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Bug 4665 - [patch] Add support for single touch evdev devices
Summary: [patch] Add support for single touch evdev devices
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: events (show other bugs)
Version: HG 2.0
Hardware: All Linux
: P2 enhancement
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-06-12 09:12 UTC by Jan Martin Mikkelsen
Modified: 2019-06-14 00:11 UTC (History)
0 users

See Also:

Attachments
Patch supporting single touch evdev (4.56 KB, patch)
2019-06-12 09:12 UTC, Jan Martin Mikkelsen 		Details | Diff
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Description Jan Martin Mikkelsen 2019-06-12 09:12:33 UTC 
Created attachment 3821 [details]
Patch supporting single touch evdev

The attached patch adds support for single-touch evdev devices.

These devices report ABS_X, ABS_Y and BTN_TOUCH events. This patch sets them up as MT devices with a single slot and handles the appropriate messages.
Comment 1 Sam Lantinga 2019-06-12 14:56:16 UTC 
Patch has been added, thanks!
https://hg.libsdl.org/SDL/rev/5b0bc0ed588a

What are some examples of devices like this?
Comment 2 Jan Martin Mikkelsen 2019-06-13 07:01:38 UTC 
The classical one is the ELO Touchscreen. It's in lots of different devices, especially point-of-sale terminals. We're using this one for industrial applications with an in-house single-touch evdev driver:

http://www.tipro.net/ecatalogue/new-befree22/

The FreeBSD eGalax touchscreen driver also provides a single-touch interface when compiled for evdev. I'm not sure about drivers in the Linux tree; I'm not in that ecosystem.
Comment 3 Sam Lantinga 2019-06-14 00:11:22 UTC 
Got it, thanks!