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September 2006 - Posts

Two more Channel 9 links

This interview is a bit old, but NarG talks about the I/O manager and the driver model. If you ever wanted some inside depth on how the I/O manager works, this one is for you. NarG is the lead for all of WDF (UMDF, KMDF, SDV, PFD) and he certainly knows Read More...
Posted Thursday, September 28, 2006 2:52 PM by doronh | 0 Comments
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On vacation retroactively

Sorry for the lack of posts. I was on vacation from last Thursday until yesterday and didn't have access to the blog (the horror of it all!). Joby, nice to see you at both ends of the trip, thanks for the help with the bags when leaving Seattle! Read More...
Posted Thursday, September 28, 2006 12:11 PM by doronh | 0 Comments

There are class filter drivers and then there are device filter drivers

As I wrote about last time, you can have a class filter driver. What I didn't mention is that there are also device filter drivers. What's the difference between the two? The difference is scope A class filter driver will attach to all device instances Read More...
Posted Monday, September 18, 2006 4:25 PM by doronh | 1 Comments
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Peter Wieland is now on Channel 9

Peter is the dev lead for UMDF. He has a great interview on channel 9. Check it out! Read More...
Posted Monday, September 18, 2006 3:03 PM by doronh | 0 Comments
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There are class drivers and then there are class filter drivers

This came up recently on the newsgroups. The term "class driver" can mean a couple of different things, depending on the context. First, there are class filter drivers. These drivers are loaded based on the device's installed device class . This is the Read More...
Posted Friday, September 15, 2006 7:26 PM by doronh | 1 Comments
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WDM to KMDF porting guide now available on WHDC

We have been working on this one for the last couple of weeks. There is now a WDM to KMDF porting guide on WHDC. There are 2 documents in the download. The first is a very in depth document which goes into great detail about each function, IRP major code, Read More...
Posted Tuesday, September 12, 2006 12:14 PM by doronh | 5 Comments
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How PS2 and HID keyboads report power button events

At first glance, one would think that the reporting of a keypress on a power related (sleep, off, wake) button on your keyboard would be simple. I would have guessed that it worked something like this The key is pressed The key press is reported to the Read More...
Posted Friday, September 08, 2006 3:39 PM by doronh | 2 Comments
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How are power buttons reported in Windows?

There are a few different possible types of power related buttons on a PC. There is the button on the case itself. If you have a laptop, there is a lid switch to detect state change in the lid. There are also power keys on a keyboard. All of these buttons Read More...
Posted Friday, September 08, 2006 1:58 PM by doronh | 5 Comments
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