/*      $OpenBSD: fins.c,v 1.1 2008/03/19 19:33:09 deraadt Exp $        */
/*      $NetBSD: finsio_isa.c,v 1.9 2022/06/29 15:56:58 mlelstv Exp $   */

/*
 * Copyright (c) 2008 Juan Romero Pardines
 * Copyright (c) 2007, 2008 Geoff Steckel
 * Copyright (c) 2005, 2006 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: finsio_isa.c,v 1.9 2022/06/29 15:56:58 mlelstv Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/module.h>
#include <sys/bus.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>

#include <dev/sysmon/sysmonvar.h>

/* Derived from LM78 code. Only handles chips attached to ISA bus */

/*
 * Fintek F71805/F71883 Super I/O datasheets:
 * http://www.fintek.com.tw/files/productfiles/F71805F_V025.pdf
 * http://www.fintek.com.tw/files/productfiles/F71883_V026P.pdf
 *
 * This chip is a multi-io chip with many functions.
 * Each function may be relocated in I/O space by the BIOS.
 * The base address (2E or 4E) accesses a configuration space which
 * has pointers to the individual functions. The config space must be
 * unlocked with a cookie and relocked afterwards. The chip ID is stored
 * in config space so it is not normally visible.
 *
 * The voltage dividers specified are from reading the chips on one board.
 * There is no way to determine what they are in the general case.
 */

#define FINSIO_UNLOCK   0x87    /* magic constant - write 2x to select chip */
#define FINSIO_LOCK     0xaa    /* magic constant - write 1x to deselect reg */

#define FINSIO_FUNC_SEL 0x07    /* select which subchip to access */
#  define FINSIO_FUNC_HWMON 0x4

/* ISA registers index to an internal register space on chip */
#define FINSIO_DECODE_SIZE (8)
#define FINSIO_DECODE_MASK (FINSIO_DECODE_SIZE - 1)
#define FINSIO_ADDR     5       /* global configuration index */
#define FINSIO_DATA     6       /* and data registers */

/* Global configuration registers */
#define FINSIO_MANUF    0x23    /* manufacturer ID */
# define FINTEK_ID      0x1934
#define FINSIO_CHIP     0x20    /* chip ID */
# define FINSIO_IDF71805        0x0406
# define FINSIO_IDF71806        0x0341  /* F71872 and F1806 F/FG */
# define FINSIO_IDF71883        0x0541  /* F71882 and F1883 */
# define FINSIO_IDF71862        0x0601  /* F71862FG */
# define FINSIO_IDF8000         0x0581  /* F8000 */

/* in bank sensors of config space */
#define FINSIO_SENSADDR 0x60    /* sensors assigned I/O address (2 bytes) */

#define FINSIO_HWMON_CONF       0x01    /* Hardware Monitor Config. Register */

/* in sensors space */
#define FINSIO_TMODE    0x01    /* temperature mode reg */

#define FINSIO_MAX_SENSORS      20
/*
 * Fintek chips typically measure voltages using 8mv steps.
 * To measure higher voltages the input is attenuated with (external)
 * resistors.  Negative voltages are measured using inverting op amps
 * and resistors.  So we have to convert the sensor values back to
 * real voltages by applying the appropriate resistor factor.
 */
#define FRFACT_NONE     8000
#define FRFACT(x, y)    (FRFACT_NONE * ((x) + (y)) / (y))
#define FNRFACT(x, y)   (-FRFACT_NONE * (x) / (y))

#if defined(FINSIODEBUG)
#define DPRINTF(x)              do { printf x; } while (0)
#else
#define DPRINTF(x)
#endif

struct finsio_softc {
        bus_space_tag_t sc_iot;
        bus_space_handle_t sc_ioh;

        struct sysmon_envsys *sc_sme;
        envsys_data_t sc_sensor[FINSIO_MAX_SENSORS];
        struct finsio_sensor *sc_finsio_sensors;

        u_int sc_tempsel;
};

struct finsio_sensor {
        const char *fs_desc;
        u_int fs_type;
        uint8_t fs_aux;
        uint8_t fs_reg;
        void (*fs_refresh)(struct finsio_softc *, envsys_data_t *);
        int fs_rfact;
};

static int      finsio_isa_match(device_t, cfdata_t, void *);
static void     finsio_isa_attach(device_t, device_t, void *);
static int      finsio_isa_detach(device_t, int);

static void     finsio_enter(bus_space_tag_t, bus_space_handle_t);
static void     finsio_exit(bus_space_tag_t, bus_space_handle_t);
static uint8_t  finsio_readreg(bus_space_tag_t, bus_space_handle_t, int);
static void     finsio_writereg(bus_space_tag_t, bus_space_handle_t, int, int);

static void     finsio_refresh(struct sysmon_envsys *, envsys_data_t *);
static void     finsio_refresh_volt(struct finsio_softc *, envsys_data_t *);
static void     finsio_refresh_temp(struct finsio_softc *, envsys_data_t *);
static void     finsio_refresh_fanrpm(struct finsio_softc *, envsys_data_t *);

CFATTACH_DECL_NEW(finsio, sizeof(struct finsio_softc),
    finsio_isa_match, finsio_isa_attach, finsio_isa_detach, NULL);

/* Sensors available in F71805/F71806 */
static struct finsio_sensor f71805_sensors[] = {
        /* Voltage */
        { 
                .fs_desc = "+3.3V",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x10,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(100, 100)
        },
        {
                .fs_desc = "Vtt",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x11,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT_NONE
        },
        {
                .fs_desc = "Vram",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x12,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(100, 100)
        },
        {
                .fs_desc = "Vchips",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x13,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(47, 100)
        },
        {
                .fs_desc = "+5V",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x14,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 47)
        },
        {
                .fs_desc = "+12V",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x15,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 20)
        },
        {
                .fs_desc = "Vcc 1.5V",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x16,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT_NONE
        },
        {
                .fs_desc = "VCore",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x17,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT_NONE
        },
        {
                .fs_desc = "Vsb",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x18,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 47)
        },
        {
                .fs_desc = "Vsbint",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x19,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 47)
        },
        {
                .fs_desc = "Vbat",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x1a,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 47)
        },
        /* Temperature */
        {
                .fs_desc = "Temp1",
                .fs_type = ENVSYS_STEMP,
                .fs_aux = 0x01,
                .fs_reg = 0x1b,
                .fs_refresh = finsio_refresh_temp,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Temp2",
                .fs_type = ENVSYS_STEMP,
                .fs_aux = 0x02,
                .fs_reg = 0x1c,
                .fs_refresh = finsio_refresh_temp,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Temp3",
                .fs_type = ENVSYS_STEMP,
                .fs_aux = 0x04,
                .fs_reg = 0x1d,
                .fs_refresh = finsio_refresh_temp,
                .fs_rfact = 0
        },
        /* Fans */
        {
                .fs_desc = "Fan1",
                .fs_type = ENVSYS_SFANRPM,
                .fs_aux = 0,
                .fs_reg = 0x20,
                .fs_refresh = finsio_refresh_fanrpm,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Fan2",
                .fs_type = ENVSYS_SFANRPM,
                .fs_aux = 0,
                .fs_reg = 0x22,
                .fs_refresh = finsio_refresh_fanrpm,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Fan3",
                .fs_type = ENVSYS_SFANRPM,
                .fs_aux = 0,
                .fs_reg = 0x24,
                .fs_refresh = finsio_refresh_fanrpm,
                .fs_rfact = 0
        },

        {       .fs_desc = NULL }
};

/* Sensors available in F71862/F71882/F71883 */
static struct finsio_sensor f71883_sensors[] = {
        /* Voltage */
        {
                .fs_desc = "+3.3V",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x20,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(100, 100)
        },
        {
                .fs_desc = "Vcore",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x21,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT_NONE
        },
        {
                .fs_desc = "VIN2",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x22,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(100, 100)
        },
        {
                .fs_desc = "VIN3",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x23,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(47, 100)
        },
        {
                .fs_desc = "VIN4",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x24,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 47)
        },
        {
                .fs_desc = "VIN5",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x25,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 20)
        },
        {
                .fs_desc = "VIN6",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x26,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(100, 100)
        },
        {
                .fs_desc = "VSB +3.3V",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x27,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 47)
        },
        {
                .fs_desc = "VBAT",
                .fs_type = ENVSYS_SVOLTS_DC,
                .fs_aux = 0,
                .fs_reg = 0x28,
                .fs_refresh = finsio_refresh_volt,
                .fs_rfact = FRFACT(200, 47)
        },
        /* Temperature */
        {
                .fs_desc = "Temp1",
                .fs_type = ENVSYS_STEMP,
                .fs_aux = 0x1,
                .fs_reg = 0x72,
                .fs_refresh = finsio_refresh_temp,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Temp2",
                .fs_type = ENVSYS_STEMP,
                .fs_aux = 0x2,
                .fs_reg = 0x74,
                .fs_refresh = finsio_refresh_temp,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Temp3",
                .fs_type = ENVSYS_STEMP,
                .fs_aux = 0x4,
                .fs_reg = 0x76,
                .fs_refresh = finsio_refresh_temp,
                .fs_rfact = 0
        },
        /* Fan */
        {
                .fs_desc = "Fan1",
                .fs_type = ENVSYS_SFANRPM,
                .fs_aux = 0,
                .fs_reg = 0xa0,
                .fs_refresh = finsio_refresh_fanrpm,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Fan2",
                .fs_type = ENVSYS_SFANRPM,
                .fs_aux = 0,
                .fs_reg = 0xb0,
                .fs_refresh = finsio_refresh_fanrpm,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Fan3",
                .fs_type = ENVSYS_SFANRPM,
                .fs_aux = 0,
                .fs_reg = 0xc0,
                .fs_refresh = finsio_refresh_fanrpm,
                .fs_rfact = 0
        },
        {
                .fs_desc = "Fan4",
                .fs_type = ENVSYS_SFANRPM,
                .fs_aux = 0,
                .fs_reg = 0xd0,
                .fs_refresh = finsio_refresh_fanrpm,
                .fs_rfact = 0
        },

        {       .fs_desc = NULL }
};

static int
finsio_isa_match(device_t parent, cfdata_t match, void *aux)
{
        struct isa_attach_args *ia = aux;
        bus_space_handle_t ioh;
        uint16_t val;

        /* Must supply an address */
        if (ia->ia_nio < 1)
                return 0;

        if (ISA_DIRECT_CONFIG(ia))
                return 0;

        if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
                return 0;

        if (bus_space_map(ia->ia_iot, ia->ia_io[0].ir_addr, 2, 0, &ioh))
                return 0;

        finsio_enter(ia->ia_iot, ioh);
        /* Find out Manufacturer ID */
        val = finsio_readreg(ia->ia_iot, ioh, FINSIO_MANUF) << 8;
        val |= finsio_readreg(ia->ia_iot, ioh, FINSIO_MANUF + 1);
        finsio_exit(ia->ia_iot, ioh);
        bus_space_unmap(ia->ia_iot, ioh, 2);

        if (val != FINTEK_ID)
                return 0;

        ia->ia_nio = 1;
        ia->ia_io[0].ir_size = 2;
        ia->ia_niomem = 0;
        ia->ia_nirq = 0;
        ia->ia_ndrq = 0;

        return 1;
}

static void
finsio_isa_attach(device_t parent, device_t self, void *aux)
{
        struct finsio_softc *sc = device_private(self);
        struct isa_attach_args *ia = aux;
        bus_space_handle_t ioh;
        uint16_t hwmon_baddr, chipid, cr;
        int i, rv = 0;

        aprint_naive("\n");

        sc->sc_iot = ia->ia_iot;

        /* Map Super I/O configuration space */
        if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr, 2, 0, &ioh)) {
                aprint_error(": can't map configuration I/O space\n");
                return;
        }

        finsio_enter(sc->sc_iot, ioh);
        /* Get the Chip ID */
        chipid = finsio_readreg(sc->sc_iot, ioh, FINSIO_CHIP) << 8;
        chipid |= finsio_readreg(sc->sc_iot, ioh, FINSIO_CHIP + 1);
        /* 
         * Select the Hardware Monitor LDN to find out the I/O
         * address space.
         */
        finsio_writereg(sc->sc_iot, ioh, FINSIO_FUNC_SEL, FINSIO_FUNC_HWMON);
        hwmon_baddr = finsio_readreg(sc->sc_iot, ioh, FINSIO_SENSADDR) << 8;
        hwmon_baddr |= finsio_readreg(sc->sc_iot, ioh, FINSIO_SENSADDR + 1);
        finsio_exit(sc->sc_iot, ioh);
        bus_space_unmap(sc->sc_iot, ioh, 2);

        /*
         * The address decoder ignores the bottom 3 bits, so do we.
         */
        hwmon_baddr &= ~FINSIO_DECODE_MASK;

        switch (chipid) {
        case FINSIO_IDF71805:
                sc->sc_finsio_sensors = f71805_sensors;
                aprint_normal(": Fintek F71805 Super I/O\n");
                break;
        case FINSIO_IDF71806:
                sc->sc_finsio_sensors = f71805_sensors;
                aprint_normal(": Fintek F71806/F71872 Super I/O\n");
                break;
        case FINSIO_IDF71862:
                sc->sc_finsio_sensors = f71883_sensors;
                aprint_normal(": Fintek F71862 Super I/O\n");
                break;
        case FINSIO_IDF71883:
                sc->sc_finsio_sensors = f71883_sensors;
                aprint_normal(": Fintek F71882/F71883 Super I/O\n");
                break;
        case FINSIO_IDF8000:
                sc->sc_finsio_sensors = f71883_sensors;
                aprint_normal(": ASUS F8000 Super I/O\n");
                break;
        default:
                /* 
                 * Unknown Chip ID, assume the same register layout
                 * than F71805 for now.
                 */
                sc->sc_finsio_sensors = f71805_sensors;
                aprint_normal(": Fintek Super I/O (unknown chip ID %x)\n",
                    chipid);
                break;
        }

        /* Map Hardware Monitor I/O space */
        if (bus_space_map(sc->sc_iot, hwmon_baddr, FINSIO_DECODE_SIZE,
            0, &sc->sc_ioh)) {
                aprint_error(": can't map hwmon I/O space\n");
                return;
        }

        /* 
         * Enable Hardware monitoring for fan/temperature and
         * voltage sensors.
         */
        cr = finsio_readreg(sc->sc_iot, sc->sc_ioh, FINSIO_HWMON_CONF);
        finsio_writereg(sc->sc_iot, sc->sc_ioh, FINSIO_HWMON_CONF, cr | 0x3);

        /* Find out the temperature mode */
        sc->sc_tempsel = finsio_readreg(sc->sc_iot, sc->sc_ioh, FINSIO_TMODE);

        /* 
         * Initialize and attach sensors with sysmon_envsys(9).
         */
        sc->sc_sme = sysmon_envsys_create();
        for (i = 0; sc->sc_finsio_sensors[i].fs_desc; i++) {
                sc->sc_sensor[i].state = ENVSYS_SINVALID;
                sc->sc_sensor[i].units = sc->sc_finsio_sensors[i].fs_type;
                if (sc->sc_sensor[i].units == ENVSYS_SVOLTS_DC)
                        sc->sc_sensor[i].flags = ENVSYS_FCHANGERFACT;
                strlcpy(sc->sc_sensor[i].desc, sc->sc_finsio_sensors[i].fs_desc,
                        sizeof(sc->sc_sensor[i].desc));
                if (sysmon_envsys_sensor_attach(sc->sc_sme,
                                                &sc->sc_sensor[i]))
                        goto fail;
        }

        sc->sc_sme->sme_name = device_xname(self);
        sc->sc_sme->sme_cookie = sc;
        sc->sc_sme->sme_refresh = finsio_refresh;
        if ((rv = sysmon_envsys_register(sc->sc_sme))) {
                aprint_error(": unable to register with sysmon (%d)\n", rv);
                goto fail;
        }

        aprint_normal_dev(self,
            "Hardware Monitor registers at 0x%x\n", hwmon_baddr);
        return;

fail:
        sysmon_envsys_destroy(sc->sc_sme);
        sc->sc_sme = NULL;
        bus_space_unmap(sc->sc_iot, sc->sc_ioh, FINSIO_DECODE_SIZE);
}

static int
finsio_isa_detach(device_t self, int flags)
{
        struct finsio_softc *sc = device_private(self);

        if (sc->sc_sme != NULL)
                sysmon_envsys_unregister(sc->sc_sme);
        bus_space_unmap(sc->sc_iot, sc->sc_ioh, FINSIO_DECODE_SIZE);
        return 0;
}

/* Enter Super I/O configuration mode */
static void
finsio_enter(bus_space_tag_t iot, bus_space_handle_t ioh)
{
        bus_space_write_1(iot, ioh, FINSIO_ADDR, FINSIO_UNLOCK);
        bus_space_write_1(iot, ioh, FINSIO_ADDR, FINSIO_UNLOCK);
}

/* Exit Super I/O configuration mode */
static void
finsio_exit(bus_space_tag_t iot, bus_space_handle_t ioh)
{
        bus_space_write_1(iot, ioh, FINSIO_ADDR, FINSIO_LOCK);
}

static uint8_t
finsio_readreg(bus_space_tag_t iot, bus_space_handle_t ioh, int reg)
{
        bus_space_write_1(iot, ioh, FINSIO_ADDR, reg);
        return bus_space_read_1(iot, ioh, FINSIO_DATA);
}

static void
finsio_writereg(bus_space_tag_t iot, bus_space_handle_t ioh, int reg, int val)
{
        bus_space_write_1(iot, ioh, FINSIO_ADDR, reg);
        bus_space_write_1(iot, ioh, FINSIO_DATA, val);
}

static void
finsio_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
        struct finsio_softc *sc = sme->sme_cookie;
        int i = edata->sensor;

        sc->sc_finsio_sensors[i].fs_refresh(sc, edata);
}

static void
finsio_refresh_volt(struct finsio_softc *sc, envsys_data_t *edata)
{
        struct finsio_sensor *fs = &sc->sc_finsio_sensors[edata->sensor];
        int data;

        data = finsio_readreg(sc->sc_iot, sc->sc_ioh, fs->fs_reg);
        DPRINTF(("%s: data 0x%x\n", __func__, data));

        if (data == 0xff || data == 0)
                edata->state = ENVSYS_SINVALID;
        else {
                edata->state = ENVSYS_SVALID;
                if (edata->rfact)
                        edata->value_cur = data * edata->rfact;
                else
                        edata->value_cur = data * fs->fs_rfact;
        }
}

/* The BIOS seems to add a fudge factor to the CPU temp of +5C */
static void
finsio_refresh_temp(struct finsio_softc *sc, envsys_data_t *edata)
{
        struct finsio_sensor *fs = &sc->sc_finsio_sensors[edata->sensor];
        u_int data;
        u_int llmax;

        /*
         * The data sheet says that the range of the temperature
         * sensor is between 0 and 127 or 140 degrees C depending on
         * what kind of sensor is used.
         * A disconnected sensor seems to read over 110 or so.
         */
        data = finsio_readreg(sc->sc_iot, sc->sc_ioh, fs->fs_reg) & 0xFF;
        DPRINTF(("%s: data 0x%x\n", __func__, data));

        llmax = (sc->sc_tempsel & fs->fs_aux) ? 111 : 128;
        if (data == 0 || data >= llmax)         /* disconnected? */
                edata->state = ENVSYS_SINVALID;
        else {
                edata->state = ENVSYS_SVALID;
                edata->value_cur = data * 1000000 + 273150000;
        }
}

/* fan speed appears to be a 12-bit number */
static void
finsio_refresh_fanrpm(struct finsio_softc *sc, envsys_data_t *edata)
{
        struct finsio_sensor *fs = &sc->sc_finsio_sensors[edata->sensor];
        int data;

        data = finsio_readreg(sc->sc_iot, sc->sc_ioh, fs->fs_reg) << 8;
        data |= finsio_readreg(sc->sc_iot, sc->sc_ioh, fs->fs_reg + 1);
        DPRINTF(("%s: data 0x%x\n", __func__, data));

        if (data >= 0xfff)
                edata->state = ENVSYS_SINVALID;
        else {
                edata->value_cur = 1500000 / data;
                edata->state = ENVSYS_SVALID;
        }
}

MODULE(MODULE_CLASS_DRIVER, finsio, "sysmon_envsys");

#ifdef _MODULE
#include "ioconf.c"
#endif

static int
finsio_modcmd(modcmd_t cmd, void *opaque)
{
        int error = 0;

        switch (cmd) {
        case MODULE_CMD_INIT:
#ifdef _MODULE
                error = config_init_component(cfdriver_ioconf_finsio,
                    cfattach_ioconf_finsio, cfdata_ioconf_finsio);
#endif
                return error;
        case MODULE_CMD_FINI:
#ifdef _MODULE
                error = config_fini_component(cfdriver_ioconf_finsio,
                    cfattach_ioconf_finsio, cfdata_ioconf_finsio);
#endif
                return error;
        default:
                return ENOTTY;
        }
}