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/* $OpenBSD: lm75.c,v 1.5 2005/12/27 17:18:18 deraadt Exp $ */
/* $NetBSD: lm75.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
/*
* Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
*
* 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.
*/
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* National Semiconductor LM75/LM77 temperature sensor.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/lm75reg.h>
struct lmtemp_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
int sc_address;
int sc_model;
struct sensor sc_sensor;
};
int lmtemp_match(struct device *, void *, void *);
void lmtemp_attach(struct device *, struct device *, void *);
struct cfattach lmtemp_ca = {
sizeof(struct lmtemp_softc),
lmtemp_match,
lmtemp_attach
};
struct cfdriver lmtemp_cd = {
NULL, "lmtemp", DV_DULL
};
int lmtemp_config_write(struct lmtemp_softc *, uint8_t);
int lmtemp_temp_read(struct lmtemp_softc *, uint8_t, int *);
void lmtemp_refresh_sensor_data(void *);
int
lmtemp_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "lm75") == 0 ||
strcmp(ia->ia_name, "ds1775") == 0)
return (1);
return (0);
}
void
lmtemp_attach(struct device *parent, struct device *self, void *aux)
{
struct lmtemp_softc *sc = (struct lmtemp_softc *)self;
struct i2c_attach_args *ia = aux;
u_int8_t ptr[1], reg[LM75_TEMP_LEN];
sc->sc_tag = ia->ia_tag;
sc->sc_address = ia->ia_addr;
sc->sc_model = LM_MODEL_LM75;
/* Try to detect LM77 by poking Thigh register */
ptr[0] = LM77_REG_THIGH;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_address, ptr, 1, reg, LM75_TEMP_LEN, 0) == 0) {
/* Power up default is 64 degC */
if (lm77_wordtotemp((reg[0] << 8) | reg[1]) == 64 * 2)
sc->sc_model = LM_MODEL_LM77;
}
printf(": %s (%s)\n", ia->ia_name,
sc->sc_model == LM_MODEL_LM75 ? "LM75" : "LM77");
iic_release_bus(sc->sc_tag, I2C_F_POLL);
/* Set the configuration to defaults */
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
if (lmtemp_config_write(sc, 0) != 0) {
printf("%s: unable to write config register\n",
sc->sc_dev.dv_xname);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
return;
}
iic_release_bus(sc->sc_tag, I2C_F_POLL);
/* Initialize sensor data */
strlcpy(sc->sc_sensor.device, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensor.device));
sc->sc_sensor.type = SENSOR_TEMP;
strlcpy(sc->sc_sensor.desc, "TEMP", sizeof(sc->sc_sensor.desc));
/* Hook into the hw.sensors sysctl */
SENSOR_ADD(&sc->sc_sensor);
sensor_task_register(sc, lmtemp_refresh_sensor_data, LM_POLLTIME);
}
int
lmtemp_config_write(struct lmtemp_softc *sc, uint8_t val)
{
uint8_t cmdbuf[2];
cmdbuf[0] = LM75_REG_CONFIG;
cmdbuf[1] = val;
return (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL));
}
int
lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, int *valp)
{
u_int8_t cmdbuf[1];
u_int8_t buf[LM75_TEMP_LEN];
int error;
cmdbuf[0] = which;
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_address, cmdbuf, 1, buf, LM75_TEMP_LEN, 0);
if (error)
return (error);
switch (sc->sc_model) {
case LM_MODEL_LM75:
*valp = lm75_wordtotemp((buf[0] << 8) | buf[1]);
break;
case LM_MODEL_LM77:
*valp = lm77_wordtotemp((buf[0] << 8) | buf[1]);
break;
default:
printf("%s: unknown model (%d)\n",
sc->sc_dev.dv_xname, sc->sc_model);
return (1);
}
return (0);
}
void
lmtemp_refresh_sensor_data(void *aux)
{
struct lmtemp_softc *sc = aux;
int val;
int error;
error = lmtemp_temp_read(sc, LM75_REG_TEMP, &val);
if (error) {
#if 0
printf("%s: unable to read temperature, error = %d\n",
sc->sc_dev.dv_xname, error);
#endif
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
sc->sc_sensor.value = val * 500000 + 273150000;
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}
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