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V4L/DVB (3516): Make video_buf more generic

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Video_buf were concerned to allow PCI devices to be used as
video capture devices. This patch extends video_buf features
by virtualizing pci-dependent functions and allowing other
type of devices to use it.
It is still DMA centric, although it may be used also by
devices that emulates scatter/gather behavior or a DMA device

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Mauro Carvalho Chehab 2006-03-10 12:29:15 -03:00
commit c7b0ac0546
26 changed files with 340 additions and 174 deletions
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3
include/media/saa7146_vv.h
View file

@ -197,7 +197,8 @@ void saa7146_buffer_finish(struct saa7146_dev *dev, struct saa7146_dmaqueue *q,
void saa7146_buffer_next(struct saa7146_dev *dev, struct saa7146_dmaqueue *q,int vbi);
int saa7146_buffer_queue(struct saa7146_dev *dev, struct saa7146_dmaqueue *q, struct saa7146_buf *buf);
void saa7146_buffer_timeout(unsigned long data);
void saa7146_dma_free(struct saa7146_dev *dev,struct saa7146_buf *buf);
void saa7146_dma_free(struct saa7146_dev* dev,struct videobuf_queue *q,
struct saa7146_buf *buf);
int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv);
int saa7146_vv_release(struct saa7146_dev* dev);

56
include/media/video-buf.h
View file

@ -1,15 +1,20 @@
/*
*
* generic helper functions for video4linux capture buffers, to handle
* memory management and PCI DMA. Right now bttv + saa7134 use it.
* 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 (thus it is probably not useful for USB as
* data often must be uncompressed by the drivers).
* 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
@ -38,6 +43,9 @@ struct scatterlist* videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages);
struct scatterlist* videobuf_pages_to_sg(struct page **pages, int nr_pages,
int offset);
struct videobuf_buffer;
struct videobuf_queue;
/* --------------------------------------------------------------------- */
/*
@ -49,7 +57,7 @@ struct scatterlist* videobuf_pages_to_sg(struct page **pages, int nr_pages,
* pointer + length. The kernel version just wants the size and
* does memory allocation too using vmalloc_32().
*
* videobuf_dma_pci_*()
* 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 ...)
@ -86,12 +94,18 @@ 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_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma);
int videobuf_dma_pci_sync(struct pci_dev *dev,
struct videobuf_dmabuf *dma);
int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma);
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);
/* --------------------------------------------------------------------- */
/*
@ -115,9 +129,6 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma);
*
*/
struct videobuf_buffer;
struct videobuf_queue;
struct videobuf_mapping {
unsigned int count;
unsigned long start;
@ -164,6 +175,10 @@ struct videobuf_buffer {
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);
@ -174,12 +189,20 @@ struct videobuf_queue_ops {
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;
struct pci_dev *pci;
void *dev; /* on pci, points to struct pci_dev */
enum v4l2_buf_type type;
unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
@ -204,12 +227,15 @@ struct videobuf_queue {
void* videobuf_alloc(unsigned int size);
int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
int videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb,
struct v4l2_framebuffer *fbuf);
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,
struct pci_dev *pci,
void *dev,
spinlock_t *irqlock,
enum v4l2_buf_type type,
enum v4l2_field field,