1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/sbuf.h> 41 42 #include <dev/smbus/smbconf.h> 43 #include <dev/smbus/smbus.h> 44 45 #include "smbus_if.h" 46 #include "bus_if.h" 47 48 struct smbus_ivar 49 { 50 uint8_t addr; 51 }; 52 53 /* 54 * Autoconfiguration and support routines for System Management bus 55 */ 56 57 static int 58 smbus_probe(device_t dev) 59 { 60 61 device_set_desc(dev, "System Management Bus"); 62 63 return (0); 64 } 65 66 static int 67 smbus_attach(device_t dev) 68 { 69 struct smbus_softc *sc = device_get_softc(dev); 70 71 mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF); 72 bus_generic_probe(dev); 73 bus_enumerate_hinted_children(dev); 74 bus_generic_attach(dev); 75 76 return (0); 77 } 78 79 static int 80 smbus_detach(device_t dev) 81 { 82 struct smbus_softc *sc = device_get_softc(dev); 83 int error; 84 85 error = bus_generic_detach(dev); 86 if (error) 87 return (error); 88 device_delete_children(dev); 89 mtx_destroy(&sc->lock); 90 91 return (0); 92 } 93 94 void 95 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err) 96 { 97 } 98 99 static device_t 100 smbus_add_child(device_t dev, u_int order, const char *name, int unit) 101 { 102 struct smbus_ivar *devi; 103 device_t child; 104 105 child = device_add_child_ordered(dev, order, name, unit); 106 if (child == NULL) 107 return (child); 108 devi = malloc(sizeof(struct smbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); 109 if (devi == NULL) { 110 device_delete_child(dev, child); 111 return (NULL); 112 } 113 device_set_ivars(child, devi); 114 return (child); 115 } 116 117 static void 118 smbus_hinted_child(device_t bus, const char *dname, int dunit) 119 { 120 struct smbus_ivar *devi; 121 device_t child; 122 int addr; 123 124 addr = 0; 125 resource_int_value(dname, dunit, "addr", &addr); 126 if (addr > UINT8_MAX) { 127 device_printf(bus, "ignored incorrect slave address hint 0x%x" 128 " for %s%d\n", addr, dname, dunit); 129 return; 130 } 131 child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit); 132 if (child == NULL) 133 return; 134 devi = device_get_ivars(child); 135 devi->addr = addr; 136 } 137 138 static int 139 smbus_child_location(device_t parent, device_t child, struct sbuf *sb) 140 { 141 struct smbus_ivar *devi; 142 143 devi = device_get_ivars(child); 144 if (devi->addr != 0) 145 sbuf_printf(sb, "addr=0x%x", devi->addr); 146 return (0); 147 } 148 149 static int 150 smbus_print_child(device_t parent, device_t child) 151 { 152 struct smbus_ivar *devi; 153 int retval; 154 155 devi = device_get_ivars(child); 156 retval = bus_print_child_header(parent, child); 157 if (devi->addr != 0) 158 retval += printf(" at addr 0x%x", devi->addr); 159 retval += bus_print_child_footer(parent, child); 160 161 return (retval); 162 } 163 164 static int 165 smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result) 166 { 167 struct smbus_ivar *devi; 168 169 devi = device_get_ivars(child); 170 switch (which) { 171 case SMBUS_IVAR_ADDR: 172 if (devi->addr != 0) 173 *result = devi->addr; 174 else 175 *result = -1; 176 break; 177 default: 178 return (ENOENT); 179 } 180 return (0); 181 } 182 183 static int 184 smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value) 185 { 186 struct smbus_ivar *devi; 187 188 devi = device_get_ivars(child); 189 switch (which) { 190 case SMBUS_IVAR_ADDR: 191 /* Allow to set but no change the slave address. */ 192 if (devi->addr != 0) 193 return (EINVAL); 194 devi->addr = value; 195 break; 196 default: 197 return (ENOENT); 198 } 199 return (0); 200 } 201 202 static void 203 smbus_probe_nomatch(device_t bus, device_t child) 204 { 205 struct smbus_ivar *devi = device_get_ivars(child); 206 207 /* 208 * Ignore (self-identified) devices without a slave address set. 209 * For example, smb(4). 210 */ 211 if (devi->addr != 0) 212 device_printf(bus, "<unknown device> at addr %#x\n", 213 devi->addr); 214 } 215 216 /* 217 * Device methods 218 */ 219 static device_method_t smbus_methods[] = { 220 /* device interface */ 221 DEVMETHOD(device_probe, smbus_probe), 222 DEVMETHOD(device_attach, smbus_attach), 223 DEVMETHOD(device_detach, smbus_detach), 224 225 /* bus interface */ 226 DEVMETHOD(bus_add_child, smbus_add_child), 227 DEVMETHOD(bus_hinted_child, smbus_hinted_child), 228 DEVMETHOD(bus_probe_nomatch, smbus_probe_nomatch), 229 DEVMETHOD(bus_child_location, smbus_child_location), 230 DEVMETHOD(bus_print_child, smbus_print_child), 231 DEVMETHOD(bus_read_ivar, smbus_read_ivar), 232 DEVMETHOD(bus_write_ivar, smbus_write_ivar), 233 234 DEVMETHOD_END 235 }; 236 237 driver_t smbus_driver = { 238 "smbus", 239 smbus_methods, 240 sizeof(struct smbus_softc), 241 }; 242 243 MODULE_VERSION(smbus, SMBUS_MODVER); 244