linux-kernel - patch for using joysticks in 32 bit applications on 64 bit systems

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Message-ID: <476D15EC.8010309@tyrell.hu>
Date:	Sat, 22 Dec 2007 14:49:32 +0100
From:	Ákos Maróy <darkeye@...ell.hu>
To:	linux-kernel@...r.kernel.org
Subject: patch for using joysticks in 32 bit applications on 64 bit systems

unfortunately 32 bit apps don't see the joysticks on a 64 bit system.
this prevents one playing X-Plane (http://www.x-plane.com/) or other
32-bit games with joysticks.

this is a known issue, and already raised several times:

http://readlist.com/lists/vger.kernel.org/linux-kernel/28/144411.html

http://www.brettcsmith.org/wiki/wiki.cgi?action=browse&diff=1&id=OzyComputer/Joystick

unfortunately this is still not fixed in the mainline kernel.

it would be nice to have this fixed, so that people can play these games
without having to patch their kernel.

the following patch solves the problem on 2.6.22:


diff -Naur linux-2.6.22-suspend2-r2/fs/compat_ioctl.c
linux-2.6.22-suspend2-r2-joystick/fs/compat_ioctl.c
--- linux-2.6.22-suspend2-r2/fs/compat_ioctl.c  2007-12-22
14:08:14.000000000
+0100
+++ linux-2.6.22-suspend2-r2-joystick/fs/compat_ioctl.c 2007-12-22
14:07:54.000000000 +0100
@@ -10,6 +10,8 @@
  * ioctls.
  */

+#include <linux/joystick.h>
+
 #include <linux/types.h>
 #include <linux/compat.h>
 #include <linux/kernel.h>
@@ -3259,6 +3261,12 @@
 COMPATIBLE_IOCTL(VIDEO_GET_SIZE)
 COMPATIBLE_IOCTL(VIDEO_GET_FRAME_RATE)

+/* joystick */
+COMPATIBLE_IOCTL(JSIOCGVERSION)
+COMPATIBLE_IOCTL(JSIOCGAXES)
+COMPATIBLE_IOCTL(JSIOCGBUTTONS)
+COMPATIBLE_IOCTL(JSIOCGNAME(0x200)) /* for X-Plane 8.03 */
+
 /* now things that need handlers */
 HANDLE_IOCTL(MEMREADOOB32, mtd_rw_oob)
 HANDLE_IOCTL(MEMWRITEOOB32, mtd_rw_oob)

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