55 lines
2.4 KiB
C
55 lines
2.4 KiB
C
/* $NetBSD: i2c_bus.h,v 1.1 1997/10/17 17:21:19 bouyer Exp $ */
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/*
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* Copyright (c) 1997 Manuel Bouyer. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Manuel Bouyer.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* The i2c bus data definitions */
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/*
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* Services provided by the adapter :
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* set/clear/read bit, where bit may be I2C_DATA, I2C_CLOCK, I2C_TXEN.
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*/
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typedef struct _i2c_adapter {
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void *adapter_softc; /* the adapter's private datas */
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void (*set_bit) __P((void *adapter_softc, u_int8_t bit));
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void (*clr_bit) __P((void *adapter_softc, u_int8_t bit));
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int (*read_bit) __P((void *adapter_softc, u_int8_t bit));
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} i2c_adapter_t;
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#define I2C_DATA 0x00
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#define I2C_CLOCK 0x01
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#define I2C_TXEN 0x02
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/* services provided by the i2c serial bus */
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int i2c_write_byte __P((i2c_adapter_t *, u_int8_t));
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int i2c_read_byte __P((i2c_adapter_t *));
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void i2c_send_start __P((i2c_adapter_t *));
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void i2c_send_stop __P((i2c_adapter_t *));
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