aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/pmic8xxx-keypad.c
blob: f2e8b9a347df94ce41f35d47731c04d868db5bfe (plain) (blame)
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
/* Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/mutex.h>

#include <linux/mfd/pm8xxx/core.h>
#include <linux/mfd/pm8xxx/gpio.h>
#include <linux/input/pmic8xxx-keypad.h>

#define PM8XXX_MAX_ROWS		18
#define PM8XXX_MAX_COLS		8
#define PM8XXX_ROW_SHIFT	3
#define PM8XXX_MATRIX_MAX_SIZE	(PM8XXX_MAX_ROWS * PM8XXX_MAX_COLS)

#define PM8XXX_MIN_ROWS		5
#define PM8XXX_MIN_COLS		5

#define MAX_SCAN_DELAY		128
#define MIN_SCAN_DELAY		1

/* in nanoseconds */
#define MAX_ROW_HOLD_DELAY	122000
#define MIN_ROW_HOLD_DELAY	30500

#define MAX_DEBOUNCE_TIME	20
#define MIN_DEBOUNCE_TIME	5

#define KEYP_CTRL			0x148

#define KEYP_CTRL_EVNTS			BIT(0)
#define KEYP_CTRL_EVNTS_MASK		0x3

#define KEYP_CTRL_SCAN_COLS_SHIFT	5
#define KEYP_CTRL_SCAN_COLS_MIN		5
#define KEYP_CTRL_SCAN_COLS_BITS	0x3

#define KEYP_CTRL_SCAN_ROWS_SHIFT	2
#define KEYP_CTRL_SCAN_ROWS_MIN		5
#define KEYP_CTRL_SCAN_ROWS_BITS	0x7

#define KEYP_CTRL_KEYP_EN		BIT(7)

#define KEYP_SCAN			0x149

#define KEYP_SCAN_READ_STATE		BIT(0)
#define KEYP_SCAN_DBOUNCE_SHIFT		1
#define KEYP_SCAN_PAUSE_SHIFT		3
#define KEYP_SCAN_ROW_HOLD_SHIFT	6

#define KEYP_TEST			0x14A

#define KEYP_TEST_CLEAR_RECENT_SCAN	BIT(6)
#define KEYP_TEST_CLEAR_OLD_SCAN	BIT(5)
#define KEYP_TEST_READ_RESET		BIT(4)
#define KEYP_TEST_DTEST_EN		BIT(3)
#define KEYP_TEST_ABORT_READ		BIT(0)

#define KEYP_TEST_DBG_SELECT_SHIFT	1

/* bits of these registers represent
 * '0' for key press
 * '1' for key release
 */
#define KEYP_RECENT_DATA		0x14B
#define KEYP_OLD_DATA			0x14C

#define KEYP_CLOCK_FREQ			32768

/**
 * struct pmic8xxx_kp - internal keypad data structure
 * @pdata - keypad platform data pointer
 * @input - input device pointer for keypad
 * @key_sense_irq - key press/release irq number
 * @key_stuck_irq - key stuck notification irq number
 * @keycodes - array to hold the key codes
 * @dev - parent device pointer
 * @keystate - present key press/release state
 * @stuckstate - present state when key stuck irq
 * @ctrl_reg - control register value
 */
struct pmic8xxx_kp {
	const struct pm8xxx_keypad_platform_data *pdata;
	struct input_dev *input;
	int key_sense_irq;
	int key_stuck_irq;

	unsigned short keycodes[PM8XXX_MATRIX_MAX_SIZE];

	struct device *dev;
	u16 keystate[PM8XXX_MAX_ROWS];
	u16 stuckstate[PM8XXX_MAX_ROWS];

	u8 ctrl_reg;
};

static int pmic8xxx_kp_write_u8(struct pmic8xxx_kp *kp,
				 u8 data, u16 reg)
{
	int rc;

	rc = pm8xxx_writeb(kp->dev->parent, reg, data);
	return rc;
}

static int pmic8xxx_kp_read(struct pmic8xxx_kp *kp,
				 u8 *data, u16 reg, unsigned num_bytes)
{
	int rc;

	rc = pm8xxx_read_buf(kp->dev->parent, reg, data, num_bytes);
	return rc;
}

static int pmic8xxx_kp_read_u8(struct pmic8xxx_kp *kp,
				 u8 *data, u16 reg)
{
	int rc;

	rc = pmic8xxx_kp_read(kp, data, reg, 1);
	return rc;
}

static u8 pmic8xxx_col_state(struct pmic8xxx_kp *kp, u8 col)
{
	/* all keys pressed on that particular row? */
	if (col == 0x00)
		return 1 << kp->pdata->num_cols;
	else
		return col & ((1 << kp->pdata->num_cols) - 1);
}

/*
 * Synchronous read protocol for RevB0 onwards:
 *
 * 1. Write '1' to ReadState bit in KEYP_SCAN register
 * 2. Wait 2*32KHz clocks, so that HW can successfully enter read mode
 *    synchronously
 * 3. Read rows in old array first if events are more than one
 * 4. Read rows in recent array
 * 5. Wait 4*32KHz clocks
 * 6. Write '0' to ReadState bit of KEYP_SCAN register so that hw can
 *    synchronously exit read mode.
 */
static int pmic8xxx_chk_sync_read(struct pmic8xxx_kp *kp)
{
	int rc;
	u8 scan_val;

	rc = pmic8xxx_kp_read_u8(kp, &scan_val, KEYP_SCAN);
	if (rc < 0) {
		dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
		return rc;
	}

	scan_val |= 0x1;

	rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
	if (rc < 0) {
		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
		return rc;
	}

	/* 2 * 32KHz clocks */
	udelay((2 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1);

	return rc;
}

static int pmic8xxx_kp_read_data(struct pmic8xxx_kp *kp, u16 *state,
					u16 data_reg, int read_rows)
{
	int rc, row;
	u8 new_data[PM8XXX_MAX_ROWS];

	rc = pmic8xxx_kp_read(kp, new_data, data_reg, read_rows);
	if (rc)
		return rc;

	for (row = 0; row < kp->pdata->num_rows; row++) {
		dev_dbg(kp->dev, "new_data[%d] = %d\n", row,
					new_data[row]);
		state[row] = pmic8xxx_col_state(kp, new_data[row]);
	}

	return rc;
}

static int pmic8xxx_kp_read_matrix(struct pmic8xxx_kp *kp, u16 *new_state,
					 u16 *old_state)
{
	int rc, read_rows;
	u8 scan_val;

	if (kp->pdata->num_rows < PM8XXX_MIN_ROWS)
		read_rows = PM8XXX_MIN_ROWS;
	else
		read_rows = kp->pdata->num_rows;

	pmic8xxx_chk_sync_read(kp);

	if (old_state) {
		rc = pmic8xxx_kp_read_data(kp, old_state, KEYP_OLD_DATA,
						read_rows);
		if (rc < 0) {
			dev_err(kp->dev,
				"Error reading KEYP_OLD_DATA, rc=%d\n", rc);
			return rc;
		}
	}

	rc = pmic8xxx_kp_read_data(kp, new_state, KEYP_RECENT_DATA,
					 read_rows);
	if (rc < 0) {
		dev_err(kp->dev,
			"Error reading KEYP_RECENT_DATA, rc=%d\n", rc);
		return rc;
	}

	/* 4 * 32KHz clocks */
	udelay((4 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1);

	rc = pmic8xxx_kp_read_u8(kp, &scan_val, KEYP_SCAN);
	if (rc < 0) {
		dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
		return rc;
	}

	scan_val &= 0xFE;
	rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
	if (rc < 0)
		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);

	return rc;
}

static void __pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, u16 *new_state,
					 u16 *old_state)
{
	int row, col, code;

	for (row = 0; row < kp->pdata->num_rows; row++) {
		int bits_changed = new_state[row] ^ old_state[row];

		if (!bits_changed)
			continue;

		for (col = 0; col < kp->pdata->num_cols; col++) {
			if (!(bits_changed & (1 << col)))
				continue;

			dev_dbg(kp->dev, "key [%d:%d] %s\n", row, col,
					!(new_state[row] & (1 << col)) ?
					"pressed" : "released");

			code = MATRIX_SCAN_CODE(row, col, PM8XXX_ROW_SHIFT);

			input_event(kp->input, EV_MSC, MSC_SCAN, code);
			input_report_key(kp->input,
					kp->keycodes[code],
					!(new_state[row] & (1 << col)));

			input_sync(kp->input);
		}
	}
}

static bool pmic8xxx_detect_ghost_keys(struct pmic8xxx_kp *kp, u16 *new_state)
{
	int row, found_first = -1;
	u16 check, row_state;

	check = 0;
	for (row = 0; row < kp->pdata->num_rows; row++) {
		row_state = (~new_state[row]) &
				 ((1 << kp->pdata->num_cols) - 1);

		if (hweight16(row_state) > 1) {
			if (found_first == -1)
				found_first = row;
			if (check & row_state) {
				dev_dbg(kp->dev, "detected ghost key on row[%d]"
					 " and row[%d]\n", found_first, row);
				return true;
			}
		}
		check |= row_state;
	}
	return false;
}

static int pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, unsigned int events)
{
	u16 new_state[PM8XXX_MAX_ROWS];
	u16 old_state[PM8XXX_MAX_ROWS];
	int rc;

	switch (events) {
	case 0x1:
		rc = pmic8xxx_kp_read_matrix(kp, new_state, NULL);
		if (rc < 0)
			return rc;

		/* detecting ghost key is not an error */
		if (pmic8xxx_detect_ghost_keys(kp, new_state))
			return 0;
		__pmic8xxx_kp_scan_matrix(kp, new_state, kp->keystate);
		memcpy(kp->keystate, new_state, sizeof(new_state));
	break;
	case 0x3: /* two events - eventcounter is gray-coded */
		rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
		if (rc < 0)
			return rc;

		__pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate);
		__pmic8xxx_kp_scan_matrix(kp, new_state, old_state);
		memcpy(kp->keystate, new_state, sizeof(new_state));
	break;
	case 0x2:
		dev_dbg(kp->dev, "Some key events were lost\n");
		rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
		if (rc < 0)
			return rc;
		__pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate);
		__pmic8xxx_kp_scan_matrix(kp, new_state, old_state);
		memcpy(kp->keystate, new_state, sizeof(new_state));
	break;
	default:
		rc = -EINVAL;
	}
	return rc;
}

/*
 * NOTE: We are reading recent and old data registers blindly
 * whenever key-stuck interrupt happens, because events counter doesn't
 * get updated when this interrupt happens due to key stuck doesn't get
 * considered as key state change.
 *
 * We are not using old data register contents after they are being read
 * because it might report the key which was pressed before the key being stuck
 * as stuck key because it's pressed status is stored in the old data
 * register.
 */
static irqreturn_t pmic8xxx_kp_stuck_irq(int irq, void *data)
{
	u16 new_state[PM8XXX_MAX_ROWS];
	u16 old_state[PM8XXX_MAX_ROWS];
	int rc;
	struct pmic8xxx_kp *kp = data;

	rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
	if (rc < 0) {
		dev_err(kp->dev, "failed to read keypad matrix\n");
		return IRQ_HANDLED;
	}

	__pmic8xxx_kp_scan_matrix(kp, new_state, kp->stuckstate);

	return IRQ_HANDLED;
}

static irqreturn_t pmic8xxx_kp_irq(int irq, void *data)
{
	struct pmic8xxx_kp *kp = data;
	u8 ctrl_val, events;
	int rc;

	rc = pmic8xxx_kp_read(kp, &ctrl_val, KEYP_CTRL, 1);
	if (rc < 0) {
		dev_err(kp->dev, "failed to read keyp_ctrl register\n");
		return IRQ_HANDLED;
	}

	events = ctrl_val & KEYP_CTRL_EVNTS_MASK;

	rc = pmic8xxx_kp_scan_matrix(kp, events);
	if (rc < 0)
		dev_err(kp->dev, "failed to scan matrix\n");

	return IRQ_HANDLED;
}

static int __devinit pmic8xxx_kpd_init(struct pmic8xxx_kp *kp)
{
	int bits, rc, cycles;
	u8 scan_val = 0, ctrl_val = 0;
	static const u8 row_bits[] = {
		0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7,
	};

	/* Find column bits */
	if (kp->pdata->num_cols < KEYP_CTRL_SCAN_COLS_MIN)
		bits = 0;
	else
		bits = kp->pdata->num_cols - KEYP_CTRL_SCAN_COLS_MIN;
	ctrl_val = (bits & KEYP_CTRL_SCAN_COLS_BITS) <<
		KEYP_CTRL_SCAN_COLS_SHIFT;

	/* Find row bits */
	if (kp->pdata->num_rows < KEYP_CTRL_SCAN_ROWS_MIN)
		bits = 0;
	else
		bits = row_bits[kp->pdata->num_rows - KEYP_CTRL_SCAN_ROWS_MIN];

	ctrl_val |= (bits << KEYP_CTRL_SCAN_ROWS_SHIFT);

	rc = pmic8xxx_kp_write_u8(kp, ctrl_val, KEYP_CTRL);
	if (rc < 0) {
		dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);
		return rc;
	}

	bits = (kp->pdata->debounce_ms / 5) - 1;

	scan_val |= (bits << KEYP_SCAN_DBOUNCE_SHIFT);

	bits = fls(kp->pdata->scan_delay_ms) - 1;
	scan_val |= (bits << KEYP_SCAN_PAUSE_SHIFT);

	/* Row hold time is a multiple of 32KHz cycles. */
	cycles = (kp->pdata->row_hold_ns * KEYP_CLOCK_FREQ) / NSEC_PER_SEC;

	scan_val |= (cycles << KEYP_SCAN_ROW_HOLD_SHIFT);

	rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
	if (rc)
		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);

	return rc;

}

static int  __devinit pmic8xxx_kp_config_gpio(int gpio_start, int num_gpios,
			struct pmic8xxx_kp *kp, struct pm_gpio *gpio_config)
{
	int	rc, i;

	if (gpio_start < 0 || num_gpios < 0)
		return -EINVAL;

	for (i = 0; i < num_gpios; i++) {
		rc = pm8xxx_gpio_config(gpio_start + i, gpio_config);
		if (rc) {
			dev_err(kp->dev, "%s: FAIL pm8xxx_gpio_config():"
					"for PM GPIO [%d] rc=%d.\n",
					__func__, gpio_start + i, rc);
			return rc;
		}
	 }

	return 0;
}

static int pmic8xxx_kp_enable(struct pmic8xxx_kp *kp)
{
	int rc;

	kp->ctrl_reg |= KEYP_CTRL_KEYP_EN;

	rc = pmic8xxx_kp_write_u8(kp, kp->ctrl_reg, KEYP_CTRL);
	if (rc < 0)
		dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);

	return rc;
}

static int pmic8xxx_kp_disable(struct pmic8xxx_kp *kp)
{
	int rc;

	kp->ctrl_reg &= ~KEYP_CTRL_KEYP_EN;

	rc = pmic8xxx_kp_write_u8(kp, kp->ctrl_reg, KEYP_CTRL);
	if (rc < 0)
		return rc;

	return rc;
}

static int pmic8xxx_kp_open(struct input_dev *dev)
{
	struct pmic8xxx_kp *kp = input_get_drvdata(dev);

	return pmic8xxx_kp_enable(kp);
}

static void pmic8xxx_kp_close(struct input_dev *dev)
{
	struct pmic8xxx_kp *kp = input_get_drvdata(dev);

	pmic8xxx_kp_disable(kp);
}

/*
 * keypad controller should be initialized in the following sequence
 * only, otherwise it might get into FSM stuck state.
 *
 * - Initialize keypad control parameters, like no. of rows, columns,
 *   timing values etc.,
 * - configure rows and column gpios pull up/down.
 * - set irq edge type.
 * - enable the keypad controller.
 */
static int __devinit pmic8xxx_kp_probe(struct platform_device *pdev)
{
	const struct pm8xxx_keypad_platform_data *pdata = mfd_get_data(pdev);
	const struct matrix_keymap_data *keymap_data;
	struct pmic8xxx_kp *kp;
	int rc;
	u8 ctrl_val;

	struct pm_gpio kypd_drv = {
		.direction	= PM_GPIO_DIR_OUT,
		.output_buffer	= PM_GPIO_OUT_BUF_OPEN_DRAIN,
		.output_value	= 0,
		.pull		= PM_GPIO_PULL_NO,
		.vin_sel	= PM_GPIO_VIN_S3,
		.out_strength	= PM_GPIO_STRENGTH_LOW,
		.function	= PM_GPIO_FUNC_1,
		.inv_int_pol	= 1,
	};

	struct pm_gpio kypd_sns = {
		.direction	= PM_GPIO_DIR_IN,
		.pull		= PM_GPIO_PULL_UP_31P5,
		.vin_sel	= PM_GPIO_VIN_S3,
		.out_strength	= PM_GPIO_STRENGTH_NO,
		.function	= PM_GPIO_FUNC_NORMAL,
		.inv_int_pol	= 1,
	};


	if (!pdata || !pdata->num_cols || !pdata->num_rows ||
		pdata->num_cols > PM8XXX_MAX_COLS ||
		pdata->num_rows > PM8XXX_MAX_ROWS ||
		pdata->num_cols < PM8XXX_MIN_COLS) {
		dev_err(&pdev->dev, "invalid platform data\n");
		return -EINVAL;
	}

	if (!pdata->scan_delay_ms ||
		pdata->scan_delay_ms > MAX_SCAN_DELAY ||
		pdata->scan_delay_ms < MIN_SCAN_DELAY ||
		!is_power_of_2(pdata->scan_delay_ms)) {
		dev_err(&pdev->dev, "invalid keypad scan time supplied\n");
		return -EINVAL;
	}

	if (!pdata->row_hold_ns ||
		pdata->row_hold_ns > MAX_ROW_HOLD_DELAY ||
		pdata->row_hold_ns < MIN_ROW_HOLD_DELAY ||
		((pdata->row_hold_ns % MIN_ROW_HOLD_DELAY) != 0)) {
		dev_err(&pdev->dev, "invalid keypad row hold time supplied\n");
		return -EINVAL;
	}

	if (!pdata->debounce_ms ||
		((pdata->debounce_ms % 5) != 0) ||
		pdata->debounce_ms > MAX_DEBOUNCE_TIME ||
		pdata->debounce_ms < MIN_DEBOUNCE_TIME) {
		dev_err(&pdev->dev, "invalid debounce time supplied\n");
		return -EINVAL;
	}

	keymap_data = pdata->keymap_data;
	if (!keymap_data) {
		dev_err(&pdev->dev, "no keymap data supplied\n");
		return -EINVAL;
	}

	kp = kzalloc(sizeof(*kp), GFP_KERNEL);
	if (!kp)
		return -ENOMEM;

	platform_set_drvdata(pdev, kp);

	kp->pdata	= pdata;
	kp->dev		= &pdev->dev;

	kp->input = input_allocate_device();
	if (!kp->input) {
		dev_err(&pdev->dev, "unable to allocate input device\n");
		rc = -ENOMEM;
		goto err_alloc_device;
	}

	kp->key_sense_irq = platform_get_irq(pdev, 0);
	if (kp->key_sense_irq < 0) {
		dev_err(&pdev->dev, "unable to get keypad sense irq\n");
		rc = -ENXIO;
		goto err_get_irq;
	}

	kp->key_stuck_irq = platform_get_irq(pdev, 1);
	if (kp->key_stuck_irq < 0) {
		dev_err(&pdev->dev, "unable to get keypad stuck irq\n");
		rc = -ENXIO;
		goto err_get_irq;
	}

	kp->input->name = pdata->input_name ? : "PMIC8XXX keypad";
	kp->input->phys = pdata->input_phys_device ? : "pmic8xxx_keypad/input0";

	kp->input->dev.parent	= &pdev->dev;

	kp->input->id.bustype	= BUS_I2C;
	kp->input->id.version	= 0x0001;
	kp->input->id.product	= 0x0001;
	kp->input->id.vendor	= 0x0001;

	kp->input->evbit[0]	= BIT_MASK(EV_KEY);

	if (pdata->rep)
		__set_bit(EV_REP, kp->input->evbit);

	kp->input->keycode	= kp->keycodes;
	kp->input->keycodemax	= PM8XXX_MATRIX_MAX_SIZE;
	kp->input->keycodesize	= sizeof(kp->keycodes);
	kp->input->open		= pmic8xxx_kp_open;
	kp->input->close	= pmic8xxx_kp_close;

	matrix_keypad_build_keymap(keymap_data, PM8XXX_ROW_SHIFT,
					kp->input->keycode, kp->input->keybit);

	input_set_capability(kp->input, EV_MSC, MSC_SCAN);
	input_set_drvdata(kp->input, kp);

	/* initialize keypad state */
	memset(kp->keystate, 0xff, sizeof(kp->keystate));
	memset(kp->stuckstate, 0xff, sizeof(kp->stuckstate));

	rc = pmic8xxx_kpd_init(kp);
	if (rc < 0) {
		dev_err(&pdev->dev, "unable to initialize keypad controller\n");
		goto err_get_irq;
	}

	rc = pmic8xxx_kp_config_gpio(pdata->cols_gpio_start,
					pdata->num_cols, kp, &kypd_sns);
	if (rc < 0) {
		dev_err(&pdev->dev, "unable to configure keypad sense lines\n");
		goto err_gpio_config;
	}

	rc = pmic8xxx_kp_config_gpio(pdata->rows_gpio_start,
					pdata->num_rows, kp, &kypd_drv);
	if (rc < 0) {
		dev_err(&pdev->dev, "unable to configure keypad drive lines\n");
		goto err_gpio_config;
	}

	rc = request_any_context_irq(kp->key_sense_irq, pmic8xxx_kp_irq,
				 IRQF_TRIGGER_RISING, "pmic-keypad", kp);
	if (rc < 0) {
		dev_err(&pdev->dev, "failed to request keypad sense irq\n");
		goto err_get_irq;
	}

	rc = request_any_context_irq(kp->key_stuck_irq, pmic8xxx_kp_stuck_irq,
				 IRQF_TRIGGER_RISING, "pmic-keypad-stuck", kp);
	if (rc < 0) {
		dev_err(&pdev->dev, "failed to request keypad stuck irq\n");
		goto err_req_stuck_irq;
	}

	rc = pmic8xxx_kp_read_u8(kp, &ctrl_val, KEYP_CTRL);
	if (rc < 0) {
		dev_err(&pdev->dev, "failed to read KEYP_CTRL register\n");
		goto err_pmic_reg_read;
	}

	kp->ctrl_reg = ctrl_val;

	rc = input_register_device(kp->input);
	if (rc < 0) {
		dev_err(&pdev->dev, "unable to register keypad input device\n");
		goto err_pmic_reg_read;
	}

	device_init_wakeup(&pdev->dev, pdata->wakeup);

	return 0;

err_pmic_reg_read:
	free_irq(kp->key_stuck_irq, kp);
err_req_stuck_irq:
	free_irq(kp->key_sense_irq, kp);
err_gpio_config:
err_get_irq:
	input_free_device(kp->input);
err_alloc_device:
	platform_set_drvdata(pdev, NULL);
	kfree(kp);
	return rc;
}

static int __devexit pmic8xxx_kp_remove(struct platform_device *pdev)
{
	struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);

	device_init_wakeup(&pdev->dev, 0);
	free_irq(kp->key_stuck_irq, kp);
	free_irq(kp->key_sense_irq, kp);
	input_unregister_device(kp->input);
	kfree(kp);

	platform_set_drvdata(pdev, NULL);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int pmic8xxx_kp_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);
	struct input_dev *input_dev = kp->input;

	if (device_may_wakeup(dev)) {
		enable_irq_wake(kp->key_sense_irq);
	} else {
		mutex_lock(&input_dev->mutex);

		if (input_dev->users)
			pmic8xxx_kp_disable(kp);

		mutex_unlock(&input_dev->mutex);
	}

	return 0;
}

static int pmic8xxx_kp_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);
	struct input_dev *input_dev = kp->input;

	if (device_may_wakeup(dev)) {
		disable_irq_wake(kp->key_sense_irq);
	} else {
		mutex_lock(&input_dev->mutex);

		if (input_dev->users)
			pmic8xxx_kp_enable(kp);

		mutex_unlock(&input_dev->mutex);
	}

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pm8xxx_kp_pm_ops,
			 pmic8xxx_kp_suspend, pmic8xxx_kp_resume);

static struct platform_driver pmic8xxx_kp_driver = {
	.probe		= pmic8xxx_kp_probe,
	.remove		= __devexit_p(pmic8xxx_kp_remove),
	.driver		= {
		.name = PM8XXX_KEYPAD_DEV_NAME,
		.owner = THIS_MODULE,
		.pm = &pm8xxx_kp_pm_ops,
	},
};

static int __init pmic8xxx_kp_init(void)
{
	return platform_driver_register(&pmic8xxx_kp_driver);
}
module_init(pmic8xxx_kp_init);

static void __exit pmic8xxx_kp_exit(void)
{
	platform_driver_unregister(&pmic8xxx_kp_driver);
}
module_exit(pmic8xxx_kp_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PMIC8XXX keypad driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:pmic8xxx_keypad");
MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");