/* $NetBSD: resetbtn.c,v 1.2 2024/01/23 21:56:07 jmcneill Exp $ */

/*-
* Copyright (c) 2024 Jared McNeill <[email protected]>
* 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 1.2 2024/01/23 21:56:07 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 <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>

#include "hollywood.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 *);

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 1;
}

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

       KASSERT(device_unit(self) == 0);

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

       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;
       }

       hollywood_intr_establish(haa->haa_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);
       }
}