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nusb/kb: add quirks for Elecom HUGE trackball

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As said in the code comment:

	Elecom trackball report descriptor lies by
	omission, failing to mention all its buttons.
	We patch the descriptor with a correct count
	which lets us parse full reports. Tested with:
		Elecom HUGE (M-HT1DRBK, M-HT1URBK)

The descriptor fixup is adapted from Linux kernel:
	drivers/hid/hid-elecom.c
in which a more detailed account of why and how this
works may be found.

A followup change to nusb/kb will be needed to expose
these additional events for potential remapping.
This commit is contained in:
kvik 2020-05-08 20:49:11 +02:00
parent 2c3e60d95b
commit 758edf2b14
1 changed files with 28 additions and 0 deletions
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28
sys/src/cmd/nusb/kb/kb.c
View file

@ -835,6 +835,33 @@ readerproc(void* a)
}
}
static void
quirks(Hiddev *f)
{
Dev *d;
d = f->dev;
/* Elecom trackball report descriptor lies by
* omission, failing to mention all its buttons.
* We patch the descriptor with a correct count
* which lets us parse full reports. Tested with:
* Elecom HUGE (M-HT1DRBK, M-HT1URBK) */
if(d->usb->vid == 0x056e && d->usb->did == 0x010c){
if(f->nrep < 32
|| f->rep[12] != 0x95
|| f->rep[14] != 0x75
|| f->rep[15] != 0x01
|| f->rep[20] != 0x29
|| f->rep[30] != 0x75)
return;
f->rep[13] = 8;
f->rep[21] = 8;
f->rep[31] = 0;
}
}
static void
hdsetup(Dev *d, Ep *ep)
{
@ -858,6 +885,7 @@ hdsetup(Dev *d, Ep *ep)
fprint(2, "%s: %s: opendevdata: %r\n", argv0, f->ep->dir);
goto Err;
}
quirks(f);
procrfork(readerproc, f, Stack, RFNOTEG);
return;
Err: