aboutsummaryrefslogtreecommitdiff
path: root/drivers/extcon/extcon-max77693.c
blob: e21387e2da5c25d2c9fdd19dae94108f9e9455da (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
/*
 * extcon-max77693.c - MAX77693 extcon driver to support MAX77693 MUIC
 *
 * Copyright (C) 2012 Samsung Electrnoics
 * Chanwoo Choi <cw00.choi@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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
#include <linux/extcon.h>
#include <linux/regmap.h>
#include <linux/irqdomain.h>

#define	DEV_NAME			"max77693-muic"

/* MAX77693 MUIC - STATUS1~3 Register */
#define STATUS1_ADC_SHIFT		(0)
#define STATUS1_ADCLOW_SHIFT		(5)
#define STATUS1_ADCERR_SHIFT		(6)
#define STATUS1_ADC1K_SHIFT		(7)
#define STATUS1_ADC_MASK		(0x1f << STATUS1_ADC_SHIFT)
#define STATUS1_ADCLOW_MASK		(0x1 << STATUS1_ADCLOW_SHIFT)
#define STATUS1_ADCERR_MASK		(0x1 << STATUS1_ADCERR_SHIFT)
#define STATUS1_ADC1K_MASK		(0x1 << STATUS1_ADC1K_SHIFT)

#define STATUS2_CHGTYP_SHIFT		(0)
#define STATUS2_CHGDETRUN_SHIFT		(3)
#define STATUS2_DCDTMR_SHIFT		(4)
#define STATUS2_DXOVP_SHIFT		(5)
#define STATUS2_VBVOLT_SHIFT		(6)
#define STATUS2_VIDRM_SHIFT		(7)
#define STATUS2_CHGTYP_MASK		(0x7 << STATUS2_CHGTYP_SHIFT)
#define STATUS2_CHGDETRUN_MASK		(0x1 << STATUS2_CHGDETRUN_SHIFT)
#define STATUS2_DCDTMR_MASK		(0x1 << STATUS2_DCDTMR_SHIFT)
#define STATUS2_DXOVP_MASK		(0x1 << STATUS2_DXOVP_SHIFT)
#define STATUS2_VBVOLT_MASK		(0x1 << STATUS2_VBVOLT_SHIFT)
#define STATUS2_VIDRM_MASK		(0x1 << STATUS2_VIDRM_SHIFT)

#define STATUS3_OVP_SHIFT		(2)
#define STATUS3_OVP_MASK		(0x1 << STATUS3_OVP_SHIFT)

/* MAX77693 CDETCTRL1~2 register */
#define CDETCTRL1_CHGDETEN_SHIFT	(0)
#define CDETCTRL1_CHGTYPMAN_SHIFT	(1)
#define CDETCTRL1_DCDEN_SHIFT		(2)
#define CDETCTRL1_DCD2SCT_SHIFT		(3)
#define CDETCTRL1_CDDELAY_SHIFT		(4)
#define CDETCTRL1_DCDCPL_SHIFT		(5)
#define CDETCTRL1_CDPDET_SHIFT		(7)
#define CDETCTRL1_CHGDETEN_MASK		(0x1 << CDETCTRL1_CHGDETEN_SHIFT)
#define CDETCTRL1_CHGTYPMAN_MASK	(0x1 << CDETCTRL1_CHGTYPMAN_SHIFT)
#define CDETCTRL1_DCDEN_MASK		(0x1 << CDETCTRL1_DCDEN_SHIFT)
#define CDETCTRL1_DCD2SCT_MASK		(0x1 << CDETCTRL1_DCD2SCT_SHIFT)
#define CDETCTRL1_CDDELAY_MASK		(0x1 << CDETCTRL1_CDDELAY_SHIFT)
#define CDETCTRL1_DCDCPL_MASK		(0x1 << CDETCTRL1_DCDCPL_SHIFT)
#define CDETCTRL1_CDPDET_MASK		(0x1 << CDETCTRL1_CDPDET_SHIFT)

#define CDETCTRL2_VIDRMEN_SHIFT		(1)
#define CDETCTRL2_DXOVPEN_SHIFT		(3)
#define CDETCTRL2_VIDRMEN_MASK		(0x1 << CDETCTRL2_VIDRMEN_SHIFT)
#define CDETCTRL2_DXOVPEN_MASK		(0x1 << CDETCTRL2_DXOVPEN_SHIFT)

/* MAX77693 MUIC - CONTROL1~3 register */
#define COMN1SW_SHIFT			(0)
#define COMP2SW_SHIFT			(3)
#define COMN1SW_MASK			(0x7 << COMN1SW_SHIFT)
#define COMP2SW_MASK			(0x7 << COMP2SW_SHIFT)
#define COMP_SW_MASK			(COMP2SW_MASK | COMN1SW_MASK)
#define CONTROL1_SW_USB			((1 << COMP2SW_SHIFT) \
						| (1 << COMN1SW_SHIFT))
#define CONTROL1_SW_AUDIO		((2 << COMP2SW_SHIFT) \
						| (2 << COMN1SW_SHIFT))
#define CONTROL1_SW_UART		((3 << COMP2SW_SHIFT) \
						| (3 << COMN1SW_SHIFT))
#define CONTROL1_SW_OPEN		((0 << COMP2SW_SHIFT) \
						| (0 << COMN1SW_SHIFT))

#define CONTROL2_LOWPWR_SHIFT		(0)
#define CONTROL2_ADCEN_SHIFT		(1)
#define CONTROL2_CPEN_SHIFT		(2)
#define CONTROL2_SFOUTASRT_SHIFT	(3)
#define CONTROL2_SFOUTORD_SHIFT		(4)
#define CONTROL2_ACCDET_SHIFT		(5)
#define CONTROL2_USBCPINT_SHIFT		(6)
#define CONTROL2_RCPS_SHIFT		(7)
#define CONTROL2_LOWPWR_MASK		(0x1 << CONTROL2_LOWPWR_SHIFT)
#define CONTROL2_ADCEN_MASK		(0x1 << CONTROL2_ADCEN_SHIFT)
#define CONTROL2_CPEN_MASK		(0x1 << CONTROL2_CPEN_SHIFT)
#define CONTROL2_SFOUTASRT_MASK		(0x1 << CONTROL2_SFOUTASRT_SHIFT)
#define CONTROL2_SFOUTORD_MASK		(0x1 << CONTROL2_SFOUTORD_SHIFT)
#define CONTROL2_ACCDET_MASK		(0x1 << CONTROL2_ACCDET_SHIFT)
#define CONTROL2_USBCPINT_MASK		(0x1 << CONTROL2_USBCPINT_SHIFT)
#define CONTROL2_RCPS_MASK		(0x1 << CONTROL2_RCPS_SHIFT)

#define CONTROL3_JIGSET_SHIFT		(0)
#define CONTROL3_BTLDSET_SHIFT		(2)
#define CONTROL3_ADCDBSET_SHIFT		(4)
#define CONTROL3_JIGSET_MASK		(0x3 << CONTROL3_JIGSET_SHIFT)
#define CONTROL3_BTLDSET_MASK		(0x3 << CONTROL3_BTLDSET_SHIFT)
#define CONTROL3_ADCDBSET_MASK		(0x3 << CONTROL3_ADCDBSET_SHIFT)

enum max77693_muic_adc_debounce_time {
	ADC_DEBOUNCE_TIME_5MS = 0,
	ADC_DEBOUNCE_TIME_10MS,
	ADC_DEBOUNCE_TIME_25MS,
	ADC_DEBOUNCE_TIME_38_62MS,
};

struct max77693_muic_info {
	struct device *dev;
	struct max77693_dev *max77693;
	struct extcon_dev *edev;
	int prev_adc;
	int prev_adc_gnd;
	int prev_chg_type;
	u8 status[2];

	int irq;
	struct work_struct irq_work;
	struct mutex mutex;
};

enum max77693_muic_charger_type {
	MAX77693_CHARGER_TYPE_NONE = 0,
	MAX77693_CHARGER_TYPE_USB,
	MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT,
	MAX77693_CHARGER_TYPE_DEDICATED_CHG,
	MAX77693_CHARGER_TYPE_APPLE_500MA,
	MAX77693_CHARGER_TYPE_APPLE_1A_2A,
	MAX77693_CHARGER_TYPE_DEAD_BATTERY = 7,
};

/**
 * struct max77693_muic_irq
 * @irq: the index of irq list of MUIC device.
 * @name: the name of irq.
 * @virq: the virtual irq to use irq domain
 */
struct max77693_muic_irq {
	unsigned int irq;
	const char *name;
	unsigned int virq;
};

static struct max77693_muic_irq muic_irqs[] = {
	{ MAX77693_MUIC_IRQ_INT1_ADC,		"muic-ADC" },
	{ MAX77693_MUIC_IRQ_INT1_ADC_LOW,	"muic-ADCLOW" },
	{ MAX77693_MUIC_IRQ_INT1_ADC_ERR,	"muic-ADCError" },
	{ MAX77693_MUIC_IRQ_INT1_ADC1K,		"muic-ADC1K" },
	{ MAX77693_MUIC_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
	{ MAX77693_MUIC_IRQ_INT2_CHGDETREUN,	"muic-CHGDETREUN" },
	{ MAX77693_MUIC_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
	{ MAX77693_MUIC_IRQ_INT2_DXOVP,		"muic-DXOVP" },
	{ MAX77693_MUIC_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
	{ MAX77693_MUIC_IRQ_INT2_VIDRM,		"muic-VIDRM" },
	{ MAX77693_MUIC_IRQ_INT3_EOC,		"muic-EOC" },
	{ MAX77693_MUIC_IRQ_INT3_CGMBC,		"muic-CGMBC" },
	{ MAX77693_MUIC_IRQ_INT3_OVP,		"muic-OVP" },
	{ MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR,	"muic-MBCCHG_ERR" },
	{ MAX77693_MUIC_IRQ_INT3_CHG_ENABLED,	"muic-CHG_ENABLED" },
	{ MAX77693_MUIC_IRQ_INT3_BAT_DET,	"muic-BAT_DET" },
};

/* Define supported accessory type */
enum max77693_muic_acc_type {
	MAX77693_MUIC_ADC_GROUND = 0x0,
	MAX77693_MUIC_ADC_SEND_END_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S1_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S2_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S3_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S4_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S5_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S6_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S7_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S8_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S9_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S10_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S11_BUTTON,
	MAX77693_MUIC_ADC_REMOTE_S12_BUTTON,
	MAX77693_MUIC_ADC_RESERVED_ACC_1,
	MAX77693_MUIC_ADC_RESERVED_ACC_2,
	MAX77693_MUIC_ADC_RESERVED_ACC_3,
	MAX77693_MUIC_ADC_RESERVED_ACC_4,
	MAX77693_MUIC_ADC_RESERVED_ACC_5,
	MAX77693_MUIC_ADC_CEA936_AUDIO,
	MAX77693_MUIC_ADC_PHONE_POWERED_DEV,
	MAX77693_MUIC_ADC_TTY_CONVERTER,
	MAX77693_MUIC_ADC_UART_CABLE,
	MAX77693_MUIC_ADC_CEA936A_TYPE1_CHG,
	MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF,
	MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON,
	MAX77693_MUIC_ADC_AV_CABLE_NOLOAD,
	MAX77693_MUIC_ADC_CEA936A_TYPE2_CHG,
	MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF,
	MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON,
	MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE,
	MAX77693_MUIC_ADC_OPEN,

	/* The below accessories have same ADC value so ADCLow and
	   ADC1K bit is used to separate specific accessory */
	MAX77693_MUIC_GND_USB_OTG = 0x100,	/* ADC:0x0, ADCLow:0, ADC1K:0 */
	MAX77693_MUIC_GND_AV_CABLE_LOAD = 0x102,/* ADC:0x0, ADCLow:1, ADC1K:0 */
	MAX77693_MUIC_GND_MHL_CABLE = 0x103,	/* ADC:0x0, ADCLow:1, ADC1K:1 */
};

/* MAX77693 MUIC device support below list of accessories(external connector) */
const char *max77693_extcon_cable[] = {
	[0] = "USB",
	[1] = "USB-Host",
	[2] = "TA",
	[3] = "Fast-charger",
	[4] = "Slow-charger",
	[5] = "Charge-downstream",
	[6] = "MHL",
	[7] = "Audio-video-load",
	[8] = "Audio-video-noload",
	[9] = "JIG",

	NULL,
};

static int max77693_muic_set_debounce_time(struct max77693_muic_info *info,
		enum max77693_muic_adc_debounce_time time)
{
	int ret = 0;
	u8 ctrl3;

	switch (time) {
	case ADC_DEBOUNCE_TIME_5MS:
	case ADC_DEBOUNCE_TIME_10MS:
	case ADC_DEBOUNCE_TIME_25MS:
	case ADC_DEBOUNCE_TIME_38_62MS:
		ret = max77693_read_reg(info->max77693->regmap_muic,
				MAX77693_MUIC_REG_CTRL3, &ctrl3);
		ctrl3 &= ~CONTROL3_ADCDBSET_MASK;
		ctrl3 |= (time << CONTROL3_ADCDBSET_SHIFT);

		ret = max77693_write_reg(info->max77693->regmap_muic,
				MAX77693_MUIC_REG_CTRL3, ctrl3);
		if (ret) {
			dev_err(info->dev, "failed to set ADC debounce time\n");
			ret = -EINVAL;
		}
		break;
	default:
		dev_err(info->dev, "invalid ADC debounce time\n");
		ret = -EINVAL;
		break;
	}

	return ret;
};

static int max77693_muic_set_path(struct max77693_muic_info *info,
		u8 val, bool attached)
{
	int ret = 0;
	u8 ctrl1, ctrl2 = 0;

	if (attached)
		ctrl1 = val;
	else
		ctrl1 = CONTROL1_SW_OPEN;

	ret = max77693_update_reg(info->max77693->regmap_muic,
			MAX77693_MUIC_REG_CTRL1, ctrl1, COMP_SW_MASK);
	if (ret < 0) {
		dev_err(info->dev, "failed to update MUIC register\n");
		goto out;
	}

	if (attached)
		ctrl2 |= CONTROL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
	else
		ctrl2 |= CONTROL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */

	ret = max77693_update_reg(info->max77693->regmap_muic,
			MAX77693_MUIC_REG_CTRL2, ctrl2,
			CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
	if (ret < 0) {
		dev_err(info->dev, "failed to update MUIC register\n");
		goto out;
	}

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

static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info,
		bool attached)
{
	int ret = 0;
	int type;
	int adc, adc1k, adclow;

	if (attached) {
		adc = info->status[0] & STATUS1_ADC_MASK;
		adclow = info->status[0] & STATUS1_ADCLOW_MASK;
		adclow >>= STATUS1_ADCLOW_SHIFT;
		adc1k = info->status[0] & STATUS1_ADC1K_MASK;
		adc1k >>= STATUS1_ADC1K_SHIFT;

		/**
		 * [0x1][ADCLow][ADC1K]
		 * [0x1    0       0  ]	: USB_OTG
		 * [0x1    1       0  ] : Audio Video Cable with load
		 * [0x1    1       1  ] : MHL
		 */
		type = ((0x1 << 8) | (adclow << 1) | adc1k);

		/* Store previous ADC value to handle accessory
		   when accessory will be detached */
		info->prev_adc = adc;
		info->prev_adc_gnd = type;
	} else
		type = info->prev_adc_gnd;

	switch (type) {
	case MAX77693_MUIC_GND_USB_OTG:
		/* USB_OTG */
		ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
		if (ret < 0)
			goto out;
		extcon_set_cable_state(info->edev, "USB-Host", attached);
		break;
	case MAX77693_MUIC_GND_AV_CABLE_LOAD:
		/* Audio Video Cable with load */
		ret = max77693_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
		if (ret < 0)
			goto out;
		extcon_set_cable_state(info->edev,
				"Audio-video-load", attached);
		break;
	case MAX77693_MUIC_GND_MHL_CABLE:
		/* MHL */
		extcon_set_cable_state(info->edev, "MHL", attached);
		break;
	default:
		dev_err(info->dev, "failed to detect %s accessory\n",
			attached ? "attached" : "detached");
		dev_err(info->dev, "- adc:0x%x, adclow:0x%x, adc1k:0x%x\n",
			adc, adclow, adc1k);
		ret = -EINVAL;
		break;
	}

out:
	return ret;
}

static int max77693_muic_adc_handler(struct max77693_muic_info *info,
		int curr_adc, bool attached)
{
	int ret = 0;
	int adc;

	if (attached) {
		/* Store ADC value to handle accessory
		   when accessory will be detached */
		info->prev_adc = curr_adc;
		adc = curr_adc;
	} else
		adc = info->prev_adc;

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

	switch (adc) {
	case MAX77693_MUIC_ADC_GROUND:
		/* USB_OTG/MHL/Audio */
		max77693_muic_adc_ground_handler(info, attached);
		break;
	case MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF:
	case MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON:
		/* USB */
		ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
		if (ret < 0)
			goto out;
		extcon_set_cable_state(info->edev, "USB", attached);
		break;
	case MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF:
	case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:
		/* JIG */
		ret = max77693_muic_set_path(info, CONTROL1_SW_UART, attached);
		if (ret < 0)
			goto out;
		extcon_set_cable_state(info->edev, "JIG", attached);
		break;
	case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:
		/* Audio Video cable with no-load */
		ret = max77693_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
		if (ret < 0)
			goto out;
		extcon_set_cable_state(info->edev,
				"Audio-video-noload", attached);
		break;
	case MAX77693_MUIC_ADC_SEND_END_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S1_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S2_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S4_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S5_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S6_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S8_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S11_BUTTON:
	case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON:
	case MAX77693_MUIC_ADC_RESERVED_ACC_1:
	case MAX77693_MUIC_ADC_RESERVED_ACC_2:
	case MAX77693_MUIC_ADC_RESERVED_ACC_3:
	case MAX77693_MUIC_ADC_RESERVED_ACC_4:
	case MAX77693_MUIC_ADC_RESERVED_ACC_5:
	case MAX77693_MUIC_ADC_CEA936_AUDIO:
	case MAX77693_MUIC_ADC_PHONE_POWERED_DEV:
	case MAX77693_MUIC_ADC_TTY_CONVERTER:
	case MAX77693_MUIC_ADC_UART_CABLE:
	case MAX77693_MUIC_ADC_CEA936A_TYPE1_CHG:
	case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:
	case MAX77693_MUIC_ADC_CEA936A_TYPE2_CHG:
		/* This accessory isn't used in general case if it is specially
		   needed to detect additional accessory, should implement
		   proper operation when this accessory is attached/detached. */
		dev_info(info->dev,
			"accessory is %s but it isn't used (adc:0x%x)\n",
			attached ? "attached" : "detached", adc);
		goto out;
	default:
		dev_err(info->dev,
			"failed to detect %s accessory (adc:0x%x)\n",
			attached ? "attached" : "detached", adc);
		ret = -EINVAL;
		goto out;
	}

out:
	return ret;
}

static int max77693_muic_chg_handler(struct max77693_muic_info *info,
		int curr_chg_type, bool attached)
{
	int ret = 0;
	int chg_type;

	if (attached) {
		/* Store previous charger type to control
		   when charger accessory will be detached */
		info->prev_chg_type = curr_chg_type;
		chg_type = curr_chg_type;
	} else
		chg_type = info->prev_chg_type;

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

	switch (chg_type) {
	case MAX77693_CHARGER_TYPE_USB:
		ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
		if (ret < 0)
			goto out;
		extcon_set_cable_state(info->edev, "USB", attached);
		break;
	case MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT:
		extcon_set_cable_state(info->edev,
				"Charge-downstream", attached);
		break;
	case MAX77693_CHARGER_TYPE_DEDICATED_CHG:
		extcon_set_cable_state(info->edev, "TA", attached);
		break;
	case MAX77693_CHARGER_TYPE_APPLE_500MA:
		extcon_set_cable_state(info->edev, "Slow-charger", attached);
		break;
	case MAX77693_CHARGER_TYPE_APPLE_1A_2A:
		extcon_set_cable_state(info->edev, "Fast-charger", attached);
		break;
	case MAX77693_CHARGER_TYPE_DEAD_BATTERY:
		break;
	default:
		dev_err(info->dev,
			"failed to detect %s accessory (chg_type:0x%x)\n",
			attached ? "attached" : "detached", chg_type);
		ret = -EINVAL;
		goto out;
	}

out:
	return ret;
}

static void max77693_muic_irq_work(struct work_struct *work)
{
	struct max77693_muic_info *info = container_of(work,
			struct max77693_muic_info, irq_work);
	int curr_adc, curr_chg_type;
	int irq_type = -1;
	int i, ret = 0;
	bool attached = true;

	if (!info->edev)
		return;

	mutex_lock(&info->mutex);

	for (i = 0 ; i < ARRAY_SIZE(muic_irqs) ; i++)
		if (info->irq == muic_irqs[i].virq)
			irq_type = muic_irqs[i].irq;

	ret = max77693_bulk_read(info->max77693->regmap_muic,
			MAX77693_MUIC_REG_STATUS1, 2, info->status);
	if (ret) {
		dev_err(info->dev, "failed to read MUIC register\n");
		mutex_unlock(&info->mutex);
		return;
	}

	switch (irq_type) {
	case MAX77693_MUIC_IRQ_INT1_ADC:
	case MAX77693_MUIC_IRQ_INT1_ADC_LOW:
	case MAX77693_MUIC_IRQ_INT1_ADC_ERR:
	case MAX77693_MUIC_IRQ_INT1_ADC1K:
		/* Handle all of accessory except for
		   type of charger accessory */
		curr_adc = info->status[0] & STATUS1_ADC_MASK;
		curr_adc >>= STATUS1_ADC_SHIFT;

		/* Check accessory state which is either detached or attached */
		if (curr_adc == MAX77693_MUIC_ADC_OPEN)
			attached = false;

		ret = max77693_muic_adc_handler(info, curr_adc, attached);
		break;
	case MAX77693_MUIC_IRQ_INT2_CHGTYP:
	case MAX77693_MUIC_IRQ_INT2_CHGDETREUN:
	case MAX77693_MUIC_IRQ_INT2_DCDTMR:
	case MAX77693_MUIC_IRQ_INT2_DXOVP:
	case MAX77693_MUIC_IRQ_INT2_VBVOLT:
	case MAX77693_MUIC_IRQ_INT2_VIDRM:
		/* Handle charger accessory */
		curr_chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
		curr_chg_type >>= STATUS2_CHGTYP_SHIFT;

		/* Check charger accessory state which
		   is either detached or attached */
		if (curr_chg_type == MAX77693_CHARGER_TYPE_NONE)
			attached = false;

		ret = max77693_muic_chg_handler(info, curr_chg_type, attached);
		break;
	case MAX77693_MUIC_IRQ_INT3_EOC:
	case MAX77693_MUIC_IRQ_INT3_CGMBC:
	case MAX77693_MUIC_IRQ_INT3_OVP:
	case MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR:
	case MAX77693_MUIC_IRQ_INT3_CHG_ENABLED:
	case MAX77693_MUIC_IRQ_INT3_BAT_DET:
		break;
	default:
		dev_err(info->dev, "muic interrupt: irq %d occurred\n",
				irq_type);
		break;
	}

	if (ret < 0)
		dev_err(info->dev, "failed to handle MUIC interrupt\n");

	mutex_unlock(&info->mutex);

	return;
}

static irqreturn_t max77693_muic_irq_handler(int irq, void *data)
{
	struct max77693_muic_info *info = data;

	info->irq = irq;
	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
}

static struct regmap_config max77693_muic_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int max77693_muic_detect_accessory(struct max77693_muic_info *info)
{
	int ret = 0;
	int adc, chg_type;

	mutex_lock(&info->mutex);

	/* Read STATUSx register to detect accessory */
	ret = max77693_bulk_read(info->max77693->regmap_muic,
			MAX77693_MUIC_REG_STATUS1, 2, info->status);
	if (ret) {
		dev_err(info->dev, "failed to read MUIC register\n");
		mutex_unlock(&info->mutex);
		return -EINVAL;
	}

	adc = info->status[0] & STATUS1_ADC_MASK;
	adc >>= STATUS1_ADC_SHIFT;

	if (adc != MAX77693_MUIC_ADC_OPEN) {
		dev_info(info->dev,
			"external connector is attached (adc:0x%02x)\n", adc);

		ret = max77693_muic_adc_handler(info, adc, true);
		if (ret < 0)
			dev_err(info->dev, "failed to detect accessory\n");
		goto out;
	}

	chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
	chg_type >>= STATUS2_CHGTYP_SHIFT;

	if (chg_type != MAX77693_CHARGER_TYPE_NONE) {
		dev_info(info->dev,
			"external connector is attached (chg_type:0x%x)\n",
			chg_type);

		max77693_muic_chg_handler(info, chg_type, true);
		if (ret < 0)
			dev_err(info->dev, "failed to detect charger accessory\n");
	}

out:
	mutex_unlock(&info->mutex);
	return ret;
}

static int __devinit max77693_muic_probe(struct platform_device *pdev)
{
	struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
	struct max77693_muic_info *info;
	int ret, i;
	u8 id;

	info = kzalloc(sizeof(struct max77693_muic_info), GFP_KERNEL);
	if (!info) {
		dev_err(&pdev->dev, "failed to allocate memory\n");
		ret = -ENOMEM;
		goto err_kfree;
	}
	info->dev = &pdev->dev;
	info->max77693 = max77693;
	if (info->max77693->regmap_muic)
		dev_dbg(&pdev->dev, "allocate register map\n");
	else {
		info->max77693->regmap_muic = devm_regmap_init_i2c(
						info->max77693->muic,
						&max77693_muic_regmap_config);
		if (IS_ERR(info->max77693->regmap_muic)) {
			ret = PTR_ERR(info->max77693->regmap_muic);
			dev_err(max77693->dev,
				"failed to allocate register map: %d\n", ret);
			goto err_regmap;
		}
	}
	platform_set_drvdata(pdev, info);
	mutex_init(&info->mutex);

	INIT_WORK(&info->irq_work, max77693_muic_irq_work);

	/* Support irq domain for MAX77693 MUIC device */
	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
		struct max77693_muic_irq *muic_irq = &muic_irqs[i];
		int virq = 0;

		virq = irq_create_mapping(max77693->irq_domain, muic_irq->irq);
		if (!virq)
			goto err_irq;
		muic_irq->virq = virq;

		ret = request_threaded_irq(virq, NULL,
				max77693_muic_irq_handler,
				IRQF_ONESHOT, muic_irq->name, info);
		if (ret) {
			dev_err(&pdev->dev,
				"failed: irq request (IRQ: %d,"
				" error :%d)\n",
				muic_irq->irq, ret);

			for (i = i - 1; i >= 0; i--)
				free_irq(muic_irq->virq, info);
			goto err_irq;
		}
	}

	/* Initialize extcon device */
	info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL);
	if (!info->edev) {
		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
		ret = -ENOMEM;
		goto err_irq;
	}
	info->edev->name = DEV_NAME;
	info->edev->supported_cable = max77693_extcon_cable;
	ret = extcon_dev_register(info->edev, NULL);
	if (ret) {
		dev_err(&pdev->dev, "failed to register extcon device\n");
		goto err_extcon;
	}

	/* Check revision number of MUIC device*/
	ret = max77693_read_reg(info->max77693->regmap_muic,
			MAX77693_MUIC_REG_ID, &id);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to read revision number\n");
		goto err_extcon;
	}
	dev_info(info->dev, "device ID : 0x%x\n", id);

	/* Set ADC debounce time */
	max77693_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);

	/* Detect accessory on boot */
	max77693_muic_detect_accessory(info);

	return ret;

err_extcon:
	kfree(info->edev);
err_irq:
err_regmap:
	kfree(info);
err_kfree:
	return ret;
}

static int __devexit max77693_muic_remove(struct platform_device *pdev)
{
	struct max77693_muic_info *info = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
		free_irq(muic_irqs[i].virq, info);
	cancel_work_sync(&info->irq_work);
	extcon_dev_unregister(info->edev);
	kfree(info);

	return 0;
}

static struct platform_driver max77693_muic_driver = {
	.driver		= {
		.name	= DEV_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= max77693_muic_probe,
	.remove		= __devexit_p(max77693_muic_remove),
};

module_platform_driver(max77693_muic_driver);

MODULE_DESCRIPTION("Maxim MAX77693 Extcon driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:extcon-max77693");