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, 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, 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 rval = v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop); 287 if (rval != -ENOIOCTLCMD) 288 return rval; 289 290 memset(&sel, 0, sizeof(sel)); 291 sel.which = crop->which; 292 sel.pad = crop->pad; 293 sel.target = V4L2_SEL_TGT_CROP; 294 295 rval = v4l2_subdev_call( 296 sd, pad, get_selection, subdev_fh, &sel); 297 298 crop->rect = sel.r; 299 300 return rval; 301 } 302 303 case VIDIOC_SUBDEV_S_CROP: { 304 struct v4l2_subdev_crop *crop = arg; 305 struct v4l2_subdev_selection sel; 306 307 rval = check_crop(sd, crop); 308 if (rval) 309 return rval; 310 311 rval = v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop); 312 if (rval != -ENOIOCTLCMD) 313 return rval; 314 315 memset(&sel, 0, sizeof(sel)); 316 sel.which = crop->which; 317 sel.pad = crop->pad; 318 sel.target = V4L2_SEL_TGT_CROP; 319 sel.r = crop->rect; 320 321 rval = v4l2_subdev_call( 322 sd, pad, set_selection, subdev_fh, &sel); 323 324 crop->rect = sel.r; 325 326 return rval; 327 } 328 329 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: { 330 struct v4l2_subdev_mbus_code_enum *code = arg; 331 332 if (code->pad >= sd->entity.num_pads) 333 return -EINVAL; 334 335 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh, 336 code); 337 } 338 339 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: { 340 struct v4l2_subdev_frame_size_enum *fse = arg; 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, 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->pad >= sd->entity.num_pads) 371 return -EINVAL; 372 373 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh, 374 fie); 375 } 376 377 case VIDIOC_SUBDEV_G_SELECTION: { 378 struct v4l2_subdev_selection *sel = arg; 379 380 rval = check_selection(sd, sel); 381 if (rval) 382 return rval; 383 384 return v4l2_subdev_call( 385 sd, pad, get_selection, subdev_fh, sel); 386 } 387 388 case VIDIOC_SUBDEV_S_SELECTION: { 389 struct v4l2_subdev_selection *sel = arg; 390 391 rval = check_selection(sd, sel); 392 if (rval) 393 return rval; 394 395 return v4l2_subdev_call( 396 sd, pad, set_selection, subdev_fh, sel); 397 } 398 399 case VIDIOC_G_EDID: { 400 struct v4l2_subdev_edid *edid = arg; 401 402 rval = check_edid(sd, edid); 403 if (rval) 404 return rval; 405 406 return v4l2_subdev_call(sd, pad, get_edid, edid); 407 } 408 409 case VIDIOC_S_EDID: { 410 struct v4l2_subdev_edid *edid = arg; 411 412 rval = check_edid(sd, edid); 413 if (rval) 414 return rval; 415 416 return v4l2_subdev_call(sd, pad, set_edid, edid); 417 } 418 419 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: { 420 struct v4l2_dv_timings_cap *cap = arg; 421 422 if (cap->pad >= sd->entity.num_pads) 423 return -EINVAL; 424 425 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap); 426 } 427 428 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: { 429 struct v4l2_enum_dv_timings *dvt = arg; 430 431 if (dvt->pad >= sd->entity.num_pads) 432 return -EINVAL; 433 434 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt); 435 } 436 437 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS: 438 return v4l2_subdev_call(sd, video, query_dv_timings, arg); 439 440 case VIDIOC_SUBDEV_G_DV_TIMINGS: 441 return v4l2_subdev_call(sd, video, g_dv_timings, arg); 442 443 case VIDIOC_SUBDEV_S_DV_TIMINGS: 444 return v4l2_subdev_call(sd, video, s_dv_timings, arg); 445 #endif 446 default: 447 return v4l2_subdev_call(sd, core, ioctl, cmd, arg); 448 } 449 450 return 0; 451 } 452 453 static long subdev_ioctl(struct file *file, unsigned int cmd, 454 unsigned long arg) 455 { 456 return video_usercopy(file, cmd, arg, subdev_do_ioctl); 457 } 458 459 #ifdef CONFIG_COMPAT 460 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 461 unsigned long arg) 462 { 463 struct video_device *vdev = video_devdata(file); 464 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 465 466 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg); 467 } 468 #endif 469 470 static unsigned int subdev_poll(struct file *file, poll_table *wait) 471 { 472 struct video_device *vdev = video_devdata(file); 473 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 474 struct v4l2_fh *fh = file->private_data; 475 476 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 477 return POLLERR; 478 479 poll_wait(file, &fh->wait, wait); 480 481 if (v4l2_event_pending(fh)) 482 return POLLPRI; 483 484 return 0; 485 } 486 487 const struct v4l2_file_operations v4l2_subdev_fops = { 488 .owner = THIS_MODULE, 489 .open = subdev_open, 490 .unlocked_ioctl = subdev_ioctl, 491 #ifdef CONFIG_COMPAT 492 .compat_ioctl32 = subdev_compat_ioctl32, 493 #endif 494 .release = subdev_close, 495 .poll = subdev_poll, 496 }; 497 498 #ifdef CONFIG_MEDIA_CONTROLLER 499 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, 500 struct media_link *link, 501 struct v4l2_subdev_format *source_fmt, 502 struct v4l2_subdev_format *sink_fmt) 503 { 504 /* The width, height and code must match. */ 505 if (source_fmt->format.width != sink_fmt->format.width 506 || source_fmt->format.height != sink_fmt->format.height 507 || source_fmt->format.code != sink_fmt->format.code) 508 return -EINVAL; 509 510 /* The field order must match, or the sink field order must be NONE 511 * to support interlaced hardware connected to bridges that support 512 * progressive formats only. 513 */ 514 if (source_fmt->format.field != sink_fmt->format.field && 515 sink_fmt->format.field != V4L2_FIELD_NONE) 516 return -EINVAL; 517 518 return 0; 519 } 520 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); 521 522 static int 523 v4l2_subdev_link_validate_get_format(struct media_pad *pad, 524 struct v4l2_subdev_format *fmt) 525 { 526 if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) { 527 struct v4l2_subdev *sd = 528 media_entity_to_v4l2_subdev(pad->entity); 529 530 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE; 531 fmt->pad = pad->index; 532 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt); 533 } 534 535 WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L, 536 "Driver bug! Wrong media entity type 0x%08x, entity %s\n", 537 pad->entity->type, pad->entity->name); 538 539 return -EINVAL; 540 } 541 542 int v4l2_subdev_link_validate(struct media_link *link) 543 { 544 struct v4l2_subdev *sink; 545 struct v4l2_subdev_format sink_fmt, source_fmt; 546 int rval; 547 548 rval = v4l2_subdev_link_validate_get_format( 549 link->source, &source_fmt); 550 if (rval < 0) 551 return 0; 552 553 rval = v4l2_subdev_link_validate_get_format( 554 link->sink, &sink_fmt); 555 if (rval < 0) 556 return 0; 557 558 sink = media_entity_to_v4l2_subdev(link->sink->entity); 559 560 rval = v4l2_subdev_call(sink, pad, link_validate, link, 561 &source_fmt, &sink_fmt); 562 if (rval != -ENOIOCTLCMD) 563 return rval; 564 565 return v4l2_subdev_link_validate_default( 566 sink, link, &source_fmt, &sink_fmt); 567 } 568 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); 569 #endif /* CONFIG_MEDIA_CONTROLLER */ 570 571 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) 572 { 573 INIT_LIST_HEAD(&sd->list); 574 BUG_ON(!ops); 575 sd->ops = ops; 576 sd->v4l2_dev = NULL; 577 sd->flags = 0; 578 sd->name[0] = '\0'; 579 sd->grp_id = 0; 580 sd->dev_priv = NULL; 581 sd->host_priv = NULL; 582 #if defined(CONFIG_MEDIA_CONTROLLER) 583 sd->entity.name = sd->name; 584 sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV; 585 #endif 586 } 587 EXPORT_SYMBOL(v4l2_subdev_init); 588