[GitHub/mt8127/android_kernel_alcatel_ttab.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/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);
			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);
			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->dev.driver_data = 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);
	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->dev.driver_data;

	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->dev.driver_data;

	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->dev.driver_data;
	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 */
		break;

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

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

static struct xenbus_driver xenkbd = {
	.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 (!is_running_on_xen())
		return -ENODEV;

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

	return xenbus_register_frontend(&xenkbd);
}

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

module_init(xenkbd_init);
module_exit(xenkbd_cleanup);

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