Date: Mon, 24 Jul 2017 15:28:24 -0400 From: Anthony Jenkins <Scoobi_doo@yahoo.com> To: freebsd-usb@freebsd.org Subject: PATCH: uep(4) support for (my) eGalax touchscreen Message-ID: <9be27e1a-aada-f53a-879f-24d7da4f42be@yahoo.com>
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I'm trying to add support for uep(4) to detect and properly emit touch events to x11-drivers/xf86-input-egalax. What I have works, but has some issues, particularly: - close(2)ing the device node causes a USB_ST_ERROR in the uep_intr_callback(); it's probably from my attempt to port an initialization control message from Linux - I massage the touch events from my device into the legacy uep(4) event structure since my multitouch-supporting touchscreen has 12-bits of resolution per axis, but legacy uep(4) only had 11 - For some reason my Y-axis is inverted; I had to subtract its coordinate from the max Y value. I'll probably add an ioctl(2) to set axis inversion behavior dynamically rather than hardcode it. - I capture all the multitouch info from the USB packets, but I don't know (yet) if xf86-input-egalax can do anything with it - x11-drivers/xf86-input-egalax's default min/max ranges are "silly" (500/1500), but I didn't add the trivial patch to it. I'd like to add an ioctl(2) that lets xf86-input-egalax query uep(4) for axis ranges, but as I've written my patch, uep(4) doesn't know its ranges until it gets a touch packet. - I started adding support for evdev(4) reporting (added header files and device struct members), but it's nowhere near finished. - I have no idea how common this eGalax protocol is or how to determine what protocol to use from the driver. Right now I assume a byte 0 of 0x06 means "multitouch event". - My x11-servers/xorg-server is patched to associate /dev/uep0 with the xf86-input-egalax driver; I guess I'll have to make that available too. My config/devd.c is substantially different from stock. Logging is sort of noisy at the moment when touching the screen, but it "Just Works (TM)" with my touchscreen, my slightly-patched xf86-input-egalax driver and KDE4. uep(4) patch: https://github.com/ScoobiFreeBSD/freebsd/commit/62c11d484d5fb61749240b439612f852c5148222 x11-servers/xorg-server patch: https://github.com/ScoobiFreeBSD/freebsd-ports/commit/9465237f83ab8fb27249abfe803f94b6b8c3b945 Suggestions/comments welcome. Currently looking for help with the USB_ST_ERROR issue, although I think I may know what's wrong (this is my 1st attempt at USB stack programming). Anthony Jenkins
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