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 <[e-mail]>

drivers/macintosh/Kconfig

···
 	  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
···
 	  /proc/sys/dev/mac_hid/mouse_button3_keycode
 
 	  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"

drivers/macintosh/mac_hid.c

···
 #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 */
···
 
 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);
···
 
 	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);