summaryrefslogtreecommitdiff
path: root/drivers/extcon/extcon-max8997.c
blob: 20772ad4adc0eeebf63038c44c753dbf36832228 (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
/*
 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
 *
 *  Copyright (C) 2012 Samsung Electronics
 *  Donggeun Kim <dg77.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.
 *
 * 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/kobject.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
#include <linux/extcon.h>
#include <linux/irqdomain.h>

#define	DEV_NAME			"max8997-muic"
#define	DELAY_MS_DEFAULT		20000		/* unit: millisecond */

enum max8997_muic_adc_debounce_time {
	ADC_DEBOUNCE_TIME_0_5MS = 0,	/* 0.5ms */
	ADC_DEBOUNCE_TIME_10MS,		/* 10ms */
	ADC_DEBOUNCE_TIME_25MS,		/* 25ms */
	ADC_DEBOUNCE_TIME_38_62MS,	/* 38.62ms */
};

struct max8997_muic_irq {
	unsigned int irq;
	const char *name;
	unsigned int virq;
};

static struct max8997_muic_irq muic_irqs[] = {
	{ MAX8997_MUICIRQ_ADCError,	"muic-ADCERROR" },
	{ MAX8997_MUICIRQ_ADCLow,	"muic-ADCLOW" },
	{ MAX8997_MUICIRQ_ADC,		"muic-ADC" },
	{ MAX8997_MUICIRQ_VBVolt,	"muic-VBVOLT" },
	{ MAX8997_MUICIRQ_DBChg,	"muic-DBCHG" },
	{ MAX8997_MUICIRQ_DCDTmr,	"muic-DCDTMR" },
	{ MAX8997_MUICIRQ_ChgDetRun,	"muic-CHGDETRUN" },
	{ MAX8997_MUICIRQ_ChgTyp,	"muic-CHGTYP" },
	{ MAX8997_MUICIRQ_OVP,		"muic-OVP" },
};

/* Define supported cable type */
enum max8997_muic_acc_type {
	MAX8997_MUIC_ADC_GROUND = 0x0,
	MAX8997_MUIC_ADC_MHL,			/* MHL*/
	MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
	MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
	MAX8997_MUIC_ADC_RESERVED_ACC_1,
	MAX8997_MUIC_ADC_RESERVED_ACC_2,
	MAX8997_MUIC_ADC_RESERVED_ACC_3,
	MAX8997_MUIC_ADC_RESERVED_ACC_4,
	MAX8997_MUIC_ADC_RESERVED_ACC_5,
	MAX8997_MUIC_ADC_CEA936_AUDIO,
	MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
	MAX8997_MUIC_ADC_TTY_CONVERTER,
	MAX8997_MUIC_ADC_UART_CABLE,
	MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
	MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,	/* JIG-USB-OFF */
	MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,	/* JIG-USB-ON */
	MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,	/* DESKDOCK */
	MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
	MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF,	/* JIG-UART */
	MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,	/* CARDOCK */
	MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
	MAX8997_MUIC_ADC_OPEN,			/* OPEN */
};

enum max8997_muic_cable_group {
	MAX8997_CABLE_GROUP_ADC = 0,
	MAX8997_CABLE_GROUP_ADC_GND,
	MAX8997_CABLE_GROUP_CHG,
	MAX8997_CABLE_GROUP_VBVOLT,
};

enum max8997_muic_usb_type {
	MAX8997_USB_HOST,
	MAX8997_USB_DEVICE,
};

enum max8997_muic_charger_type {
	MAX8997_CHARGER_TYPE_NONE = 0,
	MAX8997_CHARGER_TYPE_USB,
	MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
	MAX8997_CHARGER_TYPE_DEDICATED_CHG,
	MAX8997_CHARGER_TYPE_500MA,
	MAX8997_CHARGER_TYPE_1A,
	MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
};

struct max8997_muic_info {
	struct device *dev;
	struct i2c_client *muic;
	struct extcon_dev *edev;
	int prev_cable_type;
	int prev_chg_type;
	u8 status[2];

	int irq;
	struct work_struct irq_work;
	struct mutex mutex;

	struct max8997_muic_platform_data *muic_pdata;
	enum max8997_muic_charger_type pre_charger_type;

	/*
	 * Use delayed workqueue to detect cable state and then
	 * notify cable state to notifiee/platform through uevent.
	 * After completing the booting of platform, the extcon provider
	 * driver should notify cable state to upper layer.
	 */
	struct delayed_work wq_detcable;

	/*
	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
	 * h/w path of COMP2/COMN1 on CONTROL1 register.
	 */
	int path_usb;
	int path_uart;
};

enum {
	EXTCON_CABLE_USB = 0,
	EXTCON_CABLE_USB_HOST,
	EXTCON_CABLE_TA,
	EXTCON_CABLE_FAST_CHARGER,
	EXTCON_CABLE_SLOW_CHARGER,
	EXTCON_CABLE_CHARGE_DOWNSTREAM,
	EXTCON_CABLE_MHL,
	EXTCON_CABLE_DOCK_DESK,
	EXTCON_CABLE_DOCK_CARD,
	EXTCON_CABLE_JIG,

	_EXTCON_CABLE_NUM,
};

static const char *max8997_extcon_cable[] = {
	[EXTCON_CABLE_USB]			= "USB",
	[EXTCON_CABLE_USB_HOST]			= "USB-Host",
	[EXTCON_CABLE_TA]			= "TA",
	[EXTCON_CABLE_FAST_CHARGER]		= "Fast-charger",
	[EXTCON_CABLE_SLOW_CHARGER]		= "Slow-charger",
	[EXTCON_CABLE_CHARGE_DOWNSTREAM]	= "Charge-downstream",
	[EXTCON_CABLE_MHL]			= "MHL",
	[EXTCON_CABLE_DOCK_DESK]		= "Dock-Desk",
	[EXTCON_CABLE_DOCK_CARD]		= "Dock-Card",
	[EXTCON_CABLE_JIG]			= "JIG",

	NULL,
};

/*
 * max8997_muic_set_debounce_time - Set the debounce time of ADC
 * @info: the instance including private data of max8997 MUIC
 * @time: the debounce time of ADC
 */
static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
		enum max8997_muic_adc_debounce_time time)
{
	int ret;

	switch (time) {
	case ADC_DEBOUNCE_TIME_0_5MS:
	case ADC_DEBOUNCE_TIME_10MS:
	case ADC_DEBOUNCE_TIME_25MS:
	case ADC_DEBOUNCE_TIME_38_62MS:
		ret = max8997_update_reg(info->muic,
					  MAX8997_MUIC_REG_CONTROL3,
					  time << CONTROL3_ADCDBSET_SHIFT,
					  CONTROL3_ADCDBSET_MASK);
		if (ret) {
			dev_err(info->dev, "failed to set ADC debounce time\n");
			return -EAGAIN;
		}
		break;
	default:
		dev_err(info->dev, "invalid ADC debounce time\n");
		return -EINVAL;
	}

	return 0;
};

/*
 * max8997_muic_set_path - Set hardware line according to attached cable
 * @info: the instance including private data of max8997 MUIC
 * @value: the path according to attached cable
 * @attached: the state of cable (true:attached, false:detached)
 *
 * The max8997 MUIC device share outside H/W line among a varity of cables,
 * so this function set internal path of H/W line according to the type of
 * attached cable.
 */
static int max8997_muic_set_path(struct max8997_muic_info *info,
		u8 val, bool attached)
{
	int ret = 0;
	u8 ctrl1, ctrl2 = 0;

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

	ret = max8997_update_reg(info->muic,
			MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
	if (ret < 0) {
		dev_err(info->dev, "failed to update MUIC register\n");
		return -EAGAIN;
	}

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

	ret = max8997_update_reg(info->muic,
			MAX8997_MUIC_REG_CONTROL2, ctrl2,
			CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
	if (ret < 0) {
		dev_err(info->dev, "failed to update MUIC register\n");
		return -EAGAIN;
	}

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

	return 0;
}

/*
 * max8997_muic_get_cable_type - Return cable type and check cable state
 * @info: the instance including private data of max8997 MUIC
 * @group: the path according to attached cable
 * @attached: store cable state and return
 *
 * This function check the cable state either attached or detached,
 * and then divide precise type of cable according to cable group.
 *	- MAX8997_CABLE_GROUP_ADC
 *	- MAX8997_CABLE_GROUP_CHG
 */
static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
		enum max8997_muic_cable_group group, bool *attached)
{
	int cable_type = 0;
	int adc;
	int chg_type;

	switch (group) {
	case MAX8997_CABLE_GROUP_ADC:
		/*
		 * Read ADC value to check cable type and decide cable state
		 * according to cable type
		 */
		adc = info->status[0] & STATUS1_ADC_MASK;
		adc >>= STATUS1_ADC_SHIFT;

		/*
		 * Check current cable state/cable type and store cable type
		 * (info->prev_cable_type) for handling cable when cable is
		 * detached.
		 */
		if (adc == MAX8997_MUIC_ADC_OPEN) {
			*attached = false;

			cable_type = info->prev_cable_type;
			info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
		} else {
			*attached = true;

			cable_type = info->prev_cable_type = adc;
		}
		break;
	case MAX8997_CABLE_GROUP_CHG:
		/*
		 * Read charger type to check cable type and decide cable state
		 * according to type of charger cable.
		 */
		chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
		chg_type >>= STATUS2_CHGTYP_SHIFT;

		if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
			*attached = false;

			cable_type = info->prev_chg_type;
			info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
		} else {
			*attached = true;

			/*
			 * Check current cable state/cable type and store cable
			 * type(info->prev_chg_type) for handling cable when
			 * charger cable is detached.
			 */
			cable_type = info->prev_chg_type = chg_type;
		}

		break;
	default:
		dev_err(info->dev, "Unknown cable group (%d)\n", group);
		cable_type = -EINVAL;
		break;
	}

	return cable_type;
}

static int max8997_muic_handle_usb(struct max8997_muic_info *info,
			enum max8997_muic_usb_type usb_type, bool attached)
{
	int ret = 0;

	if (usb_type == MAX8997_USB_HOST) {
		ret = max8997_muic_set_path(info, info->path_usb, attached);
		if (ret < 0) {
			dev_err(info->dev, "failed to update muic register\n");
			return ret;
		}
	}

	switch (usb_type) {
	case MAX8997_USB_HOST:
		extcon_set_cable_state(info->edev, "USB-Host", attached);
		break;
	case MAX8997_USB_DEVICE:
		extcon_set_cable_state(info->edev, "USB", attached);
		break;
	default:
		dev_err(info->dev, "failed to detect %s usb cable\n",
			attached ? "attached" : "detached");
		return -EINVAL;
	}

	return 0;
}

static int max8997_muic_handle_dock(struct max8997_muic_info *info,
			int cable_type, bool attached)
{
	int ret = 0;

	ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
	if (ret) {
		dev_err(info->dev, "failed to update muic register\n");
		return ret;
	}

	switch (cable_type) {
	case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
		extcon_set_cable_state(info->edev, "Dock-desk", attached);
		break;
	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
		extcon_set_cable_state(info->edev, "Dock-card", attached);
		break;
	default:
		dev_err(info->dev, "failed to detect %s dock device\n",
			attached ? "attached" : "detached");
		return -EINVAL;
	}

	return 0;
}

static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
			bool attached)
{
	int ret = 0;

	/* switch to UART */
	ret = max8997_muic_set_path(info, info->path_uart, attached);
	if (ret) {
		dev_err(info->dev, "failed to update muic register\n");
		return -EINVAL;
	}

	extcon_set_cable_state(info->edev, "JIG", attached);

	return 0;
}

static int max8997_muic_adc_handler(struct max8997_muic_info *info)
{
	int cable_type;
	bool attached;
	int ret = 0;

	/* Check cable state which is either detached or attached */
	cable_type = max8997_muic_get_cable_type(info,
				MAX8997_CABLE_GROUP_ADC, &attached);

	switch (cable_type) {
	case MAX8997_MUIC_ADC_GROUND:
		ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
		if (ret < 0)
			return ret;
		break;
	case MAX8997_MUIC_ADC_MHL:
		extcon_set_cable_state(info->edev, "MHL", attached);
		break;
	case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
	case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
		ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, attached);
		if (ret < 0)
			return ret;
		break;
	case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
		ret = max8997_muic_handle_dock(info, cable_type, attached);
		if (ret < 0)
			return ret;
		break;
	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
		ret = max8997_muic_handle_jig_uart(info, attached);
		break;
	case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
	case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
	case MAX8997_MUIC_ADC_RESERVED_ACC_1:
	case MAX8997_MUIC_ADC_RESERVED_ACC_2:
	case MAX8997_MUIC_ADC_RESERVED_ACC_3:
	case MAX8997_MUIC_ADC_RESERVED_ACC_4:
	case MAX8997_MUIC_ADC_RESERVED_ACC_5:
	case MAX8997_MUIC_ADC_CEA936_AUDIO:
	case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
	case MAX8997_MUIC_ADC_TTY_CONVERTER:
	case MAX8997_MUIC_ADC_UART_CABLE:
	case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
	case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
	case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
		/*
		 * This cable isn't used in general case if it is specially
		 * needed to detect additional cable, should implement
		 * proper operation when this cable is attached/detached.
		 */
		dev_info(info->dev,
			"cable is %s but it isn't used (type:0x%x)\n",
			attached ? "attached" : "detached", cable_type);
		return -EAGAIN;
	default:
		dev_err(info->dev,
			"failed to detect %s unknown cable (type:0x%x)\n",
			attached ? "attached" : "detached", cable_type);
		return -EINVAL;
	}

	return 0;
}

static int max8997_muic_chg_handler(struct max8997_muic_info *info)
{
	int chg_type;
	bool attached;
	int adc;

	chg_type = max8997_muic_get_cable_type(info,
				MAX8997_CABLE_GROUP_CHG, &attached);

	switch (chg_type) {
	case MAX8997_CHARGER_TYPE_NONE:
		break;
	case MAX8997_CHARGER_TYPE_USB:
		adc = info->status[0] & STATUS1_ADC_MASK;
		adc >>= STATUS1_ADC_SHIFT;

		if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
			max8997_muic_handle_usb(info,
					MAX8997_USB_DEVICE, attached);
		}
		break;
	case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
		extcon_set_cable_state(info->edev, "Charge-downstream", attached);
		break;
	case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
		extcon_set_cable_state(info->edev, "TA", attached);
		break;
	case MAX8997_CHARGER_TYPE_500MA:
		extcon_set_cable_state(info->edev, "Slow-charger", attached);
		break;
	case MAX8997_CHARGER_TYPE_1A:
		extcon_set_cable_state(info->edev, "Fast-charger", attached);
		break;
	default:
		dev_err(info->dev,
			"failed to detect %s unknown chg cable (type:0x%x)\n",
			attached ? "attached" : "detached", chg_type);
		return -EINVAL;
	}

	return 0;
}

static void max8997_muic_irq_work(struct work_struct *work)
{
	struct max8997_muic_info *info = container_of(work,
			struct max8997_muic_info, irq_work);
	int irq_type = 0;
	int i, ret;

	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 = max8997_bulk_read(info->muic, MAX8997_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 MAX8997_MUICIRQ_ADCError:
	case MAX8997_MUICIRQ_ADCLow:
	case MAX8997_MUICIRQ_ADC:
		/* Handle all of cable except for charger cable */
		ret = max8997_muic_adc_handler(info);
		break;
	case MAX8997_MUICIRQ_VBVolt:
	case MAX8997_MUICIRQ_DBChg:
	case MAX8997_MUICIRQ_DCDTmr:
	case MAX8997_MUICIRQ_ChgDetRun:
	case MAX8997_MUICIRQ_ChgTyp:
		/* Handle charger cable */
		ret = max8997_muic_chg_handler(info);
		break;
	case MAX8997_MUICIRQ_OVP:
		break;
	default:
		dev_info(info->dev, "misc interrupt: irq %d occurred\n",
				irq_type);
		mutex_unlock(&info->mutex);
		return;
	}

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

	mutex_unlock(&info->mutex);

	return;
}

static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
{
	struct max8997_muic_info *info = data;

	dev_dbg(info->dev, "irq:%d\n", irq);
	info->irq = irq;

	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
}

static int max8997_muic_detect_dev(struct max8997_muic_info *info)
{
	int ret = 0;
	int adc;
	int chg_type;
	bool attached;

	mutex_lock(&info->mutex);

	/* Read STATUSx register to detect accessory */
	ret = max8997_bulk_read(info->muic,
			MAX8997_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 = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
					&attached);
	if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
		ret = max8997_muic_adc_handler(info);
		if (ret < 0) {
			dev_err(info->dev, "Cannot detect ADC cable\n");
			mutex_unlock(&info->mutex);
			return ret;
		}
	}

	chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
					&attached);
	if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
		ret = max8997_muic_chg_handler(info);
		if (ret < 0) {
			dev_err(info->dev, "Cannot detect charger cable\n");
			mutex_unlock(&info->mutex);
			return ret;
		}
	}

	mutex_unlock(&info->mutex);

	return 0;
}

static void max8997_muic_detect_cable_wq(struct work_struct *work)
{
	struct max8997_muic_info *info = container_of(to_delayed_work(work),
				struct max8997_muic_info, wq_detcable);
	int ret;

	ret = max8997_muic_detect_dev(info);
	if (ret < 0)
		dev_err(info->dev, "failed to detect cable type\n");
}

static int max8997_muic_probe(struct platform_device *pdev)
{
	struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
	struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
	struct max8997_muic_info *info;
	int delay_jiffies;
	int ret, i;

	info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
			    GFP_KERNEL);
	if (!info) {
		dev_err(&pdev->dev, "failed to allocate memory\n");
		return -ENOMEM;
	}

	info->dev = &pdev->dev;
	info->muic = max8997->muic;

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

	INIT_WORK(&info->irq_work, max8997_muic_irq_work);

	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
		struct max8997_muic_irq *muic_irq = &muic_irqs[i];
		unsigned int virq = 0;

		virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
		if (!virq) {
			ret = -EINVAL;
			goto err_irq;
		}
		muic_irq->virq = virq;

		ret = request_threaded_irq(virq, NULL,
				max8997_muic_irq_handler,
				IRQF_NO_SUSPEND,
				muic_irq->name, info);
		if (ret) {
			dev_err(&pdev->dev,
				"failed: irq request (IRQ: %d,"
				" error :%d)\n",
				muic_irq->irq, ret);
			goto err_irq;
		}
	}

	/* External connector */
	info->edev = devm_kzalloc(&pdev->dev, 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 = max8997_extcon_cable;
	ret = extcon_dev_register(info->edev, NULL);
	if (ret) {
		dev_err(&pdev->dev, "failed to register extcon device\n");
		goto err_irq;
	}

	if (pdata->muic_pdata) {
		struct max8997_muic_platform_data *muic_pdata
			= pdata->muic_pdata;

		/* Initialize registers according to platform data */
		for (i = 0; i < muic_pdata->num_init_data; i++) {
			max8997_write_reg(info->muic,
					muic_pdata->init_data[i].addr,
					muic_pdata->init_data[i].data);
		}

		/*
		 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
		 * h/w path of COMP2/COMN1 on CONTROL1 register.
		 */
		if (muic_pdata->path_uart)
			info->path_uart = muic_pdata->path_uart;
		else
			info->path_uart = CONTROL1_SW_UART;

		if (muic_pdata->path_usb)
			info->path_usb = muic_pdata->path_usb;
		else
			info->path_usb = CONTROL1_SW_USB;

		/*
		 * Default delay time for detecting cable state
		 * after certain time.
		 */
		if (muic_pdata->detcable_delay_ms)
			delay_jiffies =
				msecs_to_jiffies(muic_pdata->detcable_delay_ms);
		else
			delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
	} else {
		info->path_uart = CONTROL1_SW_UART;
		info->path_usb = CONTROL1_SW_USB;
		delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
	}

	/* Set initial path for UART */
	 max8997_muic_set_path(info, info->path_uart, true);

	/* Set ADC debounce time */
	max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);

	/*
	 * Detect accessory after completing the initialization of platform
	 *
	 * - Use delayed workqueue to detect cable state and then
	 * notify cable state to notifiee/platform through uevent.
	 * After completing the booting of platform, the extcon provider
	 * driver should notify cable state to upper layer.
	 */
	INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
	schedule_delayed_work(&info->wq_detcable, delay_jiffies);

	return 0;

err_irq:
	while (--i >= 0)
		free_irq(muic_irqs[i].virq, info);
	return ret;
}

static int max8997_muic_remove(struct platform_device *pdev)
{
	struct max8997_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);

	return 0;
}

static struct platform_driver max8997_muic_driver = {
	.driver		= {
		.name	= DEV_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= max8997_muic_probe,
	.remove		= max8997_muic_remove,
};

module_platform_driver(max8997_muic_driver);

MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_LICENSE("GPL");