git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/video-buf.c

   1 /*
   2  *
   3  * generic helper functions for video4linux capture buffers, to handle
   4  * memory management and PCI DMA.
   5  * Right now, bttv, saa7134, saa7146 and cx88 use it.
   6  *
   7  * The functions expect the hardware being able to scatter gatter
   8  * (i.e. the buffers are not linear in physical memory, but fragmented
   9  * into PAGE_SIZE chunks).  They also assume the driver does not need
  10  * to touch the video data.
  11  *
  12  * device specific map/unmap/sync stuff now are mapped as operations
  13  * to allow its usage by USB and virtual devices.
  14  *
  15  * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
  16  * (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
  17  * (c) 2006 Ted Walther and John Sokol
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  */
  24
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/pagemap.h>
  30 #include <linux/slab.h>
  31 #include <linux/pci.h>
  32 #include <linux/interrupt.h>
  33 #include <asm/page.h>
  34 #include <asm/pgtable.h>
  35
  36 #include <media/video-buf.h>
  37
  38 #define MAGIC_DMABUF 0x19721112
  39 #define MAGIC_BUFFER 0x20040302
  40 #define MAGIC_CHECK(is,should)  if (unlikely((is) != (should))) \
  41         { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
  42
  43 static int debug = 0;
  44 module_param(debug, int, 0644);
  45
  46 MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
  47 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  48 MODULE_LICENSE("GPL");
  49
  50 #define dprintk(level, fmt, arg...)     if (debug >= level) \
  51         printk(KERN_DEBUG "vbuf: " fmt , ## arg)
  52
  53 struct scatterlist*
  54 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
  55 {
  56         struct scatterlist *sglist;
  57         struct page *pg;
  58         int i;
  59
  60         sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
  61         if (NULL == sglist)
  62                 return NULL;
  63         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
  64                 pg = vmalloc_to_page(virt);
  65                 if (NULL == pg)
  66                         goto err;
  67                 BUG_ON(PageHighMem(pg));
  68                 sglist[i].page   = pg;
  69                 sglist[i].length = PAGE_SIZE;
  70         }
  71         return sglist;
  72
  73  err:
  74         kfree(sglist);
  75         return NULL;
  76 }
  77
  78 struct scatterlist*
  79 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
  80 {
  81         struct scatterlist *sglist;
  82         int i = 0;
  83
  84         if (NULL == pages[0])
  85                 return NULL;
  86         sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
  87         if (NULL == sglist)
  88                 return NULL;
  89
  90         if (NULL == pages[0])
  91                 goto nopage;
  92         if (PageHighMem(pages[0]))
  93                 /* DMA to highmem pages might not work */
  94                 goto highmem;
  95         sglist[0].page   = pages[0];
  96         sglist[0].offset = offset;
  97         sglist[0].length = PAGE_SIZE - offset;
  98         for (i = 1; i < nr_pages; i++) {
  99                 if (NULL == pages[i])
 100                         goto nopage;
 101                 if (PageHighMem(pages[i]))
 102                         goto highmem;
 103                 sglist[i].page   = pages[i];
 104                 sglist[i].length = PAGE_SIZE;
 105         }
 106         return sglist;
 107
 108  nopage:
 109         dprintk(2,"sgl: oops - no page\n");
 110         kfree(sglist);
 111         return NULL;
 112
 113  highmem:
 114         dprintk(2,"sgl: oops - highmem page\n");
 115         kfree(sglist);
 116         return NULL;
 117 }
 118
 119 /* --------------------------------------------------------------------- */
 120
 121 void videobuf_dma_init(struct videobuf_dmabuf *dma)
 122 {
 123         memset(dma,0,sizeof(*dma));
 124         dma->magic = MAGIC_DMABUF;
 125 }
 126
 127 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
 128                            unsigned long data, unsigned long size)
 129 {
 130         unsigned long first,last;
 131         int err, rw = 0;
 132
 133         dma->direction = direction;
 134         switch (dma->direction) {
 135         case PCI_DMA_FROMDEVICE: rw = READ;  break;
 136         case PCI_DMA_TODEVICE:   rw = WRITE; break;
 137         default:                 BUG();
 138         }
 139
 140         first = (data          & PAGE_MASK) >> PAGE_SHIFT;
 141         last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
 142         dma->offset   = data & ~PAGE_MASK;
 143         dma->nr_pages = last-first+1;
 144         dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
 145                              GFP_KERNEL);
 146         if (NULL == dma->pages)
 147                 return -ENOMEM;
 148         dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
 149                 data,size,dma->nr_pages);
 150
 151         down_read(&current->mm->mmap_sem);
 152         err = get_user_pages(current,current->mm,
 153                              data & PAGE_MASK, dma->nr_pages,
 154                              rw == READ, 1, /* force */
 155                              dma->pages, NULL);
 156         up_read(&current->mm->mmap_sem);
 157         if (err != dma->nr_pages) {
 158                 dma->nr_pages = (err >= 0) ? err : 0;
 159                 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
 160                 return err < 0 ? err : -EINVAL;
 161         }
 162         return 0;
 163 }
 164
 165 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
 166                              int nr_pages)
 167 {
 168         dprintk(1,"init kernel [%d pages]\n",nr_pages);
 169         dma->direction = direction;
 170         dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
 171         if (NULL == dma->vmalloc) {
 172                 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
 173                 return -ENOMEM;
 174         }
 175         dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
 176                                 (unsigned long)dma->vmalloc,
 177                                 nr_pages << PAGE_SHIFT);
 178         memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
 179         dma->nr_pages = nr_pages;
 180         return 0;
 181 }
 182
 183 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
 184                               dma_addr_t addr, int nr_pages)
 185 {
 186         dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
 187                 nr_pages,(unsigned long)addr);
 188         dma->direction = direction;
 189         if (0 == addr)
 190                 return -EINVAL;
 191
 192         dma->bus_addr = addr;
 193         dma->nr_pages = nr_pages;
 194         return 0;
 195 }
 196
 197 int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 198 {
 199         void                   *dev=q->dev;
 200
 201         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 202         BUG_ON(0 == dma->nr_pages);
 203
 204         if (dma->pages) {
 205                 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
 206                                                    dma->offset);
 207         }
 208         if (dma->vmalloc) {
 209                 dma->sglist = videobuf_vmalloc_to_sg
 210                                                 (dma->vmalloc,dma->nr_pages);
 211         }
 212         if (dma->bus_addr) {
 213                 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
 214                 if (NULL != dma->sglist) {
 215                         dma->sglen  = 1;
 216                         sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
 217                         dma->sglist[0].offset           = dma->bus_addr & ~PAGE_MASK;
 218                         sg_dma_len(&dma->sglist[0])     = dma->nr_pages * PAGE_SIZE;
 219                 }
 220         }
 221         if (NULL == dma->sglist) {
 222                 dprintk(1,"scatterlist is NULL\n");
 223                 return -ENOMEM;
 224         }
 225         if (!dma->bus_addr) {
 226                 if (q->ops->vb_map_sg) {
 227                         dma->sglen = q->ops->vb_map_sg(dev,dma->sglist,
 228                                         dma->nr_pages, dma->direction);
 229                 }
 230                 if (0 == dma->sglen) {
 231                         printk(KERN_WARNING
 232                                "%s: videobuf_map_sg failed\n",__FUNCTION__);
 233                         kfree(dma->sglist);
 234                         dma->sglist = NULL;
 235                         dma->sglen = 0;
 236                         return -EIO;
 237                 }
 238         }
 239         return 0;
 240 }
 241
 242 int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 243 {
 244         void                   *dev=q->dev;
 245
 246         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 247         BUG_ON(!dma->sglen);
 248
 249         if (!dma->bus_addr && q->ops->vb_dma_sync_sg)
 250                 q->ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
 251                                                         dma->direction);
 252
 253         return 0;
 254 }
 255
 256 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 257 {
 258         void                   *dev=q->dev;
 259
 260         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 261         if (!dma->sglen)
 262                 return 0;
 263
 264         if (!dma->bus_addr && q->ops->vb_unmap_sg)
 265                         q->ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
 266                                                         dma->direction);
 267         kfree(dma->sglist);
 268         dma->sglist = NULL;
 269         dma->sglen = 0;
 270         return 0;
 271 }
 272
 273 int videobuf_dma_free(struct videobuf_dmabuf *dma)
 274 {
 275         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 276         BUG_ON(dma->sglen);
 277
 278         if (dma->pages) {
 279                 int i;
 280                 for (i=0; i < dma->nr_pages; i++)
 281                         page_cache_release(dma->pages[i]);
 282                 kfree(dma->pages);
 283                 dma->pages = NULL;
 284         }
 285
 286         vfree(dma->vmalloc);
 287         dma->vmalloc = NULL;
 288
 289         if (dma->bus_addr) {
 290                 dma->bus_addr = 0;
 291         }
 292         dma->direction = PCI_DMA_NONE;
 293         return 0;
 294 }
 295
 296 /* --------------------------------------------------------------------- */
 297
 298 void* videobuf_alloc(unsigned int size)
 299 {
 300         struct videobuf_buffer *vb;
 301
 302         vb = kzalloc(size,GFP_KERNEL);
 303         if (NULL != vb) {
 304                 videobuf_dma_init(&vb->dma);
 305                 init_waitqueue_head(&vb->done);
 306                 vb->magic     = MAGIC_BUFFER;
 307         }
 308         return vb;
 309 }
 310
 311 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
 312 {
 313         int retval = 0;
 314         DECLARE_WAITQUEUE(wait, current);
 315
 316         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
 317         add_wait_queue(&vb->done, &wait);
 318         while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
 319                 if (non_blocking) {
 320                         retval = -EAGAIN;
 321                         break;
 322                 }
 323                 set_current_state(intr  ? TASK_INTERRUPTIBLE
 324                                         : TASK_UNINTERRUPTIBLE);
 325                 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
 326                         schedule();
 327                 set_current_state(TASK_RUNNING);
 328                 if (intr && signal_pending(current)) {
 329                         dprintk(1,"buffer waiton: -EINTR\n");
 330                         retval = -EINTR;
 331                         break;
 332                 }
 333         }
 334         remove_wait_queue(&vb->done, &wait);
 335         return retval;
 336 }
 337
 338 int
 339 videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
 340                 struct v4l2_framebuffer *fbuf)
 341 {
 342         int err,pages;
 343         dma_addr_t bus;
 344
 345         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
 346         switch (vb->memory) {
 347         case V4L2_MEMORY_MMAP:
 348         case V4L2_MEMORY_USERPTR:
 349                 if (0 == vb->baddr) {
 350                         /* no userspace addr -- kernel bounce buffer */
 351                         pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
 352                         err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
 353                                                        pages);
 354                         if (0 != err)
 355                                 return err;
 356                 } else {
 357                         /* dma directly to userspace */
 358                         err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
 359                                                      vb->baddr,vb->bsize);
 360                         if (0 != err)
 361                                 return err;
 362                 }
 363                 break;
 364         case V4L2_MEMORY_OVERLAY:
 365                 if (NULL == fbuf)
 366                         return -EINVAL;
 367                 /* FIXME: need sanity checks for vb->boff */
 368                 bus   = (dma_addr_t)fbuf->base + vb->boff;
 369                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
 370                 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
 371                                                 bus, pages);
 372                 if (0 != err)
 373                         return err;
 374                 break;
 375         default:
 376                 BUG();
 377         }
 378         err = videobuf_dma_map(q,&vb->dma);
 379         if (0 != err)
 380                 return err;
 381
 382         return 0;
 383 }
 384
 385 /* --------------------------------------------------------------------- */
 386
 387 void videobuf_queue_pci(struct videobuf_queue* q)
 388 {
 389         /* If not specified, defaults to PCI map sg */
 390         if (!q->ops->vb_map_sg)
 391                 q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 392
 393         if (!q->ops->vb_dma_sync_sg)
 394                 q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
 395         if (!q->ops->vb_unmap_sg)
 396                 q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 397 }
 398
 399 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
 400 {
 401         struct videobuf_queue q;
 402
 403         q.dev=pci;
 404         q.ops->vb_map_sg=(vb_map_sg_t *)pci_unmap_sg;
 405
 406         return (videobuf_dma_unmap(&q,dma));
 407 }
 408
 409 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
 410 {
 411         struct videobuf_queue q;
 412
 413         q.dev=pci;
 414         q.ops->vb_map_sg=(vb_map_sg_t *)pci_unmap_sg;
 415
 416         return (videobuf_dma_unmap(&q,dma));
 417 }
 418
 419 void videobuf_queue_init(struct videobuf_queue* q,
 420                          struct videobuf_queue_ops *ops,
 421                          void *dev,
 422                          spinlock_t *irqlock,
 423                          enum v4l2_buf_type type,
 424                          enum v4l2_field field,
 425                          unsigned int msize,
 426                          void *priv)
 427 {
 428         memset(q,0,sizeof(*q));
 429         q->irqlock = irqlock;
 430         q->dev     = dev;
 431         q->type    = type;
 432         q->field   = field;
 433         q->msize   = msize;
 434         q->ops     = ops;
 435         q->priv_data = priv;
 436
 437         videobuf_queue_pci(q);
 438
 439         mutex_init(&q->lock);
 440         INIT_LIST_HEAD(&q->stream);
 441 }
 442
 443 int
 444 videobuf_queue_is_busy(struct videobuf_queue *q)
 445 {
 446         int i;
 447
 448         if (q->streaming) {
 449                 dprintk(1,"busy: streaming active\n");
 450                 return 1;
 451         }
 452         if (q->reading) {
 453                 dprintk(1,"busy: pending read #1\n");
 454                 return 1;
 455         }
 456         if (q->read_buf) {
 457                 dprintk(1,"busy: pending read #2\n");
 458                 return 1;
 459         }
 460         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 461                 if (NULL == q->bufs[i])
 462                         continue;
 463                 if (q->bufs[i]->map) {
 464                         dprintk(1,"busy: buffer #%d mapped\n",i);
 465                         return 1;
 466                 }
 467                 if (q->bufs[i]->state == STATE_QUEUED) {
 468                         dprintk(1,"busy: buffer #%d queued\n",i);
 469                         return 1;
 470                 }
 471                 if (q->bufs[i]->state == STATE_ACTIVE) {
 472                         dprintk(1,"busy: buffer #%d avtive\n",i);
 473                         return 1;
 474                 }
 475         }
 476         return 0;
 477 }
 478
 479 void
 480 videobuf_queue_cancel(struct videobuf_queue *q)
 481 {
 482         unsigned long flags=0;
 483         int i;
 484
 485         /* remove queued buffers from list */
 486         if (q->irqlock)
 487                 spin_lock_irqsave(q->irqlock,flags);
 488         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 489                 if (NULL == q->bufs[i])
 490                         continue;
 491                 if (q->bufs[i]->state == STATE_QUEUED) {
 492                         list_del(&q->bufs[i]->queue);
 493                         q->bufs[i]->state = STATE_ERROR;
 494                 }
 495         }
 496         if (q->irqlock)
 497                 spin_unlock_irqrestore(q->irqlock,flags);
 498
 499         /* free all buffers + clear queue */
 500         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 501                 if (NULL == q->bufs[i])
 502                         continue;
 503                 q->ops->buf_release(q,q->bufs[i]);
 504         }
 505         INIT_LIST_HEAD(&q->stream);
 506 }
 507
 508 /* --------------------------------------------------------------------- */
 509
 510 enum v4l2_field
 511 videobuf_next_field(struct videobuf_queue *q)
 512 {
 513         enum v4l2_field field = q->field;
 514
 515         BUG_ON(V4L2_FIELD_ANY == field);
 516
 517         if (V4L2_FIELD_ALTERNATE == field) {
 518                 if (V4L2_FIELD_TOP == q->last) {
 519                         field   = V4L2_FIELD_BOTTOM;
 520                         q->last = V4L2_FIELD_BOTTOM;
 521                 } else {
 522                         field   = V4L2_FIELD_TOP;
 523                         q->last = V4L2_FIELD_TOP;
 524                 }
 525         }
 526         return field;
 527 }
 528
 529 void
 530 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
 531                 enum v4l2_buf_type type)
 532 {
 533         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
 534
 535         b->index    = vb->i;
 536         b->type     = type;
 537
 538         b->memory   = vb->memory;
 539         switch (b->memory) {
 540         case V4L2_MEMORY_MMAP:
 541                 b->m.offset  = vb->boff;
 542                 b->length    = vb->bsize;
 543                 break;
 544         case V4L2_MEMORY_USERPTR:
 545                 b->m.userptr = vb->baddr;
 546                 b->length    = vb->bsize;
 547                 break;
 548         case V4L2_MEMORY_OVERLAY:
 549                 b->m.offset  = vb->boff;
 550                 break;
 551         }
 552
 553         b->flags    = 0;
 554         if (vb->map)
 555                 b->flags |= V4L2_BUF_FLAG_MAPPED;
 556
 557         switch (vb->state) {
 558         case STATE_PREPARED:
 559         case STATE_QUEUED:
 560         case STATE_ACTIVE:
 561                 b->flags |= V4L2_BUF_FLAG_QUEUED;
 562                 break;
 563         case STATE_DONE:
 564         case STATE_ERROR:
 565                 b->flags |= V4L2_BUF_FLAG_DONE;
 566                 break;
 567         case STATE_NEEDS_INIT:
 568         case STATE_IDLE:
 569                 /* nothing */
 570                 break;
 571         }
 572
 573         if (vb->input != UNSET) {
 574                 b->flags |= V4L2_BUF_FLAG_INPUT;
 575                 b->input  = vb->input;
 576         }
 577
 578         b->field     = vb->field;
 579         b->timestamp = vb->ts;
 580         b->bytesused = vb->size;
 581         b->sequence  = vb->field_count >> 1;
 582 }
 583
 584 int
 585 videobuf_reqbufs(struct videobuf_queue *q,
 586                  struct v4l2_requestbuffers *req)
 587 {
 588         unsigned int size,count;
 589         int retval;
 590
 591         if (req->type != q->type) {
 592                 dprintk(1,"reqbufs: queue type invalid\n");
 593                 return -EINVAL;
 594         }
 595         if (req->count < 1) {
 596                 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
 597                 return -EINVAL;
 598         }
 599         if (req->memory != V4L2_MEMORY_MMAP     &&
 600             req->memory != V4L2_MEMORY_USERPTR  &&
 601             req->memory != V4L2_MEMORY_OVERLAY) {
 602                 dprintk(1,"reqbufs: memory type invalid\n");
 603                 return -EINVAL;
 604         }
 605
 606         if (q->streaming) {
 607                 dprintk(1,"reqbufs: streaming already exists\n");
 608                 return -EBUSY;
 609         }
 610         if (!list_empty(&q->stream)) {
 611                 dprintk(1,"reqbufs: stream running\n");
 612                 return -EBUSY;
 613         }
 614
 615         mutex_lock(&q->lock);
 616         count = req->count;
 617         if (count > VIDEO_MAX_FRAME)
 618                 count = VIDEO_MAX_FRAME;
 619         size = 0;
 620         q->ops->buf_setup(q,&count,&size);
 621         size = PAGE_ALIGN(size);
 622         dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
 623                 count, size, (count*size)>>PAGE_SHIFT);
 624
 625         retval = videobuf_mmap_setup(q,count,size,req->memory);
 626         if (retval < 0) {
 627                 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
 628                 goto done;
 629         }
 630
 631         req->count = count;
 632
 633  done:
 634         mutex_unlock(&q->lock);
 635         return retval;
 636 }
 637
 638 int
 639 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
 640 {
 641         if (unlikely(b->type != q->type)) {
 642                 dprintk(1,"querybuf: Wrong type.\n");
 643                 return -EINVAL;
 644         }
 645         if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
 646                 dprintk(1,"querybuf: index out of range.\n");
 647                 return -EINVAL;
 648         }
 649         if (unlikely(NULL == q->bufs[b->index])) {
 650                 dprintk(1,"querybuf: buffer is null.\n");
 651                 return -EINVAL;
 652         }
 653         videobuf_status(b,q->bufs[b->index],q->type);
 654         return 0;
 655 }
 656
 657 int
 658 videobuf_qbuf(struct videobuf_queue *q,
 659               struct v4l2_buffer *b)
 660 {
 661         struct videobuf_buffer *buf;
 662         enum v4l2_field field;
 663         unsigned long flags=0;
 664         int retval;
 665
 666         mutex_lock(&q->lock);
 667         retval = -EBUSY;
 668         if (q->reading) {
 669                 dprintk(1,"qbuf: Reading running...\n");
 670                 goto done;
 671         }
 672         retval = -EINVAL;
 673         if (b->type != q->type) {
 674                 dprintk(1,"qbuf: Wrong type.\n");
 675                 goto done;
 676         }
 677         if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
 678                 dprintk(1,"qbuf: index out of range.\n");
 679                 goto done;
 680         }
 681         buf = q->bufs[b->index];
 682         if (NULL == buf) {
 683                 dprintk(1,"qbuf: buffer is null.\n");
 684                 goto done;
 685         }
 686         MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
 687         if (buf->memory != b->memory) {
 688                 dprintk(1,"qbuf: memory type is wrong.\n");
 689                 goto done;
 690         }
 691         if (buf->state == STATE_QUEUED ||
 692             buf->state == STATE_ACTIVE) {
 693                 dprintk(1,"qbuf: buffer is already queued or active.\n");
 694                 goto done;
 695         }
 696
 697         if (b->flags & V4L2_BUF_FLAG_INPUT) {
 698                 if (b->input >= q->inputs) {
 699                         dprintk(1,"qbuf: wrong input.\n");
 700                         goto done;
 701                 }
 702                 buf->input = b->input;
 703         } else {
 704                 buf->input = UNSET;
 705         }
 706
 707         switch (b->memory) {
 708         case V4L2_MEMORY_MMAP:
 709                 if (0 == buf->baddr) {
 710                         dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
 711                         goto done;
 712                 }
 713                 break;
 714         case V4L2_MEMORY_USERPTR:
 715                 if (b->length < buf->bsize) {
 716                         dprintk(1,"qbuf: buffer length is not enough\n");
 717                         goto done;
 718                 }
 719                 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
 720                         q->ops->buf_release(q,buf);
 721                 buf->baddr = b->m.userptr;
 722                 break;
 723         case V4L2_MEMORY_OVERLAY:
 724                 buf->boff = b->m.offset;
 725                 break;
 726         default:
 727                 dprintk(1,"qbuf: wrong memory type\n");
 728                 goto done;
 729         }
 730
 731         dprintk(1,"qbuf: requesting next field\n");
 732         field = videobuf_next_field(q);
 733         retval = q->ops->buf_prepare(q,buf,field);
 734         if (0 != retval) {
 735                 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
 736                 goto done;
 737         }
 738
 739         list_add_tail(&buf->stream,&q->stream);
 740         if (q->streaming) {
 741                 if (q->irqlock)
 742                         spin_lock_irqsave(q->irqlock,flags);
 743                 q->ops->buf_queue(q,buf);
 744                 if (q->irqlock)
 745                         spin_unlock_irqrestore(q->irqlock,flags);
 746         }
 747         dprintk(1,"qbuf: succeded\n");
 748         retval = 0;
 749
 750  done:
 751         mutex_unlock(&q->lock);
 752         return retval;
 753 }
 754
 755 int
 756 videobuf_dqbuf(struct videobuf_queue *q,
 757                struct v4l2_buffer *b, int nonblocking)
 758 {
 759         struct videobuf_buffer *buf;
 760         int retval;
 761
 762         mutex_lock(&q->lock);
 763         retval = -EBUSY;
 764         if (q->reading) {
 765                 dprintk(1,"dqbuf: Reading running...\n");
 766                 goto done;
 767         }
 768         retval = -EINVAL;
 769         if (b->type != q->type) {
 770                 dprintk(1,"dqbuf: Wrong type.\n");
 771                 goto done;
 772         }
 773         if (list_empty(&q->stream)) {
 774                 dprintk(1,"dqbuf: stream running\n");
 775                 goto done;
 776         }
 777         buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 778         retval = videobuf_waiton(buf, nonblocking, 1);
 779         if (retval < 0) {
 780                 dprintk(1,"dqbuf: waiton returned %d\n",retval);
 781                 goto done;
 782         }
 783         switch (buf->state) {
 784         case STATE_ERROR:
 785                 dprintk(1,"dqbuf: state is error\n");
 786                 retval = -EIO;
 787                 videobuf_dma_sync(q,&buf->dma);
 788                 buf->state = STATE_IDLE;
 789                 break;
 790         case STATE_DONE:
 791                 dprintk(1,"dqbuf: state is done\n");
 792                 videobuf_dma_sync(q,&buf->dma);
 793                 buf->state = STATE_IDLE;
 794                 break;
 795         default:
 796                 dprintk(1,"dqbuf: state invalid\n");
 797                 retval = -EINVAL;
 798                 goto done;
 799         }
 800         list_del(&buf->stream);
 801         memset(b,0,sizeof(*b));
 802         videobuf_status(b,buf,q->type);
 803
 804  done:
 805         mutex_unlock(&q->lock);
 806         return retval;
 807 }
 808
 809 int videobuf_streamon(struct videobuf_queue *q)
 810 {
 811         struct videobuf_buffer *buf;
 812         struct list_head *list;
 813         unsigned long flags=0;
 814         int retval;
 815
 816         mutex_lock(&q->lock);
 817         retval = -EBUSY;
 818         if (q->reading)
 819                 goto done;
 820         retval = 0;
 821         if (q->streaming)
 822                 goto done;
 823         q->streaming = 1;
 824         if (q->irqlock)
 825                 spin_lock_irqsave(q->irqlock,flags);
 826         list_for_each(list,&q->stream) {
 827                 buf = list_entry(list, struct videobuf_buffer, stream);
 828                 if (buf->state == STATE_PREPARED)
 829                         q->ops->buf_queue(q,buf);
 830         }
 831         if (q->irqlock)
 832                 spin_unlock_irqrestore(q->irqlock,flags);
 833
 834  done:
 835         mutex_unlock(&q->lock);
 836         return retval;
 837 }
 838
 839 int videobuf_streamoff(struct videobuf_queue *q)
 840 {
 841         int retval = -EINVAL;
 842
 843         mutex_lock(&q->lock);
 844         if (!q->streaming)
 845                 goto done;
 846         videobuf_queue_cancel(q);
 847         q->streaming = 0;
 848         retval = 0;
 849
 850  done:
 851         mutex_unlock(&q->lock);
 852         return retval;
 853 }
 854
 855 static ssize_t
 856 videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
 857                        size_t count, loff_t *ppos)
 858 {
 859         enum v4l2_field field;
 860         unsigned long flags=0;
 861         int retval;
 862
 863         /* setup stuff */
 864         q->read_buf = videobuf_alloc(q->msize);
 865         if (NULL == q->read_buf)
 866                 return -ENOMEM;
 867
 868         q->read_buf->memory = V4L2_MEMORY_USERPTR;
 869         q->read_buf->baddr  = (unsigned long)data;
 870         q->read_buf->bsize  = count;
 871         field = videobuf_next_field(q);
 872         retval = q->ops->buf_prepare(q,q->read_buf,field);
 873         if (0 != retval)
 874                 goto done;
 875
 876         /* start capture & wait */
 877         if (q->irqlock)
 878                 spin_lock_irqsave(q->irqlock,flags);
 879         q->ops->buf_queue(q,q->read_buf);
 880         if (q->irqlock)
 881                 spin_unlock_irqrestore(q->irqlock,flags);
 882         retval = videobuf_waiton(q->read_buf,0,0);
 883         if (0 == retval) {
 884                 videobuf_dma_sync(q,&q->read_buf->dma);
 885                 if (STATE_ERROR == q->read_buf->state)
 886                         retval = -EIO;
 887                 else
 888                         retval = q->read_buf->size;
 889         }
 890
 891  done:
 892         /* cleanup */
 893         q->ops->buf_release(q,q->read_buf);
 894         kfree(q->read_buf);
 895         q->read_buf = NULL;
 896         return retval;
 897 }
 898
 899 ssize_t videobuf_read_one(struct videobuf_queue *q,
 900                           char __user *data, size_t count, loff_t *ppos,
 901                           int nonblocking)
 902 {
 903         enum v4l2_field field;
 904         unsigned long flags=0;
 905         unsigned size, nbufs, bytes;
 906         int retval;
 907
 908         mutex_lock(&q->lock);
 909
 910         nbufs = 1; size = 0;
 911         q->ops->buf_setup(q,&nbufs,&size);
 912         if (NULL == q->read_buf  &&
 913             count >= size        &&
 914             !nonblocking) {
 915                 retval = videobuf_read_zerocopy(q,data,count,ppos);
 916                 if (retval >= 0  ||  retval == -EIO)
 917                         /* ok, all done */
 918                         goto done;
 919                 /* fallback to kernel bounce buffer on failures */
 920         }
 921
 922         if (NULL == q->read_buf) {
 923                 /* need to capture a new frame */
 924                 retval = -ENOMEM;
 925                 q->read_buf = videobuf_alloc(q->msize);
 926                 dprintk(1,"video alloc=0x%08x\n",(unsigned int) q->read_buf);
 927                 if (NULL == q->read_buf)
 928                         goto done;
 929                 q->read_buf->memory = V4L2_MEMORY_USERPTR;
 930                 q->read_buf->bsize = count; /* preferred size */
 931                 field = videobuf_next_field(q);
 932                 retval = q->ops->buf_prepare(q,q->read_buf,field);
 933                 if (0 != retval) {
 934                         kfree (q->read_buf);
 935                         q->read_buf = NULL;
 936                         goto done;
 937                 }
 938                 if (q->irqlock)
 939                         spin_lock_irqsave(q->irqlock,flags);
 940                 q->ops->buf_queue(q,q->read_buf);
 941                 if (q->irqlock)
 942                         spin_unlock_irqrestore(q->irqlock,flags);
 943                 q->read_off = 0;
 944         }
 945
 946         /* wait until capture is done */
 947         retval = videobuf_waiton(q->read_buf, nonblocking, 1);
 948         if (0 != retval)
 949                 goto done;
 950         videobuf_dma_sync(q,&q->read_buf->dma);
 951
 952         if (STATE_ERROR == q->read_buf->state) {
 953                 /* catch I/O errors */
 954                 q->ops->buf_release(q,q->read_buf);
 955                 kfree(q->read_buf);
 956                 q->read_buf = NULL;
 957                 retval = -EIO;
 958                 goto done;
 959         }
 960
 961         /* copy to userspace */
 962         bytes = count;
 963         if (bytes > q->read_buf->size - q->read_off)
 964                 bytes = q->read_buf->size - q->read_off;
 965         retval = -EFAULT;
 966         if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
 967                 goto done;
 968
 969         retval = bytes;
 970         q->read_off += bytes;
 971         if (q->read_off == q->read_buf->size) {
 972                 /* all data copied, cleanup */
 973                 q->ops->buf_release(q,q->read_buf);
 974                 kfree(q->read_buf);
 975                 q->read_buf = NULL;
 976         }
 977
 978  done:
 979         mutex_unlock(&q->lock);
 980         return retval;
 981 }
 982
 983 int videobuf_read_start(struct videobuf_queue *q)
 984 {
 985         enum v4l2_field field;
 986         unsigned long flags=0;
 987         int count = 0, size = 0;
 988         int err, i;
 989
 990         q->ops->buf_setup(q,&count,&size);
 991         if (count < 2)
 992                 count = 2;
 993         if (count > VIDEO_MAX_FRAME)
 994                 count = VIDEO_MAX_FRAME;
 995         size = PAGE_ALIGN(size);
 996
 997         err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
 998         if (err)
 999                 return err;
1000         for (i = 0; i < count; i++) {
1001                 field = videobuf_next_field(q);
1002                 err = q->ops->buf_prepare(q,q->bufs[i],field);
1003                 if (err)
1004                         return err;
1005                 list_add_tail(&q->bufs[i]->stream, &q->stream);
1006         }
1007         if (q->irqlock)
1008                 spin_lock_irqsave(q->irqlock,flags);
1009         for (i = 0; i < count; i++)
1010                 q->ops->buf_queue(q,q->bufs[i]);
1011         if (q->irqlock)
1012                 spin_unlock_irqrestore(q->irqlock,flags);
1013         q->reading = 1;
1014         return 0;
1015 }
1016
1017 void videobuf_read_stop(struct videobuf_queue *q)
1018 {
1019         int i;
1020
1021         videobuf_queue_cancel(q);
1022         videobuf_mmap_free(q);
1023         INIT_LIST_HEAD(&q->stream);
1024         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1025                 if (NULL == q->bufs[i])
1026                         continue;
1027                 kfree(q->bufs[i]);
1028                 q->bufs[i] = NULL;
1029         }
1030         q->read_buf = NULL;
1031         q->reading  = 0;
1032 }
1033
1034 ssize_t videobuf_read_stream(struct videobuf_queue *q,
1035                              char __user *data, size_t count, loff_t *ppos,
1036                              int vbihack, int nonblocking)
1037 {
1038         unsigned int *fc, bytes;
1039         int err, retval;
1040         unsigned long flags=0;
1041
1042         dprintk(2,"%s\n",__FUNCTION__);
1043         mutex_lock(&q->lock);
1044         retval = -EBUSY;
1045         if (q->streaming)
1046                 goto done;
1047         if (!q->reading) {
1048                 retval = videobuf_read_start(q);
1049                 if (retval < 0)
1050                         goto done;
1051         }
1052
1053         retval = 0;
1054         while (count > 0) {
1055                 /* get / wait for data */
1056                 if (NULL == q->read_buf) {
1057                         q->read_buf = list_entry(q->stream.next,
1058                                                  struct videobuf_buffer,
1059                                                  stream);
1060                         list_del(&q->read_buf->stream);
1061                         q->read_off = 0;
1062                 }
1063                 err = videobuf_waiton(q->read_buf, nonblocking, 1);
1064                 if (err < 0) {
1065                         if (0 == retval)
1066                                 retval = err;
1067                         break;
1068                 }
1069
1070                 if (q->read_buf->state == STATE_DONE) {
1071                         if (vbihack) {
1072                                 /* dirty, undocumented hack -- pass the frame counter
1073                                  * within the last four bytes of each vbi data block.
1074                                  * We need that one to maintain backward compatibility
1075                                  * to all vbi decoding software out there ... */
1076                                 fc  = (unsigned int*)q->read_buf->dma.vmalloc;
1077                                 fc += (q->read_buf->size>>2) -1;
1078                                 *fc = q->read_buf->field_count >> 1;
1079                                 dprintk(1,"vbihack: %d\n",*fc);
1080                         }
1081
1082                         /* copy stuff */
1083                         bytes = count;
1084                         if (bytes > q->read_buf->size - q->read_off)
1085                                 bytes = q->read_buf->size - q->read_off;
1086                         if (copy_to_user(data + retval,
1087                                          q->read_buf->dma.vmalloc + q->read_off,
1088                                          bytes)) {
1089                                 if (0 == retval)
1090                                         retval = -EFAULT;
1091                                 break;
1092                         }
1093                         count       -= bytes;
1094                         retval      += bytes;
1095                         q->read_off += bytes;
1096                 } else {
1097                         /* some error */
1098                         q->read_off = q->read_buf->size;
1099                         if (0 == retval)
1100                                 retval = -EIO;
1101                 }
1102
1103                 /* requeue buffer when done with copying */
1104                 if (q->read_off == q->read_buf->size) {
1105                         list_add_tail(&q->read_buf->stream,
1106                                       &q->stream);
1107                         if (q->irqlock)
1108                                 spin_lock_irqsave(q->irqlock,flags);
1109                         q->ops->buf_queue(q,q->read_buf);
1110                         if (q->irqlock)
1111                                 spin_unlock_irqrestore(q->irqlock,flags);
1112                         q->read_buf = NULL;
1113                 }
1114                 if (retval < 0)
1115                         break;
1116         }
1117
1118  done:
1119         mutex_unlock(&q->lock);
1120         return retval;
1121 }
1122
1123 unsigned int videobuf_poll_stream(struct file *file,
1124                                   struct videobuf_queue *q,
1125                                   poll_table *wait)
1126 {
1127         struct videobuf_buffer *buf = NULL;
1128         unsigned int rc = 0;
1129
1130         mutex_lock(&q->lock);
1131         if (q->streaming) {
1132                 if (!list_empty(&q->stream))
1133                         buf = list_entry(q->stream.next,
1134                                          struct videobuf_buffer, stream);
1135         } else {
1136                 if (!q->reading)
1137                         videobuf_read_start(q);
1138                 if (!q->reading) {
1139                         rc = POLLERR;
1140                 } else if (NULL == q->read_buf) {
1141                         q->read_buf = list_entry(q->stream.next,
1142                                                  struct videobuf_buffer,
1143                                                  stream);
1144                         list_del(&q->read_buf->stream);
1145                         q->read_off = 0;
1146                 }
1147                 buf = q->read_buf;
1148         }
1149         if (!buf)
1150                 rc = POLLERR;
1151
1152         if (0 == rc) {
1153                 poll_wait(file, &buf->done, wait);
1154                 if (buf->state == STATE_DONE ||
1155                     buf->state == STATE_ERROR)
1156                         rc = POLLIN|POLLRDNORM;
1157         }
1158         mutex_unlock(&q->lock);
1159         return rc;
1160 }
1161
1162 /* --------------------------------------------------------------------- */
1163
1164 static void
1165 videobuf_vm_open(struct vm_area_struct *vma)
1166 {
1167         struct videobuf_mapping *map = vma->vm_private_data;
1168
1169         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1170                 map->count,vma->vm_start,vma->vm_end);
1171         map->count++;
1172 }
1173
1174 static void
1175 videobuf_vm_close(struct vm_area_struct *vma)
1176 {
1177         struct videobuf_mapping *map = vma->vm_private_data;
1178         struct videobuf_queue *q = map->q;
1179         int i;
1180
1181         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1182                 map->count,vma->vm_start,vma->vm_end);
1183
1184         map->count--;
1185         if (0 == map->count) {
1186                 dprintk(1,"munmap %p q=%p\n",map,q);
1187                 mutex_lock(&q->lock);
1188                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1189                         if (NULL == q->bufs[i])
1190                                 continue;
1191                         if (q->bufs[i])
1192                                 ;
1193                         if (q->bufs[i]->map != map)
1194                                 continue;
1195                         q->bufs[i]->map   = NULL;
1196                         q->bufs[i]->baddr = 0;
1197                         q->ops->buf_release(q,q->bufs[i]);
1198                 }
1199                 mutex_unlock(&q->lock);
1200                 kfree(map);
1201         }
1202         return;
1203 }
1204
1205 /*
1206  * Get a anonymous page for the mapping.  Make sure we can DMA to that
1207  * memory location with 32bit PCI devices (i.e. don't use highmem for
1208  * now ...).  Bounce buffers don't work very well for the data rates
1209  * video capture has.
1210  */
1211 static struct page*
1212 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1213                    int *type)
1214 {
1215         struct page *page;
1216
1217         dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1218                 vaddr,vma->vm_start,vma->vm_end);
1219         if (vaddr > vma->vm_end)
1220                 return NOPAGE_SIGBUS;
1221         page = alloc_page(GFP_USER);
1222         if (!page)
1223                 return NOPAGE_OOM;
1224         clear_user_page(page_address(page), vaddr, page);
1225         if (type)
1226                 *type = VM_FAULT_MINOR;
1227         return page;
1228 }
1229
1230 static struct vm_operations_struct videobuf_vm_ops =
1231 {
1232         .open     = videobuf_vm_open,
1233         .close    = videobuf_vm_close,
1234         .nopage   = videobuf_vm_nopage,
1235 };
1236
1237 int videobuf_mmap_setup(struct videobuf_queue *q,
1238                         unsigned int bcount, unsigned int bsize,
1239                         enum v4l2_memory memory)
1240 {
1241         unsigned int i;
1242         int err;
1243
1244         err = videobuf_mmap_free(q);
1245         if (0 != err)
1246                 return err;
1247
1248         for (i = 0; i < bcount; i++) {
1249                 q->bufs[i] = videobuf_alloc(q->msize);
1250                 q->bufs[i]->i      = i;
1251                 q->bufs[i]->input  = UNSET;
1252                 q->bufs[i]->memory = memory;
1253                 q->bufs[i]->bsize  = bsize;
1254                 switch (memory) {
1255                 case V4L2_MEMORY_MMAP:
1256                         q->bufs[i]->boff  = bsize * i;
1257                         break;
1258                 case V4L2_MEMORY_USERPTR:
1259                 case V4L2_MEMORY_OVERLAY:
1260                         /* nothing */
1261                         break;
1262                 }
1263         }
1264         dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1265                 bcount,bsize);
1266         return 0;
1267 }
1268
1269 int videobuf_mmap_free(struct videobuf_queue *q)
1270 {
1271         int i;
1272
1273         for (i = 0; i < VIDEO_MAX_FRAME; i++)
1274                 if (q->bufs[i] && q->bufs[i]->map)
1275                         return -EBUSY;
1276         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1277                 if (NULL == q->bufs[i])
1278                         continue;
1279                 q->ops->buf_release(q,q->bufs[i]);
1280                 kfree(q->bufs[i]);
1281                 q->bufs[i] = NULL;
1282         }
1283         return 0;
1284 }
1285
1286 int videobuf_mmap_mapper(struct videobuf_queue *q,
1287                          struct vm_area_struct *vma)
1288 {
1289         struct videobuf_mapping *map;
1290         unsigned int first,last,size,i;
1291         int retval;
1292
1293         mutex_lock(&q->lock);
1294         retval = -EINVAL;
1295         if (!(vma->vm_flags & VM_WRITE)) {
1296                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1297                 goto done;
1298         }
1299         if (!(vma->vm_flags & VM_SHARED)) {
1300                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1301                 goto done;
1302         }
1303
1304         /* look for first buffer to map */
1305         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1306                 if (NULL == q->bufs[first])
1307                         continue;
1308                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1309                         continue;
1310                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1311                         break;
1312         }
1313         if (VIDEO_MAX_FRAME == first) {
1314                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1315                         (vma->vm_pgoff << PAGE_SHIFT));
1316                 goto done;
1317         }
1318
1319         /* look for last buffer to map */
1320         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1321                 if (NULL == q->bufs[last])
1322                         continue;
1323                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1324                         continue;
1325                 if (q->bufs[last]->map) {
1326                         retval = -EBUSY;
1327                         goto done;
1328                 }
1329                 size += q->bufs[last]->bsize;
1330                 if (size == (vma->vm_end - vma->vm_start))
1331                         break;
1332         }
1333         if (VIDEO_MAX_FRAME == last) {
1334                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1335                         (vma->vm_end - vma->vm_start));
1336                 goto done;
1337         }
1338
1339         /* create mapping + update buffer list */
1340         retval = -ENOMEM;
1341         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1342         if (NULL == map)
1343                 goto done;
1344         for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1345                 q->bufs[i]->map   = map;
1346                 q->bufs[i]->baddr = vma->vm_start + size;
1347         }
1348         map->count    = 1;
1349         map->start    = vma->vm_start;
1350         map->end      = vma->vm_end;
1351         map->q        = q;
1352         vma->vm_ops   = &videobuf_vm_ops;
1353         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1354         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1355         vma->vm_private_data = map;
1356         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1357                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1358         retval = 0;
1359
1360  done:
1361         mutex_unlock(&q->lock);
1362         return retval;
1363 }
1364
1365 /* --------------------------------------------------------------------- */
1366
1367 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1368
1369 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1370 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1371 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1372 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1373 EXPORT_SYMBOL_GPL(videobuf_dma_map);
1374 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
1375 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
1376 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1377
1378 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
1379 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
1380
1381 EXPORT_SYMBOL_GPL(videobuf_alloc);
1382 EXPORT_SYMBOL_GPL(videobuf_waiton);
1383 EXPORT_SYMBOL_GPL(videobuf_iolock);
1384
1385 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1386 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1387 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1388
1389 EXPORT_SYMBOL_GPL(videobuf_next_field);
1390 EXPORT_SYMBOL_GPL(videobuf_status);
1391 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1392 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1393 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1394 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1395 EXPORT_SYMBOL_GPL(videobuf_streamon);
1396 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1397
1398 EXPORT_SYMBOL_GPL(videobuf_read_start);
1399 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1400 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1401 EXPORT_SYMBOL_GPL(videobuf_read_one);
1402 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1403
1404 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1405 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1406 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1407
1408 /*
1409  * Local variables:
1410  * c-basic-offset: 8
1411  * End:
1412  */