Problem with IoGetDeviceProperty

NTDEV
1

Hi all,

I have written a CPI driver on Windows 2000. I have written a function to
read PCI config space from device. And i am trying to use
IoGetDeviceProperty function to get bustype, busnumber, device number .

But i am getting all values zero. I am calling this function from AddDevice
routine of my driver.
Can anybody tell me , what is wrong in this procedure and also is there any
other way to read bus number, bustype and device number ?

Thanks and regards,
Anil

2

>I have written a CPI driver on Windows 2000. I have written a function to read PCI config space from device.

And i am trying to use IoGetDeviceProperty function to get bustype, busnumber, device number .
But i am getting all values zero.

Try calling it from START path up (after completion by the lower driver).

Max

3

Hi all,
Iam working on WDM driver development of PCI device.
I am not bale to read bus no., device no., Legacy bus type using
IoGetDeviceProperty function.
It always gives all parameters as zero. I am not able to understand the
problem .
whether am i doing wrong by calling this function in AddDevice routine?
Kindly guide me on this problem.

Please consider this mail as my sincere request …

Thansk and regards,
Anil

4

What is the NT status returned by the routine? Perhaps the buffer you
are sending is too small?

Anil wrote:

Hi all,Iam working on WDM driver development of PCI device.I am not
bale to read bus no., device no., Legacy bus type using
IoGetDeviceProperty function.It always gives all parameters as zero. I
am not able to understand the problem .whether am i doing wrong by
calling this function in AddDevice routine?Kindly guide me on this
problem.Please consider this mail as my sincere request …Thansk and
regards,Anil—
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5

Well, as the bus driver is not required to power up the device until the IRP_MJ_PNP IRP_MN_START_DEVICE IRP is sent, it is likely that this is an invalid operation to perform in AddDevice. I doubt the bus expects this request when you are sending it. Is there a reason you are not doing this in your start handler?

–
Bill McKenzie
Windows DDK MVP
OSR - Windows System Software Development, Training, and Consulting

“Anil” wrote in message news:xxxxx@ntdev…
Hi all,
Iam working on WDM driver development of PCI device.
I am not bale to read bus no., device no., Legacy bus type using IoGetDeviceProperty function.
It always gives all parameters as zero. I am not able to understand the problem .
whether am i doing wrong by calling this function in AddDevice routine?
Kindly guide me on this problem.

Please consider this mail as my sincere request …

Thansk and regards,
Anil