Commit | Line | Data |
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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 | ||
da0c4901 JP |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
4ee36dc0 MA |
16 | #include <linux/kernel.h> |
17 | #include <linux/errno.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/input.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
1ccbf534 | 21 | |
4ee36dc0 | 22 | #include <asm/xen/hypervisor.h> |
1ccbf534 JF |
23 | |
24 | #include <xen/xen.h> | |
4ee36dc0 MA |
25 | #include <xen/events.h> |
26 | #include <xen/page.h> | |
0a4dfa5d DDG |
27 | #include <xen/grant_table.h> |
28 | #include <xen/interface/grant_table.h> | |
4ee36dc0 MA |
29 | #include <xen/interface/io/fbif.h> |
30 | #include <xen/interface/io/kbdif.h> | |
31 | #include <xen/xenbus.h> | |
51c71a3b | 32 | #include <xen/platform_pci.h> |
4ee36dc0 MA |
33 | |
34 | struct xenkbd_info { | |
35 | struct input_dev *kbd; | |
36 | struct input_dev *ptr; | |
37 | struct xenkbd_page *page; | |
0a4dfa5d | 38 | int gref; |
4ee36dc0 MA |
39 | int irq; |
40 | struct xenbus_device *xbdev; | |
41 | char phys[32]; | |
42 | }; | |
43 | ||
44 | static int xenkbd_remove(struct xenbus_device *); | |
45 | static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *); | |
46 | static void xenkbd_disconnect_backend(struct xenkbd_info *); | |
47 | ||
48 | /* | |
49 | * Note: if you need to send out events, see xenfb_do_update() for how | |
50 | * to do that. | |
51 | */ | |
52 | ||
53 | static 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(); /* ensure we see ring contents up to prod */ | |
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); | |
6ba0e7b3 MA |
73 | if (event->motion.rel_z) |
74 | input_report_rel(dev, REL_WHEEL, | |
75 | -event->motion.rel_z); | |
4ee36dc0 MA |
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 | |
da0c4901 JP |
87 | pr_warning("unhandled keycode 0x%x\n", |
88 | event->key.keycode); | |
4ee36dc0 MA |
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); | |
6ba0e7b3 MA |
93 | if (event->pos.rel_z) |
94 | input_report_rel(dev, REL_WHEEL, | |
95 | -event->pos.rel_z); | |
4ee36dc0 MA |
96 | break; |
97 | } | |
98 | if (dev) | |
99 | input_sync(dev); | |
100 | } | |
101 | mb(); /* ensure we got ring contents */ | |
102 | page->in_cons = cons; | |
103 | notify_remote_via_irq(info->irq); | |
104 | ||
105 | return IRQ_HANDLED; | |
106 | } | |
107 | ||
5298cc4c | 108 | static int xenkbd_probe(struct xenbus_device *dev, |
4ee36dc0 MA |
109 | const struct xenbus_device_id *id) |
110 | { | |
8c3c283e | 111 | int ret, i, abs; |
4ee36dc0 MA |
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 | } | |
1b713e00 | 120 | dev_set_drvdata(&dev->dev, info); |
4ee36dc0 MA |
121 | info->xbdev = dev; |
122 | info->irq = -1; | |
0a4dfa5d | 123 | info->gref = -1; |
4ee36dc0 MA |
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 | ||
8c3c283e OH |
130 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0) |
131 | abs = 0; | |
ec7aa963 IY |
132 | if (abs) { |
133 | ret = xenbus_printf(XBT_NIL, dev->nodename, | |
134 | "request-abs-pointer", "1"); | |
135 | if (ret) { | |
136 | pr_warning("xenkbd: can't request abs-pointer"); | |
137 | abs = 0; | |
138 | } | |
139 | } | |
8c3c283e | 140 | |
4ee36dc0 MA |
141 | /* keyboard */ |
142 | kbd = input_allocate_device(); | |
143 | if (!kbd) | |
144 | goto error_nomem; | |
145 | kbd->name = "Xen Virtual Keyboard"; | |
146 | kbd->phys = info->phys; | |
147 | kbd->id.bustype = BUS_PCI; | |
148 | kbd->id.vendor = 0x5853; | |
149 | kbd->id.product = 0xffff; | |
8c3c283e OH |
150 | |
151 | __set_bit(EV_KEY, kbd->evbit); | |
4ee36dc0 | 152 | for (i = KEY_ESC; i < KEY_UNKNOWN; i++) |
8c3c283e | 153 | __set_bit(i, kbd->keybit); |
4ee36dc0 | 154 | for (i = KEY_OK; i < KEY_MAX; i++) |
8c3c283e | 155 | __set_bit(i, kbd->keybit); |
4ee36dc0 MA |
156 | |
157 | ret = input_register_device(kbd); | |
158 | if (ret) { | |
159 | input_free_device(kbd); | |
160 | xenbus_dev_fatal(dev, ret, "input_register_device(kbd)"); | |
161 | goto error; | |
162 | } | |
163 | info->kbd = kbd; | |
164 | ||
165 | /* pointing device */ | |
166 | ptr = input_allocate_device(); | |
167 | if (!ptr) | |
168 | goto error_nomem; | |
169 | ptr->name = "Xen Virtual Pointer"; | |
170 | ptr->phys = info->phys; | |
171 | ptr->id.bustype = BUS_PCI; | |
172 | ptr->id.vendor = 0x5853; | |
173 | ptr->id.product = 0xfffe; | |
8c3c283e OH |
174 | |
175 | if (abs) { | |
176 | __set_bit(EV_ABS, ptr->evbit); | |
177 | input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0); | |
178 | input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0); | |
179 | } else { | |
180 | input_set_capability(ptr, EV_REL, REL_X); | |
181 | input_set_capability(ptr, EV_REL, REL_Y); | |
182 | } | |
183 | input_set_capability(ptr, EV_REL, REL_WHEEL); | |
184 | ||
185 | __set_bit(EV_KEY, ptr->evbit); | |
4ee36dc0 | 186 | for (i = BTN_LEFT; i <= BTN_TASK; i++) |
8c3c283e | 187 | __set_bit(i, ptr->keybit); |
4ee36dc0 MA |
188 | |
189 | ret = input_register_device(ptr); | |
190 | if (ret) { | |
191 | input_free_device(ptr); | |
192 | xenbus_dev_fatal(dev, ret, "input_register_device(ptr)"); | |
193 | goto error; | |
194 | } | |
195 | info->ptr = ptr; | |
196 | ||
197 | ret = xenkbd_connect_backend(dev, info); | |
198 | if (ret < 0) | |
199 | goto error; | |
200 | ||
201 | return 0; | |
202 | ||
203 | error_nomem: | |
204 | ret = -ENOMEM; | |
205 | xenbus_dev_fatal(dev, ret, "allocating device memory"); | |
206 | error: | |
207 | xenkbd_remove(dev); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | static int xenkbd_resume(struct xenbus_device *dev) | |
212 | { | |
1b713e00 | 213 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
214 | |
215 | xenkbd_disconnect_backend(info); | |
216 | memset(info->page, 0, PAGE_SIZE); | |
217 | return xenkbd_connect_backend(dev, info); | |
218 | } | |
219 | ||
220 | static int xenkbd_remove(struct xenbus_device *dev) | |
221 | { | |
1b713e00 | 222 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
223 | |
224 | xenkbd_disconnect_backend(info); | |
225 | if (info->kbd) | |
226 | input_unregister_device(info->kbd); | |
227 | if (info->ptr) | |
228 | input_unregister_device(info->ptr); | |
229 | free_page((unsigned long)info->page); | |
230 | kfree(info); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static int xenkbd_connect_backend(struct xenbus_device *dev, | |
235 | struct xenkbd_info *info) | |
236 | { | |
237 | int ret, evtchn; | |
238 | struct xenbus_transaction xbt; | |
239 | ||
0a4dfa5d | 240 | ret = gnttab_grant_foreign_access(dev->otherend_id, |
0df4f266 | 241 | virt_to_gfn(info->page), 0); |
0a4dfa5d DDG |
242 | if (ret < 0) |
243 | return ret; | |
244 | info->gref = ret; | |
245 | ||
4ee36dc0 MA |
246 | ret = xenbus_alloc_evtchn(dev, &evtchn); |
247 | if (ret) | |
0a4dfa5d | 248 | goto error_grant; |
4ee36dc0 MA |
249 | ret = bind_evtchn_to_irqhandler(evtchn, input_handler, |
250 | 0, dev->devicetype, info); | |
251 | if (ret < 0) { | |
4ee36dc0 | 252 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); |
0a4dfa5d | 253 | goto error_evtchan; |
4ee36dc0 MA |
254 | } |
255 | info->irq = ret; | |
256 | ||
257 | again: | |
258 | ret = xenbus_transaction_start(&xbt); | |
259 | if (ret) { | |
260 | xenbus_dev_fatal(dev, ret, "starting transaction"); | |
0a4dfa5d | 261 | goto error_irqh; |
4ee36dc0 MA |
262 | } |
263 | ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", | |
0df4f266 | 264 | virt_to_gfn(info->page)); |
0a4dfa5d DDG |
265 | if (ret) |
266 | goto error_xenbus; | |
267 | ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref); | |
4ee36dc0 MA |
268 | if (ret) |
269 | goto error_xenbus; | |
270 | ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", | |
271 | evtchn); | |
272 | if (ret) | |
273 | goto error_xenbus; | |
274 | ret = xenbus_transaction_end(xbt, 0); | |
275 | if (ret) { | |
276 | if (ret == -EAGAIN) | |
277 | goto again; | |
278 | xenbus_dev_fatal(dev, ret, "completing transaction"); | |
0a4dfa5d | 279 | goto error_irqh; |
4ee36dc0 MA |
280 | } |
281 | ||
282 | xenbus_switch_state(dev, XenbusStateInitialised); | |
283 | return 0; | |
284 | ||
285 | error_xenbus: | |
286 | xenbus_transaction_end(xbt, 1); | |
287 | xenbus_dev_fatal(dev, ret, "writing xenstore"); | |
0a4dfa5d DDG |
288 | error_irqh: |
289 | unbind_from_irqhandler(info->irq, info); | |
290 | info->irq = -1; | |
291 | error_evtchan: | |
292 | xenbus_free_evtchn(dev, evtchn); | |
293 | error_grant: | |
4d544e3b | 294 | gnttab_end_foreign_access(info->gref, 0, 0UL); |
0a4dfa5d | 295 | info->gref = -1; |
4ee36dc0 MA |
296 | return ret; |
297 | } | |
298 | ||
299 | static void xenkbd_disconnect_backend(struct xenkbd_info *info) | |
300 | { | |
301 | if (info->irq >= 0) | |
302 | unbind_from_irqhandler(info->irq, info); | |
303 | info->irq = -1; | |
0a4dfa5d | 304 | if (info->gref >= 0) |
4d544e3b | 305 | gnttab_end_foreign_access(info->gref, 0, 0UL); |
0a4dfa5d | 306 | info->gref = -1; |
4ee36dc0 MA |
307 | } |
308 | ||
309 | static void xenkbd_backend_changed(struct xenbus_device *dev, | |
310 | enum xenbus_state backend_state) | |
311 | { | |
1b713e00 | 312 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
c36b58e8 | 313 | int ret, val; |
4ee36dc0 MA |
314 | |
315 | switch (backend_state) { | |
316 | case XenbusStateInitialising: | |
317 | case XenbusStateInitialised: | |
b78c9512 NI |
318 | case XenbusStateReconfiguring: |
319 | case XenbusStateReconfigured: | |
4ee36dc0 | 320 | case XenbusStateUnknown: |
4ee36dc0 MA |
321 | break; |
322 | ||
323 | case XenbusStateInitWait: | |
324 | InitWait: | |
c36b58e8 IM |
325 | ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend, |
326 | "feature-abs-pointer", "%d", &val); | |
327 | if (ret < 0) | |
328 | val = 0; | |
329 | if (val) { | |
330 | ret = xenbus_printf(XBT_NIL, info->xbdev->nodename, | |
331 | "request-abs-pointer", "1"); | |
332 | if (ret) | |
333 | pr_warning("xenkbd: can't request abs-pointer"); | |
334 | } | |
335 | ||
4ee36dc0 MA |
336 | xenbus_switch_state(dev, XenbusStateConnected); |
337 | break; | |
338 | ||
339 | case XenbusStateConnected: | |
340 | /* | |
341 | * Work around xenbus race condition: If backend goes | |
342 | * through InitWait to Connected fast enough, we can | |
343 | * get Connected twice here. | |
344 | */ | |
345 | if (dev->state != XenbusStateConnected) | |
346 | goto InitWait; /* no InitWait seen yet, fudge it */ | |
e4dcff1f MA |
347 | |
348 | /* Set input abs params to match backend screen res */ | |
349 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
350 | "width", "%d", &val) > 0) | |
351 | input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0); | |
352 | ||
353 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
354 | "height", "%d", &val) > 0) | |
355 | input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0); | |
356 | ||
4ee36dc0 MA |
357 | break; |
358 | ||
2ebb939a DV |
359 | case XenbusStateClosed: |
360 | if (dev->state == XenbusStateClosed) | |
361 | break; | |
362 | /* Missed the backend's CLOSING state -- fallthrough */ | |
4ee36dc0 MA |
363 | case XenbusStateClosing: |
364 | xenbus_frontend_closed(dev); | |
365 | break; | |
366 | } | |
367 | } | |
368 | ||
c6d57093 | 369 | static const struct xenbus_device_id xenkbd_ids[] = { |
4ee36dc0 MA |
370 | { "vkbd" }, |
371 | { "" } | |
372 | }; | |
373 | ||
95afae48 DV |
374 | static struct xenbus_driver xenkbd_driver = { |
375 | .ids = xenkbd_ids, | |
4ee36dc0 MA |
376 | .probe = xenkbd_probe, |
377 | .remove = xenkbd_remove, | |
378 | .resume = xenkbd_resume, | |
379 | .otherend_changed = xenkbd_backend_changed, | |
95afae48 | 380 | }; |
4ee36dc0 MA |
381 | |
382 | static int __init xenkbd_init(void) | |
383 | { | |
5f098ecd | 384 | if (!xen_domain()) |
4ee36dc0 MA |
385 | return -ENODEV; |
386 | ||
387 | /* Nothing to do if running in dom0. */ | |
6e833587 | 388 | if (xen_initial_domain()) |
4ee36dc0 MA |
389 | return -ENODEV; |
390 | ||
51c71a3b KRW |
391 | if (!xen_has_pv_devices()) |
392 | return -ENODEV; | |
393 | ||
ffb78a26 | 394 | return xenbus_register_frontend(&xenkbd_driver); |
4ee36dc0 MA |
395 | } |
396 | ||
397 | static void __exit xenkbd_cleanup(void) | |
398 | { | |
ffb78a26 | 399 | xenbus_unregister_driver(&xenkbd_driver); |
4ee36dc0 MA |
400 | } |
401 | ||
402 | module_init(xenkbd_init); | |
403 | module_exit(xenkbd_cleanup); | |
404 | ||
1e892c95 | 405 | MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend"); |
4ee36dc0 | 406 | MODULE_LICENSE("GPL"); |
1e892c95 | 407 | MODULE_ALIAS("xen:vkbd"); |