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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 | #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 | |
33 | struct xenkbd_info { |
34 | struct input_dev *kbd; |
35 | struct input_dev *ptr; |
36 | struct xenkbd_page *page; |
37 | int gref; |
38 | int irq; |
39 | struct xenbus_device *xbdev; |
40 | char phys[32]; |
41 | }; |
42 | |
43 | static int xenkbd_remove(struct xenbus_device *); |
44 | static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *); |
45 | static void xenkbd_disconnect_backend(struct xenkbd_info *); |
46 | |
47 | /* |
48 | * Note: if you need to send out events, see xenfb_do_update() for how |
49 | * to do that. |
50 | */ |
51 | |
52 | static irqreturn_t input_handler(int rq, void *dev_id) |
53 | { |
54 | struct xenkbd_info *info = dev_id; |
55 | struct xenkbd_page *page = info->page; |
56 | __u32 cons, prod; |
57 | |
58 | prod = page->in_prod; |
59 | if (prod == page->in_cons) |
60 | return IRQ_HANDLED; |
61 | rmb(); /* ensure we see ring contents up to prod */ |
62 | for (cons = page->in_cons; cons != prod; cons++) { |
63 | union xenkbd_in_event *event; |
64 | struct input_dev *dev; |
65 | event = &XENKBD_IN_RING_REF(page, cons); |
66 | |
67 | dev = info->ptr; |
68 | switch (event->type) { |
69 | case XENKBD_TYPE_MOTION: |
70 | input_report_rel(dev, REL_X, event->motion.rel_x); |
71 | input_report_rel(dev, REL_Y, event->motion.rel_y); |
72 | if (event->motion.rel_z) |
73 | input_report_rel(dev, REL_WHEEL, |
74 | -event->motion.rel_z); |
75 | break; |
76 | case XENKBD_TYPE_KEY: |
77 | dev = NULL; |
78 | if (test_bit(event->key.keycode, info->kbd->keybit)) |
79 | dev = info->kbd; |
80 | if (test_bit(event->key.keycode, info->ptr->keybit)) |
81 | dev = info->ptr; |
82 | if (dev) |
83 | input_report_key(dev, event->key.keycode, |
84 | event->key.pressed); |
85 | else |
86 | pr_warning("unhandled keycode 0x%x\n", |
87 | event->key.keycode); |
88 | break; |
89 | case XENKBD_TYPE_POS: |
90 | input_report_abs(dev, ABS_X, event->pos.abs_x); |
91 | input_report_abs(dev, ABS_Y, event->pos.abs_y); |
92 | if (event->pos.rel_z) |
93 | input_report_rel(dev, REL_WHEEL, |
94 | -event->pos.rel_z); |
95 | break; |
96 | } |
97 | if (dev) |
98 | input_sync(dev); |
99 | } |
100 | mb(); /* ensure we got ring contents */ |
101 | page->in_cons = cons; |
102 | notify_remote_via_irq(info->irq); |
103 | |
104 | return IRQ_HANDLED; |
105 | } |
106 | |
107 | static int xenkbd_probe(struct xenbus_device *dev, |
108 | const struct xenbus_device_id *id) |
109 | { |
110 | int ret, i, abs; |
111 | struct xenkbd_info *info; |
112 | struct input_dev *kbd, *ptr; |
113 | |
114 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
115 | if (!info) { |
116 | xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure"); |
117 | return -ENOMEM; |
118 | } |
119 | dev_set_drvdata(&dev->dev, info); |
120 | info->xbdev = dev; |
121 | info->irq = -1; |
122 | info->gref = -1; |
123 | snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename); |
124 | |
125 | info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); |
126 | if (!info->page) |
127 | goto error_nomem; |
128 | |
129 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0) |
130 | abs = 0; |
131 | if (abs) |
132 | xenbus_printf(XBT_NIL, dev->nodename, "request-abs-pointer", "1"); |
133 | |
134 | /* keyboard */ |
135 | kbd = input_allocate_device(); |
136 | if (!kbd) |
137 | goto error_nomem; |
138 | kbd->name = "Xen Virtual Keyboard"; |
139 | kbd->phys = info->phys; |
140 | kbd->id.bustype = BUS_PCI; |
141 | kbd->id.vendor = 0x5853; |
142 | kbd->id.product = 0xffff; |
143 | |
144 | __set_bit(EV_KEY, kbd->evbit); |
145 | for (i = KEY_ESC; i < KEY_UNKNOWN; i++) |
146 | __set_bit(i, kbd->keybit); |
147 | for (i = KEY_OK; i < KEY_MAX; i++) |
148 | __set_bit(i, kbd->keybit); |
149 | |
150 | ret = input_register_device(kbd); |
151 | if (ret) { |
152 | input_free_device(kbd); |
153 | xenbus_dev_fatal(dev, ret, "input_register_device(kbd)"); |
154 | goto error; |
155 | } |
156 | info->kbd = kbd; |
157 | |
158 | /* pointing device */ |
159 | ptr = input_allocate_device(); |
160 | if (!ptr) |
161 | goto error_nomem; |
162 | ptr->name = "Xen Virtual Pointer"; |
163 | ptr->phys = info->phys; |
164 | ptr->id.bustype = BUS_PCI; |
165 | ptr->id.vendor = 0x5853; |
166 | ptr->id.product = 0xfffe; |
167 | |
168 | if (abs) { |
169 | __set_bit(EV_ABS, ptr->evbit); |
170 | input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0); |
171 | input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0); |
172 | } else { |
173 | input_set_capability(ptr, EV_REL, REL_X); |
174 | input_set_capability(ptr, EV_REL, REL_Y); |
175 | } |
176 | input_set_capability(ptr, EV_REL, REL_WHEEL); |
177 | |
178 | __set_bit(EV_KEY, ptr->evbit); |
179 | for (i = BTN_LEFT; i <= BTN_TASK; i++) |
180 | __set_bit(i, ptr->keybit); |
181 | |
182 | ret = input_register_device(ptr); |
183 | if (ret) { |
184 | input_free_device(ptr); |
185 | xenbus_dev_fatal(dev, ret, "input_register_device(ptr)"); |
186 | goto error; |
187 | } |
188 | info->ptr = ptr; |
189 | |
190 | ret = xenkbd_connect_backend(dev, info); |
191 | if (ret < 0) |
192 | goto error; |
193 | |
194 | return 0; |
195 | |
196 | error_nomem: |
197 | ret = -ENOMEM; |
198 | xenbus_dev_fatal(dev, ret, "allocating device memory"); |
199 | error: |
200 | xenkbd_remove(dev); |
201 | return ret; |
202 | } |
203 | |
204 | static int xenkbd_resume(struct xenbus_device *dev) |
205 | { |
206 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
207 | |
208 | xenkbd_disconnect_backend(info); |
209 | memset(info->page, 0, PAGE_SIZE); |
210 | return xenkbd_connect_backend(dev, info); |
211 | } |
212 | |
213 | static int xenkbd_remove(struct xenbus_device *dev) |
214 | { |
215 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
216 | |
217 | xenkbd_disconnect_backend(info); |
218 | if (info->kbd) |
219 | input_unregister_device(info->kbd); |
220 | if (info->ptr) |
221 | input_unregister_device(info->ptr); |
222 | free_page((unsigned long)info->page); |
223 | kfree(info); |
224 | return 0; |
225 | } |
226 | |
227 | static int xenkbd_connect_backend(struct xenbus_device *dev, |
228 | struct xenkbd_info *info) |
229 | { |
230 | int ret, evtchn; |
231 | struct xenbus_transaction xbt; |
232 | |
233 | ret = gnttab_grant_foreign_access(dev->otherend_id, |
234 | virt_to_mfn(info->page), 0); |
235 | if (ret < 0) |
236 | return ret; |
237 | info->gref = ret; |
238 | |
239 | ret = xenbus_alloc_evtchn(dev, &evtchn); |
240 | if (ret) |
241 | goto error_grant; |
242 | ret = bind_evtchn_to_irqhandler(evtchn, input_handler, |
243 | 0, dev->devicetype, info); |
244 | if (ret < 0) { |
245 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); |
246 | goto error_evtchan; |
247 | } |
248 | info->irq = ret; |
249 | |
250 | again: |
251 | ret = xenbus_transaction_start(&xbt); |
252 | if (ret) { |
253 | xenbus_dev_fatal(dev, ret, "starting transaction"); |
254 | goto error_irqh; |
255 | } |
256 | ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", |
257 | virt_to_mfn(info->page)); |
258 | if (ret) |
259 | goto error_xenbus; |
260 | ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref); |
261 | if (ret) |
262 | goto error_xenbus; |
263 | ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", |
264 | evtchn); |
265 | if (ret) |
266 | goto error_xenbus; |
267 | ret = xenbus_transaction_end(xbt, 0); |
268 | if (ret) { |
269 | if (ret == -EAGAIN) |
270 | goto again; |
271 | xenbus_dev_fatal(dev, ret, "completing transaction"); |
272 | goto error_irqh; |
273 | } |
274 | |
275 | xenbus_switch_state(dev, XenbusStateInitialised); |
276 | return 0; |
277 | |
278 | error_xenbus: |
279 | xenbus_transaction_end(xbt, 1); |
280 | xenbus_dev_fatal(dev, ret, "writing xenstore"); |
281 | error_irqh: |
282 | unbind_from_irqhandler(info->irq, info); |
283 | info->irq = -1; |
284 | error_evtchan: |
285 | xenbus_free_evtchn(dev, evtchn); |
286 | error_grant: |
287 | gnttab_end_foreign_access_ref(info->gref, 0); |
288 | info->gref = -1; |
289 | return ret; |
290 | } |
291 | |
292 | static void xenkbd_disconnect_backend(struct xenkbd_info *info) |
293 | { |
294 | if (info->irq >= 0) |
295 | unbind_from_irqhandler(info->irq, info); |
296 | info->irq = -1; |
297 | if (info->gref >= 0) |
298 | gnttab_end_foreign_access_ref(info->gref, 0); |
299 | info->gref = -1; |
300 | } |
301 | |
302 | static void xenkbd_backend_changed(struct xenbus_device *dev, |
303 | enum xenbus_state backend_state) |
304 | { |
305 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
306 | int ret, val; |
307 | |
308 | switch (backend_state) { |
309 | case XenbusStateInitialising: |
310 | case XenbusStateInitialised: |
311 | case XenbusStateReconfiguring: |
312 | case XenbusStateReconfigured: |
313 | case XenbusStateUnknown: |
314 | break; |
315 | |
316 | case XenbusStateInitWait: |
317 | InitWait: |
318 | ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend, |
319 | "feature-abs-pointer", "%d", &val); |
320 | if (ret < 0) |
321 | val = 0; |
322 | if (val) { |
323 | ret = xenbus_printf(XBT_NIL, info->xbdev->nodename, |
324 | "request-abs-pointer", "1"); |
325 | if (ret) |
326 | pr_warning("xenkbd: can't request abs-pointer"); |
327 | } |
328 | |
329 | xenbus_switch_state(dev, XenbusStateConnected); |
330 | break; |
331 | |
332 | case XenbusStateConnected: |
333 | /* |
334 | * Work around xenbus race condition: If backend goes |
335 | * through InitWait to Connected fast enough, we can |
336 | * get Connected twice here. |
337 | */ |
338 | if (dev->state != XenbusStateConnected) |
339 | goto InitWait; /* no InitWait seen yet, fudge it */ |
340 | |
341 | /* Set input abs params to match backend screen res */ |
342 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, |
343 | "width", "%d", &val) > 0) |
344 | input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0); |
345 | |
346 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, |
347 | "height", "%d", &val) > 0) |
348 | input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0); |
349 | |
350 | break; |
351 | |
352 | case XenbusStateClosed: |
353 | if (dev->state == XenbusStateClosed) |
354 | break; |
355 | /* Missed the backend's CLOSING state -- fallthrough */ |
356 | case XenbusStateClosing: |
357 | xenbus_frontend_closed(dev); |
358 | break; |
359 | } |
360 | } |
361 | |
362 | static const struct xenbus_device_id xenkbd_ids[] = { |
363 | { "vkbd" }, |
364 | { "" } |
365 | }; |
366 | |
367 | static DEFINE_XENBUS_DRIVER(xenkbd, , |
368 | .probe = xenkbd_probe, |
369 | .remove = xenkbd_remove, |
370 | .resume = xenkbd_resume, |
371 | .otherend_changed = xenkbd_backend_changed, |
372 | ); |
373 | |
374 | static int __init xenkbd_init(void) |
375 | { |
376 | if (!xen_domain()) |
377 | return -ENODEV; |
378 | |
379 | /* Nothing to do if running in dom0. */ |
380 | if (xen_initial_domain()) |
381 | return -ENODEV; |
382 | |
383 | return xenbus_register_frontend(&xenkbd_driver); |
384 | } |
385 | |
386 | static void __exit xenkbd_cleanup(void) |
387 | { |
388 | xenbus_unregister_driver(&xenkbd_driver); |
389 | } |
390 | |
391 | module_init(xenkbd_init); |
392 | module_exit(xenkbd_cleanup); |
393 | |
394 | MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend"); |
395 | MODULE_LICENSE("GPL"); |
396 | MODULE_ALIAS("xen:vkbd"); |
397 |
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