AFAICT looking at snd_loop.c source code lines 570-571 ( see
http://lxr.free-electrons.com/source/sound/drivers/aloop.c) the loopback
driver does not support 24bit format.
Code:
--------------------
570 .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
571 SNDRV_PCM_FMTBIT_S32_LE |
SNDRV_PCM_FMTBIT_S32_BE |
572 SNDRV_PCM_FMTBIT_FLOAT_LE |
SNDRV_PCM_FMTBIT_FLOAT_BE),
--------------------
You can built and try the hw_params program to get supported formats of
your alsa devices - see
http://mailman.alsa-project.org/pipermail/alsa-devel/attachments/20110306/376b9e73/attachment.c
The loopback driver is intended for use with no audio hardware as per
the original post where you got the solution. Since you want to record
the Wolfson audio linein I cannot see how the loopback driver is going
to solve your problem - there must a simple more direct solution.
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