[SCSI] add scsi changer driver

This patch adds a device driver for scsi media changer devices.

Signed-off-by: Gerd Knorr <kraxel@bytesex.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/Kconfig

@@ -137,6 +137,24 @@ config CHR_DEV_SG
 
 	  If unsure, say N.
 
+config CHR_DEV_SCH
+	tristate "SCSI media changer support"
+	depends on SCSI
+	---help---
+	  This is a driver for SCSI media changers.  Most common devices are
+	  tape libraries and MOD/CDROM jukeboxes.  *Real* jukeboxes, you
+	  don't need this for those tiny 6-slot cdrom changers.  Media
+	  changers are listed as "Type: Medium Changer" in /proc/scsi/scsi.
+	  If you have such hardware and want to use it with linux, say Y
+	  here.  Check <file:Documentation/scsi-changer.txt> for details.
+	
+	  If you want to compile this as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt> and
+	  <file:Documentation/scsi.txt>. The module will be called ch.o.
+	  If unsure, say N.
+	
+
 comment "Some SCSI devices (e.g. CD jukebox) support multiple LUNs"
 	depends on SCSI