On 07/24/2017 03:28 PM, Anthony Jenkins via freebsd-usb wrote:
> 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.
The main problem with uep(4) was either xorg-server or xf86-input-egalax
started doing asynchronous I/O on the device node using fcntl(F_SETOWN);
the original uep(4) expected userland to open(2)/read(2) the device
node. I had to add the FIOSETOWN support, but I don't know if there's a
way to remove a process as owner (call fcntl(F_SETOWN, NULL)?). If so,
I'll need to handle that case.
I can stick this up in the FreeBSD code review site if desired.
> 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:
> x11-servers/xorg-server patch:
> 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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