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/* $OpenBSD: lis331dl.c,v 1.1 2009/08/12 14:51:20 cnst Exp $ */
/*
* Copyright (c) 2009 Constantine A. Murenin <cnst+openbsd@bugmail.mojo.ru>
*
* 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>
/*
* STMicroelectronics LIS331DL
* MEMS motion sensor
* http://www.stm.com/stonline/products/literature/ds/13951.pdf
* April 2008
*/
/* 3-axis accelerometer */
#define LISA_NUM_AXIS 3
static const struct {
const char *name;
const uint8_t reg;
} lisa_axis[LISA_NUM_AXIS] = {
{ "OUT_X", 0x29 },
{ "OUT_Y", 0x2b },
{ "OUT_Z", 0x2d }
};
struct lisa_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
struct ksensor sc_sensors[LISA_NUM_AXIS];
struct ksensordev sc_sensordev;
};
int lisa_match(struct device *, void *, void *);
void lisa_attach(struct device *, struct device *, void *);
void lisa_refresh(void *);
uint8_t lisa_readreg(struct lisa_softc *, uint8_t);
void lisa_writereg(struct lisa_softc *, uint8_t, uint8_t);
struct cfattach lisa_ca = {
sizeof(struct lisa_softc), lisa_match, lisa_attach
};
struct cfdriver lisa_cd = {
NULL, "lisa", DV_DULL
};
int
lisa_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "lis331dl") == 0)
return 1;
return 0;
}
void
lisa_attach(struct device *parent, struct device *self, void *aux)
{
struct lisa_softc *sc = (struct lisa_softc *)self;
struct i2c_attach_args *ia = aux;
int i;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
printf(": %s", ia->ia_name);
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
for (i = 0; i < LISA_NUM_AXIS; i++) {
strlcpy(sc->sc_sensors[i].desc, lisa_axis[i].name,
sizeof(sc->sc_sensors[i].desc));
sc->sc_sensors[i].type = SENSOR_INTEGER;
sensor_attach(&sc->sc_sensordev, &sc->sc_sensors[i]);
}
if (sensor_task_register(sc, lisa_refresh, 1) == NULL) {
printf(", unable to register update task\n");
return;
}
sensordev_install(&sc->sc_sensordev);
printf("\n");
}
void
lisa_refresh(void *arg)
{
struct lisa_softc *sc = arg;
struct ksensor *s = sc->sc_sensors;
int i;
iic_acquire_bus(sc->sc_tag, 0);
for (i = 0; i < LISA_NUM_AXIS; i++)
s[i].value = (int8_t)lisa_readreg(sc, lisa_axis[i].reg);
iic_release_bus(sc->sc_tag, 0);
}
uint8_t
lisa_readreg(struct lisa_softc *sc, uint8_t reg)
{
uint8_t data;
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, ®, sizeof reg, &data, sizeof data, 0);
return data;
}
void
lisa_writereg(struct lisa_softc *sc, uint8_t reg, uint8_t data)
{
iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, ®, sizeof reg, &data, sizeof data, 0);
}
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