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/*****************************************************************************
Copyright(c) 2010 FCI Inc. All Rights Reserved
File name : fci_ringbuffer.h
Description :
History :
----------------------------------------------------------------------
2010/11/25 aslan.cho initial
*******************************************************************************/
#ifndef __FCI_RINGBUFFER_H__
#define __FCI_RINGBUFFER_H__
#ifdef __cplusplus
extern "C" {
#endif
#include <linux/spinlock.h>
#include <linux/wait.h>
struct fci_ringbuffer {
u8 *data;
ssize_t size;
ssize_t pread;
ssize_t pwrite;
int error;
wait_queue_head_t queue;
spinlock_t lock;
};
#define FCI_RINGBUFFER_PKTHDRSIZE 3
extern void fci_ringbuffer_init(struct fci_ringbuffer *rbuf
, void *data, size_t len);
extern int fci_ringbuffer_empty(struct fci_ringbuffer *rbuf);
extern ssize_t fci_ringbuffer_free(struct fci_ringbuffer *rbuf);
extern ssize_t fci_ringbuffer_avail(struct fci_ringbuffer *rbuf);
extern void fci_ringbuffer_reset(struct fci_ringbuffer *rbuf);
extern void fci_ringbuffer_flush(struct fci_ringbuffer *rbuf);
extern void fci_ringbuffer_flush_spinlock_wakeup(struct fci_ringbuffer *rbuf);
#define FCI_RINGBUFFER_PEEK(rbuf, offs) \
((rbuf)->data[((rbuf)->pread+(offs)) % (rbuf)->size])
#define FCI_RINGBUFFER_SKIP(rbuf, num) \
((rbuf)->pread = ((rbuf)->pread+(num)) % (rbuf)->size)
extern ssize_t fci_ringbuffer_read_user(struct fci_ringbuffer *rbuf
, u8 __user *buf, size_t len);
extern void fci_ringbuffer_read(struct fci_ringbuffer *rbuf
, u8 *buf, size_t len);
#define FCI_RINGBUFFER_WRITE_BYTE(rbuf, byte) \
{ (rbuf)->data[(rbuf)->pwrite] = (byte); \
(rbuf)->pwrite = ((rbuf)->pwrite + 1) % (rbuf)->size; }
extern ssize_t fci_ringbuffer_write(struct fci_ringbuffer *rbuf
, const u8 *buf, size_t len);
extern ssize_t fci_ringbuffer_pkt_write(struct fci_ringbuffer *rbuf
, u8 *buf, size_t len);
extern ssize_t fci_ringbuffer_pkt_read_user(struct fci_ringbuffer *rbuf
, size_t idx, int offset, u8 __user *buf, size_t len);
extern ssize_t fci_ringbuffer_pkt_read(struct fci_ringbuffer *rbuf
, size_t idx, int offset, u8 *buf, size_t len);
extern void fci_ringbuffer_pkt_dispose(struct fci_ringbuffer *rbuf, size_t idx);
extern ssize_t fci_ringbuffer_pkt_next(struct fci_ringbuffer *rbuf
, size_t idx, size_t *pktlen);
#ifdef __cplusplus
}
#endif
#endif
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