1 /* 2 * videobuf2-v4l2.c - V4L2 driver helper framework 3 * 4 * Copyright (C) 2010 Samsung Electronics 5 * 6 * Author: Pawel Osciak <pawel@osciak.com> 7 * Marek Szyprowski <m.szyprowski@samsung.com> 8 * 9 * The vb2_thread implementation was based on code from videobuf-dvb.c: 10 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation. 15 */ 16 17 #include <linux/device.h> 18 #include <linux/err.h> 19 #include <linux/freezer.h> 20 #include <linux/kernel.h> 21 #include <linux/kthread.h> 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/poll.h> 25 #include <linux/sched.h> 26 #include <linux/slab.h> 27 28 #include <media/v4l2-common.h> 29 #include <media/v4l2-dev.h> 30 #include <media/v4l2-device.h> 31 #include <media/v4l2-event.h> 32 #include <media/v4l2-fh.h> 33 34 #include <media/videobuf2-v4l2.h> 35 36 static int debug; 37 module_param(debug, int, 0644); 38 39 #define dprintk(q, level, fmt, arg...) \ 40 do { \ 41 if (debug >= level) \ 42 pr_info("vb2-v4l2: [%p] %s: " fmt, \ 43 (q)->name, __func__, ## arg); \ 44 } while (0) 45 46 /* Flags that are set by us */ 47 #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ 48 V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ 49 V4L2_BUF_FLAG_PREPARED | \ 50 V4L2_BUF_FLAG_IN_REQUEST | \ 51 V4L2_BUF_FLAG_REQUEST_FD | \ 52 V4L2_BUF_FLAG_TIMESTAMP_MASK) 53 /* Output buffer flags that should be passed on to the driver */ 54 #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | \ 55 V4L2_BUF_FLAG_BFRAME | \ 56 V4L2_BUF_FLAG_KEYFRAME | \ 57 V4L2_BUF_FLAG_TIMECODE | \ 58 V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF) 59 60 /* 61 * __verify_planes_array() - verify that the planes array passed in struct 62 * v4l2_buffer from userspace can be safely used 63 */ 64 static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) 65 { 66 if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) 67 return 0; 68 69 /* Is memory for copying plane information present? */ 70 if (b->m.planes == NULL) { 71 dprintk(vb->vb2_queue, 1, 72 "multi-planar buffer passed but planes array not provided\n"); 73 return -EINVAL; 74 } 75 76 if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) { 77 dprintk(vb->vb2_queue, 1, 78 "incorrect planes array length, expected %d, got %d\n", 79 vb->num_planes, b->length); 80 return -EINVAL; 81 } 82 83 return 0; 84 } 85 86 static int __verify_planes_array_core(struct vb2_buffer *vb, const void *pb) 87 { 88 return __verify_planes_array(vb, pb); 89 } 90 91 /* 92 * __verify_length() - Verify that the bytesused value for each plane fits in 93 * the plane length and that the data offset doesn't exceed the bytesused value. 94 */ 95 static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) 96 { 97 unsigned int length; 98 unsigned int bytesused; 99 unsigned int plane; 100 101 if (V4L2_TYPE_IS_CAPTURE(b->type)) 102 return 0; 103 104 if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { 105 for (plane = 0; plane < vb->num_planes; ++plane) { 106 length = (b->memory == VB2_MEMORY_USERPTR || 107 b->memory == VB2_MEMORY_DMABUF) 108 ? b->m.planes[plane].length 109 : vb->planes[plane].length; 110 bytesused = b->m.planes[plane].bytesused 111 ? b->m.planes[plane].bytesused : length; 112 113 if (b->m.planes[plane].bytesused > length) 114 return -EINVAL; 115 116 if (b->m.planes[plane].data_offset > 0 && 117 b->m.planes[plane].data_offset >= bytesused) 118 return -EINVAL; 119 } 120 } else { 121 length = (b->memory == VB2_MEMORY_USERPTR) 122 ? b->length : vb->planes[0].length; 123 124 if (b->bytesused > length) 125 return -EINVAL; 126 } 127 128 return 0; 129 } 130 131 /* 132 * __init_vb2_v4l2_buffer() - initialize the vb2_v4l2_buffer struct 133 */ 134 static void __init_vb2_v4l2_buffer(struct vb2_buffer *vb) 135 { 136 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 137 138 vbuf->request_fd = -1; 139 } 140 141 static void __copy_timestamp(struct vb2_buffer *vb, const void *pb) 142 { 143 const struct v4l2_buffer *b = pb; 144 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 145 struct vb2_queue *q = vb->vb2_queue; 146 147 if (q->is_output) { 148 /* 149 * For output buffers copy the timestamp if needed, 150 * and the timecode field and flag if needed. 151 */ 152 if (q->copy_timestamp) 153 vb->timestamp = v4l2_buffer_get_timestamp(b); 154 vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; 155 if (b->flags & V4L2_BUF_FLAG_TIMECODE) 156 vbuf->timecode = b->timecode; 157 } 158 }; 159 160 static void vb2_warn_zero_bytesused(struct vb2_buffer *vb) 161 { 162 static bool check_once; 163 164 if (check_once) 165 return; 166 167 check_once = true; 168 169 pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n"); 170 if (vb->vb2_queue->allow_zero_bytesused) 171 pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); 172 else 173 pr_warn("use the actual size instead.\n"); 174 } 175 176 static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) 177 { 178 struct vb2_queue *q = vb->vb2_queue; 179 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 180 struct vb2_plane *planes = vbuf->planes; 181 unsigned int plane; 182 int ret; 183 184 ret = __verify_length(vb, b); 185 if (ret < 0) { 186 dprintk(q, 1, "plane parameters verification failed: %d\n", ret); 187 return ret; 188 } 189 if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) { 190 /* 191 * If the format's field is ALTERNATE, then the buffer's field 192 * should be either TOP or BOTTOM, not ALTERNATE since that 193 * makes no sense. The driver has to know whether the 194 * buffer represents a top or a bottom field in order to 195 * program any DMA correctly. Using ALTERNATE is wrong, since 196 * that just says that it is either a top or a bottom field, 197 * but not which of the two it is. 198 */ 199 dprintk(q, 1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); 200 return -EINVAL; 201 } 202 vbuf->sequence = 0; 203 vbuf->request_fd = -1; 204 vbuf->is_held = false; 205 206 if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { 207 switch (b->memory) { 208 case VB2_MEMORY_USERPTR: 209 for (plane = 0; plane < vb->num_planes; ++plane) { 210 planes[plane].m.userptr = 211 b->m.planes[plane].m.userptr; 212 planes[plane].length = 213 b->m.planes[plane].length; 214 } 215 break; 216 case VB2_MEMORY_DMABUF: 217 for (plane = 0; plane < vb->num_planes; ++plane) { 218 planes[plane].m.fd = 219 b->m.planes[plane].m.fd; 220 planes[plane].length = 221 b->m.planes[plane].length; 222 } 223 break; 224 default: 225 for (plane = 0; plane < vb->num_planes; ++plane) { 226 planes[plane].m.offset = 227 vb->planes[plane].m.offset; 228 planes[plane].length = 229 vb->planes[plane].length; 230 } 231 break; 232 } 233 234 /* Fill in driver-provided information for OUTPUT types */ 235 if (V4L2_TYPE_IS_OUTPUT(b->type)) { 236 /* 237 * Will have to go up to b->length when API starts 238 * accepting variable number of planes. 239 * 240 * If bytesused == 0 for the output buffer, then fall 241 * back to the full buffer size. In that case 242 * userspace clearly never bothered to set it and 243 * it's a safe assumption that they really meant to 244 * use the full plane sizes. 245 * 246 * Some drivers, e.g. old codec drivers, use bytesused == 0 247 * as a way to indicate that streaming is finished. 248 * In that case, the driver should use the 249 * allow_zero_bytesused flag to keep old userspace 250 * applications working. 251 */ 252 for (plane = 0; plane < vb->num_planes; ++plane) { 253 struct vb2_plane *pdst = &planes[plane]; 254 struct v4l2_plane *psrc = &b->m.planes[plane]; 255 256 if (psrc->bytesused == 0) 257 vb2_warn_zero_bytesused(vb); 258 259 if (vb->vb2_queue->allow_zero_bytesused) 260 pdst->bytesused = psrc->bytesused; 261 else 262 pdst->bytesused = psrc->bytesused ? 263 psrc->bytesused : pdst->length; 264 pdst->data_offset = psrc->data_offset; 265 } 266 } 267 } else { 268 /* 269 * Single-planar buffers do not use planes array, 270 * so fill in relevant v4l2_buffer struct fields instead. 271 * In vb2 we use our internal V4l2_planes struct for 272 * single-planar buffers as well, for simplicity. 273 * 274 * If bytesused == 0 for the output buffer, then fall back 275 * to the full buffer size as that's a sensible default. 276 * 277 * Some drivers, e.g. old codec drivers, use bytesused == 0 as 278 * a way to indicate that streaming is finished. In that case, 279 * the driver should use the allow_zero_bytesused flag to keep 280 * old userspace applications working. 281 */ 282 switch (b->memory) { 283 case VB2_MEMORY_USERPTR: 284 planes[0].m.userptr = b->m.userptr; 285 planes[0].length = b->length; 286 break; 287 case VB2_MEMORY_DMABUF: 288 planes[0].m.fd = b->m.fd; 289 planes[0].length = b->length; 290 break; 291 default: 292 planes[0].m.offset = vb->planes[0].m.offset; 293 planes[0].length = vb->planes[0].length; 294 break; 295 } 296 297 planes[0].data_offset = 0; 298 if (V4L2_TYPE_IS_OUTPUT(b->type)) { 299 if (b->bytesused == 0) 300 vb2_warn_zero_bytesused(vb); 301 302 if (vb->vb2_queue->allow_zero_bytesused) 303 planes[0].bytesused = b->bytesused; 304 else 305 planes[0].bytesused = b->bytesused ? 306 b->bytesused : planes[0].length; 307 } else 308 planes[0].bytesused = 0; 309 310 } 311 312 /* Zero flags that we handle */ 313 vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; 314 if (!vb->vb2_queue->copy_timestamp || V4L2_TYPE_IS_CAPTURE(b->type)) { 315 /* 316 * Non-COPY timestamps and non-OUTPUT queues will get 317 * their timestamp and timestamp source flags from the 318 * queue. 319 */ 320 vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 321 } 322 323 if (V4L2_TYPE_IS_OUTPUT(b->type)) { 324 /* 325 * For output buffers mask out the timecode flag: 326 * this will be handled later in vb2_qbuf(). 327 * The 'field' is valid metadata for this output buffer 328 * and so that needs to be copied here. 329 */ 330 vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE; 331 vbuf->field = b->field; 332 if (!(q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)) 333 vbuf->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF; 334 } else { 335 /* Zero any output buffer flags as this is a capture buffer */ 336 vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS; 337 /* Zero last flag, this is a signal from driver to userspace */ 338 vbuf->flags &= ~V4L2_BUF_FLAG_LAST; 339 } 340 341 return 0; 342 } 343 344 static void set_buffer_cache_hints(struct vb2_queue *q, 345 struct vb2_buffer *vb, 346 struct v4l2_buffer *b) 347 { 348 if (!vb2_queue_allows_cache_hints(q)) { 349 /* 350 * Clear buffer cache flags if queue does not support user 351 * space hints. That's to indicate to userspace that these 352 * flags won't work. 353 */ 354 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE; 355 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN; 356 return; 357 } 358 359 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE) 360 vb->skip_cache_sync_on_finish = 1; 361 362 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN) 363 vb->skip_cache_sync_on_prepare = 1; 364 } 365 366 static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev, 367 struct vb2_buffer *vb, struct v4l2_buffer *b, 368 bool is_prepare, struct media_request **p_req) 369 { 370 const char *opname = is_prepare ? "prepare_buf" : "qbuf"; 371 struct media_request *req; 372 struct vb2_v4l2_buffer *vbuf; 373 int ret; 374 375 if (b->type != q->type) { 376 dprintk(q, 1, "%s: invalid buffer type\n", opname); 377 return -EINVAL; 378 } 379 380 if (b->memory != q->memory) { 381 dprintk(q, 1, "%s: invalid memory type\n", opname); 382 return -EINVAL; 383 } 384 385 vbuf = to_vb2_v4l2_buffer(vb); 386 ret = __verify_planes_array(vb, b); 387 if (ret) 388 return ret; 389 390 if (!is_prepare && (b->flags & V4L2_BUF_FLAG_REQUEST_FD) && 391 vb->state != VB2_BUF_STATE_DEQUEUED) { 392 dprintk(q, 1, "%s: buffer is not in dequeued state\n", opname); 393 return -EINVAL; 394 } 395 396 if (!vb->prepared) { 397 set_buffer_cache_hints(q, vb, b); 398 /* Copy relevant information provided by the userspace */ 399 memset(vbuf->planes, 0, 400 sizeof(vbuf->planes[0]) * vb->num_planes); 401 ret = vb2_fill_vb2_v4l2_buffer(vb, b); 402 if (ret) 403 return ret; 404 } 405 406 if (is_prepare) 407 return 0; 408 409 if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) { 410 if (q->requires_requests) { 411 dprintk(q, 1, "%s: queue requires requests\n", opname); 412 return -EBADR; 413 } 414 if (q->uses_requests) { 415 dprintk(q, 1, "%s: queue uses requests\n", opname); 416 return -EBUSY; 417 } 418 return 0; 419 } else if (!q->supports_requests) { 420 dprintk(q, 1, "%s: queue does not support requests\n", opname); 421 return -EBADR; 422 } else if (q->uses_qbuf) { 423 dprintk(q, 1, "%s: queue does not use requests\n", opname); 424 return -EBUSY; 425 } 426 427 /* 428 * For proper locking when queueing a request you need to be able 429 * to lock access to the vb2 queue, so check that there is a lock 430 * that we can use. In addition p_req must be non-NULL. 431 */ 432 if (WARN_ON(!q->lock || !p_req)) 433 return -EINVAL; 434 435 /* 436 * Make sure this op is implemented by the driver. It's easy to forget 437 * this callback, but is it important when canceling a buffer in a 438 * queued request. 439 */ 440 if (WARN_ON(!q->ops->buf_request_complete)) 441 return -EINVAL; 442 /* 443 * Make sure this op is implemented by the driver for the output queue. 444 * It's easy to forget this callback, but is it important to correctly 445 * validate the 'field' value at QBUF time. 446 */ 447 if (WARN_ON((q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT || 448 q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) && 449 !q->ops->buf_out_validate)) 450 return -EINVAL; 451 452 req = media_request_get_by_fd(mdev, b->request_fd); 453 if (IS_ERR(req)) { 454 dprintk(q, 1, "%s: invalid request_fd\n", opname); 455 return PTR_ERR(req); 456 } 457 458 /* 459 * Early sanity check. This is checked again when the buffer 460 * is bound to the request in vb2_core_qbuf(). 461 */ 462 if (req->state != MEDIA_REQUEST_STATE_IDLE && 463 req->state != MEDIA_REQUEST_STATE_UPDATING) { 464 dprintk(q, 1, "%s: request is not idle\n", opname); 465 media_request_put(req); 466 return -EBUSY; 467 } 468 469 *p_req = req; 470 vbuf->request_fd = b->request_fd; 471 472 return 0; 473 } 474 475 /* 476 * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be 477 * returned to userspace 478 */ 479 static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb) 480 { 481 struct v4l2_buffer *b = pb; 482 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 483 struct vb2_queue *q = vb->vb2_queue; 484 unsigned int plane; 485 486 /* Copy back data such as timestamp, flags, etc. */ 487 b->index = vb->index; 488 b->type = vb->type; 489 b->memory = vb->memory; 490 b->bytesused = 0; 491 492 b->flags = vbuf->flags; 493 b->field = vbuf->field; 494 v4l2_buffer_set_timestamp(b, vb->timestamp); 495 b->timecode = vbuf->timecode; 496 b->sequence = vbuf->sequence; 497 b->reserved2 = 0; 498 b->request_fd = 0; 499 500 if (q->is_multiplanar) { 501 /* 502 * Fill in plane-related data if userspace provided an array 503 * for it. The caller has already verified memory and size. 504 */ 505 b->length = vb->num_planes; 506 for (plane = 0; plane < vb->num_planes; ++plane) { 507 struct v4l2_plane *pdst = &b->m.planes[plane]; 508 struct vb2_plane *psrc = &vb->planes[plane]; 509 510 pdst->bytesused = psrc->bytesused; 511 pdst->length = psrc->length; 512 if (q->memory == VB2_MEMORY_MMAP) 513 pdst->m.mem_offset = psrc->m.offset; 514 else if (q->memory == VB2_MEMORY_USERPTR) 515 pdst->m.userptr = psrc->m.userptr; 516 else if (q->memory == VB2_MEMORY_DMABUF) 517 pdst->m.fd = psrc->m.fd; 518 pdst->data_offset = psrc->data_offset; 519 memset(pdst->reserved, 0, sizeof(pdst->reserved)); 520 } 521 } else { 522 /* 523 * We use length and offset in v4l2_planes array even for 524 * single-planar buffers, but userspace does not. 525 */ 526 b->length = vb->planes[0].length; 527 b->bytesused = vb->planes[0].bytesused; 528 if (q->memory == VB2_MEMORY_MMAP) 529 b->m.offset = vb->planes[0].m.offset; 530 else if (q->memory == VB2_MEMORY_USERPTR) 531 b->m.userptr = vb->planes[0].m.userptr; 532 else if (q->memory == VB2_MEMORY_DMABUF) 533 b->m.fd = vb->planes[0].m.fd; 534 } 535 536 /* 537 * Clear any buffer state related flags. 538 */ 539 b->flags &= ~V4L2_BUFFER_MASK_FLAGS; 540 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; 541 if (!q->copy_timestamp) { 542 /* 543 * For non-COPY timestamps, drop timestamp source bits 544 * and obtain the timestamp source from the queue. 545 */ 546 b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 547 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 548 } 549 550 switch (vb->state) { 551 case VB2_BUF_STATE_QUEUED: 552 case VB2_BUF_STATE_ACTIVE: 553 b->flags |= V4L2_BUF_FLAG_QUEUED; 554 break; 555 case VB2_BUF_STATE_IN_REQUEST: 556 b->flags |= V4L2_BUF_FLAG_IN_REQUEST; 557 break; 558 case VB2_BUF_STATE_ERROR: 559 b->flags |= V4L2_BUF_FLAG_ERROR; 560 fallthrough; 561 case VB2_BUF_STATE_DONE: 562 b->flags |= V4L2_BUF_FLAG_DONE; 563 break; 564 case VB2_BUF_STATE_PREPARING: 565 case VB2_BUF_STATE_DEQUEUED: 566 /* nothing */ 567 break; 568 } 569 570 if ((vb->state == VB2_BUF_STATE_DEQUEUED || 571 vb->state == VB2_BUF_STATE_IN_REQUEST) && 572 vb->synced && vb->prepared) 573 b->flags |= V4L2_BUF_FLAG_PREPARED; 574 575 if (vb2_buffer_in_use(q, vb)) 576 b->flags |= V4L2_BUF_FLAG_MAPPED; 577 if (vbuf->request_fd >= 0) { 578 b->flags |= V4L2_BUF_FLAG_REQUEST_FD; 579 b->request_fd = vbuf->request_fd; 580 } 581 } 582 583 /* 584 * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a 585 * v4l2_buffer by the userspace. It also verifies that struct 586 * v4l2_buffer has a valid number of planes. 587 */ 588 static int __fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes) 589 { 590 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 591 unsigned int plane; 592 593 if (!vb->vb2_queue->copy_timestamp) 594 vb->timestamp = 0; 595 596 for (plane = 0; plane < vb->num_planes; ++plane) { 597 if (vb->vb2_queue->memory != VB2_MEMORY_MMAP) { 598 planes[plane].m = vbuf->planes[plane].m; 599 planes[plane].length = vbuf->planes[plane].length; 600 } 601 planes[plane].bytesused = vbuf->planes[plane].bytesused; 602 planes[plane].data_offset = vbuf->planes[plane].data_offset; 603 } 604 return 0; 605 } 606 607 static const struct vb2_buf_ops v4l2_buf_ops = { 608 .verify_planes_array = __verify_planes_array_core, 609 .init_buffer = __init_vb2_v4l2_buffer, 610 .fill_user_buffer = __fill_v4l2_buffer, 611 .fill_vb2_buffer = __fill_vb2_buffer, 612 .copy_timestamp = __copy_timestamp, 613 }; 614 615 struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp) 616 { 617 unsigned int i; 618 struct vb2_buffer *vb2; 619 620 /* 621 * This loop doesn't scale if there is a really large number of buffers. 622 * Maybe something more efficient will be needed in this case. 623 */ 624 for (i = 0; i < q->max_num_buffers; i++) { 625 vb2 = vb2_get_buffer(q, i); 626 627 if (!vb2) 628 continue; 629 630 if (vb2->copied_timestamp && 631 vb2->timestamp == timestamp) 632 return vb2; 633 } 634 return NULL; 635 } 636 EXPORT_SYMBOL_GPL(vb2_find_buffer); 637 638 /* 639 * vb2_querybuf() - query video buffer information 640 * @q: vb2 queue 641 * @b: buffer struct passed from userspace to vidioc_querybuf handler 642 * in driver 643 * 644 * Should be called from vidioc_querybuf ioctl handler in driver. 645 * This function will verify the passed v4l2_buffer structure and fill the 646 * relevant information for the userspace. 647 * 648 * The return values from this function are intended to be directly returned 649 * from vidioc_querybuf handler in driver. 650 */ 651 int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) 652 { 653 struct vb2_buffer *vb; 654 int ret; 655 656 if (b->type != q->type) { 657 dprintk(q, 1, "wrong buffer type\n"); 658 return -EINVAL; 659 } 660 661 vb = vb2_get_buffer(q, b->index); 662 if (!vb) { 663 dprintk(q, 1, "can't find the requested buffer %u\n", b->index); 664 return -EINVAL; 665 } 666 667 ret = __verify_planes_array(vb, b); 668 if (!ret) 669 vb2_core_querybuf(q, vb, b); 670 return ret; 671 } 672 EXPORT_SYMBOL(vb2_querybuf); 673 674 static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, 675 u32 *flags, u32 *caps, u32 *max_num_bufs) 676 { 677 if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) { 678 /* 679 * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only, 680 * but in order to avoid bugs we zero out all bits. 681 */ 682 *flags = 0; 683 } else { 684 /* Clear all unknown flags. */ 685 *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; 686 } 687 688 *caps |= V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; 689 if (q->io_modes & VB2_MMAP) 690 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP; 691 if (q->io_modes & VB2_USERPTR) 692 *caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR; 693 if (q->io_modes & VB2_DMABUF) 694 *caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF; 695 if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF) 696 *caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF; 697 if (q->allow_cache_hints && q->io_modes & VB2_MMAP) 698 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; 699 if (q->supports_requests) 700 *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; 701 if (max_num_bufs) { 702 *max_num_bufs = q->max_num_buffers; 703 *caps |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS; 704 } 705 } 706 707 int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) 708 { 709 int ret = vb2_verify_memory_type(q, req->memory, req->type); 710 u32 flags = req->flags; 711 712 vb2_set_flags_and_caps(q, req->memory, &flags, 713 &req->capabilities, NULL); 714 req->flags = flags; 715 return ret ? ret : vb2_core_reqbufs(q, req->memory, 716 req->flags, &req->count); 717 } 718 EXPORT_SYMBOL_GPL(vb2_reqbufs); 719 720 int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, 721 struct v4l2_buffer *b) 722 { 723 struct vb2_buffer *vb; 724 int ret; 725 726 if (vb2_fileio_is_active(q)) { 727 dprintk(q, 1, "file io in progress\n"); 728 return -EBUSY; 729 } 730 731 if (b->flags & V4L2_BUF_FLAG_REQUEST_FD) 732 return -EINVAL; 733 734 vb = vb2_get_buffer(q, b->index); 735 if (!vb) { 736 dprintk(q, 1, "can't find the requested buffer %u\n", b->index); 737 return -EINVAL; 738 } 739 740 ret = vb2_queue_or_prepare_buf(q, mdev, vb, b, true, NULL); 741 742 return ret ? ret : vb2_core_prepare_buf(q, vb, b); 743 } 744 EXPORT_SYMBOL_GPL(vb2_prepare_buf); 745 746 int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) 747 { 748 unsigned requested_planes = 1; 749 unsigned requested_sizes[VIDEO_MAX_PLANES]; 750 struct v4l2_format *f = &create->format; 751 int ret = vb2_verify_memory_type(q, create->memory, f->type); 752 unsigned i; 753 754 create->index = vb2_get_num_buffers(q); 755 vb2_set_flags_and_caps(q, create->memory, &create->flags, 756 &create->capabilities, &create->max_num_buffers); 757 if (create->count == 0) 758 return ret != -EBUSY ? ret : 0; 759 760 switch (f->type) { 761 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: 762 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: 763 requested_planes = f->fmt.pix_mp.num_planes; 764 if (requested_planes == 0 || 765 requested_planes > VIDEO_MAX_PLANES) 766 return -EINVAL; 767 for (i = 0; i < requested_planes; i++) 768 requested_sizes[i] = 769 f->fmt.pix_mp.plane_fmt[i].sizeimage; 770 break; 771 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 772 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 773 requested_sizes[0] = f->fmt.pix.sizeimage; 774 break; 775 case V4L2_BUF_TYPE_VBI_CAPTURE: 776 case V4L2_BUF_TYPE_VBI_OUTPUT: 777 requested_sizes[0] = f->fmt.vbi.samples_per_line * 778 (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]); 779 break; 780 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: 781 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: 782 requested_sizes[0] = f->fmt.sliced.io_size; 783 break; 784 case V4L2_BUF_TYPE_SDR_CAPTURE: 785 case V4L2_BUF_TYPE_SDR_OUTPUT: 786 requested_sizes[0] = f->fmt.sdr.buffersize; 787 break; 788 case V4L2_BUF_TYPE_META_CAPTURE: 789 case V4L2_BUF_TYPE_META_OUTPUT: 790 requested_sizes[0] = f->fmt.meta.buffersize; 791 break; 792 default: 793 return -EINVAL; 794 } 795 for (i = 0; i < requested_planes; i++) 796 if (requested_sizes[i] == 0) 797 return -EINVAL; 798 if (ret) 799 return ret; 800 801 return vb2_core_create_bufs(q, create->memory, 802 create->flags, 803 &create->count, 804 requested_planes, 805 requested_sizes, 806 &create->index); 807 } 808 EXPORT_SYMBOL_GPL(vb2_create_bufs); 809 810 int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev, 811 struct v4l2_buffer *b) 812 { 813 struct media_request *req = NULL; 814 struct vb2_buffer *vb; 815 int ret; 816 817 if (vb2_fileio_is_active(q)) { 818 dprintk(q, 1, "file io in progress\n"); 819 return -EBUSY; 820 } 821 822 vb = vb2_get_buffer(q, b->index); 823 if (!vb) { 824 dprintk(q, 1, "can't find the requested buffer %u\n", b->index); 825 return -EINVAL; 826 } 827 828 ret = vb2_queue_or_prepare_buf(q, mdev, vb, b, false, &req); 829 if (ret) 830 return ret; 831 ret = vb2_core_qbuf(q, vb, b, req); 832 if (req) 833 media_request_put(req); 834 return ret; 835 } 836 EXPORT_SYMBOL_GPL(vb2_qbuf); 837 838 int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) 839 { 840 int ret; 841 842 if (vb2_fileio_is_active(q)) { 843 dprintk(q, 1, "file io in progress\n"); 844 return -EBUSY; 845 } 846 847 if (b->type != q->type) { 848 dprintk(q, 1, "invalid buffer type\n"); 849 return -EINVAL; 850 } 851 852 ret = vb2_core_dqbuf(q, NULL, b, nonblocking); 853 854 if (!q->is_output && 855 b->flags & V4L2_BUF_FLAG_DONE && 856 b->flags & V4L2_BUF_FLAG_LAST) 857 q->last_buffer_dequeued = true; 858 859 /* 860 * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be 861 * cleared. 862 */ 863 b->flags &= ~V4L2_BUF_FLAG_DONE; 864 865 return ret; 866 } 867 EXPORT_SYMBOL_GPL(vb2_dqbuf); 868 869 int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) 870 { 871 if (vb2_fileio_is_active(q)) { 872 dprintk(q, 1, "file io in progress\n"); 873 return -EBUSY; 874 } 875 return vb2_core_streamon(q, type); 876 } 877 EXPORT_SYMBOL_GPL(vb2_streamon); 878 879 int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) 880 { 881 if (vb2_fileio_is_active(q)) { 882 dprintk(q, 1, "file io in progress\n"); 883 return -EBUSY; 884 } 885 return vb2_core_streamoff(q, type); 886 } 887 EXPORT_SYMBOL_GPL(vb2_streamoff); 888 889 int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) 890 { 891 struct vb2_buffer *vb; 892 893 vb = vb2_get_buffer(q, eb->index); 894 if (!vb) { 895 dprintk(q, 1, "can't find the requested buffer %u\n", eb->index); 896 return -EINVAL; 897 } 898 899 return vb2_core_expbuf(q, &eb->fd, eb->type, vb, 900 eb->plane, eb->flags); 901 } 902 EXPORT_SYMBOL_GPL(vb2_expbuf); 903 904 int vb2_queue_init_name(struct vb2_queue *q, const char *name) 905 { 906 /* 907 * Sanity check 908 */ 909 if (WARN_ON(!q) || 910 WARN_ON(q->timestamp_flags & 911 ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | 912 V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) 913 return -EINVAL; 914 915 /* Warn that the driver should choose an appropriate timestamp type */ 916 WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == 917 V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); 918 919 /* Warn that vb2_memory should match with v4l2_memory */ 920 if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP) 921 || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR) 922 || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF)) 923 return -EINVAL; 924 925 if (q->buf_struct_size == 0) 926 q->buf_struct_size = sizeof(struct vb2_v4l2_buffer); 927 928 q->buf_ops = &v4l2_buf_ops; 929 q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); 930 q->is_output = V4L2_TYPE_IS_OUTPUT(q->type); 931 q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) 932 == V4L2_BUF_FLAG_TIMESTAMP_COPY; 933 /* 934 * For compatibility with vb1: if QBUF hasn't been called yet, then 935 * return EPOLLERR as well. This only affects capture queues, output 936 * queues will always initialize waiting_for_buffers to false. 937 */ 938 q->quirk_poll_must_check_waiting_for_buffers = true; 939 940 if (name) 941 strscpy(q->name, name, sizeof(q->name)); 942 else 943 q->name[0] = '\0'; 944 945 return vb2_core_queue_init(q); 946 } 947 EXPORT_SYMBOL_GPL(vb2_queue_init_name); 948 949 int vb2_queue_init(struct vb2_queue *q) 950 { 951 return vb2_queue_init_name(q, NULL); 952 } 953 EXPORT_SYMBOL_GPL(vb2_queue_init); 954 955 void vb2_queue_release(struct vb2_queue *q) 956 { 957 vb2_core_queue_release(q); 958 } 959 EXPORT_SYMBOL_GPL(vb2_queue_release); 960 961 int vb2_queue_change_type(struct vb2_queue *q, unsigned int type) 962 { 963 if (type == q->type) 964 return 0; 965 966 if (vb2_is_busy(q)) 967 return -EBUSY; 968 969 q->type = type; 970 971 return 0; 972 } 973 EXPORT_SYMBOL_GPL(vb2_queue_change_type); 974 975 __poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) 976 { 977 struct video_device *vfd = video_devdata(file); 978 __poll_t res; 979 980 res = vb2_core_poll(q, file, wait); 981 982 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { 983 struct v4l2_fh *fh = file->private_data; 984 985 poll_wait(file, &fh->wait, wait); 986 if (v4l2_event_pending(fh)) 987 res |= EPOLLPRI; 988 } 989 990 return res; 991 } 992 EXPORT_SYMBOL_GPL(vb2_poll); 993 994 /* 995 * The following functions are not part of the vb2 core API, but are helper 996 * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations 997 * and struct vb2_ops. 998 * They contain boilerplate code that most if not all drivers have to do 999 * and so they simplify the driver code. 1000 */ 1001 1002 /* vb2 ioctl helpers */ 1003 1004 int vb2_ioctl_remove_bufs(struct file *file, void *priv, 1005 struct v4l2_remove_buffers *d) 1006 { 1007 struct video_device *vdev = video_devdata(file); 1008 1009 if (vdev->queue->type != d->type) 1010 return -EINVAL; 1011 1012 if (d->count == 0) 1013 return 0; 1014 1015 if (vb2_queue_is_busy(vdev->queue, file)) 1016 return -EBUSY; 1017 1018 return vb2_core_remove_bufs(vdev->queue, d->index, d->count); 1019 } 1020 EXPORT_SYMBOL_GPL(vb2_ioctl_remove_bufs); 1021 1022 int vb2_ioctl_reqbufs(struct file *file, void *priv, 1023 struct v4l2_requestbuffers *p) 1024 { 1025 struct video_device *vdev = video_devdata(file); 1026 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); 1027 u32 flags = p->flags; 1028 1029 vb2_set_flags_and_caps(vdev->queue, p->memory, &flags, 1030 &p->capabilities, NULL); 1031 p->flags = flags; 1032 if (res) 1033 return res; 1034 if (vb2_queue_is_busy(vdev->queue, file)) 1035 return -EBUSY; 1036 res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count); 1037 /* If count == 0, then the owner has released all buffers and he 1038 is no longer owner of the queue. Otherwise we have a new owner. */ 1039 if (res == 0) 1040 vdev->queue->owner = p->count ? file->private_data : NULL; 1041 return res; 1042 } 1043 EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); 1044 1045 int vb2_ioctl_create_bufs(struct file *file, void *priv, 1046 struct v4l2_create_buffers *p) 1047 { 1048 struct video_device *vdev = video_devdata(file); 1049 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->format.type); 1050 1051 p->index = vb2_get_num_buffers(vdev->queue); 1052 vb2_set_flags_and_caps(vdev->queue, p->memory, &p->flags, 1053 &p->capabilities, &p->max_num_buffers); 1054 /* 1055 * If count == 0, then just check if memory and type are valid. 1056 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. 1057 */ 1058 if (p->count == 0) 1059 return res != -EBUSY ? res : 0; 1060 if (res) 1061 return res; 1062 if (vb2_queue_is_busy(vdev->queue, file)) 1063 return -EBUSY; 1064 1065 res = vb2_create_bufs(vdev->queue, p); 1066 if (res == 0) 1067 vdev->queue->owner = file->private_data; 1068 return res; 1069 } 1070 EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); 1071 1072 int vb2_ioctl_prepare_buf(struct file *file, void *priv, 1073 struct v4l2_buffer *p) 1074 { 1075 struct video_device *vdev = video_devdata(file); 1076 1077 if (vb2_queue_is_busy(vdev->queue, file)) 1078 return -EBUSY; 1079 return vb2_prepare_buf(vdev->queue, vdev->v4l2_dev->mdev, p); 1080 } 1081 EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); 1082 1083 int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) 1084 { 1085 struct video_device *vdev = video_devdata(file); 1086 1087 /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ 1088 return vb2_querybuf(vdev->queue, p); 1089 } 1090 EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); 1091 1092 int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) 1093 { 1094 struct video_device *vdev = video_devdata(file); 1095 1096 if (vb2_queue_is_busy(vdev->queue, file)) 1097 return -EBUSY; 1098 return vb2_qbuf(vdev->queue, vdev->v4l2_dev->mdev, p); 1099 } 1100 EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); 1101 1102 int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) 1103 { 1104 struct video_device *vdev = video_devdata(file); 1105 1106 if (vb2_queue_is_busy(vdev->queue, file)) 1107 return -EBUSY; 1108 return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); 1109 } 1110 EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); 1111 1112 int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) 1113 { 1114 struct video_device *vdev = video_devdata(file); 1115 1116 if (vb2_queue_is_busy(vdev->queue, file)) 1117 return -EBUSY; 1118 return vb2_streamon(vdev->queue, i); 1119 } 1120 EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); 1121 1122 int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) 1123 { 1124 struct video_device *vdev = video_devdata(file); 1125 1126 if (vb2_queue_is_busy(vdev->queue, file)) 1127 return -EBUSY; 1128 return vb2_streamoff(vdev->queue, i); 1129 } 1130 EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); 1131 1132 int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) 1133 { 1134 struct video_device *vdev = video_devdata(file); 1135 1136 if (vb2_queue_is_busy(vdev->queue, file)) 1137 return -EBUSY; 1138 return vb2_expbuf(vdev->queue, p); 1139 } 1140 EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); 1141 1142 /* v4l2_file_operations helpers */ 1143 1144 int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) 1145 { 1146 struct video_device *vdev = video_devdata(file); 1147 1148 return vb2_mmap(vdev->queue, vma); 1149 } 1150 EXPORT_SYMBOL_GPL(vb2_fop_mmap); 1151 1152 int _vb2_fop_release(struct file *file, struct mutex *lock) 1153 { 1154 struct video_device *vdev = video_devdata(file); 1155 1156 if (lock) 1157 mutex_lock(lock); 1158 if (!vdev->queue->owner || file->private_data == vdev->queue->owner) { 1159 vb2_queue_release(vdev->queue); 1160 vdev->queue->owner = NULL; 1161 } 1162 if (lock) 1163 mutex_unlock(lock); 1164 return v4l2_fh_release(file); 1165 } 1166 EXPORT_SYMBOL_GPL(_vb2_fop_release); 1167 1168 int vb2_fop_release(struct file *file) 1169 { 1170 struct video_device *vdev = video_devdata(file); 1171 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1172 1173 return _vb2_fop_release(file, lock); 1174 } 1175 EXPORT_SYMBOL_GPL(vb2_fop_release); 1176 1177 ssize_t vb2_fop_write(struct file *file, const char __user *buf, 1178 size_t count, loff_t *ppos) 1179 { 1180 struct video_device *vdev = video_devdata(file); 1181 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1182 int err = -EBUSY; 1183 1184 if (!(vdev->queue->io_modes & VB2_WRITE)) 1185 return -EINVAL; 1186 if (lock && mutex_lock_interruptible(lock)) 1187 return -ERESTARTSYS; 1188 if (vb2_queue_is_busy(vdev->queue, file)) 1189 goto exit; 1190 err = vb2_write(vdev->queue, buf, count, ppos, 1191 file->f_flags & O_NONBLOCK); 1192 if (vdev->queue->fileio) 1193 vdev->queue->owner = file->private_data; 1194 exit: 1195 if (lock) 1196 mutex_unlock(lock); 1197 return err; 1198 } 1199 EXPORT_SYMBOL_GPL(vb2_fop_write); 1200 1201 ssize_t vb2_fop_read(struct file *file, char __user *buf, 1202 size_t count, loff_t *ppos) 1203 { 1204 struct video_device *vdev = video_devdata(file); 1205 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1206 int err = -EBUSY; 1207 1208 if (!(vdev->queue->io_modes & VB2_READ)) 1209 return -EINVAL; 1210 if (lock && mutex_lock_interruptible(lock)) 1211 return -ERESTARTSYS; 1212 if (vb2_queue_is_busy(vdev->queue, file)) 1213 goto exit; 1214 vdev->queue->owner = file->private_data; 1215 err = vb2_read(vdev->queue, buf, count, ppos, 1216 file->f_flags & O_NONBLOCK); 1217 if (!vdev->queue->fileio) 1218 vdev->queue->owner = NULL; 1219 exit: 1220 if (lock) 1221 mutex_unlock(lock); 1222 return err; 1223 } 1224 EXPORT_SYMBOL_GPL(vb2_fop_read); 1225 1226 __poll_t vb2_fop_poll(struct file *file, poll_table *wait) 1227 { 1228 struct video_device *vdev = video_devdata(file); 1229 struct vb2_queue *q = vdev->queue; 1230 struct mutex *lock = q->lock ? q->lock : vdev->lock; 1231 __poll_t res; 1232 void *fileio; 1233 1234 /* 1235 * If this helper doesn't know how to lock, then you shouldn't be using 1236 * it but you should write your own. 1237 */ 1238 WARN_ON(!lock); 1239 1240 if (lock && mutex_lock_interruptible(lock)) 1241 return EPOLLERR; 1242 1243 fileio = q->fileio; 1244 1245 res = vb2_poll(vdev->queue, file, wait); 1246 1247 /* If fileio was started, then we have a new queue owner. */ 1248 if (!fileio && q->fileio) 1249 q->owner = file->private_data; 1250 if (lock) 1251 mutex_unlock(lock); 1252 return res; 1253 } 1254 EXPORT_SYMBOL_GPL(vb2_fop_poll); 1255 1256 #ifndef CONFIG_MMU 1257 unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, 1258 unsigned long len, unsigned long pgoff, unsigned long flags) 1259 { 1260 struct video_device *vdev = video_devdata(file); 1261 1262 return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); 1263 } 1264 EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); 1265 #endif 1266 1267 void vb2_video_unregister_device(struct video_device *vdev) 1268 { 1269 /* Check if vdev was ever registered at all */ 1270 if (!vdev || !video_is_registered(vdev)) 1271 return; 1272 1273 /* 1274 * Calling this function only makes sense if vdev->queue is set. 1275 * If it is NULL, then just call video_unregister_device() instead. 1276 */ 1277 WARN_ON(!vdev->queue); 1278 1279 /* 1280 * Take a reference to the device since video_unregister_device() 1281 * calls device_unregister(), but we don't want that to release 1282 * the device since we want to clean up the queue first. 1283 */ 1284 get_device(&vdev->dev); 1285 video_unregister_device(vdev); 1286 if (vdev->queue) { 1287 struct mutex *lock = vdev->queue->lock ? 1288 vdev->queue->lock : vdev->lock; 1289 1290 if (lock) 1291 mutex_lock(lock); 1292 vb2_queue_release(vdev->queue); 1293 vdev->queue->owner = NULL; 1294 if (lock) 1295 mutex_unlock(lock); 1296 } 1297 /* 1298 * Now we put the device, and in most cases this will release 1299 * everything. 1300 */ 1301 put_device(&vdev->dev); 1302 } 1303 EXPORT_SYMBOL_GPL(vb2_video_unregister_device); 1304 1305 /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ 1306 1307 void vb2_ops_wait_prepare(struct vb2_queue *vq) 1308 { 1309 mutex_unlock(vq->lock); 1310 } 1311 EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); 1312 1313 void vb2_ops_wait_finish(struct vb2_queue *vq) 1314 { 1315 mutex_lock(vq->lock); 1316 } 1317 EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); 1318 1319 /* 1320 * Note that this function is called during validation time and 1321 * thus the req_queue_mutex is held to ensure no request objects 1322 * can be added or deleted while validating. So there is no need 1323 * to protect the objects list. 1324 */ 1325 int vb2_request_validate(struct media_request *req) 1326 { 1327 struct media_request_object *obj; 1328 int ret = 0; 1329 1330 if (!vb2_request_buffer_cnt(req)) 1331 return -ENOENT; 1332 1333 list_for_each_entry(obj, &req->objects, list) { 1334 if (!obj->ops->prepare) 1335 continue; 1336 1337 ret = obj->ops->prepare(obj); 1338 if (ret) 1339 break; 1340 } 1341 1342 if (ret) { 1343 list_for_each_entry_continue_reverse(obj, &req->objects, list) 1344 if (obj->ops->unprepare) 1345 obj->ops->unprepare(obj); 1346 return ret; 1347 } 1348 return 0; 1349 } 1350 EXPORT_SYMBOL_GPL(vb2_request_validate); 1351 1352 void vb2_request_queue(struct media_request *req) 1353 { 1354 struct media_request_object *obj, *obj_safe; 1355 1356 /* 1357 * Queue all objects. Note that buffer objects are at the end of the 1358 * objects list, after all other object types. Once buffer objects 1359 * are queued, the driver might delete them immediately (if the driver 1360 * processes the buffer at once), so we have to use 1361 * list_for_each_entry_safe() to handle the case where the object we 1362 * queue is deleted. 1363 */ 1364 list_for_each_entry_safe(obj, obj_safe, &req->objects, list) 1365 if (obj->ops->queue) 1366 obj->ops->queue(obj); 1367 } 1368 EXPORT_SYMBOL_GPL(vb2_request_queue); 1369 1370 MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); 1371 MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); 1372 MODULE_LICENSE("GPL"); 1373