Input: uinput - add new UINPUT_DEV_SETUP and UI_ABS_SETUP ioctl

This adds two new ioctls, UINPUT_DEV_SETUP and UI_ABS_SETUP, that replaces
the old device setup method (by write()'ing "struct uinput_user_dev" to the
node). The old method is not easily extendable and requires huge payloads.
Furthermore, overloading write() without properly versioned objects is
error-prone.

Therefore, we introduce two new ioctls to replace the old method.  These
ioctls support all features of the old method, plus a "resolution" field
for absinfo. Furthermore, it's properly forward-compatible to new ABS codes
and a growing "struct input_absinfo" structure.

UI_ABS_SETUP also allows user-space to skip unknown axes if not set.  There
is no need to copy the whole array temporarily into the kernel, but instead
the caller issues several ioctl where we copy each value manually.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/uinput.h b/include/linux/uinput.h
index 0994c0d01a09..75de43da2301 100644
--- a/include/linux/uinput.h
+++ b/include/linux/uinput.h
@@ -20,6 +20,11 @@
  * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
  *
  * Changes/Revisions:
+ *      0.5     08/13/2015 (David Herrmann <dh.herrmann@gmail.com> &
+ *                          Benjamin Tissoires <benjamin.tissoires@redhat.com>)
+ *              - add UI_DEV_SETUP ioctl
+ *              - add UI_ABS_SETUP ioctl
+ *              - add UI_GET_VERSION ioctl
  *      0.4     01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
  *              - add UI_GET_SYSNAME ioctl
  *      0.3     24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>)