xi: add DEVICE_ENABLE control

Add DEVICE_ENABLE control, which allows runtime enabling and disabling
of specific devices.

Xi/chgdctl.c

@@ -106,6 +106,7 @@ ProcXChangeDeviceControl(ClientPtr client)
     CARD32 *resolution;
     xDeviceTSCtl *ts;
     xDeviceCoreCtl *c;
+    xDeviceEnableCtl *e;
 
     REQUEST(xChangeDeviceControlReq);
     REQUEST_AT_LEAST_SIZE(xChangeDeviceControlReq);
@@ -217,6 +218,28 @@ ProcXChangeDeviceControl(ClientPtr client)
             return Success;
         }
 
+        break;
+    case DEVICE_ENABLE:
+        e = (xDeviceEnableCtl *)&stuff[1];
+
+        status = ChangeDeviceControl(client, dev, (xDeviceCtl *) e);
+
+        if (status == Success) {
+            if (e->enable)
+                EnableDevice(dev);
+            else
+                DisableDevice(dev);
+        } else if (status == DeviceBusy) {
+            rep.status = DeviceBusy;
+            WriteReplyToClient(client, sizeof(xChangeDeviceControlReply),
+                               &rep);
+            return Success;
+        } else {
+            SendErrorToClient(client, IReqCode, X_ChangeDeviceControl, 0,
+                              BadMatch);
+            return Success;
+        }
+
         break;
     default:
 	SendErrorToClient(client, IReqCode, X_ChangeDeviceControl, 0, BadValue);

Xi/getdctl.c

@@ -136,6 +136,9 @@ ProcXGetDeviceControl(ClientPtr client)
     case DEVICE_CORE:
         total_length = sizeof(xDeviceCoreCtl);
         break;
+    case DEVICE_ENABLE:
+        total_length = sizeof(xDeviceEnableCtl);
+        break;
     default:
 	SendErrorToClient(client, IReqCode, X_GetDeviceControl, 0, BadValue);
 	return Success;
@@ -157,6 +160,10 @@ ProcXGetDeviceControl(ClientPtr client)
         break;
     case DEVICE_CORE:
         CopySwapDeviceCore(client, dev, buf);
+        break;
+    case DEVICE_ENABLE:
+        CopySwapDeviceEnable(client, dev, buf);
+        break;
     default:
 	break;
     }
@@ -239,6 +246,7 @@ void CopySwapDeviceCore (ClientPtr client, DeviceIntPtr dev, char *buf)
     c->control = DEVICE_CORE;
     c->length = sizeof(c);
     c->status = dev->coreEvents;
+    c->iscore = (dev == inputInfo.keyboard || dev == inputInfo.pointer);
 
     if (client->swapped) {
         swaps(&c->control, n);
@@ -247,6 +255,22 @@ void CopySwapDeviceCore (ClientPtr client, DeviceIntPtr dev, char *buf)
     }
 }
 
+void CopySwapDeviceEnable (ClientPtr client, DeviceIntPtr dev, char *buf)
+{
+    register char n;
+    xDeviceEnableState *e = (xDeviceEnableState *) buf;
+
+    e->control = DEVICE_ENABLE;
+    e->length = sizeof(e);
+    e->enable = dev->enabled;
+
+    if (client->swapped) {
+        swaps(&e->control, n);
+        swaps(&e->length, n);
+        swaps(&e->enable, n);
+    }
+}
+
 
 /***********************************************************************
  *

Xi/getdctl.h

@@ -52,6 +52,11 @@ void CopySwapDeviceCore(ClientPtr /* client */ ,
                         char * /* buf */
     );
 
+void CopySwapDeviceEnable(ClientPtr /* client */ ,
+                          DeviceIntPtr /* dev */ ,
+                          char * /* buf */
+    );
+
 void SRepXGetDeviceControl(ClientPtr /* client */ ,
 			   int /* size */ ,
 			   xGetDeviceControlReply *	/* rep */

dix/devices.c

@@ -130,6 +130,8 @@ AddInputDevice(DeviceProc deviceProc, Bool autoStart)
     dev->devPrivates = NULL;
     dev->unwrapProc = NULL;
     dev->coreEvents = TRUE;
+    dev->inited = FALSE;
+    dev->enabled = FALSE;
 
     for (prev = &inputInfo.off_devices; *prev; prev = &(*prev)->next)
         ;
@@ -154,6 +156,7 @@ EnableDevice(register DeviceIntPtr dev)
         ErrorF("couldn't enable device %d\n", dev->id);
 	return FALSE;
     }
+    dev->enabled = TRUE;
     *prev = dev->next;
 
     for (prev = &inputInfo.devices; *prev; prev = &(*prev)->next)
@@ -176,6 +179,7 @@ DisableDevice(register DeviceIntPtr dev)
     if (*prev != dev)
 	return FALSE;
     (void)(*dev->deviceProc)(dev, DEVICE_OFF);
+    dev->enabled = FALSE;
     *prev = dev->next;
     dev->next = inputInfo.off_devices;
     inputInfo.off_devices = dev;

include/inputstr.h

@@ -265,6 +265,7 @@ typedef struct _DeviceIntRec {
 					  used to initialize, turn on, or
 					  turn off the device */
     Bool	inited;			/* TRUE if INIT returns Success */
+    Bool        enabled;                /* TRUE if ON returns Success */
     Bool        coreEvents;             /* TRUE if device also sends core */
     GrabPtr	grab;			/* the grabber - used by DIX */
     struct {