hw/hid.c

   1 /*
   2  * QEMU HID devices
   3  *
   4  * Copyright (c) 2005 Fabrice Bellard
   5  * Copyright (c) 2007 OpenMoko, Inc.  (andrew@openedhand.com)
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "hw.h"
  26 #include "console.h"
  27 #include "qemu-timer.h"
  28 #include "hid.h"
  29
  30 #define HID_USAGE_ERROR_ROLLOVER        0x01
  31 #define HID_USAGE_POSTFAIL              0x02
  32 #define HID_USAGE_ERROR_UNDEFINED       0x03
  33
  34 /* Indices are QEMU keycodes, values are from HID Usage Table.  Indices
  35  * above 0x80 are for keys that come after 0xe0 or 0xe1+0x1d or 0xe1+0x9d.  */
  36 static const uint8_t hid_usage_keys[0x100] = {
  37     0x00, 0x29, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
  38     0x24, 0x25, 0x26, 0x27, 0x2d, 0x2e, 0x2a, 0x2b,
  39     0x14, 0x1a, 0x08, 0x15, 0x17, 0x1c, 0x18, 0x0c,
  40     0x12, 0x13, 0x2f, 0x30, 0x28, 0xe0, 0x04, 0x16,
  41     0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x0f, 0x33,
  42     0x34, 0x35, 0xe1, 0x31, 0x1d, 0x1b, 0x06, 0x19,
  43     0x05, 0x11, 0x10, 0x36, 0x37, 0x38, 0xe5, 0x55,
  44     0xe2, 0x2c, 0x32, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
  45     0x3f, 0x40, 0x41, 0x42, 0x43, 0x53, 0x47, 0x5f,
  46     0x60, 0x61, 0x56, 0x5c, 0x5d, 0x5e, 0x57, 0x59,
  47     0x5a, 0x5b, 0x62, 0x63, 0x00, 0x00, 0x00, 0x44,
  48     0x45, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
  49     0xe8, 0xe9, 0x71, 0x72, 0x73, 0x00, 0x00, 0x00,
  50     0x00, 0x00, 0x00, 0x85, 0x00, 0x00, 0x00, 0x00,
  51     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  52     0x00, 0x00, 0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65,
  53
  54     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  55     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  56     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  57     0x00, 0x00, 0x00, 0x00, 0x58, 0xe4, 0x00, 0x00,
  58     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  59     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  60     0x00, 0x00, 0x00, 0x00, 0x00, 0x54, 0x00, 0x46,
  61     0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  62     0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x4a,
  63     0x52, 0x4b, 0x00, 0x50, 0x00, 0x4f, 0x00, 0x4d,
  64     0x51, 0x4e, 0x49, 0x4c, 0x00, 0x00, 0x00, 0x00,
  65     0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65, 0x00, 0x00,
  66     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  67     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  68     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  69     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  70 };
  71
  72 bool hid_has_events(HIDState *hs)
  73 {
  74     return hs->n > 0;
  75 }
  76
  77 void hid_set_next_idle(HIDState *hs, int64_t curtime)
  78 {
  79     hs->next_idle_clock = curtime + (get_ticks_per_sec() * hs->idle * 4) / 1000;
  80 }
  81
  82 static void hid_pointer_event_clear(HIDPointerEvent *e, int buttons)
  83 {
  84     e->xdx = e->ydy = e->dz = 0;
  85     e->buttons_state = buttons;
  86 }
  87
  88 static void hid_pointer_event_combine(HIDPointerEvent *e, int xyrel,
  89                                       int x1, int y1, int z1) {
  90     if (xyrel) {
  91         e->xdx += x1;
  92         e->ydy += y1;
  93     } else {
  94         e->xdx = x1;
  95         e->ydy = y1;
  96         /* Windows drivers do not like the 0/0 position and ignore such
  97          * events. */
  98         if (!(x1 | y1)) {
  99             x1 = 1;
 100         }
 101     }
 102     e->dz += z1;
 103 }
 104
 105 static void hid_pointer_event(void *opaque,
 106                               int x1, int y1, int z1, int buttons_state)
 107 {
 108     HIDState *hs = opaque;
 109     unsigned use_slot = (hs->head + hs->n - 1) & QUEUE_MASK;
 110     unsigned previous_slot = (use_slot - 1) & QUEUE_MASK;
 111
 112     /* We combine events where feasible to keep the queue small.  We shouldn't
 113      * combine anything with the first event of a particular button state, as
 114      * that would change the location of the button state change.  When the
 115      * queue is empty, a second event is needed because we don't know if
 116      * the first event changed the button state.  */
 117     if (hs->n == QUEUE_LENGTH) {
 118         /* Queue full.  Discard old button state, combine motion normally.  */
 119         hs->ptr.queue[use_slot].buttons_state = buttons_state;
 120     } else if (hs->n < 2 ||
 121                hs->ptr.queue[use_slot].buttons_state != buttons_state ||
 122                hs->ptr.queue[previous_slot].buttons_state !=
 123                hs->ptr.queue[use_slot].buttons_state) {
 124         /* Cannot or should not combine, so add an empty item to the queue.  */
 125         QUEUE_INCR(use_slot);
 126         hs->n++;
 127         hid_pointer_event_clear(&hs->ptr.queue[use_slot], buttons_state);
 128     }
 129     hid_pointer_event_combine(&hs->ptr.queue[use_slot],
 130                               hs->kind == HID_MOUSE,
 131                               x1, y1, z1);
 132     hs->event(hs);
 133 }
 134
 135 static void hid_keyboard_event(void *opaque, int keycode)
 136 {
 137     HIDState *hs = opaque;
 138     int slot;
 139
 140     if (hs->n == QUEUE_LENGTH) {
 141         fprintf(stderr, "usb-kbd: warning: key event queue full\n");
 142         return;
 143     }
 144     slot = (hs->head + hs->n) & QUEUE_MASK; hs->n++;
 145     hs->kbd.keycodes[slot] = keycode;
 146     hs->event(hs);
 147 }
 148
 149 static void hid_keyboard_process_keycode(HIDState *hs)
 150 {
 151     uint8_t hid_code, key;
 152     int i, keycode, slot;
 153
 154     if (hs->n == 0) {
 155         return;
 156     }
 157     slot = hs->head & QUEUE_MASK; QUEUE_INCR(hs->head); hs->n--;
 158     keycode = hs->kbd.keycodes[slot];
 159
 160     key = keycode & 0x7f;
 161     hid_code = hid_usage_keys[key | ((hs->kbd.modifiers >> 1) & (1 << 7))];
 162     hs->kbd.modifiers &= ~(1 << 8);
 163
 164     switch (hid_code) {
 165     case 0x00:
 166         return;
 167
 168     case 0xe0:
 169         if (hs->kbd.modifiers & (1 << 9)) {
 170             hs->kbd.modifiers ^= 3 << 8;
 171             return;
 172         }
 173     case 0xe1 ... 0xe7:
 174         if (keycode & (1 << 7)) {
 175             hs->kbd.modifiers &= ~(1 << (hid_code & 0x0f));
 176             return;
 177         }
 178     case 0xe8 ... 0xef:
 179         hs->kbd.modifiers |= 1 << (hid_code & 0x0f);
 180         return;
 181     }
 182
 183     if (keycode & (1 << 7)) {
 184         for (i = hs->kbd.keys - 1; i >= 0; i--) {
 185             if (hs->kbd.key[i] == hid_code) {
 186                 hs->kbd.key[i] = hs->kbd.key[-- hs->kbd.keys];
 187                 hs->kbd.key[hs->kbd.keys] = 0x00;
 188                 break;
 189             }
 190         }
 191         if (i < 0) {
 192             return;
 193         }
 194     } else {
 195         for (i = hs->kbd.keys - 1; i >= 0; i--) {
 196             if (hs->kbd.key[i] == hid_code) {
 197                 break;
 198             }
 199         }
 200         if (i < 0) {
 201             if (hs->kbd.keys < sizeof(hs->kbd.key)) {
 202                 hs->kbd.key[hs->kbd.keys++] = hid_code;
 203             }
 204         } else {
 205             return;
 206         }
 207     }
 208 }
 209
 210 static inline int int_clamp(int val, int vmin, int vmax)
 211 {
 212     if (val < vmin) {
 213         return vmin;
 214     } else if (val > vmax) {
 215         return vmax;
 216     } else {
 217         return val;
 218     }
 219 }
 220
 221 int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len)
 222 {
 223     int dx, dy, dz, b, l;
 224     int index;
 225     HIDPointerEvent *e;
 226
 227     if (!hs->ptr.mouse_grabbed) {
 228         qemu_activate_mouse_event_handler(hs->ptr.eh_entry);
 229         hs->ptr.mouse_grabbed = 1;
 230     }
 231
 232     /* When the buffer is empty, return the last event.  Relative
 233        movements will all be zero.  */
 234     index = (hs->n ? hs->head : hs->head - 1);
 235     e = &hs->ptr.queue[index & QUEUE_MASK];
 236
 237     if (hs->kind == HID_MOUSE) {
 238         dx = int_clamp(e->xdx, -127, 127);
 239         dy = int_clamp(e->ydy, -127, 127);
 240         e->xdx -= dx;
 241         e->ydy -= dy;
 242     } else {
 243         dx = e->xdx;
 244         dy = e->ydy;
 245     }
 246     dz = int_clamp(e->dz, -127, 127);
 247     e->dz -= dz;
 248
 249     b = 0;
 250     if (e->buttons_state & MOUSE_EVENT_LBUTTON) {
 251         b |= 0x01;
 252     }
 253     if (e->buttons_state & MOUSE_EVENT_RBUTTON) {
 254         b |= 0x02;
 255     }
 256     if (e->buttons_state & MOUSE_EVENT_MBUTTON) {
 257         b |= 0x04;
 258     }
 259
 260     if (hs->n &&
 261         !e->dz &&
 262         (hs->kind == HID_TABLET || (!e->xdx && !e->ydy))) {
 263         /* that deals with this event */
 264         QUEUE_INCR(hs->head);
 265         hs->n--;
 266     }
 267
 268     /* Appears we have to invert the wheel direction */
 269     dz = 0 - dz;
 270     l = 0;
 271     switch (hs->kind) {
 272     case HID_MOUSE:
 273         if (len > l) {
 274             buf[l++] = b;
 275         }
 276         if (len > l) {
 277             buf[l++] = dx;
 278         }
 279         if (len > l) {
 280             buf[l++] = dy;
 281         }
 282         if (len > l) {
 283             buf[l++] = dz;
 284         }
 285         break;
 286
 287     case HID_TABLET:
 288         if (len > l) {
 289             buf[l++] = b;
 290         }
 291         if (len > l) {
 292             buf[l++] = dx & 0xff;
 293         }
 294         if (len > l) {
 295             buf[l++] = dx >> 8;
 296         }
 297         if (len > l) {
 298             buf[l++] = dy & 0xff;
 299         }
 300         if (len > l) {
 301             buf[l++] = dy >> 8;
 302         }
 303         if (len > l) {
 304             buf[l++] = dz;
 305         }
 306         break;
 307
 308     default:
 309         abort();
 310     }
 311
 312     return l;
 313 }
 314
 315 int hid_keyboard_poll(HIDState *hs, uint8_t *buf, int len)
 316 {
 317     if (len < 2) {
 318         return 0;
 319     }
 320
 321     hid_keyboard_process_keycode(hs);
 322
 323     buf[0] = hs->kbd.modifiers & 0xff;
 324     buf[1] = 0;
 325     if (hs->kbd.keys > 6) {
 326         memset(buf + 2, HID_USAGE_ERROR_ROLLOVER, MIN(8, len) - 2);
 327     } else {
 328         memcpy(buf + 2, hs->kbd.key, MIN(8, len) - 2);
 329     }
 330
 331     return MIN(8, len);
 332 }
 333
 334 int hid_keyboard_write(HIDState *hs, uint8_t *buf, int len)
 335 {
 336     if (len > 0) {
 337         int ledstate = 0;
 338         /* 0x01: Num Lock LED
 339          * 0x02: Caps Lock LED
 340          * 0x04: Scroll Lock LED
 341          * 0x08: Compose LED
 342          * 0x10: Kana LED */
 343         hs->kbd.leds = buf[0];
 344         if (hs->kbd.leds & 0x04) {
 345             ledstate |= QEMU_SCROLL_LOCK_LED;
 346         }
 347         if (hs->kbd.leds & 0x01) {
 348             ledstate |= QEMU_NUM_LOCK_LED;
 349         }
 350         if (hs->kbd.leds & 0x02) {
 351             ledstate |= QEMU_CAPS_LOCK_LED;
 352         }
 353         kbd_put_ledstate(ledstate);
 354     }
 355     return 0;
 356 }
 357
 358 void hid_reset(HIDState *hs)
 359 {
 360     switch (hs->kind) {
 361     case HID_KEYBOARD:
 362         qemu_add_kbd_event_handler(hid_keyboard_event, hs);
 363         memset(hs->kbd.keycodes, 0, sizeof(hs->kbd.keycodes));
 364         memset(hs->kbd.key, 0, sizeof(hs->kbd.key));
 365         hs->kbd.keys = 0;
 366         break;
 367     case HID_MOUSE:
 368     case HID_TABLET:
 369         memset(hs->ptr.queue, 0, sizeof(hs->ptr.queue));
 370         break;
 371     }
 372     hs->head = 0;
 373     hs->n = 0;
 374     hs->protocol = 1;
 375     hs->idle = 0;
 376 }
 377
 378 void hid_free(HIDState *hs)
 379 {
 380     switch (hs->kind) {
 381     case HID_KEYBOARD:
 382         qemu_remove_kbd_event_handler();
 383         break;
 384     case HID_MOUSE:
 385     case HID_TABLET:
 386         qemu_remove_mouse_event_handler(hs->ptr.eh_entry);
 387         break;
 388     }
 389 }
 390
 391 void hid_init(HIDState *hs, int kind, HIDEventFunc event)
 392 {
 393     hs->kind = kind;
 394     hs->event = event;
 395
 396     if (hs->kind == HID_MOUSE) {
 397         hs->ptr.eh_entry = qemu_add_mouse_event_handler(hid_pointer_event, hs,
 398                                                         0, "QEMU HID Mouse");
 399     } else if (hs->kind == HID_TABLET) {
 400         hs->ptr.eh_entry = qemu_add_mouse_event_handler(hid_pointer_event, hs,
 401                                                         1, "QEMU HID Tablet");
 402     }
 403 }