1 /*
2  * extcon-max77693.c - MAX77693 extcon driver to support MAX77693 MUIC
3  *
4  * Copyright (C) 2012 Samsung Electrnoics
5  * Chanwoo Choi <cw00.choi@samsung.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17 
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/i2c.h>
21 #include <linux/slab.h>
22 #include <linux/input.h>
23 #include <linux/interrupt.h>
24 #include <linux/err.h>
25 #include <linux/platform_device.h>
26 #include <linux/mfd/max77693.h>
27 #include <linux/mfd/max77693-common.h>
28 #include <linux/mfd/max77693-private.h>
29 #include <linux/extcon.h>
30 #include <linux/regmap.h>
31 #include <linux/irqdomain.h>
32 
33 #define	DEV_NAME			"max77693-muic"
34 #define	DELAY_MS_DEFAULT		20000		/* unit: millisecond */
35 
36 /*
37  * Default value of MAX77693 register to bring up MUIC device.
38  * If user don't set some initial value for MUIC device through platform data,
39  * extcon-max77693 driver use 'default_init_data' to bring up base operation
40  * of MAX77693 MUIC device.
41  */
42 static struct max77693_reg_data default_init_data[] = {
43 	{
44 		/* STATUS2 - [3]ChgDetRun */
45 		.addr = MAX77693_MUIC_REG_STATUS2,
46 		.data = MAX77693_STATUS2_CHGDETRUN_MASK,
47 	}, {
48 		/* INTMASK1 - Unmask [3]ADC1KM,[0]ADCM */
49 		.addr = MAX77693_MUIC_REG_INTMASK1,
50 		.data = INTMASK1_ADC1K_MASK
51 			| INTMASK1_ADC_MASK,
52 	}, {
53 		/* INTMASK2 - Unmask [0]ChgTypM */
54 		.addr = MAX77693_MUIC_REG_INTMASK2,
55 		.data = INTMASK2_CHGTYP_MASK,
56 	}, {
57 		/* INTMASK3 - Mask all of interrupts */
58 		.addr = MAX77693_MUIC_REG_INTMASK3,
59 		.data = 0x0,
60 	}, {
61 		/* CDETCTRL2 */
62 		.addr = MAX77693_MUIC_REG_CDETCTRL2,
63 		.data = CDETCTRL2_VIDRMEN_MASK
64 			| CDETCTRL2_DXOVPEN_MASK,
65 	},
66 };
67 
68 enum max77693_muic_adc_debounce_time {
69 	ADC_DEBOUNCE_TIME_5MS = 0,
70 	ADC_DEBOUNCE_TIME_10MS,
71 	ADC_DEBOUNCE_TIME_25MS,
72 	ADC_DEBOUNCE_TIME_38_62MS,
73 };
74 
75 struct max77693_muic_info {
76 	struct device *dev;
77 	struct max77693_dev *max77693;
78 	struct extcon_dev *edev;
79 	int prev_cable_type;
80 	int prev_cable_type_gnd;
81 	int prev_chg_type;
82 	int prev_button_type;
83 	u8 status[2];
84 
85 	int irq;
86 	struct work_struct irq_work;
87 	struct mutex mutex;
88 
89 	/*
90 	 * Use delayed workqueue to detect cable state and then
91 	 * notify cable state to notifiee/platform through uevent.
92 	 * After completing the booting of platform, the extcon provider
93 	 * driver should notify cable state to upper layer.
94 	 */
95 	struct delayed_work wq_detcable;
96 
97 	/* Button of dock device */
98 	struct input_dev *dock;
99 
100 	/*
101 	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
102 	 * h/w path of COMP2/COMN1 on CONTROL1 register.
103 	 */
104 	int path_usb;
105 	int path_uart;
106 };
107 
108 enum max77693_muic_cable_group {
109 	MAX77693_CABLE_GROUP_ADC = 0,
110 	MAX77693_CABLE_GROUP_ADC_GND,
111 	MAX77693_CABLE_GROUP_CHG,
112 	MAX77693_CABLE_GROUP_VBVOLT,
113 };
114 
115 enum max77693_muic_charger_type {
116 	MAX77693_CHARGER_TYPE_NONE = 0,
117 	MAX77693_CHARGER_TYPE_USB,
118 	MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT,
119 	MAX77693_CHARGER_TYPE_DEDICATED_CHG,
120 	MAX77693_CHARGER_TYPE_APPLE_500MA,
121 	MAX77693_CHARGER_TYPE_APPLE_1A_2A,
122 	MAX77693_CHARGER_TYPE_DEAD_BATTERY = 7,
123 };
124 
125 /**
126  * struct max77693_muic_irq
127  * @irq: the index of irq list of MUIC device.
128  * @name: the name of irq.
129  * @virq: the virtual irq to use irq domain
130  */
131 struct max77693_muic_irq {
132 	unsigned int irq;
133 	const char *name;
134 	unsigned int virq;
135 };
136 
137 static struct max77693_muic_irq muic_irqs[] = {
138 	{ MAX77693_MUIC_IRQ_INT1_ADC,		"muic-ADC" },
139 	{ MAX77693_MUIC_IRQ_INT1_ADC_LOW,	"muic-ADCLOW" },
140 	{ MAX77693_MUIC_IRQ_INT1_ADC_ERR,	"muic-ADCError" },
141 	{ MAX77693_MUIC_IRQ_INT1_ADC1K,		"muic-ADC1K" },
142 	{ MAX77693_MUIC_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
143 	{ MAX77693_MUIC_IRQ_INT2_CHGDETREUN,	"muic-CHGDETREUN" },
144 	{ MAX77693_MUIC_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
145 	{ MAX77693_MUIC_IRQ_INT2_DXOVP,		"muic-DXOVP" },
146 	{ MAX77693_MUIC_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
147 	{ MAX77693_MUIC_IRQ_INT2_VIDRM,		"muic-VIDRM" },
148 	{ MAX77693_MUIC_IRQ_INT3_EOC,		"muic-EOC" },
149 	{ MAX77693_MUIC_IRQ_INT3_CGMBC,		"muic-CGMBC" },
150 	{ MAX77693_MUIC_IRQ_INT3_OVP,		"muic-OVP" },
151 	{ MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR,	"muic-MBCCHG_ERR" },
152 	{ MAX77693_MUIC_IRQ_INT3_CHG_ENABLED,	"muic-CHG_ENABLED" },
153 	{ MAX77693_MUIC_IRQ_INT3_BAT_DET,	"muic-BAT_DET" },
154 };
155 
156 /* Define supported accessory type */
157 enum max77693_muic_acc_type {
158 	MAX77693_MUIC_ADC_GROUND = 0x0,
159 	MAX77693_MUIC_ADC_SEND_END_BUTTON,
160 	MAX77693_MUIC_ADC_REMOTE_S1_BUTTON,
161 	MAX77693_MUIC_ADC_REMOTE_S2_BUTTON,
162 	MAX77693_MUIC_ADC_REMOTE_S3_BUTTON,
163 	MAX77693_MUIC_ADC_REMOTE_S4_BUTTON,
164 	MAX77693_MUIC_ADC_REMOTE_S5_BUTTON,
165 	MAX77693_MUIC_ADC_REMOTE_S6_BUTTON,
166 	MAX77693_MUIC_ADC_REMOTE_S7_BUTTON,
167 	MAX77693_MUIC_ADC_REMOTE_S8_BUTTON,
168 	MAX77693_MUIC_ADC_REMOTE_S9_BUTTON,
169 	MAX77693_MUIC_ADC_REMOTE_S10_BUTTON,
170 	MAX77693_MUIC_ADC_REMOTE_S11_BUTTON,
171 	MAX77693_MUIC_ADC_REMOTE_S12_BUTTON,
172 	MAX77693_MUIC_ADC_RESERVED_ACC_1,
173 	MAX77693_MUIC_ADC_RESERVED_ACC_2,
174 	MAX77693_MUIC_ADC_RESERVED_ACC_3,
175 	MAX77693_MUIC_ADC_RESERVED_ACC_4,
176 	MAX77693_MUIC_ADC_RESERVED_ACC_5,
177 	MAX77693_MUIC_ADC_CEA936_AUDIO,
178 	MAX77693_MUIC_ADC_PHONE_POWERED_DEV,
179 	MAX77693_MUIC_ADC_TTY_CONVERTER,
180 	MAX77693_MUIC_ADC_UART_CABLE,
181 	MAX77693_MUIC_ADC_CEA936A_TYPE1_CHG,
182 	MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF,
183 	MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON,
184 	MAX77693_MUIC_ADC_AV_CABLE_NOLOAD,
185 	MAX77693_MUIC_ADC_CEA936A_TYPE2_CHG,
186 	MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF,
187 	MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON,
188 	MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE,
189 	MAX77693_MUIC_ADC_OPEN,
190 
191 	/* The below accessories have same ADC value so ADCLow and
192 	   ADC1K bit is used to separate specific accessory */
193 						/* ADC|VBVolot|ADCLow|ADC1K| */
194 	MAX77693_MUIC_GND_USB_HOST = 0x100,	/* 0x0|      0|     0|    0| */
195 	MAX77693_MUIC_GND_USB_HOST_VB = 0x104,	/* 0x0|      1|     0|    0| */
196 	MAX77693_MUIC_GND_AV_CABLE_LOAD = 0x102,/* 0x0|      0|     1|    0| */
197 	MAX77693_MUIC_GND_MHL = 0x103,		/* 0x0|      0|     1|    1| */
198 	MAX77693_MUIC_GND_MHL_VB = 0x107,	/* 0x0|      1|     1|    1| */
199 };
200 
201 /*
202  * MAX77693 MUIC device support below list of accessories(external connector)
203  */
204 static const unsigned int max77693_extcon_cable[] = {
205 	EXTCON_USB,
206 	EXTCON_USB_HOST,
207 	EXTCON_CHG_USB_DCP,
208 	EXTCON_CHG_USB_FAST,
209 	EXTCON_CHG_USB_SLOW,
210 	EXTCON_CHG_USB_CDP,
211 	EXTCON_DISP_MHL,
212 	EXTCON_JIG,
213 	EXTCON_DOCK,
214 	EXTCON_NONE,
215 };
216 
217 /*
218  * max77693_muic_set_debounce_time - Set the debounce time of ADC
219  * @info: the instance including private data of max77693 MUIC
220  * @time: the debounce time of ADC
221  */
222 static int max77693_muic_set_debounce_time(struct max77693_muic_info *info,
223 		enum max77693_muic_adc_debounce_time time)
224 {
225 	int ret;
226 
227 	switch (time) {
228 	case ADC_DEBOUNCE_TIME_5MS:
229 	case ADC_DEBOUNCE_TIME_10MS:
230 	case ADC_DEBOUNCE_TIME_25MS:
231 	case ADC_DEBOUNCE_TIME_38_62MS:
232 		/*
233 		 * Don't touch BTLDset, JIGset when you want to change adc
234 		 * debounce time. If it writes other than 0 to BTLDset, JIGset
235 		 * muic device will be reset and loose current state.
236 		 */
237 		ret = regmap_write(info->max77693->regmap_muic,
238 				  MAX77693_MUIC_REG_CTRL3,
239 				  time << MAX77693_CONTROL3_ADCDBSET_SHIFT);
240 		if (ret) {
241 			dev_err(info->dev, "failed to set ADC debounce time\n");
242 			return ret;
243 		}
244 		break;
245 	default:
246 		dev_err(info->dev, "invalid ADC debounce time\n");
247 		return -EINVAL;
248 	}
249 
250 	return 0;
251 };
252 
253 /*
254  * max77693_muic_set_path - Set hardware line according to attached cable
255  * @info: the instance including private data of max77693 MUIC
256  * @value: the path according to attached cable
257  * @attached: the state of cable (true:attached, false:detached)
258  *
259  * The max77693 MUIC device share outside H/W line among a varity of cables
260  * so, this function set internal path of H/W line according to the type of
261  * attached cable.
262  */
263 static int max77693_muic_set_path(struct max77693_muic_info *info,
264 		u8 val, bool attached)
265 {
266 	int ret = 0;
267 	unsigned int ctrl1, ctrl2 = 0;
268 
269 	if (attached)
270 		ctrl1 = val;
271 	else
272 		ctrl1 = MAX77693_CONTROL1_SW_OPEN;
273 
274 	ret = regmap_update_bits(info->max77693->regmap_muic,
275 			MAX77693_MUIC_REG_CTRL1, COMP_SW_MASK, ctrl1);
276 	if (ret < 0) {
277 		dev_err(info->dev, "failed to update MUIC register\n");
278 		return ret;
279 	}
280 
281 	if (attached)
282 		ctrl2 |= MAX77693_CONTROL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
283 	else
284 		ctrl2 |= MAX77693_CONTROL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */
285 
286 	ret = regmap_update_bits(info->max77693->regmap_muic,
287 			MAX77693_MUIC_REG_CTRL2,
288 			MAX77693_CONTROL2_LOWPWR_MASK | MAX77693_CONTROL2_CPEN_MASK,
289 			ctrl2);
290 	if (ret < 0) {
291 		dev_err(info->dev, "failed to update MUIC register\n");
292 		return ret;
293 	}
294 
295 	dev_info(info->dev,
296 		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
297 		ctrl1, ctrl2, attached ? "attached" : "detached");
298 
299 	return 0;
300 }
301 
302 /*
303  * max77693_muic_get_cable_type - Return cable type and check cable state
304  * @info: the instance including private data of max77693 MUIC
305  * @group: the path according to attached cable
306  * @attached: store cable state and return
307  *
308  * This function check the cable state either attached or detached,
309  * and then divide precise type of cable according to cable group.
310  *	- MAX77693_CABLE_GROUP_ADC
311  *	- MAX77693_CABLE_GROUP_ADC_GND
312  *	- MAX77693_CABLE_GROUP_CHG
313  *	- MAX77693_CABLE_GROUP_VBVOLT
314  */
315 static int max77693_muic_get_cable_type(struct max77693_muic_info *info,
316 		enum max77693_muic_cable_group group, bool *attached)
317 {
318 	int cable_type = 0;
319 	int adc;
320 	int adc1k;
321 	int adclow;
322 	int vbvolt;
323 	int chg_type;
324 
325 	switch (group) {
326 	case MAX77693_CABLE_GROUP_ADC:
327 		/*
328 		 * Read ADC value to check cable type and decide cable state
329 		 * according to cable type
330 		 */
331 		adc = info->status[0] & MAX77693_STATUS1_ADC_MASK;
332 		adc >>= MAX77693_STATUS1_ADC_SHIFT;
333 
334 		/*
335 		 * Check current cable state/cable type and store cable type
336 		 * (info->prev_cable_type) for handling cable when cable is
337 		 * detached.
338 		 */
339 		if (adc == MAX77693_MUIC_ADC_OPEN) {
340 			*attached = false;
341 
342 			cable_type = info->prev_cable_type;
343 			info->prev_cable_type = MAX77693_MUIC_ADC_OPEN;
344 		} else {
345 			*attached = true;
346 
347 			cable_type = info->prev_cable_type = adc;
348 		}
349 		break;
350 	case MAX77693_CABLE_GROUP_ADC_GND:
351 		/*
352 		 * Read ADC value to check cable type and decide cable state
353 		 * according to cable type
354 		 */
355 		adc = info->status[0] & MAX77693_STATUS1_ADC_MASK;
356 		adc >>= MAX77693_STATUS1_ADC_SHIFT;
357 
358 		/*
359 		 * Check current cable state/cable type and store cable type
360 		 * (info->prev_cable_type/_gnd) for handling cable when cable
361 		 * is detached.
362 		 */
363 		if (adc == MAX77693_MUIC_ADC_OPEN) {
364 			*attached = false;
365 
366 			cable_type = info->prev_cable_type_gnd;
367 			info->prev_cable_type_gnd = MAX77693_MUIC_ADC_OPEN;
368 		} else {
369 			*attached = true;
370 
371 			adclow = info->status[0] & MAX77693_STATUS1_ADCLOW_MASK;
372 			adclow >>= MAX77693_STATUS1_ADCLOW_SHIFT;
373 			adc1k = info->status[0] & MAX77693_STATUS1_ADC1K_MASK;
374 			adc1k >>= MAX77693_STATUS1_ADC1K_SHIFT;
375 
376 			vbvolt = info->status[1] & MAX77693_STATUS2_VBVOLT_MASK;
377 			vbvolt >>= MAX77693_STATUS2_VBVOLT_SHIFT;
378 
379 			/**
380 			 * [0x1|VBVolt|ADCLow|ADC1K]
381 			 * [0x1|     0|     0|    0] USB_HOST
382 			 * [0x1|     1|     0|    0] USB_HSOT_VB
383 			 * [0x1|     0|     1|    0] Audio Video cable with load
384 			 * [0x1|     0|     1|    1] MHL without charging cable
385 			 * [0x1|     1|     1|    1] MHL with charging cable
386 			 */
387 			cable_type = ((0x1 << 8)
388 					| (vbvolt << 2)
389 					| (adclow << 1)
390 					| adc1k);
391 
392 			info->prev_cable_type = adc;
393 			info->prev_cable_type_gnd = cable_type;
394 		}
395 
396 		break;
397 	case MAX77693_CABLE_GROUP_CHG:
398 		/*
399 		 * Read charger type to check cable type and decide cable state
400 		 * according to type of charger cable.
401 		 */
402 		chg_type = info->status[1] & MAX77693_STATUS2_CHGTYP_MASK;
403 		chg_type >>= MAX77693_STATUS2_CHGTYP_SHIFT;
404 
405 		if (chg_type == MAX77693_CHARGER_TYPE_NONE) {
406 			*attached = false;
407 
408 			cable_type = info->prev_chg_type;
409 			info->prev_chg_type = MAX77693_CHARGER_TYPE_NONE;
410 		} else {
411 			*attached = true;
412 
413 			/*
414 			 * Check current cable state/cable type and store cable
415 			 * type(info->prev_chg_type) for handling cable when
416 			 * charger cable is detached.
417 			 */
418 			cable_type = info->prev_chg_type = chg_type;
419 		}
420 
421 		break;
422 	case MAX77693_CABLE_GROUP_VBVOLT:
423 		/*
424 		 * Read ADC value to check cable type and decide cable state
425 		 * according to cable type
426 		 */
427 		adc = info->status[0] & MAX77693_STATUS1_ADC_MASK;
428 		adc >>= MAX77693_STATUS1_ADC_SHIFT;
429 		chg_type = info->status[1] & MAX77693_STATUS2_CHGTYP_MASK;
430 		chg_type >>= MAX77693_STATUS2_CHGTYP_SHIFT;
431 
432 		if (adc == MAX77693_MUIC_ADC_OPEN
433 				&& chg_type == MAX77693_CHARGER_TYPE_NONE)
434 			*attached = false;
435 		else
436 			*attached = true;
437 
438 		/*
439 		 * Read vbvolt field, if vbvolt is 1,
440 		 * this cable is used for charging.
441 		 */
442 		vbvolt = info->status[1] & MAX77693_STATUS2_VBVOLT_MASK;
443 		vbvolt >>= MAX77693_STATUS2_VBVOLT_SHIFT;
444 
445 		cable_type = vbvolt;
446 		break;
447 	default:
448 		dev_err(info->dev, "Unknown cable group (%d)\n", group);
449 		cable_type = -EINVAL;
450 		break;
451 	}
452 
453 	return cable_type;
454 }
455 
456 static int max77693_muic_dock_handler(struct max77693_muic_info *info,
457 		int cable_type, bool attached)
458 {
459 	int ret = 0;
460 	int vbvolt;
461 	bool cable_attached;
462 	unsigned int dock_id;
463 
464 	dev_info(info->dev,
465 		"external connector is %s (adc:0x%02x)\n",
466 		attached ? "attached" : "detached", cable_type);
467 
468 	switch (cable_type) {
469 	case MAX77693_MUIC_ADC_RESERVED_ACC_3:		/* Dock-Smart */
470 		/*
471 		 * Check power cable whether attached or detached state.
472 		 * The Dock-Smart device need surely external power supply.
473 		 * If power cable(USB/TA) isn't connected to Dock device,
474 		 * user can't use Dock-Smart for desktop mode.
475 		 */
476 		vbvolt = max77693_muic_get_cable_type(info,
477 				MAX77693_CABLE_GROUP_VBVOLT, &cable_attached);
478 		if (attached && !vbvolt) {
479 			dev_warn(info->dev,
480 				"Cannot detect external power supply\n");
481 			return 0;
482 		}
483 
484 		/*
485 		 * Notify Dock/MHL state.
486 		 * - Dock device include three type of cable which
487 		 * are HDMI, USB for mouse/keyboard and micro-usb port
488 		 * for USB/TA cable. Dock device need always exteranl
489 		 * power supply(USB/TA cable through micro-usb cable). Dock
490 		 * device support screen output of target to separate
491 		 * monitor and mouse/keyboard for desktop mode.
492 		 *
493 		 * Features of 'USB/TA cable with Dock device'
494 		 * - Support MHL
495 		 * - Support external output feature of audio
496 		 * - Support charging through micro-usb port without data
497 		 *	     connection if TA cable is connected to target.
498 		 * - Support charging and data connection through micro-usb port
499 		 *           if USB cable is connected between target and host
500 		 *	     device.
501 		 * - Support OTG(On-The-Go) device (Ex: Mouse/Keyboard)
502 		 */
503 		ret = max77693_muic_set_path(info, info->path_usb, attached);
504 		if (ret < 0)
505 			return ret;
506 
507 		extcon_set_cable_state_(info->edev, EXTCON_DOCK, attached);
508 		extcon_set_cable_state_(info->edev, EXTCON_DISP_MHL, attached);
509 		goto out;
510 	case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:	/* Dock-Desk */
511 		dock_id = EXTCON_DOCK;
512 		break;
513 	case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:		/* Dock-Audio */
514 		dock_id = EXTCON_DOCK;
515 		if (!attached)
516 			extcon_set_cable_state_(info->edev, EXTCON_USB, false);
517 		break;
518 	default:
519 		dev_err(info->dev, "failed to detect %s dock device\n",
520 			attached ? "attached" : "detached");
521 		return -EINVAL;
522 	}
523 
524 	/* Dock-Car/Desk/Audio, PATH:AUDIO */
525 	ret = max77693_muic_set_path(info, MAX77693_CONTROL1_SW_AUDIO,
526 					attached);
527 	if (ret < 0)
528 		return ret;
529 	extcon_set_cable_state_(info->edev, dock_id, attached);
530 
531 out:
532 	return 0;
533 }
534 
535 static int max77693_muic_dock_button_handler(struct max77693_muic_info *info,
536 		int button_type, bool attached)
537 {
538 	struct input_dev *dock = info->dock;
539 	unsigned int code;
540 
541 	switch (button_type) {
542 	case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON-1
543 		... MAX77693_MUIC_ADC_REMOTE_S3_BUTTON+1:
544 		/* DOCK_KEY_PREV */
545 		code = KEY_PREVIOUSSONG;
546 		break;
547 	case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON-1
548 		... MAX77693_MUIC_ADC_REMOTE_S7_BUTTON+1:
549 		/* DOCK_KEY_NEXT */
550 		code = KEY_NEXTSONG;
551 		break;
552 	case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:
553 		/* DOCK_VOL_DOWN */
554 		code = KEY_VOLUMEDOWN;
555 		break;
556 	case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:
557 		/* DOCK_VOL_UP */
558 		code = KEY_VOLUMEUP;
559 		break;
560 	case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON-1
561 		... MAX77693_MUIC_ADC_REMOTE_S12_BUTTON+1:
562 		/* DOCK_KEY_PLAY_PAUSE */
563 		code = KEY_PLAYPAUSE;
564 		break;
565 	default:
566 		dev_err(info->dev,
567 			"failed to detect %s key (adc:0x%x)\n",
568 			attached ? "pressed" : "released", button_type);
569 		return -EINVAL;
570 	}
571 
572 	input_event(dock, EV_KEY, code, attached);
573 	input_sync(dock);
574 
575 	return 0;
576 }
577 
578 static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info)
579 {
580 	int cable_type_gnd;
581 	int ret = 0;
582 	bool attached;
583 
584 	cable_type_gnd = max77693_muic_get_cable_type(info,
585 				MAX77693_CABLE_GROUP_ADC_GND, &attached);
586 
587 	switch (cable_type_gnd) {
588 	case MAX77693_MUIC_GND_USB_HOST:
589 	case MAX77693_MUIC_GND_USB_HOST_VB:
590 		/* USB_HOST, PATH: AP_USB */
591 		ret = max77693_muic_set_path(info, MAX77693_CONTROL1_SW_USB,
592 						attached);
593 		if (ret < 0)
594 			return ret;
595 		extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, attached);
596 		break;
597 	case MAX77693_MUIC_GND_AV_CABLE_LOAD:
598 		/* Audio Video Cable with load, PATH:AUDIO */
599 		ret = max77693_muic_set_path(info, MAX77693_CONTROL1_SW_AUDIO,
600 						attached);
601 		if (ret < 0)
602 			return ret;
603 		extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
604 		break;
605 	case MAX77693_MUIC_GND_MHL:
606 	case MAX77693_MUIC_GND_MHL_VB:
607 		/* MHL or MHL with USB/TA cable */
608 		extcon_set_cable_state_(info->edev, EXTCON_DISP_MHL, attached);
609 		break;
610 	default:
611 		dev_err(info->dev, "failed to detect %s cable of gnd type\n",
612 			attached ? "attached" : "detached");
613 		return -EINVAL;
614 	}
615 
616 	return 0;
617 }
618 
619 static int max77693_muic_jig_handler(struct max77693_muic_info *info,
620 		int cable_type, bool attached)
621 {
622 	int ret = 0;
623 	u8 path = MAX77693_CONTROL1_SW_OPEN;
624 
625 	dev_info(info->dev,
626 		"external connector is %s (adc:0x%02x)\n",
627 		attached ? "attached" : "detached", cable_type);
628 
629 	switch (cable_type) {
630 	case MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF:	/* ADC_JIG_USB_OFF */
631 	case MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON:	/* ADC_JIG_USB_ON */
632 		/* PATH:AP_USB */
633 		path = MAX77693_CONTROL1_SW_USB;
634 		break;
635 	case MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF:	/* ADC_JIG_UART_OFF */
636 	case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:	/* ADC_JIG_UART_ON */
637 		/* PATH:AP_UART */
638 		path = MAX77693_CONTROL1_SW_UART;
639 		break;
640 	default:
641 		dev_err(info->dev, "failed to detect %s jig cable\n",
642 			attached ? "attached" : "detached");
643 		return -EINVAL;
644 	}
645 
646 	ret = max77693_muic_set_path(info, path, attached);
647 	if (ret < 0)
648 		return ret;
649 
650 	extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
651 
652 	return 0;
653 }
654 
655 static int max77693_muic_adc_handler(struct max77693_muic_info *info)
656 {
657 	int cable_type;
658 	int button_type;
659 	bool attached;
660 	int ret = 0;
661 
662 	/* Check accessory state which is either detached or attached */
663 	cable_type = max77693_muic_get_cable_type(info,
664 				MAX77693_CABLE_GROUP_ADC, &attached);
665 
666 	dev_info(info->dev,
667 		"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
668 		attached ? "attached" : "detached", cable_type,
669 		info->prev_cable_type);
670 
671 	switch (cable_type) {
672 	case MAX77693_MUIC_ADC_GROUND:
673 		/* USB_HOST/MHL/Audio */
674 		max77693_muic_adc_ground_handler(info);
675 		break;
676 	case MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF:
677 	case MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON:
678 	case MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF:
679 	case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:
680 		/* JIG */
681 		ret = max77693_muic_jig_handler(info, cable_type, attached);
682 		if (ret < 0)
683 			return ret;
684 		break;
685 	case MAX77693_MUIC_ADC_RESERVED_ACC_3:		/* Dock-Smart */
686 	case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:	/* Dock-Desk */
687 	case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:		/* Dock-Audio */
688 		/*
689 		 * DOCK device
690 		 *
691 		 * The MAX77693 MUIC device can detect total 34 cable type
692 		 * except of charger cable and MUIC device didn't define
693 		 * specfic role of cable in the range of from 0x01 to 0x12
694 		 * of ADC value. So, can use/define cable with no role according
695 		 * to schema of hardware board.
696 		 */
697 		ret = max77693_muic_dock_handler(info, cable_type, attached);
698 		if (ret < 0)
699 			return ret;
700 		break;
701 	case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON:      /* DOCK_KEY_PREV */
702 	case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON:      /* DOCK_KEY_NEXT */
703 	case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:      /* DOCK_VOL_DOWN */
704 	case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:     /* DOCK_VOL_UP */
705 	case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON:     /* DOCK_KEY_PLAY_PAUSE */
706 		/*
707 		 * Button of DOCK device
708 		 * - the Prev/Next/Volume Up/Volume Down/Play-Pause button
709 		 *
710 		 * The MAX77693 MUIC device can detect total 34 cable type
711 		 * except of charger cable and MUIC device didn't define
712 		 * specfic role of cable in the range of from 0x01 to 0x12
713 		 * of ADC value. So, can use/define cable with no role according
714 		 * to schema of hardware board.
715 		 */
716 		if (attached)
717 			button_type = info->prev_button_type = cable_type;
718 		else
719 			button_type = info->prev_button_type;
720 
721 		ret = max77693_muic_dock_button_handler(info, button_type,
722 							attached);
723 		if (ret < 0)
724 			return ret;
725 		break;
726 	case MAX77693_MUIC_ADC_SEND_END_BUTTON:
727 	case MAX77693_MUIC_ADC_REMOTE_S1_BUTTON:
728 	case MAX77693_MUIC_ADC_REMOTE_S2_BUTTON:
729 	case MAX77693_MUIC_ADC_REMOTE_S4_BUTTON:
730 	case MAX77693_MUIC_ADC_REMOTE_S5_BUTTON:
731 	case MAX77693_MUIC_ADC_REMOTE_S6_BUTTON:
732 	case MAX77693_MUIC_ADC_REMOTE_S8_BUTTON:
733 	case MAX77693_MUIC_ADC_REMOTE_S11_BUTTON:
734 	case MAX77693_MUIC_ADC_RESERVED_ACC_1:
735 	case MAX77693_MUIC_ADC_RESERVED_ACC_2:
736 	case MAX77693_MUIC_ADC_RESERVED_ACC_4:
737 	case MAX77693_MUIC_ADC_RESERVED_ACC_5:
738 	case MAX77693_MUIC_ADC_CEA936_AUDIO:
739 	case MAX77693_MUIC_ADC_PHONE_POWERED_DEV:
740 	case MAX77693_MUIC_ADC_TTY_CONVERTER:
741 	case MAX77693_MUIC_ADC_UART_CABLE:
742 	case MAX77693_MUIC_ADC_CEA936A_TYPE1_CHG:
743 	case MAX77693_MUIC_ADC_CEA936A_TYPE2_CHG:
744 		/*
745 		 * This accessory isn't used in general case if it is specially
746 		 * needed to detect additional accessory, should implement
747 		 * proper operation when this accessory is attached/detached.
748 		 */
749 		dev_info(info->dev,
750 			"accessory is %s but it isn't used (adc:0x%x)\n",
751 			attached ? "attached" : "detached", cable_type);
752 		return -EAGAIN;
753 	default:
754 		dev_err(info->dev,
755 			"failed to detect %s accessory (adc:0x%x)\n",
756 			attached ? "attached" : "detached", cable_type);
757 		return -EINVAL;
758 	}
759 
760 	return 0;
761 }
762 
763 static int max77693_muic_chg_handler(struct max77693_muic_info *info)
764 {
765 	int chg_type;
766 	int cable_type_gnd;
767 	int cable_type;
768 	bool attached;
769 	bool cable_attached;
770 	int ret = 0;
771 
772 	chg_type = max77693_muic_get_cable_type(info,
773 				MAX77693_CABLE_GROUP_CHG, &attached);
774 
775 	dev_info(info->dev,
776 		"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
777 			attached ? "attached" : "detached",
778 			chg_type, info->prev_chg_type);
779 
780 	switch (chg_type) {
781 	case MAX77693_CHARGER_TYPE_USB:
782 	case MAX77693_CHARGER_TYPE_DEDICATED_CHG:
783 	case MAX77693_CHARGER_TYPE_NONE:
784 		/* Check MAX77693_CABLE_GROUP_ADC_GND type */
785 		cable_type_gnd = max77693_muic_get_cable_type(info,
786 					MAX77693_CABLE_GROUP_ADC_GND,
787 					&cable_attached);
788 		switch (cable_type_gnd) {
789 		case MAX77693_MUIC_GND_MHL:
790 		case MAX77693_MUIC_GND_MHL_VB:
791 			/*
792 			 * MHL cable with USB/TA cable
793 			 * - MHL cable include two port(HDMI line and separate
794 			 * micro-usb port. When the target connect MHL cable,
795 			 * extcon driver check whether USB/TA cable is
796 			 * connected. If USB/TA cable is connected, extcon
797 			 * driver notify state to notifiee for charging battery.
798 			 *
799 			 * Features of 'USB/TA with MHL cable'
800 			 * - Support MHL
801 			 * - Support charging through micro-usb port without
802 			 *   data connection
803 			 */
804 			extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_DCP,
805 						attached);
806 			if (!cable_attached)
807 				extcon_set_cable_state_(info->edev,
808 					EXTCON_DISP_MHL, cable_attached);
809 			break;
810 		}
811 
812 		/* Check MAX77693_CABLE_GROUP_ADC type */
813 		cable_type = max77693_muic_get_cable_type(info,
814 					MAX77693_CABLE_GROUP_ADC,
815 					&cable_attached);
816 		switch (cable_type) {
817 		case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:		/* Dock-Audio */
818 			/*
819 			 * Dock-Audio device with USB/TA cable
820 			 * - Dock device include two port(Dock-Audio and micro-
821 			 * usb port). When the target connect Dock-Audio device,
822 			 * extcon driver check whether USB/TA cable is connected
823 			 * or not. If USB/TA cable is connected, extcon driver
824 			 * notify state to notifiee for charging battery.
825 			 *
826 			 * Features of 'USB/TA cable with Dock-Audio device'
827 			 * - Support external output feature of audio.
828 			 * - Support charging through micro-usb port without
829 			 *   data connection.
830 			 */
831 			extcon_set_cable_state_(info->edev, EXTCON_USB,
832 						attached);
833 
834 			if (!cable_attached)
835 				extcon_set_cable_state_(info->edev, EXTCON_DOCK,
836 							cable_attached);
837 			break;
838 		case MAX77693_MUIC_ADC_RESERVED_ACC_3:		/* Dock-Smart */
839 			/*
840 			 * Dock-Smart device with USB/TA cable
841 			 * - Dock-Desk device include three type of cable which
842 			 * are HDMI, USB for mouse/keyboard and micro-usb port
843 			 * for USB/TA cable. Dock-Smart device need always
844 			 * exteranl power supply(USB/TA cable through micro-usb
845 			 * cable). Dock-Smart device support screen output of
846 			 * target to separate monitor and mouse/keyboard for
847 			 * desktop mode.
848 			 *
849 			 * Features of 'USB/TA cable with Dock-Smart device'
850 			 * - Support MHL
851 			 * - Support external output feature of audio
852 			 * - Support charging through micro-usb port without
853 			 *   data connection if TA cable is connected to target.
854 			 * - Support charging and data connection through micro-
855 			 *   usb port if USB cable is connected between target
856 			 *   and host device
857 			 * - Support OTG(On-The-Go) device (Ex: Mouse/Keyboard)
858 			 */
859 			ret = max77693_muic_set_path(info, info->path_usb,
860 						    attached);
861 			if (ret < 0)
862 				return ret;
863 
864 			extcon_set_cable_state_(info->edev, EXTCON_DOCK,
865 						attached);
866 			extcon_set_cable_state_(info->edev, EXTCON_DISP_MHL,
867 						attached);
868 			break;
869 		}
870 
871 		/* Check MAX77693_CABLE_GROUP_CHG type */
872 		switch (chg_type) {
873 		case MAX77693_CHARGER_TYPE_NONE:
874 			/*
875 			 * When MHL(with USB/TA cable) or Dock-Audio with USB/TA
876 			 * cable is attached, muic device happen below two irq.
877 			 * - 'MAX77693_MUIC_IRQ_INT1_ADC' for detecting
878 			 *    MHL/Dock-Audio.
879 			 * - 'MAX77693_MUIC_IRQ_INT2_CHGTYP' for detecting
880 			 *    USB/TA cable connected to MHL or Dock-Audio.
881 			 * Always, happen eariler MAX77693_MUIC_IRQ_INT1_ADC
882 			 * irq than MAX77693_MUIC_IRQ_INT2_CHGTYP irq.
883 			 *
884 			 * If user attach MHL (with USB/TA cable and immediately
885 			 * detach MHL with USB/TA cable before MAX77693_MUIC_IRQ
886 			 * _INT2_CHGTYP irq is happened, USB/TA cable remain
887 			 * connected state to target. But USB/TA cable isn't
888 			 * connected to target. The user be face with unusual
889 			 * action. So, driver should check this situation in
890 			 * spite of, that previous charger type is N/A.
891 			 */
892 			break;
893 		case MAX77693_CHARGER_TYPE_USB:
894 			/* Only USB cable, PATH:AP_USB */
895 			ret = max77693_muic_set_path(info, info->path_usb,
896 						    attached);
897 			if (ret < 0)
898 				return ret;
899 
900 			extcon_set_cable_state_(info->edev, EXTCON_USB,
901 						attached);
902 			break;
903 		case MAX77693_CHARGER_TYPE_DEDICATED_CHG:
904 			/* Only TA cable */
905 			extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_DCP,
906 						attached);
907 			break;
908 		}
909 		break;
910 	case MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT:
911 		extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_CDP,
912 					attached);
913 		break;
914 	case MAX77693_CHARGER_TYPE_APPLE_500MA:
915 		extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SLOW,
916 					attached);
917 		break;
918 	case MAX77693_CHARGER_TYPE_APPLE_1A_2A:
919 		extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_FAST,
920 					attached);
921 		break;
922 	case MAX77693_CHARGER_TYPE_DEAD_BATTERY:
923 		break;
924 	default:
925 		dev_err(info->dev,
926 			"failed to detect %s accessory (chg_type:0x%x)\n",
927 			attached ? "attached" : "detached", chg_type);
928 		return -EINVAL;
929 	}
930 
931 	return 0;
932 }
933 
934 static void max77693_muic_irq_work(struct work_struct *work)
935 {
936 	struct max77693_muic_info *info = container_of(work,
937 			struct max77693_muic_info, irq_work);
938 	int irq_type = -1;
939 	int i, ret = 0;
940 
941 	if (!info->edev)
942 		return;
943 
944 	mutex_lock(&info->mutex);
945 
946 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
947 		if (info->irq == muic_irqs[i].virq)
948 			irq_type = muic_irqs[i].irq;
949 
950 	ret = regmap_bulk_read(info->max77693->regmap_muic,
951 			MAX77693_MUIC_REG_STATUS1, info->status, 2);
952 	if (ret) {
953 		dev_err(info->dev, "failed to read MUIC register\n");
954 		mutex_unlock(&info->mutex);
955 		return;
956 	}
957 
958 	switch (irq_type) {
959 	case MAX77693_MUIC_IRQ_INT1_ADC:
960 	case MAX77693_MUIC_IRQ_INT1_ADC_LOW:
961 	case MAX77693_MUIC_IRQ_INT1_ADC_ERR:
962 	case MAX77693_MUIC_IRQ_INT1_ADC1K:
963 		/* Handle all of accessory except for
964 		   type of charger accessory */
965 		ret = max77693_muic_adc_handler(info);
966 		break;
967 	case MAX77693_MUIC_IRQ_INT2_CHGTYP:
968 	case MAX77693_MUIC_IRQ_INT2_CHGDETREUN:
969 	case MAX77693_MUIC_IRQ_INT2_DCDTMR:
970 	case MAX77693_MUIC_IRQ_INT2_DXOVP:
971 	case MAX77693_MUIC_IRQ_INT2_VBVOLT:
972 	case MAX77693_MUIC_IRQ_INT2_VIDRM:
973 		/* Handle charger accessory */
974 		ret = max77693_muic_chg_handler(info);
975 		break;
976 	case MAX77693_MUIC_IRQ_INT3_EOC:
977 	case MAX77693_MUIC_IRQ_INT3_CGMBC:
978 	case MAX77693_MUIC_IRQ_INT3_OVP:
979 	case MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR:
980 	case MAX77693_MUIC_IRQ_INT3_CHG_ENABLED:
981 	case MAX77693_MUIC_IRQ_INT3_BAT_DET:
982 		break;
983 	default:
984 		dev_err(info->dev, "muic interrupt: irq %d occurred\n",
985 				irq_type);
986 		mutex_unlock(&info->mutex);
987 		return;
988 	}
989 
990 	if (ret < 0)
991 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
992 
993 	mutex_unlock(&info->mutex);
994 }
995 
996 static irqreturn_t max77693_muic_irq_handler(int irq, void *data)
997 {
998 	struct max77693_muic_info *info = data;
999 
1000 	info->irq = irq;
1001 	schedule_work(&info->irq_work);
1002 
1003 	return IRQ_HANDLED;
1004 }
1005 
1006 static const struct regmap_config max77693_muic_regmap_config = {
1007 	.reg_bits = 8,
1008 	.val_bits = 8,
1009 };
1010 
1011 static int max77693_muic_detect_accessory(struct max77693_muic_info *info)
1012 {
1013 	int ret = 0;
1014 	int adc;
1015 	int chg_type;
1016 	bool attached;
1017 
1018 	mutex_lock(&info->mutex);
1019 
1020 	/* Read STATUSx register to detect accessory */
1021 	ret = regmap_bulk_read(info->max77693->regmap_muic,
1022 			MAX77693_MUIC_REG_STATUS1, info->status, 2);
1023 	if (ret) {
1024 		dev_err(info->dev, "failed to read MUIC register\n");
1025 		mutex_unlock(&info->mutex);
1026 		return ret;
1027 	}
1028 
1029 	adc = max77693_muic_get_cable_type(info, MAX77693_CABLE_GROUP_ADC,
1030 					&attached);
1031 	if (attached && adc != MAX77693_MUIC_ADC_OPEN) {
1032 		ret = max77693_muic_adc_handler(info);
1033 		if (ret < 0) {
1034 			dev_err(info->dev, "Cannot detect accessory\n");
1035 			mutex_unlock(&info->mutex);
1036 			return ret;
1037 		}
1038 	}
1039 
1040 	chg_type = max77693_muic_get_cable_type(info, MAX77693_CABLE_GROUP_CHG,
1041 					&attached);
1042 	if (attached && chg_type != MAX77693_CHARGER_TYPE_NONE) {
1043 		ret = max77693_muic_chg_handler(info);
1044 		if (ret < 0) {
1045 			dev_err(info->dev, "Cannot detect charger accessory\n");
1046 			mutex_unlock(&info->mutex);
1047 			return ret;
1048 		}
1049 	}
1050 
1051 	mutex_unlock(&info->mutex);
1052 
1053 	return 0;
1054 }
1055 
1056 static void max77693_muic_detect_cable_wq(struct work_struct *work)
1057 {
1058 	struct max77693_muic_info *info = container_of(to_delayed_work(work),
1059 				struct max77693_muic_info, wq_detcable);
1060 
1061 	max77693_muic_detect_accessory(info);
1062 }
1063 
1064 static int max77693_muic_probe(struct platform_device *pdev)
1065 {
1066 	struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
1067 	struct max77693_platform_data *pdata = dev_get_platdata(max77693->dev);
1068 	struct max77693_muic_info *info;
1069 	struct max77693_reg_data *init_data;
1070 	int num_init_data;
1071 	int delay_jiffies;
1072 	int ret;
1073 	int i;
1074 	unsigned int id;
1075 
1076 	info = devm_kzalloc(&pdev->dev, sizeof(struct max77693_muic_info),
1077 				   GFP_KERNEL);
1078 	if (!info)
1079 		return -ENOMEM;
1080 
1081 	info->dev = &pdev->dev;
1082 	info->max77693 = max77693;
1083 	if (info->max77693->regmap_muic) {
1084 		dev_dbg(&pdev->dev, "allocate register map\n");
1085 	} else {
1086 		info->max77693->regmap_muic = devm_regmap_init_i2c(
1087 						info->max77693->i2c_muic,
1088 						&max77693_muic_regmap_config);
1089 		if (IS_ERR(info->max77693->regmap_muic)) {
1090 			ret = PTR_ERR(info->max77693->regmap_muic);
1091 			dev_err(max77693->dev,
1092 				"failed to allocate register map: %d\n", ret);
1093 			return ret;
1094 		}
1095 	}
1096 
1097 	/* Register input device for button of dock device */
1098 	info->dock = devm_input_allocate_device(&pdev->dev);
1099 	if (!info->dock) {
1100 		dev_err(&pdev->dev, "%s: failed to allocate input\n", __func__);
1101 		return -ENOMEM;
1102 	}
1103 	info->dock->name = "max77693-muic/dock";
1104 	info->dock->phys = "max77693-muic/extcon";
1105 	info->dock->dev.parent = &pdev->dev;
1106 
1107 	__set_bit(EV_REP, info->dock->evbit);
1108 
1109 	input_set_capability(info->dock, EV_KEY, KEY_VOLUMEUP);
1110 	input_set_capability(info->dock, EV_KEY, KEY_VOLUMEDOWN);
1111 	input_set_capability(info->dock, EV_KEY, KEY_PLAYPAUSE);
1112 	input_set_capability(info->dock, EV_KEY, KEY_PREVIOUSSONG);
1113 	input_set_capability(info->dock, EV_KEY, KEY_NEXTSONG);
1114 
1115 	ret = input_register_device(info->dock);
1116 	if (ret < 0) {
1117 		dev_err(&pdev->dev, "Cannot register input device error(%d)\n",
1118 				ret);
1119 		return ret;
1120 	}
1121 
1122 	platform_set_drvdata(pdev, info);
1123 	mutex_init(&info->mutex);
1124 
1125 	INIT_WORK(&info->irq_work, max77693_muic_irq_work);
1126 
1127 	/* Support irq domain for MAX77693 MUIC device */
1128 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
1129 		struct max77693_muic_irq *muic_irq = &muic_irqs[i];
1130 		unsigned int virq = 0;
1131 
1132 		virq = regmap_irq_get_virq(max77693->irq_data_muic,
1133 					muic_irq->irq);
1134 		if (!virq)
1135 			return -EINVAL;
1136 		muic_irq->virq = virq;
1137 
1138 		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
1139 				max77693_muic_irq_handler,
1140 				IRQF_NO_SUSPEND,
1141 				muic_irq->name, info);
1142 		if (ret) {
1143 			dev_err(&pdev->dev,
1144 				"failed: irq request (IRQ: %d, error :%d)\n",
1145 				muic_irq->irq, ret);
1146 			return ret;
1147 		}
1148 	}
1149 
1150 	/* Initialize extcon device */
1151 	info->edev = devm_extcon_dev_allocate(&pdev->dev,
1152 					      max77693_extcon_cable);
1153 	if (IS_ERR(info->edev)) {
1154 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
1155 		return -ENOMEM;
1156 	}
1157 
1158 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
1159 	if (ret) {
1160 		dev_err(&pdev->dev, "failed to register extcon device\n");
1161 		return ret;
1162 	}
1163 
1164 	/* Initialize MUIC register by using platform data or default data */
1165 	if (pdata && pdata->muic_data) {
1166 		init_data = pdata->muic_data->init_data;
1167 		num_init_data = pdata->muic_data->num_init_data;
1168 	} else {
1169 		init_data = default_init_data;
1170 		num_init_data = ARRAY_SIZE(default_init_data);
1171 	}
1172 
1173 	for (i = 0; i < num_init_data; i++) {
1174 		regmap_write(info->max77693->regmap_muic,
1175 				init_data[i].addr,
1176 				init_data[i].data);
1177 	}
1178 
1179 	if (pdata && pdata->muic_data) {
1180 		struct max77693_muic_platform_data *muic_pdata
1181 						   = pdata->muic_data;
1182 
1183 		/*
1184 		 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
1185 		 * h/w path of COMP2/COMN1 on CONTROL1 register.
1186 		 */
1187 		if (muic_pdata->path_uart)
1188 			info->path_uart = muic_pdata->path_uart;
1189 		else
1190 			info->path_uart = MAX77693_CONTROL1_SW_UART;
1191 
1192 		if (muic_pdata->path_usb)
1193 			info->path_usb = muic_pdata->path_usb;
1194 		else
1195 			info->path_usb = MAX77693_CONTROL1_SW_USB;
1196 
1197 		/*
1198 		 * Default delay time for detecting cable state
1199 		 * after certain time.
1200 		 */
1201 		if (muic_pdata->detcable_delay_ms)
1202 			delay_jiffies =
1203 				msecs_to_jiffies(muic_pdata->detcable_delay_ms);
1204 		else
1205 			delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
1206 	} else {
1207 		info->path_usb = MAX77693_CONTROL1_SW_USB;
1208 		info->path_uart = MAX77693_CONTROL1_SW_UART;
1209 		delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
1210 	}
1211 
1212 	/* Set initial path for UART */
1213 	 max77693_muic_set_path(info, info->path_uart, true);
1214 
1215 	/* Check revision number of MUIC device*/
1216 	ret = regmap_read(info->max77693->regmap_muic,
1217 			MAX77693_MUIC_REG_ID, &id);
1218 	if (ret < 0) {
1219 		dev_err(&pdev->dev, "failed to read revision number\n");
1220 		return ret;
1221 	}
1222 	dev_info(info->dev, "device ID : 0x%x\n", id);
1223 
1224 	/* Set ADC debounce time */
1225 	max77693_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
1226 
1227 	/*
1228 	 * Detect accessory after completing the initialization of platform
1229 	 *
1230 	 * - Use delayed workqueue to detect cable state and then
1231 	 * notify cable state to notifiee/platform through uevent.
1232 	 * After completing the booting of platform, the extcon provider
1233 	 * driver should notify cable state to upper layer.
1234 	 */
1235 	INIT_DELAYED_WORK(&info->wq_detcable, max77693_muic_detect_cable_wq);
1236 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
1237 			delay_jiffies);
1238 
1239 	return ret;
1240 }
1241 
1242 static int max77693_muic_remove(struct platform_device *pdev)
1243 {
1244 	struct max77693_muic_info *info = platform_get_drvdata(pdev);
1245 
1246 	cancel_work_sync(&info->irq_work);
1247 	input_unregister_device(info->dock);
1248 
1249 	return 0;
1250 }
1251 
1252 static struct platform_driver max77693_muic_driver = {
1253 	.driver		= {
1254 		.name	= DEV_NAME,
1255 	},
1256 	.probe		= max77693_muic_probe,
1257 	.remove		= max77693_muic_remove,
1258 };
1259 
1260 module_platform_driver(max77693_muic_driver);
1261 
1262 MODULE_DESCRIPTION("Maxim MAX77693 Extcon driver");
1263 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1264 MODULE_LICENSE("GPL");
1265 MODULE_ALIAS("platform:extcon-max77693");
1266