View source for Enabling force feedback in kernel

Here is how to enable force feedback on Ubuntu 8.10 64 bits kernels (should also work on 32 bits ones):

==For the G25 owners==
If you use a G25 wheel, you need to patch your kernel to be able to use it in its native mode
First create a patch file named G25.patch for the kernel ( patches for 2.6.27 and 2.6.28 are provided ).

=== kernel 2.6.27 ===
 diff -Naur linux-source-2.6.27/drivers/hid/usbhid/hid-ff.c linux-source-2.6.27.orig/drivers/hid/usbhid/hid-ff.c
 --- linux-source-2.6.27/drivers/hid/usbhid/hid-ff.c    2008-10-10 00:13:53.000000000 +0200                     
 +++ linux-source-2.6.27.orig/drivers/hid/usbhid/hid-ff.c       2009-02-23 22:21:27.000000000 +0100             
 @@ -57,6 +57,7 @@                                                                                              
        { 0x46d, 0xc286, hid_lgff_init }, /* Logitech Force 3D Pro Joystick */                                  
        { 0x46d, 0xc294, hid_lgff_init }, /* Logitech Formula Force EX */                                       
        { 0x46d, 0xc295, hid_lgff_init }, /* Logitech MOMO force wheel */
 +      { 0x46d, 0xc299, hid_lgff_init }, /* Logitech G25 wheel */
        { 0x46d, 0xca03, hid_lgff_init }, /* Logitech MOMO force wheel */
  #endif
  #ifdef CONFIG_LOGIRUMBLEPAD2_FF
 diff -Naur linux-source-2.6.27/drivers/hid/usbhid/hid-lgff.c linux-source-2.6.27.orig/drivers/hid/usbhid/hid-lgff.c
 --- linux-source-2.6.27/drivers/hid/usbhid/hid-lgff.c  2008-10-10 00:13:53.000000000 +0200
 +++ linux-source-2.6.27.orig/drivers/hid/usbhid/hid-lgff.c     2009-02-23 22:23:22.000000000 +0100
 @@ -55,6 +55,7 @@
        { 0x046d, 0xc286, ff_joystick },
        { 0x046d, 0xc294, ff_joystick },
        { 0x046d, 0xc295, ff_joystick },
 +      { 0x046d, 0xc299, ff_joystick },
        { 0x046d, 0xca03, ff_joystick },
  };
 diff -Naur linux-source-2.6.27/drivers/hid/usbhid/hid-quirks.c linux-source-2.6.27.orig/drivers/hid/usbhid/hid-quirks.c
 --- linux-source-2.6.27/drivers/hid/usbhid/hid-quirks.c        2009-03-13 18:54:14.000000000 +0100
 +++ linux-source-2.6.27.orig/drivers/hid/usbhid/hid-quirks.c   2009-02-23 22:25:45.000000000 +0100
 @@ -316,6 +316,7 @@
  #define USB_DEVICE_ID_LOGITECH_HARMONY_64 0xc14f
  #define USB_DEVICE_ID_LOGITECH_EXTREME_3D     0xc215
  #define USB_DEVICE_ID_LOGITECH_WHEEL  0xc294
 +#define USB_DEVICE_ID_LOGITECH_WHEELG25       0xc299
  #define USB_DEVICE_ID_LOGITECH_ELITE_KBD      0xc30a
  #define USB_DEVICE_ID_LOGITECH_KBD    0xc311
  #define USB_DEVICE_ID_S510_RECEIVER   0xc50c
 @@ -625,6 +626,7 @@
        { USB_VENDOR_ID_ELO, USB_DEVICE_ID_ELO_TS2700, HID_QUIRK_NOGET },
        { USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_EXTREME_3D, HID_QUIRK_NOGET },
        { USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_WHEEL, HID_QUIRK_NOGET },
 +      { USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_WHEELG25, HID_QUIRK_NOGET },
        { USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_WIRELESS_OPTICAL_DESKTOP_3_0, HID_QUIRK_NOGET },
        { USB_VENDOR_ID_PETALYNX, USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE, HID_QUIRK_NOGET },
        { USB_VENDOR_ID_SUN, USB_DEVICE_ID_RARITAN_KVM_DONGLE, HID_QUIRK_NOGET },

=== kernel 2.6.28 ===
 diff -Naur linux-source-2.6.28/drivers/hid/hid-core.c linux-source-2.6.28.patched/drivers/hid/hid-core.c
 --- linux-source-2.6.28/drivers/hid/hid-core.c  2009-04-08 06:38:33.000000000 +0200
 +++ linux-source-2.6.28.patched/drivers/hid/hid-core.c  2009-04-10 14:15:27.000000000 +0200
 @@ -1290,6 +1290,7 @@
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_FORCE3D_PRO) },
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOMO_WHEEL) },
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2) },
 +       { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G25_WHEEL) },
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RUMBLEPAD2) },
         { HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_SIDEWINDER_GV) },
         { HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_NE4K) },
 diff -Naur linux-source-2.6.28/drivers/hid/hid-ids.h linux-source-2.6.28.patched/drivers/hid/hid-ids.h
 --- linux-source-2.6.28/drivers/hid/hid-ids.h   2008-12-25 00:26:37.000000000 +0100
 +++ linux-source-2.6.28.patched/drivers/hid/hid-ids.h   2009-04-10 14:12:44.000000000 +0200
 @@ -291,6 +291,7 @@
  #define USB_DEVICE_ID_LOGITECH_FORCE3D_PRO     0xc286
  #define USB_DEVICE_ID_LOGITECH_WHEEL   0xc294
  #define USB_DEVICE_ID_LOGITECH_MOMO_WHEEL      0xc295
 +#define USB_DEVICE_ID_LOGITECH_G25_WHEEL       0xc299
  #define USB_DEVICE_ID_LOGITECH_ELITE_KBD       0xc30a
  #define USB_DEVICE_ID_LOGITECH_KBD     0xc311
  #define USB_DEVICE_ID_S510_RECEIVER    0xc50c
 diff -Naur linux-source-2.6.28/drivers/hid/hid-lg.c linux-source-2.6.28.patched/drivers/hid/hid-lg.c
 --- linux-source-2.6.28/drivers/hid/hid-lg.c    2008-12-25 00:26:37.000000000 +0100
 +++ linux-source-2.6.28.patched/drivers/hid/hid-lg.c    2009-04-10 14:14:17.000000000 +0200
 @@ -304,6 +304,8 @@
                 .driver_data = LG_FF },
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2),
                 .driver_data = LG_FF },
 +       { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G25_WHEEL),
 +               .driver_data = LG_FF },
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RUMBLEPAD2),
                 .driver_data = LG_FF2 },
         { }

==Enabling force feedback in the kernel==
===Prepare to compile a kernel===
Make sure U have everything needed to compile your kernel :
 sudo apt-get install fakeroot build-essential makedumpfile libncurses5 libncurses5-dev kernel-package
 sudo apt-get build-dep linux
Get the kernel source code :
 sudo apt-get install linux-source
Now we are ready to start :
Prepare your environment:
 mkdir ~/src
 cd ~/src
 tar xjvf /usr/src/linux-source-<version>.tar.bz2
 cd linux-source-<version>

===Apply the G25 patch if needed===
copy the G25.patch file into the source directory ( ~/src ) and
 patch -p1 <../G25.patch
the output should be something like that:
 patching file drivers/hid/usbhid/hid-ff.c
 patching file drivers/hid/usbhid/hid-lgff.c
 patching file drivers/hid/usbhid/hid-quirks.c

===Configure the new kernel===
Get the running kernel configuration:
 cp -vi /boot/config-`uname -r` .config
Adjust the kernel configuration:
 make oldconfig
 make menuconfig
Go to Device Drivers  , and HID Devices 
and enable the following options
 Force feedback support (EXPERIMENTAL)
   PID device support
   Logitech devices support
   Logitech Rumblepad 2 support
   PantherLord/GreenAsia based device support
   ThrustMaster devices support
   Zeroplus based game controller support
With the 2.6.27 kernel on Ubuntu 8.10, I have to disable paravirtualized guest support otherwise the kernel cleaning fail.
This is not needed on 2.6.28 on Ubuntu 9.04 beta (2.6.28.11)
Go to Processor type and features and disable the following:
 Paravirtualized guest support

===Compile and package the new kernel===
 make-kpkg clean
 fakeroot make-kpkg --initrd --append-to-version=-ff kernel-image kernel-headers
you now have 2 new package files in ~/src.

===Install the new kernel===
 sudo dpkg -i linux-image-2.6.27.18-ff_2.6.27.18-ff-10.00.Custom_amd64.deb linux-headers-2.6.27.18-ff_2.6.27.18-ff-10.00.Custom_amd64.deb

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