451084d2e0
Cc: David Kiliani <mail@davidkiliani.de> Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/**
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* @file mecirc_buf.h
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*
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* @brief Meilhaus circular buffer implementation.
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* @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
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* @author Guenter Gebhardt
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* @author Krzysztof Gantzke (k.gantzke@meilhaus.de)
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*/
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/*
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* Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
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*
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* This file 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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*
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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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*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _MECIRC_BUF_H_
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#define _MECIRC_BUF_H_
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# ifdef __KERNEL__
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# ifdef BOSCH
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typedef struct me_circ_buf {
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unsigned int mask;
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// unsigned int count;
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uint32_t *buf;
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int volatile head;
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int volatile tail;
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} me_circ_buf_t;
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static inline int me_circ_buf_values(me_circ_buf_t * buf)
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{
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// return ((buf->head - buf->tail) & (buf->count - 1));
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return ((buf->head - buf->tail) & (buf->mask));
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}
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static inline int me_circ_buf_space(me_circ_buf_t * buf)
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{
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// return ((buf->tail - (buf->head + 1)) & (buf->count - 1));
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return ((buf->tail - (buf->head + 1)) & (buf->mask));
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}
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static inline int me_circ_buf_values_to_end(me_circ_buf_t * buf)
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{
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int end;
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int n;
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// end = buf->count - buf->tail;
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// n = (buf->head + end) & (buf->count - 1);
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end = buf->mask + 1 - buf->tail;
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n = (buf->head + end) & (buf->mask);
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return (n < end) ? n : end;
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}
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static inline int me_circ_buf_space_to_end(me_circ_buf_t * buf)
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{
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int end;
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int n;
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// end = buf->count - 1 - buf->head;
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// n = (end + buf->tail) & (buf->count - 1);
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end = buf->mask - buf->head;
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n = (end + buf->tail) & (buf->mask);
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return (n <= end) ? n : (end + 1);
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}
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#define _CBUFF_32b_t
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# else //~BOSCH
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/// @note buf->mask = buf->count-1 = ME4600_AI_CIRC_BUF_COUNT-1
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# ifdef _CBUFF_32b_t
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//32 bit
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typedef struct me_circ_buf_32b {
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int volatile head;
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int volatile tail;
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unsigned int mask; //buffor size-1 must be 2^n-1 to work
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uint32_t *buf;
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} me_circ_buf_t;
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# else
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//16 bit
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typedef struct me_circ_buf_16b {
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int volatile head;
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int volatile tail;
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unsigned int mask; //buffor size-1 must be 2^n-1 to work
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uint16_t *buf;
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} me_circ_buf_t;
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# endif //_CBUFF_32b_t
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/** How many values is in buffer */
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static inline int me_circ_buf_values(me_circ_buf_t * buf)
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{
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return ((buf->head - buf->tail) & (buf->mask));
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}
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/** How many space left */
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static inline int me_circ_buf_space(me_circ_buf_t * buf)
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{
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return ((buf->tail - (buf->head + 1)) & (buf->mask));
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}
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/** How many values can be read from buffor in one chunck. */
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static inline int me_circ_buf_values_to_end(me_circ_buf_t * buf)
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{
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return (buf->tail <=
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buf->head) ? (buf->head - buf->tail) : (buf->mask - buf->tail +
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1);
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}
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/** How many values can be write to buffer in one chunck. */
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static inline int me_circ_buf_space_to_end(me_circ_buf_t * buf)
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{
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return (buf->tail <=
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buf->head) ? (buf->mask - buf->head + 1) : (buf->tail -
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buf->head - 1);
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}
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# endif //BOSCH
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# endif //__KERNEL__
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#endif //_MECIRC_BUF_H_
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