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hvkbd.c revision 1.3 
      1 /*	$NetBSD: hvkbd.c,v 1.3 2019/10/01 18:00:08 chs Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2017 Microsoft Corp.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice unmodified, this list of conditions, and the following
     12  *    disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  *
     28  * $FreeBSD: head/sys/dev/hyperv/input/hv_kbd.c 317821 2017-05-05 03:28:30Z sephe $
     29  * $FreeBSD: head/sys/dev/hyperv/input/hv_kbdc.c 320490 2017-06-30 03:01:22Z sephe $
     30  * $FreeBSD: head/sys/dev/hyperv/input/hv_kbdc.h 316515 2017-04-05 05:01:23Z sephe $
     31  */
     32 
     33 #ifdef _KERNEL_OPT
     34 #include "opt_pckbd_layout.h"
     35 #include "opt_wsdisplay_compat.h"
     36 #endif /* _KERNEL_OPT */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: hvkbd.c,v 1.3 2019/10/01 18:00:08 chs Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/device.h>
     44 #include <sys/mutex.h>
     45 #include <sys/kernel.h>
     46 #include <sys/kmem.h>
     47 #include <sys/module.h>
     48 #include <sys/pmf.h>
     49 #include <sys/proc.h>
     50 #include <sys/queue.h>
     51 
     52 #include <dev/hyperv/vmbusvar.h>
     53 #include <dev/hyperv/hvkbdvar.h>
     54 
     55 #include <dev/wscons/wsconsio.h>
     56 #include <dev/wscons/wskbdvar.h>
     57 #include <dev/wscons/wsksymdef.h>
     58 #include <dev/wscons/wsksymvar.h>
     59 #include <dev/pckbport/wskbdmap_mfii.h>
     60 
     61 #define HVKBD_BUFSIZE		(4 * PAGE_SIZE)
     62 #define HVKBD_TX_RING_SIZE	(10 * PAGE_SIZE)
     63 #define HVKBD_RX_RING_SIZE	(10 * PAGE_SIZE)
     64 
     65 #define HVKBD_VER_MAJOR		(1)
     66 #define HVKBD_VER_MINOR		(0)
     67 #define HVKBD_VERSION		((HVKBD_VER_MAJOR << 16) | HVKBD_VER_MINOR)
     68 
     69 enum hvkbd_msg_type {
     70 	HVKBD_PROTO_REQUEST		= 1,
     71 	HVKBD_PROTO_RESPONSE		= 2,
     72 	HVKBD_PROTO_EVENT		= 3,
     73 	HVKBD_PROTO_LED_INDICATORS	= 4
     74 };
     75 
     76 struct hvkbd_msg_hdr {
     77 	uint32_t		type;
     78 } __packed;
     79 
     80 struct hvkbd_proto_req {
     81 	struct hvkbd_msg_hdr	hdr;
     82 	uint32_t		ver;
     83 } __packed;
     84 
     85 struct hvkbd_proto_resp {
     86 	struct hvkbd_msg_hdr	hdr;
     87 	uint32_t		status;
     88 #define	RESP_STATUS_ACCEPTED	__BIT(0)
     89 } __packed;
     90 
     91 struct keystroke {
     92 	uint16_t		makecode;
     93 	uint16_t		pad0;
     94 	uint32_t		info;
     95 #define KS_INFO_UNICODE		__BIT(0)
     96 #define KS_INFO_BREAK		__BIT(1)
     97 #define KS_INFO_E0		__BIT(2)
     98 #define KS_INFO_E1		__BIT(3)
     99 } __packed;
    100 
    101 struct hvkbd_keystroke {
    102 	struct hvkbd_msg_hdr	hdr;
    103 	struct keystroke	ks;
    104 } __packed;
    105 
    106 struct hvkbd_keystroke_info {
    107 	LIST_ENTRY(hvkbd_keystroke_info)	link;
    108 	STAILQ_ENTRY(hvkbd_keystroke_info)	slink;
    109 	struct keystroke			ks;
    110 };
    111 
    112 #define	HVKBD_KEYBUF_SIZE	16
    113 
    114 struct hvkbd_softc {
    115 	device_t				sc_dev;
    116 
    117 	struct vmbus_channel    		*sc_chan;
    118 	void					*sc_buf;
    119 
    120 	kmutex_t				sc_ks_lock;
    121 	LIST_HEAD(, hvkbd_keystroke_info)	sc_ks_free;
    122 	STAILQ_HEAD(, hvkbd_keystroke_info)	sc_ks_queue;
    123 
    124 	int					sc_enabled;
    125 	int					sc_polling;
    126 	int					sc_console_keyboard;
    127 #if defined(WSDISPLAY_COMPAT_RAWKBD)
    128 	int					sc_rawkbd;
    129 #endif
    130 
    131 	int					sc_connected;
    132 	uint32_t				sc_connect_status;
    133 
    134 	device_t				sc_wskbddev;
    135 };
    136 
    137 static int	hvkbd_match(device_t, cfdata_t, void *);
    138 static void	hvkbd_attach(device_t, device_t, void *);
    139 
    140 CFATTACH_DECL_NEW(hvkbd, sizeof(struct hvkbd_softc),
    141     hvkbd_match, hvkbd_attach, NULL, NULL);
    142 
    143 static int	hvkbd_alloc_keybuf(struct hvkbd_softc *);
    144 static void	hvkbd_free_keybuf(struct hvkbd_softc *);
    145 
    146 static int	hvkbd_enable(void *, int);
    147 static void	hvkbd_set_leds(void *, int);
    148 static int	hvkbd_ioctl(void *, u_long, void *, int, struct lwp *);
    149 
    150 static const struct wskbd_accessops hvkbd_accessops = {
    151 	hvkbd_enable,
    152 	hvkbd_set_leds,
    153 	hvkbd_ioctl,
    154 };
    155 
    156 static const struct wskbd_mapdata hvkbd_keymapdata = {
    157 	pckbd_keydesctab,
    158 #if defined(PCKBD_LAYOUT)
    159 	PCKBD_LAYOUT,
    160 #else
    161 	KB_US,
    162 #endif
    163 };
    164 
    165 static int	hvkbd_connect(struct hvkbd_softc *);
    166 static void	hvkbd_intr(void *);
    167 
    168 static void	hvkbd_cngetc(void *, u_int *, int *);
    169 static void	hvkbd_cnpollc(void *, int);
    170 
    171 static const struct wskbd_consops hvkbd_consops = {
    172 	.getc =  hvkbd_cngetc,
    173 	.pollc = hvkbd_cnpollc,
    174 	.bell =  NULL,
    175 };
    176 
    177 static int	hvkbd_is_console;
    178 
    179 static int
    180 hvkbd_match(device_t parent, cfdata_t cf, void *aux)
    181 {
    182 	struct vmbus_attach_args *aa = aux;
    183 
    184 	if (memcmp(aa->aa_type, &hyperv_guid_kbd, sizeof(*aa->aa_type)) != 0)
    185 		return 0;
    186 
    187 	/* If hvkbd(4) is not console, we use pckbd(4) in Gen.1 VM. */
    188 	if (!hvkbd_is_console && hyperv_is_gen1())
    189 		return 0;
    190 
    191 	return 1;
    192 }
    193 
    194 static void
    195 hvkbd_attach(device_t parent, device_t self, void *aux)
    196 {
    197 	struct hvkbd_softc *sc = device_private(self);
    198 	struct vmbus_attach_args *aa = aux;
    199 	struct wskbddev_attach_args a;
    200 
    201 	sc->sc_dev = self;
    202 	sc->sc_chan = aa->aa_chan;
    203 
    204 	aprint_naive("\n");
    205 	aprint_normal(": Hyper-V Synthetic Keyboard\n");
    206 
    207 	mutex_init(&sc->sc_ks_lock, MUTEX_DEFAULT, IPL_TTY);
    208 	LIST_INIT(&sc->sc_ks_free);
    209 	STAILQ_INIT(&sc->sc_ks_queue);
    210 	hvkbd_alloc_keybuf(sc);
    211 
    212 	sc->sc_buf = kmem_zalloc(HVKBD_BUFSIZE, KM_SLEEP);
    213 	if (vmbus_channel_setdeferred(sc->sc_chan, device_xname(self))) {
    214 		aprint_error_dev(self,
    215 		    "failed to create the interrupt thread\n");
    216 		goto free_buf;
    217 	}
    218 
    219 	sc->sc_chan->ch_flags &= ~CHF_BATCHED;
    220 	if (vmbus_channel_open(sc->sc_chan,
    221 	    HVKBD_TX_RING_SIZE + HVKBD_RX_RING_SIZE, NULL, 0, hvkbd_intr, sc)) {
    222 		aprint_error_dev(self, "failed to open channel\n");
    223 		goto free_buf;
    224 	}
    225 
    226 	if (hvkbd_connect(sc))
    227 		goto free_buf;
    228 
    229 	if (!pmf_device_register(self, NULL, NULL))
    230 		aprint_error_dev(self, "couldn't establish power handler\n");
    231 
    232 	sc->sc_console_keyboard = hvkbd_is_console;
    233 	if (hvkbd_is_console)
    234 		hvkbd_is_console = 0;
    235 
    236 	if (sc->sc_console_keyboard) {
    237 		wskbd_cnattach(&hvkbd_consops, sc, &hvkbd_keymapdata);
    238 		hvkbd_enable(sc, 1);
    239 	}
    240 
    241 	a.console = sc->sc_console_keyboard;
    242 	a.keymap = &hvkbd_keymapdata;
    243 	a.accessops = &hvkbd_accessops;
    244 	a.accesscookie = sc;
    245 	sc->sc_wskbddev = config_found(self, &a, wskbddevprint);
    246 	return;
    247 
    248 free_buf:
    249 	if (sc->sc_buf != NULL) {
    250 		kmem_free(sc->sc_buf, HVKBD_BUFSIZE);
    251 		sc->sc_buf = NULL;
    252 	}
    253 	hvkbd_free_keybuf(sc);
    254 }
    255 
    256 static int
    257 hvkbd_alloc_keybuf(struct hvkbd_softc *sc)
    258 {
    259 	struct hvkbd_keystroke_info *ksi;
    260 	int i;
    261 
    262 	for (i = 0; i < HVKBD_KEYBUF_SIZE; i++) {
    263 		ksi = kmem_zalloc(sizeof(*ksi), KM_SLEEP);
    264 		LIST_INSERT_HEAD(&sc->sc_ks_free, ksi, link);
    265 	}
    266 
    267 	return 0;
    268 }
    269 
    270 static void
    271 hvkbd_free_keybuf(struct hvkbd_softc *sc)
    272 {
    273 	struct hvkbd_keystroke_info *ksi;
    274 
    275 	while ((ksi = STAILQ_FIRST(&sc->sc_ks_queue)) != NULL) {
    276 		STAILQ_REMOVE(&sc->sc_ks_queue, ksi, hvkbd_keystroke_info,
    277 		    slink);
    278 		kmem_free(ksi, sizeof(*ksi));
    279 	}
    280 	while ((ksi = LIST_FIRST(&sc->sc_ks_free)) != NULL) {
    281 		LIST_REMOVE(ksi, link);
    282 		kmem_free(ksi, sizeof(*ksi));
    283 	}
    284 }
    285 
    286 int
    287 hvkbd_enable(void *v, int on)
    288 {
    289 	struct hvkbd_softc *sc = v;
    290 
    291 	sc->sc_enabled = on;
    292 
    293 	return 0;
    294 }
    295 
    296 static void
    297 hvkbd_set_leds(void *v, int leds)
    298 {
    299 }
    300 
    301 static int
    302 hvkbd_ioctl(void *v, u_long cmd, void *data, int flag, struct lwp *l)
    303 {
    304 #if defined(WSDISPLAY_COMPAT_RAWKBD)
    305 	struct hvkbd_softc *sc = v;
    306 #endif
    307 
    308 	switch (cmd) {
    309 	case WSKBDIO_GTYPE:
    310 		*(int *)data = WSKBD_TYPE_HYPERV;
    311 		return 0;
    312 
    313 	case WSKBDIO_SETLEDS:
    314 		hvkbd_set_leds(v, *(int *)data);
    315 		return 0;
    316 
    317 	case WSKBDIO_GETLEDS:
    318 		*(int *)data = 0;
    319 		return 0;
    320 
    321 #if defined(WSDISPLAY_COMPAT_RAWKBD)
    322 	case WSKBDIO_SETMODE:
    323 		sc->sc_rawkbd = (*(int *)data == WSKBD_RAW);
    324 		return 0;
    325 #endif
    326 	}
    327 
    328 	return EPASSTHROUGH;
    329 }
    330 
    331 static int
    332 hvkbd_connect(struct hvkbd_softc *sc)
    333 {
    334 	struct hvkbd_proto_req req;
    335 	int timo = 100;
    336 	int error, s;
    337 
    338 	sc->sc_connected = 0;
    339 
    340 	memset(&req, 0, sizeof(req));
    341 	req.hdr.type = HVKBD_PROTO_REQUEST;
    342 	req.ver = HVKBD_VERSION;
    343 	error = vmbus_channel_send(sc->sc_chan, &req, sizeof(req),
    344 	    0, VMBUS_CHANPKT_TYPE_INBAND, VMBUS_CHANPKT_FLAG_RC);
    345 	if (error) {
    346 		aprint_error_dev(sc->sc_dev, "failed to send connect: %d\n",
    347 		    error);
    348 		return error;
    349 	}
    350 
    351 	do {
    352 		if (cold)
    353 			delay(1000);
    354 		else
    355 			tsleep(sc, PRIBIO | PCATCH, "hvkbdcon", 1);
    356 		s = spltty();
    357 		hvkbd_intr(sc);
    358 		splx(s);
    359 	} while (--timo > 0 && sc->sc_connected == 0);
    360 
    361 	if (timo == 0 && sc->sc_connected == 0) {
    362 		aprint_error_dev(sc->sc_dev, "connect timed out\n");
    363 		return ETIMEDOUT;
    364 	}
    365 
    366 	if (!(sc->sc_connect_status & RESP_STATUS_ACCEPTED)) {
    367 		aprint_error_dev(sc->sc_dev, "protocol request failed\n");
    368 		return ENODEV;
    369 	}
    370 
    371 	return 0;
    372 }
    373 
    374 static int
    375 hvkbd_keybuf_add_keystroke(struct hvkbd_softc *sc, const struct keystroke *ks)
    376 {
    377 	struct hvkbd_keystroke_info *ksi;
    378 
    379 	mutex_enter(&sc->sc_ks_lock);
    380 	ksi = LIST_FIRST(&sc->sc_ks_free);
    381 	if (ksi != NULL) {
    382 		LIST_REMOVE(ksi, link);
    383 		ksi->ks = *ks;
    384 		STAILQ_INSERT_TAIL(&sc->sc_ks_queue, ksi, slink);
    385 	}
    386 	mutex_exit(&sc->sc_ks_lock);
    387 
    388 	return (ksi != NULL) ? 0 : 1;
    389 }
    390 
    391 static int
    392 hvkbd_decode(struct hvkbd_softc *sc, u_int *type, int *scancode)
    393 {
    394 	struct hvkbd_keystroke_info *ksi;
    395 	struct keystroke ks;
    396 
    397 	mutex_enter(&sc->sc_ks_lock);
    398 	ksi = STAILQ_FIRST(&sc->sc_ks_queue);
    399 	if (ksi != NULL) {
    400 		STAILQ_REMOVE_HEAD(&sc->sc_ks_queue, slink);
    401 		ks = ksi->ks;
    402 		LIST_INSERT_HEAD(&sc->sc_ks_free, ksi, link);
    403 	}
    404 	mutex_exit(&sc->sc_ks_lock);
    405 
    406 	if (ksi == NULL)
    407 		return 0;
    408 
    409 	/*
    410 	 * XXX: Hyper-V host send unicode to VM through 'Type clipboard text',
    411 	 * the mapping from unicode to scancode depends on the keymap.
    412 	 * It is so complicated that we do not plan to support it yet.
    413 	 */
    414 	if (ks.info & KS_INFO_UNICODE)
    415 		return 0;
    416 
    417 	*type = (ks.info & KS_INFO_BREAK) ?
    418 	    WSCONS_EVENT_KEY_UP : WSCONS_EVENT_KEY_DOWN;
    419 	*scancode = ks.makecode;
    420 	return 1;
    421 }
    422 
    423 #if defined(WSDISPLAY_COMPAT_RAWKBD)
    424 static int
    425 hvkbd_encode(struct hvkbd_softc *sc, u_char *buf, int *len)
    426 {
    427 	struct hvkbd_keystroke_info *ksi;
    428 	struct keystroke ks;
    429 	int i;
    430 
    431 	mutex_enter(&sc->sc_ks_lock);
    432 	ksi = STAILQ_FIRST(&sc->sc_ks_queue);
    433 	if (ksi != NULL) {
    434 		STAILQ_REMOVE_HEAD(&sc->sc_ks_queue, slink);
    435 		ks = ksi->ks;
    436 		LIST_INSERT_HEAD(&sc->sc_ks_free, ksi, link);
    437 	}
    438 	mutex_exit(&sc->sc_ks_lock);
    439 
    440 	if (ksi == NULL)
    441 		return 0;
    442 
    443 	/*
    444 	 * XXX: Hyper-V host send unicode to VM through 'Type clipboard text',
    445 	 * the mapping from unicode to scancode depends on the keymap.
    446 	 * It is so complicated that we do not plan to support it yet.
    447 	 */
    448 	if (ks.info & KS_INFO_UNICODE)
    449 		return 0;
    450 
    451 	i = 0;
    452 	if (ks.info & (KS_INFO_E0|KS_INFO_E1)) {
    453 		if (ks.info & KS_INFO_E0)
    454 			buf[i++] = 0xe0;
    455 		else
    456 			buf[i++] = 0xe1;
    457 	}
    458 	if (ks.info & KS_INFO_BREAK)
    459 		buf[i++] = (u_char)ks.makecode & 0x80;
    460 	else
    461 		buf[i++] = (u_char)ks.makecode;
    462 
    463 	KDASSERT(i <= *len);
    464 	*len = i;
    465 
    466 	return 1;
    467 }
    468 #endif
    469 
    470 static void
    471 hvkbd_intr(void *xsc)
    472 {
    473 	struct hvkbd_softc *sc = xsc;
    474 	struct vmbus_chanpkt_hdr *cph;
    475 	const struct hvkbd_msg_hdr *hdr;
    476 	const struct hvkbd_proto_resp *rsp;
    477 	const struct hvkbd_keystroke *ks;
    478 	uint64_t rid;
    479 	uint32_t rlen;
    480 	u_int type;
    481 	int key, error;
    482 
    483 	for (;;) {
    484 		error = vmbus_channel_recv(sc->sc_chan, sc->sc_buf,
    485 		    HVKBD_BUFSIZE, &rlen, &rid, 1);
    486 		if (error != 0 || rlen == 0) {
    487 			if (error != EAGAIN)
    488 				device_printf(sc->sc_dev,
    489 				    "failed to receive a reply packet\n");
    490 			return;
    491 		}
    492 
    493 		cph = (struct vmbus_chanpkt_hdr *)sc->sc_buf;
    494 		switch (cph->cph_type) {
    495 		case VMBUS_CHANPKT_TYPE_INBAND:
    496 			hdr = VMBUS_CHANPKT_CONST_DATA(cph);
    497 			if (rlen < sizeof(*hdr)) {
    498 				device_printf(sc->sc_dev, "Illegal packet\n");
    499 				continue;
    500 			}
    501 
    502 			switch (hdr->type) {
    503 			case HVKBD_PROTO_RESPONSE:
    504 				if (!sc->sc_connected) {
    505 					rsp = VMBUS_CHANPKT_CONST_DATA(cph);
    506 					if (rlen < sizeof(*rsp)) {
    507 						device_printf(sc->sc_dev,
    508 						    "Illegal resp packet\n");
    509 						break;
    510 					}
    511 					sc->sc_connect_status = rsp->status;
    512 					sc->sc_connected = 1;
    513 					wakeup(sc);
    514 				}
    515 				break;
    516 
    517 			case HVKBD_PROTO_EVENT:
    518 				if (sc->sc_wskbddev == NULL || !sc->sc_enabled)
    519 					break;
    520 
    521 				ks = VMBUS_CHANPKT_CONST_DATA(cph);
    522 				hvkbd_keybuf_add_keystroke(sc, &ks->ks);
    523 				if (sc->sc_polling)
    524 					break;
    525 
    526 #if defined(WSDISPLAY_COMPAT_RAWKBD)
    527 				if (sc->sc_rawkbd) {
    528 					u_char buf[2];
    529 					int len;
    530 
    531 					len = sizeof(buf);
    532 					if (hvkbd_encode(sc, buf, &len)) {
    533 						wskbd_rawinput(sc->sc_wskbddev,
    534 						    buf, len);
    535 					}
    536 					break;
    537 				}
    538 #endif
    539 				if (hvkbd_decode(sc, &type, &key))
    540 					wskbd_input(sc->sc_wskbddev, type, key);
    541 				break;
    542 
    543 			case HVKBD_PROTO_REQUEST:
    544 			case HVKBD_PROTO_LED_INDICATORS:
    545 				device_printf(sc->sc_dev,
    546 				    "unhandled message: %d\n", hdr->type);
    547 				break;
    548 
    549 			default:
    550 				device_printf(sc->sc_dev,
    551 				    "unknown message: %d\n", hdr->type);
    552 				break;
    553 			}
    554 			break;
    555 
    556 		case VMBUS_CHANPKT_TYPE_COMP:
    557 		case VMBUS_CHANPKT_TYPE_RXBUF:
    558 			device_printf(sc->sc_dev, "unhandled event: %d\n",
    559 			    cph->cph_type);
    560 			break;
    561 
    562 		default:
    563 			device_printf(sc->sc_dev, "unknown event: %d\n",
    564 			    cph->cph_type);
    565 			break;
    566 		}
    567 	}
    568 }
    569 
    570 int
    571 hvkbd_cnattach(void)
    572 {
    573 
    574 	hvkbd_is_console = 1;
    575 
    576 	return 0;
    577 }
    578 
    579 static void
    580 hvkbd_cngetc(void *v, u_int *type, int *data)
    581 {
    582 	struct hvkbd_softc *sc = v;
    583 
    584 	while (!hvkbd_decode(sc, type, data))
    585 		hvkbd_intr(sc);
    586 }
    587 
    588 static void
    589 hvkbd_cnpollc(void *v, int on)
    590 {
    591 	struct hvkbd_softc *sc = v;
    592 
    593 	sc->sc_polling = on;
    594 }
    595 
    596 MODULE(MODULE_CLASS_DRIVER, hvkbd, "vmbus");
    597 
    598 #ifdef _MODULE
    599 #include "ioconf.c"
    600 #endif
    601 
    602 static int
    603 hvkbd_modcmd(modcmd_t cmd, void *aux)
    604 {
    605 	int error = 0;
    606 
    607 	switch (cmd) {
    608 	case MODULE_CMD_INIT:
    609 #ifdef _MODULE
    610 		error = config_init_component(cfdriver_ioconf_hvkbd,
    611 		    cfattach_ioconf_hvkbd, cfdata_ioconf_hvkbd);
    612 #endif
    613 		break;
    614 
    615 	case MODULE_CMD_FINI:
    616 #ifdef _MODULE
    617 		error = config_fini_component(cfdriver_ioconf_hvtkbd,
    618 		    cfattach_ioconf_hvkbd, cfdata_ioconf_hvkbd);
    619 #endif
    620 		break;
    621 
    622 	case MODULE_CMD_AUTOUNLOAD:
    623 		error = EBUSY;
    624 		break;
    625 
    626 	default:
    627 		error = ENOTTY;
    628 		break;
    629 	}
    630 
    631 	return error;
    632 }
    633