snd_hdsp(4): Add sysctls to select analog signal levels.

RME HDSP 9632 sound cards support different sensitivity levels at the
analog input, and different gain levels for the analog line and phones

snd_hdsp(4): Add sysctls to select analog signal levels.

RME HDSP 9632 sound cards support different sensitivity levels at the
analog input, and different gain levels for the analog line and phones
outputs. Expose these settings as sysctl tunables.

Tested on hardware:
- Phones output volume changes according to sysctl setting (caution,
still extremely loud).
- Create loop to feedback the line output to line input.
- Iterate through input signal levels and observe volume changes in
recorded audio.
- Iterate through output signal levels and observe volume changes in
recorded audio.

Reviewed by: br, christos
Differential Revision: https://reviews.freebsd.org/D47330

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snd_hdsp(4): Support AO4S-192 and AI4S-192 extension boards.

Create an additional 4 channel pcm device for RME HDSP 9632 sound cards,
to support the optional AO4S-192 and AI4S-192 extension boards.

snd_hdsp(4): Support AO4S-192 and AI4S-192 extension boards.

Create an additional 4 channel pcm device for RME HDSP 9632 sound cards,
to support the optional AO4S-192 and AI4S-192 extension boards. For
simplicity, the <HDSP 9632 [ext]> pcm device is always present, even if
the extension boards are not installed.

Unfortunately I cannot test this with actual hardware, but I made sure
the additional channels do not affect the functionality of the HDSP 9632
as currently in src.

Reviewed by: christos, br
Differential Revision: https://reviews.freebsd.org/D46837

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snd_hdsp(4): RME HDSP 9632 and HDSP 9652 sound card driver.

Add a sound(4) bridge device driver for the RME HDSP 9632 and HDSP 9652
sound cards. These cards require a nowadays rare PCI 32bit (not PC

snd_hdsp(4): RME HDSP 9632 and HDSP 9652 sound card driver.

Add a sound(4) bridge device driver for the RME HDSP 9632 and HDSP 9652
sound cards. These cards require a nowadays rare PCI 32bit (not PCIe)
slot, but still see use due to their value and wealth of features.
The HDSP 9632 is mostly comparable to the newer HDSPe AIO, while the
HDSP 9652 is similar to the HDSPe RayDAT. These HDSPe PCIe cards are
supported by the snd_hdspe(4) driver which was taken as a starting point
for development of snd_hdsp(4).

Implementation is kept separately due to substantial differences in
hardware configuration and to allow easy removal in case PCI 32bit
support would be phased out in the future.

The snd_hdsp(4) kernel module is not enabled by default, and can be
loaded at runtime with kldload(8) or during boot via loader.conf(5).
Basic operation was tested with both cards, not including all optional
cable connectors and expansion boards. Features should be roughly on par
with the snd_hdspe(4) supported cards.

Reviewed by: christos, br
Differential Revision: https://reviews.freebsd.org/D45112

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