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Thu, 9 Jan 2020 15:26:16 +0100 (CET) Received: from FE-MBX2049.de.bosch.com (fe-mbx2049.de.bosch.com [10.3.231.59]) by si0vm1949.rbesz01.com (Postfix) with ESMTPS id 47tpMD4cHyz6CjZNg; Thu, 9 Jan 2020 15:26:16 +0100 (CET) Received: from FE-MBX2049.de.bosch.com (10.3.231.59) by FE-MBX2049.de.bosch.com (10.3.231.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.1847.3; Thu, 9 Jan 2020 15:26:16 +0100 Received: from FE-MBX2049.de.bosch.com ([fe80::7145:b7a6:db9a:5829]) by FE-MBX2049.de.bosch.com ([fe80::7145:b7a6:db9a:5829%6]) with mapi id 15.01.1847.005; Thu, 9 Jan 2020 15:26:16 +0100 From: "Leutwein Tobias (BEG/ENC1)" To: "linux-input@vger.kernel.org" CC: =?iso-8859-1?Q?Pali_Roh=E1r?= , "dmitry.torokhov@gmail.com" Subject: [RFC] linux-input alps Thread-Topic: [RFC] linux-input alps Thread-Index: AdXG+Jr4i8+z4wF0QSauVKXro3Jlng== Date: Thu, 9 Jan 2020 14:26:16 +0000 Message-ID: <988f2b799a6046af87a25c996ebbfacb@de.bosch.com> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.42.180.11] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA22TXVAbZRSG+XaXsElZZ7Mk5DSArbGDDh3TxJYSS6cUazs4zihe+DMdQYMs JEoSJhtq6Y3MVGxLq1Sbgg02/AxV6jSBhv6hKDYtrdXWnxlQEuMoNheE0IKpSipC3e1Ckwvv 3u8953nP952dJXFmL6kmzVYHa7caazQSGSHb4Ml5hDSoynU/xPMNF7omkCEQ+zvV8N43c9hm vGTA9UtayS3f/aXYdtnGSrbGvIO1r9n0isx09p9BrLZ12c5r3n68ATVKm5CUBHodfDE6jgma oVsxmD67uQnJeP05gsaPWyTiYQpBaDCGi4chBL2feVATIkkJXQztw3mCVNBF4Ox8VgjCaQ5i 43vuhmbQKyAyNooLWkGvgrmWX9NErYWTnR5cHKyH6GknIWiC73l3/itciKToQtjf/phgIzoH +vq+w8V4FQTD7Zh4fxq6B0UfaCVEri+kinolXJxpxsR+LYwddkpEvRo+6oze7adoOVw5EiYO okxXUqwrCXElIa4kpAMRnyBlFavbYdEXrNNr7RUst0un175qs/iQ+ImU59BMpMqPMBL5UT6J aZTU5WhmOXNfha2y3mTkTC/b62pYTqOm3pzaV8Zk3LO5ugqLmePMNqsfAYlrFNTwGM9Rlcb6 XazdJmJ+lEUSGhVVTT7zEkNXGx3s6yxby9qXqoUkqQHqdL6qnJHb2Wp2Z5W5xrFU1uRQKCUl hclMriSPxUipH60l0/nZDxbwERRXa7Rw5upFfLmIM0tuAv0aPUkejBztwsnzw+4unCGsNiur VlHbhBRa6DfVWe/dQ51NHdmqKGeUSYVE1iQKIBJpMqgF4RXp/B+QuAFQDcLS5ItmAnr0GM/Q QSlMTv+JQTy8H4eePyIEnBk5lwoD/ngaxH+8IoXA7KfpED8xT8Ht6YAc2uZuZ/DEKQW4Q98C +G41ZUHPvtFsOOO8vALCfy08ADf9vavAHd6dC83e6Vz48MKdXOg52fYQjLRe08LIwNQamPjt hg4CPwX1MPRO81rw9rWshwMRjwF8jWMb4QOnuwjeijqLYe/FA49P8uvF+PWGQkphvQ6j43/W u+gmXqduQEG57+oT8/22FydiVy3buxU93vSh166/Xxp7uuPhtmjgyz2ztWx96RvBMl2BenjZ obpLUU/QRWxRjt/ovvn8xMzRU+bfNxw71LG7ki61BKVlx+9syVX0ui8VM5sorNB34t+fi7Ye Pv92f9bybY7136/0Zh7Pkzw19QIxu1rizQ5FS57TEJzJqM/D7ZzxP/be9KKbBAAA Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Hello, At the file https://github.com/torvalds/linux/blob/master/drivers/input/mouse/alps.c I've seen that values coming from the trackpoint/trackstick are divided at = some devices, which results in a loss of precision. As I was not lucky with the behavior of the trackpoint of my computer I've = made a fork of libinput https://gitlab.freedesktop.org/leutwe/libinput/tree= /master/ where I changed src/filter-trackpoint.c . With this change, the values fro= m lib evdev are multiplied by a factor (dpToFac_au16 []). The array element= used from dpToFac_au16 [] is also the value received by evdev. At higher forces I use a factor much higher than 1, so the undivided value = from the device would be the best for me. In order not to change the behavior for other users, it might be possible t= o change the divider at runtime via the sys- file system - like it is at tr= ackpoint.c and take the currently used divider as default value. Positions at source code were I see the division: alps_process_trackstick_packet_v3() /* * The x and y values tend to be quite large, and when used * alone the trackstick is difficult to use. Scale them down * to compensate. */ x /=3D 8; y /=3D 8; alps_process_packet_v6() /* Divide 4 since trackpoint's speed is too fast */ input_report_rel(dev2, = REL_X, (char)x / 4); input_report_rel(dev2, REL_Y, -((char)y / 4)); Best regards Tobias=20