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 * $FreeBSD$ 27 * 28 */ 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 48 static devclass_t iicbus_devclass; 49 50 /* 51 * Device methods 52 */ 53 static int iicbus_probe(device_t); 54 static int iicbus_attach(device_t); 55 static int iicbus_detach(device_t); 56 static int iicbus_add_child(device_t dev, int order, const char *name, int unit); 57 58 static device_method_t iicbus_methods[] = { 59 /* device interface */ 60 DEVMETHOD(device_probe, iicbus_probe), 61 DEVMETHOD(device_attach, iicbus_attach), 62 DEVMETHOD(device_detach, iicbus_detach), 63 64 /* bus interface */ 65 DEVMETHOD(bus_add_child, iicbus_add_child), 66 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 67 DEVMETHOD(bus_print_child, bus_generic_print_child), 68 69 { 0, 0 } 70 }; 71 72 static driver_t iicbus_driver = { 73 "iicbus", 74 iicbus_methods, 75 sizeof(struct iicbus_softc), 76 }; 77 78 static int 79 iicbus_probe(device_t dev) 80 { 81 device_set_desc(dev, "Philips I2C bus"); 82 83 return (0); 84 } 85 86 #if 0 87 static int 88 iic_probe_device(device_t dev, u_char addr) 89 { 90 int count; 91 char byte; 92 93 if ((addr & 1) == 0) { 94 /* is device writable? */ 95 if (!iicbus_start(dev, (u_char)addr, 0)) { 96 iicbus_stop(dev); 97 return (1); 98 } 99 } else { 100 /* is device readable? */ 101 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count)) 102 return (1); 103 } 104 105 return (0); 106 } 107 #endif 108 109 /* 110 * We add all the devices which we know about. 111 * The generic attach routine will attach them if they are alive. 112 */ 113 static int 114 iicbus_attach(device_t dev) 115 { 116 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 117 118 /* device probing is meaningless since the bus is supposed to be 119 * hot-plug. Moreover, some I2C chips do not appreciate random 120 * accesses like stop after start to fast, reads for less than 121 * x bytes... 122 */ 123 #if 0 124 printf("Probing for devices on iicbus%d:", device_get_unit(dev)); 125 126 /* probe any devices */ 127 for (addr = FIRST_SLAVE_ADDR; addr <= LAST_SLAVE_ADDR; addr++) { 128 if (iic_probe_device(dev, (u_char)addr)) { 129 printf(" <%x>", addr); 130 } 131 } 132 printf("\n"); 133 #endif 134 135 /* attach any known device */ 136 device_add_child(dev, NULL, -1); 137 138 bus_generic_attach(dev); 139 140 return (0); 141 } 142 143 static int 144 iicbus_detach(device_t dev) 145 { 146 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 147 148 bus_generic_detach(dev); 149 150 return (0); 151 } 152 153 static int 154 iicbus_add_child(device_t dev, int order, const char *name, int unit) 155 { 156 device_add_child_ordered(dev, order, name, unit); 157 158 bus_generic_attach(dev); 159 160 return (0); 161 } 162 163 int 164 iicbus_generic_intr(device_t dev, int event, char *buf) 165 { 166 return (0); 167 } 168 169 int 170 iicbus_null_callback(device_t dev, int index, caddr_t data) 171 { 172 return (0); 173 } 174 175 int 176 iicbus_null_repeated_start(device_t dev, u_char addr) 177 { 178 return (IIC_ENOTSUPP); 179 } 180 181 DRIVER_MODULE(iicbus, pcf, iicbus_driver, iicbus_devclass, 0, 0); 182 DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0); 183 DRIVER_MODULE(iicbus, bti2c, iicbus_driver, iicbus_devclass, 0, 0); 184 MODULE_VERSION(iicbus, IICBUS_MODVER); 185