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 #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 static struct lock_class_key key; 31 32 state = __v4l2_subdev_state_alloc(sd, "fh->state->lock", &key); 33 if (IS_ERR(state)) 34 return PTR_ERR(state); 35 36 fh->state = state; 37 38 return 0; 39 } 40 41 static void subdev_fh_free(struct v4l2_subdev_fh *fh) 42 { 43 __v4l2_subdev_state_free(fh->state); 44 fh->state = NULL; 45 } 46 47 static int subdev_open(struct file *file) 48 { 49 struct video_device *vdev = video_devdata(file); 50 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 51 struct v4l2_subdev_fh *subdev_fh; 52 int ret; 53 54 subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL); 55 if (subdev_fh == NULL) 56 return -ENOMEM; 57 58 ret = subdev_fh_init(subdev_fh, sd); 59 if (ret) { 60 kfree(subdev_fh); 61 return ret; 62 } 63 64 v4l2_fh_init(&subdev_fh->vfh, vdev); 65 v4l2_fh_add(&subdev_fh->vfh); 66 file->private_data = &subdev_fh->vfh; 67 68 if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) { 69 struct module *owner; 70 71 owner = sd->entity.graph_obj.mdev->dev->driver->owner; 72 if (!try_module_get(owner)) { 73 ret = -EBUSY; 74 goto err; 75 } 76 subdev_fh->owner = owner; 77 } 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_s_stream(struct v4l2_subdev *sd, int enable) 322 { 323 int ret; 324 325 ret = sd->ops->video->s_stream(sd, enable); 326 327 if (!enable && ret < 0) { 328 dev_warn(sd->dev, "disabling streaming failed (%d)\n", ret); 329 return 0; 330 } 331 332 return ret; 333 } 334 335 #ifdef CONFIG_MEDIA_CONTROLLER 336 /* 337 * Create state-management wrapper for pad ops dealing with subdev state. The 338 * wrapper handles the case where the caller does not provide the called 339 * subdev's state. This should be removed when all the callers are fixed. 340 */ 341 #define DEFINE_STATE_WRAPPER(f, arg_type) \ 342 static int call_##f##_state(struct v4l2_subdev *sd, \ 343 struct v4l2_subdev_state *_state, \ 344 arg_type *arg) \ 345 { \ 346 struct v4l2_subdev_state *state = _state; \ 347 int ret; \ 348 if (!_state) \ 349 state = v4l2_subdev_lock_and_get_active_state(sd); \ 350 ret = call_##f(sd, state, arg); \ 351 if (!_state && state) \ 352 v4l2_subdev_unlock_state(state); \ 353 return ret; \ 354 } 355 356 #else /* CONFIG_MEDIA_CONTROLLER */ 357 358 #define DEFINE_STATE_WRAPPER(f, arg_type) \ 359 static int call_##f##_state(struct v4l2_subdev *sd, \ 360 struct v4l2_subdev_state *state, \ 361 arg_type *arg) \ 362 { \ 363 return call_##f(sd, state, arg); \ 364 } 365 366 #endif /* CONFIG_MEDIA_CONTROLLER */ 367 368 DEFINE_STATE_WRAPPER(get_fmt, struct v4l2_subdev_format); 369 DEFINE_STATE_WRAPPER(set_fmt, struct v4l2_subdev_format); 370 DEFINE_STATE_WRAPPER(enum_mbus_code, struct v4l2_subdev_mbus_code_enum); 371 DEFINE_STATE_WRAPPER(enum_frame_size, struct v4l2_subdev_frame_size_enum); 372 DEFINE_STATE_WRAPPER(enum_frame_interval, struct v4l2_subdev_frame_interval_enum); 373 DEFINE_STATE_WRAPPER(get_selection, struct v4l2_subdev_selection); 374 DEFINE_STATE_WRAPPER(set_selection, struct v4l2_subdev_selection); 375 376 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = { 377 .get_fmt = call_get_fmt_state, 378 .set_fmt = call_set_fmt_state, 379 .enum_mbus_code = call_enum_mbus_code_state, 380 .enum_frame_size = call_enum_frame_size_state, 381 .enum_frame_interval = call_enum_frame_interval_state, 382 .get_selection = call_get_selection_state, 383 .set_selection = call_set_selection_state, 384 .get_edid = call_get_edid, 385 .set_edid = call_set_edid, 386 .dv_timings_cap = call_dv_timings_cap, 387 .enum_dv_timings = call_enum_dv_timings, 388 .get_mbus_config = call_get_mbus_config, 389 }; 390 391 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = { 392 .g_frame_interval = call_g_frame_interval, 393 .s_frame_interval = call_s_frame_interval, 394 .s_stream = call_s_stream, 395 }; 396 397 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = { 398 .pad = &v4l2_subdev_call_pad_wrappers, 399 .video = &v4l2_subdev_call_video_wrappers, 400 }; 401 EXPORT_SYMBOL(v4l2_subdev_call_wrappers); 402 403 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 404 405 static struct v4l2_subdev_state * 406 subdev_ioctl_get_state(struct v4l2_subdev *sd, struct v4l2_subdev_fh *subdev_fh, 407 unsigned int cmd, void *arg) 408 { 409 u32 which; 410 411 switch (cmd) { 412 default: 413 return NULL; 414 case VIDIOC_SUBDEV_G_FMT: 415 case VIDIOC_SUBDEV_S_FMT: 416 which = ((struct v4l2_subdev_format *)arg)->which; 417 break; 418 case VIDIOC_SUBDEV_G_CROP: 419 case VIDIOC_SUBDEV_S_CROP: 420 which = ((struct v4l2_subdev_crop *)arg)->which; 421 break; 422 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: 423 which = ((struct v4l2_subdev_mbus_code_enum *)arg)->which; 424 break; 425 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: 426 which = ((struct v4l2_subdev_frame_size_enum *)arg)->which; 427 break; 428 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: 429 which = ((struct v4l2_subdev_frame_interval_enum *)arg)->which; 430 break; 431 case VIDIOC_SUBDEV_G_SELECTION: 432 case VIDIOC_SUBDEV_S_SELECTION: 433 which = ((struct v4l2_subdev_selection *)arg)->which; 434 break; 435 } 436 437 return which == V4L2_SUBDEV_FORMAT_TRY ? 438 subdev_fh->state : 439 v4l2_subdev_get_unlocked_active_state(sd); 440 } 441 442 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg, 443 struct v4l2_subdev_state *state) 444 { 445 struct video_device *vdev = video_devdata(file); 446 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 447 struct v4l2_fh *vfh = file->private_data; 448 bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags); 449 int rval; 450 451 switch (cmd) { 452 case VIDIOC_SUBDEV_QUERYCAP: { 453 struct v4l2_subdev_capability *cap = arg; 454 455 memset(cap->reserved, 0, sizeof(cap->reserved)); 456 cap->version = LINUX_VERSION_CODE; 457 cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0; 458 459 return 0; 460 } 461 462 case VIDIOC_QUERYCTRL: 463 /* 464 * TODO: this really should be folded into v4l2_queryctrl (this 465 * currently returns -EINVAL for NULL control handlers). 466 * However, v4l2_queryctrl() is still called directly by 467 * drivers as well and until that has been addressed I believe 468 * it is safer to do the check here. The same is true for the 469 * other control ioctls below. 470 */ 471 if (!vfh->ctrl_handler) 472 return -ENOTTY; 473 return v4l2_queryctrl(vfh->ctrl_handler, arg); 474 475 case VIDIOC_QUERY_EXT_CTRL: 476 if (!vfh->ctrl_handler) 477 return -ENOTTY; 478 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg); 479 480 case VIDIOC_QUERYMENU: 481 if (!vfh->ctrl_handler) 482 return -ENOTTY; 483 return v4l2_querymenu(vfh->ctrl_handler, arg); 484 485 case VIDIOC_G_CTRL: 486 if (!vfh->ctrl_handler) 487 return -ENOTTY; 488 return v4l2_g_ctrl(vfh->ctrl_handler, arg); 489 490 case VIDIOC_S_CTRL: 491 if (!vfh->ctrl_handler) 492 return -ENOTTY; 493 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg); 494 495 case VIDIOC_G_EXT_CTRLS: 496 if (!vfh->ctrl_handler) 497 return -ENOTTY; 498 return v4l2_g_ext_ctrls(vfh->ctrl_handler, 499 vdev, sd->v4l2_dev->mdev, arg); 500 501 case VIDIOC_S_EXT_CTRLS: 502 if (!vfh->ctrl_handler) 503 return -ENOTTY; 504 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, 505 vdev, sd->v4l2_dev->mdev, arg); 506 507 case VIDIOC_TRY_EXT_CTRLS: 508 if (!vfh->ctrl_handler) 509 return -ENOTTY; 510 return v4l2_try_ext_ctrls(vfh->ctrl_handler, 511 vdev, sd->v4l2_dev->mdev, arg); 512 513 case VIDIOC_DQEVENT: 514 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 515 return -ENOIOCTLCMD; 516 517 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK); 518 519 case VIDIOC_SUBSCRIBE_EVENT: 520 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg); 521 522 case VIDIOC_UNSUBSCRIBE_EVENT: 523 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg); 524 525 #ifdef CONFIG_VIDEO_ADV_DEBUG 526 case VIDIOC_DBG_G_REGISTER: 527 { 528 struct v4l2_dbg_register *p = arg; 529 530 if (!capable(CAP_SYS_ADMIN)) 531 return -EPERM; 532 return v4l2_subdev_call(sd, core, g_register, p); 533 } 534 case VIDIOC_DBG_S_REGISTER: 535 { 536 struct v4l2_dbg_register *p = arg; 537 538 if (!capable(CAP_SYS_ADMIN)) 539 return -EPERM; 540 return v4l2_subdev_call(sd, core, s_register, p); 541 } 542 case VIDIOC_DBG_G_CHIP_INFO: 543 { 544 struct v4l2_dbg_chip_info *p = arg; 545 546 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr) 547 return -EINVAL; 548 if (sd->ops->core && sd->ops->core->s_register) 549 p->flags |= V4L2_CHIP_FL_WRITABLE; 550 if (sd->ops->core && sd->ops->core->g_register) 551 p->flags |= V4L2_CHIP_FL_READABLE; 552 strscpy(p->name, sd->name, sizeof(p->name)); 553 return 0; 554 } 555 #endif 556 557 case VIDIOC_LOG_STATUS: { 558 int ret; 559 560 pr_info("%s: ================= START STATUS =================\n", 561 sd->name); 562 ret = v4l2_subdev_call(sd, core, log_status); 563 pr_info("%s: ================== END STATUS ==================\n", 564 sd->name); 565 return ret; 566 } 567 568 case VIDIOC_SUBDEV_G_FMT: { 569 struct v4l2_subdev_format *format = arg; 570 571 memset(format->reserved, 0, sizeof(format->reserved)); 572 memset(format->format.reserved, 0, sizeof(format->format.reserved)); 573 return v4l2_subdev_call(sd, pad, get_fmt, state, format); 574 } 575 576 case VIDIOC_SUBDEV_S_FMT: { 577 struct v4l2_subdev_format *format = arg; 578 579 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) 580 return -EPERM; 581 582 memset(format->reserved, 0, sizeof(format->reserved)); 583 memset(format->format.reserved, 0, sizeof(format->format.reserved)); 584 return v4l2_subdev_call(sd, pad, set_fmt, state, format); 585 } 586 587 case VIDIOC_SUBDEV_G_CROP: { 588 struct v4l2_subdev_crop *crop = arg; 589 struct v4l2_subdev_selection sel; 590 591 memset(crop->reserved, 0, sizeof(crop->reserved)); 592 memset(&sel, 0, sizeof(sel)); 593 sel.which = crop->which; 594 sel.pad = crop->pad; 595 sel.target = V4L2_SEL_TGT_CROP; 596 597 rval = v4l2_subdev_call( 598 sd, pad, get_selection, state, &sel); 599 600 crop->rect = sel.r; 601 602 return rval; 603 } 604 605 case VIDIOC_SUBDEV_S_CROP: { 606 struct v4l2_subdev_crop *crop = arg; 607 struct v4l2_subdev_selection sel; 608 609 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) 610 return -EPERM; 611 612 memset(crop->reserved, 0, sizeof(crop->reserved)); 613 memset(&sel, 0, sizeof(sel)); 614 sel.which = crop->which; 615 sel.pad = crop->pad; 616 sel.target = V4L2_SEL_TGT_CROP; 617 sel.r = crop->rect; 618 619 rval = v4l2_subdev_call( 620 sd, pad, set_selection, state, &sel); 621 622 crop->rect = sel.r; 623 624 return rval; 625 } 626 627 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: { 628 struct v4l2_subdev_mbus_code_enum *code = arg; 629 630 memset(code->reserved, 0, sizeof(code->reserved)); 631 return v4l2_subdev_call(sd, pad, enum_mbus_code, state, 632 code); 633 } 634 635 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: { 636 struct v4l2_subdev_frame_size_enum *fse = arg; 637 638 memset(fse->reserved, 0, sizeof(fse->reserved)); 639 return v4l2_subdev_call(sd, pad, enum_frame_size, state, 640 fse); 641 } 642 643 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: { 644 struct v4l2_subdev_frame_interval *fi = arg; 645 646 memset(fi->reserved, 0, sizeof(fi->reserved)); 647 return v4l2_subdev_call(sd, video, g_frame_interval, arg); 648 } 649 650 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: { 651 struct v4l2_subdev_frame_interval *fi = arg; 652 653 if (ro_subdev) 654 return -EPERM; 655 656 memset(fi->reserved, 0, sizeof(fi->reserved)); 657 return v4l2_subdev_call(sd, video, s_frame_interval, arg); 658 } 659 660 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: { 661 struct v4l2_subdev_frame_interval_enum *fie = arg; 662 663 memset(fie->reserved, 0, sizeof(fie->reserved)); 664 return v4l2_subdev_call(sd, pad, enum_frame_interval, state, 665 fie); 666 } 667 668 case VIDIOC_SUBDEV_G_SELECTION: { 669 struct v4l2_subdev_selection *sel = arg; 670 671 memset(sel->reserved, 0, sizeof(sel->reserved)); 672 return v4l2_subdev_call( 673 sd, pad, get_selection, state, sel); 674 } 675 676 case VIDIOC_SUBDEV_S_SELECTION: { 677 struct v4l2_subdev_selection *sel = arg; 678 679 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) 680 return -EPERM; 681 682 memset(sel->reserved, 0, sizeof(sel->reserved)); 683 return v4l2_subdev_call( 684 sd, pad, set_selection, state, sel); 685 } 686 687 case VIDIOC_G_EDID: { 688 struct v4l2_subdev_edid *edid = arg; 689 690 return v4l2_subdev_call(sd, pad, get_edid, edid); 691 } 692 693 case VIDIOC_S_EDID: { 694 struct v4l2_subdev_edid *edid = arg; 695 696 return v4l2_subdev_call(sd, pad, set_edid, edid); 697 } 698 699 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: { 700 struct v4l2_dv_timings_cap *cap = arg; 701 702 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap); 703 } 704 705 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: { 706 struct v4l2_enum_dv_timings *dvt = arg; 707 708 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt); 709 } 710 711 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS: 712 return v4l2_subdev_call(sd, video, query_dv_timings, arg); 713 714 case VIDIOC_SUBDEV_G_DV_TIMINGS: 715 return v4l2_subdev_call(sd, video, g_dv_timings, arg); 716 717 case VIDIOC_SUBDEV_S_DV_TIMINGS: 718 if (ro_subdev) 719 return -EPERM; 720 721 return v4l2_subdev_call(sd, video, s_dv_timings, arg); 722 723 case VIDIOC_SUBDEV_G_STD: 724 return v4l2_subdev_call(sd, video, g_std, arg); 725 726 case VIDIOC_SUBDEV_S_STD: { 727 v4l2_std_id *std = arg; 728 729 if (ro_subdev) 730 return -EPERM; 731 732 return v4l2_subdev_call(sd, video, s_std, *std); 733 } 734 735 case VIDIOC_SUBDEV_ENUMSTD: { 736 struct v4l2_standard *p = arg; 737 v4l2_std_id id; 738 739 if (v4l2_subdev_call(sd, video, g_tvnorms, &id)) 740 return -EINVAL; 741 742 return v4l_video_std_enumstd(p, id); 743 } 744 745 case VIDIOC_SUBDEV_QUERYSTD: 746 return v4l2_subdev_call(sd, video, querystd, arg); 747 748 default: 749 return v4l2_subdev_call(sd, core, ioctl, cmd, arg); 750 } 751 752 return 0; 753 } 754 755 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg) 756 { 757 struct video_device *vdev = video_devdata(file); 758 struct mutex *lock = vdev->lock; 759 long ret = -ENODEV; 760 761 if (lock && mutex_lock_interruptible(lock)) 762 return -ERESTARTSYS; 763 764 if (video_is_registered(vdev)) { 765 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 766 struct v4l2_fh *vfh = file->private_data; 767 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); 768 struct v4l2_subdev_state *state; 769 770 state = subdev_ioctl_get_state(sd, subdev_fh, cmd, arg); 771 772 if (state) 773 v4l2_subdev_lock_state(state); 774 775 ret = subdev_do_ioctl(file, cmd, arg, state); 776 777 if (state) 778 v4l2_subdev_unlock_state(state); 779 } 780 781 if (lock) 782 mutex_unlock(lock); 783 return ret; 784 } 785 786 static long subdev_ioctl(struct file *file, unsigned int cmd, 787 unsigned long arg) 788 { 789 return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock); 790 } 791 792 #ifdef CONFIG_COMPAT 793 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 794 unsigned long arg) 795 { 796 struct video_device *vdev = video_devdata(file); 797 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 798 799 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg); 800 } 801 #endif 802 803 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */ 804 static long subdev_ioctl(struct file *file, unsigned int cmd, 805 unsigned long arg) 806 { 807 return -ENODEV; 808 } 809 810 #ifdef CONFIG_COMPAT 811 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 812 unsigned long arg) 813 { 814 return -ENODEV; 815 } 816 #endif 817 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */ 818 819 static __poll_t subdev_poll(struct file *file, poll_table *wait) 820 { 821 struct video_device *vdev = video_devdata(file); 822 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 823 struct v4l2_fh *fh = file->private_data; 824 825 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 826 return EPOLLERR; 827 828 poll_wait(file, &fh->wait, wait); 829 830 if (v4l2_event_pending(fh)) 831 return EPOLLPRI; 832 833 return 0; 834 } 835 836 const struct v4l2_file_operations v4l2_subdev_fops = { 837 .owner = THIS_MODULE, 838 .open = subdev_open, 839 .unlocked_ioctl = subdev_ioctl, 840 #ifdef CONFIG_COMPAT 841 .compat_ioctl32 = subdev_compat_ioctl32, 842 #endif 843 .release = subdev_close, 844 .poll = subdev_poll, 845 }; 846 847 #ifdef CONFIG_MEDIA_CONTROLLER 848 849 int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity, 850 struct fwnode_endpoint *endpoint) 851 { 852 struct fwnode_handle *fwnode; 853 struct v4l2_subdev *sd; 854 855 if (!is_media_entity_v4l2_subdev(entity)) 856 return -EINVAL; 857 858 sd = media_entity_to_v4l2_subdev(entity); 859 860 fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode); 861 fwnode_handle_put(fwnode); 862 863 if (device_match_fwnode(sd->dev, fwnode)) 864 return endpoint->port; 865 866 return -ENXIO; 867 } 868 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1); 869 870 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, 871 struct media_link *link, 872 struct v4l2_subdev_format *source_fmt, 873 struct v4l2_subdev_format *sink_fmt) 874 { 875 bool pass = true; 876 877 /* The width, height and code must match. */ 878 if (source_fmt->format.width != sink_fmt->format.width) { 879 dev_dbg(sd->entity.graph_obj.mdev->dev, 880 "%s: width does not match (source %u, sink %u)\n", 881 __func__, 882 source_fmt->format.width, sink_fmt->format.width); 883 pass = false; 884 } 885 886 if (source_fmt->format.height != sink_fmt->format.height) { 887 dev_dbg(sd->entity.graph_obj.mdev->dev, 888 "%s: height does not match (source %u, sink %u)\n", 889 __func__, 890 source_fmt->format.height, sink_fmt->format.height); 891 pass = false; 892 } 893 894 if (source_fmt->format.code != sink_fmt->format.code) { 895 dev_dbg(sd->entity.graph_obj.mdev->dev, 896 "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n", 897 __func__, 898 source_fmt->format.code, sink_fmt->format.code); 899 pass = false; 900 } 901 902 /* The field order must match, or the sink field order must be NONE 903 * to support interlaced hardware connected to bridges that support 904 * progressive formats only. 905 */ 906 if (source_fmt->format.field != sink_fmt->format.field && 907 sink_fmt->format.field != V4L2_FIELD_NONE) { 908 dev_dbg(sd->entity.graph_obj.mdev->dev, 909 "%s: field does not match (source %u, sink %u)\n", 910 __func__, 911 source_fmt->format.field, sink_fmt->format.field); 912 pass = false; 913 } 914 915 if (pass) 916 return 0; 917 918 dev_dbg(sd->entity.graph_obj.mdev->dev, 919 "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__, 920 link->source->entity->name, link->source->index, 921 link->sink->entity->name, link->sink->index); 922 923 return -EPIPE; 924 } 925 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); 926 927 static int 928 v4l2_subdev_link_validate_get_format(struct media_pad *pad, 929 struct v4l2_subdev_format *fmt) 930 { 931 if (is_media_entity_v4l2_subdev(pad->entity)) { 932 struct v4l2_subdev *sd = 933 media_entity_to_v4l2_subdev(pad->entity); 934 935 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE; 936 fmt->pad = pad->index; 937 return v4l2_subdev_call_state_active(sd, pad, get_fmt, fmt); 938 } 939 940 WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L, 941 "Driver bug! Wrong media entity type 0x%08x, entity %s\n", 942 pad->entity->function, pad->entity->name); 943 944 return -EINVAL; 945 } 946 947 int v4l2_subdev_link_validate(struct media_link *link) 948 { 949 struct v4l2_subdev *sink; 950 struct v4l2_subdev_format sink_fmt, source_fmt; 951 int rval; 952 953 rval = v4l2_subdev_link_validate_get_format( 954 link->source, &source_fmt); 955 if (rval < 0) 956 return 0; 957 958 rval = v4l2_subdev_link_validate_get_format( 959 link->sink, &sink_fmt); 960 if (rval < 0) 961 return 0; 962 963 sink = media_entity_to_v4l2_subdev(link->sink->entity); 964 965 rval = v4l2_subdev_call(sink, pad, link_validate, link, 966 &source_fmt, &sink_fmt); 967 if (rval != -ENOIOCTLCMD) 968 return rval; 969 970 return v4l2_subdev_link_validate_default( 971 sink, link, &source_fmt, &sink_fmt); 972 } 973 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); 974 975 struct v4l2_subdev_state * 976 __v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name, 977 struct lock_class_key *lock_key) 978 { 979 struct v4l2_subdev_state *state; 980 int ret; 981 982 state = kzalloc(sizeof(*state), GFP_KERNEL); 983 if (!state) 984 return ERR_PTR(-ENOMEM); 985 986 __mutex_init(&state->_lock, lock_name, lock_key); 987 if (sd->state_lock) 988 state->lock = sd->state_lock; 989 else 990 state->lock = &state->_lock; 991 992 if (sd->entity.num_pads) { 993 state->pads = kvcalloc(sd->entity.num_pads, 994 sizeof(*state->pads), GFP_KERNEL); 995 if (!state->pads) { 996 ret = -ENOMEM; 997 goto err; 998 } 999 } 1000 1001 /* 1002 * There can be no race at this point, but we lock the state anyway to 1003 * satisfy lockdep checks. 1004 */ 1005 v4l2_subdev_lock_state(state); 1006 ret = v4l2_subdev_call(sd, pad, init_cfg, state); 1007 v4l2_subdev_unlock_state(state); 1008 1009 if (ret < 0 && ret != -ENOIOCTLCMD) 1010 goto err; 1011 1012 return state; 1013 1014 err: 1015 if (state && state->pads) 1016 kvfree(state->pads); 1017 1018 kfree(state); 1019 1020 return ERR_PTR(ret); 1021 } 1022 EXPORT_SYMBOL_GPL(__v4l2_subdev_state_alloc); 1023 1024 void __v4l2_subdev_state_free(struct v4l2_subdev_state *state) 1025 { 1026 if (!state) 1027 return; 1028 1029 mutex_destroy(&state->_lock); 1030 1031 kvfree(state->pads); 1032 kfree(state); 1033 } 1034 EXPORT_SYMBOL_GPL(__v4l2_subdev_state_free); 1035 1036 int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name, 1037 struct lock_class_key *key) 1038 { 1039 struct v4l2_subdev_state *state; 1040 1041 state = __v4l2_subdev_state_alloc(sd, name, key); 1042 if (IS_ERR(state)) 1043 return PTR_ERR(state); 1044 1045 sd->active_state = state; 1046 1047 return 0; 1048 } 1049 EXPORT_SYMBOL_GPL(__v4l2_subdev_init_finalize); 1050 1051 void v4l2_subdev_cleanup(struct v4l2_subdev *sd) 1052 { 1053 __v4l2_subdev_state_free(sd->active_state); 1054 sd->active_state = NULL; 1055 } 1056 EXPORT_SYMBOL_GPL(v4l2_subdev_cleanup); 1057 1058 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 1059 1060 int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, 1061 struct v4l2_subdev_format *format) 1062 { 1063 struct v4l2_mbus_framefmt *fmt; 1064 1065 if (format->pad >= sd->entity.num_pads) 1066 return -EINVAL; 1067 1068 fmt = v4l2_subdev_get_pad_format(sd, state, format->pad); 1069 if (!fmt) 1070 return -EINVAL; 1071 1072 format->format = *fmt; 1073 1074 return 0; 1075 } 1076 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt); 1077 1078 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */ 1079 1080 #endif /* CONFIG_MEDIA_CONTROLLER */ 1081 1082 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) 1083 { 1084 INIT_LIST_HEAD(&sd->list); 1085 BUG_ON(!ops); 1086 sd->ops = ops; 1087 sd->v4l2_dev = NULL; 1088 sd->flags = 0; 1089 sd->name[0] = '\0'; 1090 sd->grp_id = 0; 1091 sd->dev_priv = NULL; 1092 sd->host_priv = NULL; 1093 #if defined(CONFIG_MEDIA_CONTROLLER) 1094 sd->entity.name = sd->name; 1095 sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV; 1096 sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN; 1097 #endif 1098 } 1099 EXPORT_SYMBOL(v4l2_subdev_init); 1100 1101 void v4l2_subdev_notify_event(struct v4l2_subdev *sd, 1102 const struct v4l2_event *ev) 1103 { 1104 v4l2_event_queue(sd->devnode, ev); 1105 v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev); 1106 } 1107 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event); 1108