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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: HIDProcessGlobalItem.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: (DF) David Ferguson
42: (BWS) Brent Schorsch
43:
44: Change History (most recent first):
45:
46: <USB2> 10/18/99 DF Lets try not reporting an error with zero report count
47: <USB1> 3/5/99 BWS first checked in
48: */
49:
50: #include "HIDLib.h"
51:
52: /*
53: *------------------------------------------------------------------------------
54: *
55: * HIDProcessGlobalItem - Process a GlobalItem
56: *
57: * Input:
58: * ptDescriptor - The Descriptor Structure
59: * ptPreparsedData - The PreParsedData Structure
60: * Output:
61: * ptDescriptor - The Descriptor Structure
62: * ptPreparsedData - The PreParsedData Structure
63: * Returns:
64: * kHIDSuccess - Success
65: * kHIDNullPointerErr - Argument, Pointer was Null
66: *
67: *------------------------------------------------------------------------------
68: */
69: OSStatus HIDProcessGlobalItem(HIDReportDescriptor *ptDescriptor, HIDPreparsedDataPtr ptPreparsedData)
70: {
71: HIDReportSizes *ptReport;
72: HIDGlobalItems *ptGlobals;
73: HIDItem *ptItem;
74: int reportIndex;
75: /*
76: * Disallow NULL Pointers
77: */
78: if ((ptDescriptor == NULL) || (ptPreparsedData == NULL))
79: return kHIDNullPointerErr;
80: /*
81: * Process by tag
82: */
83: ptItem = &ptDescriptor->item;
84: ptGlobals = &ptDescriptor->globals;
85: switch (ptItem->tag)
86: {
87: /*
88: * usage Page
89: */
90: case kHIDTagUsagePage:
91: if (ptItem->unsignedValue == 0)
92: return kHIDUsagePageZeroErr;
93: ptGlobals->usagePage = ptItem->unsignedValue;
94: break;
95: /*
96: * Logical Minimum
97: */
98: case kHIDTagLogicalMinimum:
99: ptGlobals->logicalMinimum = ptItem->signedValue;
100: break;
101: /*
102: * Logical Maximum
103: */
104: case kHIDTagLogicalMaximum:
105: ptGlobals->logicalMaximum = ptItem->signedValue;
106: break;
107: /*
108: * Physical Minimum
109: */
110: case kHIDTagPhysicalMinimum:
111: ptGlobals->physicalMinimum = ptItem->signedValue;
112: break;
113: /*
114: * Physical Maximum
115: */
116: case kHIDTagPhysicalMaximum:
117: ptGlobals->physicalMaximum = ptItem->signedValue;
118: break;
119: /*
120: * Unit Exponent
121: */
122: case kHIDTagUnitExponent:
123: ptGlobals->unitExponent = ptItem->signedValue;
124: break;
125: /*
126: * Unit
127: */
128: case kHIDTagUnit:
129: ptGlobals->units = ptItem->unsignedValue;
130: break;
131: /*
132: * Report Size in Bits
133: */
134: case kHIDTagReportSize:
135: ptGlobals->reportSize = ptItem->unsignedValue;
136: if (ptGlobals->reportSize == 0)
137: return kHIDReportSizeZeroErr;
138: break;
139: /*
140: * Report ID
141: */
142: case kHIDTagReportID:
143: if (ptItem->unsignedValue == 0)
144: return kHIDReportIDZeroErr;
145: /*
146: * Look for the Report ID in the table
147: */
148: reportIndex = 0;
149: while ((reportIndex < ptPreparsedData->reportCount)
150: && (ptPreparsedData->reports[reportIndex].reportID != ptItem->unsignedValue))
151: reportIndex++;
152: /*
153: * Initialize the entry if it's new and there's room for it
154: * Start with 8 bits for the Report ID
155: */
156: if (reportIndex == ptPreparsedData->reportCount)
157: {
158: ptReport = &ptPreparsedData->reports[ptPreparsedData->reportCount++];
159: ptReport->reportID = ptItem->unsignedValue;
160: ptReport->inputBitCount = 8;
161: ptReport->outputBitCount = 8;
162: ptReport->featureBitCount = 8;
163: }
164: /*
165: * Remember which report is being processed
166: */
167: ptGlobals->reportID = ptItem->unsignedValue;
168: ptGlobals->reportIndex = reportIndex;
169: break;
170: /*
171: * Report Count
172: */
173: case kHIDTagReportCount:
174: #if 0
175: // some device actually have a report count of zero specified. we must allow it!
176: if (ptItem->unsignedValue == 0)
177: return kHIDReportCountZeroErr;
178: #endif
179: ptGlobals->reportCount = ptItem->unsignedValue;
180: break;
181: /*
182: * Push Globals
183: */
184: case kHIDTagPush:
185: ptDescriptor->globalsStack[ptDescriptor->globalsNesting++] = ptDescriptor->globals;
186: break;
187: /*
188: * Pop Globals
189: */
190: case kHIDTagPop:
191: ptDescriptor->globals = ptDescriptor->globalsStack[--ptDescriptor->globalsNesting];
192: break;
193: }
194: return kHIDSuccess;
195: }
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