aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/extcon/extcon-max77843.c
blob: c9fcd6cd41cbda238fedc31bcc676e45d12935be (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
/*
 * extcon-max77843.c - Maxim MAX77843 extcon driver to support
 *			MUIC(Micro USB Interface Controller)
 *
 * Copyright (C) 2015 Samsung Electronics
 * Author: Jaewon Kim <jaewon02.kim@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/extcon-provider.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77843-private.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>

#define DELAY_MS_DEFAULT		15000	/* unit: millisecond */

enum max77843_muic_status {
	MAX77843_MUIC_STATUS1 = 0,
	MAX77843_MUIC_STATUS2,
	MAX77843_MUIC_STATUS3,

	MAX77843_MUIC_STATUS_NUM,
};

struct max77843_muic_info {
	struct device *dev;
	struct max77693_dev *max77843;
	struct extcon_dev *edev;

	struct mutex mutex;
	struct work_struct irq_work;
	struct delayed_work wq_detcable;

	u8 status[MAX77843_MUIC_STATUS_NUM];
	int prev_cable_type;
	int prev_chg_type;
	int prev_gnd_type;

	bool irq_adc;
	bool irq_chg;
};

enum max77843_muic_cable_group {
	MAX77843_CABLE_GROUP_ADC = 0,
	MAX77843_CABLE_GROUP_ADC_GND,
	MAX77843_CABLE_GROUP_CHG,
};

enum max77843_muic_adc_debounce_time {
	MAX77843_DEBOUNCE_TIME_5MS = 0,
	MAX77843_DEBOUNCE_TIME_10MS,
	MAX77843_DEBOUNCE_TIME_25MS,
	MAX77843_DEBOUNCE_TIME_38_62MS,
};

/* Define accessory cable type */
enum max77843_muic_accessory_type {
	MAX77843_MUIC_ADC_GROUND = 0,
	MAX77843_MUIC_ADC_SEND_END_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
	MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
	MAX77843_MUIC_ADC_RESERVED_ACC_1,
	MAX77843_MUIC_ADC_RESERVED_ACC_2,
	MAX77843_MUIC_ADC_RESERVED_ACC_3, /* SmartDock */
	MAX77843_MUIC_ADC_RESERVED_ACC_4,
	MAX77843_MUIC_ADC_RESERVED_ACC_5,
	MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
	MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
	MAX77843_MUIC_ADC_TTY_CONVERTER,
	MAX77843_MUIC_ADC_UART_CABLE,
	MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
	MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
	MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
	MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
	MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
	MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
	MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
	MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
	MAX77843_MUIC_ADC_OPEN,

	/*
	 * The below accessories should check
	 * not only ADC value but also ADC1K and VBVolt value.
	 */
						/* Offset|ADC1K|VBVolt| */
	MAX77843_MUIC_GND_USB_HOST = 0x100,	/*    0x1|    0|     0| */
	MAX77843_MUIC_GND_USB_HOST_VB = 0x101,	/*    0x1|    0|     1| */
	MAX77843_MUIC_GND_MHL = 0x102,		/*    0x1|    1|     0| */
	MAX77843_MUIC_GND_MHL_VB = 0x103,	/*    0x1|    1|     1| */
};

/* Define charger cable type */
enum max77843_muic_charger_type {
	MAX77843_MUIC_CHG_NONE = 0,
	MAX77843_MUIC_CHG_USB,
	MAX77843_MUIC_CHG_DOWNSTREAM,
	MAX77843_MUIC_CHG_DEDICATED,
	MAX77843_MUIC_CHG_SPECIAL_500MA,
	MAX77843_MUIC_CHG_SPECIAL_1A,
	MAX77843_MUIC_CHG_SPECIAL_BIAS,
	MAX77843_MUIC_CHG_RESERVED,
	MAX77843_MUIC_CHG_GND,
	MAX77843_MUIC_CHG_DOCK,
};

static const unsigned int max77843_extcon_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_CHG_USB_SDP,
	EXTCON_CHG_USB_DCP,
	EXTCON_CHG_USB_CDP,
	EXTCON_CHG_USB_FAST,
	EXTCON_CHG_USB_SLOW,
	EXTCON_DISP_MHL,
	EXTCON_DOCK,
	EXTCON_JIG,
	EXTCON_NONE,
};

struct max77843_muic_irq {
	unsigned int irq;
	const char *name;
	unsigned int virq;
};

static struct max77843_muic_irq max77843_muic_irqs[] = {
	{ MAX77843_MUIC_IRQ_INT1_ADC,		"MUIC-ADC" },
	{ MAX77843_MUIC_IRQ_INT1_ADCERROR,	"MUIC-ADC_ERROR" },
	{ MAX77843_MUIC_IRQ_INT1_ADC1K,		"MUIC-ADC1K" },
	{ MAX77843_MUIC_IRQ_INT2_CHGTYP,	"MUIC-CHGTYP" },
	{ MAX77843_MUIC_IRQ_INT2_CHGDETRUN,	"MUIC-CHGDETRUN" },
	{ MAX77843_MUIC_IRQ_INT2_DCDTMR,	"MUIC-DCDTMR" },
	{ MAX77843_MUIC_IRQ_INT2_DXOVP,		"MUIC-DXOVP" },
	{ MAX77843_MUIC_IRQ_INT2_VBVOLT,	"MUIC-VBVOLT" },
	{ MAX77843_MUIC_IRQ_INT3_VBADC,		"MUIC-VBADC" },
	{ MAX77843_MUIC_IRQ_INT3_VDNMON,	"MUIC-VDNMON" },
	{ MAX77843_MUIC_IRQ_INT3_DNRES,		"MUIC-DNRES" },
	{ MAX77843_MUIC_IRQ_INT3_MPNACK,	"MUIC-MPNACK"},
	{ MAX77843_MUIC_IRQ_INT3_MRXBUFOW,	"MUIC-MRXBUFOW"},
	{ MAX77843_MUIC_IRQ_INT3_MRXTRF,	"MUIC-MRXTRF"},
	{ MAX77843_MUIC_IRQ_INT3_MRXPERR,	"MUIC-MRXPERR"},
	{ MAX77843_MUIC_IRQ_INT3_MRXRDY,	"MUIC-MRXRDY"},
};

static const struct regmap_config max77843_muic_regmap_config = {
	.reg_bits       = 8,
	.val_bits       = 8,
	.max_register   = MAX77843_MUIC_REG_END,
};

static const struct regmap_irq max77843_muic_irq[] = {
	/* INT1 interrupt */
	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },

	/* INT2 interrupt */
	{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
	{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
	{ .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
	{ .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
	{ .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },

	/* INT3 interrupt */
	{ .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
	{ .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
	{ .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
	{ .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
};

static const struct regmap_irq_chip max77843_muic_irq_chip = {
	.name           = "max77843-muic",
	.status_base    = MAX77843_MUIC_REG_INT1,
	.mask_base      = MAX77843_MUIC_REG_INTMASK1,
	.mask_invert    = true,
	.num_regs       = 3,
	.irqs           = max77843_muic_irq,
	.num_irqs       = ARRAY_SIZE(max77843_muic_irq),
};

static int max77843_muic_set_path(struct max77843_muic_info *info,
		u8 val, bool attached, bool nobccomp)
{
	struct max77693_dev *max77843 = info->max77843;
	int ret = 0;
	unsigned int ctrl1, ctrl2;

	if (attached)
		ctrl1 = val;
	else
		ctrl1 = MAX77843_MUIC_CONTROL1_SW_OPEN;
	if (nobccomp) {
		/* Disable BC1.2 protocol and force manual switch control */
		ctrl1 |= MAX77843_MUIC_CONTROL1_NOBCCOMP_MASK;
	}

	ret = regmap_update_bits(max77843->regmap_muic,
			MAX77843_MUIC_REG_CONTROL1,
			MAX77843_MUIC_CONTROL1_COM_SW |
				MAX77843_MUIC_CONTROL1_NOBCCOMP_MASK,
			ctrl1);
	if (ret < 0) {
		dev_err(info->dev, "Cannot switch MUIC port\n");
		return ret;
	}

	if (attached)
		ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
	else
		ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;

	ret = regmap_update_bits(max77843->regmap_muic,
			MAX77843_MUIC_REG_CONTROL2,
			MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
			MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
	if (ret < 0) {
		dev_err(info->dev, "Cannot update lowpower mode\n");
		return ret;
	}

	dev_dbg(info->dev,
		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
		ctrl1, ctrl2, attached ? "attached" : "detached");

	return 0;
}

static void max77843_charger_set_otg_vbus(struct max77843_muic_info *info,
		 bool on)
{
	struct max77693_dev *max77843 = info->max77843;
	unsigned int cnfg00;

	if (on)
		cnfg00 = MAX77843_CHG_OTG_MASK | MAX77843_CHG_BOOST_MASK;
	else
		cnfg00 = MAX77843_CHG_ENABLE | MAX77843_CHG_BUCK_MASK;

	regmap_update_bits(max77843->regmap_chg, MAX77843_CHG_REG_CHG_CNFG_00,
			   MAX77843_CHG_MODE_MASK, cnfg00);
}

static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
		enum max77843_muic_cable_group group, bool *attached)
{
	int adc, chg_type, cable_type, gnd_type;

	adc = info->status[MAX77843_MUIC_STATUS1] &
			MAX77843_MUIC_STATUS1_ADC_MASK;
	adc >>= MAX77843_MUIC_STATUS1_ADC_SHIFT;

	switch (group) {
	case MAX77843_CABLE_GROUP_ADC:
		if (adc == MAX77843_MUIC_ADC_OPEN) {
			*attached = false;
			cable_type = info->prev_cable_type;
			info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
		} else {
			*attached = true;
			cable_type = info->prev_cable_type = adc;
		}
		break;
	case MAX77843_CABLE_GROUP_CHG:
		chg_type = info->status[MAX77843_MUIC_STATUS2] &
				MAX77843_MUIC_STATUS2_CHGTYP_MASK;

		/* Check GROUND accessory with charger cable */
		if (adc == MAX77843_MUIC_ADC_GROUND) {
			if (chg_type == MAX77843_MUIC_CHG_NONE) {
				/*
				 * The following state when charger cable is
				 * disconnected but the GROUND accessory still
				 * connected.
				 */
				*attached = false;
				cable_type = info->prev_chg_type;
				info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
			} else {

				/*
				 * The following state when charger cable is
				 * connected on the GROUND accessory.
				 */
				*attached = true;
				cable_type = MAX77843_MUIC_CHG_GND;
				info->prev_chg_type = MAX77843_MUIC_CHG_GND;
			}
			break;
		}

		if (adc == MAX77843_MUIC_ADC_RESERVED_ACC_3) { /* SmartDock */
			if (chg_type == MAX77843_MUIC_CHG_NONE) {
				*attached = false;
				cable_type = info->prev_chg_type;
				info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
			} else {
				*attached = true;
				cable_type = MAX77843_MUIC_CHG_DOCK;
				info->prev_chg_type = MAX77843_MUIC_CHG_DOCK;
			}
			break;
		}

		if (chg_type == MAX77843_MUIC_CHG_NONE) {
			*attached = false;
			cable_type = info->prev_chg_type;
			info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
		} else {
			*attached = true;
			cable_type = info->prev_chg_type = chg_type;
		}
		break;
	case MAX77843_CABLE_GROUP_ADC_GND:
		if (adc == MAX77843_MUIC_ADC_OPEN) {
			*attached = false;
			cable_type = info->prev_gnd_type;
			info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
		} else {
			*attached = true;

			/*
			 * Offset|ADC1K|VBVolt|
			 *    0x1|    0|     0| USB-HOST
			 *    0x1|    0|     1| USB-HOST with VB
			 *    0x1|    1|     0| MHL
			 *    0x1|    1|     1| MHL with VB
			 */
			/* Get ADC1K register bit */
			gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
					MAX77843_MUIC_STATUS1_ADC1K_MASK);

			/* Get VBVolt register bit */
			gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
					MAX77843_MUIC_STATUS2_VBVOLT_MASK);
			gnd_type >>= MAX77843_MUIC_STATUS2_VBVOLT_SHIFT;

			/* Offset of GND cable */
			gnd_type |= MAX77843_MUIC_GND_USB_HOST;
			cable_type = info->prev_gnd_type = gnd_type;
		}
		break;
	default:
		dev_err(info->dev, "Unknown cable group (%d)\n", group);
		cable_type = -EINVAL;
		break;
	}

	return cable_type;
}

static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
{
	int ret, gnd_cable_type;
	bool attached;

	gnd_cable_type = max77843_muic_get_cable_type(info,
			MAX77843_CABLE_GROUP_ADC_GND, &attached);
	dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
			attached ? "attached" : "detached", gnd_cable_type);

	switch (gnd_cable_type) {
	case MAX77843_MUIC_GND_USB_HOST:
	case MAX77843_MUIC_GND_USB_HOST_VB:
		ret = max77843_muic_set_path(info,
					     MAX77843_MUIC_CONTROL1_SW_USB,
					     attached, false);
		if (ret < 0)
			return ret;

		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
		max77843_charger_set_otg_vbus(info, attached);
		break;
	case MAX77843_MUIC_GND_MHL_VB:
	case MAX77843_MUIC_GND_MHL:
		ret = max77843_muic_set_path(info,
					     MAX77843_MUIC_CONTROL1_SW_OPEN,
					     attached, false);
		if (ret < 0)
			return ret;

		extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
		break;
	default:
		dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
			attached ? "attached" : "detached", gnd_cable_type);
		return -EINVAL;
	}

	return 0;
}

static int max77843_muic_jig_handler(struct max77843_muic_info *info,
		int cable_type, bool attached)
{
	int ret;
	u8 path = MAX77843_MUIC_CONTROL1_SW_OPEN;

	dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
			attached ? "attached" : "detached", cable_type);

	switch (cable_type) {
	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
		path = MAX77843_MUIC_CONTROL1_SW_USB;
		break;
	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
		path = MAX77843_MUIC_CONTROL1_SW_UART;
		break;
	default:
		return -EINVAL;
	}

	ret = max77843_muic_set_path(info, path, attached, false);
	if (ret < 0)
		return ret;

	extcon_set_state_sync(info->edev, EXTCON_JIG, attached);

	return 0;
}

static int max77843_muic_dock_handler(struct max77843_muic_info *info,
		bool attached)
{
	int ret;

	dev_dbg(info->dev, "external connector is %s (adc: 0x10)\n",
			attached ? "attached" : "detached");

	ret = max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_USB,
				     attached, attached);
	if (ret < 0)
		return ret;

	extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
	extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
	extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);

	return 0;
}

static int max77843_muic_adc_handler(struct max77843_muic_info *info)
{
	int ret, cable_type;
	bool attached;

	cable_type = max77843_muic_get_cable_type(info,
			MAX77843_CABLE_GROUP_ADC, &attached);

	dev_dbg(info->dev,
		"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
		attached ? "attached" : "detached", cable_type,
		info->prev_cable_type);

	switch (cable_type) {
	case MAX77843_MUIC_ADC_RESERVED_ACC_3: /* SmartDock */
		ret = max77843_muic_dock_handler(info, attached);
		if (ret < 0)
			return ret;
		break;
	case MAX77843_MUIC_ADC_GROUND:
		ret = max77843_muic_adc_gnd_handler(info);
		if (ret < 0)
			return ret;
		break;
	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
		ret = max77843_muic_jig_handler(info, cable_type, attached);
		if (ret < 0)
			return ret;
		break;
	case MAX77843_MUIC_ADC_SEND_END_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
	case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
	case MAX77843_MUIC_ADC_RESERVED_ACC_1:
	case MAX77843_MUIC_ADC_RESERVED_ACC_2:
	case MAX77843_MUIC_ADC_RESERVED_ACC_4:
	case MAX77843_MUIC_ADC_RESERVED_ACC_5:
	case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
	case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
	case MAX77843_MUIC_ADC_TTY_CONVERTER:
	case MAX77843_MUIC_ADC_UART_CABLE:
	case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
	case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
	case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
	case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
	case MAX77843_MUIC_ADC_OPEN:
		dev_err(info->dev,
			"accessory is %s but it isn't used (adc:0x%x)\n",
			attached ? "attached" : "detached", cable_type);
		return -EAGAIN;
	default:
		dev_err(info->dev,
			"failed to detect %s accessory (adc:0x%x)\n",
			attached ? "attached" : "detached", cable_type);
		return -EINVAL;
	}

	return 0;
}

static int max77843_muic_chg_handler(struct max77843_muic_info *info)
{
	int ret, chg_type, gnd_type;
	bool attached;

	chg_type = max77843_muic_get_cable_type(info,
			MAX77843_CABLE_GROUP_CHG, &attached);

	dev_dbg(info->dev,
		"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
		attached ? "attached" : "detached",
		chg_type, info->prev_chg_type);

	switch (chg_type) {
	case MAX77843_MUIC_CHG_USB:
		ret = max77843_muic_set_path(info,
					     MAX77843_MUIC_CONTROL1_SW_USB,
					     attached, false);
		if (ret < 0)
			return ret;

		extcon_set_state_sync(info->edev, EXTCON_USB, attached);
		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
					attached);
		break;
	case MAX77843_MUIC_CHG_DOWNSTREAM:
		ret = max77843_muic_set_path(info,
					     MAX77843_MUIC_CONTROL1_SW_OPEN,
					     attached, false);
		if (ret < 0)
			return ret;

		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
					attached);
		break;
	case MAX77843_MUIC_CHG_DEDICATED:
		ret = max77843_muic_set_path(info,
					     MAX77843_MUIC_CONTROL1_SW_OPEN,
					     attached, false);
		if (ret < 0)
			return ret;

		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
					attached);
		break;
	case MAX77843_MUIC_CHG_SPECIAL_500MA:
		ret = max77843_muic_set_path(info,
					     MAX77843_MUIC_CONTROL1_SW_OPEN,
					     attached, false);
		if (ret < 0)
			return ret;

		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
					attached);
		break;
	case MAX77843_MUIC_CHG_SPECIAL_1A:
		ret = max77843_muic_set_path(info,
					     MAX77843_MUIC_CONTROL1_SW_OPEN,
					     attached, false);
		if (ret < 0)
			return ret;

		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
					attached);
		break;
	case MAX77843_MUIC_CHG_GND:
		gnd_type = max77843_muic_get_cable_type(info,
				MAX77843_CABLE_GROUP_ADC_GND, &attached);

		/* Charger cable on MHL accessory is attach or detach */
		if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
			extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
						true);
		else if (gnd_type == MAX77843_MUIC_GND_MHL)
			extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
						false);
		break;
	case MAX77843_MUIC_CHG_DOCK:
		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP, attached);
		break;
	case MAX77843_MUIC_CHG_NONE:
		break;
	default:
		dev_err(info->dev,
			"failed to detect %s accessory (chg_type:0x%x)\n",
			attached ? "attached" : "detached", chg_type);

		max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_OPEN,
				       attached, false);
		return -EINVAL;
	}

	return 0;
}

static void max77843_muic_irq_work(struct work_struct *work)
{
	struct max77843_muic_info *info = container_of(work,
			struct max77843_muic_info, irq_work);
	struct max77693_dev *max77843 = info->max77843;
	int ret = 0;

	mutex_lock(&info->mutex);

	ret = regmap_bulk_read(max77843->regmap_muic,
			MAX77843_MUIC_REG_STATUS1, info->status,
			MAX77843_MUIC_STATUS_NUM);
	if (ret) {
		dev_err(info->dev, "Cannot read STATUS registers\n");
		mutex_unlock(&info->mutex);
		return;
	}

	if (info->irq_adc) {
		ret = max77843_muic_adc_handler(info);
		if (ret)
			dev_err(info->dev, "Unknown cable type\n");
		info->irq_adc = false;
	}

	if (info->irq_chg) {
		ret = max77843_muic_chg_handler(info);
		if (ret)
			dev_err(info->dev, "Unknown charger type\n");
		info->irq_chg = false;
	}

	mutex_unlock(&info->mutex);
}

static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
{
	struct max77843_muic_info *info = data;
	int i, irq_type = -1;

	for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
		if (irq == max77843_muic_irqs[i].virq)
			irq_type = max77843_muic_irqs[i].irq;

	switch (irq_type) {
	case MAX77843_MUIC_IRQ_INT1_ADC:
	case MAX77843_MUIC_IRQ_INT1_ADCERROR:
	case MAX77843_MUIC_IRQ_INT1_ADC1K:
		info->irq_adc = true;
		break;
	case MAX77843_MUIC_IRQ_INT2_CHGTYP:
	case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
	case MAX77843_MUIC_IRQ_INT2_DCDTMR:
	case MAX77843_MUIC_IRQ_INT2_DXOVP:
	case MAX77843_MUIC_IRQ_INT2_VBVOLT:
		info->irq_chg = true;
		break;
	case MAX77843_MUIC_IRQ_INT3_VBADC:
	case MAX77843_MUIC_IRQ_INT3_VDNMON:
	case MAX77843_MUIC_IRQ_INT3_DNRES:
	case MAX77843_MUIC_IRQ_INT3_MPNACK:
	case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
	case MAX77843_MUIC_IRQ_INT3_MRXTRF:
	case MAX77843_MUIC_IRQ_INT3_MRXPERR:
	case MAX77843_MUIC_IRQ_INT3_MRXRDY:
		break;
	default:
		dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
		break;
	}

	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
}

static void max77843_muic_detect_cable_wq(struct work_struct *work)
{
	struct max77843_muic_info *info = container_of(to_delayed_work(work),
			struct max77843_muic_info, wq_detcable);
	struct max77693_dev *max77843 = info->max77843;
	int chg_type, adc, ret;
	bool attached;

	mutex_lock(&info->mutex);

	ret = regmap_bulk_read(max77843->regmap_muic,
			MAX77843_MUIC_REG_STATUS1, info->status,
			MAX77843_MUIC_STATUS_NUM);
	if (ret) {
		dev_err(info->dev, "Cannot read STATUS registers\n");
		goto err_cable_wq;
	}

	adc = max77843_muic_get_cable_type(info,
			MAX77843_CABLE_GROUP_ADC, &attached);
	if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
		ret = max77843_muic_adc_handler(info);
		if (ret < 0) {
			dev_err(info->dev, "Cannot detect accessory\n");
			goto err_cable_wq;
		}
	}

	chg_type = max77843_muic_get_cable_type(info,
			MAX77843_CABLE_GROUP_CHG, &attached);
	if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
		ret = max77843_muic_chg_handler(info);
		if (ret < 0) {
			dev_err(info->dev, "Cannot detect charger accessory\n");
			goto err_cable_wq;
		}
	}

err_cable_wq:
	mutex_unlock(&info->mutex);
}

static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
		enum max77843_muic_adc_debounce_time time)
{
	struct max77693_dev *max77843 = info->max77843;
	int ret;

	switch (time) {
	case MAX77843_DEBOUNCE_TIME_5MS:
	case MAX77843_DEBOUNCE_TIME_10MS:
	case MAX77843_DEBOUNCE_TIME_25MS:
	case MAX77843_DEBOUNCE_TIME_38_62MS:
		ret = regmap_update_bits(max77843->regmap_muic,
				MAX77843_MUIC_REG_CONTROL4,
				MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
				time << MAX77843_MUIC_CONTROL4_ADCDBSET_SHIFT);
		if (ret < 0) {
			dev_err(info->dev, "Cannot write MUIC regmap\n");
			return ret;
		}
		break;
	default:
		dev_err(info->dev, "Invalid ADC debounce time\n");
		return -EINVAL;
	}

	return 0;
}

static int max77843_init_muic_regmap(struct max77693_dev *max77843)
{
	int ret;

	max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
			I2C_ADDR_MUIC);
	if (!max77843->i2c_muic) {
		dev_err(&max77843->i2c->dev,
				"Cannot allocate I2C device for MUIC\n");
		return -ENOMEM;
	}

	i2c_set_clientdata(max77843->i2c_muic, max77843);

	max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
			&max77843_muic_regmap_config);
	if (IS_ERR(max77843->regmap_muic)) {
		ret = PTR_ERR(max77843->regmap_muic);
		goto err_muic_i2c;
	}

	ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
			0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
	if (ret < 0) {
		dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
		goto err_muic_i2c;
	}

	return 0;

err_muic_i2c:
	i2c_unregister_device(max77843->i2c_muic);

	return ret;
}

static int max77843_muic_probe(struct platform_device *pdev)
{
	struct max77693_dev *max77843 = dev_get_drvdata(pdev->dev.parent);
	struct max77843_muic_info *info;
	unsigned int id;
	int i, ret;

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

	info->dev = &pdev->dev;
	info->max77843 = max77843;

	platform_set_drvdata(pdev, info);
	mutex_init(&info->mutex);

	/* Initialize i2c and regmap */
	ret = max77843_init_muic_regmap(max77843);
	if (ret) {
		dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
		return ret;
	}

	/* Turn off auto detection configuration */
	ret = regmap_update_bits(max77843->regmap_muic,
			MAX77843_MUIC_REG_CONTROL4,
			MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
			MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
			CONTROL4_AUTO_DISABLE);

	/* Initialize extcon device */
	info->edev = devm_extcon_dev_allocate(&pdev->dev,
			max77843_extcon_cable);
	if (IS_ERR(info->edev)) {
		dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
		ret = -ENODEV;
		goto err_muic_irq;
	}

	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
	if (ret) {
		dev_err(&pdev->dev, "Failed to register extcon device\n");
		goto err_muic_irq;
	}

	/* Set ADC debounce time */
	max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);

	/* Set initial path for UART */
	max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_UART, true,
			       false);

	/* Check revision number of MUIC device */
	ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to read revision number\n");
		goto err_muic_irq;
	}
	dev_info(info->dev, "MUIC device ID : 0x%x\n", id);

	/* Support virtual irq domain for max77843 MUIC device */
	INIT_WORK(&info->irq_work, max77843_muic_irq_work);

	/* Clear IRQ bits before request IRQs */
	ret = regmap_bulk_read(max77843->regmap_muic,
			MAX77843_MUIC_REG_INT1, info->status,
			MAX77843_MUIC_STATUS_NUM);
	if (ret) {
		dev_err(&pdev->dev, "Failed to Clear IRQ bits\n");
		goto err_muic_irq;
	}

	for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
		struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
		int virq = 0;

		virq = regmap_irq_get_virq(max77843->irq_data_muic,
				muic_irq->irq);
		if (virq <= 0) {
			ret = -EINVAL;
			goto err_muic_irq;
		}
		muic_irq->virq = virq;

		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
				max77843_muic_irq_handler, IRQF_NO_SUSPEND,
				muic_irq->name, info);
		if (ret) {
			dev_err(&pdev->dev,
				"Failed to request irq (IRQ: %d, error: %d)\n",
				muic_irq->irq, ret);
			goto err_muic_irq;
		}
	}

	/* Detect accessory after completing the initialization of platform */
	INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
	queue_delayed_work(system_power_efficient_wq,
			&info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));

	return 0;

err_muic_irq:
	regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
	i2c_unregister_device(max77843->i2c_muic);

	return ret;
}

static int max77843_muic_remove(struct platform_device *pdev)
{
	struct max77843_muic_info *info = platform_get_drvdata(pdev);
	struct max77693_dev *max77843 = info->max77843;

	cancel_work_sync(&info->irq_work);
	regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
	i2c_unregister_device(max77843->i2c_muic);

	return 0;
}

static const struct platform_device_id max77843_muic_id[] = {
	{ "max77843-muic", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(platform, max77843_muic_id);

static struct platform_driver max77843_muic_driver = {
	.driver		= {
		.name		= "max77843-muic",
	},
	.probe		= max77843_muic_probe,
	.remove		= max77843_muic_remove,
	.id_table	= max77843_muic_id,
};

static int __init max77843_muic_init(void)
{
	return platform_driver_register(&max77843_muic_driver);
}
subsys_initcall(max77843_muic_init);

MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
MODULE_LICENSE("GPL");

Privacy Policy