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/* $NetBSD: asms.c,v 1.4 2021/01/27 02:29:48 thorpej Exp $ */
/*-
* Copyright (c) 2020 Michael Lorenz
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: asms.c,v 1.4 2021/01/27 02:29:48 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <dev/i2c/i2cvar.h>
#include <dev/sysmon/sysmonvar.h>
struct asms_softc {
device_t sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
struct sysmon_envsys *sc_sme;
envsys_data_t sc_sensors[3];
};
static int asms_match(device_t, cfdata_t, void *);
static void asms_attach(device_t, device_t, void *);
static void asms_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
static void asms_init(struct asms_softc *);
CFATTACH_DECL_NEW(asms, sizeof(struct asms_softc),
asms_match, asms_attach, NULL, NULL);
static const struct device_compatible_entry compat_data[] = {
{ .compat = "accelerometer" },
{ .compat = "AAPL,accelerometer_1" },
DEVICE_COMPAT_EOL
};
/* ASMS Registers, from OpenBSD */
#define ASMS_REG_COMMAND 0x00
#define ASMS_REG_STATUS 0x01
#define ASMS_REG_RCONTROL1 0x02
#define ASMS_REG_RCONTROL2 0x03
#define ASMS_REG_RCONTROL3 0x04
#define ASMS_REG_RDATA1 0x05
#define ASMS_REG_RDATA2 0x06
#define ASMS_REG_DATA_X 0x20
#define ASMS_REG_DATA_Y 0x21
#define ASMS_REG_DATA_Z 0x22
#define ASMS_REG_SENS_LOW 0x26 /* init with 0x15 */
#define ASMS_REG_SENS_HIGH 0x27 /* init with 0x60 */
#define ASMS_REG_CONTROL_X 0x28 /* init with 0x08 */
#define ASMS_REG_CONTROL_Y 0x29 /* init with 0x0f */
#define ASMS_REG_CONTROL_Z 0x2a /* init with 0x4f */
#define ASMS_REG_UNKNOWN1 0x2b /* init with 0x14 */
#define ASMS_REG_VENDOR 0x2e
#define ASMS_CMD_READ_VER 0x01
#define ASMS_CMD_READ_MEM 0x02
#define ASMS_CMD_RESET 0x07
#define ASMS_CMD_START 0x08
static int
asms_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
int match_result;
if (iic_use_direct_match(ia, match, compat_data, &match_result))
return match_result;
if ((ia->ia_addr & 0xf8) == 0xd8)
return I2C_MATCH_ADDRESS_ONLY;
return 0;
}
static void
asms_attach(device_t parent, device_t self, void *aux)
{
struct asms_softc *sc = device_private(self);
struct i2c_attach_args *ia = aux;
envsys_data_t *s;
sc->sc_dev = self;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
aprint_naive("\n");
aprint_normal(": Sudden Motion Sensor\n");
asms_init(sc);
sc->sc_sme = sysmon_envsys_create();
sc->sc_sme->sme_name = device_xname(self);
sc->sc_sme->sme_cookie = sc;
sc->sc_sme->sme_refresh = asms_sensors_refresh;
s = &sc->sc_sensors[0];
s->units = ENVSYS_INTEGER;
s->state = ENVSYS_SINVALID;
s->private = ASMS_REG_DATA_X;
strncpy(s->desc, "X", sizeof(s->desc));
sysmon_envsys_sensor_attach(sc->sc_sme, s);
s = &sc->sc_sensors[1];
s->units = ENVSYS_INTEGER;
s->state = ENVSYS_SINVALID;
s->private = ASMS_REG_DATA_Y;
strncpy(s->desc, "Y", sizeof(s->desc));
sysmon_envsys_sensor_attach(sc->sc_sme, s);
s = &sc->sc_sensors[2];
s->units = ENVSYS_INTEGER;
s->state = ENVSYS_SINVALID;
s->private = ASMS_REG_DATA_Z;
strncpy(s->desc, "Z", sizeof(s->desc));
sysmon_envsys_sensor_attach(sc->sc_sme, s);
sysmon_envsys_register(sc->sc_sme);
}
static void
asms_init(struct asms_softc *sc)
{
int error, i, j;
uint8_t cmd[2], data[48];
iic_acquire_bus(sc->sc_i2c, 0);
cmd[0] = ASMS_REG_COMMAND;
data[0] = ASMS_CMD_START;
error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, cmd, 1, data, 1, 0);
delay(10000);
cmd[0] = 0;
error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
sc->sc_addr, cmd, 1, data, 48, 0);
iic_release_bus(sc->sc_i2c, 0);
if (error != 0) {
aprint_error_dev(sc->sc_dev, "unable to read registers.\n");
return;
}
for (i = 0; i < 48; i += 8) {
printf("%02x:", i);
for (j =0; j < 8; j++) {
printf(" %02x", data[i + j]);
}
printf("\n");
}
}
static void
asms_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
struct asms_softc *sc = sme->sme_cookie;
uint8_t cmd = 0;
int8_t data = 0;
int error;
cmd = edata->private;
iic_acquire_bus(sc->sc_i2c, 0);
error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, 1, &data, 1, 0);
iic_release_bus(sc->sc_i2c, 0);
if (error) {
edata->state = ENVSYS_SINVALID;
} else {
edata->value_cur = (int)data;
edata->state = ENVSYS_SVALID;
}
}
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