Return to ds1631.c CVS log

Up to [local] / sys / dev / i2c

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: }