Input: uinput - allow for 0/0 min/max on absolute axes.
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 <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index 364bdf4..7360568 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -302,10 +302,14 @@
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,
