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 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); 946