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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDScaleUsageValue.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:           HIDScaleUsageValue.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>          3/5/99        BWS             first checked in
        !            46: */
        !            47: 
        !            48: #include "HIDLib.h"
        !            49: 
        !            50: /*
        !            51:  *------------------------------------------------------------------------------
        !            52:  *
        !            53:  * HIDScaleUsageValueIn
        !            54:  *
        !            55:  *      Input:
        !            56:  *                       ptReportItem                  - The ReportItem in which the data resides
        !            57:  *                       iValue                                - The unscaled data
        !            58:  *                       piScaledValue                 - The scaled value
        !            59:  *      Output:
        !            60:  *                       piScaledValue                 - The scaled value
        !            61:  *      Returns:
        !            62:  *                       kHIDSuccess
        !            63:  *
        !            64:  *------------------------------------------------------------------------------
        !            65: */
        !            66: OSStatus HIDScaleUsageValueIn (HIDReportItem *ptReportItem, UInt32 iValue, SInt32 *piScaledValue)
        !            67: {
        !            68:        long int lData;
        !            69:        long int lDeltaL;
        !            70:        long int lDeltaP;
        !            71:        long int lL, lP;
        !            72:        long int lScaledData;
        !            73:        long int lLMin, lLMax;
        !            74: /*
        !            75:  *     Disallow Null Pointers
        !            76: */
        !            77:        if ((ptReportItem == NULL) || (piScaledValue == NULL))
        !            78:                return kHIDNullPointerErr;
        !            79: /*
        !            80:  *     Convert the data to Long Integer
        !            81: */
        !            82:        lData = iValue;
        !            83: /*
        !            84:  *     range check the Logical Value
        !            85: */
        !            86:        lLMax = ptReportItem->globals.logicalMaximum;
        !            87:        lLMin = ptReportItem->globals.logicalMinimum;
        !            88:        if ((lData < lLMin) || (lData > lLMax))
        !            89:        {
        !            90:                if ((ptReportItem->dataModes & kHIDDataNullStateBit) == kHIDDataNullState)
        !            91:                        return kHIDNullStateErr;
        !            92:                return kHIDValueOutOfRangeErr;
        !            93:        }
        !            94: /*
        !            95:  *     (PhysicalValue - PhysicalMinimum)/(PhysicalMaximum - PhysicalMinimum)
        !            96:  *     = (LogicalValue - LogicalMinimum)/(LogicalMaximum - LogicalMinimum)
        !            97:  *
        !            98:  *     Calculate the ranges
        !            99:  *     Zero ranges are invalid!
        !           100:  *       lDeltaL = (LogicalMaximum - LogicalMinimum)
        !           101:  *       lDeltaP = (PhysicalMaximum - PhysicalMinimum)
        !           102: */
        !           103:        lDeltaL = lLMax - lLMin;
        !           104:        lDeltaP = ptReportItem->globals.physicalMaximum - ptReportItem->globals.physicalMinimum;
        !           105:        if ((lDeltaL == 0) || (lDeltaP == 0))
        !           106:                return kHIDBadLogPhysValuesErr;
        !           107: /*
        !           108:  *     (PhysicalValue - PhysicalMinimum)/lDeltaP
        !           109:  *     = (LogicalValue - LogicalMinimum)/lDeltaL
        !           110:  *     lL = (LogicalValue - LogicalMinimum)
        !           111: */
        !           112:        lL = lData - ptReportItem->globals.logicalMinimum;
        !           113: /*
        !           114:  *     (PhysicalValue - PhysicalMinimum)/lDeltaP = lL/lDeltaL
        !           115:  *     (PhysicalValue - PhysicalMinimum) = (lDeltaP * lL)/lDeltaL
        !           116:  *     lP = (PhysicalValue - PhysicalMinimum) = (lDeltaP * lL)/lDeltaL
        !           117: */
        !           118:        lP = (lL* lDeltaP)/lDeltaL;
        !           119: /*
        !           120:  *     lP = (PhysicalValue - PhysicalMinimum)
        !           121:  *     PhysicalValue = lP + PhysicalMinimum;
        !           122: */
        !           123:        lScaledData = lP + ptReportItem->globals.physicalMinimum;
        !           124:        *piScaledValue = (int) lScaledData;
        !           125:        return kHIDSuccess;
        !           126: }
        !           127: 
        !           128: /*
        !           129:  *------------------------------------------------------------------------------
        !           130:  *
        !           131:  * HIDScaleUsageValueOut
        !           132:  *
        !           133:  *      Input:
        !           134:  *                       ptReportItem                  - The ReportItem in which the data will go
        !           135:  *                       iValue                                - The unscaled data
        !           136:  *                       piScaledValue                 - The scaled value
        !           137:  *      Output:
        !           138:  *                       piScaledValue                 - The scaled value
        !           139:  *      Returns:
        !           140:  *                       kHIDSuccess
        !           141:  *
        !           142:  *------------------------------------------------------------------------------
        !           143: */
        !           144: OSStatus HIDScaleUsageValueOut (HIDReportItem *ptReportItem, UInt32 iValue, SInt32 *piScaledValue)
        !           145: {
        !           146:        long int lData;
        !           147:        long int lDeltaL;
        !           148:        long int lDeltaP;
        !           149:        long int lL, lP;
        !           150:        long int lPMax, lPMin;
        !           151: /*
        !           152:  *     Convert the data to Long Integer
        !           153: */
        !           154:        lData = iValue;
        !           155: /*
        !           156:  *     range check the Logical Value
        !           157: */
        !           158:        lPMax = ptReportItem->globals.physicalMaximum;
        !           159:        lPMin = ptReportItem->globals.physicalMinimum;
        !           160:        if ((lData < lPMin) || (lData > lPMax))
        !           161:        {
        !           162:                if ((ptReportItem->dataModes & kHIDDataNullStateBit) == kHIDDataNullState)
        !           163:                        return kHIDNullStateErr;
        !           164:                return kHIDValueOutOfRangeErr;
        !           165:        }
        !           166: /*
        !           167:  *     (PhysicalValue - PhysicalMinimum)/(PhysicalMaximum - PhysicalMinimum)
        !           168:  *     = (LogicalValue - LogicalMinimum)/(LogicalMaximum - LogicalMinimum)
        !           169:  *
        !           170:  *     Calculate the ranges
        !           171:  *     Zero ranges are invalid!
        !           172:  *       lDeltaL = (LogicalMaximum - LogicalMinimum)
        !           173:  *       lDeltaP = (PhysicalMaximum - PhysicalMinimum)
        !           174: */
        !           175:        lDeltaL = ptReportItem->globals.logicalMaximum - ptReportItem->globals.logicalMinimum;
        !           176:        lDeltaP = ptReportItem->globals.physicalMaximum - ptReportItem->globals.physicalMinimum;
        !           177:        if ((lDeltaL == 0) || (lDeltaP == 0))
        !           178:                return kHIDBadLogPhysValuesErr;
        !           179: /*
        !           180:  *     (PhysicalValue - PhysicalMinimum)/lDeltaP
        !           181:  *     = (LogicalValue - LogicalMinimum)/lDeltaL
        !           182:  *     lP = (PhysicalValue - PhysicalMinimum)
        !           183: */
        !           184:        lP = lData - ptReportItem->globals.physicalMinimum;
        !           185: /*
        !           186:  *     (LogicalValue - LogicalMinimum)/lDeltaL = lP/lDeltaP
        !           187:  *     (LogicalValue - LogicalMinimum)/lDeltaL = (lDeltaL * lP)/lDeltaP
        !           188:  *     lL = (LogicalValue - LogicalMinimum) = (lDeltaL * lP)/lDeltaP
        !           189: */
        !           190:        lL = (lP* lDeltaL)/lDeltaP;
        !           191: /*
        !           192:  *     lL = (LogicalValue - LogicalMinimum)
        !           193:  *     LogicalValue = lL + LogicalMinimum;
        !           194: */
        !           195:        lData = lL + ptReportItem->globals.logicalMinimum;
        !           196:        *piScaledValue = (int) lData;
        !           197:        return kHIDSuccess;
        !           198: }

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