+++ /dev/null
-/*
- *
- * generic helper functions for video4linux capture buffers, to handle
- * memory management and PCI DMA.
- * Right now, bttv, saa7134, saa7146 and cx88 use it.
- *
- * The functions expect the hardware being able to scatter gatter
- * (i.e. the buffers are not linear in physical memory, but fragmented
- * into PAGE_SIZE chunks). They also assume the driver does not need
- * to touch the video data.
- *
- * device specific map/unmap/sync stuff now are mapped as operations
- * to allow its usage by USB and virtual devices.
- *
- * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
- * (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
- * (c) 2006 Ted Walther and John Sokol
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/pagemap.h>
-#include <linux/slab.h>
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-
-#include <media/video-buf.h>
-
-#define MAGIC_DMABUF 0x19721112
-#define MAGIC_BUFFER 0x20040302
-#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
- { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
-
-static int debug = 0;
-module_param(debug, int, 0644);
-
-MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
-MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
-MODULE_LICENSE("GPL");
-
-#define dprintk(level, fmt, arg...) if (debug >= level) \
- printk(KERN_DEBUG "vbuf: " fmt , ## arg)
-
-struct scatterlist*
-videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
-{
- struct scatterlist *sglist;
- struct page *pg;
- int i;
-
- sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
- if (NULL == sglist)
- return NULL;
- for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
- pg = vmalloc_to_page(virt);
- if (NULL == pg)
- goto err;
- BUG_ON(PageHighMem(pg));
- sglist[i].page = pg;
- sglist[i].length = PAGE_SIZE;
- }
- return sglist;
-
- err:
- kfree(sglist);
- return NULL;
-}
-
-struct scatterlist*
-videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
-{
- struct scatterlist *sglist;
- int i = 0;
-
- if (NULL == pages[0])
- return NULL;
- sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
- if (NULL == sglist)
- return NULL;
-
- if (NULL == pages[0])
- goto nopage;
- if (PageHighMem(pages[0]))
- /* DMA to highmem pages might not work */
- goto highmem;
- sglist[0].page = pages[0];
- sglist[0].offset = offset;
- sglist[0].length = PAGE_SIZE - offset;
- for (i = 1; i < nr_pages; i++) {
- if (NULL == pages[i])
- goto nopage;
- if (PageHighMem(pages[i]))
- goto highmem;
- sglist[i].page = pages[i];
- sglist[i].length = PAGE_SIZE;
- }
- return sglist;
-
- nopage:
- dprintk(2,"sgl: oops - no page\n");
- kfree(sglist);
- return NULL;
-
- highmem:
- dprintk(2,"sgl: oops - highmem page\n");
- kfree(sglist);
- return NULL;
-}
-
-/* --------------------------------------------------------------------- */
-
-void videobuf_dma_init(struct videobuf_dmabuf *dma)
-{
- memset(dma,0,sizeof(*dma));
- dma->magic = MAGIC_DMABUF;
-}
-
-int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
- unsigned long data, unsigned long size)
-{
- unsigned long first,last;
- int err, rw = 0;
-
- dma->direction = direction;
- switch (dma->direction) {
- case PCI_DMA_FROMDEVICE: rw = READ; break;
- case PCI_DMA_TODEVICE: rw = WRITE; break;
- default: BUG();
- }
-
- first = (data & PAGE_MASK) >> PAGE_SHIFT;
- last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
- dma->offset = data & ~PAGE_MASK;
- dma->nr_pages = last-first+1;
- dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
- GFP_KERNEL);
- if (NULL == dma->pages)
- return -ENOMEM;
- dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
- data,size,dma->nr_pages);
-
- dma->varea = (void *) data;
-
- down_read(¤t->mm->mmap_sem);
- err = get_user_pages(current,current->mm,
- data & PAGE_MASK, dma->nr_pages,
- rw == READ, 1, /* force */
- dma->pages, NULL);
- up_read(¤t->mm->mmap_sem);
- if (err != dma->nr_pages) {
- dma->nr_pages = (err >= 0) ? err : 0;
- dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
- return err < 0 ? err : -EINVAL;
- }
- return 0;
-}
-
-int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
- int nr_pages)
-{
- dprintk(1,"init kernel [%d pages]\n",nr_pages);
- dma->direction = direction;
- dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
- if (NULL == dma->vmalloc) {
- dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
- return -ENOMEM;
- }
- dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
- (unsigned long)dma->vmalloc,
- nr_pages << PAGE_SHIFT);
- memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
- dma->nr_pages = nr_pages;
- return 0;
-}
-
-int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
- dma_addr_t addr, int nr_pages)
-{
- dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
- nr_pages,(unsigned long)addr);
- dma->direction = direction;
- if (0 == addr)
- return -EINVAL;
-
- dma->bus_addr = addr;
- dma->nr_pages = nr_pages;
- return 0;
-}
-
-int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
-{
- void *dev=q->dev;
-
- MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
- BUG_ON(0 == dma->nr_pages);
-
- if (dma->pages) {
- dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
- dma->offset);
- }
- if (dma->vmalloc) {
- dma->sglist = videobuf_vmalloc_to_sg
- (dma->vmalloc,dma->nr_pages);
- }
- if (dma->bus_addr) {
- dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
- if (NULL != dma->sglist) {
- dma->sglen = 1;
- sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
- dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
- sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
- }
- }
- if (NULL == dma->sglist) {
- dprintk(1,"scatterlist is NULL\n");
- return -ENOMEM;
- }
- if (!dma->bus_addr) {
- if (q->ops->vb_map_sg) {
- dma->sglen = q->ops->vb_map_sg(dev,dma->sglist,
- dma->nr_pages, dma->direction);
- }
- if (0 == dma->sglen) {
- printk(KERN_WARNING
- "%s: videobuf_map_sg failed\n",__FUNCTION__);
- kfree(dma->sglist);
- dma->sglist = NULL;
- dma->sglen = 0;
- return -EIO;
- }
- }
- return 0;
-}
-
-int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
-{
- void *dev=q->dev;
-
- MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
- BUG_ON(!dma->sglen);
-
- if (!dma->bus_addr && q->ops->vb_dma_sync_sg)
- q->ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
- dma->direction);
-
- return 0;
-}
-
-int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
-{
- void *dev=q->dev;
-
- MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
- if (!dma->sglen)
- return 0;
-
- if (!dma->bus_addr && q->ops->vb_unmap_sg)
- q->ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
- dma->direction);
- kfree(dma->sglist);
- dma->sglist = NULL;
- dma->sglen = 0;
- return 0;
-}
-
-int videobuf_dma_free(struct videobuf_dmabuf *dma)
-{
- MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
- BUG_ON(dma->sglen);
-
- if (dma->pages) {
- int i;
- for (i=0; i < dma->nr_pages; i++)
- page_cache_release(dma->pages[i]);
- kfree(dma->pages);
- dma->pages = NULL;
- }
-
- vfree(dma->vmalloc);
- dma->vmalloc = NULL;
- dma->varea = NULL;
-
- if (dma->bus_addr) {
- dma->bus_addr = 0;
- }
- dma->direction = PCI_DMA_NONE;
- return 0;
-}
-
-/* --------------------------------------------------------------------- */
-
-void* videobuf_alloc(unsigned int size)
-{
- struct videobuf_buffer *vb;
-
- vb = kzalloc(size,GFP_KERNEL);
- if (NULL != vb) {
- videobuf_dma_init(&vb->dma);
- init_waitqueue_head(&vb->done);
- vb->magic = MAGIC_BUFFER;
- }
- return vb;
-}
-
-int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
-{
- int retval = 0;
- DECLARE_WAITQUEUE(wait, current);
-
- MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
- add_wait_queue(&vb->done, &wait);
- while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
- if (non_blocking) {
- retval = -EAGAIN;
- break;
- }
- set_current_state(intr ? TASK_INTERRUPTIBLE
- : TASK_UNINTERRUPTIBLE);
- if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
- schedule();
- set_current_state(TASK_RUNNING);
- if (intr && signal_pending(current)) {
- dprintk(1,"buffer waiton: -EINTR\n");
- retval = -EINTR;
- break;
- }
- }
- remove_wait_queue(&vb->done, &wait);
- return retval;
-}
-
-int
-videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
- struct v4l2_framebuffer *fbuf)
-{
- int err,pages;
- dma_addr_t bus;
-
- MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
- switch (vb->memory) {
- case V4L2_MEMORY_MMAP:
- case V4L2_MEMORY_USERPTR:
- if (0 == vb->baddr) {
- /* no userspace addr -- kernel bounce buffer */
- pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
- err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
- pages);
- if (0 != err)
- return err;
- } else {
- /* dma directly to userspace */
- err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
- vb->baddr,vb->bsize);
- if (0 != err)
- return err;
- }
- break;
- case V4L2_MEMORY_OVERLAY:
- if (NULL == fbuf)
- return -EINVAL;
- /* FIXME: need sanity checks for vb->boff */
- /*
- * Using a double cast to avoid compiler warnings when
- * building for PAE. Compiler doesn't like direct casting
- * of a 32 bit ptr to 64 bit integer.
- */
- bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
- pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
- err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
- bus, pages);
- if (0 != err)
- return err;
- break;
- default:
- BUG();
- }
- err = videobuf_dma_map(q,&vb->dma);
- if (0 != err)
- return err;
-
- return 0;
-}
-
-/* --------------------------------------------------------------------- */
-
-void videobuf_queue_pci(struct videobuf_queue* q)
-{
- /* If not specified, defaults to PCI map sg */
- if (!q->ops->vb_map_sg)
- q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
-
- if (!q->ops->vb_dma_sync_sg)
- q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
- if (!q->ops->vb_unmap_sg)
- q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
-}
-
-int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
-{
- struct videobuf_queue q;
- struct videobuf_queue_ops qops;
-
- q.dev=pci;
- qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
- qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
- q.ops = &qops;
-
- return (videobuf_dma_map(&q,dma));
-}
-
-int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
-{
- struct videobuf_queue q;
- struct videobuf_queue_ops qops;
-
- q.dev=pci;
- qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
- qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
- q.ops = &qops;
-
- return (videobuf_dma_unmap(&q,dma));
-}
-
-void videobuf_queue_init(struct videobuf_queue* q,
- struct videobuf_queue_ops *ops,
- void *dev,
- spinlock_t *irqlock,
- enum v4l2_buf_type type,
- enum v4l2_field field,
- unsigned int msize,
- void *priv)
-{
- memset(q,0,sizeof(*q));
- q->irqlock = irqlock;
- q->dev = dev;
- q->type = type;
- q->field = field;
- q->msize = msize;
- q->ops = ops;
- q->priv_data = priv;
-
- videobuf_queue_pci(q);
-
- mutex_init(&q->lock);
- INIT_LIST_HEAD(&q->stream);
-}
-
-int
-videobuf_queue_is_busy(struct videobuf_queue *q)
-{
- int i;
-
- if (q->streaming) {
- dprintk(1,"busy: streaming active\n");
- return 1;
- }
- if (q->reading) {
- dprintk(1,"busy: pending read #1\n");
- return 1;
- }
- if (q->read_buf) {
- dprintk(1,"busy: pending read #2\n");
- return 1;
- }
- for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == q->bufs[i])
- continue;
- if (q->bufs[i]->map) {
- dprintk(1,"busy: buffer #%d mapped\n",i);
- return 1;
- }
- if (q->bufs[i]->state == STATE_QUEUED) {
- dprintk(1,"busy: buffer #%d queued\n",i);
- return 1;
- }
- if (q->bufs[i]->state == STATE_ACTIVE) {
- dprintk(1,"busy: buffer #%d avtive\n",i);
- return 1;
- }
- }
- return 0;
-}
-
-void
-videobuf_queue_cancel(struct videobuf_queue *q)
-{
- unsigned long flags=0;
- int i;
-
- /* remove queued buffers from list */
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == q->bufs[i])
- continue;
- if (q->bufs[i]->state == STATE_QUEUED) {
- list_del(&q->bufs[i]->queue);
- q->bufs[i]->state = STATE_ERROR;
- }
- }
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
-
- /* free all buffers + clear queue */
- for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == q->bufs[i])
- continue;
- q->ops->buf_release(q,q->bufs[i]);
- }
- INIT_LIST_HEAD(&q->stream);
-}
-
-/* --------------------------------------------------------------------- */
-
-enum v4l2_field
-videobuf_next_field(struct videobuf_queue *q)
-{
- enum v4l2_field field = q->field;
-
- BUG_ON(V4L2_FIELD_ANY == field);
-
- if (V4L2_FIELD_ALTERNATE == field) {
- if (V4L2_FIELD_TOP == q->last) {
- field = V4L2_FIELD_BOTTOM;
- q->last = V4L2_FIELD_BOTTOM;
- } else {
- field = V4L2_FIELD_TOP;
- q->last = V4L2_FIELD_TOP;
- }
- }
- return field;
-}
-
-void
-videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
- enum v4l2_buf_type type)
-{
- MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
-
- b->index = vb->i;
- b->type = type;
-
- b->memory = vb->memory;
- switch (b->memory) {
- case V4L2_MEMORY_MMAP:
- b->m.offset = vb->boff;
- b->length = vb->bsize;
- break;
- case V4L2_MEMORY_USERPTR:
- b->m.userptr = vb->baddr;
- b->length = vb->bsize;
- break;
- case V4L2_MEMORY_OVERLAY:
- b->m.offset = vb->boff;
- break;
- }
-
- b->flags = 0;
- if (vb->map)
- b->flags |= V4L2_BUF_FLAG_MAPPED;
-
- switch (vb->state) {
- case STATE_PREPARED:
- case STATE_QUEUED:
- case STATE_ACTIVE:
- b->flags |= V4L2_BUF_FLAG_QUEUED;
- break;
- case STATE_DONE:
- case STATE_ERROR:
- b->flags |= V4L2_BUF_FLAG_DONE;
- break;
- case STATE_NEEDS_INIT:
- case STATE_IDLE:
- /* nothing */
- break;
- }
-
- if (vb->input != UNSET) {
- b->flags |= V4L2_BUF_FLAG_INPUT;
- b->input = vb->input;
- }
-
- b->field = vb->field;
- b->timestamp = vb->ts;
- b->bytesused = vb->size;
- b->sequence = vb->field_count >> 1;
-}
-
-int
-videobuf_reqbufs(struct videobuf_queue *q,
- struct v4l2_requestbuffers *req)
-{
- unsigned int size,count;
- int retval;
-
- if (req->type != q->type) {
- dprintk(1,"reqbufs: queue type invalid\n");
- return -EINVAL;
- }
- if (req->count < 1) {
- dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
- return -EINVAL;
- }
- if (req->memory != V4L2_MEMORY_MMAP &&
- req->memory != V4L2_MEMORY_USERPTR &&
- req->memory != V4L2_MEMORY_OVERLAY) {
- dprintk(1,"reqbufs: memory type invalid\n");
- return -EINVAL;
- }
-
- if (q->streaming) {
- dprintk(1,"reqbufs: streaming already exists\n");
- return -EBUSY;
- }
- if (!list_empty(&q->stream)) {
- dprintk(1,"reqbufs: stream running\n");
- return -EBUSY;
- }
-
- mutex_lock(&q->lock);
- count = req->count;
- if (count > VIDEO_MAX_FRAME)
- count = VIDEO_MAX_FRAME;
- size = 0;
- q->ops->buf_setup(q,&count,&size);
- size = PAGE_ALIGN(size);
- dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
- count, size, (count*size)>>PAGE_SHIFT);
-
- retval = videobuf_mmap_setup(q,count,size,req->memory);
- if (retval < 0) {
- dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
- goto done;
- }
-
- req->count = count;
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-int
-videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
-{
- if (unlikely(b->type != q->type)) {
- dprintk(1,"querybuf: Wrong type.\n");
- return -EINVAL;
- }
- if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
- dprintk(1,"querybuf: index out of range.\n");
- return -EINVAL;
- }
- if (unlikely(NULL == q->bufs[b->index])) {
- dprintk(1,"querybuf: buffer is null.\n");
- return -EINVAL;
- }
- videobuf_status(b,q->bufs[b->index],q->type);
- return 0;
-}
-
-int
-videobuf_qbuf(struct videobuf_queue *q,
- struct v4l2_buffer *b)
-{
- struct videobuf_buffer *buf;
- enum v4l2_field field;
- unsigned long flags=0;
- int retval;
-
- mutex_lock(&q->lock);
- retval = -EBUSY;
- if (q->reading) {
- dprintk(1,"qbuf: Reading running...\n");
- goto done;
- }
- retval = -EINVAL;
- if (b->type != q->type) {
- dprintk(1,"qbuf: Wrong type.\n");
- goto done;
- }
- if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
- dprintk(1,"qbuf: index out of range.\n");
- goto done;
- }
- buf = q->bufs[b->index];
- if (NULL == buf) {
- dprintk(1,"qbuf: buffer is null.\n");
- goto done;
- }
- MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
- if (buf->memory != b->memory) {
- dprintk(1,"qbuf: memory type is wrong.\n");
- goto done;
- }
- if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
- dprintk(1,"qbuf: buffer is already queued or active.\n");
- goto done;
- }
-
- if (b->flags & V4L2_BUF_FLAG_INPUT) {
- if (b->input >= q->inputs) {
- dprintk(1,"qbuf: wrong input.\n");
- goto done;
- }
- buf->input = b->input;
- } else {
- buf->input = UNSET;
- }
-
- switch (b->memory) {
- case V4L2_MEMORY_MMAP:
- if (0 == buf->baddr) {
- dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
- goto done;
- }
- break;
- case V4L2_MEMORY_USERPTR:
- if (b->length < buf->bsize) {
- dprintk(1,"qbuf: buffer length is not enough\n");
- goto done;
- }
- if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
- q->ops->buf_release(q,buf);
- buf->baddr = b->m.userptr;
- break;
- case V4L2_MEMORY_OVERLAY:
- buf->boff = b->m.offset;
- break;
- default:
- dprintk(1,"qbuf: wrong memory type\n");
- goto done;
- }
-
- dprintk(1,"qbuf: requesting next field\n");
- field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(q,buf,field);
- if (0 != retval) {
- dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
- goto done;
- }
-
- list_add_tail(&buf->stream,&q->stream);
- if (q->streaming) {
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
- }
- dprintk(1,"qbuf: succeded\n");
- retval = 0;
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-int
-videobuf_dqbuf(struct videobuf_queue *q,
- struct v4l2_buffer *b, int nonblocking)
-{
- struct videobuf_buffer *buf;
- int retval;
-
- mutex_lock(&q->lock);
- retval = -EBUSY;
- if (q->reading) {
- dprintk(1,"dqbuf: Reading running...\n");
- goto done;
- }
- retval = -EINVAL;
- if (b->type != q->type) {
- dprintk(1,"dqbuf: Wrong type.\n");
- goto done;
- }
- if (list_empty(&q->stream)) {
- dprintk(1,"dqbuf: stream running\n");
- goto done;
- }
- buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
- retval = videobuf_waiton(buf, nonblocking, 1);
- if (retval < 0) {
- dprintk(1,"dqbuf: waiton returned %d\n",retval);
- goto done;
- }
- switch (buf->state) {
- case STATE_ERROR:
- dprintk(1,"dqbuf: state is error\n");
- retval = -EIO;
- videobuf_dma_sync(q,&buf->dma);
- buf->state = STATE_IDLE;
- break;
- case STATE_DONE:
- dprintk(1,"dqbuf: state is done\n");
- videobuf_dma_sync(q,&buf->dma);
- buf->state = STATE_IDLE;
- break;
- default:
- dprintk(1,"dqbuf: state invalid\n");
- retval = -EINVAL;
- goto done;
- }
- list_del(&buf->stream);
- memset(b,0,sizeof(*b));
- videobuf_status(b,buf,q->type);
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-int videobuf_streamon(struct videobuf_queue *q)
-{
- struct videobuf_buffer *buf;
- struct list_head *list;
- unsigned long flags=0;
- int retval;
-
- mutex_lock(&q->lock);
- retval = -EBUSY;
- if (q->reading)
- goto done;
- retval = 0;
- if (q->streaming)
- goto done;
- q->streaming = 1;
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- list_for_each(list,&q->stream) {
- buf = list_entry(list, struct videobuf_buffer, stream);
- if (buf->state == STATE_PREPARED)
- q->ops->buf_queue(q,buf);
- }
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-int videobuf_streamoff(struct videobuf_queue *q)
-{
- int retval = -EINVAL;
-
- mutex_lock(&q->lock);
- if (!q->streaming)
- goto done;
- videobuf_queue_cancel(q);
- q->streaming = 0;
- retval = 0;
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-static ssize_t
-videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
- size_t count, loff_t *ppos)
-{
- enum v4l2_field field;
- unsigned long flags=0;
- int retval;
-
- /* setup stuff */
- q->read_buf = videobuf_alloc(q->msize);
- if (NULL == q->read_buf)
- return -ENOMEM;
-
- q->read_buf->memory = V4L2_MEMORY_USERPTR;
- q->read_buf->baddr = (unsigned long)data;
- q->read_buf->bsize = count;
- field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(q,q->read_buf,field);
- if (0 != retval)
- goto done;
-
- /* start capture & wait */
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,q->read_buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
- retval = videobuf_waiton(q->read_buf,0,0);
- if (0 == retval) {
- videobuf_dma_sync(q,&q->read_buf->dma);
- if (STATE_ERROR == q->read_buf->state)
- retval = -EIO;
- else
- retval = q->read_buf->size;
- }
-
- done:
- /* cleanup */
- q->ops->buf_release(q,q->read_buf);
- kfree(q->read_buf);
- q->read_buf = NULL;
- return retval;
-}
-
-ssize_t videobuf_read_one(struct videobuf_queue *q,
- char __user *data, size_t count, loff_t *ppos,
- int nonblocking)
-{
- enum v4l2_field field;
- unsigned long flags=0;
- unsigned size, nbufs, bytes;
- int retval;
-
- mutex_lock(&q->lock);
-
- nbufs = 1; size = 0;
- q->ops->buf_setup(q,&nbufs,&size);
- if (NULL == q->read_buf &&
- count >= size &&
- !nonblocking) {
- retval = videobuf_read_zerocopy(q,data,count,ppos);
- if (retval >= 0 || retval == -EIO)
- /* ok, all done */
- goto done;
- /* fallback to kernel bounce buffer on failures */
- }
-
- if (NULL == q->read_buf) {
- /* need to capture a new frame */
- retval = -ENOMEM;
- q->read_buf = videobuf_alloc(q->msize);
- dprintk(1,"video alloc=0x%p\n", q->read_buf);
- if (NULL == q->read_buf)
- goto done;
- q->read_buf->memory = V4L2_MEMORY_USERPTR;
- q->read_buf->bsize = count; /* preferred size */
- field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(q,q->read_buf,field);
- if (0 != retval) {
- kfree (q->read_buf);
- q->read_buf = NULL;
- goto done;
- }
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,q->read_buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
- q->read_off = 0;
- }
-
- /* wait until capture is done */
- retval = videobuf_waiton(q->read_buf, nonblocking, 1);
- if (0 != retval)
- goto done;
- videobuf_dma_sync(q,&q->read_buf->dma);
-
- if (STATE_ERROR == q->read_buf->state) {
- /* catch I/O errors */
- q->ops->buf_release(q,q->read_buf);
- kfree(q->read_buf);
- q->read_buf = NULL;
- retval = -EIO;
- goto done;
- }
-
- /* copy to userspace */
- bytes = count;
- if (bytes > q->read_buf->size - q->read_off)
- bytes = q->read_buf->size - q->read_off;
- retval = -EFAULT;
- if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
- goto done;
-
- retval = bytes;
- q->read_off += bytes;
- if (q->read_off == q->read_buf->size) {
- /* all data copied, cleanup */
- q->ops->buf_release(q,q->read_buf);
- kfree(q->read_buf);
- q->read_buf = NULL;
- }
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-int videobuf_read_start(struct videobuf_queue *q)
-{
- enum v4l2_field field;
- unsigned long flags=0;
- int count = 0, size = 0;
- int err, i;
-
- q->ops->buf_setup(q,&count,&size);
- if (count < 2)
- count = 2;
- if (count > VIDEO_MAX_FRAME)
- count = VIDEO_MAX_FRAME;
- size = PAGE_ALIGN(size);
-
- err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
- if (err)
- return err;
- for (i = 0; i < count; i++) {
- field = videobuf_next_field(q);
- err = q->ops->buf_prepare(q,q->bufs[i],field);
- if (err)
- return err;
- list_add_tail(&q->bufs[i]->stream, &q->stream);
- }
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- for (i = 0; i < count; i++)
- q->ops->buf_queue(q,q->bufs[i]);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
- q->reading = 1;
- return 0;
-}
-
-void videobuf_read_stop(struct videobuf_queue *q)
-{
- int i;
-
- videobuf_queue_cancel(q);
- videobuf_mmap_free(q);
- INIT_LIST_HEAD(&q->stream);
- for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == q->bufs[i])
- continue;
- kfree(q->bufs[i]);
- q->bufs[i] = NULL;
- }
- q->read_buf = NULL;
- q->reading = 0;
-}
-
-ssize_t videobuf_read_stream(struct videobuf_queue *q,
- char __user *data, size_t count, loff_t *ppos,
- int vbihack, int nonblocking)
-{
- unsigned int *fc, bytes;
- int err, retval;
- unsigned long flags=0;
-
- dprintk(2,"%s\n",__FUNCTION__);
- mutex_lock(&q->lock);
- retval = -EBUSY;
- if (q->streaming)
- goto done;
- if (!q->reading) {
- retval = videobuf_read_start(q);
- if (retval < 0)
- goto done;
- }
-
- retval = 0;
- while (count > 0) {
- /* get / wait for data */
- if (NULL == q->read_buf) {
- q->read_buf = list_entry(q->stream.next,
- struct videobuf_buffer,
- stream);
- list_del(&q->read_buf->stream);
- q->read_off = 0;
- }
- err = videobuf_waiton(q->read_buf, nonblocking, 1);
- if (err < 0) {
- if (0 == retval)
- retval = err;
- break;
- }
-
- if (q->read_buf->state == STATE_DONE) {
- if (vbihack) {
- /* dirty, undocumented hack -- pass the frame counter
- * within the last four bytes of each vbi data block.
- * We need that one to maintain backward compatibility
- * to all vbi decoding software out there ... */
- fc = (unsigned int*)q->read_buf->dma.vmalloc;
- fc += (q->read_buf->size>>2) -1;
- *fc = q->read_buf->field_count >> 1;
- dprintk(1,"vbihack: %d\n",*fc);
- }
-
- /* copy stuff */
- bytes = count;
- if (bytes > q->read_buf->size - q->read_off)
- bytes = q->read_buf->size - q->read_off;
- if (copy_to_user(data + retval,
- q->read_buf->dma.vmalloc + q->read_off,
- bytes)) {
- if (0 == retval)
- retval = -EFAULT;
- break;
- }
- count -= bytes;
- retval += bytes;
- q->read_off += bytes;
- } else {
- /* some error */
- q->read_off = q->read_buf->size;
- if (0 == retval)
- retval = -EIO;
- }
-
- /* requeue buffer when done with copying */
- if (q->read_off == q->read_buf->size) {
- list_add_tail(&q->read_buf->stream,
- &q->stream);
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,q->read_buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
- q->read_buf = NULL;
- }
- if (retval < 0)
- break;
- }
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-unsigned int videobuf_poll_stream(struct file *file,
- struct videobuf_queue *q,
- poll_table *wait)
-{
- struct videobuf_buffer *buf = NULL;
- unsigned int rc = 0;
-
- mutex_lock(&q->lock);
- if (q->streaming) {
- if (!list_empty(&q->stream))
- buf = list_entry(q->stream.next,
- struct videobuf_buffer, stream);
- } else {
- if (!q->reading)
- videobuf_read_start(q);
- if (!q->reading) {
- rc = POLLERR;
- } else if (NULL == q->read_buf) {
- q->read_buf = list_entry(q->stream.next,
- struct videobuf_buffer,
- stream);
- list_del(&q->read_buf->stream);
- q->read_off = 0;
- }
- buf = q->read_buf;
- }
- if (!buf)
- rc = POLLERR;
-
- if (0 == rc) {
- poll_wait(file, &buf->done, wait);
- if (buf->state == STATE_DONE ||
- buf->state == STATE_ERROR)
- rc = POLLIN|POLLRDNORM;
- }
- mutex_unlock(&q->lock);
- return rc;
-}
-
-/* --------------------------------------------------------------------- */
-
-static void
-videobuf_vm_open(struct vm_area_struct *vma)
-{
- struct videobuf_mapping *map = vma->vm_private_data;
-
- dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
- map->count,vma->vm_start,vma->vm_end);
- map->count++;
-}
-
-static void
-videobuf_vm_close(struct vm_area_struct *vma)
-{
- struct videobuf_mapping *map = vma->vm_private_data;
- struct videobuf_queue *q = map->q;
- int i;
-
- dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
- map->count,vma->vm_start,vma->vm_end);
-
- map->count--;
- if (0 == map->count) {
- dprintk(1,"munmap %p q=%p\n",map,q);
- mutex_lock(&q->lock);
- for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == q->bufs[i])
- continue;
- if (q->bufs[i])
- ;
- if (q->bufs[i]->map != map)
- continue;
- q->bufs[i]->map = NULL;
- q->bufs[i]->baddr = 0;
- q->ops->buf_release(q,q->bufs[i]);
- }
- mutex_unlock(&q->lock);
- kfree(map);
- }
- return;
-}
-
-/*
- * Get a anonymous page for the mapping. Make sure we can DMA to that
- * memory location with 32bit PCI devices (i.e. don't use highmem for
- * now ...). Bounce buffers don't work very well for the data rates
- * video capture has.
- */
-static struct page*
-videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
- int *type)
-{
- struct page *page;
-
- dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
- vaddr,vma->vm_start,vma->vm_end);
- if (vaddr > vma->vm_end)
- return NOPAGE_SIGBUS;
- page = alloc_page(GFP_USER | __GFP_DMA32);
- if (!page)
- return NOPAGE_OOM;
- clear_user_page(page_address(page), vaddr, page);
- if (type)
- *type = VM_FAULT_MINOR;
- return page;
-}
-
-static struct vm_operations_struct videobuf_vm_ops =
-{
- .open = videobuf_vm_open,
- .close = videobuf_vm_close,
- .nopage = videobuf_vm_nopage,
-};
-
-int videobuf_mmap_setup(struct videobuf_queue *q,
- unsigned int bcount, unsigned int bsize,
- enum v4l2_memory memory)
-{
- unsigned int i;
- int err;
-
- err = videobuf_mmap_free(q);
- if (0 != err)
- return err;
-
- for (i = 0; i < bcount; i++) {
- q->bufs[i] = videobuf_alloc(q->msize);
- q->bufs[i]->i = i;
- q->bufs[i]->input = UNSET;
- q->bufs[i]->memory = memory;
- q->bufs[i]->bsize = bsize;
- switch (memory) {
- case V4L2_MEMORY_MMAP:
- q->bufs[i]->boff = bsize * i;
- break;
- case V4L2_MEMORY_USERPTR:
- case V4L2_MEMORY_OVERLAY:
- /* nothing */
- break;
- }
- }
- dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
- bcount,bsize);
- return 0;
-}
-
-int videobuf_mmap_free(struct videobuf_queue *q)
-{
- int i;
-
- for (i = 0; i < VIDEO_MAX_FRAME; i++)
- if (q->bufs[i] && q->bufs[i]->map)
- return -EBUSY;
- for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == q->bufs[i])
- continue;
- q->ops->buf_release(q,q->bufs[i]);
- kfree(q->bufs[i]);
- q->bufs[i] = NULL;
- }
- return 0;
-}
-
-int videobuf_mmap_mapper(struct videobuf_queue *q,
- struct vm_area_struct *vma)
-{
- struct videobuf_mapping *map;
- unsigned int first,last,size,i;
- int retval;
-
- mutex_lock(&q->lock);
- retval = -EINVAL;
- if (!(vma->vm_flags & VM_WRITE)) {
- dprintk(1,"mmap app bug: PROT_WRITE please\n");
- goto done;
- }
- if (!(vma->vm_flags & VM_SHARED)) {
- dprintk(1,"mmap app bug: MAP_SHARED please\n");
- goto done;
- }
-
- /* look for first buffer to map */
- for (first = 0; first < VIDEO_MAX_FRAME; first++) {
- if (NULL == q->bufs[first])
- continue;
- if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
- continue;
- if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
- break;
- }
- if (VIDEO_MAX_FRAME == first) {
- dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
- (vma->vm_pgoff << PAGE_SHIFT));
- goto done;
- }
-
- /* look for last buffer to map */
- for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
- if (NULL == q->bufs[last])
- continue;
- if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
- continue;
- if (q->bufs[last]->map) {
- retval = -EBUSY;
- goto done;
- }
- size += q->bufs[last]->bsize;
- if (size == (vma->vm_end - vma->vm_start))
- break;
- }
- if (VIDEO_MAX_FRAME == last) {
- dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
- (vma->vm_end - vma->vm_start));
- goto done;
- }
-
- /* create mapping + update buffer list */
- retval = -ENOMEM;
- map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
- if (NULL == map)
- goto done;
- for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
- q->bufs[i]->map = map;
- q->bufs[i]->baddr = vma->vm_start + size;
- }
- map->count = 1;
- map->start = vma->vm_start;
- map->end = vma->vm_end;
- map->q = q;
- vma->vm_ops = &videobuf_vm_ops;
- vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
- vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
- vma->vm_private_data = map;
- dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
- map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
- retval = 0;
-
- done:
- mutex_unlock(&q->lock);
- return retval;
-}
-
-/* --------------------------------------------------------------------- */
-
-EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
-
-EXPORT_SYMBOL_GPL(videobuf_dma_init);
-EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
-EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
-EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
-EXPORT_SYMBOL_GPL(videobuf_dma_map);
-EXPORT_SYMBOL_GPL(videobuf_dma_sync);
-EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
-EXPORT_SYMBOL_GPL(videobuf_dma_free);
-
-EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
-EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
-
-EXPORT_SYMBOL_GPL(videobuf_alloc);
-EXPORT_SYMBOL_GPL(videobuf_waiton);
-EXPORT_SYMBOL_GPL(videobuf_iolock);
-
-EXPORT_SYMBOL_GPL(videobuf_queue_init);
-EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
-EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
-
-EXPORT_SYMBOL_GPL(videobuf_next_field);
-EXPORT_SYMBOL_GPL(videobuf_status);
-EXPORT_SYMBOL_GPL(videobuf_reqbufs);
-EXPORT_SYMBOL_GPL(videobuf_querybuf);
-EXPORT_SYMBOL_GPL(videobuf_qbuf);
-EXPORT_SYMBOL_GPL(videobuf_dqbuf);
-EXPORT_SYMBOL_GPL(videobuf_streamon);
-EXPORT_SYMBOL_GPL(videobuf_streamoff);
-
-EXPORT_SYMBOL_GPL(videobuf_read_start);
-EXPORT_SYMBOL_GPL(videobuf_read_stop);
-EXPORT_SYMBOL_GPL(videobuf_read_stream);
-EXPORT_SYMBOL_GPL(videobuf_read_one);
-EXPORT_SYMBOL_GPL(videobuf_poll_stream);
-
-EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
-EXPORT_SYMBOL_GPL(videobuf_mmap_free);
-EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
-
-/*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
+++ /dev/null
-/*
- *
- * generic helper functions for video4linux capture buffers, to handle
- * memory management and PCI DMA.
- * Right now, bttv, saa7134, saa7146 and cx88 use it.
- *
- * The functions expect the hardware being able to scatter gatter
- * (i.e. the buffers are not linear in physical memory, but fragmented
- * into PAGE_SIZE chunks). They also assume the driver does not need
- * to touch the video data.
- *
- * device specific map/unmap/sync stuff now are mapped as file operations
- * to allow its usage by USB and virtual devices.
- *
- * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
- * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
- * (c) 2006 Ted Walther and John Sokol
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/videodev2.h>
-#include <linux/poll.h>
-
-#define UNSET (-1U)
-
-/* --------------------------------------------------------------------- */
-
-/*
- * Return a scatterlist for some page-aligned vmalloc()'ed memory
- * block (NULL on errors). Memory for the scatterlist is allocated
- * using kmalloc. The caller must free the memory.
- */
-struct scatterlist* videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages);
-
-/*
- * Return a scatterlist for a an array of userpages (NULL on errors).
- * Memory for the scatterlist is allocated using kmalloc. The caller
- * must free the memory.
- */
-struct scatterlist* videobuf_pages_to_sg(struct page **pages, int nr_pages,
- int offset);
-
-struct videobuf_buffer;
-struct videobuf_queue;
-
-/* --------------------------------------------------------------------- */
-
-/*
- * A small set of helper functions to manage buffers (both userland
- * and kernel) for DMA.
- *
- * videobuf_dma_init_*()
- * creates a buffer. The userland version takes a userspace
- * pointer + length. The kernel version just wants the size and
- * does memory allocation too using vmalloc_32().
- *
- * videobuf_dma_*()
- * see Documentation/DMA-mapping.txt, these functions to
- * basically the same. The map function does also build a
- * scatterlist for the buffer (and unmap frees it ...)
- *
- * videobuf_dma_free()
- * no comment ...
- *
- */
-
-struct videobuf_dmabuf {
- u32 magic;
-
- /* for userland buffer */
- int offset;
- struct page **pages;
-
- /* for kernel buffers */
- void *vmalloc;
-
- /* Stores the userspace pointer to vmalloc area */
- void *varea;
-
- /* for overlay buffers (pci-pci dma) */
- dma_addr_t bus_addr;
-
- /* common */
- struct scatterlist *sglist;
- int sglen;
- int nr_pages;
- int direction;
-};
-
-void videobuf_dma_init(struct videobuf_dmabuf *dma);
-int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
- unsigned long data, unsigned long size);
-int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
- int nr_pages);
-int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
- dma_addr_t addr, int nr_pages);
-int videobuf_dma_free(struct videobuf_dmabuf *dma);
-
-int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
-int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
-int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
-
- /*FIXME: these variants are used only on *-alsa code, where videobuf is
- * used without queue
- */
-int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma);
-int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma);
-
-/* --------------------------------------------------------------------- */
-
-/*
- * A small set of helper functions to manage video4linux buffers.
- *
- * struct videobuf_buffer holds the data structures used by the helper
- * functions, additionally some commonly used fields for v4l buffers
- * (width, height, lists, waitqueue) are in there. That struct should
- * be used as first element in the drivers buffer struct.
- *
- * about the mmap helpers (videobuf_mmap_*):
- *
- * The mmaper function allows to map any subset of contingous buffers.
- * This includes one mmap() call for all buffers (which the original
- * video4linux API uses) as well as one mmap() for every single buffer
- * (which v4l2 uses).
- *
- * If there is a valid mapping for a buffer, buffer->baddr/bsize holds
- * userspace address + size which can be feeded into the
- * videobuf_dma_init_user function listed above.
- *
- */
-
-struct videobuf_mapping {
- unsigned int count;
- unsigned long start;
- unsigned long end;
- struct videobuf_queue *q;
-};
-
-enum videobuf_state {
- STATE_NEEDS_INIT = 0,
- STATE_PREPARED = 1,
- STATE_QUEUED = 2,
- STATE_ACTIVE = 3,
- STATE_DONE = 4,
- STATE_ERROR = 5,
- STATE_IDLE = 6,
-};
-
-struct videobuf_buffer {
- unsigned int i;
- u32 magic;
-
- /* info about the buffer */
- unsigned int width;
- unsigned int height;
- unsigned int bytesperline; /* use only if != 0 */
- unsigned long size;
- unsigned int input;
- enum v4l2_field field;
- enum videobuf_state state;
- struct videobuf_dmabuf dma;
- struct list_head stream; /* QBUF/DQBUF list */
-
- /* for mmap'ed buffers */
- enum v4l2_memory memory;
- size_t boff; /* buffer offset (mmap + overlay) */
- size_t bsize; /* buffer size */
- unsigned long baddr; /* buffer addr (userland ptr!) */
- struct videobuf_mapping *map;
-
- /* touched by irq handler */
- struct list_head queue;
- wait_queue_head_t done;
- unsigned int field_count;
- struct timeval ts;
-};
-
-typedef int (vb_map_sg_t)(void *dev,struct scatterlist *sglist,int nr_pages,
- int direction);
-
-
-struct videobuf_queue_ops {
- int (*buf_setup)(struct videobuf_queue *q,
- unsigned int *count, unsigned int *size);
- int (*buf_prepare)(struct videobuf_queue *q,
- struct videobuf_buffer *vb,
- enum v4l2_field field);
- void (*buf_queue)(struct videobuf_queue *q,
- struct videobuf_buffer *vb);
- void (*buf_release)(struct videobuf_queue *q,
- struct videobuf_buffer *vb);
-
- /* Helper operations - device dependent.
- * If null, videobuf_init defaults all to PCI handling
- */
-
- vb_map_sg_t *vb_map_sg;
- vb_map_sg_t *vb_dma_sync_sg;
- vb_map_sg_t *vb_unmap_sg;
-};
-
-struct videobuf_queue {
- struct mutex lock;
- spinlock_t *irqlock;
- void *dev; /* on pci, points to struct pci_dev */
-
- enum v4l2_buf_type type;
- unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
- unsigned int msize;
- enum v4l2_field field;
- enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
- struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
- struct videobuf_queue_ops *ops;
-
- /* capture via mmap() + ioctl(QBUF/DQBUF) */
- unsigned int streaming;
- struct list_head stream;
-
- /* capture via read() */
- unsigned int reading;
- unsigned int read_off;
- struct videobuf_buffer *read_buf;
-
- /* driver private data */
- void *priv_data;
-};
-
-void* videobuf_alloc(unsigned int size);
-int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
-int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
- struct v4l2_framebuffer *fbuf);
-
-/* Maps fops to PCI stuff */
-void videobuf_queue_pci(struct videobuf_queue* q);
-
-void videobuf_queue_init(struct videobuf_queue *q,
- struct videobuf_queue_ops *ops,
- void *dev,
- spinlock_t *irqlock,
- enum v4l2_buf_type type,
- enum v4l2_field field,
- unsigned int msize,
- void *priv);
-int videobuf_queue_is_busy(struct videobuf_queue *q);
-void videobuf_queue_cancel(struct videobuf_queue *q);
-
-enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
-void videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
- enum v4l2_buf_type type);
-int videobuf_reqbufs(struct videobuf_queue *q,
- struct v4l2_requestbuffers *req);
-int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
-int videobuf_qbuf(struct videobuf_queue *q,
- struct v4l2_buffer *b);
-int videobuf_dqbuf(struct videobuf_queue *q,
- struct v4l2_buffer *b, int nonblocking);
-int videobuf_streamon(struct videobuf_queue *q);
-int videobuf_streamoff(struct videobuf_queue *q);
-
-int videobuf_read_start(struct videobuf_queue *q);
-void videobuf_read_stop(struct videobuf_queue *q);
-ssize_t videobuf_read_stream(struct videobuf_queue *q,
- char __user *data, size_t count, loff_t *ppos,
- int vbihack, int nonblocking);
-ssize_t videobuf_read_one(struct videobuf_queue *q,
- char __user *data, size_t count, loff_t *ppos,
- int nonblocking);
-unsigned int videobuf_poll_stream(struct file *file,
- struct videobuf_queue *q,
- poll_table *wait);
-
-int videobuf_mmap_setup(struct videobuf_queue *q,
- unsigned int bcount, unsigned int bsize,
- enum v4l2_memory memory);
-int videobuf_mmap_free(struct videobuf_queue *q);
-int videobuf_mmap_mapper(struct videobuf_queue *q,
- struct vm_area_struct *vma);
-
-/* --------------------------------------------------------------------- */
-
-/*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
projects / linux-2.6 / commitdiff