 return -EINVAL;
 148
 149         return 0;
 150 }
 151
 152 static int check_selection(struct v4l2_subdev *sd,
 153                            struct v4l2_subdev_selection *sel)
 154 {
 155         if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
 156             sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 157                 return -EINVAL;
 158
 159         if (sel->pad >= sd->entity.num_pads)
 160                 return -EINVAL;
 161
 162         return 0;
 163 }
 164
 165 static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 166 {
 167         if (edid->pad >= sd->entity.num_pads)
 168                 return -EINVAL;
 169
 170         if (edid->blocks && edid->edid == NULL)
 171                 return -EINVAL;
 172
 173         return 0;
 174 }
 175 #endif
 176
 177 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 178 {
 179         struct video_device *vdev = video_devdata(file);
 180         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 181         struct v4l2_fh *vfh = file->private_data;
 182 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 183         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 184         int rval;
 185 #endif
 186
 187         switch (cmd) {
 188         case VIDIOC_QUERYCTRL:
 189                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 190
 191         case VIDIOC_QUERY_EXT_CTRL:
 192                 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
 193
 194         case VIDIOC_QUERYMENU:
 195                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 196
 197         case VIDIOC_G_CTRL:
 198                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 199
 200         case VIDIOC_S_CTRL:
 201                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 202
 203         case VIDIOC_G_EXT_CTRLS:
 204                 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
 205
 206         case VIDIOC_S_EXT_CTRLS:
 207                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
 208
 209         case VIDIOC_TRY_EXT_CTRLS:
 210                 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
 211
 212         case VIDIOC_DQEVENT:
 213                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 214                         return -ENOIOCTLCMD;
 215
 216                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 217
 218         case VIDIOC_SUBSCRIBE_EVENT:
 219                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 220
 221         case VIDIOC_UNSUBSCRIBE_EVENT:
 222                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 223
 224 #ifdef CONFIG_VIDEO_ADV_DEBUG
 225         case VIDIOC_DBG_G_REGISTER:
 226         {
 227                 struct v4l2_dbg_register *p = arg;
 228
 229                 if (!capable(CAP_SYS_ADMIN))
 230                         return -EPERM;
 231                 return v4l2_subdev_call(sd, core, g_register, p);
 232         }
 233         case VIDIOC_DBG_S_REGISTER:
 234         {
 235                 struct v4l2_dbg_register *p = arg;
 236
 237                 if (!capable(CAP_SYS_ADMIN))
 238                         return -EPERM;
 239                 return v4l2_subdev_call(sd, core, s_register, p);
 240         }
 241 #endif
 242
 243         case VIDIOC_LOG_STATUS: {
 244                 int ret;
 245
 246                 pr_info("%s: =================  START STATUS  =================\n",
 247                         sd->name);
 248                 ret = v4l2_subdev_call(sd, core, log_status);
 249                 pr_info("%s: ==================  END STATUS  ==================\n",
 250                         sd->name);
 251                 return ret;
 252         }
 253
 254 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 255         case VIDIOC_SUBDEV_G_FMT: {
 256                 struct v4l2_subdev_format *format = arg;
 257
 258                 rval = check_format(sd, format);
 259                 if (rval)
 260                         return rval;
 261
 262                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
 263         }
 264
 265         case VIDIOC_SUBDEV_S_FMT: {
 266                 struct v4l2_subdev_format *format = arg;
 267
 268                 rval = check_format(sd, format);
 269                 if (rval)
 270                         return rval;
 271
 272                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
 273         }
 274
 275         case VIDIOC_SUBDEV_G_CROP: {
 276                 struct v4l2_subdev_crop *crop = arg;
 277                 struct v4l2_subdev_selection sel;
 278
 279                 rval = check_crop(sd, crop);
 280                 if (rval)
 281                         return rval;
 282
 283                 memset(&sel, 0, sizeof(sel));
 284                 sel.which = crop->which;
 285                 sel.pad = crop->pad;
 286                 sel.target = V4L2_SEL_TGT_CROP;
 287
 288                 rval = v4l2_subdev_call(
 289                         sd, pad, get_selection, subdev_fh->pad, &sel);
 290
 291                 crop->rect = sel.r;
 292
 293                 return rval;
 294         }
 295
 296         case VIDIOC_SUBDEV_S_CROP: {
 297                 struct v4l2_subdev_crop *crop = arg;
 298                 struct v4l2_subdev_selection sel;
 299
 300                 rval = check_crop(sd, crop);
 301                 if (rval)
 302                         return rval;
 303
 304                 memset(&sel, 0, sizeof(sel));
 305                 sel.which = crop->which;
 306                 sel.pad = crop->pad;
 307                 sel.target = V4L2_SEL_TGT_CROP;
 308                 sel.r = crop->rect;
 309
 310                 rval = v4l2_subdev_call(
 311                         sd, pad, set_selection, subdev_fh->pad, &sel);
 312
 313                 crop->rect = sel.r;
 314
 315                 return rval;
 316         }
 317
 318         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 319                 struct v4l2_subdev_mbus_code_enum *code = arg;
 320
 321                 if (code->which != V4L2_SUBDEV_FORMAT_TRY &&
 322                     code->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 323                         return -EINVAL;
 324
 325                 if (code->pad >= sd->entity.num_pads)
 326                         return -EINVAL;
 327
 328                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
 329                                         code);
 330         }
 331
 332         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 333                 struct v4l2_subdev_frame_size_enum *fse = arg;
 334
 335                 if (fse->which != V4L2_SUBDEV_FORMAT_TRY &&
 336                     fse->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 337                         return -EINVAL;
 338
 339                 if (fse->pad >= sd->entity.num_pads)
 340                         return -EINVAL;
 341
 342                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
 343                                         fse);
 344         }
 345
 346         case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
 347                 struct v4l2_subdev_frame_interval *fi = arg;
 348
 349                 if (fi->pad >= sd->entity.num_pads)
 350                         return -EINVAL;
 351
 352                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 353         }
 354
 355         case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
 356                 struct v4l2_subdev_frame_interval *fi = arg;
 357
 358                 if (fi->pad >= sd->entity.num_pads)
 359                         return -EINVAL;
 360
 361                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 362         }
 363
 364         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 365                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 366
 367                 if (fie->which != V4L2_SUBDEV_FORMAT_TRY &&
 368                     fie->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 369                         return -EINVAL;
 370
 371                 if (fie->pad >= sd->entity.num_pads)
 372                         return -EINVAL;
 373
 374                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
 375                                         fie);
 376         }
 377
 378         case VIDIOC_SUBDEV_G_SELECTION: {
 379                 struct v4l2_subdev_selection *sel = arg;
 380
 381                 rval = check_selection(sd, sel);
 382                 if (rval)
 383                         return rval;
 384
 385                 return v4l2_subdev_call(
 386                         sd, pad, get_selection, subdev_fh->pad, sel);
 387         }
 388
 389         case VIDIOC_SUBDEV_S_SELECTION: {
 390                 struct v4l2_subdev_selection *sel = arg;
 391
 392                 rval = check_selection(sd, sel);
 393                 if (rval)
 394                         return rval;
 395
 396                 return v4l2_subdev_call(
 397                         sd, pad, set_selection, subdev_fh->pad, sel);
 398         }
 399
 400         case VIDIOC_G_EDID: {
 401                 struct v4l2_subdev_edid *edid = arg;
 402
 403                 rval = check_edid(sd, edid);
 404                 if (rval)
 405                         return rval;
 406
 407                 return v4l2_subdev_call(sd, pad, get_edid, edid);
 408         }
 409
 410         case VIDIOC_S_EDID: {
 411                 struct v4l2_subdev_edid *edid = arg;
 412
 413                 rval = check_edid(sd, edid);
 414                 if (rval)
 415                         return rval;
 416
 417                 return v4l2_subdev_call(sd, pad, set_edid, edid);
 418         }
 419
 420         case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
 421                 struct v4l2_dv_timings_cap *cap = arg;
 422
 423                 if (cap->pad >= sd->entity.num_pads)
 424                         return -EINVAL;
 425
 426                 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
 427         }
 428
 429         case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
 430                 struct v4l2_enum_dv_timings *dvt = arg;
 431
 432                 if (dvt->pad >= sd->entity.num_pads)
 433                         return -EINVAL;
 434
 435                 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
 436         }
 437
 438         case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
 439                 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
 440
 441         case VIDIOC_SUBDEV_G_DV_TIMINGS:
 442                 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
 443
 444         case VIDIOC_SUBDEV_S_DV_TIMINGS:
 445                 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
 446 #endif
 447         default:
 448                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 449         }
 450
 451         return 0;
 452 }
 453
 454 static long subdev_ioctl(struct file *file, unsigned int cmd,
 455         unsigned long arg)
 456 {
 457         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
 458 }
 459
 460 #ifdef CONFIG_COMPAT
 461 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 462         unsigned long arg)
 463 {
 464         struct video_device *vdev = video_devdata(file);
 465         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 466
 467         return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
 468 }
 469 #endif
 470
 471 static unsigned int subdev_poll(struct file *file, poll_table *wait)
 472 {
 473         struct video_device *vdev = video_devdata(file);
 474         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 475         struct v4l2_fh *fh = file->private_data;
 476
 477         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 478                 return POLLERR;
 479
 480         poll_wait(file, &fh->wait, wait);
 481
 482         if (v4l2_event_pending(fh))
 483                 return POLLPRI;
 484
 485         return 0;
 486 }
 487
 488 const struct v4l2_file_operations v4l2_subdev_fops = {
 489         .owner = THIS_MODULE,
 490         .open = subdev_open,
 491         .unlocked_ioctl = subdev_ioctl,
 492 #ifdef CONFIG_COMPAT
 493         .compat_ioctl32 = subdev_compat_ioctl32,
 494 #endif
 495         .release = subdev_close,
 496         .poll = subdev_poll,
 497 };
 498
 499 #ifdef CONFIG_MEDIA_CONTROLLER
 500 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
 501                                       struct media_link *link,
 502                                       struct v4l2_subdev_format *source_fmt,
 503                                       struct v4l2_subdev_format *sink_fmt)
 504 {
 505         /* The width, height and code must match. */
 506         if (source_fmt->format.width != sink_fmt->format.width
 507             || source_fmt->format.height != sink_fmt->format.height
 508             || source_fmt->format.code != sink_fmt->format.code)
 509                 return -EPIPE;
 510
 511         /* The field order must match, or the sink field order must be NONE
 512          * to support interlaced hardware connected to bridges that support
 513          * progressive formats only.
 514          */
 515         if (source_fmt->format.field != sink_fmt->format.field &&
 516             sink_fmt->format.field != V4L2_FIELD_NONE)
 517                 return -EPIPE;
 518
 519         return 0;
 520 }
 521 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
 522
 523 static int
 524 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
 525                                      struct v4l2_subdev_format *fmt)
 526 {
 527         if (is_media_entity_v4l2_subdev(pad->entity)) {
 528                 struct v4l2_subdev *sd =
 529                         media_entity_to_v4l2_subdev(pad->entity);
 530
 531                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
 532                 fmt->pad = pad->index;
 533                 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
 534         }
 535
 536         WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
 537              "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
 538              pad->entity->function, pad->entity->name);
 539
 540         return -EINVAL;
 541 }
 542
 543 int v4l2_subdev_link_validate(struct media_link *link)
 544 {
 545         struct v4l2_subdev *sink;
 546         struct v4l2_subdev_format sink_fmt, source_fmt;
 547         int rval;
 548
 549         rval = v4l2_subdev_link_validate_get_format(
 550                 link->source, &source_fmt);
 551         if (rval < 0)
 552                 return 0;
 553
 554         rval = v4l2_subdev_link_validate_get_format(
 555                 link->sink, &sink_fmt);
 556         if (rval < 0)
 557                 return 0;
 558
 559         sink = media_entity_to_v4l2_subdev(link->sink->entity);
 560
 561         rval = v4l2_subdev_call(sink, pad, link_validate, link,
 562                                 &source_fmt, &sink_fmt);
 563         if (rval != -ENOIOCTLCMD)
 564                 return rval;
 565
 566         return v4l2_subdev_link_validate_default(
 567                 sink, link, &source_fmt, &sink_fmt);
 568 }
 569 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
 570
 571 struct v4l2_subdev_pad_config *
 572 v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
 573 {
 574         struct v4l2_subdev_pad_config *cfg;
 575         int ret;
 576
 577         if (!sd->entity.num_pads)
 578                 return NULL;
 579
 580         cfg = kcalloc(sd->entity.num_pads, sizeof(*cfg), GFP_KERNEL);
 581         if (!cfg)
 582                 return NULL;
 583
 584         ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
 585         if (ret < 0 && ret != -ENOIOCTLCMD) {
 586                 kfree(cfg);
 587                 return NULL;
 588         }
 589
 590         return cfg;
 591 }
 592 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
 593
 594 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
 595 {
 596         kfree(cfg);
 597 }
 598 EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
 599 #endif /* CONFIG_MEDIA_CONTROLLER */
 600
 601 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 602 {
 603         INIT_LIST_HEAD(&sd->list);
 604         BUG_ON(!ops);
 605         sd->ops = ops;
 606         sd->v4l2_dev = NULL;
 607         sd->flags = 0;
 608         sd->name[0] = '\0';
 609         sd->grp_id = 0;
 610         sd->dev_priv = NULL;
 611         sd->host_priv = NULL;
 612 #if defined(CONFIG_MEDIA_CONTROLLER)
 613         sd->entity.name = sd->name;
 614         sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
 615         sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 616 #endif
 617 }
 618 EXPORT_SYMBOL(v4l2_subdev_init);
 619
 620 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 621                               const struct v4l2_event *ev)
 622 {
 623         v4l2_event_queue(sd->devnode, ev);
 624         v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
 625 }
 626 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);