2 * Copyright (c) 1998, 2001 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/module.h>
36 #include <sys/mutex.h>
39 #include <dev/smbus/smbconf.h>
40 #include <dev/smbus/smbus.h>
51 * Autoconfiguration and support routines for System Management bus
55 smbus_probe(device_t dev)
58 device_set_desc(dev, "System Management Bus");
64 smbus_attach(device_t dev)
66 struct smbus_softc *sc = device_get_softc(dev);
68 mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF);
69 bus_generic_probe(dev);
70 bus_enumerate_hinted_children(dev);
71 bus_generic_attach(dev);
77 smbus_detach(device_t dev)
79 struct smbus_softc *sc = device_get_softc(dev);
82 error = bus_generic_detach(dev);
85 device_delete_children(dev);
86 mtx_destroy(&sc->lock);
92 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err)
97 smbus_add_child(device_t dev, u_int order, const char *name, int unit)
99 struct smbus_ivar *devi;
102 child = device_add_child_ordered(dev, order, name, unit);
105 devi = malloc(sizeof(struct smbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
107 device_delete_child(dev, child);
110 device_set_ivars(child, devi);
115 smbus_hinted_child(device_t bus, const char *dname, int dunit)
117 struct smbus_ivar *devi;
122 resource_int_value(dname, dunit, "addr", &addr);
123 if (addr > UINT8_MAX) {
124 device_printf(bus, "ignored incorrect slave address hint 0x%x"
125 " for %s%d\n", addr, dname, dunit);
128 child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit);
131 devi = device_get_ivars(child);
137 smbus_child_location_str(device_t parent, device_t child, char *buf,
140 struct smbus_ivar *devi;
142 devi = device_get_ivars(child);
144 snprintf(buf, buflen, "addr=0x%x", devi->addr);
151 smbus_print_child(device_t parent, device_t child)
153 struct smbus_ivar *devi;
156 devi = device_get_ivars(child);
157 retval = bus_print_child_header(parent, child);
159 retval += printf(" at addr 0x%x", devi->addr);
160 retval += bus_print_child_footer(parent, child);
166 smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result)
168 struct smbus_ivar *devi;
170 devi = device_get_ivars(child);
172 case SMBUS_IVAR_ADDR:
174 *result = devi->addr;
185 smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value)
187 struct smbus_ivar *devi;
189 devi = device_get_ivars(child);
191 case SMBUS_IVAR_ADDR:
192 /* Allow to set but no change the slave address. */
204 smbus_probe_nomatch(device_t bus, device_t child)
206 struct smbus_ivar *devi = device_get_ivars(child);
209 * Ignore (self-identified) devices without a slave address set.
210 * For example, smb(4).
213 device_printf(bus, "<unknown device> at addr %#x\n",
220 static device_method_t smbus_methods[] = {
221 /* device interface */
222 DEVMETHOD(device_probe, smbus_probe),
223 DEVMETHOD(device_attach, smbus_attach),
224 DEVMETHOD(device_detach, smbus_detach),
227 DEVMETHOD(bus_add_child, smbus_add_child),
228 DEVMETHOD(bus_hinted_child, smbus_hinted_child),
229 DEVMETHOD(bus_probe_nomatch, smbus_probe_nomatch),
230 DEVMETHOD(bus_child_location_str, smbus_child_location_str),
231 DEVMETHOD(bus_print_child, smbus_print_child),
232 DEVMETHOD(bus_read_ivar, smbus_read_ivar),
233 DEVMETHOD(bus_write_ivar, smbus_write_ivar),
238 driver_t smbus_driver = {
241 sizeof(struct smbus_softc),
244 devclass_t smbus_devclass;
246 MODULE_VERSION(smbus, SMBUS_MODVER);