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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDIsButtonOrValue.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:           HIDIsButtonOrValue.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:          <USB3>         11/1/99        BWS             [2405720]  We need a better check for 'bit padding' items,
        !            46:                                                                        rather than just is constant. We will check to make sure the
        !            47:                                                                        item is constant, and has no usage, or zero usage.
        !            48:          <USB2>          3/5/99        BWS             [2311366]  HIDIsButton should screen out constants (at least
        !            49:                                                                        until other functions, like HIDGetButtons, are fixed to be able
        !            50:                                                                        to properly skip constants)
        !            51:          <USB1>          3/5/99        BWS             first checked in
        !            52: */
        !            53: 
        !            54: #include "HIDLib.h"
        !            55: 
        !            56: /*
        !            57:  *-----------------------------------------------------------------------------
        !            58:  *
        !            59:  * HIDIsButton - Is the data button(s)?
        !            60:  *
        !            61:  *      Input:
        !            62:  *                       ptReportItem                  - Input/Output/Feature
        !            63:  *      Output:
        !            64:  *      Returns:
        !            65:  *                       Boolean
        !            66:  *
        !            67:  *-----------------------------------------------------------------------------
        !            68: */
        !            69: Boolean HIDIsButton(HIDReportItem *ptReportItem, HIDPreparsedDataRef preparsedDataRef)
        !            70: {
        !            71:        HIDPreparsedDataPtr ptPreparsedData = (HIDPreparsedDataPtr) preparsedDataRef;
        !            72: 
        !            73: /*
        !            74:  *     Disallow Null Pointers
        !            75: */
        !            76:        if (ptReportItem==NULL)
        !            77:                return false;
        !            78: /*
        !            79:  *     Remove items that are constant and have no usage
        !            80:  */
        !            81:        if ((ptReportItem->dataModes & kHIDDataConstantBit) == kHIDDataConstant)
        !            82:        {
        !            83:                // if has no usages, then bit filler
        !            84:                if (ptReportItem->usageItemCount == 0)
        !            85:                        return false;
        !            86:                
        !            87:                // also check to see if there is a usage, but it is zero
        !            88:                
        !            89:                // if the first usage item is range, then check that one
        !            90:                // (we will not worry about report items with multiple zero usages, 
        !            91:                //  as I dont think that is a case that makes sense)
        !            92:                if (ptReportItem->firstUsageItem < ptPreparsedData->usageItemCount)
        !            93:                {
        !            94:                        HIDP_UsageItem * ptUsageItem = &ptPreparsedData->usageItems[ptReportItem->firstUsageItem];
        !            95:                        
        !            96:                        // if it is a range usage, with both zero usages 
        !            97:                        if ((ptUsageItem->isRange && ptUsageItem->usageMinimum == 0 && ptUsageItem->usageMaximum == 0) &&
        !            98:                                // or not a range, and zero usage
        !            99:                                (!ptUsageItem->isRange && ptUsageItem->usage == 0))
        !           100:                                // then this is bit filler
        !           101:                                return false;
        !           102:                }
        !           103:        }
        !           104: 
        !           105: /*
        !           106:  *     Arrays and 1-bit Variables
        !           107: */
        !           108:        return (((ptReportItem->dataModes & kHIDDataArrayBit) == kHIDDataArray)
        !           109:           || (ptReportItem->globals.reportSize == 1));
        !           110: }
        !           111: 
        !           112: /*
        !           113:  *-----------------------------------------------------------------------------
        !           114:  *
        !           115:  * HIDIsVariable - Is the data variable(s)?
        !           116:  *
        !           117:  *      Input:
        !           118:  *                       ptReportItem                  - Input/Output/Feature
        !           119:  *      Output:
        !           120:  *      Returns:
        !           121:  *                       Boolean
        !           122:  *
        !           123:  *-----------------------------------------------------------------------------
        !           124: */
        !           125: Boolean HIDIsVariable(HIDReportItem *ptReportItem, HIDPreparsedDataRef preparsedDataRef)
        !           126: {
        !           127:        HIDPreparsedDataPtr ptPreparsedData = (HIDPreparsedDataPtr) preparsedDataRef;
        !           128: 
        !           129: /*
        !           130:  *     Disallow Null Pointers
        !           131: */
        !           132:        if (ptReportItem==NULL)
        !           133:                return false;
        !           134: 
        !           135: /*
        !           136:  *     Remove items that are constant and have no usage
        !           137:  */
        !           138:        if ((ptReportItem->dataModes & kHIDDataConstantBit) == kHIDDataConstant)
        !           139:        {
        !           140:                // if has no usages, then bit filler
        !           141:                if (ptReportItem->usageItemCount == 0)
        !           142:                        return false;
        !           143:                
        !           144:                // also check to see if there is a usage, but it is zero
        !           145:                
        !           146:                // if the first usage item is range, then check that one
        !           147:                // (we will not worry about report items with multiple zero usages, 
        !           148:                //  as I dont think that is a case that makes sense)
        !           149:                if (ptReportItem->firstUsageItem < ptPreparsedData->usageItemCount)
        !           150:                {
        !           151:                        HIDP_UsageItem * ptUsageItem = &ptPreparsedData->usageItems[ptReportItem->firstUsageItem];
        !           152:                        
        !           153:                        // if it is a range usage, with both zero usages 
        !           154:                        if ((ptUsageItem->isRange && ptUsageItem->usageMinimum == 0 && ptUsageItem->usageMaximum == 0) &&
        !           155:                                // or not a range, and zero usage
        !           156:                                (!ptUsageItem->isRange && ptUsageItem->usage == 0))
        !           157:                                // then this is bit filler
        !           158:                                return false;
        !           159:                }
        !           160:        }
        !           161: 
        !           162: /*
        !           163:  *     Multi-bit Variables
        !           164: */
        !           165:        return (((ptReportItem->dataModes & kHIDDataArrayBit) != kHIDDataArray)
        !           166:           && (ptReportItem->globals.reportSize != 1));
        !           167: }

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