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authorJason Gerecke <killertofu@gmail.com>2016-10-19 18:03:54 -0700
committerJiri Kosina <jkosina@suse.cz>2016-10-20 09:54:01 +0200
commitc0bf57411b6b03dd72d4d20f362ba1ca72244834 (patch)
tree8485bbfb2329b23b6bbb3a018541580990ec3cf7 /drivers/hid/hid-input.c
parentbf78adcb6dc681624015a4390f0e5f656cb0270b (diff)
HID: input: Recognize ABS_WHEEL in hidinput_calc_abs_res
The "Steering" usage (HID_UP_SIMULATION | 0xc8) is defined in HUT 1.12 as follows: "A steering wheel is a single degree-of-freedom device that rotates about an axis. The zero position is always the neutral or 'straight ahead' position, with positive values turning clockwise and negative values turning counterclockwise. If the Coordinate Values Wrap attribute is set, the steering wheel can be turned past 360 degrees." The hidinput_configure_usage function canonically maps this usage to the ABS_WHEEL axis, but hidinput_calc_abs_res does not recognize this axis as one for which it can calculate a resolution. This effectively prevents wheels from being assigned a proper resolution that userspace can use to determine the precise angle of input. This commit adds ABS_WHEEL as a rotational axis to hidinput_calc_abs_res. Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-input.c')
-rw-r--r--drivers/hid/hid-input.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index fb9ace1cef8b..c4e935b5fe74 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -253,6 +253,7 @@ __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
case ABS_RX:
case ABS_RY:
case ABS_RZ:
+ case ABS_WHEEL:
case ABS_TILT_X:
case ABS_TILT_Y:
if (field->unit == 0x14) { /* If degrees */