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Bug 2654

Summary: ID_INPUT_KEY devices skipped
Product: SDL Reporter: Phil Spencer <phil>
Component: *don't know*Assignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: amaranth72, gabomdq, kholm40
Version: 2.0.3   
Hardware: x86_64   
OS: Windows 7   

Description Phil Spencer 2014-07-18 20:22:08 UTC 
SDL_udev.c only adds input devices that identifies as ID_INPUT_MOUSE, ID_INPUT_JOYSTICK or ID_INPUT_KEYBOARD on the Raspberry Pi there are projects that create input over the GPIO using uinput/udev and they are usually identified as ID_INPUT_KEY for a keyboard or ID_INPUT_REL or ID_INPUT_ABS for mice. 

I understand that most platforms this is a non issue but given that platforms like the Pi allow one to create your own input devices this can and is posing a problem to anyone like myself who uses a GPIO interface to simulate input buttons as keys.

I added my own ID_INPUT_KEY block to SDL_udev.c as a simple test and it worked perfectly with no adverse affects other than it resolved my problem.

https://github.com/CrazySpence/Adafruit-Retrogame/blob/master/SDL2.0.3/src/core/linux/SDL_udev.c
Comment 1 Gabriel Jacobo 2014-07-19 13:39:20 UTC 
Isn't this a udev configuration problem? Or put differently, can you add ID_INPUT_KEYBOARD=1 to your device using a udev rule?
Comment 2 Phil Spencer 2014-07-21 22:41:49 UTC 
Sure I could use a udev rule but retrogame isn't just used by me (or created by me) it is a fairly popular gpio-> key input program used by lots of rpi users. 

Not to mention this worked fine with ol sdl 1.2...

The greater concern I would have is what other uinput created devices is this possibly affecting that maybe just have not been reported yet.
Comment 3 kenneth Holm 2014-07-24 01:43:40 UTC 
It would be great to have this fixed. I came across this issue myself where my project stopped working after the update. I searched many forums trying to find a solution and encountered dozens of other people that have the same problem and were looking for a solution as well.
Comment 4 Gabriel Jacobo 2014-10-16 12:42:12 UTC 
Fixed here: https://hg.libsdl.org/SDL/rev/b8e85a5ac99a