/*      $NetBSD: nslu2_buttons.c,v 1.4 2012/10/14 14:20:58 msaitoh Exp $        */

/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Steve C. Woodford.
*
* 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: nslu2_buttons.c,v 1.4 2012/10/14 14:20:58 msaitoh Exp $");

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

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

#include <arm/xscale/ixp425reg.h>
#include <arm/xscale/ixp425var.h>

#include <evbarm/nslu2/nslu2reg.h>

struct slugbutt_softc {
       device_t sc_dev;
       struct sysmon_pswitch sc_smpwr;
       struct sysmon_pswitch sc_smrst;
};

static int slugbutt_attached;

#define SLUGBUTT_PWR_BIT        (1u << GPIO_BUTTON_PWR)
#define SLUGBUTT_RST_BIT        (1u << GPIO_BUTTON_RST)

static void
power_event(void *arg)
{
       struct slugbutt_softc *sc = arg;

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

static int
power_intr(void *arg)
{
       struct slugbutt_softc *sc = arg;
       int rv;

       GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPISR, SLUGBUTT_PWR_BIT);

       rv = sysmon_task_queue_sched(0, power_event, sc);
       if (rv) {
               printf("%s: WARNING: unable to queue power button "
                   "callback: %d\n", device_xname(sc->sc_dev), rv);
       }

       return (1);
}

static void
reset_event(void *arg)
{
       struct slugbutt_softc *sc = arg;

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

static int
reset_intr(void *arg)
{
       struct slugbutt_softc *sc = arg;
       int rv;

       GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPISR, SLUGBUTT_RST_BIT);

       rv = sysmon_task_queue_sched(0, reset_event, sc);
       if (rv) {
               printf("%s: WARNING: unable to queue reset button "
                   "callback: %d\n", device_xname(sc->sc_dev), rv);
       }

       return (1);
}

static void
slugbutt_deferred(device_t self)
{
       struct slugbutt_softc *sc = device_private(self);
       struct ixp425_softc *ixsc = ixp425_softc;
       uint32_t reg;

       sc->sc_dev = self;

       /* Configure the GPIO pins as inputs */
       reg = GPIO_CONF_READ_4(ixsc, IXP425_GPIO_GPOER);
       reg |= SLUGBUTT_PWR_BIT | SLUGBUTT_RST_BIT;
       GPIO_CONF_WRITE_4(ixsc, IXP425_GPIO_GPOER, reg);

       /* Configure the input type: Falling edge */
       reg = GPIO_CONF_READ_4(ixsc, GPIO_TYPE_REG(GPIO_BUTTON_PWR));
       reg &= ~GPIO_TYPE(GPIO_BUTTON_PWR, GPIO_TYPE_MASK);
       reg |= GPIO_TYPE(GPIO_BUTTON_PWR, GPIO_TYPE_EDG_FALLING);
       GPIO_CONF_WRITE_4(ixsc, GPIO_TYPE_REG(GPIO_BUTTON_PWR), reg);

       reg = GPIO_CONF_READ_4(ixsc, GPIO_TYPE_REG(GPIO_BUTTON_RST));
       reg &= ~GPIO_TYPE(GPIO_BUTTON_RST, GPIO_TYPE_MASK);
       reg |= GPIO_TYPE(GPIO_BUTTON_RST, GPIO_TYPE_EDG_FALLING);
       GPIO_CONF_WRITE_4(ixsc, GPIO_TYPE_REG(GPIO_BUTTON_RST), reg);

       /* Clear any existing interrupt */
       GPIO_CONF_WRITE_4(ixsc, IXP425_GPIO_GPISR, SLUGBUTT_PWR_BIT |
           SLUGBUTT_RST_BIT);

       sysmon_task_queue_init();

       sc->sc_smpwr.smpsw_name = device_xname(sc->sc_dev);
       sc->sc_smpwr.smpsw_type = PSWITCH_TYPE_POWER;

       if (sysmon_pswitch_register(&sc->sc_smpwr) != 0) {
               printf("%s: unable to register power button with sysmon\n",
                   device_xname(sc->sc_dev));
               return;
       }

       sc->sc_smrst.smpsw_name = device_xname(sc->sc_dev);
       sc->sc_smrst.smpsw_type = PSWITCH_TYPE_RESET;

       if (sysmon_pswitch_register(&sc->sc_smrst) != 0) {
               printf("%s: unable to register reset button with sysmon\n",
                   device_xname(sc->sc_dev));
               return;
       }

       /* Hook the interrupts */
       ixp425_intr_establish(BUTTON_PWR_INT, IPL_TTY, power_intr, sc);
       ixp425_intr_establish(BUTTON_RST_INT, IPL_TTY, reset_intr, sc);
}


static int
slugbutt_match(device_t parent, cfdata_t cf, void *aux)
{

       return (slugbutt_attached == 0);
}

static void
slugbutt_attach(device_t parent, device_t self, void *aux)
{

       slugbutt_attached = 1;

       aprint_normal(": Power and Reset buttons\n");

       /* Defer, to ensure ixp425_softc has been initialised */
       config_interrupts(self, slugbutt_deferred);
}

CFATTACH_DECL_NEW(slugbutt, sizeof(struct slugbutt_softc),
   slugbutt_match, slugbutt_attach, NULL, NULL);

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