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1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1754 jermar 29
/** @addtogroup genarch
1702 cejka 30
 * @{
31
 */
1754 jermar 32
/**
1757 jermar 33
 * @file
1754 jermar 34
 * @brief   i8042 processor driver.
35
 *
36
 * It takes care of low-level keyboard functions.
1702 cejka 37
 */
38
 
894 jermar 39
#include <genarch/i8042/i8042.h>
40
#include <arch/drivers/i8042.h>
1 jermar 41
#include <arch/interrupt.h>
42
#include <cpu.h>
43
#include <arch/asm.h>
44
#include <arch.h>
508 jermar 45
#include <synch/spinlock.h>
46
#include <typedefs.h>
511 jermar 47
#include <console/chardev.h>
48
#include <console/console.h>
517 jermar 49
#include <macros.h>
576 palkovsky 50
#include <interrupt.h>
1 jermar 51
 
1754 jermar 52
/* Keyboard commands. */
512 jermar 53
#define KBD_ENABLE  0xf4
54
#define KBD_DISABLE 0xf5
55
#define KBD_ACK     0xfa
56
 
670 vana 57
/*
893 jermar 58
 * 60  Write 8042 Command Byte: next data byte written to port 60h is
895 jermar 59
 *     placed in 8042 command register. Format:
893 jermar 60
 *
61
 *    |7|6|5|4|3|2|1|0|8042 Command Byte
62
 *     | | | | | | | `---- 1=enable output register full interrupt
63
 *     | | | | | | `----- should be 0
64
 *     | | | | | `------ 1=set status register system, 0=clear
65
 *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
66
 *     | | | `-------- disable keyboard I/O by driving clock line low
67
 *     | | `--------- disable auxiliary device, drives clock line low
68
 *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
69
 *     `----------- reserved, should be 0
70
 */
670 vana 71
 
893 jermar 72
#define i8042_SET_COMMAND   0x60
1759 palkovsky 73
#define i8042_COMMAND       0x69
894 jermar 74
 
75
#define i8042_BUFFER_FULL_MASK  0x01
893 jermar 76
#define i8042_WAIT_MASK     0x02
1759 palkovsky 77
#define i8042_MOUSE_DATA        0x20
670 vana 78
 
508 jermar 79
#define SPECIAL     '?'
80
#define KEY_RELEASE 0x80
81
 
895 jermar 82
/**
83
 * These codes read from i8042 data register are silently ignored.
84
 */
85
#define IGNORE_CODE 0x7f
86
 
1780 jermar 87
static void key_released(uint8_t sc);
88
static void key_pressed(uint8_t sc);
878 vana 89
static char key_read(chardev_t *d);
508 jermar 90
 
91
#define PRESSED_SHIFT       (1<<0)
92
#define PRESSED_CAPSLOCK    (1<<1)
93
#define LOCKED_CAPSLOCK     (1<<0)
94
 
894 jermar 95
#define ACTIVE_READ_BUFF_SIZE 16    /* Must be power of 2 */
878 vana 96
 
1780 jermar 97
static uint8_t active_read_buff[ACTIVE_READ_BUFF_SIZE];
878 vana 98
 
623 jermar 99
SPINLOCK_INITIALIZE(keylock);       /**< keylock protects keyflags and lockflags. */
508 jermar 100
static volatile int keyflags;       /**< Tracking of multiple keypresses. */
509 jermar 101
static volatile int lockflags;      /**< Tracking of multiple keys lockings. */
508 jermar 102
 
575 palkovsky 103
static void i8042_suspend(chardev_t *);
104
static void i8042_resume(chardev_t *);
511 jermar 105
 
106
static chardev_t kbrd;
107
static chardev_operations_t ops = {
108
    .suspend = i8042_suspend,
878 vana 109
    .resume = i8042_resume,
110
    .read = key_read
511 jermar 111
};
112
 
508 jermar 113
/** Primary meaning of scancodes. */
114
static char sc_primary_map[] = {
115
    SPECIAL, /* 0x00 */
116
    SPECIAL, /* 0x01 - Esc */
117
    '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
588 palkovsky 118
    '\b', /* 0x0e - Backspace */
508 jermar 119
    '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
120
    SPECIAL, /* 0x1d - LCtrl */
121
    'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
122
    '`',
123
    SPECIAL, /* 0x2a - LShift */
124
    '\\',
125
    'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
126
    SPECIAL, /* 0x36 - RShift */
127
    '*',
128
    SPECIAL, /* 0x38 - LAlt */
129
    ' ',
130
    SPECIAL, /* 0x3a - CapsLock */
131
    SPECIAL, /* 0x3b - F1 */
132
    SPECIAL, /* 0x3c - F2 */
133
    SPECIAL, /* 0x3d - F3 */
134
    SPECIAL, /* 0x3e - F4 */
135
    SPECIAL, /* 0x3f - F5 */
136
    SPECIAL, /* 0x40 - F6 */
137
    SPECIAL, /* 0x41 - F7 */
138
    SPECIAL, /* 0x42 - F8 */
139
    SPECIAL, /* 0x43 - F9 */
140
    SPECIAL, /* 0x44 - F10 */
141
    SPECIAL, /* 0x45 - NumLock */
142
    SPECIAL, /* 0x46 - ScrollLock */
143
    '7', '8', '9', '-',
144
    '4', '5', '6', '+',
145
    '1', '2', '3',
146
    '0', '.',
147
    SPECIAL, /* 0x54 - Alt-SysRq */
148
    SPECIAL, /* 0x55 - F11/F12/PF1/FN */
149
    SPECIAL, /* 0x56 - unlabelled key next to LAlt */
150
    SPECIAL, /* 0x57 - F11 */
151
    SPECIAL, /* 0x58 - F12 */
152
    SPECIAL, /* 0x59 */
153
    SPECIAL, /* 0x5a */
154
    SPECIAL, /* 0x5b */
155
    SPECIAL, /* 0x5c */
156
    SPECIAL, /* 0x5d */
157
    SPECIAL, /* 0x5e */
158
    SPECIAL, /* 0x5f */
159
    SPECIAL, /* 0x60 */
160
    SPECIAL, /* 0x61 */
161
    SPECIAL, /* 0x62 */
162
    SPECIAL, /* 0x63 */
163
    SPECIAL, /* 0x64 */
164
    SPECIAL, /* 0x65 */
165
    SPECIAL, /* 0x66 */
166
    SPECIAL, /* 0x67 */
167
    SPECIAL, /* 0x68 */
168
    SPECIAL, /* 0x69 */
169
    SPECIAL, /* 0x6a */
170
    SPECIAL, /* 0x6b */
171
    SPECIAL, /* 0x6c */
172
    SPECIAL, /* 0x6d */
173
    SPECIAL, /* 0x6e */
174
    SPECIAL, /* 0x6f */
175
    SPECIAL, /* 0x70 */
176
    SPECIAL, /* 0x71 */
177
    SPECIAL, /* 0x72 */
178
    SPECIAL, /* 0x73 */
179
    SPECIAL, /* 0x74 */
180
    SPECIAL, /* 0x75 */
181
    SPECIAL, /* 0x76 */
182
    SPECIAL, /* 0x77 */
183
    SPECIAL, /* 0x78 */
184
    SPECIAL, /* 0x79 */
185
    SPECIAL, /* 0x7a */
186
    SPECIAL, /* 0x7b */
187
    SPECIAL, /* 0x7c */
188
    SPECIAL, /* 0x7d */
189
    SPECIAL, /* 0x7e */
190
    SPECIAL, /* 0x7f */
191
};
192
 
193
/** Secondary meaning of scancodes. */
194
static char sc_secondary_map[] = {
195
    SPECIAL, /* 0x00 */
196
    SPECIAL, /* 0x01 - Esc */
197
    '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
198
    SPECIAL, /* 0x0e - Backspace */
199
    '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
200
    SPECIAL, /* 0x1d - LCtrl */
201
    'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
202
    '~',
203
    SPECIAL, /* 0x2a - LShift */
204
    '|',
205
    'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
206
    SPECIAL, /* 0x36 - RShift */
207
    '*',
208
    SPECIAL, /* 0x38 - LAlt */
209
    ' ',
210
    SPECIAL, /* 0x3a - CapsLock */
211
    SPECIAL, /* 0x3b - F1 */
212
    SPECIAL, /* 0x3c - F2 */
213
    SPECIAL, /* 0x3d - F3 */
214
    SPECIAL, /* 0x3e - F4 */
215
    SPECIAL, /* 0x3f - F5 */
216
    SPECIAL, /* 0x40 - F6 */
217
    SPECIAL, /* 0x41 - F7 */
218
    SPECIAL, /* 0x42 - F8 */
219
    SPECIAL, /* 0x43 - F9 */
220
    SPECIAL, /* 0x44 - F10 */
221
    SPECIAL, /* 0x45 - NumLock */
222
    SPECIAL, /* 0x46 - ScrollLock */
223
    '7', '8', '9', '-',
224
    '4', '5', '6', '+',
225
    '1', '2', '3',
226
    '0', '.',
227
    SPECIAL, /* 0x54 - Alt-SysRq */
228
    SPECIAL, /* 0x55 - F11/F12/PF1/FN */
229
    SPECIAL, /* 0x56 - unlabelled key next to LAlt */
230
    SPECIAL, /* 0x57 - F11 */
231
    SPECIAL, /* 0x58 - F12 */
232
    SPECIAL, /* 0x59 */
233
    SPECIAL, /* 0x5a */
234
    SPECIAL, /* 0x5b */
235
    SPECIAL, /* 0x5c */
236
    SPECIAL, /* 0x5d */
237
    SPECIAL, /* 0x5e */
238
    SPECIAL, /* 0x5f */
239
    SPECIAL, /* 0x60 */
240
    SPECIAL, /* 0x61 */
241
    SPECIAL, /* 0x62 */
242
    SPECIAL, /* 0x63 */
243
    SPECIAL, /* 0x64 */
244
    SPECIAL, /* 0x65 */
245
    SPECIAL, /* 0x66 */
246
    SPECIAL, /* 0x67 */
247
    SPECIAL, /* 0x68 */
248
    SPECIAL, /* 0x69 */
249
    SPECIAL, /* 0x6a */
250
    SPECIAL, /* 0x6b */
251
    SPECIAL, /* 0x6c */
252
    SPECIAL, /* 0x6d */
253
    SPECIAL, /* 0x6e */
254
    SPECIAL, /* 0x6f */
255
    SPECIAL, /* 0x70 */
256
    SPECIAL, /* 0x71 */
257
    SPECIAL, /* 0x72 */
258
    SPECIAL, /* 0x73 */
259
    SPECIAL, /* 0x74 */
260
    SPECIAL, /* 0x75 */
261
    SPECIAL, /* 0x76 */
262
    SPECIAL, /* 0x77 */
263
    SPECIAL, /* 0x78 */
264
    SPECIAL, /* 0x79 */
265
    SPECIAL, /* 0x7a */
266
    SPECIAL, /* 0x7b */
267
    SPECIAL, /* 0x7c */
268
    SPECIAL, /* 0x7d */
269
    SPECIAL, /* 0x7e */
270
    SPECIAL, /* 0x7f */
271
};
272
 
958 jermar 273
static void i8042_interrupt(int n, istate_t *istate);
895 jermar 274
static void i8042_wait(void);
576 palkovsky 275
 
1474 palkovsky 276
static iroutine oldvector;
277
/** Initialize keyboard and service interrupts using kernel routine */
278
void i8042_grab(void)
1 jermar 279
{
1474 palkovsky 280
    oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt);
895 jermar 281
    i8042_wait();
894 jermar 282
    i8042_command_write(i8042_SET_COMMAND);
895 jermar 283
    i8042_wait();
894 jermar 284
    i8042_data_write(i8042_COMMAND);
895 jermar 285
    i8042_wait();
1474 palkovsky 286
}
287
/** Resume the former interrupt vector */
288
void i8042_release(void)
289
{
290
    if (oldvector)
291
        exc_register(VECTOR_KBD, "user_interrupt", oldvector);
292
}
670 vana 293
 
1474 palkovsky 294
/** Initialize i8042. */
295
void i8042_init(void)
296
{
297
    int i;
298
 
299
    i8042_grab();
300
        /* Prevent user from accidentaly releasing calling i8042_resume
301
     * and disabling keyboard
302
     */
303
    oldvector = NULL;
304
 
512 jermar 305
    trap_virtual_enable_irqs(1<<IRQ_KBD);
575 palkovsky 306
    chardev_initialize("i8042_kbd", &kbrd, &ops);
511 jermar 307
    stdin = &kbrd;
1195 jermar 308
 
1194 vana 309
    /*
1195 jermar 310
     * Clear input buffer.
311
     * Number of iterations is limited to prevent infinite looping.
312
     */
313
    for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {
1194 vana 314
        i8042_data_read();
1195 jermar 315
    }  
1 jermar 316
}
317
 
508 jermar 318
/** Process i8042 interrupt.
319
 *
320
 * @param n Interrupt vector.
1708 jermar 321
 * @param istate Interrupted state.
508 jermar 322
 */
958 jermar 323
void i8042_interrupt(int n, istate_t *istate)
1 jermar 324
{
1780 jermar 325
    uint8_t x;
326
    uint8_t status;
1 jermar 327
 
1759 palkovsky 328
    while (((status=i8042_status_read()) & i8042_BUFFER_FULL_MASK)) {
1753 palkovsky 329
        x = i8042_data_read();
1759 palkovsky 330
 
331
        if ((status & i8042_MOUSE_DATA))
332
            continue;
333
 
1753 palkovsky 334
        if (x & KEY_RELEASE)
335
            key_released(x ^ KEY_RELEASE);
336
        else
337
            key_pressed(x);
338
    }
1 jermar 339
    trap_virtual_eoi();
340
}
508 jermar 341
 
895 jermar 342
/** Wait until the controller reads its data. */
343
void i8042_wait(void) {
344
    while (i8042_status_read() & i8042_WAIT_MASK) {
345
        /* wait */
346
    }
347
}
348
 
508 jermar 349
/** Process release of key.
350
 *
351
 * @param sc Scancode of the key being released.
352
 */
1780 jermar 353
void key_released(uint8_t sc)
508 jermar 354
{
355
    spinlock_lock(&keylock);
356
    switch (sc) {
357
        case SC_LSHIFT:
358
        case SC_RSHIFT:
359
        keyflags &= ~PRESSED_SHIFT;
360
        break;
361
        case SC_CAPSLOCK:
362
        keyflags &= ~PRESSED_CAPSLOCK;
363
        if (lockflags & LOCKED_CAPSLOCK)
364
            lockflags &= ~LOCKED_CAPSLOCK;
365
        else
366
            lockflags |= LOCKED_CAPSLOCK;
367
        break;
368
        default:
369
        break;
370
    }
371
    spinlock_unlock(&keylock);
372
}
373
 
374
/** Process keypress.
375
 *
376
 * @param sc Scancode of the key being pressed.
377
 */
1780 jermar 378
void key_pressed(uint8_t sc)
508 jermar 379
{
380
    char *map = sc_primary_map;
381
    char ascii = sc_primary_map[sc];
382
    bool shift, capslock;
383
    bool letter = false;
384
 
385
    spinlock_lock(&keylock);
386
    switch (sc) {
601 palkovsky 387
    case SC_LSHIFT:
388
    case SC_RSHIFT:
508 jermar 389
            keyflags |= PRESSED_SHIFT;
390
        break;
601 palkovsky 391
    case SC_CAPSLOCK:
508 jermar 392
        keyflags |= PRESSED_CAPSLOCK;
393
        break;
601 palkovsky 394
    case SC_SPEC_ESCAPE:
395
        break;
396
    case SC_LEFTARR:
397
        chardev_push_character(&kbrd, 0x1b);
398
        chardev_push_character(&kbrd, 0x5b);
399
        chardev_push_character(&kbrd, 0x44);
400
        break;
401
    case SC_RIGHTARR:
402
        chardev_push_character(&kbrd, 0x1b);
403
        chardev_push_character(&kbrd, 0x5b);
404
        chardev_push_character(&kbrd, 0x43);
405
        break;
406
    case SC_UPARR:
407
        chardev_push_character(&kbrd, 0x1b);
408
        chardev_push_character(&kbrd, 0x5b);
409
        chardev_push_character(&kbrd, 0x41);
410
        break;
411
    case SC_DOWNARR:
412
        chardev_push_character(&kbrd, 0x1b);
413
        chardev_push_character(&kbrd, 0x5b);
414
        chardev_push_character(&kbrd, 0x42);
415
        break;
606 palkovsky 416
    case SC_HOME:
417
        chardev_push_character(&kbrd, 0x1b);
418
        chardev_push_character(&kbrd, 0x4f);
419
        chardev_push_character(&kbrd, 0x48);
420
        break;
421
    case SC_END:
422
        chardev_push_character(&kbrd, 0x1b);
423
        chardev_push_character(&kbrd, 0x4f);
424
        chardev_push_character(&kbrd, 0x46);
425
        break;
426
    case SC_DELETE:
427
        chardev_push_character(&kbrd, 0x1b);
428
        chardev_push_character(&kbrd, 0x5b);
429
        chardev_push_character(&kbrd, 0x33);
430
        chardev_push_character(&kbrd, 0x7e);
431
        break;
601 palkovsky 432
    default:
517 jermar 433
            letter = is_lower(ascii);
508 jermar 434
        capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
435
        shift = keyflags & PRESSED_SHIFT;
436
        if (letter && capslock)
437
            shift = !shift;
438
        if (shift)
439
            map = sc_secondary_map;
511 jermar 440
        chardev_push_character(&kbrd, map[sc]);
508 jermar 441
        break;
442
    }
443
    spinlock_unlock(&keylock);
444
}
511 jermar 445
 
446
/* Called from getc(). */
575 palkovsky 447
void i8042_resume(chardev_t *d)
511 jermar 448
{
449
}
450
 
451
/* Called from getc(). */
575 palkovsky 452
void i8042_suspend(chardev_t *d)
511 jermar 453
{
454
}
878 vana 455
 
1780 jermar 456
static uint8_t active_read_buff_read(void)
878 vana 457
{
458
    static int i=0;
894 jermar 459
    i &= (ACTIVE_READ_BUFF_SIZE-1);
460
    if(!active_read_buff[i]) {
878 vana 461
        return 0;
462
    }
463
    return active_read_buff[i++];
464
}
465
 
1780 jermar 466
static void active_read_buff_write(uint8_t ch)
878 vana 467
{
468
    static int i=0;
894 jermar 469
    active_read_buff[i] = ch;
878 vana 470
    i++;
894 jermar 471
    i &= (ACTIVE_READ_BUFF_SIZE-1);
878 vana 472
    active_read_buff[i]=0;
473
}
474
 
475
 
1780 jermar 476
static void active_read_key_pressed(uint8_t sc)
878 vana 477
{
478
    char *map = sc_primary_map;
479
    char ascii = sc_primary_map[sc];
480
    bool shift, capslock;
481
    bool letter = false;
482
 
483
    /*spinlock_lock(&keylock);*/
484
    switch (sc) {
485
    case SC_LSHIFT:
486
    case SC_RSHIFT:
487
            keyflags |= PRESSED_SHIFT;
488
        break;
489
    case SC_CAPSLOCK:
490
        keyflags |= PRESSED_CAPSLOCK;
491
        break;
492
    case SC_SPEC_ESCAPE:
493
        break;
494
    case SC_LEFTARR:
495
        active_read_buff_write(0x1b);
496
        active_read_buff_write(0x5b);
497
        active_read_buff_write(0x44);
498
        break;
499
    case SC_RIGHTARR:
500
        active_read_buff_write(0x1b);
501
        active_read_buff_write(0x5b);
502
        active_read_buff_write(0x43);
503
        break;
504
    case SC_UPARR:
505
        active_read_buff_write(0x1b);
506
        active_read_buff_write(0x5b);
507
        active_read_buff_write(0x41);
508
        break;
509
    case SC_DOWNARR:
510
        active_read_buff_write(0x1b);
511
        active_read_buff_write(0x5b);
512
        active_read_buff_write(0x42);
513
        break;
514
    case SC_HOME:
515
        active_read_buff_write(0x1b);
516
        active_read_buff_write(0x4f);
517
        active_read_buff_write(0x48);
518
        break;
519
    case SC_END:
520
        active_read_buff_write(0x1b);
521
        active_read_buff_write(0x4f);
522
        active_read_buff_write(0x46);
523
        break;
524
    case SC_DELETE:
525
        active_read_buff_write(0x1b);
526
        active_read_buff_write(0x5b);
527
        active_read_buff_write(0x33);
528
        active_read_buff_write(0x7e);
529
        break;
530
    default:
531
            letter = is_lower(ascii);
532
        capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
533
        shift = keyflags & PRESSED_SHIFT;
534
        if (letter && capslock)
535
            shift = !shift;
536
        if (shift)
537
            map = sc_secondary_map;
538
        active_read_buff_write(map[sc]);
539
        break;
540
    }
541
    /*spinlock_unlock(&keylock);*/
542
 
543
}
544
 
545
static char key_read(chardev_t *d)
546
{
547
    char ch;   
548
 
894 jermar 549
    while(!(ch = active_read_buff_read())) {
1780 jermar 550
        uint8_t x;
1753 palkovsky 551
        while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))
894 jermar 552
            ;
553
        x = i8042_data_read();
895 jermar 554
        if (x != IGNORE_CODE) {
555
            if (x & KEY_RELEASE)
556
                key_released(x ^ KEY_RELEASE);
557
            else
558
                active_read_key_pressed(x);
559
        }
878 vana 560
    }
561
    return ch;
562
}
895 jermar 563
 
564
/** Poll for key press and release events.
565
 *
566
 * This function can be used to implement keyboard polling.
567
 */
568
void i8042_poll(void)
569
{
1780 jermar 570
    uint8_t x;
895 jermar 571
 
572
    while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {
573
        x = i8042_data_read();
574
        if (x != IGNORE_CODE) {
575
            if (x & KEY_RELEASE)
576
                key_released(x ^ KEY_RELEASE);
577
            else
578
                key_pressed(x);
579
        }
580
    }
581
}
1702 cejka 582
 
1754 jermar 583
/** @}
1702 cejka 584
 */
585