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>
49 * Autoconfiguration and support routines for System Management bus
53 smbus_probe(device_t dev)
56 device_set_desc(dev, "System Management Bus");
62 smbus_attach(device_t dev)
64 struct smbus_softc *sc = device_get_softc(dev);
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);
75 smbus_detach(device_t dev)
77 struct smbus_softc *sc = device_get_softc(dev);
80 error = bus_generic_detach(dev);
83 device_delete_children(dev);
84 mtx_destroy(&sc->lock);
90 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err)
95 smbus_add_child(device_t dev, u_int order, const char *name, int unit)
97 struct smbus_ivar *devi;
100 child = device_add_child_ordered(dev, order, name, unit);
103 devi = malloc(sizeof(struct smbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
105 device_delete_child(dev, child);
108 device_set_ivars(child, devi);
113 smbus_hinted_child(device_t bus, const char *dname, int dunit)
115 struct smbus_ivar *devi;
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);
126 child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit);
129 devi = device_get_ivars(child);
135 smbus_child_location_str(device_t parent, device_t child, char *buf,
138 struct smbus_ivar *devi;
140 devi = device_get_ivars(child);
142 snprintf(buf, buflen, "addr=0x%x", devi->addr);
149 smbus_print_child(device_t parent, device_t child)
151 struct smbus_ivar *devi;
154 devi = device_get_ivars(child);
155 retval = bus_print_child_header(parent, child);
157 retval += printf(" at addr 0x%x", devi->addr);
158 retval += bus_print_child_footer(parent, child);
164 smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result)
166 struct smbus_ivar *devi;
168 devi = device_get_ivars(child);
170 case SMBUS_IVAR_ADDR:
172 *result = devi->addr;
183 smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value)
185 struct smbus_ivar *devi;
187 devi = device_get_ivars(child);
189 case SMBUS_IVAR_ADDR:
190 /* Allow to set but no change the slave address. */
202 smbus_probe_nomatch(device_t bus, device_t child)
204 struct smbus_ivar *devi = device_get_ivars(child);
207 * Ignore (self-identified) devices without a slave address set.
208 * For example, smb(4).
211 device_printf(bus, "<unknown device> at addr %#x\n",
218 static 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),
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),
236 driver_t smbus_driver = {
239 sizeof(struct smbus_softc),
242 devclass_t smbus_devclass;
244 MODULE_VERSION(smbus, SMBUS_MODVER);