ALSA: virtuoso: Xonar DSX support

This patch adds support for ASUS - Xonar DSX sound cards. Tested on
openSUSE 12.2 with kernel:
Linux 3.4.6-2.10-desktop Digilent#1 SMP PREEMPT Thu Jul 26 09:36:26 UTC 2012 (641c197) x86_64 x86_64 x86_64 GNU/Linux
Works:
 - play sounds
 - adjust volume on master channel.
 - mute .

Since Xonar DS uses the same chip, everything that works for DS should
work for DSX as well.

Signed-off-by: Sergiu Giurgiu <sgiurgiu11@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: sgiurgiu

sound/pci/oxygen/virtuoso.c

@@ -52,6 +52,7 @@ static DEFINE_PCI_DEVICE_TABLE(xonar_ids) = {
 	{ OXYGEN_PCI_SUBID(0x1043, 0x835d) },
 	{ OXYGEN_PCI_SUBID(0x1043, 0x835e) },
 	{ OXYGEN_PCI_SUBID(0x1043, 0x838e) },
+	{ OXYGEN_PCI_SUBID(0x1043, 0x8522) },
 	{ OXYGEN_PCI_SUBID_BROKEN_EEPROM },
 	{ }
 };

sound/pci/oxygen/xonar_wm87x6.c

@@ -1255,7 +1255,6 @@ static void dump_wm87x6_registers(struct oxygen *chip,
 }
 
 static const struct oxygen_model model_xonar_ds = {
-	.shortname = "Xonar DS",
 	.longname = "Asus Virtuoso 66",
 	.chip = "AV200",
 	.init = xonar_ds_init,
@@ -1327,6 +1326,11 @@ int __devinit get_xonar_wm87x6_model(struct oxygen *chip,
 	switch (id->subdevice) {
 	case 0x838e:
 		chip->model = model_xonar_ds;
+		chip->model.shortname = "Xonar DS";
+		break;
+	case 0x8522:
+		chip->model = model_xonar_ds;
+		chip->model.shortname = "Xonar DSX";
 		break;
 	case 0x835e:
 		chip->model = model_xonar_hdav_slim;