More like drivers should be open source to begin with.

This would be fantastic. I'm trying to write an audio driver for my HT|Omega eClaro PCIe soundcard for Linux by leveraging kernel modules for cards with a similar BOM. It is mostly working, but the main hurdle is the inability to increase the volume to >= 50% of the volume in Windows. I'm setting attenuation correctly to the correct DAC registers and I can hear the opamp relay click on, but can't adjust the final gain. It sure would be great to have the Windows driver source. Worse yet, the company is unresponsive to my requests for any info (schematics, gain setting sequence, anything).