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/* $OpenBSD: tmp451.c,v 1.1 2021/06/23 15:25:39 kettenis Exp $ */
/*
* Copyright (c) 2018 Mark Kettenis <kettenis@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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
/* TI TMP451 registers */
#define TMP451_LT_HI 0x00
#define TMP451_RT_HI 0x01
#define TMP451_RT_LO 0x10
#define TMP451_RTOS_HI 0x11
#define TMP451_RTOS_LO 0x12
#define TMP451_LT_LO 0x15
/* Sensors */
#define TITMP_LT 0
#define TITMP_RT 1
#define TITMP_NUM_SENSORS 2
struct titmp_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
uint64_t sc_offset[TITMP_NUM_SENSORS];
struct ksensor sc_sensor[TITMP_NUM_SENSORS];
struct ksensordev sc_sensordev;
};
int titmp_match(struct device *, void *, void *);
void titmp_attach(struct device *, struct device *, void *);
struct cfattach titmp_ca = {
sizeof(struct titmp_softc), titmp_match, titmp_attach
};
struct cfdriver titmp_cd = {
NULL, "titmp", DV_DULL
};
void titmp_read_offsets(struct titmp_softc *);
void titmp_refresh_sensors(void *);
int
titmp_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
return (strcmp(ia->ia_name, "ti,tmp451") == 0);
}
void
titmp_attach(struct device *parent, struct device *self, void *aux)
{
struct titmp_softc *sc = (struct titmp_softc *)self;
struct i2c_attach_args *ia = aux;
int i;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
printf("\n");
titmp_read_offsets(sc);
/* Register sensors. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_sensor[TITMP_LT].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[TITMP_LT].desc, "Local",
sizeof(sc->sc_sensor[TITMP_LT].desc));
sc->sc_sensor[TITMP_RT].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[TITMP_RT].desc, "Remote",
sizeof(sc->sc_sensor[TITMP_RT].desc));
for (i = 0; i < TITMP_NUM_SENSORS; i++)
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
sensordev_install(&sc->sc_sensordev);
sensor_task_register(sc, titmp_refresh_sensors, 5);
}
void
titmp_read_offsets(struct titmp_softc *sc)
{
uint8_t cmd, hi, lo;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
cmd = TMP451_RTOS_HI;
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof(cmd), &hi, sizeof(hi), I2C_F_POLL);
if (error)
goto fail;
cmd = TMP451_RTOS_LO;
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof(cmd), &lo, sizeof(lo), I2C_F_POLL);
if (error)
goto fail;
sc->sc_offset[TITMP_RT] = 1000000 * hi + (lo >> 4) * 1000000 / 16;
fail:
iic_release_bus(sc->sc_tag, I2C_F_POLL);
}
void
titmp_read_sensor(struct titmp_softc *sc, uint8_t cmdhi, uint8_t cmdlo,
int index)
{
uint8_t hi, lo;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmdhi, sizeof(cmdhi), &hi, sizeof(hi), 0))
goto invalid;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmdlo, sizeof(cmdlo), &lo, sizeof(lo), 0))
goto invalid;
sc->sc_sensor[index].value = 273150000 +
1000000 * hi + (lo >> 4) * 1000000 / 16;
sc->sc_sensor[index].value += sc->sc_offset[index];
return;
invalid:
sc->sc_sensor[index].flags |= SENSOR_FINVALID;
}
void
titmp_refresh_sensors(void *arg)
{
struct titmp_softc *sc = arg;
iic_acquire_bus(sc->sc_tag, 0);
titmp_read_sensor(sc, TMP451_LT_HI, TMP451_LT_LO, TITMP_LT);
titmp_read_sensor(sc, TMP451_RT_HI, TMP451_RT_LO, TITMP_RT);
iic_release_bus(sc->sc_tag, 0);
}
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