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
  19 #include <media/v4l2-ctrls.h>
  20 #include <media/v4l2-device.h>
  21 #include <media/v4l2-ioctl.h>
  22 #include <media/v4l2-fh.h>
  23 #include <media/v4l2-event.h>
  24
  25 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
  26 {
  27 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  28         if (sd->entity.num_pads) {
  29                 fh->pad = v4l2_subdev_alloc_pad_config(sd);
  30                 if (fh->pad == NULL)
  31                         return -ENOMEM;
  32         }
  33 #endif
  34         return 0;
  35 }
  36
  37 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
  38 {
  39 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  40         v4l2_subdev_free_pad_config(fh->pad);
  41         fh->pad = NULL;
  42 #endif
  43 }
  44
  45 static int subdev_open(struct file *file)
  46 {
  47         struct video_device *vdev = video_devdata(file);
  48         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  49         struct v4l2_subdev_fh *subdev_fh;
  50         int ret;
  51
  52         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
  53         if (subdev_fh == NULL)
  54                 return -ENOMEM;
  55
  56         ret = subdev_fh_init(subdev_fh, sd);
  57         if (ret) {
  58                 kfree(subdev_fh);
  59                 return ret;
  60         }
  61
  62         v4l2_fh_init(&subdev_fh->vfh, vdev);
  63         v4l2_fh_add(&subdev_fh->vfh);
  64         file->private_data = &subdev_fh->vfh;
  65 #if defined(CONFIG_MEDIA_CONTROLLER)
  66         if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
  67                 struct module *owner;
  68
  69                 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
  70                 if (!try_module_get(owner)) {
  71                         ret = -EBUSY;
  72                         goto err;
  73                 }
  74                 subdev_fh->owner = owner;
  75         }
  76 #endif
  77
  78         if (sd->internal_ops && sd->internal_ops->open) {
  79                 ret = sd->internal_ops->open(sd, subdev_fh);
  80                 if (ret < 0)
  81                         goto err;
  82         }
  83
  84         return 0;
  85
  86 err:
  87         module_put(subdev_fh->owner);
  88         v4l2_fh_del(&subdev_fh->vfh);
  89         v4l2_fh_exit(&subdev_fh->vfh);
  90         subdev_fh_free(subdev_fh);
  91         kfree(subdev_fh);
  92
  93         return ret;
  94 }
  95
  96 static int subdev_close(struct file *file)
  97 {
  98         struct video_device *vdev = video_devdata(file);
  99         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 100         struct v4l2_fh *vfh = file->private_data;
 101         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 102
 103         if (sd->internal_ops && sd->internal_ops->close)
 104                 sd->internal_ops->close(sd, subdev_fh);
 105         module_put(subdev_fh->owner);
 106         v4l2_fh_del(vfh);
 107         v4l2_fh_exit(vfh);
 108         subdev_fh_free(subdev_fh);
 109         kfree(subdev_fh);
 110         file->private_data = NULL;
 111
 112         return 0;
 113 }
 114
 115 static inline int check_which(__u32 which)
 116 {
 117         if (which != V4L2_SUBDEV_FORMAT_TRY &&
 118             which != V4L2_SUBDEV_FORMAT_ACTIVE)
 119                 return -EINVAL;
 120
 121         return 0;
 122 }
 123
 124 static inline int check_pad(struct v4l2_subdev *sd, __u32 pad)
 125 {
 126 #if defined(CONFIG_MEDIA_CONTROLLER)
 127         if (sd->entity.num_pads) {
 128                 if (pad >= sd->entity.num_pads)
 129                         return -EINVAL;
 130                 return 0;
 131         }
 132 #endif
 133         /* allow pad 0 on subdevices not registered as media entities */
 134         if (pad > 0)
 135                 return -EINVAL;
 136         return 0;
 137 }
 138
 139 static int check_cfg(__u32 which, struct v4l2_subdev_pad_config *cfg)
 140 {
 141         if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
 142                 return -EINVAL;
 143
 144         return 0;
 145 }
 146
 147 static inline int check_format(struct v4l2_subdev *sd,
 148                                struct v4l2_subdev_pad_config *cfg,
 149                                struct v4l2_subdev_format *format)
 150 {
 151         if (!format)
 152                 return -EINVAL;
 153
 154         return check_which(format->which) ? : check_pad(sd, format->pad) ? :
 155                check_cfg(format->which, cfg);
 156 }
 157
 158 static int call_get_fmt(struct v4l2_subdev *sd,
 159                         struct v4l2_subdev_pad_config *cfg,
 160                         struct v4l2_subdev_format *format)
 161 {
 162         return check_format(sd, cfg, format) ? :
 163                sd->ops->pad->get_fmt(sd, cfg, format);
 164 }
 165
 166 static int call_set_fmt(struct v4l2_subdev *sd,
 167                         struct v4l2_subdev_pad_config *cfg,
 168                         struct v4l2_subdev_format *format)
 169 {
 170         return check_format(sd, cfg, format) ? :
 171                sd->ops->pad->set_fmt(sd, cfg, format);
 172 }
 173
 174 static int call_enum_mbus_code(struct v4l2_subdev *sd,
 175                                struct v4l2_subdev_pad_config *cfg,
 176                                struct v4l2_subdev_mbus_code_enum *code)
 177 {
 178         if (!code)
 179                 return -EINVAL;
 180
 181         return check_which(code->which) ? : check_pad(sd, code->pad) ? :
 182                check_cfg(code->which, cfg) ? :
 183                sd->ops->pad->enum_mbus_code(sd, cfg, code);
 184 }
 185
 186 static int call_enum_frame_size(struct v4l2_subdev *sd,
 187                                 struct v4l2_subdev_pad_config *cfg,
 188                                 struct v4l2_subdev_frame_size_enum *fse)
 189 {
 190         if (!fse)
 191                 return -EINVAL;
 192
 193         return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
 194                check_cfg(fse->which, cfg) ? :
 195                sd->ops->pad->enum_frame_size(sd, cfg, fse);
 196 }
 197
 198 static inline int check_frame_interval(struct v4l2_subdev *sd,
 199                                        struct v4l2_subdev_frame_interval *fi)
 200 {
 201         if (!fi)
 202                 return -EINVAL;
 203
 204         return check_pad(sd, fi->pad);
 205 }
 206
 207 static int call_g_frame_interval(struct v4l2_subdev *sd,
 208                                  struct v4l2_subdev_frame_interval *fi)
 209 {
 210         return check_frame_interval(sd, fi) ? :
 211                sd->ops->video->g_frame_interval(sd, fi);
 212 }
 213
 214 static int call_s_frame_interval(struct v4l2_subdev *sd,
 215                                  struct v4l2_subdev_frame_interval *fi)
 216 {
 217         return check_frame_interval(sd, fi) ? :
 218                sd->ops->video->s_frame_interval(sd, fi);
 219 }
 220
 221 static int call_enum_frame_interval(struct v4l2_subdev *sd,
 222                                     struct v4l2_subdev_pad_config *cfg,
 223                                     struct v4l2_subdev_frame_interval_enum *fie)
 224 {
 225         if (!fie)
 226                 return -EINVAL;
 227
 228         return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
 229                check_cfg(fie->which, cfg) ? :
 230                sd->ops->pad->enum_frame_interval(sd, cfg, fie);
 231 }
 232
 233 static inline int check_selection(struct v4l2_subdev *sd,
 234                                   struct v4l2_subdev_pad_config *cfg,
 235                                   struct v4l2_subdev_selection *sel)
 236 {
 237         if (!sel)
 238                 return -EINVAL;
 239
 240         return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
 241                check_cfg(sel->which, cfg);
 242 }
 243
 244 static int call_get_selection(struct v4l2_subdev *sd,
 245                               struct v4l2_subdev_pad_config *cfg,
 246                               struct v4l2_subdev_selection *sel)
 247 {
 248         return check_selection(sd, cfg, sel) ? :
 249                sd->ops->pad->get_selection(sd, cfg, sel);
 250 }
 251
 252 static int call_set_selection(struct v4l2_subdev *sd,
 253                               struct v4l2_subdev_pad_config *cfg,
 254                               struct v4l2_subdev_selection *sel)
 255 {
 256         return check_selection(sd, cfg, sel) ? :
 257                sd->ops->pad->set_selection(sd, cfg, sel);
 258 }
 259
 260 static inline int check_edid(struct v4l2_subdev *sd,
 261                              struct v4l2_subdev_edid *edid)
 262 {
 263         if (!edid)
 264                 return -EINVAL;
 265
 266         if (edid->blocks && edid->edid == NULL)
 267                 return -EINVAL;
 268
 269         return check_pad(sd, edid->pad);
 270 }
 271
 272 static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 273 {
 274         return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
 275 }
 276
 277 static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 278 {
 279         return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
 280 }
 281
 282 static int call_dv_timings_cap(struct v4l2_subdev *sd,
 283                                struct v4l2_dv_timings_cap *cap)
 284 {
 285         if (!cap)
 286                 return -EINVAL;
 287
 288         return check_pad(sd, cap->pad) ? :
 289                sd->ops->pad->dv_timings_cap(sd, cap);
 290 }
 291
 292 static int call_enum_dv_timings(struct v4l2_subdev *sd,
 293                                 struct v4l2_enum_dv_timings *dvt)
 294 {
 295         if (!dvt)
 296                 return -EINVAL;
 297
 298         return check_pad(sd, dvt->pad) ? :
 299                sd->ops->pad->enum_dv_timings(sd, dvt);
 300 }
 301
 302 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
 303         .get_fmt                = call_get_fmt,
 304         .set_fmt                = call_set_fmt,
 305         .enum_mbus_code         = call_enum_mbus_code,
 306         .enum_frame_size        = call_enum_frame_size,
 307         .enum_frame_interval    = call_enum_frame_interval,
 308         .get_selection          = call_get_selection,
 309         .set_selection          = call_set_selection,
 310         .get_edid               = call_get_edid,
 311         .set_edid               = call_set_edid,
 312         .dv_timings_cap         = call_dv_timings_cap,
 313         .enum_dv_timings        = call_enum_dv_timings,
 314 };
 315
 316 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
 317         .g_frame_interval       = call_g_frame_interval,
 318         .s_frame_interval       = call_s_frame_interval,
 319 };
 320
 321 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
 322         .pad    = &v4l2_subdev_call_pad_wrappers,
 323         .video  = &v4l2_subdev_call_video_wrappers,
 324 };
 325 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
 326
 327 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 328 {
 329         struct video_device *vdev = video_devdata(file);
 330         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 331         struct v4l2_fh *vfh = file->private_data;
 332 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 333         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 334         int rval;
 335 #endif
 336
 337         switch (cmd) {
 338         case VIDIOC_QUERYCTRL:
 339                 /*
 340                  * TODO: this really should be folded into v4l2_queryctrl (this
 341                  * currently returns -EINVAL for NULL control handlers).
 342                  * However, v4l2_queryctrl() is still called directly by
 343                  * drivers as well and until that has been addressed I believe
 344                  * it is safer to do the check here. The same is true for the
 345                  * other control ioctls below.
 346                  */
 347                 if (!vfh->ctrl_handler)
 348                         return -ENOTTY;
 349                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 350
 351         case VIDIOC_QUERY_EXT_CTRL:
 352                 if (!vfh->ctrl_handler)
 353                         return -ENOTTY;
 354                 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
 355
 356         case VIDIOC_QUERYMENU:
 357                 if (!vfh->ctrl_handler)
 358                         return -ENOTTY;
 359                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 360
 361         case VIDIOC_G_CTRL:
 362                 if (!vfh->ctrl_handler)
 363                         return -ENOTTY;
 364                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 365
 366         case VIDIOC_S_CTRL:
 367                 if (!vfh->ctrl_handler)
 368                         return -ENOTTY;
 369                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 370
 371         case VIDIOC_G_EXT_CTRLS:
 372                 if (!vfh->ctrl_handler)
 373                         return -ENOTTY;
 374                 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
 375                                         sd->v4l2_dev->mdev, arg);
 376
 377         case VIDIOC_S_EXT_CTRLS:
 378                 if (!vfh->ctrl_handler)
 379                         return -ENOTTY;
 380                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
 381                                         sd->v4l2_dev->mdev, arg);
 382
 383         case VIDIOC_TRY_EXT_CTRLS:
 384                 if (!vfh->ctrl_handler)
 385                         return -ENOTTY;
 386                 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
 387                                           sd->v4l2_dev->mdev, arg);
 388
 389         case VIDIOC_DQEVENT:
 390                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 391                         return -ENOIOCTLCMD;
 392
 393                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 394
 395         case VIDIOC_SUBSCRIBE_EVENT:
 396                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 397
 398         case VIDIOC_UNSUBSCRIBE_EVENT:
 399                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 400
 401 #ifdef CONFIG_VIDEO_ADV_DEBUG
 402         case VIDIOC_DBG_G_REGISTER:
 403         {
 404                 struct v4l2_dbg_register *p = arg;
 405
 406                 if (!capable(CAP_SYS_ADMIN))
 407                         return -EPERM;
 408                 return v4l2_subdev_call(sd, core, g_register, p);
 409         }
 410         case VIDIOC_DBG_S_REGISTER:
 411         {
 412                 struct v4l2_dbg_register *p = arg;
 413
 414                 if (!capable(CAP_SYS_ADMIN))
 415                         return -EPERM;
 416                 return v4l2_subdev_call(sd, core, s_register, p);
 417         }
 418         case VIDIOC_DBG_G_CHIP_INFO:
 419         {
 420                 struct v4l2_dbg_chip_info *p = arg;
 421
 422                 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
 423                         return -EINVAL;
 424                 if (sd->ops->core && sd->ops->core->s_register)
 425                         p->flags |= V4L2_CHIP_FL_WRITABLE;
 426                 if (sd->ops->core && sd->ops->core->g_register)
 427                         p->flags |= V4L2_CHIP_FL_READABLE;
 428                 strscpy(p->name, sd->name, sizeof(p->name));
 429                 return 0;
 430         }
 431 #endif
 432
 433         case VIDIOC_LOG_STATUS: {
 434                 int ret;
 435
 436                 pr_info("%s: =================  START STATUS  =================\n",
 437                         sd->name);
 438                 ret = v4l2_subdev_call(sd, core, log_status);
 439                 pr_info("%s: ==================  END STATUS  ==================\n",
 440                         sd->name);
 441                 return ret;
 442         }
 443
 444 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 445         case VIDIOC_SUBDEV_G_FMT: {
 446                 struct v4l2_subdev_format *format = arg;
 447
 448                 memset(format->reserved, 0, sizeof(format->reserved));
 449                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 450                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
 451         }
 452
 453         case VIDIOC_SUBDEV_S_FMT: {
 454                 struct v4l2_subdev_format *format = arg;
 455
 456                 memset(format->reserved, 0, sizeof(format->reserved));
 457                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 458                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
 459         }
 460
 461         case VIDIOC_SUBDEV_G_CROP: {
 462                 struct v4l2_subdev_crop *crop = arg;
 463                 struct v4l2_subdev_selection sel;
 464
 465                 memset(crop->reserved, 0, sizeof(crop->reserved));
 466                 memset(&sel, 0, sizeof(sel));
 467                 sel.which = crop->which;
 468                 sel.pad = crop->pad;
 469                 sel.target = V4L2_SEL_TGT_CROP;
 470
 471                 rval = v4l2_subdev_call(
 472                         sd, pad, get_selection, subdev_fh->pad, &sel);
 473
 474                 crop->rect = sel.r;
 475
 476                 return rval;
 477         }
 478
 479         case VIDIOC_SUBDEV_S_CROP: {
 480                 struct v4l2_subdev_crop *crop = arg;
 481                 struct v4l2_subdev_selection sel;
 482
 483                 memset(crop->reserved, 0, sizeof(crop->reserved));
 484                 memset(&sel, 0, sizeof(sel));
 485                 sel.which = crop->which;
 486                 sel.pad = crop->pad;
 487                 sel.target = V4L2_SEL_TGT_CROP;
 488                 sel.r = crop->rect;
 489
 490                 rval = v4l2_subdev_call(
 491                         sd, pad, set_selection, subdev_fh->pad, &sel);
 492
 493                 crop->rect = sel.r;
 494
 495                 return rval;
 496         }
 497
 498         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 499                 struct v4l2_subdev_mbus_code_enum *code = arg;
 500
 501                 memset(code->reserved, 0, sizeof(code->reserved));
 502                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
 503                                         code);
 504         }
 505
 506         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 507                 struct v4l2_subdev_frame_size_enum *fse = arg;
 508
 509                 memset(fse->reserved, 0, sizeof(fse->reserved));
 510                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
 511                                         fse);
 512         }
 513
 514         case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
 515                 struct v4l2_subdev_frame_interval *fi = arg;
 516
 517                 memset(fi->reserved, 0, sizeof(fi->reserved));
 518                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 519         }
 520
 521         case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
 522                 struct v4l2_subdev_frame_interval *fi = arg;
 523
 524                 memset(fi->reserved, 0, sizeof(fi->reserved));
 525                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 526         }
 527
 528         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 529                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 530
 531                 memset(fie->reserved, 0, sizeof(fie->reserved));
 532                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
 533                                         fie);
 534         }
 535
 536         case VIDIOC_SUBDEV_G_SELECTION: {
 537                 struct v4l2_subdev_selection *sel = arg;
 538
 539                 memset(sel->reserved, 0, sizeof(sel->reserved));
 540                 return v4l2_subdev_call(
 541                         sd, pad, get_selection, subdev_fh->pad, sel);
 542         }
 543
 544         case VIDIOC_SUBDEV_S_SELECTION: {
 545                 struct v4l2_subdev_selection *sel = arg;
 546
 547                 memset(sel->reserved, 0, sizeof(sel->reserved));
 548                 return v4l2_subdev_call(
 549                         sd, pad, set_selection, subdev_fh->pad, sel);
 550         }
 551
 552         case VIDIOC_G_EDID: {
 553                 struct v4l2_subdev_edid *edid = arg;
 554
 555                 return v4l2_subdev_call(sd, pad, get_edid, edid);
 556         }
 557
 558         case VIDIOC_S_EDID: {
 559                 struct v4l2_subdev_edid *edid = arg;
 560
 561                 return v4l2_subdev_call(sd, pad, set_edid, edid);
 562         }
 563
 564         case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
 565                 struct v4l2_dv_timings_cap *cap = arg;
 566
 567                 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
 568         }
 569
 570         case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
 571                 struct v4l2_enum_dv_timings *dvt = arg;
 572
 573                 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
 574         }
 575
 576         case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
 577                 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
 578
 579         case VIDIOC_SUBDEV_G_DV_TIMINGS:
 580                 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
 581
 582         case VIDIOC_SUBDEV_S_DV_TIMINGS:
 583                 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
 584
 585         case VIDIOC_SUBDEV_G_STD:
 586                 return v4l2_subdev_call(sd, video, g_std, arg);
 587
 588         case VIDIOC_SUBDEV_S_STD: {
 589                 v4l2_std_id *std = arg;
 590
 591                 return v4l2_subdev_call(sd, video, s_std, *std);
 592         }
 593
 594         case VIDIOC_SUBDEV_ENUMSTD: {
 595                 struct v4l2_standard *p = arg;
 596                 v4l2_std_id id;
 597
 598                 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
 599                         return -EINVAL;
 600
 601                 return v4l_video_std_enumstd(p, id);
 602         }
 603
 604         case VIDIOC_SUBDEV_QUERYSTD:
 605                 return v4l2_subdev_call(sd, video, querystd, arg);
 606 #endif
 607         default:
 608                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 609         }
 610
 611         return 0;
 612 }
 613
 614 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
 615 {
 616         struct video_device *vdev = video_devdata(file);
 617         struct mutex *lock = vdev->lock;
 618         long ret = -ENODEV;
 619
 620         if (lock && mutex_lock_interruptible(lock))
 621                 return -ERESTARTSYS;
 622         if (video_is_registered(vdev))
 623                 ret = subdev_do_ioctl(file, cmd, arg);
 624         if (lock)
 625                 mutex_unlock(lock);
 626         return ret;
 627 }
 628
 629 static long subdev_ioctl(struct file *file, unsigned int cmd,
 630         unsigned long arg)
 631 {
 632         return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
 633 }
 634
 635 #ifdef CONFIG_COMPAT
 636 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 637         unsigned long arg)
 638 {
 639         struct video_device *vdev = video_devdata(file);
 640         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 641
 642         return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
 643 }
 644 #endif
 645
 646 static __poll_t subdev_poll(struct file *file, poll_table *wait)
 647 {
 648         struct video_device *vdev = video_devdata(file);
 649         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 650         struct v4l2_fh *fh = file->private_data;
 651
 652         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 653                 return EPOLLERR;
 654
 655         poll_wait(file, &fh->wait, wait);
 656
 657         if (v4l2_event_pending(fh))
 658                 return EPOLLPRI;
 659
 660         return 0;
 661 }
 662
 663 const struct v4l2_file_operations v4l2_subdev_fops = {
 664         .owner = THIS_MODULE,
 665         .open = subdev_open,
 666         .unlocked_ioctl = subdev_ioctl,
 667 #ifdef CONFIG_COMPAT
 668         .compat_ioctl32 = subdev_compat_ioctl32,
 669 #endif
 670         .release = subdev_close,
 671         .poll = subdev_poll,
 672 };
 673
 674 #ifdef CONFIG_MEDIA_CONTROLLER
 675 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
 676                                       struct media_link *link,
 677                                       struct v4l2_subdev_format *source_fmt,
 678                                       struct v4l2_subdev_format *sink_fmt)
 679 {
 680         /* The width, height and code must match. */
 681         if (source_fmt->format.width != sink_fmt->format.width
 682             || source_fmt->format.height != sink_fmt->format.height
 683             || source_fmt->format.code != sink_fmt->format.code)
 684                 return -EPIPE;
 685
 686         /* The field order must match, or the sink field order must be NONE
 687          * to support interlaced hardware connected to bridges that support
 688          * progressive formats only.
 689          */
 690         if (source_fmt->format.field != sink_fmt->format.field &&
 691             sink_fmt->format.field != V4L2_FIELD_NONE)
 692                 return -EPIPE;
 693
 694         return 0;
 695 }
 696 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
 697
 698 static int
 699 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
 700                                      struct v4l2_subdev_format *fmt)
 701 {
 702         if (is_media_entity_v4l2_subdev(pad->entity)) {
 703                 struct v4l2_subdev *sd =
 704                         media_entity_to_v4l2_subdev(pad->entity);
 705
 706                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
 707                 fmt->pad = pad->index;
 708                 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
 709         }
 710
 711         WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
 712              "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
 713              pad->entity->function, pad->entity->name);
 714
 715         return -EINVAL;
 716 }
 717
 718 int v4l2_subdev_link_validate(struct media_link *link)
 719 {
 720         struct v4l2_subdev *sink;
 721         struct v4l2_subdev_format sink_fmt, source_fmt;
 722         int rval;
 723
 724         rval = v4l2_subdev_link_validate_get_format(
 725                 link->source, &source_fmt);
 726         if (rval < 0)
 727                 return 0;
 728
 729         rval = v4l2_subdev_link_validate_get_format(
 730                 link->sink, &sink_fmt);
 731         if (rval < 0)
 732                 return 0;
 733
 734         sink = media_entity_to_v4l2_subdev(link->sink->entity);
 735
 736         rval = v4l2_subdev_call(sink, pad, link_validate, link,
 737                                 &source_fmt, &sink_fmt);
 738         if (rval != -ENOIOCTLCMD)
 739                 return rval;
 740
 741         return v4l2_subdev_link_validate_default(
 742                 sink, link, &source_fmt, &sink_fmt);
 743 }
 744 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
 745
 746 struct v4l2_subdev_pad_config *
 747 v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
 748 {
 749         struct v4l2_subdev_pad_config *cfg;
 750         int ret;
 751
 752         if (!sd->entity.num_pads)
 753                 return NULL;
 754
 755         cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
 756                              GFP_KERNEL | __GFP_ZERO);
 757         if (!cfg)
 758                 return NULL;
 759
 760         ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
 761         if (ret < 0 && ret != -ENOIOCTLCMD) {
 762                 kvfree(cfg);
 763                 return NULL;
 764         }
 765
 766         return cfg;
 767 }
 768 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
 769
 770 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
 771 {
 772         kvfree(cfg);
 773 }
 774 EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
 775 #endif /* CONFIG_MEDIA_CONTROLLER */
 776
 777 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 778 {
 779         INIT_LIST_HEAD(&sd->list);
 780         BUG_ON(!ops);
 781         sd->ops = ops;
 782         sd->v4l2_dev = NULL;
 783         sd->flags = 0;
 784         sd->name[0] = '\0';
 785         sd->grp_id = 0;
 786         sd->dev_priv = NULL;
 787         sd->host_priv = NULL;
 788 #if defined(CONFIG_MEDIA_CONTROLLER)
 789         sd->entity.name = sd->name;
 790         sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
 791         sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 792 #endif
 793 }
 794 EXPORT_SYMBOL(v4l2_subdev_init);
 795
 796 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 797                               const struct v4l2_event *ev)
 798 {
 799         v4l2_event_queue(sd->devnode, ev);
 800         v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
 801 }
 802 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);