We must not reassign those axes or we will break backwards-compat. Add a
small note for that so we don't accidentally some day reuse these.
Signed-off-by: David Herrmann <dh.herrm...@gmail.com>
---
include/uapi/linux/input.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h
index a372627..da1125e 100644
--- a/include/uapi/linux/input.h
+++ b/include/uapi/linux/input.h
@@ -816,6 +816,10 @@ struct input_keymap_entry {
#define ABS_MISC 0x28
+/* ABS_MISC+x is used by HID to assign to unknown axes. Note that they used to
+ * flow over into the MT definitions. For backwards-compatibility, we must
+ * not reassign [0x29-0x2e] */
+
#define ABS_MT_SLOT 0x2f /* MT slot being modified */
#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */
--
1.8.5.1
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