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/* $OpenBSD: bmc150.c,v 1.1 2017/11/30 14:53:21 kettenis Exp $ */
/*
* Copyright (c) 2017 Mark Kettenis
*
* 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>
#define BGW_CHIPID 0x00
#define BGW_CHIPID_BMA222E 0xf8
#define BGW_CHIPID_BMA250E 0xf9
#define BGW_CHIPID_BMC150 0xfa
#define BGW_CHIPID_BMI055 0xfa
#define BGW_CHIPID_BMA255 0xfa
#define BGW_CHIPID_BMA280 0xfb
#define ACCD_X_LSB 0x02
#define ACCD_X_MSB 0x03
#define ACCD_Y_LSB 0x04
#define ACCD_Y_MSB 0x05
#define ACCD_Z_LSB 0x06
#define ACCD_Z_MSB 0x07
#define ACCD_TEMP 0x08
#define BGW_NUM_SENSORS 4
#define BGW_SENSOR_XACCEL 0
#define BGW_SENSOR_YACCEL 1
#define BGW_SENSOR_ZACCEL 2
#define BGW_SENSOR_TEMP 3
struct bgw_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
uint8_t sc_temp0;
struct ksensor sc_sensor[BGW_NUM_SENSORS];
struct ksensordev sc_sensordev;
};
int bgw_match(struct device *, void *, void *);
void bgw_attach(struct device *, struct device *, void *);
struct cfattach bgw_ca = {
sizeof(struct bgw_softc), bgw_match, bgw_attach
};
struct cfdriver bgw_cd = {
NULL, "bgw", DV_DULL
};
void bgw_refresh(void *);
int
bgw_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "BSBA0150") == 0 ||
strcmp(ia->ia_name, "BMC150A") == 0 ||
strcmp(ia->ia_name, "BMI055A") == 0 ||
strcmp(ia->ia_name, "BMA0255") == 0 ||
strcmp(ia->ia_name, "BMA250E") == 0 ||
strcmp(ia->ia_name, "BMA222E") == 0 ||
strcmp(ia->ia_name, "BMA0280") == 0 ||
strcmp(ia->ia_name, "BOSC0200") == 0)
return 1;
return 0;
}
void
bgw_attach(struct device *parent, struct device *self, void *aux)
{
struct bgw_softc *sc = (struct bgw_softc *)self;
struct i2c_attach_args *ia = aux;
uint8_t cmd, data;
int i;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
iic_acquire_bus(sc->sc_tag, 0);
cmd = BGW_CHIPID;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
printf(": can't read chip ID\n");
return;
}
iic_release_bus(sc->sc_tag, 0);
switch (data) {
case BGW_CHIPID_BMA222E:
sc->sc_temp0 = 23;
printf(": BMA222E");
break;
case BGW_CHIPID_BMA250E:
sc->sc_temp0 = 23;
printf(": BMA250E");
break;
case BGW_CHIPID_BMC150:
sc->sc_temp0 = 24;
printf(": BMC150");
break;
case BGW_CHIPID_BMA280:
sc->sc_temp0 = 23;
printf(": BMA280");
break;
}
sc->sc_sensor[BGW_SENSOR_XACCEL].type = SENSOR_INTEGER;
strlcpy(sc->sc_sensor[BGW_SENSOR_XACCEL].desc, "X_ACCEL",
sizeof(sc->sc_sensor[BGW_SENSOR_XACCEL].desc));
sc->sc_sensor[BGW_SENSOR_YACCEL].type = SENSOR_INTEGER;
strlcpy(sc->sc_sensor[BGW_SENSOR_YACCEL].desc, "Y_ACCEL",
sizeof(sc->sc_sensor[BGW_SENSOR_YACCEL].desc));
sc->sc_sensor[BGW_SENSOR_ZACCEL].type = SENSOR_INTEGER;
strlcpy(sc->sc_sensor[BGW_SENSOR_ZACCEL].desc, "Z_ACCEL",
sizeof(sc->sc_sensor[BGW_SENSOR_ZACCEL].desc));
sc->sc_sensor[BGW_SENSOR_TEMP].type = SENSOR_TEMP;
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
for (i = 0; i < BGW_NUM_SENSORS; i++)
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
sensordev_install(&sc->sc_sensordev);
if (sensor_task_register(sc, bgw_refresh, 5) == NULL) {
printf(", unable to register update task\n");
return;
}
printf("\n");
}
void
bgw_refresh(void *arg)
{
struct bgw_softc *sc = arg;
uint8_t cmd, data[7];
uint8_t lsb;
int8_t msb;
int8_t temp;
int i;
iic_acquire_bus(sc->sc_tag, 0);
cmd = ACCD_X_LSB;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
for (i = 0; i < BGW_NUM_SENSORS; i++)
sc->sc_sensor[i].flags |= SENSOR_FINVALID;
return;
}
iic_release_bus(sc->sc_tag, 0);
lsb = data[ACCD_X_LSB - ACCD_X_LSB];
msb = data[ACCD_X_MSB - ACCD_X_LSB];
sc->sc_sensor[BGW_SENSOR_XACCEL].value = (msb << 4) | (lsb >> 4);
sc->sc_sensor[BGW_SENSOR_XACCEL].flags &= ~SENSOR_FINVALID;
lsb = data[ACCD_Y_LSB - ACCD_X_LSB];
msb = data[ACCD_Y_MSB - ACCD_X_LSB];
sc->sc_sensor[BGW_SENSOR_YACCEL].value = (msb << 4) | (lsb >> 4);
sc->sc_sensor[BGW_SENSOR_YACCEL].flags &= ~SENSOR_FINVALID;
lsb = data[ACCD_Z_LSB - ACCD_X_LSB];
msb = data[ACCD_Z_MSB - ACCD_X_LSB];
sc->sc_sensor[BGW_SENSOR_ZACCEL].value = (msb << 4) | (lsb >> 4);
sc->sc_sensor[BGW_SENSOR_ZACCEL].flags &= ~SENSOR_FINVALID;
temp = data[ACCD_TEMP - ACCD_X_LSB];
sc->sc_sensor[BGW_SENSOR_TEMP].value =
273150000 + (sc->sc_temp0 + temp) * 1000000;
sc->sc_sensor[BGW_SENSOR_TEMP].flags &= ~SENSOR_FINVALID;
}
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