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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDPostProcessRIValue.c, 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: /*
        !            23:        File:           HIDPostProcessRIValue.c
        !            24: 
        !            25:        Contains:       xxx put contents here xxx
        !            26: 
        !            27:        Version:        xxx put version here xxx
        !            28: 
        !            29:        Copyright:      � 1999 by Apple Computer, Inc., all rights reserved.
        !            30: 
        !            31:        File Ownership:
        !            32: 
        !            33:                DRI:                            xxx put dri here xxx
        !            34: 
        !            35:                Other Contact:          xxx put other contact here xxx
        !            36: 
        !            37:                Technology:                     xxx put technology here xxx
        !            38: 
        !            39:        Writers:
        !            40: 
        !            41:                (BWS)   Brent Schorsch
        !            42: 
        !            43:        Change History (most recent first):
        !            44: 
        !            45:          <USB1>          4/7/99        BWS             first checked in
        !            46: */
        !            47: 
        !            48: #include "HIDLib.h"
        !            49: 
        !            50: /*
        !            51:  *------------------------------------------------------------------------------
        !            52:  *
        !            53:  * HIDPostProcessRIValue -     performs any post-processing necessary for data 
        !            54:  *                                                     retrieved _from_ a report for the specified report 
        !            55:  *                                                     item. Currently, the only post-processing done 
        !            56:  *                                                     is reversing when appropriate
        !            57:  *
        !            58:  *      Input:
        !            59:  *                       reportItem                    - The report item
        !            60:  *                       value                                 - the value, from HIDGetData
        !            61:  *      Output:
        !            62:  *                       value                                 - The processed value
        !            63:  *      Returns:
        !            64:  *                       kHIDSuccess                   - Success
        !            65:  *
        !            66:  *------------------------------------------------------------------------------
        !            67: */
        !            68: 
        !            69: OSStatus HIDPostProcessRIValue (HIDReportItem *                reportItem,
        !            70:                                                                SInt32 *                        value)
        !            71: {
        !            72:        
        !            73:        // if isReversed, returnValue = ((min - returnValue) + max)
        !            74:        if (reportItem->flags & kHIDReportItemFlag_Reversed)
        !            75:                *value = ((reportItem->globals.logicalMinimum - (*value)) + 
        !            76:                                                        reportItem->globals.logicalMaximum);
        !            77: 
        !            78:        return kHIDSuccess;
        !            79: }
        !            80: 
        !            81: /*
        !            82:  *------------------------------------------------------------------------------
        !            83:  *
        !            84:  * HIDPreProcessRIValue -      performs any pre-processing necessary for data 
        !            85:  *                                                     ouput _to_ a report for the specified report 
        !            86:  *                                                     item. Currently, the only pre-processing done 
        !            87:  *                                                     is reversing when appropriate
        !            88:  *
        !            89:  *      Input:
        !            90:  *                       reportItem                    - The report item
        !            91:  *                       value                                 - the value, destined for HIDPutData
        !            92:  *      Output:
        !            93:  *                       value                                 - The processed value
        !            94:  *      Returns:
        !            95:  *                       kHIDSuccess                   - Success
        !            96:  *
        !            97:  *------------------------------------------------------------------------------
        !            98: */
        !            99: 
        !           100: OSStatus HIDPreProcessRIValue  (HIDReportItem *                reportItem,
        !           101:                                                                SInt32 *                        value)
        !           102: {
        !           103:        
        !           104:        // if isReversed, returnValue = ((min - returnValue) + max)
        !           105:        if (reportItem->flags & kHIDReportItemFlag_Reversed)
        !           106:                *value = ((reportItem->globals.logicalMinimum - (*value)) + 
        !           107:                                                        reportItem->globals.logicalMaximum);
        !           108: 
        !           109:        return kHIDSuccess;
        !           110: }
        !           111:    
        !           112: 

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