/* $NetBSD: axp22x.c,v 1.9 2021/01/27 02:29:48 thorpej Exp $ */

/*-
 * Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca>
 * 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: axp22x.c,v 1.9 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 <sys/kmem.h>

#include <dev/i2c/i2cvar.h>

#include <dev/sysmon/sysmonvar.h>

static const struct device_compatible_entry compat_data[] = {
        { .compat = "x-powers,axp221" },
        DEVICE_COMPAT_EOL
};

#define AXP_TEMP_MON_REG        0x56    /* 2 bytes */

struct axp22x_softc {
        device_t        sc_dev;
        i2c_tag_t       sc_i2c;
        i2c_addr_t      sc_addr;

        struct sysmon_envsys *sc_sme;
        envsys_data_t   sc_sensor_temp;
};

static int      axp22x_match(device_t, cfdata_t, void *);
static void     axp22x_attach(device_t, device_t, void *);

static void     axp22x_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
static int      axp22x_read(struct axp22x_softc *, uint8_t, uint8_t *, size_t);

CFATTACH_DECL_NEW(axp22x, sizeof(struct axp22x_softc),
    axp22x_match, axp22x_attach, NULL, NULL);

static int
axp22x_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;

        /* This device is direct-config only. */

        return 0;
}

static void
axp22x_attach(device_t parent, device_t self, void *aux)
{
        struct axp22x_softc *sc = device_private(self);
        struct i2c_attach_args *ia = aux;

        sc->sc_dev = self;
        sc->sc_i2c = ia->ia_tag;
        sc->sc_addr = ia->ia_addr;

        aprint_naive("\n");
        aprint_normal("\n");

        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 = axp22x_sensors_refresh;

        sc->sc_sensor_temp.units = ENVSYS_STEMP;
        sc->sc_sensor_temp.state = ENVSYS_SINVALID;
        sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY;
        snprintf(sc->sc_sensor_temp.desc, sizeof(sc->sc_sensor_temp.desc),
            "internal temperature");
        sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp);

        sysmon_envsys_register(sc->sc_sme);
}

static void
axp22x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
        struct axp22x_softc *sc = sme->sme_cookie;
        uint8_t buf[2];
        int error;

        iic_acquire_bus(sc->sc_i2c, 0);
        error = axp22x_read(sc, AXP_TEMP_MON_REG, buf, sizeof(buf));
        iic_release_bus(sc->sc_i2c, 0);

        if (error) {
                edata->state = ENVSYS_SINVALID;
        } else {
                /* between -243.7C and 165.8C, step +0.1C */
                edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2437)
                                   * 100000 + 273150000;
                edata->state = ENVSYS_SVALID;
        }
}

static int
axp22x_read(struct axp22x_softc *sc, uint8_t reg, uint8_t *val, size_t len)
{
        size_t i;
        int error;

        for (i = 0; i < len; i++) {
                error = iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr,
                    reg + i, &val[i], 0);
                if (error)
                        return error;
        }

        return 0;
}