sys/dev/i2c/i2c_bitbang.h

   1 /*      $NetBSD: i2c_bitbang.h,v 1.1.4.3 2004/09/21 13:27:46 skrll 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_ */