summaryrefslogtreecommitdiff
path: root/arch/m68k/atari/atakeyb.c
blob: ad919696ec88f949354b67b69590b9c53ae92d38 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
/*
 * Atari Keyboard driver for 680x0 Linux
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/*
 * Atari support by Robert de Vries
 * enhanced by Bjoern Brauel and Roman Hodek
 *
 * 2.6 and input cleanup (removed autorepeat stuff) for 2.6.21
 * 06/07 Michael Schmitz
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/keyboard.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/kd.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/kbd_kern.h>

#include <asm/atariints.h>
#include <asm/atarihw.h>
#include <asm/atarikb.h>
#include <asm/atari_joystick.h>
#include <asm/irq.h>


/* Hook for MIDI serial driver */
void (*atari_MIDI_interrupt_hook) (void);
/* Hook for keyboard inputdev  driver */
void (*atari_input_keyboard_interrupt_hook) (unsigned char, char);
/* Hook for mouse inputdev  driver */
void (*atari_input_mouse_interrupt_hook) (char *);
EXPORT_SYMBOL(atari_input_keyboard_interrupt_hook);
EXPORT_SYMBOL(atari_input_mouse_interrupt_hook);

/* variables for IKBD self test: */

/* state: 0: off; >0: in progress; >1: 0xf1 received */
static volatile int ikbd_self_test;
/* timestamp when last received a char */
static volatile unsigned long self_test_last_rcv;
/* bitmap of keys reported as broken */
static unsigned long broken_keys[128/(sizeof(unsigned long)*8)] = { 0, };

#define BREAK_MASK	(0x80)

/*
 * ++roman: The following changes were applied manually:
 *
 *  - The Alt (= Meta) key works in combination with Shift and
 *    Control, e.g. Alt+Shift+a sends Meta-A (0xc1), Alt+Control+A sends
 *    Meta-Ctrl-A (0x81) ...
 *
 *  - The parentheses on the keypad send '(' and ')' with all
 *    modifiers (as would do e.g. keypad '+'), but they cannot be used as
 *    application keys (i.e. sending Esc O c).
 *
 *  - HELP and UNDO are mapped to be F21 and F24, resp, that send the
 *    codes "\E[M" and "\E[P". (This is better than the old mapping to
 *    F11 and F12, because these codes are on Shift+F1/2 anyway.) This
 *    way, applications that allow their own keyboard mappings
 *    (e.g. tcsh, X Windows) can be configured to use them in the way
 *    the label suggests (providing help or undoing).
 *
 *  - Console switching is done with Alt+Fx (consoles 1..10) and
 *    Shift+Alt+Fx (consoles 11..20).
 *
 *  - The misc. special function implemented in the kernel are mapped
 *    to the following key combinations:
 *
 *      ClrHome          -> Home/Find
 *      Shift + ClrHome  -> End/Select
 *      Shift + Up       -> Page Up
 *      Shift + Down     -> Page Down
 *      Alt + Help       -> show system status
 *      Shift + Help     -> show memory info
 *      Ctrl + Help      -> show registers
 *      Ctrl + Alt + Del -> Reboot
 *      Alt + Undo       -> switch to last console
 *      Shift + Undo     -> send interrupt
 *      Alt + Insert     -> stop/start output (same as ^S/^Q)
 *      Alt + Up         -> Scroll back console (if implemented)
 *      Alt + Down       -> Scroll forward console (if implemented)
 *      Alt + CapsLock   -> NumLock
 *
 * ++Andreas:
 *
 *  - Help mapped to K_HELP
 *  - Undo mapped to K_UNDO (= K_F246)
 *  - Keypad Left/Right Parenthesis mapped to new K_PPAREN[LR]
 */

typedef enum kb_state_t {
	KEYBOARD, AMOUSE, RMOUSE, JOYSTICK, CLOCK, RESYNC
} KB_STATE_T;

#define	IS_SYNC_CODE(sc)	((sc) >= 0x04 && (sc) <= 0xfb)

typedef struct keyboard_state {
	unsigned char buf[6];
	int len;
	KB_STATE_T state;
} KEYBOARD_STATE;

KEYBOARD_STATE kb_state;

/* ++roman: If a keyboard overrun happened, we can't tell in general how much
 * bytes have been lost and in which state of the packet structure we are now.
 * This usually causes keyboards bytes to be interpreted as mouse movements
 * and vice versa, which is very annoying. It seems better to throw away some
 * bytes (that are usually mouse bytes) than to misinterpret them. Therefore I
 * introduced the RESYNC state for IKBD data. In this state, the bytes up to
 * one that really looks like a key event (0x04..0xf2) or the start of a mouse
 * packet (0xf8..0xfb) are thrown away, but at most 2 bytes. This at least
 * speeds up the resynchronization of the event structure, even if maybe a
 * mouse movement is lost. However, nothing is perfect. For bytes 0x01..0x03,
 * it's really hard to decide whether they're mouse or keyboard bytes. Since
 * overruns usually occur when moving the Atari mouse rapidly, they're seen as
 * mouse bytes here. If this is wrong, only a make code of the keyboard gets
 * lost, which isn't too bad. Losing a break code would be disastrous,
 * because then the keyboard repeat strikes...
 */

static irqreturn_t atari_keyboard_interrupt(int irq, void *dummy)
{
	u_char acia_stat;
	int scancode;
	int break_flag;

repeat:
	if (acia.mid_ctrl & ACIA_IRQ)
		if (atari_MIDI_interrupt_hook)
			atari_MIDI_interrupt_hook();
	acia_stat = acia.key_ctrl;
	/* check out if the interrupt came from this ACIA */
	if (!((acia_stat | acia.mid_ctrl) & ACIA_IRQ))
		return IRQ_HANDLED;

	if (acia_stat & ACIA_OVRN) {
		/* a very fast typist or a slow system, give a warning */
		/* ...happens often if interrupts were disabled for too long */
		printk(KERN_DEBUG "Keyboard overrun\n");
		scancode = acia.key_data;
		if (ikbd_self_test)
			/* During self test, don't do resyncing, just process the code */
			goto interpret_scancode;
		else if (IS_SYNC_CODE(scancode)) {
			/* This code seem already to be the start of a new packet or a
			 * single scancode */
			kb_state.state = KEYBOARD;
			goto interpret_scancode;
		} else {
			/* Go to RESYNC state and skip this byte */
			kb_state.state = RESYNC;
			kb_state.len = 1;	/* skip max. 1 another byte */
			goto repeat;
		}
	}

	if (acia_stat & ACIA_RDRF) {
		/* received a character */
		scancode = acia.key_data;	/* get it or reset the ACIA, I'll get it! */
		tasklet_schedule(&keyboard_tasklet);
	interpret_scancode:
		switch (kb_state.state) {
		case KEYBOARD:
			switch (scancode) {
			case 0xF7:
				kb_state.state = AMOUSE;
				kb_state.len = 0;
				break;

			case 0xF8:
			case 0xF9:
			case 0xFA:
			case 0xFB:
				kb_state.state = RMOUSE;
				kb_state.len = 1;
				kb_state.buf[0] = scancode;
				break;

			case 0xFC:
				kb_state.state = CLOCK;
				kb_state.len = 0;
				break;

			case 0xFE:
			case 0xFF:
				kb_state.state = JOYSTICK;
				kb_state.len = 1;
				kb_state.buf[0] = scancode;
				break;

			case 0xF1:
				/* during self-test, note that 0xf1 received */
				if (ikbd_self_test) {
					++ikbd_self_test;
					self_test_last_rcv = jiffies;
					break;
				}
				/* FALL THROUGH */

			default:
				break_flag = scancode & BREAK_MASK;
				scancode &= ~BREAK_MASK;
				if (ikbd_self_test) {
					/* Scancodes sent during the self-test stand for broken
					 * keys (keys being down). The code *should* be a break
					 * code, but nevertheless some AT keyboard interfaces send
					 * make codes instead. Therefore, simply ignore
					 * break_flag...
					 */
					int keyval, keytyp;

					set_bit(scancode, broken_keys);
					self_test_last_rcv = jiffies;
					/* new Linux scancodes; approx. */
					keyval = scancode;
					keytyp = KTYP(keyval) - 0xf0;
					keyval = KVAL(keyval);

					printk(KERN_WARNING "Key with scancode %d ", scancode);
					if (keytyp == KT_LATIN || keytyp == KT_LETTER) {
						if (keyval < ' ')
							printk("('^%c') ", keyval + '@');
						else
							printk("('%c') ", keyval);
					}
					printk("is broken -- will be ignored.\n");
					break;
				} else if (test_bit(scancode, broken_keys))
					break;

				if (atari_input_keyboard_interrupt_hook)
					atari_input_keyboard_interrupt_hook((unsigned char)scancode, !break_flag);
				break;
			}
			break;

		case AMOUSE:
			kb_state.buf[kb_state.len++] = scancode;
			if (kb_state.len == 5) {
				kb_state.state = KEYBOARD;
				/* not yet used */
				/* wake up someone waiting for this */
			}
			break;

		case RMOUSE:
			kb_state.buf[kb_state.len++] = scancode;
			if (kb_state.len == 3) {
				kb_state.state = KEYBOARD;
				if (atari_input_mouse_interrupt_hook)
					atari_input_mouse_interrupt_hook(kb_state.buf);
			}
			break;

		case JOYSTICK:
			kb_state.buf[1] = scancode;
			kb_state.state = KEYBOARD;
#ifdef FIXED_ATARI_JOYSTICK
			atari_joystick_interrupt(kb_state.buf);
#endif
			break;

		case CLOCK:
			kb_state.buf[kb_state.len++] = scancode;
			if (kb_state.len == 6) {
				kb_state.state = KEYBOARD;
				/* wake up someone waiting for this.
				   But will this ever be used, as Linux keeps its own time.
				   Perhaps for synchronization purposes? */
				/* wake_up_interruptible(&clock_wait); */
			}
			break;

		case RESYNC:
			if (kb_state.len <= 0 || IS_SYNC_CODE(scancode)) {
				kb_state.state = KEYBOARD;
				goto interpret_scancode;
			}
			kb_state.len--;
			break;
		}
	}

#if 0
	if (acia_stat & ACIA_CTS)
		/* cannot happen */;
#endif

	if (acia_stat & (ACIA_FE | ACIA_PE)) {
		printk("Error in keyboard communication\n");
	}

	/* handle_scancode() can take a lot of time, so check again if
	 * some character arrived
	 */
	goto repeat;
}

/*
 * I write to the keyboard without using interrupts, I poll instead.
 * This takes for the maximum length string allowed (7) at 7812.5 baud
 * 8 data 1 start 1 stop bit: 9.0 ms
 * If this takes too long for normal operation, interrupt driven writing
 * is the solution. (I made a feeble attempt in that direction but I
 * kept it simple for now.)
 */
void ikbd_write(const char *str, int len)
{
	u_char acia_stat;

	if ((len < 1) || (len > 7))
		panic("ikbd: maximum string length exceeded");
	while (len) {
		acia_stat = acia.key_ctrl;
		if (acia_stat & ACIA_TDRE) {
			acia.key_data = *str++;
			len--;
		}
	}
}

/* Reset (without touching the clock) */
void ikbd_reset(void)
{
	static const char cmd[2] = { 0x80, 0x01 };

	ikbd_write(cmd, 2);

	/*
	 * if all's well code 0xF1 is returned, else the break codes of
	 * all keys making contact
	 */
}

/* Set mouse button action */
void ikbd_mouse_button_action(int mode)
{
	char cmd[2] = { 0x07, mode };

	ikbd_write(cmd, 2);
}

/* Set relative mouse position reporting */
void ikbd_mouse_rel_pos(void)
{
	static const char cmd[1] = { 0x08 };

	ikbd_write(cmd, 1);
}
EXPORT_SYMBOL(ikbd_mouse_rel_pos);

/* Set absolute mouse position reporting */
void ikbd_mouse_abs_pos(int xmax, int ymax)
{
	char cmd[5] = { 0x09, xmax>>8, xmax&0xFF, ymax>>8, ymax&0xFF };

	ikbd_write(cmd, 5);
}

/* Set mouse keycode mode */
void ikbd_mouse_kbd_mode(int dx, int dy)
{
	char cmd[3] = { 0x0A, dx, dy };

	ikbd_write(cmd, 3);
}

/* Set mouse threshold */
void ikbd_mouse_thresh(int x, int y)
{
	char cmd[3] = { 0x0B, x, y };

	ikbd_write(cmd, 3);
}
EXPORT_SYMBOL(ikbd_mouse_thresh);

/* Set mouse scale */
void ikbd_mouse_scale(int x, int y)
{
	char cmd[3] = { 0x0C, x, y };

	ikbd_write(cmd, 3);
}

/* Interrogate mouse position */
void ikbd_mouse_pos_get(int *x, int *y)
{
	static const char cmd[1] = { 0x0D };

	ikbd_write(cmd, 1);

	/* wait for returning bytes */
}

/* Load mouse position */
void ikbd_mouse_pos_set(int x, int y)
{
	char cmd[6] = { 0x0E, 0x00, x>>8, x&0xFF, y>>8, y&0xFF };

	ikbd_write(cmd, 6);
}

/* Set Y=0 at bottom */
void ikbd_mouse_y0_bot(void)
{
	static const char cmd[1] = { 0x0F };

	ikbd_write(cmd, 1);
}

/* Set Y=0 at top */
void ikbd_mouse_y0_top(void)
{
	static const char cmd[1] = { 0x10 };

	ikbd_write(cmd, 1);
}
EXPORT_SYMBOL(ikbd_mouse_y0_top);

/* Disable mouse */
void ikbd_mouse_disable(void)
{
	static const char cmd[1] = { 0x12 };

	ikbd_write(cmd, 1);
}
EXPORT_SYMBOL(ikbd_mouse_disable);

/* Set joystick event reporting */
void ikbd_joystick_event_on(void)
{
	static const char cmd[1] = { 0x14 };

	ikbd_write(cmd, 1);
}

/* Set joystick interrogation mode */
void ikbd_joystick_event_off(void)
{
	static const char cmd[1] = { 0x15 };

	ikbd_write(cmd, 1);
}

/* Joystick interrogation */
void ikbd_joystick_get_state(void)
{
	static const char cmd[1] = { 0x16 };

	ikbd_write(cmd, 1);
}

#if 0
/* This disables all other ikbd activities !!!! */
/* Set joystick monitoring */
void ikbd_joystick_monitor(int rate)
{
	static const char cmd[2] = { 0x17, rate };

	ikbd_write(cmd, 2);

	kb_state.state = JOYSTICK_MONITOR;
}
#endif

/* some joystick routines not in yet (0x18-0x19) */

/* Disable joysticks */
void ikbd_joystick_disable(void)
{
	static const char cmd[1] = { 0x1A };

	ikbd_write(cmd, 1);
}

/*
 * The original code sometimes left the interrupt line of
 * the ACIAs low forever. I hope, it is fixed now.
 *
 * Martin Rogge, 20 Aug 1995
 */

static int atari_keyb_done = 0;

int atari_keyb_init(void)
{
	int error;

	if (atari_keyb_done)
		return 0;

	kb_state.state = KEYBOARD;
	kb_state.len = 0;

	error = request_irq(IRQ_MFP_ACIA, atari_keyboard_interrupt,
			    IRQ_TYPE_SLOW, "keyboard,mouse,MIDI",
			    atari_keyboard_interrupt);
	if (error)
		return error;

	atari_turnoff_irq(IRQ_MFP_ACIA);
	do {
		/* reset IKBD ACIA */
		acia.key_ctrl = ACIA_RESET |
				((atari_switches & ATARI_SWITCH_IKBD) ?
				 ACIA_RHTID : 0);
		(void)acia.key_ctrl;
		(void)acia.key_data;

		/* reset MIDI ACIA */
		acia.mid_ctrl = ACIA_RESET |
				((atari_switches & ATARI_SWITCH_MIDI) ?
				 ACIA_RHTID : 0);
		(void)acia.mid_ctrl;
		(void)acia.mid_data;

		/* divide 500kHz by 64 gives 7812.5 baud */
		/* 8 data no parity 1 start 1 stop bit */
		/* receive interrupt enabled */
		/* RTS low (except if switch selected), transmit interrupt disabled */
		acia.key_ctrl = (ACIA_DIV64|ACIA_D8N1S|ACIA_RIE) |
				((atari_switches & ATARI_SWITCH_IKBD) ?
				 ACIA_RHTID : ACIA_RLTID);

		acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S |
				((atari_switches & ATARI_SWITCH_MIDI) ?
				 ACIA_RHTID : 0);

	/* make sure the interrupt line is up */
	} while ((st_mfp.par_dt_reg & 0x10) == 0);

	/* enable ACIA Interrupts */
	st_mfp.active_edge &= ~0x10;
	atari_turnon_irq(IRQ_MFP_ACIA);

	ikbd_self_test = 1;
	ikbd_reset();
	/* wait for a period of inactivity (here: 0.25s), then assume the IKBD's
	 * self-test is finished */
	self_test_last_rcv = jiffies;
	while (time_before(jiffies, self_test_last_rcv + HZ/4))
		barrier();
	/* if not incremented: no 0xf1 received */
	if (ikbd_self_test == 1)
		printk(KERN_ERR "WARNING: keyboard self test failed!\n");
	ikbd_self_test = 0;

	ikbd_mouse_disable();
	ikbd_joystick_disable();

#ifdef FIXED_ATARI_JOYSTICK
	atari_joystick_init();
#endif

	// flag init done
	atari_keyb_done = 1;
	return 0;
}
EXPORT_SYMBOL_GPL(atari_keyb_init);