1/*- 2 * Copyright (c) 1998, 2001 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#include <sys/cdefs.h>
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28__FBSDID("$FreeBSD: head/sys/dev/iicbus/iicbus.c 157827 2006-04-17 22:33:42Z jmg $");
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28__FBSDID("$FreeBSD: head/sys/dev/iicbus/iicbus.c 160372 2006-07-14 23:15:06Z imp $"); |
29 30/* 31 * Autoconfiguration and support routines for the Philips serial I2C bus 32 */ 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/kernel.h> 37#include <sys/module.h> 38#include <sys/bus.h> 39 40 41#include <dev/iicbus/iiconf.h> 42#include <dev/iicbus/iicbus.h> 43 44#include "iicbus_if.h" 45 46#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev)) 47
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48static devclass_t iicbus_devclass;
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48devclass_t iicbus_devclass; |
49 50/* See comments below for why auto-scanning is a bad idea. */ 51#define SCAN_IICBUS 0 52 53/* 54 * Device methods 55 */ 56static int iicbus_probe(device_t); 57static int iicbus_attach(device_t); 58static int iicbus_detach(device_t); 59static int iicbus_add_child(device_t dev, int order, const char *name, int unit); 60 61static device_method_t iicbus_methods[] = { 62 /* device interface */ 63 DEVMETHOD(device_probe, iicbus_probe), 64 DEVMETHOD(device_attach, iicbus_attach), 65 DEVMETHOD(device_detach, iicbus_detach), 66 67 /* bus interface */ 68 DEVMETHOD(bus_add_child, iicbus_add_child), 69 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 70 DEVMETHOD(bus_print_child, bus_generic_print_child), 71 72 { 0, 0 } 73}; 74
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75static driver_t iicbus_driver = {
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75driver_t iicbus_driver = { |
76 "iicbus", 77 iicbus_methods, 78 sizeof(struct iicbus_softc), 79}; 80 81static int 82iicbus_probe(device_t dev) 83{
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84 device_set_desc(dev, "Philips I2C bus");
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84
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85 device_set_desc(dev, "Philips I2C bus"); |
86 return (0); 87} 88 89#if SCAN_IICBUS 90static int 91iic_probe_device(device_t dev, u_char addr) 92{ 93 int count; 94 char byte; 95 96 if ((addr & 1) == 0) { 97 /* is device writable? */ 98 if (!iicbus_start(dev, (u_char)addr, 0)) { 99 iicbus_stop(dev); 100 return (1); 101 } 102 } else { 103 /* is device readable? */ 104 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count)) 105 return (1); 106 } 107 108 return (0); 109} 110#endif 111 112/* 113 * We add all the devices which we know about. 114 * The generic attach routine will attach them if they are alive. 115 */ 116static int 117iicbus_attach(device_t dev) 118{ 119#if SCAN_IICBUS 120 unsigned char addr; 121#endif 122 123 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 124 125 /* device probing is meaningless since the bus is supposed to be 126 * hot-plug. Moreover, some I2C chips do not appreciate random 127 * accesses like stop after start to fast, reads for less than 128 * x bytes... 129 */ 130#if SCAN_IICBUS 131 printf("Probing for devices on iicbus%d:", device_get_unit(dev)); 132 133 /* probe any devices */ 134 for (addr = 16; addr < 240; addr++) { 135 if (iic_probe_device(dev, (u_char)addr)) { 136 printf(" <%x>", addr); 137 } 138 } 139 printf("\n"); 140#endif 141
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142 /* attach any known device */
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142 device_add_child(dev, "ic", -1);
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144 device_add_child(dev, "iic", -1);
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143 device_add_child(dev, "iicsmb", -1);
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146
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144#if 0 145 /* attach any known device */ 146 device_add_child(dev, "iic", -1); 147#endif |
148 bus_generic_attach(dev);
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148
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149 return (0); 150} 151 152static int 153iicbus_detach(device_t dev) 154{
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155 |
156 iicbus_reset(dev, IIC_FASTEST, 0, NULL);
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156
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157 bus_generic_detach(dev);
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158
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158 return (0); 159} 160 161static int 162iicbus_add_child(device_t dev, int order, const char *name, int unit) 163{
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165 device_add_child_ordered(dev, order, name, unit);
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164
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165 device_add_child_ordered(dev, order, name, unit); |
166 bus_generic_attach(dev);
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168
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167 return (0); 168} 169 170int 171iicbus_generic_intr(device_t dev, int event, char *buf) 172{
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173 |
174 return (0); 175} 176 177int 178iicbus_null_callback(device_t dev, int index, caddr_t data) 179{
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180 |
181 return (0); 182} 183 184int 185iicbus_null_repeated_start(device_t dev, u_char addr) 186{
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187 |
188 return (IIC_ENOTSUPP); 189} 190 191DRIVER_MODULE(iicbus, envctrl, iicbus_driver, iicbus_devclass, 0, 0); 192DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0); 193MODULE_VERSION(iicbus, IICBUS_MODVER);
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