Staging: panel: remove support for smartcards

Smartcard support was more like a proof-of-concept than a completed
work. It was only able to read serial numbers from a few smartcards,
and the goal was to be able to secure keypad access with a smartcard.
Given how the concept was limited, this was never used beyond demos,
and it's better to remove this code so that nobody tries to use it
for security purposes.

The function panel_bind_callback() was ifdef'ed out, as its only user
was smartcard. However, it would be a waste to remove it because many
variations made on this driver will need it.
Signed-off-by: Willy Tarreau <w@1wt.eu>
Cc: Frank Menne <frank.menne@hsm.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/panel/Kconfig

@@ -3,13 +3,12 @@ config PANEL
 	depends on PARPORT
 	---help---
 	  Say Y here if you have an HD44780 or KS-0074 LCD connected to your
-	  parallel port. This driver also features 4 and 6-key keypads, and a
-	  'smartcard' reader. The LCD is accessible through the /dev/lcd char
-	  device (10, 156), the keypad through /dev/keypad (10, 185), and the
-	  smartcard through /dev/smartcard (10, 186). Both require misc device
-	  to be enabled. This code can either be compiled as a module, or linked
-	  into the kernel and started at boot. If you don't understand what all
-	  this is about, say N.
+	  parallel port. This driver also features 4 and 6-key keypads. The LCD
+	  is accessible through the /dev/lcd char device (10, 156), and the
+	  keypad through /dev/keypad (10, 185). Both require misc device to be
+	  enabled. This code can either be compiled as a module, or linked into
+	  the kernel and started at boot. If you don't understand what all this
+	  is about, say N.
 
 config PANEL_PARPORT
 	int "Default parallel port number (0=LPT1)"
@@ -45,17 +44,6 @@ config PANEL_PROFILE
 	  wired to the parallel port, and how it works. This is only intended
 	  for experts.
 
-config PANEL_SMARTCARD
-	depends on PANEL && PANEL_PROFILE="0"
-	bool "Enable smartcard reader (read help!)"
-	default "n"
-	---help---
-	  This enables the 'smartcard' reader as installed on the server at
-	  'www.ant-computing.com'. It was not really a smartcard reader, just
-	  a telephone-card reader. It is left here for demonstration and
-	  experimentation. If you enable this driver, it will be accessible
-	  through character device 10,186.
-
 config PANEL_KEYPAD
 	depends on PANEL && PANEL_PROFILE="0"
 	int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"