/* $NetBSD: psoc.c,v 1.9 2025/09/17 14:15:59 thorpej Exp $ */

/*-
 * Copyright (c) 2019 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.
 */

/*
 * fan controller found in 1GHz TiBook
 *
 * register values from OF:
 * fan1 - 0x20 ( status ), 0x31 ( data )
 * fan2 - 0x26 ( status ), 0x45 ( data )
 * fan status byte 0:
 * 0x5* - fan is running, 0x6* - fan stopped
 * byte 1: unknown, 0x80 seems always set, lower bits seem to fluctuate
 * byte 2: lower 6 bit seem to indicate speed
 * fan speed may be lower 6 bit of byte 2 and lower 6 of byte 1 
 * temperature sensors start at 6, two bytes each, first appears to be
 * the temperature in degrees Celsius
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: psoc.c,v 1.9 2025/09/17 14:15:59 thorpej Exp $");

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

#include <dev/ofw/openfirm.h>

#include <dev/i2c/i2cvar.h>

#include <dev/sysmon/sysmonvar.h>

#include "opt_psoc.h"
#ifdef PSOC_DEBUG
#define DPRINTF printf
#else
#define DPRINTF if (0) printf
#endif

struct psoc_softc {
        device_t        sc_dev;
        i2c_tag_t       sc_i2c;
        i2c_addr_t      sc_addr;
        int             sc_node;

        struct sysmon_envsys *sc_sme;
        envsys_data_t   sc_sensors[7];
        int             sc_nsensors;
        uint8_t         sc_temp[16];
        time_t          sc_last;
};

static int      psoc_match(device_t, cfdata_t, void *);
static void     psoc_attach(device_t, device_t, void *);

static void     psoc_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);

static void     psoc_dump(struct psoc_softc *);

CFATTACH_DECL_NEW(psoc, sizeof(struct psoc_softc),
    psoc_match, psoc_attach, NULL, NULL);

static const struct device_compatible_entry compat_data[] = {
        { .compat = "Psoc" },
        DEVICE_COMPAT_EOL
};

static int
psoc_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;

        return 0;
}

static void
psoc_attach(device_t parent, device_t self, void *aux)
{
        struct psoc_softc *sc = device_private(self);
        struct i2c_attach_args *ia = aux;
        char path[256];
        envsys_data_t *s;
        int error, ih, r, i;

        sc->sc_dev = self;
        sc->sc_i2c = ia->ia_tag;
        sc->sc_addr = ia->ia_addr;
        sc->sc_node = devhandle_to_of(device_handle(self));
        sc->sc_last = 0;

        aprint_naive("\n");
        aprint_normal(": Psoc fan controller\n");

        error = OF_package_to_path(sc->sc_node, path, 256);
        path[error] = 0;
        DPRINTF("path [%s]\n", path);
        ih = OF_open("fan");
        OF_call_method_1("fan-init", ih, 0);
        DPRINTF("ih %08x\n", ih);

        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 = psoc_sensors_refresh;
        sc->sc_nsensors = 0;

        psoc_dump(sc);

        for (i = 0; i < 4; i++) {
                r = i * 2 + 6;
                s = &sc->sc_sensors[sc->sc_nsensors];
                s->state = ENVSYS_SINVALID;
                s->units = ENVSYS_STEMP;
                snprintf(s->desc, 16, "temp%d", i);
                s->private = r;
                sysmon_envsys_sensor_attach(sc->sc_sme, s);
                sc->sc_nsensors++;
        }

        for (r = 0x20; r < 0x2b; r += 0x06) {
                s = &sc->sc_sensors[sc->sc_nsensors];
                s->state = ENVSYS_SINVALID;
                s->units = ENVSYS_SFANRPM;
                snprintf(s->desc, 16, "reg %02x", r);
                s->private = r;
                sysmon_envsys_sensor_attach(sc->sc_sme, s);
                sc->sc_nsensors++;
        }

        sysmon_envsys_register(sc->sc_sme);
}

static void
psoc_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
        struct psoc_softc *sc = sme->sme_cookie;
        uint8_t cmd = 6;
        uint8_t buf[0x28];
        int error = 1, data;

        if ( edata->private < 0x20) {
                cmd = 0;
                if ((time_second - sc->sc_last) > 2) {
                        iic_acquire_bus(sc->sc_i2c, 0);
                        error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
                                    sc->sc_addr, &cmd, 1, sc->sc_temp, 16, 0);
                        iic_release_bus(sc->sc_i2c, 0);
                        if (error) return;
                        sc->sc_last = time_second;
                }
                error = 0;
                if (edata->private > 0) {
                        data = sc->sc_temp[edata->private];
                        /* Celsius -> microkelvin */
                        edata->value_cur = ((int)data * 1000000) + 273150000;
                }
#ifdef PSOC_DEBUG
                if (edata->private == 6)
                        psoc_dump(sc);
#endif
        } else {
                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, buf, 3, 0);
                iic_release_bus(sc->sc_i2c, 0);
                if (error) return;
                switch (buf[0] & 0xf0) {
                        case 0x50:
                                data = buf[edata->private - 0x20];
                                edata->value_cur = ((buf[2] & 0x3f) << 6) |
                                                    (buf[1] & 0x3f);
                                break;
                        case 0x60:
                                edata->value_cur = 0;
                                break;
                        default:
                                error = 0;
                }       
        }
        if (error) {
                edata->state = ENVSYS_SINVALID;
        } else {
                edata->state = ENVSYS_SVALID;
        }
}

static void
psoc_dump(struct psoc_softc *sc)
{
        int i, j;
        uint8_t data, cmd;

        iic_acquire_bus(sc->sc_i2c, 0);
        for (i = 0x20; i < 0x5f; i+= 8) {
                printf("%02x:", i);
                for (j = 0; j < 8; j++) {
                        cmd = i + j;
                        data = 0;
                        iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
                            sc->sc_addr, &cmd, 1, &data, 1, 0);
                        printf(" %02x", data);
                }
                printf("\n");
        }
        iic_release_bus(sc->sc_i2c, 0);
}