1/*	$NetBSD: i2c_bitbang.h,v 1.1.4.3 2004/09/21 13:27:46 skrll 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
47struct 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
54typedef const struct i2c_bitbang_ops *i2c_bitbang_ops_t;
55
56int	i2c_bitbang_send_start(void *, int, i2c_bitbang_ops_t);
57int	i2c_bitbang_send_stop(void *, int, i2c_bitbang_ops_t);
58int	i2c_bitbang_initiate_xfer(void *, i2c_addr_t, int, i2c_bitbang_ops_t);
59int	i2c_bitbang_read_byte(void *, uint8_t *, int, i2c_bitbang_ops_t);
60int	i2c_bitbang_write_byte(void *, uint8_t, int, i2c_bitbang_ops_t);
61
62#endif /* _DEV_I2C_I2C_BITBANG_H_ */
63