1 /*
2 * Atari Keyboard driver for 680x0 Linux
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file COPYING in the main directory of this archive
6 * for more details.
7 */
8
9 /*
10 * Atari support by Robert de Vries
11 * enhanced by Bjoern Brauel and Roman Hodek
12 *
13 * 2.6 and input cleanup (removed autorepeat stuff) for 2.6.21
14 * 06/07 Michael Schmitz
15 */
16
17 #include <linux/module.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/interrupt.h>
21 #include <linux/errno.h>
22 #include <linux/keyboard.h>
23 #include <linux/delay.h>
24 #include <linux/timer.h>
25 #include <linux/kd.h>
26 #include <linux/random.h>
27 #include <linux/init.h>
28 #include <linux/kbd_kern.h>
29
30 #include <asm/atariints.h>
31 #include <asm/atarihw.h>
32 #include <asm/atarikb.h>
33 #include <asm/atari_joystick.h>
34 #include <asm/irq.h>
35
36
37 /* Hook for MIDI serial driver */
38 void (*atari_MIDI_interrupt_hook) (void);
39 /* Hook for keyboard inputdev driver */
40 void (*atari_input_keyboard_interrupt_hook) (unsigned char, char);
41 /* Hook for mouse inputdev driver */
42 void (*atari_input_mouse_interrupt_hook) (char *);
43 EXPORT_SYMBOL(atari_input_keyboard_interrupt_hook);
44 EXPORT_SYMBOL(atari_input_mouse_interrupt_hook);
45
46 /* variables for IKBD self test: */
47
48 /* state: 0: off; >0: in progress; >1: 0xf1 received */
49 static volatile int ikbd_self_test;
50 /* timestamp when last received a char */
51 static volatile unsigned long self_test_last_rcv;
52 /* bitmap of keys reported as broken */
53 static unsigned long broken_keys[128/(sizeof(unsigned long)*8)] = { 0, };
54
55 #define BREAK_MASK (0x80)
56
57 /*
58 * ++roman: The following changes were applied manually:
59 *
60 * - The Alt (= Meta) key works in combination with Shift and
61 * Control, e.g. Alt+Shift+a sends Meta-A (0xc1), Alt+Control+A sends
62 * Meta-Ctrl-A (0x81) ...
63 *
64 * - The parentheses on the keypad send '(' and ')' with all
65 * modifiers (as would do e.g. keypad '+'), but they cannot be used as
66 * application keys (i.e. sending Esc O c).
67 *
68 * - HELP and UNDO are mapped to be F21 and F24, resp, that send the
69 * codes "\E[M" and "\E[P". (This is better than the old mapping to
70 * F11 and F12, because these codes are on Shift+F1/2 anyway.) This
71 * way, applications that allow their own keyboard mappings
72 * (e.g. tcsh, X Windows) can be configured to use them in the way
73 * the label suggests (providing help or undoing).
74 *
75 * - Console switching is done with Alt+Fx (consoles 1..10) and
76 * Shift+Alt+Fx (consoles 11..20).
77 *
78 * - The misc. special function implemented in the kernel are mapped
79 * to the following key combinations:
80 *
81 * ClrHome -> Home/Find
82 * Shift + ClrHome -> End/Select
83 * Shift + Up -> Page Up
84 * Shift + Down -> Page Down
85 * Alt + Help -> show system status
86 * Shift + Help -> show memory info
87 * Ctrl + Help -> show registers
88 * Ctrl + Alt + Del -> Reboot
89 * Alt + Undo -> switch to last console
90 * Shift + Undo -> send interrupt
91 * Alt + Insert -> stop/start output (same as ^S/^Q)
92 * Alt + Up -> Scroll back console (if implemented)
93 * Alt + Down -> Scroll forward console (if implemented)
94 * Alt + CapsLock -> NumLock
95 *
96 * ++Andreas:
97 *
98 * - Help mapped to K_HELP
99 * - Undo mapped to K_UNDO (= K_F246)
100 * - Keypad Left/Right Parenthesis mapped to new K_PPAREN[LR]
101 */
102
103 typedef enum kb_state_t {
104 KEYBOARD, AMOUSE, RMOUSE, JOYSTICK, CLOCK, RESYNC
105 } KB_STATE_T;
106
107 #define IS_SYNC_CODE(sc) ((sc) >= 0x04 && (sc) <= 0xfb)
108
109 typedef struct keyboard_state {
110 unsigned char buf[6];
111 int len;
112 KB_STATE_T state;
113 } KEYBOARD_STATE;
114
115 KEYBOARD_STATE kb_state;
116
117 /* ++roman: If a keyboard overrun happened, we can't tell in general how much
118 * bytes have been lost and in which state of the packet structure we are now.
119 * This usually causes keyboards bytes to be interpreted as mouse movements
120 * and vice versa, which is very annoying. It seems better to throw away some
121 * bytes (that are usually mouse bytes) than to misinterpret them. Therefore I
122 * introduced the RESYNC state for IKBD data. In this state, the bytes up to
123 * one that really looks like a key event (0x04..0xf2) or the start of a mouse
124 * packet (0xf8..0xfb) are thrown away, but at most 2 bytes. This at least
125 * speeds up the resynchronization of the event structure, even if maybe a
126 * mouse movement is lost. However, nothing is perfect. For bytes 0x01..0x03,
127 * it's really hard to decide whether they're mouse or keyboard bytes. Since
128 * overruns usually occur when moving the Atari mouse rapidly, they're seen as
129 * mouse bytes here. If this is wrong, only a make code of the keyboard gets
130 * lost, which isn't too bad. Losing a break code would be disastrous,
131 * because then the keyboard repeat strikes...
132 */
133
134 static irqreturn_t atari_keyboard_interrupt(int irq, void *dummy)
135 {
136 u_char acia_stat;
137 int scancode;
138 int break_flag;
139
140 repeat:
141 if (acia.mid_ctrl & ACIA_IRQ)
142 if (atari_MIDI_interrupt_hook)
143 atari_MIDI_interrupt_hook();
144 acia_stat = acia.key_ctrl;
145 /* check out if the interrupt came from this ACIA */
146 if (!((acia_stat | acia.mid_ctrl) & ACIA_IRQ))
147 return IRQ_HANDLED;
148
149 if (acia_stat & ACIA_OVRN) {
150 /* a very fast typist or a slow system, give a warning */
151 /* ...happens often if interrupts were disabled for too long */
152 pr_debug("Keyboard overrun\n");
153 scancode = acia.key_data;
154 if (ikbd_self_test)
155 /* During self test, don't do resyncing, just process the code */
156 goto interpret_scancode;
157 else if (IS_SYNC_CODE(scancode)) {
158 /* This code seem already to be the start of a new packet or a
159 * single scancode */
160 kb_state.state = KEYBOARD;
161 goto interpret_scancode;
162 } else {
163 /* Go to RESYNC state and skip this byte */
164 kb_state.state = RESYNC;
165 kb_state.len = 1; /* skip max. 1 another byte */
166 goto repeat;
167 }
168 }
169
170 if (acia_stat & ACIA_RDRF) {
171 /* received a character */
172 scancode = acia.key_data; /* get it or reset the ACIA, I'll get it! */
173 interpret_scancode:
174 switch (kb_state.state) {
175 case KEYBOARD:
176 switch (scancode) {
177 case 0xF7:
178 kb_state.state = AMOUSE;
179 kb_state.len = 0;
180 break;
181
182 case 0xF8:
183 case 0xF9:
184 case 0xFA:
185 case 0xFB:
186 kb_state.state = RMOUSE;
187 kb_state.len = 1;
188 kb_state.buf[0] = scancode;
189 break;
190
191 case 0xFC:
192 kb_state.state = CLOCK;
193 kb_state.len = 0;
194 break;
195
196 case 0xFE:
197 case 0xFF:
198 kb_state.state = JOYSTICK;
199 kb_state.len = 1;
200 kb_state.buf[0] = scancode;
201 break;
202
203 case 0xF1:
204 /* during self-test, note that 0xf1 received */
205 if (ikbd_self_test) {
206 ++ikbd_self_test;
207 self_test_last_rcv = jiffies;
208 break;
209 }
210 fallthrough;
211
212 default:
213 break_flag = scancode & BREAK_MASK;
214 scancode &= ~BREAK_MASK;
215 if (ikbd_self_test) {
216 /* Scancodes sent during the self-test stand for broken
217 * keys (keys being down). The code *should* be a break
218 * code, but nevertheless some AT keyboard interfaces send
219 * make codes instead. Therefore, simply ignore
220 * break_flag...
221 */
222 int keyval, keytyp;
223
224 set_bit(scancode, broken_keys);
225 self_test_last_rcv = jiffies;
226 /* new Linux scancodes; approx. */
227 keyval = scancode;
228 keytyp = KTYP(keyval) - 0xf0;
229 keyval = KVAL(keyval);
230
231 pr_warn("Key with scancode %d ", scancode);
232 if (keytyp == KT_LATIN || keytyp == KT_LETTER) {
233 if (keyval < ' ')
234 pr_cont("('^%c') ", keyval + '@');
235 else
236 pr_cont("('%c') ", keyval);
237 }
238 pr_cont("is broken -- will be ignored.\n");
239 break;
240 } else if (test_bit(scancode, broken_keys))
241 break;
242
243 if (atari_input_keyboard_interrupt_hook)
244 atari_input_keyboard_interrupt_hook((unsigned char)scancode, !break_flag);
245 break;
246 }
247 break;
248
249 case AMOUSE:
250 kb_state.buf[kb_state.len++] = scancode;
251 if (kb_state.len == 5) {
252 kb_state.state = KEYBOARD;
253 /* not yet used */
254 /* wake up someone waiting for this */
255 }
256 break;
257
258 case RMOUSE:
259 kb_state.buf[kb_state.len++] = scancode;
260 if (kb_state.len == 3) {
261 kb_state.state = KEYBOARD;
262 if (atari_input_mouse_interrupt_hook)
263 atari_input_mouse_interrupt_hook(kb_state.buf);
264 }
265 break;
266
267 case JOYSTICK:
268 kb_state.buf[1] = scancode;
269 kb_state.state = KEYBOARD;
270 #ifdef FIXED_ATARI_JOYSTICK
271 atari_joystick_interrupt(kb_state.buf);
272 #endif
273 break;
274
275 case CLOCK:
276 kb_state.buf[kb_state.len++] = scancode;
277 if (kb_state.len == 6) {
278 kb_state.state = KEYBOARD;
279 /* wake up someone waiting for this.
280 But will this ever be used, as Linux keeps its own time.
281 Perhaps for synchronization purposes? */
282 /* wake_up_interruptible(&clock_wait); */
283 }
284 break;
285
286 case RESYNC:
287 if (kb_state.len <= 0 || IS_SYNC_CODE(scancode)) {
288 kb_state.state = KEYBOARD;
289 goto interpret_scancode;
290 }
291 kb_state.len--;
292 break;
293 }
294 }
295
296 #if 0
297 if (acia_stat & ACIA_CTS)
298 /* cannot happen */;
299 #endif
300
301 if (acia_stat & (ACIA_FE | ACIA_PE)) {
302 pr_err("Error in keyboard communication\n");
303 }
304
305 /* handle_scancode() can take a lot of time, so check again if
306 * some character arrived
307 */
308 goto repeat;
309 }
310
311 /*
312 * I write to the keyboard without using interrupts, I poll instead.
313 * This takes for the maximum length string allowed (7) at 7812.5 baud
314 * 8 data 1 start 1 stop bit: 9.0 ms
315 * If this takes too long for normal operation, interrupt driven writing
316 * is the solution. (I made a feeble attempt in that direction but I
317 * kept it simple for now.)
318 */
319 void ikbd_write(const char *str, int len)
320 {
321 u_char acia_stat;
322
323 if ((len < 1) || (len > 7))
324 panic("ikbd: maximum string length exceeded");
325 while (len) {
326 acia_stat = acia.key_ctrl;
327 if (acia_stat & ACIA_TDRE) {
328 acia.key_data = *str++;
329 len--;
330 }
331 }
332 }
333
334 /* Reset (without touching the clock) */
335 static void ikbd_reset(void)
336 {
337 static const char cmd[2] = { 0x80, 0x01 };
338
339 ikbd_write(cmd, 2);
340
341 /*
342 * if all's well code 0xF1 is returned, else the break codes of
343 * all keys making contact
344 */
345 }
346
347 /* Set mouse button action */
348 void ikbd_mouse_button_action(int mode)
349 {
350 char cmd[2] = { 0x07, mode };
351
352 ikbd_write(cmd, 2);
353 }
354
355 /* Set relative mouse position reporting */
356 void ikbd_mouse_rel_pos(void)
357 {
358 static const char cmd[1] = { 0x08 };
359
360 ikbd_write(cmd, 1);
361 }
362 EXPORT_SYMBOL(ikbd_mouse_rel_pos);
363
364 /* Set absolute mouse position reporting */
365 void ikbd_mouse_abs_pos(int xmax, int ymax)
366 {
367 char cmd[5] = { 0x09, xmax>>8, xmax&0xFF, ymax>>8, ymax&0xFF };
368
369 ikbd_write(cmd, 5);
370 }
371
372 /* Set mouse keycode mode */
373 void ikbd_mouse_kbd_mode(int dx, int dy)
374 {
375 char cmd[3] = { 0x0A, dx, dy };
376
377 ikbd_write(cmd, 3);
378 }
379
380 /* Set mouse threshold */
381 void ikbd_mouse_thresh(int x, int y)
382 {
383 char cmd[3] = { 0x0B, x, y };
384
385 ikbd_write(cmd, 3);
386 }
387 EXPORT_SYMBOL(ikbd_mouse_thresh);
388
389 /* Set mouse scale */
390 void ikbd_mouse_scale(int x, int y)
391 {
392 char cmd[3] = { 0x0C, x, y };
393
394 ikbd_write(cmd, 3);
395 }
396
397 /* Interrogate mouse position */
398 void ikbd_mouse_pos_get(int *x, int *y)
399 {
400 static const char cmd[1] = { 0x0D };
401
402 ikbd_write(cmd, 1);
403
404 /* wait for returning bytes */
405 }
406
407 /* Load mouse position */
408 void ikbd_mouse_pos_set(int x, int y)
409 {
410 char cmd[6] = { 0x0E, 0x00, x>>8, x&0xFF, y>>8, y&0xFF };
411
412 ikbd_write(cmd, 6);
413 }
414
415 /* Set Y=0 at bottom */
416 void ikbd_mouse_y0_bot(void)
417 {
418 static const char cmd[1] = { 0x0F };
419
420 ikbd_write(cmd, 1);
421 }
422
423 /* Set Y=0 at top */
424 void ikbd_mouse_y0_top(void)
425 {
426 static const char cmd[1] = { 0x10 };
427
428 ikbd_write(cmd, 1);
429 }
430 EXPORT_SYMBOL(ikbd_mouse_y0_top);
431
432 /* Disable mouse */
433 void ikbd_mouse_disable(void)
434 {
435 static const char cmd[1] = { 0x12 };
436
437 ikbd_write(cmd, 1);
438 }
439 EXPORT_SYMBOL(ikbd_mouse_disable);
440
441 /* Set joystick event reporting */
442 void ikbd_joystick_event_on(void)
443 {
444 static const char cmd[1] = { 0x14 };
445
446 ikbd_write(cmd, 1);
447 }
448
449 /* Set joystick interrogation mode */
450 void ikbd_joystick_event_off(void)
451 {
452 static const char cmd[1] = { 0x15 };
453
454 ikbd_write(cmd, 1);
455 }
456
457 /* Joystick interrogation */
458 void ikbd_joystick_get_state(void)
459 {
460 static const char cmd[1] = { 0x16 };
461
462 ikbd_write(cmd, 1);
463 }
464
465 #if 0
466 /* This disables all other ikbd activities !!!! */
467 /* Set joystick monitoring */
468 void ikbd_joystick_monitor(int rate)
469 {
470 static const char cmd[2] = { 0x17, rate };
471
472 ikbd_write(cmd, 2);
473
474 kb_state.state = JOYSTICK_MONITOR;
475 }
476 #endif
477
478 /* some joystick routines not in yet (0x18-0x19) */
479
480 /* Disable joysticks */
481 void ikbd_joystick_disable(void)
482 {
483 static const char cmd[1] = { 0x1A };
484
485 ikbd_write(cmd, 1);
486 }
487
488 /*
489 * The original code sometimes left the interrupt line of
490 * the ACIAs low forever. I hope, it is fixed now.
491 *
492 * Martin Rogge, 20 Aug 1995
493 */
494
495 static int atari_keyb_done = 0;
496
497 int atari_keyb_init(void)
498 {
499 int error;
500
501 if (atari_keyb_done)
502 return 0;
503
504 kb_state.state = KEYBOARD;
505 kb_state.len = 0;
506
507 error = request_irq(IRQ_MFP_ACIA, atari_keyboard_interrupt, 0,
508 "keyboard,mouse,MIDI", atari_keyboard_interrupt);
509 if (error)
510 return error;
511
512 atari_turnoff_irq(IRQ_MFP_ACIA);
513 do {
514 /* reset IKBD ACIA */
515 acia.key_ctrl = ACIA_RESET |
516 ((atari_switches & ATARI_SWITCH_IKBD) ?
517 ACIA_RHTID : 0);
518 (void)acia.key_ctrl;
519 (void)acia.key_data;
520
521 /* reset MIDI ACIA */
522 acia.mid_ctrl = ACIA_RESET |
523 ((atari_switches & ATARI_SWITCH_MIDI) ?
524 ACIA_RHTID : 0);
525 (void)acia.mid_ctrl;
526 (void)acia.mid_data;
527
528 /* divide 500kHz by 64 gives 7812.5 baud */
529 /* 8 data no parity 1 start 1 stop bit */
530 /* receive interrupt enabled */
531 /* RTS low (except if switch selected), transmit interrupt disabled */
532 acia.key_ctrl = (ACIA_DIV64|ACIA_D8N1S|ACIA_RIE) |
533 ((atari_switches & ATARI_SWITCH_IKBD) ?
534 ACIA_RHTID : ACIA_RLTID);
535
536 acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S |
537 ((atari_switches & ATARI_SWITCH_MIDI) ?
538 ACIA_RHTID : 0);
539
540 /* make sure the interrupt line is up */
541 } while ((st_mfp.par_dt_reg & 0x10) == 0);
542
543 /* enable ACIA Interrupts */
544 st_mfp.active_edge &= ~0x10;
545 atari_turnon_irq(IRQ_MFP_ACIA);
546
547 ikbd_self_test = 1;
548 ikbd_reset();
549 /* wait for a period of inactivity (here: 0.25s), then assume the IKBD's
550 * self-test is finished */
551 self_test_last_rcv = jiffies;
552 while (time_before(jiffies, self_test_last_rcv + HZ/4))
553 barrier();
554 /* if not incremented: no 0xf1 received */
555 if (ikbd_self_test == 1)
556 pr_err("Keyboard self test failed!\n");
557 ikbd_self_test = 0;
558
559 ikbd_mouse_disable();
560 ikbd_joystick_disable();
561
562 #ifdef FIXED_ATARI_JOYSTICK
563 atari_joystick_init();
564 #endif
565
566 // flag init done
567 atari_keyb_done = 1;
568 return 0;
569 }
570 EXPORT_SYMBOL_GPL(atari_keyb_init);
571
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