[PATCH evdev] Only force REL_X/Y if no ABS_X/Y exists
Chase Douglas
chase.douglas at canonical.com
Wed Jan 25 10:48:27 PST 2012
On 01/25/2012 07:26 AM, Peter Hutterer wrote:
> 5c5b2c8db851df7921cedd888222a6630a007fd8 added forced x/y axes if a device
> has any axes of the same mode. This was too broad a brush, some devices have
> a relative wheel but absolute x/y axes and would now get misdetected as
> purely relative device.
>
> Only force relative axes if a device no rel x/y _and_ no abs x/y.
>
> Reproducible: virtual machine with QEMU USB Tablet will stop working
>
> Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
> ---
> src/evdev.c | 18 ++++++++++--------
> 1 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/src/evdev.c b/src/evdev.c
> index 32fe38b..a6f9a59 100644
> --- a/src/evdev.c
> +++ b/src/evdev.c
> @@ -2125,6 +2125,13 @@ EvdevProbe(InputInfoPtr pInfo)
> }
> }
>
> + for (i = 0; i < ABS_MAX; i++) {
> + if (EvdevBitIsSet(pEvdev->abs_bitmask, i)) {
> + has_abs_axes = TRUE;
> + break;
> + }
> + }
> +
> if (has_rel_axes) {
> if (EvdevBitIsSet(pEvdev->rel_bitmask, REL_WHEEL) ||
> EvdevBitIsSet(pEvdev->rel_bitmask, REL_HWHEEL) ||
> @@ -2146,7 +2153,9 @@ EvdevProbe(InputInfoPtr pInfo)
> if (EvdevBitIsSet(pEvdev->rel_bitmask, REL_X) &&
> EvdevBitIsSet(pEvdev->rel_bitmask, REL_Y)) {
> xf86IDrvMsg(pInfo, X_PROBED, "Found x and y relative axes\n");
> - } else
> + } else if (!has_abs_axes ||
> + !EvdevBitIsSet(pEvdev->abs_bitmask, ABS_X) ||
> + !EvdevBitIsSet(pEvdev->abs_bitmask, ABS_Y))
!has_abs_axes implies !EvdevBitIsSet(pEvdev->abs_bitmask, ABS_X) and
!EvdevBitIsSet(pEvdev->abs_bitmask, ABS_Y). If I'm parsing the logic
right, we don't need the check for !has_abs_axes. There is no case in
which !has_abs_axes can be true but the ABS_X and ABS_Y are not present.
-- Chase
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