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/* $OpenBSD: ds1631.c,v 1.7 2006/12/23 17:46:39 deraadt 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 sensor sc_sensor[MAXDS_NUM_SENSORS];
struct sensordev 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");
}
}
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)) {
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, data[2];
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)((u_int16_t)data[0] << 8 | data[1])) / 8 * 31250;
iic_release_bus(sc->sc_tag, 0);
}
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