Ticket #728: dummy_driver.c

/*
 * Copyright 2002, SuSE Linux AG, Author: Egbert Eich
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/* All drivers should typically include these */
#include "xf86.h"
#include "xf86_OSproc.h"

/* All drivers initialising the SW cursor need this */
#include "mipointer.h"

/* All drivers using the mi colormap manipulation need this */
#include "micmap.h"

#ifdef RANDR
#include "randrstr.h"
#endif

#include "windowstr.h"

/* identifying atom needed by magnifiers */
#include <X11/Xatom.h>
#include "property.h"

#include "xf86cmap.h"

#include "xf86fbman.h"

#include "fb.h"

#include "picturestr.h"

#ifdef XvExtension
#include "xf86xv.h"
#include <X11/extensions/Xv.h>
#endif


/*
 * Driver data structures.
 */
#include "dummy.h"

/* These need to be checked */
#include <X11/X.h>
#include <X11/Xproto.h>
#include "scrnintstr.h"
#include "servermd.h"
#ifdef USE_DGA
#define _XF86DGA_SERVER_
#include <X11/extensions/xf86dgaproto.h>
#endif

#include <xf86Crtc.h>
#include "inputstr.h"

/* Mandatory functions */
static const OptionInfoRec *    DUMMYAvailableOptions(int chipid, int busid);
static void     DUMMYIdentify(int flags);
static Bool     DUMMYProbe(DriverPtr drv, int flags);
static Bool     DUMMYPreInit(ScrnInfoPtr pScrn, int flags);
static Bool     DUMMYScreenInit(SCREEN_INIT_ARGS_DECL);
static Bool     DUMMYEnterVT(VT_FUNC_ARGS_DECL);
static void     DUMMYLeaveVT(VT_FUNC_ARGS_DECL);
static Bool     DUMMYCloseScreen(CLOSE_SCREEN_ARGS_DECL);
static Bool     DUMMYCreateWindow(WindowPtr pWin);
static void     DUMMYFreeScreen(FREE_SCREEN_ARGS_DECL);
static ModeStatus DUMMYValidMode(SCRN_ARG_TYPE arg, DisplayModePtr mode,
                                 Bool verbose, int flags);
static Bool     DUMMYSaveScreen(ScreenPtr pScreen, int mode);

/* Internally used functions */
static Bool     dummyModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode);
static void     dummySave(ScrnInfoPtr pScrn);
static void     dummyRestore(ScrnInfoPtr pScrn, Bool restoreText);
static Bool     dummyDriverFunc(ScrnInfoPtr pScrn, xorgDriverFuncOp op,
                                pointer ptr);


/* static void     DUMMYDisplayPowerManagementSet(ScrnInfoPtr pScrn, */
/*                              int PowerManagementMode, int flags); */

#define DUMMY_VERSION 4000
#define DUMMY_NAME "DUMMY"
#define DUMMY_DRIVER_NAME "dummy"

#define DUMMY_MAJOR_VERSION PACKAGE_VERSION_MAJOR
#define DUMMY_MINOR_VERSION PACKAGE_VERSION_MINOR
#define DUMMY_PATCHLEVEL PACKAGE_VERSION_PATCHLEVEL

#define DUMMY_MAX_WIDTH 32767
#define DUMMY_MAX_HEIGHT 32767

/*
 * This is intentionally screen-independent.  It indicates the binding
 * choice made in the first PreInit.
 */
static int pix24bpp = 0;


/*
 * This contains the functions needed by the server after loading the driver
 * module.  It must be supplied, and gets passed back by the SetupProc
 * function in the dynamic case.  In the static case, a reference to this
 * is compiled in, and this requires that the name of this DriverRec be
 * an upper-case version of the driver name.
 */

_X_EXPORT DriverRec DUMMY = {
    DUMMY_VERSION,
    DUMMY_DRIVER_NAME,
    DUMMYIdentify,
    DUMMYProbe,
    DUMMYAvailableOptions,
    NULL,
    0,
    dummyDriverFunc
};

static SymTabRec DUMMYChipsets[] = {
    { DUMMY_CHIP,   "dummy" },
    { -1,                NULL }
};

typedef enum {
    OPTION_SW_CURSOR,
    OPTION_CONSTANT_DPI
} DUMMYOpts;

static const OptionInfoRec DUMMYOptions[] = {
    { OPTION_SW_CURSOR, "SWcursor",     OPTV_BOOLEAN,   {0}, FALSE },
#ifdef RANDR
    { OPTION_CONSTANT_DPI,      "ConstantDPI",  OPTV_BOOLEAN,   {0}, FALSE },
#endif
    { -1,                  NULL,           OPTV_NONE,   {0}, FALSE }
};

#ifdef XFree86LOADER

static MODULESETUPPROTO(dummySetup);

static XF86ModuleVersionInfo dummyVersRec =
{
        "dummy",
        MODULEVENDORSTRING,
        MODINFOSTRING1,
        MODINFOSTRING2,
        XORG_VERSION_CURRENT,
        DUMMY_MAJOR_VERSION, DUMMY_MINOR_VERSION, DUMMY_PATCHLEVEL,
        ABI_CLASS_VIDEODRV,
        ABI_VIDEODRV_VERSION,
        MOD_CLASS_VIDEODRV,
        {0,0,0,0}
};

/*
 * This is the module init data.
 * Its name has to be the driver name followed by ModuleData
 */
_X_EXPORT XF86ModuleData dummyModuleData = { &dummyVersRec, dummySetup, NULL };

static pointer
dummySetup(pointer module, pointer opts, int *errmaj, int *errmin)
{
    static Bool setupDone = FALSE;

    if (!setupDone) {
        setupDone = TRUE;
        xf86AddDriver(&DUMMY, module, HaveDriverFuncs);

        /*
         * Modules that this driver always requires can be loaded here
         * by calling LoadSubModule().
         */

        /*
         * The return value must be non-NULL on success even though there
         * is no TearDownProc.
         */
        return (pointer)1;
    } else {
        if (errmaj) *errmaj = LDR_ONCEONLY;
        return NULL;
    }
}

#endif /* XFree86LOADER */

static Bool
DUMMYGetRec(ScrnInfoPtr pScrn)
{
    /*
     * Allocate a DUMMYRec, and hook it into pScrn->driverPrivate.
     * pScrn->driverPrivate is initialised to NULL, so we can check if
     * the allocation has already been done.
     */
    if (pScrn->driverPrivate != NULL)
        return TRUE;

    pScrn->driverPrivate = xnfcalloc(sizeof(DUMMYRec), 1);

    if (pScrn->driverPrivate == NULL)
        return FALSE;
        return TRUE;
}

static void
DUMMYFreeRec(ScrnInfoPtr pScrn)
{
    if (pScrn->driverPrivate == NULL)
        return;
    free(pScrn->driverPrivate);
    pScrn->driverPrivate = NULL;
}

static const OptionInfoRec *
DUMMYAvailableOptions(int chipid, int busid)
{
    return DUMMYOptions;
}

/* Mandatory */
static void
DUMMYIdentify(int flags)
{
    xf86PrintChipsets(DUMMY_NAME, "Driver for Dummy chipsets",
                        DUMMYChipsets);
}

/* Mandatory */
static Bool
DUMMYProbe(DriverPtr drv, int flags)
{
    Bool foundScreen = FALSE;
    int numDevSections, numUsed;
    GDevPtr *devSections;
    int i;

    if (flags & PROBE_DETECT)
        return FALSE;
    /*
     * Find the config file Device sections that match this
     * driver, and return if there are none.
     */
    if ((numDevSections = xf86MatchDevice(DUMMY_DRIVER_NAME,
                                          &devSections)) <= 0) {
        return FALSE;
    }

    numUsed = numDevSections;

    if (numUsed > 0) {

        for (i = 0; i < numUsed; i++) {
            ScrnInfoPtr pScrn = NULL;
            int entityIndex = 
                xf86ClaimNoSlot(drv,DUMMY_CHIP,devSections[i],TRUE);
            /* Allocate a ScrnInfoRec and claim the slot */
            if ((pScrn = xf86AllocateScreen(drv,0 ))) {
                   xf86AddEntityToScreen(pScrn,entityIndex);
                    pScrn->driverVersion = DUMMY_VERSION;
                    pScrn->driverName    = DUMMY_DRIVER_NAME;
                    pScrn->name          = DUMMY_NAME;
                    pScrn->Probe         = DUMMYProbe;
                    pScrn->PreInit       = DUMMYPreInit;
                    pScrn->ScreenInit    = DUMMYScreenInit;
                    pScrn->SwitchMode    = DUMMYSwitchMode;
                    pScrn->AdjustFrame   = DUMMYAdjustFrame;
                    pScrn->EnterVT       = DUMMYEnterVT;
                    pScrn->LeaveVT       = DUMMYLeaveVT;
                    pScrn->FreeScreen    = DUMMYFreeScreen;
                    pScrn->ValidMode     = DUMMYValidMode;

                    foundScreen = TRUE;
            }
        }
    }    
    return foundScreen;
}

# define RETURN \
    { DUMMYFreeRec(pScrn);\
                            return FALSE;\
                                             }

/* Mandatory */
Bool
DUMMYPreInit(ScrnInfoPtr pScrn, int flags)
{
    ClockRangePtr clockRanges;
    int i;
    DUMMYPtr dPtr;
    int maxClock = 230000;
    GDevPtr device = xf86GetEntityInfo(pScrn->entityList[0])->device;

    if (flags & PROBE_DETECT) 
        return TRUE;
    
    /* Allocate the DummyRec driverPrivate */
    if (!DUMMYGetRec(pScrn)) {
        return FALSE;
    }
    
    dPtr = DUMMYPTR(pScrn);

    pScrn->chipset = (char *)xf86TokenToString(DUMMYChipsets,
                                               DUMMY_CHIP);

    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Chipset is a DUMMY\n");
    
    pScrn->monitor = pScrn->confScreen->monitor;

    if (!xf86SetDepthBpp(pScrn, 0, 0, 0,  Support24bppFb | Support32bppFb))
        return FALSE;
    else {
        /* Check that the returned depth is one we support */
        switch (pScrn->depth) {
        case 8:
        case 15:
        case 16:
        case 24:
            break;
        default:
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                       "Given depth (%d) is not supported by this driver\n",
                       pScrn->depth);
            return FALSE;
        }
    }

    xf86PrintDepthBpp(pScrn);
    if (pScrn->depth == 8)
        pScrn->rgbBits = 8;

    /* Get the depth24 pixmap format */
    if (pScrn->depth == 24 && pix24bpp == 0)
        pix24bpp = xf86GetBppFromDepth(pScrn, 24);

    /*
     * This must happen after pScrn->display has been set because
     * xf86SetWeight references it.
     */
    if (pScrn->depth > 8) {
        /* The defaults are OK for us */
        rgb zeros = {0, 0, 0};

        if (!xf86SetWeight(pScrn, zeros, zeros)) {
            return FALSE;
        } else {
            /* XXX check that weight returned is supported */
            ;
        }
    }

    if (!xf86SetDefaultVisual(pScrn, -1)) 
        return FALSE;

    if (pScrn->depth > 1) {
        Gamma zeros = {0.0, 0.0, 0.0};

        if (!xf86SetGamma(pScrn, zeros))
            return FALSE;
    }

    xf86CollectOptions(pScrn, device->options);
    /* Process the options */
    if (!(dPtr->Options = malloc(sizeof(DUMMYOptions))))
        return FALSE;
    memcpy(dPtr->Options, DUMMYOptions, sizeof(DUMMYOptions));

    xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, dPtr->Options);

    xf86GetOptValBool(dPtr->Options, OPTION_SW_CURSOR,&dPtr->swCursor);
    xf86GetOptValBool(dPtr->Options, OPTION_CONSTANT_DPI, &dPtr->constantDPI);

    if (device->videoRam != 0) {
        pScrn->videoRam = device->videoRam;
        xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "VideoRAM: %d kByte\n",
                   pScrn->videoRam);
    } else {
        pScrn->videoRam = 4096;
        xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "VideoRAM: %d kByte\n",
                   pScrn->videoRam);
    }
    
    if (device->dacSpeeds[0] != 0) {
        maxClock = device->dacSpeeds[0];
        xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Max Clock: %d kHz\n",
                   maxClock);
    } else {
        xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "Max Clock: %d kHz\n",
                   maxClock);
    }

    pScrn->progClock = TRUE;
    /*
     * Setup the ClockRanges, which describe what clock ranges are available,
     * and what sort of modes they can be used for.
     */
    clockRanges = (ClockRangePtr)xnfcalloc(sizeof(ClockRange), 1);
    clockRanges->next = NULL;
    clockRanges->ClockMulFactor = 1;
    clockRanges->minClock = 11000;   /* guessed §§§ */
    clockRanges->maxClock = 300000;
    clockRanges->clockIndex = -1;               /* programmable */
    clockRanges->interlaceAllowed = TRUE; 
    clockRanges->doubleScanAllowed = TRUE;

    /* Subtract memory for HW cursor */


    {
        int apertureSize = (pScrn->videoRam * 1024);
        i = xf86ValidateModes(pScrn, pScrn->monitor->Modes,
                              pScrn->display->modes, clockRanges,
                              NULL, 256, DUMMY_MAX_WIDTH,
                              (8 * pScrn->bitsPerPixel),
                              128, DUMMY_MAX_HEIGHT, pScrn->display->virtualX,
                              pScrn->display->virtualY, apertureSize,
                              LOOKUP_BEST_REFRESH);

       if (i == -1)
           RETURN;
    }

    /* Prune the modes marked as invalid */
    xf86PruneDriverModes(pScrn);

    if (i == 0 || pScrn->modes == NULL) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "No valid modes found\n");
        RETURN;
    }

    /*
     * Set the CRTC parameters for all of the modes based on the type
     * of mode, and the chipset's interlace requirements.
     *
     * Calling this is required if the mode->Crtc* values are used by the
     * driver and if the driver doesn't provide code to set them.  They
     * are not pre-initialised at all.
     */
    xf86SetCrtcForModes(pScrn, 0); 
 
    /* Set the current mode to the first in the list */
    pScrn->currentMode = pScrn->modes;

    /* Print the list of modes being used */
    xf86PrintModes(pScrn);

    /* If monitor resolution is set on the command line, use it */
    xf86SetDpi(pScrn, 0, 0);

    if (xf86LoadSubModule(pScrn, "fb") == NULL) {
        RETURN;
    }

    if (!dPtr->swCursor) {
        if (!xf86LoadSubModule(pScrn, "ramdac"))
            RETURN;
    }
    
    /* We have no contiguous physical fb in physical memory */
    pScrn->memPhysBase = 0;
    pScrn->fbOffset = 0;

    return TRUE;
}
#undef RETURN

/* Mandatory */
static Bool
DUMMYEnterVT(VT_FUNC_ARGS_DECL)
{
    SCRN_INFO_PTR(arg);
    
    /* Should we re-save the text mode on each VT enter? */
    if(!dummyModeInit(pScrn, pScrn->currentMode))
      return FALSE;

    DUMMYAdjustFrame(ADJUST_FRAME_ARGS(pScrn, pScrn->frameX0, pScrn->frameY0));

    return TRUE;
}

/* Mandatory */
static void
DUMMYLeaveVT(VT_FUNC_ARGS_DECL)
{
    SCRN_INFO_PTR(arg);
    dummyRestore(pScrn, TRUE);
}

static void
DUMMYLoadPalette(
   ScrnInfoPtr pScrn,
   int numColors,
   int *indices,
   LOCO *colors,
   VisualPtr pVisual
){
   int i, index, shift, Gshift;
   DUMMYPtr dPtr = DUMMYPTR(pScrn);

   switch(pScrn->depth) {
   case 15:     
        shift = Gshift = 1;
        break;
   case 16:
        shift = 0; 
        Gshift = 0;
        break;
   default:
        shift = Gshift = 0;
        break;
   }

   for(i = 0; i < numColors; i++) {
       index = indices[i];
       dPtr->colors[index].red = colors[index].red << shift;
       dPtr->colors[index].green = colors[index].green << Gshift;
       dPtr->colors[index].blue = colors[index].blue << shift;
   } 

}

static ScrnInfoPtr DUMMYScrn; /* static-globalize it */

/* Mandatory */
static Bool
DUMMYScreenInit(SCREEN_INIT_ARGS_DECL)
{
    ScrnInfoPtr pScrn;
    DUMMYPtr dPtr;
    int ret;
    VisualPtr visual;
    
    /*
     * we need to get the ScrnInfoRec for this screen, so let's allocate
     * one first thing
     */
    pScrn = xf86ScreenToScrn(pScreen);
    dPtr = DUMMYPTR(pScrn);
    DUMMYScrn = pScrn;


    if (!(dPtr->FBBase = malloc(pScrn->videoRam * 1024)))
        return FALSE;
    
    /*
     * next we save the current state and setup the first mode
     */
    dummySave(pScrn);
    
    if (!dummyModeInit(pScrn,pScrn->currentMode))
        return FALSE;
    DUMMYAdjustFrame(ADJUST_FRAME_ARGS(pScrn, pScrn->frameX0, pScrn->frameY0));

    /*
     * Reset visual list.
     */
    miClearVisualTypes();
    
    /* Setup the visuals we support. */
    
    if (!miSetVisualTypes(pScrn->depth,
                      miGetDefaultVisualMask(pScrn->depth),
                      pScrn->rgbBits, pScrn->defaultVisual))
         return FALSE;

    if (!miSetPixmapDepths ()) return FALSE;

    /*
     * Call the framebuffer layer's ScreenInit function, and fill in other
     * pScreen fields.
     */
    ret = fbScreenInit(pScreen, dPtr->FBBase,
                            pScrn->virtualX, pScrn->virtualY,
                            pScrn->xDpi, pScrn->yDpi,
                            pScrn->displayWidth, pScrn->bitsPerPixel);
    if (!ret)
        return FALSE;

    if (pScrn->depth > 8) {
        /* Fixup RGB ordering */
        visual = pScreen->visuals + pScreen->numVisuals;
        while (--visual >= pScreen->visuals) {
            if ((visual->class | DynamicClass) == DirectColor) {
                visual->offsetRed = pScrn->offset.red;
                visual->offsetGreen = pScrn->offset.green;
                visual->offsetBlue = pScrn->offset.blue;
                visual->redMask = pScrn->mask.red;
                visual->greenMask = pScrn->mask.green;
                visual->blueMask = pScrn->mask.blue;
            }
        }
    }
    
    /* must be after RGB ordering fixed */
    fbPictureInit(pScreen, 0, 0);

    xf86SetBlackWhitePixels(pScreen);

#ifdef USE_DGA
    DUMMYDGAInit(pScreen);
#endif
    
    if (dPtr->swCursor)
        xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Using Software Cursor.\n");

    {

         
        BoxRec AvailFBArea;
        int lines = pScrn->videoRam * 1024 /
            (pScrn->displayWidth * (pScrn->bitsPerPixel >> 3));
        AvailFBArea.x1 = 0;
        AvailFBArea.y1 = 0;
        AvailFBArea.x2 = pScrn->displayWidth;
        AvailFBArea.y2 = lines;
        xf86InitFBManager(pScreen, &AvailFBArea); 
        
        xf86DrvMsg(pScrn->scrnIndex, X_INFO, 
                   "Using %i scanlines of offscreen memory \n"
                   , lines - pScrn->virtualY);
    }

    xf86SetBackingStore(pScreen);
    xf86SetSilkenMouse(pScreen);

    //pScreen->isGPU = 0;
        
    /* Initialise cursor functions */
    miDCInitialize (pScreen, xf86GetPointerScreenFuncs());


    if (!dPtr->swCursor) {
      /* HW cursor functions */
      if (!DUMMYCursorInit(pScreen)) {
          xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                     "Hardware cursor initialization failed\n");
          return FALSE;
      }
    }
    
    /* Initialise default colourmap */
    if(!miCreateDefColormap(pScreen))
        return FALSE;

    if (!xf86HandleColormaps(pScreen, 256, pScrn->rgbBits,
                         DUMMYLoadPalette, NULL, 
                         CMAP_PALETTED_TRUECOLOR 
                             | CMAP_RELOAD_ON_MODE_SWITCH))
        return FALSE;

/*     DUMMYInitVideo(pScreen); */

    pScreen->SaveScreen = DUMMYSaveScreen;

    
    /* Wrap the current CloseScreen function */
    dPtr->CloseScreen = pScreen->CloseScreen;
    pScreen->CloseScreen = DUMMYCloseScreen;

    /* Wrap the current CreateWindow function */
    dPtr->CreateWindow = pScreen->CreateWindow;
    pScreen->CreateWindow = DUMMYCreateWindow;

    pScreen->ConstrainCursorHarder = NULL;

    /* Report any unused options (only for the first generation) */
    if (serverGeneration == 1) {
        xf86ShowUnusedOptions(pScrn->scrnIndex, pScrn->options);
    }

    return TRUE;
}

const char *XDPY_PROPERTY = "dummy-constant-xdpi";
const char *YDPY_PROPERTY = "dummy-constant-ydpi";
static int get_dpi_value(WindowPtr root, const char *property_name, int default_dpi)
{
    PropertyPtr prop;
    Atom type_atom = MakeAtom("CARDINAL", 8, TRUE);
    Atom prop_atom = MakeAtom(property_name, strlen(property_name), FALSE);

    for (prop = wUserProps(root); prop; prop = prop->next) {
       if (prop->propertyName == prop_atom && prop->type == type_atom && prop->data) {
           int v = (int) (*((CARD32 *) prop->data));
           if ((v>0) && (v<4096)) {
               xf86DrvMsg(0, X_INFO, "get_constant_dpi_value() found property \"%s\" with value=%i\n", property_name, (int) v);
               return (int) v;
           }
           break;
       }
    }
    return default_dpi;
}

/* Mandatory */
Bool
DUMMYSwitchMode(SWITCH_MODE_ARGS_DECL)
{
    SCRN_INFO_PTR(arg);
    if (!dummyModeInit(pScrn, mode))
        return FALSE;
    pScrn->pScreen->ConstrainCursorHarder = NULL;
#ifdef RANDR
    DUMMYPtr dPtr = DUMMYPTR(pScrn);
    if (dPtr->constantDPI) {
        int xDpi = get_dpi_value(pScrn->pScreen->root, XDPY_PROPERTY, pScrn->xDpi);
        int yDpi = get_dpi_value(pScrn->pScreen->root, YDPY_PROPERTY, pScrn->yDpi);
        //25.4 mm per inch: (254/10)
        pScrn->pScreen->mmWidth = mode->HDisplay * 254 / xDpi / 10;
        pScrn->pScreen->mmHeight = mode->VDisplay * 254 / yDpi / 10;
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "mm(dpi %ix%i)=%ix%i\n", xDpi, yDpi, pScrn->pScreen->mmWidth, pScrn->pScreen->mmHeight);
        RRScreenSizeNotify(pScrn->pScreen);
        RRTellChanged(pScrn->pScreen);
    }
#endif
    xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Screen: %ix%i\n", pScrn->pScreen->width, pScrn->pScreen->height);
    //xf86SetCrtcForModes(pScrn, 0); 
    //xf86SetModeCrtc(pScrn->modes, 0);
    //xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Modes: %s : %ix%i\n", pScrn->modes->name, pScrn->modes->HTotal, pScrn->modes->VTotal);
    int c,d;
 
    rrScrPrivPtr rrScrPriv = rrGetScrPriv(pScrn->pScreen);
    xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "rrScrPriv: %p\n", rrScrPriv);
    for (c = 0; c < rrScrPriv->numCrtcs; c++) {
        RRCrtcPtr crtc = rrScrPriv->crtcs[c];
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "crtc[%i]: %p %i outputs\n", c, &crtc, crtc->numOutputs);
        //xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "crtc[%i]: %p\n", c, &crtc);
        for (d = 0; d < crtc->numOutputs; d++) {
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " output[%i] = %s", d, crtc->outputs[d]->name);
        }
        xf86CrtcPtr xfcrtc = crtc->devPrivate;
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "CRTC: %i: %p\n", c, xfcrtc);
    }

    xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "InputInfo: %p\n", &inputInfo);
    xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "InputInfo.devices: %p\n", inputInfo.devices);
    DeviceIntPtr pDev;
    SpritePtr pSprite;
    c = 0;
    for (pDev = inputInfo.devices; pDev; pDev = pDev->next)
    {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "device=%p\n", pDev);
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " enabled=%i\n", pDev->enabled);
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " coreEvents=%i\n", pDev->coreEvents);
        if (pDev->config_info!=NULL)
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " config_info=%p\n", pDev->config_info);
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " spriteInfo=%p\n", pDev->spriteInfo);
        if (pDev->spriteInfo)
        {
            pSprite = pDev->spriteInfo->sprite;
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " pSprite[%d]=%p\n", c, pSprite);
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " hotLimits=%i,%i,%i,%i\n", pSprite->hotLimits.x1, pSprite->hotLimits.y1, pSprite->hotLimits.x2, pSprite->hotLimits.y2);
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " physLimits=%i,%i,%i,%i\n", pSprite->physLimits.x1, pSprite->physLimits.y1, pSprite->physLimits.x2, pSprite->physLimits.y2);
        }
        c++;
    }


    //RRCrtcPtr rrcrtc = xf86GetPrimaryCrtc(pScrn->pScreen)->randr_crtc;
    //xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "crtc: %p\n", rrcrtc);
    //rrcrtc = xf86CompatRRCrtc(pScrn);
    //xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "crtc: %p\n", rrcrtc);

    //xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
    //xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "config: %p\n", config);
    //lazy: just update all the crtcs!
    /*for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "CRTC: %i: %p\n", c, crtc);
        if (crtc!=NULL) {
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "CRTC: %i: active=%i\n", c, crtc->active);
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR, " bounds: %i,%i,%i,%i", crtc->bounds.x1, crtc->bounds.y1, crtc->bounds.x2, crtc->bounds.y2);
        }
        //crtc->bounds = NULL;
    }*/
    //BarrierScreenPtr cs = GetBarrierScreen(screen);
    //XIBarrierInit()
    //XIBarrierReset();
    //XFixesDestroyPointerBarrier();
    //BarrierScreenPtr cs = GetBarrierScreen(pScreen);
    //XFixesDestroyPointerBarrier(Display *dpy, PointerBarrier b);
    //xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Screen: %ix%i\n", pScrn->displayWidth, pScrn->displayHeight);

    return TRUE;
}

/* Mandatory */
void
DUMMYAdjustFrame(ADJUST_FRAME_ARGS_DECL)
{
    SCRN_INFO_PTR(arg);
    int Base; 

    Base = (y * pScrn->displayWidth + x) >> 2;

    /* Scale Base by the number of bytes per pixel. */
    switch (pScrn->depth) {
    case  8 :
        break;
    case 15 :
    case 16 :
        Base *= 2;
        break;
    case 24 :
        Base *= 3;
        break;
    default :
        break;
    }
}

/* Mandatory */
static Bool
DUMMYCloseScreen(CLOSE_SCREEN_ARGS_DECL)
{
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
    DUMMYPtr dPtr = DUMMYPTR(pScrn);

    if(pScrn->vtSema){
        dummyRestore(pScrn, TRUE);
        free(dPtr->FBBase);
    }

    if (dPtr->CursorInfo)
        xf86DestroyCursorInfoRec(dPtr->CursorInfo);

    pScrn->vtSema = FALSE;
    pScreen->CloseScreen = dPtr->CloseScreen;
    return (*pScreen->CloseScreen)(CLOSE_SCREEN_ARGS);
}

/* Optional */
static void
DUMMYFreeScreen(FREE_SCREEN_ARGS_DECL)
{
    SCRN_INFO_PTR(arg);
    DUMMYFreeRec(pScrn);
}

static Bool
DUMMYSaveScreen(ScreenPtr pScreen, int mode)
{
    ScrnInfoPtr pScrn = NULL;
    DUMMYPtr dPtr;

    if (pScreen != NULL) {
        pScrn = xf86ScreenToScrn(pScreen);
        dPtr = DUMMYPTR(pScrn);

        dPtr->screenSaver = xf86IsUnblank(mode);
    } 
    return TRUE;
}

/* Optional */
static ModeStatus
DUMMYValidMode(SCRN_ARG_TYPE arg, DisplayModePtr mode, Bool verbose, int flags)
{
    return(MODE_OK);
}

static void
dummySave(ScrnInfoPtr pScrn)
{
}

static void 
dummyRestore(ScrnInfoPtr pScrn, Bool restoreText)
{
}
    
static Bool
dummyModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode)
{
    dummyRestore(pScrn, FALSE);
    
    return(TRUE);
}

Atom VFB_PROP  = 0;
#define  VFB_PROP_NAME  "VFB_IDENT"

static Bool
DUMMYCreateWindow(WindowPtr pWin)
{
    ScreenPtr pScreen = pWin->drawable.pScreen;
    DUMMYPtr dPtr = DUMMYPTR(DUMMYScrn);
    WindowPtr pWinRoot;
    int ret;

    pScreen->CreateWindow = dPtr->CreateWindow;
    ret = pScreen->CreateWindow(pWin);
    dPtr->CreateWindow = pScreen->CreateWindow;
    pScreen->CreateWindow = DUMMYCreateWindow;

    if(ret != TRUE)
        return(ret);
        
    if(dPtr->prop == FALSE) {
#if GET_ABI_MAJOR(ABI_VIDEODRV_VERSION) < 8
        pWinRoot = WindowTable[DUMMYScrn->pScreen->myNum];
#else
        pWinRoot = DUMMYScrn->pScreen->root;
#endif
        if (! ValidAtom(VFB_PROP))
            VFB_PROP = MakeAtom(VFB_PROP_NAME, strlen(VFB_PROP_NAME), 1);

        ret = ChangeWindowProperty(pWinRoot, VFB_PROP, XA_STRING, 
                8, PropModeReplace, (int)4, (pointer)"TRUE", FALSE);
        if( ret != Success)
                ErrorF("Could not set VFB root window property");
        dPtr->prop = TRUE;

        return TRUE;
    }
    return TRUE;
}

#ifndef HW_SKIP_CONSOLE
#define HW_SKIP_CONSOLE 4
#endif

static Bool
dummyDriverFunc(ScrnInfoPtr pScrn, xorgDriverFuncOp op, pointer ptr)
{
    CARD32 *flag;
    
    switch (op) {
        case GET_REQUIRED_HW_INTERFACES:
            flag = (CARD32*)ptr;
            (*flag) = HW_SKIP_CONSOLE;
            return TRUE;
        default:
            return FALSE;
    }
}