From: David Herrmann <dh.herrmann@gmail.com>
To: linux-input@vger.kernel.org
Cc: Jiri Kosina <jkosina@suse.cz>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Benjamin Tissoires <benjamin.tissoires@gmail.com>,
David Herrmann <dh.herrmann@gmail.com>
Subject: [PATCH] Input: add short note about ABS_MISC+<n> axes
Date: Mon, 16 Dec 2013 16:23:06 +0100 [thread overview]
Message-ID: <1387207386-4601-1-git-send-email-dh.herrmann@gmail.com> (raw)
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.herrmann@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
next reply other threads:[~2013-12-16 15:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-16 15:23 David Herrmann [this message]
2014-01-23 14:39 ` [PATCH] Input: add short note about ABS_MISC+<n> axes David Herrmann
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