[net-next-2.6.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 <linux/slab.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 XenbusStateReconfiguring:
	case XenbusStateReconfigured:
	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_pv_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>
5a0e3ad6	24	#include <linux/slab.h>
1ccbf534	25
4ee36dc0	26	#include <asm/xen/hypervisor.h>
1ccbf534 JF	27
1ccbf534 JF	28	#include <xen/xen.h>
4ee36dc0 MA	29	#include <xen/events.h>
	30	#include <xen/page.h>
	31	#include <xen/interface/io/fbif.h>
	32	#include <xen/interface/io/kbdif.h>
	33	#include <xen/xenbus.h>
	34
	35	struct xenkbd_info {
	36	struct input_dev *kbd;
	37	struct input_dev *ptr;
	38	struct xenkbd_page *page;
	39	int irq;
	40	struct xenbus_device *xbdev;
	41	char phys[32];
	42	};
	43
	44	static int xenkbd_remove(struct xenbus_device *);
	45	static int xenkbd_connect_backend(struct xenbus_device , struct xenkbd_info );
	46	static void xenkbd_disconnect_backend(struct xenkbd_info *);
	47
	48	/*
	49	* Note: if you need to send out events, see xenfb_do_update() for how
	50	* to do that.
	51	*/
	52
	53	static irqreturn_t input_handler(int rq, void *dev_id)
	54	{
	55	struct xenkbd_info *info = dev_id;
	56	struct xenkbd_page *page = info->page;
	57	__u32 cons, prod;
	58
	59	prod = page->in_prod;
	60	if (prod == page->in_cons)
	61	return IRQ_HANDLED;
	62	rmb(); /* ensure we see ring contents up to prod */
	63	for (cons = page->in_cons; cons != prod; cons++) {
	64	union xenkbd_in_event *event;
	65	struct input_dev *dev;
	66	event = &XENKBD_IN_RING_REF(page, cons);
	67
	68	dev = info->ptr;
	69	switch (event->type) {
	70	case XENKBD_TYPE_MOTION:
	71	input_report_rel(dev, REL_X, event->motion.rel_x);
	72	input_report_rel(dev, REL_Y, event->motion.rel_y);
6ba0e7b3 MA	73	if (event->motion.rel_z)
	74	input_report_rel(dev, REL_WHEEL,
	75	-event->motion.rel_z);
4ee36dc0 MA	76	break;
	77	case XENKBD_TYPE_KEY:
	78	dev = NULL;
	79	if (test_bit(event->key.keycode, info->kbd->keybit))
	80	dev = info->kbd;
	81	if (test_bit(event->key.keycode, info->ptr->keybit))
	82	dev = info->ptr;
	83	if (dev)
	84	input_report_key(dev, event->key.keycode,
	85	event->key.pressed);
	86	else
	87	printk(KERN_WARNING
	88	"xenkbd: unhandled keycode 0x%x\n",
	89	event->key.keycode);
	90	break;
	91	case XENKBD_TYPE_POS:
	92	input_report_abs(dev, ABS_X, event->pos.abs_x);
	93	input_report_abs(dev, ABS_Y, event->pos.abs_y);
6ba0e7b3 MA	94	if (event->pos.rel_z)
	95	input_report_rel(dev, REL_WHEEL,
	96	-event->pos.rel_z);
4ee36dc0 MA	97	break;
	98	}
	99	if (dev)
	100	input_sync(dev);
	101	}
	102	mb(); /* ensure we got ring contents */
	103	page->in_cons = cons;
	104	notify_remote_via_irq(info->irq);
	105
	106	return IRQ_HANDLED;
	107	}
	108
	109	static int __devinit xenkbd_probe(struct xenbus_device *dev,
	110	const struct xenbus_device_id *id)
	111	{
	112	int ret, i;
	113	struct xenkbd_info *info;
	114	struct input_dev kbd, ptr;
	115
	116	info = kzalloc(sizeof(*info), GFP_KERNEL);
	117	if (!info) {
	118	xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
	119	return -ENOMEM;
	120	}
1b713e00	121	dev_set_drvdata(&dev->dev, info);
4ee36dc0 MA	122	info->xbdev = dev;
	123	info->irq = -1;
	124	snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
	125
	126	info->page = (void *)__get_free_page(GFP_KERNEL \| __GFP_ZERO);
	127	if (!info->page)
	128	goto error_nomem;
	129
	130	/* keyboard */
	131	kbd = input_allocate_device();
	132	if (!kbd)
	133	goto error_nomem;
	134	kbd->name = "Xen Virtual Keyboard";
	135	kbd->phys = info->phys;
	136	kbd->id.bustype = BUS_PCI;
	137	kbd->id.vendor = 0x5853;
	138	kbd->id.product = 0xffff;
	139	kbd->evbit[0] = BIT(EV_KEY);
	140	for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
	141	set_bit(i, kbd->keybit);
	142	for (i = KEY_OK; i < KEY_MAX; i++)
	143	set_bit(i, kbd->keybit);
	144
	145	ret = input_register_device(kbd);
	146	if (ret) {
	147	input_free_device(kbd);
	148	xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
	149	goto error;
	150	}
	151	info->kbd = kbd;
	152
	153	/* pointing device */
	154	ptr = input_allocate_device();
	155	if (!ptr)
	156	goto error_nomem;
	157	ptr->name = "Xen Virtual Pointer";
	158	ptr->phys = info->phys;
	159	ptr->id.bustype = BUS_PCI;
	160	ptr->id.vendor = 0x5853;
	161	ptr->id.product = 0xfffe;
	162	ptr->evbit[0] = BIT(EV_KEY) \| BIT(EV_REL) \| BIT(EV_ABS);
	163	for (i = BTN_LEFT; i <= BTN_TASK; i++)
	164	set_bit(i, ptr->keybit);
6ba0e7b3	165	ptr->relbit[0] = BIT(REL_X) \| BIT(REL_Y) \| BIT(REL_WHEEL);
4ee36dc0 MA	166	input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
	167	input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
	168
	169	ret = input_register_device(ptr);
	170	if (ret) {
	171	input_free_device(ptr);
	172	xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
	173	goto error;
	174	}
	175	info->ptr = ptr;
	176
	177	ret = xenkbd_connect_backend(dev, info);
	178	if (ret < 0)
	179	goto error;
	180
	181	return 0;
	182
	183	error_nomem:
	184	ret = -ENOMEM;
	185	xenbus_dev_fatal(dev, ret, "allocating device memory");
	186	error:
	187	xenkbd_remove(dev);
	188	return ret;
	189	}
	190
	191	static int xenkbd_resume(struct xenbus_device *dev)
	192	{
1b713e00	193	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
4ee36dc0 MA	194
	195	xenkbd_disconnect_backend(info);
	196	memset(info->page, 0, PAGE_SIZE);
	197	return xenkbd_connect_backend(dev, info);
	198	}
	199
	200	static int xenkbd_remove(struct xenbus_device *dev)
	201	{
1b713e00	202	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
4ee36dc0 MA	203
	204	xenkbd_disconnect_backend(info);
	205	if (info->kbd)
	206	input_unregister_device(info->kbd);
	207	if (info->ptr)
	208	input_unregister_device(info->ptr);
	209	free_page((unsigned long)info->page);
	210	kfree(info);
	211	return 0;
	212	}
	213
	214	static int xenkbd_connect_backend(struct xenbus_device *dev,
	215	struct xenkbd_info *info)
	216	{
	217	int ret, evtchn;
	218	struct xenbus_transaction xbt;
	219
	220	ret = xenbus_alloc_evtchn(dev, &evtchn);
	221	if (ret)
	222	return ret;
	223	ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
	224	0, dev->devicetype, info);
	225	if (ret < 0) {
	226	xenbus_free_evtchn(dev, evtchn);
	227	xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
	228	return ret;
	229	}
	230	info->irq = ret;
	231
	232	again:
	233	ret = xenbus_transaction_start(&xbt);
	234	if (ret) {
	235	xenbus_dev_fatal(dev, ret, "starting transaction");
	236	return ret;
	237	}
	238	ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
	239	virt_to_mfn(info->page));
	240	if (ret)
	241	goto error_xenbus;
	242	ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
	243	evtchn);
	244	if (ret)
	245	goto error_xenbus;
	246	ret = xenbus_transaction_end(xbt, 0);
	247	if (ret) {
	248	if (ret == -EAGAIN)
	249	goto again;
	250	xenbus_dev_fatal(dev, ret, "completing transaction");
	251	return ret;
	252	}
	253
	254	xenbus_switch_state(dev, XenbusStateInitialised);
	255	return 0;
	256
	257	error_xenbus:
	258	xenbus_transaction_end(xbt, 1);
	259	xenbus_dev_fatal(dev, ret, "writing xenstore");
	260	return ret;
	261	}
	262
	263	static void xenkbd_disconnect_backend(struct xenkbd_info *info)
	264	{
	265	if (info->irq >= 0)
	266	unbind_from_irqhandler(info->irq, info);
267	info->irq = -1;
268	}
269
270	static void xenkbd_backend_changed(struct xenbus_device *dev,
271	enum xenbus_state backend_state)
272	{
1b713e00	273	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
4ee36dc0 MA	274	int ret, val;
	275
	276	switch (backend_state) {
	277	case XenbusStateInitialising:
	278	case XenbusStateInitialised:
b78c9512 NI	279	case XenbusStateReconfiguring:
b78c9512 NI	280	case XenbusStateReconfigured:
4ee36dc0 MA	281	case XenbusStateUnknown:
	282	case XenbusStateClosed:
	283	break;
	284
	285	case XenbusStateInitWait:
	286	InitWait:
	287	ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
	288	"feature-abs-pointer", "%d", &val);
	289	if (ret < 0)
	290	val = 0;
	291	if (val) {
	292	ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
	293	"request-abs-pointer", "1");
	294	if (ret)
	295	printk(KERN_WARNING
	296	"xenkbd: can't request abs-pointer");
	297	}
	298	xenbus_switch_state(dev, XenbusStateConnected);
	299	break;
	300
	301	case XenbusStateConnected:
	302	/*
	303	* Work around xenbus race condition: If backend goes
	304	* through InitWait to Connected fast enough, we can
	305	* get Connected twice here.
	306	*/
	307	if (dev->state != XenbusStateConnected)
	308	goto InitWait; /* no InitWait seen yet, fudge it */
e4dcff1f MA	309
	310	/* Set input abs params to match backend screen res */
	311	if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
	312	"width", "%d", &val) > 0)
	313	input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
	314
	315	if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
	316	"height", "%d", &val) > 0)
	317	input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
	318
4ee36dc0 MA	319	break;
	320
	321	case XenbusStateClosing:
	322	xenbus_frontend_closed(dev);
	323	break;
	324	}
	325	}
	326
c6d57093	327	static const struct xenbus_device_id xenkbd_ids[] = {
4ee36dc0 MA	328	{ "vkbd" },
	329	{ "" }
	330	};
	331
ffb78a26	332	static struct xenbus_driver xenkbd_driver = {
4ee36dc0 MA	333	.name = "vkbd",
	334	.owner = THIS_MODULE,
	335	.ids = xenkbd_ids,
	336	.probe = xenkbd_probe,
	337	.remove = xenkbd_remove,
	338	.resume = xenkbd_resume,
	339	.otherend_changed = xenkbd_backend_changed,
	340	};
	341
	342	static int __init xenkbd_init(void)
	343	{
bee6ab53	344	if (!xen_pv_domain())
4ee36dc0 MA	345	return -ENODEV;
	346
	347	/* Nothing to do if running in dom0. */
6e833587	348	if (xen_initial_domain())
4ee36dc0 MA	349	return -ENODEV;
4ee36dc0 MA	350
ffb78a26	351	return xenbus_register_frontend(&xenkbd_driver);
4ee36dc0 MA	352	}
	353
	354	static void __exit xenkbd_cleanup(void)
	355	{
ffb78a26	356	xenbus_unregister_driver(&xenkbd_driver);
4ee36dc0 MA	357	}
	358
	359	module_init(xenkbd_init);
	360	module_exit(xenkbd_cleanup);
	361
1e892c95	362	MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
4ee36dc0	363	MODULE_LICENSE("GPL");
1e892c95	364	MODULE_ALIAS("xen:vkbd");