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Annotation of kernel/bsd/dev/ppc/drvUSBCMD/CompositeClassDriver/ConfigParse.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:        File:           ConfigParse.c
                     27: 
                     28:        Contains:       xxx put contents here xxx
                     29: 
                     30:        Version:        xxx put version here xxx
                     31: 
                     32:        Copyright:      � 1998 by Apple Computer, Inc., all rights reserved.
                     33: 
                     34:        File Ownership:
                     35: 
                     36:                DRI:                            Craig Keithley
                     37: 
                     38:                Other Contact:          xxx put other contact here xxx
                     39: 
                     40:                Technology:                     xxx put technology here xxx
                     41: 
                     42:        Writers:
                     43: 
                     44:                (BG)    Bill Galcher
                     45:                (CJK)   Craig Keithley
                     46: 
                     47:        Change History (most recent first):
                     48: 
                     49:          <USB5>         6/29/98        CJK             change total length so that it's properly byte swapped.
                     50:          <USB4>          6/5/98        CJK             remove XXGetEndPointDescriptor function (not needed)
                     51:          <USB3>         5/19/98        BG              Fix some casting problems.
                     52:          <USB2>          4/9/98        CJK             change to use USB.h
                     53:                 <1>      4/7/98        CJK             first checked in as USBCompositeClassDriver
                     54:                 <8>     3/17/98        CJK             Replace "};" with just "}" (where required by MW).  Also used
                     55:                                                                        extractprototypes to get the function prototypes out of this
                     56:                                                                        file and into the header file.
                     57:                 <7>      3/9/98        CJK             Fix RADAR #2216609 (Duplicate sets of enums)
                     58:                 <6>      2/9/98        CJK             remove get hid descriptor function
                     59:                 <5>      2/9/98        CJK             remove HIDEmulation.h include
                     60:                 <4>      2/2/98        CJK             Add get hid descriptor call
                     61:                 <3>     1/26/98        CJK             Change to use structure field names as required by codebert
                     62:                 <2>     1/23/98        CJK             Work on configuration parsing
                     63: */
                     64: 
                     65: //#include <Types.h>
                     66: //#include <Devices.h>
                     67: //#include <processes.h>
                     68: #include "../driverservices.h"
                     69: #include "../USB.h"
                     70: 
                     71: #include "CompositeClassDriver.h"
                     72: 
                     73: OSErr GetInterfaceDescriptor(LogicalAddress pConfigDesc, UInt32 ReqInterface, USBInterfaceDescriptorPtr * hInterfaceDesc)
                     74: {
                     75: UInt32 totalLength;
                     76: void * pEndOfDescriptors;
                     77: USBInterfaceDescriptorPtr      pMyIntDesc;
                     78: USBDescriptorHeaderPtr         pCurrentDesc;
                     79: unsigned long                          anAddress, anOffset;
                     80: 
                     81:        totalLength = USBToHostWord(((USBConfigurationDescriptorPtr)pConfigDesc)->totalLength);
                     82:        pEndOfDescriptors = (Ptr)pConfigDesc + totalLength;                             // get the total length and add it to the start of the config space
                     83:        pCurrentDesc = (USBDescriptorHeaderPtr)pConfigDesc;                             // point the currentdesc to the start of the config space
                     84:        
                     85:        while (pCurrentDesc < pEndOfDescriptors)                                                // as long as we haven't exhausted all the descriptors
                     86:        {
                     87:                if (pCurrentDesc->descriptorType == kUSBInterfaceDesc)          // look at the current descriptor
                     88:                {
                     89:                        pMyIntDesc = (USBInterfaceDescriptorPtr)pCurrentDesc;   // if it's an interface descriptor
                     90:                        if (pMyIntDesc->interfaceNumber == ReqInterface)                // see if it's the request descriptor
                     91:                        {
                     92:                                *hInterfaceDesc = pMyIntDesc;                                           // if it is, then return with hInterfaceDesc set to the
                     93:                                return kUSBNoErr;                                                                                       // current descriptor pointer
                     94:                        }
                     95:                }
                     96:                anAddress = (unsigned long) pCurrentDesc;                                       // Nope, that either wasn't an interface descriptor
                     97:                anOffset  = (unsigned long) pCurrentDesc->length;
                     98:                anAddress += anOffset;
                     99:                pCurrentDesc = (USBDescriptorHeaderPtr) anAddress;
                    100:        }                                                                                                                               // or it was, but not the droid we're looking for.
                    101:        return -1;
                    102: }

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