| /* |
| * generic helper functions for handling video4linux capture buffers |
| * |
| * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> |
| * |
| * Highly based on video-buf written originally by: |
| * (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 |
| */ |
| |
| #ifndef _VIDEOBUF_CORE_H |
| #define _VIDEOBUF_CORE_H |
| |
| #include <linux/poll.h> |
| #ifdef CONFIG_VIDEO_V4L1_COMPAT |
| #define __MIN_V4L1 |
| #include <linux/videodev.h> |
| #endif |
| #include <linux/videodev2.h> |
| |
| #define UNSET (-1U) |
| |
| |
| struct videobuf_buffer; |
| struct videobuf_queue; |
| |
| /* --------------------------------------------------------------------- */ |
| |
| /* |
| * 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; |
| struct videobuf_queue *q; |
| }; |
| |
| enum videobuf_state { |
| VIDEOBUF_NEEDS_INIT = 0, |
| VIDEOBUF_PREPARED = 1, |
| VIDEOBUF_QUEUED = 2, |
| VIDEOBUF_ACTIVE = 3, |
| VIDEOBUF_DONE = 4, |
| VIDEOBUF_ERROR = 5, |
| VIDEOBUF_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 list_head stream; /* QBUF/DQBUF list */ |
| |
| /* touched by irq handler */ |
| struct list_head queue; |
| wait_queue_head_t done; |
| unsigned int field_count; |
| struct timeval ts; |
| |
| /* Memory type */ |
| enum v4l2_memory memory; |
| |
| /* buffer size */ |
| size_t bsize; |
| |
| /* buffer offset (mmap + overlay) */ |
| size_t boff; |
| |
| /* buffer addr (userland ptr!) */ |
| unsigned long baddr; |
| |
| /* for mmap'ed buffers */ |
| struct videobuf_mapping *map; |
| |
| /* Private pointer to allow specific methods to store their data */ |
| int privsize; |
| void *priv; |
| }; |
| |
| 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); |
| }; |
| |
| #define MAGIC_QTYPE_OPS 0x12261003 |
| |
| /* Helper operations - device type dependent */ |
| struct videobuf_qtype_ops { |
| u32 magic; |
| |
| struct videobuf_buffer *(*alloc_vb)(size_t size); |
| void *(*vaddr) (struct videobuf_buffer *buf); |
| int (*iolock) (struct videobuf_queue *q, |
| struct videobuf_buffer *vb, |
| struct v4l2_framebuffer *fbuf); |
| int (*sync) (struct videobuf_queue *q, |
| struct videobuf_buffer *buf); |
| int (*mmap_mapper) (struct videobuf_queue *q, |
| struct videobuf_buffer *buf, |
| struct vm_area_struct *vma); |
| }; |
| |
| struct videobuf_queue { |
| struct mutex vb_lock; |
| struct mutex *ext_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]; |
| const struct videobuf_queue_ops *ops; |
| struct videobuf_qtype_ops *int_ops; |
| |
| unsigned int streaming:1; |
| unsigned int reading: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; |
| }; |
| |
| static inline void videobuf_queue_lock(struct videobuf_queue *q) |
| { |
| if (!q->ext_lock) |
| mutex_lock(&q->vb_lock); |
| } |
| |
| static inline void videobuf_queue_unlock(struct videobuf_queue *q) |
| { |
| if (!q->ext_lock) |
| mutex_unlock(&q->vb_lock); |
| } |
| |
| 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); |
| |
| struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q); |
| |
| /* Used on videobuf-dvb */ |
| void *videobuf_queue_to_vaddr(struct videobuf_queue *q, |
| struct videobuf_buffer *buf); |
| |
| void videobuf_queue_core_init(struct videobuf_queue *q, |
| const 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, |
| struct videobuf_qtype_ops *int_ops); |
| 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); |
| 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); |
| #ifdef CONFIG_VIDEO_V4L1_COMPAT |
| int videobuf_cgmbuf(struct videobuf_queue *q, |
| struct video_mbuf *mbuf, int count); |
| #endif |
| int videobuf_streamon(struct videobuf_queue *q); |
| int videobuf_streamoff(struct videobuf_queue *q); |
| |
| void videobuf_stop(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_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); |
| |
| #endif |