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      1 /*	$NetBSD: i2c_bitbang.h,v 1.2 2005/12/11 12:21:22 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2003 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed for the NetBSD Project by
     20  *      Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #ifndef _DEV_I2C_I2C_BITBANG_H_
     39 #define	_DEV_I2C_I2C_BITBANG_H_
     40 
     41 #define	I2C_BIT_SDA		0	/* SDA signal */
     42 #define	I2C_BIT_SCL		1	/* SCL signal */
     43 #define	I2C_BIT_OUTPUT		2	/* controller: SDA is output */
     44 #define	I2C_BIT_INPUT		3	/* controller: SDA is input */
     45 #define	I2C_NBITS		4
     46 
     47 struct i2c_bitbang_ops {
     48 	void		(*ibo_set_bits)(void *, uint32_t);
     49 	void		(*ibo_set_dir)(void *, uint32_t);
     50 	uint32_t	(*ibo_read_bits)(void *);
     51 	uint32_t	ibo_bits[I2C_NBITS];
     52 };
     53 
     54 typedef const struct i2c_bitbang_ops *i2c_bitbang_ops_t;
     55 
     56 int	i2c_bitbang_send_start(void *, int, i2c_bitbang_ops_t);
     57 int	i2c_bitbang_send_stop(void *, int, i2c_bitbang_ops_t);
     58 int	i2c_bitbang_initiate_xfer(void *, i2c_addr_t, int, i2c_bitbang_ops_t);
     59 int	i2c_bitbang_read_byte(void *, uint8_t *, int, i2c_bitbang_ops_t);
     60 int	i2c_bitbang_write_byte(void *, uint8_t, int, i2c_bitbang_ops_t);
     61 
     62 #endif /* _DEV_I2C_I2C_BITBANG_H_ */
     63