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 1.1.1.2 1998/08/13 15:16:58 son 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 { "smb", 0, "General Call" }, 58 { NULL, 0 } 59 }; 60 61 static devclass_t smbus_devclass; 62 63 /* 64 * Device methods 65 */ 66 static int smbus_probe(device_t); 67 static int smbus_attach(device_t); 68 static void smbus_print_child(device_t, device_t); 69 static int smbus_read_ivar(device_t , device_t, int, u_long *); 70 71 static device_method_t smbus_methods[] = { 72 /* device interface */ 73 DEVMETHOD(device_probe, smbus_probe), 74 DEVMETHOD(device_attach, smbus_attach), 75 DEVMETHOD(device_detach, bus_generic_detach), 76 DEVMETHOD(device_shutdown, bus_generic_shutdown), 77 78 /* bus interface */ 79 DEVMETHOD(bus_print_child, smbus_print_child), 80 DEVMETHOD(bus_read_ivar, smbus_read_ivar), 81 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar), 82 DEVMETHOD(bus_create_intr, bus_generic_create_intr), 83 DEVMETHOD(bus_connect_intr, bus_generic_connect_intr), 84 85 { 0, 0 } 86 }; 87 88 static driver_t smbus_driver = { 89 "smbus", 90 smbus_methods, 91 DRIVER_TYPE_MISC, 92 sizeof(struct smbus_softc), 93 }; 94 95 /* 96 * At 'probe' time, we add all the devices which we know about to the 97 * bus. The generic attach routine will probe and attach them if they 98 * are alive. 99 */ 100 static int 101 smbus_probe(device_t dev) 102 { 103 struct smbus_device *smbdev; 104 device_t child; 105 106 for (smbdev = smbus_children; smbdev->smbd_name; smbdev++) { 107 108 child = device_add_child(dev, smbdev->smbd_name, -1, smbdev); 109 device_set_desc(child, smbdev->smbd_desc); 110 } 111 112 return (0); 113 } 114 115 static int 116 smbus_attach(device_t dev) 117 { 118 struct smbus_softc *sc = device_get_softc(dev); 119 device_t parent = device_get_parent(dev); 120 121 printf("Probing for devices on the SMB bus:\n"); 122 bus_generic_attach(dev); 123 124 return (0); 125 } 126 127 void 128 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high) 129 { 130 return; 131 } 132 133 static void 134 smbus_print_child(device_t bus, device_t dev) 135 { 136 struct smbus_device* smbdev = DEVTOSMBUS(dev); 137 138 printf(" on %s%d addr 0x%x", device_get_name(bus), 139 device_get_unit(bus), smbdev->smbd_addr); 140 141 return; 142 } 143 144 static int 145 smbus_read_ivar(device_t bus, device_t dev, int index, u_long* result) 146 { 147 struct smbus_device* smbdev = DEVTOSMBUS(dev); 148 149 switch (index) { 150 case SMBUS_IVAR_ADDR: 151 *result = smbdev->smbd_addr; 152 break; 153 } 154 return (ENOENT); 155 } 156 157 DRIVER_MODULE(smbus, iicsmb, smbus_driver, smbus_devclass, 0, 0); 158