xref: /openbsd/sys/dev/usb/ukbd.c (revision 81508fe3)
1 /*	$OpenBSD: ukbd.c,v 1.90 2024/05/23 03:21:09 jsg Exp $	*/
2 /*      $NetBSD: ukbd.c,v 1.85 2003/03/11 16:44:00 augustss Exp $        */
3 
4 /*
5  * Copyright (c) 2010 Miodrag Vallat.
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  */
19 /*
20  * Copyright (c) 1998 The NetBSD Foundation, Inc.
21  * All rights reserved.
22  *
23  * This code is derived from software contributed to The NetBSD Foundation
24  * by Lennart Augustsson (lennart@augustsson.net) at
25  * Carlstedt Research & Technology.
26  *
27  * Redistribution and use in source and binary forms, with or without
28  * modification, are permitted provided that the following conditions
29  * are met:
30  * 1. Redistributions of source code must retain the above copyright
31  *    notice, this list of conditions and the following disclaimer.
32  * 2. Redistributions in binary form must reproduce the above copyright
33  *    notice, this list of conditions and the following disclaimer in the
34  *    documentation and/or other materials provided with the distribution.
35  *
36  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
37  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
38  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
40  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
41  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
42  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
43  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
44  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
46  * POSSIBILITY OF SUCH DAMAGE.
47  */
48 
49 /*
50  * HID spec: https://www.usb.org/sites/default/files/hid1_11.pdf
51  */
52 
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/timeout.h>
56 #include <sys/device.h>
57 
58 #include <machine/bus.h>
59 
60 #include <dev/usb/usb.h>
61 #include <dev/usb/usbhid.h>
62 
63 #include <dev/usb/usbdi.h>
64 #include <dev/usb/usbdivar.h> /* needs_reattach() */
65 #include <dev/usb/usbdi_util.h>
66 #include <dev/usb/usbdevs.h>
67 #include <dev/usb/usb_quirks.h>
68 #include <dev/usb/uhidev.h>
69 #include <dev/usb/ukbdvar.h>
70 
71 #include <dev/wscons/wsconsio.h>
72 #include <dev/wscons/wskbdvar.h>
73 #include <dev/wscons/wsksymdef.h>
74 #include <dev/wscons/wsksymvar.h>
75 
76 #include <dev/hid/hidkbdsc.h>
77 
78 #ifdef UKBD_DEBUG
79 #define DPRINTF(x)	do { if (ukbddebug) printf x; } while (0)
80 #define DPRINTFN(n,x)	do { if (ukbddebug>(n)) printf x; } while (0)
81 int	ukbddebug = 0;
82 #else
83 #define DPRINTF(x)
84 #define DPRINTFN(n,x)
85 #endif
86 
87 const kbd_t ukbd_countrylayout[1 + HCC_MAX] = {
88 	(kbd_t)-1,
89 	(kbd_t)-1,	/* arabic */
90 	KB_BE,		/* belgian */
91 	(kbd_t)-1,	/* canadian bilingual */
92 	KB_CF,		/* canadian french */
93 	(kbd_t)-1,	/* czech */
94 	KB_DK,		/* danish */
95 	(kbd_t)-1,	/* finnish */
96 	KB_FR,		/* french */
97 	KB_DE,		/* german */
98 	(kbd_t)-1,	/* greek */
99 	(kbd_t)-1,	/* hebrew */
100 	KB_HU,		/* hungary */
101 	(kbd_t)-1,	/* international (iso) */
102 	KB_IT,		/* italian */
103 	KB_JP,		/* japanese (katakana) */
104 	(kbd_t)-1,	/* korean */
105 	KB_LA,		/* latin american */
106 	(kbd_t)-1,	/* netherlands/dutch */
107 	KB_NO,		/* norwegian */
108 	(kbd_t)-1,	/* persian (farsi) */
109 	KB_PL,		/* polish */
110 	KB_PT,		/* portuguese */
111 	KB_RU,		/* russian */
112 	(kbd_t)-1,	/* slovakia */
113 	KB_ES,		/* spanish */
114 	KB_SV,		/* swedish */
115 	KB_SF,		/* swiss french */
116 	KB_SG,		/* swiss german */
117 	(kbd_t)-1,	/* switzerland */
118 	(kbd_t)-1,	/* taiwan */
119 	KB_TR,		/* turkish Q */
120 	KB_UK,		/* uk */
121 	KB_US,		/* us */
122 	(kbd_t)-1,	/* yugoslavia */
123 	(kbd_t)-1	/* turkish F */
124 };
125 
126 struct ukbd_softc {
127 	struct uhidev		sc_hdev;
128 #define sc_ledsize		sc_hdev.sc_osize
129 
130 	struct hidkbd		sc_kbd;
131 	int			sc_spl;
132 
133 #ifdef DDB
134 	struct timeout		sc_ddb;	/* for entering DDB */
135 #endif
136 };
137 
138 void	ukbd_cngetc(void *, u_int *, int *);
139 void	ukbd_cnpollc(void *, int);
140 void	ukbd_cnbell(void *, u_int, u_int, u_int);
141 void	ukbd_debugger(void *);
142 
143 const struct wskbd_consops ukbd_consops = {
144 	ukbd_cngetc,
145 	ukbd_cnpollc,
146 	ukbd_cnbell,
147 #ifdef DDB
148 	ukbd_debugger,
149 #endif
150 };
151 
152 void	ukbd_intr(struct uhidev *addr, void *ibuf, u_int len);
153 
154 void	ukbd_db_enter(void *);
155 int	ukbd_enable(void *, int);
156 void	ukbd_set_leds(void *, int);
157 int	ukbd_ioctl(void *, u_long, caddr_t, int, struct proc *);
158 
159 const struct wskbd_accessops ukbd_accessops = {
160 	ukbd_enable,
161 	ukbd_set_leds,
162 	ukbd_ioctl,
163 };
164 
165 int	ukbd_match(struct device *, void *, void *);
166 void	ukbd_attach(struct device *, struct device *, void *);
167 int	ukbd_detach(struct device *, int);
168 
169 struct cfdriver ukbd_cd = {
170 	NULL, "ukbd", DV_DULL
171 };
172 
173 const struct cfattach ukbd_ca = {
174 	sizeof(struct ukbd_softc), ukbd_match, ukbd_attach, ukbd_detach
175 };
176 
177 #ifdef __loongson__
178 void	ukbd_gdium_munge(void *, uint8_t *, u_int);
179 #endif
180 
181 const struct usb_devno ukbd_never_console[] = {
182 	/* Apple HID-proxy is always detected before any real USB keyboard */
183 	{ USB_VENDOR_APPLE, USB_PRODUCT_APPLE_BLUETOOTH_HCI },
184 	/* ugold(4) devices, which also present themselves as ukbd */
185 	{ USB_VENDOR_MICRODIA, USB_PRODUCT_MICRODIA_TEMPER },
186 	{ USB_VENDOR_MICRODIA, USB_PRODUCT_MICRODIA_TEMPERHUM },
187 	{ USB_VENDOR_PCSENSORS, USB_PRODUCT_PCSENSORS_TEMPER },
188 	{ USB_VENDOR_RDING, USB_PRODUCT_RDING_TEMPER },
189 	{ USB_VENDOR_WCH2, USB_PRODUCT_WCH2_TEMPER },
190 };
191 
192 int
ukbd_match(struct device * parent,void * match,void * aux)193 ukbd_match(struct device *parent, void *match, void *aux)
194 {
195 	struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)aux;
196 	int size;
197 	void *desc;
198 
199 	if (UHIDEV_CLAIM_MULTIPLE_REPORTID(uha))
200 		return (UMATCH_NONE);
201 
202 	uhidev_get_report_desc(uha->parent, &desc, &size);
203 	if (!hid_is_collection(desc, size, uha->reportid,
204 	    HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_KEYBOARD)))
205 		return (UMATCH_NONE);
206 
207 	return (UMATCH_IFACECLASS);
208 }
209 
210 void
ukbd_attach(struct device * parent,struct device * self,void * aux)211 ukbd_attach(struct device *parent, struct device *self, void *aux)
212 {
213 	struct ukbd_softc *sc = (struct ukbd_softc *)self;
214 	struct hidkbd *kbd = &sc->sc_kbd;
215 	struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)aux;
216 	struct usb_hid_descriptor *hid;
217 	u_int32_t quirks, qflags = 0;
218 	int dlen, repid;
219 	int console = 1;
220 	void *desc;
221 	kbd_t layout = (kbd_t)-1;
222 
223 	sc->sc_hdev.sc_intr = ukbd_intr;
224 	sc->sc_hdev.sc_parent = uha->parent;
225 	sc->sc_hdev.sc_udev = uha->uaa->device;
226 	sc->sc_hdev.sc_report_id = uha->reportid;
227 
228 	usbd_set_idle(uha->parent->sc_udev, uha->parent->sc_ifaceno, 0, 0);
229 
230 	uhidev_get_report_desc(uha->parent, &desc, &dlen);
231 	repid = uha->reportid;
232 	sc->sc_hdev.sc_isize = hid_report_size(desc, dlen, hid_input, repid);
233 	sc->sc_hdev.sc_osize = hid_report_size(desc, dlen, hid_output, repid);
234 	sc->sc_hdev.sc_fsize = hid_report_size(desc, dlen, hid_feature, repid);
235 
236 	 /*
237 	  * Do not allow unwanted devices to claim the console.
238 	  */
239 	if (usb_lookup(ukbd_never_console, uha->uaa->vendor, uha->uaa->product))
240 		console = 0;
241 
242 	quirks = usbd_get_quirks(sc->sc_hdev.sc_udev)->uq_flags;
243 	if (quirks & UQ_SPUR_BUT_UP)
244 		qflags |= HIDKBD_SPUR_BUT_UP;
245 
246 	if (hidkbd_attach(self, kbd, console, qflags, repid, desc, dlen) != 0)
247 		return;
248 
249 	if (uha->uaa->vendor == USB_VENDOR_APPLE) {
250 		if (hid_locate(desc, dlen, HID_USAGE2(HUP_APPLE, HUG_FN_KEY),
251 		    uha->reportid, hid_input, &kbd->sc_fn, &qflags)) {
252 			if (qflags & HIO_VARIABLE) {
253 				switch (uha->uaa->product) {
254 				case USB_PRODUCT_APPLE_FOUNTAIN_ISO:
255 				case USB_PRODUCT_APPLE_GEYSER_ISO:
256 				case USB_PRODUCT_APPLE_GEYSER3_ISO:
257 				case USB_PRODUCT_APPLE_WELLSPRING6_ISO:
258 				case USB_PRODUCT_APPLE_WELLSPRING8_ISO:
259 					kbd->sc_munge = hidkbd_apple_iso_munge;
260 					break;
261 				case USB_PRODUCT_APPLE_WELLSPRING_ISO:
262 				case USB_PRODUCT_APPLE_WELLSPRING4_ISO:
263 				case USB_PRODUCT_APPLE_WELLSPRING4A_ISO:
264 					kbd->sc_munge = hidkbd_apple_iso_mba_munge;
265 					break;
266 				case USB_PRODUCT_APPLE_WELLSPRING_ANSI:
267 				case USB_PRODUCT_APPLE_WELLSPRING_JIS:
268 				case USB_PRODUCT_APPLE_WELLSPRING4_ANSI:
269 				case USB_PRODUCT_APPLE_WELLSPRING4_JIS:
270 				case USB_PRODUCT_APPLE_WELLSPRING4A_ANSI:
271 				case USB_PRODUCT_APPLE_WELLSPRING4A_JIS:
272 					kbd->sc_munge = hidkbd_apple_mba_munge;
273 					break;
274 				default:
275 					kbd->sc_munge = hidkbd_apple_munge;
276 					break;
277 				}
278 			}
279 		}
280 	}
281 
282 	if (uha->uaa->vendor == USB_VENDOR_TOPRE &&
283 	    uha->uaa->product == USB_PRODUCT_TOPRE_HHKB) {
284 		/* ignore country code on purpose */
285 	} else {
286 		usb_interface_descriptor_t *id;
287 
288 		id = usbd_get_interface_descriptor(uha->uaa->iface);
289 		hid = usbd_get_hid_descriptor(uha->uaa->device, id);
290 
291 		if (hid->bCountryCode <= HCC_MAX)
292 			layout = ukbd_countrylayout[hid->bCountryCode];
293 #ifdef DIAGNOSTIC
294 		if (hid->bCountryCode != 0)
295 			printf(", country code %d", hid->bCountryCode);
296 #endif
297 	}
298 	if (layout == (kbd_t)-1) {
299 #ifdef UKBD_LAYOUT
300 		layout = UKBD_LAYOUT;
301 #else
302 		layout = KB_US | KB_DEFAULT;
303 #endif
304 	}
305 
306 	printf("\n");
307 
308 #ifdef __loongson__
309 	if (uha->uaa->vendor == USB_VENDOR_CYPRESS &&
310 	    uha->uaa->product == USB_PRODUCT_CYPRESS_LPRDK)
311 		kbd->sc_munge = ukbd_gdium_munge;
312 #endif
313 
314 	if (kbd->sc_console_keyboard) {
315 		extern struct wskbd_mapdata ukbd_keymapdata;
316 
317 		DPRINTF(("ukbd_attach: console keyboard sc=%p\n", sc));
318 		ukbd_keymapdata.layout = layout;
319 		wskbd_cnattach(&ukbd_consops, sc, &ukbd_keymapdata);
320 		ukbd_enable(sc, 1);
321 	}
322 
323 	/* Flash the leds; no real purpose, just shows we're alive. */
324 	ukbd_set_leds(sc, WSKBD_LED_SCROLL | WSKBD_LED_NUM |
325 		          WSKBD_LED_CAPS | WSKBD_LED_COMPOSE);
326 	usbd_delay_ms(sc->sc_hdev.sc_udev, 400);
327 	ukbd_set_leds(sc, 0);
328 
329 	hidkbd_attach_wskbd(kbd, layout, &ukbd_accessops);
330 
331 #ifdef DDB
332 	timeout_set(&sc->sc_ddb, ukbd_db_enter, sc);
333 #endif
334 }
335 
336 int
ukbd_detach(struct device * self,int flags)337 ukbd_detach(struct device *self, int flags)
338 {
339 	struct ukbd_softc *sc = (struct ukbd_softc *)self;
340 	struct hidkbd *kbd = &sc->sc_kbd;
341 	int rv;
342 
343 	rv = hidkbd_detach(kbd, flags);
344 
345 	/* The console keyboard does not get a disable call, so check pipe. */
346 	if (sc->sc_hdev.sc_state & UHIDEV_OPEN)
347 		uhidev_close(&sc->sc_hdev);
348 
349 	return (rv);
350 }
351 
352 void
ukbd_intr(struct uhidev * addr,void * ibuf,u_int len)353 ukbd_intr(struct uhidev *addr, void *ibuf, u_int len)
354 {
355 	struct ukbd_softc *sc = (struct ukbd_softc *)addr;
356 	struct hidkbd *kbd = &sc->sc_kbd;
357 
358 	if (kbd->sc_enabled != 0)
359 		hidkbd_input(kbd, (uint8_t *)ibuf, len);
360 }
361 
362 int
ukbd_enable(void * v,int on)363 ukbd_enable(void *v, int on)
364 {
365 	struct ukbd_softc *sc = v;
366 	struct hidkbd *kbd = &sc->sc_kbd;
367 	int rv;
368 
369 	if (on && usbd_is_dying(sc->sc_hdev.sc_udev))
370 		return EIO;
371 
372 	if ((rv = hidkbd_enable(kbd, on)) != 0)
373 		return rv;
374 
375 	if (on) {
376 		return uhidev_open(&sc->sc_hdev);
377 	} else {
378 		uhidev_close(&sc->sc_hdev);
379 		return 0;
380 	}
381 }
382 
383 void
ukbd_set_leds(void * v,int leds)384 ukbd_set_leds(void *v, int leds)
385 {
386 	struct ukbd_softc *sc = v;
387 	struct hidkbd *kbd = &sc->sc_kbd;
388 	u_int8_t res;
389 
390 	if (usbd_is_dying(sc->sc_hdev.sc_udev))
391 		return;
392 
393 	if (sc->sc_ledsize && hidkbd_set_leds(kbd, leds, &res) != 0)
394 		uhidev_set_report_async(sc->sc_hdev.sc_parent,
395 		    UHID_OUTPUT_REPORT, sc->sc_hdev.sc_report_id, &res, 1);
396 }
397 
398 int
ukbd_ioctl(void * v,u_long cmd,caddr_t data,int flag,struct proc * p)399 ukbd_ioctl(void *v, u_long cmd, caddr_t data, int flag, struct proc *p)
400 {
401 	struct ukbd_softc *sc = v;
402 	struct hidkbd *kbd = &sc->sc_kbd;
403 	int rc;
404 
405 	switch (cmd) {
406 	case WSKBDIO_GTYPE:
407 		*(int *)data = WSKBD_TYPE_USB;
408 		return (0);
409 	case WSKBDIO_SETLEDS:
410 		ukbd_set_leds(v, *(int *)data);
411 		return (0);
412 	default:
413 		rc = uhidev_ioctl(&sc->sc_hdev, cmd, data, flag, p);
414 		if (rc != -1)
415 			return rc;
416 		else
417 			return hidkbd_ioctl(kbd, cmd, data, flag, p);
418 	}
419 }
420 
421 /* Console interface. */
422 void
ukbd_cngetc(void * v,u_int * type,int * data)423 ukbd_cngetc(void *v, u_int *type, int *data)
424 {
425 	struct ukbd_softc *sc = v;
426 	struct hidkbd *kbd = &sc->sc_kbd;
427 
428 	DPRINTFN(0,("ukbd_cngetc: enter\n"));
429 	kbd->sc_polling = 1;
430 	while (kbd->sc_npollchar <= 0)
431 		usbd_dopoll(sc->sc_hdev.sc_udev);
432 	kbd->sc_polling = 0;
433 	hidkbd_cngetc(kbd, type, data);
434 	DPRINTFN(0,("ukbd_cngetc: return 0x%02x\n", *data));
435 }
436 
437 void
ukbd_cnpollc(void * v,int on)438 ukbd_cnpollc(void *v, int on)
439 {
440 	struct ukbd_softc *sc = v;
441 
442 	DPRINTFN(2,("ukbd_cnpollc: sc=%p on=%d\n", v, on));
443 
444 	if (on)
445 		sc->sc_spl = splusb();
446 	else
447 		splx(sc->sc_spl);
448 	usbd_set_polling(sc->sc_hdev.sc_udev, on);
449 }
450 
451 void
ukbd_cnbell(void * v,u_int pitch,u_int period,u_int volume)452 ukbd_cnbell(void *v, u_int pitch, u_int period, u_int volume)
453 {
454 	hidkbd_bell(pitch, period, volume, 1);
455 }
456 
457 #ifdef DDB
458 void
ukbd_debugger(void * v)459 ukbd_debugger(void *v)
460 {
461 	struct ukbd_softc *sc = v;
462 
463 	/*
464 	 * For the console keyboard we can't deliver CTL-ALT-ESC
465 	 * from the interrupt routine.  Doing so would start
466 	 * polling from inside the interrupt routine and that
467 	 * loses bigtime.
468 	 */
469 	timeout_add(&sc->sc_ddb, 1);
470 }
471 
472 void
ukbd_db_enter(void * xsc)473 ukbd_db_enter(void *xsc)
474 {
475 	db_enter();
476 }
477 #endif
478 
479 int
ukbd_cnattach(void)480 ukbd_cnattach(void)
481 {
482 	struct ukbd_softc *sc;
483 	int i;
484 
485 	/*
486 	 * XXX USB requires too many parts of the kernel to be running
487 	 * XXX in order to work, so we can't do much for the console
488 	 * XXX keyboard until autoconfiguration has run its course.
489 	 */
490 	hidkbd_is_console = 1;
491 
492 	if (!cold) {
493 		/*
494 		 * When switching console dynamically force all USB keyboards
495 		 * to re-attach and possibly became the 'console' keyboard.
496 		 */
497 		for (i = 0; i < ukbd_cd.cd_ndevs; i++) {
498 			if ((sc = ukbd_cd.cd_devs[i]) != NULL) {
499 				usb_needs_reattach(sc->sc_hdev.sc_udev);
500 				break;
501 			}
502 		}
503 	}
504 
505 	return (0);
506 }
507 
508 #ifdef __loongson__
509 /*
510  * Software Fn- translation for Gdium Liberty keyboard.
511  */
512 #define	GDIUM_FN_CODE	0x82
513 void
ukbd_gdium_munge(void * vsc,uint8_t * ibuf,u_int ilen)514 ukbd_gdium_munge(void *vsc, uint8_t *ibuf, u_int ilen)
515 {
516 	struct ukbd_softc *sc = vsc;
517 	struct hidkbd *kbd = &sc->sc_kbd;
518 	uint8_t *pos, *spos, *epos, xlat;
519 	int fn;
520 
521 	static const struct hidkbd_translation gdium_fn_trans[] = {
522 #ifdef notyet
523 		{ 58, 0 },	/* F1 -> toggle camera */
524 		{ 59, 0 },	/* F2 -> toggle wireless */
525 #endif
526 		{ 60, 127 },	/* F3 -> audio mute */
527 		{ 61, 128 },	/* F4 -> audio raise */
528 		{ 62, 129 },	/* F5 -> audio lower */
529 #ifdef notyet
530 		{ 63, 0 },	/* F6 -> toggle ext. video */
531 		{ 64, 0 },	/* F7 -> toggle mouse */
532 		{ 65, 0 },	/* F8 -> brightness up */
533 		{ 66, 0 },	/* F9 -> brightness down */
534 		{ 67, 0 },	/* F10 -> suspend */
535 		{ 68, 0 },	/* F11 -> user1 */
536 		{ 69, 0 },	/* F12 -> user2 */
537 		{ 70, 0 },	/* print screen -> sysrq */
538 #endif
539 		{ 76, 71 },	/* delete -> scroll lock */
540 		{ 81, 78 },	/* down -> page down */
541 		{ 82, 75 }	/* up -> page up */
542 	};
543 
544 	spos = ibuf + kbd->sc_keycodeloc.pos / 8;
545 	epos = spos + kbd->sc_nkeycode;
546 
547 	/*
548 	 * Check for Fn key being down and remove it from the report.
549 	 */
550 
551 	fn = 0;
552 	for (pos = spos; pos != epos; pos++)
553 		if (*pos == GDIUM_FN_CODE) {
554 			fn = 1;
555 			*pos = 0;
556 			break;
557 		}
558 
559 	/*
560 	 * Rewrite keycodes on the fly to perform Fn-key translation.
561 	 * Keycodes without a translation are passed unaffected.
562 	 */
563 
564 	if (fn != 0)
565 		for (pos = spos; pos != epos; pos++) {
566 			xlat = hidkbd_translate(gdium_fn_trans,
567 			    nitems(gdium_fn_trans), *pos);
568 			if (xlat != 0)
569 				*pos = xlat;
570 		}
571 
572 }
573 #endif
574