Junghak Sung | c139990 | 2015-09-22 10:30:29 -0300 | [diff] [blame] | 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/err.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/poll.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/freezer.h> |
| 25 | #include <linux/kthread.h> |
| 26 | |
Junghak Sung | 3c5be98 | 2015-10-06 06:37:49 -0300 | [diff] [blame] | 27 | #include <media/v4l2-dev.h> |
| 28 | #include <media/v4l2-fh.h> |
| 29 | #include <media/v4l2-event.h> |
| 30 | #include <media/v4l2-common.h> |
| 31 | |
Junghak Sung | c139990 | 2015-09-22 10:30:29 -0300 | [diff] [blame] | 32 | #include <media/videobuf2-v4l2.h> |
| 33 | |
Junghak Sung | 3c5be98 | 2015-10-06 06:37:49 -0300 | [diff] [blame] | 34 | #include "videobuf2-internal.h" |
| 35 | |
| 36 | /* Flags that are set by the vb2 core */ |
| 37 | #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ |
| 38 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
| 39 | V4L2_BUF_FLAG_PREPARED | \ |
| 40 | V4L2_BUF_FLAG_TIMESTAMP_MASK) |
| 41 | /* Output buffer flags that should be passed on to the driver */ |
| 42 | #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \ |
| 43 | V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) |
| 44 | |
| 45 | /** |
| 46 | * __verify_planes_array() - verify that the planes array passed in struct |
| 47 | * v4l2_buffer from userspace can be safely used |
| 48 | */ |
| 49 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
| 50 | { |
| 51 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
| 52 | return 0; |
| 53 | |
| 54 | /* Is memory for copying plane information present? */ |
Julia Lawall | e88a3f8 | 2015-11-13 08:46:00 -0200 | [diff] [blame^] | 55 | if (b->m.planes == NULL) { |
Junghak Sung | 3c5be98 | 2015-10-06 06:37:49 -0300 | [diff] [blame] | 56 | dprintk(1, "multi-planar buffer passed but " |
| 57 | "planes array not provided\n"); |
| 58 | return -EINVAL; |
| 59 | } |
| 60 | |
| 61 | if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) { |
| 62 | dprintk(1, "incorrect planes array length, " |
| 63 | "expected %d, got %d\n", vb->num_planes, b->length); |
| 64 | return -EINVAL; |
| 65 | } |
| 66 | |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * __verify_length() - Verify that the bytesused value for each plane fits in |
| 72 | * the plane length and that the data offset doesn't exceed the bytesused value. |
| 73 | */ |
| 74 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
| 75 | { |
| 76 | unsigned int length; |
| 77 | unsigned int bytesused; |
| 78 | unsigned int plane; |
| 79 | |
| 80 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) |
| 81 | return 0; |
| 82 | |
| 83 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
| 84 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 85 | length = (b->memory == VB2_MEMORY_USERPTR || |
| 86 | b->memory == VB2_MEMORY_DMABUF) |
| 87 | ? b->m.planes[plane].length |
| 88 | : vb->planes[plane].length; |
| 89 | bytesused = b->m.planes[plane].bytesused |
| 90 | ? b->m.planes[plane].bytesused : length; |
| 91 | |
| 92 | if (b->m.planes[plane].bytesused > length) |
| 93 | return -EINVAL; |
| 94 | |
| 95 | if (b->m.planes[plane].data_offset > 0 && |
| 96 | b->m.planes[plane].data_offset >= bytesused) |
| 97 | return -EINVAL; |
| 98 | } |
| 99 | } else { |
| 100 | length = (b->memory == VB2_MEMORY_USERPTR) |
| 101 | ? b->length : vb->planes[0].length; |
| 102 | |
| 103 | if (b->bytesused > length) |
| 104 | return -EINVAL; |
| 105 | } |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static int __set_timestamp(struct vb2_buffer *vb, const void *pb) |
| 111 | { |
| 112 | const struct v4l2_buffer *b = pb; |
| 113 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
| 114 | struct vb2_queue *q = vb->vb2_queue; |
| 115 | |
| 116 | if (q->is_output) { |
| 117 | /* |
| 118 | * For output buffers copy the timestamp if needed, |
| 119 | * and the timecode field and flag if needed. |
| 120 | */ |
| 121 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 122 | V4L2_BUF_FLAG_TIMESTAMP_COPY) |
| 123 | vbuf->timestamp = b->timestamp; |
| 124 | vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; |
| 125 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) |
| 126 | vbuf->timecode = b->timecode; |
| 127 | } |
| 128 | return 0; |
| 129 | }; |
| 130 | |
| 131 | static void vb2_warn_zero_bytesused(struct vb2_buffer *vb) |
| 132 | { |
| 133 | static bool check_once; |
| 134 | |
| 135 | if (check_once) |
| 136 | return; |
| 137 | |
| 138 | check_once = true; |
| 139 | WARN_ON(1); |
| 140 | |
| 141 | pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n"); |
| 142 | if (vb->vb2_queue->allow_zero_bytesused) |
| 143 | pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); |
| 144 | else |
| 145 | pr_warn("use the actual size instead.\n"); |
| 146 | } |
| 147 | |
| 148 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
| 149 | const char *opname) |
| 150 | { |
| 151 | if (b->type != q->type) { |
| 152 | dprintk(1, "%s: invalid buffer type\n", opname); |
| 153 | return -EINVAL; |
| 154 | } |
| 155 | |
| 156 | if (b->index >= q->num_buffers) { |
| 157 | dprintk(1, "%s: buffer index out of range\n", opname); |
| 158 | return -EINVAL; |
| 159 | } |
| 160 | |
| 161 | if (q->bufs[b->index] == NULL) { |
| 162 | /* Should never happen */ |
| 163 | dprintk(1, "%s: buffer is NULL\n", opname); |
| 164 | return -EINVAL; |
| 165 | } |
| 166 | |
| 167 | if (b->memory != q->memory) { |
| 168 | dprintk(1, "%s: invalid memory type\n", opname); |
| 169 | return -EINVAL; |
| 170 | } |
| 171 | |
| 172 | return __verify_planes_array(q->bufs[b->index], b); |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be |
| 177 | * returned to userspace |
| 178 | */ |
| 179 | static int __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb) |
| 180 | { |
| 181 | struct v4l2_buffer *b = pb; |
| 182 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
| 183 | struct vb2_queue *q = vb->vb2_queue; |
| 184 | unsigned int plane; |
| 185 | |
| 186 | /* Copy back data such as timestamp, flags, etc. */ |
| 187 | b->index = vb->index; |
| 188 | b->type = vb->type; |
| 189 | b->memory = vb->memory; |
| 190 | b->bytesused = 0; |
| 191 | |
| 192 | b->flags = vbuf->flags; |
| 193 | b->field = vbuf->field; |
| 194 | b->timestamp = vbuf->timestamp; |
| 195 | b->timecode = vbuf->timecode; |
| 196 | b->sequence = vbuf->sequence; |
| 197 | b->reserved2 = 0; |
| 198 | b->reserved = 0; |
| 199 | |
| 200 | if (q->is_multiplanar) { |
| 201 | /* |
| 202 | * Fill in plane-related data if userspace provided an array |
| 203 | * for it. The caller has already verified memory and size. |
| 204 | */ |
| 205 | b->length = vb->num_planes; |
| 206 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 207 | struct v4l2_plane *pdst = &b->m.planes[plane]; |
| 208 | struct vb2_plane *psrc = &vb->planes[plane]; |
| 209 | |
| 210 | pdst->bytesused = psrc->bytesused; |
| 211 | pdst->length = psrc->length; |
| 212 | if (q->memory == VB2_MEMORY_MMAP) |
| 213 | pdst->m.mem_offset = psrc->m.offset; |
| 214 | else if (q->memory == VB2_MEMORY_USERPTR) |
| 215 | pdst->m.userptr = psrc->m.userptr; |
| 216 | else if (q->memory == VB2_MEMORY_DMABUF) |
| 217 | pdst->m.fd = psrc->m.fd; |
| 218 | pdst->data_offset = psrc->data_offset; |
| 219 | memset(pdst->reserved, 0, sizeof(pdst->reserved)); |
| 220 | } |
| 221 | } else { |
| 222 | /* |
| 223 | * We use length and offset in v4l2_planes array even for |
| 224 | * single-planar buffers, but userspace does not. |
| 225 | */ |
| 226 | b->length = vb->planes[0].length; |
| 227 | b->bytesused = vb->planes[0].bytesused; |
| 228 | if (q->memory == VB2_MEMORY_MMAP) |
| 229 | b->m.offset = vb->planes[0].m.offset; |
| 230 | else if (q->memory == VB2_MEMORY_USERPTR) |
| 231 | b->m.userptr = vb->planes[0].m.userptr; |
| 232 | else if (q->memory == VB2_MEMORY_DMABUF) |
| 233 | b->m.fd = vb->planes[0].m.fd; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Clear any buffer state related flags. |
| 238 | */ |
| 239 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
| 240 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
| 241 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
| 242 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { |
| 243 | /* |
| 244 | * For non-COPY timestamps, drop timestamp source bits |
| 245 | * and obtain the timestamp source from the queue. |
| 246 | */ |
| 247 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 248 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 249 | } |
| 250 | |
| 251 | switch (vb->state) { |
| 252 | case VB2_BUF_STATE_QUEUED: |
| 253 | case VB2_BUF_STATE_ACTIVE: |
| 254 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
| 255 | break; |
| 256 | case VB2_BUF_STATE_ERROR: |
| 257 | b->flags |= V4L2_BUF_FLAG_ERROR; |
| 258 | /* fall through */ |
| 259 | case VB2_BUF_STATE_DONE: |
| 260 | b->flags |= V4L2_BUF_FLAG_DONE; |
| 261 | break; |
| 262 | case VB2_BUF_STATE_PREPARED: |
| 263 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
| 264 | break; |
| 265 | case VB2_BUF_STATE_PREPARING: |
| 266 | case VB2_BUF_STATE_DEQUEUED: |
| 267 | case VB2_BUF_STATE_REQUEUEING: |
| 268 | /* nothing */ |
| 269 | break; |
| 270 | } |
| 271 | |
| 272 | if (vb2_buffer_in_use(q, vb)) |
| 273 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /** |
| 279 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
| 280 | * v4l2_buffer by the userspace. It also verifies that struct |
| 281 | * v4l2_buffer has a valid number of planes. |
| 282 | */ |
| 283 | static int __fill_vb2_buffer(struct vb2_buffer *vb, |
| 284 | const void *pb, struct vb2_plane *planes) |
| 285 | { |
| 286 | struct vb2_queue *q = vb->vb2_queue; |
| 287 | const struct v4l2_buffer *b = pb; |
| 288 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
| 289 | unsigned int plane; |
| 290 | int ret; |
| 291 | |
| 292 | ret = __verify_length(vb, b); |
| 293 | if (ret < 0) { |
| 294 | dprintk(1, "plane parameters verification failed: %d\n", ret); |
| 295 | return ret; |
| 296 | } |
| 297 | if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) { |
| 298 | /* |
| 299 | * If the format's field is ALTERNATE, then the buffer's field |
| 300 | * should be either TOP or BOTTOM, not ALTERNATE since that |
| 301 | * makes no sense. The driver has to know whether the |
| 302 | * buffer represents a top or a bottom field in order to |
| 303 | * program any DMA correctly. Using ALTERNATE is wrong, since |
| 304 | * that just says that it is either a top or a bottom field, |
| 305 | * but not which of the two it is. |
| 306 | */ |
| 307 | dprintk(1, "the field is incorrectly set to ALTERNATE " |
| 308 | "for an output buffer\n"); |
| 309 | return -EINVAL; |
| 310 | } |
| 311 | vbuf->timestamp.tv_sec = 0; |
| 312 | vbuf->timestamp.tv_usec = 0; |
| 313 | vbuf->sequence = 0; |
| 314 | |
| 315 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
| 316 | if (b->memory == VB2_MEMORY_USERPTR) { |
| 317 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 318 | planes[plane].m.userptr = |
| 319 | b->m.planes[plane].m.userptr; |
| 320 | planes[plane].length = |
| 321 | b->m.planes[plane].length; |
| 322 | } |
| 323 | } |
| 324 | if (b->memory == VB2_MEMORY_DMABUF) { |
| 325 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 326 | planes[plane].m.fd = |
| 327 | b->m.planes[plane].m.fd; |
| 328 | planes[plane].length = |
| 329 | b->m.planes[plane].length; |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | /* Fill in driver-provided information for OUTPUT types */ |
| 334 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 335 | /* |
| 336 | * Will have to go up to b->length when API starts |
| 337 | * accepting variable number of planes. |
| 338 | * |
| 339 | * If bytesused == 0 for the output buffer, then fall |
| 340 | * back to the full buffer size. In that case |
| 341 | * userspace clearly never bothered to set it and |
| 342 | * it's a safe assumption that they really meant to |
| 343 | * use the full plane sizes. |
| 344 | * |
| 345 | * Some drivers, e.g. old codec drivers, use bytesused == 0 |
| 346 | * as a way to indicate that streaming is finished. |
| 347 | * In that case, the driver should use the |
| 348 | * allow_zero_bytesused flag to keep old userspace |
| 349 | * applications working. |
| 350 | */ |
| 351 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 352 | struct vb2_plane *pdst = &planes[plane]; |
| 353 | struct v4l2_plane *psrc = &b->m.planes[plane]; |
| 354 | |
| 355 | if (psrc->bytesused == 0) |
| 356 | vb2_warn_zero_bytesused(vb); |
| 357 | |
| 358 | if (vb->vb2_queue->allow_zero_bytesused) |
| 359 | pdst->bytesused = psrc->bytesused; |
| 360 | else |
| 361 | pdst->bytesused = psrc->bytesused ? |
| 362 | psrc->bytesused : pdst->length; |
| 363 | pdst->data_offset = psrc->data_offset; |
| 364 | } |
| 365 | } |
| 366 | } else { |
| 367 | /* |
| 368 | * Single-planar buffers do not use planes array, |
| 369 | * so fill in relevant v4l2_buffer struct fields instead. |
| 370 | * In videobuf we use our internal V4l2_planes struct for |
| 371 | * single-planar buffers as well, for simplicity. |
| 372 | * |
| 373 | * If bytesused == 0 for the output buffer, then fall back |
| 374 | * to the full buffer size as that's a sensible default. |
| 375 | * |
| 376 | * Some drivers, e.g. old codec drivers, use bytesused == 0 as |
| 377 | * a way to indicate that streaming is finished. In that case, |
| 378 | * the driver should use the allow_zero_bytesused flag to keep |
| 379 | * old userspace applications working. |
| 380 | */ |
| 381 | if (b->memory == VB2_MEMORY_USERPTR) { |
| 382 | planes[0].m.userptr = b->m.userptr; |
| 383 | planes[0].length = b->length; |
| 384 | } |
| 385 | |
| 386 | if (b->memory == VB2_MEMORY_DMABUF) { |
| 387 | planes[0].m.fd = b->m.fd; |
| 388 | planes[0].length = b->length; |
| 389 | } |
| 390 | |
| 391 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 392 | if (b->bytesused == 0) |
| 393 | vb2_warn_zero_bytesused(vb); |
| 394 | |
| 395 | if (vb->vb2_queue->allow_zero_bytesused) |
| 396 | planes[0].bytesused = b->bytesused; |
| 397 | else |
| 398 | planes[0].bytesused = b->bytesused ? |
| 399 | b->bytesused : planes[0].length; |
| 400 | } else |
| 401 | planes[0].bytesused = 0; |
| 402 | |
| 403 | } |
| 404 | |
| 405 | /* Zero flags that the vb2 core handles */ |
| 406 | vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
| 407 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
| 408 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 409 | /* |
| 410 | * Non-COPY timestamps and non-OUTPUT queues will get |
| 411 | * their timestamp and timestamp source flags from the |
| 412 | * queue. |
| 413 | */ |
| 414 | vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 415 | } |
| 416 | |
| 417 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 418 | /* |
| 419 | * For output buffers mask out the timecode flag: |
| 420 | * this will be handled later in vb2_internal_qbuf(). |
| 421 | * The 'field' is valid metadata for this output buffer |
| 422 | * and so that needs to be copied here. |
| 423 | */ |
| 424 | vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE; |
| 425 | vbuf->field = b->field; |
| 426 | } else { |
| 427 | /* Zero any output buffer flags as this is a capture buffer */ |
| 428 | vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS; |
| 429 | } |
| 430 | |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static const struct vb2_buf_ops v4l2_buf_ops = { |
| 435 | .fill_user_buffer = __fill_v4l2_buffer, |
| 436 | .fill_vb2_buffer = __fill_vb2_buffer, |
| 437 | .set_timestamp = __set_timestamp, |
| 438 | }; |
| 439 | |
| 440 | /** |
| 441 | * vb2_querybuf() - query video buffer information |
| 442 | * @q: videobuf queue |
| 443 | * @b: buffer struct passed from userspace to vidioc_querybuf handler |
| 444 | * in driver |
| 445 | * |
| 446 | * Should be called from vidioc_querybuf ioctl handler in driver. |
| 447 | * This function will verify the passed v4l2_buffer structure and fill the |
| 448 | * relevant information for the userspace. |
| 449 | * |
| 450 | * The return values from this function are intended to be directly returned |
| 451 | * from vidioc_querybuf handler in driver. |
| 452 | */ |
| 453 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 454 | { |
| 455 | struct vb2_buffer *vb; |
| 456 | int ret; |
| 457 | |
| 458 | if (b->type != q->type) { |
| 459 | dprintk(1, "wrong buffer type\n"); |
| 460 | return -EINVAL; |
| 461 | } |
| 462 | |
| 463 | if (b->index >= q->num_buffers) { |
| 464 | dprintk(1, "buffer index out of range\n"); |
| 465 | return -EINVAL; |
| 466 | } |
| 467 | vb = q->bufs[b->index]; |
| 468 | ret = __verify_planes_array(vb, b); |
| 469 | |
| 470 | return ret ? ret : vb2_core_querybuf(q, b->index, b); |
| 471 | } |
| 472 | EXPORT_SYMBOL(vb2_querybuf); |
| 473 | |
| 474 | /** |
| 475 | * vb2_reqbufs() - Wrapper for vb2_core_reqbufs() that also verifies |
| 476 | * the memory and type values. |
| 477 | * @q: videobuf2 queue |
| 478 | * @req: struct passed from userspace to vidioc_reqbufs handler |
| 479 | * in driver |
| 480 | */ |
| 481 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
| 482 | { |
| 483 | int ret = vb2_verify_memory_type(q, req->memory, req->type); |
| 484 | |
| 485 | return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count); |
| 486 | } |
| 487 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
| 488 | |
| 489 | /** |
| 490 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
| 491 | * @q: videobuf2 queue |
| 492 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
| 493 | * handler in driver |
| 494 | * |
| 495 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
| 496 | * This function: |
| 497 | * 1) verifies the passed buffer, |
| 498 | * 2) calls buf_prepare callback in the driver (if provided), in which |
| 499 | * driver-specific buffer initialization can be performed, |
| 500 | * |
| 501 | * The return values from this function are intended to be directly returned |
| 502 | * from vidioc_prepare_buf handler in driver. |
| 503 | */ |
| 504 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 505 | { |
| 506 | int ret; |
| 507 | |
| 508 | if (vb2_fileio_is_active(q)) { |
| 509 | dprintk(1, "file io in progress\n"); |
| 510 | return -EBUSY; |
| 511 | } |
| 512 | |
| 513 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
| 514 | |
| 515 | return ret ? ret : vb2_core_prepare_buf(q, b->index, b); |
| 516 | } |
| 517 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); |
| 518 | |
| 519 | /** |
| 520 | * vb2_create_bufs() - Wrapper for vb2_core_create_bufs() that also verifies |
| 521 | * the memory and type values. |
| 522 | * @q: videobuf2 queue |
| 523 | * @create: creation parameters, passed from userspace to vidioc_create_bufs |
| 524 | * handler in driver |
| 525 | */ |
| 526 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
| 527 | { |
| 528 | int ret = vb2_verify_memory_type(q, create->memory, |
| 529 | create->format.type); |
| 530 | |
| 531 | create->index = q->num_buffers; |
| 532 | if (create->count == 0) |
| 533 | return ret != -EBUSY ? ret : 0; |
| 534 | return ret ? ret : vb2_core_create_bufs(q, create->memory, |
| 535 | &create->count, &create->format); |
| 536 | } |
| 537 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
| 538 | |
| 539 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 540 | { |
| 541 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
| 542 | |
| 543 | return ret ? ret : vb2_core_qbuf(q, b->index, b); |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | * vb2_qbuf() - Queue a buffer from userspace |
| 548 | * @q: videobuf2 queue |
| 549 | * @b: buffer structure passed from userspace to vidioc_qbuf handler |
| 550 | * in driver |
| 551 | * |
| 552 | * Should be called from vidioc_qbuf ioctl handler of a driver. |
| 553 | * This function: |
| 554 | * 1) verifies the passed buffer, |
| 555 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in |
| 556 | * which driver-specific buffer initialization can be performed, |
| 557 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue |
| 558 | * callback for processing. |
| 559 | * |
| 560 | * The return values from this function are intended to be directly returned |
| 561 | * from vidioc_qbuf handler in driver. |
| 562 | */ |
| 563 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 564 | { |
| 565 | if (vb2_fileio_is_active(q)) { |
| 566 | dprintk(1, "file io in progress\n"); |
| 567 | return -EBUSY; |
| 568 | } |
| 569 | |
| 570 | return vb2_internal_qbuf(q, b); |
| 571 | } |
| 572 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
| 573 | |
| 574 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, |
| 575 | bool nonblocking) |
| 576 | { |
| 577 | int ret; |
| 578 | |
| 579 | if (b->type != q->type) { |
| 580 | dprintk(1, "invalid buffer type\n"); |
| 581 | return -EINVAL; |
| 582 | } |
| 583 | |
| 584 | ret = vb2_core_dqbuf(q, b, nonblocking); |
| 585 | |
| 586 | if (!ret && !q->is_output && |
| 587 | b->flags & V4L2_BUF_FLAG_LAST) |
| 588 | q->last_buffer_dequeued = true; |
| 589 | |
| 590 | return ret; |
| 591 | } |
| 592 | |
| 593 | /** |
| 594 | * vb2_dqbuf() - Dequeue a buffer to the userspace |
| 595 | * @q: videobuf2 queue |
| 596 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler |
| 597 | * in driver |
| 598 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no |
| 599 | * buffers ready for dequeuing are present. Normally the driver |
| 600 | * would be passing (file->f_flags & O_NONBLOCK) here |
| 601 | * |
| 602 | * Should be called from vidioc_dqbuf ioctl handler of a driver. |
| 603 | * This function: |
| 604 | * 1) verifies the passed buffer, |
| 605 | * 2) calls buf_finish callback in the driver (if provided), in which |
| 606 | * driver can perform any additional operations that may be required before |
| 607 | * returning the buffer to userspace, such as cache sync, |
| 608 | * 3) the buffer struct members are filled with relevant information for |
| 609 | * the userspace. |
| 610 | * |
| 611 | * The return values from this function are intended to be directly returned |
| 612 | * from vidioc_dqbuf handler in driver. |
| 613 | */ |
| 614 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
| 615 | { |
| 616 | if (vb2_fileio_is_active(q)) { |
| 617 | dprintk(1, "file io in progress\n"); |
| 618 | return -EBUSY; |
| 619 | } |
| 620 | return vb2_internal_dqbuf(q, b, nonblocking); |
| 621 | } |
| 622 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
| 623 | |
| 624 | /** |
| 625 | * vb2_streamon - start streaming |
| 626 | * @q: videobuf2 queue |
| 627 | * @type: type argument passed from userspace to vidioc_streamon handler |
| 628 | * |
| 629 | * Should be called from vidioc_streamon handler of a driver. |
| 630 | * This function: |
| 631 | * 1) verifies current state |
| 632 | * 2) passes any previously queued buffers to the driver and starts streaming |
| 633 | * |
| 634 | * The return values from this function are intended to be directly returned |
| 635 | * from vidioc_streamon handler in the driver. |
| 636 | */ |
| 637 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
| 638 | { |
| 639 | if (vb2_fileio_is_active(q)) { |
| 640 | dprintk(1, "file io in progress\n"); |
| 641 | return -EBUSY; |
| 642 | } |
| 643 | return vb2_core_streamon(q, type); |
| 644 | } |
| 645 | EXPORT_SYMBOL_GPL(vb2_streamon); |
| 646 | |
| 647 | /** |
| 648 | * vb2_streamoff - stop streaming |
| 649 | * @q: videobuf2 queue |
| 650 | * @type: type argument passed from userspace to vidioc_streamoff handler |
| 651 | * |
| 652 | * Should be called from vidioc_streamoff handler of a driver. |
| 653 | * This function: |
| 654 | * 1) verifies current state, |
| 655 | * 2) stop streaming and dequeues any queued buffers, including those previously |
| 656 | * passed to the driver (after waiting for the driver to finish). |
| 657 | * |
| 658 | * This call can be used for pausing playback. |
| 659 | * The return values from this function are intended to be directly returned |
| 660 | * from vidioc_streamoff handler in the driver |
| 661 | */ |
| 662 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
| 663 | { |
| 664 | if (vb2_fileio_is_active(q)) { |
| 665 | dprintk(1, "file io in progress\n"); |
| 666 | return -EBUSY; |
| 667 | } |
| 668 | return vb2_core_streamoff(q, type); |
| 669 | } |
| 670 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
| 671 | |
| 672 | /** |
| 673 | * vb2_expbuf() - Export a buffer as a file descriptor |
| 674 | * @q: videobuf2 queue |
| 675 | * @eb: export buffer structure passed from userspace to vidioc_expbuf |
| 676 | * handler in driver |
| 677 | * |
| 678 | * The return values from this function are intended to be directly returned |
| 679 | * from vidioc_expbuf handler in driver. |
| 680 | */ |
| 681 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) |
| 682 | { |
| 683 | return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index, |
| 684 | eb->plane, eb->flags); |
| 685 | } |
| 686 | EXPORT_SYMBOL_GPL(vb2_expbuf); |
| 687 | |
| 688 | /** |
| 689 | * vb2_queue_init() - initialize a videobuf2 queue |
| 690 | * @q: videobuf2 queue; this structure should be allocated in driver |
| 691 | * |
| 692 | * The vb2_queue structure should be allocated by the driver. The driver is |
| 693 | * responsible of clearing it's content and setting initial values for some |
| 694 | * required entries before calling this function. |
| 695 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer |
| 696 | * to the struct vb2_queue description in include/media/videobuf2-core.h |
| 697 | * for more information. |
| 698 | */ |
| 699 | int vb2_queue_init(struct vb2_queue *q) |
| 700 | { |
| 701 | /* |
| 702 | * Sanity check |
| 703 | */ |
| 704 | if (WARN_ON(!q) || |
| 705 | WARN_ON(q->timestamp_flags & |
| 706 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | |
| 707 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) |
| 708 | return -EINVAL; |
| 709 | |
| 710 | /* Warn that the driver should choose an appropriate timestamp type */ |
| 711 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 712 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); |
| 713 | |
| 714 | /* Warn that vb2_memory should match with v4l2_memory */ |
| 715 | if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP) |
| 716 | || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR) |
| 717 | || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF)) |
| 718 | return -EINVAL; |
| 719 | |
| 720 | if (q->buf_struct_size == 0) |
| 721 | q->buf_struct_size = sizeof(struct vb2_v4l2_buffer); |
| 722 | |
| 723 | q->buf_ops = &v4l2_buf_ops; |
| 724 | q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
| 725 | q->is_output = V4L2_TYPE_IS_OUTPUT(q->type); |
| 726 | |
| 727 | return vb2_core_queue_init(q); |
| 728 | } |
| 729 | EXPORT_SYMBOL_GPL(vb2_queue_init); |
| 730 | |
| 731 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
| 732 | static int __vb2_cleanup_fileio(struct vb2_queue *q); |
| 733 | |
| 734 | /** |
| 735 | * vb2_queue_release() - stop streaming, release the queue and free memory |
| 736 | * @q: videobuf2 queue |
| 737 | * |
| 738 | * This function stops streaming and performs necessary clean ups, including |
| 739 | * freeing video buffer memory. The driver is responsible for freeing |
| 740 | * the vb2_queue structure itself. |
| 741 | */ |
| 742 | void vb2_queue_release(struct vb2_queue *q) |
| 743 | { |
| 744 | __vb2_cleanup_fileio(q); |
| 745 | vb2_core_queue_release(q); |
| 746 | } |
| 747 | EXPORT_SYMBOL_GPL(vb2_queue_release); |
| 748 | |
| 749 | /** |
| 750 | * vb2_poll() - implements poll userspace operation |
| 751 | * @q: videobuf2 queue |
| 752 | * @file: file argument passed to the poll file operation handler |
| 753 | * @wait: wait argument passed to the poll file operation handler |
| 754 | * |
| 755 | * This function implements poll file operation handler for a driver. |
| 756 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will |
| 757 | * be informed that the file descriptor of a video device is available for |
| 758 | * reading. |
| 759 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor |
| 760 | * will be reported as available for writing. |
| 761 | * |
| 762 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
| 763 | * pending events. |
| 764 | * |
| 765 | * The return values from this function are intended to be directly returned |
| 766 | * from poll handler in driver. |
| 767 | */ |
| 768 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) |
| 769 | { |
| 770 | struct video_device *vfd = video_devdata(file); |
| 771 | unsigned long req_events = poll_requested_events(wait); |
| 772 | struct vb2_buffer *vb = NULL; |
| 773 | unsigned int res = 0; |
| 774 | unsigned long flags; |
| 775 | |
| 776 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { |
| 777 | struct v4l2_fh *fh = file->private_data; |
| 778 | |
| 779 | if (v4l2_event_pending(fh)) |
| 780 | res = POLLPRI; |
| 781 | else if (req_events & POLLPRI) |
| 782 | poll_wait(file, &fh->wait, wait); |
| 783 | } |
| 784 | |
| 785 | if (!q->is_output && !(req_events & (POLLIN | POLLRDNORM))) |
| 786 | return res; |
| 787 | if (q->is_output && !(req_events & (POLLOUT | POLLWRNORM))) |
| 788 | return res; |
| 789 | |
| 790 | /* |
| 791 | * Start file I/O emulator only if streaming API has not been used yet. |
| 792 | */ |
| 793 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
| 794 | if (!q->is_output && (q->io_modes & VB2_READ) && |
| 795 | (req_events & (POLLIN | POLLRDNORM))) { |
| 796 | if (__vb2_init_fileio(q, 1)) |
| 797 | return res | POLLERR; |
| 798 | } |
| 799 | if (q->is_output && (q->io_modes & VB2_WRITE) && |
| 800 | (req_events & (POLLOUT | POLLWRNORM))) { |
| 801 | if (__vb2_init_fileio(q, 0)) |
| 802 | return res | POLLERR; |
| 803 | /* |
| 804 | * Write to OUTPUT queue can be done immediately. |
| 805 | */ |
| 806 | return res | POLLOUT | POLLWRNORM; |
| 807 | } |
| 808 | } |
| 809 | |
| 810 | /* |
| 811 | * There is nothing to wait for if the queue isn't streaming, or if the |
| 812 | * error flag is set. |
| 813 | */ |
| 814 | if (!vb2_is_streaming(q) || q->error) |
| 815 | return res | POLLERR; |
| 816 | /* |
| 817 | * For compatibility with vb1: if QBUF hasn't been called yet, then |
| 818 | * return POLLERR as well. This only affects capture queues, output |
| 819 | * queues will always initialize waiting_for_buffers to false. |
| 820 | */ |
| 821 | if (q->waiting_for_buffers) |
| 822 | return res | POLLERR; |
| 823 | |
| 824 | /* |
Hans Verkuil | 4623e59 | 2015-10-29 03:02:06 -0200 | [diff] [blame] | 825 | * For output streams you can call write() as long as there are fewer |
| 826 | * buffers queued than there are buffers available. |
Junghak Sung | 3c5be98 | 2015-10-06 06:37:49 -0300 | [diff] [blame] | 827 | */ |
Hans Verkuil | 4623e59 | 2015-10-29 03:02:06 -0200 | [diff] [blame] | 828 | if (q->is_output && q->fileio && q->queued_count < q->num_buffers) |
Junghak Sung | 3c5be98 | 2015-10-06 06:37:49 -0300 | [diff] [blame] | 829 | return res | POLLOUT | POLLWRNORM; |
| 830 | |
| 831 | if (list_empty(&q->done_list)) { |
| 832 | /* |
| 833 | * If the last buffer was dequeued from a capture queue, |
| 834 | * return immediately. DQBUF will return -EPIPE. |
| 835 | */ |
| 836 | if (q->last_buffer_dequeued) |
| 837 | return res | POLLIN | POLLRDNORM; |
| 838 | |
| 839 | poll_wait(file, &q->done_wq, wait); |
| 840 | } |
| 841 | |
| 842 | /* |
| 843 | * Take first buffer available for dequeuing. |
| 844 | */ |
| 845 | spin_lock_irqsave(&q->done_lock, flags); |
| 846 | if (!list_empty(&q->done_list)) |
| 847 | vb = list_first_entry(&q->done_list, struct vb2_buffer, |
| 848 | done_entry); |
| 849 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 850 | |
| 851 | if (vb && (vb->state == VB2_BUF_STATE_DONE |
| 852 | || vb->state == VB2_BUF_STATE_ERROR)) { |
| 853 | return (q->is_output) ? |
| 854 | res | POLLOUT | POLLWRNORM : |
| 855 | res | POLLIN | POLLRDNORM; |
| 856 | } |
| 857 | return res; |
| 858 | } |
| 859 | EXPORT_SYMBOL_GPL(vb2_poll); |
| 860 | |
| 861 | /** |
| 862 | * struct vb2_fileio_buf - buffer context used by file io emulator |
| 863 | * |
| 864 | * vb2 provides a compatibility layer and emulator of file io (read and |
| 865 | * write) calls on top of streaming API. This structure is used for |
| 866 | * tracking context related to the buffers. |
| 867 | */ |
| 868 | struct vb2_fileio_buf { |
| 869 | void *vaddr; |
| 870 | unsigned int size; |
| 871 | unsigned int pos; |
| 872 | unsigned int queued:1; |
| 873 | }; |
| 874 | |
| 875 | /** |
| 876 | * struct vb2_fileio_data - queue context used by file io emulator |
| 877 | * |
| 878 | * @cur_index: the index of the buffer currently being read from or |
| 879 | * written to. If equal to q->num_buffers then a new buffer |
| 880 | * must be dequeued. |
| 881 | * @initial_index: in the read() case all buffers are queued up immediately |
| 882 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles |
| 883 | * buffers. However, in the write() case no buffers are initially |
| 884 | * queued, instead whenever a buffer is full it is queued up by |
| 885 | * __vb2_perform_fileio(). Only once all available buffers have |
| 886 | * been queued up will __vb2_perform_fileio() start to dequeue |
| 887 | * buffers. This means that initially __vb2_perform_fileio() |
| 888 | * needs to know what buffer index to use when it is queuing up |
| 889 | * the buffers for the first time. That initial index is stored |
| 890 | * in this field. Once it is equal to q->num_buffers all |
| 891 | * available buffers have been queued and __vb2_perform_fileio() |
| 892 | * should start the normal dequeue/queue cycle. |
| 893 | * |
| 894 | * vb2 provides a compatibility layer and emulator of file io (read and |
| 895 | * write) calls on top of streaming API. For proper operation it required |
| 896 | * this structure to save the driver state between each call of the read |
| 897 | * or write function. |
| 898 | */ |
| 899 | struct vb2_fileio_data { |
| 900 | struct v4l2_requestbuffers req; |
| 901 | struct v4l2_plane p; |
| 902 | struct v4l2_buffer b; |
| 903 | struct vb2_fileio_buf bufs[VB2_MAX_FRAME]; |
| 904 | unsigned int cur_index; |
| 905 | unsigned int initial_index; |
| 906 | unsigned int q_count; |
| 907 | unsigned int dq_count; |
| 908 | unsigned read_once:1; |
| 909 | unsigned write_immediately:1; |
| 910 | }; |
| 911 | |
| 912 | /** |
| 913 | * __vb2_init_fileio() - initialize file io emulator |
| 914 | * @q: videobuf2 queue |
| 915 | * @read: mode selector (1 means read, 0 means write) |
| 916 | */ |
| 917 | static int __vb2_init_fileio(struct vb2_queue *q, int read) |
| 918 | { |
| 919 | struct vb2_fileio_data *fileio; |
| 920 | int i, ret; |
| 921 | unsigned int count = 0; |
| 922 | |
| 923 | /* |
| 924 | * Sanity check |
| 925 | */ |
| 926 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
| 927 | (!read && !(q->io_modes & VB2_WRITE)))) |
| 928 | return -EINVAL; |
| 929 | |
| 930 | /* |
| 931 | * Check if device supports mapping buffers to kernel virtual space. |
| 932 | */ |
| 933 | if (!q->mem_ops->vaddr) |
| 934 | return -EBUSY; |
| 935 | |
| 936 | /* |
| 937 | * Check if streaming api has not been already activated. |
| 938 | */ |
| 939 | if (q->streaming || q->num_buffers > 0) |
| 940 | return -EBUSY; |
| 941 | |
| 942 | /* |
| 943 | * Start with count 1, driver can increase it in queue_setup() |
| 944 | */ |
| 945 | count = 1; |
| 946 | |
| 947 | dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n", |
| 948 | (read) ? "read" : "write", count, q->fileio_read_once, |
| 949 | q->fileio_write_immediately); |
| 950 | |
| 951 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); |
| 952 | if (fileio == NULL) |
| 953 | return -ENOMEM; |
| 954 | |
| 955 | fileio->read_once = q->fileio_read_once; |
| 956 | fileio->write_immediately = q->fileio_write_immediately; |
| 957 | |
| 958 | /* |
| 959 | * Request buffers and use MMAP type to force driver |
| 960 | * to allocate buffers by itself. |
| 961 | */ |
| 962 | fileio->req.count = count; |
| 963 | fileio->req.memory = VB2_MEMORY_MMAP; |
| 964 | fileio->req.type = q->type; |
| 965 | q->fileio = fileio; |
| 966 | ret = vb2_core_reqbufs(q, fileio->req.memory, &fileio->req.count); |
| 967 | if (ret) |
| 968 | goto err_kfree; |
| 969 | |
| 970 | /* |
| 971 | * Check if plane_count is correct |
| 972 | * (multiplane buffers are not supported). |
| 973 | */ |
| 974 | if (q->bufs[0]->num_planes != 1) { |
| 975 | ret = -EBUSY; |
| 976 | goto err_reqbufs; |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * Get kernel address of each buffer. |
| 981 | */ |
| 982 | for (i = 0; i < q->num_buffers; i++) { |
| 983 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); |
| 984 | if (fileio->bufs[i].vaddr == NULL) { |
| 985 | ret = -EINVAL; |
| 986 | goto err_reqbufs; |
| 987 | } |
| 988 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
| 989 | } |
| 990 | |
| 991 | /* |
| 992 | * Read mode requires pre queuing of all buffers. |
| 993 | */ |
| 994 | if (read) { |
| 995 | bool is_multiplanar = q->is_multiplanar; |
| 996 | |
| 997 | /* |
| 998 | * Queue all buffers. |
| 999 | */ |
| 1000 | for (i = 0; i < q->num_buffers; i++) { |
| 1001 | struct v4l2_buffer *b = &fileio->b; |
| 1002 | |
| 1003 | memset(b, 0, sizeof(*b)); |
| 1004 | b->type = q->type; |
| 1005 | if (is_multiplanar) { |
| 1006 | memset(&fileio->p, 0, sizeof(fileio->p)); |
| 1007 | b->m.planes = &fileio->p; |
| 1008 | b->length = 1; |
| 1009 | } |
| 1010 | b->memory = q->memory; |
| 1011 | b->index = i; |
| 1012 | ret = vb2_internal_qbuf(q, b); |
| 1013 | if (ret) |
| 1014 | goto err_reqbufs; |
| 1015 | fileio->bufs[i].queued = 1; |
| 1016 | } |
| 1017 | /* |
| 1018 | * All buffers have been queued, so mark that by setting |
| 1019 | * initial_index to q->num_buffers |
| 1020 | */ |
| 1021 | fileio->initial_index = q->num_buffers; |
| 1022 | fileio->cur_index = q->num_buffers; |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * Start streaming. |
| 1027 | */ |
| 1028 | ret = vb2_core_streamon(q, q->type); |
| 1029 | if (ret) |
| 1030 | goto err_reqbufs; |
| 1031 | |
| 1032 | return ret; |
| 1033 | |
| 1034 | err_reqbufs: |
| 1035 | fileio->req.count = 0; |
| 1036 | vb2_core_reqbufs(q, fileio->req.memory, &fileio->req.count); |
| 1037 | |
| 1038 | err_kfree: |
| 1039 | q->fileio = NULL; |
| 1040 | kfree(fileio); |
| 1041 | return ret; |
| 1042 | } |
| 1043 | |
| 1044 | /** |
| 1045 | * __vb2_cleanup_fileio() - free resourced used by file io emulator |
| 1046 | * @q: videobuf2 queue |
| 1047 | */ |
| 1048 | static int __vb2_cleanup_fileio(struct vb2_queue *q) |
| 1049 | { |
| 1050 | struct vb2_fileio_data *fileio = q->fileio; |
| 1051 | |
| 1052 | if (fileio) { |
| 1053 | vb2_core_streamoff(q, q->type); |
| 1054 | q->fileio = NULL; |
| 1055 | fileio->req.count = 0; |
| 1056 | vb2_reqbufs(q, &fileio->req); |
| 1057 | kfree(fileio); |
| 1058 | dprintk(3, "file io emulator closed\n"); |
| 1059 | } |
| 1060 | return 0; |
| 1061 | } |
| 1062 | |
| 1063 | /** |
| 1064 | * __vb2_perform_fileio() - perform a single file io (read or write) operation |
| 1065 | * @q: videobuf2 queue |
| 1066 | * @data: pointed to target userspace buffer |
| 1067 | * @count: number of bytes to read or write |
| 1068 | * @ppos: file handle position tracking pointer |
| 1069 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) |
| 1070 | * @read: access mode selector (1 means read, 0 means write) |
| 1071 | */ |
| 1072 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, |
| 1073 | loff_t *ppos, int nonblock, int read) |
| 1074 | { |
| 1075 | struct vb2_fileio_data *fileio; |
| 1076 | struct vb2_fileio_buf *buf; |
| 1077 | bool is_multiplanar = q->is_multiplanar; |
| 1078 | /* |
| 1079 | * When using write() to write data to an output video node the vb2 core |
| 1080 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody |
| 1081 | * else is able to provide this information with the write() operation. |
| 1082 | */ |
| 1083 | bool set_timestamp = !read && |
| 1084 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 1085 | V4L2_BUF_FLAG_TIMESTAMP_COPY; |
| 1086 | int ret, index; |
| 1087 | |
| 1088 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", |
| 1089 | read ? "read" : "write", (long)*ppos, count, |
| 1090 | nonblock ? "non" : ""); |
| 1091 | |
| 1092 | if (!data) |
| 1093 | return -EINVAL; |
| 1094 | |
| 1095 | /* |
| 1096 | * Initialize emulator on first call. |
| 1097 | */ |
| 1098 | if (!vb2_fileio_is_active(q)) { |
| 1099 | ret = __vb2_init_fileio(q, read); |
| 1100 | dprintk(3, "vb2_init_fileio result: %d\n", ret); |
| 1101 | if (ret) |
| 1102 | return ret; |
| 1103 | } |
| 1104 | fileio = q->fileio; |
| 1105 | |
| 1106 | /* |
| 1107 | * Check if we need to dequeue the buffer. |
| 1108 | */ |
| 1109 | index = fileio->cur_index; |
| 1110 | if (index >= q->num_buffers) { |
| 1111 | /* |
| 1112 | * Call vb2_dqbuf to get buffer back. |
| 1113 | */ |
| 1114 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 1115 | fileio->b.type = q->type; |
| 1116 | fileio->b.memory = q->memory; |
| 1117 | if (is_multiplanar) { |
| 1118 | memset(&fileio->p, 0, sizeof(fileio->p)); |
| 1119 | fileio->b.m.planes = &fileio->p; |
| 1120 | fileio->b.length = 1; |
| 1121 | } |
| 1122 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
| 1123 | dprintk(5, "vb2_dqbuf result: %d\n", ret); |
| 1124 | if (ret) |
| 1125 | return ret; |
| 1126 | fileio->dq_count += 1; |
| 1127 | |
| 1128 | fileio->cur_index = index = fileio->b.index; |
| 1129 | buf = &fileio->bufs[index]; |
| 1130 | |
| 1131 | /* |
| 1132 | * Get number of bytes filled by the driver |
| 1133 | */ |
| 1134 | buf->pos = 0; |
| 1135 | buf->queued = 0; |
| 1136 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
| 1137 | : vb2_plane_size(q->bufs[index], 0); |
| 1138 | /* Compensate for data_offset on read in the multiplanar case. */ |
| 1139 | if (is_multiplanar && read && |
| 1140 | fileio->b.m.planes[0].data_offset < buf->size) { |
| 1141 | buf->pos = fileio->b.m.planes[0].data_offset; |
| 1142 | buf->size -= buf->pos; |
| 1143 | } |
| 1144 | } else { |
| 1145 | buf = &fileio->bufs[index]; |
| 1146 | } |
| 1147 | |
| 1148 | /* |
| 1149 | * Limit count on last few bytes of the buffer. |
| 1150 | */ |
| 1151 | if (buf->pos + count > buf->size) { |
| 1152 | count = buf->size - buf->pos; |
| 1153 | dprintk(5, "reducing read count: %zd\n", count); |
| 1154 | } |
| 1155 | |
| 1156 | /* |
| 1157 | * Transfer data to userspace. |
| 1158 | */ |
| 1159 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", |
| 1160 | count, index, buf->pos); |
| 1161 | if (read) |
| 1162 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); |
| 1163 | else |
| 1164 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); |
| 1165 | if (ret) { |
| 1166 | dprintk(3, "error copying data\n"); |
| 1167 | return -EFAULT; |
| 1168 | } |
| 1169 | |
| 1170 | /* |
| 1171 | * Update counters. |
| 1172 | */ |
| 1173 | buf->pos += count; |
| 1174 | *ppos += count; |
| 1175 | |
| 1176 | /* |
| 1177 | * Queue next buffer if required. |
| 1178 | */ |
| 1179 | if (buf->pos == buf->size || (!read && fileio->write_immediately)) { |
| 1180 | /* |
| 1181 | * Check if this is the last buffer to read. |
| 1182 | */ |
| 1183 | if (read && fileio->read_once && fileio->dq_count == 1) { |
| 1184 | dprintk(3, "read limit reached\n"); |
| 1185 | return __vb2_cleanup_fileio(q); |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * Call vb2_qbuf and give buffer to the driver. |
| 1190 | */ |
| 1191 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 1192 | fileio->b.type = q->type; |
| 1193 | fileio->b.memory = q->memory; |
| 1194 | fileio->b.index = index; |
| 1195 | fileio->b.bytesused = buf->pos; |
| 1196 | if (is_multiplanar) { |
| 1197 | memset(&fileio->p, 0, sizeof(fileio->p)); |
| 1198 | fileio->p.bytesused = buf->pos; |
| 1199 | fileio->b.m.planes = &fileio->p; |
| 1200 | fileio->b.length = 1; |
| 1201 | } |
| 1202 | if (set_timestamp) |
| 1203 | v4l2_get_timestamp(&fileio->b.timestamp); |
| 1204 | ret = vb2_internal_qbuf(q, &fileio->b); |
| 1205 | dprintk(5, "vb2_dbuf result: %d\n", ret); |
| 1206 | if (ret) |
| 1207 | return ret; |
| 1208 | |
| 1209 | /* |
| 1210 | * Buffer has been queued, update the status |
| 1211 | */ |
| 1212 | buf->pos = 0; |
| 1213 | buf->queued = 1; |
| 1214 | buf->size = vb2_plane_size(q->bufs[index], 0); |
| 1215 | fileio->q_count += 1; |
| 1216 | /* |
| 1217 | * If we are queuing up buffers for the first time, then |
| 1218 | * increase initial_index by one. |
| 1219 | */ |
| 1220 | if (fileio->initial_index < q->num_buffers) |
| 1221 | fileio->initial_index++; |
| 1222 | /* |
| 1223 | * The next buffer to use is either a buffer that's going to be |
| 1224 | * queued for the first time (initial_index < q->num_buffers) |
| 1225 | * or it is equal to q->num_buffers, meaning that the next |
| 1226 | * time we need to dequeue a buffer since we've now queued up |
| 1227 | * all the 'first time' buffers. |
| 1228 | */ |
| 1229 | fileio->cur_index = fileio->initial_index; |
| 1230 | } |
| 1231 | |
| 1232 | /* |
| 1233 | * Return proper number of bytes processed. |
| 1234 | */ |
| 1235 | if (ret == 0) |
| 1236 | ret = count; |
| 1237 | return ret; |
| 1238 | } |
| 1239 | |
| 1240 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, |
| 1241 | loff_t *ppos, int nonblocking) |
| 1242 | { |
| 1243 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); |
| 1244 | } |
| 1245 | EXPORT_SYMBOL_GPL(vb2_read); |
| 1246 | |
| 1247 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
| 1248 | loff_t *ppos, int nonblocking) |
| 1249 | { |
| 1250 | return __vb2_perform_fileio(q, (char __user *) data, count, |
| 1251 | ppos, nonblocking, 0); |
| 1252 | } |
| 1253 | EXPORT_SYMBOL_GPL(vb2_write); |
| 1254 | |
| 1255 | struct vb2_threadio_data { |
| 1256 | struct task_struct *thread; |
| 1257 | vb2_thread_fnc fnc; |
| 1258 | void *priv; |
| 1259 | bool stop; |
| 1260 | }; |
| 1261 | |
| 1262 | static int vb2_thread(void *data) |
| 1263 | { |
| 1264 | struct vb2_queue *q = data; |
| 1265 | struct vb2_threadio_data *threadio = q->threadio; |
| 1266 | struct vb2_fileio_data *fileio = q->fileio; |
| 1267 | bool set_timestamp = false; |
| 1268 | int prequeue = 0; |
| 1269 | int index = 0; |
| 1270 | int ret = 0; |
| 1271 | |
| 1272 | if (q->is_output) { |
| 1273 | prequeue = q->num_buffers; |
| 1274 | set_timestamp = |
| 1275 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 1276 | V4L2_BUF_FLAG_TIMESTAMP_COPY; |
| 1277 | } |
| 1278 | |
| 1279 | set_freezable(); |
| 1280 | |
| 1281 | for (;;) { |
| 1282 | struct vb2_buffer *vb; |
| 1283 | |
| 1284 | /* |
| 1285 | * Call vb2_dqbuf to get buffer back. |
| 1286 | */ |
| 1287 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 1288 | fileio->b.type = q->type; |
| 1289 | fileio->b.memory = q->memory; |
| 1290 | if (prequeue) { |
| 1291 | fileio->b.index = index++; |
| 1292 | prequeue--; |
| 1293 | } else { |
| 1294 | call_void_qop(q, wait_finish, q); |
| 1295 | if (!threadio->stop) |
| 1296 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); |
| 1297 | call_void_qop(q, wait_prepare, q); |
| 1298 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); |
| 1299 | } |
| 1300 | if (ret || threadio->stop) |
| 1301 | break; |
| 1302 | try_to_freeze(); |
| 1303 | |
| 1304 | vb = q->bufs[fileio->b.index]; |
| 1305 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) |
| 1306 | if (threadio->fnc(vb, threadio->priv)) |
| 1307 | break; |
| 1308 | call_void_qop(q, wait_finish, q); |
| 1309 | if (set_timestamp) |
| 1310 | v4l2_get_timestamp(&fileio->b.timestamp); |
| 1311 | if (!threadio->stop) |
| 1312 | ret = vb2_internal_qbuf(q, &fileio->b); |
| 1313 | call_void_qop(q, wait_prepare, q); |
| 1314 | if (ret || threadio->stop) |
| 1315 | break; |
| 1316 | } |
| 1317 | |
| 1318 | /* Hmm, linux becomes *very* unhappy without this ... */ |
| 1319 | while (!kthread_should_stop()) { |
| 1320 | set_current_state(TASK_INTERRUPTIBLE); |
| 1321 | schedule(); |
| 1322 | } |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
| 1326 | /* |
| 1327 | * This function should not be used for anything else but the videobuf2-dvb |
| 1328 | * support. If you think you have another good use-case for this, then please |
| 1329 | * contact the linux-media mailinglist first. |
| 1330 | */ |
| 1331 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, |
| 1332 | const char *thread_name) |
| 1333 | { |
| 1334 | struct vb2_threadio_data *threadio; |
| 1335 | int ret = 0; |
| 1336 | |
| 1337 | if (q->threadio) |
| 1338 | return -EBUSY; |
| 1339 | if (vb2_is_busy(q)) |
| 1340 | return -EBUSY; |
| 1341 | if (WARN_ON(q->fileio)) |
| 1342 | return -EBUSY; |
| 1343 | |
| 1344 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); |
| 1345 | if (threadio == NULL) |
| 1346 | return -ENOMEM; |
| 1347 | threadio->fnc = fnc; |
| 1348 | threadio->priv = priv; |
| 1349 | |
| 1350 | ret = __vb2_init_fileio(q, !q->is_output); |
| 1351 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); |
| 1352 | if (ret) |
| 1353 | goto nomem; |
| 1354 | q->threadio = threadio; |
| 1355 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); |
| 1356 | if (IS_ERR(threadio->thread)) { |
| 1357 | ret = PTR_ERR(threadio->thread); |
| 1358 | threadio->thread = NULL; |
| 1359 | goto nothread; |
| 1360 | } |
| 1361 | return 0; |
| 1362 | |
| 1363 | nothread: |
| 1364 | __vb2_cleanup_fileio(q); |
| 1365 | nomem: |
| 1366 | kfree(threadio); |
| 1367 | return ret; |
| 1368 | } |
| 1369 | EXPORT_SYMBOL_GPL(vb2_thread_start); |
| 1370 | |
| 1371 | int vb2_thread_stop(struct vb2_queue *q) |
| 1372 | { |
| 1373 | struct vb2_threadio_data *threadio = q->threadio; |
| 1374 | int err; |
| 1375 | |
| 1376 | if (threadio == NULL) |
| 1377 | return 0; |
| 1378 | threadio->stop = true; |
| 1379 | /* Wake up all pending sleeps in the thread */ |
| 1380 | vb2_queue_error(q); |
| 1381 | err = kthread_stop(threadio->thread); |
| 1382 | __vb2_cleanup_fileio(q); |
| 1383 | threadio->thread = NULL; |
| 1384 | kfree(threadio); |
| 1385 | q->threadio = NULL; |
| 1386 | return err; |
| 1387 | } |
| 1388 | EXPORT_SYMBOL_GPL(vb2_thread_stop); |
| 1389 | |
| 1390 | /* |
| 1391 | * The following functions are not part of the vb2 core API, but are helper |
| 1392 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations |
| 1393 | * and struct vb2_ops. |
| 1394 | * They contain boilerplate code that most if not all drivers have to do |
| 1395 | * and so they simplify the driver code. |
| 1396 | */ |
| 1397 | |
| 1398 | /* The queue is busy if there is a owner and you are not that owner. */ |
| 1399 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) |
| 1400 | { |
| 1401 | return vdev->queue->owner && vdev->queue->owner != file->private_data; |
| 1402 | } |
| 1403 | |
| 1404 | /* vb2 ioctl helpers */ |
| 1405 | |
| 1406 | int vb2_ioctl_reqbufs(struct file *file, void *priv, |
| 1407 | struct v4l2_requestbuffers *p) |
| 1408 | { |
| 1409 | struct video_device *vdev = video_devdata(file); |
| 1410 | int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); |
| 1411 | |
| 1412 | if (res) |
| 1413 | return res; |
| 1414 | if (vb2_queue_is_busy(vdev, file)) |
| 1415 | return -EBUSY; |
| 1416 | res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count); |
| 1417 | /* If count == 0, then the owner has released all buffers and he |
| 1418 | is no longer owner of the queue. Otherwise we have a new owner. */ |
| 1419 | if (res == 0) |
| 1420 | vdev->queue->owner = p->count ? file->private_data : NULL; |
| 1421 | return res; |
| 1422 | } |
| 1423 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); |
| 1424 | |
| 1425 | int vb2_ioctl_create_bufs(struct file *file, void *priv, |
| 1426 | struct v4l2_create_buffers *p) |
| 1427 | { |
| 1428 | struct video_device *vdev = video_devdata(file); |
| 1429 | int res = vb2_verify_memory_type(vdev->queue, p->memory, |
| 1430 | p->format.type); |
| 1431 | |
| 1432 | p->index = vdev->queue->num_buffers; |
| 1433 | /* |
| 1434 | * If count == 0, then just check if memory and type are valid. |
| 1435 | * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. |
| 1436 | */ |
| 1437 | if (p->count == 0) |
| 1438 | return res != -EBUSY ? res : 0; |
| 1439 | if (res) |
| 1440 | return res; |
| 1441 | if (vb2_queue_is_busy(vdev, file)) |
| 1442 | return -EBUSY; |
| 1443 | res = vb2_core_create_bufs(vdev->queue, p->memory, &p->count, |
| 1444 | &p->format); |
| 1445 | if (res == 0) |
| 1446 | vdev->queue->owner = file->private_data; |
| 1447 | return res; |
| 1448 | } |
| 1449 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); |
| 1450 | |
| 1451 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, |
| 1452 | struct v4l2_buffer *p) |
| 1453 | { |
| 1454 | struct video_device *vdev = video_devdata(file); |
| 1455 | |
| 1456 | if (vb2_queue_is_busy(vdev, file)) |
| 1457 | return -EBUSY; |
| 1458 | return vb2_prepare_buf(vdev->queue, p); |
| 1459 | } |
| 1460 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); |
| 1461 | |
| 1462 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 1463 | { |
| 1464 | struct video_device *vdev = video_devdata(file); |
| 1465 | |
| 1466 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ |
| 1467 | return vb2_querybuf(vdev->queue, p); |
| 1468 | } |
| 1469 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); |
| 1470 | |
| 1471 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 1472 | { |
| 1473 | struct video_device *vdev = video_devdata(file); |
| 1474 | |
| 1475 | if (vb2_queue_is_busy(vdev, file)) |
| 1476 | return -EBUSY; |
| 1477 | return vb2_qbuf(vdev->queue, p); |
| 1478 | } |
| 1479 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); |
| 1480 | |
| 1481 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 1482 | { |
| 1483 | struct video_device *vdev = video_devdata(file); |
| 1484 | |
| 1485 | if (vb2_queue_is_busy(vdev, file)) |
| 1486 | return -EBUSY; |
| 1487 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); |
| 1488 | } |
| 1489 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); |
| 1490 | |
| 1491 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) |
| 1492 | { |
| 1493 | struct video_device *vdev = video_devdata(file); |
| 1494 | |
| 1495 | if (vb2_queue_is_busy(vdev, file)) |
| 1496 | return -EBUSY; |
| 1497 | return vb2_streamon(vdev->queue, i); |
| 1498 | } |
| 1499 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); |
| 1500 | |
| 1501 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) |
| 1502 | { |
| 1503 | struct video_device *vdev = video_devdata(file); |
| 1504 | |
| 1505 | if (vb2_queue_is_busy(vdev, file)) |
| 1506 | return -EBUSY; |
| 1507 | return vb2_streamoff(vdev->queue, i); |
| 1508 | } |
| 1509 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); |
| 1510 | |
| 1511 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
| 1512 | { |
| 1513 | struct video_device *vdev = video_devdata(file); |
| 1514 | |
| 1515 | if (vb2_queue_is_busy(vdev, file)) |
| 1516 | return -EBUSY; |
| 1517 | return vb2_expbuf(vdev->queue, p); |
| 1518 | } |
| 1519 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); |
| 1520 | |
| 1521 | /* v4l2_file_operations helpers */ |
| 1522 | |
| 1523 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) |
| 1524 | { |
| 1525 | struct video_device *vdev = video_devdata(file); |
| 1526 | |
| 1527 | return vb2_mmap(vdev->queue, vma); |
| 1528 | } |
| 1529 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); |
| 1530 | |
| 1531 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
| 1532 | { |
| 1533 | struct video_device *vdev = video_devdata(file); |
| 1534 | |
| 1535 | if (lock) |
| 1536 | mutex_lock(lock); |
| 1537 | if (file->private_data == vdev->queue->owner) { |
| 1538 | vb2_queue_release(vdev->queue); |
| 1539 | vdev->queue->owner = NULL; |
| 1540 | } |
| 1541 | if (lock) |
| 1542 | mutex_unlock(lock); |
| 1543 | return v4l2_fh_release(file); |
| 1544 | } |
| 1545 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
| 1546 | |
| 1547 | int vb2_fop_release(struct file *file) |
| 1548 | { |
| 1549 | struct video_device *vdev = video_devdata(file); |
| 1550 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 1551 | |
| 1552 | return _vb2_fop_release(file, lock); |
| 1553 | } |
| 1554 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
| 1555 | |
| 1556 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
| 1557 | size_t count, loff_t *ppos) |
| 1558 | { |
| 1559 | struct video_device *vdev = video_devdata(file); |
| 1560 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 1561 | int err = -EBUSY; |
| 1562 | |
| 1563 | if (!(vdev->queue->io_modes & VB2_WRITE)) |
| 1564 | return -EINVAL; |
| 1565 | if (lock && mutex_lock_interruptible(lock)) |
| 1566 | return -ERESTARTSYS; |
| 1567 | if (vb2_queue_is_busy(vdev, file)) |
| 1568 | goto exit; |
| 1569 | err = vb2_write(vdev->queue, buf, count, ppos, |
| 1570 | file->f_flags & O_NONBLOCK); |
| 1571 | if (vdev->queue->fileio) |
| 1572 | vdev->queue->owner = file->private_data; |
| 1573 | exit: |
| 1574 | if (lock) |
| 1575 | mutex_unlock(lock); |
| 1576 | return err; |
| 1577 | } |
| 1578 | EXPORT_SYMBOL_GPL(vb2_fop_write); |
| 1579 | |
| 1580 | ssize_t vb2_fop_read(struct file *file, char __user *buf, |
| 1581 | size_t count, loff_t *ppos) |
| 1582 | { |
| 1583 | struct video_device *vdev = video_devdata(file); |
| 1584 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 1585 | int err = -EBUSY; |
| 1586 | |
| 1587 | if (!(vdev->queue->io_modes & VB2_READ)) |
| 1588 | return -EINVAL; |
| 1589 | if (lock && mutex_lock_interruptible(lock)) |
| 1590 | return -ERESTARTSYS; |
| 1591 | if (vb2_queue_is_busy(vdev, file)) |
| 1592 | goto exit; |
| 1593 | err = vb2_read(vdev->queue, buf, count, ppos, |
| 1594 | file->f_flags & O_NONBLOCK); |
| 1595 | if (vdev->queue->fileio) |
| 1596 | vdev->queue->owner = file->private_data; |
| 1597 | exit: |
| 1598 | if (lock) |
| 1599 | mutex_unlock(lock); |
| 1600 | return err; |
| 1601 | } |
| 1602 | EXPORT_SYMBOL_GPL(vb2_fop_read); |
| 1603 | |
| 1604 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) |
| 1605 | { |
| 1606 | struct video_device *vdev = video_devdata(file); |
| 1607 | struct vb2_queue *q = vdev->queue; |
| 1608 | struct mutex *lock = q->lock ? q->lock : vdev->lock; |
| 1609 | unsigned res; |
| 1610 | void *fileio; |
| 1611 | |
| 1612 | /* |
| 1613 | * If this helper doesn't know how to lock, then you shouldn't be using |
| 1614 | * it but you should write your own. |
| 1615 | */ |
| 1616 | WARN_ON(!lock); |
| 1617 | |
| 1618 | if (lock && mutex_lock_interruptible(lock)) |
| 1619 | return POLLERR; |
| 1620 | |
| 1621 | fileio = q->fileio; |
| 1622 | |
| 1623 | res = vb2_poll(vdev->queue, file, wait); |
| 1624 | |
| 1625 | /* If fileio was started, then we have a new queue owner. */ |
| 1626 | if (!fileio && q->fileio) |
| 1627 | q->owner = file->private_data; |
| 1628 | if (lock) |
| 1629 | mutex_unlock(lock); |
| 1630 | return res; |
| 1631 | } |
| 1632 | EXPORT_SYMBOL_GPL(vb2_fop_poll); |
| 1633 | |
| 1634 | #ifndef CONFIG_MMU |
| 1635 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, |
| 1636 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 1637 | { |
| 1638 | struct video_device *vdev = video_devdata(file); |
| 1639 | |
| 1640 | return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); |
| 1641 | } |
| 1642 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); |
| 1643 | #endif |
| 1644 | |
| 1645 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ |
| 1646 | |
| 1647 | void vb2_ops_wait_prepare(struct vb2_queue *vq) |
| 1648 | { |
| 1649 | mutex_unlock(vq->lock); |
| 1650 | } |
| 1651 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); |
| 1652 | |
| 1653 | void vb2_ops_wait_finish(struct vb2_queue *vq) |
| 1654 | { |
| 1655 | mutex_lock(vq->lock); |
| 1656 | } |
| 1657 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); |
| 1658 | |
Junghak Sung | c139990 | 2015-09-22 10:30:29 -0300 | [diff] [blame] | 1659 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
| 1660 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
| 1661 | MODULE_LICENSE("GPL"); |