Annotation of sys/dev/i2c/ds1631.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ds1631.c,v 1.9 2007/06/24 05:34:35 dlg 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: maxds_match(struct device *parent, void *match, void *aux)
61: {
62: struct i2c_attach_args *ia = aux;
63:
64: if (strcmp(ia->ia_name, "ds1631") == 0 ||
65: strcmp(ia->ia_name, "ds1624") == 0 ||
66: strcmp(ia->ia_name, "ds1721") == 0)
67: return (1);
68: return (0);
69: }
70:
71: void
72: maxds_attach(struct device *parent, struct device *self, void *aux)
73: {
74: struct maxds_softc *sc = (struct maxds_softc *)self;
75: struct i2c_attach_args *ia = aux;
76: u_int8_t cmd, data;
77: int i;
78:
79: printf(": %s", ia->ia_name);
80:
81: sc->sc_tag = ia->ia_tag;
82: sc->sc_addr = ia->ia_addr;
83:
84: iic_acquire_bus(sc->sc_tag, 0);
85:
86: cmd = DS1631_CONTROL;
87: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
88: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0) {
89: 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: data &= ~DS1631_CONTROL_1SHOT;
95:
96: (void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
97: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
98: //delay(10 * 1000);
99: printf(", continuous");
100: goto dostart;
101: }
102: if (data & DS1631_CONTROL_DONE) {
103: dostart:
104: cmd = DS1631_START;
105: if (strcmp(ia->ia_name, "ds1624") == 0)
106: cmd = DS1624_START;
107: (void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
108: sc->sc_addr, &cmd, sizeof cmd, NULL, 0, 0);
109: printf(", starting");
110: }
111: }
112:
113: iic_release_bus(sc->sc_tag, 0);
114:
115: /* Initialize sensor data. */
116: strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
117: sizeof(sc->sc_sensordev.xname));
118:
119: sc->sc_sensor[MAXDS_TEMP].type = SENSOR_TEMP;
120: strlcpy(sc->sc_sensor[MAXDS_TEMP].desc, "Internal",
121: sizeof(sc->sc_sensor[MAXDS_TEMP].desc));
122:
123: if (sensor_task_register(sc, maxds_refresh, 5) == NULL) {
124: printf(", unable to register update task\n");
125: return;
126: }
127:
128: for (i = 0; i < MAXDS_NUM_SENSORS; i++)
129: sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
130: sensordev_install(&sc->sc_sensordev);
131:
132: printf("\n");
133: }
134:
135: void
136: maxds_refresh(void *arg)
137: {
138: struct maxds_softc *sc = arg;
139: u_int8_t cmd, data[2];
140:
141: iic_acquire_bus(sc->sc_tag, 0);
142:
143: cmd = DS1631_TEMP;
144: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
145: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0)
146: sc->sc_sensor[MAXDS_TEMP].value = 273150000 +
147: ((int)((u_int16_t)data[0] << 8 | data[1])) / 8 * 31250;
148:
149: iic_release_bus(sc->sc_tag, 0);
150: }
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