xref: /freebsd/sys/dev/smbus/smbus.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
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("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/lock.h>
34 #include <sys/module.h>
35 #include <sys/mutex.h>
36 #include <sys/bus.h>
37 
38 #include <dev/smbus/smbconf.h>
39 #include <dev/smbus/smbus.h>
40 
41 /*
42  * Autoconfiguration and support routines for System Management bus
43  */
44 
45 /*
46  * Device methods
47  */
48 static int smbus_probe(device_t);
49 static int smbus_attach(device_t);
50 static int smbus_detach(device_t);
51 
52 static device_method_t smbus_methods[] = {
53         /* device interface */
54         DEVMETHOD(device_probe,         smbus_probe),
55         DEVMETHOD(device_attach,        smbus_attach),
56         DEVMETHOD(device_detach,        smbus_detach),
57 
58         /* bus interface */
59 	DEVMETHOD(bus_add_child,	bus_generic_add_child),
60         DEVMETHOD(bus_print_child,	bus_generic_print_child),
61 
62         { 0, 0 }
63 };
64 
65 driver_t smbus_driver = {
66         "smbus",
67         smbus_methods,
68         sizeof(struct smbus_softc),
69 };
70 
71 devclass_t smbus_devclass;
72 
73 /*
74  * At 'probe' time, we add all the devices which we know about to the
75  * bus.  The generic attach routine will probe and attach them if they
76  * are alive.
77  */
78 static int
79 smbus_probe(device_t dev)
80 {
81 
82 	device_set_desc(dev, "System Management Bus");
83 
84 	return (0);
85 }
86 
87 static int
88 smbus_attach(device_t dev)
89 {
90 	struct smbus_softc *sc = device_get_softc(dev);
91 
92 	mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF);
93 	bus_generic_probe(dev);
94 	bus_generic_attach(dev);
95 
96 	return (0);
97 }
98 
99 static int
100 smbus_detach(device_t dev)
101 {
102 	struct smbus_softc *sc = device_get_softc(dev);
103 	int error;
104 
105 	error = bus_generic_detach(dev);
106 	if (error)
107 		return (error);
108 	mtx_destroy(&sc->lock);
109 
110 	return (0);
111 }
112 
113 void
114 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high)
115 {
116 }
117 
118 MODULE_VERSION(smbus, SMBUS_MODVER);
119