1 /* $OpenBSD: i2c_bitbang.h,v 1.3 2006/01/13 23:56:46 grange Exp $ */
2 /* $NetBSD: i2c_bitbang.h,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
3
4 /*
5 * Copyright (c) 2003 Wasabi Systems, Inc.
6 * All rights reserved.
7 *
8 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed for the NetBSD Project by
21 * Wasabi Systems, Inc.
22 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
23 * or promote products derived from this software without specific prior
24 * written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #ifndef _DEV_I2C_I2C_BITBANG_H_
40 #define _DEV_I2C_I2C_BITBANG_H_
41
42 #define I2C_BIT_SDA 0 /* SDA signal */
43 #define I2C_BIT_SCL 1 /* SCL signal */
44 #define I2C_BIT_OUTPUT 2 /* controller: SDA is output */
45 #define I2C_BIT_INPUT 3 /* controller: SDA is input */
46 #define I2C_NBITS 4
47
48 struct i2c_bitbang_ops {
49 void (*ibo_set_bits)(void *, uint32_t);
50 void (*ibo_set_dir)(void *, uint32_t);
51 uint32_t (*ibo_read_bits)(void *);
52 uint32_t ibo_bits[I2C_NBITS];
53 };
54
55 typedef const struct i2c_bitbang_ops *i2c_bitbang_ops_t;
56
57 int i2c_bitbang_send_start(void *, int, i2c_bitbang_ops_t);
58 int i2c_bitbang_send_stop(void *, int, i2c_bitbang_ops_t);
59 int i2c_bitbang_initiate_xfer(void *, i2c_addr_t, int, i2c_bitbang_ops_t);
60 int i2c_bitbang_read_byte(void *, uint8_t *, int, i2c_bitbang_ops_t);
61 int i2c_bitbang_write_byte(void *, uint8_t, int, i2c_bitbang_ops_t);
62
63 #endif /* _DEV_I2C_I2C_BITBANG_H_ */