Question about reader USB multislot

NTDEV
1

Hello everybody,
It’s my first post and i hope you help me for my problems.

I try to develop driver PCSC for a smartcardreader multislot USB.

i would like to know the best solution for using the reader.
For the moment i have 2 .sys.
_ the first is for USB driver (the parent)
_ the second is for slots (child)

My problem is the communication Bus to SLOT.

with the function “IoGetDeviceObjectPointer” in the slot driver i arrive to point to the bus driver.
But the bus driver work with the endpoint interrupt, so it’s the bus that start the communication to slot.

for the moment I found a solution, Slots send an IRP to the bus for poll the endpointInterruptIN, and if there are a cardInserted I update a buffer with the response of the interrupt and I copy this response in the IRP before the completion.

The problem is this polling.

I would like to know if it’s possible to communicate directly when I have an InterruptIN to the concerned Slots.

And the last question.
when I create my Bus driver I use this function “IoRegisterDeviceInterface” for create a symbolicLink.
How to proceed for catch this name when I create my SLots ???
It’s possible to use the registry for write this name with the bus and read this value by the slots ?

Thank you,

Best regards,

ps : sorry for my level in english.

2

You should pend the IRPs from the slot drivers in your bus driver, and only complete them when there is a change from the interrupt endpoint. If there was a slot notification while there wasn’t an IRP pending, you will probably want to save this data until the IRP arrives.

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of xxxxx@hotmail.com
Sent: Tuesday, June 24, 2008 2:41 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] Question about reader USB multislot

Hello everybody,
It’s my first post and i hope you help me for my problems.

I try to develop driver PCSC for a smartcardreader multislot USB.

i would like to know the best solution for using the reader.
For the moment i have 2 .sys.
_ the first is for USB driver (the parent)
_ the second is for slots (child)

My problem is the communication Bus to SLOT.

with the function “IoGetDeviceObjectPointer” in the slot driver i arrive to point to the bus driver.
But the bus driver work with the endpoint interrupt, so it’s the bus that start the communication to slot.

for the moment I found a solution, Slots send an IRP to the bus for poll the endpointInterruptIN, and if there are a cardInserted I update a buffer with the response of the interrupt and I copy this response in the IRP before the completion.

The problem is this polling.

I would like to know if it’s possible to communicate directly when I have an InterruptIN to the concerned Slots.

And the last question.
when I create my Bus driver I use this function “IoRegisterDeviceInterface” for create a symbolicLink.
How to proceed for catch this name when I create my SLots ???
It’s possible to use the registry for write this name with the bus and read this value by the slots ?

Thank you,

Best regards,

ps : sorry for my level in english.

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3

Thank you Randy for your response.
I already try to pend my IRP.
But the problem is the Slot is blocked and it’s impossible to communicate with the slot during this pending.
For exemple if I launch a PCSC Tools (Smartdiag) this tools doesn’t work until the IRP has been completed.
I have try to create a thread but I have the same result.

Could you explain me a method for use a thread not blocked that send an IRP .
And even if the IRP is not completed the slot continue to work.

Thank you for your futur response.

Best regards,
Kamel

4

Is the slot driver synchronously waiting for the irp to complete? If so, you can process it asynchronously by setting a completion routine and processing the results in the completion routine instead of waiting for it to complete.

d

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of xxxxx@hotmail.com
Sent: Tuesday, June 24, 2008 9:05 AM
To: Windows System Software Devs Interest List
Subject: RE:[ntdev] Question about reader USB multislot

Thank you Randy for your response.
I already try to pend my IRP.
But the problem is the Slot is blocked and it’s impossible to communicate with the slot during this pending.
For exemple if I launch a PCSC Tools (Smartdiag) this tools doesn’t work until the IRP has been completed.
I have try to create a thread but I have the same result.

Could you explain me a method for use a thread not blocked that send an IRP .
And even if the IRP is not completed the slot continue to work.

Thank you for your futur response.

Best regards,
Kamel

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5

thank you Doron,
I don’t understand what you asked me, sorry.
Instead of wait the “IoCompleteRequest (Irp, IO_NO_INCREMENT);” for the completion.
I can continue to use my slot without complete the IRP request ?
But how to proceed for complete asynchronously the request and complete it just when there is an interruptIN.

My problem is I always my thread for send this IRP.
The best solution for me is to execute this thread only when I have an Interrupt.
But I don’t know how to proceed for catch the result directly in the completion and not wait the “IoCompleteRequest”

Please could you help me for know if it’s possible or not

Thanks,

6

Doron Holan said :
Is the slot driver synchronously waiting for the irp to complete? If so, you can process it asynchronously by setting a completion routine and processing the results in the completion routine instead of waiting for it to complete.

You can look how process my function, the problem if I catch the IRP in my Bus driver and I don’t complete the IRP my slot are blocked until the IRP was completed “IoCompleteRequest”

NTSTATUS
ccid_SendDeviceInterrupt2(PDEVICE_OBJECT deviceObject)
{
NTSTATUS status;
IO_STATUS_BLOCK ioStatus;
KEVENT event;
PIRP irp;
PIO_STACK_LOCATION irpNextStack;
PDEVICE_EXTENSION deviceExtension = (PDEVICE_EXTENSION)deviceObject->DeviceExtension;
PSMARTCARD_EXTENSION SmartcardExtension = &deviceExtension->SmartcardExtension;
ULONG sizeSlotNumber=(ULONG)SmartcardExtension->ReaderExtension->bSlot;

do {

KeInitializeEvent(
&event,
NotificationEvent,
FALSE
);

SmartcardExtension->ReaderExtension->SlotIoControlCode = IOCTL_SEND_DEVICE_INT;

// Build irp to be sent to serial driver
irp = IoBuildDeviceIoControlRequest(
IOCTL_SEND_DEVICE_INT,
SmartcardExtension->ReaderExtension->SlotConnected,
BufferLocalInterrupt,
LengthLocal,
BufferLocalInterrupt,
LengthLocal,
FALSE,
&event,
&ioStatus
);

if (irp == NULL) {

return STATUS_INSUFFICIENT_RESOURCES;
}

irpNextStack = IoGetNextIrpStackLocation(irp);

status = IoCallDriver(
SmartcardExtension->ReaderExtension->SlotConnected,
irp
);

if (status == STATUS_PENDING) {

KeWaitForSingleObject(
&event,
Executive,
KernelMode,
FALSE,
NULL
);

status = ioStatus.Status;

SmartcardExtension->ReaderExtension->ReplyBufferLength = 0;
}

if (SmartcardExtension->ReaderExtension->SlotIoControlCode ==
SMARTCARD_WRITE)
{
status = STATUS_MORE_PROCESSING_REQUIRED;
}

} while (status == STATUS_MORE_PROCESSING_REQUIRED);

return status;
}

And if I understand you, I must just add a completionRoutine before keWaitforSingleObject ?

like that :

NTSTATUS
ccid_SendDeviceInterrupt2(PDEVICE_OBJECT deviceObject)
{
NTSTATUS status;
IO_STATUS_BLOCK ioStatus;
KEVENT event;
PIRP irp;

do {

// Build irp to be sent to serial driver
irp = IoBuildDeviceIoControlRequest()

IoSetCompletionRoutine(irp, (PIO_COMPLETION_ROUTINE) ccid_OnInterrupt, deviceExtension, TRUE, TRUE, TRUE);

irpNextStack = IoGetNextIrpStackLocation(irp);

status = IoCallDriver(
SmartcardExtension->ReaderExtension->SlotConnected,
irp
);

if (status == STATUS_PENDING) {

KeWaitForSingleObject(
&event,
Executive,
KernelMode,
FALSE,
NULL
);
status = ioStatus.Status;
SmartcardExtension->ReaderExtension->ReplyBufferLength = 0;
}
} while (status == STATUS_MORE_PROCESSING_REQUIRED);
return status;
}

If it’s ok how proceed for continue to use my slot normaly and send other IRP even if this IRP is not completed.

Thank you

Best regards,
Kamel