36b169489eac2d22574d791a986c15974ffeccbc
[platform/kernel/u-boot.git] / board / mpl / common / kbd.c
1 /*
2  * (C) Copyright 2001
3  * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  *
7  * Source partly derived from:
8  * linux/drivers/char/pc_keyb.c
9  */
10 #include <common.h>
11 #include <console.h>
12 #include <asm/processor.h>
13 #include <stdio_dev.h>
14 #include "isa.h"
15 #include "kbd.h"
16
17
18 unsigned char kbd_read_status(void);
19 unsigned char kbd_read_input(void);
20 void kbd_send_data(unsigned char data);
21 void disable_8259A_irq(unsigned int irq);
22 void enable_8259A_irq(unsigned int irq);
23
24 /* used only by send_data - set by keyboard_interrupt */
25
26
27 #undef KBG_DEBUG
28
29 #ifdef KBG_DEBUG
30 #define PRINTF(fmt,args...)     printf (fmt ,##args)
31 #else
32 #define PRINTF(fmt,args...)
33 #endif
34
35 #define KBD_STAT_KOBF           0x01
36 #define KBD_STAT_IBF            0x02
37 #define KBD_STAT_SYS            0x04
38 #define KBD_STAT_CD             0x08
39 #define KBD_STAT_LOCK           0x10
40 #define KBD_STAT_MOBF           0x20
41 #define KBD_STAT_TI_OUT         0x40
42 #define KBD_STAT_PARERR         0x80
43
44 #define KBD_INIT_TIMEOUT        1000    /* Timeout in ms for initializing the keyboard */
45 #define KBC_TIMEOUT             250     /* Timeout in ms for sending to keyboard controller */
46 #define KBD_TIMEOUT             2000    /* Timeout in ms for keyboard command acknowledge */
47 /*
48  *      Keyboard Controller Commands
49  */
50
51 #define KBD_CCMD_READ_MODE      0x20    /* Read mode bits */
52 #define KBD_CCMD_WRITE_MODE     0x60    /* Write mode bits */
53 #define KBD_CCMD_GET_VERSION    0xA1    /* Get controller version */
54 #define KBD_CCMD_MOUSE_DISABLE  0xA7    /* Disable mouse interface */
55 #define KBD_CCMD_MOUSE_ENABLE   0xA8    /* Enable mouse interface */
56 #define KBD_CCMD_TEST_MOUSE     0xA9    /* Mouse interface test */
57 #define KBD_CCMD_SELF_TEST      0xAA    /* Controller self test */
58 #define KBD_CCMD_KBD_TEST       0xAB    /* Keyboard interface test */
59 #define KBD_CCMD_KBD_DISABLE    0xAD    /* Keyboard interface disable */
60 #define KBD_CCMD_KBD_ENABLE     0xAE    /* Keyboard interface enable */
61 #define KBD_CCMD_WRITE_AUX_OBUF 0xD3    /* Write to output buffer as if
62                                            initiated by the auxiliary device */
63 #define KBD_CCMD_WRITE_MOUSE    0xD4    /* Write the following byte to the mouse */
64
65 /*
66  *      Keyboard Commands
67  */
68
69 #define KBD_CMD_SET_LEDS        0xED    /* Set keyboard leds */
70 #define KBD_CMD_SET_RATE        0xF3    /* Set typematic rate */
71 #define KBD_CMD_ENABLE          0xF4    /* Enable scanning */
72 #define KBD_CMD_DISABLE         0xF5    /* Disable scanning */
73 #define KBD_CMD_RESET           0xFF    /* Reset */
74
75 /*
76  *      Keyboard Replies
77  */
78
79 #define KBD_REPLY_POR           0xAA    /* Power on reset */
80 #define KBD_REPLY_ACK           0xFA    /* Command ACK */
81 #define KBD_REPLY_RESEND        0xFE    /* Command NACK, send the cmd again */
82
83 /*
84  *      Status Register Bits
85  */
86
87 #define KBD_STAT_OBF            0x01    /* Keyboard output buffer full */
88 #define KBD_STAT_IBF            0x02    /* Keyboard input buffer full */
89 #define KBD_STAT_SELFTEST       0x04    /* Self test successful */
90 #define KBD_STAT_CMD            0x08    /* Last write was a command write (0=data) */
91 #define KBD_STAT_UNLOCKED       0x10    /* Zero if keyboard locked */
92 #define KBD_STAT_MOUSE_OBF      0x20    /* Mouse output buffer full */
93 #define KBD_STAT_GTO            0x40    /* General receive/xmit timeout */
94 #define KBD_STAT_PERR           0x80    /* Parity error */
95
96 #define AUX_STAT_OBF (KBD_STAT_OBF | KBD_STAT_MOUSE_OBF)
97
98 /*
99  *      Controller Mode Register Bits
100  */
101
102 #define KBD_MODE_KBD_INT        0x01    /* Keyboard data generate IRQ1 */
103 #define KBD_MODE_MOUSE_INT      0x02    /* Mouse data generate IRQ12 */
104 #define KBD_MODE_SYS            0x04    /* The system flag (?) */
105 #define KBD_MODE_NO_KEYLOCK     0x08    /* The keylock doesn't affect the keyboard if set */
106 #define KBD_MODE_DISABLE_KBD    0x10    /* Disable keyboard interface */
107 #define KBD_MODE_DISABLE_MOUSE  0x20    /* Disable mouse interface */
108 #define KBD_MODE_KCC            0x40    /* Scan code conversion to PC format */
109 #define KBD_MODE_RFU            0x80
110
111
112 #define KDB_DATA_PORT           0x60
113 #define KDB_COMMAND_PORT        0x64
114
115 #define LED_SCR                 0x01    /* scroll lock led */
116 #define LED_CAP                 0x04    /* caps lock led */
117 #define LED_NUM                 0x02    /* num lock led */
118
119 #define KBD_BUFFER_LEN          0x20    /* size of the keyboardbuffer */
120
121
122 static volatile char kbd_buffer[KBD_BUFFER_LEN];
123 static volatile int in_pointer = 0;
124 static volatile int out_pointer = 0;
125
126
127 static unsigned char num_lock = 0;
128 static unsigned char caps_lock = 0;
129 static unsigned char scroll_lock = 0;
130 static unsigned char shift = 0;
131 static unsigned char ctrl = 0;
132 static unsigned char alt = 0;
133 static unsigned char e0 = 0;
134 static unsigned char leds = 0;
135
136 #define DEVNAME "kbd"
137
138 /* Simple translation table for the keys */
139
140 static unsigned char kbd_plain_xlate[] = {
141         0xff,0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t',        /* 0x00 - 0x0f */
142          'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\r',0xff, 'a', 's',        /* 0x10 - 0x1f */
143          'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`',0xff,'\\', 'z', 'x', 'c', 'v',        /* 0x20 - 0x2f */
144          'b', 'n', 'm', ',', '.', '/',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
145         0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
146          '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
147         '\r',0xff,0xff
148         };
149
150 static unsigned char kbd_shift_xlate[] = {
151         0xff,0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t',        /* 0x00 - 0x0f */
152          'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\r',0xff, 'A', 'S',        /* 0x10 - 0x1f */
153          'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',0xff, '|', 'Z', 'X', 'C', 'V',        /* 0x20 - 0x2f */
154          'B', 'N', 'M', '<', '>', '?',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
155         0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
156          '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
157         '\r',0xff,0xff
158         };
159
160 static unsigned char kbd_ctrl_xlate[] = {
161         0xff,0x1b, '1',0x00, '3', '4', '5',0x1E, '7', '8', '9', '0',0x1F, '=','\b','\t',        /* 0x00 - 0x0f */
162         0x11,0x17,0x05,0x12,0x14,0x18,0x15,0x09,0x0f,0x10,0x1b,0x1d,'\n',0xff,0x01,0x13,        /* 0x10 - 0x1f */
163         0x04,0x06,0x08,0x09,0x0a,0x0b,0x0c, ';','\'', '~',0x00,0x1c,0x1a,0x18,0x03,0x16,        /* 0x20 - 0x2f */
164         0x02,0x0e,0x0d, '<', '>', '?',0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,0xff,0xff,        /* 0x30 - 0x3f */
165         0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1',        /* 0x40 - 0x4f */
166          '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,  /* 0x50 - 0x5F */
167         '\r',0xff,0xff
168         };
169
170 /******************************************************************
171  * Init
172  ******************************************************************/
173 int isa_kbd_init(void)
174 {
175         char* result;
176         result=kbd_initialize();
177         if(result==NULL) {
178                 PRINTF("AT Keyboard initialized\n");
179                 irq_install_handler(25, (interrupt_handler_t *)handle_isa_int, NULL);
180                 isa_irq_install_handler(KBD_INTERRUPT, (interrupt_handler_t *)kbd_interrupt, NULL);
181                 return (1);
182         } else {
183                 printf("%s\n",result);
184                 return (-1);
185         }
186 }
187
188 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
189 extern int overwrite_console (void);
190 #else
191 int overwrite_console (void)
192 {
193         return (0);
194 }
195 #endif
196
197 int drv_isa_kbd_init (void)
198 {
199         int error;
200         struct stdio_dev kbddev ;
201         char *stdinname  = getenv ("stdin");
202
203         if(isa_kbd_init()==-1)
204                 return -1;
205         memset (&kbddev, 0, sizeof(kbddev));
206         strcpy(kbddev.name, DEVNAME);
207         kbddev.flags =  DEV_FLAGS_INPUT;
208         kbddev.getc = kbd_getc ;
209         kbddev.tstc = kbd_testc ;
210
211         error = stdio_register (&kbddev);
212         if(error==0) {
213                 /* check if this is the standard input device */
214                 if(strcmp(stdinname,DEVNAME)==0) {
215                         /* reassign the console */
216                         if(overwrite_console()) {
217                                 return 1;
218                         }
219                         error=console_assign(stdin,DEVNAME);
220                         if(error==0)
221                                 return 1;
222                         else
223                                 return error;
224                 }
225                 return 1;
226         }
227         return error;
228 }
229
230 /******************************************************************
231  * Queue handling
232  ******************************************************************/
233 /* puts character in the queue and sets up the in and out pointer */
234 void kbd_put_queue(char data)
235 {
236         if((in_pointer+1)==KBD_BUFFER_LEN) {
237                 if(out_pointer==0) {
238                         return; /* buffer full */
239                 } else{
240                         in_pointer=0;
241                 }
242         } else {
243                 if((in_pointer+1)==out_pointer)
244                         return; /* buffer full */
245                 in_pointer++;
246         }
247         kbd_buffer[in_pointer]=data;
248         return;
249 }
250
251 /* test if a character is in the queue */
252 int kbd_testc(struct stdio_dev *dev)
253 {
254         if(in_pointer==out_pointer)
255                 return(0); /* no data */
256         else
257                 return(1);
258 }
259 /* gets the character from the queue */
260 int kbd_getc(struct stdio_dev *dev)
261 {
262         char c;
263         while(in_pointer==out_pointer);
264         if((out_pointer+1)==KBD_BUFFER_LEN)
265                 out_pointer=0;
266         else
267                 out_pointer++;
268         c=kbd_buffer[out_pointer];
269         return (int)c;
270
271 }
272
273
274 /* set LEDs */
275
276 void kbd_set_leds(void)
277 {
278         if(caps_lock==0)
279                 leds&=~LED_CAP; /* switch caps_lock off */
280         else
281                 leds|=LED_CAP; /* switch on LED */
282         if(num_lock==0)
283                 leds&=~LED_NUM; /* switch LED off */
284         else
285                 leds|=LED_NUM;  /* switch on LED */
286         if(scroll_lock==0)
287                 leds&=~LED_SCR; /* switch LED off */
288         else
289                 leds|=LED_SCR; /* switch on LED */
290         kbd_send_data(KBD_CMD_SET_LEDS);
291         kbd_send_data(leds);
292 }
293
294
295 void handle_keyboard_event (unsigned char scancode)
296 {
297         unsigned char keycode;
298
299         /*  Convert scancode to keycode */
300         PRINTF ("scancode %x\n", scancode);
301         if (scancode == 0xe0) {
302                 e0 = 1;         /* special charakters */
303                 return;
304         }
305         if (e0 == 1) {
306                 e0 = 0;         /* delete flag */
307                 if (!(((scancode & 0x7F) == 0x38) ||    /* the right ctrl key */
308                       ((scancode & 0x7F) == 0x1D) ||    /* the right alt key */
309                       ((scancode & 0x7F) == 0x35) ||    /* the right '/' key */
310                       ((scancode & 0x7F) == 0x1C)))
311                         /* the right enter key */
312                         /* we swallow unknown e0 codes */
313                         return;
314         }
315         /* special cntrl keys */
316         switch (scancode) {
317         case 0x2A:
318         case 0x36:              /* shift pressed */
319                 shift = 1;
320                 return;         /* do nothing else */
321         case 0xAA:
322         case 0xB6:              /* shift released */
323                 shift = 0;
324                 return;         /* do nothing else */
325         case 0x38:              /* alt pressed */
326                 alt = 1;
327                 return;         /* do nothing else */
328         case 0xB8:              /* alt released */
329                 alt = 0;
330                 return;         /* do nothing else */
331         case 0x1d:              /* ctrl pressed */
332                 ctrl = 1;
333                 return;         /* do nothing else */
334         case 0x9d:              /* ctrl released */
335                 ctrl = 0;
336                 return;         /* do nothing else */
337         case 0x46:              /* scrollock pressed */
338                 scroll_lock = ~scroll_lock;
339                 kbd_set_leds ();
340                 return;         /* do nothing else */
341         case 0x3A:              /* capslock pressed */
342                 caps_lock = ~caps_lock;
343                 kbd_set_leds ();
344                 return;
345         case 0x45:              /* numlock pressed */
346                 num_lock = ~num_lock;
347                 kbd_set_leds ();
348                 return;
349         case 0xC6:              /* scroll lock released */
350         case 0xC5:              /* num lock released */
351         case 0xBA:              /* caps lock released */
352                 return;         /* just swallow */
353         }
354         if ((scancode & 0x80) == 0x80)  /* key released */
355                 return;
356         /* now, decide which table we need */
357         if (scancode > (sizeof (kbd_plain_xlate) / sizeof (kbd_plain_xlate[0]))) {      /* scancode not in list */
358                 PRINTF ("unkown scancode %X\n", scancode);
359                 return;         /* swallow it */
360         }
361         /* setup plain code first */
362         keycode = kbd_plain_xlate[scancode];
363         if (caps_lock == 1) {   /* caps_lock is pressed, overwrite plain code */
364                 if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
365                         PRINTF ("unkown caps-locked scancode %X\n", scancode);
366                         return; /* swallow it */
367                 }
368                 keycode = kbd_shift_xlate[scancode];
369                 if (keycode < 'A') {    /* we only want the alphas capital */
370                         keycode = kbd_plain_xlate[scancode];
371                 }
372         }
373         if (shift == 1) {       /* shift overwrites caps_lock */
374                 if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) {      /* scancode not in list */
375                         PRINTF ("unkown shifted scancode %X\n", scancode);
376                         return; /* swallow it */
377                 }
378                 keycode = kbd_shift_xlate[scancode];
379         }
380         if (ctrl == 1) {        /* ctrl overwrites caps_lock and shift */
381                 if (scancode > (sizeof (kbd_ctrl_xlate) / sizeof (kbd_ctrl_xlate[0]))) {        /* scancode not in list */
382                         PRINTF ("unkown ctrl scancode %X\n", scancode);
383                         return; /* swallow it */
384                 }
385                 keycode = kbd_ctrl_xlate[scancode];
386         }
387         /* check if valid keycode */
388         if (keycode == 0xff) {
389                 PRINTF ("unkown scancode %X\n", scancode);
390                 return;         /* swallow unknown codes */
391         }
392
393         kbd_put_queue (keycode);
394         PRINTF ("%x\n", keycode);
395 }
396
397 /*
398  * This reads the keyboard status port, and does the
399  * appropriate action.
400  *
401  */
402 unsigned char handle_kbd_event(void)
403 {
404         unsigned char status = kbd_read_status();
405         unsigned int work = 10000;
406
407         while ((--work > 0) && (status & KBD_STAT_OBF)) {
408                 unsigned char scancode;
409
410                 scancode = kbd_read_input();
411
412                 /* Error bytes must be ignored to make the
413                    Synaptics touchpads compaq use work */
414                 /* Ignore error bytes */
415                 if (!(status & (KBD_STAT_GTO | KBD_STAT_PERR)))
416                 {
417                         if (status & KBD_STAT_MOUSE_OBF)
418                                 ; /* not supported: handle_mouse_event(scancode); */
419                         else
420                                 handle_keyboard_event(scancode);
421                 }
422                 status = kbd_read_status();
423         }
424         if (!work)
425                 PRINTF("pc_keyb: controller jammed (0x%02X).\n", status);
426         return status;
427 }
428
429
430 /******************************************************************************
431  * Lowlevel Part of keyboard section
432  */
433 unsigned char kbd_read_status(void)
434 {
435         return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT));
436 }
437
438 unsigned char kbd_read_input(void)
439 {
440         return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT));
441 }
442
443 void kbd_write_command(unsigned char cmd)
444 {
445         out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT,cmd);
446 }
447
448 void kbd_write_output(unsigned char data)
449 {
450         out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT, data);
451 }
452
453 int kbd_read_data(void)
454 {
455         int val;
456         unsigned char status;
457
458         val = -1;
459         status = kbd_read_status();
460         if (status & KBD_STAT_OBF) {
461                 val = kbd_read_input();
462                 if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
463                         val = -2;
464         }
465         return val;
466 }
467
468 int kbd_wait_for_input(void)
469 {
470         unsigned long timeout;
471         int val;
472
473         timeout = KBD_TIMEOUT;
474         val=kbd_read_data();
475         while(val < 0)
476         {
477                 if(timeout--==0)
478                         return -1;
479                 udelay(1000);
480                 val=kbd_read_data();
481         }
482         return val;
483 }
484
485
486 int kb_wait(void)
487 {
488         unsigned long timeout = KBC_TIMEOUT * 10;
489
490         do {
491                 unsigned char status = handle_kbd_event();
492                 if (!(status & KBD_STAT_IBF))
493                         return 0; /* ok */
494                 udelay(1000);
495                 timeout--;
496         } while (timeout);
497         return 1;
498 }
499
500 void kbd_write_command_w(int data)
501 {
502         if(kb_wait())
503                 PRINTF("timeout in kbd_write_command_w\n");
504         kbd_write_command(data);
505 }
506
507 void kbd_write_output_w(int data)
508 {
509         if(kb_wait())
510                 PRINTF("timeout in kbd_write_output_w\n");
511         kbd_write_output(data);
512 }
513
514 void kbd_send_data(unsigned char data)
515 {
516         unsigned char status;
517         disable_8259A_irq(1); /* disable interrupt */
518         kbd_write_output_w(data);
519         status = kbd_wait_for_input();
520         if (status == KBD_REPLY_ACK)
521                 enable_8259A_irq(1); /* enable interrupt */
522 }
523
524
525 char * kbd_initialize(void)
526 {
527         int status;
528
529         in_pointer = 0; /* delete in Buffer */
530         out_pointer = 0;
531         /*
532          * Test the keyboard interface.
533          * This seems to be the only way to get it going.
534          * If the test is successful a x55 is placed in the input buffer.
535          */
536         kbd_write_command_w(KBD_CCMD_SELF_TEST);
537         if (kbd_wait_for_input() != 0x55)
538                 return "Kbd:   failed self test";
539         /*
540          * Perform a keyboard interface test.  This causes the controller
541          * to test the keyboard clock and data lines.  The results of the
542          * test are placed in the input buffer.
543          */
544         kbd_write_command_w(KBD_CCMD_KBD_TEST);
545         if (kbd_wait_for_input() != 0x00)
546                 return "Kbd:   interface failed self test";
547         /*
548          * Enable the keyboard by allowing the keyboard clock to run.
549          */
550         kbd_write_command_w(KBD_CCMD_KBD_ENABLE);
551         status = kbd_wait_for_input();
552         /*
553          * Reset keyboard. If the read times out
554          * then the assumption is that no keyboard is
555          * plugged into the machine.
556          * This defaults the keyboard to scan-code set 2.
557          *
558          * Set up to try again if the keyboard asks for RESEND.
559          */
560         do {
561                 kbd_write_output_w(KBD_CMD_RESET);
562                 status = kbd_wait_for_input();
563                 if (status == KBD_REPLY_ACK)
564                         break;
565                 if (status != KBD_REPLY_RESEND) {
566                         PRINTF("status: %X\n",status);
567                         return "Kbd:   reset failed, no ACK";
568                 }
569         } while (1);
570         if (kbd_wait_for_input() != KBD_REPLY_POR)
571                 return "Kbd:   reset failed, no POR";
572
573         /*
574          * Set keyboard controller mode. During this, the keyboard should be
575          * in the disabled state.
576          *
577          * Set up to try again if the keyboard asks for RESEND.
578          */
579         do {
580                 kbd_write_output_w(KBD_CMD_DISABLE);
581                 status = kbd_wait_for_input();
582                 if (status == KBD_REPLY_ACK)
583                         break;
584                 if (status != KBD_REPLY_RESEND)
585                         return "Kbd:   disable keyboard: no ACK";
586         } while (1);
587
588         kbd_write_command_w(KBD_CCMD_WRITE_MODE);
589         kbd_write_output_w(KBD_MODE_KBD_INT
590                               | KBD_MODE_SYS
591                               | KBD_MODE_DISABLE_MOUSE
592                               | KBD_MODE_KCC);
593
594         /* AMCC powerpc portables need this to use scan-code set 1 -- Cort */
595         kbd_write_command_w(KBD_CCMD_READ_MODE);
596         if (!(kbd_wait_for_input() & KBD_MODE_KCC)) {
597                 /*
598                  * If the controller does not support conversion,
599                  * Set the keyboard to scan-code set 1.
600                  */
601                 kbd_write_output_w(0xF0);
602                 kbd_wait_for_input();
603                 kbd_write_output_w(0x01);
604                 kbd_wait_for_input();
605         }
606         kbd_write_output_w(KBD_CMD_ENABLE);
607         if (kbd_wait_for_input() != KBD_REPLY_ACK)
608                 return "Kbd:   enable keyboard: no ACK";
609
610         /*
611          * Finally, set the typematic rate to maximum.
612          */
613         kbd_write_output_w(KBD_CMD_SET_RATE);
614         if (kbd_wait_for_input() != KBD_REPLY_ACK)
615                 return "Kbd:   Set rate: no ACK";
616         kbd_write_output_w(0x00);
617         if (kbd_wait_for_input() != KBD_REPLY_ACK)
618                 return "Kbd:   Set rate: no ACK";
619         return NULL;
620 }
621
622 void kbd_interrupt(void)
623 {
624         handle_kbd_event();
625 }