code: plan9front

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nusb/kb: fix Glorious Model O mouse

Ensure we are using the DWC OTG before enabling the workaround.
Otherwise, we risk breaking devices which don't like a Setidle
of 8<<8.

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -25,6 +25,7 @@

 	Awakemsg = 0xdeaddead,

 	Diemsg = 0xbeefbeef,

 	Rawon = 0x0defaced,

+	Dwcidle = 8,

 };

 char user[] = "kb";

@@ -38,6 +39,8 @@

 	int	minfd;

 	int	kinfd;

+	int	idle;

+

 	Channel	*repeatc;	/* only for keyboard */

 	/* report descriptor */

@@ -364,14 +367,8 @@

 {

 	int proto;

+	usbcmd(f->dev, Rh2d|Rclass|Riface, Setidle, f->idle<<8, iface->id, nil, 0);

-	/*

-	 * DWC OTG controller misses some split transaction inputs.

-	 * Set nonzero idle time to return more frequent reports

-	 * of keyboard state, to avoid losing key up/down events.

-	 */

-	usbcmd(f->dev, Rh2d|Rclass|Riface, Setidle, 8<<8, iface->id, nil, 0);

-

 	f->nrep = usbcmd(f->dev, Rd2h|Rstd|Riface, Rgetdesc, Dreport<<8, iface->id,

 		f->rep, sizeof(f->rep));

 	if(f->nrep > 0){

@@ -967,6 +964,8 @@

 hdsetup(Dev *d, Ep *ep)

 {

 	Hiddev *f;

+	uchar desc[512];

+	int n;

 	f = emallocz(sizeof(Hiddev), 1);

 	f->minfd = -1;

@@ -973,6 +972,17 @@

 	f->kinfd = -1;

 	incref(d);

 	f->dev = d;

+	/*

+	 * DWC OTG controller misses some split transaction inputs.

+	 * Set nonzero idle time to return more frequent reports

+	 * of keyboard state, to avoid losing key up/down events.

+	 */

+	n = read(d->cfd, desc, sizeof(desc) - 1);

+	if(n > 0){

+		desc[n] = 0;

+		if(strstr((char*)desc, "dwcotg") != nil)

+			f->idle = Dwcidle;

+	}

 	if(setproto(f, ep->iface) < 0){

 		fprint(2, "%s: %s: setproto: %r\n", argv0, d->dir);

 		goto Err;