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 1.8 1999/02/13 17:57:19 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 char *smbd_desc; /* device descriptor */ 50 }; 51 52 /* 53 * list of known devices 54 */ 55 struct smbus_device smbus_children[] = { 56 { "smb", "SMBus general purpose I/O" }, 57 { NULL, 0 } 58 }; 59 60 static devclass_t smbus_devclass; 61 62 /* 63 * Device methods 64 */ 65 static int smbus_probe(device_t); 66 static int smbus_attach(device_t); 67 static void smbus_print_child(device_t, device_t); 68 69 #if 0 70 static int smbus_read_ivar(device_t , device_t, int, u_long *); 71 #endif 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, bus_generic_read_ivar), 83 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar), 84 85 { 0, 0 } 86 }; 87 88 static driver_t smbus_driver = { 89 "smbus", 90 smbus_methods, 91 sizeof(struct smbus_softc), 92 }; 93 94 /* 95 * At 'probe' time, we add all the devices which we know about to the 96 * bus. The generic attach routine will probe and attach them if they 97 * are alive. 98 */ 99 static int 100 smbus_probe(device_t dev) 101 { 102 device_set_desc(dev, "System Management Bus"); 103 104 return (0); 105 } 106 107 static int 108 smbus_attach(device_t dev) 109 { 110 struct smbus_device *smbdev; 111 112 /* add known devices */ 113 for (smbdev = smbus_children; smbdev->smbd_name; smbdev++) { 114 device_t child; 115 116 if (devclass_find(smbdev->smbd_name)) { 117 child = device_add_child(dev, smbdev->smbd_name, 118 -1, smbdev); 119 device_set_desc(child, smbdev->smbd_desc); 120 } else if (bootverbose) 121 printf("smbus: %s devclass not found\n", 122 smbdev->smbd_name); 123 } 124 bus_generic_attach(dev); 125 126 return (0); 127 } 128 129 void 130 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high) 131 { 132 return; 133 } 134 135 static void 136 smbus_print_child(device_t bus, device_t dev) 137 { 138 139 printf(" on %s%d", device_get_name(bus), device_get_unit(bus)); 140 141 return; 142 } 143 144 #if 0 145 static int 146 smbus_read_ivar(device_t bus, device_t dev, int index, u_long* result) 147 { 148 struct smbus_device* smbdev = DEVTOSMBUS(dev); 149 150 switch (index) { 151 default: 152 break; 153 } 154 return (ENOENT); 155 } 156 #endif 157 158 DRIVER_MODULE(smbus, iicsmb, smbus_driver, smbus_devclass, 0, 0); 159 DRIVER_MODULE(smbus, bti2c, smbus_driver, smbus_devclass, 0, 0); 160 DRIVER_MODULE(smbus, intsmb, smbus_driver, smbus_devclass, 0, 0); 161 DRIVER_MODULE(smbus, alsmb, smbus_driver, smbus_devclass, 0, 0); 162