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Annotation of ntddk/src/input/kbdclass/kbdclass.h, revision 1.1.1.1

1.1       root        1: /*++
                      2: 
                      3: Copyright (c) 1990, 1991, 1992, 1993  Microsoft Corporation
                      4: 
                      5: Module Name:
                      6: 
                      7:     kbdclass.h
                      8: 
                      9: Abstract:
                     10: 
                     11:     These are the structures and defines that are used in the
                     12:     keyboard class driver.
                     13: 
                     14: Revision History:
                     15: 
                     16: --*/
                     17: 
                     18: #ifndef _KBDCLASS_
                     19: #define _KBDCLASS_
                     20: 
                     21: #include <ntddkbd.h>
                     22: 
                     23: //
                     24: // Define the default number of elements in the class input data queue.
                     25: //
                     26: 
                     27: #define DATA_QUEUE_SIZE 100
                     28: 
                     29: //
                     30: // Class device extension.
                     31: //
                     32: 
                     33: typedef struct _DEVICE_EXTENSION {
                     34: 
                     35:     //
                     36:     // Flag that indicates whether there is currently a request held pending
                     37:     // by StartIo.
                     38:     //
                     39: 
                     40:     BOOLEAN RequestIsPending;
                     41: 
                     42:     //
                     43:     // Flag that indicates whether the cleanup routine has been initiated.
                     44:     //
                     45: 
                     46:     BOOLEAN CleanupWasInitiated;
                     47: 
                     48:     //
                     49:     // Number of input data items currently in the InputData queue.
                     50:     //
                     51: 
                     52:     ULONG InputCount;
                     53: 
                     54:     //
                     55:     // Start of the class input data queue (really a circular buffer).
                     56:     //
                     57: 
                     58:     PKEYBOARD_INPUT_DATA InputData;
                     59: 
                     60:     //
                     61:     // Insertion pointer for InputData.
                     62:     //
                     63: 
                     64:     PKEYBOARD_INPUT_DATA DataIn;
                     65: 
                     66:     //
                     67:     // Removal pointer for InputData.
                     68:     //
                     69: 
                     70:     PKEYBOARD_INPUT_DATA DataOut;
                     71: 
                     72:     //
                     73:     // Keyboard attributes.
                     74:     //
                     75: 
                     76:     KEYBOARD_ATTRIBUTES  KeyboardAttributes;
                     77: 
                     78:     //
                     79:     // Spinlock used to synchronize access to the input data queue and its
                     80:     // insertion/removal pointers.
                     81:     //
                     82: 
                     83:     KSPIN_LOCK SpinLock;
                     84: 
                     85:     //
                     86:     // Number of port drivers serviced by this class driver.
                     87:     //
                     88: 
                     89:     ULONG MaximumPortsServiced;
                     90: 
                     91:     //
                     92:     // Specifies the type of class-port connection to make.  A '1'
                     93:     // indicates a 1:1 relationship between class device objects and
                     94:     // port device objects.  A '0' indicates a 1:many relationship.
                     95:     //
                     96: 
                     97:     ULONG ConnectOneClassToOnePort;
                     98: 
                     99:     //
                    100:     // Pointer to the list of pointers to port device objects.
                    101:     //
                    102: 
                    103:     PDEVICE_OBJECT *PortDeviceObjectList;
                    104: 
                    105:     //
                    106:     // Request sequence number (used for error logging).
                    107:     //
                    108:     
                    109:     ULONG SequenceNumber;
                    110: 
                    111:     //
                    112:     // Indicates whether it is okay to log overflow errors.
                    113:     //
                    114: 
                    115:     BOOLEAN OkayToLogOverflow;
                    116: 
                    117: } DEVICE_EXTENSION, *PDEVICE_EXTENSION;
                    118: 
                    119: //
                    120: // Keyboard configuration information.  
                    121: //
                    122: 
                    123: typedef struct _KEYBOARD_CONFIGURATION_INFORMATION {
                    124: 
                    125:     //
                    126:     // Maximum size of class input data queue, in bytes.
                    127:     //
                    128: 
                    129:     ULONG  DataQueueSize;
                    130: 
                    131: } KEYBOARD_CONFIGURATION_INFORMATION, *PKEYBOARD_CONFIGURATION_INFORMATION;
                    132: 
                    133: #endif // _KBDCLASS_

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