/*      $OpenBSD: asc7611.c,v 1.3 2022/04/06 18:59:28 naddy Exp $       */

/*
 * Copyright (c) 2008 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>

/*
 * Andigilog aSC7611
 *      Hardware Monitor with Integrated Fan Control
 * http://www.andigilog.com/downloads/aSC7611_70A05007.pdf
 * October 2006
 */

/* Temperature */
#define ANDL_NUM_TEMPS  3
static const struct {
        const char      *name;
        const uint8_t   mreg;
        const uint8_t   lreg;
} andl_temp[ANDL_NUM_TEMPS] = {
        { "External", 0x25, 0x10 },
        { "Internal", 0x26, 0x15 },
        { "External", 0x27, 0x0e }
};

/* Voltage */
#define ANDL_NUM_VOLTS  5
static const struct {
        const char      *name;
        const short     nominal;
        const uint8_t   mreg;
} andl_volt[ANDL_NUM_VOLTS] = {
        { "+2.5V", 2500, 0x20 },
        { "Vccp", 2250, 0x21 },
        { "+3.3V", 3300, 0x22 },
        { "+5V", 5000, 0x23 },
        { "+12V", 12000, 0x24 }
};

/* Fan */
#define ANDL_NUM_TACHS  4
#define ANDL_TACH_START 0x28

#define ANDL_NUM_TOTAL  (ANDL_NUM_TEMPS + ANDL_NUM_VOLTS + ANDL_NUM_TACHS)

struct andl_softc {
        struct device   sc_dev;
        i2c_tag_t       sc_tag;
        i2c_addr_t      sc_addr;

        struct ksensor  sc_sensors[ANDL_NUM_TOTAL];
        struct ksensordev sc_sensordev;
};


int     andl_match(struct device *, void *, void *);
void    andl_attach(struct device *, struct device *, void *);
void    andl_refresh(void *);

int     andl_refresh_temps(struct andl_softc *, struct ksensor *);
int     andl_refresh_volts(struct andl_softc *, struct ksensor *);
int     andl_refresh_tachs(struct andl_softc *, struct ksensor *);

uint8_t andl_readreg(struct andl_softc *, uint8_t);
void    andl_writereg(struct andl_softc *, uint8_t, uint8_t);


const struct cfattach andl_ca = {
        sizeof(struct andl_softc), andl_match, andl_attach
};

struct cfdriver andl_cd = {
        NULL, "andl", DV_DULL
};


int
andl_match(struct device *parent, void *match, void *aux)
{
        struct i2c_attach_args *ia = aux;

        if (strcmp(ia->ia_name, "asc7611") == 0)
                return 1;
        return 0;
}

void
andl_attach(struct device *parent, struct device *self, void *aux)
{
        struct andl_softc *sc = (struct andl_softc *)self;
        struct i2c_attach_args *ia = aux;
        int i, j;

        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 < ANDL_NUM_TEMPS; i++) {
                strlcpy(sc->sc_sensors[i].desc, andl_temp[i].name,
                    sizeof(sc->sc_sensors[i].desc));
                sc->sc_sensors[i].type = SENSOR_TEMP;
        }

        for (j = i; i < j + ANDL_NUM_VOLTS; i++) {
                strlcpy(sc->sc_sensors[i].desc, andl_volt[i - j].name,
                    sizeof(sc->sc_sensors[i].desc));
                sc->sc_sensors[i].type = SENSOR_VOLTS_DC;
        }

        for (j = i + ANDL_NUM_TACHS; i < j; i++)
                sc->sc_sensors[i].type = SENSOR_FANRPM;

        for (i = 0; i < j; i++)
                sensor_attach(&sc->sc_sensordev, &sc->sc_sensors[i]);

        if (sensor_task_register(sc, andl_refresh, 5) == NULL) {
                printf(", unable to register update task\n");
                return;
        }

        sensordev_install(&sc->sc_sensordev);
        printf("\n");
}

void
andl_refresh(void *arg)
{
        struct andl_softc *sc = arg;
        struct ksensor *s = sc->sc_sensors;

        iic_acquire_bus(sc->sc_tag, 0);

        s += andl_refresh_temps(sc, s);
        s += andl_refresh_volts(sc, s);
        s += andl_refresh_tachs(sc, s);

        iic_release_bus(sc->sc_tag, 0);
}

int
andl_refresh_temps(struct andl_softc *sc, struct ksensor *s)
{
        int i;

        for (i = 0; i < ANDL_NUM_TEMPS; i++) {
                uint8_t m = andl_readreg(sc, andl_temp[i].mreg);
                uint8_t l = andl_readreg(sc, andl_temp[i].lreg);
                int32_t t = (m << 8 | l) >> (16 - 10);

                if (t & 0x200)
                        t -= 0x400;
                t *= 250;
                if (t < -55000 || t > 125000) {
                        s[i].flags |= SENSOR_FINVALID;
                        s[i].value = 0;
                } else {
                        s[i].value = t * 1000 + 273150000;
                        s[i].flags &= ~SENSOR_FINVALID;
                }
        }
        return i;
}

int
andl_refresh_volts(struct andl_softc *sc, struct ksensor *s)
{
        int i;

        for (i = 0; i < ANDL_NUM_VOLTS; i++)
                s[i].value = 1000ll * andl_readreg(sc, andl_volt[i].mreg) *
                    andl_volt[i].nominal / 0xc0;
        return i;
}

int
andl_refresh_tachs(struct andl_softc *sc, struct ksensor *s)
{
        int i;

        for (i = 0; i < ANDL_NUM_TACHS; i++) {
                uint8_t l = andl_readreg(sc, ANDL_TACH_START + i * 2);
                uint8_t m = andl_readreg(sc, ANDL_TACH_START + i * 2 + 1);
                uint16_t b = m << 8 | l;

                if (b >= 0xfffc || b == 0) {
                        s[i].flags |= SENSOR_FINVALID;
                        s[i].value = 0;
                } else {
                        s[i].value = (90000 * 60) / b;
                        s[i].flags &= ~SENSOR_FINVALID;
                }
        }
        return i;
}

uint8_t
andl_readreg(struct andl_softc *sc, uint8_t reg)
{
        uint8_t data;

        iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
            sc->sc_addr, &reg, sizeof reg, &data, sizeof data, 0);

        return data;
}

void
andl_writereg(struct andl_softc *sc, uint8_t reg, uint8_t data)
{
        iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
            sc->sc_addr, &reg, sizeof reg, &data, sizeof data, 0);
}