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/* Helper operations -
device type dependent */ struct videobuf_qtype_ops { u32 magic; void *(*alloc) (size_t size); void *(*vmalloc) (struct videobuf_buffer *buf); int (*iolock) (struct videobuf_queue* q, struct videobuf_buffer *vb, struct v4l2_framebuffer *fbuf); int (*mmap) (struct videobuf_queue *q, unsigned int *count, unsigned int *size, enum v4l2_memory memory); int (*sync) (struct videobuf_queue* q, struct videobuf_buffer *buf); int (*video_copy_to_user)(struct videobuf_queue *q, char __user *data, size_t count, int nonblocking); int (*copy_stream) (struct videobuf_queue *q, char __user *data, size_t count, size_t pos, int vbihack, int nonblocking); int (*mmap_free) (struct videobuf_queue *q); int (*mmap_mapper) (struct videobuf_queue *q, struct vm_area_struct *vma); }; struct videobuf_queue { struct mutex vb_lock; spinlock_t *irqlock; struct device *dev; wait_queue_head_t wait; /* wait if queue is empty */ 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; struct videobuf_qtype_ops *int_ops; unsigned int streaming:1; unsigned int reading:1; unsigned int is_mmapped:1; /* capture via mmap() + ioctl(QBUF/DQBUF) */ struct list_head stream; /* capture via read() */ unsigned int read_off; struct videobuf_buffer *read_buf; /* driver private data */ void *priv_data; }; /* * 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/PCI/PCI-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; /* for overlay buffers (pci-pci dma) */ dma_addr_t bus_addr; /* common */ struct scatterlist *sglist; int sglen; int nr_pages; int direction; }; struct videobuf_dma_sg_memory { u32 magic; /* for mmap'ed buffers */ struct videobuf_dmabuf dma; }; 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); struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf); void *videobuf_sg_alloc(size_t size); void videobuf_queue_sg_init(struct videobuf_queue* q, struct videobuf_queue_ops *ops, struct device *dev, spinlock_t *irqlock, enum v4l2_buf_type type, enum v4l2_field field, unsigned int msize, void *priv); /*FIXME: these variants are used only on *-alsa code, where videobuf is * used without queue */ int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma); int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma); |
