diff options
Diffstat (limited to 'libevdev/libevdev.h')
| -rw-r--r-- | libevdev/libevdev.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libevdev/libevdev.h b/libevdev/libevdev.h index 2b6f48a..44aa3a6 100644 --- a/libevdev/libevdev.h +++ b/libevdev/libevdev.h @@ -361,6 +361,15 @@ extern "C" { * * As with @ref bits, the logical state of the device as seen by the library * depends on the caller using libevdev_next_event(). + * + * The Linux kernel requires all axes on a device to have a semantic + * meaning, matching the axis names in linux/input.h. Some devices merely + * export a number of axes beyond the available axis list. For those + * devices, the multitouch information is invalid. Specfically, if a device + * provides the ABS_MT_SLOT axis AND also the (ABS_MT_SLOT - 1) axis, the + * device is not treated as multitouch device. No slot information is + * available and the ABS_MT axis range for these devices is treated as all + * other EV_ABS axes. */ /** |