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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#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 * Note: if you need to send out events, see xenfb_do_update() for how
50 * to do that.
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(); /* 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);
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(); /* ensure we got ring contents */
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 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 }
140
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;
150
151 __set_bit(EV_KEY, kbd->evbit);
152 for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
153 __set_bit(i, kbd->keybit);
154 for (i = KEY_OK; i < KEY_MAX; i++)
155 __set_bit(i, kbd->keybit);
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;
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);
186 for (i = BTN_LEFT; i <= BTN_TASK; i++)
187 __set_bit(i, ptr->keybit);
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
211static int xenkbd_resume(struct xenbus_device *dev)
212{
213 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
214
215 xenkbd_disconnect_backend(info);
216 memset(info->page, 0, PAGE_SIZE);
217 return xenkbd_connect_backend(dev, info);
218}
219
220static int xenkbd_remove(struct xenbus_device *dev)
221{
222 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
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
234static int xenkbd_connect_backend(struct xenbus_device *dev,
235 struct xenkbd_info *info)
236{
237 int ret, evtchn;
238 struct xenbus_transaction xbt;
239
240 ret = gnttab_grant_foreign_access(dev->otherend_id,
241 virt_to_gfn(info->page), 0);
242 if (ret < 0)
243 return ret;
244 info->gref = ret;
245
246 ret = xenbus_alloc_evtchn(dev, &evtchn);
247 if (ret)
248 goto error_grant;
249 ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
250 0, dev->devicetype, info);
251 if (ret < 0) {
252 xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
253 goto error_evtchan;
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");
261 goto error_irqh;
262 }
263 ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
264 virt_to_gfn(info->page));
265 if (ret)
266 goto error_xenbus;
267 ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref);
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");
279 goto error_irqh;
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");
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:
294 gnttab_end_foreign_access(info->gref, 0, 0UL);
295 info->gref = -1;
296 return ret;
297}
298
299static 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;
304 if (info->gref >= 0)
305 gnttab_end_foreign_access(info->gref, 0, 0UL);
306 info->gref = -1;
307}
308
309static void xenkbd_backend_changed(struct xenbus_device *dev,
310 enum xenbus_state backend_state)
311{
312 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
313 int ret, val;
314
315 switch (backend_state) {
316 case XenbusStateInitialising:
317 case XenbusStateInitialised:
318 case XenbusStateReconfiguring:
319 case XenbusStateReconfigured:
320 case XenbusStateUnknown:
321 break;
322
323 case XenbusStateInitWait:
324InitWait:
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
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 */
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
357 break;
358
359 case XenbusStateClosed:
360 if (dev->state == XenbusStateClosed)
361 break;
362 /* Missed the backend's CLOSING state -- fallthrough */
363 case XenbusStateClosing:
364 xenbus_frontend_closed(dev);
365 break;
366 }
367}
368
369static const struct xenbus_device_id xenkbd_ids[] = {
370 { "vkbd" },
371 { "" }
372};
373
374static struct xenbus_driver xenkbd_driver = {
375 .ids = xenkbd_ids,
376 .probe = xenkbd_probe,
377 .remove = xenkbd_remove,
378 .resume = xenkbd_resume,
379 .otherend_changed = xenkbd_backend_changed,
380};
381
382static int __init xenkbd_init(void)
383{
384 if (!xen_domain())
385 return -ENODEV;
386
387 /* Nothing to do if running in dom0. */
388 if (xen_initial_domain())
389 return -ENODEV;
390
391 if (!xen_has_pv_devices())
392 return -ENODEV;
393
394 return xenbus_register_frontend(&xenkbd_driver);
395}
396
397static void __exit xenkbd_cleanup(void)
398{
399 xenbus_unregister_driver(&xenkbd_driver);
400}
401
402module_init(xenkbd_init);
403module_exit(xenkbd_cleanup);
404
405MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
406MODULE_LICENSE("GPL");
407MODULE_ALIAS("xen:vkbd");
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#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 * Note: if you need to send out events, see xenfb_do_update() for how
50 * to do that.
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(); /* 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);
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(); /* ensure we got ring contents */
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;
112 unsigned int abs;
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 }
121 dev_set_drvdata(&dev->dev, info);
122 info->xbdev = dev;
123 info->irq = -1;
124 info->gref = -1;
125 snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
126
127 info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
128 if (!info->page)
129 goto error_nomem;
130
131 abs = xenbus_read_unsigned(dev->otherend, "feature-abs-pointer", 0);
132 if (abs) {
133 ret = xenbus_write(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 }
140
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;
150
151 __set_bit(EV_KEY, kbd->evbit);
152 for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
153 __set_bit(i, kbd->keybit);
154 for (i = KEY_OK; i < KEY_MAX; i++)
155 __set_bit(i, kbd->keybit);
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;
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);
186 for (i = BTN_LEFT; i <= BTN_TASK; i++)
187 __set_bit(i, ptr->keybit);
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
211static int xenkbd_resume(struct xenbus_device *dev)
212{
213 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
214
215 xenkbd_disconnect_backend(info);
216 memset(info->page, 0, PAGE_SIZE);
217 return xenkbd_connect_backend(dev, info);
218}
219
220static int xenkbd_remove(struct xenbus_device *dev)
221{
222 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
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
234static int xenkbd_connect_backend(struct xenbus_device *dev,
235 struct xenkbd_info *info)
236{
237 int ret, evtchn;
238 struct xenbus_transaction xbt;
239
240 ret = gnttab_grant_foreign_access(dev->otherend_id,
241 virt_to_gfn(info->page), 0);
242 if (ret < 0)
243 return ret;
244 info->gref = ret;
245
246 ret = xenbus_alloc_evtchn(dev, &evtchn);
247 if (ret)
248 goto error_grant;
249 ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
250 0, dev->devicetype, info);
251 if (ret < 0) {
252 xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
253 goto error_evtchan;
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");
261 goto error_irqh;
262 }
263 ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
264 virt_to_gfn(info->page));
265 if (ret)
266 goto error_xenbus;
267 ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref);
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");
279 goto error_irqh;
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");
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:
294 gnttab_end_foreign_access(info->gref, 0, 0UL);
295 info->gref = -1;
296 return ret;
297}
298
299static 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;
304 if (info->gref >= 0)
305 gnttab_end_foreign_access(info->gref, 0, 0UL);
306 info->gref = -1;
307}
308
309static void xenkbd_backend_changed(struct xenbus_device *dev,
310 enum xenbus_state backend_state)
311{
312 struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
313 int ret, val;
314
315 switch (backend_state) {
316 case XenbusStateInitialising:
317 case XenbusStateInitialised:
318 case XenbusStateReconfiguring:
319 case XenbusStateReconfigured:
320 case XenbusStateUnknown:
321 break;
322
323 case XenbusStateInitWait:
324InitWait:
325 if (xenbus_read_unsigned(info->xbdev->otherend,
326 "feature-abs-pointer", 0)) {
327 ret = xenbus_write(XBT_NIL, info->xbdev->nodename,
328 "request-abs-pointer", "1");
329 if (ret)
330 pr_warning("xenkbd: can't request abs-pointer");
331 }
332
333 xenbus_switch_state(dev, XenbusStateConnected);
334 break;
335
336 case XenbusStateConnected:
337 /*
338 * Work around xenbus race condition: If backend goes
339 * through InitWait to Connected fast enough, we can
340 * get Connected twice here.
341 */
342 if (dev->state != XenbusStateConnected)
343 goto InitWait; /* no InitWait seen yet, fudge it */
344
345 /* Set input abs params to match backend screen res */
346 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
347 "width", "%d", &val) > 0)
348 input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
349
350 if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
351 "height", "%d", &val) > 0)
352 input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
353
354 break;
355
356 case XenbusStateClosed:
357 if (dev->state == XenbusStateClosed)
358 break;
359 /* Missed the backend's CLOSING state -- fallthrough */
360 case XenbusStateClosing:
361 xenbus_frontend_closed(dev);
362 break;
363 }
364}
365
366static const struct xenbus_device_id xenkbd_ids[] = {
367 { "vkbd" },
368 { "" }
369};
370
371static struct xenbus_driver xenkbd_driver = {
372 .ids = xenkbd_ids,
373 .probe = xenkbd_probe,
374 .remove = xenkbd_remove,
375 .resume = xenkbd_resume,
376 .otherend_changed = xenkbd_backend_changed,
377};
378
379static int __init xenkbd_init(void)
380{
381 if (!xen_domain())
382 return -ENODEV;
383
384 /* Nothing to do if running in dom0. */
385 if (xen_initial_domain())
386 return -ENODEV;
387
388 if (!xen_has_pv_devices())
389 return -ENODEV;
390
391 return xenbus_register_frontend(&xenkbd_driver);
392}
393
394static void __exit xenkbd_cleanup(void)
395{
396 xenbus_unregister_driver(&xenkbd_driver);
397}
398
399module_init(xenkbd_init);
400module_exit(xenkbd_cleanup);
401
402MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
403MODULE_LICENSE("GPL");
404MODULE_ALIAS("xen:vkbd");