Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  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
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
/*-
 * Finger Sensing Pad PS/2 mouse driver.
 *
 * Copyright (C) 2005-2007 Asia Vital Components Co., Ltd.
 * Copyright (C) 2005-2011 Tai-hwa Liang, Sentelic Corporation.
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/ctype.h>
#include <linux/libps2.h>
#include <linux/serio.h>
#include <linux/jiffies.h>
#include <linux/slab.h>

#include "psmouse.h"
#include "sentelic.h"

/*
 * Timeout for FSP PS/2 command only (in milliseconds).
 */
#define	FSP_CMD_TIMEOUT		200
#define	FSP_CMD_TIMEOUT2	30

/** Driver version. */
static const char fsp_drv_ver[] = "1.0.0-K";

/*
 * Make sure that the value being sent to FSP will not conflict with
 * possible sample rate values.
 */
static unsigned char fsp_test_swap_cmd(unsigned char reg_val)
{
	switch (reg_val) {
	case 10: case 20: case 40: case 60: case 80: case 100: case 200:
		/*
		 * The requested value being sent to FSP matched to possible
		 * sample rates, swap the given value such that the hardware
		 * wouldn't get confused.
		 */
		return (reg_val >> 4) | (reg_val << 4);
	default:
		return reg_val;	/* swap isn't necessary */
	}
}

/*
 * Make sure that the value being sent to FSP will not conflict with certain
 * commands.
 */
static unsigned char fsp_test_invert_cmd(unsigned char reg_val)
{
	switch (reg_val) {
	case 0xe9: case 0xee: case 0xf2: case 0xff:
		/*
		 * The requested value being sent to FSP matched to certain
		 * commands, inverse the given value such that the hardware
		 * wouldn't get confused.
		 */
		return ~reg_val;
	default:
		return reg_val;	/* inversion isn't necessary */
	}
}

static int fsp_reg_read(struct psmouse *psmouse, int reg_addr, int *reg_val)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[3];
	unsigned char addr;
	int rc = -1;

	/*
	 * We need to shut off the device and switch it into command
	 * mode so we don't confuse our protocol handler. We don't need
	 * to do that for writes because sysfs set helper does this for
	 * us.
	 */
	ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE);
	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

	ps2_begin_command(ps2dev);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	/* should return 0xfe(request for resending) */
	ps2_sendbyte(ps2dev, 0x66, FSP_CMD_TIMEOUT2);
	/* should return 0xfc(failed) */
	ps2_sendbyte(ps2dev, 0x88, FSP_CMD_TIMEOUT2);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	if ((addr = fsp_test_invert_cmd(reg_addr)) != reg_addr) {
		ps2_sendbyte(ps2dev, 0x68, FSP_CMD_TIMEOUT2);
	} else if ((addr = fsp_test_swap_cmd(reg_addr)) != reg_addr) {
		/* swapping is required */
		ps2_sendbyte(ps2dev, 0xcc, FSP_CMD_TIMEOUT2);
		/* expect 0xfe */
	} else {
		/* swapping isn't necessary */
		ps2_sendbyte(ps2dev, 0x66, FSP_CMD_TIMEOUT2);
		/* expect 0xfe */
	}
	/* should return 0xfc(failed) */
	ps2_sendbyte(ps2dev, addr, FSP_CMD_TIMEOUT);

	if (__ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) < 0)
		goto out;

	*reg_val = param[2];
	rc = 0;

 out:
	ps2_end_command(ps2dev);
	ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
	dev_dbg(&ps2dev->serio->dev, "READ REG: 0x%02x is 0x%02x (rc = %d)\n",
		reg_addr, *reg_val, rc);
	return rc;
}

static int fsp_reg_write(struct psmouse *psmouse, int reg_addr, int reg_val)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char v;
	int rc = -1;

	ps2_begin_command(ps2dev);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	if ((v = fsp_test_invert_cmd(reg_addr)) != reg_addr) {
		/* inversion is required */
		ps2_sendbyte(ps2dev, 0x74, FSP_CMD_TIMEOUT2);
	} else {
		if ((v = fsp_test_swap_cmd(reg_addr)) != reg_addr) {
			/* swapping is required */
			ps2_sendbyte(ps2dev, 0x77, FSP_CMD_TIMEOUT2);
		} else {
			/* swapping isn't necessary */
			ps2_sendbyte(ps2dev, 0x55, FSP_CMD_TIMEOUT2);
		}
	}
	/* write the register address in correct order */
	ps2_sendbyte(ps2dev, v, FSP_CMD_TIMEOUT2);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	if ((v = fsp_test_invert_cmd(reg_val)) != reg_val) {
		/* inversion is required */
		ps2_sendbyte(ps2dev, 0x47, FSP_CMD_TIMEOUT2);
	} else if ((v = fsp_test_swap_cmd(reg_val)) != reg_val) {
		/* swapping is required */
		ps2_sendbyte(ps2dev, 0x44, FSP_CMD_TIMEOUT2);
	} else {
		/* swapping isn't necessary */
		ps2_sendbyte(ps2dev, 0x33, FSP_CMD_TIMEOUT2);
	}

	/* write the register value in correct order */
	ps2_sendbyte(ps2dev, v, FSP_CMD_TIMEOUT2);
	rc = 0;

 out:
	ps2_end_command(ps2dev);
	dev_dbg(&ps2dev->serio->dev, "WRITE REG: 0x%02x to 0x%02x (rc = %d)\n",
		reg_addr, reg_val, rc);
	return rc;
}

/* Enable register clock gating for writing certain registers */
static int fsp_reg_write_enable(struct psmouse *psmouse, bool enable)
{
	int v, nv;

	if (fsp_reg_read(psmouse, FSP_REG_SYSCTL1, &v) == -1)
		return -1;

	if (enable)
		nv = v | FSP_BIT_EN_REG_CLK;
	else
		nv = v & ~FSP_BIT_EN_REG_CLK;

	/* only write if necessary */
	if (nv != v)
		if (fsp_reg_write(psmouse, FSP_REG_SYSCTL1, nv) == -1)
			return -1;

	return 0;
}

static int fsp_page_reg_read(struct psmouse *psmouse, int *reg_val)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[3];
	int rc = -1;

	ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE);
	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

	ps2_begin_command(ps2dev);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	ps2_sendbyte(ps2dev, 0x66, FSP_CMD_TIMEOUT2);
	ps2_sendbyte(ps2dev, 0x88, FSP_CMD_TIMEOUT2);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	ps2_sendbyte(ps2dev, 0x83, FSP_CMD_TIMEOUT2);
	ps2_sendbyte(ps2dev, 0x88, FSP_CMD_TIMEOUT2);

	/* get the returned result */
	if (__ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		goto out;

	*reg_val = param[2];
	rc = 0;

 out:
	ps2_end_command(ps2dev);
	ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
	dev_dbg(&ps2dev->serio->dev, "READ PAGE REG: 0x%02x (rc = %d)\n",
		*reg_val, rc);
	return rc;
}

static int fsp_page_reg_write(struct psmouse *psmouse, int reg_val)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char v;
	int rc = -1;

	ps2_begin_command(ps2dev);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	ps2_sendbyte(ps2dev, 0x38, FSP_CMD_TIMEOUT2);
	ps2_sendbyte(ps2dev, 0x88, FSP_CMD_TIMEOUT2);

	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
		goto out;

	if ((v = fsp_test_invert_cmd(reg_val)) != reg_val) {
		ps2_sendbyte(ps2dev, 0x47, FSP_CMD_TIMEOUT2);
	} else if ((v = fsp_test_swap_cmd(reg_val)) != reg_val) {
		/* swapping is required */
		ps2_sendbyte(ps2dev, 0x44, FSP_CMD_TIMEOUT2);
	} else {
		/* swapping isn't necessary */
		ps2_sendbyte(ps2dev, 0x33, FSP_CMD_TIMEOUT2);
	}

	ps2_sendbyte(ps2dev, v, FSP_CMD_TIMEOUT2);
	rc = 0;

 out:
	ps2_end_command(ps2dev);
	dev_dbg(&ps2dev->serio->dev, "WRITE PAGE REG: to 0x%02x (rc = %d)\n",
		reg_val, rc);
	return rc;
}

static int fsp_get_version(struct psmouse *psmouse, int *version)
{
	if (fsp_reg_read(psmouse, FSP_REG_VERSION, version))
		return -EIO;

	return 0;
}

static int fsp_get_revision(struct psmouse *psmouse, int *rev)
{
	if (fsp_reg_read(psmouse, FSP_REG_REVISION, rev))
		return -EIO;

	return 0;
}

static int fsp_get_buttons(struct psmouse *psmouse, int *btn)
{
	static const int buttons[] = {
		0x16, /* Left/Middle/Right/Forward/Backward & Scroll Up/Down */
		0x06, /* Left/Middle/Right & Scroll Up/Down/Right/Left */
		0x04, /* Left/Middle/Right & Scroll Up/Down */
		0x02, /* Left/Middle/Right */
	};
	int val;

	if (fsp_reg_read(psmouse, FSP_REG_TMOD_STATUS, &val) == -1)
		return -EIO;

	*btn = buttons[(val & 0x30) >> 4];
	return 0;
}

/* Enable on-pad command tag output */
static int fsp_opc_tag_enable(struct psmouse *psmouse, bool enable)
{
	int v, nv;
	int res = 0;

	if (fsp_reg_read(psmouse, FSP_REG_OPC_QDOWN, &v) == -1) {
		dev_err(&psmouse->ps2dev.serio->dev, "Unable get OPC state.\n");
		return -EIO;
	}

	if (enable)
		nv = v | FSP_BIT_EN_OPC_TAG;
	else
		nv = v & ~FSP_BIT_EN_OPC_TAG;

	/* only write if necessary */
	if (nv != v) {
		fsp_reg_write_enable(psmouse, true);
		res = fsp_reg_write(psmouse, FSP_REG_OPC_QDOWN, nv);
		fsp_reg_write_enable(psmouse, false);
	}

	if (res != 0) {
		dev_err(&psmouse->ps2dev.serio->dev,
			"Unable to enable OPC tag.\n");
		res = -EIO;
	}

	return res;
}

static int fsp_onpad_vscr(struct psmouse *psmouse, bool enable)
{
	struct fsp_data *pad = psmouse->private;
	int val;

	if (fsp_reg_read(psmouse, FSP_REG_ONPAD_CTL, &val))
		return -EIO;

	pad->vscroll = enable;

	if (enable)
		val |= (FSP_BIT_FIX_VSCR | FSP_BIT_ONPAD_ENABLE);
	else
		val &= ~FSP_BIT_FIX_VSCR;

	if (fsp_reg_write(psmouse, FSP_REG_ONPAD_CTL, val))
		return -EIO;

	return 0;
}

static int fsp_onpad_hscr(struct psmouse *psmouse, bool enable)
{
	struct fsp_data *pad = psmouse->private;
	int val, v2;

	if (fsp_reg_read(psmouse, FSP_REG_ONPAD_CTL, &val))
		return -EIO;

	if (fsp_reg_read(psmouse, FSP_REG_SYSCTL5, &v2))
		return -EIO;

	pad->hscroll = enable;

	if (enable) {
		val |= (FSP_BIT_FIX_HSCR | FSP_BIT_ONPAD_ENABLE);
		v2 |= FSP_BIT_EN_MSID6;
	} else {
		val &= ~FSP_BIT_FIX_HSCR;
		v2 &= ~(FSP_BIT_EN_MSID6 | FSP_BIT_EN_MSID7 | FSP_BIT_EN_MSID8);
	}

	if (fsp_reg_write(psmouse, FSP_REG_ONPAD_CTL, val))
		return -EIO;

	/* reconfigure horizontal scrolling packet output */
	if (fsp_reg_write(psmouse, FSP_REG_SYSCTL5, v2))
		return -EIO;

	return 0;
}

/*
 * Write device specific initial parameters.
 *
 * ex: 0xab 0xcd - write oxcd into register 0xab
 */
static ssize_t fsp_attr_set_setreg(struct psmouse *psmouse, void *data,
				   const char *buf, size_t count)
{
	unsigned long reg, val;
	char *rest;
	ssize_t retval;

	reg = simple_strtoul(buf, &rest, 16);
	if (rest == buf || *rest != ' ' || reg > 0xff)
		return -EINVAL;

	if (strict_strtoul(rest + 1, 16, &val) || val > 0xff)
		return -EINVAL;

	if (fsp_reg_write_enable(psmouse, true))
		return -EIO;

	retval = fsp_reg_write(psmouse, reg, val) < 0 ? -EIO : count;

	fsp_reg_write_enable(psmouse, false);

	return count;
}

PSMOUSE_DEFINE_WO_ATTR(setreg, S_IWUSR, NULL, fsp_attr_set_setreg);

static ssize_t fsp_attr_show_getreg(struct psmouse *psmouse,
					void *data, char *buf)
{
	struct fsp_data *pad = psmouse->private;

	return sprintf(buf, "%02x%02x\n", pad->last_reg, pad->last_val);
}

/*
 * Read a register from device.
 *
 * ex: 0xab -- read content from register 0xab
 */
static ssize_t fsp_attr_set_getreg(struct psmouse *psmouse, void *data,
					const char *buf, size_t count)
{
	struct fsp_data *pad = psmouse->private;
	unsigned long reg;
	int val;

	if (strict_strtoul(buf, 16, &reg) || reg > 0xff)
		return -EINVAL;

	if (fsp_reg_read(psmouse, reg, &val))
		return -EIO;

	pad->last_reg = reg;
	pad->last_val = val;

	return count;
}

PSMOUSE_DEFINE_ATTR(getreg, S_IWUSR | S_IRUGO, NULL,
			fsp_attr_show_getreg, fsp_attr_set_getreg);

static ssize_t fsp_attr_show_pagereg(struct psmouse *psmouse,
					void *data, char *buf)
{
	int val = 0;

	if (fsp_page_reg_read(psmouse, &val))
		return -EIO;

	return sprintf(buf, "%02x\n", val);
}

static ssize_t fsp_attr_set_pagereg(struct psmouse *psmouse, void *data,
					const char *buf, size_t count)
{
	unsigned long val;

	if (strict_strtoul(buf, 16, &val) || val > 0xff)
		return -EINVAL;

	if (fsp_page_reg_write(psmouse, val))
		return -EIO;

	return count;
}

PSMOUSE_DEFINE_ATTR(page, S_IWUSR | S_IRUGO, NULL,
			fsp_attr_show_pagereg, fsp_attr_set_pagereg);

static ssize_t fsp_attr_show_vscroll(struct psmouse *psmouse,
					void *data, char *buf)
{
	struct fsp_data *pad = psmouse->private;

	return sprintf(buf, "%d\n", pad->vscroll);
}

static ssize_t fsp_attr_set_vscroll(struct psmouse *psmouse, void *data,
					const char *buf, size_t count)
{
	unsigned long val;

	if (strict_strtoul(buf, 10, &val) || val > 1)
		return -EINVAL;

	fsp_onpad_vscr(psmouse, val);

	return count;
}

PSMOUSE_DEFINE_ATTR(vscroll, S_IWUSR | S_IRUGO, NULL,
			fsp_attr_show_vscroll, fsp_attr_set_vscroll);

static ssize_t fsp_attr_show_hscroll(struct psmouse *psmouse,
					void *data, char *buf)
{
	struct fsp_data *pad = psmouse->private;

	return sprintf(buf, "%d\n", pad->hscroll);
}

static ssize_t fsp_attr_set_hscroll(struct psmouse *psmouse, void *data,
					const char *buf, size_t count)
{
	unsigned long val;

	if (strict_strtoul(buf, 10, &val) || val > 1)
		return -EINVAL;

	fsp_onpad_hscr(psmouse, val);

	return count;
}

PSMOUSE_DEFINE_ATTR(hscroll, S_IWUSR | S_IRUGO, NULL,
			fsp_attr_show_hscroll, fsp_attr_set_hscroll);

static ssize_t fsp_attr_show_flags(struct psmouse *psmouse,
					void *data, char *buf)
{
	struct fsp_data *pad = psmouse->private;

	return sprintf(buf, "%c\n",
			pad->flags & FSPDRV_FLAG_EN_OPC ? 'C' : 'c');
}

static ssize_t fsp_attr_set_flags(struct psmouse *psmouse, void *data,
					const char *buf, size_t count)
{
	struct fsp_data *pad = psmouse->private;
	size_t i;

	for (i = 0; i < count; i++) {
		switch (buf[i]) {
		case 'C':
			pad->flags |= FSPDRV_FLAG_EN_OPC;
			break;
		case 'c':
			pad->flags &= ~FSPDRV_FLAG_EN_OPC;
			break;
		default:
			return -EINVAL;
		}
	}
	return count;
}

PSMOUSE_DEFINE_ATTR(flags, S_IWUSR | S_IRUGO, NULL,
			fsp_attr_show_flags, fsp_attr_set_flags);

static ssize_t fsp_attr_show_ver(struct psmouse *psmouse,
					void *data, char *buf)
{
	return sprintf(buf, "Sentelic FSP kernel module %s\n", fsp_drv_ver);
}

PSMOUSE_DEFINE_RO_ATTR(ver, S_IRUGO, NULL, fsp_attr_show_ver);

static struct attribute *fsp_attributes[] = {
	&psmouse_attr_setreg.dattr.attr,
	&psmouse_attr_getreg.dattr.attr,
	&psmouse_attr_page.dattr.attr,
	&psmouse_attr_vscroll.dattr.attr,
	&psmouse_attr_hscroll.dattr.attr,
	&psmouse_attr_flags.dattr.attr,
	&psmouse_attr_ver.dattr.attr,
	NULL
};

static struct attribute_group fsp_attribute_group = {
	.attrs = fsp_attributes,
};

#ifdef FSP_DEBUG
static void fsp_packet_debug(unsigned char packet[])
{
	static unsigned int ps2_packet_cnt;
	static unsigned int ps2_last_second;
	unsigned int jiffies_msec;

	ps2_packet_cnt++;
	jiffies_msec = jiffies_to_msecs(jiffies);
	psmouse_dbg(psmouse,
		    "%08dms PS/2 packets: %02x, %02x, %02x, %02x\n",
		    jiffies_msec, packet[0], packet[1], packet[2], packet[3]);

	if (jiffies_msec - ps2_last_second > 1000) {
		psmouse_dbg(psmouse, "PS/2 packets/sec = %d\n", ps2_packet_cnt);
		ps2_packet_cnt = 0;
		ps2_last_second = jiffies_msec;
	}
}
#else
static void fsp_packet_debug(unsigned char packet[])
{
}
#endif

static psmouse_ret_t fsp_process_byte(struct psmouse *psmouse)
{
	struct input_dev *dev = psmouse->dev;
	struct fsp_data *ad = psmouse->private;
	unsigned char *packet = psmouse->packet;
	unsigned char button_status = 0, lscroll = 0, rscroll = 0;
	int rel_x, rel_y;

	if (psmouse->pktcnt < 4)
		return PSMOUSE_GOOD_DATA;

	/*
	 * Full packet accumulated, process it
	 */

	switch (psmouse->packet[0] >> FSP_PKT_TYPE_SHIFT) {
	case FSP_PKT_TYPE_ABS:
		dev_warn(&psmouse->ps2dev.serio->dev,
			 "Unexpected absolute mode packet, ignored.\n");
		break;

	case FSP_PKT_TYPE_NORMAL_OPC:
		/* on-pad click, filter it if necessary */
		if ((ad->flags & FSPDRV_FLAG_EN_OPC) != FSPDRV_FLAG_EN_OPC)
			packet[0] &= ~BIT(0);
		/* fall through */

	case FSP_PKT_TYPE_NORMAL:
		/* normal packet */
		/* special packet data translation from on-pad packets */
		if (packet[3] != 0) {
			if (packet[3] & BIT(0))
				button_status |= 0x01;	/* wheel down */
			if (packet[3] & BIT(1))
				button_status |= 0x0f;	/* wheel up */
			if (packet[3] & BIT(2))
				button_status |= BIT(4);/* horizontal left */
			if (packet[3] & BIT(3))
				button_status |= BIT(5);/* horizontal right */
			/* push back to packet queue */
			if (button_status != 0)
				packet[3] = button_status;
			rscroll = (packet[3] >> 4) & 1;
			lscroll = (packet[3] >> 5) & 1;
		}
		/*
		 * Processing wheel up/down and extra button events
		 */
		input_report_rel(dev, REL_WHEEL,
				 (int)(packet[3] & 8) - (int)(packet[3] & 7));
		input_report_rel(dev, REL_HWHEEL, lscroll - rscroll);
		input_report_key(dev, BTN_BACK, lscroll);
		input_report_key(dev, BTN_FORWARD, rscroll);

		/*
		 * Standard PS/2 Mouse
		 */
		input_report_key(dev, BTN_LEFT, packet[0] & 1);
		input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
		input_report_key(dev, BTN_RIGHT, (packet[0] >> 1) & 1);

		rel_x = packet[1] ? (int)packet[1] - (int)((packet[0] << 4) & 0x100) : 0;
		rel_y = packet[2] ? (int)((packet[0] << 3) & 0x100) - (int)packet[2] : 0;

		input_report_rel(dev, REL_X, rel_x);
		input_report_rel(dev, REL_Y, rel_y);
		break;
	}

	input_sync(dev);

	fsp_packet_debug(packet);

	return PSMOUSE_FULL_PACKET;
}

static int fsp_activate_protocol(struct psmouse *psmouse)
{
	struct fsp_data *pad = psmouse->private;
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[2];
	int val;

	/*
	 * Standard procedure to enter FSP Intellimouse mode
	 * (scrolling wheel, 4th and 5th buttons)
	 */
	param[0] = 200;
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
	param[0] = 200;
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
	param[0] =  80;
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);

	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
	if (param[0] != 0x04) {
		dev_err(&psmouse->ps2dev.serio->dev,
			"Unable to enable 4 bytes packet format.\n");
		return -EIO;
	}

	if (fsp_reg_read(psmouse, FSP_REG_SYSCTL5, &val)) {
		dev_err(&psmouse->ps2dev.serio->dev,
			"Unable to read SYSCTL5 register.\n");
		return -EIO;
	}

	val &= ~(FSP_BIT_EN_MSID7 | FSP_BIT_EN_MSID8 | FSP_BIT_EN_AUTO_MSID8);
	/* Ensure we are not in absolute mode */
	val &= ~FSP_BIT_EN_PKT_G0;
	if (pad->buttons == 0x06) {
		/* Left/Middle/Right & Scroll Up/Down/Right/Left */
		val |= FSP_BIT_EN_MSID6;
	}

	if (fsp_reg_write(psmouse, FSP_REG_SYSCTL5, val)) {
		dev_err(&psmouse->ps2dev.serio->dev,
			"Unable to set up required mode bits.\n");
		return -EIO;
	}

	/*
	 * Enable OPC tags such that driver can tell the difference between
	 * on-pad and real button click
	 */
	if (fsp_opc_tag_enable(psmouse, true))
		dev_warn(&psmouse->ps2dev.serio->dev,
			 "Failed to enable OPC tag mode.\n");

	/* Enable on-pad vertical and horizontal scrolling */
	fsp_onpad_vscr(psmouse, true);
	fsp_onpad_hscr(psmouse, true);

	return 0;
}

int fsp_detect(struct psmouse *psmouse, bool set_properties)
{
	int id;

	if (fsp_reg_read(psmouse, FSP_REG_DEVICE_ID, &id))
		return -EIO;

	if (id != 0x01)
		return -ENODEV;

	if (set_properties) {
		psmouse->vendor = "Sentelic";
		psmouse->name = "FingerSensingPad";
	}

	return 0;
}

static void fsp_reset(struct psmouse *psmouse)
{
	fsp_opc_tag_enable(psmouse, false);
	fsp_onpad_vscr(psmouse, false);
	fsp_onpad_hscr(psmouse, false);
}

static void fsp_disconnect(struct psmouse *psmouse)
{
	sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
			   &fsp_attribute_group);

	fsp_reset(psmouse);
	kfree(psmouse->private);
}

static int fsp_reconnect(struct psmouse *psmouse)
{
	int version;

	if (fsp_detect(psmouse, 0))
		return -ENODEV;

	if (fsp_get_version(psmouse, &version))
		return -ENODEV;

	if (fsp_activate_protocol(psmouse))
		return -EIO;

	return 0;
}

int fsp_init(struct psmouse *psmouse)
{
	struct fsp_data *priv;
	int ver, rev, buttons;
	int error;

	if (fsp_get_version(psmouse, &ver) ||
	    fsp_get_revision(psmouse, &rev) ||
	    fsp_get_buttons(psmouse, &buttons)) {
		return -ENODEV;
	}

	psmouse_info(psmouse,
		     "Finger Sensing Pad, hw: %d.%d.%d, sw: %s, buttons: %d\n",
		     ver >> 4, ver & 0x0F, rev, fsp_drv_ver, buttons & 7);

	psmouse->private = priv = kzalloc(sizeof(struct fsp_data), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->ver = ver;
	priv->rev = rev;
	priv->buttons = buttons;

	/* enable on-pad click by default */
	priv->flags |= FSPDRV_FLAG_EN_OPC;

	/* Set up various supported input event bits */
	__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
	__set_bit(BTN_BACK, psmouse->dev->keybit);
	__set_bit(BTN_FORWARD, psmouse->dev->keybit);
	__set_bit(REL_WHEEL, psmouse->dev->relbit);
	__set_bit(REL_HWHEEL, psmouse->dev->relbit);

	psmouse->protocol_handler = fsp_process_byte;
	psmouse->disconnect = fsp_disconnect;
	psmouse->reconnect = fsp_reconnect;
	psmouse->cleanup = fsp_reset;
	psmouse->pktsize = 4;

	/* set default packet output based on number of buttons we found */
	error = fsp_activate_protocol(psmouse);
	if (error)
		goto err_out;

	error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
				   &fsp_attribute_group);
	if (error) {
		dev_err(&psmouse->ps2dev.serio->dev,
			"Failed to create sysfs attributes (%d)", error);
		goto err_out;
	}

	return 0;

 err_out:
	kfree(psmouse->private);
	psmouse->private = NULL;
	return error;
}