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 * $Id: smbus.c,v 1.1.1.1 1998/09/03 20:52:54 nsouch Exp $ 27 * 28 */ 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 #include <sys/bus.h> 34 35 #include <dev/smbus/smbconf.h> 36 #include <dev/smbus/smbus.h> 37 38 /* 39 * Autoconfiguration and support routines for the Philips serial I2C bus 40 */ 41 42 #define DEVTOSMBUS(dev) ((struct smbus_device*)device_get_ivars(dev)) 43 44 /* 45 * structure used to attach devices to the I2C bus 46 */ 47 struct smbus_device { 48 const char *smbd_name; /* device name */ 49 const u_char smbd_addr; /* address of the device */ 50 const char *smbd_desc; /* device descriptor */ 51 }; 52 53 /* 54 * list of known devices 55 */ 56 struct smbus_device smbus_children[] = { 57 #if 0 58 { "smb", 0, "General Call" }, 59 #endif 60 { NULL, 0 } 61 }; 62 63 static devclass_t smbus_devclass; 64 65 /* 66 * Device methods 67 */ 68 static int smbus_probe(device_t); 69 static int smbus_attach(device_t); 70 static void smbus_print_child(device_t, device_t); 71 static int smbus_read_ivar(device_t , device_t, int, u_long *); 72 73 static device_method_t smbus_methods[] = { 74 /* device interface */ 75 DEVMETHOD(device_probe, smbus_probe), 76 DEVMETHOD(device_attach, smbus_attach), 77 DEVMETHOD(device_detach, bus_generic_detach), 78 DEVMETHOD(device_shutdown, bus_generic_shutdown), 79 80 /* bus interface */ 81 DEVMETHOD(bus_print_child, smbus_print_child), 82 DEVMETHOD(bus_read_ivar, smbus_read_ivar), 83 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar), 84 DEVMETHOD(bus_create_intr, bus_generic_create_intr), 85 DEVMETHOD(bus_connect_intr, bus_generic_connect_intr), 86 87 { 0, 0 } 88 }; 89 90 static driver_t smbus_driver = { 91 "smbus", 92 smbus_methods, 93 DRIVER_TYPE_MISC, 94 sizeof(struct smbus_softc), 95 }; 96 97 /* 98 * At 'probe' time, we add all the devices which we know about to the 99 * bus. The generic attach routine will probe and attach them if they 100 * are alive. 101 */ 102 static int 103 smbus_probe(device_t dev) 104 { 105 device_set_desc(dev, "System Management Bus"); 106 return (0); 107 } 108 109 static int 110 smbus_attach(device_t dev) 111 { 112 struct smbus_device *smbdev; 113 device_t child; 114 char byte; 115 u_short addr; 116 117 bus_generic_attach(dev); 118 119 #if 0 120 printf("Probing for devices on smbus%d:\n", device_get_unit(dev)); 121 122 /* probe known devices */ 123 for (smbdev = smbus_children; smbdev->smbd_name; smbdev++) { 124 125 child = device_add_child(dev, smbdev->smbd_name, -1, smbdev); 126 device_set_desc(child, smbdev->smbd_desc); 127 } 128 #endif 129 130 return (0); 131 } 132 133 void 134 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high) 135 { 136 return; 137 } 138 139 static void 140 smbus_print_child(device_t bus, device_t dev) 141 { 142 struct smbus_device* smbdev = DEVTOSMBUS(dev); 143 144 printf(" on %s%d addr 0x%x", device_get_name(bus), 145 device_get_unit(bus), smbdev->smbd_addr); 146 147 return; 148 } 149 150 static int 151 smbus_read_ivar(device_t bus, device_t dev, int index, u_long* result) 152 { 153 struct smbus_device* smbdev = DEVTOSMBUS(dev); 154 155 switch (index) { 156 case SMBUS_IVAR_ADDR: 157 *result = smbdev->smbd_addr; 158 break; 159 } 160 return (ENOENT); 161 } 162 163 DRIVER_MODULE(smbus, iicsmb, smbus_driver, smbus_devclass, 0, 0); 164 DRIVER_MODULE(smbus, bti2c, smbus_driver, smbus_devclass, 0, 0); 165