summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/lkkbd.c
blob: 77c4d9669ad04ac44889bf72a185cb81c14c2b9b (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
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
/*
 *  Copyright (C) 2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
 */

/*
 * LK keyboard driver for Linux, based on sunkbd.c (C) by Vojtech Pavlik
 */

/*
 * DEC LK201 and LK401 keyboard driver for Linux (primary for DECstations
 * and VAXstations, but can also be used on any standard RS232 with an
 * adaptor).
 *
 * DISCLAIMER: This works for _me_. If you break anything by using the
 * information given below, I will _not_ be liable!
 *
 * RJ10 pinout:		To DE9:		Or DB25:
 *	1 - RxD <---->	Pin 3 (TxD) <->	Pin 2 (TxD)
 *	2 - GND <---->	Pin 5 (GND) <->	Pin 7 (GND)
 *	4 - TxD <---->	Pin 2 (RxD) <->	Pin 3 (RxD)
 *	3 - +12V (from HDD drive connector), DON'T connect to DE9 or DB25!!!
 *
 * Pin numbers for DE9 and DB25 are noted on the plug (quite small:). For
 * RJ10, it's like this:
 *
 *      __=__	Hold the plug in front of you, cable downwards,
 *     /___/|	nose is hidden behind the plug. Now, pin 1 is at
 *    |1234||	the left side, pin 4 at the right and 2 and 3 are
 *    |IIII||	in between, of course:)
 *    |    ||
 *    |____|/
 *      ||	So the adaptor consists of three connected cables
 *      ||	for data transmission (RxD and TxD) and signal ground.
 *		Additionally, you have to get +12V from somewhere.
 * Most easily, you'll get that from a floppy or HDD power connector.
 * It's the yellow cable there (black is ground and red is +5V).
 *
 * The keyboard and all the commands it understands are documented in
 * "VCB02 Video Subsystem - Technical Manual", EK-104AA-TM-001. This
 * document is LK201 specific, but LK401 is mostly compatible. It comes
 * up in LK201 mode and doesn't report any of the additional keys it
 * has. These need to be switched on with the LK_CMD_ENABLE_LK401
 * command. You'll find this document (scanned .pdf file) on MANX,
 * a search engine specific to DEC documentation. Try
 * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * email or by paper mail:
 * Jan-Benedict Glaw, Lilienstraße 16, 33790 Hörste (near Halle/Westf.),
 * Germany.
 */

#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/workqueue.h>

#define DRIVER_DESC	"LK keyboard driver"

MODULE_AUTHOR ("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_LICENSE ("GPL");

/*
 * Known parameters:
 *	bell_volume
 *	keyclick_volume
 *	ctrlclick_volume
 *
 * Please notice that there's not yet an API to set these at runtime.
 */
static int bell_volume = 100; /* % */
module_param (bell_volume, int, 0);
MODULE_PARM_DESC (bell_volume, "Bell volume (in %). default is 100%");

static int keyclick_volume = 100; /* % */
module_param (keyclick_volume, int, 0);
MODULE_PARM_DESC (keyclick_volume, "Keyclick volume (in %), default is 100%");

static int ctrlclick_volume = 100; /* % */
module_param (ctrlclick_volume, int, 0);
MODULE_PARM_DESC (ctrlclick_volume, "Ctrlclick volume (in %), default is 100%");

static int lk201_compose_is_alt;
module_param (lk201_compose_is_alt, int, 0);
MODULE_PARM_DESC (lk201_compose_is_alt, "If set non-zero, LK201' Compose key "
		"will act as an Alt key");



#undef LKKBD_DEBUG
#ifdef LKKBD_DEBUG
#define DBG(x...) printk (x)
#else
#define DBG(x...) do {} while (0)
#endif

/* LED control */
#define LK_LED_WAIT		0x81
#define LK_LED_COMPOSE		0x82
#define LK_LED_SHIFTLOCK	0x84
#define LK_LED_SCROLLLOCK	0x88
#define LK_CMD_LED_ON		0x13
#define LK_CMD_LED_OFF		0x11

/* Mode control */
#define LK_MODE_DOWN		0x80
#define LK_MODE_AUTODOWN	0x82
#define LK_MODE_UPDOWN		0x86
#define LK_CMD_SET_MODE(mode,div)	((mode) | ((div) << 3))

/* Misc commands */
#define LK_CMD_ENABLE_KEYCLICK	0x1b
#define LK_CMD_DISABLE_KEYCLICK	0x99
#define LK_CMD_DISABLE_BELL	0xa1
#define LK_CMD_SOUND_BELL	0xa7
#define LK_CMD_ENABLE_BELL	0x23
#define LK_CMD_DISABLE_CTRCLICK	0xb9
#define LK_CMD_ENABLE_CTRCLICK	0xbb
#define LK_CMD_SET_DEFAULTS	0xd3
#define LK_CMD_POWERCYCLE_RESET	0xfd
#define LK_CMD_ENABLE_LK401	0xe9
#define LK_CMD_REQUEST_ID	0xab

/* Misc responses from keyboard */
#define LK_STUCK_KEY		0x3d
#define LK_SELFTEST_FAILED	0x3e
#define LK_ALL_KEYS_UP		0xb3
#define LK_METRONOME		0xb4
#define LK_OUTPUT_ERROR		0xb5
#define LK_INPUT_ERROR		0xb6
#define LK_KBD_LOCKED		0xb7
#define LK_KBD_TEST_MODE_ACK	0xb8
#define LK_PREFIX_KEY_DOWN	0xb9
#define LK_MODE_CHANGE_ACK	0xba
#define LK_RESPONSE_RESERVED	0xbb

#define LK_NUM_KEYCODES		256
#define LK_NUM_IGNORE_BYTES	6
typedef u_int16_t lk_keycode_t;



static lk_keycode_t lkkbd_keycode[LK_NUM_KEYCODES] = {
	[0x56] = KEY_F1,
	[0x57] = KEY_F2,
	[0x58] = KEY_F3,
	[0x59] = KEY_F4,
	[0x5a] = KEY_F5,
	[0x64] = KEY_F6,
	[0x65] = KEY_F7,
	[0x66] = KEY_F8,
	[0x67] = KEY_F9,
	[0x68] = KEY_F10,
	[0x71] = KEY_F11,
	[0x72] = KEY_F12,
	[0x73] = KEY_F13,
	[0x74] = KEY_F14,
	[0x7c] = KEY_F15,
	[0x7d] = KEY_F16,
	[0x80] = KEY_F17,
	[0x81] = KEY_F18,
	[0x82] = KEY_F19,
	[0x83] = KEY_F20,
	[0x8a] = KEY_FIND,
	[0x8b] = KEY_INSERT,
	[0x8c] = KEY_DELETE,
	[0x8d] = KEY_SELECT,
	[0x8e] = KEY_PAGEUP,
	[0x8f] = KEY_PAGEDOWN,
	[0x92] = KEY_KP0,
	[0x94] = KEY_KPDOT,
	[0x95] = KEY_KPENTER,
	[0x96] = KEY_KP1,
	[0x97] = KEY_KP2,
	[0x98] = KEY_KP3,
	[0x99] = KEY_KP4,
	[0x9a] = KEY_KP5,
	[0x9b] = KEY_KP6,
	[0x9c] = KEY_KPCOMMA,
	[0x9d] = KEY_KP7,
	[0x9e] = KEY_KP8,
	[0x9f] = KEY_KP9,
	[0xa0] = KEY_KPMINUS,
	[0xa1] = KEY_PROG1,
	[0xa2] = KEY_PROG2,
	[0xa3] = KEY_PROG3,
	[0xa4] = KEY_PROG4,
	[0xa7] = KEY_LEFT,
	[0xa8] = KEY_RIGHT,
	[0xa9] = KEY_DOWN,
	[0xaa] = KEY_UP,
	[0xab] = KEY_RIGHTSHIFT,
	[0xac] = KEY_LEFTALT,
	[0xad] = KEY_COMPOSE, /* Right Compose, that is. */
	[0xae] = KEY_LEFTSHIFT, /* Same as KEY_RIGHTSHIFT on LK201 */
	[0xaf] = KEY_LEFTCTRL,
	[0xb0] = KEY_CAPSLOCK,
	[0xb1] = KEY_COMPOSE, /* Left Compose, that is. */
	[0xb2] = KEY_RIGHTALT,
	[0xbc] = KEY_BACKSPACE,
	[0xbd] = KEY_ENTER,
	[0xbe] = KEY_TAB,
	[0xbf] = KEY_ESC,
	[0xc0] = KEY_1,
	[0xc1] = KEY_Q,
	[0xc2] = KEY_A,
	[0xc3] = KEY_Z,
	[0xc5] = KEY_2,
	[0xc6] = KEY_W,
	[0xc7] = KEY_S,
	[0xc8] = KEY_X,
	[0xc9] = KEY_102ND,
	[0xcb] = KEY_3,
	[0xcc] = KEY_E,
	[0xcd] = KEY_D,
	[0xce] = KEY_C,
	[0xd0] = KEY_4,
	[0xd1] = KEY_R,
	[0xd2] = KEY_F,
	[0xd3] = KEY_V,
	[0xd4] = KEY_SPACE,
	[0xd6] = KEY_5,
	[0xd7] = KEY_T,
	[0xd8] = KEY_G,
	[0xd9] = KEY_B,
	[0xdb] = KEY_6,
	[0xdc] = KEY_Y,
	[0xdd] = KEY_H,
	[0xde] = KEY_N,
	[0xe0] = KEY_7,
	[0xe1] = KEY_U,
	[0xe2] = KEY_J,
	[0xe3] = KEY_M,
	[0xe5] = KEY_8,
	[0xe6] = KEY_I,
	[0xe7] = KEY_K,
	[0xe8] = KEY_COMMA,
	[0xea] = KEY_9,
	[0xeb] = KEY_O,
	[0xec] = KEY_L,
	[0xed] = KEY_DOT,
	[0xef] = KEY_0,
	[0xf0] = KEY_P,
	[0xf2] = KEY_SEMICOLON,
	[0xf3] = KEY_SLASH,
	[0xf5] = KEY_EQUAL,
	[0xf6] = KEY_RIGHTBRACE,
	[0xf7] = KEY_BACKSLASH,
	[0xf9] = KEY_MINUS,
	[0xfa] = KEY_LEFTBRACE,
	[0xfb] = KEY_APOSTROPHE,
};

#define CHECK_LED(LK, VAR_ON, VAR_OFF, LED, BITS) do {		\
	if (test_bit (LED, (LK)->dev->led))			\
		VAR_ON |= BITS;					\
	else							\
		VAR_OFF |= BITS;				\
	} while (0)

/*
 * Per-keyboard data
 */
struct lkkbd {
	lk_keycode_t keycode[LK_NUM_KEYCODES];
	int ignore_bytes;
	unsigned char id[LK_NUM_IGNORE_BYTES];
	struct input_dev *dev;
	struct serio *serio;
	struct work_struct tq;
	char name[64];
	char phys[32];
	char type;
	int bell_volume;
	int keyclick_volume;
	int ctrlclick_volume;
};

#ifdef LKKBD_DEBUG
/*
 * Responses from the keyboard and mapping back to their names.
 */
static struct {
	unsigned char value;
	unsigned char *name;
} lk_response[] = {
#define RESPONSE(x) { .value = (x), .name = #x, }
	RESPONSE (LK_STUCK_KEY),
	RESPONSE (LK_SELFTEST_FAILED),
	RESPONSE (LK_ALL_KEYS_UP),
	RESPONSE (LK_METRONOME),
	RESPONSE (LK_OUTPUT_ERROR),
	RESPONSE (LK_INPUT_ERROR),
	RESPONSE (LK_KBD_LOCKED),
	RESPONSE (LK_KBD_TEST_MODE_ACK),
	RESPONSE (LK_PREFIX_KEY_DOWN),
	RESPONSE (LK_MODE_CHANGE_ACK),
	RESPONSE (LK_RESPONSE_RESERVED),
#undef RESPONSE
};

static unsigned char *
response_name (unsigned char value)
{
	int i;

	for (i = 0; i < ARRAY_SIZE (lk_response); i++)
		if (lk_response[i].value == value)
			return lk_response[i].name;

	return "<unknown>";
}
#endif /* LKKBD_DEBUG */

/*
 * Calculate volume parameter byte for a given volume.
 */
static unsigned char
volume_to_hw (int volume_percent)
{
	unsigned char ret = 0;

	if (volume_percent < 0)
		volume_percent = 0;
	if (volume_percent > 100)
		volume_percent = 100;

	if (volume_percent >= 0)
		ret = 7;
	if (volume_percent >= 13)	/* 12.5 */
		ret = 6;
	if (volume_percent >= 25)
		ret = 5;
	if (volume_percent >= 38)	/* 37.5 */
		ret = 4;
	if (volume_percent >= 50)
		ret = 3;
	if (volume_percent >= 63)	/* 62.5 */
		ret = 2;		/* This is the default volume */
	if (volume_percent >= 75)
		ret = 1;
	if (volume_percent >= 88)	/* 87.5 */
		ret = 0;

	ret |= 0x80;

	return ret;
}

static void
lkkbd_detection_done (struct lkkbd *lk)
{
	int i;

	/*
	 * Reset setting for Compose key. Let Compose be KEY_COMPOSE.
	 */
	lk->keycode[0xb1] = KEY_COMPOSE;

	/*
	 * Print keyboard name and modify Compose=Alt on user's request.
	 */
	switch (lk->id[4]) {
		case 1:
			sprintf (lk->name, "DEC LK201 keyboard");

			if (lk201_compose_is_alt)
				lk->keycode[0xb1] = KEY_LEFTALT;
			break;

		case 2:
			sprintf (lk->name, "DEC LK401 keyboard");
			break;

		default:
			sprintf (lk->name, "Unknown DEC keyboard");
			printk (KERN_ERR "lkkbd: keyboard on %s is unknown, "
					"please report to Jan-Benedict Glaw "
					"<jbglaw@lug-owl.de>\n", lk->phys);
			printk (KERN_ERR "lkkbd: keyboard ID'ed as:");
			for (i = 0; i < LK_NUM_IGNORE_BYTES; i++)
				printk (" 0x%02x", lk->id[i]);
			printk ("\n");
			break;
	}
	printk (KERN_INFO "lkkbd: keyboard on %s identified as: %s\n",
			lk->phys, lk->name);

	/*
	 * Report errors during keyboard boot-up.
	 */
	switch (lk->id[2]) {
		case 0x00:
			/* All okay */
			break;

		case LK_STUCK_KEY:
			printk (KERN_ERR "lkkbd: Stuck key on keyboard at "
					"%s\n", lk->phys);
			break;

		case LK_SELFTEST_FAILED:
			printk (KERN_ERR "lkkbd: Selftest failed on keyboard "
					"at %s, keyboard may not work "
					"properly\n", lk->phys);
			break;

		default:
			printk (KERN_ERR "lkkbd: Unknown error %02x on "
					"keyboard at %s\n", lk->id[2],
					lk->phys);
			break;
	}

	/*
	 * Try to hint user if there's a stuck key.
	 */
	if (lk->id[2] == LK_STUCK_KEY && lk->id[3] != 0)
		printk (KERN_ERR "Scancode of stuck key is 0x%02x, keycode "
				"is 0x%04x\n", lk->id[3],
				lk->keycode[lk->id[3]]);

	return;
}

/*
 * lkkbd_interrupt() is called by the low level driver when a character
 * is received.
 */
static irqreturn_t
lkkbd_interrupt (struct serio *serio, unsigned char data, unsigned int flags,
		struct pt_regs *regs)
{
	struct lkkbd *lk = serio_get_drvdata (serio);
	int i;

	DBG (KERN_INFO "Got byte 0x%02x\n", data);

	if (lk->ignore_bytes > 0) {
		DBG (KERN_INFO "Ignoring a byte on %s\n", lk->name);
		lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data;

		if (lk->ignore_bytes == 0)
			lkkbd_detection_done (lk);

		return IRQ_HANDLED;
	}

	switch (data) {
		case LK_ALL_KEYS_UP:
			input_regs (lk->dev, regs);
			for (i = 0; i < ARRAY_SIZE (lkkbd_keycode); i++)
				if (lk->keycode[i] != KEY_RESERVED)
					input_report_key (lk->dev, lk->keycode[i], 0);
			input_sync (lk->dev);
			break;

		case 0x01:
			DBG (KERN_INFO "Got 0x01, scheduling re-initialization\n");
			lk->ignore_bytes = LK_NUM_IGNORE_BYTES;
			lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data;
			schedule_work (&lk->tq);
			break;

		case LK_METRONOME:
		case LK_OUTPUT_ERROR:
		case LK_INPUT_ERROR:
		case LK_KBD_LOCKED:
		case LK_KBD_TEST_MODE_ACK:
		case LK_PREFIX_KEY_DOWN:
		case LK_MODE_CHANGE_ACK:
		case LK_RESPONSE_RESERVED:
			DBG (KERN_INFO "Got %s and don't know how to handle...\n",
					response_name (data));
			break;

		default:
			if (lk->keycode[data] != KEY_RESERVED) {
				input_regs (lk->dev, regs);
				if (!test_bit (lk->keycode[data], lk->dev->key))
					input_report_key (lk->dev, lk->keycode[data], 1);
				else
					input_report_key (lk->dev, lk->keycode[data], 0);
				input_sync (lk->dev);
                        } else
                                printk (KERN_WARNING "%s: Unknown key with "
						"scancode 0x%02x on %s.\n",
						__FILE__, data, lk->name);
	}

	return IRQ_HANDLED;
}

/*
 * lkkbd_event() handles events from the input module.
 */
static int
lkkbd_event (struct input_dev *dev, unsigned int type, unsigned int code,
		int value)
{
	struct lkkbd *lk = dev->private;
	unsigned char leds_on = 0;
	unsigned char leds_off = 0;

	switch (type) {
		case EV_LED:
			CHECK_LED (lk, leds_on, leds_off, LED_CAPSL, LK_LED_SHIFTLOCK);
			CHECK_LED (lk, leds_on, leds_off, LED_COMPOSE, LK_LED_COMPOSE);
			CHECK_LED (lk, leds_on, leds_off, LED_SCROLLL, LK_LED_SCROLLLOCK);
			CHECK_LED (lk, leds_on, leds_off, LED_SLEEP, LK_LED_WAIT);
			if (leds_on != 0) {
				lk->serio->write (lk->serio, LK_CMD_LED_ON);
				lk->serio->write (lk->serio, leds_on);
			}
			if (leds_off != 0) {
				lk->serio->write (lk->serio, LK_CMD_LED_OFF);
				lk->serio->write (lk->serio, leds_off);
			}
			return 0;

		case EV_SND:
			switch (code) {
				case SND_CLICK:
					if (value == 0) {
						DBG ("%s: Deactivating key clicks\n", __FUNCTION__);
						lk->serio->write (lk->serio, LK_CMD_DISABLE_KEYCLICK);
						lk->serio->write (lk->serio, LK_CMD_DISABLE_CTRCLICK);
					} else {
						DBG ("%s: Activating key clicks\n", __FUNCTION__);
						lk->serio->write (lk->serio, LK_CMD_ENABLE_KEYCLICK);
						lk->serio->write (lk->serio, volume_to_hw (lk->keyclick_volume));
						lk->serio->write (lk->serio, LK_CMD_ENABLE_CTRCLICK);
						lk->serio->write (lk->serio, volume_to_hw (lk->ctrlclick_volume));
					}
					return 0;

				case SND_BELL:
					if (value != 0)
						lk->serio->write (lk->serio, LK_CMD_SOUND_BELL);

					return 0;
			}
			break;

		default:
			printk (KERN_ERR "%s (): Got unknown type %d, code %d, value %d\n",
					__FUNCTION__, type, code, value);
	}

	return -1;
}

/*
 * lkkbd_reinit() sets leds and beeps to a state the computer remembers they
 * were in.
 */
static void
lkkbd_reinit (void *data)
{
	struct lkkbd *lk = data;
	int division;
	unsigned char leds_on = 0;
	unsigned char leds_off = 0;

	/* Ask for ID */
	lk->serio->write (lk->serio, LK_CMD_REQUEST_ID);

	/* Reset parameters */
	lk->serio->write (lk->serio, LK_CMD_SET_DEFAULTS);

	/* Set LEDs */
	CHECK_LED (lk, leds_on, leds_off, LED_CAPSL, LK_LED_SHIFTLOCK);
	CHECK_LED (lk, leds_on, leds_off, LED_COMPOSE, LK_LED_COMPOSE);
	CHECK_LED (lk, leds_on, leds_off, LED_SCROLLL, LK_LED_SCROLLLOCK);
	CHECK_LED (lk, leds_on, leds_off, LED_SLEEP, LK_LED_WAIT);
	if (leds_on != 0) {
		lk->serio->write (lk->serio, LK_CMD_LED_ON);
		lk->serio->write (lk->serio, leds_on);
	}
	if (leds_off != 0) {
		lk->serio->write (lk->serio, LK_CMD_LED_OFF);
		lk->serio->write (lk->serio, leds_off);
	}

	/*
	 * Try to activate extended LK401 mode. This command will
	 * only work with a LK401 keyboard and grants access to
	 * LAlt, RAlt, RCompose and RShift.
	 */
	lk->serio->write (lk->serio, LK_CMD_ENABLE_LK401);

	/* Set all keys to UPDOWN mode */
	for (division = 1; division <= 14; division++)
		lk->serio->write (lk->serio, LK_CMD_SET_MODE (LK_MODE_UPDOWN,
					division));

	/* Enable bell and set volume */
	lk->serio->write (lk->serio, LK_CMD_ENABLE_BELL);
	lk->serio->write (lk->serio, volume_to_hw (lk->bell_volume));

	/* Enable/disable keyclick (and possibly set volume) */
	if (test_bit (SND_CLICK, lk->dev->snd)) {
		lk->serio->write (lk->serio, LK_CMD_ENABLE_KEYCLICK);
		lk->serio->write (lk->serio, volume_to_hw (lk->keyclick_volume));
		lk->serio->write (lk->serio, LK_CMD_ENABLE_CTRCLICK);
		lk->serio->write (lk->serio, volume_to_hw (lk->ctrlclick_volume));
	} else {
		lk->serio->write (lk->serio, LK_CMD_DISABLE_KEYCLICK);
		lk->serio->write (lk->serio, LK_CMD_DISABLE_CTRCLICK);
	}

	/* Sound the bell if needed */
	if (test_bit (SND_BELL, lk->dev->snd))
		lk->serio->write (lk->serio, LK_CMD_SOUND_BELL);
}

/*
 * lkkbd_connect() probes for a LK keyboard and fills the necessary structures.
 */
static int
lkkbd_connect (struct serio *serio, struct serio_driver *drv)
{
	struct lkkbd *lk;
	struct input_dev *input_dev;
	int i;
	int err;

	lk = kzalloc (sizeof (struct lkkbd), GFP_KERNEL);
	input_dev = input_allocate_device ();
	if (!lk || !input_dev) {
		err = -ENOMEM;
		goto fail;
	}

	lk->serio = serio;
	lk->dev = input_dev;
	INIT_WORK (&lk->tq, lkkbd_reinit, lk);
	lk->bell_volume = bell_volume;
	lk->keyclick_volume = keyclick_volume;
	lk->ctrlclick_volume = ctrlclick_volume;
	memcpy (lk->keycode, lkkbd_keycode, sizeof (lk_keycode_t) * LK_NUM_KEYCODES);

	strlcpy (lk->name, "DEC LK keyboard", sizeof(lk->name));
	snprintf (lk->phys, sizeof(lk->phys), "%s/input0", serio->phys);

	input_dev->name = lk->name;
	input_dev->phys = lk->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_LKKBD;
	input_dev->id.product = 0;
	input_dev->id.version = 0x0100;
	input_dev->cdev.dev = &serio->dev;
	input_dev->event = lkkbd_event;
	input_dev->private = lk;

	set_bit (EV_KEY, input_dev->evbit);
	set_bit (EV_LED, input_dev->evbit);
	set_bit (EV_SND, input_dev->evbit);
	set_bit (EV_REP, input_dev->evbit);
	set_bit (LED_CAPSL, input_dev->ledbit);
	set_bit (LED_SLEEP, input_dev->ledbit);
	set_bit (LED_COMPOSE, input_dev->ledbit);
	set_bit (LED_SCROLLL, input_dev->ledbit);
	set_bit (SND_BELL, input_dev->sndbit);
	set_bit (SND_CLICK, input_dev->sndbit);

	input_dev->keycode = lk->keycode;
	input_dev->keycodesize = sizeof (lk_keycode_t);
	input_dev->keycodemax = LK_NUM_KEYCODES;
	for (i = 0; i < LK_NUM_KEYCODES; i++)
		set_bit (lk->keycode[i], input_dev->keybit);

	serio_set_drvdata (serio, lk);

	err = serio_open (serio, drv);
	if (err)
		goto fail;

	input_register_device (lk->dev);
	lk->serio->write (lk->serio, LK_CMD_POWERCYCLE_RESET);

	return 0;

 fail:	serio_set_drvdata (serio, NULL);
	input_free_device (input_dev);
	kfree (lk);
	return err;
}

/*
 * lkkbd_disconnect() unregisters and closes behind us.
 */
static void
lkkbd_disconnect (struct serio *serio)
{
	struct lkkbd *lk = serio_get_drvdata (serio);

	input_get_device (lk->dev);
	input_unregister_device (lk->dev);
	serio_close (serio);
	serio_set_drvdata (serio, NULL);
	input_put_device (lk->dev);
	kfree (lk);
}

static struct serio_device_id lkkbd_serio_ids[] = {
	{
		.type	= SERIO_RS232,
		.proto	= SERIO_LKKBD,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{ 0 }
};

MODULE_DEVICE_TABLE(serio, lkkbd_serio_ids);

static struct serio_driver lkkbd_drv = {
	.driver		= {
		.name	= "lkkbd",
	},
	.description	= DRIVER_DESC,
	.id_table	= lkkbd_serio_ids,
	.connect	= lkkbd_connect,
	.disconnect	= lkkbd_disconnect,
	.interrupt	= lkkbd_interrupt,
};

/*
 * The functions for insering/removing us as a module.
 */
static int __init
lkkbd_init (void)
{
	serio_register_driver(&lkkbd_drv);
	return 0;
}

static void __exit
lkkbd_exit (void)
{
	serio_unregister_driver(&lkkbd_drv);
}

module_init (lkkbd_init);
module_exit (lkkbd_exit);