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 media_entity_put(entity); 97 #endif 98 v4l2_fh_del(&subdev_fh->vfh); 99 v4l2_fh_exit(&subdev_fh->vfh); 100 subdev_fh_free(subdev_fh); 101 kfree(subdev_fh); 102 103 return ret; 104 } 105 106 static int subdev_close(struct file *file) 107 { 108 struct video_device *vdev = video_devdata(file); 109 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 110 struct v4l2_fh *vfh = file->private_data; 111 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); 112 113 if (sd->internal_ops && sd->internal_ops->close) 114 sd->internal_ops->close(sd, subdev_fh); 115 #if defined(CONFIG_MEDIA_CONTROLLER) 116 if (sd->v4l2_dev->mdev) 117 media_entity_put(&sd->entity); 118 #endif 119 v4l2_fh_del(vfh); 120 v4l2_fh_exit(vfh); 121 subdev_fh_free(subdev_fh); 122 kfree(subdev_fh); 123 file->private_data = NULL; 124 125 return 0; 126 } 127 128 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 129 static int check_format(struct v4l2_subdev *sd, 130 struct v4l2_subdev_format *format) 131 { 132 if (format->which != V4L2_SUBDEV_FORMAT_TRY && 133 format->which != V4L2_SUBDEV_FORMAT_ACTIVE) 134 return -EINVAL; 135 136 if (format->pad >= sd->entity.num_pads) 137 return -EINVAL; 138 139 return 0; 140 } 141 142 static int check_crop(struct v4l2_subdev *sd, struct v4l2_subdev_crop *crop) 143 { 144 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && 145 crop->which != V4L2_SUBDEV_FORMAT_ACTIVE) 146 return -EINVAL; 147 148 if (crop->pad >= sd->entity.num_pads) 149 return -EINVAL; 150 151 return 0; 152 } 153 154 static int check_selection(struct v4l2_subdev *sd, 155 struct v4l2_subdev_selection *sel) 156 { 157 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && 158 sel->which != V4L2_SUBDEV_FORMAT_ACTIVE) 159 return -EINVAL; 160 161 if (sel->pad >= sd->entity.num_pads) 162 return -EINVAL; 163 164 return 0; 165 } 166 167 static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid) 168 { 169 if (edid->pad >= sd->entity.num_pads) 170 return -EINVAL; 171 172 if (edid->blocks && edid->edid == NULL) 173 return -EINVAL; 174 175 return 0; 176 } 177 #endif 178 179 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) 180 { 181 struct video_device *vdev = video_devdata(file); 182 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 183 struct v4l2_fh *vfh = file->private_data; 184 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 185 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); 186 int rval; 187 #endif 188 189 switch (cmd) { 190 case VIDIOC_QUERYCTRL: 191 return v4l2_queryctrl(vfh->ctrl_handler, arg); 192 193 case VIDIOC_QUERY_EXT_CTRL: 194 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg); 195 196 case VIDIOC_QUERYMENU: 197 return v4l2_querymenu(vfh->ctrl_handler, arg); 198 199 case VIDIOC_G_CTRL: 200 return v4l2_g_ctrl(vfh->ctrl_handler, arg); 201 202 case VIDIOC_S_CTRL: 203 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg); 204 205 case VIDIOC_G_EXT_CTRLS: 206 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg); 207 208 case VIDIOC_S_EXT_CTRLS: 209 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg); 210 211 case VIDIOC_TRY_EXT_CTRLS: 212 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg); 213 214 case VIDIOC_DQEVENT: 215 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 216 return -ENOIOCTLCMD; 217 218 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK); 219 220 case VIDIOC_SUBSCRIBE_EVENT: 221 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg); 222 223 case VIDIOC_UNSUBSCRIBE_EVENT: 224 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg); 225 226 #ifdef CONFIG_VIDEO_ADV_DEBUG 227 case VIDIOC_DBG_G_REGISTER: 228 { 229 struct v4l2_dbg_register *p = arg; 230 231 if (!capable(CAP_SYS_ADMIN)) 232 return -EPERM; 233 return v4l2_subdev_call(sd, core, g_register, p); 234 } 235 case VIDIOC_DBG_S_REGISTER: 236 { 237 struct v4l2_dbg_register *p = arg; 238 239 if (!capable(CAP_SYS_ADMIN)) 240 return -EPERM; 241 return v4l2_subdev_call(sd, core, s_register, p); 242 } 243 #endif 244 245 case VIDIOC_LOG_STATUS: { 246 int ret; 247 248 pr_info("%s: ================= START STATUS =================\n", 249 sd->name); 250 ret = v4l2_subdev_call(sd, core, log_status); 251 pr_info("%s: ================== END STATUS ==================\n", 252 sd->name); 253 return ret; 254 } 255 256 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) 257 case VIDIOC_SUBDEV_G_FMT: { 258 struct v4l2_subdev_format *format = arg; 259 260 rval = check_format(sd, format); 261 if (rval) 262 return rval; 263 264 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format); 265 } 266 267 case VIDIOC_SUBDEV_S_FMT: { 268 struct v4l2_subdev_format *format = arg; 269 270 rval = check_format(sd, format); 271 if (rval) 272 return rval; 273 274 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format); 275 } 276 277 case VIDIOC_SUBDEV_G_CROP: { 278 struct v4l2_subdev_crop *crop = arg; 279 struct v4l2_subdev_selection sel; 280 281 rval = check_crop(sd, crop); 282 if (rval) 283 return rval; 284 285 memset(&sel, 0, sizeof(sel)); 286 sel.which = crop->which; 287 sel.pad = crop->pad; 288 sel.target = V4L2_SEL_TGT_CROP; 289 290 rval = v4l2_subdev_call( 291 sd, pad, get_selection, subdev_fh->pad, &sel); 292 293 crop->rect = sel.r; 294 295 return rval; 296 } 297 298 case VIDIOC_SUBDEV_S_CROP: { 299 struct v4l2_subdev_crop *crop = arg; 300 struct v4l2_subdev_selection sel; 301 302 rval = check_crop(sd, crop); 303 if (rval) 304 return rval; 305 306 memset(&sel, 0, sizeof(sel)); 307 sel.which = crop->which; 308 sel.pad = crop->pad; 309 sel.target = V4L2_SEL_TGT_CROP; 310 sel.r = crop->rect; 311 312 rval = v4l2_subdev_call( 313 sd, pad, set_selection, subdev_fh->pad, &sel); 314 315 crop->rect = sel.r; 316 317 return rval; 318 } 319 320 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: { 321 struct v4l2_subdev_mbus_code_enum *code = arg; 322 323 if (code->which != V4L2_SUBDEV_FORMAT_TRY && 324 code->which != V4L2_SUBDEV_FORMAT_ACTIVE) 325 return -EINVAL; 326 327 if (code->pad >= sd->entity.num_pads) 328 return -EINVAL; 329 330 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad, 331 code); 332 } 333 334 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: { 335 struct v4l2_subdev_frame_size_enum *fse = arg; 336 337 if (fse->which != V4L2_SUBDEV_FORMAT_TRY && 338 fse->which != V4L2_SUBDEV_FORMAT_ACTIVE) 339 return -EINVAL; 340 341 if (fse->pad >= sd->entity.num_pads) 342 return -EINVAL; 343 344 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad, 345 fse); 346 } 347 348 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: { 349 struct v4l2_subdev_frame_interval *fi = arg; 350 351 if (fi->pad >= sd->entity.num_pads) 352 return -EINVAL; 353 354 return v4l2_subdev_call(sd, video, g_frame_interval, arg); 355 } 356 357 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: { 358 struct v4l2_subdev_frame_interval *fi = arg; 359 360 if (fi->pad >= sd->entity.num_pads) 361 return -EINVAL; 362 363 return v4l2_subdev_call(sd, video, s_frame_interval, arg); 364 } 365 366 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: { 367 struct v4l2_subdev_frame_interval_enum *fie = arg; 368 369 if (fie->which != V4L2_SUBDEV_FORMAT_TRY && 370 fie->which != V4L2_SUBDEV_FORMAT_ACTIVE) 371 return -EINVAL; 372 373 if (fie->pad >= sd->entity.num_pads) 374 return -EINVAL; 375 376 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad, 377 fie); 378 } 379 380 case VIDIOC_SUBDEV_G_SELECTION: { 381 struct v4l2_subdev_selection *sel = arg; 382 383 rval = check_selection(sd, sel); 384 if (rval) 385 return rval; 386 387 return v4l2_subdev_call( 388 sd, pad, get_selection, subdev_fh->pad, sel); 389 } 390 391 case VIDIOC_SUBDEV_S_SELECTION: { 392 struct v4l2_subdev_selection *sel = arg; 393 394 rval = check_selection(sd, sel); 395 if (rval) 396 return rval; 397 398 return v4l2_subdev_call( 399 sd, pad, set_selection, subdev_fh->pad, sel); 400 } 401 402 case VIDIOC_G_EDID: { 403 struct v4l2_subdev_edid *edid = arg; 404 405 rval = check_edid(sd, edid); 406 if (rval) 407 return rval; 408 409 return v4l2_subdev_call(sd, pad, get_edid, edid); 410 } 411 412 case VIDIOC_S_EDID: { 413 struct v4l2_subdev_edid *edid = arg; 414 415 rval = check_edid(sd, edid); 416 if (rval) 417 return rval; 418 419 return v4l2_subdev_call(sd, pad, set_edid, edid); 420 } 421 422 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: { 423 struct v4l2_dv_timings_cap *cap = arg; 424 425 if (cap->pad >= sd->entity.num_pads) 426 return -EINVAL; 427 428 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap); 429 } 430 431 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: { 432 struct v4l2_enum_dv_timings *dvt = arg; 433 434 if (dvt->pad >= sd->entity.num_pads) 435 return -EINVAL; 436 437 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt); 438 } 439 440 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS: 441 return v4l2_subdev_call(sd, video, query_dv_timings, arg); 442 443 case VIDIOC_SUBDEV_G_DV_TIMINGS: 444 return v4l2_subdev_call(sd, video, g_dv_timings, arg); 445 446 case VIDIOC_SUBDEV_S_DV_TIMINGS: 447 return v4l2_subdev_call(sd, video, s_dv_timings, arg); 448 #endif 449 default: 450 return v4l2_subdev_call(sd, core, ioctl, cmd, arg); 451 } 452 453 return 0; 454 } 455 456 static long subdev_ioctl(struct file *file, unsigned int cmd, 457 unsigned long arg) 458 { 459 return video_usercopy(file, cmd, arg, subdev_do_ioctl); 460 } 461 462 #ifdef CONFIG_COMPAT 463 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 464 unsigned long arg) 465 { 466 struct video_device *vdev = video_devdata(file); 467 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 468 469 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg); 470 } 471 #endif 472 473 static unsigned int subdev_poll(struct file *file, poll_table *wait) 474 { 475 struct video_device *vdev = video_devdata(file); 476 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 477 struct v4l2_fh *fh = file->private_data; 478 479 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 480 return POLLERR; 481 482 poll_wait(file, &fh->wait, wait); 483 484 if (v4l2_event_pending(fh)) 485 return POLLPRI; 486 487 return 0; 488 } 489 490 const struct v4l2_file_operations v4l2_subdev_fops = { 491 .owner = THIS_MODULE, 492 .open = subdev_open, 493 .unlocked_ioctl = subdev_ioctl, 494 #ifdef CONFIG_COMPAT 495 .compat_ioctl32 = subdev_compat_ioctl32, 496 #endif 497 .release = subdev_close, 498 .poll = subdev_poll, 499 }; 500 501 #ifdef CONFIG_MEDIA_CONTROLLER 502 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, 503 struct media_link *link, 504 struct v4l2_subdev_format *source_fmt, 505 struct v4l2_subdev_format *sink_fmt) 506 { 507 /* The width, height and code must match. */ 508 if (source_fmt->format.width != sink_fmt->format.width 509 || source_fmt->format.height != sink_fmt->format.height 510 || source_fmt->format.code != sink_fmt->format.code) 511 return -EINVAL; 512 513 /* The field order must match, or the sink field order must be NONE 514 * to support interlaced hardware connected to bridges that support 515 * progressive formats only. 516 */ 517 if (source_fmt->format.field != sink_fmt->format.field && 518 sink_fmt->format.field != V4L2_FIELD_NONE) 519 return -EINVAL; 520 521 return 0; 522 } 523 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); 524 525 static int 526 v4l2_subdev_link_validate_get_format(struct media_pad *pad, 527 struct v4l2_subdev_format *fmt) 528 { 529 if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) { 530 struct v4l2_subdev *sd = 531 media_entity_to_v4l2_subdev(pad->entity); 532 533 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE; 534 fmt->pad = pad->index; 535 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt); 536 } 537 538 WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L, 539 "Driver bug! Wrong media entity type 0x%08x, entity %s\n", 540 pad->entity->type, pad->entity->name); 541 542 return -EINVAL; 543 } 544 545 int v4l2_subdev_link_validate(struct media_link *link) 546 { 547 struct v4l2_subdev *sink; 548 struct v4l2_subdev_format sink_fmt, source_fmt; 549 int rval; 550 551 rval = v4l2_subdev_link_validate_get_format( 552 link->source, &source_fmt); 553 if (rval < 0) 554 return 0; 555 556 rval = v4l2_subdev_link_validate_get_format( 557 link->sink, &sink_fmt); 558 if (rval < 0) 559 return 0; 560 561 sink = media_entity_to_v4l2_subdev(link->sink->entity); 562 563 rval = v4l2_subdev_call(sink, pad, link_validate, link, 564 &source_fmt, &sink_fmt); 565 if (rval != -ENOIOCTLCMD) 566 return rval; 567 568 return v4l2_subdev_link_validate_default( 569 sink, link, &source_fmt, &sink_fmt); 570 } 571 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); 572 #endif /* CONFIG_MEDIA_CONTROLLER */ 573 574 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) 575 { 576 INIT_LIST_HEAD(&sd->list); 577 BUG_ON(!ops); 578 sd->ops = ops; 579 sd->v4l2_dev = NULL; 580 sd->flags = 0; 581 sd->name[0] = '\0'; 582 sd->grp_id = 0; 583 sd->dev_priv = NULL; 584 sd->host_priv = NULL; 585 #if defined(CONFIG_MEDIA_CONTROLLER) 586 sd->entity.name = sd->name; 587 sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV; 588 #endif 589 } 590 EXPORT_SYMBOL(v4l2_subdev_init); 591