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 #include "smbus_if.h"
42 #include "bus_if.h"
43
44
45 /*
46 * Autoconfiguration and support routines for System Management bus
47 */
48
49 /*
50 * Device methods
51 */
52 static int smbus_probe(device_t);
53 static int smbus_attach(device_t);
54 static int smbus_detach(device_t);
55
56 static int smbus_child_location_str(device_t parent, device_t child,
57 char *buf, size_t buflen);
58 static int smbus_print_child(device_t parent, device_t child);
59 static void smbus_probe_device(device_t dev, u_char* addr);
60 static int smbus_read_ivar(device_t parent, device_t child, int which,
61 uintptr_t *result);
62
63 static device_method_t smbus_methods[] = {
64 /* device interface */
65 DEVMETHOD(device_probe, smbus_probe),
66 DEVMETHOD(device_attach, smbus_attach),
67 DEVMETHOD(device_detach, smbus_detach),
68
69 /* bus interface */
70 DEVMETHOD(bus_add_child, bus_generic_add_child),
71 DEVMETHOD(bus_child_location_str, smbus_child_location_str),
72 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
73 DEVMETHOD(bus_print_child, smbus_print_child),
74 DEVMETHOD(bus_read_ivar, smbus_read_ivar),
75
76 DEVMETHOD_END
77 };
78
79 driver_t smbus_driver = {
80 "smbus",
81 smbus_methods,
82 sizeof(struct smbus_softc),
83 };
84
85 devclass_t smbus_devclass;
86
87 /*
88 * At 'probe' time, we add all the devices which we know about to the
89 * bus. The generic attach routine will probe and attach them if they
90 * are alive.
91 */
92 static int
smbus_probe(device_t dev)93 smbus_probe(device_t dev)
94 {
95
96 device_set_desc(dev, "System Management Bus");
97
98 return (0);
99 }
100
101 static int
smbus_attach(device_t dev)102 smbus_attach(device_t dev)
103 {
104 struct smbus_softc *sc = device_get_softc(dev);
105 unsigned char addr;
106
107 mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF);
108 bus_generic_probe(dev);
109 for (addr = SMBUS_ADDR_MIN; addr < SMBUS_ADDR_MAX; ++addr) {
110 sc->addrs[addr] = addr;
111 smbus_probe_device(dev, &sc->addrs[addr]);
112 }
113 bus_generic_attach(dev);
114
115 return (0);
116 }
117
118 static int
smbus_detach(device_t dev)119 smbus_detach(device_t dev)
120 {
121 struct smbus_softc *sc = device_get_softc(dev);
122 int error;
123
124 error = bus_generic_detach(dev);
125 if (error)
126 return (error);
127 mtx_destroy(&sc->lock);
128
129 return (0);
130 }
131
132 void
smbus_generic_intr(device_t dev,u_char devaddr,char low,char high,int err)133 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err)
134 {
135 }
136
137 static void
smbus_probe_device(device_t dev,u_char * addr)138 smbus_probe_device(device_t dev, u_char* addr)
139 {
140 device_t child;
141 int error;
142 u_char cmd;
143 u_char buf[2];
144
145 cmd = 0x01;
146 error = smbus_trans(dev, *addr, cmd,
147 SMB_TRANS_NOCNT | SMB_TRANS_NOREPORT,
148 NULL, 0, buf, 1, NULL);
149 if (error == 0) {
150 if (bootverbose)
151 device_printf(dev, "Probed address 0x%02x\n", *addr);
152 child = device_add_child(dev, NULL, -1);
153 device_set_ivars(child, addr);
154 }
155 }
156
157 static int
smbus_child_location_str(device_t parent,device_t child,char * buf,size_t buflen)158 smbus_child_location_str(device_t parent, device_t child, char *buf,
159 size_t buflen)
160 {
161 unsigned char *addr;
162
163 addr = device_get_ivars(child);
164 if (addr)
165 snprintf(buf, buflen, "addr=0x%x", *addr);
166 else if (buflen)
167 buf[0] = 0;
168 return (0);
169 }
170
171 static int
smbus_print_child(device_t parent,device_t child)172 smbus_print_child(device_t parent, device_t child)
173 {
174 unsigned char *addr;
175 int retval;
176
177 addr = device_get_ivars(child);
178 retval = bus_print_child_header(parent, child);
179 if (addr)
180 retval += printf(" at addr 0x%x", *addr);
181 retval += bus_print_child_footer(parent, child);
182
183 return (retval);
184 }
185
186 static int
smbus_read_ivar(device_t parent,device_t child,int which,uintptr_t * result)187 smbus_read_ivar(device_t parent, device_t child, int which,
188 uintptr_t *result)
189 {
190 unsigned char *addr;
191
192 addr = device_get_ivars(child);
193 switch (which) {
194 case SMBUS_IVAR_ADDR:
195 *result = (addr == NULL) ? -1 : *addr;
196 break;
197 default:
198 return (ENOENT);
199 }
200 return (0);
201 }
202
203 MODULE_VERSION(smbus, SMBUS_MODVER);
204