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authorMichal Malý <madcatxster@gmail.com>2012-09-23 22:41:08 +0200
committerJiri Kosina <jkosina@suse.cz>2012-09-25 15:41:02 +0200
commit2b24a960016b8d3221a6dd2764ab97247c48dd97 (patch)
treecf01b767eee96bd9d178a43d8c694cafeb287b3c /drivers/hid/hid-lg.c
parent74479ba861b5cd77d445c2ec8f59521ae509f7db (diff)
HID: hid-lg4ff: Adjust X axis input value accordingly to selected range.
Range limiting command for the Driving Force Pro wheel is only a FF_SPRING effect so that the wheel creates resistance when the user tries to turn it past the limit. It is however possible to overpower the FFB motors quite easily which leads to the X axis value exceeding the expected limit. This confuses games which dynamically adjust calibration using the highest/lowest min and max values reported by the wheel. Joydev device driver also doesn't take in account any changes in an axis range after the joystick device is created. This patch recalculates received ABS_X axis value so it is always in <0; 16383> range where 0 is the left limit and 16383 the right limit. Logitech driver for Windows does the same thing. As for any concerns about possible loss of precision, I compared a large set of raw/adjusted values generated by "mult_frac" to values returned by the Windows driver and I got a 100% match. Other Logitech wheels will probably need a similar fix, but I currently lack the information needed to write one. Signed-off-by: Michal Malý <madcatxster@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-lg.c')
-rw-r--r--drivers/hid/hid-lg.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c
index fc37ed6b108..760b30bc273 100644
--- a/drivers/hid/hid-lg.c
+++ b/drivers/hid/hid-lg.c
@@ -342,6 +342,9 @@ static int lg_event(struct hid_device *hdev, struct hid_field *field,
-value);
return 1;
}
+ if (drv_data->quirks & LG_FF4) {
+ return lg4ff_adjust_input_event(hdev, field, usage, value, drv_data);
+ }
return 0;
}