[ALSA] Enable the analog loopback of the Revolution 5.1

Enable the analog loopback of the Revolution 5.1 card.
This patch adds support for the PT2258 volume controller and modifies
the Revolution 5.1 driver to make use of this facility.  This allows
to control the analog loopback of the card.

Signed-off-by: Jochen Voss <voss@seehuhn.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/i2c/other/Makefile b/sound/i2c/other/Makefile
index 2fe023ef..77a8a7c 100644
--- a/sound/i2c/other/Makefile
+++ b/sound/i2c/other/Makefile
@@ -6,11 +6,11 @@
 snd-ak4114-objs := ak4114.o
 snd-ak4117-objs := ak4117.o
 snd-ak4xxx-adda-objs := ak4xxx-adda.o
+snd-pt2258-objs := pt2258.o
 snd-tea575x-tuner-objs := tea575x-tuner.o
 
 # Module Dependency
 obj-$(CONFIG_SND_PDAUDIOCF) += snd-ak4117.o
 obj-$(CONFIG_SND_ICE1712) += snd-ak4xxx-adda.o
-obj-$(CONFIG_SND_ICE1724) += snd-ak4xxx-adda.o
-obj-$(CONFIG_SND_ICE1724) += snd-ak4114.o
+obj-$(CONFIG_SND_ICE1724) += snd-ak4114.o snd-ak4xxx-adda.o snd-pt2258.o
 obj-$(CONFIG_SND_FM801_TEA575X) += snd-tea575x-tuner.o