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hvkbd.c revision 1.1 
      1 /*	$NetBSD: hvkbd.c,v 1.1 2019/05/24 14:28:48 nonaka 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 1.1 2019/05/24 14:28:48 nonaka 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, cold ? KM_NOSLEEP : KM_SLEEP);
    213 	if (sc->sc_buf == NULL) {
    214 		aprint_error_dev(self,
    215 		    "failed to allocate channel data buffer\n");
    216 		return;
    217 	}
    218 
    219 	if (vmbus_channel_setdeferred(sc->sc_chan, device_xname(self))) {
    220 		aprint_error_dev(self,
    221 		    "failed to create the interrupt thread\n");
    222 		goto free_buf;
    223 	}
    224 
    225 	sc->sc_chan->ch_flags &= ~CHF_BATCHED;
    226 	if (vmbus_channel_open(sc->sc_chan,
    227 	    HVKBD_TX_RING_SIZE + HVKBD_RX_RING_SIZE, NULL, 0, hvkbd_intr, sc)) {
    228 		aprint_error_dev(self, "failed to open channel\n");
    229 		goto free_buf;
    230 	}
    231 
    232 	if (hvkbd_connect(sc))
    233 		goto free_buf;
    234 
    235 	if (!pmf_device_register(self, NULL, NULL))
    236 		aprint_error_dev(self, "couldn't establish power handler\n");
    237 
    238 	sc->sc_console_keyboard = hvkbd_is_console;
    239 	if (hvkbd_is_console)
    240 		hvkbd_is_console = 0;
    241 
    242 	if (sc->sc_console_keyboard) {
    243 		wskbd_cnattach(&hvkbd_consops, sc, &hvkbd_keymapdata);
    244 		hvkbd_enable(sc, 1);
    245 	}
    246 
    247 	a.console = sc->sc_console_keyboard;
    248 	a.keymap = &hvkbd_keymapdata;
    249 	a.accessops = &hvkbd_accessops;
    250 	a.accesscookie = sc;
    251 	sc->sc_wskbddev = config_found(self, &a, wskbddevprint);
    252 	return;
    253 
    254 free_buf:
    255 	if (sc->sc_buf != NULL) {
    256 		kmem_free(sc->sc_buf, HVKBD_BUFSIZE);
    257 		sc->sc_buf = NULL;
    258 	}
    259 	hvkbd_free_keybuf(sc);
    260 }
    261 
    262 static int
    263 hvkbd_alloc_keybuf(struct hvkbd_softc *sc)
    264 {
    265 	struct hvkbd_keystroke_info *ksi;
    266 	int i;
    267 
    268 	for (i = 0; i < HVKBD_KEYBUF_SIZE; i++) {
    269 		ksi = kmem_zalloc(sizeof(*ksi), cold ? KM_NOSLEEP : KM_SLEEP);
    270 		if (ksi != NULL) {
    271 			LIST_INSERT_HEAD(&sc->sc_ks_free, ksi, link);
    272 			continue;
    273 		}
    274 
    275 		while ((ksi = LIST_FIRST(&sc->sc_ks_free)) != NULL) {
    276 			LIST_REMOVE(ksi, link);
    277 			kmem_free(ksi, sizeof(*ksi));
    278 		}
    279 		return ENOMEM;
    280 
    281 	}
    282 
    283 	return 0;
    284 }
    285 
    286 static void
    287 hvkbd_free_keybuf(struct hvkbd_softc *sc)
    288 {
    289 	struct hvkbd_keystroke_info *ksi;
    290 
    291 	while ((ksi = STAILQ_FIRST(&sc->sc_ks_queue)) != NULL) {
    292 		STAILQ_REMOVE(&sc->sc_ks_queue, ksi, hvkbd_keystroke_info,
    293 		    slink);
    294 		kmem_free(ksi, sizeof(*ksi));
    295 	}
    296 	while ((ksi = LIST_FIRST(&sc->sc_ks_free)) != NULL) {
    297 		LIST_REMOVE(ksi, link);
    298 		kmem_free(ksi, sizeof(*ksi));
    299 	}
    300 }
    301 
    302 int
    303 hvkbd_enable(void *v, int on)
    304 {
    305 	struct hvkbd_softc *sc = v;
    306 
    307 	sc->sc_enabled = on;
    308 
    309 	return 0;
    310 }
    311 
    312 static void
    313 hvkbd_set_leds(void *v, int leds)
    314 {
    315 }
    316 
    317 static int
    318 hvkbd_ioctl(void *v, u_long cmd, void *data, int flag, struct lwp *l)
    319 {
    320 	struct hvkbd_softc *sc = v;
    321 
    322 	switch (cmd) {
    323 	case WSKBDIO_GTYPE:
    324 		*(int *)data = WSKBD_TYPE_HYPERV;
    325 		return 0;
    326 
    327 	case WSKBDIO_SETLEDS:
    328 		hvkbd_set_leds(v, *(int *)data);
    329 		return 0;
    330 
    331 	case WSKBDIO_GETLEDS:
    332 		*(int *)data = 0;
    333 		return 0;
    334 
    335 #if defined(WSDISPLAY_COMPAT_RAWKBD)
    336 	case WSKBDIO_SETMODE:
    337 		sc->sc_rawkbd = (*(int *)data == WSKBD_RAW);
    338 		return 0;
    339 #endif
    340 	}
    341 
    342 	return EPASSTHROUGH;
    343 }
    344 
    345 static int
    346 hvkbd_connect(struct hvkbd_softc *sc)
    347 {
    348 	struct hvkbd_proto_req req;
    349 	int timo = 100;
    350 	int error, s;
    351 
    352 	sc->sc_connected = 0;
    353 
    354 	memset(&req, 0, sizeof(req));
    355 	req.hdr.type = HVKBD_PROTO_REQUEST;
    356 	req.ver = HVKBD_VERSION;
    357 	error = vmbus_channel_send(sc->sc_chan, &req, sizeof(req),
    358 	    0, VMBUS_CHANPKT_TYPE_INBAND, VMBUS_CHANPKT_FLAG_RC);
    359 	if (error) {
    360 		aprint_error_dev(sc->sc_dev, "failed to send connect: %d\n",
    361 		    error);
    362 		return error;
    363 	}
    364 
    365 	do {
    366 		if (cold)
    367 			delay(1000);
    368 		else
    369 			tsleep(sc, PRIBIO | PCATCH, "hvkbdcon", 1);
    370 		s = spltty();
    371 		hvkbd_intr(sc);
    372 		splx(s);
    373 	} while (--timo > 0 && sc->sc_connected == 0);
    374 
    375 	if (timo == 0 && sc->sc_connected == 0) {
    376 		aprint_error_dev(sc->sc_dev, "connect timed out\n");
    377 		return ETIMEDOUT;
    378 	}
    379 
    380 	if (!(sc->sc_connect_status & RESP_STATUS_ACCEPTED)) {
    381 		aprint_error_dev(sc->sc_dev, "protocol request failed\n");
    382 		return ENODEV;
    383 	}
    384 
    385 	return 0;
    386 }
    387 
    388 static int
    389 hvkbd_keybuf_add_keystroke(struct hvkbd_softc *sc, const struct keystroke *ks)
    390 {
    391 	struct hvkbd_keystroke_info *ksi;
    392 
    393 	mutex_enter(&sc->sc_ks_lock);
    394 	ksi = LIST_FIRST(&sc->sc_ks_free);
    395 	if (ksi != NULL) {
    396 		LIST_REMOVE(ksi, link);
    397 		ksi->ks = *ks;
    398 		STAILQ_INSERT_TAIL(&sc->sc_ks_queue, ksi, slink);
    399 	}
    400 	mutex_exit(&sc->sc_ks_lock);
    401 
    402 	return (ksi != NULL) ? 0 : 1;
    403 }
    404 
    405 static int
    406 hvkbd_decode(struct hvkbd_softc *sc, u_int *type, int *scancode)
    407 {
    408 	struct hvkbd_keystroke_info *ksi;
    409 	struct keystroke ks;
    410 
    411 	mutex_enter(&sc->sc_ks_lock);
    412 	ksi = STAILQ_FIRST(&sc->sc_ks_queue);
    413 	if (ksi != NULL) {
    414 		STAILQ_REMOVE_HEAD(&sc->sc_ks_queue, slink);
    415 		ks = ksi->ks;
    416 		LIST_INSERT_HEAD(&sc->sc_ks_free, ksi, link);
    417 	}
    418 	mutex_exit(&sc->sc_ks_lock);
    419 
    420 	if (ksi == NULL)
    421 		return 0;
    422 
    423 	/*
    424 	 * XXX: Hyper-V host send unicode to VM through 'Type clipboard text',
    425 	 * the mapping from unicode to scancode depends on the keymap.
    426 	 * It is so complicated that we do not plan to support it yet.
    427 	 */
    428 	if (ks.info & KS_INFO_UNICODE)
    429 		return 0;
    430 
    431 	*type = (ks.info & KS_INFO_BREAK) ?
    432 	    WSCONS_EVENT_KEY_UP : WSCONS_EVENT_KEY_DOWN;
    433 	*scancode = ks.makecode;
    434 	return 1;
    435 }
    436 
    437 static int
    438 hvkbd_encode(struct hvkbd_softc *sc, u_char *buf, int *len)
    439 {
    440 	struct hvkbd_keystroke_info *ksi;
    441 	struct keystroke ks;
    442 	int i;
    443 
    444 	mutex_enter(&sc->sc_ks_lock);
    445 	ksi = STAILQ_FIRST(&sc->sc_ks_queue);
    446 	if (ksi != NULL) {
    447 		STAILQ_REMOVE_HEAD(&sc->sc_ks_queue, slink);
    448 		ks = ksi->ks;
    449 		LIST_INSERT_HEAD(&sc->sc_ks_free, ksi, link);
    450 	}
    451 	mutex_exit(&sc->sc_ks_lock);
    452 
    453 	if (ksi == NULL)
    454 		return 0;
    455 
    456 	/*
    457 	 * XXX: Hyper-V host send unicode to VM through 'Type clipboard text',
    458 	 * the mapping from unicode to scancode depends on the keymap.
    459 	 * It is so complicated that we do not plan to support it yet.
    460 	 */
    461 	if (ks.info & KS_INFO_UNICODE)
    462 		return 0;
    463 
    464 	i = 0;
    465 	if (ks.info & (KS_INFO_E0|KS_INFO_E1)) {
    466 		if (ks.info & KS_INFO_E0)
    467 			buf[i++] = 0xe0;
    468 		else
    469 			buf[i++] = 0xe1;
    470 	}
    471 	if (ks.info & KS_INFO_BREAK)
    472 		buf[i++] = (u_char)ks.makecode & 0x80;
    473 	else
    474 		buf[i++] = (u_char)ks.makecode;
    475 
    476 	KDASSERT(i <= *len);
    477 	*len = i;
    478 
    479 	return 1;
    480 }
    481 
    482 static void
    483 hvkbd_intr(void *xsc)
    484 {
    485 	struct hvkbd_softc *sc = xsc;
    486 	struct vmbus_chanpkt_hdr *cph;
    487 	const struct hvkbd_msg_hdr *hdr;
    488 	const struct hvkbd_proto_resp *rsp;
    489 	const struct hvkbd_keystroke *ks;
    490 	uint64_t rid;
    491 	uint32_t rlen;
    492 	u_int type;
    493 	int key, error;
    494 
    495 	for (;;) {
    496 		error = vmbus_channel_recv(sc->sc_chan, sc->sc_buf,
    497 		    HVKBD_BUFSIZE, &rlen, &rid, 1);
    498 		if (error != 0 || rlen == 0) {
    499 			if (error != EAGAIN)
    500 				device_printf(sc->sc_dev,
    501 				    "failed to receive a reply packet\n");
    502 			return;
    503 		}
    504 
    505 		cph = (struct vmbus_chanpkt_hdr *)sc->sc_buf;
    506 		switch (cph->cph_type) {
    507 		case VMBUS_CHANPKT_TYPE_INBAND:
    508 			hdr = VMBUS_CHANPKT_CONST_DATA(cph);
    509 			if (rlen < sizeof(*hdr)) {
    510 				device_printf(sc->sc_dev, "Illegal packet\n");
    511 				continue;
    512 			}
    513 
    514 			switch (hdr->type) {
    515 			case HVKBD_PROTO_RESPONSE:
    516 				if (!sc->sc_connected) {
    517 					rsp = VMBUS_CHANPKT_CONST_DATA(cph);
    518 					if (rlen < sizeof(*rsp)) {
    519 						device_printf(sc->sc_dev,
    520 						    "Illegal resp packet\n");
    521 						break;
    522 					}
    523 					sc->sc_connect_status = rsp->status;
    524 					sc->sc_connected = 1;
    525 					wakeup(sc);
    526 				}
    527 				break;
    528 
    529 			case HVKBD_PROTO_EVENT:
    530 				if (sc->sc_wskbddev == NULL || !sc->sc_enabled)
    531 					break;
    532 
    533 				ks = VMBUS_CHANPKT_CONST_DATA(cph);
    534 				hvkbd_keybuf_add_keystroke(sc, &ks->ks);
    535 				if (sc->sc_polling)
    536 					break;
    537 
    538 #if defined(WSDISPLAY_COMPAT_RAWKBD)
    539 				if (sc->sc_rawkbd) {
    540 					u_char buf[2];
    541 					int len;
    542 
    543 					len = sizeof(buf);
    544 					if (hvkbd_encode(sc, buf, &len)) {
    545 						wskbd_rawinput(sc->sc_wskbddev,
    546 						    buf, len);
    547 					}
    548 					break;
    549 				}
    550 #endif
    551 				if (hvkbd_decode(sc, &type, &key))
    552 					wskbd_input(sc->sc_wskbddev, type, key);
    553 				break;
    554 
    555 			case HVKBD_PROTO_REQUEST:
    556 			case HVKBD_PROTO_LED_INDICATORS:
    557 				device_printf(sc->sc_dev,
    558 				    "unhandled message: %d\n", hdr->type);
    559 				break;
    560 
    561 			default:
    562 				device_printf(sc->sc_dev,
    563 				    "unknown message: %d\n", hdr->type);
    564 				break;
    565 			}
    566 			break;
    567 
    568 		case VMBUS_CHANPKT_TYPE_COMP:
    569 		case VMBUS_CHANPKT_TYPE_RXBUF:
    570 			device_printf(sc->sc_dev, "unhandled event: %d\n",
    571 			    cph->cph_type);
    572 			break;
    573 
    574 		default:
    575 			device_printf(sc->sc_dev, "unknown event: %d\n",
    576 			    cph->cph_type);
    577 			break;
    578 		}
    579 	}
    580 }
    581 
    582 int
    583 hvkbd_cnattach(void)
    584 {
    585 
    586 	hvkbd_is_console = 1;
    587 
    588 	return 0;
    589 }
    590 
    591 static void
    592 hvkbd_cngetc(void *v, u_int *type, int *data)
    593 {
    594 	struct hvkbd_softc *sc = v;
    595 
    596 	while (!hvkbd_decode(sc, type, data))
    597 		hvkbd_intr(sc);
    598 }
    599 
    600 static void
    601 hvkbd_cnpollc(void *v, int on)
    602 {
    603 	struct hvkbd_softc *sc = v;
    604 
    605 	sc->sc_polling = on;
    606 }
    607 
    608 MODULE(MODULE_CLASS_DRIVER, hvkbd, "vmbus");
    609 
    610 #ifdef _MODULE
    611 #include "ioconf.c"
    612 #endif
    613 
    614 static int
    615 hvkbd_modcmd(modcmd_t cmd, void *aux)
    616 {
    617 	int error = 0;
    618 
    619 	switch (cmd) {
    620 	case MODULE_CMD_INIT:
    621 #ifdef _MODULE
    622 		error = config_init_component(cfdriver_ioconf_hvkbd,
    623 		    cfattach_ioconf_hvkbd, cfdata_ioconf_hvkbd);
    624 #endif
    625 		break;
    626 
    627 	case MODULE_CMD_FINI:
    628 #ifdef _MODULE
    629 		error = config_fini_component(cfdriver_ioconf_hvtkbd,
    630 		    cfattach_ioconf_hvkbd, cfdata_ioconf_hvkbd);
    631 #endif
    632 		break;
    633 
    634 	case MODULE_CMD_AUTOUNLOAD:
    635 		error = EBUSY;
    636 		break;
    637 
    638 	default:
    639 		error = ENOTTY;
    640 		break;
    641 	}
    642 
    643 	return error;
    644 }
    645