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# 27 28#include <sys/bus.h> 29#include <dev/iicbus/iic.h> 30 31INTERFACE iicbus; 32 33CODE { 34 static int iicbus_nosupport(void) 35 { 36 37 return (ENODEV); 38 } 39 40 static u_int 41 iicbus_default_frequency(device_t bus, u_char speed) 42 { 43 44 return (100000); 45 } 46}; 47 48# 49# Interpret interrupt 50# 51METHOD int intr { 52 device_t dev; 53 int event; 54 char *buf; 55}; 56 57# 58# iicbus callback 59# Request ownership of bus 60# index: IIC_REQUEST_BUS or IIC_RELEASE_BUS 61# data: pointer to int containing IIC_WAIT or IIC_DONTWAIT and either IIC_INTR or IIC_NOINTR 62# This function is allowed to sleep if *data contains IIC_WAIT. 63# 64METHOD int callback { 65 device_t dev; 66 int index; 67 caddr_t data; 68}; 69 70# 71# Send REPEATED_START condition 72# 73METHOD int repeated_start { 74 device_t dev; 75 u_char slave; 76 int timeout; 77} DEFAULT iicbus_nosupport; 78 79# 80# Send START condition 81# 82METHOD int start { 83 device_t dev; 84 u_char slave; 85 int timeout; 86} DEFAULT iicbus_nosupport; 87 88# 89# Send STOP condition 90# 91METHOD int stop { 92 device_t dev; 93} DEFAULT iicbus_nosupport; 94 95# 96# Read from I2C bus 97# 98METHOD int read { 99 device_t dev; 100 char *buf; 101 int len; 102 int *bytes; 103 int last; 104 int delay; 105} DEFAULT iicbus_nosupport; 106 107# 108# Write to the I2C bus 109# 110METHOD int write { 111 device_t dev; 112 const char *buf; 113 int len; 114 int *bytes; 115 int timeout; 116} DEFAULT iicbus_nosupport; 117 118# 119# Reset I2C bus 120# 121METHOD int reset { 122 device_t dev; 123 u_char speed; 124 u_char addr; 125 u_char *oldaddr; 126}; 127 128# 129# Generalized Read/Write interface 130# 131METHOD int transfer { 132 device_t dev; 133 struct iic_msg *msgs; 134 uint32_t nmsgs; 135}; 136 137# 138# Return the frequency in Hz for the bus running at the given 139# symbolic speed. Only the IIC_SLOW speed has meaning, it is always 140# 100KHz. The UNKNOWN, FAST, and FASTEST rates all map to the 141# configured bus frequency, or 100KHz when not otherwise configured. 142# 143METHOD u_int get_frequency { 144 device_t dev; 145 u_char speed; 146} DEFAULT iicbus_default_frequency; 147