| 1 | /* |
| 2 | * generic helper functions for handling video4linux capture buffers |
| 3 | * |
| 4 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> |
| 5 | * |
| 6 | * Highly based on video-buf written originally by: |
| 7 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> |
| 8 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org> |
| 9 | * (c) 2006 Ted Walther and John Sokol |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 |
| 14 | */ |
| 15 | |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/moduleparam.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | |
| 22 | #include <media/videobuf-core.h> |
| 23 | |
| 24 | #define MAGIC_BUFFER 0x20070728 |
| 25 | #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \ |
| 26 | { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); } |
| 27 | |
| 28 | static int debug = 0; |
| 29 | module_param(debug, int, 0644); |
| 30 | |
| 31 | MODULE_DESCRIPTION("helper module to manage video4linux buffers"); |
| 32 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); |
| 33 | MODULE_LICENSE("GPL"); |
| 34 | |
| 35 | #define dprintk(level, fmt, arg...) if (debug >= level) \ |
| 36 | printk(KERN_DEBUG "vbuf: " fmt , ## arg) |
| 37 | |
| 38 | /* --------------------------------------------------------------------- */ |
| 39 | |
| 40 | #define CALL(q, f, arg...) \ |
| 41 | ( (q->int_ops->f)? q->int_ops->f(arg) : 0) |
| 42 | |
| 43 | void* videobuf_alloc(struct videobuf_queue* q) |
| 44 | { |
| 45 | struct videobuf_buffer *vb; |
| 46 | |
| 47 | BUG_ON (q->msize<sizeof(*vb)); |
| 48 | |
| 49 | if (!q->int_ops || !q->int_ops->alloc) { |
| 50 | printk(KERN_ERR "No specific ops defined!\n"); |
| 51 | BUG(); |
| 52 | } |
| 53 | |
| 54 | vb = q->int_ops->alloc(q->msize); |
| 55 | |
| 56 | if (NULL != vb) { |
| 57 | init_waitqueue_head(&vb->done); |
| 58 | vb->magic = MAGIC_BUFFER; |
| 59 | } |
| 60 | |
| 61 | return vb; |
| 62 | } |
| 63 | |
| 64 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) |
| 65 | { |
| 66 | int retval = 0; |
| 67 | DECLARE_WAITQUEUE(wait, current); |
| 68 | |
| 69 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); |
| 70 | add_wait_queue(&vb->done, &wait); |
| 71 | while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) { |
| 72 | if (non_blocking) { |
| 73 | retval = -EAGAIN; |
| 74 | break; |
| 75 | } |
| 76 | set_current_state(intr ? TASK_INTERRUPTIBLE |
| 77 | : TASK_UNINTERRUPTIBLE); |
| 78 | if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) |
| 79 | schedule(); |
| 80 | set_current_state(TASK_RUNNING); |
| 81 | if (intr && signal_pending(current)) { |
| 82 | dprintk(1,"buffer waiton: -EINTR\n"); |
| 83 | retval = -EINTR; |
| 84 | break; |
| 85 | } |
| 86 | } |
| 87 | remove_wait_queue(&vb->done, &wait); |
| 88 | return retval; |
| 89 | } |
| 90 | |
| 91 | int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb, |
| 92 | struct v4l2_framebuffer *fbuf) |
| 93 | { |
| 94 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); |
| 95 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 96 | |
| 97 | /* FIXME: This is required to avoid OOPS on some cases, since mmap_mapper() |
| 98 | method should be called before _iolock. |
| 99 | On some cases, the mmap_mapper() is called only after scheduling. |
| 100 | |
| 101 | However, this way is just too dirty! Better to wait for some event. |
| 102 | */ |
| 103 | schedule_timeout(HZ); |
| 104 | |
| 105 | return CALL(q,iolock,q,vb,fbuf); |
| 106 | } |
| 107 | |
| 108 | /* --------------------------------------------------------------------- */ |
| 109 | |
| 110 | |
| 111 | void videobuf_queue_core_init(struct videobuf_queue* q, |
| 112 | struct videobuf_queue_ops *ops, |
| 113 | void *dev, |
| 114 | spinlock_t *irqlock, |
| 115 | enum v4l2_buf_type type, |
| 116 | enum v4l2_field field, |
| 117 | unsigned int msize, |
| 118 | void *priv, |
| 119 | struct videobuf_qtype_ops *int_ops) |
| 120 | { |
| 121 | memset(q,0,sizeof(*q)); |
| 122 | q->irqlock = irqlock; |
| 123 | q->dev = dev; |
| 124 | q->type = type; |
| 125 | q->field = field; |
| 126 | q->msize = msize; |
| 127 | q->ops = ops; |
| 128 | q->priv_data = priv; |
| 129 | q->int_ops = int_ops; |
| 130 | |
| 131 | /* All buffer operations are mandatory */ |
| 132 | BUG_ON (!q->ops->buf_setup); |
| 133 | BUG_ON (!q->ops->buf_prepare); |
| 134 | BUG_ON (!q->ops->buf_queue); |
| 135 | BUG_ON (!q->ops->buf_release); |
| 136 | |
| 137 | /* Having implementations for abstract methods are mandatory */ |
| 138 | BUG_ON (!q->int_ops); |
| 139 | |
| 140 | mutex_init(&q->lock); |
| 141 | INIT_LIST_HEAD(&q->stream); |
| 142 | } |
| 143 | |
| 144 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
| 145 | { |
| 146 | int i; |
| 147 | |
| 148 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 149 | |
| 150 | if (q->streaming) { |
| 151 | dprintk(1,"busy: streaming active\n"); |
| 152 | return 1; |
| 153 | } |
| 154 | if (q->reading) { |
| 155 | dprintk(1,"busy: pending read #1\n"); |
| 156 | return 1; |
| 157 | } |
| 158 | if (q->read_buf) { |
| 159 | dprintk(1,"busy: pending read #2\n"); |
| 160 | return 1; |
| 161 | } |
| 162 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 163 | if (NULL == q->bufs[i]) |
| 164 | continue; |
| 165 | if (q->bufs[i]->map) { |
| 166 | dprintk(1,"busy: buffer #%d mapped\n",i); |
| 167 | return 1; |
| 168 | } |
| 169 | if (q->bufs[i]->state == STATE_QUEUED) { |
| 170 | dprintk(1,"busy: buffer #%d queued\n",i); |
| 171 | return 1; |
| 172 | } |
| 173 | if (q->bufs[i]->state == STATE_ACTIVE) { |
| 174 | dprintk(1,"busy: buffer #%d avtive\n",i); |
| 175 | return 1; |
| 176 | } |
| 177 | } |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | void videobuf_queue_cancel(struct videobuf_queue *q) |
| 182 | { |
| 183 | unsigned long flags=0; |
| 184 | int i; |
| 185 | |
| 186 | /* remove queued buffers from list */ |
| 187 | if (q->irqlock) |
| 188 | spin_lock_irqsave(q->irqlock,flags); |
| 189 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 190 | if (NULL == q->bufs[i]) |
| 191 | continue; |
| 192 | if (q->bufs[i]->state == STATE_QUEUED) { |
| 193 | list_del(&q->bufs[i]->queue); |
| 194 | q->bufs[i]->state = STATE_ERROR; |
| 195 | } |
| 196 | } |
| 197 | if (q->irqlock) |
| 198 | spin_unlock_irqrestore(q->irqlock,flags); |
| 199 | |
| 200 | /* free all buffers + clear queue */ |
| 201 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 202 | if (NULL == q->bufs[i]) |
| 203 | continue; |
| 204 | q->ops->buf_release(q,q->bufs[i]); |
| 205 | } |
| 206 | INIT_LIST_HEAD(&q->stream); |
| 207 | } |
| 208 | |
| 209 | /* --------------------------------------------------------------------- */ |
| 210 | |
| 211 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
| 212 | { |
| 213 | enum v4l2_field field = q->field; |
| 214 | |
| 215 | BUG_ON(V4L2_FIELD_ANY == field); |
| 216 | |
| 217 | if (V4L2_FIELD_ALTERNATE == field) { |
| 218 | if (V4L2_FIELD_TOP == q->last) { |
| 219 | field = V4L2_FIELD_BOTTOM; |
| 220 | q->last = V4L2_FIELD_BOTTOM; |
| 221 | } else { |
| 222 | field = V4L2_FIELD_TOP; |
| 223 | q->last = V4L2_FIELD_TOP; |
| 224 | } |
| 225 | } |
| 226 | return field; |
| 227 | } |
| 228 | |
| 229 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
| 230 | struct videobuf_buffer *vb, enum v4l2_buf_type type) |
| 231 | { |
| 232 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); |
| 233 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 234 | |
| 235 | b->index = vb->i; |
| 236 | b->type = type; |
| 237 | |
| 238 | b->memory = vb->memory; |
| 239 | switch (b->memory) { |
| 240 | case V4L2_MEMORY_MMAP: |
| 241 | b->m.offset = vb->boff; |
| 242 | b->length = vb->bsize; |
| 243 | break; |
| 244 | case V4L2_MEMORY_USERPTR: |
| 245 | b->m.userptr = vb->baddr; |
| 246 | b->length = vb->bsize; |
| 247 | break; |
| 248 | case V4L2_MEMORY_OVERLAY: |
| 249 | b->m.offset = vb->boff; |
| 250 | break; |
| 251 | } |
| 252 | |
| 253 | b->flags = 0; |
| 254 | if (vb->map) |
| 255 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
| 256 | |
| 257 | switch (vb->state) { |
| 258 | case STATE_PREPARED: |
| 259 | case STATE_QUEUED: |
| 260 | case STATE_ACTIVE: |
| 261 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
| 262 | break; |
| 263 | case STATE_DONE: |
| 264 | case STATE_ERROR: |
| 265 | b->flags |= V4L2_BUF_FLAG_DONE; |
| 266 | break; |
| 267 | case STATE_NEEDS_INIT: |
| 268 | case STATE_IDLE: |
| 269 | /* nothing */ |
| 270 | break; |
| 271 | } |
| 272 | |
| 273 | if (vb->input != UNSET) { |
| 274 | b->flags |= V4L2_BUF_FLAG_INPUT; |
| 275 | b->input = vb->input; |
| 276 | } |
| 277 | |
| 278 | b->field = vb->field; |
| 279 | b->timestamp = vb->ts; |
| 280 | b->bytesused = vb->size; |
| 281 | b->sequence = vb->field_count >> 1; |
| 282 | } |
| 283 | |
| 284 | int videobuf_reqbufs(struct videobuf_queue *q, |
| 285 | struct v4l2_requestbuffers *req) |
| 286 | { |
| 287 | unsigned int size,count; |
| 288 | int retval; |
| 289 | |
| 290 | if (req->type != q->type) { |
| 291 | dprintk(1,"reqbufs: queue type invalid\n"); |
| 292 | return -EINVAL; |
| 293 | } |
| 294 | if (req->count < 1) { |
| 295 | dprintk(1,"reqbufs: count invalid (%d)\n",req->count); |
| 296 | return -EINVAL; |
| 297 | } |
| 298 | if (req->memory != V4L2_MEMORY_MMAP && |
| 299 | req->memory != V4L2_MEMORY_USERPTR && |
| 300 | req->memory != V4L2_MEMORY_OVERLAY) { |
| 301 | dprintk(1,"reqbufs: memory type invalid\n"); |
| 302 | return -EINVAL; |
| 303 | } |
| 304 | |
| 305 | mutex_lock(&q->lock); |
| 306 | if (q->streaming) { |
| 307 | dprintk(1,"reqbufs: streaming already exists\n"); |
| 308 | retval = -EBUSY; |
| 309 | goto done; |
| 310 | } |
| 311 | if (!list_empty(&q->stream)) { |
| 312 | dprintk(1,"reqbufs: stream running\n"); |
| 313 | retval = -EBUSY; |
| 314 | goto done; |
| 315 | } |
| 316 | |
| 317 | count = req->count; |
| 318 | if (count > VIDEO_MAX_FRAME) |
| 319 | count = VIDEO_MAX_FRAME; |
| 320 | size = 0; |
| 321 | q->ops->buf_setup(q,&count,&size); |
| 322 | size = PAGE_ALIGN(size); |
| 323 | dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n", |
| 324 | count, size, (count*size)>>PAGE_SHIFT); |
| 325 | |
| 326 | retval = videobuf_mmap_setup(q,count,size,req->memory); |
| 327 | if (retval < 0) { |
| 328 | dprintk(1,"reqbufs: mmap setup returned %d\n",retval); |
| 329 | goto done; |
| 330 | } |
| 331 | |
| 332 | req->count = retval; |
| 333 | |
| 334 | done: |
| 335 | mutex_unlock(&q->lock); |
| 336 | return retval; |
| 337 | } |
| 338 | |
| 339 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
| 340 | { |
| 341 | if (unlikely(b->type != q->type)) { |
| 342 | dprintk(1,"querybuf: Wrong type.\n"); |
| 343 | return -EINVAL; |
| 344 | } |
| 345 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) { |
| 346 | dprintk(1,"querybuf: index out of range.\n"); |
| 347 | return -EINVAL; |
| 348 | } |
| 349 | if (unlikely(NULL == q->bufs[b->index])) { |
| 350 | dprintk(1,"querybuf: buffer is null.\n"); |
| 351 | return -EINVAL; |
| 352 | } |
| 353 | videobuf_status(q,b,q->bufs[b->index],q->type); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | int videobuf_qbuf(struct videobuf_queue *q, |
| 358 | struct v4l2_buffer *b) |
| 359 | { |
| 360 | struct videobuf_buffer *buf; |
| 361 | enum v4l2_field field; |
| 362 | unsigned long flags=0; |
| 363 | int retval; |
| 364 | |
| 365 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 366 | |
| 367 | if (b->memory == V4L2_MEMORY_MMAP) |
| 368 | down_read(¤t->mm->mmap_sem); |
| 369 | |
| 370 | mutex_lock(&q->lock); |
| 371 | retval = -EBUSY; |
| 372 | if (q->reading) { |
| 373 | dprintk(1,"qbuf: Reading running...\n"); |
| 374 | goto done; |
| 375 | } |
| 376 | retval = -EINVAL; |
| 377 | if (b->type != q->type) { |
| 378 | dprintk(1,"qbuf: Wrong type.\n"); |
| 379 | goto done; |
| 380 | } |
| 381 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) { |
| 382 | dprintk(1,"qbuf: index out of range.\n"); |
| 383 | goto done; |
| 384 | } |
| 385 | buf = q->bufs[b->index]; |
| 386 | if (NULL == buf) { |
| 387 | dprintk(1,"qbuf: buffer is null.\n"); |
| 388 | goto done; |
| 389 | } |
| 390 | MAGIC_CHECK(buf->magic,MAGIC_BUFFER); |
| 391 | if (buf->memory != b->memory) { |
| 392 | dprintk(1,"qbuf: memory type is wrong.\n"); |
| 393 | goto done; |
| 394 | } |
| 395 | if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) { |
| 396 | dprintk(1,"qbuf: buffer is already queued or active.\n"); |
| 397 | goto done; |
| 398 | } |
| 399 | |
| 400 | if (b->flags & V4L2_BUF_FLAG_INPUT) { |
| 401 | if (b->input >= q->inputs) { |
| 402 | dprintk(1,"qbuf: wrong input.\n"); |
| 403 | goto done; |
| 404 | } |
| 405 | buf->input = b->input; |
| 406 | } else { |
| 407 | buf->input = UNSET; |
| 408 | } |
| 409 | |
| 410 | switch (b->memory) { |
| 411 | case V4L2_MEMORY_MMAP: |
| 412 | if (0 == buf->baddr) { |
| 413 | dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n"); |
| 414 | goto done; |
| 415 | } |
| 416 | break; |
| 417 | case V4L2_MEMORY_USERPTR: |
| 418 | if (b->length < buf->bsize) { |
| 419 | dprintk(1,"qbuf: buffer length is not enough\n"); |
| 420 | goto done; |
| 421 | } |
| 422 | if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr) |
| 423 | q->ops->buf_release(q,buf); |
| 424 | buf->baddr = b->m.userptr; |
| 425 | break; |
| 426 | case V4L2_MEMORY_OVERLAY: |
| 427 | buf->boff = b->m.offset; |
| 428 | break; |
| 429 | default: |
| 430 | dprintk(1,"qbuf: wrong memory type\n"); |
| 431 | goto done; |
| 432 | } |
| 433 | |
| 434 | dprintk(1,"qbuf: requesting next field\n"); |
| 435 | field = videobuf_next_field(q); |
| 436 | retval = q->ops->buf_prepare(q,buf,field); |
| 437 | if (0 != retval) { |
| 438 | dprintk(1,"qbuf: buffer_prepare returned %d\n",retval); |
| 439 | goto done; |
| 440 | } |
| 441 | |
| 442 | list_add_tail(&buf->stream,&q->stream); |
| 443 | if (q->streaming) { |
| 444 | if (q->irqlock) |
| 445 | spin_lock_irqsave(q->irqlock,flags); |
| 446 | q->ops->buf_queue(q,buf); |
| 447 | if (q->irqlock) |
| 448 | spin_unlock_irqrestore(q->irqlock,flags); |
| 449 | } |
| 450 | dprintk(1,"qbuf: succeded\n"); |
| 451 | retval = 0; |
| 452 | |
| 453 | done: |
| 454 | mutex_unlock(&q->lock); |
| 455 | |
| 456 | if (b->memory == V4L2_MEMORY_MMAP) |
| 457 | up_read(¤t->mm->mmap_sem); |
| 458 | |
| 459 | return retval; |
| 460 | } |
| 461 | |
| 462 | int videobuf_dqbuf(struct videobuf_queue *q, |
| 463 | struct v4l2_buffer *b, int nonblocking) |
| 464 | { |
| 465 | struct videobuf_buffer *buf; |
| 466 | int retval; |
| 467 | |
| 468 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 469 | |
| 470 | mutex_lock(&q->lock); |
| 471 | retval = -EBUSY; |
| 472 | if (q->reading) { |
| 473 | dprintk(1,"dqbuf: Reading running...\n"); |
| 474 | goto done; |
| 475 | } |
| 476 | retval = -EINVAL; |
| 477 | if (b->type != q->type) { |
| 478 | dprintk(1,"dqbuf: Wrong type.\n"); |
| 479 | goto done; |
| 480 | } |
| 481 | if (list_empty(&q->stream)) { |
| 482 | dprintk(1,"dqbuf: stream running\n"); |
| 483 | goto done; |
| 484 | } |
| 485 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
| 486 | retval = videobuf_waiton(buf, nonblocking, 1); |
| 487 | if (retval < 0) { |
| 488 | dprintk(1,"dqbuf: waiton returned %d\n",retval); |
| 489 | goto done; |
| 490 | } |
| 491 | switch (buf->state) { |
| 492 | case STATE_ERROR: |
| 493 | dprintk(1,"dqbuf: state is error\n"); |
| 494 | retval = -EIO; |
| 495 | CALL(q,sync,q, buf); |
| 496 | buf->state = STATE_IDLE; |
| 497 | break; |
| 498 | case STATE_DONE: |
| 499 | dprintk(1,"dqbuf: state is done\n"); |
| 500 | CALL(q,sync,q, buf); |
| 501 | buf->state = STATE_IDLE; |
| 502 | break; |
| 503 | default: |
| 504 | dprintk(1,"dqbuf: state invalid\n"); |
| 505 | retval = -EINVAL; |
| 506 | goto done; |
| 507 | } |
| 508 | list_del(&buf->stream); |
| 509 | memset(b,0,sizeof(*b)); |
| 510 | videobuf_status(q,b,buf,q->type); |
| 511 | |
| 512 | done: |
| 513 | mutex_unlock(&q->lock); |
| 514 | return retval; |
| 515 | } |
| 516 | |
| 517 | int videobuf_streamon(struct videobuf_queue *q) |
| 518 | { |
| 519 | struct videobuf_buffer *buf; |
| 520 | unsigned long flags=0; |
| 521 | int retval; |
| 522 | |
| 523 | mutex_lock(&q->lock); |
| 524 | retval = -EBUSY; |
| 525 | if (q->reading) |
| 526 | goto done; |
| 527 | retval = 0; |
| 528 | if (q->streaming) |
| 529 | goto done; |
| 530 | q->streaming = 1; |
| 531 | if (q->irqlock) |
| 532 | spin_lock_irqsave(q->irqlock,flags); |
| 533 | list_for_each_entry(buf, &q->stream, stream) |
| 534 | if (buf->state == STATE_PREPARED) |
| 535 | q->ops->buf_queue(q,buf); |
| 536 | if (q->irqlock) |
| 537 | spin_unlock_irqrestore(q->irqlock,flags); |
| 538 | |
| 539 | done: |
| 540 | mutex_unlock(&q->lock); |
| 541 | return retval; |
| 542 | } |
| 543 | |
| 544 | int videobuf_streamoff(struct videobuf_queue *q) |
| 545 | { |
| 546 | int retval = -EINVAL; |
| 547 | |
| 548 | mutex_lock(&q->lock); |
| 549 | if (!q->streaming) |
| 550 | goto done; |
| 551 | videobuf_queue_cancel(q); |
| 552 | q->streaming = 0; |
| 553 | retval = 0; |
| 554 | |
| 555 | done: |
| 556 | mutex_unlock(&q->lock); |
| 557 | return retval; |
| 558 | } |
| 559 | |
| 560 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
| 561 | char __user *data, |
| 562 | size_t count, loff_t *ppos) |
| 563 | { |
| 564 | enum v4l2_field field; |
| 565 | unsigned long flags=0; |
| 566 | int retval; |
| 567 | |
| 568 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 569 | |
| 570 | /* setup stuff */ |
| 571 | q->read_buf = videobuf_alloc(q); |
| 572 | if (NULL == q->read_buf) |
| 573 | return -ENOMEM; |
| 574 | |
| 575 | q->read_buf->memory = V4L2_MEMORY_USERPTR; |
| 576 | q->read_buf->baddr = (unsigned long)data; |
| 577 | q->read_buf->bsize = count; |
| 578 | |
| 579 | field = videobuf_next_field(q); |
| 580 | retval = q->ops->buf_prepare(q,q->read_buf,field); |
| 581 | if (0 != retval) |
| 582 | goto done; |
| 583 | |
| 584 | /* start capture & wait */ |
| 585 | if (q->irqlock) |
| 586 | spin_lock_irqsave(q->irqlock,flags); |
| 587 | q->ops->buf_queue(q,q->read_buf); |
| 588 | if (q->irqlock) |
| 589 | spin_unlock_irqrestore(q->irqlock,flags); |
| 590 | retval = videobuf_waiton(q->read_buf,0,0); |
| 591 | if (0 == retval) { |
| 592 | CALL(q,sync,q,q->read_buf); |
| 593 | if (STATE_ERROR == q->read_buf->state) |
| 594 | retval = -EIO; |
| 595 | else |
| 596 | retval = q->read_buf->size; |
| 597 | } |
| 598 | |
| 599 | done: |
| 600 | /* cleanup */ |
| 601 | q->ops->buf_release(q,q->read_buf); |
| 602 | kfree(q->read_buf); |
| 603 | q->read_buf = NULL; |
| 604 | return retval; |
| 605 | } |
| 606 | |
| 607 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
| 608 | char __user *data, size_t count, loff_t *ppos, |
| 609 | int nonblocking) |
| 610 | { |
| 611 | enum v4l2_field field; |
| 612 | unsigned long flags=0; |
| 613 | unsigned size, nbufs; |
| 614 | int retval; |
| 615 | |
| 616 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 617 | |
| 618 | mutex_lock(&q->lock); |
| 619 | |
| 620 | nbufs = 1; size = 0; |
| 621 | q->ops->buf_setup(q,&nbufs,&size); |
| 622 | |
| 623 | if (NULL == q->read_buf && |
| 624 | count >= size && |
| 625 | !nonblocking) { |
| 626 | retval = videobuf_read_zerocopy(q,data,count,ppos); |
| 627 | if (retval >= 0 || retval == -EIO) |
| 628 | /* ok, all done */ |
| 629 | goto done; |
| 630 | /* fallback to kernel bounce buffer on failures */ |
| 631 | } |
| 632 | |
| 633 | if (NULL == q->read_buf) { |
| 634 | /* need to capture a new frame */ |
| 635 | retval = -ENOMEM; |
| 636 | q->read_buf = videobuf_alloc(q); |
| 637 | |
| 638 | dprintk(1,"video alloc=0x%p\n", q->read_buf); |
| 639 | if (NULL == q->read_buf) |
| 640 | goto done; |
| 641 | q->read_buf->memory = V4L2_MEMORY_USERPTR; |
| 642 | q->read_buf->bsize = count; /* preferred size */ |
| 643 | field = videobuf_next_field(q); |
| 644 | retval = q->ops->buf_prepare(q,q->read_buf,field); |
| 645 | |
| 646 | if (0 != retval) { |
| 647 | kfree (q->read_buf); |
| 648 | q->read_buf = NULL; |
| 649 | goto done; |
| 650 | } |
| 651 | if (q->irqlock) |
| 652 | spin_lock_irqsave(q->irqlock,flags); |
| 653 | |
| 654 | q->ops->buf_queue(q,q->read_buf); |
| 655 | if (q->irqlock) |
| 656 | spin_unlock_irqrestore(q->irqlock,flags); |
| 657 | q->read_off = 0; |
| 658 | } |
| 659 | |
| 660 | /* wait until capture is done */ |
| 661 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); |
| 662 | if (0 != retval) |
| 663 | goto done; |
| 664 | |
| 665 | CALL(q,sync,q,q->read_buf); |
| 666 | |
| 667 | if (STATE_ERROR == q->read_buf->state) { |
| 668 | /* catch I/O errors */ |
| 669 | q->ops->buf_release(q,q->read_buf); |
| 670 | kfree(q->read_buf); |
| 671 | q->read_buf = NULL; |
| 672 | retval = -EIO; |
| 673 | goto done; |
| 674 | } |
| 675 | |
| 676 | /* Copy to userspace */ |
| 677 | retval=CALL(q,video_copy_to_user,q,data,count,nonblocking); |
| 678 | if (retval<0) |
| 679 | goto done; |
| 680 | |
| 681 | q->read_off += retval; |
| 682 | if (q->read_off == q->read_buf->size) { |
| 683 | /* all data copied, cleanup */ |
| 684 | q->ops->buf_release(q,q->read_buf); |
| 685 | kfree(q->read_buf); |
| 686 | q->read_buf = NULL; |
| 687 | } |
| 688 | |
| 689 | done: |
| 690 | mutex_unlock(&q->lock); |
| 691 | return retval; |
| 692 | } |
| 693 | |
| 694 | int videobuf_read_start(struct videobuf_queue *q) |
| 695 | { |
| 696 | enum v4l2_field field; |
| 697 | unsigned long flags=0; |
| 698 | unsigned int count = 0, size = 0; |
| 699 | int err, i; |
| 700 | |
| 701 | q->ops->buf_setup(q,&count,&size); |
| 702 | if (count < 2) |
| 703 | count = 2; |
| 704 | if (count > VIDEO_MAX_FRAME) |
| 705 | count = VIDEO_MAX_FRAME; |
| 706 | size = PAGE_ALIGN(size); |
| 707 | |
| 708 | err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
| 709 | if (err < 0) |
| 710 | return err; |
| 711 | |
| 712 | count = err; |
| 713 | |
| 714 | for (i = 0; i < count; i++) { |
| 715 | field = videobuf_next_field(q); |
| 716 | err = q->ops->buf_prepare(q,q->bufs[i],field); |
| 717 | if (err) |
| 718 | return err; |
| 719 | list_add_tail(&q->bufs[i]->stream, &q->stream); |
| 720 | } |
| 721 | if (q->irqlock) |
| 722 | spin_lock_irqsave(q->irqlock,flags); |
| 723 | for (i = 0; i < count; i++) |
| 724 | q->ops->buf_queue(q,q->bufs[i]); |
| 725 | if (q->irqlock) |
| 726 | spin_unlock_irqrestore(q->irqlock,flags); |
| 727 | q->reading = 1; |
| 728 | return 0; |
| 729 | } |
| 730 | |
| 731 | void videobuf_read_stop(struct videobuf_queue *q) |
| 732 | { |
| 733 | int i; |
| 734 | |
| 735 | videobuf_queue_cancel(q); |
| 736 | videobuf_mmap_free(q); |
| 737 | INIT_LIST_HEAD(&q->stream); |
| 738 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 739 | if (NULL == q->bufs[i]) |
| 740 | continue; |
| 741 | kfree(q->bufs[i]); |
| 742 | q->bufs[i] = NULL; |
| 743 | } |
| 744 | q->read_buf = NULL; |
| 745 | q->reading = 0; |
| 746 | } |
| 747 | |
| 748 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
| 749 | char __user *data, size_t count, loff_t *ppos, |
| 750 | int vbihack, int nonblocking) |
| 751 | { |
| 752 | int rc, retval; |
| 753 | unsigned long flags=0; |
| 754 | |
| 755 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 756 | |
| 757 | dprintk(2,"%s\n",__FUNCTION__); |
| 758 | mutex_lock(&q->lock); |
| 759 | retval = -EBUSY; |
| 760 | if (q->streaming) |
| 761 | goto done; |
| 762 | if (!q->reading) { |
| 763 | retval = videobuf_read_start(q); |
| 764 | if (retval < 0) |
| 765 | goto done; |
| 766 | } |
| 767 | |
| 768 | retval = 0; |
| 769 | while (count > 0) { |
| 770 | /* get / wait for data */ |
| 771 | if (NULL == q->read_buf) { |
| 772 | q->read_buf = list_entry(q->stream.next, |
| 773 | struct videobuf_buffer, |
| 774 | stream); |
| 775 | list_del(&q->read_buf->stream); |
| 776 | q->read_off = 0; |
| 777 | } |
| 778 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); |
| 779 | if (rc < 0) { |
| 780 | if (0 == retval) |
| 781 | retval = rc; |
| 782 | break; |
| 783 | } |
| 784 | |
| 785 | if (q->read_buf->state == STATE_DONE) { |
| 786 | rc = CALL (q,copy_stream, q, data + retval, count, |
| 787 | retval, vbihack, nonblocking); |
| 788 | if (rc < 0) { |
| 789 | retval = rc; |
| 790 | break; |
| 791 | } |
| 792 | retval += rc; |
| 793 | count -= rc; |
| 794 | q->read_off += rc; |
| 795 | } else { |
| 796 | /* some error */ |
| 797 | q->read_off = q->read_buf->size; |
| 798 | if (0 == retval) |
| 799 | retval = -EIO; |
| 800 | } |
| 801 | |
| 802 | /* requeue buffer when done with copying */ |
| 803 | if (q->read_off == q->read_buf->size) { |
| 804 | list_add_tail(&q->read_buf->stream, |
| 805 | &q->stream); |
| 806 | if (q->irqlock) |
| 807 | spin_lock_irqsave(q->irqlock,flags); |
| 808 | q->ops->buf_queue(q,q->read_buf); |
| 809 | if (q->irqlock) |
| 810 | spin_unlock_irqrestore(q->irqlock,flags); |
| 811 | q->read_buf = NULL; |
| 812 | } |
| 813 | if (retval < 0) |
| 814 | break; |
| 815 | } |
| 816 | |
| 817 | done: |
| 818 | mutex_unlock(&q->lock); |
| 819 | return retval; |
| 820 | } |
| 821 | |
| 822 | unsigned int videobuf_poll_stream(struct file *file, |
| 823 | struct videobuf_queue *q, |
| 824 | poll_table *wait) |
| 825 | { |
| 826 | struct videobuf_buffer *buf = NULL; |
| 827 | unsigned int rc = 0; |
| 828 | |
| 829 | mutex_lock(&q->lock); |
| 830 | if (q->streaming) { |
| 831 | if (!list_empty(&q->stream)) |
| 832 | buf = list_entry(q->stream.next, |
| 833 | struct videobuf_buffer, stream); |
| 834 | } else { |
| 835 | if (!q->reading) |
| 836 | videobuf_read_start(q); |
| 837 | if (!q->reading) { |
| 838 | rc = POLLERR; |
| 839 | } else if (NULL == q->read_buf) { |
| 840 | q->read_buf = list_entry(q->stream.next, |
| 841 | struct videobuf_buffer, |
| 842 | stream); |
| 843 | list_del(&q->read_buf->stream); |
| 844 | q->read_off = 0; |
| 845 | } |
| 846 | buf = q->read_buf; |
| 847 | } |
| 848 | if (!buf) |
| 849 | rc = POLLERR; |
| 850 | |
| 851 | if (0 == rc) { |
| 852 | poll_wait(file, &buf->done, wait); |
| 853 | if (buf->state == STATE_DONE || |
| 854 | buf->state == STATE_ERROR) |
| 855 | rc = POLLIN|POLLRDNORM; |
| 856 | } |
| 857 | mutex_unlock(&q->lock); |
| 858 | return rc; |
| 859 | } |
| 860 | |
| 861 | int videobuf_mmap_setup(struct videobuf_queue *q, |
| 862 | unsigned int bcount, unsigned int bsize, |
| 863 | enum v4l2_memory memory) |
| 864 | { |
| 865 | unsigned int i; |
| 866 | int err; |
| 867 | |
| 868 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 869 | |
| 870 | err = videobuf_mmap_free(q); |
| 871 | if (0 != err) |
| 872 | return err; |
| 873 | |
| 874 | /* Allocate and initialize buffers */ |
| 875 | for (i = 0; i < bcount; i++) { |
| 876 | q->bufs[i] = videobuf_alloc(q); |
| 877 | |
| 878 | if (q->bufs[i] == NULL) |
| 879 | break; |
| 880 | |
| 881 | q->bufs[i]->i = i; |
| 882 | q->bufs[i]->input = UNSET; |
| 883 | q->bufs[i]->memory = memory; |
| 884 | q->bufs[i]->bsize = bsize; |
| 885 | switch (memory) { |
| 886 | case V4L2_MEMORY_MMAP: |
| 887 | q->bufs[i]->boff = bsize * i; |
| 888 | break; |
| 889 | case V4L2_MEMORY_USERPTR: |
| 890 | case V4L2_MEMORY_OVERLAY: |
| 891 | /* nothing */ |
| 892 | break; |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | if (!i) |
| 897 | return -ENOMEM; |
| 898 | |
| 899 | dprintk(1,"mmap setup: %d buffers, %d bytes each\n", |
| 900 | i, bsize); |
| 901 | |
| 902 | return i; |
| 903 | } |
| 904 | |
| 905 | int videobuf_mmap_free(struct videobuf_queue *q) |
| 906 | { |
| 907 | int i; |
| 908 | int rc; |
| 909 | |
| 910 | if (!q) |
| 911 | return 0; |
| 912 | |
| 913 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 914 | |
| 915 | rc = CALL(q,mmap_free,q); |
| 916 | if (rc<0) |
| 917 | return rc; |
| 918 | |
| 919 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 920 | if (NULL == q->bufs[i]) |
| 921 | continue; |
| 922 | q->ops->buf_release(q,q->bufs[i]); |
| 923 | kfree(q->bufs[i]); |
| 924 | q->bufs[i] = NULL; |
| 925 | } |
| 926 | |
| 927 | return rc; |
| 928 | } |
| 929 | |
| 930 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
| 931 | struct vm_area_struct *vma) |
| 932 | { |
| 933 | int retval; |
| 934 | |
| 935 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 936 | |
| 937 | mutex_lock(&q->lock); |
| 938 | retval=CALL(q,mmap_mapper,q,vma); |
| 939 | mutex_unlock(&q->lock); |
| 940 | |
| 941 | return retval; |
| 942 | } |
| 943 | |
| 944 | #ifdef CONFIG_VIDEO_V4L1_COMPAT |
| 945 | int videobuf_cgmbuf(struct videobuf_queue *q, |
| 946 | struct video_mbuf *mbuf, int count) |
| 947 | { |
| 948 | struct v4l2_requestbuffers req; |
| 949 | int rc,i; |
| 950 | |
| 951 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); |
| 952 | |
| 953 | memset(&req,0,sizeof(req)); |
| 954 | req.type = q->type; |
| 955 | req.count = count; |
| 956 | req.memory = V4L2_MEMORY_MMAP; |
| 957 | rc = videobuf_reqbufs(q,&req); |
| 958 | if (rc < 0) |
| 959 | return rc; |
| 960 | |
| 961 | mbuf->frames = req.count; |
| 962 | mbuf->size = 0; |
| 963 | for (i = 0; i < mbuf->frames; i++) { |
| 964 | mbuf->offsets[i] = q->bufs[i]->boff; |
| 965 | mbuf->size += q->bufs[i]->bsize; |
| 966 | } |
| 967 | |
| 968 | return 0; |
| 969 | } |
| 970 | #endif |
| 971 | |
| 972 | /* --------------------------------------------------------------------- */ |
| 973 | |
| 974 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
| 975 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
| 976 | |
| 977 | EXPORT_SYMBOL_GPL(videobuf_alloc); |
| 978 | |
| 979 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
| 980 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
| 981 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
| 982 | |
| 983 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
| 984 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
| 985 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
| 986 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
| 987 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
| 988 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
| 989 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
| 990 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
| 991 | |
| 992 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
| 993 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
| 994 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
| 995 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
| 996 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
| 997 | |
| 998 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
| 999 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
| 1000 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |
| 1001 | |
| 1002 | /* |
| 1003 | * Local variables: |
| 1004 | * c-basic-offset: 8 |
| 1005 | * End: |
| 1006 | */ |