1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
4 //
5 // Copyright (C) 2013,2014 Samsung Electronics
6 // Chanwoo Choi <cw00.choi@samsung.com>
7 // Krzysztof Kozlowski <krzk@kernel.org>
8 
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/i2c.h>
12 #include <linux/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/mfd/max14577.h>
15 #include <linux/mfd/max14577-private.h>
16 #include <linux/extcon-provider.h>
17 
18 #define	DELAY_MS_DEFAULT		17000		/* unit: millisecond */
19 
20 enum max14577_muic_adc_debounce_time {
21 	ADC_DEBOUNCE_TIME_5MS = 0,
22 	ADC_DEBOUNCE_TIME_10MS,
23 	ADC_DEBOUNCE_TIME_25MS,
24 	ADC_DEBOUNCE_TIME_38_62MS,
25 };
26 
27 enum max14577_muic_status {
28 	MAX14577_MUIC_STATUS1 = 0,
29 	MAX14577_MUIC_STATUS2 = 1,
30 	MAX14577_MUIC_STATUS_END,
31 };
32 
33 /**
34  * struct max14577_muic_irq
35  * @irq: the index of irq list of MUIC device.
36  * @name: the name of irq.
37  * @virq: the virtual irq to use irq domain
38  */
39 struct max14577_muic_irq {
40 	unsigned int irq;
41 	const char *name;
42 	unsigned int virq;
43 };
44 
45 static struct max14577_muic_irq max14577_muic_irqs[] = {
46 	{ MAX14577_IRQ_INT1_ADC,	"muic-ADC" },
47 	{ MAX14577_IRQ_INT1_ADCLOW,	"muic-ADCLOW" },
48 	{ MAX14577_IRQ_INT1_ADCERR,	"muic-ADCError" },
49 	{ MAX14577_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
50 	{ MAX14577_IRQ_INT2_CHGDETRUN,	"muic-CHGDETRUN" },
51 	{ MAX14577_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
52 	{ MAX14577_IRQ_INT2_DBCHG,	"muic-DBCHG" },
53 	{ MAX14577_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
54 };
55 
56 static struct max14577_muic_irq max77836_muic_irqs[] = {
57 	{ MAX14577_IRQ_INT1_ADC,	"muic-ADC" },
58 	{ MAX14577_IRQ_INT1_ADCLOW,	"muic-ADCLOW" },
59 	{ MAX14577_IRQ_INT1_ADCERR,	"muic-ADCError" },
60 	{ MAX77836_IRQ_INT1_ADC1K,	"muic-ADC1K" },
61 	{ MAX14577_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
62 	{ MAX14577_IRQ_INT2_CHGDETRUN,	"muic-CHGDETRUN" },
63 	{ MAX14577_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
64 	{ MAX14577_IRQ_INT2_DBCHG,	"muic-DBCHG" },
65 	{ MAX14577_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
66 	{ MAX77836_IRQ_INT2_VIDRM,	"muic-VIDRM" },
67 };
68 
69 struct max14577_muic_info {
70 	struct device *dev;
71 	struct max14577 *max14577;
72 	struct extcon_dev *edev;
73 	int prev_cable_type;
74 	int prev_chg_type;
75 	u8 status[MAX14577_MUIC_STATUS_END];
76 
77 	struct max14577_muic_irq *muic_irqs;
78 	unsigned int muic_irqs_num;
79 	bool irq_adc;
80 	bool irq_chg;
81 	struct work_struct irq_work;
82 	struct mutex mutex;
83 
84 	/*
85 	 * Use delayed workqueue to detect cable state and then
86 	 * notify cable state to notifiee/platform through uevent.
87 	 * After completing the booting of platform, the extcon provider
88 	 * driver should notify cable state to upper layer.
89 	 */
90 	struct delayed_work wq_detcable;
91 
92 	/*
93 	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
94 	 * h/w path of COMP2/COMN1 on CONTROL1 register.
95 	 */
96 	int path_usb;
97 	int path_uart;
98 };
99 
100 enum max14577_muic_cable_group {
101 	MAX14577_CABLE_GROUP_ADC = 0,
102 	MAX14577_CABLE_GROUP_CHG,
103 };
104 
105 /* Define supported accessory type */
106 enum max14577_muic_acc_type {
107 	MAX14577_MUIC_ADC_GROUND = 0x0,
108 	MAX14577_MUIC_ADC_SEND_END_BUTTON,
109 	MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
110 	MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
111 	MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
112 	MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
113 	MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
114 	MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
115 	MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
116 	MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
117 	MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
118 	MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
119 	MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
120 	MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
121 	MAX14577_MUIC_ADC_RESERVED_ACC_1,
122 	MAX14577_MUIC_ADC_RESERVED_ACC_2,
123 	MAX14577_MUIC_ADC_RESERVED_ACC_3,
124 	MAX14577_MUIC_ADC_RESERVED_ACC_4,
125 	MAX14577_MUIC_ADC_RESERVED_ACC_5,
126 	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
127 	MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
128 	MAX14577_MUIC_ADC_TTY_CONVERTER,
129 	MAX14577_MUIC_ADC_UART_CABLE,
130 	MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
131 	MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
132 	MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
133 	MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
134 	MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
135 	MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
136 	MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
137 	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
138 	MAX14577_MUIC_ADC_OPEN,
139 };
140 
141 static const unsigned int max14577_extcon_cable[] = {
142 	EXTCON_USB,
143 	EXTCON_CHG_USB_SDP,
144 	EXTCON_CHG_USB_DCP,
145 	EXTCON_CHG_USB_FAST,
146 	EXTCON_CHG_USB_SLOW,
147 	EXTCON_CHG_USB_CDP,
148 	EXTCON_JIG,
149 	EXTCON_NONE,
150 };
151 
152 /*
153  * max14577_muic_set_debounce_time - Set the debounce time of ADC
154  * @info: the instance including private data of max14577 MUIC
155  * @time: the debounce time of ADC
156  */
157 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
158 		enum max14577_muic_adc_debounce_time time)
159 {
160 	u8 ret;
161 
162 	switch (time) {
163 	case ADC_DEBOUNCE_TIME_5MS:
164 	case ADC_DEBOUNCE_TIME_10MS:
165 	case ADC_DEBOUNCE_TIME_25MS:
166 	case ADC_DEBOUNCE_TIME_38_62MS:
167 		ret = max14577_update_reg(info->max14577->regmap,
168 					  MAX14577_MUIC_REG_CONTROL3,
169 					  CTRL3_ADCDBSET_MASK,
170 					  time << CTRL3_ADCDBSET_SHIFT);
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  * max14577_muic_set_path - Set hardware line according to attached cable
186  * @info: the instance including private data of max14577 MUIC
187  * @value: the path according to attached cable
188  * @attached: the state of cable (true:attached, false:detached)
189  *
190  * The max14577 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 max14577_muic_set_path(struct max14577_muic_info *info,
195 		u8 val, bool attached)
196 {
197 	u8 ctrl1, ctrl2 = 0;
198 	int ret;
199 
200 	/* Set open state to path before changing hw path */
201 	ret = max14577_update_reg(info->max14577->regmap,
202 				MAX14577_MUIC_REG_CONTROL1,
203 				CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
204 	if (ret < 0) {
205 		dev_err(info->dev, "failed to update MUIC register\n");
206 		return ret;
207 	}
208 
209 	if (attached)
210 		ctrl1 = val;
211 	else
212 		ctrl1 = CTRL1_SW_OPEN;
213 
214 	ret = max14577_update_reg(info->max14577->regmap,
215 				MAX14577_MUIC_REG_CONTROL1,
216 				CLEAR_IDBEN_MICEN_MASK, ctrl1);
217 	if (ret < 0) {
218 		dev_err(info->dev, "failed to update MUIC register\n");
219 		return ret;
220 	}
221 
222 	if (attached)
223 		ctrl2 |= CTRL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
224 	else
225 		ctrl2 |= CTRL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */
226 
227 	ret = max14577_update_reg(info->max14577->regmap,
228 			MAX14577_REG_CONTROL2,
229 			CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
230 	if (ret < 0) {
231 		dev_err(info->dev, "failed to update MUIC register\n");
232 		return ret;
233 	}
234 
235 	dev_dbg(info->dev,
236 		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
237 		ctrl1, ctrl2, attached ? "attached" : "detached");
238 
239 	return 0;
240 }
241 
242 /*
243  * max14577_muic_get_cable_type - Return cable type and check cable state
244  * @info: the instance including private data of max14577 MUIC
245  * @group: the path according to attached cable
246  * @attached: store cable state and return
247  *
248  * This function check the cable state either attached or detached,
249  * and then divide precise type of cable according to cable group.
250  *	- max14577_CABLE_GROUP_ADC
251  *	- max14577_CABLE_GROUP_CHG
252  */
253 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
254 		enum max14577_muic_cable_group group, bool *attached)
255 {
256 	int cable_type = 0;
257 	int adc;
258 	int chg_type;
259 
260 	switch (group) {
261 	case MAX14577_CABLE_GROUP_ADC:
262 		/*
263 		 * Read ADC value to check cable type and decide cable state
264 		 * according to cable type
265 		 */
266 		adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
267 		adc >>= STATUS1_ADC_SHIFT;
268 
269 		/*
270 		 * Check current cable state/cable type and store cable type
271 		 * (info->prev_cable_type) for handling cable when cable is
272 		 * detached.
273 		 */
274 		if (adc == MAX14577_MUIC_ADC_OPEN) {
275 			*attached = false;
276 
277 			cable_type = info->prev_cable_type;
278 			info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
279 		} else {
280 			*attached = true;
281 
282 			cable_type = info->prev_cable_type = adc;
283 		}
284 		break;
285 	case MAX14577_CABLE_GROUP_CHG:
286 		/*
287 		 * Read charger type to check cable type and decide cable state
288 		 * according to type of charger cable.
289 		 */
290 		chg_type = info->status[MAX14577_MUIC_STATUS2] &
291 			STATUS2_CHGTYP_MASK;
292 		chg_type >>= STATUS2_CHGTYP_SHIFT;
293 
294 		if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
295 			*attached = false;
296 
297 			cable_type = info->prev_chg_type;
298 			info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
299 		} else {
300 			*attached = true;
301 
302 			/*
303 			 * Check current cable state/cable type and store cable
304 			 * type(info->prev_chg_type) for handling cable when
305 			 * charger cable is detached.
306 			 */
307 			cable_type = info->prev_chg_type = chg_type;
308 		}
309 
310 		break;
311 	default:
312 		dev_err(info->dev, "Unknown cable group (%d)\n", group);
313 		cable_type = -EINVAL;
314 		break;
315 	}
316 
317 	return cable_type;
318 }
319 
320 static int max14577_muic_jig_handler(struct max14577_muic_info *info,
321 		int cable_type, bool attached)
322 {
323 	int ret = 0;
324 	u8 path = CTRL1_SW_OPEN;
325 
326 	dev_dbg(info->dev,
327 		"external connector is %s (adc:0x%02x)\n",
328 		attached ? "attached" : "detached", cable_type);
329 
330 	switch (cable_type) {
331 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:	/* ADC_JIG_USB_OFF */
332 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:	/* ADC_JIG_USB_ON */
333 		/* PATH:AP_USB */
334 		path = CTRL1_SW_USB;
335 		break;
336 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:	/* ADC_JIG_UART_OFF */
337 		/* PATH:AP_UART */
338 		path = CTRL1_SW_UART;
339 		break;
340 	default:
341 		dev_err(info->dev, "failed to detect %s jig cable\n",
342 			attached ? "attached" : "detached");
343 		return -EINVAL;
344 	}
345 
346 	ret = max14577_muic_set_path(info, path, attached);
347 	if (ret < 0)
348 		return ret;
349 
350 	extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
351 
352 	return 0;
353 }
354 
355 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
356 {
357 	int cable_type;
358 	bool attached;
359 	int ret = 0;
360 
361 	/* Check accessory state which is either detached or attached */
362 	cable_type = max14577_muic_get_cable_type(info,
363 				MAX14577_CABLE_GROUP_ADC, &attached);
364 
365 	dev_dbg(info->dev,
366 		"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
367 		attached ? "attached" : "detached", cable_type,
368 		info->prev_cable_type);
369 
370 	switch (cable_type) {
371 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
372 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
373 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
374 		/* JIG */
375 		ret = max14577_muic_jig_handler(info, cable_type, attached);
376 		if (ret < 0)
377 			return ret;
378 		break;
379 	case MAX14577_MUIC_ADC_GROUND:
380 	case MAX14577_MUIC_ADC_SEND_END_BUTTON:
381 	case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
382 	case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
383 	case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
384 	case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
385 	case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
386 	case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
387 	case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
388 	case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
389 	case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
390 	case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
391 	case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
392 	case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
393 	case MAX14577_MUIC_ADC_RESERVED_ACC_1:
394 	case MAX14577_MUIC_ADC_RESERVED_ACC_2:
395 	case MAX14577_MUIC_ADC_RESERVED_ACC_3:
396 	case MAX14577_MUIC_ADC_RESERVED_ACC_4:
397 	case MAX14577_MUIC_ADC_RESERVED_ACC_5:
398 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
399 	case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
400 	case MAX14577_MUIC_ADC_TTY_CONVERTER:
401 	case MAX14577_MUIC_ADC_UART_CABLE:
402 	case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
403 	case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
404 	case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
405 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
406 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
407 		/*
408 		 * This accessory isn't used in general case if it is specially
409 		 * needed to detect additional accessory, should implement
410 		 * proper operation when this accessory is attached/detached.
411 		 */
412 		dev_info(info->dev,
413 			"accessory is %s but it isn't used (adc:0x%x)\n",
414 			attached ? "attached" : "detached", cable_type);
415 		return -EAGAIN;
416 	default:
417 		dev_err(info->dev,
418 			"failed to detect %s accessory (adc:0x%x)\n",
419 			attached ? "attached" : "detached", cable_type);
420 		return -EINVAL;
421 	}
422 
423 	return 0;
424 }
425 
426 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
427 {
428 	int chg_type;
429 	bool attached;
430 	int ret = 0;
431 
432 	chg_type = max14577_muic_get_cable_type(info,
433 				MAX14577_CABLE_GROUP_CHG, &attached);
434 
435 	dev_dbg(info->dev,
436 		"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
437 			attached ? "attached" : "detached",
438 			chg_type, info->prev_chg_type);
439 
440 	switch (chg_type) {
441 	case MAX14577_CHARGER_TYPE_USB:
442 		/* PATH:AP_USB */
443 		ret = max14577_muic_set_path(info, info->path_usb, attached);
444 		if (ret < 0)
445 			return ret;
446 
447 		extcon_set_state_sync(info->edev, EXTCON_USB, attached);
448 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
449 					attached);
450 		break;
451 	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
452 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
453 					attached);
454 		break;
455 	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
456 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
457 					attached);
458 		break;
459 	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
460 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
461 					attached);
462 		break;
463 	case MAX14577_CHARGER_TYPE_SPECIAL_1A:
464 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
465 					attached);
466 		break;
467 	case MAX14577_CHARGER_TYPE_NONE:
468 	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
469 		break;
470 	default:
471 		dev_err(info->dev,
472 			"failed to detect %s accessory (chg_type:0x%x)\n",
473 			attached ? "attached" : "detached", chg_type);
474 		return -EINVAL;
475 	}
476 
477 	return 0;
478 }
479 
480 static void max14577_muic_irq_work(struct work_struct *work)
481 {
482 	struct max14577_muic_info *info = container_of(work,
483 			struct max14577_muic_info, irq_work);
484 	int ret = 0;
485 
486 	if (!info->edev)
487 		return;
488 
489 	mutex_lock(&info->mutex);
490 
491 	ret = max14577_bulk_read(info->max14577->regmap,
492 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
493 	if (ret) {
494 		dev_err(info->dev, "failed to read MUIC register\n");
495 		mutex_unlock(&info->mutex);
496 		return;
497 	}
498 
499 	if (info->irq_adc) {
500 		ret = max14577_muic_adc_handler(info);
501 		info->irq_adc = false;
502 	}
503 	if (info->irq_chg) {
504 		ret = max14577_muic_chg_handler(info);
505 		info->irq_chg = false;
506 	}
507 
508 	if (ret < 0)
509 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
510 
511 	mutex_unlock(&info->mutex);
512 }
513 
514 /*
515  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
516  * Returns 0 if irq_type does not match registered IRQ for this device type.
517  */
518 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
519 {
520 	switch (irq_type) {
521 	case MAX14577_IRQ_INT1_ADC:
522 	case MAX14577_IRQ_INT1_ADCLOW:
523 	case MAX14577_IRQ_INT1_ADCERR:
524 		/*
525 		 * Handle all of accessory except for
526 		 * type of charger accessory.
527 		 */
528 		info->irq_adc = true;
529 		return 1;
530 	case MAX14577_IRQ_INT2_CHGTYP:
531 	case MAX14577_IRQ_INT2_CHGDETRUN:
532 	case MAX14577_IRQ_INT2_DCDTMR:
533 	case MAX14577_IRQ_INT2_DBCHG:
534 	case MAX14577_IRQ_INT2_VBVOLT:
535 		/* Handle charger accessory */
536 		info->irq_chg = true;
537 		return 1;
538 	default:
539 		return 0;
540 	}
541 }
542 
543 /*
544  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
545  * Returns 0 if irq_type does not match registered IRQ for this device type.
546  */
547 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
548 {
549 	/* First check common max14577 interrupts */
550 	if (max14577_parse_irq(info, irq_type))
551 		return 1;
552 
553 	switch (irq_type) {
554 	case MAX77836_IRQ_INT1_ADC1K:
555 		info->irq_adc = true;
556 		return 1;
557 	case MAX77836_IRQ_INT2_VIDRM:
558 		/* Handle charger accessory */
559 		info->irq_chg = true;
560 		return 1;
561 	default:
562 		return 0;
563 	}
564 }
565 
566 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
567 {
568 	struct max14577_muic_info *info = data;
569 	int i, irq_type = -1;
570 	bool irq_parsed;
571 
572 	/*
573 	 * We may be called multiple times for different nested IRQ-s.
574 	 * Including changes in INT1_ADC and INT2_CGHTYP at once.
575 	 * However we only need to know whether it was ADC, charger
576 	 * or both interrupts so decode IRQ and turn on proper flags.
577 	 */
578 	for (i = 0; i < info->muic_irqs_num; i++)
579 		if (irq == info->muic_irqs[i].virq)
580 			irq_type = info->muic_irqs[i].irq;
581 
582 	switch (info->max14577->dev_type) {
583 	case MAXIM_DEVICE_TYPE_MAX77836:
584 		irq_parsed = max77836_parse_irq(info, irq_type);
585 		break;
586 	case MAXIM_DEVICE_TYPE_MAX14577:
587 	default:
588 		irq_parsed = max14577_parse_irq(info, irq_type);
589 		break;
590 	}
591 
592 	if (!irq_parsed) {
593 		dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
594 				irq_type);
595 		return IRQ_HANDLED;
596 	}
597 	schedule_work(&info->irq_work);
598 
599 	return IRQ_HANDLED;
600 }
601 
602 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
603 {
604 	int ret = 0;
605 	int adc;
606 	int chg_type;
607 	bool attached;
608 
609 	mutex_lock(&info->mutex);
610 
611 	/* Read STATUSx register to detect accessory */
612 	ret = max14577_bulk_read(info->max14577->regmap,
613 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
614 	if (ret) {
615 		dev_err(info->dev, "failed to read MUIC register\n");
616 		mutex_unlock(&info->mutex);
617 		return ret;
618 	}
619 
620 	adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
621 					&attached);
622 	if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
623 		ret = max14577_muic_adc_handler(info);
624 		if (ret < 0) {
625 			dev_err(info->dev, "Cannot detect accessory\n");
626 			mutex_unlock(&info->mutex);
627 			return ret;
628 		}
629 	}
630 
631 	chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
632 					&attached);
633 	if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
634 		ret = max14577_muic_chg_handler(info);
635 		if (ret < 0) {
636 			dev_err(info->dev, "Cannot detect charger accessory\n");
637 			mutex_unlock(&info->mutex);
638 			return ret;
639 		}
640 	}
641 
642 	mutex_unlock(&info->mutex);
643 
644 	return 0;
645 }
646 
647 static void max14577_muic_detect_cable_wq(struct work_struct *work)
648 {
649 	struct max14577_muic_info *info = container_of(to_delayed_work(work),
650 				struct max14577_muic_info, wq_detcable);
651 
652 	max14577_muic_detect_accessory(info);
653 }
654 
655 static int max14577_muic_probe(struct platform_device *pdev)
656 {
657 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
658 	struct max14577_muic_info *info;
659 	int delay_jiffies;
660 	int ret;
661 	int i;
662 	u8 id;
663 
664 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
665 	if (!info)
666 		return -ENOMEM;
667 
668 	info->dev = &pdev->dev;
669 	info->max14577 = max14577;
670 
671 	platform_set_drvdata(pdev, info);
672 	mutex_init(&info->mutex);
673 
674 	INIT_WORK(&info->irq_work, max14577_muic_irq_work);
675 
676 	switch (max14577->dev_type) {
677 	case MAXIM_DEVICE_TYPE_MAX77836:
678 		info->muic_irqs = max77836_muic_irqs;
679 		info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
680 		break;
681 	case MAXIM_DEVICE_TYPE_MAX14577:
682 	default:
683 		info->muic_irqs = max14577_muic_irqs;
684 		info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
685 	}
686 
687 	/* Support irq domain for max14577 MUIC device */
688 	for (i = 0; i < info->muic_irqs_num; i++) {
689 		struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
690 		int virq = 0;
691 
692 		virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
693 		if (virq <= 0)
694 			return -EINVAL;
695 		muic_irq->virq = virq;
696 
697 		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
698 				max14577_muic_irq_handler,
699 				IRQF_NO_SUSPEND,
700 				muic_irq->name, info);
701 		if (ret) {
702 			dev_err(&pdev->dev,
703 				"failed: irq request (IRQ: %d, error :%d)\n",
704 				muic_irq->irq, ret);
705 			return ret;
706 		}
707 	}
708 
709 	/* Initialize extcon device */
710 	info->edev = devm_extcon_dev_allocate(&pdev->dev,
711 					      max14577_extcon_cable);
712 	if (IS_ERR(info->edev)) {
713 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
714 		return -ENOMEM;
715 	}
716 
717 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
718 	if (ret) {
719 		dev_err(&pdev->dev, "failed to register extcon device\n");
720 		return ret;
721 	}
722 
723 	/* Default h/w line path */
724 	info->path_usb = CTRL1_SW_USB;
725 	info->path_uart = CTRL1_SW_UART;
726 	delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
727 
728 	/* Set initial path for UART */
729 	max14577_muic_set_path(info, info->path_uart, true);
730 
731 	/* Check revision number of MUIC device*/
732 	ret = max14577_read_reg(info->max14577->regmap,
733 			MAX14577_REG_DEVICEID, &id);
734 	if (ret < 0) {
735 		dev_err(&pdev->dev, "failed to read revision number\n");
736 		return ret;
737 	}
738 	dev_info(info->dev, "device ID : 0x%x\n", id);
739 
740 	/* Set ADC debounce time */
741 	max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
742 
743 	/*
744 	 * Detect accessory after completing the initialization of platform
745 	 *
746 	 * - Use delayed workqueue to detect cable state and then
747 	 * notify cable state to notifiee/platform through uevent.
748 	 * After completing the booting of platform, the extcon provider
749 	 * driver should notify cable state to upper layer.
750 	 */
751 	INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
752 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
753 			delay_jiffies);
754 
755 	return ret;
756 }
757 
758 static int max14577_muic_remove(struct platform_device *pdev)
759 {
760 	struct max14577_muic_info *info = platform_get_drvdata(pdev);
761 
762 	cancel_work_sync(&info->irq_work);
763 
764 	return 0;
765 }
766 
767 static const struct platform_device_id max14577_muic_id[] = {
768 	{ "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
769 	{ "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
770 	{ }
771 };
772 MODULE_DEVICE_TABLE(platform, max14577_muic_id);
773 
774 static struct platform_driver max14577_muic_driver = {
775 	.driver		= {
776 		.name	= "max14577-muic",
777 	},
778 	.probe		= max14577_muic_probe,
779 	.remove		= max14577_muic_remove,
780 	.id_table	= max14577_muic_id,
781 };
782 
783 module_platform_driver(max14577_muic_driver);
784 
785 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
786 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
787 MODULE_LICENSE("GPL");
788 MODULE_ALIAS("platform:extcon-max14577");
789