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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDIO.cpp, revision 1.1

1.1     ! root        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: 

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