summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpio-pca953x.c
blob: c55ad157e820028ecd072b8bb36f8fd7cb1faa2a (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
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
/*
 *  PCA953x 4/8/16/24/40 bit I/O ports
 *
 *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
 *  Copyright (C) 2007 Marvell International Ltd.
 *
 *  Derived from drivers/i2c/chips/pca9539.c
 *
 *  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; version 2 of the License.
 */

#include <linux/acpi.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_data/pca953x.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

#include <asm/unaligned.h>

#define PCA953X_INPUT		0x00
#define PCA953X_OUTPUT		0x01
#define PCA953X_INVERT		0x02
#define PCA953X_DIRECTION	0x03

#define REG_ADDR_AI		0x80

#define PCA957X_IN		0x00
#define PCA957X_INVRT		0x01
#define PCA957X_BKEN		0x02
#define PCA957X_PUPD		0x03
#define PCA957X_CFG		0x04
#define PCA957X_OUT		0x05
#define PCA957X_MSK		0x06
#define PCA957X_INTS		0x07

#define PCAL953X_OUT_STRENGTH	0x20
#define PCAL953X_IN_LATCH	0x22
#define PCAL953X_PULL_EN	0x23
#define PCAL953X_PULL_SEL	0x24
#define PCAL953X_INT_MASK	0x25
#define PCAL953X_INT_STAT	0x26
#define PCAL953X_OUT_CONF	0x27

#define PCAL6524_INT_EDGE	0x28
#define PCAL6524_INT_CLR	0x2a
#define PCAL6524_IN_STATUS	0x2b
#define PCAL6524_OUT_INDCONF	0x2c
#define PCAL6524_DEBOUNCE	0x2d

#define PCA_GPIO_MASK		0x00FF

#define PCAL_GPIO_MASK		0x1f
#define PCAL_PINCTRL_MASK	0xe0

#define PCA_INT			0x0100
#define PCA_PCAL		0x0200
#define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
#define PCA953X_TYPE		0x1000
#define PCA957X_TYPE		0x2000
#define PCA_TYPE_MASK		0xF000

#define PCA_CHIP_TYPE(x)	((x) & PCA_TYPE_MASK)

static const struct i2c_device_id pca953x_id[] = {
	{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
	{ "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9536", 4  | PCA953X_TYPE, },
	{ "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
	{ "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9556", 8  | PCA953X_TYPE, },
	{ "pca9557", 8  | PCA953X_TYPE, },
	{ "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
	{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
	{ "pca9698", 40 | PCA953X_TYPE, },

	{ "pcal6524", 24 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
	{ "pcal9555a", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },

	{ "max7310", 8  | PCA953X_TYPE, },
	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7315", 8  | PCA953X_TYPE | PCA_INT, },
	{ "max7318", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
	{ "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
	{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
	{ "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
	{ "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
	{ "tca9554", 8  | PCA953X_TYPE | PCA_INT, },
	{ "xra1202", 8  | PCA953X_TYPE },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pca953x_id);

static const struct acpi_device_id pca953x_acpi_ids[] = {
	{ "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
	{ }
};
MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);

#define MAX_BANK 5
#define BANK_SZ 8

#define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)

struct pca953x_reg_config {
	int direction;
	int output;
	int input;
};

static const struct pca953x_reg_config pca953x_regs = {
	.direction = PCA953X_DIRECTION,
	.output = PCA953X_OUTPUT,
	.input = PCA953X_INPUT,
};

static const struct pca953x_reg_config pca957x_regs = {
	.direction = PCA957X_CFG,
	.output = PCA957X_OUT,
	.input = PCA957X_IN,
};

struct pca953x_chip {
	unsigned gpio_start;
	u8 reg_output[MAX_BANK];
	u8 reg_direction[MAX_BANK];
	struct mutex i2c_lock;

#ifdef CONFIG_GPIO_PCA953X_IRQ
	struct mutex irq_lock;
	u8 irq_mask[MAX_BANK];
	u8 irq_stat[MAX_BANK];
	u8 irq_trig_raise[MAX_BANK];
	u8 irq_trig_fall[MAX_BANK];
#endif

	struct i2c_client *client;
	struct gpio_chip gpio_chip;
	const char *const *names;
	unsigned long driver_data;
	struct regulator *regulator;

	const struct pca953x_reg_config *regs;

	int (*write_regs)(struct pca953x_chip *, int, u8 *);
	int (*read_regs)(struct pca953x_chip *, int, u8 *);
};

static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
				int off)
{
	int ret;
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int offset = off / BANK_SZ;

	ret = i2c_smbus_read_byte_data(chip->client,
				(reg << bank_shift) + offset);
	*val = ret;

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed reading register\n");
		return ret;
	}

	return 0;
}

static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
				int off)
{
	int ret;
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int offset = off / BANK_SZ;

	ret = i2c_smbus_write_byte_data(chip->client,
					(reg << bank_shift) + offset, val);

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed writing register\n");
		return ret;
	}

	return 0;
}

static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
{
	return i2c_smbus_write_byte_data(chip->client, reg, *val);
}

static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
	u16 word = get_unaligned((u16 *)val);

	return i2c_smbus_write_word_data(chip->client, reg << 1, word);
}

static int pca957x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	ret = i2c_smbus_write_byte_data(chip->client, reg << 1, val[0]);
	if (ret < 0)
		return ret;

	return i2c_smbus_write_byte_data(chip->client, (reg << 1) + 1, val[1]);
}

static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
{
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
	int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;

	return i2c_smbus_write_i2c_block_data(chip->client,
					      pinctrl | addr | REG_ADDR_AI,
					      NBANK(chip), val);
}

static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret = 0;

	ret = chip->write_regs(chip, reg, val);
	if (ret < 0) {
		dev_err(&chip->client->dev, "failed writing register\n");
		return ret;
	}

	return 0;
}

static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	ret = i2c_smbus_read_byte_data(chip->client, reg);
	*val = ret;

	return ret;
}

static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	ret = i2c_smbus_read_word_data(chip->client, reg << 1);
	put_unaligned(ret, (u16 *)val);

	return ret;
}

static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
{
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
	int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;

	return i2c_smbus_read_i2c_block_data(chip->client,
					     pinctrl | addr | REG_ADDR_AI,
					     NBANK(chip), val);
}

static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	ret = chip->read_regs(chip, reg, val);
	if (ret < 0) {
		dev_err(&chip->client->dev, "failed reading register\n");
		return ret;
	}

	return 0;
}

static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 reg_val;
	int ret;

	mutex_lock(&chip->i2c_lock);
	reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));

	ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_direction[off / BANK_SZ] = reg_val;
exit:
	mutex_unlock(&chip->i2c_lock);
	return ret;
}

static int pca953x_gpio_direction_output(struct gpio_chip *gc,
		unsigned off, int val)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 reg_val;
	int ret;

	mutex_lock(&chip->i2c_lock);
	/* set output level */
	if (val)
		reg_val = chip->reg_output[off / BANK_SZ]
			| (1u << (off % BANK_SZ));
	else
		reg_val = chip->reg_output[off / BANK_SZ]
			& ~(1u << (off % BANK_SZ));

	ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_output[off / BANK_SZ] = reg_val;

	/* then direction */
	reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
	ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_direction[off / BANK_SZ] = reg_val;
exit:
	mutex_unlock(&chip->i2c_lock);
	return ret;
}

static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u32 reg_val;
	int ret;

	mutex_lock(&chip->i2c_lock);
	ret = pca953x_read_single(chip, chip->regs->input, &reg_val, off);
	mutex_unlock(&chip->i2c_lock);
	if (ret < 0) {
		/* NOTE:  diagnostic already emitted; that's all we should
		 * do unless gpio_*_value_cansleep() calls become different
		 * from their nonsleeping siblings (and report faults).
		 */
		return 0;
	}

	return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
}

static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 reg_val;
	int ret;

	mutex_lock(&chip->i2c_lock);
	if (val)
		reg_val = chip->reg_output[off / BANK_SZ]
			| (1u << (off % BANK_SZ));
	else
		reg_val = chip->reg_output[off / BANK_SZ]
			& ~(1u << (off % BANK_SZ));

	ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_output[off / BANK_SZ] = reg_val;
exit:
	mutex_unlock(&chip->i2c_lock);
}

static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u32 reg_val;
	int ret;

	mutex_lock(&chip->i2c_lock);
	ret = pca953x_read_single(chip, chip->regs->direction, &reg_val, off);
	mutex_unlock(&chip->i2c_lock);
	if (ret < 0)
		return ret;

	return !!(reg_val & (1u << (off % BANK_SZ)));
}

static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
				      unsigned long *mask, unsigned long *bits)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	unsigned int bank_mask, bank_val;
	int bank_shift, bank;
	u8 reg_val[MAX_BANK];
	int ret;

	bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);

	mutex_lock(&chip->i2c_lock);
	memcpy(reg_val, chip->reg_output, NBANK(chip));
	for (bank = 0; bank < NBANK(chip); bank++) {
		bank_mask = mask[bank / sizeof(*mask)] >>
			   ((bank % sizeof(*mask)) * 8);
		if (bank_mask) {
			bank_val = bits[bank / sizeof(*bits)] >>
				  ((bank % sizeof(*bits)) * 8);
			bank_val &= bank_mask;
			reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val;
		}
	}

	ret = i2c_smbus_write_i2c_block_data(chip->client,
					     chip->regs->output << bank_shift,
					     NBANK(chip), reg_val);
	if (ret)
		goto exit;

	memcpy(chip->reg_output, reg_val, NBANK(chip));
exit:
	mutex_unlock(&chip->i2c_lock);
}

static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
{
	struct gpio_chip *gc;

	gc = &chip->gpio_chip;

	gc->direction_input  = pca953x_gpio_direction_input;
	gc->direction_output = pca953x_gpio_direction_output;
	gc->get = pca953x_gpio_get_value;
	gc->set = pca953x_gpio_set_value;
	gc->get_direction = pca953x_gpio_get_direction;
	gc->set_multiple = pca953x_gpio_set_multiple;
	gc->can_sleep = true;

	gc->base = chip->gpio_start;
	gc->ngpio = gpios;
	gc->label = chip->client->name;
	gc->parent = &chip->client->dev;
	gc->owner = THIS_MODULE;
	gc->names = chip->names;
}

#ifdef CONFIG_GPIO_PCA953X_IRQ
static void pca953x_irq_mask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);

	chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
}

static void pca953x_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);

	chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
}

static void pca953x_irq_bus_lock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);

	mutex_lock(&chip->irq_lock);
}

static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 new_irqs;
	int level, i;
	u8 invert_irq_mask[MAX_BANK];

	if (chip->driver_data & PCA_PCAL) {
		/* Enable latch on interrupt-enabled inputs */
		pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);

		for (i = 0; i < NBANK(chip); i++)
			invert_irq_mask[i] = ~chip->irq_mask[i];

		/* Unmask enabled interrupts */
		pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask);
	}

	/* Look for any newly setup interrupt */
	for (i = 0; i < NBANK(chip); i++) {
		new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
		new_irqs &= ~chip->reg_direction[i];

		while (new_irqs) {
			level = __ffs(new_irqs);
			pca953x_gpio_direction_input(&chip->gpio_chip,
							level + (BANK_SZ * i));
			new_irqs &= ~(1 << level);
		}
	}

	mutex_unlock(&chip->irq_lock);
}

static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	int bank_nb = d->hwirq / BANK_SZ;
	u8 mask = 1 << (d->hwirq % BANK_SZ);

	if (!(type & IRQ_TYPE_EDGE_BOTH)) {
		dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
			d->irq, type);
		return -EINVAL;
	}

	if (type & IRQ_TYPE_EDGE_FALLING)
		chip->irq_trig_fall[bank_nb] |= mask;
	else
		chip->irq_trig_fall[bank_nb] &= ~mask;

	if (type & IRQ_TYPE_EDGE_RISING)
		chip->irq_trig_raise[bank_nb] |= mask;
	else
		chip->irq_trig_raise[bank_nb] &= ~mask;

	return 0;
}

static void pca953x_irq_shutdown(struct irq_data *d)
{
	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
	u8 mask = 1 << (d->hwirq % BANK_SZ);

	chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask;
	chip->irq_trig_fall[d->hwirq / BANK_SZ] &= ~mask;
}

static struct irq_chip pca953x_irq_chip = {
	.name			= "pca953x",
	.irq_mask		= pca953x_irq_mask,
	.irq_unmask		= pca953x_irq_unmask,
	.irq_bus_lock		= pca953x_irq_bus_lock,
	.irq_bus_sync_unlock	= pca953x_irq_bus_sync_unlock,
	.irq_set_type		= pca953x_irq_set_type,
	.irq_shutdown		= pca953x_irq_shutdown,
};

static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
{
	u8 cur_stat[MAX_BANK];
	u8 old_stat[MAX_BANK];
	bool pending_seen = false;
	bool trigger_seen = false;
	u8 trigger[MAX_BANK];
	int ret, i;

	if (chip->driver_data & PCA_PCAL) {
		/* Read the current interrupt status from the device */
		ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
		if (ret)
			return false;

		/* Check latched inputs and clear interrupt status */
		ret = pca953x_read_regs(chip, PCA953X_INPUT, cur_stat);
		if (ret)
			return false;

		for (i = 0; i < NBANK(chip); i++) {
			/* Apply filter for rising/falling edge selection */
			pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) |
				(cur_stat[i] & chip->irq_trig_raise[i]);
			pending[i] &= trigger[i];
			if (pending[i])
				pending_seen = true;
		}

		return pending_seen;
	}

	ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
	if (ret)
		return false;

	/* Remove output pins from the equation */
	for (i = 0; i < NBANK(chip); i++)
		cur_stat[i] &= chip->reg_direction[i];

	memcpy(old_stat, chip->irq_stat, NBANK(chip));

	for (i = 0; i < NBANK(chip); i++) {
		trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
		if (trigger[i])
			trigger_seen = true;
	}

	if (!trigger_seen)
		return false;

	memcpy(chip->irq_stat, cur_stat, NBANK(chip));

	for (i = 0; i < NBANK(chip); i++) {
		pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
			(cur_stat[i] & chip->irq_trig_raise[i]);
		pending[i] &= trigger[i];
		if (pending[i])
			pending_seen = true;
	}

	return pending_seen;
}

static irqreturn_t pca953x_irq_handler(int irq, void *devid)
{
	struct pca953x_chip *chip = devid;
	u8 pending[MAX_BANK];
	u8 level;
	unsigned nhandled = 0;
	int i;

	if (!pca953x_irq_pending(chip, pending))
		return IRQ_NONE;

	for (i = 0; i < NBANK(chip); i++) {
		while (pending[i]) {
			level = __ffs(pending[i]);
			handle_nested_irq(irq_find_mapping(chip->gpio_chip.irq.domain,
							level + (BANK_SZ * i)));
			pending[i] &= ~(1 << level);
			nhandled++;
		}
	}

	return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
}

static int pca953x_irq_setup(struct pca953x_chip *chip,
			     int irq_base)
{
	struct i2c_client *client = chip->client;
	int ret, i;

	if (client->irq && irq_base != -1
			&& (chip->driver_data & PCA_INT)) {
		ret = pca953x_read_regs(chip,
					chip->regs->input, chip->irq_stat);
		if (ret)
			return ret;

		/*
		 * There is no way to know which GPIO line generated the
		 * interrupt.  We have to rely on the previous read for
		 * this purpose.
		 */
		for (i = 0; i < NBANK(chip); i++)
			chip->irq_stat[i] &= chip->reg_direction[i];
		mutex_init(&chip->irq_lock);

		ret = devm_request_threaded_irq(&client->dev,
					client->irq,
					   NULL,
					   pca953x_irq_handler,
					   IRQF_TRIGGER_LOW | IRQF_ONESHOT |
						   IRQF_SHARED,
					   dev_name(&client->dev), chip);
		if (ret) {
			dev_err(&client->dev, "failed to request irq %d\n",
				client->irq);
			return ret;
		}

		ret =  gpiochip_irqchip_add_nested(&chip->gpio_chip,
						   &pca953x_irq_chip,
						   irq_base,
						   handle_simple_irq,
						   IRQ_TYPE_NONE);
		if (ret) {
			dev_err(&client->dev,
				"could not connect irqchip to gpiochip\n");
			return ret;
		}

		gpiochip_set_nested_irqchip(&chip->gpio_chip,
					    &pca953x_irq_chip,
					    client->irq);
	}

	return 0;
}

#else /* CONFIG_GPIO_PCA953X_IRQ */
static int pca953x_irq_setup(struct pca953x_chip *chip,
			     int irq_base)
{
	struct i2c_client *client = chip->client;

	if (irq_base != -1 && (chip->driver_data & PCA_INT))
		dev_warn(&client->dev, "interrupt support not compiled in\n");

	return 0;
}
#endif

static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
{
	int ret;
	u8 val[MAX_BANK];

	chip->regs = &pca953x_regs;

	ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
	if (ret)
		goto out;

	ret = pca953x_read_regs(chip, chip->regs->direction,
				chip->reg_direction);
	if (ret)
		goto out;

	/* set platform specific polarity inversion */
	if (invert)
		memset(val, 0xFF, NBANK(chip));
	else
		memset(val, 0, NBANK(chip));

	ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
out:
	return ret;
}

static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
{
	int ret;
	u8 val[MAX_BANK];

	chip->regs = &pca957x_regs;

	ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
	if (ret)
		goto out;
	ret = pca953x_read_regs(chip, chip->regs->direction,
				chip->reg_direction);
	if (ret)
		goto out;

	/* set platform specific polarity inversion */
	if (invert)
		memset(val, 0xFF, NBANK(chip));
	else
		memset(val, 0, NBANK(chip));
	ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
	if (ret)
		goto out;

	/* To enable register 6, 7 to control pull up and pull down */
	memset(val, 0x02, NBANK(chip));
	ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
	if (ret)
		goto out;

	return 0;
out:
	return ret;
}

static const struct of_device_id pca953x_dt_ids[];

static int pca953x_probe(struct i2c_client *client,
				   const struct i2c_device_id *i2c_id)
{
	struct pca953x_platform_data *pdata;
	struct pca953x_chip *chip;
	int irq_base = 0;
	int ret;
	u32 invert = 0;
	struct regulator *reg;

	chip = devm_kzalloc(&client->dev,
			sizeof(struct pca953x_chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;

	pdata = dev_get_platdata(&client->dev);
	if (pdata) {
		irq_base = pdata->irq_base;
		chip->gpio_start = pdata->gpio_base;
		invert = pdata->invert;
		chip->names = pdata->names;
	} else {
		struct gpio_desc *reset_gpio;

		chip->gpio_start = -1;
		irq_base = 0;

		/*
		 * See if we need to de-assert a reset pin.
		 *
		 * There is no known ACPI-enabled platforms that are
		 * using "reset" GPIO. Otherwise any of those platform
		 * must use _DSD method with corresponding property.
		 */
		reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
						     GPIOD_OUT_LOW);
		if (IS_ERR(reset_gpio))
			return PTR_ERR(reset_gpio);
	}

	chip->client = client;

	reg = devm_regulator_get(&client->dev, "vcc");
	if (IS_ERR(reg)) {
		ret = PTR_ERR(reg);
		if (ret != -EPROBE_DEFER)
			dev_err(&client->dev, "reg get err: %d\n", ret);
		return ret;
	}
	ret = regulator_enable(reg);
	if (ret) {
		dev_err(&client->dev, "reg en err: %d\n", ret);
		return ret;
	}
	chip->regulator = reg;

	if (i2c_id) {
		chip->driver_data = i2c_id->driver_data;
	} else {
		const struct acpi_device_id *acpi_id;
		struct device *dev = &client->dev;

		chip->driver_data = (uintptr_t)of_device_get_match_data(dev);
		if (!chip->driver_data) {
			acpi_id = acpi_match_device(pca953x_acpi_ids, dev);
			if (!acpi_id) {
				ret = -ENODEV;
				goto err_exit;
			}

			chip->driver_data = acpi_id->driver_data;
		}
	}

	mutex_init(&chip->i2c_lock);
	/*
	 * In case we have an i2c-mux controlled by a GPIO provided by an
	 * expander using the same driver higher on the device tree, read the
	 * i2c adapter nesting depth and use the retrieved value as lockdep
	 * subclass for chip->i2c_lock.
	 *
	 * REVISIT: This solution is not complete. It protects us from lockdep
	 * false positives when the expander controlling the i2c-mux is on
	 * a different level on the device tree, but not when it's on the same
	 * level on a different branch (in which case the subclass number
	 * would be the same).
	 *
	 * TODO: Once a correct solution is developed, a similar fix should be
	 * applied to all other i2c-controlled GPIO expanders (and potentially
	 * regmap-i2c).
	 */
	lockdep_set_subclass(&chip->i2c_lock,
			     i2c_adapter_depth(client->adapter));

	/* initialize cached registers from their original values.
	 * we can't share this chip with another i2c master.
	 */
	pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);

	if (chip->gpio_chip.ngpio <= 8) {
		chip->write_regs = pca953x_write_regs_8;
		chip->read_regs = pca953x_read_regs_8;
	} else if (chip->gpio_chip.ngpio >= 24) {
		chip->write_regs = pca953x_write_regs_24;
		chip->read_regs = pca953x_read_regs_24;
	} else {
		if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
			chip->write_regs = pca953x_write_regs_16;
		else
			chip->write_regs = pca957x_write_regs_16;
		chip->read_regs = pca953x_read_regs_16;
	}

	if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
		ret = device_pca953x_init(chip, invert);
	else
		ret = device_pca957x_init(chip, invert);
	if (ret)
		goto err_exit;

	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
	if (ret)
		goto err_exit;

	ret = pca953x_irq_setup(chip, irq_base);
	if (ret)
		goto err_exit;

	if (pdata && pdata->setup) {
		ret = pdata->setup(client, chip->gpio_chip.base,
				chip->gpio_chip.ngpio, pdata->context);
		if (ret < 0)
			dev_warn(&client->dev, "setup failed, %d\n", ret);
	}

	i2c_set_clientdata(client, chip);
	return 0;

err_exit:
	regulator_disable(chip->regulator);
	return ret;
}

static int pca953x_remove(struct i2c_client *client)
{
	struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
	struct pca953x_chip *chip = i2c_get_clientdata(client);
	int ret;

	if (pdata && pdata->teardown) {
		ret = pdata->teardown(client, chip->gpio_chip.base,
				chip->gpio_chip.ngpio, pdata->context);
		if (ret < 0)
			dev_err(&client->dev, "%s failed, %d\n",
					"teardown", ret);
	} else {
		ret = 0;
	}

	regulator_disable(chip->regulator);

	return ret;
}

/* convenience to stop overlong match-table lines */
#define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
#define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)

static const struct of_device_id pca953x_dt_ids[] = {
	{ .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
	{ .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
	{ .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
	{ .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
	{ .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
	{ .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
	{ .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },

	{ .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
	{ .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },

	{ .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
	{ .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },

	{ .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
	{ .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },

	{ .compatible = "onnn,pca9654", .data = OF_953X( 8, PCA_INT), },

	{ .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
	{ }
};

MODULE_DEVICE_TABLE(of, pca953x_dt_ids);

static struct i2c_driver pca953x_driver = {
	.driver = {
		.name	= "pca953x",
		.of_match_table = pca953x_dt_ids,
		.acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
	},
	.probe		= pca953x_probe,
	.remove		= pca953x_remove,
	.id_table	= pca953x_id,
};

static int __init pca953x_init(void)
{
	return i2c_add_driver(&pca953x_driver);
}
/* register after i2c postcore initcall and before
 * subsys initcalls that may rely on these GPIOs
 */
subsys_initcall(pca953x_init);

static void __exit pca953x_exit(void)
{
	i2c_del_driver(&pca953x_driver);
}
module_exit(pca953x_exit);

MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
MODULE_LICENSE("GPL");