[ALSA] usb-audio - add a proc file for Audigy 2 NX jack status

USB generic driver
This patch adds a proc file for the SB Audigy 2 NX which shows the
connection status of the various jacks.  Unfortunately, no SPDIF input
frequency (yet).

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
1 file changed