2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1998, 2001 Nicolas Souchu
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
41 #include <dev/smbus/smbconf.h>
42 #include <dev/smbus/smbus.h>
53 * Autoconfiguration and support routines for System Management bus
57 smbus_probe(device_t dev)
60 device_set_desc(dev, "System Management Bus");
66 smbus_attach(device_t dev)
68 struct smbus_softc *sc = device_get_softc(dev);
70 mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF);
71 bus_generic_probe(dev);
72 bus_enumerate_hinted_children(dev);
73 bus_generic_attach(dev);
79 smbus_detach(device_t dev)
81 struct smbus_softc *sc = device_get_softc(dev);
84 error = bus_generic_detach(dev);
87 device_delete_children(dev);
88 mtx_destroy(&sc->lock);
94 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err)
99 smbus_add_child(device_t dev, u_int order, const char *name, int unit)
101 struct smbus_ivar *devi;
104 child = device_add_child_ordered(dev, order, name, unit);
107 devi = malloc(sizeof(struct smbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
109 device_delete_child(dev, child);
112 device_set_ivars(child, devi);
117 smbus_hinted_child(device_t bus, const char *dname, int dunit)
119 struct smbus_ivar *devi;
124 resource_int_value(dname, dunit, "addr", &addr);
125 if (addr > UINT8_MAX) {
126 device_printf(bus, "ignored incorrect slave address hint 0x%x"
127 " for %s%d\n", addr, dname, dunit);
130 child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit);
133 devi = device_get_ivars(child);
138 smbus_child_location_str(device_t parent, device_t child, char *buf,
141 struct smbus_ivar *devi;
143 devi = device_get_ivars(child);
145 snprintf(buf, buflen, "addr=0x%x", devi->addr);
152 smbus_print_child(device_t parent, device_t child)
154 struct smbus_ivar *devi;
157 devi = device_get_ivars(child);
158 retval = bus_print_child_header(parent, child);
160 retval += printf(" at addr 0x%x", devi->addr);
161 retval += bus_print_child_footer(parent, child);
167 smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result)
169 struct smbus_ivar *devi;
171 devi = device_get_ivars(child);
173 case SMBUS_IVAR_ADDR:
175 *result = devi->addr;
186 smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value)
188 struct smbus_ivar *devi;
190 devi = device_get_ivars(child);
192 case SMBUS_IVAR_ADDR:
193 /* Allow to set but no change the slave address. */
205 smbus_probe_nomatch(device_t bus, device_t child)
207 struct smbus_ivar *devi = device_get_ivars(child);
210 * Ignore (self-identified) devices without a slave address set.
211 * For example, smb(4).
214 device_printf(bus, "<unknown device> at addr %#x\n",
221 static device_method_t smbus_methods[] = {
222 /* device interface */
223 DEVMETHOD(device_probe, smbus_probe),
224 DEVMETHOD(device_attach, smbus_attach),
225 DEVMETHOD(device_detach, smbus_detach),
228 DEVMETHOD(bus_add_child, smbus_add_child),
229 DEVMETHOD(bus_hinted_child, smbus_hinted_child),
230 DEVMETHOD(bus_probe_nomatch, smbus_probe_nomatch),
231 DEVMETHOD(bus_child_location_str, smbus_child_location_str),
232 DEVMETHOD(bus_print_child, smbus_print_child),
233 DEVMETHOD(bus_read_ivar, smbus_read_ivar),
234 DEVMETHOD(bus_write_ivar, smbus_write_ivar),
239 driver_t smbus_driver = {
242 sizeof(struct smbus_softc),
245 devclass_t smbus_devclass;
247 MODULE_VERSION(smbus, SMBUS_MODVER);