gigaset: allow building without I4L

Add a dummy LL interface to the Gigaset driver so that it can be
built and, in a limited way, used without the ISDN4Linux subsystem.

Impact: new configuration alternative
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/isdn/gigaset/Kconfig b/drivers/isdn/gigaset/Kconfig
index 18ab8652aa57..6fd2dc1e97fb 100644
--- a/drivers/isdn/gigaset/Kconfig
+++ b/drivers/isdn/gigaset/Kconfig
@@ -1,6 +1,5 @@
 menuconfig ISDN_DRV_GIGASET
         tristate "Siemens Gigaset support"
-        depends on ISDN_I4L
         select CRC_CCITT
         select BITREVERSE
         help
@@ -11,9 +10,21 @@ menuconfig ISDN_DRV_GIGASET
           If you have one of these devices, say M here and for at least
           one of the connection specific parts that follow.
           This will build a module called "gigaset".
+          Note: If you build the ISDN4Linux subsystem (ISDN_I4L)
+          as a module, you have to build this driver as a module too,
+          otherwise the Gigaset device won't show up as an ISDN device.
 
 if ISDN_DRV_GIGASET
 
+config GIGASET_I4L
+        bool
+        depends on ISDN_I4L='y'||(ISDN_I4L='m'&&ISDN_DRV_GIGASET='m')
+        default y
+
+config GIGASET_DUMMYLL
+        bool
+        default !GIGASET_I4L
+
 config GIGASET_BASE
         tristate "Gigaset base station support"
         depends on USB