/*
 * Copyright (C) 2001 The XFree86 Project, Inc.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the XFree86 Project
 * shall not be used in advertising or otherwise to promote the sale, use
 * or other dealings in this Software without prior written authorization
 * from the XFree86 Project.
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include <X11/X.h>
#include "os.h"
#include "xf86.h"
#include "xf86Priv.h"
#define XF86_OS_PRIVS
#include "xf86_OSproc.h"
#include "xf86_OSlib.h"

#include <sys/event.h>
#include <machine/apmvar.h>

#define _PATH_APM_SOCKET	"/var/run/apmdev"
#define _PATH_APM_DEV		"/dev/apm"
#define _PATH_APM_CTLDEV	"/dev/apmctl"

static void *APMihPtr = NULL;
static int devFd = -1;
static int ctlFd = -1;
static void bsdCloseAPM(void);

static struct {
    u_int apmBsd;
    pmEvent xf86;
} bsdToXF86Array[] = {
    {APM_STANDBY_REQ, XF86_APM_SYS_STANDBY},
    {APM_SUSPEND_REQ, XF86_APM_SYS_SUSPEND},
    {APM_NORMAL_RESUME, XF86_APM_NORMAL_RESUME},
    {APM_CRIT_RESUME, XF86_APM_CRITICAL_RESUME},
    {APM_BATTERY_LOW, XF86_APM_LOW_BATTERY},
    {APM_POWER_CHANGE, XF86_APM_POWER_STATUS_CHANGE},
    {APM_UPDATE_TIME, XF86_APM_UPDATE_TIME},
    {APM_CRIT_SUSPEND_REQ, XF86_APM_CRITICAL_SUSPEND},
    {APM_USER_STANDBY_REQ, XF86_APM_USER_STANDBY},
    {APM_USER_SUSPEND_REQ, XF86_APM_USER_SUSPEND},
    {APM_SYS_STANDBY_RESUME, XF86_APM_STANDBY_RESUME},
#ifdef APM_CAPABILITY_CHANGE
    {APM_CAPABILITY_CHANGE, XF86_APM_CAPABILITY_CHANGED},
#endif
};

static pmEvent
bsdToXF86(int type)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(bsdToXF86Array); i++) {
        if (type == bsdToXF86Array[i].apmBsd) {
            return bsdToXF86Array[i].xf86;
        }
    }
    return XF86_APM_UNKNOWN;
}

/*
 * APM events can be requested direclty from /dev/apm
 */
static int
bsdPMGetEventFromOS(int kq, pmEvent * events, int num)
{
    struct kevent ev;
    int i, result;
    struct timespec ts = { 0, 0 };

    for (i = 0; i < num; i++) {
        result = kevent(kq, NULL, 0, &ev, 1, &ts);
        if (result == 0 || APM_EVENT_TYPE(ev.data) == APM_NOEVENT) {
            /* no event */
            break;
        }
        else if (result < 0) {
            xf86Msg(X_WARNING, "bsdPMGetEventFromOS: kevent returns"
                    " %s\n", strerror(errno));
            break;
        }
        events[i] = bsdToXF86(APM_EVENT_TYPE(ev.data));
    }
    return i;
}

/*
 * If apmd(8) is running, he will get the events and handle them,
 * so, we've nothing to do here.
 * Otherwise, opening /dev/apmctl will succeed and we have to send the
 * confirmations to /dev/apmctl.
 */
static pmWait
bsdPMConfirmEventToOs(int dummyfd, pmEvent event)
{
    if (ctlFd < 0) {
        if ((ctlFd = open(_PATH_APM_CTLDEV, O_RDWR)) < 0) {
            return PM_NONE;
        }
    }
    /* apmctl open succeedeed */
    switch (event) {
    case XF86_APM_SYS_STANDBY:
    case XF86_APM_USER_STANDBY:
        if (ioctl(ctlFd, APM_IOC_STANDBY, NULL) == 0)
            return PM_WAIT;     /* should we stop the Xserver in standby, too? */
        else
            return PM_NONE;

    case XF86_APM_SYS_SUSPEND:
    case XF86_APM_CRITICAL_SUSPEND:
    case XF86_APM_USER_SUSPEND:
        if (ioctl(ctlFd, APM_IOC_SUSPEND, NULL) == 0)
            return PM_WAIT;
        else
            return PM_NONE;
        break;
    case XF86_APM_STANDBY_RESUME:
    case XF86_APM_NORMAL_RESUME:
    case XF86_APM_CRITICAL_RESUME:
    case XF86_APM_STANDBY_FAILED:
    case XF86_APM_SUSPEND_FAILED:
        return PM_CONTINUE;
        break;
    default:
        return PM_NONE;
    }
}

PMClose
xf86OSPMOpen(void)
{
    int kq;
    struct kevent ev;

    if (APMihPtr || !xf86Info.pmFlag) {
        return NULL;
    }
    if ((devFd = open(_PATH_APM_DEV, O_RDONLY)) == -1) {
        return NULL;
    }
    if ((kq = kqueue()) <= 0) {
        close(devFd);
        return NULL;
    }
    EV_SET(&ev, devFd, EVFILT_READ, EV_ADD | EV_ENABLE | EV_CLEAR, 0, 0, NULL);
    if (kevent(kq, &ev, 1, NULL, 0, NULL) < 0) {
        close(devFd);
        return NULL;
    }

    xf86PMGetEventFromOs = bsdPMGetEventFromOS;
    xf86PMConfirmEventToOs = bsdPMConfirmEventToOs;
    APMihPtr = xf86AddGeneralHandler(kq, xf86HandlePMEvents, NULL);
    return bsdCloseAPM;
}

static void
bsdCloseAPM(void)
{
    int kq;

    if (APMihPtr) {
        kq = xf86RemoveGeneralHandler(APMihPtr);
        close(devFd);
        devFd = -1;
        close(kq);
        if (ctlFd >= 0) {
            close(ctlFd);
            ctlFd = -1;
        }
        APMihPtr = NULL;
    }
}