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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDGetCaps.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:           HIDGetCaps.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:          <USB2>         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. This means we
        !            48:                                                                        need to pass an additional parameter to some internal functions
        !            49:          <USB1>          3/5/99        BWS             first checked in
        !            50: */
        !            51: 
        !            52: #include "HIDLib.h"
        !            53: 
        !            54: /*
        !            55:  *------------------------------------------------------------------------------
        !            56:  *
        !            57:  * HIDP_GetCaps
        !            58:  *
        !            59:  *      Input:
        !            60:  *                       ptPreparsedData               - Pre-Parsed Data
        !            61:  *                       ptCapabilities                - Pointer to caller-provided structure
        !            62:  *      Output:
        !            63:  *                       ptCapabilities                - Capabilities data
        !            64:  *      Returns:
        !            65:  *
        !            66:  *------------------------------------------------------------------------------
        !            67: */
        !            68: OSStatus HIDGetCaps(HIDPreparsedDataRef preparsedDataRef, HIDCapsPtr ptCapabilities)
        !            69: {
        !            70:        HIDPreparsedDataPtr ptPreparsedData = (HIDPreparsedDataPtr) preparsedDataRef;
        !            71:        HIDCollection *ptCollection;
        !            72:        HIDReportItem *ptReportItem;
        !            73:        HIDReportSizes *ptReport;
        !            74:        int iFirstUsage;
        !            75:        int i;
        !            76: /*
        !            77:  *     Disallow Null Pointers
        !            78: */
        !            79: 
        !            80:        if ((ptPreparsedData == NULL) || (ptCapabilities == NULL))
        !            81:                return kHIDNullPointerErr;
        !            82:        if (ptPreparsedData->hidTypeIfValid != kHIDOSType)
        !            83:                return kHIDInvalidPreparsedDataErr;
        !            84: /*
        !            85:  *     Copy the capabilities to the user
        !            86:  *     Collection Capabilities
        !            87: */
        !            88: 
        !            89:        ptCollection = &ptPreparsedData->collections[1];
        !            90:        ptCapabilities->usagePage = ptCollection->usagePage;
        !            91:        iFirstUsage = ptCollection->firstUsageItem;
        !            92:        ptCapabilities->usage = ptPreparsedData->usageItems[iFirstUsage].usage;
        !            93:        ptCapabilities->numberCollectionNodes = ptPreparsedData->collectionCount;
        !            94: /*
        !            95:  *     Report Capabilities Summary
        !            96: */
        !            97: 
        !            98:        ptCapabilities->inputReportByteLength = 0;
        !            99:        ptCapabilities->outputReportByteLength = 0;
        !           100:        ptCapabilities->featureReportByteLength = 0;
        !           101:        for (i=0; i<ptPreparsedData->reportCount; i++)
        !           102:        {
        !           103:                ptReport = &ptPreparsedData->reports[i];
        !           104:                if (ptCapabilities->inputReportByteLength < ptReport->inputBitCount)
        !           105:                        ptCapabilities->inputReportByteLength = ptReport->inputBitCount;
        !           106:                if (ptCapabilities->outputReportByteLength < ptReport->outputBitCount)
        !           107:                        ptCapabilities->outputReportByteLength = ptReport->outputBitCount;
        !           108:                if (ptCapabilities->featureReportByteLength < ptReport->featureBitCount)
        !           109:                        ptCapabilities->featureReportByteLength = ptReport->featureBitCount;
        !           110:        }
        !           111:        ptCapabilities->inputReportByteLength = (ptCapabilities->inputReportByteLength + 7) /8;
        !           112:        ptCapabilities->outputReportByteLength = (ptCapabilities->outputReportByteLength + 7)/8;
        !           113:        ptCapabilities->featureReportByteLength = (ptCapabilities->featureReportByteLength + 7)/8;
        !           114: /*
        !           115:  *     Sum the capabilities types
        !           116: */
        !           117: 
        !           118:        ptCapabilities->numberInputButtonCaps = 0;
        !           119:        ptCapabilities->numberInputValueCaps = 0;
        !           120:        ptCapabilities->numberOutputButtonCaps = 0;
        !           121:        ptCapabilities->numberOutputValueCaps = 0;
        !           122:        ptCapabilities->numberFeatureButtonCaps = 0;
        !           123:        ptCapabilities->numberFeatureValueCaps = 0;
        !           124:        for (i=0; i<ptPreparsedData->reportItemCount; i++)
        !           125:        {
        !           126:                ptReportItem = &ptPreparsedData->reportItems[i];
        !           127:                switch (ptReportItem->reportType)
        !           128:                {
        !           129:                        case kHIDInputReport:
        !           130:                                if (HIDIsButton(ptReportItem, preparsedDataRef))
        !           131:                                        ptCapabilities->numberInputButtonCaps += ptReportItem->usageItemCount;
        !           132:                                else if (HIDIsVariable(ptReportItem, preparsedDataRef))
        !           133:                                        ptCapabilities->numberInputValueCaps += ptReportItem->usageItemCount;
        !           134:                                break;
        !           135:                        case kHIDOutputReport:
        !           136:                                if (HIDIsButton(ptReportItem, preparsedDataRef))
        !           137:                                        ptCapabilities->numberOutputButtonCaps += ptReportItem->usageItemCount;
        !           138:                                else if (HIDIsVariable(ptReportItem, preparsedDataRef))
        !           139:                                        ptCapabilities->numberOutputValueCaps += ptReportItem->usageItemCount;
        !           140:                                break;
        !           141:                        case kHIDFeatureReport:
        !           142:                                if (HIDIsButton(ptReportItem, preparsedDataRef))
        !           143:                                        ptCapabilities->numberFeatureButtonCaps += ptReportItem->usageItemCount;
        !           144:                                else if (HIDIsVariable(ptReportItem, preparsedDataRef))
        !           145:                                        ptCapabilities->numberFeatureValueCaps += ptReportItem->usageItemCount;
        !           146:                                break;
        !           147:                }
        !           148:        }
        !           149:        return kHIDSuccess;
        !           150: }

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