summaryrefslogtreecommitdiff
path: root/drivers/input/mouse/alps.c
blob: f6dad83539e0785c57f2b43bfb1c64a0ddc1ec7f (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
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
/*
 * ALPS touchpad PS/2 mouse driver
 *
 * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
 * Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
 * Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
 * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
 * Copyright (c) 2009 Sebastian Kapfer <sebastian_kapfer@gmx.net>
 *
 * ALPS detection, tap switching and status querying info is taken from
 * tpconfig utility (by C. Scott Ananian and Bruce Kall).
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/input.h>
#include <linux/serio.h>
#include <linux/libps2.h>

#include "psmouse.h"
#include "alps.h"

#undef DEBUG
#ifdef DEBUG
#define dbg(format, arg...) printk(KERN_INFO "alps.c: " format "\n", ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif

#define ALPS_OLDPROTO		0x01	/* old style input */
#define ALPS_DUALPOINT		0x02	/* touchpad has trackstick */
#define ALPS_PASS		0x04	/* device has a pass-through port */

#define ALPS_WHEEL		0x08	/* hardware wheel present */
#define ALPS_FW_BK_1		0x10	/* front & back buttons present */
#define ALPS_FW_BK_2		0x20	/* front & back buttons present */
#define ALPS_FOUR_BUTTONS	0x40	/* 4 direction button present */
#define ALPS_PS2_INTERLEAVED	0x80	/* 3-byte PS/2 packet interleaved with
					   6-byte ALPS packet */

static const struct alps_model_info alps_model_data[] = {
	{ { 0x32, 0x02, 0x14 },	0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* Toshiba Salellite Pro M10 */
	{ { 0x33, 0x02, 0x0a },	0x88, 0xf8, ALPS_OLDPROTO },		  /* UMAX-530T */
	{ { 0x53, 0x02, 0x0a },	0xf8, 0xf8, 0 },
	{ { 0x53, 0x02, 0x14 },	0xf8, 0xf8, 0 },
	{ { 0x60, 0x03, 0xc8 }, 0xf8, 0xf8, 0 },			  /* HP ze1115 */
	{ { 0x63, 0x02, 0x0a },	0xf8, 0xf8, 0 },
	{ { 0x63, 0x02, 0x14 },	0xf8, 0xf8, 0 },
	{ { 0x63, 0x02, 0x28 },	0xf8, 0xf8, ALPS_FW_BK_2 },		  /* Fujitsu Siemens S6010 */
	{ { 0x63, 0x02, 0x3c },	0x8f, 0x8f, ALPS_WHEEL },		  /* Toshiba Satellite S2400-103 */
	{ { 0x63, 0x02, 0x50 },	0xef, 0xef, ALPS_FW_BK_1 },		  /* NEC Versa L320 */
	{ { 0x63, 0x02, 0x64 },	0xf8, 0xf8, 0 },
	{ { 0x63, 0x03, 0xc8 }, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* Dell Latitude D800 */
	{ { 0x73, 0x00, 0x0a },	0xf8, 0xf8, ALPS_DUALPOINT },		  /* ThinkPad R61 8918-5QG */
	{ { 0x73, 0x02, 0x0a },	0xf8, 0xf8, 0 },
	{ { 0x73, 0x02, 0x14 },	0xf8, 0xf8, ALPS_FW_BK_2 },		  /* Ahtec Laptop */
	{ { 0x20, 0x02, 0x0e },	0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* XXX */
	{ { 0x22, 0x02, 0x0a },	0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },
	{ { 0x22, 0x02, 0x14 }, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT }, /* Dell Latitude D600 */
	/* Dell Latitude E5500, E6400, E6500, Precision M4400 */
	{ { 0x62, 0x02, 0x14 }, 0xcf, 0xcf,
		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },
	{ { 0x73, 0x02, 0x50 }, 0xcf, 0xcf, ALPS_FOUR_BUTTONS },	  /* Dell Vostro 1400 */
	{ { 0x52, 0x01, 0x14 }, 0xff, 0xff,
		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },	  /* Toshiba Tecra A11-11L */
};

/*
 * XXX - this entry is suspicious. First byte has zero lower nibble,
 * which is what a normal mouse would report. Also, the value 0x0e
 * isn't valid per PS/2 spec.
 */

/*
 * PS/2 packet format
 *
 * byte 0:  0    0 YSGN XSGN    1    M    R    L
 * byte 1: X7   X6   X5   X4   X3   X2   X1   X0
 * byte 2: Y7   Y6   Y5   Y4   Y3   Y2   Y1   Y0
 *
 * Note that the device never signals overflow condition.
 *
 * ALPS absolute Mode - new format
 *
 * byte 0:  1    ?    ?    ?    1    ?    ?    ?
 * byte 1:  0   x6   x5   x4   x3   x2   x1   x0
 * byte 2:  0  x10   x9   x8   x7    ?  fin  ges
 * byte 3:  0   y9   y8   y7    1    M    R    L
 * byte 4:  0   y6   y5   y4   y3   y2   y1   y0
 * byte 5:  0   z6   z5   z4   z3   z2   z1   z0
 *
 * Dualpoint device -- interleaved packet format
 *
 * byte 0:    1    1    0    0    1    1    1    1
 * byte 1:    0   x6   x5   x4   x3   x2   x1   x0
 * byte 2:    0  x10   x9   x8   x7    0  fin  ges
 * byte 3:    0    0 YSGN XSGN    1    1    1    1
 * byte 4:   X7   X6   X5   X4   X3   X2   X1   X0
 * byte 5:   Y7   Y6   Y5   Y4   Y3   Y2   Y1   Y0
 * byte 6:    0   y9   y8   y7    1    m    r    l
 * byte 7:    0   y6   y5   y4   y3   y2   y1   y0
 * byte 8:    0   z6   z5   z4   z3   z2   z1   z0
 *
 * CAPITALS = stick, miniscules = touchpad
 *
 * ?'s can have different meanings on different models,
 * such as wheel rotation, extra buttons, stick buttons
 * on a dualpoint, etc.
 */

static bool alps_is_valid_first_byte(const struct alps_model_info *model,
				     unsigned char data)
{
	return (data & model->mask0) == model->byte0;
}

static void alps_report_buttons(struct psmouse *psmouse,
				struct input_dev *dev1, struct input_dev *dev2,
				int left, int right, int middle)
{
	struct alps_data *priv = psmouse->private;
	const struct alps_model_info *model = priv->i;

	if (model->flags & ALPS_PS2_INTERLEAVED) {
		struct input_dev *dev;

		/*
		 * If shared button has already been reported on the
		 * other device (dev2) then this event should be also
		 * sent through that device.
		 */
		dev = test_bit(BTN_LEFT, dev2->key) ? dev2 : dev1;
		input_report_key(dev, BTN_LEFT, left);

		dev = test_bit(BTN_RIGHT, dev2->key) ? dev2 : dev1;
		input_report_key(dev, BTN_RIGHT, right);

		dev = test_bit(BTN_MIDDLE, dev2->key) ? dev2 : dev1;
		input_report_key(dev, BTN_MIDDLE, middle);

		/*
		 * Sync the _other_ device now, we'll do the first
		 * device later once we report the rest of the events.
		 */
		input_sync(dev2);
	} else {
		/*
		 * For devices with non-interleaved packets we know what
		 * device buttons belong to so we can simply report them.
		 */
		input_report_key(dev1, BTN_LEFT, left);
		input_report_key(dev1, BTN_RIGHT, right);
		input_report_key(dev1, BTN_MIDDLE, middle);
	}
}

static void alps_process_packet(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	const struct alps_model_info *model = priv->i;
	unsigned char *packet = psmouse->packet;
	struct input_dev *dev = psmouse->dev;
	struct input_dev *dev2 = priv->dev2;
	int x, y, z, ges, fin, left, right, middle;
	int back = 0, forward = 0;

	if (model->flags & ALPS_OLDPROTO) {
		left = packet[2] & 0x10;
		right = packet[2] & 0x08;
		middle = 0;
		x = packet[1] | ((packet[0] & 0x07) << 7);
		y = packet[4] | ((packet[3] & 0x07) << 7);
		z = packet[5];
	} else {
		left = packet[3] & 1;
		right = packet[3] & 2;
		middle = packet[3] & 4;
		x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
		y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
		z = packet[5];
	}

	if (model->flags & ALPS_FW_BK_1) {
		back = packet[0] & 0x10;
		forward = packet[2] & 4;
	}

	if (model->flags & ALPS_FW_BK_2) {
		back = packet[3] & 4;
		forward = packet[2] & 4;
		if ((middle = forward && back))
			forward = back = 0;
	}

	ges = packet[2] & 1;
	fin = packet[2] & 2;

	if ((model->flags & ALPS_DUALPOINT) && z == 127) {
		input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
		input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));

		alps_report_buttons(psmouse, dev2, dev, left, right, middle);

		input_sync(dev2);
		return;
	}

	alps_report_buttons(psmouse, dev, dev2, left, right, middle);

	/* Convert hardware tap to a reasonable Z value */
	if (ges && !fin)
		z = 40;

	/*
	 * A "tap and drag" operation is reported by the hardware as a transition
	 * from (!fin && ges) to (fin && ges). This should be translated to the
	 * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
	 */
	if (ges && fin && !priv->prev_fin) {
		input_report_abs(dev, ABS_X, x);
		input_report_abs(dev, ABS_Y, y);
		input_report_abs(dev, ABS_PRESSURE, 0);
		input_report_key(dev, BTN_TOOL_FINGER, 0);
		input_sync(dev);
	}
	priv->prev_fin = fin;

	if (z > 30)
		input_report_key(dev, BTN_TOUCH, 1);
	if (z < 25)
		input_report_key(dev, BTN_TOUCH, 0);

	if (z > 0) {
		input_report_abs(dev, ABS_X, x);
		input_report_abs(dev, ABS_Y, y);
	}

	input_report_abs(dev, ABS_PRESSURE, z);
	input_report_key(dev, BTN_TOOL_FINGER, z > 0);

	if (model->flags & ALPS_WHEEL)
		input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));

	if (model->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
		input_report_key(dev, BTN_FORWARD, forward);
		input_report_key(dev, BTN_BACK, back);
	}

	if (model->flags & ALPS_FOUR_BUTTONS) {
		input_report_key(dev, BTN_0, packet[2] & 4);
		input_report_key(dev, BTN_1, packet[0] & 0x10);
		input_report_key(dev, BTN_2, packet[3] & 4);
		input_report_key(dev, BTN_3, packet[0] & 0x20);
	}

	input_sync(dev);
}

static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
					unsigned char packet[],
					bool report_buttons)
{
	struct alps_data *priv = psmouse->private;
	struct input_dev *dev2 = priv->dev2;

	if (report_buttons)
		alps_report_buttons(psmouse, dev2, psmouse->dev,
				packet[0] & 1, packet[0] & 2, packet[0] & 4);

	input_report_rel(dev2, REL_X,
		packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
	input_report_rel(dev2, REL_Y,
		packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);

	input_sync(dev2);
}

static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;

	if (psmouse->pktcnt < 6)
		return PSMOUSE_GOOD_DATA;

	if (psmouse->pktcnt == 6) {
		/*
		 * Start a timer to flush the packet if it ends up last
		 * 6-byte packet in the stream. Timer needs to fire
		 * psmouse core times out itself. 20 ms should be enough
		 * to decide if we are getting more data or not.
		 */
		mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
		return PSMOUSE_GOOD_DATA;
	}

	del_timer(&priv->timer);

	if (psmouse->packet[6] & 0x80) {

		/*
		 * Highest bit is set - that means we either had
		 * complete ALPS packet and this is start of the
		 * next packet or we got garbage.
		 */

		if (((psmouse->packet[3] |
		      psmouse->packet[4] |
		      psmouse->packet[5]) & 0x80) ||
		    (!alps_is_valid_first_byte(priv->i, psmouse->packet[6]))) {
			dbg("refusing packet %x %x %x %x "
			    "(suspected interleaved ps/2)\n",
			    psmouse->packet[3], psmouse->packet[4],
			    psmouse->packet[5], psmouse->packet[6]);
			return PSMOUSE_BAD_DATA;
		}

		alps_process_packet(psmouse);

		/* Continue with the next packet */
		psmouse->packet[0] = psmouse->packet[6];
		psmouse->pktcnt = 1;

	} else {

		/*
		 * High bit is 0 - that means that we indeed got a PS/2
		 * packet in the middle of ALPS packet.
		 *
		 * There is also possibility that we got 6-byte ALPS
		 * packet followed  by 3-byte packet from trackpoint. We
		 * can not distinguish between these 2 scenarios but
		 * becase the latter is unlikely to happen in course of
		 * normal operation (user would need to press all
		 * buttons on the pad and start moving trackpoint
		 * without touching the pad surface) we assume former.
		 * Even if we are wrong the wost thing that would happen
		 * the cursor would jump but we should not get protocol
		 * desynchronization.
		 */

		alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
					    false);

		/*
		 * Continue with the standard ALPS protocol handling,
		 * but make sure we won't process it as an interleaved
		 * packet again, which may happen if all buttons are
		 * pressed. To avoid this let's reset the 4th bit which
		 * is normally 1.
		 */
		psmouse->packet[3] = psmouse->packet[6] & 0xf7;
		psmouse->pktcnt = 4;
	}

	return PSMOUSE_GOOD_DATA;
}

static void alps_flush_packet(unsigned long data)
{
	struct psmouse *psmouse = (struct psmouse *)data;

	serio_pause_rx(psmouse->ps2dev.serio);

	if (psmouse->pktcnt == 6) {

		/*
		 * We did not any more data in reasonable amount of time.
		 * Validate the last 3 bytes and process as a standard
		 * ALPS packet.
		 */
		if ((psmouse->packet[3] |
		     psmouse->packet[4] |
		     psmouse->packet[5]) & 0x80) {
			dbg("refusing packet %x %x %x "
			    "(suspected interleaved ps/2)\n",
			    psmouse->packet[3], psmouse->packet[4],
			    psmouse->packet[5]);
		} else {
			alps_process_packet(psmouse);
		}
		psmouse->pktcnt = 0;
	}

	serio_continue_rx(psmouse->ps2dev.serio);
}

static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	const struct alps_model_info *model = priv->i;

	if ((psmouse->packet[0] & 0xc8) == 0x08) { /* PS/2 packet */
		if (psmouse->pktcnt == 3) {
			alps_report_bare_ps2_packet(psmouse, psmouse->packet,
						    true);
			return PSMOUSE_FULL_PACKET;
		}
		return PSMOUSE_GOOD_DATA;
	}

	/* Check for PS/2 packet stuffed in the middle of ALPS packet. */

	if ((model->flags & ALPS_PS2_INTERLEAVED) &&
	    psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
		return alps_handle_interleaved_ps2(psmouse);
	}

	if (!alps_is_valid_first_byte(model, psmouse->packet[0])) {
		dbg("refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
		    psmouse->packet[0], model->mask0, model->byte0);
		return PSMOUSE_BAD_DATA;
	}

	/* Bytes 2 - 6 should have 0 in the highest bit */
	if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= 6 &&
	    (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
		dbg("refusing packet[%i] = %x\n",
		    psmouse->pktcnt - 1, psmouse->packet[psmouse->pktcnt - 1]);
		return PSMOUSE_BAD_DATA;
	}

	if (psmouse->pktcnt == 6) {
		alps_process_packet(psmouse);
		return PSMOUSE_FULL_PACKET;
	}

	return PSMOUSE_GOOD_DATA;
}

static const struct alps_model_info *alps_get_model(struct psmouse *psmouse, int *version)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	static const unsigned char rates[] = { 0, 10, 20, 40, 60, 80, 100, 200 };
	unsigned char param[4];
	int i;

	/*
	 * First try "E6 report".
	 * ALPS should return 0,0,10 or 0,0,100
	 */
	param[0] = 0;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11))
		return NULL;

	param[0] = param[1] = param[2] = 0xff;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		return NULL;

	dbg("E6 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);

	if (param[0] != 0 || param[1] != 0 || (param[2] != 10 && param[2] != 100))
		return NULL;

	/*
	 * Now try "E7 report". Allowed responses are in
	 * alps_model_data[].signature
	 */
	param[0] = 0;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE21) ||
	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE21) ||
	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE21))
		return NULL;

	param[0] = param[1] = param[2] = 0xff;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		return NULL;

	dbg("E7 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);

	if (version) {
		for (i = 0; i < ARRAY_SIZE(rates) && param[2] != rates[i]; i++)
			/* empty */;
		*version = (param[0] << 8) | (param[1] << 4) | i;
	}

	for (i = 0; i < ARRAY_SIZE(alps_model_data); i++)
		if (!memcmp(param, alps_model_data[i].signature,
			    sizeof(alps_model_data[i].signature)))
			return alps_model_data + i;

	return NULL;
}

/*
 * For DualPoint devices select the device that should respond to
 * subsequent commands. It looks like glidepad is behind stickpointer,
 * I'd thought it would be other way around...
 */
static int alps_passthrough_mode(struct psmouse *psmouse, bool enable)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;

	if (ps2_command(ps2dev, NULL, cmd) ||
	    ps2_command(ps2dev, NULL, cmd) ||
	    ps2_command(ps2dev, NULL, cmd) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
		return -1;

	/* we may get 3 more bytes, just ignore them */
	ps2_drain(ps2dev, 3, 100);

	return 0;
}

static int alps_absolute_mode(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;

	/* Try ALPS magic knock - 4 disable before enable */
	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
		return -1;

	/*
	 * Switch mouse to poll (remote) mode so motion data will not
	 * get in our way
	 */
	return ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
}

static int alps_get_status(struct psmouse *psmouse, char *param)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;

	/* Get status: 0xF5 0xF5 0xF5 0xE9 */
	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		return -1;

	dbg("Status: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);

	return 0;
}

/*
 * Turn touchpad tapping on or off. The sequences are:
 * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
 * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
 * My guess that 0xE9 (GetInfo) is here as a sync point.
 * For models that also have stickpointer (DualPoints) its tapping
 * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
 * we don't fiddle with it.
 */
static int alps_tap_mode(struct psmouse *psmouse, int enable)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
	unsigned char tap_arg = enable ? 0x0A : 0x00;
	unsigned char param[4];

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, &tap_arg, cmd))
		return -1;

	if (alps_get_status(psmouse, param))
		return -1;

	return 0;
}

/*
 * alps_poll() - poll the touchpad for current motion packet.
 * Used in resync.
 */
static int alps_poll(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	unsigned char buf[6];
	bool poll_failed;

	if (priv->i->flags & ALPS_PASS)
		alps_passthrough_mode(psmouse, true);

	poll_failed = ps2_command(&psmouse->ps2dev, buf,
				  PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;

	if (priv->i->flags & ALPS_PASS)
		alps_passthrough_mode(psmouse, false);

	if (poll_failed || (buf[0] & priv->i->mask0) != priv->i->byte0)
		return -1;

	if ((psmouse->badbyte & 0xc8) == 0x08) {
/*
 * Poll the track stick ...
 */
		if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
			return -1;
	}

	memcpy(psmouse->packet, buf, sizeof(buf));
	return 0;
}

static int alps_hw_init(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	const struct alps_model_info *model = priv->i;

	if ((model->flags & ALPS_PASS) &&
	    alps_passthrough_mode(psmouse, true)) {
		return -1;
	}

	if (alps_tap_mode(psmouse, true)) {
		printk(KERN_WARNING "alps.c: Failed to enable hardware tapping\n");
		return -1;
	}

	if (alps_absolute_mode(psmouse)) {
		printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
		return -1;
	}

	if ((model->flags & ALPS_PASS) &&
	    alps_passthrough_mode(psmouse, false)) {
		return -1;
	}

	/* ALPS needs stream mode, otherwise it won't report any data */
	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
		printk(KERN_ERR "alps.c: Failed to enable stream mode\n");
		return -1;
	}

	return 0;
}

static int alps_reconnect(struct psmouse *psmouse)
{
	const struct alps_model_info *model;

	psmouse_reset(psmouse);

	model = alps_get_model(psmouse, NULL);
	if (!model)
		return -1;

	return alps_hw_init(psmouse);
}

static void alps_disconnect(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;

	psmouse_reset(psmouse);
	del_timer_sync(&priv->timer);
	input_unregister_device(priv->dev2);
	kfree(priv);
}

int alps_init(struct psmouse *psmouse)
{
	struct alps_data *priv;
	const struct alps_model_info *model;
	struct input_dev *dev1 = psmouse->dev, *dev2;
	int version;

	priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
	dev2 = input_allocate_device();
	if (!priv || !dev2)
		goto init_fail;

	priv->dev2 = dev2;
	setup_timer(&priv->timer, alps_flush_packet, (unsigned long)psmouse);

	psmouse->private = priv;

	model = alps_get_model(psmouse, &version);
	if (!model)
		goto init_fail;

	priv->i = model;

	if (alps_hw_init(psmouse))
		goto init_fail;

	/*
	 * Undo part of setup done for us by psmouse core since touchpad
	 * is not a relative device.
	 */
	__clear_bit(EV_REL, dev1->evbit);
	__clear_bit(REL_X, dev1->relbit);
	__clear_bit(REL_Y, dev1->relbit);

	/*
	 * Now set up our capabilities.
	 */
	dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
	dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
	dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
	dev1->keybit[BIT_WORD(BTN_LEFT)] |=
		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);

	dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
	input_set_abs_params(dev1, ABS_X, 0, 1023, 0, 0);
	input_set_abs_params(dev1, ABS_Y, 0, 767, 0, 0);
	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);

	if (model->flags & ALPS_WHEEL) {
		dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
		dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
	}

	if (model->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
		dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
		dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
	}

	if (model->flags & ALPS_FOUR_BUTTONS) {
		dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
		dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
		dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
		dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
	} else {
		dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
	}

	snprintf(priv->phys, sizeof(priv->phys), "%s/input1", psmouse->ps2dev.serio->phys);
	dev2->phys = priv->phys;
	dev2->name = (model->flags & ALPS_DUALPOINT) ? "DualPoint Stick" : "PS/2 Mouse";
	dev2->id.bustype = BUS_I8042;
	dev2->id.vendor  = 0x0002;
	dev2->id.product = PSMOUSE_ALPS;
	dev2->id.version = 0x0000;
	dev2->dev.parent = &psmouse->ps2dev.serio->dev;

	dev2->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	dev2->relbit[BIT_WORD(REL_X)] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
	dev2->keybit[BIT_WORD(BTN_LEFT)] =
		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);

	if (input_register_device(priv->dev2))
		goto init_fail;

	psmouse->protocol_handler = alps_process_byte;
	psmouse->poll = alps_poll;
	psmouse->disconnect = alps_disconnect;
	psmouse->reconnect = alps_reconnect;
	psmouse->pktsize = 6;

	/* We are having trouble resyncing ALPS touchpads so disable it for now */
	psmouse->resync_time = 0;

	return 0;

init_fail:
	psmouse_reset(psmouse);
	input_free_device(dev2);
	kfree(priv);
	psmouse->private = NULL;
	return -1;
}

int alps_detect(struct psmouse *psmouse, bool set_properties)
{
	int version;
	const struct alps_model_info *model;

	model = alps_get_model(psmouse, &version);
	if (!model)
		return -1;

	if (set_properties) {
		psmouse->vendor = "ALPS";
		psmouse->name = model->flags & ALPS_DUALPOINT ?
				"DualPoint TouchPad" : "GlidePoint";
		psmouse->model = version;
	}
	return 0;
}