1 /*
2  * extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
3  *
4  * Copyright (C) 2013,2014 Samsung Electronics
5  * Chanwoo Choi <cw00.choi@samsung.com>
6  * Krzysztof Kozlowski <k.kozlowski@samsung.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  */
18 
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/i2c.h>
22 #include <linux/interrupt.h>
23 #include <linux/platform_device.h>
24 #include <linux/mfd/max14577.h>
25 #include <linux/mfd/max14577-private.h>
26 #include <linux/extcon.h>
27 
28 #define	DELAY_MS_DEFAULT		17000		/* unit: millisecond */
29 
30 enum max14577_muic_adc_debounce_time {
31 	ADC_DEBOUNCE_TIME_5MS = 0,
32 	ADC_DEBOUNCE_TIME_10MS,
33 	ADC_DEBOUNCE_TIME_25MS,
34 	ADC_DEBOUNCE_TIME_38_62MS,
35 };
36 
37 enum max14577_muic_status {
38 	MAX14577_MUIC_STATUS1 = 0,
39 	MAX14577_MUIC_STATUS2 = 1,
40 	MAX14577_MUIC_STATUS_END,
41 };
42 
43 /**
44  * struct max14577_muic_irq
45  * @irq: the index of irq list of MUIC device.
46  * @name: the name of irq.
47  * @virq: the virtual irq to use irq domain
48  */
49 struct max14577_muic_irq {
50 	unsigned int irq;
51 	const char *name;
52 	unsigned int virq;
53 };
54 
55 static struct max14577_muic_irq max14577_muic_irqs[] = {
56 	{ MAX14577_IRQ_INT1_ADC,	"muic-ADC" },
57 	{ MAX14577_IRQ_INT1_ADCLOW,	"muic-ADCLOW" },
58 	{ MAX14577_IRQ_INT1_ADCERR,	"muic-ADCError" },
59 	{ MAX14577_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
60 	{ MAX14577_IRQ_INT2_CHGDETRUN,	"muic-CHGDETRUN" },
61 	{ MAX14577_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
62 	{ MAX14577_IRQ_INT2_DBCHG,	"muic-DBCHG" },
63 	{ MAX14577_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
64 };
65 
66 static struct max14577_muic_irq max77836_muic_irqs[] = {
67 	{ MAX14577_IRQ_INT1_ADC,	"muic-ADC" },
68 	{ MAX14577_IRQ_INT1_ADCLOW,	"muic-ADCLOW" },
69 	{ MAX14577_IRQ_INT1_ADCERR,	"muic-ADCError" },
70 	{ MAX77836_IRQ_INT1_ADC1K,	"muic-ADC1K" },
71 	{ MAX14577_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
72 	{ MAX14577_IRQ_INT2_CHGDETRUN,	"muic-CHGDETRUN" },
73 	{ MAX14577_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
74 	{ MAX14577_IRQ_INT2_DBCHG,	"muic-DBCHG" },
75 	{ MAX14577_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
76 	{ MAX77836_IRQ_INT2_VIDRM,	"muic-VIDRM" },
77 };
78 
79 struct max14577_muic_info {
80 	struct device *dev;
81 	struct max14577 *max14577;
82 	struct extcon_dev *edev;
83 	int prev_cable_type;
84 	int prev_chg_type;
85 	u8 status[MAX14577_MUIC_STATUS_END];
86 
87 	struct max14577_muic_irq *muic_irqs;
88 	unsigned int muic_irqs_num;
89 	bool irq_adc;
90 	bool irq_chg;
91 	struct work_struct irq_work;
92 	struct mutex mutex;
93 
94 	/*
95 	 * Use delayed workqueue to detect cable state and then
96 	 * notify cable state to notifiee/platform through uevent.
97 	 * After completing the booting of platform, the extcon provider
98 	 * driver should notify cable state to upper layer.
99 	 */
100 	struct delayed_work wq_detcable;
101 
102 	/*
103 	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
104 	 * h/w path of COMP2/COMN1 on CONTROL1 register.
105 	 */
106 	int path_usb;
107 	int path_uart;
108 };
109 
110 enum max14577_muic_cable_group {
111 	MAX14577_CABLE_GROUP_ADC = 0,
112 	MAX14577_CABLE_GROUP_CHG,
113 };
114 
115 /* Define supported accessory type */
116 enum max14577_muic_acc_type {
117 	MAX14577_MUIC_ADC_GROUND = 0x0,
118 	MAX14577_MUIC_ADC_SEND_END_BUTTON,
119 	MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
120 	MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
121 	MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
122 	MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
123 	MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
124 	MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
125 	MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
126 	MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
127 	MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
128 	MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
129 	MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
130 	MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
131 	MAX14577_MUIC_ADC_RESERVED_ACC_1,
132 	MAX14577_MUIC_ADC_RESERVED_ACC_2,
133 	MAX14577_MUIC_ADC_RESERVED_ACC_3,
134 	MAX14577_MUIC_ADC_RESERVED_ACC_4,
135 	MAX14577_MUIC_ADC_RESERVED_ACC_5,
136 	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
137 	MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
138 	MAX14577_MUIC_ADC_TTY_CONVERTER,
139 	MAX14577_MUIC_ADC_UART_CABLE,
140 	MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
141 	MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
142 	MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
143 	MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
144 	MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
145 	MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
146 	MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
147 	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
148 	MAX14577_MUIC_ADC_OPEN,
149 };
150 
151 static const unsigned int max14577_extcon_cable[] = {
152 	EXTCON_USB,
153 	EXTCON_TA,
154 	EXTCON_FAST_CHARGER,
155 	EXTCON_SLOW_CHARGER,
156 	EXTCON_CHARGE_DOWNSTREAM,
157 	EXTCON_JIG,
158 	EXTCON_NONE,
159 };
160 
161 /*
162  * max14577_muic_set_debounce_time - Set the debounce time of ADC
163  * @info: the instance including private data of max14577 MUIC
164  * @time: the debounce time of ADC
165  */
166 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
167 		enum max14577_muic_adc_debounce_time time)
168 {
169 	u8 ret;
170 
171 	switch (time) {
172 	case ADC_DEBOUNCE_TIME_5MS:
173 	case ADC_DEBOUNCE_TIME_10MS:
174 	case ADC_DEBOUNCE_TIME_25MS:
175 	case ADC_DEBOUNCE_TIME_38_62MS:
176 		ret = max14577_update_reg(info->max14577->regmap,
177 					  MAX14577_MUIC_REG_CONTROL3,
178 					  CTRL3_ADCDBSET_MASK,
179 					  time << CTRL3_ADCDBSET_SHIFT);
180 		if (ret) {
181 			dev_err(info->dev, "failed to set ADC debounce time\n");
182 			return ret;
183 		}
184 		break;
185 	default:
186 		dev_err(info->dev, "invalid ADC debounce time\n");
187 		return -EINVAL;
188 	}
189 
190 	return 0;
191 };
192 
193 /*
194  * max14577_muic_set_path - Set hardware line according to attached cable
195  * @info: the instance including private data of max14577 MUIC
196  * @value: the path according to attached cable
197  * @attached: the state of cable (true:attached, false:detached)
198  *
199  * The max14577 MUIC device share outside H/W line among a varity of cables
200  * so, this function set internal path of H/W line according to the type of
201  * attached cable.
202  */
203 static int max14577_muic_set_path(struct max14577_muic_info *info,
204 		u8 val, bool attached)
205 {
206 	int ret = 0;
207 	u8 ctrl1, ctrl2 = 0;
208 
209 	/* Set open state to path before changing hw path */
210 	ret = max14577_update_reg(info->max14577->regmap,
211 				MAX14577_MUIC_REG_CONTROL1,
212 				CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
213 	if (ret < 0) {
214 		dev_err(info->dev, "failed to update MUIC register\n");
215 		return ret;
216 	}
217 
218 	if (attached)
219 		ctrl1 = val;
220 	else
221 		ctrl1 = CTRL1_SW_OPEN;
222 
223 	ret = max14577_update_reg(info->max14577->regmap,
224 				MAX14577_MUIC_REG_CONTROL1,
225 				CLEAR_IDBEN_MICEN_MASK, ctrl1);
226 	if (ret < 0) {
227 		dev_err(info->dev, "failed to update MUIC register\n");
228 		return ret;
229 	}
230 
231 	if (attached)
232 		ctrl2 |= CTRL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
233 	else
234 		ctrl2 |= CTRL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */
235 
236 	ret = max14577_update_reg(info->max14577->regmap,
237 			MAX14577_REG_CONTROL2,
238 			CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
239 	if (ret < 0) {
240 		dev_err(info->dev, "failed to update MUIC register\n");
241 		return ret;
242 	}
243 
244 	dev_dbg(info->dev,
245 		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
246 		ctrl1, ctrl2, attached ? "attached" : "detached");
247 
248 	return 0;
249 }
250 
251 /*
252  * max14577_muic_get_cable_type - Return cable type and check cable state
253  * @info: the instance including private data of max14577 MUIC
254  * @group: the path according to attached cable
255  * @attached: store cable state and return
256  *
257  * This function check the cable state either attached or detached,
258  * and then divide precise type of cable according to cable group.
259  *	- max14577_CABLE_GROUP_ADC
260  *	- max14577_CABLE_GROUP_CHG
261  */
262 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
263 		enum max14577_muic_cable_group group, bool *attached)
264 {
265 	int cable_type = 0;
266 	int adc;
267 	int chg_type;
268 
269 	switch (group) {
270 	case MAX14577_CABLE_GROUP_ADC:
271 		/*
272 		 * Read ADC value to check cable type and decide cable state
273 		 * according to cable type
274 		 */
275 		adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
276 		adc >>= STATUS1_ADC_SHIFT;
277 
278 		/*
279 		 * Check current cable state/cable type and store cable type
280 		 * (info->prev_cable_type) for handling cable when cable is
281 		 * detached.
282 		 */
283 		if (adc == MAX14577_MUIC_ADC_OPEN) {
284 			*attached = false;
285 
286 			cable_type = info->prev_cable_type;
287 			info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
288 		} else {
289 			*attached = true;
290 
291 			cable_type = info->prev_cable_type = adc;
292 		}
293 		break;
294 	case MAX14577_CABLE_GROUP_CHG:
295 		/*
296 		 * Read charger type to check cable type and decide cable state
297 		 * according to type of charger cable.
298 		 */
299 		chg_type = info->status[MAX14577_MUIC_STATUS2] &
300 			STATUS2_CHGTYP_MASK;
301 		chg_type >>= STATUS2_CHGTYP_SHIFT;
302 
303 		if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
304 			*attached = false;
305 
306 			cable_type = info->prev_chg_type;
307 			info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
308 		} else {
309 			*attached = true;
310 
311 			/*
312 			 * Check current cable state/cable type and store cable
313 			 * type(info->prev_chg_type) for handling cable when
314 			 * charger cable is detached.
315 			 */
316 			cable_type = info->prev_chg_type = chg_type;
317 		}
318 
319 		break;
320 	default:
321 		dev_err(info->dev, "Unknown cable group (%d)\n", group);
322 		cable_type = -EINVAL;
323 		break;
324 	}
325 
326 	return cable_type;
327 }
328 
329 static int max14577_muic_jig_handler(struct max14577_muic_info *info,
330 		int cable_type, bool attached)
331 {
332 	int ret = 0;
333 	u8 path = CTRL1_SW_OPEN;
334 
335 	dev_dbg(info->dev,
336 		"external connector is %s (adc:0x%02x)\n",
337 		attached ? "attached" : "detached", cable_type);
338 
339 	switch (cable_type) {
340 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:	/* ADC_JIG_USB_OFF */
341 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:	/* ADC_JIG_USB_ON */
342 		/* PATH:AP_USB */
343 		path = CTRL1_SW_USB;
344 		break;
345 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:	/* ADC_JIG_UART_OFF */
346 		/* PATH:AP_UART */
347 		path = CTRL1_SW_UART;
348 		break;
349 	default:
350 		dev_err(info->dev, "failed to detect %s jig cable\n",
351 			attached ? "attached" : "detached");
352 		return -EINVAL;
353 	}
354 
355 	ret = max14577_muic_set_path(info, path, attached);
356 	if (ret < 0)
357 		return ret;
358 
359 	extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
360 
361 	return 0;
362 }
363 
364 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
365 {
366 	int cable_type;
367 	bool attached;
368 	int ret = 0;
369 
370 	/* Check accessory state which is either detached or attached */
371 	cable_type = max14577_muic_get_cable_type(info,
372 				MAX14577_CABLE_GROUP_ADC, &attached);
373 
374 	dev_dbg(info->dev,
375 		"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
376 		attached ? "attached" : "detached", cable_type,
377 		info->prev_cable_type);
378 
379 	switch (cable_type) {
380 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
381 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
382 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
383 		/* JIG */
384 		ret = max14577_muic_jig_handler(info, cable_type, attached);
385 		if (ret < 0)
386 			return ret;
387 		break;
388 	case MAX14577_MUIC_ADC_GROUND:
389 	case MAX14577_MUIC_ADC_SEND_END_BUTTON:
390 	case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
391 	case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
392 	case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
393 	case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
394 	case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
395 	case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
396 	case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
397 	case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
398 	case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
399 	case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
400 	case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
401 	case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
402 	case MAX14577_MUIC_ADC_RESERVED_ACC_1:
403 	case MAX14577_MUIC_ADC_RESERVED_ACC_2:
404 	case MAX14577_MUIC_ADC_RESERVED_ACC_3:
405 	case MAX14577_MUIC_ADC_RESERVED_ACC_4:
406 	case MAX14577_MUIC_ADC_RESERVED_ACC_5:
407 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
408 	case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
409 	case MAX14577_MUIC_ADC_TTY_CONVERTER:
410 	case MAX14577_MUIC_ADC_UART_CABLE:
411 	case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
412 	case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
413 	case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
414 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
415 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
416 		/*
417 		 * This accessory isn't used in general case if it is specially
418 		 * needed to detect additional accessory, should implement
419 		 * proper operation when this accessory is attached/detached.
420 		 */
421 		dev_info(info->dev,
422 			"accessory is %s but it isn't used (adc:0x%x)\n",
423 			attached ? "attached" : "detached", cable_type);
424 		return -EAGAIN;
425 	default:
426 		dev_err(info->dev,
427 			"failed to detect %s accessory (adc:0x%x)\n",
428 			attached ? "attached" : "detached", cable_type);
429 		return -EINVAL;
430 	}
431 
432 	return 0;
433 }
434 
435 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
436 {
437 	int chg_type;
438 	bool attached;
439 	int ret = 0;
440 
441 	chg_type = max14577_muic_get_cable_type(info,
442 				MAX14577_CABLE_GROUP_CHG, &attached);
443 
444 	dev_dbg(info->dev,
445 		"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
446 			attached ? "attached" : "detached",
447 			chg_type, info->prev_chg_type);
448 
449 	switch (chg_type) {
450 	case MAX14577_CHARGER_TYPE_USB:
451 		/* PATH:AP_USB */
452 		ret = max14577_muic_set_path(info, info->path_usb, attached);
453 		if (ret < 0)
454 			return ret;
455 
456 		extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
457 		break;
458 	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
459 		extcon_set_cable_state_(info->edev, EXTCON_TA, attached);
460 		break;
461 	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
462 		extcon_set_cable_state_(info->edev, EXTCON_CHARGE_DOWNSTREAM,
463 					attached);
464 		break;
465 	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
466 		extcon_set_cable_state_(info->edev, EXTCON_SLOW_CHARGER,
467 					attached);
468 		break;
469 	case MAX14577_CHARGER_TYPE_SPECIAL_1A:
470 		extcon_set_cable_state_(info->edev, EXTCON_FAST_CHARGER,
471 					attached);
472 		break;
473 	case MAX14577_CHARGER_TYPE_NONE:
474 	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
475 		break;
476 	default:
477 		dev_err(info->dev,
478 			"failed to detect %s accessory (chg_type:0x%x)\n",
479 			attached ? "attached" : "detached", chg_type);
480 		return -EINVAL;
481 	}
482 
483 	return 0;
484 }
485 
486 static void max14577_muic_irq_work(struct work_struct *work)
487 {
488 	struct max14577_muic_info *info = container_of(work,
489 			struct max14577_muic_info, irq_work);
490 	int ret = 0;
491 
492 	if (!info->edev)
493 		return;
494 
495 	mutex_lock(&info->mutex);
496 
497 	ret = max14577_bulk_read(info->max14577->regmap,
498 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
499 	if (ret) {
500 		dev_err(info->dev, "failed to read MUIC register\n");
501 		mutex_unlock(&info->mutex);
502 		return;
503 	}
504 
505 	if (info->irq_adc) {
506 		ret = max14577_muic_adc_handler(info);
507 		info->irq_adc = false;
508 	}
509 	if (info->irq_chg) {
510 		ret = max14577_muic_chg_handler(info);
511 		info->irq_chg = false;
512 	}
513 
514 	if (ret < 0)
515 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
516 
517 	mutex_unlock(&info->mutex);
518 }
519 
520 /*
521  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
522  * Returns 0 if irq_type does not match registered IRQ for this device type.
523  */
524 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
525 {
526 	switch (irq_type) {
527 	case MAX14577_IRQ_INT1_ADC:
528 	case MAX14577_IRQ_INT1_ADCLOW:
529 	case MAX14577_IRQ_INT1_ADCERR:
530 		/* Handle all of accessory except for
531 		   type of charger accessory */
532 		info->irq_adc = true;
533 		return 1;
534 	case MAX14577_IRQ_INT2_CHGTYP:
535 	case MAX14577_IRQ_INT2_CHGDETRUN:
536 	case MAX14577_IRQ_INT2_DCDTMR:
537 	case MAX14577_IRQ_INT2_DBCHG:
538 	case MAX14577_IRQ_INT2_VBVOLT:
539 		/* Handle charger accessory */
540 		info->irq_chg = true;
541 		return 1;
542 	default:
543 		return 0;
544 	}
545 }
546 
547 /*
548  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
549  * Returns 0 if irq_type does not match registered IRQ for this device type.
550  */
551 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
552 {
553 	/* First check common max14577 interrupts */
554 	if (max14577_parse_irq(info, irq_type))
555 		return 1;
556 
557 	switch (irq_type) {
558 	case MAX77836_IRQ_INT1_ADC1K:
559 		info->irq_adc = true;
560 		return 1;
561 	case MAX77836_IRQ_INT2_VIDRM:
562 		/* Handle charger accessory */
563 		info->irq_chg = true;
564 		return 1;
565 	default:
566 		return 0;
567 	}
568 }
569 
570 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
571 {
572 	struct max14577_muic_info *info = data;
573 	int i, irq_type = -1;
574 	bool irq_parsed;
575 
576 	/*
577 	 * We may be called multiple times for different nested IRQ-s.
578 	 * Including changes in INT1_ADC and INT2_CGHTYP at once.
579 	 * However we only need to know whether it was ADC, charger
580 	 * or both interrupts so decode IRQ and turn on proper flags.
581 	 */
582 	for (i = 0; i < info->muic_irqs_num; i++)
583 		if (irq == info->muic_irqs[i].virq)
584 			irq_type = info->muic_irqs[i].irq;
585 
586 	switch (info->max14577->dev_type) {
587 	case MAXIM_DEVICE_TYPE_MAX77836:
588 		irq_parsed = max77836_parse_irq(info, irq_type);
589 		break;
590 	case MAXIM_DEVICE_TYPE_MAX14577:
591 	default:
592 		irq_parsed = max14577_parse_irq(info, irq_type);
593 		break;
594 	}
595 
596 	if (!irq_parsed) {
597 		dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
598 				irq_type);
599 		return IRQ_HANDLED;
600 	}
601 	schedule_work(&info->irq_work);
602 
603 	return IRQ_HANDLED;
604 }
605 
606 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
607 {
608 	int ret = 0;
609 	int adc;
610 	int chg_type;
611 	bool attached;
612 
613 	mutex_lock(&info->mutex);
614 
615 	/* Read STATUSx register to detect accessory */
616 	ret = max14577_bulk_read(info->max14577->regmap,
617 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
618 	if (ret) {
619 		dev_err(info->dev, "failed to read MUIC register\n");
620 		mutex_unlock(&info->mutex);
621 		return ret;
622 	}
623 
624 	adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
625 					&attached);
626 	if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
627 		ret = max14577_muic_adc_handler(info);
628 		if (ret < 0) {
629 			dev_err(info->dev, "Cannot detect accessory\n");
630 			mutex_unlock(&info->mutex);
631 			return ret;
632 		}
633 	}
634 
635 	chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
636 					&attached);
637 	if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
638 		ret = max14577_muic_chg_handler(info);
639 		if (ret < 0) {
640 			dev_err(info->dev, "Cannot detect charger accessory\n");
641 			mutex_unlock(&info->mutex);
642 			return ret;
643 		}
644 	}
645 
646 	mutex_unlock(&info->mutex);
647 
648 	return 0;
649 }
650 
651 static void max14577_muic_detect_cable_wq(struct work_struct *work)
652 {
653 	struct max14577_muic_info *info = container_of(to_delayed_work(work),
654 				struct max14577_muic_info, wq_detcable);
655 
656 	max14577_muic_detect_accessory(info);
657 }
658 
659 static int max14577_muic_probe(struct platform_device *pdev)
660 {
661 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
662 	struct max14577_muic_info *info;
663 	int delay_jiffies;
664 	int ret;
665 	int i;
666 	u8 id;
667 
668 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
669 	if (!info)
670 		return -ENOMEM;
671 
672 	info->dev = &pdev->dev;
673 	info->max14577 = max14577;
674 
675 	platform_set_drvdata(pdev, info);
676 	mutex_init(&info->mutex);
677 
678 	INIT_WORK(&info->irq_work, max14577_muic_irq_work);
679 
680 	switch (max14577->dev_type) {
681 	case MAXIM_DEVICE_TYPE_MAX77836:
682 		info->muic_irqs = max77836_muic_irqs;
683 		info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
684 		break;
685 	case MAXIM_DEVICE_TYPE_MAX14577:
686 	default:
687 		info->muic_irqs = max14577_muic_irqs;
688 		info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
689 	}
690 
691 	/* Support irq domain for max14577 MUIC device */
692 	for (i = 0; i < info->muic_irqs_num; i++) {
693 		struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
694 		unsigned int virq = 0;
695 
696 		virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
697 		if (virq <= 0)
698 			return -EINVAL;
699 		muic_irq->virq = virq;
700 
701 		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
702 				max14577_muic_irq_handler,
703 				IRQF_NO_SUSPEND,
704 				muic_irq->name, info);
705 		if (ret) {
706 			dev_err(&pdev->dev,
707 				"failed: irq request (IRQ: %d, error :%d)\n",
708 				muic_irq->irq, ret);
709 			return ret;
710 		}
711 	}
712 
713 	/* Initialize extcon device */
714 	info->edev = devm_extcon_dev_allocate(&pdev->dev,
715 					      max14577_extcon_cable);
716 	if (IS_ERR(info->edev)) {
717 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
718 		return -ENOMEM;
719 	}
720 
721 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
722 	if (ret) {
723 		dev_err(&pdev->dev, "failed to register extcon device\n");
724 		return ret;
725 	}
726 
727 	/* Default h/w line path */
728 	info->path_usb = CTRL1_SW_USB;
729 	info->path_uart = CTRL1_SW_UART;
730 	delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
731 
732 	/* Set initial path for UART */
733 	max14577_muic_set_path(info, info->path_uart, true);
734 
735 	/* Check revision number of MUIC device*/
736 	ret = max14577_read_reg(info->max14577->regmap,
737 			MAX14577_REG_DEVICEID, &id);
738 	if (ret < 0) {
739 		dev_err(&pdev->dev, "failed to read revision number\n");
740 		return ret;
741 	}
742 	dev_info(info->dev, "device ID : 0x%x\n", id);
743 
744 	/* Set ADC debounce time */
745 	max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
746 
747 	/*
748 	 * Detect accessory after completing the initialization of platform
749 	 *
750 	 * - Use delayed workqueue to detect cable state and then
751 	 * notify cable state to notifiee/platform through uevent.
752 	 * After completing the booting of platform, the extcon provider
753 	 * driver should notify cable state to upper layer.
754 	 */
755 	INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
756 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
757 			delay_jiffies);
758 
759 	return ret;
760 }
761 
762 static int max14577_muic_remove(struct platform_device *pdev)
763 {
764 	struct max14577_muic_info *info = platform_get_drvdata(pdev);
765 
766 	cancel_work_sync(&info->irq_work);
767 
768 	return 0;
769 }
770 
771 static const struct platform_device_id max14577_muic_id[] = {
772 	{ "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
773 	{ "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
774 	{ }
775 };
776 MODULE_DEVICE_TABLE(platform, max14577_muic_id);
777 
778 static struct platform_driver max14577_muic_driver = {
779 	.driver		= {
780 		.name	= "max14577-muic",
781 	},
782 	.probe		= max14577_muic_probe,
783 	.remove		= max14577_muic_remove,
784 	.id_table	= max14577_muic_id,
785 };
786 
787 module_platform_driver(max14577_muic_driver);
788 
789 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
790 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
791 MODULE_LICENSE("GPL");
792 MODULE_ALIAS("platform:extcon-max14577");
793