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 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, &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, &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->pad >= sd->entity.num_pads) 325 return -EINVAL; 326 327 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh, 328 code); 329 } 330 331 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: { 332 struct v4l2_subdev_frame_size_enum *fse = arg; 333 334 if (fse->pad >= sd->entity.num_pads) 335 return -EINVAL; 336 337 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh, 338 fse); 339 } 340 341 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: { 342 struct v4l2_subdev_frame_interval *fi = arg; 343 344 if (fi->pad >= sd->entity.num_pads) 345 return -EINVAL; 346 347 return v4l2_subdev_call(sd, video, g_frame_interval, arg); 348 } 349 350 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: { 351 struct v4l2_subdev_frame_interval *fi = arg; 352 353 if (fi->pad >= sd->entity.num_pads) 354 return -EINVAL; 355 356 return v4l2_subdev_call(sd, video, s_frame_interval, arg); 357 } 358 359 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: { 360 struct v4l2_subdev_frame_interval_enum *fie = arg; 361 362 if (fie->pad >= sd->entity.num_pads) 363 return -EINVAL; 364 365 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh, 366 fie); 367 } 368 369 case VIDIOC_SUBDEV_G_SELECTION: { 370 struct v4l2_subdev_selection *sel = arg; 371 372 rval = check_selection(sd, sel); 373 if (rval) 374 return rval; 375 376 return v4l2_subdev_call( 377 sd, pad, get_selection, subdev_fh, sel); 378 } 379 380 case VIDIOC_SUBDEV_S_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, set_selection, subdev_fh, sel); 389 } 390 391 case VIDIOC_G_EDID: { 392 struct v4l2_subdev_edid *edid = arg; 393 394 rval = check_edid(sd, edid); 395 if (rval) 396 return rval; 397 398 return v4l2_subdev_call(sd, pad, get_edid, edid); 399 } 400 401 case VIDIOC_S_EDID: { 402 struct v4l2_subdev_edid *edid = arg; 403 404 rval = check_edid(sd, edid); 405 if (rval) 406 return rval; 407 408 return v4l2_subdev_call(sd, pad, set_edid, edid); 409 } 410 411 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: { 412 struct v4l2_dv_timings_cap *cap = arg; 413 414 if (cap->pad >= sd->entity.num_pads) 415 return -EINVAL; 416 417 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap); 418 } 419 420 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: { 421 struct v4l2_enum_dv_timings *dvt = arg; 422 423 if (dvt->pad >= sd->entity.num_pads) 424 return -EINVAL; 425 426 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt); 427 } 428 429 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS: 430 return v4l2_subdev_call(sd, video, query_dv_timings, arg); 431 432 case VIDIOC_SUBDEV_G_DV_TIMINGS: 433 return v4l2_subdev_call(sd, video, g_dv_timings, arg); 434 435 case VIDIOC_SUBDEV_S_DV_TIMINGS: 436 return v4l2_subdev_call(sd, video, s_dv_timings, arg); 437 #endif 438 default: 439 return v4l2_subdev_call(sd, core, ioctl, cmd, arg); 440 } 441 442 return 0; 443 } 444 445 static long subdev_ioctl(struct file *file, unsigned int cmd, 446 unsigned long arg) 447 { 448 return video_usercopy(file, cmd, arg, subdev_do_ioctl); 449 } 450 451 #ifdef CONFIG_COMPAT 452 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd, 453 unsigned long arg) 454 { 455 struct video_device *vdev = video_devdata(file); 456 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 457 458 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg); 459 } 460 #endif 461 462 static unsigned int subdev_poll(struct file *file, poll_table *wait) 463 { 464 struct video_device *vdev = video_devdata(file); 465 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); 466 struct v4l2_fh *fh = file->private_data; 467 468 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) 469 return POLLERR; 470 471 poll_wait(file, &fh->wait, wait); 472 473 if (v4l2_event_pending(fh)) 474 return POLLPRI; 475 476 return 0; 477 } 478 479 const struct v4l2_file_operations v4l2_subdev_fops = { 480 .owner = THIS_MODULE, 481 .open = subdev_open, 482 .unlocked_ioctl = subdev_ioctl, 483 #ifdef CONFIG_COMPAT 484 .compat_ioctl32 = subdev_compat_ioctl32, 485 #endif 486 .release = subdev_close, 487 .poll = subdev_poll, 488 }; 489 490 #ifdef CONFIG_MEDIA_CONTROLLER 491 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, 492 struct media_link *link, 493 struct v4l2_subdev_format *source_fmt, 494 struct v4l2_subdev_format *sink_fmt) 495 { 496 /* The width, height and code must match. */ 497 if (source_fmt->format.width != sink_fmt->format.width 498 || source_fmt->format.height != sink_fmt->format.height 499 || source_fmt->format.code != sink_fmt->format.code) 500 return -EINVAL; 501 502 /* The field order must match, or the sink field order must be NONE 503 * to support interlaced hardware connected to bridges that support 504 * progressive formats only. 505 */ 506 if (source_fmt->format.field != sink_fmt->format.field && 507 sink_fmt->format.field != V4L2_FIELD_NONE) 508 return -EINVAL; 509 510 return 0; 511 } 512 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); 513 514 static int 515 v4l2_subdev_link_validate_get_format(struct media_pad *pad, 516 struct v4l2_subdev_format *fmt) 517 { 518 if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) { 519 struct v4l2_subdev *sd = 520 media_entity_to_v4l2_subdev(pad->entity); 521 522 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE; 523 fmt->pad = pad->index; 524 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt); 525 } 526 527 WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L, 528 "Driver bug! Wrong media entity type 0x%08x, entity %s\n", 529 pad->entity->type, pad->entity->name); 530 531 return -EINVAL; 532 } 533 534 int v4l2_subdev_link_validate(struct media_link *link) 535 { 536 struct v4l2_subdev *sink; 537 struct v4l2_subdev_format sink_fmt, source_fmt; 538 int rval; 539 540 rval = v4l2_subdev_link_validate_get_format( 541 link->source, &source_fmt); 542 if (rval < 0) 543 return 0; 544 545 rval = v4l2_subdev_link_validate_get_format( 546 link->sink, &sink_fmt); 547 if (rval < 0) 548 return 0; 549 550 sink = media_entity_to_v4l2_subdev(link->sink->entity); 551 552 rval = v4l2_subdev_call(sink, pad, link_validate, link, 553 &source_fmt, &sink_fmt); 554 if (rval != -ENOIOCTLCMD) 555 return rval; 556 557 return v4l2_subdev_link_validate_default( 558 sink, link, &source_fmt, &sink_fmt); 559 } 560 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); 561 #endif /* CONFIG_MEDIA_CONTROLLER */ 562 563 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) 564 { 565 INIT_LIST_HEAD(&sd->list); 566 BUG_ON(!ops); 567 sd->ops = ops; 568 sd->v4l2_dev = NULL; 569 sd->flags = 0; 570 sd->name[0] = '\0'; 571 sd->grp_id = 0; 572 sd->dev_priv = NULL; 573 sd->host_priv = NULL; 574 #if defined(CONFIG_MEDIA_CONTROLLER) 575 sd->entity.name = sd->name; 576 sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV; 577 #endif 578 } 579 EXPORT_SYMBOL(v4l2_subdev_init); 580