Input: Mac button emulation - allow compiling as a module

Not all systems require Mac-style button emulation, however distributions
enable it by default so it is readily available. Allow compiling it as a
module so it can be loaded only on systems that actually require it.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

2 files changed, 16 insertions, 5 deletions

diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig
index aa3c27e5255d..fd85bde283a0 100644
--- a/drivers/macintosh/Kconfig
+++ b/drivers/macintosh/Kconfig
@@ -171,9 +171,8 @@ config INPUT_ADBHID
           If unsure, say Y.
 
 config MAC_EMUMOUSEBTN
-        bool "Support for mouse button 2+3 emulation"
-        depends on SYSCTL
-        select INPUT
+        tristate "Support for mouse button 2+3 emulation"
+        depends on SYSCTL && INPUT
         help
           This provides generic support for emulating the 2nd and 3rd mouse
           button with keypresses.  If you say Y here, the emulation is still
@@ -185,6 +184,9 @@ config MAC_EMUMOUSEBTN
 
           If you have an Apple machine with a 1-button mouse, say Y here.
 
+          To compile this driver as a module, choose M here: the
+          module will be called mac_hid.
+
 config THERM_WINDTUNNEL
         tristate "Support for thermal management on Windtunnel G4s"
         depends on I2C && I2C_POWERMAC && PPC_PMAC && !PPC_PMAC64
diff --git a/drivers/macintosh/mac_hid.c b/drivers/macintosh/mac_hid.c
index 0b210a90aef5..e943d2a29253 100644
--- a/drivers/macintosh/mac_hid.c
+++ b/drivers/macintosh/mac_hid.c
@@ -14,6 +14,8 @@
 #include <linux/input.h>
 #include <linux/module.h>
 
+MODULE_LICENSE("GPL");
+
 static int mouse_emulate_buttons;
 static int mouse_button2_keycode = KEY_RIGHTCTRL;       /* right control key */
 static int mouse_button3_keycode = KEY_RIGHTALT;        /* right option key */
@@ -252,7 +254,6 @@ static ctl_table mac_hid_root_dir[] = {
 
 static struct ctl_table_header *mac_hid_sysctl_header;
 
-
 static int __init mac_hid_init(void)
 {
         mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
@@ -261,5 +262,13 @@ static int __init mac_hid_init(void)
 
         return 0;
 }
+module_init(mac_hid_init);
 
-device_initcall(mac_hid_init);
+static void __exit mac_hid_exit(void)
+{
+        unregister_sysctl_table(mac_hid_sysctl_header);
+
+        if (mouse_emulate_buttons)
+                mac_hid_stop_emulation();
+}
+module_exit(mac_hid_exit);