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_identify_children(dev); 71 bus_enumerate_hinted_children(dev); 72 bus_attach_children(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_child_deleted(device_t dev, device_t child) 117 { 118 free(device_get_ivars(child), M_DEVBUF); 119 } 120 121 static void 122 smbus_hinted_child(device_t bus, const char *dname, int dunit) 123 { 124 struct smbus_ivar *devi; 125 device_t child; 126 int addr; 127 128 addr = 0; 129 resource_int_value(dname, dunit, "addr", &addr); 130 if (addr > UINT8_MAX) { 131 device_printf(bus, "ignored incorrect slave address hint 0x%x" 132 " for %s%d\n", addr, dname, dunit); 133 return; 134 } 135 child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit); 136 if (child == NULL) 137 return; 138 devi = device_get_ivars(child); 139 devi->addr = addr; 140 } 141 142 static int 143 smbus_child_location(device_t parent, device_t child, struct sbuf *sb) 144 { 145 struct smbus_ivar *devi; 146 147 devi = device_get_ivars(child); 148 if (devi->addr != 0) 149 sbuf_printf(sb, "addr=0x%x", devi->addr); 150 return (0); 151 } 152 153 static int 154 smbus_print_child(device_t parent, device_t child) 155 { 156 struct smbus_ivar *devi; 157 int retval; 158 159 devi = device_get_ivars(child); 160 retval = bus_print_child_header(parent, child); 161 if (devi->addr != 0) 162 retval += printf(" at addr 0x%x", devi->addr); 163 retval += bus_print_child_footer(parent, child); 164 165 return (retval); 166 } 167 168 static int 169 smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result) 170 { 171 struct smbus_ivar *devi; 172 173 devi = device_get_ivars(child); 174 switch (which) { 175 case SMBUS_IVAR_ADDR: 176 if (devi->addr != 0) 177 *result = devi->addr; 178 else 179 *result = -1; 180 break; 181 default: 182 return (ENOENT); 183 } 184 return (0); 185 } 186 187 static int 188 smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value) 189 { 190 struct smbus_ivar *devi; 191 192 devi = device_get_ivars(child); 193 switch (which) { 194 case SMBUS_IVAR_ADDR: 195 /* Allow to set but no change the slave address. */ 196 if (devi->addr != 0) 197 return (EINVAL); 198 devi->addr = value; 199 break; 200 default: 201 return (ENOENT); 202 } 203 return (0); 204 } 205 206 static void 207 smbus_probe_nomatch(device_t bus, device_t child) 208 { 209 struct smbus_ivar *devi = device_get_ivars(child); 210 211 /* 212 * Ignore (self-identified) devices without a slave address set. 213 * For example, smb(4). 214 */ 215 if (devi->addr != 0) 216 device_printf(bus, "<unknown device> at addr %#x\n", 217 devi->addr); 218 } 219 220 /* 221 * Device methods 222 */ 223 static device_method_t smbus_methods[] = { 224 /* device interface */ 225 DEVMETHOD(device_probe, smbus_probe), 226 DEVMETHOD(device_attach, smbus_attach), 227 DEVMETHOD(device_detach, smbus_detach), 228 229 /* bus interface */ 230 DEVMETHOD(bus_add_child, smbus_add_child), 231 DEVMETHOD(bus_child_deleted, smbus_child_deleted), 232 DEVMETHOD(bus_hinted_child, smbus_hinted_child), 233 DEVMETHOD(bus_probe_nomatch, smbus_probe_nomatch), 234 DEVMETHOD(bus_child_location, smbus_child_location), 235 DEVMETHOD(bus_print_child, smbus_print_child), 236 DEVMETHOD(bus_read_ivar, smbus_read_ivar), 237 DEVMETHOD(bus_write_ivar, smbus_write_ivar), 238 239 DEVMETHOD_END 240 }; 241 242 driver_t smbus_driver = { 243 "smbus", 244 smbus_methods, 245 sizeof(struct smbus_softc), 246 }; 247 248 MODULE_VERSION(smbus, SMBUS_MODVER); 249