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14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/module.h>
19#include <linux/input.h>
20#include <linux/slab.h>
21
22#include <asm/xen/hypervisor.h>
23
24#include <xen/xen.h>
25#include <xen/events.h>
26#include <xen/page.h>
27#include <xen/grant_table.h>
28#include <xen/interface/grant_table.h>
29#include <xen/interface/io/fbif.h>
30#include <xen/interface/io/kbdif.h>
31#include <xen/xenbus.h>
32#include <xen/platform_pci.h>
33
34struct xenkbd_info {
35 struct input_dev *kbd;
36 struct input_dev *ptr;
37 struct xenkbd_page *page;
38 int gref;
39 int irq;
40 struct xenbus_device *xbdev;
41 char phys[32];
42};
43
44static int xenkbd_remove(struct xenbus_device *);
45static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *);
46static void xenkbd_disconnect_backend(struct xenkbd_info *);
47
48
49
50
51
52
53static 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();
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);
73 if (event->motion.rel_z)
74 input_report_rel(dev, REL_WHEEL,
75 -event->motion.rel_z);
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 pr_warning("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);
93 if (event->pos.rel_z)
94 input_report_rel(dev, REL_WHEEL,
95 -event->pos.rel_z);
96 break;
97 }
98 if (dev)
99 input_sync(dev);
100 }
101 mb();
102 page->in_cons = cons;
103 notify_remote_via_irq(info->irq);
104
105 return IRQ_HANDLED;
106}
107
108static int xenkbd_probe(struct xenbus_device *dev,
109 const struct xenbus_device_id *id)
110{
111 int ret, i, abs;
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 }
120 dev_set_drvdata(&dev->dev, info);
121 info->xbdev = dev;
122 info->irq = -1;
123 info->gref = -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 if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0)
131 abs = 0;
132 if (abs)
133 xenbus_printf(XBT_NIL, dev->nodename, "request-abs-pointer", "1");
134
135
136 kbd = input_allocate_device();
137 if (!kbd)
138 goto error_nomem;
139 kbd->name = "Xen Virtual Keyboard";
140 kbd->phys = info->phys;
141 kbd->id.bustype = BUS_PCI;
142 kbd->id.vendor = 0x5853;
143 kbd->id.product = 0xffff;
144
145 __set_bit(EV_KEY, kbd->evbit);
146 for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
147 __set_bit(i, kbd->keybit);
148 for (i = KEY_OK; i < KEY_MAX; i++)
149 __set_bit(i, kbd->keybit);
150
151 ret = input_register_device(kbd);
152 if (ret) {
153 input_free_device(kbd);
154 xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
155 goto error;
156 }
157 info->kbd = kbd;
158
159
160 ptr = input_allocate_device();
161 if (!ptr)
162 goto error_nomem;
163 ptr->name = "Xen Virtual Pointer";
164 ptr->phys = info->phys;
165 ptr->id.bustype = BUS_PCI;
166 ptr->id.vendor = 0x5853;
167 ptr->id.product = 0xfffe;
168
169 if (abs) {
170 __set_bit(EV_ABS, ptr->evbit);
171 input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
172 input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
173 } else {
174 input_set_capability(ptr, EV_REL, REL_X);
175 input_set_capability(ptr, EV_REL, REL_Y);
176 }
177 input_set_capability(ptr, EV_REL, REL_WHEEL);
178
179 __set_bit(EV_KEY, ptr->evbit);
180 for (i = BTN_LEFT; i <= BTN_TASK; i++)
181 __set_bit(i, ptr->keybit);
182
183 ret = input_register_device(ptr);
184 if (ret) {
185 input_free_device(ptr);
186 xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
187 goto error;
188 }
189 info->ptr = ptr;
190
191 ret = xenkbd_connect_backend(dev, info);
192 if (ret < 0)
193 goto error;
194
195 return 0;
196
197 error_nomem:
198 ret = -ENOMEM;
199 xenbus_dev_fatal(dev, ret, "allocating device memory");
200 error:
201 xenkbd_remove(dev);
202 return ret;
203}
204
205static int xenkbd_resume(struct xenbus_device *dev)
206{
207 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
208
209 xenkbd_disconnect_backend(info);
210 memset(info->page, 0, PAGE_SIZE);
211 return xenkbd_connect_backend(dev, info);
212}
213
214static int xenkbd_remove(struct xenbus_device *dev)
215{
216 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
217
218 xenkbd_disconnect_backend(info);
219 if (info->kbd)
220 input_unregister_device(info->kbd);
221 if (info->ptr)
222 input_unregister_device(info->ptr);
223 free_page((unsigned long)info->page);
224 kfree(info);
225 return 0;
226}
227
228static int xenkbd_connect_backend(struct xenbus_device *dev,
229 struct xenkbd_info *info)
230{
231 int ret, evtchn;
232 struct xenbus_transaction xbt;
233
234 ret = gnttab_grant_foreign_access(dev->otherend_id,
235 virt_to_mfn(info->page), 0);
236 if (ret < 0)
237 return ret;
238 info->gref = ret;
239
240 ret = xenbus_alloc_evtchn(dev, &evtchn);
241 if (ret)
242 goto error_grant;
243 ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
244 0, dev->devicetype, info);
245 if (ret < 0) {
246 xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
247 goto error_evtchan;
248 }
249 info->irq = ret;
250
251 again:
252 ret = xenbus_transaction_start(&xbt);
253 if (ret) {
254 xenbus_dev_fatal(dev, ret, "starting transaction");
255 goto error_irqh;
256 }
257 ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
258 virt_to_mfn(info->page));
259 if (ret)
260 goto error_xenbus;
261 ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref);
262 if (ret)
263 goto error_xenbus;
264 ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
265 evtchn);
266 if (ret)
267 goto error_xenbus;
268 ret = xenbus_transaction_end(xbt, 0);
269 if (ret) {
270 if (ret == -EAGAIN)
271 goto again;
272 xenbus_dev_fatal(dev, ret, "completing transaction");
273 goto error_irqh;
274 }
275
276 xenbus_switch_state(dev, XenbusStateInitialised);
277 return 0;
278
279 error_xenbus:
280 xenbus_transaction_end(xbt, 1);
281 xenbus_dev_fatal(dev, ret, "writing xenstore");
282 error_irqh:
283 unbind_from_irqhandler(info->irq, info);
284 info->irq = -1;
285 error_evtchan:
286 xenbus_free_evtchn(dev, evtchn);
287 error_grant:
288 gnttab_end_foreign_access(info->gref, 0, 0UL);
289 info->gref = -1;
290 return ret;
291}
292
293static void xenkbd_disconnect_backend(struct xenkbd_info *info)
294{
295 if (info->irq >= 0)
296 unbind_from_irqhandler(info->irq, info);
297 info->irq = -1;
298 if (info->gref >= 0)
299 gnttab_end_foreign_access(info->gref, 0, 0UL);
300 info->gref = -1;
301}
302
303static void xenkbd_backend_changed(struct xenbus_device *dev,
304 enum xenbus_state backend_state)
305{
306 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
307 int ret, val;
308
309 switch (backend_state) {
310 case XenbusStateInitialising:
311 case XenbusStateInitialised:
312 case XenbusStateReconfiguring:
313 case XenbusStateReconfigured:
314 case XenbusStateUnknown:
315 break;
316
317 case XenbusStateInitWait:
318InitWait:
319 ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
320 "feature-abs-pointer", "%d", &val);
321 if (ret < 0)
322 val = 0;
323 if (val) {
324 ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
325 "request-abs-pointer", "1");
326 if (ret)
327 pr_warning("xenkbd: can't request abs-pointer");
328 }
329
330 xenbus_switch_state(dev, XenbusStateConnected);
331 break;
332
333 case XenbusStateConnected:
334
335
336
337
338
339 if (dev->state != XenbusStateConnected)
340 goto InitWait;
341
342
343 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
344 "width", "%d", &val) > 0)
345 input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
346
347 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
348 "height", "%d", &val) > 0)
349 input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
350
351 break;
352
353 case XenbusStateClosed:
354 if (dev->state == XenbusStateClosed)
355 break;
356
357 case XenbusStateClosing:
358 xenbus_frontend_closed(dev);
359 break;
360 }
361}
362
363static const struct xenbus_device_id xenkbd_ids[] = {
364 { "vkbd" },
365 { "" }
366};
367
368static struct xenbus_driver xenkbd_driver = {
369 .ids = xenkbd_ids,
370 .probe = xenkbd_probe,
371 .remove = xenkbd_remove,
372 .resume = xenkbd_resume,
373 .otherend_changed = xenkbd_backend_changed,
374};
375
376static int __init xenkbd_init(void)
377{
378 if (!xen_domain())
379 return -ENODEV;
380
381
382 if (xen_initial_domain())
383 return -ENODEV;
384
385 if (!xen_has_pv_devices())
386 return -ENODEV;
387
388 return xenbus_register_frontend(&xenkbd_driver);
389}
390
391static void __exit xenkbd_cleanup(void)
392{
393 xenbus_unregister_driver(&xenkbd_driver);
394}
395
396module_init(xenkbd_init);
397module_exit(xenkbd_cleanup);
398
399MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
400MODULE_LICENSE("GPL");
401MODULE_ALIAS("xen:vkbd");
402
