1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1998, 2001 Nicolas Souchu 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 #include <sys/mutex.h> 38 #include <sys/sbuf.h> 39 40 #include <dev/smbus/smbconf.h> 41 #include <dev/smbus/smbus.h> 42 43 #include "smbus_if.h" 44 #include "bus_if.h" 45 46 struct smbus_ivar 47 { 48 uint8_t addr; 49 }; 50 51 /* 52 * Autoconfiguration and support routines for System Management bus 53 */ 54 55 static int 56 smbus_probe(device_t dev) 57 { 58 59 device_set_desc(dev, "System Management Bus"); 60 61 return (0); 62 } 63 64 static int 65 smbus_attach(device_t dev) 66 { 67 struct smbus_softc *sc = device_get_softc(dev); 68 69 mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF); 70 bus_generic_probe(dev); 71 bus_enumerate_hinted_children(dev); 72 bus_generic_attach(dev); 73 74 return (0); 75 } 76 77 static int 78 smbus_detach(device_t dev) 79 { 80 struct smbus_softc *sc = device_get_softc(dev); 81 int error; 82 83 error = bus_generic_detach(dev); 84 if (error) 85 return (error); 86 device_delete_children(dev); 87 mtx_destroy(&sc->lock); 88 89 return (0); 90 } 91 92 void 93 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err) 94 { 95 } 96 97 static device_t 98 smbus_add_child(device_t dev, u_int order, const char *name, int unit) 99 { 100 struct smbus_ivar *devi; 101 device_t child; 102 103 child = device_add_child_ordered(dev, order, name, unit); 104 if (child == NULL) 105 return (child); 106 devi = malloc(sizeof(struct smbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); 107 if (devi == NULL) { 108 device_delete_child(dev, child); 109 return (NULL); 110 } 111 device_set_ivars(child, devi); 112 return (child); 113 } 114 115 static void 116 smbus_hinted_child(device_t bus, const char *dname, int dunit) 117 { 118 struct smbus_ivar *devi; 119 device_t child; 120 int addr; 121 122 addr = 0; 123 resource_int_value(dname, dunit, "addr", &addr); 124 if (addr > UINT8_MAX) { 125 device_printf(bus, "ignored incorrect slave address hint 0x%x" 126 " for %s%d\n", addr, dname, dunit); 127 return; 128 } 129 child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit); 130 if (child == NULL) 131 return; 132 devi = device_get_ivars(child); 133 devi->addr = addr; 134 } 135 136 static int 137 smbus_child_location(device_t parent, device_t child, struct sbuf *sb) 138 { 139 struct smbus_ivar *devi; 140 141 devi = device_get_ivars(child); 142 if (devi->addr != 0) 143 sbuf_printf(sb, "addr=0x%x", devi->addr); 144 return (0); 145 } 146 147 static int 148 smbus_print_child(device_t parent, device_t child) 149 { 150 struct smbus_ivar *devi; 151 int retval; 152 153 devi = device_get_ivars(child); 154 retval = bus_print_child_header(parent, child); 155 if (devi->addr != 0) 156 retval += printf(" at addr 0x%x", devi->addr); 157 retval += bus_print_child_footer(parent, child); 158 159 return (retval); 160 } 161 162 static int 163 smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result) 164 { 165 struct smbus_ivar *devi; 166 167 devi = device_get_ivars(child); 168 switch (which) { 169 case SMBUS_IVAR_ADDR: 170 if (devi->addr != 0) 171 *result = devi->addr; 172 else 173 *result = -1; 174 break; 175 default: 176 return (ENOENT); 177 } 178 return (0); 179 } 180 181 static int 182 smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value) 183 { 184 struct smbus_ivar *devi; 185 186 devi = device_get_ivars(child); 187 switch (which) { 188 case SMBUS_IVAR_ADDR: 189 /* Allow to set but no change the slave address. */ 190 if (devi->addr != 0) 191 return (EINVAL); 192 devi->addr = value; 193 break; 194 default: 195 return (ENOENT); 196 } 197 return (0); 198 } 199 200 static void 201 smbus_probe_nomatch(device_t bus, device_t child) 202 { 203 struct smbus_ivar *devi = device_get_ivars(child); 204 205 /* 206 * Ignore (self-identified) devices without a slave address set. 207 * For example, smb(4). 208 */ 209 if (devi->addr != 0) 210 device_printf(bus, "<unknown device> at addr %#x\n", 211 devi->addr); 212 } 213 214 /* 215 * Device methods 216 */ 217 static device_method_t smbus_methods[] = { 218 /* device interface */ 219 DEVMETHOD(device_probe, smbus_probe), 220 DEVMETHOD(device_attach, smbus_attach), 221 DEVMETHOD(device_detach, smbus_detach), 222 223 /* bus interface */ 224 DEVMETHOD(bus_add_child, smbus_add_child), 225 DEVMETHOD(bus_hinted_child, smbus_hinted_child), 226 DEVMETHOD(bus_probe_nomatch, smbus_probe_nomatch), 227 DEVMETHOD(bus_child_location, smbus_child_location), 228 DEVMETHOD(bus_print_child, smbus_print_child), 229 DEVMETHOD(bus_read_ivar, smbus_read_ivar), 230 DEVMETHOD(bus_write_ivar, smbus_write_ivar), 231 232 DEVMETHOD_END 233 }; 234 235 driver_t smbus_driver = { 236 "smbus", 237 smbus_methods, 238 sizeof(struct smbus_softc), 239 }; 240 241 MODULE_VERSION(smbus, SMBUS_MODVER); 242