kbdcmn.c@ 21227

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1
2	/*++
3
4	Copyright (c) 1990, 1991, 1992, 1993 Microsoft Corporation
5
6	Module Name:
7
8	kbdcmn.c
9
10	Abstract:
11
12	The common portions of the Intel i8042 port driver which
13	apply to the keyboard device.
14
15	Environment:
16
17	Kernel mode only.
18
19	Notes:
20
21	NOTES: (Future/outstanding issues)
22
23	- Powerfail not implemented.
24
25	- Consolidate duplicate code, where possible and appropriate.
26
27	Revision History:
28
29	--*/
30
31	#include "stdarg.h"
32	#include "stdio.h"
33	#include "string.h"
34	#include "ntddk.h"
35	#include "i8042prt.h"
36
37
38
39	VOID
40	I8042KeyboardIsrDpc(
41	IN PKDPC Dpc,
42	IN PDEVICE_OBJECT DeviceObject,
43	IN PIRP Irp,
44	IN PVOID Context
45	)
46
47	/*++
48
49	Routine Description:
50
51	This routine runs at DISPATCH_LEVEL IRQL to finish processing
52	keyboard interrupts. It is queued in the keyboard ISR. The real
53	work is done via a callback to the connected keyboard class driver.
54
55	Arguments:
56
57	Dpc - Pointer to the DPC object.
58
59	DeviceObject - Pointer to the device object.
60
61	Irp - Pointer to the Irp.
62
63	Context - Not used.
64
65	Return Value:
66
67	None.
68
69	--*/
70
71	{
72
73	PDEVICE_EXTENSION deviceExtension;
74	GET_DATA_POINTER_CONTEXT getPointerContext;
75	SET_DATA_POINTER_CONTEXT setPointerContext;
76	VARIABLE_OPERATION_CONTEXT operationContext;
77	PVOID classService;
78	PVOID classDeviceObject;
79	LONG interlockedResult;
80	BOOLEAN moreDpcProcessing;
81	ULONG dataNotConsumed = 0;
82	ULONG inputDataConsumed = 0;
83	LARGE_INTEGER deltaTime;
84
85	UNREFERENCED_PARAMETER(Dpc);
86	UNREFERENCED_PARAMETER(Irp);
87	UNREFERENCED_PARAMETER(Context);
88
89	I8xPrint((2, "I8042PRT-I8042KeyboardIsrDpc: enter\n"));
90
91	deviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
92
93	//
94	// Use DpcInterlockKeyboard to determine whether the DPC is running
95	// concurrently on another processor. We only want one instantiation
96	// of the DPC to actually do any work. DpcInterlockKeyboard is -1
97	// when no DPC is executing. We increment it, and if the result is
98	// zero then the current instantiation is the only one executing, and it
99	// is okay to proceed. Otherwise, we just return.
100	//
101	//
102
103	operationContext.VariableAddress =
104	&deviceExtension->DpcInterlockKeyboard;
105	operationContext.Operation = IncrementOperation;
106	operationContext.NewValue = &interlockedResult;
107
108	KeSynchronizeExecution(
109	deviceExtension->KeyboardInterruptObject,
110	(PKSYNCHRONIZE_ROUTINE) I8xDpcVariableOperation,
111	(PVOID) &operationContext
112	);
113
114	moreDpcProcessing = (interlockedResult == 0)? TRUE:FALSE;
115
116	while (moreDpcProcessing) {
117
118	dataNotConsumed = 0;
119	inputDataConsumed = 0;
120
121	//
122	// Get the port InputData queue pointers synchronously.
123	//
124
125	getPointerContext.DeviceExtension = deviceExtension;
126	setPointerContext.DeviceExtension = deviceExtension;
127	getPointerContext.DeviceType = (CCHAR) KeyboardDeviceType;
128	setPointerContext.DeviceType = (CCHAR) KeyboardDeviceType;
129	setPointerContext.InputCount = 0;
130
131	KeSynchronizeExecution(
132	deviceExtension->KeyboardInterruptObject,
133	(PKSYNCHRONIZE_ROUTINE) I8xGetDataQueuePointer,
134	(PVOID) &getPointerContext
135	);
136
137	if (getPointerContext.InputCount != 0) {
138
139	//
140	// Call the connected class driver's callback ISR with the
141	// port InputData queue pointers. If we have to wrap the queue,
142	// break the operation into two pieces, and call the class
143	// callback ISR once for each piece.
144	//
145
146	classDeviceObject =
147	deviceExtension->KeyboardExtension.ConnectData.ClassDeviceObject;
148	classService =
149	deviceExtension->KeyboardExtension.ConnectData.ClassService;
150	ASSERT(classService != NULL);
151
152	if (getPointerContext.DataOut >= getPointerContext.DataIn) {
153
154	//
155	// We'll have to wrap the InputData circular buffer. Call
156	// the class callback ISR with the chunk of data starting at
157	// DataOut and ending at the end of the queue.
158	//
159
160	I8xPrint((
161	2,
162	"I8042PRT-I8042KeyboardIsrDpc: calling class callback\n"
163	));
164	I8xPrint((
165	2,
166	"I8042PRT-I8042KeyboardIsrDpc: with Start 0x%x and End 0x%x\n",
167	getPointerContext.DataOut,
168	deviceExtension->KeyboardExtension.DataEnd
169	));
170
171	(*(PSERVICE_CALLBACK_ROUTINE) classService)(
172	classDeviceObject,
173	getPointerContext.DataOut,
174	deviceExtension->KeyboardExtension.DataEnd,
175	&inputDataConsumed
176	);
177
178	dataNotConsumed = (((PUCHAR)
179	deviceExtension->KeyboardExtension.DataEnd -
180	(PUCHAR) getPointerContext.DataOut)
181	/ sizeof(KEYBOARD_INPUT_DATA)) - inputDataConsumed;
182
183	I8xPrint((
184	2,
185	"I8042PRT-I8042KeyboardIsrDpc: (Wrap) Call callback consumed %d items, left %d\n",
186	inputDataConsumed,
187	dataNotConsumed
188	));
189
190	setPointerContext.InputCount += inputDataConsumed;
191
192	if (dataNotConsumed) {
193	setPointerContext.DataOut =
194	((PUCHAR)getPointerContext.DataOut) +
195	(inputDataConsumed * sizeof(KEYBOARD_INPUT_DATA));
196	} else {
197	setPointerContext.DataOut =
198	deviceExtension->KeyboardExtension.InputData;
199	getPointerContext.DataOut = setPointerContext.DataOut;
200	}
201	}
202
203	//
204	// Call the class callback ISR with data remaining in the queue.
205	//
206
207	if ((dataNotConsumed == 0) &&
208	(inputDataConsumed < getPointerContext.InputCount)){
209	I8xPrint((
210	2,
211	"I8042PRT-I8042KeyboardIsrDpc: calling class callback\n"
212	));
213	I8xPrint((
214	2,
215	"I8042PRT-I8042KeyboardIsrDpc: with Start 0x%x and End 0x%x\n",
216	getPointerContext.DataOut,
217	getPointerContext.DataIn
218	));
219
220	(*(PSERVICE_CALLBACK_ROUTINE) classService)(
221	classDeviceObject,
222	getPointerContext.DataOut,
223	getPointerContext.DataIn,
224	&inputDataConsumed
225	);
226
227	dataNotConsumed = (((PUCHAR) getPointerContext.DataIn -
228	(PUCHAR) getPointerContext.DataOut)
229	/ sizeof(KEYBOARD_INPUT_DATA)) - inputDataConsumed;
230
231	I8xPrint((
232	2,
233	"I8042PRT-I8042KeyboardIsrDpc: Call callback consumed %d items, left %d\n",
234	inputDataConsumed,
235	dataNotConsumed
236	));
237
238	setPointerContext.DataOut =
239	((PUCHAR)getPointerContext.DataOut) +
240	(inputDataConsumed * sizeof(KEYBOARD_INPUT_DATA));
241	setPointerContext.InputCount += inputDataConsumed;
242
243	}
244
245	//
246	// Update the port InputData queue DataOut pointer and InputCount
247	// synchronously.
248	//
249
250	KeSynchronizeExecution(
251	deviceExtension->KeyboardInterruptObject,
252	(PKSYNCHRONIZE_ROUTINE) I8xSetDataQueuePointer,
253	(PVOID) &setPointerContext
254	);
255
256	}
257
258	if (dataNotConsumed) {
259
260	//
261	// The class driver was unable to consume all the data.
262	// Reset the interlocked variable to -1. We do not want
263	// to attempt to move more data to the class driver at this
264	// point, because it is already overloaded. Need to wait a
265	// while to give the Raw Input Thread a chance to read some
266	// of the data out of the class driver's queue. We accomplish
267	// this "wait" via a timer.
268	//
269
270	I8xPrint((2, "I8042PRT-I8042KeyboardIsrDpc: set timer in DPC\n"));
271
272	operationContext.Operation = WriteOperation;
273	interlockedResult = -1;
274	operationContext.NewValue = &interlockedResult;
275
276	KeSynchronizeExecution(
277	deviceExtension->KeyboardInterruptObject,
278	(PKSYNCHRONIZE_ROUTINE) I8xDpcVariableOperation,
279	(PVOID) &operationContext
280	);
281
282	deltaTime.LowPart = (ULONG)(-10 * 1000 * 1000);
283	deltaTime.HighPart = -1;
284
285	(VOID) KeSetTimer(
286	&deviceExtension->KeyboardExtension.DataConsumptionTimer,
287	deltaTime,
288	&deviceExtension->KeyboardIsrDpcRetry
289	);
290
291	moreDpcProcessing = FALSE;
292
293	} else {
294
295	//
296	// Decrement DpcInterlockKeyboard. If the result goes negative,
297	// then we're all finished processing the DPC. Otherwise, either
298	// the ISR incremented DpcInterlockKeyboard because it has more
299	// work for the ISR DPC to do, or a concurrent DPC executed on
300	// some processor while the current DPC was running (the
301	// concurrent DPC wouldn't have done any work). Make sure that
302	// the current DPC handles any extra work that is ready to be
303	// done.
304	//
305
306	operationContext.Operation = DecrementOperation;
307	operationContext.NewValue = &interlockedResult;
308
309	KeSynchronizeExecution(
310	deviceExtension->KeyboardInterruptObject,
311	(PKSYNCHRONIZE_ROUTINE) I8xDpcVariableOperation,
312	(PVOID) &operationContext
313	);
314
315	if (interlockedResult != -1) {
316
317	//
318	// The interlocked variable is still greater than or equal to
319	// zero. Reset it to zero, so that we execute the loop one
320	// more time (assuming no more DPCs execute and bump the
321	// variable up again).
322	//
323
324	operationContext.Operation = WriteOperation;
325	interlockedResult = 0;
326	operationContext.NewValue = &interlockedResult;
327
328	KeSynchronizeExecution(
329	deviceExtension->KeyboardInterruptObject,
330	(PKSYNCHRONIZE_ROUTINE) I8xDpcVariableOperation,
331	(PVOID) &operationContext
332	);
333
334	I8xPrint((2, "I8042PRT-I8042KeyboardIsrDpc: loop in DPC\n"));
335	} else {
336	moreDpcProcessing = FALSE;
337	}
338	}
339
340	}
341
342	I8xPrint((2, "I8042PRT-I8042KeyboardIsrDpc: exit\n"));
343
344	}
345
346
347	BOOLEAN
348	I8xWriteDataToKeyboardQueue(
349	PPORT_KEYBOARD_EXTENSION KeyboardExtension,
350	IN PKEYBOARD_INPUT_DATA InputData
351	)
352
353	/*++
354
355	Routine Description:
356
357	This routine adds input data from the keyboard to the InputData queue.
358
359	Arguments:
360
361	KeyboardExtension - Pointer to the keyboard portion of the device extension.
362
363	InputData - Pointer to the data to add to the InputData queue.
364
365	Return Value:
366
367	Returns TRUE if the data was added, otherwise FALSE.
368
369	--*/
370
371	{
372
373	PKEYBOARD_INPUT_DATA previousDataIn;
374
375	I8xPrint((2,"I8042PRT-I8xWriteDataToKeyboardQueue: enter\n"));
376	I8xPrint((
377	3,
378	"I8042PRT-I8xWriteDataToKeyboardQueue: DataIn 0x%x, DataOut 0x%x\n",
379	KeyboardExtension->DataIn,
380	KeyboardExtension->DataOut
381	));
382	I8xPrint((
383	3,
384	"I8042PRT-I8xWriteDataToKeyboardQueue: InputCount %d\n",
385	KeyboardExtension->InputCount
386	));
387
388	//
389	// Check for full input data queue.
390	//
391
392	if ((KeyboardExtension->DataIn == KeyboardExtension->DataOut) &&
393	(KeyboardExtension->InputCount != 0)) {
394
395	//
396	// Queue overflow. Replace the previous input data packet
397	// with a keyboard overrun data packet, thus losing both the
398	// previous and the current input data packet.
399	//
400
401	I8xPrint((1,"I8042PRT-I8xWriteDataToKeyboardQueue: OVERFLOW\n"));
402
403	if (KeyboardExtension->DataIn == KeyboardExtension->InputData) {
404	I8xPrint((2,"I8042PRT-I8xWriteDataToKeyboardQueue: wrap buffer\n"));
405	previousDataIn = KeyboardExtension->DataEnd;
406	} else {
407	previousDataIn = KeyboardExtension->DataIn - 1;
408	}
409
410	previousDataIn->MakeCode = KEYBOARD_OVERRUN_MAKE_CODE;
411	previousDataIn->Flags = 0;
412
413	I8xPrint((2,"I8042PRT-I8xWriteDataToKeyboardQueue: exit\n"));
414	return(FALSE);
415
416	} else {
417	(KeyboardExtension->DataIn) = InputData;
418	KeyboardExtension->InputCount += 1;
419	KeyboardExtension->DataIn++;
420	I8xPrint((
421	2,
422	"I8042PRT-I8xWriteDataToKeyboardQueue: new InputCount %d\n",
423	KeyboardExtension->InputCount
424	));
425	if (KeyboardExtension->DataIn ==
426	KeyboardExtension->DataEnd) {
427	I8xPrint((2,"I8042PRT-I8xWriteDataToKeyboardQueue: wrap buffer\n"));
428	KeyboardExtension->DataIn = KeyboardExtension->InputData;
429	}
430	}
431
432	I8xPrint((2,"I8042PRT-I8xWriteDataToKeyboardQueue: exit\n"));
433
434	return(TRUE);
435	}
436

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source: vbox/trunk/src/VBox/Additions/WINNT/i8042prt/kbdcmn.c@ 21227

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