USB generic driver
Adds mixer controls for the CMSS/Dolby Digital/Power LEDs
on the SB Audigy 2 NX.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

USB generic driver
Add ioctls to the Sound Blaster remote control hwdep device so that it
can be used with LIRC.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

USB generic driver
Extension units can have type 0, so do not ignore them when constructing
mixer controls.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

USB generic driver
Cache the decoded values of idVendor/idProduct to get rid of most of
those ugly le16_to_cpu() calls.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

ALSA Core,USB generic driver
Add an hwdep interface that supports reading remote control data from
Sound Blaster Extigy and Audigy 2 NX devices.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

USB generic driver
Add support for the optional status interrupt endpoint in audio control
interfaces, and translate USB status notifications into ALSA mixer
control notifications.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

USB generic driver
Move all data related to audio control interfaces into a separate struct
local to usbmixer.c.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

USB generic driver
Unit/terminal IDs are 8-bit integers, so the unitbitmap
variable does not need to be bigger than 256 bits.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

USB generic driver
Add a mechanism to specify source names of selector units,
and add such names for the SB Audigy 2 NX.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!