1#- 2# Copyright (c) 1998 Nicolas Souchu 3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions 7# are met: 8# 1. Redistributions of source code must retain the above copyright 9# notice, this list of conditions and the following disclaimer. 10# 2. Redistributions in binary form must reproduce the above copyright 11# notice, this list of conditions and the following disclaimer in the 12# documentation and/or other materials provided with the distribution. 13# 14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24# SUCH DAMAGE. 25# 26# $FreeBSD$ 27# 28 29#include <sys/bus.h> 30#include <dev/iicbus/iic.h> 31 32INTERFACE iicbus; 33 34CODE { 35 static int iicbus_nosupport(void) 36 { 37 38 return (ENODEV); 39 } 40 41 static u_int 42 iicbus_default_frequency(device_t bus, u_char speed) 43 { 44 45 return (100000); 46 } 47}; 48 49# 50# Interpret interrupt 51# 52METHOD int intr { 53 device_t dev; 54 int event; 55 char *buf; 56}; 57 58# 59# iicbus callback 60# Request ownership of bus 61# index: IIC_REQUEST_BUS or IIC_RELEASE_BUS 62# data: pointer to int containing IIC_WAIT or IIC_DONTWAIT and either IIC_INTR or IIC_NOINTR 63# This function is allowed to sleep if *data contains IIC_WAIT. 64# 65METHOD int callback { 66 device_t dev; 67 int index; 68 caddr_t data; 69}; 70 71# 72# Send REPEATED_START condition 73# 74METHOD int repeated_start { 75 device_t dev; 76 u_char slave; 77 int timeout; 78} DEFAULT iicbus_nosupport; 79 80# 81# Send START condition 82# 83METHOD int start { 84 device_t dev; 85 u_char slave; 86 int timeout; 87} DEFAULT iicbus_nosupport; 88 89# 90# Send STOP condition 91# 92METHOD int stop { 93 device_t dev; 94} DEFAULT iicbus_nosupport; 95 96# 97# Read from I2C bus 98# 99METHOD int read { 100 device_t dev; 101 char *buf; 102 int len; 103 int *bytes; 104 int last; 105 int delay; 106} DEFAULT iicbus_nosupport; 107 108# 109# Write to the I2C bus 110# 111METHOD int write { 112 device_t dev; 113 const char *buf; 114 int len; 115 int *bytes; 116 int timeout; 117} DEFAULT iicbus_nosupport; 118 119# 120# Reset I2C bus 121# 122METHOD int reset { 123 device_t dev; 124 u_char speed; 125 u_char addr; 126 u_char *oldaddr; 127}; 128 129# 130# Generalized Read/Write interface 131# 132METHOD int transfer { 133 device_t dev; 134 struct iic_msg *msgs; 135 uint32_t nmsgs; 136}; 137 138# 139# Return the frequency in Hz for the bus running at the given 140# symbolic speed. Only the IIC_SLOW speed has meaning, it is always 141# 100KHz. The UNKNOWN, FAST, and FASTEST rates all map to the 142# configured bus frequency, or 100KHz when not otherwise configured. 143# 144METHOD u_int get_frequency { 145 device_t dev; 146 u_char speed; 147} DEFAULT iicbus_default_frequency; 148