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Bug 3989

Summary: evdev events from touchpanel not processed
Product: SDL Reporter: Srki <obucinac>
Component: atomicAssignee: Sam Lantinga <slouken>
Status: NEW --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.1   
Hardware: x86_64   
OS: Linux   

Description Srki 2017-12-04 14:19:00 UTC 
Tested on two touchpanels

ET&T USB 5WUSB
eGalax Inc. eGalaxTouch EXC3188-0510-08.00.00

From SDLs point of view, the difference between these two is in

src/core/linux/SDL_evdev.c

Around line 640

if (udev_class & SDL_UDEV_DEVICE_TOUCHSCREEN) {
        item->is_touchscreen = 1;

First one does not have SDL_UDEV_DEVICE_TOUCHSCREEN flag.


In function

void SDL_EVDEV_Poll(void)

There are unpromising lines, on few places:

if (!item->is_touchscreen) /* FIXME: temp hack */
    break;

All this results in SDL not sending events from the second touch panel.

ABS_MT_POSITION_X and ABS_MT_POSITION_Y do not send mouse events, there is nof  SDL_SendMouseMotion call.

ABS_X and ABS_Y are excluded because of 

case ABS_X:
    if (item->is_touchscreen) /* FIXME: temp hack */
        break;

case ABS_Y:
    if (item->is_touchscreen) /* FIXME: temp hack */
        break;



Evtest event flow for eGalax touch panel.

Event: time 1512395574.817575, -------------- SYN_REPORT ------------
Event: time 1512395574.823567, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1982
Event: time 1512395574.823567, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1760
Event: time 1512395574.823567, type 3 (EV_ABS), code 0 (ABS_X), value 1982
Event: time 1512395574.823567, type 3 (EV_ABS), code 1 (ABS_Y), value 1760
Event: time 1512395574.823567, -------------- SYN_REPORT ------------
Event: time 1512395574.835570, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1747
Event: time 1512395574.835570, type 3 (EV_ABS), code 1 (ABS_Y), value 1747
Event: time 1512395574.835570, -------------- SYN_REPORT ------------
Event: time 1512395574.841574, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1981
Event: time 1512395574.841574, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1734
Event: time 1512395574.841574, type 3 (EV_ABS), code 0 (ABS_X), value 1981
Event: time 1512395574.841574, type 3 (EV_ABS), code 1 (ABS_Y), value 1734
Event: time 1512395574.841574, -------------- SYN_REPORT ------------
Event: time 1512395574.853567, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1721
Event: time 1512395574.853567, type 3 (EV_ABS), code 1 (ABS_Y), value 1721
Event: time 1512395574.853567, -------------- SYN_REPORT ------------
Event: time 1512395574.859566, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1709
Event: time 1512395574.859566, type 3 (EV_ABS), code 1 (ABS_Y), value 1709
Event: time 1512395574.859566, -------------- SYN_REPORT ------------
Event: time 1512395574.870571, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1696
Event: time 1512395574.870571, type 3 (EV_ABS), code 1 (ABS_Y), value 1696
Event: time 1512395574.870571, -------------- SYN_REPORT ------------
Event: time 1512395574.876569, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1682
Event: time 1512395574.876569, type 3 (EV_ABS), code 1 (ABS_Y), value 1682
Event: time 1512395574.876569, -------------- SYN_REPORT ------------
Event: time 1512395574.887567, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1668
Event: time 1512395574.887567, type 3 (EV_ABS), code 1 (ABS_Y), value 1668
Event: time 1512395574.887567, -------------- SYN_REPORT ------------
Event: time 1512395574.893567, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1654
Event: time 1512395574.893567, type 3 (EV_ABS), code 1 (ABS_Y), value 1654
Event: time 1512395574.893567, -------------- SYN_REPORT ------------
Event: time 1512395574.904573, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1640
Event: time 1512395574.904573, type 3 (EV_ABS), code 1 (ABS_Y), value 1640
Event: time 1512395574.904573, -------------- SYN_REPORT ------------
Event: time 1512395574.910568, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1626
Event: time 1512395574.910568, type 3 (EV_ABS), code 1 (ABS_Y), value 1626
Event: time 1512395574.910568, -------------- SYN_REPORT ------------
Event: time 1512395574.922568, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1980
Event: time 1512395574.922568, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1612
Event: time 1512395574.922568, type 3 (EV_ABS), code 0 (ABS_X), value 1980
Event: time 1512395574.922568, type 3 (EV_ABS), code 1 (ABS_Y), value 1612
Event: time 1512395574.922568, -------------- SYN_REPORT ------------
Event: time 1512395574.928567, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1597
Event: time 1512395574.928567, type 3 (EV_ABS), code 1 (ABS_Y), value 1597
Event: time 1512395574.928567, -------------- SYN_REPORT ------------
Event: time 1512395574.940572, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1583
Event: time 1512395574.940572, type 3 (EV_ABS), code 1 (ABS_Y), value 1583
Event: time 1512395574.940572, -------------- SYN_REPORT ------------
Event: time 1512395574.946568, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1569
Event: time 1512395574.946568, type 3 (EV_ABS), code 1 (ABS_Y), value 1569