Line data Source code
1 : /* $OpenBSD: ds1631.c,v 1.12 2016/05/12 21:00:23 kettenis Exp $ */
2 :
3 : /*
4 : * Copyright (c) 2005 Theo de Raadt
5 : *
6 : * Permission to use, copy, modify, and distribute this software for any
7 : * purpose with or without fee is hereby granted, provided that the above
8 : * copyright notice and this permission notice appear in all copies.
9 : *
10 : * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 : * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 : * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 : * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 : * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 : * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 : * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 : */
18 :
19 : #include <sys/param.h>
20 : #include <sys/systm.h>
21 : #include <sys/device.h>
22 : #include <sys/sensors.h>
23 :
24 : #include <dev/i2c/i2cvar.h>
25 :
26 : /* Maxim ds 1631 registers */
27 : #define DS1631_START 0x51
28 : #define DS1624_START 0xee
29 : #define DS1631_TEMP 0xaa
30 : #define DS1631_CONTROL 0xac
31 : #define DS1631_CONTROL_DONE 0x80
32 : #define DS1631_CONTROL_1SHOT 0x01
33 :
34 : /* Sensors */
35 : #define MAXDS_TEMP 0
36 : #define MAXDS_NUM_SENSORS 1
37 :
38 : struct maxds_softc {
39 : struct device sc_dev;
40 : i2c_tag_t sc_tag;
41 : i2c_addr_t sc_addr;
42 :
43 : struct ksensor sc_sensor[MAXDS_NUM_SENSORS];
44 : struct ksensordev sc_sensordev;
45 : };
46 :
47 : int maxds_match(struct device *, void *, void *);
48 : void maxds_attach(struct device *, struct device *, void *);
49 : void maxds_refresh(void *);
50 :
51 : struct cfattach maxds_ca = {
52 : sizeof(struct maxds_softc), maxds_match, maxds_attach
53 : };
54 :
55 : struct cfdriver maxds_cd = {
56 : NULL, "maxds", DV_DULL
57 : };
58 :
59 : int
60 0 : maxds_match(struct device *parent, void *match, void *aux)
61 : {
62 0 : struct i2c_attach_args *ia = aux;
63 :
64 0 : if (strcmp(ia->ia_name, "ds1631") == 0 ||
65 0 : strcmp(ia->ia_name, "ds1624") == 0 ||
66 0 : strcmp(ia->ia_name, "ds1721") == 0)
67 0 : return (1);
68 0 : return (0);
69 0 : }
70 :
71 : void
72 0 : maxds_attach(struct device *parent, struct device *self, void *aux)
73 : {
74 0 : struct maxds_softc *sc = (struct maxds_softc *)self;
75 0 : struct i2c_attach_args *ia = aux;
76 0 : u_int8_t cmd, data;
77 : int i;
78 :
79 0 : printf(": %s", ia->ia_name);
80 :
81 0 : sc->sc_tag = ia->ia_tag;
82 0 : sc->sc_addr = ia->ia_addr;
83 :
84 0 : iic_acquire_bus(sc->sc_tag, 0);
85 :
86 0 : cmd = DS1631_CONTROL;
87 0 : if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
88 0 : sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0) {
89 0 : if (data & DS1631_CONTROL_1SHOT) {
90 : /*
91 : * 1-Shot mode would require us to write every refresh
92 : * which is stupid. Put us into continuous mode.
93 : */
94 0 : data &= ~DS1631_CONTROL_1SHOT;
95 :
96 0 : (void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
97 0 : sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
98 : //delay(10 * 1000);
99 0 : printf(", continuous");
100 0 : goto dostart;
101 : }
102 0 : if (data & DS1631_CONTROL_DONE) {
103 : dostart:
104 0 : cmd = DS1631_START;
105 0 : if (strcmp(ia->ia_name, "ds1624") == 0)
106 0 : cmd = DS1624_START;
107 0 : (void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
108 0 : sc->sc_addr, &cmd, sizeof cmd, NULL, 0, 0);
109 0 : printf(", starting");
110 0 : }
111 : } else {
112 0 : iic_release_bus(sc->sc_tag, 0);
113 0 : printf(", fails to respond\n");
114 0 : return;
115 : }
116 :
117 0 : iic_release_bus(sc->sc_tag, 0);
118 :
119 : /* Initialize sensor data. */
120 0 : strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
121 : sizeof(sc->sc_sensordev.xname));
122 :
123 0 : sc->sc_sensor[MAXDS_TEMP].type = SENSOR_TEMP;
124 0 : strlcpy(sc->sc_sensor[MAXDS_TEMP].desc, "Internal",
125 : sizeof(sc->sc_sensor[MAXDS_TEMP].desc));
126 :
127 0 : if (sensor_task_register(sc, maxds_refresh, 5) == NULL) {
128 0 : printf(", unable to register update task\n");
129 0 : return;
130 : }
131 :
132 0 : for (i = 0; i < MAXDS_NUM_SENSORS; i++)
133 0 : sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
134 0 : sensordev_install(&sc->sc_sensordev);
135 :
136 0 : printf("\n");
137 0 : }
138 :
139 : void
140 0 : maxds_refresh(void *arg)
141 : {
142 0 : struct maxds_softc *sc = arg;
143 0 : u_int8_t cmd;
144 0 : u_int16_t data;
145 :
146 0 : iic_acquire_bus(sc->sc_tag, 0);
147 :
148 0 : cmd = DS1631_TEMP;
149 0 : if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
150 0 : sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0) {
151 0 : sc->sc_sensor[MAXDS_TEMP].value = 273150000 +
152 0 : (int)(betoh16(data)) / 8 * 31250;
153 0 : sc->sc_sensor[MAXDS_TEMP].flags &= ~SENSOR_FINVALID;
154 0 : } else
155 0 : sc->sc_sensor[MAXDS_TEMP].flags |= SENSOR_FINVALID;
156 :
157 0 : iic_release_bus(sc->sc_tag, 0);
158 0 : }
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