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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
31struct 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
40static int xenkbd_remove(struct xenbus_device *);
41static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *);
42static void xenkbd_disconnect_backend(struct xenkbd_info *);
43
44
45
46
47
48
49static 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();
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 if (event->motion.rel_z)
70 input_report_rel(dev, REL_WHEEL,
71 -event->motion.rel_z);
72 break;
73 case XENKBD_TYPE_KEY:
74 dev = NULL;
75 if (test_bit(event->key.keycode, info->kbd->keybit))
76 dev = info->kbd;
77 if (test_bit(event->key.keycode, info->ptr->keybit))
78 dev = info->ptr;
79 if (dev)
80 input_report_key(dev, event->key.keycode,
81 event->key.pressed);
82 else
83 printk(KERN_WARNING
84 "xenkbd: unhandled keycode 0x%x\n",
85 event->key.keycode);
86 break;
87 case XENKBD_TYPE_POS:
88 input_report_abs(dev, ABS_X, event->pos.abs_x);
89 input_report_abs(dev, ABS_Y, event->pos.abs_y);
90 if (event->pos.rel_z)
91 input_report_rel(dev, REL_WHEEL,
92 -event->pos.rel_z);
93 break;
94 }
95 if (dev)
96 input_sync(dev);
97 }
98 mb();
99 page->in_cons = cons;
100 notify_remote_via_irq(info->irq);
101
102 return IRQ_HANDLED;
103}
104
105static int __devinit xenkbd_probe(struct xenbus_device *dev,
106 const struct xenbus_device_id *id)
107{
108 int ret, i;
109 struct xenkbd_info *info;
110 struct input_dev *kbd, *ptr;
111
112 info = kzalloc(sizeof(*info), GFP_KERNEL);
113 if (!info) {
114 xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
115 return -ENOMEM;
116 }
117 dev_set_drvdata(&dev->dev, info);
118 info->xbdev = dev;
119 info->irq = -1;
120 snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
121
122 info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
123 if (!info->page)
124 goto error_nomem;
125
126
127 kbd = input_allocate_device();
128 if (!kbd)
129 goto error_nomem;
130 kbd->name = "Xen Virtual Keyboard";
131 kbd->phys = info->phys;
132 kbd->id.bustype = BUS_PCI;
133 kbd->id.vendor = 0x5853;
134 kbd->id.product = 0xffff;
135 kbd->evbit[0] = BIT(EV_KEY);
136 for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
137 set_bit(i, kbd->keybit);
138 for (i = KEY_OK; i < KEY_MAX; i++)
139 set_bit(i, kbd->keybit);
140
141 ret = input_register_device(kbd);
142 if (ret) {
143 input_free_device(kbd);
144 xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
145 goto error;
146 }
147 info->kbd = kbd;
148
149
150 ptr = input_allocate_device();
151 if (!ptr)
152 goto error_nomem;
153 ptr->name = "Xen Virtual Pointer";
154 ptr->phys = info->phys;
155 ptr->id.bustype = BUS_PCI;
156 ptr->id.vendor = 0x5853;
157 ptr->id.product = 0xfffe;
158 ptr->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS);
159 for (i = BTN_LEFT; i <= BTN_TASK; i++)
160 set_bit(i, ptr->keybit);
161 ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y) | BIT(REL_WHEEL);
162 input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
163 input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
164
165 ret = input_register_device(ptr);
166 if (ret) {
167 input_free_device(ptr);
168 xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
169 goto error;
170 }
171 info->ptr = ptr;
172
173 ret = xenkbd_connect_backend(dev, info);
174 if (ret < 0)
175 goto error;
176
177 return 0;
178
179 error_nomem:
180 ret = -ENOMEM;
181 xenbus_dev_fatal(dev, ret, "allocating device memory");
182 error:
183 xenkbd_remove(dev);
184 return ret;
185}
186
187static int xenkbd_resume(struct xenbus_device *dev)
188{
189 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
190
191 xenkbd_disconnect_backend(info);
192 memset(info->page, 0, PAGE_SIZE);
193 return xenkbd_connect_backend(dev, info);
194}
195
196static int xenkbd_remove(struct xenbus_device *dev)
197{
198 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
199
200 xenkbd_disconnect_backend(info);
201 if (info->kbd)
202 input_unregister_device(info->kbd);
203 if (info->ptr)
204 input_unregister_device(info->ptr);
205 free_page((unsigned long)info->page);
206 kfree(info);
207 return 0;
208}
209
210static int xenkbd_connect_backend(struct xenbus_device *dev,
211 struct xenkbd_info *info)
212{
213 int ret, evtchn;
214 struct xenbus_transaction xbt;
215
216 ret = xenbus_alloc_evtchn(dev, &evtchn);
217 if (ret)
218 return ret;
219 ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
220 0, dev->devicetype, info);
221 if (ret < 0) {
222 xenbus_free_evtchn(dev, evtchn);
223 xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
224 return ret;
225 }
226 info->irq = ret;
227
228 again:
229 ret = xenbus_transaction_start(&xbt);
230 if (ret) {
231 xenbus_dev_fatal(dev, ret, "starting transaction");
232 return ret;
233 }
234 ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
235 virt_to_mfn(info->page));
236 if (ret)
237 goto error_xenbus;
238 ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
239 evtchn);
240 if (ret)
241 goto error_xenbus;
242 ret = xenbus_transaction_end(xbt, 0);
243 if (ret) {
244 if (ret == -EAGAIN)
245 goto again;
246 xenbus_dev_fatal(dev, ret, "completing transaction");
247 return ret;
248 }
249
250 xenbus_switch_state(dev, XenbusStateInitialised);
251 return 0;
252
253 error_xenbus:
254 xenbus_transaction_end(xbt, 1);
255 xenbus_dev_fatal(dev, ret, "writing xenstore");
256 return ret;
257}
258
259static void xenkbd_disconnect_backend(struct xenkbd_info *info)
260{
261 if (info->irq >= 0)
262 unbind_from_irqhandler(info->irq, info);
263 info->irq = -1;
264}
265
266static void xenkbd_backend_changed(struct xenbus_device *dev,
267 enum xenbus_state backend_state)
268{
269 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
270 int ret, val;
271
272 switch (backend_state) {
273 case XenbusStateInitialising:
274 case XenbusStateInitialised:
275 case XenbusStateUnknown:
276 case XenbusStateClosed:
277 break;
278
279 case XenbusStateInitWait:
280InitWait:
281 ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
282 "feature-abs-pointer", "%d", &val);
283 if (ret < 0)
284 val = 0;
285 if (val) {
286 ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
287 "request-abs-pointer", "1");
288 if (ret)
289 printk(KERN_WARNING
290 "xenkbd: can't request abs-pointer");
291 }
292 xenbus_switch_state(dev, XenbusStateConnected);
293 break;
294
295 case XenbusStateConnected:
296
297
298
299
300
301 if (dev->state != XenbusStateConnected)
302 goto InitWait;
303
304
305 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
306 "width", "%d", &val) > 0)
307 input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
308
309 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
310 "height", "%d", &val) > 0)
311 input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
312
313 break;
314
315 case XenbusStateClosing:
316 xenbus_frontend_closed(dev);
317 break;
318 }
319}
320
321static struct xenbus_device_id xenkbd_ids[] = {
322 { "vkbd" },
323 { "" }
324};
325
326static struct xenbus_driver xenkbd_driver = {
327 .name = "vkbd",
328 .owner = THIS_MODULE,
329 .ids = xenkbd_ids,
330 .probe = xenkbd_probe,
331 .remove = xenkbd_remove,
332 .resume = xenkbd_resume,
333 .otherend_changed = xenkbd_backend_changed,
334};
335
336static int __init xenkbd_init(void)
337{
338 if (!xen_domain())
339 return -ENODEV;
340
341
342 if (xen_initial_domain())
343 return -ENODEV;
344
345 return xenbus_register_frontend(&xenkbd_driver);
346}
347
348static void __exit xenkbd_cleanup(void)
349{
350 xenbus_unregister_driver(&xenkbd_driver);
351}
352
353module_init(xenkbd_init);
354module_exit(xenkbd_cleanup);
355
356MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
357MODULE_LICENSE("GPL");
358MODULE_ALIAS("xen:vkbd");
359
