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 <krzk@kernel.org>
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-provider.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_CHG_USB_SDP,
154 	EXTCON_CHG_USB_DCP,
155 	EXTCON_CHG_USB_FAST,
156 	EXTCON_CHG_USB_SLOW,
157 	EXTCON_CHG_USB_CDP,
158 	EXTCON_JIG,
159 	EXTCON_NONE,
160 };
161 
162 /*
163  * max14577_muic_set_debounce_time - Set the debounce time of ADC
164  * @info: the instance including private data of max14577 MUIC
165  * @time: the debounce time of ADC
166  */
max14577_muic_set_debounce_time(struct max14577_muic_info * info,enum max14577_muic_adc_debounce_time time)167 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
168 		enum max14577_muic_adc_debounce_time time)
169 {
170 	u8 ret;
171 
172 	switch (time) {
173 	case ADC_DEBOUNCE_TIME_5MS:
174 	case ADC_DEBOUNCE_TIME_10MS:
175 	case ADC_DEBOUNCE_TIME_25MS:
176 	case ADC_DEBOUNCE_TIME_38_62MS:
177 		ret = max14577_update_reg(info->max14577->regmap,
178 					  MAX14577_MUIC_REG_CONTROL3,
179 					  CTRL3_ADCDBSET_MASK,
180 					  time << CTRL3_ADCDBSET_SHIFT);
181 		if (ret) {
182 			dev_err(info->dev, "failed to set ADC debounce time\n");
183 			return ret;
184 		}
185 		break;
186 	default:
187 		dev_err(info->dev, "invalid ADC debounce time\n");
188 		return -EINVAL;
189 	}
190 
191 	return 0;
192 };
193 
194 /*
195  * max14577_muic_set_path - Set hardware line according to attached cable
196  * @info: the instance including private data of max14577 MUIC
197  * @value: the path according to attached cable
198  * @attached: the state of cable (true:attached, false:detached)
199  *
200  * The max14577 MUIC device share outside H/W line among a varity of cables
201  * so, this function set internal path of H/W line according to the type of
202  * attached cable.
203  */
max14577_muic_set_path(struct max14577_muic_info * info,u8 val,bool attached)204 static int max14577_muic_set_path(struct max14577_muic_info *info,
205 		u8 val, bool attached)
206 {
207 	u8 ctrl1, ctrl2 = 0;
208 	int ret;
209 
210 	/* Set open state to path before changing hw path */
211 	ret = max14577_update_reg(info->max14577->regmap,
212 				MAX14577_MUIC_REG_CONTROL1,
213 				CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
214 	if (ret < 0) {
215 		dev_err(info->dev, "failed to update MUIC register\n");
216 		return ret;
217 	}
218 
219 	if (attached)
220 		ctrl1 = val;
221 	else
222 		ctrl1 = CTRL1_SW_OPEN;
223 
224 	ret = max14577_update_reg(info->max14577->regmap,
225 				MAX14577_MUIC_REG_CONTROL1,
226 				CLEAR_IDBEN_MICEN_MASK, ctrl1);
227 	if (ret < 0) {
228 		dev_err(info->dev, "failed to update MUIC register\n");
229 		return ret;
230 	}
231 
232 	if (attached)
233 		ctrl2 |= CTRL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
234 	else
235 		ctrl2 |= CTRL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */
236 
237 	ret = max14577_update_reg(info->max14577->regmap,
238 			MAX14577_REG_CONTROL2,
239 			CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
240 	if (ret < 0) {
241 		dev_err(info->dev, "failed to update MUIC register\n");
242 		return ret;
243 	}
244 
245 	dev_dbg(info->dev,
246 		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
247 		ctrl1, ctrl2, attached ? "attached" : "detached");
248 
249 	return 0;
250 }
251 
252 /*
253  * max14577_muic_get_cable_type - Return cable type and check cable state
254  * @info: the instance including private data of max14577 MUIC
255  * @group: the path according to attached cable
256  * @attached: store cable state and return
257  *
258  * This function check the cable state either attached or detached,
259  * and then divide precise type of cable according to cable group.
260  *	- max14577_CABLE_GROUP_ADC
261  *	- max14577_CABLE_GROUP_CHG
262  */
max14577_muic_get_cable_type(struct max14577_muic_info * info,enum max14577_muic_cable_group group,bool * attached)263 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
264 		enum max14577_muic_cable_group group, bool *attached)
265 {
266 	int cable_type = 0;
267 	int adc;
268 	int chg_type;
269 
270 	switch (group) {
271 	case MAX14577_CABLE_GROUP_ADC:
272 		/*
273 		 * Read ADC value to check cable type and decide cable state
274 		 * according to cable type
275 		 */
276 		adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
277 		adc >>= STATUS1_ADC_SHIFT;
278 
279 		/*
280 		 * Check current cable state/cable type and store cable type
281 		 * (info->prev_cable_type) for handling cable when cable is
282 		 * detached.
283 		 */
284 		if (adc == MAX14577_MUIC_ADC_OPEN) {
285 			*attached = false;
286 
287 			cable_type = info->prev_cable_type;
288 			info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
289 		} else {
290 			*attached = true;
291 
292 			cable_type = info->prev_cable_type = adc;
293 		}
294 		break;
295 	case MAX14577_CABLE_GROUP_CHG:
296 		/*
297 		 * Read charger type to check cable type and decide cable state
298 		 * according to type of charger cable.
299 		 */
300 		chg_type = info->status[MAX14577_MUIC_STATUS2] &
301 			STATUS2_CHGTYP_MASK;
302 		chg_type >>= STATUS2_CHGTYP_SHIFT;
303 
304 		if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
305 			*attached = false;
306 
307 			cable_type = info->prev_chg_type;
308 			info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
309 		} else {
310 			*attached = true;
311 
312 			/*
313 			 * Check current cable state/cable type and store cable
314 			 * type(info->prev_chg_type) for handling cable when
315 			 * charger cable is detached.
316 			 */
317 			cable_type = info->prev_chg_type = chg_type;
318 		}
319 
320 		break;
321 	default:
322 		dev_err(info->dev, "Unknown cable group (%d)\n", group);
323 		cable_type = -EINVAL;
324 		break;
325 	}
326 
327 	return cable_type;
328 }
329 
max14577_muic_jig_handler(struct max14577_muic_info * info,int cable_type,bool attached)330 static int max14577_muic_jig_handler(struct max14577_muic_info *info,
331 		int cable_type, bool attached)
332 {
333 	int ret = 0;
334 	u8 path = CTRL1_SW_OPEN;
335 
336 	dev_dbg(info->dev,
337 		"external connector is %s (adc:0x%02x)\n",
338 		attached ? "attached" : "detached", cable_type);
339 
340 	switch (cable_type) {
341 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:	/* ADC_JIG_USB_OFF */
342 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:	/* ADC_JIG_USB_ON */
343 		/* PATH:AP_USB */
344 		path = CTRL1_SW_USB;
345 		break;
346 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:	/* ADC_JIG_UART_OFF */
347 		/* PATH:AP_UART */
348 		path = CTRL1_SW_UART;
349 		break;
350 	default:
351 		dev_err(info->dev, "failed to detect %s jig cable\n",
352 			attached ? "attached" : "detached");
353 		return -EINVAL;
354 	}
355 
356 	ret = max14577_muic_set_path(info, path, attached);
357 	if (ret < 0)
358 		return ret;
359 
360 	extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
361 
362 	return 0;
363 }
364 
max14577_muic_adc_handler(struct max14577_muic_info * info)365 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
366 {
367 	int cable_type;
368 	bool attached;
369 	int ret = 0;
370 
371 	/* Check accessory state which is either detached or attached */
372 	cable_type = max14577_muic_get_cable_type(info,
373 				MAX14577_CABLE_GROUP_ADC, &attached);
374 
375 	dev_dbg(info->dev,
376 		"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
377 		attached ? "attached" : "detached", cable_type,
378 		info->prev_cable_type);
379 
380 	switch (cable_type) {
381 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
382 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
383 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
384 		/* JIG */
385 		ret = max14577_muic_jig_handler(info, cable_type, attached);
386 		if (ret < 0)
387 			return ret;
388 		break;
389 	case MAX14577_MUIC_ADC_GROUND:
390 	case MAX14577_MUIC_ADC_SEND_END_BUTTON:
391 	case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
392 	case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
393 	case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
394 	case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
395 	case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
396 	case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
397 	case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
398 	case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
399 	case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
400 	case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
401 	case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
402 	case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
403 	case MAX14577_MUIC_ADC_RESERVED_ACC_1:
404 	case MAX14577_MUIC_ADC_RESERVED_ACC_2:
405 	case MAX14577_MUIC_ADC_RESERVED_ACC_3:
406 	case MAX14577_MUIC_ADC_RESERVED_ACC_4:
407 	case MAX14577_MUIC_ADC_RESERVED_ACC_5:
408 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
409 	case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
410 	case MAX14577_MUIC_ADC_TTY_CONVERTER:
411 	case MAX14577_MUIC_ADC_UART_CABLE:
412 	case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
413 	case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
414 	case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
415 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
416 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
417 		/*
418 		 * This accessory isn't used in general case if it is specially
419 		 * needed to detect additional accessory, should implement
420 		 * proper operation when this accessory is attached/detached.
421 		 */
422 		dev_info(info->dev,
423 			"accessory is %s but it isn't used (adc:0x%x)\n",
424 			attached ? "attached" : "detached", cable_type);
425 		return -EAGAIN;
426 	default:
427 		dev_err(info->dev,
428 			"failed to detect %s accessory (adc:0x%x)\n",
429 			attached ? "attached" : "detached", cable_type);
430 		return -EINVAL;
431 	}
432 
433 	return 0;
434 }
435 
max14577_muic_chg_handler(struct max14577_muic_info * info)436 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
437 {
438 	int chg_type;
439 	bool attached;
440 	int ret = 0;
441 
442 	chg_type = max14577_muic_get_cable_type(info,
443 				MAX14577_CABLE_GROUP_CHG, &attached);
444 
445 	dev_dbg(info->dev,
446 		"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
447 			attached ? "attached" : "detached",
448 			chg_type, info->prev_chg_type);
449 
450 	switch (chg_type) {
451 	case MAX14577_CHARGER_TYPE_USB:
452 		/* PATH:AP_USB */
453 		ret = max14577_muic_set_path(info, info->path_usb, attached);
454 		if (ret < 0)
455 			return ret;
456 
457 		extcon_set_state_sync(info->edev, EXTCON_USB, attached);
458 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
459 					attached);
460 		break;
461 	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
462 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
463 					attached);
464 		break;
465 	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
466 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
467 					attached);
468 		break;
469 	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
470 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
471 					attached);
472 		break;
473 	case MAX14577_CHARGER_TYPE_SPECIAL_1A:
474 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
475 					attached);
476 		break;
477 	case MAX14577_CHARGER_TYPE_NONE:
478 	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
479 		break;
480 	default:
481 		dev_err(info->dev,
482 			"failed to detect %s accessory (chg_type:0x%x)\n",
483 			attached ? "attached" : "detached", chg_type);
484 		return -EINVAL;
485 	}
486 
487 	return 0;
488 }
489 
max14577_muic_irq_work(struct work_struct * work)490 static void max14577_muic_irq_work(struct work_struct *work)
491 {
492 	struct max14577_muic_info *info = container_of(work,
493 			struct max14577_muic_info, irq_work);
494 	int ret = 0;
495 
496 	if (!info->edev)
497 		return;
498 
499 	mutex_lock(&info->mutex);
500 
501 	ret = max14577_bulk_read(info->max14577->regmap,
502 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
503 	if (ret) {
504 		dev_err(info->dev, "failed to read MUIC register\n");
505 		mutex_unlock(&info->mutex);
506 		return;
507 	}
508 
509 	if (info->irq_adc) {
510 		ret = max14577_muic_adc_handler(info);
511 		info->irq_adc = false;
512 	}
513 	if (info->irq_chg) {
514 		ret = max14577_muic_chg_handler(info);
515 		info->irq_chg = false;
516 	}
517 
518 	if (ret < 0)
519 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
520 
521 	mutex_unlock(&info->mutex);
522 }
523 
524 /*
525  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
526  * Returns 0 if irq_type does not match registered IRQ for this device type.
527  */
max14577_parse_irq(struct max14577_muic_info * info,int irq_type)528 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
529 {
530 	switch (irq_type) {
531 	case MAX14577_IRQ_INT1_ADC:
532 	case MAX14577_IRQ_INT1_ADCLOW:
533 	case MAX14577_IRQ_INT1_ADCERR:
534 		/*
535 		 * Handle all of accessory except for
536 		 * type of charger accessory.
537 		 */
538 		info->irq_adc = true;
539 		return 1;
540 	case MAX14577_IRQ_INT2_CHGTYP:
541 	case MAX14577_IRQ_INT2_CHGDETRUN:
542 	case MAX14577_IRQ_INT2_DCDTMR:
543 	case MAX14577_IRQ_INT2_DBCHG:
544 	case MAX14577_IRQ_INT2_VBVOLT:
545 		/* Handle charger accessory */
546 		info->irq_chg = true;
547 		return 1;
548 	default:
549 		return 0;
550 	}
551 }
552 
553 /*
554  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
555  * Returns 0 if irq_type does not match registered IRQ for this device type.
556  */
max77836_parse_irq(struct max14577_muic_info * info,int irq_type)557 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
558 {
559 	/* First check common max14577 interrupts */
560 	if (max14577_parse_irq(info, irq_type))
561 		return 1;
562 
563 	switch (irq_type) {
564 	case MAX77836_IRQ_INT1_ADC1K:
565 		info->irq_adc = true;
566 		return 1;
567 	case MAX77836_IRQ_INT2_VIDRM:
568 		/* Handle charger accessory */
569 		info->irq_chg = true;
570 		return 1;
571 	default:
572 		return 0;
573 	}
574 }
575 
max14577_muic_irq_handler(int irq,void * data)576 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
577 {
578 	struct max14577_muic_info *info = data;
579 	int i, irq_type = -1;
580 	bool irq_parsed;
581 
582 	/*
583 	 * We may be called multiple times for different nested IRQ-s.
584 	 * Including changes in INT1_ADC and INT2_CGHTYP at once.
585 	 * However we only need to know whether it was ADC, charger
586 	 * or both interrupts so decode IRQ and turn on proper flags.
587 	 */
588 	for (i = 0; i < info->muic_irqs_num; i++)
589 		if (irq == info->muic_irqs[i].virq)
590 			irq_type = info->muic_irqs[i].irq;
591 
592 	switch (info->max14577->dev_type) {
593 	case MAXIM_DEVICE_TYPE_MAX77836:
594 		irq_parsed = max77836_parse_irq(info, irq_type);
595 		break;
596 	case MAXIM_DEVICE_TYPE_MAX14577:
597 	default:
598 		irq_parsed = max14577_parse_irq(info, irq_type);
599 		break;
600 	}
601 
602 	if (!irq_parsed) {
603 		dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
604 				irq_type);
605 		return IRQ_HANDLED;
606 	}
607 	schedule_work(&info->irq_work);
608 
609 	return IRQ_HANDLED;
610 }
611 
max14577_muic_detect_accessory(struct max14577_muic_info * info)612 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
613 {
614 	int ret = 0;
615 	int adc;
616 	int chg_type;
617 	bool attached;
618 
619 	mutex_lock(&info->mutex);
620 
621 	/* Read STATUSx register to detect accessory */
622 	ret = max14577_bulk_read(info->max14577->regmap,
623 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
624 	if (ret) {
625 		dev_err(info->dev, "failed to read MUIC register\n");
626 		mutex_unlock(&info->mutex);
627 		return ret;
628 	}
629 
630 	adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
631 					&attached);
632 	if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
633 		ret = max14577_muic_adc_handler(info);
634 		if (ret < 0) {
635 			dev_err(info->dev, "Cannot detect accessory\n");
636 			mutex_unlock(&info->mutex);
637 			return ret;
638 		}
639 	}
640 
641 	chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
642 					&attached);
643 	if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
644 		ret = max14577_muic_chg_handler(info);
645 		if (ret < 0) {
646 			dev_err(info->dev, "Cannot detect charger accessory\n");
647 			mutex_unlock(&info->mutex);
648 			return ret;
649 		}
650 	}
651 
652 	mutex_unlock(&info->mutex);
653 
654 	return 0;
655 }
656 
max14577_muic_detect_cable_wq(struct work_struct * work)657 static void max14577_muic_detect_cable_wq(struct work_struct *work)
658 {
659 	struct max14577_muic_info *info = container_of(to_delayed_work(work),
660 				struct max14577_muic_info, wq_detcable);
661 
662 	max14577_muic_detect_accessory(info);
663 }
664 
max14577_muic_probe(struct platform_device * pdev)665 static int max14577_muic_probe(struct platform_device *pdev)
666 {
667 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
668 	struct max14577_muic_info *info;
669 	int delay_jiffies;
670 	int ret;
671 	int i;
672 	u8 id;
673 
674 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
675 	if (!info)
676 		return -ENOMEM;
677 
678 	info->dev = &pdev->dev;
679 	info->max14577 = max14577;
680 
681 	platform_set_drvdata(pdev, info);
682 	mutex_init(&info->mutex);
683 
684 	INIT_WORK(&info->irq_work, max14577_muic_irq_work);
685 
686 	switch (max14577->dev_type) {
687 	case MAXIM_DEVICE_TYPE_MAX77836:
688 		info->muic_irqs = max77836_muic_irqs;
689 		info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
690 		break;
691 	case MAXIM_DEVICE_TYPE_MAX14577:
692 	default:
693 		info->muic_irqs = max14577_muic_irqs;
694 		info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
695 	}
696 
697 	/* Support irq domain for max14577 MUIC device */
698 	for (i = 0; i < info->muic_irqs_num; i++) {
699 		struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
700 		int virq = 0;
701 
702 		virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
703 		if (virq <= 0)
704 			return -EINVAL;
705 		muic_irq->virq = virq;
706 
707 		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
708 				max14577_muic_irq_handler,
709 				IRQF_NO_SUSPEND,
710 				muic_irq->name, info);
711 		if (ret) {
712 			dev_err(&pdev->dev,
713 				"failed: irq request (IRQ: %d, error :%d)\n",
714 				muic_irq->irq, ret);
715 			return ret;
716 		}
717 	}
718 
719 	/* Initialize extcon device */
720 	info->edev = devm_extcon_dev_allocate(&pdev->dev,
721 					      max14577_extcon_cable);
722 	if (IS_ERR(info->edev)) {
723 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
724 		return -ENOMEM;
725 	}
726 
727 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
728 	if (ret) {
729 		dev_err(&pdev->dev, "failed to register extcon device\n");
730 		return ret;
731 	}
732 
733 	/* Default h/w line path */
734 	info->path_usb = CTRL1_SW_USB;
735 	info->path_uart = CTRL1_SW_UART;
736 	delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
737 
738 	/* Set initial path for UART */
739 	max14577_muic_set_path(info, info->path_uart, true);
740 
741 	/* Check revision number of MUIC device*/
742 	ret = max14577_read_reg(info->max14577->regmap,
743 			MAX14577_REG_DEVICEID, &id);
744 	if (ret < 0) {
745 		dev_err(&pdev->dev, "failed to read revision number\n");
746 		return ret;
747 	}
748 	dev_info(info->dev, "device ID : 0x%x\n", id);
749 
750 	/* Set ADC debounce time */
751 	max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
752 
753 	/*
754 	 * Detect accessory after completing the initialization of platform
755 	 *
756 	 * - Use delayed workqueue to detect cable state and then
757 	 * notify cable state to notifiee/platform through uevent.
758 	 * After completing the booting of platform, the extcon provider
759 	 * driver should notify cable state to upper layer.
760 	 */
761 	INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
762 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
763 			delay_jiffies);
764 
765 	return ret;
766 }
767 
max14577_muic_remove(struct platform_device * pdev)768 static int max14577_muic_remove(struct platform_device *pdev)
769 {
770 	struct max14577_muic_info *info = platform_get_drvdata(pdev);
771 
772 	cancel_work_sync(&info->irq_work);
773 
774 	return 0;
775 }
776 
777 static const struct platform_device_id max14577_muic_id[] = {
778 	{ "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
779 	{ "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
780 	{ }
781 };
782 MODULE_DEVICE_TABLE(platform, max14577_muic_id);
783 
784 static struct platform_driver max14577_muic_driver = {
785 	.driver		= {
786 		.name	= "max14577-muic",
787 	},
788 	.probe		= max14577_muic_probe,
789 	.remove		= max14577_muic_remove,
790 	.id_table	= max14577_muic_id,
791 };
792 
793 module_platform_driver(max14577_muic_driver);
794 
795 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
796 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
797 MODULE_LICENSE("GPL");
798 MODULE_ALIAS("platform:extcon-max14577");
799