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Bug 4665

Summary: [patch] Add support for single touch evdev devices
Product: SDL Reporter: Jan Martin Mikkelsen <janm>
Component: eventsAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: enhancement    
Priority: P2    
Version: HG 2.0   
Hardware: All   
OS: Linux   
Attachments: Patch supporting single touch evdev

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!