ui/input-linux.c

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