/* $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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