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 <[email protected]>
   8  *          Sakari Ailus <[email protected]>
   9  */
  10
  11 #include <linux/ioctl.h>
  12 #include <linux/mm.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/types.h>
  16 #include <linux/videodev2.h>
  17 #include <linux/export.h>
  18 #include <linux/version.h>
  19
  20 #include <media/v4l2-ctrls.h>
  21 #include <media/v4l2-device.h>
  22 #include <media/v4l2-ioctl.h>
  23 #include <media/v4l2-fh.h>
  24 #include <media/v4l2-event.h>
  25
  26 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  27 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
  28 {
  29         struct v4l2_subdev_state *state;
  30
  31         state = v4l2_subdev_alloc_state(sd);
  32         if (IS_ERR(state))
  33                 return PTR_ERR(state);
  34
  35         fh->state = state;
  36
  37         return 0;
  38 }
  39
  40 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
  41 {
  42         v4l2_subdev_free_state(fh->state);
  43         fh->state = NULL;
  44 }
  45
  46 static int subdev_open(struct file *file)
  47 {
  48         struct video_device *vdev = video_devdata(file);
  49         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  50         struct v4l2_subdev_fh *subdev_fh;
  51         int ret;
  52
  53         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
  54         if (subdev_fh == NULL)
  55                 return -ENOMEM;
  56
  57         ret = subdev_fh_init(subdev_fh, sd);
  58         if (ret) {
  59                 kfree(subdev_fh);
  60                 return ret;
  61         }
  62
  63         v4l2_fh_init(&subdev_fh->vfh, vdev);
  64         v4l2_fh_add(&subdev_fh->vfh);
  65         file->private_data = &subdev_fh->vfh;
  66 #if defined(CONFIG_MEDIA_CONTROLLER)
  67         if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
  68                 struct module *owner;
  69
  70                 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
  71                 if (!try_module_get(owner)) {
  72                         ret = -EBUSY;
  73                         goto err;
  74                 }
  75                 subdev_fh->owner = owner;
  76         }
  77 #endif
  78
  79         if (sd->internal_ops && sd->internal_ops->open) {
  80                 ret = sd->internal_ops->open(sd, subdev_fh);
  81                 if (ret < 0)
  82                         goto err;
  83         }
  84
  85         return 0;
  86
  87 err:
  88         module_put(subdev_fh->owner);
  89         v4l2_fh_del(&subdev_fh->vfh);
  90         v4l2_fh_exit(&subdev_fh->vfh);
  91         subdev_fh_free(subdev_fh);
  92         kfree(subdev_fh);
  93
  94         return ret;
  95 }
  96
  97 static int subdev_close(struct file *file)
  98 {
  99         struct video_device *vdev = video_devdata(file);
 100         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 101         struct v4l2_fh *vfh = file->private_data;
 102         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 103
 104         if (sd->internal_ops && sd->internal_ops->close)
 105                 sd->internal_ops->close(sd, subdev_fh);
 106         module_put(subdev_fh->owner);
 107         v4l2_fh_del(vfh);
 108         v4l2_fh_exit(vfh);
 109         subdev_fh_free(subdev_fh);
 110         kfree(subdev_fh);
 111         file->private_data = NULL;
 112
 113         return 0;
 114 }
 115 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 116 static int subdev_open(struct file *file)
 117 {
 118         return -ENODEV;
 119 }
 120
 121 static int subdev_close(struct file *file)
 122 {
 123         return -ENODEV;
 124 }
 125 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 126
 127 static inline int check_which(u32 which)
 128 {
 129         if (which != V4L2_SUBDEV_FORMAT_TRY &&
 130             which != V4L2_SUBDEV_FORMAT_ACTIVE)
 131                 return -EINVAL;
 132
 133         return 0;
 134 }
 135
 136 static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
 137 {
 138 #if defined(CONFIG_MEDIA_CONTROLLER)
 139         if (sd->entity.num_pads) {
 140                 if (pad >= sd->entity.num_pads)
 141                         return -EINVAL;
 142                 return 0;
 143         }
 144 #endif
 145         /* allow pad 0 on subdevices not registered as media entities */
 146         if (pad > 0)
 147                 return -EINVAL;
 148         return 0;
 149 }
 150
 151 static int check_state_pads(u32 which, struct v4l2_subdev_state *state)
 152 {
 153         if (which == V4L2_SUBDEV_FORMAT_TRY && (!state || !state->pads))
 154                 return -EINVAL;
 155
 156         return 0;
 157 }
 158
 159 static inline int check_format(struct v4l2_subdev *sd,
 160                                struct v4l2_subdev_state *state,
 161                                struct v4l2_subdev_format *format)
 162 {
 163         if (!format)
 164                 return -EINVAL;
 165
 166         return check_which(format->which) ? : check_pad(sd, format->pad) ? :
 167                check_state_pads(format->which, state);
 168 }
 169
 170 static int call_get_fmt(struct v4l2_subdev *sd,
 171                         struct v4l2_subdev_state *state,
 172                         struct v4l2_subdev_format *format)
 173 {
 174         return check_format(sd, state, format) ? :
 175                sd->ops->pad->get_fmt(sd, state, format);
 176 }
 177
 178 static int call_set_fmt(struct v4l2_subdev *sd,
 179                         struct v4l2_subdev_state *state,
 180                         struct v4l2_subdev_format *format)
 181 {
 182         return check_format(sd, state, format) ? :
 183                sd->ops->pad->set_fmt(sd, state, format);
 184 }
 185
 186 static int call_enum_mbus_code(struct v4l2_subdev *sd,
 187                                struct v4l2_subdev_state *state,
 188                                struct v4l2_subdev_mbus_code_enum *code)
 189 {
 190         if (!code)
 191                 return -EINVAL;
 192
 193         return check_which(code->which) ? : check_pad(sd, code->pad) ? :
 194                check_state_pads(code->which, state) ? :
 195                sd->ops->pad->enum_mbus_code(sd, state, code);
 196 }
 197
 198 static int call_enum_frame_size(struct v4l2_subdev *sd,
 199                                 struct v4l2_subdev_state *state,
 200                                 struct v4l2_subdev_frame_size_enum *fse)
 201 {
 202         if (!fse)
 203                 return -EINVAL;
 204
 205         return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
 206                check_state_pads(fse->which, state) ? :
 207                sd->ops->pad->enum_frame_size(sd, state, fse);
 208 }
 209
 210 static inline int check_frame_interval(struct v4l2_subdev *sd,
 211                                        struct v4l2_subdev_frame_interval *fi)
 212 {
 213         if (!fi)
 214                 return -EINVAL;
 215
 216         return check_pad(sd, fi->pad);
 217 }
 218
 219 static int call_g_frame_interval(struct v4l2_subdev *sd,
 220                                  struct v4l2_subdev_frame_interval *fi)
 221 {
 222         return check_frame_interval(sd, fi) ? :
 223                sd->ops->video->g_frame_interval(sd, fi);
 224 }
 225
 226 static int call_s_frame_interval(struct v4l2_subdev *sd,
 227                                  struct v4l2_subdev_frame_interval *fi)
 228 {
 229         return check_frame_interval(sd, fi) ? :
 230                sd->ops->video->s_frame_interval(sd, fi);
 231 }
 232
 233 static int call_enum_frame_interval(struct v4l2_subdev *sd,
 234                                     struct v4l2_subdev_state *state,
 235                                     struct v4l2_subdev_frame_interval_enum *fie)
 236 {
 237         if (!fie)
 238                 return -EINVAL;
 239
 240         return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
 241                check_state_pads(fie->which, state) ? :
 242                sd->ops->pad->enum_frame_interval(sd, state, fie);
 243 }
 244
 245 static inline int check_selection(struct v4l2_subdev *sd,
 246                                   struct v4l2_subdev_state *state,
 247                                   struct v4l2_subdev_selection *sel)
 248 {
 249         if (!sel)
 250                 return -EINVAL;
 251
 252         return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
 253                check_state_pads(sel->which, state);
 254 }
 255
 256 static int call_get_selection(struct v4l2_subdev *sd,
 257                               struct v4l2_subdev_state *state,
 258                               struct v4l2_subdev_selection *sel)
 259 {
 260         return check_selection(sd, state, sel) ? :
 261                sd->ops->pad->get_selection(sd, state, sel);
 262 }
 263
 264 static int call_set_selection(struct v4l2_subdev *sd,
 265                               struct v4l2_subdev_state *state,
 266                               struct v4l2_subdev_selection *sel)
 267 {
 268         return check_selection(sd, state, sel) ? :
 269                sd->ops->pad->set_selection(sd, state, sel);
 270 }
 271
 272 static inline int check_edid(struct v4l2_subdev *sd,
 273                              struct v4l2_subdev_edid *edid)
 274 {
 275         if (!edid)
 276                 return -EINVAL;
 277
 278         if (edid->blocks && edid->edid == NULL)
 279                 return -EINVAL;
 280
 281         return check_pad(sd, edid->pad);
 282 }
 283
 284 static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 285 {
 286         return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
 287 }
 288
 289 static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 290 {
 291         return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
 292 }
 293
 294 static int call_dv_timings_cap(struct v4l2_subdev *sd,
 295                                struct v4l2_dv_timings_cap *cap)
 296 {
 297         if (!cap)
 298                 return -EINVAL;
 299
 300         return check_pad(sd, cap->pad) ? :
 301                sd->ops->pad->dv_timings_cap(sd, cap);
 302 }
 303
 304 static int call_enum_dv_timings(struct v4l2_subdev *sd,
 305                                 struct v4l2_enum_dv_timings *dvt)
 306 {
 307         if (!dvt)
 308                 return -EINVAL;
 309
 310         return check_pad(sd, dvt->pad) ? :
 311                sd->ops->pad->enum_dv_timings(sd, dvt);
 312 }
 313
 314 static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
 315                                 struct v4l2_mbus_config *config)
 316 {
 317         return check_pad(sd, pad) ? :
 318                sd->ops->pad->get_mbus_config(sd, pad, config);
 319 }
 320
 321 static int call_set_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
 322                                 struct v4l2_mbus_config *config)
 323 {
 324         return check_pad(sd, pad) ? :
 325                sd->ops->pad->get_mbus_config(sd, pad, config);
 326 }
 327
 328 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
 329         .get_fmt                = call_get_fmt,
 330         .set_fmt                = call_set_fmt,
 331         .enum_mbus_code         = call_enum_mbus_code,
 332         .enum_frame_size        = call_enum_frame_size,
 333         .enum_frame_interval    = call_enum_frame_interval,
 334         .get_selection          = call_get_selection,
 335         .set_selection          = call_set_selection,
 336         .get_edid               = call_get_edid,
 337         .set_edid               = call_set_edid,
 338         .dv_timings_cap         = call_dv_timings_cap,
 339         .enum_dv_timings        = call_enum_dv_timings,
 340         .get_mbus_config        = call_get_mbus_config,
 341         .set_mbus_config        = call_set_mbus_config,
 342 };
 343
 344 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
 345         .g_frame_interval       = call_g_frame_interval,
 346         .s_frame_interval       = call_s_frame_interval,
 347 };
 348
 349 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
 350         .pad    = &v4l2_subdev_call_pad_wrappers,
 351         .video  = &v4l2_subdev_call_video_wrappers,
 352 };
 353 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
 354
 355 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 356 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 357 {
 358         struct video_device *vdev = video_devdata(file);
 359         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 360         struct v4l2_fh *vfh = file->private_data;
 361         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 362         bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
 363         int rval;
 364
 365         switch (cmd) {
 366         case VIDIOC_SUBDEV_QUERYCAP: {
 367                 struct v4l2_subdev_capability *cap = arg;
 368
 369                 memset(cap->reserved, 0, sizeof(cap->reserved));
 370                 cap->version = LINUX_VERSION_CODE;
 371                 cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
 372
 373                 return 0;
 374         }
 375
 376         case VIDIOC_QUERYCTRL:
 377                 /*
 378                  * TODO: this really should be folded into v4l2_queryctrl (this
 379                  * currently returns -EINVAL for NULL control handlers).
 380                  * However, v4l2_queryctrl() is still called directly by
 381                  * drivers as well and until that has been addressed I believe
 382                  * it is safer to do the check here. The same is true for the
 383                  * other control ioctls below.
 384                  */
 385                 if (!vfh->ctrl_handler)
 386                         return -ENOTTY;
 387                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 388
 389         case VIDIOC_QUERY_EXT_CTRL:
 390                 if (!vfh->ctrl_handler)
 391                         return -ENOTTY;
 392                 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
 393
 394         case VIDIOC_QUERYMENU:
 395                 if (!vfh->ctrl_handler)
 396                         return -ENOTTY;
 397                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 398
 399         case VIDIOC_G_CTRL:
 400                 if (!vfh->ctrl_handler)
 401                         return -ENOTTY;
 402                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 403
 404         case VIDIOC_S_CTRL:
 405                 if (!vfh->ctrl_handler)
 406                         return -ENOTTY;
 407                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 408
 409         case VIDIOC_G_EXT_CTRLS:
 410                 if (!vfh->ctrl_handler)
 411                         return -ENOTTY;
 412                 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
 413                                         vdev, sd->v4l2_dev->mdev, arg);
 414
 415         case VIDIOC_S_EXT_CTRLS:
 416                 if (!vfh->ctrl_handler)
 417                         return -ENOTTY;
 418                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
 419                                         vdev, sd->v4l2_dev->mdev, arg);
 420
 421         case VIDIOC_TRY_EXT_CTRLS:
 422                 if (!vfh->ctrl_handler)
 423                         return -ENOTTY;
 424                 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
 425                                           vdev, sd->v4l2_dev->mdev, arg);
 426
 427         case VIDIOC_DQEVENT:
 428                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 429                         return -ENOIOCTLCMD;
 430
 431                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 432
 433         case VIDIOC_SUBSCRIBE_EVENT:
 434                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 435
 436         case VIDIOC_UNSUBSCRIBE_EVENT:
 437                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 438
 439 #ifdef CONFIG_VIDEO_ADV_DEBUG
 440         case VIDIOC_DBG_G_REGISTER:
 441         {
 442                 struct v4l2_dbg_register *p = arg;
 443
 444                 if (!capable(CAP_SYS_ADMIN))
 445                         return -EPERM;
 446                 return v4l2_subdev_call(sd, core, g_register, p);
 447         }
 448         case VIDIOC_DBG_S_REGISTER:
 449         {
 450                 struct v4l2_dbg_register *p = arg;
 451
 452                 if (!capable(CAP_SYS_ADMIN))
 453                         return -EPERM;
 454                 return v4l2_subdev_call(sd, core, s_register, p);
 455         }
 456         case VIDIOC_DBG_G_CHIP_INFO:
 457         {
 458                 struct v4l2_dbg_chip_info *p = arg;
 459
 460                 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
 461                         return -EINVAL;
 462                 if (sd->ops->core && sd->ops->core->s_register)
 463                         p->flags |= V4L2_CHIP_FL_WRITABLE;
 464                 if (sd->ops->core && sd->ops->core->g_register)
 465                         p->flags |= V4L2_CHIP_FL_READABLE;
 466                 strscpy(p->name, sd->name, sizeof(p->name));
 467                 return 0;
 468         }
 469 #endif
 470
 471         case VIDIOC_LOG_STATUS: {
 472                 int ret;
 473
 474                 pr_info("%s: =================  START STATUS  =================\n",
 475                         sd->name);
 476                 ret = v4l2_subdev_call(sd, core, log_status);
 477                 pr_info("%s: ==================  END STATUS  ==================\n",
 478                         sd->name);
 479                 return ret;
 480         }
 481
 482         case VIDIOC_SUBDEV_G_FMT: {
 483                 struct v4l2_subdev_format *format = arg;
 484
 485                 memset(format->reserved, 0, sizeof(format->reserved));
 486                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 487                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->state, format);
 488         }
 489
 490         case VIDIOC_SUBDEV_S_FMT: {
 491                 struct v4l2_subdev_format *format = arg;
 492
 493                 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 494                         return -EPERM;
 495
 496                 memset(format->reserved, 0, sizeof(format->reserved));
 497                 memset(format->format.reserved, 0, sizeof(format->format.reserved));
 498                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->state, format);
 499         }
 500
 501         case VIDIOC_SUBDEV_G_CROP: {
 502                 struct v4l2_subdev_crop *crop = arg;
 503                 struct v4l2_subdev_selection sel;
 504
 505                 memset(crop->reserved, 0, sizeof(crop->reserved));
 506                 memset(&sel, 0, sizeof(sel));
 507                 sel.which = crop->which;
 508                 sel.pad = crop->pad;
 509                 sel.target = V4L2_SEL_TGT_CROP;
 510
 511                 rval = v4l2_subdev_call(
 512                         sd, pad, get_selection, subdev_fh->state, &sel);
 513
 514                 crop->rect = sel.r;
 515
 516                 return rval;
 517         }
 518
 519         case VIDIOC_SUBDEV_S_CROP: {
 520                 struct v4l2_subdev_crop *crop = arg;
 521                 struct v4l2_subdev_selection sel;
 522
 523                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 524                         return -EPERM;
 525
 526                 memset(crop->reserved, 0, sizeof(crop->reserved));
 527                 memset(&sel, 0, sizeof(sel));
 528                 sel.which = crop->which;
 529                 sel.pad = crop->pad;
 530                 sel.target = V4L2_SEL_TGT_CROP;
 531                 sel.r = crop->rect;
 532
 533                 rval = v4l2_subdev_call(
 534                         sd, pad, set_selection, subdev_fh->state, &sel);
 535
 536                 crop->rect = sel.r;
 537
 538                 return rval;
 539         }
 540
 541         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 542                 struct v4l2_subdev_mbus_code_enum *code = arg;
 543
 544                 memset(code->reserved, 0, sizeof(code->reserved));
 545                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->state,
 546                                         code);
 547         }
 548
 549         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 550                 struct v4l2_subdev_frame_size_enum *fse = arg;
 551
 552                 memset(fse->reserved, 0, sizeof(fse->reserved));
 553                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->state,
 554                                         fse);
 555         }
 556
 557         case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
 558                 struct v4l2_subdev_frame_interval *fi = arg;
 559
 560                 memset(fi->reserved, 0, sizeof(fi->reserved));
 561                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 562         }
 563
 564         case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
 565                 struct v4l2_subdev_frame_interval *fi = arg;
 566
 567                 if (ro_subdev)
 568                         return -EPERM;
 569
 570                 memset(fi->reserved, 0, sizeof(fi->reserved));
 571                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 572         }
 573
 574         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 575                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 576
 577                 memset(fie->reserved, 0, sizeof(fie->reserved));
 578                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->state,
 579                                         fie);
 580         }
 581
 582         case VIDIOC_SUBDEV_G_SELECTION: {
 583                 struct v4l2_subdev_selection *sel = arg;
 584
 585                 memset(sel->reserved, 0, sizeof(sel->reserved));
 586                 return v4l2_subdev_call(
 587                         sd, pad, get_selection, subdev_fh->state, sel);
 588         }
 589
 590         case VIDIOC_SUBDEV_S_SELECTION: {
 591                 struct v4l2_subdev_selection *sel = arg;
 592
 593                 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
 594                         return -EPERM;
 595
 596                 memset(sel->reserved, 0, sizeof(sel->reserved));
 597                 return v4l2_subdev_call(
 598                         sd, pad, set_selection, subdev_fh->state, sel);
 599         }
 600
 601         case VIDIOC_G_EDID: {
 602                 struct v4l2_subdev_edid *edid = arg;
 603
 604                 return v4l2_subdev_call(sd, pad, get_edid, edid);
 605         }
 606
 607         case VIDIOC_S_EDID: {
 608                 struct v4l2_subdev_edid *edid = arg;
 609
 610                 return v4l2_subdev_call(sd, pad, set_edid, edid);
 611         }
 612
 613         case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
 614                 struct v4l2_dv_timings_cap *cap = arg;
 615
 616                 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
 617         }
 618
 619         case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
 620                 struct v4l2_enum_dv_timings *dvt = arg;
 621
 622                 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
 623         }
 624
 625         case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
 626                 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
 627
 628         case VIDIOC_SUBDEV_G_DV_TIMINGS:
 629                 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
 630
 631         case VIDIOC_SUBDEV_S_DV_TIMINGS:
 632                 if (ro_subdev)
 633                         return -EPERM;
 634
 635                 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
 636
 637         case VIDIOC_SUBDEV_G_STD:
 638                 return v4l2_subdev_call(sd, video, g_std, arg);
 639
 640         case VIDIOC_SUBDEV_S_STD: {
 641                 v4l2_std_id *std = arg;
 642
 643                 if (ro_subdev)
 644                         return -EPERM;
 645
 646                 return v4l2_subdev_call(sd, video, s_std, *std);
 647         }
 648
 649         case VIDIOC_SUBDEV_ENUMSTD: {
 650                 struct v4l2_standard *p = arg;
 651                 v4l2_std_id id;
 652
 653                 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
 654                         return -EINVAL;
 655
 656                 return v4l_video_std_enumstd(p, id);
 657         }
 658
 659         case VIDIOC_SUBDEV_QUERYSTD:
 660                 return v4l2_subdev_call(sd, video, querystd, arg);
 661
 662         default:
 663                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 664         }
 665
 666         return 0;
 667 }
 668
 669 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
 670 {
 671         struct video_device *vdev = video_devdata(file);
 672         struct mutex *lock = vdev->lock;
 673         long ret = -ENODEV;
 674
 675         if (lock && mutex_lock_interruptible(lock))
 676                 return -ERESTARTSYS;
 677         if (video_is_registered(vdev))
 678                 ret = subdev_do_ioctl(file, cmd, arg);
 679         if (lock)
 680                 mutex_unlock(lock);
 681         return ret;
 682 }
 683
 684 static long subdev_ioctl(struct file *file, unsigned int cmd,
 685         unsigned long arg)
 686 {
 687         return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
 688 }
 689
 690 #ifdef CONFIG_COMPAT
 691 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 692         unsigned long arg)
 693 {
 694         struct video_device *vdev = video_devdata(file);
 695         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 696
 697         return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
 698 }
 699 #endif
 700
 701 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 702 static long subdev_ioctl(struct file *file, unsigned int cmd,
 703                          unsigned long arg)
 704 {
 705         return -ENODEV;
 706 }
 707
 708 #ifdef CONFIG_COMPAT
 709 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
 710                                   unsigned long arg)
 711 {
 712         return -ENODEV;
 713 }
 714 #endif
 715 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 716
 717 static __poll_t subdev_poll(struct file *file, poll_table *wait)
 718 {
 719         struct video_device *vdev = video_devdata(file);
 720         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 721         struct v4l2_fh *fh = file->private_data;
 722
 723         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 724                 return EPOLLERR;
 725
 726         poll_wait(file, &fh->wait, wait);
 727
 728         if (v4l2_event_pending(fh))
 729                 return EPOLLPRI;
 730
 731         return 0;
 732 }
 733
 734 const struct v4l2_file_operations v4l2_subdev_fops = {
 735         .owner = THIS_MODULE,
 736         .open = subdev_open,
 737         .unlocked_ioctl = subdev_ioctl,
 738 #ifdef CONFIG_COMPAT
 739         .compat_ioctl32 = subdev_compat_ioctl32,
 740 #endif
 741         .release = subdev_close,
 742         .poll = subdev_poll,
 743 };
 744
 745 #ifdef CONFIG_MEDIA_CONTROLLER
 746
 747 int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
 748                                       struct fwnode_endpoint *endpoint)
 749 {
 750         struct fwnode_handle *fwnode;
 751         struct v4l2_subdev *sd;
 752
 753         if (!is_media_entity_v4l2_subdev(entity))
 754                 return -EINVAL;
 755
 756         sd = media_entity_to_v4l2_subdev(entity);
 757
 758         fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
 759         fwnode_handle_put(fwnode);
 760
 761         if (dev_fwnode(sd->dev) == fwnode)
 762                 return endpoint->port;
 763
 764         return -ENXIO;
 765 }
 766 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
 767
 768 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
 769                                       struct media_link *link,
 770                                       struct v4l2_subdev_format *source_fmt,
 771                                       struct v4l2_subdev_format *sink_fmt)
 772 {
 773         bool pass = true;
 774
 775         /* The width, height and code must match. */
 776         if (source_fmt->format.width != sink_fmt->format.width) {
 777                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 778                         "%s: width does not match (source %u, sink %u)\n",
 779                         __func__,
 780                         source_fmt->format.width, sink_fmt->format.width);
 781                 pass = false;
 782         }
 783
 784         if (source_fmt->format.height != sink_fmt->format.height) {
 785                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 786                         "%s: height does not match (source %u, sink %u)\n",
 787                         __func__,
 788                         source_fmt->format.height, sink_fmt->format.height);
 789                 pass = false;
 790         }
 791
 792         if (source_fmt->format.code != sink_fmt->format.code) {
 793                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 794                         "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n",
 795                         __func__,
 796                         source_fmt->format.code, sink_fmt->format.code);
 797                 pass = false;
 798         }
 799
 800         /* The field order must match, or the sink field order must be NONE
 801          * to support interlaced hardware connected to bridges that support
 802          * progressive formats only.
 803          */
 804         if (source_fmt->format.field != sink_fmt->format.field &&
 805             sink_fmt->format.field != V4L2_FIELD_NONE) {
 806                 dev_dbg(sd->entity.graph_obj.mdev->dev,
 807                         "%s: field does not match (source %u, sink %u)\n",
 808                         __func__,
 809                         source_fmt->format.field, sink_fmt->format.field);
 810                 pass = false;
 811         }
 812
 813         if (pass)
 814                 return 0;
 815
 816         dev_dbg(sd->entity.graph_obj.mdev->dev,
 817                 "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__,
 818                 link->source->entity->name, link->source->index,
 819                 link->sink->entity->name, link->sink->index);
 820
 821         return -EPIPE;
 822 }
 823 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
 824
 825 static int
 826 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
 827                                      struct v4l2_subdev_format *fmt)
 828 {
 829         if (is_media_entity_v4l2_subdev(pad->entity)) {
 830                 struct v4l2_subdev *sd =
 831                         media_entity_to_v4l2_subdev(pad->entity);
 832
 833                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
 834                 fmt->pad = pad->index;
 835                 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
 836         }
 837
 838         WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
 839              "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
 840              pad->entity->function, pad->entity->name);
 841
 842         return -EINVAL;
 843 }
 844
 845 int v4l2_subdev_link_validate(struct media_link *link)
 846 {
 847         struct v4l2_subdev *sink;
 848         struct v4l2_subdev_format sink_fmt, source_fmt;
 849         int rval;
 850
 851         rval = v4l2_subdev_link_validate_get_format(
 852                 link->source, &source_fmt);
 853         if (rval < 0)
 854                 return 0;
 855
 856         rval = v4l2_subdev_link_validate_get_format(
 857                 link->sink, &sink_fmt);
 858         if (rval < 0)
 859                 return 0;
 860
 861         sink = media_entity_to_v4l2_subdev(link->sink->entity);
 862
 863         rval = v4l2_subdev_call(sink, pad, link_validate, link,
 864                                 &source_fmt, &sink_fmt);
 865         if (rval != -ENOIOCTLCMD)
 866                 return rval;
 867
 868         return v4l2_subdev_link_validate_default(
 869                 sink, link, &source_fmt, &sink_fmt);
 870 }
 871 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
 872
 873 struct v4l2_subdev_state *v4l2_subdev_alloc_state(struct v4l2_subdev *sd)
 874 {
 875         struct v4l2_subdev_state *state;
 876         int ret;
 877
 878         state = kzalloc(sizeof(*state), GFP_KERNEL);
 879         if (!state)
 880                 return ERR_PTR(-ENOMEM);
 881
 882         if (sd->entity.num_pads) {
 883                 state->pads = kvmalloc_array(sd->entity.num_pads,
 884                                              sizeof(*state->pads),
 885                                              GFP_KERNEL | __GFP_ZERO);
 886                 if (!state->pads) {
 887                         ret = -ENOMEM;
 888                         goto err;
 889                 }
 890         }
 891
 892         ret = v4l2_subdev_call(sd, pad, init_cfg, state);
 893         if (ret < 0 && ret != -ENOIOCTLCMD)
 894                 goto err;
 895
 896         return state;
 897
 898 err:
 899         if (state && state->pads)
 900                 kvfree(state->pads);
 901
 902         kfree(state);
 903
 904         return ERR_PTR(ret);
 905 }
 906 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_state);
 907
 908 void v4l2_subdev_free_state(struct v4l2_subdev_state *state)
 909 {
 910         if (!state)
 911                 return;
 912
 913         kvfree(state->pads);
 914         kfree(state);
 915 }
 916 EXPORT_SYMBOL_GPL(v4l2_subdev_free_state);
 917
 918 #endif /* CONFIG_MEDIA_CONTROLLER */
 919
 920 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 921 {
 922         INIT_LIST_HEAD(&sd->list);
 923         BUG_ON(!ops);
 924         sd->ops = ops;
 925         sd->v4l2_dev = NULL;
 926         sd->flags = 0;
 927         sd->name[0] = '\0';
 928         sd->grp_id = 0;
 929         sd->dev_priv = NULL;
 930         sd->host_priv = NULL;
 931 #if defined(CONFIG_MEDIA_CONTROLLER)
 932         sd->entity.name = sd->name;
 933         sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
 934         sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 935 #endif
 936 }
 937 EXPORT_SYMBOL(v4l2_subdev_init);
 938
 939 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 940                               const struct v4l2_event *ev)
 941 {
 942         v4l2_event_queue(sd->devnode, ev);
 943         v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
 944 }
 945 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);