How does KMDF driver control the master volume of Windows?

Dear Sirs:
I am developing a KMDF codec driver.
One of features is that the user can press buttons which are attached on a headset to manipulate the render volume.
Is there any windows API available to allow me to control the master volume of Windows under KMDF developmnet?
Thanks a lot.
Sincerely,
Zale Yu

Hi Doron,
Thank you for pointing out the direction. Here please allow me to ask two questions, and also please review a possible solution.
Question:
- may I ask for more details on how to do this underlying bus driver? i.e. could you kindly list a few steps on how to do this?
- Any related samples available in MSDN WDF I can look at to get th idea/even reuse the code?
Possibl solution:
- how about claiming the codec device as a HID devic as well, and make a minidriver to pass through IRPs to filter driver which captures/interprets the button-press interrupt and then send HID report to change system volume? is this feasible?
any conflict: Can Kernal add th driver (now Codec function Driver, Mini driver and a HID filter driver all together) stack together -- so the right driver can process the packet interested?
Thanks again.
JerryWang.xw

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How does KMDF driver control the master volume of Windows?

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