1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/* $OpenBSD: lm75.c,v 1.8 2006/01/09 19:27:34 deraadt Exp $ */
/* $NetBSD: lm75.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
/*
* Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* National Semiconductor LM75/LM77 temperature sensor.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/lm75reg.h>
struct lmtemp_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
int sc_address;
int sc_model;
struct sensor sc_sensor;
};
int lmtemp_match(struct device *, void *, void *);
void lmtemp_attach(struct device *, struct device *, void *);
struct cfattach lmtemp_ca = {
sizeof(struct lmtemp_softc),
lmtemp_match,
lmtemp_attach
};
struct cfdriver lmtemp_cd = {
NULL, "lmtemp", DV_DULL
};
int lmtemp_config_write(struct lmtemp_softc *, uint8_t);
int lmtemp_temp_read(struct lmtemp_softc *, uint8_t, int *);
void lmtemp_refresh_sensor_data(void *);
int
lmtemp_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "lm75") == 0 ||
strcmp(ia->ia_name, "lm77") == 0 ||
strcmp(ia->ia_name, "ds1775") == 0)
return (1);
return (0);
}
void
lmtemp_attach(struct device *parent, struct device *self, void *aux)
{
struct lmtemp_softc *sc = (struct lmtemp_softc *)self;
struct i2c_attach_args *ia = aux;
sc->sc_tag = ia->ia_tag;
sc->sc_address = ia->ia_addr;
sc->sc_model = LM_MODEL_LM75;
if (strcmp(ia->ia_name, "lm77") == 0)
sc->sc_model = LM_MODEL_LM77;
printf(": %s\n", ia->ia_name);
iic_release_bus(sc->sc_tag, 0);
/* Set the configuration to defaults */
iic_acquire_bus(sc->sc_tag, 0);
if (lmtemp_config_write(sc, 0) != 0) {
printf("%s: unable to write config register\n",
sc->sc_dev.dv_xname);
iic_release_bus(sc->sc_tag, 0);
return;
}
iic_release_bus(sc->sc_tag, 0);
/* Initialize sensor data */
strlcpy(sc->sc_sensor.device, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensor.device));
sc->sc_sensor.type = SENSOR_TEMP;
strlcpy(sc->sc_sensor.desc, "TEMP", sizeof(sc->sc_sensor.desc));
/* Hook into the hw.sensors sysctl */
SENSOR_ADD(&sc->sc_sensor);
sensor_task_register(sc, lmtemp_refresh_sensor_data, LM_POLLTIME);
}
int
lmtemp_config_write(struct lmtemp_softc *sc, uint8_t val)
{
uint8_t cmdbuf[2];
cmdbuf[0] = LM75_REG_CONFIG;
cmdbuf[1] = val;
return (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, 0));
}
int
lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, int *valp)
{
u_int8_t cmdbuf[1];
u_int8_t buf[LM75_TEMP_LEN];
int error;
cmdbuf[0] = which;
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_address, cmdbuf, 1, buf, LM75_TEMP_LEN, 0);
if (error)
return (error);
switch (sc->sc_model) {
case LM_MODEL_LM75:
*valp = lm75_wordtotemp((buf[0] << 8) | buf[1]);
break;
case LM_MODEL_LM77:
*valp = lm77_wordtotemp((buf[0] << 8) | buf[1]);
break;
default:
printf("%s: unknown model (%d)\n",
sc->sc_dev.dv_xname, sc->sc_model);
return (1);
}
return (0);
}
void
lmtemp_refresh_sensor_data(void *aux)
{
struct lmtemp_softc *sc = aux;
int val;
int error;
error = lmtemp_temp_read(sc, LM75_REG_TEMP, &val);
if (error) {
#if 0
printf("%s: unable to read temperature, error = %d\n",
sc->sc_dev.dv_xname, error);
#endif
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
sc->sc_sensor.value = val * 500000 + 273150000;
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}
|
