Bluetooth: 6LoWPAN: Create a kernel module

Instead of adding the 6LoWPAN functionality to Bluetooth module,
we create a separate kernel module for it.

Usage:

In the slave side do this:

$ modprobe bluetooth_6lowpan
$ echo 62 > /sys/kernel/debug/bluetooth/6lowpan_psm
$ hciconfig hci0 leadv

In the master side do this:

$ modprobe bluetooth_6lowpan
$ echo 62 > /sys/kernel/debug/bluetooth/6lowpan_psm
$ echo 'connect E0:06:E6:B7:2A:73 1' > \
                  /sys/kernel/debug/bluetooth/6lowpan_control

The 6LoWPAN functionality can be controlled by psm value. If it
is left to 0, then the module is disabled and all the 6LoWPAN
connections are dropped if there were any. In the above example,
the psm value is just an example and not a real value for
6LoWPAN service. The real psm value is yet to be defined in
Bluetooth specification.

The 6lowpan controlling interface is a temporary solution
until the specifications are ready.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

3 files changed, 17 insertions, 6 deletions

diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index bdb01eb3bfcc..ceffe20fcbaa 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -14,6 +14,7 @@
 #include <linux/if_arp.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
+#include <linux/module.h>
 #include <linux/debugfs.h>
 
 #include <net/ipv6.h>
@@ -1212,7 +1213,7 @@ static struct notifier_block bt_6lowpan_dev_notifier = {
         .notifier_call = device_event,
 };
 
-int bt_6lowpan_init(void)
+static int __init bt_6lowpan_init(void)
 {
         lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644,
                                                  bt_debugfs, NULL,
@@ -1224,7 +1225,7 @@ int bt_6lowpan_init(void)
         return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
 }
 
-void bt_6lowpan_exit(void)
+static void __exit bt_6lowpan_exit(void)
 {
         debugfs_remove(lowpan_psm_debugfs);
         debugfs_remove(lowpan_control_debugfs);
@@ -1236,3 +1237,11 @@ void bt_6lowpan_exit(void)
 
         unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
 }
+
+module_init(bt_6lowpan_init);
+module_exit(bt_6lowpan_exit);
+
+MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
+MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
diff --git a/net/bluetooth/Kconfig b/net/bluetooth/Kconfig
index 06ec14499ca1..f5afaa22f6ec 100644
--- a/net/bluetooth/Kconfig
+++ b/net/bluetooth/Kconfig
@@ -6,7 +6,6 @@ menuconfig BT
         tristate "Bluetooth subsystem support"
         depends on NET && !S390
         depends on RFKILL || !RFKILL
-        select 6LOWPAN_IPHC if BT_6LOWPAN
         select CRC16
         select CRYPTO
         select CRYPTO_BLKCIPHER
@@ -41,10 +40,11 @@ menuconfig BT
           more information, see <http://www.bluez.org/>.
 
 config BT_6LOWPAN
-        bool "Bluetooth 6LoWPAN support"
+        tristate "Bluetooth 6LoWPAN support"
         depends on BT && IPV6
+        select 6LOWPAN_IPHC if BT_6LOWPAN
         help
-          IPv6 compression over Bluetooth.
+          IPv6 compression over Bluetooth Low Energy.
 
 source "net/bluetooth/rfcomm/Kconfig"
 
diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile
index ca51246b1016..886e9aa3ecf1 100644
--- a/net/bluetooth/Makefile
+++ b/net/bluetooth/Makefile
@@ -7,10 +7,12 @@ obj-$(CONFIG_BT_RFCOMM)	+= rfcomm/
 obj-$(CONFIG_BT_BNEP)   += bnep/
 obj-$(CONFIG_BT_CMTP)   += cmtp/
 obj-$(CONFIG_BT_HIDP)   += hidp/
+obj-$(CONFIG_BT_6LOWPAN) += bluetooth_6lowpan.o
+
+bluetooth_6lowpan-y := 6lowpan.o
 
 bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \
         hci_sock.o hci_sysfs.o l2cap_core.o l2cap_sock.o smp.o sco.o lib.o \
         a2mp.o amp.o
-bluetooth-$(CONFIG_BT_6LOWPAN) += 6lowpan.o
 
 subdir-ccflags-y += -D__CHECK_ENDIAN__