iokit/Families/IOHIDSystem/IOHIDIO.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*      Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
  23  *
  24  * EventIO.m - Event System MiG interface for driver control and status.
  25  *
  26  * HISTORY
  27  * 2-April-92    Mike Paquette at NeXT
  28  *      Created.
  29  */
  30
  31 #include <IOKit/system.h>
  32
  33 #include <IOKit/hidsystem/IOHIDTypes.h>
  34 #include <IOKit/hidsystem/IOHIDSystem.h>
  35 #include <IOKit/hidsystem/IOHIDShared.h>
  36
  37 #include <IOKit/hidsystem/ev_private.h> /* Per-machine configuration info */
  38
  39 /*
  40  * Additional kernel API to drivers using the Event Driver
  41  */
  42  int
  43 EventCoalesceDisplayCmd( int cmd, int oldcmd )
  44 {
  45         static const char coalesce[4][4] = {
  46             /* nop */  {EVNOP,  EVHIDE, EVSHOW, EVMOVE},
  47             /* hide */ {EVHIDE, EVHIDE, EVNOP,  EVSHOW},
  48             /* show */ {EVSHOW, EVNOP,  EVSHOW, EVSHOW},
  49             /* move */ {EVMOVE, EVHIDE, EVSHOW, EVMOVE}
  50         };
  51         if ( cmd < EVLEVEL )    // coalesce EVNOP thru EVMOVE only
  52             cmd = coalesce[oldcmd & 3][cmd & 3];
  53         return cmd;
  54 }
  55