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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 | ||
14 | /* | |
15 | * TODO: | |
16 | * | |
17 | * Switch to grant tables together with xen-fbfront.c. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/input.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1ccbf534 | 25 | |
4ee36dc0 | 26 | #include <asm/xen/hypervisor.h> |
1ccbf534 JF |
27 | |
28 | #include <xen/xen.h> | |
4ee36dc0 MA |
29 | #include <xen/events.h> |
30 | #include <xen/page.h> | |
31 | #include <xen/interface/io/fbif.h> | |
32 | #include <xen/interface/io/kbdif.h> | |
33 | #include <xen/xenbus.h> | |
34 | ||
35 | struct xenkbd_info { | |
36 | struct input_dev *kbd; | |
37 | struct input_dev *ptr; | |
38 | struct xenkbd_page *page; | |
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 | |
87 | printk(KERN_WARNING | |
88 | "xenkbd: unhandled keycode 0x%x\n", | |
89 | event->key.keycode); | |
90 | break; | |
91 | case XENKBD_TYPE_POS: | |
92 | input_report_abs(dev, ABS_X, event->pos.abs_x); | |
93 | input_report_abs(dev, ABS_Y, event->pos.abs_y); | |
6ba0e7b3 MA |
94 | if (event->pos.rel_z) |
95 | input_report_rel(dev, REL_WHEEL, | |
96 | -event->pos.rel_z); | |
4ee36dc0 MA |
97 | break; |
98 | } | |
99 | if (dev) | |
100 | input_sync(dev); | |
101 | } | |
102 | mb(); /* ensure we got ring contents */ | |
103 | page->in_cons = cons; | |
104 | notify_remote_via_irq(info->irq); | |
105 | ||
106 | return IRQ_HANDLED; | |
107 | } | |
108 | ||
109 | static int __devinit xenkbd_probe(struct xenbus_device *dev, | |
110 | const struct xenbus_device_id *id) | |
111 | { | |
112 | int ret, i; | |
113 | struct xenkbd_info *info; | |
114 | struct input_dev *kbd, *ptr; | |
115 | ||
116 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
117 | if (!info) { | |
118 | xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure"); | |
119 | return -ENOMEM; | |
120 | } | |
1b713e00 | 121 | dev_set_drvdata(&dev->dev, info); |
4ee36dc0 MA |
122 | info->xbdev = dev; |
123 | info->irq = -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 | /* keyboard */ | |
131 | kbd = input_allocate_device(); | |
132 | if (!kbd) | |
133 | goto error_nomem; | |
134 | kbd->name = "Xen Virtual Keyboard"; | |
135 | kbd->phys = info->phys; | |
136 | kbd->id.bustype = BUS_PCI; | |
137 | kbd->id.vendor = 0x5853; | |
138 | kbd->id.product = 0xffff; | |
139 | kbd->evbit[0] = BIT(EV_KEY); | |
140 | for (i = KEY_ESC; i < KEY_UNKNOWN; i++) | |
141 | set_bit(i, kbd->keybit); | |
142 | for (i = KEY_OK; i < KEY_MAX; i++) | |
143 | set_bit(i, kbd->keybit); | |
144 | ||
145 | ret = input_register_device(kbd); | |
146 | if (ret) { | |
147 | input_free_device(kbd); | |
148 | xenbus_dev_fatal(dev, ret, "input_register_device(kbd)"); | |
149 | goto error; | |
150 | } | |
151 | info->kbd = kbd; | |
152 | ||
153 | /* pointing device */ | |
154 | ptr = input_allocate_device(); | |
155 | if (!ptr) | |
156 | goto error_nomem; | |
157 | ptr->name = "Xen Virtual Pointer"; | |
158 | ptr->phys = info->phys; | |
159 | ptr->id.bustype = BUS_PCI; | |
160 | ptr->id.vendor = 0x5853; | |
161 | ptr->id.product = 0xfffe; | |
162 | ptr->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS); | |
163 | for (i = BTN_LEFT; i <= BTN_TASK; i++) | |
164 | set_bit(i, ptr->keybit); | |
6ba0e7b3 | 165 | ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y) | BIT(REL_WHEEL); |
4ee36dc0 MA |
166 | input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0); |
167 | input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0); | |
168 | ||
169 | ret = input_register_device(ptr); | |
170 | if (ret) { | |
171 | input_free_device(ptr); | |
172 | xenbus_dev_fatal(dev, ret, "input_register_device(ptr)"); | |
173 | goto error; | |
174 | } | |
175 | info->ptr = ptr; | |
176 | ||
177 | ret = xenkbd_connect_backend(dev, info); | |
178 | if (ret < 0) | |
179 | goto error; | |
180 | ||
181 | return 0; | |
182 | ||
183 | error_nomem: | |
184 | ret = -ENOMEM; | |
185 | xenbus_dev_fatal(dev, ret, "allocating device memory"); | |
186 | error: | |
187 | xenkbd_remove(dev); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | static int xenkbd_resume(struct xenbus_device *dev) | |
192 | { | |
1b713e00 | 193 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
194 | |
195 | xenkbd_disconnect_backend(info); | |
196 | memset(info->page, 0, PAGE_SIZE); | |
197 | return xenkbd_connect_backend(dev, info); | |
198 | } | |
199 | ||
200 | static int xenkbd_remove(struct xenbus_device *dev) | |
201 | { | |
1b713e00 | 202 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
203 | |
204 | xenkbd_disconnect_backend(info); | |
205 | if (info->kbd) | |
206 | input_unregister_device(info->kbd); | |
207 | if (info->ptr) | |
208 | input_unregister_device(info->ptr); | |
209 | free_page((unsigned long)info->page); | |
210 | kfree(info); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static int xenkbd_connect_backend(struct xenbus_device *dev, | |
215 | struct xenkbd_info *info) | |
216 | { | |
217 | int ret, evtchn; | |
218 | struct xenbus_transaction xbt; | |
219 | ||
220 | ret = xenbus_alloc_evtchn(dev, &evtchn); | |
221 | if (ret) | |
222 | return ret; | |
223 | ret = bind_evtchn_to_irqhandler(evtchn, input_handler, | |
224 | 0, dev->devicetype, info); | |
225 | if (ret < 0) { | |
226 | xenbus_free_evtchn(dev, evtchn); | |
227 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); | |
228 | return ret; | |
229 | } | |
230 | info->irq = ret; | |
231 | ||
232 | again: | |
233 | ret = xenbus_transaction_start(&xbt); | |
234 | if (ret) { | |
235 | xenbus_dev_fatal(dev, ret, "starting transaction"); | |
236 | return ret; | |
237 | } | |
238 | ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", | |
239 | virt_to_mfn(info->page)); | |
240 | if (ret) | |
241 | goto error_xenbus; | |
242 | ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", | |
243 | evtchn); | |
244 | if (ret) | |
245 | goto error_xenbus; | |
246 | ret = xenbus_transaction_end(xbt, 0); | |
247 | if (ret) { | |
248 | if (ret == -EAGAIN) | |
249 | goto again; | |
250 | xenbus_dev_fatal(dev, ret, "completing transaction"); | |
251 | return ret; | |
252 | } | |
253 | ||
254 | xenbus_switch_state(dev, XenbusStateInitialised); | |
255 | return 0; | |
256 | ||
257 | error_xenbus: | |
258 | xenbus_transaction_end(xbt, 1); | |
259 | xenbus_dev_fatal(dev, ret, "writing xenstore"); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | static void xenkbd_disconnect_backend(struct xenkbd_info *info) | |
264 | { | |
265 | if (info->irq >= 0) | |
266 | unbind_from_irqhandler(info->irq, info); | |
267 | info->irq = -1; | |
268 | } | |
269 | ||
270 | static void xenkbd_backend_changed(struct xenbus_device *dev, | |
271 | enum xenbus_state backend_state) | |
272 | { | |
1b713e00 | 273 | struct xenkbd_info *info = dev_get_drvdata(&dev->dev); |
4ee36dc0 MA |
274 | int ret, val; |
275 | ||
276 | switch (backend_state) { | |
277 | case XenbusStateInitialising: | |
278 | case XenbusStateInitialised: | |
279 | case XenbusStateUnknown: | |
280 | case XenbusStateClosed: | |
281 | break; | |
282 | ||
283 | case XenbusStateInitWait: | |
284 | InitWait: | |
285 | ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
286 | "feature-abs-pointer", "%d", &val); | |
287 | if (ret < 0) | |
288 | val = 0; | |
289 | if (val) { | |
290 | ret = xenbus_printf(XBT_NIL, info->xbdev->nodename, | |
291 | "request-abs-pointer", "1"); | |
292 | if (ret) | |
293 | printk(KERN_WARNING | |
294 | "xenkbd: can't request abs-pointer"); | |
295 | } | |
296 | xenbus_switch_state(dev, XenbusStateConnected); | |
297 | break; | |
298 | ||
299 | case XenbusStateConnected: | |
300 | /* | |
301 | * Work around xenbus race condition: If backend goes | |
302 | * through InitWait to Connected fast enough, we can | |
303 | * get Connected twice here. | |
304 | */ | |
305 | if (dev->state != XenbusStateConnected) | |
306 | goto InitWait; /* no InitWait seen yet, fudge it */ | |
e4dcff1f MA |
307 | |
308 | /* Set input abs params to match backend screen res */ | |
309 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
310 | "width", "%d", &val) > 0) | |
311 | input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0); | |
312 | ||
313 | if (xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
314 | "height", "%d", &val) > 0) | |
315 | input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0); | |
316 | ||
4ee36dc0 MA |
317 | break; |
318 | ||
319 | case XenbusStateClosing: | |
320 | xenbus_frontend_closed(dev); | |
321 | break; | |
322 | } | |
323 | } | |
324 | ||
c6d57093 | 325 | static const struct xenbus_device_id xenkbd_ids[] = { |
4ee36dc0 MA |
326 | { "vkbd" }, |
327 | { "" } | |
328 | }; | |
329 | ||
ffb78a26 | 330 | static struct xenbus_driver xenkbd_driver = { |
4ee36dc0 MA |
331 | .name = "vkbd", |
332 | .owner = THIS_MODULE, | |
333 | .ids = xenkbd_ids, | |
334 | .probe = xenkbd_probe, | |
335 | .remove = xenkbd_remove, | |
336 | .resume = xenkbd_resume, | |
337 | .otherend_changed = xenkbd_backend_changed, | |
338 | }; | |
339 | ||
340 | static int __init xenkbd_init(void) | |
341 | { | |
bee6ab53 | 342 | if (!xen_pv_domain()) |
4ee36dc0 MA |
343 | return -ENODEV; |
344 | ||
345 | /* Nothing to do if running in dom0. */ | |
6e833587 | 346 | if (xen_initial_domain()) |
4ee36dc0 MA |
347 | return -ENODEV; |
348 | ||
ffb78a26 | 349 | return xenbus_register_frontend(&xenkbd_driver); |
4ee36dc0 MA |
350 | } |
351 | ||
352 | static void __exit xenkbd_cleanup(void) | |
353 | { | |
ffb78a26 | 354 | xenbus_unregister_driver(&xenkbd_driver); |
4ee36dc0 MA |
355 | } |
356 | ||
357 | module_init(xenkbd_init); | |
358 | module_exit(xenkbd_cleanup); | |
359 | ||
1e892c95 | 360 | MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend"); |
4ee36dc0 | 361 | MODULE_LICENSE("GPL"); |
1e892c95 | 362 | MODULE_ALIAS("xen:vkbd"); |