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_DQEVENT_TIME32: { 434 struct v4l2_event_time32 *ev32 = arg; 435 struct v4l2_event ev = { }; 436 437 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 438 return -ENOIOCTLCMD; 439 440 rval = v4l2_event_dequeue(vfh, &ev, file->f_flags & O_NONBLOCK); 441 442 *ev32 = (struct v4l2_event_time32) { 443 .type = ev.type, 444 .pending = ev.pending, 445 .sequence = ev.sequence, 446 .timestamp.tv_sec = ev.timestamp.tv_sec, 447 .timestamp.tv_nsec = ev.timestamp.tv_nsec, 448 .id = ev.id, 449 }; 450 451 memcpy(&ev32->u, &ev.u, sizeof(ev.u)); 452 memcpy(&ev32->reserved, &ev.reserved, sizeof(ev.reserved)); 453 454 return rval; 455 } 456 457 case VIDIOC_SUBSCRIBE_EVENT: 458 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg); 459 460 case VIDIOC_UNSUBSCRIBE_EVENT: 461 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg); 462 463 #ifdef CONFIG_VIDEO_ADV_DEBUG 464 case VIDIOC_DBG_G_REGISTER: 465 { 466 struct v4l2_dbg_register *p = arg; 467 468 if (!capable(CAP_SYS_ADMIN)) 469 return -EPERM; 470 return v4l2_subdev_call(sd, core, g_register, p); 471 } 472 case VIDIOC_DBG_S_REGISTER: 473 { 474 struct v4l2_dbg_register *p = arg; 475 476 if (!capable(CAP_SYS_ADMIN)) 477 return -EPERM; 478 return v4l2_subdev_call(sd, core, s_register, p); 479 } 480 case VIDIOC_DBG_G_CHIP_INFO: 481 { 482 struct v4l2_dbg_chip_info *p = arg; 483 484 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr) 485 return -EINVAL; 486 if (sd->ops->core && sd->ops->core->s_register) 487 p->flags |= V4L2_CHIP_FL_WRITABLE; 488 if (sd->ops->core && sd->ops->core->g_register) 489 p->flags |= V4L2_CHIP_FL_READABLE; 490 strscpy(p->name, sd->name, sizeof(p->name)); 491 return 0; 492 } 493 #endif 494 495 case VIDIOC_LOG_STATUS: { 496 int ret; 497 498 pr_info("%s: ================= START STATUS =================\n", 499 sd->name); 500 ret = v4l2_subdev_call(sd, core, log_status); 501 pr_info("%s: ================== END STATUS ==================\n", 502 sd->name); 503 return ret; 504 } 505 506 case VIDIOC_SUBDEV_G_FMT: { 507 struct v4l2_subdev_format *format = arg; 508 509 memset(format->reserved, 0, sizeof(format->reserved)); 510 memset(format->format.reserved, 0, sizeof(format->format.reserved)); 511 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->state, format); 512 } 513 514 case VIDIOC_SUBDEV_S_FMT: { 515 struct v4l2_subdev_format *format = arg; 516 517 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) 518 return -EPERM; 519 520 memset(format->reserved, 0, sizeof(format->reserved)); 521 memset(format->format.reserved, 0, sizeof(format->format.reserved)); 522 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->state, format); 523 } 524 525 case VIDIOC_SUBDEV_G_CROP: { 526 struct v4l2_subdev_crop *crop = arg; 527 struct v4l2_subdev_selection sel; 528 529 memset(crop->reserved, 0, sizeof(crop->reserved)); 530 memset(&sel, 0, sizeof(sel)); 531 sel.which = crop->which; 532 sel.pad = crop->pad; 533 sel.target = V4L2_SEL_TGT_CROP; 534 535 rval = v4l2_subdev_call( 536 sd, pad, get_selection, subdev_fh->state, &sel); 537 538 crop->rect = sel.r; 539 540 return rval; 541 } 542 543 case VIDIOC_SUBDEV_S_CROP: { 544 struct v4l2_subdev_crop *crop = arg; 545 struct v4l2_subdev_selection sel; 546 547 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) 548 return -EPERM; 549 550 memset(crop->reserved, 0, sizeof(crop->reserved)); 551 memset(&sel, 0, sizeof(sel)); 552 sel.which = crop->which; 553 sel.pad = crop->pad; 554 sel.target = V4L2_SEL_TGT_CROP; 555 sel.r = crop->rect; 556 557 rval = v4l2_subdev_call( 558 sd, pad, set_selection, subdev_fh->state, &sel); 559 560 crop->rect = sel.r; 561 562 return rval; 563 } 564 565 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: { 566 struct v4l2_subdev_mbus_code_enum *code = arg; 567 568 memset(code->reserved, 0, sizeof(code->reserved)); 569 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->state, 570 code); 571 } 572 573 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: { 574 struct v4l2_subdev_frame_size_enum *fse = arg; 575 576 memset(fse->reserved, 0, sizeof(fse->reserved)); 577 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->state, 578 fse); 579 } 580 581 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: { 582 struct v4l2_subdev_frame_interval *fi = arg; 583 584 memset(fi->reserved, 0, sizeof(fi->reserved)); 585 return v4l2_subdev_call(sd, video, g_frame_interval, arg); 586 } 587 588 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: { 589 struct v4l2_subdev_frame_interval *fi = arg; 590 591 if (ro_subdev) 592 return -EPERM; 593 594 memset(fi->reserved, 0, sizeof(fi->reserved)); 595 return v4l2_subdev_call(sd, video, s_frame_interval, arg); 596 } 597 598 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: { 599 struct v4l2_subdev_frame_interval_enum *fie = arg; 600 601 memset(fie->reserved, 0, sizeof(fie->reserved)); 602 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->state, 603 fie); 604 } 605 606 case VIDIOC_SUBDEV_G_SELECTION: { 607 struct v4l2_subdev_selection *sel = arg; 608 609 memset(sel->reserved, 0, sizeof(sel->reserved)); 610 return v4l2_subdev_call( 611 sd, pad, get_selection, subdev_fh->state, sel); 612 } 613 614 case VIDIOC_SUBDEV_S_SELECTION: { 615 struct v4l2_subdev_selection *sel = arg; 616 617 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) 618 return -EPERM; 619 620 memset(sel->reserved, 0, sizeof(sel->reserved)); 621 return v4l2_subdev_call( 622 sd, pad, set_selection, subdev_fh->state, sel); 623 } 624 625 case VIDIOC_G_EDID: { 626 struct v4l2_subdev_edid *edid = arg; 627 628 return v4l2_subdev_call(sd, pad, get_edid, edid); 629 } 630 631 case VIDIOC_S_EDID: { 632 struct v4l2_subdev_edid *edid = arg; 633 634 return v4l2_subdev_call(sd, pad, set_edid, edid); 635 } 636 637 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: { 638 struct v4l2_dv_timings_cap *cap = arg; 639 640 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap); 641 } 642 643 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: { 644 struct v4l2_enum_dv_timings *dvt = arg; 645 646 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt); 647 } 648 649 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS: 650 return v4l2_subdev_call(sd, video, query_dv_timings, arg); 651 652 case VIDIOC_SUBDEV_G_DV_TIMINGS: 653 return v4l2_subdev_call(sd, video, g_dv_timings, arg); 654 655 case VIDIOC_SUBDEV_S_DV_TIMINGS: 656 if (ro_subdev) 657 return -EPERM; 658 659 return v4l2_subdev_call(sd, video, s_dv_timings, arg); 660 661 case VIDIOC_SUBDEV_G_STD: 662 return v4l2_subdev_call(sd, video, g_std, arg); 663 664 case VIDIOC_SUBDEV_S_STD: { 665 v4l2_std_id *std = arg; 666 667 if (ro_subdev) 668 return -EPERM; 669 670 return v4l2_subdev_call(sd, video, s_std, *std); 671 } 672 673 case VIDIOC_SUBDEV_ENUMSTD: { 674 struct v4l2_standard *p = arg; 675 v4l2_std_id id; 676 677 if (v4l2_subdev_call(sd, video, g_tvnorms, &id)) 678 return -EINVAL; 679 680 return v4l_video_std_enumstd(p, id); 681 } 682 683 case VIDIOC_SUBDEV_QUERYSTD: 684 return v4l2_subdev_call(sd, video, querystd, arg); 685 686 default: 687 return v4l2_subdev_call(sd, core, ioctl, cmd, arg); 688 } 689 690 return 0; 691 } 692 693 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg) 694 { 695 struct video_device *vdev = video_devdata(file); 696 struct mutex *lock = vdev->lock; 697 long ret = -ENODEV; 698 699 if (lock && mutex_lock_interruptible(lock)) 700 return -ERESTARTSYS; 701 if (video_is_registered(vdev)) 702 ret = subdev_do_ioctl(file, cmd, arg); 703 if (lock) 704 mutex_unlock(lock); 705 return ret; 706 } 707 708 static long subdev_ioctl(struct file *file, unsigned int cmd, 709 unsigned long arg) 710 { 711 return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock); 712 } 713 714 #ifdef CONFIG_COMPAT 715 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 716 unsigned long arg) 717 { 718 struct video_device *vdev = video_devdata(file); 719 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 720 721 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg); 722 } 723 #endif 724 725 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */ 726 static long subdev_ioctl(struct file *file, unsigned int cmd, 727 unsigned long arg) 728 { 729 return -ENODEV; 730 } 731 732 #ifdef CONFIG_COMPAT 733 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 734 unsigned long arg) 735 { 736 return -ENODEV; 737 } 738 #endif 739 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */ 740 741 static __poll_t subdev_poll(struct file *file, poll_table *wait) 742 { 743 struct video_device *vdev = video_devdata(file); 744 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 745 struct v4l2_fh *fh = file->private_data; 746 747 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 748 return EPOLLERR; 749 750 poll_wait(file, &fh->wait, wait); 751 752 if (v4l2_event_pending(fh)) 753 return EPOLLPRI; 754 755 return 0; 756 } 757 758 const struct v4l2_file_operations v4l2_subdev_fops = { 759 .owner = THIS_MODULE, 760 .open = subdev_open, 761 .unlocked_ioctl = subdev_ioctl, 762 #ifdef CONFIG_COMPAT 763 .compat_ioctl32 = subdev_compat_ioctl32, 764 #endif 765 .release = subdev_close, 766 .poll = subdev_poll, 767 }; 768 769 #ifdef CONFIG_MEDIA_CONTROLLER 770 771 int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity, 772 struct fwnode_endpoint *endpoint) 773 { 774 struct fwnode_handle *fwnode; 775 struct v4l2_subdev *sd; 776 777 if (!is_media_entity_v4l2_subdev(entity)) 778 return -EINVAL; 779 780 sd = media_entity_to_v4l2_subdev(entity); 781 782 fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode); 783 fwnode_handle_put(fwnode); 784 785 if (dev_fwnode(sd->dev) == fwnode) 786 return endpoint->port; 787 788 return -ENXIO; 789 } 790 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1); 791 792 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, 793 struct media_link *link, 794 struct v4l2_subdev_format *source_fmt, 795 struct v4l2_subdev_format *sink_fmt) 796 { 797 bool pass = true; 798 799 /* The width, height and code must match. */ 800 if (source_fmt->format.width != sink_fmt->format.width) { 801 dev_dbg(sd->entity.graph_obj.mdev->dev, 802 "%s: width does not match (source %u, sink %u)\n", 803 __func__, 804 source_fmt->format.width, sink_fmt->format.width); 805 pass = false; 806 } 807 808 if (source_fmt->format.height != sink_fmt->format.height) { 809 dev_dbg(sd->entity.graph_obj.mdev->dev, 810 "%s: height does not match (source %u, sink %u)\n", 811 __func__, 812 source_fmt->format.height, sink_fmt->format.height); 813 pass = false; 814 } 815 816 if (source_fmt->format.code != sink_fmt->format.code) { 817 dev_dbg(sd->entity.graph_obj.mdev->dev, 818 "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n", 819 __func__, 820 source_fmt->format.code, sink_fmt->format.code); 821 pass = false; 822 } 823 824 /* The field order must match, or the sink field order must be NONE 825 * to support interlaced hardware connected to bridges that support 826 * progressive formats only. 827 */ 828 if (source_fmt->format.field != sink_fmt->format.field && 829 sink_fmt->format.field != V4L2_FIELD_NONE) { 830 dev_dbg(sd->entity.graph_obj.mdev->dev, 831 "%s: field does not match (source %u, sink %u)\n", 832 __func__, 833 source_fmt->format.field, sink_fmt->format.field); 834 pass = false; 835 } 836 837 if (pass) 838 return 0; 839 840 dev_dbg(sd->entity.graph_obj.mdev->dev, 841 "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__, 842 link->source->entity->name, link->source->index, 843 link->sink->entity->name, link->sink->index); 844 845 return -EPIPE; 846 } 847 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); 848 849 static int 850 v4l2_subdev_link_validate_get_format(struct media_pad *pad, 851 struct v4l2_subdev_format *fmt) 852 { 853 if (is_media_entity_v4l2_subdev(pad->entity)) { 854 struct v4l2_subdev *sd = 855 media_entity_to_v4l2_subdev(pad->entity); 856 857 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE; 858 fmt->pad = pad->index; 859 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt); 860 } 861 862 WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L, 863 "Driver bug! Wrong media entity type 0x%08x, entity %s\n", 864 pad->entity->function, pad->entity->name); 865 866 return -EINVAL; 867 } 868 869 int v4l2_subdev_link_validate(struct media_link *link) 870 { 871 struct v4l2_subdev *sink; 872 struct v4l2_subdev_format sink_fmt, source_fmt; 873 int rval; 874 875 rval = v4l2_subdev_link_validate_get_format( 876 link->source, &source_fmt); 877 if (rval < 0) 878 return 0; 879 880 rval = v4l2_subdev_link_validate_get_format( 881 link->sink, &sink_fmt); 882 if (rval < 0) 883 return 0; 884 885 sink = media_entity_to_v4l2_subdev(link->sink->entity); 886 887 rval = v4l2_subdev_call(sink, pad, link_validate, link, 888 &source_fmt, &sink_fmt); 889 if (rval != -ENOIOCTLCMD) 890 return rval; 891 892 return v4l2_subdev_link_validate_default( 893 sink, link, &source_fmt, &sink_fmt); 894 } 895 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); 896 897 struct v4l2_subdev_state *v4l2_subdev_alloc_state(struct v4l2_subdev *sd) 898 { 899 struct v4l2_subdev_state *state; 900 int ret; 901 902 state = kzalloc(sizeof(*state), GFP_KERNEL); 903 if (!state) 904 return ERR_PTR(-ENOMEM); 905 906 if (sd->entity.num_pads) { 907 state->pads = kvmalloc_array(sd->entity.num_pads, 908 sizeof(*state->pads), 909 GFP_KERNEL | __GFP_ZERO); 910 if (!state->pads) { 911 ret = -ENOMEM; 912 goto err; 913 } 914 } 915 916 ret = v4l2_subdev_call(sd, pad, init_cfg, state); 917 if (ret < 0 && ret != -ENOIOCTLCMD) 918 goto err; 919 920 return state; 921 922 err: 923 if (state && state->pads) 924 kvfree(state->pads); 925 926 kfree(state); 927 928 return ERR_PTR(ret); 929 } 930 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_state); 931 932 void v4l2_subdev_free_state(struct v4l2_subdev_state *state) 933 { 934 if (!state) 935 return; 936 937 kvfree(state->pads); 938 kfree(state); 939 } 940 EXPORT_SYMBOL_GPL(v4l2_subdev_free_state); 941 942 #endif /* CONFIG_MEDIA_CONTROLLER */ 943 944 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) 945 { 946 INIT_LIST_HEAD(&sd->list); 947 BUG_ON(!ops); 948 sd->ops = ops; 949 sd->v4l2_dev = NULL; 950 sd->flags = 0; 951 sd->name[0] = '\0'; 952 sd->grp_id = 0; 953 sd->dev_priv = NULL; 954 sd->host_priv = NULL; 955 #if defined(CONFIG_MEDIA_CONTROLLER) 956 sd->entity.name = sd->name; 957 sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV; 958 sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN; 959 #endif 960 } 961 EXPORT_SYMBOL(v4l2_subdev_init); 962 963 void v4l2_subdev_notify_event(struct v4l2_subdev *sd, 964 const struct v4l2_event *ev) 965 { 966 v4l2_event_queue(sd->devnode, ev); 967 v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev); 968 } 969 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event); 970