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         dma->varea = (void *) data;
 152
 153         down_read(&current->mm->mmap_sem);
 154         err = get_user_pages(current,current->mm,
 155                              data & PAGE_MASK, dma->nr_pages,
 156                              rw == READ, 1, /* force */
 157                              dma->pages, NULL);
 158         up_read(&current->mm->mmap_sem);
 159         if (err != dma->nr_pages) {
 160                 dma->nr_pages = (err >= 0) ? err : 0;
 161                 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
 162                 return err < 0 ? err : -EINVAL;
 163         }
 164         return 0;
 165 }
 166
 167 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
 168                              int nr_pages)
 169 {
 170         dprintk(1,"init kernel [%d pages]\n",nr_pages);
 171         dma->direction = direction;
 172         dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
 173         if (NULL == dma->vmalloc) {
 174                 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
 175                 return -ENOMEM;
 176         }
 177         dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
 178                                 (unsigned long)dma->vmalloc,
 179                                 nr_pages << PAGE_SHIFT);
 180         memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
 181         dma->nr_pages = nr_pages;
 182         return 0;
 183 }
 184
 185 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
 186                               dma_addr_t addr, int nr_pages)
 187 {
 188         dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
 189                 nr_pages,(unsigned long)addr);
 190         dma->direction = direction;
 191         if (0 == addr)
 192                 return -EINVAL;
 193
 194         dma->bus_addr = addr;
 195         dma->nr_pages = nr_pages;
 196         return 0;
 197 }
 198
 199 int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 200 {
 201         void                   *dev=q->dev;
 202
 203         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 204         BUG_ON(0 == dma->nr_pages);
 205
 206         if (dma->pages) {
 207                 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
 208                                                    dma->offset);
 209         }
 210         if (dma->vmalloc) {
 211                 dma->sglist = videobuf_vmalloc_to_sg
 212                                                 (dma->vmalloc,dma->nr_pages);
 213         }
 214         if (dma->bus_addr) {
 215                 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
 216                 if (NULL != dma->sglist) {
 217                         dma->sglen  = 1;
 218                         sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
 219                         dma->sglist[0].offset           = dma->bus_addr & ~PAGE_MASK;
 220                         sg_dma_len(&dma->sglist[0])     = dma->nr_pages * PAGE_SIZE;
 221                 }
 222         }
 223         if (NULL == dma->sglist) {
 224                 dprintk(1,"scatterlist is NULL\n");
 225                 return -ENOMEM;
 226         }
 227         if (!dma->bus_addr) {
 228                 if (q->ops->vb_map_sg) {
 229                         dma->sglen = q->ops->vb_map_sg(dev,dma->sglist,
 230                                         dma->nr_pages, dma->direction);
 231                 }
 232                 if (0 == dma->sglen) {
 233                         printk(KERN_WARNING
 234                                "%s: videobuf_map_sg failed\n",__FUNCTION__);
 235                         kfree(dma->sglist);
 236                         dma->sglist = NULL;
 237                         dma->sglen = 0;
 238                         return -EIO;
 239                 }
 240         }
 241         return 0;
 242 }
 243
 244 int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 245 {
 246         void                   *dev=q->dev;
 247
 248         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 249         BUG_ON(!dma->sglen);
 250
 251         if (!dma->bus_addr && q->ops->vb_dma_sync_sg)
 252                 q->ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
 253                                                         dma->direction);
 254
 255         return 0;
 256 }
 257
 258 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 259 {
 260         void                   *dev=q->dev;
 261
 262         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 263         if (!dma->sglen)
 264                 return 0;
 265
 266         if (!dma->bus_addr && q->ops->vb_unmap_sg)
 267                         q->ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
 268                                                         dma->direction);
 269         kfree(dma->sglist);
 270         dma->sglist = NULL;
 271         dma->sglen = 0;
 272         return 0;
 273 }
 274
 275 int videobuf_dma_free(struct videobuf_dmabuf *dma)
 276 {
 277         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 278         BUG_ON(dma->sglen);
 279
 280         if (dma->pages) {
 281                 int i;
 282                 for (i=0; i < dma->nr_pages; i++)
 283                         page_cache_release(dma->pages[i]);
 284                 kfree(dma->pages);
 285                 dma->pages = NULL;
 286         }
 287
 288         vfree(dma->vmalloc);
 289         dma->vmalloc = NULL;
 290         dma->varea = NULL;
 291
 292         if (dma->bus_addr) {
 293                 dma->bus_addr = 0;
 294         }
 295         dma->direction = PCI_DMA_NONE;
 296         return 0;
 297 }
 298
 299 /* --------------------------------------------------------------------- */
 300
 301 void* videobuf_alloc(unsigned int size)
 302 {
 303         struct videobuf_buffer *vb;
 304
 305         vb = kzalloc(size,GFP_KERNEL);
 306         if (NULL != vb) {
 307                 videobuf_dma_init(&vb->dma);
 308                 init_waitqueue_head(&vb->done);
 309                 vb->magic     = MAGIC_BUFFER;
 310         }
 311         return vb;
 312 }
 313
 314 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
 315 {
 316         int retval = 0;
 317         DECLARE_WAITQUEUE(wait, current);
 318
 319         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
 320         add_wait_queue(&vb->done, &wait);
 321         while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
 322                 if (non_blocking) {
 323                         retval = -EAGAIN;
 324                         break;
 325                 }
 326                 set_current_state(intr  ? TASK_INTERRUPTIBLE
 327                                         : TASK_UNINTERRUPTIBLE);
 328                 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
 329                         schedule();
 330                 set_current_state(TASK_RUNNING);
 331                 if (intr && signal_pending(current)) {
 332                         dprintk(1,"buffer waiton: -EINTR\n");
 333                         retval = -EINTR;
 334                         break;
 335                 }
 336         }
 337         remove_wait_queue(&vb->done, &wait);
 338         return retval;
 339 }
 340
 341 int
 342 videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
 343                 struct v4l2_framebuffer *fbuf)
 344 {
 345         int err,pages;
 346         dma_addr_t bus;
 347
 348         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
 349         switch (vb->memory) {
 350         case V4L2_MEMORY_MMAP:
 351         case V4L2_MEMORY_USERPTR:
 352                 if (0 == vb->baddr) {
 353                         /* no userspace addr -- kernel bounce buffer */
 354                         pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
 355                         err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
 356                                                        pages);
 357                         if (0 != err)
 358                                 return err;
 359                 } else {
 360                         /* dma directly to userspace */
 361                         err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
 362                                                      vb->baddr,vb->bsize);
 363                         if (0 != err)
 364                                 return err;
 365                 }
 366                 break;
 367         case V4L2_MEMORY_OVERLAY:
 368                 if (NULL == fbuf)
 369                         return -EINVAL;
 370                 /* FIXME: need sanity checks for vb->boff */
 371                 /*
 372                  * Using a double cast to avoid compiler warnings when
 373                  * building for PAE. Compiler doesn't like direct casting
 374                  * of a 32 bit ptr to 64 bit integer.
 375                  */
 376                 bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
 377                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
 378                 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
 379                                                 bus, pages);
 380                 if (0 != err)
 381                         return err;
 382                 break;
 383         default:
 384                 BUG();
 385         }
 386         err = videobuf_dma_map(q,&vb->dma);
 387         if (0 != err)
 388                 return err;
 389
 390         return 0;
 391 }
 392
 393 /* --------------------------------------------------------------------- */
 394
 395 void videobuf_queue_pci(struct videobuf_queue* q)
 396 {
 397         /* If not specified, defaults to PCI map sg */
 398         if (!q->ops->vb_map_sg)
 399                 q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 400
 401         if (!q->ops->vb_dma_sync_sg)
 402                 q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
 403         if (!q->ops->vb_unmap_sg)
 404                 q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 405 }
 406
 407 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
 408 {
 409         struct videobuf_queue q;
 410         struct videobuf_queue_ops qops;
 411
 412         q.dev=pci;
 413         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 414         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 415         q.ops = &qops;
 416
 417         return (videobuf_dma_map(&q,dma));
 418 }
 419
 420 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
 421 {
 422         struct videobuf_queue q;
 423         struct videobuf_queue_ops qops;
 424
 425         q.dev=pci;
 426         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 427         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 428         q.ops = &qops;
 429
 430         return (videobuf_dma_unmap(&q,dma));
 431 }
 432
 433 void videobuf_queue_init(struct videobuf_queue* q,
 434                          struct videobuf_queue_ops *ops,
 435                          void *dev,
 436                          spinlock_t *irqlock,
 437                          enum v4l2_buf_type type,
 438                          enum v4l2_field field,
 439                          unsigned int msize,
 440                          void *priv)
 441 {
 442         memset(q,0,sizeof(*q));
 443         q->irqlock = irqlock;
 444         q->dev     = dev;
 445         q->type    = type;
 446         q->field   = field;
 447         q->msize   = msize;
 448         q->ops     = ops;
 449         q->priv_data = priv;
 450
 451         videobuf_queue_pci(q);
 452
 453         mutex_init(&q->lock);
 454         INIT_LIST_HEAD(&q->stream);
 455 }
 456
 457 int
 458 videobuf_queue_is_busy(struct videobuf_queue *q)
 459 {
 460         int i;
 461
 462         if (q->streaming) {
 463                 dprintk(1,"busy: streaming active\n");
 464                 return 1;
 465         }
 466         if (q->reading) {
 467                 dprintk(1,"busy: pending read #1\n");
 468                 return 1;
 469         }
 470         if (q->read_buf) {
 471                 dprintk(1,"busy: pending read #2\n");
 472                 return 1;
 473         }
 474         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 475                 if (NULL == q->bufs[i])
 476                         continue;
 477                 if (q->bufs[i]->map) {
 478                         dprintk(1,"busy: buffer #%d mapped\n",i);
 479                         return 1;
 480                 }
 481                 if (q->bufs[i]->state == STATE_QUEUED) {
 482                         dprintk(1,"busy: buffer #%d queued\n",i);
 483                         return 1;
 484                 }
 485                 if (q->bufs[i]->state == STATE_ACTIVE) {
 486                         dprintk(1,"busy: buffer #%d avtive\n",i);
 487                         return 1;
 488                 }
 489         }
 490         return 0;
 491 }
 492
 493 void
 494 videobuf_queue_cancel(struct videobuf_queue *q)
 495 {
 496         unsigned long flags=0;
 497         int i;
 498
 499         /* remove queued buffers from list */
 500         if (q->irqlock)
 501                 spin_lock_irqsave(q->irqlock,flags);
 502         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 503                 if (NULL == q->bufs[i])
 504                         continue;
 505                 if (q->bufs[i]->state == STATE_QUEUED) {
 506                         list_del(&q->bufs[i]->queue);
 507                         q->bufs[i]->state = STATE_ERROR;
 508                 }
 509         }
 510         if (q->irqlock)
 511                 spin_unlock_irqrestore(q->irqlock,flags);
 512
 513         /* free all buffers + clear queue */
 514         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 515                 if (NULL == q->bufs[i])
 516                         continue;
 517                 q->ops->buf_release(q,q->bufs[i]);
 518         }
 519         INIT_LIST_HEAD(&q->stream);
 520 }
 521
 522 /* --------------------------------------------------------------------- */
 523
 524 enum v4l2_field
 525 videobuf_next_field(struct videobuf_queue *q)
 526 {
 527         enum v4l2_field field = q->field;
 528
 529         BUG_ON(V4L2_FIELD_ANY == field);
 530
 531         if (V4L2_FIELD_ALTERNATE == field) {
 532                 if (V4L2_FIELD_TOP == q->last) {
 533                         field   = V4L2_FIELD_BOTTOM;
 534                         q->last = V4L2_FIELD_BOTTOM;
 535                 } else {
 536                         field   = V4L2_FIELD_TOP;
 537                         q->last = V4L2_FIELD_TOP;
 538                 }
 539         }
 540         return field;
 541 }
 542
 543 void
 544 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
 545                 enum v4l2_buf_type type)
 546 {
 547         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
 548
 549         b->index    = vb->i;
 550         b->type     = type;
 551
 552         b->memory   = vb->memory;
 553         switch (b->memory) {
 554         case V4L2_MEMORY_MMAP:
 555                 b->m.offset  = vb->boff;
 556                 b->length    = vb->bsize;
 557                 break;
 558         case V4L2_MEMORY_USERPTR:
 559                 b->m.userptr = vb->baddr;
 560                 b->length    = vb->bsize;
 561                 break;
 562         case V4L2_MEMORY_OVERLAY:
 563                 b->m.offset  = vb->boff;
 564                 break;
 565         }
 566
 567         b->flags    = 0;
 568         if (vb->map)
 569                 b->flags |= V4L2_BUF_FLAG_MAPPED;
 570
 571         switch (vb->state) {
 572         case STATE_PREPARED:
 573         case STATE_QUEUED:
 574         case STATE_ACTIVE:
 575                 b->flags |= V4L2_BUF_FLAG_QUEUED;
 576                 break;
 577         case STATE_DONE:
 578         case STATE_ERROR:
 579                 b->flags |= V4L2_BUF_FLAG_DONE;
 580                 break;
 581         case STATE_NEEDS_INIT:
 582         case STATE_IDLE:
 583                 /* nothing */
 584                 break;
 585         }
 586
 587         if (vb->input != UNSET) {
 588                 b->flags |= V4L2_BUF_FLAG_INPUT;
 589                 b->input  = vb->input;
 590         }
 591
 592         b->field     = vb->field;
 593         b->timestamp = vb->ts;
 594         b->bytesused = vb->size;
 595         b->sequence  = vb->field_count >> 1;
 596 }
 597
 598 int
 599 videobuf_reqbufs(struct videobuf_queue *q,
 600                  struct v4l2_requestbuffers *req)
 601 {
 602         unsigned int size,count;
 603         int retval;
 604
 605         if (req->type != q->type) {
 606                 dprintk(1,"reqbufs: queue type invalid\n");
 607                 return -EINVAL;
 608         }
 609         if (req->count < 1) {
 610                 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
 611                 return -EINVAL;
 612         }
 613         if (req->memory != V4L2_MEMORY_MMAP     &&
 614             req->memory != V4L2_MEMORY_USERPTR  &&
 615             req->memory != V4L2_MEMORY_OVERLAY) {
 616                 dprintk(1,"reqbufs: memory type invalid\n");
 617                 return -EINVAL;
 618         }
 619
 620         if (q->streaming) {
 621                 dprintk(1,"reqbufs: streaming already exists\n");
 622                 return -EBUSY;
 623         }
 624         if (!list_empty(&q->stream)) {
 625                 dprintk(1,"reqbufs: stream running\n");
 626                 return -EBUSY;
 627         }
 628
 629         mutex_lock(&q->lock);
 630         count = req->count;
 631         if (count > VIDEO_MAX_FRAME)
 632                 count = VIDEO_MAX_FRAME;
 633         size = 0;
 634         q->ops->buf_setup(q,&count,&size);
 635         size = PAGE_ALIGN(size);
 636         dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
 637                 count, size, (count*size)>>PAGE_SHIFT);
 638
 639         retval = videobuf_mmap_setup(q,count,size,req->memory);
 640         if (retval < 0) {
 641                 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
 642                 goto done;
 643         }
 644
 645         req->count = count;
 646
 647  done:
 648         mutex_unlock(&q->lock);
 649         return retval;
 650 }
 651
 652 int
 653 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
 654 {
 655         if (unlikely(b->type != q->type)) {
 656                 dprintk(1,"querybuf: Wrong type.\n");
 657                 return -EINVAL;
 658         }
 659         if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
 660                 dprintk(1,"querybuf: index out of range.\n");
 661                 return -EINVAL;
 662         }
 663         if (unlikely(NULL == q->bufs[b->index])) {
 664                 dprintk(1,"querybuf: buffer is null.\n");
 665                 return -EINVAL;
 666         }
 667         videobuf_status(b,q->bufs[b->index],q->type);
 668         return 0;
 669 }
 670
 671 int
 672 videobuf_qbuf(struct videobuf_queue *q,
 673               struct v4l2_buffer *b)
 674 {
 675         struct videobuf_buffer *buf;
 676         enum v4l2_field field;
 677         unsigned long flags=0;
 678         int retval;
 679
 680         mutex_lock(&q->lock);
 681         retval = -EBUSY;
 682         if (q->reading) {
 683                 dprintk(1,"qbuf: Reading running...\n");
 684                 goto done;
 685         }
 686         retval = -EINVAL;
 687         if (b->type != q->type) {
 688                 dprintk(1,"qbuf: Wrong type.\n");
 689                 goto done;
 690         }
 691         if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
 692                 dprintk(1,"qbuf: index out of range.\n");
 693                 goto done;
 694         }
 695         buf = q->bufs[b->index];
 696         if (NULL == buf) {
 697                 dprintk(1,"qbuf: buffer is null.\n");
 698                 goto done;
 699         }
 700         MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
 701         if (buf->memory != b->memory) {
 702                 dprintk(1,"qbuf: memory type is wrong.\n");
 703                 goto done;
 704         }
 705         if (buf->state == STATE_QUEUED ||
 706             buf->state == STATE_PREPARED ||
 707             buf->state == STATE_ACTIVE) {
 708                 dprintk(1,"qbuf: buffer is already queued or active.\n");
 709                 goto done;
 710         }
 711
 712         if (b->flags & V4L2_BUF_FLAG_INPUT) {
 713                 if (b->input >= q->inputs) {
 714                         dprintk(1,"qbuf: wrong input.\n");
 715                         goto done;
 716                 }
 717                 buf->input = b->input;
 718         } else {
 719                 buf->input = UNSET;
 720         }
 721
 722         switch (b->memory) {
 723         case V4L2_MEMORY_MMAP:
 724                 if (0 == buf->baddr) {
 725                         dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
 726                         goto done;
 727                 }
 728                 break;
 729         case V4L2_MEMORY_USERPTR:
 730                 if (b->length < buf->bsize) {
 731                         dprintk(1,"qbuf: buffer length is not enough\n");
 732                         goto done;
 733                 }
 734                 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
 735                         q->ops->buf_release(q,buf);
 736                 buf->baddr = b->m.userptr;
 737                 break;
 738         case V4L2_MEMORY_OVERLAY:
 739                 buf->boff = b->m.offset;
 740                 break;
 741         default:
 742                 dprintk(1,"qbuf: wrong memory type\n");
 743                 goto done;
 744         }
 745
 746         dprintk(1,"qbuf: requesting next field\n");
 747         field = videobuf_next_field(q);
 748         retval = q->ops->buf_prepare(q,buf,field);
 749         if (0 != retval) {
 750                 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
 751                 goto done;
 752         }
 753
 754         list_add_tail(&buf->stream,&q->stream);
 755         if (q->streaming) {
 756                 if (q->irqlock)
 757                         spin_lock_irqsave(q->irqlock,flags);
 758                 q->ops->buf_queue(q,buf);
 759                 if (q->irqlock)
 760                         spin_unlock_irqrestore(q->irqlock,flags);
 761         }
 762         dprintk(1,"qbuf: succeded\n");
 763         retval = 0;
 764
 765  done:
 766         mutex_unlock(&q->lock);
 767         return retval;
 768 }
 769
 770 int
 771 videobuf_dqbuf(struct videobuf_queue *q,
 772                struct v4l2_buffer *b, int nonblocking)
 773 {
 774         struct videobuf_buffer *buf;
 775         int retval;
 776
 777         mutex_lock(&q->lock);
 778         retval = -EBUSY;
 779         if (q->reading) {
 780                 dprintk(1,"dqbuf: Reading running...\n");
 781                 goto done;
 782         }
 783         retval = -EINVAL;
 784         if (b->type != q->type) {
 785                 dprintk(1,"dqbuf: Wrong type.\n");
 786                 goto done;
 787         }
 788         if (list_empty(&q->stream)) {
 789                 dprintk(1,"dqbuf: stream running\n");
 790                 goto done;
 791         }
 792         buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 793         retval = videobuf_waiton(buf, nonblocking, 1);
 794         if (retval < 0) {
 795                 dprintk(1,"dqbuf: waiton returned %d\n",retval);
 796                 goto done;
 797         }
 798         switch (buf->state) {
 799         case STATE_ERROR:
 800                 dprintk(1,"dqbuf: state is error\n");
 801                 retval = -EIO;
 802                 videobuf_dma_sync(q,&buf->dma);
 803                 buf->state = STATE_IDLE;
 804                 break;
 805         case STATE_DONE:
 806                 dprintk(1,"dqbuf: state is done\n");
 807                 videobuf_dma_sync(q,&buf->dma);
 808                 buf->state = STATE_IDLE;
 809                 break;
 810         default:
 811                 dprintk(1,"dqbuf: state invalid\n");
 812                 retval = -EINVAL;
 813                 goto done;
 814         }
 815         list_del(&buf->stream);
 816         memset(b,0,sizeof(*b));
 817         videobuf_status(b,buf,q->type);
 818
 819  done:
 820         mutex_unlock(&q->lock);
 821         return retval;
 822 }
 823
 824 int videobuf_streamon(struct videobuf_queue *q)
 825 {
 826         struct videobuf_buffer *buf;
 827         struct list_head *list;
 828         unsigned long flags=0;
 829         int retval;
 830
 831         mutex_lock(&q->lock);
 832         retval = -EBUSY;
 833         if (q->reading)
 834                 goto done;
 835         retval = 0;
 836         if (q->streaming)
 837                 goto done;
 838         q->streaming = 1;
 839         if (q->irqlock)
 840                 spin_lock_irqsave(q->irqlock,flags);
 841         list_for_each(list,&q->stream) {
 842                 buf = list_entry(list, struct videobuf_buffer, stream);
 843                 if (buf->state == STATE_PREPARED)
 844                         q->ops->buf_queue(q,buf);
 845         }
 846         if (q->irqlock)
 847                 spin_unlock_irqrestore(q->irqlock,flags);
 848
 849  done:
 850         mutex_unlock(&q->lock);
 851         return retval;
 852 }
 853
 854 int videobuf_streamoff(struct videobuf_queue *q)
 855 {
 856         int retval = -EINVAL;
 857
 858         mutex_lock(&q->lock);
 859         if (!q->streaming)
 860                 goto done;
 861         videobuf_queue_cancel(q);
 862         q->streaming = 0;
 863         retval = 0;
 864
 865  done:
 866         mutex_unlock(&q->lock);
 867         return retval;
 868 }
 869
 870 static ssize_t
 871 videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
 872                        size_t count, loff_t *ppos)
 873 {
 874         enum v4l2_field field;
 875         unsigned long flags=0;
 876         int retval;
 877
 878         /* setup stuff */
 879         q->read_buf = videobuf_alloc(q->msize);
 880         if (NULL == q->read_buf)
 881                 return -ENOMEM;
 882
 883         q->read_buf->memory = V4L2_MEMORY_USERPTR;
 884         q->read_buf->baddr  = (unsigned long)data;
 885         q->read_buf->bsize  = count;
 886         field = videobuf_next_field(q);
 887         retval = q->ops->buf_prepare(q,q->read_buf,field);
 888         if (0 != retval)
 889                 goto done;
 890
 891         /* start capture & wait */
 892         if (q->irqlock)
 893                 spin_lock_irqsave(q->irqlock,flags);
 894         q->ops->buf_queue(q,q->read_buf);
 895         if (q->irqlock)
 896                 spin_unlock_irqrestore(q->irqlock,flags);
 897         retval = videobuf_waiton(q->read_buf,0,0);
 898         if (0 == retval) {
 899                 videobuf_dma_sync(q,&q->read_buf->dma);
 900                 if (STATE_ERROR == q->read_buf->state)
 901                         retval = -EIO;
 902                 else
 903                         retval = q->read_buf->size;
 904         }
 905
 906  done:
 907         /* cleanup */
 908         q->ops->buf_release(q,q->read_buf);
 909         kfree(q->read_buf);
 910         q->read_buf = NULL;
 911         return retval;
 912 }
 913
 914 ssize_t videobuf_read_one(struct videobuf_queue *q,
 915                           char __user *data, size_t count, loff_t *ppos,
 916                           int nonblocking)
 917 {
 918         enum v4l2_field field;
 919         unsigned long flags=0;
 920         unsigned size, nbufs, bytes;
 921         int retval;
 922
 923         mutex_lock(&q->lock);
 924
 925         nbufs = 1; size = 0;
 926         q->ops->buf_setup(q,&nbufs,&size);
 927         if (NULL == q->read_buf  &&
 928             count >= size        &&
 929             !nonblocking) {
 930                 retval = videobuf_read_zerocopy(q,data,count,ppos);
 931                 if (retval >= 0  ||  retval == -EIO)
 932                         /* ok, all done */
 933                         goto done;
 934                 /* fallback to kernel bounce buffer on failures */
 935         }
 936
 937         if (NULL == q->read_buf) {
 938                 /* need to capture a new frame */
 939                 retval = -ENOMEM;
 940                 q->read_buf = videobuf_alloc(q->msize);
 941                 dprintk(1,"video alloc=0x%p\n", q->read_buf);
 942                 if (NULL == q->read_buf)
 943                         goto done;
 944                 q->read_buf->memory = V4L2_MEMORY_USERPTR;
 945                 q->read_buf->bsize = count; /* preferred size */
 946                 field = videobuf_next_field(q);
 947                 retval = q->ops->buf_prepare(q,q->read_buf,field);
 948                 if (0 != retval) {
 949                         kfree (q->read_buf);
 950                         q->read_buf = NULL;
 951                         goto done;
 952                 }
 953                 if (q->irqlock)
 954                         spin_lock_irqsave(q->irqlock,flags);
 955                 q->ops->buf_queue(q,q->read_buf);
 956                 if (q->irqlock)
 957                         spin_unlock_irqrestore(q->irqlock,flags);
 958                 q->read_off = 0;
 959         }
 960
 961         /* wait until capture is done */
 962         retval = videobuf_waiton(q->read_buf, nonblocking, 1);
 963         if (0 != retval)
 964                 goto done;
 965         videobuf_dma_sync(q,&q->read_buf->dma);
 966
 967         if (STATE_ERROR == q->read_buf->state) {
 968                 /* catch I/O errors */
 969                 q->ops->buf_release(q,q->read_buf);
 970                 kfree(q->read_buf);
 971                 q->read_buf = NULL;
 972                 retval = -EIO;
 973                 goto done;
 974         }
 975
 976         /* copy to userspace */
 977         bytes = count;
 978         if (bytes > q->read_buf->size - q->read_off)
 979                 bytes = q->read_buf->size - q->read_off;
 980         retval = -EFAULT;
 981         if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
 982                 goto done;
 983
 984         retval = bytes;
 985         q->read_off += bytes;
 986         if (q->read_off == q->read_buf->size) {
 987                 /* all data copied, cleanup */
 988                 q->ops->buf_release(q,q->read_buf);
 989                 kfree(q->read_buf);
 990                 q->read_buf = NULL;
 991         }
 992
 993  done:
 994         mutex_unlock(&q->lock);
 995         return retval;
 996 }
 997
 998 int videobuf_read_start(struct videobuf_queue *q)
 999 {
1000         enum v4l2_field field;
1001         unsigned long flags=0;
1002         int count = 0, size = 0;
1003         int err, i;
1004
1005         q->ops->buf_setup(q,&count,&size);
1006         if (count < 2)
1007                 count = 2;
1008         if (count > VIDEO_MAX_FRAME)
1009                 count = VIDEO_MAX_FRAME;
1010         size = PAGE_ALIGN(size);
1011
1012         err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
1013         if (err)
1014                 return err;
1015         for (i = 0; i < count; i++) {
1016                 field = videobuf_next_field(q);
1017                 err = q->ops->buf_prepare(q,q->bufs[i],field);
1018                 if (err)
1019                         return err;
1020                 list_add_tail(&q->bufs[i]->stream, &q->stream);
1021         }
1022         if (q->irqlock)
1023                 spin_lock_irqsave(q->irqlock,flags);
1024         for (i = 0; i < count; i++)
1025                 q->ops->buf_queue(q,q->bufs[i]);
1026         if (q->irqlock)
1027                 spin_unlock_irqrestore(q->irqlock,flags);
1028         q->reading = 1;
1029         return 0;
1030 }
1031
1032 void videobuf_read_stop(struct videobuf_queue *q)
1033 {
1034         int i;
1035
1036         videobuf_queue_cancel(q);
1037         videobuf_mmap_free(q);
1038         INIT_LIST_HEAD(&q->stream);
1039         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1040                 if (NULL == q->bufs[i])
1041                         continue;
1042                 kfree(q->bufs[i]);
1043                 q->bufs[i] = NULL;
1044         }
1045         q->read_buf = NULL;
1046         q->reading  = 0;
1047 }
1048
1049 ssize_t videobuf_read_stream(struct videobuf_queue *q,
1050                              char __user *data, size_t count, loff_t *ppos,
1051                              int vbihack, int nonblocking)
1052 {
1053         unsigned int *fc, bytes;
1054         int err, retval;
1055         unsigned long flags=0;
1056
1057         dprintk(2,"%s\n",__FUNCTION__);
1058         mutex_lock(&q->lock);
1059         retval = -EBUSY;
1060         if (q->streaming)
1061                 goto done;
1062         if (!q->reading) {
1063                 retval = videobuf_read_start(q);
1064                 if (retval < 0)
1065                         goto done;
1066         }
1067
1068         retval = 0;
1069         while (count > 0) {
1070                 /* get / wait for data */
1071                 if (NULL == q->read_buf) {
1072                         q->read_buf = list_entry(q->stream.next,
1073                                                  struct videobuf_buffer,
1074                                                  stream);
1075                         list_del(&q->read_buf->stream);
1076                         q->read_off = 0;
1077                 }
1078                 err = videobuf_waiton(q->read_buf, nonblocking, 1);
1079                 if (err < 0) {
1080                         if (0 == retval)
1081                                 retval = err;
1082                         break;
1083                 }
1084
1085                 if (q->read_buf->state == STATE_DONE) {
1086                         if (vbihack) {
1087                                 /* dirty, undocumented hack -- pass the frame counter
1088                                  * within the last four bytes of each vbi data block.
1089                                  * We need that one to maintain backward compatibility
1090                                  * to all vbi decoding software out there ... */
1091                                 fc  = (unsigned int*)q->read_buf->dma.vmalloc;
1092                                 fc += (q->read_buf->size>>2) -1;
1093                                 *fc = q->read_buf->field_count >> 1;
1094                                 dprintk(1,"vbihack: %d\n",*fc);
1095                         }
1096
1097                         /* copy stuff */
1098                         bytes = count;
1099                         if (bytes > q->read_buf->size - q->read_off)
1100                                 bytes = q->read_buf->size - q->read_off;
1101                         if (copy_to_user(data + retval,
1102                                          q->read_buf->dma.vmalloc + q->read_off,
1103                                          bytes)) {
1104                                 if (0 == retval)
1105                                         retval = -EFAULT;
1106                                 break;
1107                         }
1108                         count       -= bytes;
1109                         retval      += bytes;
1110                         q->read_off += bytes;
1111                 } else {
1112                         /* some error */
1113                         q->read_off = q->read_buf->size;
1114                         if (0 == retval)
1115                                 retval = -EIO;
1116                 }
1117
1118                 /* requeue buffer when done with copying */
1119                 if (q->read_off == q->read_buf->size) {
1120                         list_add_tail(&q->read_buf->stream,
1121                                       &q->stream);
1122                         if (q->irqlock)
1123                                 spin_lock_irqsave(q->irqlock,flags);
1124                         q->ops->buf_queue(q,q->read_buf);
1125                         if (q->irqlock)
1126                                 spin_unlock_irqrestore(q->irqlock,flags);
1127                         q->read_buf = NULL;
1128                 }
1129                 if (retval < 0)
1130                         break;
1131         }
1132
1133  done:
1134         mutex_unlock(&q->lock);
1135         return retval;
1136 }
1137
1138 unsigned int videobuf_poll_stream(struct file *file,
1139                                   struct videobuf_queue *q,
1140                                   poll_table *wait)
1141 {
1142         struct videobuf_buffer *buf = NULL;
1143         unsigned int rc = 0;
1144
1145         mutex_lock(&q->lock);
1146         if (q->streaming) {
1147                 if (!list_empty(&q->stream))
1148                         buf = list_entry(q->stream.next,
1149                                          struct videobuf_buffer, stream);
1150         } else {
1151                 if (!q->reading)
1152                         videobuf_read_start(q);
1153                 if (!q->reading) {
1154                         rc = POLLERR;
1155                 } else if (NULL == q->read_buf) {
1156                         q->read_buf = list_entry(q->stream.next,
1157                                                  struct videobuf_buffer,
1158                                                  stream);
1159                         list_del(&q->read_buf->stream);
1160                         q->read_off = 0;
1161                 }
1162                 buf = q->read_buf;
1163         }
1164         if (!buf)
1165                 rc = POLLERR;
1166
1167         if (0 == rc) {
1168                 poll_wait(file, &buf->done, wait);
1169                 if (buf->state == STATE_DONE ||
1170                     buf->state == STATE_ERROR)
1171                         rc = POLLIN|POLLRDNORM;
1172         }
1173         mutex_unlock(&q->lock);
1174         return rc;
1175 }
1176
1177 /* --------------------------------------------------------------------- */
1178
1179 static void
1180 videobuf_vm_open(struct vm_area_struct *vma)
1181 {
1182         struct videobuf_mapping *map = vma->vm_private_data;
1183
1184         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1185                 map->count,vma->vm_start,vma->vm_end);
1186         map->count++;
1187 }
1188
1189 static void
1190 videobuf_vm_close(struct vm_area_struct *vma)
1191 {
1192         struct videobuf_mapping *map = vma->vm_private_data;
1193         struct videobuf_queue *q = map->q;
1194         int i;
1195
1196         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1197                 map->count,vma->vm_start,vma->vm_end);
1198
1199         map->count--;
1200         if (0 == map->count) {
1201                 dprintk(1,"munmap %p q=%p\n",map,q);
1202                 mutex_lock(&q->lock);
1203                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1204                         if (NULL == q->bufs[i])
1205                                 continue;
1206                         if (q->bufs[i])
1207                                 ;
1208                         if (q->bufs[i]->map != map)
1209                                 continue;
1210                         q->bufs[i]->map   = NULL;
1211                         q->bufs[i]->baddr = 0;
1212                         q->ops->buf_release(q,q->bufs[i]);
1213                 }
1214                 mutex_unlock(&q->lock);
1215                 kfree(map);
1216         }
1217         return;
1218 }
1219
1220 /*
1221  * Get a anonymous page for the mapping.  Make sure we can DMA to that
1222  * memory location with 32bit PCI devices (i.e. don't use highmem for
1223  * now ...).  Bounce buffers don't work very well for the data rates
1224  * video capture has.
1225  */
1226 static struct page*
1227 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1228                    int *type)
1229 {
1230         struct page *page;
1231
1232         dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1233                 vaddr,vma->vm_start,vma->vm_end);
1234         if (vaddr > vma->vm_end)
1235                 return NOPAGE_SIGBUS;
1236         page = alloc_page(GFP_USER | __GFP_DMA32);
1237         if (!page)
1238                 return NOPAGE_OOM;
1239         clear_user_page(page_address(page), vaddr, page);
1240         if (type)
1241                 *type = VM_FAULT_MINOR;
1242         return page;
1243 }
1244
1245 static struct vm_operations_struct videobuf_vm_ops =
1246 {
1247         .open     = videobuf_vm_open,
1248         .close    = videobuf_vm_close,
1249         .nopage   = videobuf_vm_nopage,
1250 };
1251
1252 int videobuf_mmap_setup(struct videobuf_queue *q,
1253                         unsigned int bcount, unsigned int bsize,
1254                         enum v4l2_memory memory)
1255 {
1256         unsigned int i;
1257         int err;
1258
1259         err = videobuf_mmap_free(q);
1260         if (0 != err)
1261                 return err;
1262
1263         for (i = 0; i < bcount; i++) {
1264                 q->bufs[i] = videobuf_alloc(q->msize);
1265                 q->bufs[i]->i      = i;
1266                 q->bufs[i]->input  = UNSET;
1267                 q->bufs[i]->memory = memory;
1268                 q->bufs[i]->bsize  = bsize;
1269                 switch (memory) {
1270                 case V4L2_MEMORY_MMAP:
1271                         q->bufs[i]->boff  = bsize * i;
1272                         break;
1273                 case V4L2_MEMORY_USERPTR:
1274                 case V4L2_MEMORY_OVERLAY:
1275                         /* nothing */
1276                         break;
1277                 }
1278         }
1279         dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1280                 bcount,bsize);
1281         return 0;
1282 }
1283
1284 int videobuf_mmap_free(struct videobuf_queue *q)
1285 {
1286         int i;
1287
1288         for (i = 0; i < VIDEO_MAX_FRAME; i++)
1289                 if (q->bufs[i] && q->bufs[i]->map)
1290                         return -EBUSY;
1291         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1292                 if (NULL == q->bufs[i])
1293                         continue;
1294                 q->ops->buf_release(q,q->bufs[i]);
1295                 kfree(q->bufs[i]);
1296                 q->bufs[i] = NULL;
1297         }
1298         return 0;
1299 }
1300
1301 int videobuf_mmap_mapper(struct videobuf_queue *q,
1302                          struct vm_area_struct *vma)
1303 {
1304         struct videobuf_mapping *map;
1305         unsigned int first,last,size,i;
1306         int retval;
1307
1308         mutex_lock(&q->lock);
1309         retval = -EINVAL;
1310         if (!(vma->vm_flags & VM_WRITE)) {
1311                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1312                 goto done;
1313         }
1314         if (!(vma->vm_flags & VM_SHARED)) {
1315                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1316                 goto done;
1317         }
1318
1319         /* look for first buffer to map */
1320         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1321                 if (NULL == q->bufs[first])
1322                         continue;
1323                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1324                         continue;
1325                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1326                         break;
1327         }
1328         if (VIDEO_MAX_FRAME == first) {
1329                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1330                         (vma->vm_pgoff << PAGE_SHIFT));
1331                 goto done;
1332         }
1333
1334         /* look for last buffer to map */
1335         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1336                 if (NULL == q->bufs[last])
1337                         continue;
1338                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1339                         continue;
1340                 if (q->bufs[last]->map) {
1341                         retval = -EBUSY;
1342                         goto done;
1343                 }
1344                 size += q->bufs[last]->bsize;
1345                 if (size == (vma->vm_end - vma->vm_start))
1346                         break;
1347         }
1348         if (VIDEO_MAX_FRAME == last) {
1349                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1350                         (vma->vm_end - vma->vm_start));
1351                 goto done;
1352         }
1353
1354         /* create mapping + update buffer list */
1355         retval = -ENOMEM;
1356         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1357         if (NULL == map)
1358                 goto done;
1359         for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1360                 q->bufs[i]->map   = map;
1361                 q->bufs[i]->baddr = vma->vm_start + size;
1362         }
1363         map->count    = 1;
1364         map->start    = vma->vm_start;
1365         map->end      = vma->vm_end;
1366         map->q        = q;
1367         vma->vm_ops   = &videobuf_vm_ops;
1368         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1369         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1370         vma->vm_private_data = map;
1371         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1372                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1373         retval = 0;
1374
1375  done:
1376         mutex_unlock(&q->lock);
1377         return retval;
1378 }
1379
1380 /* --------------------------------------------------------------------- */
1381
1382 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1383
1384 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1385 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1386 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1387 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1388 EXPORT_SYMBOL_GPL(videobuf_dma_map);
1389 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
1390 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
1391 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1392
1393 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
1394 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
1395
1396 EXPORT_SYMBOL_GPL(videobuf_alloc);
1397 EXPORT_SYMBOL_GPL(videobuf_waiton);
1398 EXPORT_SYMBOL_GPL(videobuf_iolock);
1399
1400 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1401 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1402 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1403
1404 EXPORT_SYMBOL_GPL(videobuf_next_field);
1405 EXPORT_SYMBOL_GPL(videobuf_status);
1406 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1407 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1408 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1409 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1410 EXPORT_SYMBOL_GPL(videobuf_streamon);
1411 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1412
1413 EXPORT_SYMBOL_GPL(videobuf_read_start);
1414 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1415 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1416 EXPORT_SYMBOL_GPL(videobuf_read_one);
1417 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1418
1419 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1420 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1421 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1422
1423 /*
1424  * Local variables:
1425  * c-basic-offset: 8
1426  * End:
1427  */