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/* $OpenBSD: sdtemp.c,v 1.1 2008/04/07 01:31:44 deraadt Exp $ */
/*
* Copyright (c) 2008 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>
/* JDEC JC-42.4 registers */
#define JC_TEMP 0x05
#define JC_TEMP_SIGN 0x10
/* Sensors */
#define JCTEMP_TEMP 0
#define JCTEMP_NUM_SENSORS 1
struct sdtemp_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
struct ksensor sc_sensor[JCTEMP_NUM_SENSORS];
struct ksensordev sc_sensordev;
};
int sdtemp_match(struct device *, void *, void *);
void sdtemp_attach(struct device *, struct device *, void *);
void sdtemp_refresh(void *);
struct cfattach sdtemp_ca = {
sizeof(struct sdtemp_softc), sdtemp_match, sdtemp_attach
};
struct cfdriver sdtemp_cd = {
NULL, "sdtemp", DV_DULL
};
int
sdtemp_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "se98") == 0 ||
strcmp(ia->ia_name, "adt7408") == 0)
return (1);
return (0);
}
void
sdtemp_attach(struct device *parent, struct device *self, void *aux)
{
struct sdtemp_softc *sc = (struct sdtemp_softc *)self;
struct i2c_attach_args *ia = aux;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
printf(": %s", ia->ia_name);
/* Initialize sensor data. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_sensor[JCTEMP_TEMP].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[JCTEMP_TEMP].desc, "Temperature",
sizeof(sc->sc_sensor[JCTEMP_TEMP].desc));
if (sensor_task_register(sc, sdtemp_refresh, 5) == NULL) {
printf(", unable to register update task\n");
return;
}
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[0]);
sensordev_install(&sc->sc_sensordev);
printf("\n");
}
void
sdtemp_refresh(void *arg)
{
struct sdtemp_softc *sc = arg;
u_int8_t cmd, data[2];
int16_t sdata;
iic_acquire_bus(sc->sc_tag, 0);
cmd = JC_TEMP;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, data, sizeof data, 0) == 0) {
sdata = ((data[0] << 8) | data[1]) & 0x0fff;
if (data[0] & JC_TEMP_SIGN)
sdata = -sdata;
sc->sc_sensor[JCTEMP_TEMP].value =
273150000 + 62500 * sdata;
sc->sc_sensor[JCTEMP_TEMP].flags &= ~SENSOR_FINVALID;
#if 0
printf("sdtemp %02x%02x %04x %d\n", data[0], data[1],
(u_int)sdata & 0xffff,
sc->sc_sensor[JCTEMP_TEMP].value);
#endif
}
iic_release_bus(sc->sc_tag, 0);
}
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