From: Ben Gamari <ben@smart-cactus.org>
To: "Pali Rohár" <pali.rohar@gmail.com>, linux-input@vger.kernel.org
Cc: Hans de Goede <hdegoede@redhat.com>,
Allen Hung <Allen_Hung@dell.com>,
Masaki Ota <masaki.ota@jp.alps.com>,
Ben Morgan <Ben_Morgan@dell.com>
Subject: [PATCH v2] Support for Alps SS5 touchpad
Date: Sat, 28 May 2016 14:00:58 +0200 [thread overview]
Message-ID: <1464436862-2649-1-git-send-email-ben@smart-cactus.org> (raw)
Here is a patchset adding support for the Alps SS5 touchpad hardware shipped
with the Dell Latitude E7470. The protocol is similar to that used by the SS4
v2 devices, but with additional support for a touchstick.
The touchpad exhibits slightly inconsistent behavior when single-finger
contacts are released while a button is being held. This leads to extremely
unpleasant jumps in pointer position, especially during drag-and-drop
operations. This is resolved by patch 2/4.
One minor outstanding issue is the high speed of the touchstick. Previous
touchstick drivers have taken the extremely unfortunate approach of scaling the
input device space to work-around this (often sacrificing device resolution in
the process). I've started another thread on linux-input (see "Should
touchsticks really be relative input devices?") to discuss options for
resolving this.
Cheers,
- Ben
Changes:
v1:
* Initial revision
v2:
* Rework device detection
* Fix contact release behavior of 1F events
* Expose pressure of touchstick
next reply other threads:[~2016-05-28 12:01 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-28 12:00 Ben Gamari [this message]
2016-05-28 12:00 ` [PATCH 1/4] input/alps: Add touchstick support for SS5 hardware Ben Gamari
2016-06-13 13:47 ` Pali Rohár
2016-05-28 12:01 ` [PATCH 2/4] input/alps: Handle 0-pressure 1F events Ben Gamari
2016-06-13 13:49 ` Pali Rohár
2016-05-28 12:01 ` [PATCH 3/4] input/alps: Allow touchsticks to report pressure Ben Gamari
2016-05-28 12:40 ` Hans de Goede
2016-06-10 10:21 ` Ben Gamari
2016-06-10 10:57 ` Hans de Goede
2016-06-13 0:21 ` Peter Hutterer
2016-05-28 12:01 ` [PATCH 4/4] input/alps: Set DualPoint flag for 74 03 28 devices Ben Gamari
2016-05-30 9:11 ` Pali Rohár
2016-06-21 0:43 ` Dmitry Torokhov
2016-05-28 12:37 ` [PATCH v2] Support for Alps SS5 touchpad Hans de Goede
2016-05-28 13:16 ` Ben Gamari
2016-05-28 13:21 ` Hans de Goede
2016-05-30 9:13 ` Pali Rohár
2016-05-30 9:49 ` Ben Gamari
2016-06-20 17:48 ` Pali Rohár
2016-06-21 9:20 ` Ben Gamari
2016-06-29 9:46 ` Pali Rohár
2016-07-17 21:06 ` Ben Gamari
2016-07-17 21:42 ` Pali Rohár
2016-09-05 8:59 ` Pali Rohár
2016-09-06 3:38 ` Ben Gamari
2016-09-06 8:57 ` Pali Rohár
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