1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
4 //
5 //  Copyright (C) 2012 Samsung Electronics
6 //  Donggeun Kim <dg77.kim@samsung.com>
7 
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/i2c.h>
11 #include <linux/slab.h>
12 #include <linux/interrupt.h>
13 #include <linux/err.h>
14 #include <linux/platform_device.h>
15 #include <linux/kobject.h>
16 #include <linux/mfd/max8997.h>
17 #include <linux/mfd/max8997-private.h>
18 #include <linux/extcon-provider.h>
19 #include <linux/irqdomain.h>
20 
21 #define	DEV_NAME			"max8997-muic"
22 #define	DELAY_MS_DEFAULT		20000		/* unit: millisecond */
23 
24 enum max8997_muic_adc_debounce_time {
25 	ADC_DEBOUNCE_TIME_0_5MS = 0,	/* 0.5ms */
26 	ADC_DEBOUNCE_TIME_10MS,		/* 10ms */
27 	ADC_DEBOUNCE_TIME_25MS,		/* 25ms */
28 	ADC_DEBOUNCE_TIME_38_62MS,	/* 38.62ms */
29 };
30 
31 struct max8997_muic_irq {
32 	unsigned int irq;
33 	const char *name;
34 	unsigned int virq;
35 };
36 
37 static struct max8997_muic_irq muic_irqs[] = {
38 	{ MAX8997_MUICIRQ_ADCError,	"muic-ADCERROR" },
39 	{ MAX8997_MUICIRQ_ADCLow,	"muic-ADCLOW" },
40 	{ MAX8997_MUICIRQ_ADC,		"muic-ADC" },
41 	{ MAX8997_MUICIRQ_VBVolt,	"muic-VBVOLT" },
42 	{ MAX8997_MUICIRQ_DBChg,	"muic-DBCHG" },
43 	{ MAX8997_MUICIRQ_DCDTmr,	"muic-DCDTMR" },
44 	{ MAX8997_MUICIRQ_ChgDetRun,	"muic-CHGDETRUN" },
45 	{ MAX8997_MUICIRQ_ChgTyp,	"muic-CHGTYP" },
46 	{ MAX8997_MUICIRQ_OVP,		"muic-OVP" },
47 };
48 
49 /* Define supported cable type */
50 enum max8997_muic_acc_type {
51 	MAX8997_MUIC_ADC_GROUND = 0x0,
52 	MAX8997_MUIC_ADC_MHL,			/* MHL*/
53 	MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
54 	MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
55 	MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
56 	MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
57 	MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
58 	MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
59 	MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
60 	MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
61 	MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
62 	MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
63 	MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
64 	MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
65 	MAX8997_MUIC_ADC_RESERVED_ACC_1,
66 	MAX8997_MUIC_ADC_RESERVED_ACC_2,
67 	MAX8997_MUIC_ADC_RESERVED_ACC_3,
68 	MAX8997_MUIC_ADC_RESERVED_ACC_4,
69 	MAX8997_MUIC_ADC_RESERVED_ACC_5,
70 	MAX8997_MUIC_ADC_CEA936_AUDIO,
71 	MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
72 	MAX8997_MUIC_ADC_TTY_CONVERTER,
73 	MAX8997_MUIC_ADC_UART_CABLE,
74 	MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
75 	MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,	/* JIG-USB-OFF */
76 	MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,	/* JIG-USB-ON */
77 	MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,	/* DESKDOCK */
78 	MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
79 	MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF,	/* JIG-UART */
80 	MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,	/* CARDOCK */
81 	MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
82 	MAX8997_MUIC_ADC_OPEN,			/* OPEN */
83 };
84 
85 enum max8997_muic_cable_group {
86 	MAX8997_CABLE_GROUP_ADC = 0,
87 	MAX8997_CABLE_GROUP_ADC_GND,
88 	MAX8997_CABLE_GROUP_CHG,
89 	MAX8997_CABLE_GROUP_VBVOLT,
90 };
91 
92 enum max8997_muic_usb_type {
93 	MAX8997_USB_HOST,
94 	MAX8997_USB_DEVICE,
95 };
96 
97 enum max8997_muic_charger_type {
98 	MAX8997_CHARGER_TYPE_NONE = 0,
99 	MAX8997_CHARGER_TYPE_USB,
100 	MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
101 	MAX8997_CHARGER_TYPE_DEDICATED_CHG,
102 	MAX8997_CHARGER_TYPE_500MA,
103 	MAX8997_CHARGER_TYPE_1A,
104 	MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
105 };
106 
107 struct max8997_muic_info {
108 	struct device *dev;
109 	struct i2c_client *muic;
110 	struct extcon_dev *edev;
111 	int prev_cable_type;
112 	int prev_chg_type;
113 	u8 status[2];
114 
115 	int irq;
116 	struct work_struct irq_work;
117 	struct mutex mutex;
118 
119 	struct max8997_muic_platform_data *muic_pdata;
120 	enum max8997_muic_charger_type pre_charger_type;
121 
122 	/*
123 	 * Use delayed workqueue to detect cable state and then
124 	 * notify cable state to notifiee/platform through uevent.
125 	 * After completing the booting of platform, the extcon provider
126 	 * driver should notify cable state to upper layer.
127 	 */
128 	struct delayed_work wq_detcable;
129 
130 	/*
131 	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
132 	 * h/w path of COMP2/COMN1 on CONTROL1 register.
133 	 */
134 	int path_usb;
135 	int path_uart;
136 };
137 
138 static const unsigned int max8997_extcon_cable[] = {
139 	EXTCON_USB,
140 	EXTCON_USB_HOST,
141 	EXTCON_CHG_USB_SDP,
142 	EXTCON_CHG_USB_DCP,
143 	EXTCON_CHG_USB_FAST,
144 	EXTCON_CHG_USB_SLOW,
145 	EXTCON_CHG_USB_CDP,
146 	EXTCON_DISP_MHL,
147 	EXTCON_DOCK,
148 	EXTCON_JIG,
149 	EXTCON_NONE,
150 };
151 
152 /*
153  * max8997_muic_set_debounce_time - Set the debounce time of ADC
154  * @info: the instance including private data of max8997 MUIC
155  * @time: the debounce time of ADC
156  */
157 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
158 		enum max8997_muic_adc_debounce_time time)
159 {
160 	int ret;
161 
162 	switch (time) {
163 	case ADC_DEBOUNCE_TIME_0_5MS:
164 	case ADC_DEBOUNCE_TIME_10MS:
165 	case ADC_DEBOUNCE_TIME_25MS:
166 	case ADC_DEBOUNCE_TIME_38_62MS:
167 		ret = max8997_update_reg(info->muic,
168 					  MAX8997_MUIC_REG_CONTROL3,
169 					  time << CONTROL3_ADCDBSET_SHIFT,
170 					  CONTROL3_ADCDBSET_MASK);
171 		if (ret) {
172 			dev_err(info->dev, "failed to set ADC debounce time\n");
173 			return ret;
174 		}
175 		break;
176 	default:
177 		dev_err(info->dev, "invalid ADC debounce time\n");
178 		return -EINVAL;
179 	}
180 
181 	return 0;
182 };
183 
184 /*
185  * max8997_muic_set_path - Set hardware line according to attached cable
186  * @info: the instance including private data of max8997 MUIC
187  * @value: the path according to attached cable
188  * @attached: the state of cable (true:attached, false:detached)
189  *
190  * The max8997 MUIC device share outside H/W line among a varity of cables,
191  * so this function set internal path of H/W line according to the type of
192  * attached cable.
193  */
194 static int max8997_muic_set_path(struct max8997_muic_info *info,
195 		u8 val, bool attached)
196 {
197 	int ret;
198 	u8 ctrl1, ctrl2 = 0;
199 
200 	if (attached)
201 		ctrl1 = val;
202 	else
203 		ctrl1 = CONTROL1_SW_OPEN;
204 
205 	ret = max8997_update_reg(info->muic,
206 			MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
207 	if (ret < 0) {
208 		dev_err(info->dev, "failed to update MUIC register\n");
209 		return ret;
210 	}
211 
212 	if (attached)
213 		ctrl2 |= CONTROL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
214 	else
215 		ctrl2 |= CONTROL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */
216 
217 	ret = max8997_update_reg(info->muic,
218 			MAX8997_MUIC_REG_CONTROL2, ctrl2,
219 			CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
220 	if (ret < 0) {
221 		dev_err(info->dev, "failed to update MUIC register\n");
222 		return ret;
223 	}
224 
225 	dev_info(info->dev,
226 		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
227 		ctrl1, ctrl2, attached ? "attached" : "detached");
228 
229 	return 0;
230 }
231 
232 /*
233  * max8997_muic_get_cable_type - Return cable type and check cable state
234  * @info: the instance including private data of max8997 MUIC
235  * @group: the path according to attached cable
236  * @attached: store cable state and return
237  *
238  * This function check the cable state either attached or detached,
239  * and then divide precise type of cable according to cable group.
240  *	- MAX8997_CABLE_GROUP_ADC
241  *	- MAX8997_CABLE_GROUP_CHG
242  */
243 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
244 		enum max8997_muic_cable_group group, bool *attached)
245 {
246 	int cable_type = 0;
247 	int adc;
248 	int chg_type;
249 
250 	switch (group) {
251 	case MAX8997_CABLE_GROUP_ADC:
252 		/*
253 		 * Read ADC value to check cable type and decide cable state
254 		 * according to cable type
255 		 */
256 		adc = info->status[0] & STATUS1_ADC_MASK;
257 		adc >>= STATUS1_ADC_SHIFT;
258 
259 		/*
260 		 * Check current cable state/cable type and store cable type
261 		 * (info->prev_cable_type) for handling cable when cable is
262 		 * detached.
263 		 */
264 		if (adc == MAX8997_MUIC_ADC_OPEN) {
265 			*attached = false;
266 
267 			cable_type = info->prev_cable_type;
268 			info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
269 		} else {
270 			*attached = true;
271 
272 			cable_type = info->prev_cable_type = adc;
273 		}
274 		break;
275 	case MAX8997_CABLE_GROUP_CHG:
276 		/*
277 		 * Read charger type to check cable type and decide cable state
278 		 * according to type of charger cable.
279 		 */
280 		chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
281 		chg_type >>= STATUS2_CHGTYP_SHIFT;
282 
283 		if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
284 			*attached = false;
285 
286 			cable_type = info->prev_chg_type;
287 			info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
288 		} else {
289 			*attached = true;
290 
291 			/*
292 			 * Check current cable state/cable type and store cable
293 			 * type(info->prev_chg_type) for handling cable when
294 			 * charger cable is detached.
295 			 */
296 			cable_type = info->prev_chg_type = chg_type;
297 		}
298 
299 		break;
300 	default:
301 		dev_err(info->dev, "Unknown cable group (%d)\n", group);
302 		cable_type = -EINVAL;
303 		break;
304 	}
305 
306 	return cable_type;
307 }
308 
309 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
310 			enum max8997_muic_usb_type usb_type, bool attached)
311 {
312 	int ret = 0;
313 
314 	ret = max8997_muic_set_path(info, info->path_usb, attached);
315 	if (ret < 0) {
316 		dev_err(info->dev, "failed to update muic register\n");
317 		return ret;
318 	}
319 
320 	switch (usb_type) {
321 	case MAX8997_USB_HOST:
322 		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
323 		break;
324 	case MAX8997_USB_DEVICE:
325 		extcon_set_state_sync(info->edev, EXTCON_USB, attached);
326 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
327 					attached);
328 		break;
329 	default:
330 		dev_err(info->dev, "failed to detect %s usb cable\n",
331 			attached ? "attached" : "detached");
332 		return -EINVAL;
333 	}
334 
335 	return 0;
336 }
337 
338 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
339 			int cable_type, bool attached)
340 {
341 	int ret = 0;
342 
343 	ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
344 	if (ret) {
345 		dev_err(info->dev, "failed to update muic register\n");
346 		return ret;
347 	}
348 
349 	switch (cable_type) {
350 	case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
351 	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
352 		extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
353 		break;
354 	default:
355 		dev_err(info->dev, "failed to detect %s dock device\n",
356 			attached ? "attached" : "detached");
357 		return -EINVAL;
358 	}
359 
360 	return 0;
361 }
362 
363 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
364 			bool attached)
365 {
366 	int ret = 0;
367 
368 	/* switch to UART */
369 	ret = max8997_muic_set_path(info, info->path_uart, attached);
370 	if (ret) {
371 		dev_err(info->dev, "failed to update muic register\n");
372 		return ret;
373 	}
374 
375 	extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
376 
377 	return 0;
378 }
379 
380 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
381 {
382 	int cable_type;
383 	bool attached;
384 	int ret = 0;
385 
386 	/* Check cable state which is either detached or attached */
387 	cable_type = max8997_muic_get_cable_type(info,
388 				MAX8997_CABLE_GROUP_ADC, &attached);
389 
390 	switch (cable_type) {
391 	case MAX8997_MUIC_ADC_GROUND:
392 		ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
393 		if (ret < 0)
394 			return ret;
395 		break;
396 	case MAX8997_MUIC_ADC_MHL:
397 		extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
398 		break;
399 	case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
400 	case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
401 		ret = max8997_muic_handle_usb(info,
402 					     MAX8997_USB_DEVICE, attached);
403 		if (ret < 0)
404 			return ret;
405 		break;
406 	case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
407 	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
408 		ret = max8997_muic_handle_dock(info, cable_type, attached);
409 		if (ret < 0)
410 			return ret;
411 		break;
412 	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
413 		ret = max8997_muic_handle_jig_uart(info, attached);
414 		break;
415 	case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
416 	case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
417 	case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
418 	case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
419 	case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
420 	case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
421 	case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
422 	case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
423 	case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
424 	case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
425 	case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
426 	case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
427 	case MAX8997_MUIC_ADC_RESERVED_ACC_1:
428 	case MAX8997_MUIC_ADC_RESERVED_ACC_2:
429 	case MAX8997_MUIC_ADC_RESERVED_ACC_3:
430 	case MAX8997_MUIC_ADC_RESERVED_ACC_4:
431 	case MAX8997_MUIC_ADC_RESERVED_ACC_5:
432 	case MAX8997_MUIC_ADC_CEA936_AUDIO:
433 	case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
434 	case MAX8997_MUIC_ADC_TTY_CONVERTER:
435 	case MAX8997_MUIC_ADC_UART_CABLE:
436 	case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
437 	case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
438 	case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
439 		/*
440 		 * This cable isn't used in general case if it is specially
441 		 * needed to detect additional cable, should implement
442 		 * proper operation when this cable is attached/detached.
443 		 */
444 		dev_info(info->dev,
445 			"cable is %s but it isn't used (type:0x%x)\n",
446 			attached ? "attached" : "detached", cable_type);
447 		return -EAGAIN;
448 	default:
449 		dev_err(info->dev,
450 			"failed to detect %s unknown cable (type:0x%x)\n",
451 			attached ? "attached" : "detached", cable_type);
452 		return -EINVAL;
453 	}
454 
455 	return 0;
456 }
457 
458 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
459 {
460 	int chg_type;
461 	bool attached;
462 	int adc;
463 
464 	chg_type = max8997_muic_get_cable_type(info,
465 				MAX8997_CABLE_GROUP_CHG, &attached);
466 
467 	switch (chg_type) {
468 	case MAX8997_CHARGER_TYPE_NONE:
469 		break;
470 	case MAX8997_CHARGER_TYPE_USB:
471 		adc = info->status[0] & STATUS1_ADC_MASK;
472 		adc >>= STATUS1_ADC_SHIFT;
473 
474 		if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
475 			max8997_muic_handle_usb(info,
476 					MAX8997_USB_DEVICE, attached);
477 		}
478 		break;
479 	case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
480 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
481 					attached);
482 		break;
483 	case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
484 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
485 					attached);
486 		break;
487 	case MAX8997_CHARGER_TYPE_500MA:
488 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
489 					attached);
490 		break;
491 	case MAX8997_CHARGER_TYPE_1A:
492 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
493 					attached);
494 		break;
495 	default:
496 		dev_err(info->dev,
497 			"failed to detect %s unknown chg cable (type:0x%x)\n",
498 			attached ? "attached" : "detached", chg_type);
499 		return -EINVAL;
500 	}
501 
502 	return 0;
503 }
504 
505 static void max8997_muic_irq_work(struct work_struct *work)
506 {
507 	struct max8997_muic_info *info = container_of(work,
508 			struct max8997_muic_info, irq_work);
509 	int irq_type = 0;
510 	int i, ret;
511 
512 	if (!info->edev)
513 		return;
514 
515 	mutex_lock(&info->mutex);
516 
517 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
518 		if (info->irq == muic_irqs[i].virq)
519 			irq_type = muic_irqs[i].irq;
520 
521 	ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
522 				2, info->status);
523 	if (ret) {
524 		dev_err(info->dev, "failed to read muic register\n");
525 		mutex_unlock(&info->mutex);
526 		return;
527 	}
528 
529 	switch (irq_type) {
530 	case MAX8997_MUICIRQ_ADCError:
531 	case MAX8997_MUICIRQ_ADCLow:
532 	case MAX8997_MUICIRQ_ADC:
533 		/* Handle all of cable except for charger cable */
534 		ret = max8997_muic_adc_handler(info);
535 		break;
536 	case MAX8997_MUICIRQ_VBVolt:
537 	case MAX8997_MUICIRQ_DBChg:
538 	case MAX8997_MUICIRQ_DCDTmr:
539 	case MAX8997_MUICIRQ_ChgDetRun:
540 	case MAX8997_MUICIRQ_ChgTyp:
541 		/* Handle charger cable */
542 		ret = max8997_muic_chg_handler(info);
543 		break;
544 	case MAX8997_MUICIRQ_OVP:
545 		break;
546 	default:
547 		dev_info(info->dev, "misc interrupt: irq %d occurred\n",
548 				irq_type);
549 		mutex_unlock(&info->mutex);
550 		return;
551 	}
552 
553 	if (ret < 0)
554 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
555 
556 	mutex_unlock(&info->mutex);
557 }
558 
559 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
560 {
561 	struct max8997_muic_info *info = data;
562 
563 	dev_dbg(info->dev, "irq:%d\n", irq);
564 	info->irq = irq;
565 
566 	schedule_work(&info->irq_work);
567 
568 	return IRQ_HANDLED;
569 }
570 
571 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
572 {
573 	int ret = 0;
574 	int adc;
575 	int chg_type;
576 	bool attached;
577 
578 	mutex_lock(&info->mutex);
579 
580 	/* Read STATUSx register to detect accessory */
581 	ret = max8997_bulk_read(info->muic,
582 			MAX8997_MUIC_REG_STATUS1, 2, info->status);
583 	if (ret) {
584 		dev_err(info->dev, "failed to read MUIC register\n");
585 		mutex_unlock(&info->mutex);
586 		return ret;
587 	}
588 
589 	adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
590 					&attached);
591 	if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
592 		ret = max8997_muic_adc_handler(info);
593 		if (ret < 0) {
594 			dev_err(info->dev, "Cannot detect ADC cable\n");
595 			mutex_unlock(&info->mutex);
596 			return ret;
597 		}
598 	}
599 
600 	chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
601 					&attached);
602 	if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
603 		ret = max8997_muic_chg_handler(info);
604 		if (ret < 0) {
605 			dev_err(info->dev, "Cannot detect charger cable\n");
606 			mutex_unlock(&info->mutex);
607 			return ret;
608 		}
609 	}
610 
611 	mutex_unlock(&info->mutex);
612 
613 	return 0;
614 }
615 
616 static void max8997_muic_detect_cable_wq(struct work_struct *work)
617 {
618 	struct max8997_muic_info *info = container_of(to_delayed_work(work),
619 				struct max8997_muic_info, wq_detcable);
620 	int ret;
621 
622 	ret = max8997_muic_detect_dev(info);
623 	if (ret < 0)
624 		dev_err(info->dev, "failed to detect cable type\n");
625 }
626 
627 static int max8997_muic_probe(struct platform_device *pdev)
628 {
629 	struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
630 	struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
631 	struct max8997_muic_info *info;
632 	int delay_jiffies;
633 	int cable_type;
634 	bool attached;
635 	int ret, i;
636 
637 	info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
638 			    GFP_KERNEL);
639 	if (!info)
640 		return -ENOMEM;
641 
642 	info->dev = &pdev->dev;
643 	info->muic = max8997->muic;
644 
645 	platform_set_drvdata(pdev, info);
646 	mutex_init(&info->mutex);
647 
648 	INIT_WORK(&info->irq_work, max8997_muic_irq_work);
649 
650 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
651 		struct max8997_muic_irq *muic_irq = &muic_irqs[i];
652 		unsigned int virq = 0;
653 
654 		virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
655 		if (!virq) {
656 			ret = -EINVAL;
657 			goto err_irq;
658 		}
659 		muic_irq->virq = virq;
660 
661 		ret = request_threaded_irq(virq, NULL,
662 				max8997_muic_irq_handler,
663 				IRQF_NO_SUSPEND,
664 				muic_irq->name, info);
665 		if (ret) {
666 			dev_err(&pdev->dev,
667 				"failed: irq request (IRQ: %d, error :%d)\n",
668 				muic_irq->irq, ret);
669 			goto err_irq;
670 		}
671 	}
672 
673 	/* External connector */
674 	info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
675 	if (IS_ERR(info->edev)) {
676 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
677 		ret = -ENOMEM;
678 		goto err_irq;
679 	}
680 
681 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
682 	if (ret) {
683 		dev_err(&pdev->dev, "failed to register extcon device\n");
684 		goto err_irq;
685 	}
686 
687 	if (pdata && pdata->muic_pdata) {
688 		struct max8997_muic_platform_data *muic_pdata
689 			= pdata->muic_pdata;
690 
691 		/* Initialize registers according to platform data */
692 		for (i = 0; i < muic_pdata->num_init_data; i++) {
693 			max8997_write_reg(info->muic,
694 					muic_pdata->init_data[i].addr,
695 					muic_pdata->init_data[i].data);
696 		}
697 
698 		/*
699 		 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
700 		 * h/w path of COMP2/COMN1 on CONTROL1 register.
701 		 */
702 		if (muic_pdata->path_uart)
703 			info->path_uart = muic_pdata->path_uart;
704 		else
705 			info->path_uart = CONTROL1_SW_UART;
706 
707 		if (muic_pdata->path_usb)
708 			info->path_usb = muic_pdata->path_usb;
709 		else
710 			info->path_usb = CONTROL1_SW_USB;
711 
712 		/*
713 		 * Default delay time for detecting cable state
714 		 * after certain time.
715 		 */
716 		if (muic_pdata->detcable_delay_ms)
717 			delay_jiffies =
718 				msecs_to_jiffies(muic_pdata->detcable_delay_ms);
719 		else
720 			delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
721 	} else {
722 		info->path_uart = CONTROL1_SW_UART;
723 		info->path_usb = CONTROL1_SW_USB;
724 		delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
725 	}
726 
727 	/* Set initial path for UART when JIG is connected to get serial logs */
728 	ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
729 				2, info->status);
730 	if (ret) {
731 		dev_err(info->dev, "failed to read MUIC register\n");
732 		return ret;
733 	}
734 	cable_type = max8997_muic_get_cable_type(info,
735 					   MAX8997_CABLE_GROUP_ADC, &attached);
736 	if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF)
737 		max8997_muic_set_path(info, info->path_uart, true);
738 
739 	/* Set ADC debounce time */
740 	max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
741 
742 	/*
743 	 * Detect accessory after completing the initialization of platform
744 	 *
745 	 * - Use delayed workqueue to detect cable state and then
746 	 * notify cable state to notifiee/platform through uevent.
747 	 * After completing the booting of platform, the extcon provider
748 	 * driver should notify cable state to upper layer.
749 	 */
750 	INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
751 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
752 			delay_jiffies);
753 
754 	return 0;
755 
756 err_irq:
757 	while (--i >= 0)
758 		free_irq(muic_irqs[i].virq, info);
759 	return ret;
760 }
761 
762 static int max8997_muic_remove(struct platform_device *pdev)
763 {
764 	struct max8997_muic_info *info = platform_get_drvdata(pdev);
765 	int i;
766 
767 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
768 		free_irq(muic_irqs[i].virq, info);
769 	cancel_work_sync(&info->irq_work);
770 
771 	return 0;
772 }
773 
774 static struct platform_driver max8997_muic_driver = {
775 	.driver		= {
776 		.name	= DEV_NAME,
777 	},
778 	.probe		= max8997_muic_probe,
779 	.remove		= max8997_muic_remove,
780 };
781 
782 module_platform_driver(max8997_muic_driver);
783 
784 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
785 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
786 MODULE_LICENSE("GPL");
787