[deliverable/linux.git] / drivers / input / xen-kbdfront.c

/*
 * Xen para-virtual input device
 *
 * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
 * Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
 *
 *  Based on linux/drivers/input/mouse/sermouse.c
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License. See the file COPYING in the main directory of this archive for
 *  more details.
 */

/*
 * TODO:
 *
 * Switch to grant tables together with xen-fbfront.c.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/input.h>

#include <asm/xen/hypervisor.h>

#include <xen/xen.h>
#include <xen/events.h>
#include <xen/page.h>
#include <xen/interface/io/fbif.h>
#include <xen/interface/io/kbdif.h>
#include <xen/xenbus.h>

struct xenkbd_info {
	struct input_dev *kbd;
	struct input_dev *ptr;
	struct xenkbd_page *page;
	int irq;
	struct xenbus_device *xbdev;
	char phys[32];
};

static int xenkbd_remove(struct xenbus_device *);
static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *);
static void xenkbd_disconnect_backend(struct xenkbd_info *);

/*
 * Note: if you need to send out events, see xenfb_do_update() for how
 * to do that.
 */

static irqreturn_t input_handler(int rq, void *dev_id)
{
	struct xenkbd_info *info = dev_id;
	struct xenkbd_page *page = info->page;
	__u32 cons, prod;

	prod = page->in_prod;
	if (prod == page->in_cons)
		return IRQ_HANDLED;
	rmb();			/* ensure we see ring contents up to prod */
	for (cons = page->in_cons; cons != prod; cons++) {
		union xenkbd_in_event *event;
		struct input_dev *dev;
		event = &XENKBD_IN_RING_REF(page, cons);

		dev = info->ptr;
		switch (event->type) {
		case XENKBD_TYPE_MOTION:
			input_report_rel(dev, REL_X, event->motion.rel_x);
			input_report_rel(dev, REL_Y, event->motion.rel_y);
			if (event->motion.rel_z)
				input_report_rel(dev, REL_WHEEL,
						 -event->motion.rel_z);
			break;
		case XENKBD_TYPE_KEY:
			dev = NULL;
			if (test_bit(event->key.keycode, info->kbd->keybit))
				dev = info->kbd;
			if (test_bit(event->key.keycode, info->ptr->keybit))
				dev = info->ptr;
			if (dev)
				input_report_key(dev, event->key.keycode,
						 event->key.pressed);
			else
				printk(KERN_WARNING
				       "xenkbd: unhandled keycode 0x%x\n",
				       event->key.keycode);
			break;
		case XENKBD_TYPE_POS:
			input_report_abs(dev, ABS_X, event->pos.abs_x);
			input_report_abs(dev, ABS_Y, event->pos.abs_y);
			if (event->pos.rel_z)
				input_report_rel(dev, REL_WHEEL,
						 -event->pos.rel_z);
			break;
		}
		if (dev)
			input_sync(dev);
	}
	mb();			/* ensure we got ring contents */
	page->in_cons = cons;
	notify_remote_via_irq(info->irq);

	return IRQ_HANDLED;
}

static int __devinit xenkbd_probe(struct xenbus_device *dev,
				  const struct xenbus_device_id *id)
{
	int ret, i;
	struct xenkbd_info *info;
	struct input_dev *kbd, *ptr;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
		return -ENOMEM;
	}
	dev_set_drvdata(&dev->dev, info);
	info->xbdev = dev;
	info->irq = -1;
	snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);

	info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
	if (!info->page)
		goto error_nomem;

	/* keyboard */
	kbd = input_allocate_device();
	if (!kbd)
		goto error_nomem;
	kbd->name = "Xen Virtual Keyboard";
	kbd->phys = info->phys;
	kbd->id.bustype = BUS_PCI;
	kbd->id.vendor = 0x5853;
	kbd->id.product = 0xffff;
	kbd->evbit[0] = BIT(EV_KEY);
	for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
		set_bit(i, kbd->keybit);
	for (i = KEY_OK; i < KEY_MAX; i++)
		set_bit(i, kbd->keybit);

	ret = input_register_device(kbd);
	if (ret) {
		input_free_device(kbd);
		xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
		goto error;
	}
	info->kbd = kbd;

	/* pointing device */
	ptr = input_allocate_device();
	if (!ptr)
		goto error_nomem;
	ptr->name = "Xen Virtual Pointer";
	ptr->phys = info->phys;
	ptr->id.bustype = BUS_PCI;
	ptr->id.vendor = 0x5853;
	ptr->id.product = 0xfffe;
	ptr->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS);
	for (i = BTN_LEFT; i <= BTN_TASK; i++)
		set_bit(i, ptr->keybit);
	ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y) | BIT(REL_WHEEL);
	input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
	input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);

	ret = input_register_device(ptr);
	if (ret) {
		input_free_device(ptr);
		xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
		goto error;
	}
	info->ptr = ptr;

	ret = xenkbd_connect_backend(dev, info);
	if (ret < 0)
		goto error;

	return 0;

 error_nomem:
	ret = -ENOMEM;
	xenbus_dev_fatal(dev, ret, "allocating device memory");
 error:
	xenkbd_remove(dev);
	return ret;
}

static int xenkbd_resume(struct xenbus_device *dev)
{
	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);

	xenkbd_disconnect_backend(info);
	memset(info->page, 0, PAGE_SIZE);
	return xenkbd_connect_backend(dev, info);
}

static int xenkbd_remove(struct xenbus_device *dev)
{
	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);

	xenkbd_disconnect_backend(info);
	if (info->kbd)
		input_unregister_device(info->kbd);
	if (info->ptr)
		input_unregister_device(info->ptr);
	free_page((unsigned long)info->page);
	kfree(info);
	return 0;
}

static int xenkbd_connect_backend(struct xenbus_device *dev,
				  struct xenkbd_info *info)
{
	int ret, evtchn;
	struct xenbus_transaction xbt;

	ret = xenbus_alloc_evtchn(dev, &evtchn);
	if (ret)
		return ret;
	ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
					0, dev->devicetype, info);
	if (ret < 0) {
		xenbus_free_evtchn(dev, evtchn);
		xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
		return ret;
	}
	info->irq = ret;

 again:
	ret = xenbus_transaction_start(&xbt);
	if (ret) {
		xenbus_dev_fatal(dev, ret, "starting transaction");
		return ret;
	}
	ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
			    virt_to_mfn(info->page));
	if (ret)
		goto error_xenbus;
	ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
			    evtchn);
	if (ret)
		goto error_xenbus;
	ret = xenbus_transaction_end(xbt, 0);
	if (ret) {
		if (ret == -EAGAIN)
			goto again;
		xenbus_dev_fatal(dev, ret, "completing transaction");
		return ret;
	}

	xenbus_switch_state(dev, XenbusStateInitialised);
	return 0;

 error_xenbus:
	xenbus_transaction_end(xbt, 1);
	xenbus_dev_fatal(dev, ret, "writing xenstore");
	return ret;
}

static void xenkbd_disconnect_backend(struct xenkbd_info *info)
{
	if (info->irq >= 0)
		unbind_from_irqhandler(info->irq, info);
	info->irq = -1;
}

static void xenkbd_backend_changed(struct xenbus_device *dev,
				   enum xenbus_state backend_state)
{
	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
	int ret, val;

	switch (backend_state) {
	case XenbusStateInitialising:
	case XenbusStateInitialised:
	case XenbusStateUnknown:
	case XenbusStateClosed:
		break;

	case XenbusStateInitWait:
InitWait:
		ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
				   "feature-abs-pointer", "%d", &val);
		if (ret < 0)
			val = 0;
		if (val) {
			ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
					    "request-abs-pointer", "1");
			if (ret)
				printk(KERN_WARNING
				       "xenkbd: can't request abs-pointer");
		}
		xenbus_switch_state(dev, XenbusStateConnected);
		break;

	case XenbusStateConnected:
		/*
		 * Work around xenbus race condition: If backend goes
		 * through InitWait to Connected fast enough, we can
		 * get Connected twice here.
		 */
		if (dev->state != XenbusStateConnected)
			goto InitWait; /* no InitWait seen yet, fudge it */

		/* Set input abs params to match backend screen res */
		if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
				 "width", "%d", &val) > 0)
			input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);

		if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
				 "height", "%d", &val) > 0)
			input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);

		break;

	case XenbusStateClosing:
		xenbus_frontend_closed(dev);
		break;
	}
}

static const struct xenbus_device_id xenkbd_ids[] = {
	{ "vkbd" },
	{ "" }
};

static struct xenbus_driver xenkbd_driver = {
	.name = "vkbd",
	.owner = THIS_MODULE,
	.ids = xenkbd_ids,
	.probe = xenkbd_probe,
	.remove = xenkbd_remove,
	.resume = xenkbd_resume,
	.otherend_changed = xenkbd_backend_changed,
};

static int __init xenkbd_init(void)
{
	if (!xen_domain())
		return -ENODEV;

	/* Nothing to do if running in dom0. */
	if (xen_initial_domain())
		return -ENODEV;

	return xenbus_register_frontend(&xenkbd_driver);
}

static void __exit xenkbd_cleanup(void)
{
	xenbus_unregister_driver(&xenkbd_driver);
}

module_init(xenkbd_init);
module_exit(xenkbd_cleanup);

MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
MODULE_LICENSE("GPL");
MODULE_ALIAS("xen:vkbd");
Commit	Line	Data
4ee36dc0 MA	1	/*
	2	* Xen para-virtual input device
	3	*
	4	* Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
	5	* Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
	6	*
	7	* Based on linux/drivers/input/mouse/sermouse.c
	8	*
	9	* This file is subject to the terms and conditions of the GNU General Public
	10	* License. See the file COPYING in the main directory of this archive for
	11	* more details.
	12	*/
	13
	14	/*
	15	* TODO:
	16	*
	17	* Switch to grant tables together with xen-fbfront.c.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/errno.h>
	22	#include <linux/module.h>
	23	#include <linux/input.h>
1ccbf534	24
4ee36dc0	25	#include <asm/xen/hypervisor.h>
1ccbf534 JF	26
1ccbf534 JF	27	#include <xen/xen.h>
4ee36dc0 MA	28	#include <xen/events.h>
	29	#include <xen/page.h>
	30	#include <xen/interface/io/fbif.h>
	31	#include <xen/interface/io/kbdif.h>
	32	#include <xen/xenbus.h>
	33
	34	struct xenkbd_info {
	35	struct input_dev *kbd;
	36	struct input_dev *ptr;
	37	struct xenkbd_page *page;
	38	int irq;
	39	struct xenbus_device *xbdev;
	40	char phys[32];
	41	};
	42
	43	static int xenkbd_remove(struct xenbus_device *);
	44	static int xenkbd_connect_backend(struct xenbus_device , struct xenkbd_info );
	45	static void xenkbd_disconnect_backend(struct xenkbd_info *);
	46
	47	/*
	48	* Note: if you need to send out events, see xenfb_do_update() for how
	49	* to do that.
	50	*/
	51
	52	static irqreturn_t input_handler(int rq, void *dev_id)
	53	{
	54	struct xenkbd_info *info = dev_id;
	55	struct xenkbd_page *page = info->page;
	56	__u32 cons, prod;
	57
	58	prod = page->in_prod;
	59	if (prod == page->in_cons)
	60	return IRQ_HANDLED;
	61	rmb(); /* ensure we see ring contents up to prod */
	62	for (cons = page->in_cons; cons != prod; cons++) {
	63	union xenkbd_in_event *event;
	64	struct input_dev *dev;
	65	event = &XENKBD_IN_RING_REF(page, cons);
	66
	67	dev = info->ptr;
	68	switch (event->type) {
	69	case XENKBD_TYPE_MOTION:
	70	input_report_rel(dev, REL_X, event->motion.rel_x);
	71	input_report_rel(dev, REL_Y, event->motion.rel_y);
6ba0e7b3 MA	72	if (event->motion.rel_z)
	73	input_report_rel(dev, REL_WHEEL,
	74	-event->motion.rel_z);
4ee36dc0 MA	75	break;
	76	case XENKBD_TYPE_KEY:
	77	dev = NULL;
	78	if (test_bit(event->key.keycode, info->kbd->keybit))
	79	dev = info->kbd;
	80	if (test_bit(event->key.keycode, info->ptr->keybit))
	81	dev = info->ptr;
	82	if (dev)
	83	input_report_key(dev, event->key.keycode,
	84	event->key.pressed);
	85	else
	86	printk(KERN_WARNING
	87	"xenkbd: unhandled keycode 0x%x\n",
	88	event->key.keycode);
	89	break;
	90	case XENKBD_TYPE_POS:
	91	input_report_abs(dev, ABS_X, event->pos.abs_x);
	92	input_report_abs(dev, ABS_Y, event->pos.abs_y);
6ba0e7b3 MA	93	if (event->pos.rel_z)
	94	input_report_rel(dev, REL_WHEEL,
	95	-event->pos.rel_z);
4ee36dc0 MA	96	break;
	97	}
	98	if (dev)
	99	input_sync(dev);
	100	}
	101	mb(); /* ensure we got ring contents */
	102	page->in_cons = cons;
	103	notify_remote_via_irq(info->irq);
	104
	105	return IRQ_HANDLED;
	106	}
	107
	108	static int __devinit xenkbd_probe(struct xenbus_device *dev,
	109	const struct xenbus_device_id *id)
	110	{
	111	int ret, i;
	112	struct xenkbd_info *info;
	113	struct input_dev kbd, ptr;
	114
	115	info = kzalloc(sizeof(*info), GFP_KERNEL);
	116	if (!info) {
	117	xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
	118	return -ENOMEM;
	119	}
1b713e00	120	dev_set_drvdata(&dev->dev, info);
4ee36dc0 MA	121	info->xbdev = dev;
	122	info->irq = -1;
	123	snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
	124
	125	info->page = (void *)__get_free_page(GFP_KERNEL \| __GFP_ZERO);
	126	if (!info->page)
	127	goto error_nomem;
	128
	129	/* keyboard */
	130	kbd = input_allocate_device();
	131	if (!kbd)
	132	goto error_nomem;
	133	kbd->name = "Xen Virtual Keyboard";
	134	kbd->phys = info->phys;
	135	kbd->id.bustype = BUS_PCI;
	136	kbd->id.vendor = 0x5853;
	137	kbd->id.product = 0xffff;
	138	kbd->evbit[0] = BIT(EV_KEY);
	139	for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
	140	set_bit(i, kbd->keybit);
	141	for (i = KEY_OK; i < KEY_MAX; i++)
	142	set_bit(i, kbd->keybit);
	143
	144	ret = input_register_device(kbd);
	145	if (ret) {
	146	input_free_device(kbd);
	147	xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
	148	goto error;
	149	}
	150	info->kbd = kbd;
	151
	152	/* pointing device */
	153	ptr = input_allocate_device();
	154	if (!ptr)
	155	goto error_nomem;
	156	ptr->name = "Xen Virtual Pointer";
	157	ptr->phys = info->phys;
	158	ptr->id.bustype = BUS_PCI;
	159	ptr->id.vendor = 0x5853;
	160	ptr->id.product = 0xfffe;
	161	ptr->evbit[0] = BIT(EV_KEY) \| BIT(EV_REL) \| BIT(EV_ABS);
	162	for (i = BTN_LEFT; i <= BTN_TASK; i++)
	163	set_bit(i, ptr->keybit);
6ba0e7b3	164	ptr->relbit[0] = BIT(REL_X) \| BIT(REL_Y) \| BIT(REL_WHEEL);
4ee36dc0 MA	165	input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
	166	input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
	167
	168	ret = input_register_device(ptr);
	169	if (ret) {
	170	input_free_device(ptr);
	171	xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
	172	goto error;
	173	}
	174	info->ptr = ptr;
	175
	176	ret = xenkbd_connect_backend(dev, info);
	177	if (ret < 0)
	178	goto error;
	179
	180	return 0;
	181
	182	error_nomem:
	183	ret = -ENOMEM;
	184	xenbus_dev_fatal(dev, ret, "allocating device memory");
	185	error:
	186	xenkbd_remove(dev);
	187	return ret;
	188	}
	189
	190	static int xenkbd_resume(struct xenbus_device *dev)
	191	{
1b713e00	192	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
4ee36dc0 MA	193
	194	xenkbd_disconnect_backend(info);
	195	memset(info->page, 0, PAGE_SIZE);
	196	return xenkbd_connect_backend(dev, info);
	197	}
	198
	199	static int xenkbd_remove(struct xenbus_device *dev)
	200	{
1b713e00	201	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
4ee36dc0 MA	202
	203	xenkbd_disconnect_backend(info);
	204	if (info->kbd)
	205	input_unregister_device(info->kbd);
	206	if (info->ptr)
	207	input_unregister_device(info->ptr);
	208	free_page((unsigned long)info->page);
	209	kfree(info);
	210	return 0;
	211	}
	212
	213	static int xenkbd_connect_backend(struct xenbus_device *dev,
	214	struct xenkbd_info *info)
	215	{
	216	int ret, evtchn;
	217	struct xenbus_transaction xbt;
	218
	219	ret = xenbus_alloc_evtchn(dev, &evtchn);
	220	if (ret)
	221	return ret;
	222	ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
	223	0, dev->devicetype, info);
	224	if (ret < 0) {
	225	xenbus_free_evtchn(dev, evtchn);
	226	xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
	227	return ret;
	228	}
	229	info->irq = ret;
	230
	231	again:
	232	ret = xenbus_transaction_start(&xbt);
	233	if (ret) {
	234	xenbus_dev_fatal(dev, ret, "starting transaction");
	235	return ret;
	236	}
	237	ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
	238	virt_to_mfn(info->page));
	239	if (ret)
	240	goto error_xenbus;
	241	ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
	242	evtchn);
	243	if (ret)
	244	goto error_xenbus;
	245	ret = xenbus_transaction_end(xbt, 0);
	246	if (ret) {
	247	if (ret == -EAGAIN)
	248	goto again;
	249	xenbus_dev_fatal(dev, ret, "completing transaction");
	250	return ret;
	251	}
	252
	253	xenbus_switch_state(dev, XenbusStateInitialised);
	254	return 0;
	255
	256	error_xenbus:
	257	xenbus_transaction_end(xbt, 1);
	258	xenbus_dev_fatal(dev, ret, "writing xenstore");
	259	return ret;
	260	}
	261
	262	static void xenkbd_disconnect_backend(struct xenkbd_info *info)
	263	{
	264	if (info->irq >= 0)
	265	unbind_from_irqhandler(info->irq, info);
266	info->irq = -1;
267	}
268
269	static void xenkbd_backend_changed(struct xenbus_device *dev,
270	enum xenbus_state backend_state)
271	{
1b713e00	272	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
4ee36dc0 MA	273	int ret, val;
	274
	275	switch (backend_state) {
	276	case XenbusStateInitialising:
	277	case XenbusStateInitialised:
	278	case XenbusStateUnknown:
	279	case XenbusStateClosed:
	280	break;
	281
	282	case XenbusStateInitWait:
	283	InitWait:
	284	ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
	285	"feature-abs-pointer", "%d", &val);
	286	if (ret < 0)
	287	val = 0;
	288	if (val) {
	289	ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
	290	"request-abs-pointer", "1");
	291	if (ret)
	292	printk(KERN_WARNING
	293	"xenkbd: can't request abs-pointer");
	294	}
	295	xenbus_switch_state(dev, XenbusStateConnected);
	296	break;
	297
	298	case XenbusStateConnected:
	299	/*
	300	* Work around xenbus race condition: If backend goes
	301	* through InitWait to Connected fast enough, we can
	302	* get Connected twice here.
	303	*/
	304	if (dev->state != XenbusStateConnected)
	305	goto InitWait; /* no InitWait seen yet, fudge it */
e4dcff1f MA	306
	307	/* Set input abs params to match backend screen res */
	308	if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
	309	"width", "%d", &val) > 0)
	310	input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
	311
	312	if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
	313	"height", "%d", &val) > 0)
	314	input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
	315
4ee36dc0 MA	316	break;
	317
	318	case XenbusStateClosing:
	319	xenbus_frontend_closed(dev);
	320	break;
	321	}
	322	}
	323
c6d57093	324	static const struct xenbus_device_id xenkbd_ids[] = {
4ee36dc0 MA	325	{ "vkbd" },
	326	{ "" }
	327	};
	328
ffb78a26	329	static struct xenbus_driver xenkbd_driver = {
4ee36dc0 MA	330	.name = "vkbd",
	331	.owner = THIS_MODULE,
	332	.ids = xenkbd_ids,
	333	.probe = xenkbd_probe,
	334	.remove = xenkbd_remove,
	335	.resume = xenkbd_resume,
	336	.otherend_changed = xenkbd_backend_changed,
	337	};
	338
	339	static int __init xenkbd_init(void)
	340	{
6e833587	341	if (!xen_domain())
4ee36dc0 MA	342	return -ENODEV;
	343
	344	/* Nothing to do if running in dom0. */
6e833587	345	if (xen_initial_domain())
4ee36dc0 MA	346	return -ENODEV;
4ee36dc0 MA	347
ffb78a26	348	return xenbus_register_frontend(&xenkbd_driver);
4ee36dc0 MA	349	}
	350
	351	static void __exit xenkbd_cleanup(void)
	352	{
ffb78a26	353	xenbus_unregister_driver(&xenkbd_driver);
4ee36dc0 MA	354	}
	355
	356	module_init(xenkbd_init);
	357	module_exit(xenkbd_cleanup);
	358
1e892c95	359	MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
4ee36dc0	360	MODULE_LICENSE("GPL");
1e892c95	361	MODULE_ALIAS("xen:vkbd");