2 * Xen para-virtual input device
4 * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
5 * Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
7 * Based on linux/drivers/input/mouse/sermouse.c
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
17 * Switch to grant tables together with xen-fbfront.c.
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>
27 #include <xen/interface/io/fbif.h>
28 #include <xen/interface/io/kbdif.h>
29 #include <xen/xenbus.h>
32 struct input_dev *kbd;
33 struct input_dev *ptr;
34 struct xenkbd_page *page;
36 struct xenbus_device *xbdev;
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 *);
45 * Note: if you need to send out events, see xenfb_do_update() for how
49 static irqreturn_t input_handler(int rq, void *dev_id)
51 struct xenkbd_info *info = dev_id;
52 struct xenkbd_page *page = info->page;
56 if (prod == page->in_cons)
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);
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 if (event->motion.rel_z)
70 input_report_rel(dev, REL_WHEEL,
71 -event->motion.rel_z);
75 if (test_bit(event->key.keycode, info->kbd->keybit))
77 if (test_bit(event->key.keycode, info->ptr->keybit))
80 input_report_key(dev, event->key.keycode,
84 "xenkbd: unhandled keycode 0x%x\n",
88 input_report_abs(dev, ABS_X, event->pos.abs_x);
89 input_report_abs(dev, ABS_Y, event->pos.abs_y);
91 input_report_rel(dev, REL_WHEEL,
98 mb(); /* ensure we got ring contents */
100 notify_remote_via_irq(info->irq);
105 static int __devinit xenkbd_probe(struct xenbus_device *dev,
106 const struct xenbus_device_id *id)
109 struct xenkbd_info *info;
110 struct input_dev *kbd, *ptr;
112 info = kzalloc(sizeof(*info), GFP_KERNEL);
114 xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
117 dev_set_drvdata(&dev->dev, info);
120 snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
122 info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
126 if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0)
129 xenbus_printf(XBT_NIL, dev->nodename, "request-abs-pointer", "1");
132 kbd = input_allocate_device();
135 kbd->name = "Xen Virtual Keyboard";
136 kbd->phys = info->phys;
137 kbd->id.bustype = BUS_PCI;
138 kbd->id.vendor = 0x5853;
139 kbd->id.product = 0xffff;
141 __set_bit(EV_KEY, kbd->evbit);
142 for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
143 __set_bit(i, kbd->keybit);
144 for (i = KEY_OK; i < KEY_MAX; i++)
145 __set_bit(i, kbd->keybit);
147 ret = input_register_device(kbd);
149 input_free_device(kbd);
150 xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
155 /* pointing device */
156 ptr = input_allocate_device();
159 ptr->name = "Xen Virtual Pointer";
160 ptr->phys = info->phys;
161 ptr->id.bustype = BUS_PCI;
162 ptr->id.vendor = 0x5853;
163 ptr->id.product = 0xfffe;
166 __set_bit(EV_ABS, ptr->evbit);
167 input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
168 input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
170 input_set_capability(ptr, EV_REL, REL_X);
171 input_set_capability(ptr, EV_REL, REL_Y);
173 input_set_capability(ptr, EV_REL, REL_WHEEL);
175 __set_bit(EV_KEY, ptr->evbit);
176 for (i = BTN_LEFT; i <= BTN_TASK; i++)
177 __set_bit(i, ptr->keybit);
179 ret = input_register_device(ptr);
181 input_free_device(ptr);
182 xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
187 ret = xenkbd_connect_backend(dev, info);
195 xenbus_dev_fatal(dev, ret, "allocating device memory");
201 static int xenkbd_resume(struct xenbus_device *dev)
203 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
205 xenkbd_disconnect_backend(info);
206 memset(info->page, 0, PAGE_SIZE);
207 return xenkbd_connect_backend(dev, info);
210 static int xenkbd_remove(struct xenbus_device *dev)
212 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
214 xenkbd_disconnect_backend(info);
216 input_unregister_device(info->kbd);
218 input_unregister_device(info->ptr);
219 free_page((unsigned long)info->page);
224 static int xenkbd_connect_backend(struct xenbus_device *dev,
225 struct xenkbd_info *info)
228 struct xenbus_transaction xbt;
230 ret = xenbus_alloc_evtchn(dev, &evtchn);
233 ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
234 0, dev->devicetype, info);
236 xenbus_free_evtchn(dev, evtchn);
237 xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
243 ret = xenbus_transaction_start(&xbt);
245 xenbus_dev_fatal(dev, ret, "starting transaction");
248 ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
249 virt_to_mfn(info->page));
252 ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
256 ret = xenbus_transaction_end(xbt, 0);
260 xenbus_dev_fatal(dev, ret, "completing transaction");
264 xenbus_switch_state(dev, XenbusStateInitialised);
268 xenbus_transaction_end(xbt, 1);
269 xenbus_dev_fatal(dev, ret, "writing xenstore");
273 static void xenkbd_disconnect_backend(struct xenkbd_info *info)
276 unbind_from_irqhandler(info->irq, info);
280 static void xenkbd_backend_changed(struct xenbus_device *dev,
281 enum xenbus_state backend_state)
283 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
286 switch (backend_state) {
287 case XenbusStateInitialising:
288 case XenbusStateInitialised:
289 case XenbusStateUnknown:
290 case XenbusStateClosed:
293 case XenbusStateInitWait:
295 ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
296 "feature-abs-pointer", "%d", &val);
300 ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
301 "request-abs-pointer", "1");
303 pr_warning("can't request abs-pointer\n");
305 xenbus_switch_state(dev, XenbusStateConnected);
308 case XenbusStateConnected:
310 * Work around xenbus race condition: If backend goes
311 * through InitWait to Connected fast enough, we can
312 * get Connected twice here.
314 if (dev->state != XenbusStateConnected)
315 goto InitWait; /* no InitWait seen yet, fudge it */
317 /* Set input abs params to match backend screen res */
318 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
319 "width", "%d", &val) > 0)
320 input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
322 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
323 "height", "%d", &val) > 0)
324 input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
328 case XenbusStateClosing:
329 xenbus_frontend_closed(dev);
334 static struct xenbus_device_id xenkbd_ids[] = {
339 static struct xenbus_driver xenkbd_driver = {
341 .owner = THIS_MODULE,
343 .probe = xenkbd_probe,
344 .remove = xenkbd_remove,
345 .resume = xenkbd_resume,
346 .otherend_changed = xenkbd_backend_changed,
349 static int __init xenkbd_init(void)
354 /* Nothing to do if running in dom0. */
355 if (xen_initial_domain())
358 return xenbus_register_frontend(&xenkbd_driver);
361 static void __exit xenkbd_cleanup(void)
363 xenbus_unregister_driver(&xenkbd_driver);
366 module_init(xenkbd_init);
367 module_exit(xenkbd_cleanup);
369 MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
370 MODULE_LICENSE("GPL");
371 MODULE_ALIAS("xen:vkbd");