1 /* 2 * V4L2 sub-device 3 * 4 * Copyright (C) 2010 Nokia Corporation 5 * 6 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> 7 * Sakari Ailus <sakari.ailus@iki.fi> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <linux/ioctl.h> 24 #include <linux/slab.h> 25 #include <linux/types.h> 26 #include <linux/videodev2.h> 27 #include <linux/export.h> 28 29 #include <media/v4l2-ctrls.h> 30 #include <media/v4l2-device.h> 31 #include <media/v4l2-ioctl.h> 32 #include <media/v4l2-fh.h> 33 #include <media/v4l2-event.h> 34 35 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd) 36 { 37 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 38 fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL); 39 if (fh->pad == NULL) 40 return -ENOMEM; 41 #endif 42 return 0; 43 } 44 45 static void subdev_fh_free(struct v4l2_subdev_fh *fh) 46 { 47 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 48 kfree(fh->pad); 49 fh->pad = NULL; 50 #endif 51 } 52 53 static int subdev_open(struct file *file) 54 { 55 struct video_device *vdev = video_devdata(file); 56 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 57 struct v4l2_subdev_fh *subdev_fh; 58 #if defined(CONFIG_MEDIA_CONTROLLER) 59 struct media_entity *entity = NULL; 60 #endif 61 int ret; 62 63 subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL); 64 if (subdev_fh == NULL) 65 return -ENOMEM; 66 67 ret = subdev_fh_init(subdev_fh, sd); 68 if (ret) { 69 kfree(subdev_fh); 70 return ret; 71 } 72 73 v4l2_fh_init(&subdev_fh->vfh, vdev); 74 v4l2_fh_add(&subdev_fh->vfh); 75 file->private_data = &subdev_fh->vfh; 76 #if defined(CONFIG_MEDIA_CONTROLLER) 77 if (sd->v4l2_dev->mdev) { 78 entity = media_entity_get(&sd->entity); 79 if (!entity) { 80 ret = -EBUSY; 81 goto err; 82 } 83 } 84 #endif 85 86 if (sd->internal_ops && sd->internal_ops->open) { 87 ret = sd->internal_ops->open(sd, subdev_fh); 88 if (ret < 0) 89 goto err; 90 } 91 92 return 0; 93 94 err: 95 #if defined(CONFIG_MEDIA_CONTROLLER) 96 if (entity) 97 media_entity_put(entity); 98 #endif 99 v4l2_fh_del(&subdev_fh->vfh); 100 v4l2_fh_exit(&subdev_fh->vfh); 101 subdev_fh_free(subdev_fh); 102 kfree(subdev_fh); 103 104 return ret; 105 } 106 107 static int subdev_close(struct file *file) 108 { 109 struct video_device *vdev = video_devdata(file); 110 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 111 struct v4l2_fh *vfh = file->private_data; 112 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); 113 114 if (sd->internal_ops && sd->internal_ops->close) 115 sd->internal_ops->close(sd, subdev_fh); 116 #if defined(CONFIG_MEDIA_CONTROLLER) 117 if (sd->v4l2_dev->mdev) 118 media_entity_put(&sd->entity); 119 #endif 120 v4l2_fh_del(vfh); 121 v4l2_fh_exit(vfh); 122 subdev_fh_free(subdev_fh); 123 kfree(subdev_fh); 124 file->private_data = NULL; 125 126 return 0; 127 } 128 129 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 130 static int check_format(struct v4l2_subdev *sd, 131 struct v4l2_subdev_format *format) 132 { 133 if (format->which != V4L2_SUBDEV_FORMAT_TRY && 134 format->which != V4L2_SUBDEV_FORMAT_ACTIVE) 135 return -EINVAL; 136 137 if (format->pad >= sd->entity.num_pads) 138 return -EINVAL; 139 140 return 0; 141 } 142 143 static int check_crop(struct v4l2_subdev *sd, struct v4l2_subdev_crop *crop) 144 { 145 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && 146 crop->which != V4L2_SUBDEV_FORMAT_ACTIVE) 147 return -EINVAL; 148 149 if (crop->pad >= sd->entity.num_pads) 150 return -EINVAL; 151 152 return 0; 153 } 154 155 static int check_selection(struct v4l2_subdev *sd, 156 struct v4l2_subdev_selection *sel) 157 { 158 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && 159 sel->which != V4L2_SUBDEV_FORMAT_ACTIVE) 160 return -EINVAL; 161 162 if (sel->pad >= sd->entity.num_pads) 163 return -EINVAL; 164 165 return 0; 166 } 167 168 static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid) 169 { 170 if (edid->pad >= sd->entity.num_pads) 171 return -EINVAL; 172 173 if (edid->blocks && edid->edid == NULL) 174 return -EINVAL; 175 176 return 0; 177 } 178 #endif 179 180 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) 181 { 182 struct video_device *vdev = video_devdata(file); 183 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 184 struct v4l2_fh *vfh = file->private_data; 185 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 186 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); 187 int rval; 188 #endif 189 190 switch (cmd) { 191 case VIDIOC_QUERYCTRL: 192 return v4l2_queryctrl(vfh->ctrl_handler, arg); 193 194 case VIDIOC_QUERY_EXT_CTRL: 195 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg); 196 197 case VIDIOC_QUERYMENU: 198 return v4l2_querymenu(vfh->ctrl_handler, arg); 199 200 case VIDIOC_G_CTRL: 201 return v4l2_g_ctrl(vfh->ctrl_handler, arg); 202 203 case VIDIOC_S_CTRL: 204 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg); 205 206 case VIDIOC_G_EXT_CTRLS: 207 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg); 208 209 case VIDIOC_S_EXT_CTRLS: 210 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg); 211 212 case VIDIOC_TRY_EXT_CTRLS: 213 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg); 214 215 case VIDIOC_DQEVENT: 216 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 217 return -ENOIOCTLCMD; 218 219 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK); 220 221 case VIDIOC_SUBSCRIBE_EVENT: 222 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg); 223 224 case VIDIOC_UNSUBSCRIBE_EVENT: 225 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg); 226 227 #ifdef CONFIG_VIDEO_ADV_DEBUG 228 case VIDIOC_DBG_G_REGISTER: 229 { 230 struct v4l2_dbg_register *p = arg; 231 232 if (!capable(CAP_SYS_ADMIN)) 233 return -EPERM; 234 return v4l2_subdev_call(sd, core, g_register, p); 235 } 236 case VIDIOC_DBG_S_REGISTER: 237 { 238 struct v4l2_dbg_register *p = arg; 239 240 if (!capable(CAP_SYS_ADMIN)) 241 return -EPERM; 242 return v4l2_subdev_call(sd, core, s_register, p); 243 } 244 #endif 245 246 case VIDIOC_LOG_STATUS: { 247 int ret; 248 249 pr_info("%s: ================= START STATUS =================\n", 250 sd->name); 251 ret = v4l2_subdev_call(sd, core, log_status); 252 pr_info("%s: ================== END STATUS ==================\n", 253 sd->name); 254 return ret; 255 } 256 257 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 258 case VIDIOC_SUBDEV_G_FMT: { 259 struct v4l2_subdev_format *format = arg; 260 261 rval = check_format(sd, format); 262 if (rval) 263 return rval; 264 265 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format); 266 } 267 268 case VIDIOC_SUBDEV_S_FMT: { 269 struct v4l2_subdev_format *format = arg; 270 271 rval = check_format(sd, format); 272 if (rval) 273 return rval; 274 275 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format); 276 } 277 278 case VIDIOC_SUBDEV_G_CROP: { 279 struct v4l2_subdev_crop *crop = arg; 280 struct v4l2_subdev_selection sel; 281 282 rval = check_crop(sd, crop); 283 if (rval) 284 return rval; 285 286 memset(&sel, 0, sizeof(sel)); 287 sel.which = crop->which; 288 sel.pad = crop->pad; 289 sel.target = V4L2_SEL_TGT_CROP; 290 291 rval = v4l2_subdev_call( 292 sd, pad, get_selection, subdev_fh->pad, &sel); 293 294 crop->rect = sel.r; 295 296 return rval; 297 } 298 299 case VIDIOC_SUBDEV_S_CROP: { 300 struct v4l2_subdev_crop *crop = arg; 301 struct v4l2_subdev_selection sel; 302 303 rval = check_crop(sd, crop); 304 if (rval) 305 return rval; 306 307 memset(&sel, 0, sizeof(sel)); 308 sel.which = crop->which; 309 sel.pad = crop->pad; 310 sel.target = V4L2_SEL_TGT_CROP; 311 sel.r = crop->rect; 312 313 rval = v4l2_subdev_call( 314 sd, pad, set_selection, subdev_fh->pad, &sel); 315 316 crop->rect = sel.r; 317 318 return rval; 319 } 320 321 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: { 322 struct v4l2_subdev_mbus_code_enum *code = arg; 323 324 if (code->which != V4L2_SUBDEV_FORMAT_TRY && 325 code->which != V4L2_SUBDEV_FORMAT_ACTIVE) 326 return -EINVAL; 327 328 if (code->pad >= sd->entity.num_pads) 329 return -EINVAL; 330 331 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad, 332 code); 333 } 334 335 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: { 336 struct v4l2_subdev_frame_size_enum *fse = arg; 337 338 if (fse->which != V4L2_SUBDEV_FORMAT_TRY && 339 fse->which != V4L2_SUBDEV_FORMAT_ACTIVE) 340 return -EINVAL; 341 342 if (fse->pad >= sd->entity.num_pads) 343 return -EINVAL; 344 345 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad, 346 fse); 347 } 348 349 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: { 350 struct v4l2_subdev_frame_interval *fi = arg; 351 352 if (fi->pad >= sd->entity.num_pads) 353 return -EINVAL; 354 355 return v4l2_subdev_call(sd, video, g_frame_interval, arg); 356 } 357 358 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: { 359 struct v4l2_subdev_frame_interval *fi = arg; 360 361 if (fi->pad >= sd->entity.num_pads) 362 return -EINVAL; 363 364 return v4l2_subdev_call(sd, video, s_frame_interval, arg); 365 } 366 367 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: { 368 struct v4l2_subdev_frame_interval_enum *fie = arg; 369 370 if (fie->which != V4L2_SUBDEV_FORMAT_TRY && 371 fie->which != V4L2_SUBDEV_FORMAT_ACTIVE) 372 return -EINVAL; 373 374 if (fie->pad >= sd->entity.num_pads) 375 return -EINVAL; 376 377 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad, 378 fie); 379 } 380 381 case VIDIOC_SUBDEV_G_SELECTION: { 382 struct v4l2_subdev_selection *sel = arg; 383 384 rval = check_selection(sd, sel); 385 if (rval) 386 return rval; 387 388 return v4l2_subdev_call( 389 sd, pad, get_selection, subdev_fh->pad, sel); 390 } 391 392 case VIDIOC_SUBDEV_S_SELECTION: { 393 struct v4l2_subdev_selection *sel = arg; 394 395 rval = check_selection(sd, sel); 396 if (rval) 397 return rval; 398 399 return v4l2_subdev_call( 400 sd, pad, set_selection, subdev_fh->pad, sel); 401 } 402 403 case VIDIOC_G_EDID: { 404 struct v4l2_subdev_edid *edid = arg; 405 406 rval = check_edid(sd, edid); 407 if (rval) 408 return rval; 409 410 return v4l2_subdev_call(sd, pad, get_edid, edid); 411 } 412 413 case VIDIOC_S_EDID: { 414 struct v4l2_subdev_edid *edid = arg; 415 416 rval = check_edid(sd, edid); 417 if (rval) 418 return rval; 419 420 return v4l2_subdev_call(sd, pad, set_edid, edid); 421 } 422 423 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: { 424 struct v4l2_dv_timings_cap *cap = arg; 425 426 if (cap->pad >= sd->entity.num_pads) 427 return -EINVAL; 428 429 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap); 430 } 431 432 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: { 433 struct v4l2_enum_dv_timings *dvt = arg; 434 435 if (dvt->pad >= sd->entity.num_pads) 436 return -EINVAL; 437 438 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt); 439 } 440 441 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS: 442 return v4l2_subdev_call(sd, video, query_dv_timings, arg); 443 444 case VIDIOC_SUBDEV_G_DV_TIMINGS: 445 return v4l2_subdev_call(sd, video, g_dv_timings, arg); 446 447 case VIDIOC_SUBDEV_S_DV_TIMINGS: 448 return v4l2_subdev_call(sd, video, s_dv_timings, arg); 449 #endif 450 default: 451 return v4l2_subdev_call(sd, core, ioctl, cmd, arg); 452 } 453 454 return 0; 455 } 456 457 static long subdev_ioctl(struct file *file, unsigned int cmd, 458 unsigned long arg) 459 { 460 return video_usercopy(file, cmd, arg, subdev_do_ioctl); 461 } 462 463 #ifdef CONFIG_COMPAT 464 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 465 unsigned long arg) 466 { 467 struct video_device *vdev = video_devdata(file); 468 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 469 470 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg); 471 } 472 #endif 473 474 static unsigned int subdev_poll(struct file *file, poll_table *wait) 475 { 476 struct video_device *vdev = video_devdata(file); 477 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 478 struct v4l2_fh *fh = file->private_data; 479 480 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 481 return POLLERR; 482 483 poll_wait(file, &fh->wait, wait); 484 485 if (v4l2_event_pending(fh)) 486 return POLLPRI; 487 488 return 0; 489 } 490 491 const struct v4l2_file_operations v4l2_subdev_fops = { 492 .owner = THIS_MODULE, 493 .open = subdev_open, 494 .unlocked_ioctl = subdev_ioctl, 495 #ifdef CONFIG_COMPAT 496 .compat_ioctl32 = subdev_compat_ioctl32, 497 #endif 498 .release = subdev_close, 499 .poll = subdev_poll, 500 }; 501 502 #ifdef CONFIG_MEDIA_CONTROLLER 503 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, 504 struct media_link *link, 505 struct v4l2_subdev_format *source_fmt, 506 struct v4l2_subdev_format *sink_fmt) 507 { 508 /* The width, height and code must match. */ 509 if (source_fmt->format.width != sink_fmt->format.width 510 || source_fmt->format.height != sink_fmt->format.height 511 || source_fmt->format.code != sink_fmt->format.code) 512 return -EINVAL; 513 514 /* The field order must match, or the sink field order must be NONE 515 * to support interlaced hardware connected to bridges that support 516 * progressive formats only. 517 */ 518 if (source_fmt->format.field != sink_fmt->format.field && 519 sink_fmt->format.field != V4L2_FIELD_NONE) 520 return -EINVAL; 521 522 return 0; 523 } 524 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); 525 526 static int 527 v4l2_subdev_link_validate_get_format(struct media_pad *pad, 528 struct v4l2_subdev_format *fmt) 529 { 530 if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) { 531 struct v4l2_subdev *sd = 532 media_entity_to_v4l2_subdev(pad->entity); 533 534 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE; 535 fmt->pad = pad->index; 536 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt); 537 } 538 539 WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L, 540 "Driver bug! Wrong media entity type 0x%08x, entity %s\n", 541 pad->entity->type, pad->entity->name); 542 543 return -EINVAL; 544 } 545 546 int v4l2_subdev_link_validate(struct media_link *link) 547 { 548 struct v4l2_subdev *sink; 549 struct v4l2_subdev_format sink_fmt, source_fmt; 550 int rval; 551 552 rval = v4l2_subdev_link_validate_get_format( 553 link->source, &source_fmt); 554 if (rval < 0) 555 return 0; 556 557 rval = v4l2_subdev_link_validate_get_format( 558 link->sink, &sink_fmt); 559 if (rval < 0) 560 return 0; 561 562 sink = media_entity_to_v4l2_subdev(link->sink->entity); 563 564 rval = v4l2_subdev_call(sink, pad, link_validate, link, 565 &source_fmt, &sink_fmt); 566 if (rval != -ENOIOCTLCMD) 567 return rval; 568 569 return v4l2_subdev_link_validate_default( 570 sink, link, &source_fmt, &sink_fmt); 571 } 572 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); 573 #endif /* CONFIG_MEDIA_CONTROLLER */ 574 575 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) 576 { 577 INIT_LIST_HEAD(&sd->list); 578 BUG_ON(!ops); 579 sd->ops = ops; 580 sd->v4l2_dev = NULL; 581 sd->flags = 0; 582 sd->name[0] = '\0'; 583 sd->grp_id = 0; 584 sd->dev_priv = NULL; 585 sd->host_priv = NULL; 586 #if defined(CONFIG_MEDIA_CONTROLLER) 587 sd->entity.name = sd->name; 588 sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV; 589 #endif 590 } 591 EXPORT_SYMBOL(v4l2_subdev_init); 592