104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
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/*****************************************************************************
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Copyright(c) 2013 FCI Inc. All Rights Reserved
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File name : fci_ringbuffer.h
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Description : Header of Data Buffer control file
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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History :
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----------------------------------------------------------------------
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2010/11/25 aslan.cho initial
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*******************************************************************************/
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#ifndef __FCI_RINGBUFFER_H__
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#define __FCI_RINGBUFFER_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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struct fci_ringbuffer {
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u8 *data;
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ssize_t size;
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ssize_t pread;
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ssize_t pwrite;
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int error;
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wait_queue_head_t queue;
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spinlock_t lock;
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};
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#define FCI_RINGBUFFER_PKTHDRSIZE 3
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extern void fci_ringbuffer_init(struct fci_ringbuffer *rbuf
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, void *data, size_t len);
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extern int fci_ringbuffer_empty(struct fci_ringbuffer *rbuf);
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extern ssize_t fci_ringbuffer_free(struct fci_ringbuffer *rbuf);
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extern ssize_t fci_ringbuffer_avail(struct fci_ringbuffer *rbuf);
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extern void fci_ringbuffer_reset(struct fci_ringbuffer *rbuf);
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extern void fci_ringbuffer_flush(struct fci_ringbuffer *rbuf);
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extern void fci_ringbuffer_flush_spinlock_wakeup(struct fci_ringbuffer *rbuf);
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#define FCI_RINGBUFFER_PEEK(rbuf, offs) \
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((rbuf)->data[((rbuf)->pread+(offs)) % (rbuf)->size])
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#define FCI_RINGBUFFER_SKIP(rbuf, num) \
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((rbuf)->pread = ((rbuf)->pread+(num)) % (rbuf)->size)
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extern ssize_t fci_ringbuffer_read_user(struct fci_ringbuffer *rbuf
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, u8 __user *buf, size_t len);
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extern void fci_ringbuffer_read(struct fci_ringbuffer *rbuf
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, u8 *buf, size_t len);
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#define FCI_RINGBUFFER_WRITE_BYTE(rbuf, byte) \
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{ (rbuf)->data[(rbuf)->pwrite] = (byte); \
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(rbuf)->pwrite = ((rbuf)->pwrite + 1) % (rbuf)->size; }
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extern ssize_t fci_ringbuffer_write(struct fci_ringbuffer *rbuf
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, const u8 *buf, size_t len);
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extern ssize_t fci_ringbuffer_pkt_write(struct fci_ringbuffer *rbuf
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, u8 *buf, size_t len);
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extern ssize_t fci_ringbuffer_pkt_read_user(struct fci_ringbuffer *rbuf
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, size_t idx, int offset, u8 __user *buf, size_t len);
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extern ssize_t fci_ringbuffer_pkt_read(struct fci_ringbuffer *rbuf
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, size_t idx, int offset, u8 *buf, size_t len);
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extern void fci_ringbuffer_pkt_dispose(struct fci_ringbuffer *rbuf, size_t idx);
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extern ssize_t fci_ringbuffer_pkt_next(struct fci_ringbuffer *rbuf
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, size_t idx, size_t *pktlen);
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#ifdef __cplusplus
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}
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#endif
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#endif
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