/*      $NetBSD: psh3pwr.c,v 1.8 2024/09/20 19:32:19 andvar Exp $       */
/*
 * Copyright (c) 2005, 2007 KIYOHARA Takashi
 * 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 AUTHOR ``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 AUTHOR 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: psh3pwr.c,v 1.8 2024/09/20 19:32:19 andvar Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/callout.h>

#include <machine/config_hook.h>
#include <machine/platid.h>
#include <machine/platid_mask.h>

#include <dev/apm/apmbios.h>

#include <sh3/exception.h>
#include <sh3/intcreg.h>
#include <sh3/pfcreg.h>

#include <sh3/dev/adcvar.h>


#ifdef PSH3PWR_DEBUG
#define DPRINTF(arg)            printf arg
#else
#define DPRINTF(arg)            ((void)0)
#endif


/* A/D converter channels to get power stats from */
#define ADC_CHANNEL_BATTERY     3

/* On/Off bit for Green LED. pin 7 in SH7709 GPIO port H. */
#define PSH3_GREEN_LED_ON       0x80

/*
 * XXXX:
 *   WindowsCE seem to be using this as a flag.
 *   pin 6 in SH7709 GPIO port SCPDR.
 */
#define PSH3PWR_PLUG_OUT        0x40


static inline int __attribute__((__always_inline__))
psh3pwr_ac_is_off(void)
{

        return _reg_read_1(SH7709_SCPDR) & PSH3PWR_PLUG_OUT;
}


/*
 * Empirical range of battery values.
 * Thanks to Joseph Heenan for measurements.
 */
#define PSH3PWR_BATTERY_MIN             630
#define PSH3PWR_BATTERY_CRITICAL        635
#define PSH3PWR_BATTERY_LOW             645
#define PSH3PWR_BATTERY_FULL            910 /* can be slightly more */


struct psh3pwr_softc {
        device_t sc_dev;

        void *sc_ih_pin;
        void *sc_ih_pout;
};

static int psh3pwr_match(device_t, struct cfdata *, void *);
static void psh3pwr_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(psh3pwr, sizeof(struct psh3pwr_softc),
    psh3pwr_match, psh3pwr_attach, NULL, NULL);

static int psh3pwr_intr_plug_out(void *);
static int psh3pwr_intr_plug_in(void *);
static void psh3pwr_sleep(void *);
static int psh3pwr_apm_getpower_hook(void *, int, long, void *);
static int psh3pwr_get_battery(void);


static int
psh3pwr_match(device_t parent, struct cfdata *cfp, void *aux)
{

        if (!platid_match(&platid, &platid_mask_MACH_HITACHI_PERSONA))
                return 0;

        if (strcmp(cfp->cf_name, "psh3pwr") != 0)
                return 0;

        return 1;
}


static void
psh3pwr_attach(device_t parent, device_t self, void *aux)
{
        extern void (*__sleep_func)(void *);
        extern void *__sleep_ctx;
        struct psh3pwr_softc *sc = device_private(self);
        uint8_t phdr;

        sc->sc_dev = self;

        /* arrange for hpcapm to call us when power status is requested */
        config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_ACADAPTER,
            CONFIG_HOOK_EXCLUSIVE, psh3pwr_apm_getpower_hook, sc);
        config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_CHARGE,
            CONFIG_HOOK_EXCLUSIVE, psh3pwr_apm_getpower_hook, sc);
        config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_BATTERYVAL,
            CONFIG_HOOK_EXCLUSIVE, psh3pwr_apm_getpower_hook, sc);

        /* register sleep function to APM */
        __sleep_func = psh3pwr_sleep;
        __sleep_ctx = self;

        phdr = _reg_read_1(SH7709_PHDR);
        _reg_write_1(SH7709_PHDR, phdr | PSH3_GREEN_LED_ON);

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

        sc->sc_ih_pout = intc_intr_establish(SH7709_INTEVT2_IRQ0,
            IST_EDGE, IPL_TTY, psh3pwr_intr_plug_out, self);
        sc->sc_ih_pin = intc_intr_establish(SH7709_INTEVT2_IRQ1,
            IST_EDGE, IPL_TTY, psh3pwr_intr_plug_in, self);

        /* XXXX: WindowsCE sets this bit. */
        aprint_normal_dev(self, "plug status: %s\n",
            psh3pwr_ac_is_off() ? "out" : "in");

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "unable to establish power handler\n");
}


static int
psh3pwr_intr_plug_out(void *dev)
{
        uint8_t irr0, scpdr;

        irr0 = _reg_read_1(SH7709_IRR0);
        if (!(irr0 & IRR0_IRQ0)) {
                return 0;
        }
        _reg_write_1(SH7709_IRR0, irr0 & ~IRR0_IRQ0);

        /* XXXX: WindowsCE sets this bit. */
        scpdr = _reg_read_1(SH7709_SCPDR);
        _reg_write_1(SH7709_SCPDR, scpdr | PSH3PWR_PLUG_OUT);

        DPRINTF(("%s: plug out\n", device_xname(dev)));

        return 1;
}

static int
psh3pwr_intr_plug_in(void *dev)
{
        uint8_t irr0, scpdr;

        irr0 = _reg_read_1(SH7709_IRR0);
        if (!(irr0 & IRR0_IRQ1))
                return 0;
        _reg_write_1(SH7709_IRR0, irr0 & ~IRR0_IRQ1);

        /* XXXX: WindowsCE sets this bit. */
        scpdr = _reg_read_1(SH7709_SCPDR);
        _reg_write_1(SH7709_SCPDR, scpdr & ~PSH3PWR_PLUG_OUT);

        DPRINTF(("%s: plug in\n", device_xname(dev)));

        return 1;
}

void
psh3pwr_sleep(void *v)
{
        /* splhigh on entry */
        extern void pfckbd_poll_hitachi_power(void);

        uint8_t phdr;

        phdr = _reg_read_1(SH7709_PHDR);
        _reg_write_1(SH7709_PHDR, phdr & ~PSH3_GREEN_LED_ON);

        pfckbd_poll_hitachi_power();

        phdr = _reg_read_1(SH7709_PHDR);
        _reg_write_1(SH7709_PHDR, phdr | PSH3_GREEN_LED_ON);
}

static int
psh3pwr_apm_getpower_hook(void *ctx, int type, long id, void *msg)
{
        /* struct psh0pwr_softc * const sc = ctx; */
        int * const pval = msg;
        int battery, state;

        if (type != CONFIG_HOOK_GET)
                return EINVAL;

        switch (id) {

        case CONFIG_HOOK_ACADAPTER:
                *pval = psh3pwr_ac_is_off() ? APM_AC_OFF : APM_AC_ON;
                return 0;

        case CONFIG_HOOK_CHARGE:
                battery = psh3pwr_get_battery();
                if (battery < PSH3PWR_BATTERY_CRITICAL)
                        state = APM_BATT_FLAG_CRITICAL;
                else if (battery < PSH3PWR_BATTERY_LOW)
                        state = APM_BATT_FLAG_LOW;
                else
                        state = APM_BATT_FLAG_HIGH; /* XXX? */
                *pval = state;
                return 0;

        case CONFIG_HOOK_BATTERYVAL:
                battery = psh3pwr_get_battery();
                if (battery > PSH3PWR_BATTERY_FULL)
                        state = 100;
                else
                        state = 100 * (battery - PSH3PWR_BATTERY_MIN) /
                            (PSH3PWR_BATTERY_FULL - PSH3PWR_BATTERY_MIN);
                *pval = state;
                return 0;
        }

        return EINVAL;
}


static int
psh3pwr_get_battery(void)
{
        int battery;
        int s;

        s = spltty();
        battery = adc_sample_channel(ADC_CHANNEL_BATTERY);
        splx(s);

        return battery;
}