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hwdb: add MOUSE_WHEEL_CLICK_ANGLE as property 

Most mice have a wheel click angle of 15 degrees, i.e. 24 clicks per full
wheel rotation. Some mice, like the Logitech M325 have a larger angle. To
allow userspace to make use of that knowledge, add a property to the hwdb.

This allows for better predictive scrolling. e.g. a mouse that has a smaller
click angle will scroll faster, with this value you can accommodate this
where needed. Likewise, using "half turn of the wheel" or "full turn of the
wheel" as a UI element becomes possible.

This addition is mainly driven by libinput 0.8, having the angle enables
libinput to provide an API that distinguishes between a physical distance
(like touchpad scrolling does) and discrete steps (wheel clicks).
Callers can choose what they prefer based on the device.
This commit is contained in:
Peter Hutterer 2015-01-09 09:51:40 +10:00
parent 6dcfca59fc
commit 011c703495
1 changed files with 31 additions and 13 deletions
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44
hwdb/70-mouse.hwdb
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@ -28,6 +28,29 @@
# mouse:usb:v17efp6019:*
# mouse:*:name:Lenovo Optical USB Mouse:
#
# To add local entries, create a new file
# /etc/udev/hwdb.d/71-mouse-local.hwdb
# and add your rules there. To load the new rules execute (as root):
# udevadm hwdb --update
# udevadm trigger /dev/input/eventXX
# where /dev/input/eventXX is the mouse in question. If in
# doubt, simply use /dev/input/event* to reload all input rules.
#
# If your changes are generally applicable, open a bug report on
# http://bugs.freedesktop.org/enter_bug.cgi?product=systemd
# and include your new rules, a description of the device, and the
# output of
# udevadm info /dev/input/eventXX
# (or /dev/input/event*).
#
# Allowed properties are:
# MOUSE_DPI
# MOUSE_WHEEL_CLICK_ANGLE
#
#########################################
# MOUSE_DPI #
#########################################
#
# DPI settings are specified as
# MOUSE_DPI=<dpi>[@<frequency>]
#
@ -64,20 +87,15 @@
# third-party software) must not be entered into this file, use a local
# hwdb instead.
#
# To add local entries, create a new file
# /etc/udev/hwdb.d/71-mouse-local.hwdb
# and add your rules there. To load the new rules execute (as root):
# udevadm hwdb --update
# udevadm trigger /dev/input/eventXX
# where /dev/input/eventXX is the mouse in question. If in
# doubt, simply use /dev/input/event* to reload all input rules.
#########################################
# MOUSE_WHEEL_CLICK_ANGLE #
#########################################
#
# The angle in degrees per mouse wheel 'click', specified as
# MOUSE_WHEEL_CLICK_ANGLE=<degrees>
#
# Most mice have a 15 degree click stop (24 clicks per full rotation).
#
# If your changes are generally applicable, open a bug report on
# http://bugs.freedesktop.org/enter_bug.cgi?product=systemd
# and include your new rules, a description of the device, and the
# output of
# udevadm info /dev/input/eventXX
# (or /dev/input/event*).
#
# Sort by by brand, type (usb, bluetooth), DPI, frequency.