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 * 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/dev/smbus/smbus.c 308042 2016-10-28 15:02:24Z avg $"); 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/lock.h> 34#include <sys/malloc.h> 35#include <sys/module.h> 36#include <sys/mutex.h> 37#include <sys/bus.h> 38 39#include <dev/smbus/smbconf.h> 40#include <dev/smbus/smbus.h> 41 42 43struct smbus_ivar 44{ 45 uint8_t addr; 46}; 47 48/* 49 * Autoconfiguration and support routines for System Management bus 50 */ 51 52static int 53smbus_probe(device_t dev) 54{ 55 56 device_set_desc(dev, "System Management Bus"); 57 58 return (0); 59} 60 61static int 62smbus_attach(device_t dev) 63{ 64 struct smbus_softc *sc = device_get_softc(dev); 65 66 mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF); 67 bus_generic_probe(dev); 68 bus_enumerate_hinted_children(dev); 69 bus_generic_attach(dev); 70 71 return (0); 72} 73 74static int 75smbus_detach(device_t dev) 76{ 77 struct smbus_softc *sc = device_get_softc(dev); 78 int error; 79 80 error = bus_generic_detach(dev); 81 if (error) 82 return (error); 83 device_delete_children(dev); 84 mtx_destroy(&sc->lock); 85 86 return (0); 87} 88 89void 90smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err) 91{ 92} 93 94static device_t 95smbus_add_child(device_t dev, u_int order, const char *name, int unit) 96{ 97 struct smbus_ivar *devi; 98 device_t child; 99 100 child = device_add_child_ordered(dev, order, name, unit); 101 if (child == NULL) 102 return (child); 103 devi = malloc(sizeof(struct smbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); 104 if (devi == NULL) { 105 device_delete_child(dev, child); 106 return (NULL); 107 } 108 device_set_ivars(child, devi); 109 return (child); 110} 111 112static void 113smbus_hinted_child(device_t bus, const char *dname, int dunit) 114{ 115 struct smbus_ivar *devi; 116 device_t child; 117 int addr; 118 119 addr = 0; 120 resource_int_value(dname, dunit, "addr", &addr); 121 if (addr > UINT8_MAX) { 122 device_printf(bus, "ignored incorrect slave address hint 0x%x" 123 " for %s%d\n", addr, dname, dunit); 124 return; 125 } 126 child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit); 127 if (child == NULL) 128 return; 129 devi = device_get_ivars(child); 130 devi->addr = addr; 131} 132 133 134static int 135smbus_child_location_str(device_t parent, device_t child, char *buf, 136 size_t buflen) 137{ 138 struct smbus_ivar *devi; 139 140 devi = device_get_ivars(child); 141 if (devi->addr != 0) 142 snprintf(buf, buflen, "addr=0x%x", devi->addr); 143 else if (buflen) 144 buf[0] = 0; 145 return (0); 146} 147 148static int 149smbus_print_child(device_t parent, device_t child) 150{ 151 struct smbus_ivar *devi; 152 int retval; 153 154 devi = device_get_ivars(child); 155 retval = bus_print_child_header(parent, child); 156 if (devi->addr != 0) 157 retval += printf(" at addr 0x%x", devi->addr); 158 retval += bus_print_child_footer(parent, child); 159 160 return (retval); 161} 162 163static int 164smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result) 165{ 166 struct smbus_ivar *devi; 167 168 devi = device_get_ivars(child); 169 switch (which) { 170 case SMBUS_IVAR_ADDR: 171 if (devi->addr != 0) 172 *result = devi->addr; 173 else 174 *result = -1; 175 break; 176 default: 177 return (ENOENT); 178 } 179 return (0); 180} 181 182static int 183smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value) 184{ 185 struct smbus_ivar *devi; 186 187 devi = device_get_ivars(child); 188 switch (which) { 189 case SMBUS_IVAR_ADDR: 190 /* Allow to set but no change the slave address. */ 191 if (devi->addr != 0) 192 return (EINVAL); 193 devi->addr = value; 194 break; 195 default: 196 return (ENOENT); 197 } 198 return (0); 199} 200 201static void 202smbus_probe_nomatch(device_t bus, device_t child) 203{ 204 struct smbus_ivar *devi = device_get_ivars(child); 205 206 /* 207 * Ignore (self-identified) devices without a slave address set. 208 * For example, smb(4). 209 */ 210 if (devi->addr != 0) 211 device_printf(bus, "<unknown device> at addr %#x\n", 212 devi->addr); 213} 214 215/* 216 * Device methods 217 */ 218static device_method_t smbus_methods[] = { 219 /* device interface */ 220 DEVMETHOD(device_probe, smbus_probe), 221 DEVMETHOD(device_attach, smbus_attach), 222 DEVMETHOD(device_detach, smbus_detach), 223 224 /* bus interface */ 225 DEVMETHOD(bus_add_child, smbus_add_child), 226 DEVMETHOD(bus_hinted_child, smbus_hinted_child), 227 DEVMETHOD(bus_probe_nomatch, smbus_probe_nomatch), 228 DEVMETHOD(bus_child_location_str, smbus_child_location_str), 229 DEVMETHOD(bus_print_child, smbus_print_child), 230 DEVMETHOD(bus_read_ivar, smbus_read_ivar), 231 DEVMETHOD(bus_write_ivar, smbus_write_ivar), 232 233 DEVMETHOD_END 234}; 235 236driver_t smbus_driver = { 237 "smbus", 238 smbus_methods, 239 sizeof(struct smbus_softc), 240}; 241 242devclass_t smbus_devclass; 243 244MODULE_VERSION(smbus, SMBUS_MODVER); 245