summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/adp5588-keys.c
blob: 61e8e43e9c2bbd423445a4bff2ce7f15f6070366 (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
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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * File: drivers/input/keyboard/adp5588_keys.c
 * Description:  keypad driver for ADP5588 and ADP5587
 *		 I2C QWERTY Keypad and IO Expander
 * Bugs: Enter bugs at http://blackfin.uclinux.org/
 *
 * Copyright (C) 2008-2010 Analog Devices Inc.
 */

#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/matrix_keypad.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/ktime.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/timekeeping.h>

#define DEV_ID 0x00		/* Device ID */
#define CFG 0x01		/* Configuration Register1 */
#define INT_STAT 0x02		/* Interrupt Status Register */
#define KEY_LCK_EC_STAT 0x03	/* Key Lock and Event Counter Register */
#define KEY_EVENTA 0x04		/* Key Event Register A */
#define KEY_EVENTB 0x05		/* Key Event Register B */
#define KEY_EVENTC 0x06		/* Key Event Register C */
#define KEY_EVENTD 0x07		/* Key Event Register D */
#define KEY_EVENTE 0x08		/* Key Event Register E */
#define KEY_EVENTF 0x09		/* Key Event Register F */
#define KEY_EVENTG 0x0A		/* Key Event Register G */
#define KEY_EVENTH 0x0B		/* Key Event Register H */
#define KEY_EVENTI 0x0C		/* Key Event Register I */
#define KEY_EVENTJ 0x0D		/* Key Event Register J */
#define KP_LCK_TMR 0x0E		/* Keypad Lock1 to Lock2 Timer */
#define UNLOCK1 0x0F		/* Unlock Key1 */
#define UNLOCK2 0x10		/* Unlock Key2 */
#define GPIO_INT_STAT1 0x11	/* GPIO Interrupt Status */
#define GPIO_INT_STAT2 0x12	/* GPIO Interrupt Status */
#define GPIO_INT_STAT3 0x13	/* GPIO Interrupt Status */
#define GPIO_DAT_STAT1 0x14	/* GPIO Data Status, Read twice to clear */
#define GPIO_DAT_STAT2 0x15	/* GPIO Data Status, Read twice to clear */
#define GPIO_DAT_STAT3 0x16	/* GPIO Data Status, Read twice to clear */
#define GPIO_DAT_OUT1 0x17	/* GPIO DATA OUT */
#define GPIO_DAT_OUT2 0x18	/* GPIO DATA OUT */
#define GPIO_DAT_OUT3 0x19	/* GPIO DATA OUT */
#define GPIO_INT_EN1 0x1A	/* GPIO Interrupt Enable */
#define GPIO_INT_EN2 0x1B	/* GPIO Interrupt Enable */
#define GPIO_INT_EN3 0x1C	/* GPIO Interrupt Enable */
#define KP_GPIO1 0x1D		/* Keypad or GPIO Selection */
#define KP_GPIO2 0x1E		/* Keypad or GPIO Selection */
#define KP_GPIO3 0x1F		/* Keypad or GPIO Selection */
#define GPI_EM1 0x20		/* GPI Event Mode 1 */
#define GPI_EM2 0x21		/* GPI Event Mode 2 */
#define GPI_EM3 0x22		/* GPI Event Mode 3 */
#define GPIO_DIR1 0x23		/* GPIO Data Direction */
#define GPIO_DIR2 0x24		/* GPIO Data Direction */
#define GPIO_DIR3 0x25		/* GPIO Data Direction */
#define GPIO_INT_LVL1 0x26	/* GPIO Edge/Level Detect */
#define GPIO_INT_LVL2 0x27	/* GPIO Edge/Level Detect */
#define GPIO_INT_LVL3 0x28	/* GPIO Edge/Level Detect */
#define DEBOUNCE_DIS1 0x29	/* Debounce Disable */
#define DEBOUNCE_DIS2 0x2A	/* Debounce Disable */
#define DEBOUNCE_DIS3 0x2B	/* Debounce Disable */
#define GPIO_PULL1 0x2C		/* GPIO Pull Disable */
#define GPIO_PULL2 0x2D		/* GPIO Pull Disable */
#define GPIO_PULL3 0x2E		/* GPIO Pull Disable */
#define CMP_CFG_STAT 0x30	/* Comparator Configuration and Status Register */
#define CMP_CONFG_SENS1 0x31	/* Sensor1 Comparator Configuration Register */
#define CMP_CONFG_SENS2 0x32	/* L2 Light Sensor Reference Level, Output Falling for Sensor 1 */
#define CMP1_LVL2_TRIP 0x33	/* L2 Light Sensor Hysteresis (Active when Output Rising) for Sensor 1 */
#define CMP1_LVL2_HYS 0x34	/* L3 Light Sensor Reference Level, Output Falling For Sensor 1 */
#define CMP1_LVL3_TRIP 0x35	/* L3 Light Sensor Hysteresis (Active when Output Rising) For Sensor 1 */
#define CMP1_LVL3_HYS 0x36	/* Sensor 2 Comparator Configuration Register */
#define CMP2_LVL2_TRIP 0x37	/* L2 Light Sensor Reference Level, Output Falling for Sensor 2 */
#define CMP2_LVL2_HYS 0x38	/* L2 Light Sensor Hysteresis (Active when Output Rising) for Sensor 2 */
#define CMP2_LVL3_TRIP 0x39	/* L3 Light Sensor Reference Level, Output Falling For Sensor 2 */
#define CMP2_LVL3_HYS 0x3A	/* L3 Light Sensor Hysteresis (Active when Output Rising) For Sensor 2 */
#define CMP1_ADC_DAT_R1 0x3B	/* Comparator 1 ADC data Register1 */
#define CMP1_ADC_DAT_R2 0x3C	/* Comparator 1 ADC data Register2 */
#define CMP2_ADC_DAT_R1 0x3D	/* Comparator 2 ADC data Register1 */
#define CMP2_ADC_DAT_R2 0x3E	/* Comparator 2 ADC data Register2 */

#define ADP5588_DEVICE_ID_MASK	0xF

 /* Configuration Register1 */
#define ADP5588_AUTO_INC	BIT(7)
#define ADP5588_GPIEM_CFG	BIT(6)
#define ADP5588_OVR_FLOW_M	BIT(5)
#define ADP5588_INT_CFG		BIT(4)
#define ADP5588_OVR_FLOW_IEN	BIT(3)
#define ADP5588_K_LCK_IM	BIT(2)
#define ADP5588_GPI_IEN		BIT(1)
#define ADP5588_KE_IEN		BIT(0)

/* Interrupt Status Register */
#define ADP5588_CMP2_INT	BIT(5)
#define ADP5588_CMP1_INT	BIT(4)
#define ADP5588_OVR_FLOW_INT	BIT(3)
#define ADP5588_K_LCK_INT	BIT(2)
#define ADP5588_GPI_INT		BIT(1)
#define ADP5588_KE_INT		BIT(0)

/* Key Lock and Event Counter Register */
#define ADP5588_K_LCK_EN	BIT(6)
#define ADP5588_LCK21		0x30
#define ADP5588_KEC		GENMASK(3, 0)

#define ADP5588_MAXGPIO		18
#define ADP5588_BANK(offs)	((offs) >> 3)
#define ADP5588_BIT(offs)	(1u << ((offs) & 0x7))

/* Put one of these structures in i2c_board_info platform_data */

/*
 * 128 so it fits matrix-keymap maximum number of keys when the full
 * 10cols * 8rows are used.
 */
#define ADP5588_KEYMAPSIZE 128

#define GPI_PIN_ROW0 97
#define GPI_PIN_ROW1 98
#define GPI_PIN_ROW2 99
#define GPI_PIN_ROW3 100
#define GPI_PIN_ROW4 101
#define GPI_PIN_ROW5 102
#define GPI_PIN_ROW6 103
#define GPI_PIN_ROW7 104
#define GPI_PIN_COL0 105
#define GPI_PIN_COL1 106
#define GPI_PIN_COL2 107
#define GPI_PIN_COL3 108
#define GPI_PIN_COL4 109
#define GPI_PIN_COL5 110
#define GPI_PIN_COL6 111
#define GPI_PIN_COL7 112
#define GPI_PIN_COL8 113
#define GPI_PIN_COL9 114

#define GPI_PIN_ROW_BASE GPI_PIN_ROW0
#define GPI_PIN_ROW_END GPI_PIN_ROW7
#define GPI_PIN_COL_BASE GPI_PIN_COL0
#define GPI_PIN_COL_END GPI_PIN_COL9

#define GPI_PIN_BASE GPI_PIN_ROW_BASE
#define GPI_PIN_END GPI_PIN_COL_END

#define ADP5588_ROWS_MAX (GPI_PIN_ROW7 - GPI_PIN_ROW0 + 1)
#define ADP5588_COLS_MAX (GPI_PIN_COL9 - GPI_PIN_COL0 + 1)

#define ADP5588_GPIMAPSIZE_MAX (GPI_PIN_END - GPI_PIN_BASE + 1)

/* Key Event Register xy */
#define KEY_EV_PRESSED		BIT(7)
#define KEY_EV_MASK		GENMASK(6, 0)

#define KP_SEL(x)		(BIT(x) - 1)	/* 2^x-1 */

#define KEYP_MAX_EVENT		10

/*
 * Early pre 4.0 Silicon required to delay readout by at least 25ms,
 * since the Event Counter Register updated 25ms after the interrupt
 * asserted.
 */
#define WA_DELAYED_READOUT_REVID(rev)		((rev) < 4)
#define WA_DELAYED_READOUT_TIME			25

#define ADP5588_INVALID_HWIRQ	(~0UL)

struct adp5588_kpad {
	struct i2c_client *client;
	struct input_dev *input;
	ktime_t irq_time;
	unsigned long delay;
	u32 row_shift;
	u32 rows;
	u32 cols;
	u32 unlock_keys[2];
	int nkeys_unlock;
	unsigned short keycode[ADP5588_KEYMAPSIZE];
	unsigned char gpiomap[ADP5588_MAXGPIO];
	struct gpio_chip gc;
	struct mutex gpio_lock;	/* Protect cached dir, dat_out */
	u8 dat_out[3];
	u8 dir[3];
	u8 int_en[3];
	u8 irq_mask[3];
	u8 pull_dis[3];
};

static int adp5588_read(struct i2c_client *client, u8 reg)
{
	int ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0)
		dev_err(&client->dev, "Read Error\n");

	return ret;
}

static int adp5588_write(struct i2c_client *client, u8 reg, u8 val)
{
	return i2c_smbus_write_byte_data(client, reg, val);
}

static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned int off)
{
	struct adp5588_kpad *kpad = gpiochip_get_data(chip);
	unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
	unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
	int val;

	mutex_lock(&kpad->gpio_lock);

	if (kpad->dir[bank] & bit)
		val = kpad->dat_out[bank];
	else
		val = adp5588_read(kpad->client, GPIO_DAT_STAT1 + bank);

	mutex_unlock(&kpad->gpio_lock);

	return !!(val & bit);
}

static void adp5588_gpio_set_value(struct gpio_chip *chip,
				   unsigned int off, int val)
{
	struct adp5588_kpad *kpad = gpiochip_get_data(chip);
	unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
	unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);

	mutex_lock(&kpad->gpio_lock);

	if (val)
		kpad->dat_out[bank] |= bit;
	else
		kpad->dat_out[bank] &= ~bit;

	adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank, kpad->dat_out[bank]);

	mutex_unlock(&kpad->gpio_lock);
}

static int adp5588_gpio_set_config(struct gpio_chip *chip,  unsigned int off,
				   unsigned long config)
{
	struct adp5588_kpad *kpad = gpiochip_get_data(chip);
	unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
	unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
	bool pull_disable;
	int ret;

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_BIAS_PULL_UP:
		pull_disable = false;
		break;
	case PIN_CONFIG_BIAS_DISABLE:
		pull_disable = true;
		break;
	default:
		return -ENOTSUPP;
	}

	mutex_lock(&kpad->gpio_lock);

	if (pull_disable)
		kpad->pull_dis[bank] |= bit;
	else
		kpad->pull_dis[bank] &= bit;

	ret = adp5588_write(kpad->client, GPIO_PULL1 + bank,
			    kpad->pull_dis[bank]);

	mutex_unlock(&kpad->gpio_lock);

	return ret;
}

static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned int off)
{
	struct adp5588_kpad *kpad = gpiochip_get_data(chip);
	unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
	unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
	int ret;

	mutex_lock(&kpad->gpio_lock);

	kpad->dir[bank] &= ~bit;
	ret = adp5588_write(kpad->client, GPIO_DIR1 + bank, kpad->dir[bank]);

	mutex_unlock(&kpad->gpio_lock);

	return ret;
}

static int adp5588_gpio_direction_output(struct gpio_chip *chip,
					 unsigned int off, int val)
{
	struct adp5588_kpad *kpad = gpiochip_get_data(chip);
	unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
	unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
	int ret;

	mutex_lock(&kpad->gpio_lock);

	kpad->dir[bank] |= bit;

	if (val)
		kpad->dat_out[bank] |= bit;
	else
		kpad->dat_out[bank] &= ~bit;

	ret = adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank,
			    kpad->dat_out[bank]);
	if (ret)
		goto out_unlock;

	ret = adp5588_write(kpad->client, GPIO_DIR1 + bank, kpad->dir[bank]);

out_unlock:
	mutex_unlock(&kpad->gpio_lock);

	return ret;
}

static int adp5588_build_gpiomap(struct adp5588_kpad *kpad)
{
	bool pin_used[ADP5588_MAXGPIO];
	int n_unused = 0;
	int i;

	memset(pin_used, 0, sizeof(pin_used));

	for (i = 0; i < kpad->rows; i++)
		pin_used[i] = true;

	for (i = 0; i < kpad->cols; i++)
		pin_used[i + GPI_PIN_COL_BASE - GPI_PIN_BASE] = true;

	for (i = 0; i < ADP5588_MAXGPIO; i++)
		if (!pin_used[i])
			kpad->gpiomap[n_unused++] = i;

	return n_unused;
}

static void adp5588_irq_bus_lock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_kpad *kpad = gpiochip_get_data(gc);

	mutex_lock(&kpad->gpio_lock);
}

static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_kpad *kpad = gpiochip_get_data(gc);
	int i;

	for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
		if (kpad->int_en[i] ^ kpad->irq_mask[i]) {
			kpad->int_en[i] = kpad->irq_mask[i];
			adp5588_write(kpad->client, GPI_EM1 + i, kpad->int_en[i]);
		}
	}

	mutex_unlock(&kpad->gpio_lock);
}

static void adp5588_irq_mask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_kpad *kpad = gpiochip_get_data(gc);
	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	unsigned long real_irq = kpad->gpiomap[hwirq];

	kpad->irq_mask[ADP5588_BANK(real_irq)] &= ~ADP5588_BIT(real_irq);
	gpiochip_disable_irq(gc, hwirq);
}

static void adp5588_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_kpad *kpad = gpiochip_get_data(gc);
	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	unsigned long real_irq = kpad->gpiomap[hwirq];

	gpiochip_enable_irq(gc, hwirq);
	kpad->irq_mask[ADP5588_BANK(real_irq)] |= ADP5588_BIT(real_irq);
}

static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
{
	if (!(type & IRQ_TYPE_EDGE_BOTH))
		return -EINVAL;

	irq_set_handler_locked(d, handle_edge_irq);

	return 0;
}

static const struct irq_chip adp5588_irq_chip = {
	.name = "adp5588",
	.irq_mask = adp5588_irq_mask,
	.irq_unmask = adp5588_irq_unmask,
	.irq_bus_lock = adp5588_irq_bus_lock,
	.irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock,
	.irq_set_type = adp5588_irq_set_type,
	.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE,
	GPIOCHIP_IRQ_RESOURCE_HELPERS,
};

static int adp5588_gpio_add(struct adp5588_kpad *kpad)
{
	struct device *dev = &kpad->client->dev;
	struct gpio_irq_chip *girq;
	int i, error;

	kpad->gc.ngpio = adp5588_build_gpiomap(kpad);
	if (kpad->gc.ngpio == 0) {
		dev_info(dev, "No unused gpios left to export\n");
		return 0;
	}

	kpad->gc.parent = &kpad->client->dev;
	kpad->gc.direction_input = adp5588_gpio_direction_input;
	kpad->gc.direction_output = adp5588_gpio_direction_output;
	kpad->gc.get = adp5588_gpio_get_value;
	kpad->gc.set = adp5588_gpio_set_value;
	kpad->gc.set_config = adp5588_gpio_set_config;
	kpad->gc.can_sleep = 1;

	kpad->gc.base = -1;
	kpad->gc.label = kpad->client->name;
	kpad->gc.owner = THIS_MODULE;

	girq = &kpad->gc.irq;
	gpio_irq_chip_set_chip(girq, &adp5588_irq_chip);
	girq->handler = handle_bad_irq;
	girq->threaded = true;

	mutex_init(&kpad->gpio_lock);

	error = devm_gpiochip_add_data(dev, &kpad->gc, kpad);
	if (error) {
		dev_err(dev, "gpiochip_add failed: %d\n", error);
		return error;
	}

	for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
		kpad->dat_out[i] = adp5588_read(kpad->client,
						GPIO_DAT_OUT1 + i);
		kpad->dir[i] = adp5588_read(kpad->client, GPIO_DIR1 + i);
		kpad->pull_dis[i] = adp5588_read(kpad->client, GPIO_PULL1 + i);
	}

	return 0;
}

static unsigned long adp5588_gpiomap_get_hwirq(struct device *dev,
					       const u8 *map, unsigned int gpio,
					       unsigned int ngpios)
{
	unsigned int hwirq;

	for (hwirq = 0; hwirq < ngpios; hwirq++)
		if (map[hwirq] == gpio)
			return hwirq;

	/* should never happen */
	dev_warn_ratelimited(dev, "could not find the hwirq for gpio(%u)\n", gpio);

	return ADP5588_INVALID_HWIRQ;
}

static void adp5588_gpio_irq_handle(struct adp5588_kpad *kpad, int key_val,
				    int key_press)
{
	unsigned int irq, gpio = key_val - GPI_PIN_BASE, irq_type;
	struct i2c_client *client = kpad->client;
	struct irq_data *irqd;
	unsigned long hwirq;

	hwirq = adp5588_gpiomap_get_hwirq(&client->dev, kpad->gpiomap,
					  gpio, kpad->gc.ngpio);
	if (hwirq == ADP5588_INVALID_HWIRQ) {
		dev_err(&client->dev, "Could not get hwirq for key(%u)\n", key_val);
		return;
	}

	irq = irq_find_mapping(kpad->gc.irq.domain, hwirq);
	if (!irq)
		return;

	irqd = irq_get_irq_data(irq);
	if (!irqd) {
		dev_err(&client->dev, "Could not get irq(%u) data\n", irq);
		return;
	}

	irq_type = irqd_get_trigger_type(irqd);

	/*
	 * Default is active low which means key_press is asserted on
	 * the falling edge.
	 */
	if ((irq_type & IRQ_TYPE_EDGE_RISING && !key_press) ||
	    (irq_type & IRQ_TYPE_EDGE_FALLING && key_press))
		handle_nested_irq(irq);
}

static void adp5588_report_events(struct adp5588_kpad *kpad, int ev_cnt)
{
	int i;

	for (i = 0; i < ev_cnt; i++) {
		int key = adp5588_read(kpad->client, KEY_EVENTA + i);
		int key_val = key & KEY_EV_MASK;
		int key_press = key & KEY_EV_PRESSED;

		if (key_val >= GPI_PIN_BASE && key_val <= GPI_PIN_END) {
			/* gpio line used as IRQ source */
			adp5588_gpio_irq_handle(kpad, key_val, key_press);
		} else {
			int row = (key_val - 1) / ADP5588_COLS_MAX;
			int col =  (key_val - 1) % ADP5588_COLS_MAX;
			int code = MATRIX_SCAN_CODE(row, col, kpad->row_shift);

			dev_dbg_ratelimited(&kpad->client->dev,
					    "report key(%d) r(%d) c(%d) code(%d)\n",
					    key_val, row, col, kpad->keycode[code]);

			input_report_key(kpad->input,
					 kpad->keycode[code], key_press);
		}
	}
}

static irqreturn_t adp5588_hard_irq(int irq, void *handle)
{
	struct adp5588_kpad *kpad = handle;

	kpad->irq_time = ktime_get();

	return IRQ_WAKE_THREAD;
}

static irqreturn_t adp5588_thread_irq(int irq, void *handle)
{
	struct adp5588_kpad *kpad = handle;
	struct i2c_client *client = kpad->client;
	ktime_t target_time, now;
	unsigned long delay;
	int status, ev_cnt;

	/*
	 * Readout needs to wait for at least 25ms after the notification
	 * for REVID < 4.
	 */
	if (kpad->delay) {
		target_time = ktime_add_ms(kpad->irq_time, kpad->delay);
		now = ktime_get();
		if (ktime_before(now, target_time)) {
			delay = ktime_to_us(ktime_sub(target_time, now));
			usleep_range(delay, delay + 1000);
		}
	}

	status = adp5588_read(client, INT_STAT);

	if (status & ADP5588_OVR_FLOW_INT)	/* Unlikely and should never happen */
		dev_err(&client->dev, "Event Overflow Error\n");

	if (status & ADP5588_KE_INT) {
		ev_cnt = adp5588_read(client, KEY_LCK_EC_STAT) & ADP5588_KEC;
		if (ev_cnt) {
			adp5588_report_events(kpad, ev_cnt);
			input_sync(kpad->input);
		}
	}

	adp5588_write(client, INT_STAT, status); /* Status is W1C */

	return IRQ_HANDLED;
}

static int adp5588_setup(struct adp5588_kpad *kpad)
{
	struct i2c_client *client = kpad->client;
	int i, ret;

	ret = adp5588_write(client, KP_GPIO1, KP_SEL(kpad->rows));
	if (ret)
		return ret;

	ret = adp5588_write(client, KP_GPIO2, KP_SEL(kpad->cols) & 0xFF);
	if (ret)
		return ret;

	ret = adp5588_write(client, KP_GPIO3, KP_SEL(kpad->cols) >> 8);
	if (ret)
		return ret;

	for (i = 0; i < kpad->nkeys_unlock; i++) {
		ret = adp5588_write(client, UNLOCK1 + i, kpad->unlock_keys[i]);
		if (ret)
			return ret;
	}

	if (kpad->nkeys_unlock) {
		ret = adp5588_write(client, KEY_LCK_EC_STAT, ADP5588_K_LCK_EN);
		if (ret)
			return ret;
	}

	for (i = 0; i < KEYP_MAX_EVENT; i++) {
		ret = adp5588_read(client, KEY_EVENTA);
		if (ret)
			return ret;
	}

	ret = adp5588_write(client, INT_STAT,
			    ADP5588_CMP2_INT | ADP5588_CMP1_INT |
			    ADP5588_OVR_FLOW_INT | ADP5588_K_LCK_INT |
			    ADP5588_GPI_INT | ADP5588_KE_INT); /* Status is W1C */
	if (ret)
		return ret;

	return adp5588_write(client, CFG, ADP5588_INT_CFG |
			     ADP5588_OVR_FLOW_IEN | ADP5588_KE_IEN);
}

static int adp5588_fw_parse(struct adp5588_kpad *kpad)
{
	struct i2c_client *client = kpad->client;
	int ret, i;

	ret = matrix_keypad_parse_properties(&client->dev, &kpad->rows,
					     &kpad->cols);
	if (ret)
		return ret;

	if (kpad->rows > ADP5588_ROWS_MAX || kpad->cols > ADP5588_COLS_MAX) {
		dev_err(&client->dev, "Invalid nr of rows(%u) or cols(%u)\n",
			kpad->rows, kpad->cols);
		return -EINVAL;
	}

	ret = matrix_keypad_build_keymap(NULL, NULL, kpad->rows, kpad->cols,
					 kpad->keycode, kpad->input);
	if (ret)
		return ret;

	kpad->row_shift = get_count_order(kpad->cols);

	if (device_property_read_bool(&client->dev, "autorepeat"))
		__set_bit(EV_REP, kpad->input->evbit);

	kpad->nkeys_unlock = device_property_count_u32(&client->dev,
						       "adi,unlock-keys");
	if (kpad->nkeys_unlock <= 0) {
		/* so that we don't end up enabling key lock */
		kpad->nkeys_unlock = 0;
		return 0;
	}

	if (kpad->nkeys_unlock > ARRAY_SIZE(kpad->unlock_keys)) {
		dev_err(&client->dev, "number of unlock keys(%d) > (%zu)\n",
			kpad->nkeys_unlock, ARRAY_SIZE(kpad->unlock_keys));
		return -EINVAL;
	}

	ret = device_property_read_u32_array(&client->dev, "adi,unlock-keys",
					     kpad->unlock_keys,
					     kpad->nkeys_unlock);
	if (ret)
		return ret;

	for (i = 0; i < kpad->nkeys_unlock; i++) {
		/*
		 * Even though it should be possible (as stated in the datasheet)
		 * to use GPIs (which are part of the keys event) as unlock keys,
		 * it was not working at all and was leading to overflow events
		 * at some point. Hence, for now, let's just allow keys which are
		 * part of keypad matrix to be used and if a reliable way of
		 * using GPIs is found, this condition can be removed/lightened.
		 */
		if (kpad->unlock_keys[i] >= kpad->cols * kpad->rows) {
			dev_err(&client->dev, "Invalid unlock key(%d)\n",
				kpad->unlock_keys[i]);
			return -EINVAL;
		}

		/*
		 * Firmware properties keys start from 0 but on the device they
		 * start from 1.
		 */
		kpad->unlock_keys[i] += 1;
	}

	return 0;
}

static int adp5588_probe(struct i2c_client *client)
{
	struct adp5588_kpad *kpad;
	struct input_dev *input;
	struct gpio_desc *gpio;
	unsigned int revid;
	int ret;
	int error;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
		return -EIO;
	}

	kpad = devm_kzalloc(&client->dev, sizeof(*kpad), GFP_KERNEL);
	if (!kpad)
		return -ENOMEM;

	input = devm_input_allocate_device(&client->dev);
	if (!input)
		return -ENOMEM;

	kpad->client = client;
	kpad->input = input;

	error = adp5588_fw_parse(kpad);
	if (error)
		return error;

	error = devm_regulator_get_enable(&client->dev, "vcc");
	if (error)
		return error;

	gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(gpio))
		return PTR_ERR(gpio);

	if (gpio) {
		fsleep(30);
		gpiod_set_value_cansleep(gpio, 0);
		fsleep(60);
	}

	ret = adp5588_read(client, DEV_ID);
	if (ret < 0)
		return ret;

	revid = ret & ADP5588_DEVICE_ID_MASK;
	if (WA_DELAYED_READOUT_REVID(revid))
		kpad->delay = msecs_to_jiffies(WA_DELAYED_READOUT_TIME);

	input->name = client->name;
	input->phys = "adp5588-keys/input0";

	input_set_drvdata(input, kpad);

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

	error = input_register_device(input);
	if (error) {
		dev_err(&client->dev, "unable to register input device: %d\n",
			error);
		return error;
	}

	error = adp5588_setup(kpad);
	if (error)
		return error;

	error = adp5588_gpio_add(kpad);
	if (error)
		return error;

	error = devm_request_threaded_irq(&client->dev, client->irq,
					  adp5588_hard_irq, adp5588_thread_irq,
					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					  client->dev.driver->name, kpad);
	if (error) {
		dev_err(&client->dev, "failed to request irq %d: %d\n",
			client->irq, error);
		return error;
	}

	dev_info(&client->dev, "Rev.%d keypad, irq %d\n", revid, client->irq);
	return 0;
}

static void adp5588_remove(struct i2c_client *client)
{
	adp5588_write(client, CFG, 0);

	/* all resources will be freed by devm */
}

static int adp5588_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	disable_irq(client->irq);

	return 0;
}

static int adp5588_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	enable_irq(client->irq);

	return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(adp5588_dev_pm_ops, adp5588_suspend, adp5588_resume);

static const struct i2c_device_id adp5588_id[] = {
	{ "adp5588-keys", 0 },
	{ "adp5587-keys", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adp5588_id);

static const struct of_device_id adp5588_of_match[] = {
	{ .compatible = "adi,adp5588" },
	{ .compatible = "adi,adp5587" },
	{}
};
MODULE_DEVICE_TABLE(of, adp5588_of_match);

static struct i2c_driver adp5588_driver = {
	.driver = {
		.name = KBUILD_MODNAME,
		.of_match_table = adp5588_of_match,
		.pm   = pm_sleep_ptr(&adp5588_dev_pm_ops),
	},
	.probe    = adp5588_probe,
	.remove   = adp5588_remove,
	.id_table = adp5588_id,
};

module_i2c_driver(adp5588_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("ADP5588/87 Keypad driver");