THE DEVICE:
The Saitek GM2 is a combination mouse and gamepad. The mouse is equipped with
two buttons, a scroll wheel, and a hat switch; the gamepad has seven buttons,
a thumb wheel, and another hat switch. The mouse plugs into the gamepad,
which in turn plugs into a USB port.
THE PROBLEM:
The existing USB driver shipped with the 2.4.0-test2 kernel recognizes the
mouse, although it can't seem to distinguish which way the scroll wheel is
turning; I plan to investigate this matter further. But the gamepad is not
seen at all; nor is the hat switch on the mouse.
It turns out that the gamepad reports itself as a joystick, but the stock
joystick driver refuses to register it because there is no Y axis. This
"joystick" encompasses the thumb wheel (as the X axis), the buttons and hat
switch on the gamepad, and the hat switch on the mouse.
THE PATCH:
To support the Saitek GM2, it is necessary to remove the check for the ABS_Y
bit in joydev_connect (joydev.c, line 388).
Original code:
if (!(test_bit(EV_KEY, dev->evbit) && test_bit(EV_ABS, dev->evbit) &&
test_bit(ABS_X, dev->absbit) && test_bit(ABS_Y, dev->absbit) &&
(test_bit(BTN_TRIGGER, dev->keybit) || test_bit(BTN_A, dev->keybit)
|| test_bit(BTN_1, dev->keybit)))) return NULL;
Patched code:
if (!(test_bit(EV_KEY, dev->evbit) && test_bit(EV_ABS, dev->evbit) &&
test_bit(ABS_X, dev->absbit) &&
(test_bit(BTN_TRIGGER, dev->keybit) || test_bit(BTN_A, dev->keybit)
|| test_bit(BTN_1, dev->keybit)))) return NULL;
Once patched, compiled, and installed, the driver will then recognize the
gamepad as a USB joystick.
--
--------------===============<[ Ray Chason ]>===============--------------
PGP public key at http://www.smart.net/~rchason/pubkey.asc
Delenda est Windoze
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