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: src/sys/dev/smbus/smbus.c,v 1.18.10.4 2006/09/26 18:44:56 jhb 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 "smbconf.h" 36 #include "smbus.h" 37 #include "smbus_if.h" 38 #include "bus_if.h" 39 40 /* 41 * Autoconfiguration and support routines for System Management bus 42 */ 43 44 /* 45 * Device methods 46 */ 47 static int smbus_probe(device_t); 48 static int smbus_attach(device_t); 49 static int smbus_detach(device_t); 50 51 static device_t smbus_add_child(device_t bus, device_t parent, int order, 52 const char *name, int unit); 53 static void smbus_probe_device(device_t dev, u_char addr); 54 55 static device_method_t smbus_methods[] = { 56 /* device interface */ 57 DEVMETHOD(device_probe, smbus_probe), 58 DEVMETHOD(device_attach, smbus_attach), 59 DEVMETHOD(device_detach, smbus_detach), 60 61 /* bus interface */ 62 DEVMETHOD(bus_add_child, smbus_add_child), 63 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 64 DEVMETHOD(bus_print_child, bus_generic_print_child), 65 66 DEVMETHOD_END 67 }; 68 69 driver_t smbus_driver = { 70 "smbus", 71 smbus_methods, 72 sizeof(struct smbus_softc), 73 }; 74 75 devclass_t smbus_devclass; 76 77 /* 78 * At 'probe' time, we add all the devices which we know about to the 79 * bus. The generic attach routine will probe and attach them if they 80 * are alive. 81 */ 82 static int 83 smbus_probe(device_t dev) 84 { 85 device_set_desc(dev, "System Management Bus"); 86 87 return (0); 88 } 89 90 static int 91 smbus_attach(device_t dev) 92 { 93 unsigned char addr; 94 95 device_add_child(dev, NULL, device_get_unit(dev)); 96 for (addr = 16; addr < 112; ++addr) { 97 smbus_probe_device(dev, addr); 98 } 99 100 /*bus_generic_probe(dev);*/ 101 bus_generic_attach(dev); 102 103 return (0); 104 } 105 106 static int 107 smbus_detach(device_t dev) 108 { 109 int error; 110 111 error = bus_generic_detach(dev); 112 if (error) 113 return (error); 114 115 return (0); 116 } 117 118 void 119 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high) 120 { 121 } 122 123 static void 124 smbus_probe_device(device_t dev, u_char addr) 125 { 126 int error; 127 u_char cmd; 128 u_char buf[2]; 129 130 cmd = 0x01; 131 132 error = smbus_trans(dev, addr, cmd, 133 SMB_TRANS_NOCNT | SMB_TRANS_NOREPORT, 134 NULL, 0, buf, 1, NULL); 135 if (error == 0) { 136 device_printf(dev, "Probed address 0x%02x\n", addr); 137 /* device_add_child / specific */ 138 device_add_child(dev, NULL, 139 (device_get_unit(dev) << 11) | 0x0400 | addr); 140 } 141 } 142 143 static device_t 144 smbus_add_child(device_t bus, device_t parent, int order, 145 const char *name, int unit) 146 { 147 device_t child; 148 149 kprintf("smbus_add_child unit %d\n", unit); 150 child = device_add_child_ordered(parent, order, name, unit); 151 device_probe_and_attach(child); 152 153 return child; 154 } 155 156 157 MODULE_VERSION(smbus, SMBUS_MODVER); 158