1 /*
2 * This work is licensed under the terms of the GNU GPL, version 2 or
3 * (at your option) any later version. See the COPYING file in the
4 * top-level directory.
5 */
6
7 #include "qemu/osdep.h"
8 #include "qapi/error.h"
9 #include "qemu/config-file.h"
10 #include "qemu/main-loop.h"
11 #include "qemu/module.h"
12 #include "qemu/sockets.h"
13 #include "ui/input.h"
14 #include "qom/object_interfaces.h"
15 #include "system/iothread.h"
16 #include "block/aio.h"
17
18 #include <sys/ioctl.h>
19 #include "standard-headers/linux/input.h"
20 #include "qom/object.h"
21
linux_is_button(unsigned int lnx)22 static bool linux_is_button(unsigned int lnx)
23 {
24 if (lnx < 0x100) {
25 return false;
26 }
27 if (lnx >= 0x160 && lnx < 0x2c0) {
28 return false;
29 }
30 return true;
31 }
32
33 #define TYPE_INPUT_LINUX "input-linux"
34 OBJECT_DECLARE_SIMPLE_TYPE(InputLinux,
35 INPUT_LINUX)
36
37
38 struct InputLinux {
39 Object parent;
40
41 char *evdev;
42 int fd;
43 bool repeat;
44 bool grab_request;
45 bool grab_active;
46 bool grab_all;
47 bool keydown[KEY_CNT];
48 int keycount;
49 int wheel;
50 bool initialized;
51
52 bool has_rel_x;
53 bool has_abs_x;
54 int num_keys;
55 int num_btns;
56 int abs_x_min;
57 int abs_x_max;
58 int abs_y_min;
59 int abs_y_max;
60 struct input_event event;
61 int read_offset;
62
63 enum GrabToggleKeys grab_toggle;
64
65 QTAILQ_ENTRY(InputLinux) next;
66 };
67
68
69 static QTAILQ_HEAD(, InputLinux) inputs = QTAILQ_HEAD_INITIALIZER(inputs);
70
input_linux_toggle_grab(InputLinux * il)71 static void input_linux_toggle_grab(InputLinux *il)
72 {
73 intptr_t request = !il->grab_active;
74 InputLinux *item;
75 int rc;
76
77 rc = ioctl(il->fd, EVIOCGRAB, request);
78 if (rc < 0) {
79 return;
80 }
81 il->grab_active = !il->grab_active;
82
83 if (!il->grab_all) {
84 return;
85 }
86 QTAILQ_FOREACH(item, &inputs, next) {
87 if (item == il || item->grab_all) {
88 /* avoid endless loops */
89 continue;
90 }
91 if (item->grab_active != il->grab_active) {
92 input_linux_toggle_grab(item);
93 }
94 }
95 }
96
input_linux_check_toggle(InputLinux * il)97 static bool input_linux_check_toggle(InputLinux *il)
98 {
99 switch (il->grab_toggle) {
100 case GRAB_TOGGLE_KEYS_CTRL_CTRL:
101 return il->keydown[KEY_LEFTCTRL] &&
102 il->keydown[KEY_RIGHTCTRL];
103
104 case GRAB_TOGGLE_KEYS_ALT_ALT:
105 return il->keydown[KEY_LEFTALT] &&
106 il->keydown[KEY_RIGHTALT];
107
108 case GRAB_TOGGLE_KEYS_SHIFT_SHIFT:
109 return il->keydown[KEY_LEFTSHIFT] &&
110 il->keydown[KEY_RIGHTSHIFT];
111
112 case GRAB_TOGGLE_KEYS_META_META:
113 return il->keydown[KEY_LEFTMETA] &&
114 il->keydown[KEY_RIGHTMETA];
115
116 case GRAB_TOGGLE_KEYS_SCROLLLOCK:
117 return il->keydown[KEY_SCROLLLOCK];
118
119 case GRAB_TOGGLE_KEYS_CTRL_SCROLLLOCK:
120 return (il->keydown[KEY_LEFTCTRL] ||
121 il->keydown[KEY_RIGHTCTRL]) &&
122 il->keydown[KEY_SCROLLLOCK];
123
124 case GRAB_TOGGLE_KEYS__MAX:
125 /* avoid gcc error */
126 break;
127 }
128 return false;
129 }
130
input_linux_should_skip(InputLinux * il,struct input_event * event)131 static bool input_linux_should_skip(InputLinux *il,
132 struct input_event *event)
133 {
134 return (il->grab_toggle == GRAB_TOGGLE_KEYS_SCROLLLOCK ||
135 il->grab_toggle == GRAB_TOGGLE_KEYS_CTRL_SCROLLLOCK) &&
136 event->code == KEY_SCROLLLOCK;
137 }
138
input_linux_handle_keyboard(InputLinux * il,struct input_event * event)139 static void input_linux_handle_keyboard(InputLinux *il,
140 struct input_event *event)
141 {
142 if (event->type == EV_KEY) {
143 if (event->value > 2 || (event->value > 1 && !il->repeat)) {
144 /*
145 * ignore autorepeat + unknown key events
146 * 0 == up, 1 == down, 2 == autorepeat, other == undefined
147 */
148 return;
149 }
150 if (event->code >= KEY_CNT) {
151 /*
152 * Should not happen. But better safe than sorry,
153 * and we make Coverity happy too.
154 */
155 return;
156 }
157
158 /* keep track of key state */
159 if (!il->keydown[event->code] && event->value) {
160 il->keydown[event->code] = true;
161 il->keycount++;
162 }
163 if (il->keydown[event->code] && !event->value) {
164 il->keydown[event->code] = false;
165 il->keycount--;
166 }
167
168 /* send event to guest when grab is active */
169 if (il->grab_active && !input_linux_should_skip(il, event)) {
170 int qcode = qemu_input_linux_to_qcode(event->code);
171 qemu_input_event_send_key_qcode(NULL, qcode, event->value);
172 }
173
174 /* hotkey -> record switch request ... */
175 if (input_linux_check_toggle(il)) {
176 il->grab_request = true;
177 }
178
179 /*
180 * ... and do the switch when all keys are lifted, so we
181 * confuse neither guest nor host with keys which seem to
182 * be stuck due to missing key-up events.
183 */
184 if (il->grab_request && !il->keycount) {
185 il->grab_request = false;
186 input_linux_toggle_grab(il);
187 }
188 }
189 }
190
input_linux_event_mouse_button(int button)191 static void input_linux_event_mouse_button(int button)
192 {
193 qemu_input_queue_btn(NULL, button, true);
194 qemu_input_event_sync();
195 qemu_input_queue_btn(NULL, button, false);
196 qemu_input_event_sync();
197 }
198
input_linux_handle_mouse(InputLinux * il,struct input_event * event)199 static void input_linux_handle_mouse(InputLinux *il, struct input_event *event)
200 {
201 if (!il->grab_active) {
202 return;
203 }
204
205 switch (event->type) {
206 case EV_KEY:
207 switch (event->code) {
208 case BTN_LEFT:
209 qemu_input_queue_btn(NULL, INPUT_BUTTON_LEFT, event->value);
210 break;
211 case BTN_RIGHT:
212 qemu_input_queue_btn(NULL, INPUT_BUTTON_RIGHT, event->value);
213 break;
214 case BTN_MIDDLE:
215 qemu_input_queue_btn(NULL, INPUT_BUTTON_MIDDLE, event->value);
216 break;
217 case BTN_GEAR_UP:
218 qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_UP, event->value);
219 break;
220 case BTN_GEAR_DOWN:
221 qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_DOWN,
222 event->value);
223 break;
224 case BTN_SIDE:
225 qemu_input_queue_btn(NULL, INPUT_BUTTON_SIDE, event->value);
226 break;
227 case BTN_EXTRA:
228 qemu_input_queue_btn(NULL, INPUT_BUTTON_EXTRA, event->value);
229 break;
230 };
231 break;
232 case EV_REL:
233 switch (event->code) {
234 case REL_X:
235 qemu_input_queue_rel(NULL, INPUT_AXIS_X, event->value);
236 break;
237 case REL_Y:
238 qemu_input_queue_rel(NULL, INPUT_AXIS_Y, event->value);
239 break;
240 case REL_WHEEL:
241 il->wheel = event->value;
242 break;
243 }
244 break;
245 case EV_ABS:
246 switch (event->code) {
247 case ABS_X:
248 qemu_input_queue_abs(NULL, INPUT_AXIS_X, event->value,
249 il->abs_x_min, il->abs_x_max);
250 break;
251 case ABS_Y:
252 qemu_input_queue_abs(NULL, INPUT_AXIS_Y, event->value,
253 il->abs_y_min, il->abs_y_max);
254 break;
255 }
256 break;
257 case EV_SYN:
258 qemu_input_event_sync();
259 if (il->wheel != 0) {
260 input_linux_event_mouse_button((il->wheel > 0)
261 ? INPUT_BUTTON_WHEEL_UP
262 : INPUT_BUTTON_WHEEL_DOWN);
263 il->wheel = 0;
264 }
265 break;
266 }
267 }
268
input_linux_event(void * opaque)269 static void input_linux_event(void *opaque)
270 {
271 InputLinux *il = opaque;
272 int rc;
273 int read_size;
274 uint8_t *p = (uint8_t *)&il->event;
275
276 for (;;) {
277 read_size = sizeof(il->event) - il->read_offset;
278 rc = read(il->fd, &p[il->read_offset], read_size);
279 if (rc != read_size) {
280 if (rc < 0 && errno != EAGAIN) {
281 fprintf(stderr, "%s: read: %s\n", __func__, strerror(errno));
282 qemu_set_fd_handler(il->fd, NULL, NULL, NULL);
283 close(il->fd);
284 } else if (rc > 0) {
285 il->read_offset += rc;
286 }
287 break;
288 }
289 il->read_offset = 0;
290
291 if (il->num_keys) {
292 input_linux_handle_keyboard(il, &il->event);
293 }
294 if ((il->has_rel_x || il->has_abs_x) && il->num_btns) {
295 input_linux_handle_mouse(il, &il->event);
296 }
297 }
298 }
299
input_linux_complete(UserCreatable * uc,Error ** errp)300 static void input_linux_complete(UserCreatable *uc, Error **errp)
301 {
302 InputLinux *il = INPUT_LINUX(uc);
303 uint8_t evtmap, relmap, absmap;
304 uint8_t keymap[KEY_CNT / 8], keystate[KEY_CNT / 8];
305 unsigned int i;
306 int rc, ver;
307 struct input_absinfo absinfo;
308
309 if (!il->evdev) {
310 error_setg(errp, "no input device specified");
311 return;
312 }
313
314 il->fd = open(il->evdev, O_RDWR);
315 if (il->fd < 0) {
316 error_setg_file_open(errp, errno, il->evdev);
317 return;
318 }
319 if (!g_unix_set_fd_nonblocking(il->fd, true, NULL)) {
320 error_setg_errno(errp, errno, "Failed to set FD nonblocking");
321 return;
322 }
323
324 rc = ioctl(il->fd, EVIOCGVERSION, &ver);
325 if (rc < 0) {
326 error_setg(errp, "%s: is not an evdev device", il->evdev);
327 goto err_close;
328 }
329
330 rc = ioctl(il->fd, EVIOCGBIT(0, sizeof(evtmap)), &evtmap);
331 if (rc < 0) {
332 goto err_read_event_bits;
333 }
334
335 if (evtmap & (1 << EV_REL)) {
336 relmap = 0;
337 rc = ioctl(il->fd, EVIOCGBIT(EV_REL, sizeof(relmap)), &relmap);
338 if (rc < 0) {
339 goto err_read_event_bits;
340 }
341 if (relmap & (1 << REL_X)) {
342 il->has_rel_x = true;
343 }
344 }
345
346 if (evtmap & (1 << EV_ABS)) {
347 absmap = 0;
348 rc = ioctl(il->fd, EVIOCGBIT(EV_ABS, sizeof(absmap)), &absmap);
349 if (rc < 0) {
350 goto err_read_event_bits;
351 }
352 if (absmap & (1 << ABS_X)) {
353 il->has_abs_x = true;
354 rc = ioctl(il->fd, EVIOCGABS(ABS_X), &absinfo);
355 if (rc < 0) {
356 error_setg(errp, "%s: failed to get get absolute X value",
357 il->evdev);
358 goto err_close;
359 }
360 il->abs_x_min = absinfo.minimum;
361 il->abs_x_max = absinfo.maximum;
362 rc = ioctl(il->fd, EVIOCGABS(ABS_Y), &absinfo);
363 if (rc < 0) {
364 error_setg(errp, "%s: failed to get get absolute Y value",
365 il->evdev);
366 goto err_close;
367 }
368 il->abs_y_min = absinfo.minimum;
369 il->abs_y_max = absinfo.maximum;
370 }
371 }
372
373 if (evtmap & (1 << EV_KEY)) {
374 memset(keymap, 0, sizeof(keymap));
375 rc = ioctl(il->fd, EVIOCGBIT(EV_KEY, sizeof(keymap)), keymap);
376 if (rc < 0) {
377 goto err_read_event_bits;
378 }
379 rc = ioctl(il->fd, EVIOCGKEY(sizeof(keystate)), keystate);
380 if (rc < 0) {
381 error_setg(errp, "%s: failed to get global key state", il->evdev);
382 goto err_close;
383 }
384 for (i = 0; i < KEY_CNT; i++) {
385 if (keymap[i / 8] & (1 << (i % 8))) {
386 if (linux_is_button(i)) {
387 il->num_btns++;
388 } else {
389 il->num_keys++;
390 }
391 if (keystate[i / 8] & (1 << (i % 8))) {
392 il->keydown[i] = true;
393 il->keycount++;
394 }
395 }
396 }
397 }
398
399 qemu_set_fd_handler(il->fd, input_linux_event, NULL, il);
400 if (il->keycount) {
401 /* delay grab until all keys are released */
402 il->grab_request = true;
403 } else {
404 input_linux_toggle_grab(il);
405 }
406 QTAILQ_INSERT_TAIL(&inputs, il, next);
407 il->initialized = true;
408 return;
409
410 err_read_event_bits:
411 error_setg(errp, "%s: failed to read event bits", il->evdev);
412
413 err_close:
414 close(il->fd);
415 }
416
input_linux_instance_finalize(Object * obj)417 static void input_linux_instance_finalize(Object *obj)
418 {
419 InputLinux *il = INPUT_LINUX(obj);
420
421 if (il->initialized) {
422 QTAILQ_REMOVE(&inputs, il, next);
423 qemu_set_fd_handler(il->fd, NULL, NULL, NULL);
424 close(il->fd);
425 }
426 g_free(il->evdev);
427 }
428
input_linux_get_evdev(Object * obj,Error ** errp)429 static char *input_linux_get_evdev(Object *obj, Error **errp)
430 {
431 InputLinux *il = INPUT_LINUX(obj);
432
433 return g_strdup(il->evdev);
434 }
435
input_linux_set_evdev(Object * obj,const char * value,Error ** errp)436 static void input_linux_set_evdev(Object *obj, const char *value,
437 Error **errp)
438 {
439 InputLinux *il = INPUT_LINUX(obj);
440
441 if (il->evdev) {
442 error_setg(errp, "evdev property already set");
443 return;
444 }
445 il->evdev = g_strdup(value);
446 }
447
input_linux_get_grab_all(Object * obj,Error ** errp)448 static bool input_linux_get_grab_all(Object *obj, Error **errp)
449 {
450 InputLinux *il = INPUT_LINUX(obj);
451
452 return il->grab_all;
453 }
454
input_linux_set_grab_all(Object * obj,bool value,Error ** errp)455 static void input_linux_set_grab_all(Object *obj, bool value,
456 Error **errp)
457 {
458 InputLinux *il = INPUT_LINUX(obj);
459
460 il->grab_all = value;
461 }
462
input_linux_get_repeat(Object * obj,Error ** errp)463 static bool input_linux_get_repeat(Object *obj, Error **errp)
464 {
465 InputLinux *il = INPUT_LINUX(obj);
466
467 return il->repeat;
468 }
469
input_linux_set_repeat(Object * obj,bool value,Error ** errp)470 static void input_linux_set_repeat(Object *obj, bool value,
471 Error **errp)
472 {
473 InputLinux *il = INPUT_LINUX(obj);
474
475 il->repeat = value;
476 }
477
input_linux_get_grab_toggle(Object * obj,Error ** errp)478 static int input_linux_get_grab_toggle(Object *obj, Error **errp)
479 {
480 InputLinux *il = INPUT_LINUX(obj);
481
482 return il->grab_toggle;
483 }
484
input_linux_set_grab_toggle(Object * obj,int value,Error ** errp)485 static void input_linux_set_grab_toggle(Object *obj, int value,
486 Error **errp)
487 {
488 InputLinux *il = INPUT_LINUX(obj);
489
490 il->grab_toggle = value;
491 }
492
input_linux_instance_init(Object * obj)493 static void input_linux_instance_init(Object *obj)
494 {
495 }
496
input_linux_class_init(ObjectClass * oc,const void * data)497 static void input_linux_class_init(ObjectClass *oc, const void *data)
498 {
499 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
500
501 ucc->complete = input_linux_complete;
502
503 object_class_property_add_str(oc, "evdev",
504 input_linux_get_evdev,
505 input_linux_set_evdev);
506 object_class_property_add_bool(oc, "grab_all",
507 input_linux_get_grab_all,
508 input_linux_set_grab_all);
509 object_class_property_add_bool(oc, "repeat",
510 input_linux_get_repeat,
511 input_linux_set_repeat);
512 object_class_property_add_enum(oc, "grab-toggle", "GrabToggleKeys",
513 &GrabToggleKeys_lookup,
514 input_linux_get_grab_toggle,
515 input_linux_set_grab_toggle);
516 }
517
518 static const TypeInfo input_linux_info = {
519 .name = TYPE_INPUT_LINUX,
520 .parent = TYPE_OBJECT,
521 .class_init = input_linux_class_init,
522 .instance_size = sizeof(InputLinux),
523 .instance_init = input_linux_instance_init,
524 .instance_finalize = input_linux_instance_finalize,
525 .interfaces = (const InterfaceInfo[]) {
526 { TYPE_USER_CREATABLE },
527 { }
528 }
529 };
530
register_types(void)531 static void register_types(void)
532 {
533 type_register_static(&input_linux_info);
534 }
535
536 type_init(register_types);
537