[net-next-2.6.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;
	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_queue *q, 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,
			 struct mutex *ext_lock);
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;
7a7d9a89 MCC	57	struct videobuf_queue *q;
	58	};
	59
	60	enum videobuf_state {
0fc0686e BP	61	VIDEOBUF_NEEDS_INIT = 0,
	62	VIDEOBUF_PREPARED = 1,
	63	VIDEOBUF_QUEUED = 2,
	64	VIDEOBUF_ACTIVE = 3,
	65	VIDEOBUF_DONE = 4,
	66	VIDEOBUF_ERROR = 5,
	67	VIDEOBUF_IDLE = 6,
7a7d9a89 MCC	68	};
	69
	70	struct videobuf_buffer {
	71	unsigned int i;
	72	u32 magic;
	73
	74	/* info about the buffer */
	75	unsigned int width;
	76	unsigned int height;
	77	unsigned int bytesperline; /* use only if != 0 */
	78	unsigned long size;
	79	unsigned int input;
	80	enum v4l2_field field;
	81	enum videobuf_state state;
	82	struct list_head stream; /* QBUF/DQBUF list */
	83
	84	/* touched by irq handler */
	85	struct list_head queue;
	86	wait_queue_head_t done;
	87	unsigned int field_count;
	88	struct timeval ts;
	89
	90	/* Memory type */
	91	enum v4l2_memory memory;
	92
	93	/* buffer size */
	94	size_t bsize;
	95
	96	/* buffer offset (mmap + overlay) */
	97	size_t boff;
	98
	99	/* buffer addr (userland ptr!) */
	100	unsigned long baddr;
	101
851c0c96 MCC	102	/* for mmap'ed buffers */
	103	struct videobuf_mapping *map;
	104
7a7d9a89 MCC	105	/* Private pointer to allow specific methods to store their data */
	106	int privsize;
	107	void *priv;
	108	};
	109
	110	struct videobuf_queue_ops {
	111	int (buf_setup)(struct videobuf_queue q,
	112	unsigned int count, unsigned int size);
	113	int (buf_prepare)(struct videobuf_queue q,
	114	struct videobuf_buffer *vb,
	115	enum v4l2_field field);
	116	void (buf_queue)(struct videobuf_queue q,
	117	struct videobuf_buffer *vb);
	118	void (buf_release)(struct videobuf_queue q,
	119	struct videobuf_buffer *vb);
	120	};
	121
	122	#define MAGIC_QTYPE_OPS 0x12261003
	123
	124	/* Helper operations - device type dependent */
	125	struct videobuf_qtype_ops {
	126	u32 magic;
	127
33c38283	128	struct videobuf_buffer (alloc_vb)(size_t size);
037c75eb	129	void (vaddr) (struct videobuf_buffer *buf);
7a02264c	130	int (iolock) (struct videobuf_queue q,
7a7d9a89 MCC	131	struct videobuf_buffer *vb,
7a7d9a89 MCC	132	struct v4l2_framebuffer *fbuf);
7a02264c	133	int (sync) (struct videobuf_queue q,
7a7d9a89	134	struct videobuf_buffer *buf);
7a7d9a89	135	int (mmap_mapper) (struct videobuf_queue q,
0b62b737 HV	136	struct videobuf_buffer *buf,
0b62b737 HV	137	struct vm_area_struct *vma);
7a7d9a89 MCC	138	};
	139
	140	struct videobuf_queue {
64f9477f	141	struct mutex vb_lock;
97397687	142	struct mutex *ext_lock;
7a7d9a89	143	spinlock_t *irqlock;
e9bcf667	144	struct device *dev;
7a7d9a89	145
137d1cb1 BP	146	wait_queue_head_t wait; /* wait if queue is empty */
137d1cb1 BP	147
7a7d9a89 MCC	148	enum v4l2_buf_type type;
	149	unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
	150	unsigned int msize;
	151	enum v4l2_field field;
	152	enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
	153	struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
38a54f35	154	const struct videobuf_queue_ops *ops;
7a7d9a89 MCC	155	struct videobuf_qtype_ops *int_ops;
7a7d9a89 MCC	156
d6964aa8 BP	157	unsigned int streaming:1;
d6964aa8 BP	158	unsigned int reading:1;
d05051c8	159
7a7d9a89	160	/* capture via mmap() + ioctl(QBUF/DQBUF) */
7a7d9a89 MCC	161	struct list_head stream;
	162
	163	/* capture via read() */
7a7d9a89 MCC	164	unsigned int read_off;
	165	struct videobuf_buffer *read_buf;
	166
	167	/* driver private data */
	168	void *priv_data;
7a7d9a89 MCC	169	};
7a7d9a89 MCC	170
97397687 HV	171	static inline void videobuf_queue_lock(struct videobuf_queue *q)
	172	{
	173	if (!q->ext_lock)
	174	mutex_lock(&q->vb_lock);
	175	}
	176
	177	static inline void videobuf_queue_unlock(struct videobuf_queue *q)
	178	{
	179	if (!q->ext_lock)
	180	mutex_unlock(&q->vb_lock);
	181	}
	182
0e0809a5 HV	183	int videobuf_waiton(struct videobuf_queue q, struct videobuf_buffer vb,
0e0809a5 HV	184	int non_blocking, int intr);
7a02264c	185	int videobuf_iolock(struct videobuf_queue q, struct videobuf_buffer vb,
7a7d9a89 MCC	186	struct v4l2_framebuffer *fbuf);
7a7d9a89 MCC	187
33c38283	188	struct videobuf_buffer videobuf_alloc_vb(struct videobuf_queue q);
7a7d9a89	189
59d34489	190	/* Used on videobuf-dvb */
f4fce60e HV	191	void videobuf_queue_to_vaddr(struct videobuf_queue q,
f4fce60e HV	192	struct videobuf_buffer *buf);
59d34489	193
d4cae5a5	194	void videobuf_queue_core_init(struct videobuf_queue *q,
38a54f35	195	const struct videobuf_queue_ops *ops,
e9bcf667	196	struct device *dev,
7a7d9a89 MCC	197	spinlock_t *irqlock,
	198	enum v4l2_buf_type type,
	199	enum v4l2_field field,
	200	unsigned int msize,
d4cae5a5	201	void *priv,
08bff03e HV	202	struct videobuf_qtype_ops *int_ops,
08bff03e HV	203	struct mutex *ext_lock);
7a7d9a89 MCC	204	int videobuf_queue_is_busy(struct videobuf_queue *q);
	205	void videobuf_queue_cancel(struct videobuf_queue *q);
	206
	207	enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
	208	int videobuf_reqbufs(struct videobuf_queue *q,
	209	struct v4l2_requestbuffers *req);
	210	int videobuf_querybuf(struct videobuf_queue q, struct v4l2_buffer b);
	211	int videobuf_qbuf(struct videobuf_queue *q,
	212	struct v4l2_buffer *b);
	213	int videobuf_dqbuf(struct videobuf_queue *q,
	214	struct v4l2_buffer *b, int nonblocking);
	215	#ifdef CONFIG_VIDEO_V4L1_COMPAT
	216	int videobuf_cgmbuf(struct videobuf_queue *q,
	217	struct video_mbuf *mbuf, int count);
	218	#endif
	219	int videobuf_streamon(struct videobuf_queue *q);
	220	int videobuf_streamoff(struct videobuf_queue *q);
	221
19bc5133 BP	222	void videobuf_stop(struct videobuf_queue *q);
19bc5133 BP	223
7a7d9a89 MCC	224	int videobuf_read_start(struct videobuf_queue *q);
	225	void videobuf_read_stop(struct videobuf_queue *q);
	226	ssize_t videobuf_read_stream(struct videobuf_queue *q,
	227	char __user data, size_t count, loff_t ppos,
	228	int vbihack, int nonblocking);
	229	ssize_t videobuf_read_one(struct videobuf_queue *q,
	230	char __user data, size_t count, loff_t ppos,
	231	int nonblocking);
	232	unsigned int videobuf_poll_stream(struct file *file,
	233	struct videobuf_queue *q,
	234	poll_table *wait);
	235
	236	int videobuf_mmap_setup(struct videobuf_queue *q,
	237	unsigned int bcount, unsigned int bsize,
	238	enum v4l2_memory memory);
81b2dbca AV	239	int __videobuf_mmap_setup(struct videobuf_queue *q,
	240	unsigned int bcount, unsigned int bsize,
	241	enum v4l2_memory memory);
7a7d9a89 MCC	242	int videobuf_mmap_free(struct videobuf_queue *q);
	243	int videobuf_mmap_mapper(struct videobuf_queue *q,
	244	struct vm_area_struct *vma);
	245
59d34489	246	#endif