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 * $FreeBSD: src/sys/dev/smbus/smbus.c,v 1.18.10.4 2006/09/26 18:44:56 jhb Exp $
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33 #include <sys/bus.h>
34
35 #include "smbconf.h"
36 #include "smbus.h"
37 #include "smbus_if.h"
38
39 /*
40 * Autoconfiguration and support routines for System Management bus
41 */
42
43 /*
44 * Device methods
45 */
46 static int smbus_probe(device_t);
47 static int smbus_attach(device_t);
48 static int smbus_detach(device_t);
49
50 static device_t smbus_add_child(device_t bus, device_t parent, int order,
51 const char *name, int unit);
52 static void smbus_probe_device(device_t dev, u_char addr);
53
54 static device_method_t smbus_methods[] = {
55 /* device interface */
56 DEVMETHOD(device_probe, smbus_probe),
57 DEVMETHOD(device_attach, smbus_attach),
58 DEVMETHOD(device_detach, smbus_detach),
59
60 /* bus interface */
61 DEVMETHOD(bus_add_child, smbus_add_child),
62 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
63 DEVMETHOD(bus_print_child, bus_generic_print_child),
64
65 DEVMETHOD_END
66 };
67
68 driver_t smbus_driver = {
69 "smbus",
70 smbus_methods,
71 sizeof(struct smbus_softc),
72 };
73
74 devclass_t smbus_devclass;
75
76 /*
77 * At 'probe' time, we add all the devices which we know about to the
78 * bus. The generic attach routine will probe and attach them if they
79 * are alive.
80 */
81 static int
smbus_probe(device_t dev)82 smbus_probe(device_t dev)
83 {
84 device_set_desc(dev, "System Management Bus");
85
86 return (0);
87 }
88
89 static int
smbus_attach(device_t dev)90 smbus_attach(device_t dev)
91 {
92 unsigned char addr;
93
94 device_add_child(dev, NULL, device_get_unit(dev));
95 for (addr = 16; addr < 112; ++addr) {
96 smbus_probe_device(dev, addr);
97 }
98
99 /*bus_generic_probe(dev);*/
100 bus_generic_attach(dev);
101
102 return (0);
103 }
104
105 static int
smbus_detach(device_t dev)106 smbus_detach(device_t dev)
107 {
108 int error;
109
110 error = bus_generic_detach(dev);
111 if (error)
112 return (error);
113
114 return (0);
115 }
116
117 void
smbus_generic_intr(device_t dev,u_char devaddr,char low,char high)118 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high)
119 {
120 }
121
122 static void
smbus_probe_device(device_t dev,u_char addr)123 smbus_probe_device(device_t dev, u_char addr)
124 {
125 int error;
126 u_char cmd;
127 u_char buf[2];
128
129 cmd = 0x01;
130
131 error = smbus_trans(dev, addr, cmd,
132 SMB_TRANS_NOCNT | SMB_TRANS_NOREPORT,
133 NULL, 0, buf, 1, NULL);
134 if (error == 0) {
135 device_printf(dev, "Probed address 0x%02x\n", addr);
136 /* device_add_child / specific */
137 device_add_child(dev, NULL,
138 (device_get_unit(dev) << 11) | 0x0400 | addr);
139 }
140 }
141
142 static device_t
smbus_add_child(device_t bus,device_t parent,int order,const char * name,int unit)143 smbus_add_child(device_t bus, device_t parent, int order,
144 const char *name, int unit)
145 {
146 device_t child;
147
148 kprintf("smbus_add_child unit %d\n", unit);
149 child = device_add_child_ordered(parent, order, name, unit);
150 device_probe_and_attach(child);
151
152 return child;
153 }
154
155
156 MODULE_VERSION(smbus, SMBUS_MODVER);
157