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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> | |
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 | ||
31 | struct 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 | ||
40 | static int xenkbd_remove(struct xenbus_device *); | |
41 | static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *); | |
42 | static void xenkbd_disconnect_backend(struct xenkbd_info *); | |
43 | ||
44 | /* | |
45 | * Note: if you need to send out events, see xenfb_do_update() for how | |
46 | * to do that. | |
47 | */ | |
48 | ||
49 | static 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(); /* ensure we see ring contents up to prod */ | |
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 | break; | |
70 | case XENKBD_TYPE_KEY: | |
71 | dev = NULL; | |
72 | if (test_bit(event->key.keycode, info->kbd->keybit)) | |
73 | dev = info->kbd; | |
74 | if (test_bit(event->key.keycode, info->ptr->keybit)) | |
75 | dev = info->ptr; | |
76 | if (dev) | |
77 | input_report_key(dev, event->key.keycode, | |
78 | event->key.pressed); | |
79 | else | |
80 | printk(KERN_WARNING | |
81 | "xenkbd: unhandled keycode 0x%x\n", | |
82 | event->key.keycode); | |
83 | break; | |
84 | case XENKBD_TYPE_POS: | |
85 | input_report_abs(dev, ABS_X, event->pos.abs_x); | |
86 | input_report_abs(dev, ABS_Y, event->pos.abs_y); | |
87 | break; | |
88 | } | |
89 | if (dev) | |
90 | input_sync(dev); | |
91 | } | |
92 | mb(); /* ensure we got ring contents */ | |
93 | page->in_cons = cons; | |
94 | notify_remote_via_irq(info->irq); | |
95 | ||
96 | return IRQ_HANDLED; | |
97 | } | |
98 | ||
99 | static int __devinit xenkbd_probe(struct xenbus_device *dev, | |
100 | const struct xenbus_device_id *id) | |
101 | { | |
102 | int ret, i; | |
103 | struct xenkbd_info *info; | |
104 | struct input_dev *kbd, *ptr; | |
105 | ||
106 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
107 | if (!info) { | |
108 | xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure"); | |
109 | return -ENOMEM; | |
110 | } | |
111 | dev->dev.driver_data = info; | |
112 | info->xbdev = dev; | |
113 | info->irq = -1; | |
114 | snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename); | |
115 | ||
116 | info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
117 | if (!info->page) | |
118 | goto error_nomem; | |
119 | ||
120 | /* keyboard */ | |
121 | kbd = input_allocate_device(); | |
122 | if (!kbd) | |
123 | goto error_nomem; | |
124 | kbd->name = "Xen Virtual Keyboard"; | |
125 | kbd->phys = info->phys; | |
126 | kbd->id.bustype = BUS_PCI; | |
127 | kbd->id.vendor = 0x5853; | |
128 | kbd->id.product = 0xffff; | |
129 | kbd->evbit[0] = BIT(EV_KEY); | |
130 | for (i = KEY_ESC; i < KEY_UNKNOWN; i++) | |
131 | set_bit(i, kbd->keybit); | |
132 | for (i = KEY_OK; i < KEY_MAX; i++) | |
133 | set_bit(i, kbd->keybit); | |
134 | ||
135 | ret = input_register_device(kbd); | |
136 | if (ret) { | |
137 | input_free_device(kbd); | |
138 | xenbus_dev_fatal(dev, ret, "input_register_device(kbd)"); | |
139 | goto error; | |
140 | } | |
141 | info->kbd = kbd; | |
142 | ||
143 | /* pointing device */ | |
144 | ptr = input_allocate_device(); | |
145 | if (!ptr) | |
146 | goto error_nomem; | |
147 | ptr->name = "Xen Virtual Pointer"; | |
148 | ptr->phys = info->phys; | |
149 | ptr->id.bustype = BUS_PCI; | |
150 | ptr->id.vendor = 0x5853; | |
151 | ptr->id.product = 0xfffe; | |
152 | ptr->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS); | |
153 | for (i = BTN_LEFT; i <= BTN_TASK; i++) | |
154 | set_bit(i, ptr->keybit); | |
155 | ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y); | |
156 | input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0); | |
157 | input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0); | |
158 | ||
159 | ret = input_register_device(ptr); | |
160 | if (ret) { | |
161 | input_free_device(ptr); | |
162 | xenbus_dev_fatal(dev, ret, "input_register_device(ptr)"); | |
163 | goto error; | |
164 | } | |
165 | info->ptr = ptr; | |
166 | ||
167 | ret = xenkbd_connect_backend(dev, info); | |
168 | if (ret < 0) | |
169 | goto error; | |
170 | ||
171 | return 0; | |
172 | ||
173 | error_nomem: | |
174 | ret = -ENOMEM; | |
175 | xenbus_dev_fatal(dev, ret, "allocating device memory"); | |
176 | error: | |
177 | xenkbd_remove(dev); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | static int xenkbd_resume(struct xenbus_device *dev) | |
182 | { | |
183 | struct xenkbd_info *info = dev->dev.driver_data; | |
184 | ||
185 | xenkbd_disconnect_backend(info); | |
186 | memset(info->page, 0, PAGE_SIZE); | |
187 | return xenkbd_connect_backend(dev, info); | |
188 | } | |
189 | ||
190 | static int xenkbd_remove(struct xenbus_device *dev) | |
191 | { | |
192 | struct xenkbd_info *info = dev->dev.driver_data; | |
193 | ||
194 | xenkbd_disconnect_backend(info); | |
195 | if (info->kbd) | |
196 | input_unregister_device(info->kbd); | |
197 | if (info->ptr) | |
198 | input_unregister_device(info->ptr); | |
199 | free_page((unsigned long)info->page); | |
200 | kfree(info); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int xenkbd_connect_backend(struct xenbus_device *dev, | |
205 | struct xenkbd_info *info) | |
206 | { | |
207 | int ret, evtchn; | |
208 | struct xenbus_transaction xbt; | |
209 | ||
210 | ret = xenbus_alloc_evtchn(dev, &evtchn); | |
211 | if (ret) | |
212 | return ret; | |
213 | ret = bind_evtchn_to_irqhandler(evtchn, input_handler, | |
214 | 0, dev->devicetype, info); | |
215 | if (ret < 0) { | |
216 | xenbus_free_evtchn(dev, evtchn); | |
217 | xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); | |
218 | return ret; | |
219 | } | |
220 | info->irq = ret; | |
221 | ||
222 | again: | |
223 | ret = xenbus_transaction_start(&xbt); | |
224 | if (ret) { | |
225 | xenbus_dev_fatal(dev, ret, "starting transaction"); | |
226 | return ret; | |
227 | } | |
228 | ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", | |
229 | virt_to_mfn(info->page)); | |
230 | if (ret) | |
231 | goto error_xenbus; | |
232 | ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u", | |
233 | evtchn); | |
234 | if (ret) | |
235 | goto error_xenbus; | |
236 | ret = xenbus_transaction_end(xbt, 0); | |
237 | if (ret) { | |
238 | if (ret == -EAGAIN) | |
239 | goto again; | |
240 | xenbus_dev_fatal(dev, ret, "completing transaction"); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | xenbus_switch_state(dev, XenbusStateInitialised); | |
245 | return 0; | |
246 | ||
247 | error_xenbus: | |
248 | xenbus_transaction_end(xbt, 1); | |
249 | xenbus_dev_fatal(dev, ret, "writing xenstore"); | |
250 | return ret; | |
251 | } | |
252 | ||
253 | static void xenkbd_disconnect_backend(struct xenkbd_info *info) | |
254 | { | |
255 | if (info->irq >= 0) | |
256 | unbind_from_irqhandler(info->irq, info); | |
257 | info->irq = -1; | |
258 | } | |
259 | ||
260 | static void xenkbd_backend_changed(struct xenbus_device *dev, | |
261 | enum xenbus_state backend_state) | |
262 | { | |
263 | struct xenkbd_info *info = dev->dev.driver_data; | |
264 | int ret, val; | |
265 | ||
266 | switch (backend_state) { | |
267 | case XenbusStateInitialising: | |
268 | case XenbusStateInitialised: | |
269 | case XenbusStateUnknown: | |
270 | case XenbusStateClosed: | |
271 | break; | |
272 | ||
273 | case XenbusStateInitWait: | |
274 | InitWait: | |
275 | ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend, | |
276 | "feature-abs-pointer", "%d", &val); | |
277 | if (ret < 0) | |
278 | val = 0; | |
279 | if (val) { | |
280 | ret = xenbus_printf(XBT_NIL, info->xbdev->nodename, | |
281 | "request-abs-pointer", "1"); | |
282 | if (ret) | |
283 | printk(KERN_WARNING | |
284 | "xenkbd: can't request abs-pointer"); | |
285 | } | |
286 | xenbus_switch_state(dev, XenbusStateConnected); | |
287 | break; | |
288 | ||
289 | case XenbusStateConnected: | |
290 | /* | |
291 | * Work around xenbus race condition: If backend goes | |
292 | * through InitWait to Connected fast enough, we can | |
293 | * get Connected twice here. | |
294 | */ | |
295 | if (dev->state != XenbusStateConnected) | |
296 | goto InitWait; /* no InitWait seen yet, fudge it */ | |
297 | break; | |
298 | ||
299 | case XenbusStateClosing: | |
300 | xenbus_frontend_closed(dev); | |
301 | break; | |
302 | } | |
303 | } | |
304 | ||
305 | static struct xenbus_device_id xenkbd_ids[] = { | |
306 | { "vkbd" }, | |
307 | { "" } | |
308 | }; | |
309 | ||
310 | static struct xenbus_driver xenkbd = { | |
311 | .name = "vkbd", | |
312 | .owner = THIS_MODULE, | |
313 | .ids = xenkbd_ids, | |
314 | .probe = xenkbd_probe, | |
315 | .remove = xenkbd_remove, | |
316 | .resume = xenkbd_resume, | |
317 | .otherend_changed = xenkbd_backend_changed, | |
318 | }; | |
319 | ||
320 | static int __init xenkbd_init(void) | |
321 | { | |
322 | if (!is_running_on_xen()) | |
323 | return -ENODEV; | |
324 | ||
325 | /* Nothing to do if running in dom0. */ | |
326 | if (is_initial_xendomain()) | |
327 | return -ENODEV; | |
328 | ||
329 | return xenbus_register_frontend(&xenkbd); | |
330 | } | |
331 | ||
332 | static void __exit xenkbd_cleanup(void) | |
333 | { | |
334 | xenbus_unregister_driver(&xenkbd); | |
335 | } | |
336 | ||
337 | module_init(xenkbd_init); | |
338 | module_exit(xenkbd_cleanup); | |
339 | ||
340 | MODULE_LICENSE("GPL"); |