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_ */ 64