Full I/O Control of Analog Pins on Realtek ALC889?

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I have an MSI 890FXA-GD70 which uses the Realtek ALC889 chipset.
A look at the datasheet (Figure 1) confirms that the 4 main analog rca
jacks (front,rear,surround,clfe) are all bidirectional based on some
internal muxes.

I would like the ability to change (e.g. rear and surround) into
inputs (defaults to output) and to capture them in userspace, however
alsamixer doesn't appear to understand that they are anything but
inputs.

Although it recognises the 3 configurable PCM inputs, it only allows
the input signal to be routed from 'front-mic, rear-mic, line-in',
despite the datasheet showing that each of these PCM inputs can be
muxed across the full 10 jacks of the chip.

The Windows drivers allow this configuration, with each jack
effectively individually routable to any input or output channel.

Does anyone know if this can be done with the alsa drivers?

Thanks.
Ali

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