diff options
Diffstat (limited to 'include/media/video-buf.h')
| -rw-r--r-- | include/media/video-buf.h | 58 |
1 files changed, 42 insertions, 16 deletions
diff --git a/include/media/video-buf.h b/include/media/video-buf.h index 8ecfd78e0027..fff3fd0fbf94 100644 --- a/include/media/video-buf.h +++ b/include/media/video-buf.h @@ -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 semaphore lock; + 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, |
