| 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 | |