summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/stmpe.c
blob: b11487f1e1cb68de4dcabcf3ba584426988eda18 (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
/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License, version 2
 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/stmpe.h>
#include "stmpe.h"

static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
{
	return stmpe->variant->enable(stmpe, blocks, true);
}

static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
{
	return stmpe->variant->enable(stmpe, blocks, false);
}

static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
{
	int ret;

	ret = i2c_smbus_read_byte_data(stmpe->i2c, reg);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to read reg %#x: %d\n",
			reg, ret);

	dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);

	return ret;
}

static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
{
	int ret;

	dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);

	ret = i2c_smbus_write_byte_data(stmpe->i2c, reg, val);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to write reg %#x: %d\n",
			reg, ret);

	return ret;
}

static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
{
	int ret;

	ret = __stmpe_reg_read(stmpe, reg);
	if (ret < 0)
		return ret;

	ret &= ~mask;
	ret |= val;

	return __stmpe_reg_write(stmpe, reg, ret);
}

static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
			      u8 *values)
{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(stmpe->i2c, reg, length, values);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to read regs %#x: %d\n",
			reg, ret);

	dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
	stmpe_dump_bytes("stmpe rd: ", values, length);

	return ret;
}

static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
			const u8 *values)
{
	int ret;

	dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
	stmpe_dump_bytes("stmpe wr: ", values, length);

	ret = i2c_smbus_write_i2c_block_data(stmpe->i2c, reg, length,
					     values);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to write regs %#x: %d\n",
			reg, ret);

	return ret;
}

/**
 * stmpe_enable - enable blocks on an STMPE device
 * @stmpe:	Device to work on
 * @blocks:	Mask of blocks (enum stmpe_block values) to enable
 */
int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_enable(stmpe, blocks);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_enable);

/**
 * stmpe_disable - disable blocks on an STMPE device
 * @stmpe:	Device to work on
 * @blocks:	Mask of blocks (enum stmpe_block values) to enable
 */
int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_disable(stmpe, blocks);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_disable);

/**
 * stmpe_reg_read() - read a single STMPE register
 * @stmpe:	Device to read from
 * @reg:	Register to read
 */
int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_reg_read(stmpe, reg);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_reg_read);

/**
 * stmpe_reg_write() - write a single STMPE register
 * @stmpe:	Device to write to
 * @reg:	Register to write
 * @val:	Value to write
 */
int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_reg_write(stmpe, reg, val);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_reg_write);

/**
 * stmpe_set_bits() - set the value of a bitfield in a STMPE register
 * @stmpe:	Device to write to
 * @reg:	Register to write
 * @mask:	Mask of bits to set
 * @val:	Value to set
 */
int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_set_bits(stmpe, reg, mask, val);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_set_bits);

/**
 * stmpe_block_read() - read multiple STMPE registers
 * @stmpe:	Device to read from
 * @reg:	First register
 * @length:	Number of registers
 * @values:	Buffer to write to
 */
int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_block_read(stmpe, reg, length, values);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_block_read);

/**
 * stmpe_block_write() - write multiple STMPE registers
 * @stmpe:	Device to write to
 * @reg:	First register
 * @length:	Number of registers
 * @values:	Values to write
 */
int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
		      const u8 *values)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_block_write(stmpe, reg, length, values);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_block_write);

/**
 * stmpe_set_altfunc: set the alternate function for STMPE pins
 * @stmpe:	Device to configure
 * @pins:	Bitmask of pins to affect
 * @block:	block to enable alternate functions for
 *
 * @pins is assumed to have a bit set for each of the bits whose alternate
 * function is to be changed, numbered according to the GPIOXY numbers.
 *
 * If the GPIO module is not enabled, this function automatically enables it in
 * order to perform the change.
 */
int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
{
	struct stmpe_variant_info *variant = stmpe->variant;
	u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
	int af_bits = variant->af_bits;
	int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
	int afperreg = 8 / af_bits;
	int mask = (1 << af_bits) - 1;
	u8 regs[numregs];
	int af;
	int ret;

	mutex_lock(&stmpe->lock);

	ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
	if (ret < 0)
		goto out;

	ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
	if (ret < 0)
		goto out;

	af = variant->get_altfunc(stmpe, block);

	while (pins) {
		int pin = __ffs(pins);
		int regoffset = numregs - (pin / afperreg) - 1;
		int pos = (pin % afperreg) * (8 / afperreg);

		regs[regoffset] &= ~(mask << pos);
		regs[regoffset] |= af << pos;

		pins &= ~(1 << pin);
	}

	ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);

out:
	mutex_unlock(&stmpe->lock);
	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_set_altfunc);

/*
 * GPIO (all variants)
 */

static struct resource stmpe_gpio_resources[] = {
	/* Start and end filled dynamically */
	{
		.flags	= IORESOURCE_IRQ,
	},
};

static struct mfd_cell stmpe_gpio_cell = {
	.name		= "stmpe-gpio",
	.resources	= stmpe_gpio_resources,
	.num_resources	= ARRAY_SIZE(stmpe_gpio_resources),
};

/*
 * Keypad (1601, 2401, 2403)
 */

static struct resource stmpe_keypad_resources[] = {
	{
		.name	= "KEYPAD",
		.start	= 0,
		.end	= 0,
		.flags	= IORESOURCE_IRQ,
	},
	{
		.name	= "KEYPAD_OVER",
		.start	= 1,
		.end	= 1,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct mfd_cell stmpe_keypad_cell = {
	.name		= "stmpe-keypad",
	.resources	= stmpe_keypad_resources,
	.num_resources	= ARRAY_SIZE(stmpe_keypad_resources),
};

/*
 * Touchscreen (STMPE811)
 */

static struct resource stmpe_ts_resources[] = {
	{
		.name	= "TOUCH_DET",
		.start	= 0,
		.end	= 0,
		.flags	= IORESOURCE_IRQ,
	},
	{
		.name	= "FIFO_TH",
		.start	= 1,
		.end	= 1,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct mfd_cell stmpe_ts_cell = {
	.name		= "stmpe-ts",
	.resources	= stmpe_ts_resources,
	.num_resources	= ARRAY_SIZE(stmpe_ts_resources),
};

/*
 * STMPE811
 */

static const u8 stmpe811_regs[] = {
	[STMPE_IDX_CHIP_ID]	= STMPE811_REG_CHIP_ID,
	[STMPE_IDX_ICR_LSB]	= STMPE811_REG_INT_CTRL,
	[STMPE_IDX_IER_LSB]	= STMPE811_REG_INT_EN,
	[STMPE_IDX_ISR_MSB]	= STMPE811_REG_INT_STA,
	[STMPE_IDX_GPMR_LSB]	= STMPE811_REG_GPIO_MP_STA,
	[STMPE_IDX_GPSR_LSB]	= STMPE811_REG_GPIO_SET_PIN,
	[STMPE_IDX_GPCR_LSB]	= STMPE811_REG_GPIO_CLR_PIN,
	[STMPE_IDX_GPDR_LSB]	= STMPE811_REG_GPIO_DIR,
	[STMPE_IDX_GPRER_LSB]	= STMPE811_REG_GPIO_RE,
	[STMPE_IDX_GPFER_LSB]	= STMPE811_REG_GPIO_FE,
	[STMPE_IDX_GPAFR_U_MSB]	= STMPE811_REG_GPIO_AF,
	[STMPE_IDX_IEGPIOR_LSB]	= STMPE811_REG_GPIO_INT_EN,
	[STMPE_IDX_ISGPIOR_MSB]	= STMPE811_REG_GPIO_INT_STA,
	[STMPE_IDX_GPEDR_MSB]	= STMPE811_REG_GPIO_ED,
};

static struct stmpe_variant_block stmpe811_blocks[] = {
	{
		.cell	= &stmpe_gpio_cell,
		.irq	= STMPE811_IRQ_GPIOC,
		.block	= STMPE_BLOCK_GPIO,
	},
	{
		.cell	= &stmpe_ts_cell,
		.irq	= STMPE811_IRQ_TOUCH_DET,
		.block	= STMPE_BLOCK_TOUCHSCREEN,
	},
};

static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
			   bool enable)
{
	unsigned int mask = 0;

	if (blocks & STMPE_BLOCK_GPIO)
		mask |= STMPE811_SYS_CTRL2_GPIO_OFF;

	if (blocks & STMPE_BLOCK_ADC)
		mask |= STMPE811_SYS_CTRL2_ADC_OFF;

	if (blocks & STMPE_BLOCK_TOUCHSCREEN)
		mask |= STMPE811_SYS_CTRL2_TSC_OFF;

	return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
				enable ? 0 : mask);
}

static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
{
	/* 0 for touchscreen, 1 for GPIO */
	return block != STMPE_BLOCK_TOUCHSCREEN;
}

static struct stmpe_variant_info stmpe811 = {
	.name		= "stmpe811",
	.id_val		= 0x0811,
	.id_mask	= 0xffff,
	.num_gpios	= 8,
	.af_bits	= 1,
	.regs		= stmpe811_regs,
	.blocks		= stmpe811_blocks,
	.num_blocks	= ARRAY_SIZE(stmpe811_blocks),
	.num_irqs	= STMPE811_NR_INTERNAL_IRQS,
	.enable		= stmpe811_enable,
	.get_altfunc	= stmpe811_get_altfunc,
};

/*
 * STMPE1601
 */

static const u8 stmpe1601_regs[] = {
	[STMPE_IDX_CHIP_ID]	= STMPE1601_REG_CHIP_ID,
	[STMPE_IDX_ICR_LSB]	= STMPE1601_REG_ICR_LSB,
	[STMPE_IDX_IER_LSB]	= STMPE1601_REG_IER_LSB,
	[STMPE_IDX_ISR_MSB]	= STMPE1601_REG_ISR_MSB,
	[STMPE_IDX_GPMR_LSB]	= STMPE1601_REG_GPIO_MP_LSB,
	[STMPE_IDX_GPSR_LSB]	= STMPE1601_REG_GPIO_SET_LSB,
	[STMPE_IDX_GPCR_LSB]	= STMPE1601_REG_GPIO_CLR_LSB,
	[STMPE_IDX_GPDR_LSB]	= STMPE1601_REG_GPIO_SET_DIR_LSB,
	[STMPE_IDX_GPRER_LSB]	= STMPE1601_REG_GPIO_RE_LSB,
	[STMPE_IDX_GPFER_LSB]	= STMPE1601_REG_GPIO_FE_LSB,
	[STMPE_IDX_GPAFR_U_MSB]	= STMPE1601_REG_GPIO_AF_U_MSB,
	[STMPE_IDX_IEGPIOR_LSB]	= STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
	[STMPE_IDX_ISGPIOR_MSB]	= STMPE1601_REG_INT_STA_GPIO_MSB,
	[STMPE_IDX_GPEDR_MSB]	= STMPE1601_REG_GPIO_ED_MSB,
};

static struct stmpe_variant_block stmpe1601_blocks[] = {
	{
		.cell	= &stmpe_gpio_cell,
		.irq	= STMPE24XX_IRQ_GPIOC,
		.block	= STMPE_BLOCK_GPIO,
	},
	{
		.cell	= &stmpe_keypad_cell,
		.irq	= STMPE24XX_IRQ_KEYPAD,
		.block	= STMPE_BLOCK_KEYPAD,
	},
};

/* supported autosleep timeout delay (in msecs) */
static const int stmpe_autosleep_delay[] = {
	4, 16, 32, 64, 128, 256, 512, 1024,
};

static int stmpe_round_timeout(int timeout)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
		if (stmpe_autosleep_delay[i] >= timeout)
			return i;
	}

	/*
	 * requests for delays longer than supported should not return the
	 * longest supported delay
	 */
	return -EINVAL;
}

static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
{
	int ret;

	if (!stmpe->variant->enable_autosleep)
		return -ENOSYS;

	mutex_lock(&stmpe->lock);
	ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
	mutex_unlock(&stmpe->lock);

	return ret;
}

/*
 * Both stmpe 1601/2403 support same layout for autosleep
 */
static int stmpe1601_autosleep(struct stmpe *stmpe,
		int autosleep_timeout)
{
	int ret, timeout;

	/* choose the best available timeout */
	timeout = stmpe_round_timeout(autosleep_timeout);
	if (timeout < 0) {
		dev_err(stmpe->dev, "invalid timeout\n");
		return timeout;
	}

	ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
			STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
			timeout);
	if (ret < 0)
		return ret;

	return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
			STPME1601_AUTOSLEEP_ENABLE,
			STPME1601_AUTOSLEEP_ENABLE);
}

static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
			    bool enable)
{
	unsigned int mask = 0;

	if (blocks & STMPE_BLOCK_GPIO)
		mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;

	if (blocks & STMPE_BLOCK_KEYPAD)
		mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;

	return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
				enable ? mask : 0);
}

static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
{
	switch (block) {
	case STMPE_BLOCK_PWM:
		return 2;

	case STMPE_BLOCK_KEYPAD:
		return 1;

	case STMPE_BLOCK_GPIO:
	default:
		return 0;
	}
}

static struct stmpe_variant_info stmpe1601 = {
	.name		= "stmpe1601",
	.id_val		= 0x0210,
	.id_mask	= 0xfff0,	/* at least 0x0210 and 0x0212 */
	.num_gpios	= 16,
	.af_bits	= 2,
	.regs		= stmpe1601_regs,
	.blocks		= stmpe1601_blocks,
	.num_blocks	= ARRAY_SIZE(stmpe1601_blocks),
	.num_irqs	= STMPE1601_NR_INTERNAL_IRQS,
	.enable		= stmpe1601_enable,
	.get_altfunc	= stmpe1601_get_altfunc,
	.enable_autosleep	= stmpe1601_autosleep,
};

/*
 * STMPE24XX
 */

static const u8 stmpe24xx_regs[] = {
	[STMPE_IDX_CHIP_ID]	= STMPE24XX_REG_CHIP_ID,
	[STMPE_IDX_ICR_LSB]	= STMPE24XX_REG_ICR_LSB,
	[STMPE_IDX_IER_LSB]	= STMPE24XX_REG_IER_LSB,
	[STMPE_IDX_ISR_MSB]	= STMPE24XX_REG_ISR_MSB,
	[STMPE_IDX_GPMR_LSB]	= STMPE24XX_REG_GPMR_LSB,
	[STMPE_IDX_GPSR_LSB]	= STMPE24XX_REG_GPSR_LSB,
	[STMPE_IDX_GPCR_LSB]	= STMPE24XX_REG_GPCR_LSB,
	[STMPE_IDX_GPDR_LSB]	= STMPE24XX_REG_GPDR_LSB,
	[STMPE_IDX_GPRER_LSB]	= STMPE24XX_REG_GPRER_LSB,
	[STMPE_IDX_GPFER_LSB]	= STMPE24XX_REG_GPFER_LSB,
	[STMPE_IDX_GPAFR_U_MSB]	= STMPE24XX_REG_GPAFR_U_MSB,
	[STMPE_IDX_IEGPIOR_LSB]	= STMPE24XX_REG_IEGPIOR_LSB,
	[STMPE_IDX_ISGPIOR_MSB]	= STMPE24XX_REG_ISGPIOR_MSB,
	[STMPE_IDX_GPEDR_MSB]	= STMPE24XX_REG_GPEDR_MSB,
};

static struct stmpe_variant_block stmpe24xx_blocks[] = {
	{
		.cell	= &stmpe_gpio_cell,
		.irq	= STMPE24XX_IRQ_GPIOC,
		.block	= STMPE_BLOCK_GPIO,
	},
	{
		.cell	= &stmpe_keypad_cell,
		.irq	= STMPE24XX_IRQ_KEYPAD,
		.block	= STMPE_BLOCK_KEYPAD,
	},
};

static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
			    bool enable)
{
	unsigned int mask = 0;

	if (blocks & STMPE_BLOCK_GPIO)
		mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;

	if (blocks & STMPE_BLOCK_KEYPAD)
		mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;

	return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
				enable ? mask : 0);
}

static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
{
	switch (block) {
	case STMPE_BLOCK_ROTATOR:
		return 2;

	case STMPE_BLOCK_KEYPAD:
		return 1;

	case STMPE_BLOCK_GPIO:
	default:
		return 0;
	}
}

static struct stmpe_variant_info stmpe2401 = {
	.name		= "stmpe2401",
	.id_val		= 0x0101,
	.id_mask	= 0xffff,
	.num_gpios	= 24,
	.af_bits	= 2,
	.regs		= stmpe24xx_regs,
	.blocks		= stmpe24xx_blocks,
	.num_blocks	= ARRAY_SIZE(stmpe24xx_blocks),
	.num_irqs	= STMPE24XX_NR_INTERNAL_IRQS,
	.enable		= stmpe24xx_enable,
	.get_altfunc	= stmpe24xx_get_altfunc,
};

static struct stmpe_variant_info stmpe2403 = {
	.name		= "stmpe2403",
	.id_val		= 0x0120,
	.id_mask	= 0xffff,
	.num_gpios	= 24,
	.af_bits	= 2,
	.regs		= stmpe24xx_regs,
	.blocks		= stmpe24xx_blocks,
	.num_blocks	= ARRAY_SIZE(stmpe24xx_blocks),
	.num_irqs	= STMPE24XX_NR_INTERNAL_IRQS,
	.enable		= stmpe24xx_enable,
	.get_altfunc	= stmpe24xx_get_altfunc,
	.enable_autosleep	= stmpe1601_autosleep, /* same as stmpe1601 */
};

static struct stmpe_variant_info *stmpe_variant_info[] = {
	[STMPE811]	= &stmpe811,
	[STMPE1601]	= &stmpe1601,
	[STMPE2401]	= &stmpe2401,
	[STMPE2403]	= &stmpe2403,
};

static irqreturn_t stmpe_irq(int irq, void *data)
{
	struct stmpe *stmpe = data;
	struct stmpe_variant_info *variant = stmpe->variant;
	int num = DIV_ROUND_UP(variant->num_irqs, 8);
	u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
	u8 isr[num];
	int ret;
	int i;

	ret = stmpe_block_read(stmpe, israddr, num, isr);
	if (ret < 0)
		return IRQ_NONE;

	for (i = 0; i < num; i++) {
		int bank = num - i - 1;
		u8 status = isr[i];
		u8 clear;

		status &= stmpe->ier[bank];
		if (!status)
			continue;

		clear = status;
		while (status) {
			int bit = __ffs(status);
			int line = bank * 8 + bit;

			handle_nested_irq(stmpe->irq_base + line);
			status &= ~(1 << bit);
		}

		stmpe_reg_write(stmpe, israddr + i, clear);
	}

	return IRQ_HANDLED;
}

static void stmpe_irq_lock(unsigned int irq)
{
	struct stmpe *stmpe = get_irq_chip_data(irq);

	mutex_lock(&stmpe->irq_lock);
}

static void stmpe_irq_sync_unlock(unsigned int irq)
{
	struct stmpe *stmpe = get_irq_chip_data(irq);
	struct stmpe_variant_info *variant = stmpe->variant;
	int num = DIV_ROUND_UP(variant->num_irqs, 8);
	int i;

	for (i = 0; i < num; i++) {
		u8 new = stmpe->ier[i];
		u8 old = stmpe->oldier[i];

		if (new == old)
			continue;

		stmpe->oldier[i] = new;
		stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
	}

	mutex_unlock(&stmpe->irq_lock);
}

static void stmpe_irq_mask(unsigned int irq)
{
	struct stmpe *stmpe = get_irq_chip_data(irq);
	int offset = irq - stmpe->irq_base;
	int regoffset = offset / 8;
	int mask = 1 << (offset % 8);

	stmpe->ier[regoffset] &= ~mask;
}

static void stmpe_irq_unmask(unsigned int irq)
{
	struct stmpe *stmpe = get_irq_chip_data(irq);
	int offset = irq - stmpe->irq_base;
	int regoffset = offset / 8;
	int mask = 1 << (offset % 8);

	stmpe->ier[regoffset] |= mask;
}

static struct irq_chip stmpe_irq_chip = {
	.name			= "stmpe",
	.bus_lock		= stmpe_irq_lock,
	.bus_sync_unlock	= stmpe_irq_sync_unlock,
	.mask			= stmpe_irq_mask,
	.unmask			= stmpe_irq_unmask,
};

static int __devinit stmpe_irq_init(struct stmpe *stmpe)
{
	int num_irqs = stmpe->variant->num_irqs;
	int base = stmpe->irq_base;
	int irq;

	for (irq = base; irq < base + num_irqs; irq++) {
		set_irq_chip_data(irq, stmpe);
		set_irq_chip_and_handler(irq, &stmpe_irq_chip,
					 handle_edge_irq);
		set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
		set_irq_flags(irq, IRQF_VALID);
#else
		set_irq_noprobe(irq);
#endif
	}

	return 0;
}

static void stmpe_irq_remove(struct stmpe *stmpe)
{
	int num_irqs = stmpe->variant->num_irqs;
	int base = stmpe->irq_base;
	int irq;

	for (irq = base; irq < base + num_irqs; irq++) {
#ifdef CONFIG_ARM
		set_irq_flags(irq, 0);
#endif
		set_irq_chip_and_handler(irq, NULL, NULL);
		set_irq_chip_data(irq, NULL);
	}
}

static int __devinit stmpe_chip_init(struct stmpe *stmpe)
{
	unsigned int irq_trigger = stmpe->pdata->irq_trigger;
	int autosleep_timeout = stmpe->pdata->autosleep_timeout;
	struct stmpe_variant_info *variant = stmpe->variant;
	u8 icr = STMPE_ICR_LSB_GIM;
	unsigned int id;
	u8 data[2];
	int ret;

	ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
			       ARRAY_SIZE(data), data);
	if (ret < 0)
		return ret;

	id = (data[0] << 8) | data[1];
	if ((id & variant->id_mask) != variant->id_val) {
		dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
		return -EINVAL;
	}

	dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);

	/* Disable all modules -- subdrivers should enable what they need. */
	ret = stmpe_disable(stmpe, ~0);
	if (ret)
		return ret;

	if (irq_trigger == IRQF_TRIGGER_FALLING ||
	    irq_trigger == IRQF_TRIGGER_RISING)
		icr |= STMPE_ICR_LSB_EDGE;

	if (irq_trigger == IRQF_TRIGGER_RISING ||
	    irq_trigger == IRQF_TRIGGER_HIGH)
		icr |= STMPE_ICR_LSB_HIGH;

	if (stmpe->pdata->irq_invert_polarity)
		icr ^= STMPE_ICR_LSB_HIGH;

	if (stmpe->pdata->autosleep) {
		ret = stmpe_autosleep(stmpe, autosleep_timeout);
		if (ret)
			return ret;
	}

	return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
}

static int __devinit stmpe_add_device(struct stmpe *stmpe,
				      struct mfd_cell *cell, int irq)
{
	return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
			       NULL, stmpe->irq_base + irq);
}

static int __devinit stmpe_devices_init(struct stmpe *stmpe)
{
	struct stmpe_variant_info *variant = stmpe->variant;
	unsigned int platform_blocks = stmpe->pdata->blocks;
	int ret = -EINVAL;
	int i;

	for (i = 0; i < variant->num_blocks; i++) {
		struct stmpe_variant_block *block = &variant->blocks[i];

		if (!(platform_blocks & block->block))
			continue;

		platform_blocks &= ~block->block;
		ret = stmpe_add_device(stmpe, block->cell, block->irq);
		if (ret)
			return ret;
	}

	if (platform_blocks)
		dev_warn(stmpe->dev,
			 "platform wants blocks (%#x) not present on variant",
			 platform_blocks);

	return ret;
}

#ifdef CONFIG_PM
static int stmpe_suspend(struct device *dev)
{
	struct i2c_client *i2c = to_i2c_client(dev);

	if (device_may_wakeup(&i2c->dev))
		enable_irq_wake(i2c->irq);

	return 0;
}

static int stmpe_resume(struct device *dev)
{
	struct i2c_client *i2c = to_i2c_client(dev);

	if (device_may_wakeup(&i2c->dev))
		disable_irq_wake(i2c->irq);

	return 0;
}
#endif

static int __devinit stmpe_probe(struct i2c_client *i2c,
				 const struct i2c_device_id *id)
{
	struct stmpe_platform_data *pdata = i2c->dev.platform_data;
	struct stmpe *stmpe;
	int ret;

	if (!pdata)
		return -EINVAL;

	stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
	if (!stmpe)
		return -ENOMEM;

	mutex_init(&stmpe->irq_lock);
	mutex_init(&stmpe->lock);

	stmpe->dev = &i2c->dev;
	stmpe->i2c = i2c;

	stmpe->pdata = pdata;
	stmpe->irq_base = pdata->irq_base;

	stmpe->partnum = id->driver_data;
	stmpe->variant = stmpe_variant_info[stmpe->partnum];
	stmpe->regs = stmpe->variant->regs;
	stmpe->num_gpios = stmpe->variant->num_gpios;

	i2c_set_clientdata(i2c, stmpe);

	ret = stmpe_chip_init(stmpe);
	if (ret)
		goto out_free;

	ret = stmpe_irq_init(stmpe);
	if (ret)
		goto out_free;

	ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq,
				   pdata->irq_trigger | IRQF_ONESHOT,
				   "stmpe", stmpe);
	if (ret) {
		dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret);
		goto out_removeirq;
	}

	ret = stmpe_devices_init(stmpe);
	if (ret) {
		dev_err(stmpe->dev, "failed to add children\n");
		goto out_removedevs;
	}

	return 0;

out_removedevs:
	mfd_remove_devices(stmpe->dev);
	free_irq(stmpe->i2c->irq, stmpe);
out_removeirq:
	stmpe_irq_remove(stmpe);
out_free:
	kfree(stmpe);
	return ret;
}

static int __devexit stmpe_remove(struct i2c_client *client)
{
	struct stmpe *stmpe = i2c_get_clientdata(client);

	mfd_remove_devices(stmpe->dev);

	free_irq(stmpe->i2c->irq, stmpe);
	stmpe_irq_remove(stmpe);

	kfree(stmpe);

	return 0;
}

static const struct i2c_device_id stmpe_id[] = {
	{ "stmpe811", STMPE811 },
	{ "stmpe1601", STMPE1601 },
	{ "stmpe2401", STMPE2401 },
	{ "stmpe2403", STMPE2403 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, stmpe_id);

#ifdef CONFIG_PM
static const struct dev_pm_ops stmpe_dev_pm_ops = {
	.suspend	= stmpe_suspend,
	.resume		= stmpe_resume,
};
#endif

static struct i2c_driver stmpe_driver = {
	.driver.name	= "stmpe",
	.driver.owner	= THIS_MODULE,
#ifdef CONFIG_PM
	.driver.pm	= &stmpe_dev_pm_ops,
#endif
	.probe		= stmpe_probe,
	.remove		= __devexit_p(stmpe_remove),
	.id_table	= stmpe_id,
};

static int __init stmpe_init(void)
{
	return i2c_add_driver(&stmpe_driver);
}
subsys_initcall(stmpe_init);

static void __exit stmpe_exit(void)
{
	i2c_del_driver(&stmpe_driver);
}
module_exit(stmpe_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("STMPE MFD core driver");
MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
OpenPOWER on IntegriCloud