NetBSD/sys/dev/i2c/lm75.c

243 lines
6.7 KiB
C

/* $NetBSD: lm75.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
/*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <dev/sysmon/sysmonvar.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;
struct envsys_tre_data sc_sensor[1];
struct envsys_basic_info sc_info[1];
struct sysmon_envsys sc_sysmon;
};
static int lmtemp_match(struct device *, struct cfdata *, void *);
static void lmtemp_attach(struct device *, struct device *, void *);
CFATTACH_DECL(lmtemp, sizeof(struct lmtemp_softc),
lmtemp_match, lmtemp_attach, NULL, NULL);
static int lmtemp_gtredata(struct sysmon_envsys *,
struct envsys_tre_data *);
static int lmtemp_streinfo(struct sysmon_envsys *,
struct envsys_basic_info *);
static const struct envsys_range lmtemp_ranges[] = {
{ 0, 1, ENVSYS_STEMP },
{ 1, 0, -1 },
};
static int lmtemp_config_write(struct lmtemp_softc *, uint8_t);
static int
lmtemp_match(struct device *parent, struct cfdata *cf, void *aux)
{
struct i2c_attach_args *ia = aux;
if ((ia->ia_addr & LM75_ADDRMASK) == LM75_ADDR)
return (1);
return (0);
}
static 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;
int ptype;
sc->sc_tag = ia->ia_tag;
sc->sc_address = ia->ia_addr;
aprint_naive(": Temperature Sensor\n");
aprint_normal(": LM75 Temperature Sensor\n");
/* Set the configuration of the LM75 to defaults. */
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
if (lmtemp_config_write(sc, 0) != 0) {
aprint_error("%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. */
sc->sc_sensor[0].sensor = sc->sc_info[0].sensor = 0;
sc->sc_sensor[0].validflags = ENVSYS_FVALID;
sc->sc_info[0].validflags = ENVSYS_FVALID;
sc->sc_sensor[0].warnflags = ENVSYS_WARN_OK;
sc->sc_sensor[0].units = sc->sc_info[0].units = ENVSYS_STEMP;
if (prop_get(dev_propdb, &sc->sc_dev, "description",
sc->sc_info[0].desc, sizeof(sc->sc_info[0].desc),
&ptype) < 1 ||
ptype != PROP_STRING)
strcpy(sc->sc_info[0].desc, sc->sc_dev.dv_xname);
/* Hook info system monitor. */
sc->sc_sysmon.sme_ranges = lmtemp_ranges;
sc->sc_sysmon.sme_sensor_info = sc->sc_info;
sc->sc_sysmon.sme_sensor_data = sc->sc_sensor;
sc->sc_sysmon.sme_cookie = sc;
sc->sc_sysmon.sme_gtredata = lmtemp_gtredata;
sc->sc_sysmon.sme_streinfo = lmtemp_streinfo;
sc->sc_sysmon.sme_nsensors = 1;
sc->sc_sysmon.sme_envsys_version = 1000;
if (sysmon_envsys_register(&sc->sc_sysmon))
aprint_error("%s: unable to register with sysmon\n",
sc->sc_dev.dv_xname);
}
static 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));
}
static int
lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, uint32_t *valp)
{
int error, neg, temp;
uint32_t val;
uint8_t cmdbuf[1];
uint8_t buf[LM75_TEMP_LEN];
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);
if (buf[0] & 1) {
/* Below 0C */
temp = ~buf[1] + 1;
neg = 1;
} else {
temp = buf[1];
neg = 0;
}
/* Temp is given in 1/2 deg. C, we convert to uK. */
val = ((neg ? -temp : temp) / 2) * 1000000 + 273150000;
if (temp & 1) {
if (neg)
val -= 500000;
else
val += 500000;
}
*valp = val;
return (0);
}
static void
lmtemp_refresh_sensor_data(struct lmtemp_softc *sc)
{
uint32_t 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[0].validflags &= ~ENVSYS_FCURVALID;
return;
}
sc->sc_sensor[0].cur.data_us = val;
sc->sc_sensor[0].validflags |= ENVSYS_FCURVALID;
}
static int
lmtemp_gtredata(struct sysmon_envsys *sme, struct envsys_tre_data *tred)
{
struct lmtemp_softc *sc = sme->sme_cookie;
iic_acquire_bus(sc->sc_tag, 0); /* also locks our instance */
lmtemp_refresh_sensor_data(sc);
*tred = sc->sc_sensor[tred->sensor];
iic_release_bus(sc->sc_tag, 0); /* also unlocks our instance */
return (0);
}
static int
lmtemp_streinfo(struct sysmon_envsys *sme, struct envsys_basic_info *binfo)
{
struct lmtemp_softc *sc = sme->sme_cookie;
iic_acquire_bus(sc->sc_tag, 0); /* also locks our instance */
memcpy(sc->sc_info[binfo->sensor].desc, binfo->desc,
sizeof(sc->sc_info[binfo->sensor].desc));
sc->sc_info[binfo->sensor].desc[
sizeof(sc->sc_info[binfo->sensor].desc) - 1] = '\0';
iic_release_bus(sc->sc_tag, 0); /* also unlocks our instance */
binfo->validflags = ENVSYS_FVALID;
return (0);
}