/* $NetBSD: resetbtn.c,v 1.1 2026/01/09 22:54:30 jmcneill Exp $ */

/*-
 * Copyright (c) 2024 Jared 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 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: resetbtn.c,v 1.1 2026/01/09 22:54:30 jmcneill Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <powerpc/pio.h>
#include <machine/wii.h>
#include <machine/wiiu.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>

#include "ahb.h"

#define PI_INTERRUPT_CAUSE      0x0c003000
#define  RESET_SWITCH_STATE     __BIT(16)

static int      resetbtn_match(device_t, cfdata_t, void *);
static void     resetbtn_attach(device_t, device_t, void *);

static int      resetbtn_intr(void *);
static void     resetbtn_task(void *);
static void     resetbtn_critpoll(void *);

CFATTACH_DECL_NEW(resetbtn, sizeof(struct sysmon_pswitch),
        resetbtn_match, resetbtn_attach, NULL, NULL);

static int
resetbtn_match(device_t parent, cfdata_t cf, void *aux)
{
        return !wiiu_plat;
}

static void
resetbtn_attach(device_t parent, device_t self, void *aux)
{
        struct ahb_attach_args *aaa = aux;
        struct sysmon_pswitch *smpsw = device_private(self);
        int error;

        KASSERT(device_unit(self) == 0);

        aprint_naive("\n");
        aprint_normal(": Reset button\n");

        critpollhook_establish(resetbtn_critpoll, NULL);

        sysmon_task_queue_init();

        smpsw->smpsw_name = device_xname(self);
        smpsw->smpsw_type = PSWITCH_TYPE_RESET;
        error = sysmon_pswitch_register(smpsw);
        if (error != 0) {
                aprint_error_dev(self,
                    "unable to register reset button with sysmon: %d\n", error);
                smpsw = NULL;
        }

        ahb_intr_establish(aaa->aaa_irq, IPL_HIGH, resetbtn_intr, smpsw,
            device_xname(self));
}

static int
resetbtn_intr(void *arg)
{
        struct sysmon_pswitch *smpsw = arg;

        sysmon_task_queue_sched(0, resetbtn_task, smpsw);

        return 1;
}

static void
resetbtn_task(void *arg)
{
        struct sysmon_pswitch *smpsw = arg;
        bool pressed;

        pressed = (in32(PI_INTERRUPT_CAUSE) & RESET_SWITCH_STATE) == 0;

        if (smpsw != NULL) {
                sysmon_pswitch_event(smpsw,
                    pressed ? PSWITCH_EVENT_PRESSED : PSWITCH_EVENT_RELEASED);
        } else if (!pressed) {
                kern_reboot(0, NULL);
        }
}

static void
resetbtn_critpoll(void *arg)                                                  
{
        if ((in32(PI_INTERRUPT_CAUSE) & RESET_SWITCH_STATE) == 0) {
                out32(HW_RESETS, in32(HW_RESETS) & ~RSTBINB);
        }
}