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