[linux-2.6-block.git] / include / media / videobuf-core.h

/*
 * 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;
	unsigned long start;
	unsigned long end;
	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;

	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;
};

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);

void *videobuf_alloc(struct videobuf_queue* q);

/* Used on videobuf-dvb */
void *videobuf_queue_to_vmalloc (struct videobuf_queue* q,
				 struct videobuf_buffer *buf);

void videobuf_queue_core_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,
			 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
Commit	Line	Data
7a7d9a89 MCC	1	/*
	2	* generic helper functions for handling video4linux capture buffers
	3	*
	4	* (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
	5	*
	6	* Highly based on video-buf written originally by:
	7	* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
	8	* (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
	9	* (c) 2006 Ted Walther and John Sokol
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2
	14	*/
	15
59d34489 MCC	16	#ifndef _VIDEOBUF_CORE_H
	17	#define _VIDEOBUF_CORE_H
	18
7a7d9a89 MCC	19	#include <linux/poll.h>
7a7d9a89 MCC	20	#ifdef CONFIG_VIDEO_V4L1_COMPAT
5e585ef1	21	#define __MIN_V4L1
7a7d9a89 MCC	22	#include <linux/videodev.h>
	23	#endif
	24	#include <linux/videodev2.h>
	25
	26	#define UNSET (-1U)
	27
	28
	29	struct videobuf_buffer;
	30	struct videobuf_queue;
	31
	32	/* --------------------------------------------------------------------- */
	33
	34	/*
	35	* A small set of helper functions to manage video4linux buffers.
	36	*
	37	* struct videobuf_buffer holds the data structures used by the helper
	38	* functions, additionally some commonly used fields for v4l buffers
	39	* (width, height, lists, waitqueue) are in there. That struct should
	40	* be used as first element in the drivers buffer struct.
	41	*
	42	* about the mmap helpers (videobuf_mmap_*):
	43	*
	44	* The mmaper function allows to map any subset of contingous buffers.
	45	* This includes one mmap() call for all buffers (which the original
	46	* video4linux API uses) as well as one mmap() for every single buffer
	47	* (which v4l2 uses).
	48	*
	49	* If there is a valid mapping for a buffer, buffer->baddr/bsize holds
	50	* userspace address + size which can be feeded into the
	51	* videobuf_dma_init_user function listed above.
	52	*
	53	*/
	54
	55	struct videobuf_mapping {
	56	unsigned int count;
	57	unsigned long start;
	58	unsigned long end;
	59	struct videobuf_queue *q;
	60	};
	61
	62	enum videobuf_state {
0fc0686e BP	63	VIDEOBUF_NEEDS_INIT = 0,
	64	VIDEOBUF_PREPARED = 1,
	65	VIDEOBUF_QUEUED = 2,
	66	VIDEOBUF_ACTIVE = 3,
	67	VIDEOBUF_DONE = 4,
	68	VIDEOBUF_ERROR = 5,
	69	VIDEOBUF_IDLE = 6,
7a7d9a89 MCC	70	};
	71
	72	struct videobuf_buffer {
	73	unsigned int i;
	74	u32 magic;
	75
	76	/* info about the buffer */
	77	unsigned int width;
	78	unsigned int height;
	79	unsigned int bytesperline; /* use only if != 0 */
	80	unsigned long size;
	81	unsigned int input;
	82	enum v4l2_field field;
	83	enum videobuf_state state;
	84	struct list_head stream; /* QBUF/DQBUF list */
	85
	86	/* touched by irq handler */
	87	struct list_head queue;
	88	wait_queue_head_t done;
	89	unsigned int field_count;
	90	struct timeval ts;
	91
	92	/* Memory type */
	93	enum v4l2_memory memory;
	94
	95	/* buffer size */
	96	size_t bsize;
	97
	98	/* buffer offset (mmap + overlay) */
	99	size_t boff;
	100
	101	/* buffer addr (userland ptr!) */
	102	unsigned long baddr;
	103
851c0c96 MCC	104	/* for mmap'ed buffers */
	105	struct videobuf_mapping *map;
	106
7a7d9a89 MCC	107	/* Private pointer to allow specific methods to store their data */
	108	int privsize;
	109	void *priv;
	110	};
	111
	112	struct videobuf_queue_ops {
	113	int (buf_setup)(struct videobuf_queue q,
	114	unsigned int count, unsigned int size);
	115	int (buf_prepare)(struct videobuf_queue q,
	116	struct videobuf_buffer *vb,
	117	enum v4l2_field field);
	118	void (buf_queue)(struct videobuf_queue q,
	119	struct videobuf_buffer *vb);
	120	void (buf_release)(struct videobuf_queue q,
	121	struct videobuf_buffer *vb);
	122	};
	123
	124	#define MAGIC_QTYPE_OPS 0x12261003
	125
	126	/* Helper operations - device type dependent */
	127	struct videobuf_qtype_ops {
	128	u32 magic;
	129
59d34489 MCC	130	void (alloc) (size_t size);
59d34489 MCC	131	void (vmalloc) (struct videobuf_buffer *buf);
7a7d9a89 MCC	132	int (iolock) (struct videobuf_queue q,
	133	struct videobuf_buffer *vb,
	134	struct v4l2_framebuffer *fbuf);
	135	int (mmap) (struct videobuf_queue q,
	136	unsigned int *count,
	137	unsigned int *size,
	138	enum v4l2_memory memory);
	139	int (sync) (struct videobuf_queue q,
	140	struct videobuf_buffer *buf);
13bcd5d0	141	int (video_copy_to_user)(struct videobuf_queue q,
7a7d9a89 MCC	142	char __user *data,
	143	size_t count,
	144	int nonblocking);
	145	int (copy_stream) (struct videobuf_queue q,
	146	char __user *data,
	147	size_t count,
	148	size_t pos,
	149	int vbihack,
	150	int nonblocking);
	151	int (mmap_free) (struct videobuf_queue q);
	152	int (mmap_mapper) (struct videobuf_queue q,
	153	struct vm_area_struct *vma);
7a7d9a89 MCC	154	};
	155
	156	struct videobuf_queue {
64f9477f	157	struct mutex vb_lock;
7a7d9a89	158	spinlock_t *irqlock;
e9bcf667	159	struct device *dev;
7a7d9a89	160
137d1cb1 BP	161	wait_queue_head_t wait; /* wait if queue is empty */
137d1cb1 BP	162
7a7d9a89 MCC	163	enum v4l2_buf_type type;
	164	unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
	165	unsigned int msize;
	166	enum v4l2_field field;
	167	enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
	168	struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
	169	struct videobuf_queue_ops *ops;
	170	struct videobuf_qtype_ops *int_ops;
	171
d6964aa8 BP	172	unsigned int streaming:1;
d6964aa8 BP	173	unsigned int reading:1;
d05051c8 MCC	174	unsigned int is_mmapped:1;
d05051c8 MCC	175
7a7d9a89	176	/* capture via mmap() + ioctl(QBUF/DQBUF) */
7a7d9a89 MCC	177	struct list_head stream;
	178
	179	/* capture via read() */
7a7d9a89 MCC	180	unsigned int read_off;
	181	struct videobuf_buffer *read_buf;
	182
	183	/* driver private data */
	184	void *priv_data;
7a7d9a89 MCC	185	};
	186
	187	int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
	188	int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
	189	struct v4l2_framebuffer *fbuf);
	190
	191	void videobuf_alloc(struct videobuf_queue q);
	192
59d34489 MCC	193	/* Used on videobuf-dvb */
	194	void videobuf_queue_to_vmalloc (struct videobuf_queue q,
	195	struct videobuf_buffer *buf);
	196
d4cae5a5	197	void videobuf_queue_core_init(struct videobuf_queue *q,
7a7d9a89	198	struct videobuf_queue_ops *ops,
e9bcf667	199	struct device *dev,
7a7d9a89 MCC	200	spinlock_t *irqlock,
	201	enum v4l2_buf_type type,
	202	enum v4l2_field field,
	203	unsigned int msize,
d4cae5a5 MCC	204	void *priv,
d4cae5a5 MCC	205	struct videobuf_qtype_ops *int_ops);
7a7d9a89 MCC	206	int videobuf_queue_is_busy(struct videobuf_queue *q);
	207	void videobuf_queue_cancel(struct videobuf_queue *q);
	208
	209	enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
	210	int videobuf_reqbufs(struct videobuf_queue *q,
	211	struct v4l2_requestbuffers *req);
	212	int videobuf_querybuf(struct videobuf_queue q, struct v4l2_buffer b);
	213	int videobuf_qbuf(struct videobuf_queue *q,
	214	struct v4l2_buffer *b);
	215	int videobuf_dqbuf(struct videobuf_queue *q,
	216	struct v4l2_buffer *b, int nonblocking);
	217	#ifdef CONFIG_VIDEO_V4L1_COMPAT
	218	int videobuf_cgmbuf(struct videobuf_queue *q,
	219	struct video_mbuf *mbuf, int count);
	220	#endif
	221	int videobuf_streamon(struct videobuf_queue *q);
	222	int videobuf_streamoff(struct videobuf_queue *q);
	223
19bc5133 BP	224	void videobuf_stop(struct videobuf_queue *q);
19bc5133 BP	225
7a7d9a89 MCC	226	int videobuf_read_start(struct videobuf_queue *q);
	227	void videobuf_read_stop(struct videobuf_queue *q);
	228	ssize_t videobuf_read_stream(struct videobuf_queue *q,
	229	char __user data, size_t count, loff_t ppos,
	230	int vbihack, int nonblocking);
	231	ssize_t videobuf_read_one(struct videobuf_queue *q,
	232	char __user data, size_t count, loff_t ppos,
	233	int nonblocking);
	234	unsigned int videobuf_poll_stream(struct file *file,
	235	struct videobuf_queue *q,
	236	poll_table *wait);
	237
	238	int videobuf_mmap_setup(struct videobuf_queue *q,
	239	unsigned int bcount, unsigned int bsize,
	240	enum v4l2_memory memory);
81b2dbca AV	241	int __videobuf_mmap_setup(struct videobuf_queue *q,
	242	unsigned int bcount, unsigned int bsize,
	243	enum v4l2_memory memory);
7a7d9a89 MCC	244	int videobuf_mmap_free(struct videobuf_queue *q);
	245	int videobuf_mmap_mapper(struct videobuf_queue *q,
	246	struct vm_area_struct *vma);
	247
59d34489	248	#endif