Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/i2c/i2c_bitbang.h
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1 /* $NetBSD: i2c_bitbang.h,v 1.1 2003/09/30 00:35:31 thorpej 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_ */
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