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
|
/* $OpenBSD: ds1631.c,v 1.12 2016/05/12 21:00:23 kettenis Exp $ */
/*
* Copyright (c) 2005 Theo de Raadt
*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
/* Maxim ds 1631 registers */
#define DS1631_START 0x51
#define DS1624_START 0xee
#define DS1631_TEMP 0xaa
#define DS1631_CONTROL 0xac
#define DS1631_CONTROL_DONE 0x80
#define DS1631_CONTROL_1SHOT 0x01
/* Sensors */
#define MAXDS_TEMP 0
#define MAXDS_NUM_SENSORS 1
struct maxds_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
struct ksensor sc_sensor[MAXDS_NUM_SENSORS];
struct ksensordev sc_sensordev;
};
int maxds_match(struct device *, void *, void *);
void maxds_attach(struct device *, struct device *, void *);
void maxds_refresh(void *);
struct cfattach maxds_ca = {
sizeof(struct maxds_softc), maxds_match, maxds_attach
};
struct cfdriver maxds_cd = {
NULL, "maxds", DV_DULL
};
int
maxds_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "ds1631") == 0 ||
strcmp(ia->ia_name, "ds1624") == 0 ||
strcmp(ia->ia_name, "ds1721") == 0)
return (1);
return (0);
}
void
maxds_attach(struct device *parent, struct device *self, void *aux)
{
struct maxds_softc *sc = (struct maxds_softc *)self;
struct i2c_attach_args *ia = aux;
u_int8_t cmd, data;
int i;
printf(": %s", ia->ia_name);
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
iic_acquire_bus(sc->sc_tag, 0);
cmd = DS1631_CONTROL;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0) {
if (data & DS1631_CONTROL_1SHOT) {
/*
* 1-Shot mode would require us to write every refresh
* which is stupid. Put us into continuous mode.
*/
data &= ~DS1631_CONTROL_1SHOT;
(void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
//delay(10 * 1000);
printf(", continuous");
goto dostart;
}
if (data & DS1631_CONTROL_DONE) {
dostart:
cmd = DS1631_START;
if (strcmp(ia->ia_name, "ds1624") == 0)
cmd = DS1624_START;
(void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, NULL, 0, 0);
printf(", starting");
}
} else {
iic_release_bus(sc->sc_tag, 0);
printf(", fails to respond\n");
return;
}
iic_release_bus(sc->sc_tag, 0);
/* Initialize sensor data. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_sensor[MAXDS_TEMP].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[MAXDS_TEMP].desc, "Internal",
sizeof(sc->sc_sensor[MAXDS_TEMP].desc));
if (sensor_task_register(sc, maxds_refresh, 5) == NULL) {
printf(", unable to register update task\n");
return;
}
for (i = 0; i < MAXDS_NUM_SENSORS; i++)
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
sensordev_install(&sc->sc_sensordev);
printf("\n");
}
void
maxds_refresh(void *arg)
{
struct maxds_softc *sc = arg;
u_int8_t cmd;
u_int16_t data;
iic_acquire_bus(sc->sc_tag, 0);
cmd = DS1631_TEMP;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0) {
sc->sc_sensor[MAXDS_TEMP].value = 273150000 +
(int)(betoh16(data)) / 8 * 31250;
sc->sc_sensor[MAXDS_TEMP].flags &= ~SENSOR_FINVALID;
} else
sc->sc_sensor[MAXDS_TEMP].flags |= SENSOR_FINVALID;
iic_release_bus(sc->sc_tag, 0);
}
|
