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Input: uinput - allow for 0/0 min/max on absolute axes.

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Some devices provide absolute axes with min/max of 0/0 (e.g. wacom's
ABS_MISC axis). Current uinput restrictions do not allow duplication of
these devices and require hacks in userspace to work around this.

If the kernel accepts physical devices with a min/max of 0/0, uinput
shouldn't disallow the same range.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Peter Hutterer 2011-03-30 22:25:34 -07:00 committed by Dmitry Torokhov
parent 170531bae6
commit a718d79cc0
1 changed files with 5 additions and 1 deletions
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6
drivers/input/misc/uinput.c
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@ -302,10 +302,14 @@ static int uinput_validate_absbits(struct input_dev *dev)
int retval = 0;
for (cnt = 0; cnt < ABS_CNT; cnt++) {
int min, max;
if (!test_bit(cnt, dev->absbit))
continue;
if (input_abs_get_max(dev, cnt) <= input_abs_get_min(dev, cnt)) {
min = input_abs_get_min(dev, cnt);
max = input_abs_get_max(dev, cnt);
if ((min != 0 || max != 0) && max <= min) {
printk(KERN_DEBUG
"%s: invalid abs[%02x] min:%d max:%d\n",
UINPUT_NAME, cnt,