e:/XFree86 for RH 8.0/XFree86-4.2.0/xc/programs/Xserver/hw/xfree86/common/xf86PM.c

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/* $XFree86: xc/programs/Xserver/hw/xfree86/common/xf86PM.c,v 3.5 2001/10/01 13:44:01 eich Exp $ */


#include "X.h"
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86Xinput.h"

int (*xf86PMGetEventFromOs)(int fd,pmEvent *events,int num) = NULL;
pmWait (*xf86PMConfirmEventToOs)(int fd,pmEvent event) = NULL;

static Bool suspended = FALSE;

static char *
eventName(pmEvent event)
{
    switch(event) {
    case XF86_APM_SYS_STANDBY: return ("System Standby Request");
    case XF86_APM_SYS_SUSPEND: return ("System Suspend Request");
    case XF86_APM_CRITICAL_SUSPEND: return ("Critical Suspend");
    case XF86_APM_USER_STANDBY: return ("User System Standby Request");
    case XF86_APM_USER_SUSPEND: return ("User System Suspend Request");
    case XF86_APM_STANDBY_RESUME: return ("System Standby Resume");
    case XF86_APM_NORMAL_RESUME: return ("Normal Resume System");
    case XF86_APM_CRITICAL_RESUME: return ("Critical Resume System");
    case XF86_APM_LOW_BATTERY: return ("Battery Low");
    case XF86_APM_POWER_STATUS_CHANGE: return ("Power Status Change");
    case XF86_APM_UPDATE_TIME: return ("Update Time");
    case XF86_APM_CAPABILITY_CHANGED: return ("Capability Changed");
    case XF86_APM_STANDBY_FAILED: return ("Standby Request Failed");
    case XF86_APM_SUSPEND_FAILED: return ("Suspend Request Failed");
    default: return ("Unknown Event");
    }
}

static void
suspend (pmEvent event, Bool undo)
{
    int i;
    InputInfoPtr pInfo;
    
    for (i = 0; i < xf86NumScreens; i++) {
        xf86EnableAccess(xf86Screens[i]);
        if (xf86Screens[i]->EnableDisableFBAccess)
            (*xf86Screens[i]->EnableDisableFBAccess) (i, FALSE);
    }
#if !defined(__EMX__)
    DisableDevice((DeviceIntPtr)xf86Info.pKeyboard);
    pInfo = xf86InputDevs;
    while (pInfo) {
        DisableDevice(pInfo->dev);
        pInfo = pInfo->next;
    }
#endif
    xf86EnterServerState(SETUP);
    for (i = 0; i < xf86NumScreens; i++) {
        xf86EnableAccess(xf86Screens[i]);
        if (xf86Screens[i]->PMEvent)
            xf86Screens[i]->PMEvent(i,event,undo);
        else {
            xf86Screens[i]->LeaveVT(i, 0);
            xf86Screens[i]->vtSema = FALSE;
        }
    }
    xf86AccessLeave();      
    xf86AccessLeaveState(); 
}

static void
resume(pmEvent event, Bool undo)
{
    int i;
    InputInfoPtr pInfo;

    xf86AccessEnter();
    xf86EnterServerState(SETUP);
    for (i = 0; i < xf86NumScreens; i++) {
        xf86EnableAccess(xf86Screens[i]);
        if (xf86Screens[i]->PMEvent)
            xf86Screens[i]->PMEvent(i,event,undo);
        else {
            xf86Screens[i]->vtSema = TRUE;
            xf86Screens[i]->EnterVT(i, 0);
        }
    }
    xf86EnterServerState(OPERATING);
    for (i = 0; i < xf86NumScreens; i++) {
        xf86EnableAccess(xf86Screens[i]);
        if (xf86Screens[i]->EnableDisableFBAccess)
            (*xf86Screens[i]->EnableDisableFBAccess) (i, TRUE);
    }
    SaveScreens(SCREEN_SAVER_FORCER, ScreenSaverReset);
#if !defined(__EMX__)
    pInfo = xf86InputDevs;
    while (pInfo) {
        EnableDevice(pInfo->dev);
        pInfo = pInfo->next;
    }
    EnableDevice((DeviceIntPtr)xf86Info.pKeyboard);
#endif
}

static void
DoApmEvent(pmEvent event, Bool undo)
{
    /* 
     * we leave that as a global function for now. I don't know if 
     * this might cause problems in the future. It is a global server 
     * variable therefore it needs to be in a server info structure
     */
    int i;
    
    switch(event) {
    case XF86_APM_SYS_STANDBY:
    case XF86_APM_SYS_SUSPEND:
    case XF86_APM_CRITICAL_SUSPEND: /*do we want to delay a critical suspend?*/
    case XF86_APM_USER_STANDBY:
    case XF86_APM_USER_SUSPEND:
        /* should we do this ? */
        if (!undo && !suspended) {
            suspend(event,undo);
            suspended = TRUE;
        } else if (undo && suspended) {
            resume(event,undo);
            suspended = FALSE;
        }
        break;
    case XF86_APM_STANDBY_RESUME:
    case XF86_APM_NORMAL_RESUME:
    case XF86_APM_CRITICAL_RESUME:
        if (suspended) {
            resume(event,undo);
            suspended = FALSE;
        }
        break;
    default:
        xf86EnterServerState(SETUP);
        for (i = 0; i < xf86NumScreens; i++) {
            xf86EnableAccess(xf86Screens[i]);
            if (xf86Screens[i]->PMEvent)
                xf86Screens[i]->PMEvent(i,event,undo);
        }
        xf86EnterServerState(OPERATING);
        break;
    }
}

#define MAX_NO_EVENTS 8

void
xf86HandlePMEvents(int fd, pointer data)
{
    pmEvent events[MAX_NO_EVENTS];
    int i,n;
    Bool wait = FALSE;

    if (!xf86PMGetEventFromOs)
        return;

    if ((n = xf86PMGetEventFromOs(fd,events,MAX_NO_EVENTS))) {
        do {
            for (i = 0; i < n; i++) {
                xf86MsgVerb(X_INFO,3,"PM Event received: %s\n",
                            eventName(events[i]));
                DoApmEvent(events[i],FALSE);
                switch (xf86PMConfirmEventToOs(fd,events[i])) {
                case PM_WAIT:
                    wait = TRUE;
                    break;
                case PM_CONTINUE:
                    wait = FALSE;
                    break;
                case PM_FAILED:
                    DoApmEvent(events[i],TRUE);
                    wait = FALSE;
                    break;
                default:
                    break;
                }
            }
            if (wait)
                n = xf86PMGetEventFromOs(fd,events,MAX_NO_EVENTS);
            else
                break;
        } while (1);
    }
}

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