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 | |