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