/*      $NetBSD: button.c,v 1.1 2018/04/09 20:07:22 christos Exp $ */

/*-
 * Copyright (c) 2009 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: button.c,v 1.1 2018/04/09 20:07:22 christos Exp $");

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

#include <sys/bus.h>

#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>

#include <machine/autoconf.h>
#include <machine/machtype.h>

#include <sgimips/ioc/iocreg.h>
#include <sgimips/hpc/hpcvar.h>
#include <sgimips/hpc/hpcreg.h>

struct button_softc {
        device_t sc_dev;
        struct sysmon_pswitch sc_pbutton;
        bus_space_tag_t sc_tag;
        bus_space_handle_t sc_hreg;
        int sc_last, sc_fired;
};

static int button_match(device_t, cfdata_t, void *);
static void button_attach(device_t, device_t, void *);

static int button_intr(void *);
static void button_powerbutton(void *);

CFATTACH_DECL_NEW(button, sizeof(struct button_softc), 
                                button_match, 
                                button_attach, 
                                NULL, 
                                NULL);

static int
button_match(device_t parent, cfdata_t match, void *aux)
{
        struct hpc_attach_args *ha = aux;

        if (strcmp(ha->ha_name, match->cf_name) != 0)
                return 0;

        if (mach_type == MACH_SGI_IP22)
                return 1;

        return 0;
}

static void
button_attach(device_t parent, device_t self, void *aux)
{
        struct button_softc *sc;
        struct hpc_attach_args *haa;

        sc = device_private(self);
        sc->sc_dev = self;
        haa = aux;
        sc->sc_tag = haa->ha_st;
        sc->sc_fired = 0;
        
        aprint_normal("\n");
        if (bus_space_subregion(haa->ha_st, haa->ha_sh, haa->ha_devoff,
                        0x4,            /* just a single register */
                        &sc->sc_hreg)) {
                aprint_error(": unable to map button register\n");
                return;
        }

        if ((cpu_intr_establish(haa->ha_irq, IPL_BIO,
             button_intr, sc)) == NULL) {
                printf(": unable to establish interrupt!\n");
                return;
        }

        sc->sc_last = 0;

        sysmon_task_queue_init();
        memset(&sc->sc_pbutton, 0, sizeof(struct sysmon_pswitch));
        sc->sc_pbutton.smpsw_name = device_xname(sc->sc_dev);
        sc->sc_pbutton.smpsw_type = PSWITCH_TYPE_POWER;
        if (sysmon_pswitch_register(&sc->sc_pbutton) != 0)
                aprint_error_dev(sc->sc_dev,
                    "unable to register power button with sysmon\n");
        pmf_device_register(self, NULL, NULL);
}

static int
button_intr(void *cookie)
{
        struct button_softc *sc = cookie;
        uint8_t reg;
        
        reg = bus_space_read_4(sc->sc_tag, sc->sc_hreg, 0);
        bus_space_write_4(sc->sc_tag, sc->sc_hreg, 0,
            IOC_PANEL_VDOWN_IRQ | IOC_PANEL_VUP_IRQ | IOC_PANEL_POWER_IRQ);
        if ((reg & IOC_PANEL_POWER_IRQ) == 0) {
                if (!sc->sc_fired)
                        sysmon_task_queue_sched(0, button_powerbutton, sc);
                sc->sc_fired = 1;
        }
        if (time_second == sc->sc_last)
                return 1;
        sc->sc_last = time_second;
        if ((reg & IOC_PANEL_VDOWN_HOLD) == 0)
                pmf_event_inject(NULL, PMFE_AUDIO_VOLUME_DOWN);
        if ((reg & IOC_PANEL_VUP_HOLD) == 0)
                pmf_event_inject(NULL, PMFE_AUDIO_VOLUME_UP);
        
        return 1;
}

static void
button_powerbutton(void *cookie)
{
        struct button_softc *sc = cookie;

        sysmon_pswitch_event(&sc->sc_pbutton, PSWITCH_EVENT_PRESSED);
}