xref: /linux/drivers/power/supply/charger-manager.c (revision 905e46acd3272d04566fec49afbd7ad9e2ed9ae3)
1 /*
2  * Copyright (C) 2011 Samsung Electronics Co., Ltd.
3  * MyungJoo Ham <myungjoo.ham@samsung.com>
4  *
5  * This driver enables to monitor battery health and control charger
6  * during suspend-to-mem.
7  * Charger manager depends on other devices. register this later than
8  * the depending devices.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13 **/
14 
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 
17 #include <linux/io.h>
18 #include <linux/module.h>
19 #include <linux/irq.h>
20 #include <linux/interrupt.h>
21 #include <linux/rtc.h>
22 #include <linux/slab.h>
23 #include <linux/workqueue.h>
24 #include <linux/platform_device.h>
25 #include <linux/power/charger-manager.h>
26 #include <linux/regulator/consumer.h>
27 #include <linux/sysfs.h>
28 #include <linux/of.h>
29 #include <linux/thermal.h>
30 
31 /*
32  * Default termperature threshold for charging.
33  * Every temperature units are in tenth of centigrade.
34  */
35 #define CM_DEFAULT_RECHARGE_TEMP_DIFF	50
36 #define CM_DEFAULT_CHARGE_TEMP_MAX	500
37 
38 static const char * const default_event_names[] = {
39 	[CM_EVENT_UNKNOWN] = "Unknown",
40 	[CM_EVENT_BATT_FULL] = "Battery Full",
41 	[CM_EVENT_BATT_IN] = "Battery Inserted",
42 	[CM_EVENT_BATT_OUT] = "Battery Pulled Out",
43 	[CM_EVENT_BATT_OVERHEAT] = "Battery Overheat",
44 	[CM_EVENT_BATT_COLD] = "Battery Cold",
45 	[CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
46 	[CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
47 	[CM_EVENT_OTHERS] = "Other battery events"
48 };
49 
50 /*
51  * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
52  * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
53  * without any delays.
54  */
55 #define	CM_JIFFIES_SMALL	(2)
56 
57 /* If y is valid (> 0) and smaller than x, do x = y */
58 #define CM_MIN_VALID(x, y)	x = (((y > 0) && ((x) > (y))) ? (y) : (x))
59 
60 /*
61  * Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
62  * rtc alarm. It should be 2 or larger
63  */
64 #define CM_RTC_SMALL		(2)
65 
66 #define UEVENT_BUF_SIZE		32
67 
68 static LIST_HEAD(cm_list);
69 static DEFINE_MUTEX(cm_list_mtx);
70 
71 /* About in-suspend (suspend-again) monitoring */
72 static struct alarm *cm_timer;
73 
74 static bool cm_suspended;
75 static bool cm_timer_set;
76 static unsigned long cm_suspend_duration_ms;
77 
78 /* About normal (not suspended) monitoring */
79 static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
80 static unsigned long next_polling; /* Next appointed polling time */
81 static struct workqueue_struct *cm_wq; /* init at driver add */
82 static struct delayed_work cm_monitor_work; /* init at driver add */
83 
84 /**
85  * is_batt_present - See if the battery presents in place.
86  * @cm: the Charger Manager representing the battery.
87  */
88 static bool is_batt_present(struct charger_manager *cm)
89 {
90 	union power_supply_propval val;
91 	struct power_supply *psy;
92 	bool present = false;
93 	int i, ret;
94 
95 	switch (cm->desc->battery_present) {
96 	case CM_BATTERY_PRESENT:
97 		present = true;
98 		break;
99 	case CM_NO_BATTERY:
100 		break;
101 	case CM_FUEL_GAUGE:
102 		psy = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
103 		if (!psy)
104 			break;
105 
106 		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_PRESENT,
107 				&val);
108 		if (ret == 0 && val.intval)
109 			present = true;
110 		power_supply_put(psy);
111 		break;
112 	case CM_CHARGER_STAT:
113 		for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
114 			psy = power_supply_get_by_name(
115 					cm->desc->psy_charger_stat[i]);
116 			if (!psy) {
117 				dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
118 					cm->desc->psy_charger_stat[i]);
119 				continue;
120 			}
121 
122 			ret = power_supply_get_property(psy,
123 				POWER_SUPPLY_PROP_PRESENT, &val);
124 			power_supply_put(psy);
125 			if (ret == 0 && val.intval) {
126 				present = true;
127 				break;
128 			}
129 		}
130 		break;
131 	}
132 
133 	return present;
134 }
135 
136 /**
137  * is_ext_pwr_online - See if an external power source is attached to charge
138  * @cm: the Charger Manager representing the battery.
139  *
140  * Returns true if at least one of the chargers of the battery has an external
141  * power source attached to charge the battery regardless of whether it is
142  * actually charging or not.
143  */
144 static bool is_ext_pwr_online(struct charger_manager *cm)
145 {
146 	union power_supply_propval val;
147 	struct power_supply *psy;
148 	bool online = false;
149 	int i, ret;
150 
151 	/* If at least one of them has one, it's yes. */
152 	for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
153 		psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
154 		if (!psy) {
155 			dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
156 					cm->desc->psy_charger_stat[i]);
157 			continue;
158 		}
159 
160 		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
161 				&val);
162 		power_supply_put(psy);
163 		if (ret == 0 && val.intval) {
164 			online = true;
165 			break;
166 		}
167 	}
168 
169 	return online;
170 }
171 
172 /**
173  * get_batt_uV - Get the voltage level of the battery
174  * @cm: the Charger Manager representing the battery.
175  * @uV: the voltage level returned.
176  *
177  * Returns 0 if there is no error.
178  * Returns a negative value on error.
179  */
180 static int get_batt_uV(struct charger_manager *cm, int *uV)
181 {
182 	union power_supply_propval val;
183 	struct power_supply *fuel_gauge;
184 	int ret;
185 
186 	fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
187 	if (!fuel_gauge)
188 		return -ENODEV;
189 
190 	ret = power_supply_get_property(fuel_gauge,
191 				POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
192 	power_supply_put(fuel_gauge);
193 	if (ret)
194 		return ret;
195 
196 	*uV = val.intval;
197 	return 0;
198 }
199 
200 /**
201  * is_charging - Returns true if the battery is being charged.
202  * @cm: the Charger Manager representing the battery.
203  */
204 static bool is_charging(struct charger_manager *cm)
205 {
206 	int i, ret;
207 	bool charging = false;
208 	struct power_supply *psy;
209 	union power_supply_propval val;
210 
211 	/* If there is no battery, it cannot be charged */
212 	if (!is_batt_present(cm))
213 		return false;
214 
215 	/* If at least one of the charger is charging, return yes */
216 	for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
217 		/* 1. The charger sholuld not be DISABLED */
218 		if (cm->emergency_stop)
219 			continue;
220 		if (!cm->charger_enabled)
221 			continue;
222 
223 		psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
224 		if (!psy) {
225 			dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
226 					cm->desc->psy_charger_stat[i]);
227 			continue;
228 		}
229 
230 		/* 2. The charger should be online (ext-power) */
231 		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
232 				&val);
233 		if (ret) {
234 			dev_warn(cm->dev, "Cannot read ONLINE value from %s\n",
235 				 cm->desc->psy_charger_stat[i]);
236 			power_supply_put(psy);
237 			continue;
238 		}
239 		if (val.intval == 0) {
240 			power_supply_put(psy);
241 			continue;
242 		}
243 
244 		/*
245 		 * 3. The charger should not be FULL, DISCHARGING,
246 		 * or NOT_CHARGING.
247 		 */
248 		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS,
249 				&val);
250 		power_supply_put(psy);
251 		if (ret) {
252 			dev_warn(cm->dev, "Cannot read STATUS value from %s\n",
253 				 cm->desc->psy_charger_stat[i]);
254 			continue;
255 		}
256 		if (val.intval == POWER_SUPPLY_STATUS_FULL ||
257 				val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
258 				val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
259 			continue;
260 
261 		/* Then, this is charging. */
262 		charging = true;
263 		break;
264 	}
265 
266 	return charging;
267 }
268 
269 /**
270  * is_full_charged - Returns true if the battery is fully charged.
271  * @cm: the Charger Manager representing the battery.
272  */
273 static bool is_full_charged(struct charger_manager *cm)
274 {
275 	struct charger_desc *desc = cm->desc;
276 	union power_supply_propval val;
277 	struct power_supply *fuel_gauge;
278 	bool is_full = false;
279 	int ret = 0;
280 	int uV;
281 
282 	/* If there is no battery, it cannot be charged */
283 	if (!is_batt_present(cm))
284 		return false;
285 
286 	fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
287 	if (!fuel_gauge)
288 		return false;
289 
290 	if (desc->fullbatt_full_capacity > 0) {
291 		val.intval = 0;
292 
293 		/* Not full if capacity of fuel gauge isn't full */
294 		ret = power_supply_get_property(fuel_gauge,
295 				POWER_SUPPLY_PROP_CHARGE_FULL, &val);
296 		if (!ret && val.intval > desc->fullbatt_full_capacity) {
297 			is_full = true;
298 			goto out;
299 		}
300 	}
301 
302 	/* Full, if it's over the fullbatt voltage */
303 	if (desc->fullbatt_uV > 0) {
304 		ret = get_batt_uV(cm, &uV);
305 		if (!ret && uV >= desc->fullbatt_uV) {
306 			is_full = true;
307 			goto out;
308 		}
309 	}
310 
311 	/* Full, if the capacity is more than fullbatt_soc */
312 	if (desc->fullbatt_soc > 0) {
313 		val.intval = 0;
314 
315 		ret = power_supply_get_property(fuel_gauge,
316 				POWER_SUPPLY_PROP_CAPACITY, &val);
317 		if (!ret && val.intval >= desc->fullbatt_soc) {
318 			is_full = true;
319 			goto out;
320 		}
321 	}
322 
323 out:
324 	power_supply_put(fuel_gauge);
325 	return is_full;
326 }
327 
328 /**
329  * is_polling_required - Return true if need to continue polling for this CM.
330  * @cm: the Charger Manager representing the battery.
331  */
332 static bool is_polling_required(struct charger_manager *cm)
333 {
334 	switch (cm->desc->polling_mode) {
335 	case CM_POLL_DISABLE:
336 		return false;
337 	case CM_POLL_ALWAYS:
338 		return true;
339 	case CM_POLL_EXTERNAL_POWER_ONLY:
340 		return is_ext_pwr_online(cm);
341 	case CM_POLL_CHARGING_ONLY:
342 		return is_charging(cm);
343 	default:
344 		dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
345 			 cm->desc->polling_mode);
346 	}
347 
348 	return false;
349 }
350 
351 /**
352  * try_charger_enable - Enable/Disable chargers altogether
353  * @cm: the Charger Manager representing the battery.
354  * @enable: true: enable / false: disable
355  *
356  * Note that Charger Manager keeps the charger enabled regardless whether
357  * the charger is charging or not (because battery is full or no external
358  * power source exists) except when CM needs to disable chargers forcibly
359  * bacause of emergency causes; when the battery is overheated or too cold.
360  */
361 static int try_charger_enable(struct charger_manager *cm, bool enable)
362 {
363 	int err = 0, i;
364 	struct charger_desc *desc = cm->desc;
365 
366 	/* Ignore if it's redundent command */
367 	if (enable == cm->charger_enabled)
368 		return 0;
369 
370 	if (enable) {
371 		if (cm->emergency_stop)
372 			return -EAGAIN;
373 
374 		/*
375 		 * Save start time of charging to limit
376 		 * maximum possible charging time.
377 		 */
378 		cm->charging_start_time = ktime_to_ms(ktime_get());
379 		cm->charging_end_time = 0;
380 
381 		for (i = 0 ; i < desc->num_charger_regulators ; i++) {
382 			if (desc->charger_regulators[i].externally_control)
383 				continue;
384 
385 			err = regulator_enable(desc->charger_regulators[i].consumer);
386 			if (err < 0) {
387 				dev_warn(cm->dev, "Cannot enable %s regulator\n",
388 					 desc->charger_regulators[i].regulator_name);
389 			}
390 		}
391 	} else {
392 		/*
393 		 * Save end time of charging to maintain fully charged state
394 		 * of battery after full-batt.
395 		 */
396 		cm->charging_start_time = 0;
397 		cm->charging_end_time = ktime_to_ms(ktime_get());
398 
399 		for (i = 0 ; i < desc->num_charger_regulators ; i++) {
400 			if (desc->charger_regulators[i].externally_control)
401 				continue;
402 
403 			err = regulator_disable(desc->charger_regulators[i].consumer);
404 			if (err < 0) {
405 				dev_warn(cm->dev, "Cannot disable %s regulator\n",
406 					 desc->charger_regulators[i].regulator_name);
407 			}
408 		}
409 
410 		/*
411 		 * Abnormal battery state - Stop charging forcibly,
412 		 * even if charger was enabled at the other places
413 		 */
414 		for (i = 0; i < desc->num_charger_regulators; i++) {
415 			if (regulator_is_enabled(
416 				    desc->charger_regulators[i].consumer)) {
417 				regulator_force_disable(
418 					desc->charger_regulators[i].consumer);
419 				dev_warn(cm->dev, "Disable regulator(%s) forcibly\n",
420 					 desc->charger_regulators[i].regulator_name);
421 			}
422 		}
423 	}
424 
425 	if (!err)
426 		cm->charger_enabled = enable;
427 
428 	return err;
429 }
430 
431 /**
432  * try_charger_restart - Restart charging.
433  * @cm: the Charger Manager representing the battery.
434  *
435  * Restart charging by turning off and on the charger.
436  */
437 static int try_charger_restart(struct charger_manager *cm)
438 {
439 	int err;
440 
441 	if (cm->emergency_stop)
442 		return -EAGAIN;
443 
444 	err = try_charger_enable(cm, false);
445 	if (err)
446 		return err;
447 
448 	return try_charger_enable(cm, true);
449 }
450 
451 /**
452  * uevent_notify - Let users know something has changed.
453  * @cm: the Charger Manager representing the battery.
454  * @event: the event string.
455  *
456  * If @event is null, it implies that uevent_notify is called
457  * by resume function. When called in the resume function, cm_suspended
458  * should be already reset to false in order to let uevent_notify
459  * notify the recent event during the suspend to users. While
460  * suspended, uevent_notify does not notify users, but tracks
461  * events so that uevent_notify can notify users later after resumed.
462  */
463 static void uevent_notify(struct charger_manager *cm, const char *event)
464 {
465 	static char env_str[UEVENT_BUF_SIZE + 1] = "";
466 	static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
467 
468 	if (cm_suspended) {
469 		/* Nothing in suspended-event buffer */
470 		if (env_str_save[0] == 0) {
471 			if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
472 				return; /* status not changed */
473 			strncpy(env_str_save, event, UEVENT_BUF_SIZE);
474 			return;
475 		}
476 
477 		if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
478 			return; /* Duplicated. */
479 		strncpy(env_str_save, event, UEVENT_BUF_SIZE);
480 		return;
481 	}
482 
483 	if (event == NULL) {
484 		/* No messages pending */
485 		if (!env_str_save[0])
486 			return;
487 
488 		strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
489 		kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
490 		env_str_save[0] = 0;
491 
492 		return;
493 	}
494 
495 	/* status not changed */
496 	if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
497 		return;
498 
499 	/* save the status and notify the update */
500 	strncpy(env_str, event, UEVENT_BUF_SIZE);
501 	kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
502 
503 	dev_info(cm->dev, "%s\n", event);
504 }
505 
506 /**
507  * fullbatt_vchk - Check voltage drop some times after "FULL" event.
508  * @work: the work_struct appointing the function
509  *
510  * If a user has designated "fullbatt_vchkdrop_ms/uV" values with
511  * charger_desc, Charger Manager checks voltage drop after the battery
512  * "FULL" event. It checks whether the voltage has dropped more than
513  * fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
514  */
515 static void fullbatt_vchk(struct work_struct *work)
516 {
517 	struct delayed_work *dwork = to_delayed_work(work);
518 	struct charger_manager *cm = container_of(dwork,
519 			struct charger_manager, fullbatt_vchk_work);
520 	struct charger_desc *desc = cm->desc;
521 	int batt_uV, err, diff;
522 
523 	/* remove the appointment for fullbatt_vchk */
524 	cm->fullbatt_vchk_jiffies_at = 0;
525 
526 	if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
527 		return;
528 
529 	err = get_batt_uV(cm, &batt_uV);
530 	if (err) {
531 		dev_err(cm->dev, "%s: get_batt_uV error(%d)\n", __func__, err);
532 		return;
533 	}
534 
535 	diff = desc->fullbatt_uV - batt_uV;
536 	if (diff < 0)
537 		return;
538 
539 	dev_info(cm->dev, "VBATT dropped %duV after full-batt\n", diff);
540 
541 	if (diff > desc->fullbatt_vchkdrop_uV) {
542 		try_charger_restart(cm);
543 		uevent_notify(cm, "Recharging");
544 	}
545 }
546 
547 /**
548  * check_charging_duration - Monitor charging/discharging duration
549  * @cm: the Charger Manager representing the battery.
550  *
551  * If whole charging duration exceed 'charging_max_duration_ms',
552  * cm stop charging to prevent overcharge/overheat. If discharging
553  * duration exceed 'discharging _max_duration_ms', charger cable is
554  * attached, after full-batt, cm start charging to maintain fully
555  * charged state for battery.
556  */
557 static int check_charging_duration(struct charger_manager *cm)
558 {
559 	struct charger_desc *desc = cm->desc;
560 	u64 curr = ktime_to_ms(ktime_get());
561 	u64 duration;
562 	int ret = false;
563 
564 	if (!desc->charging_max_duration_ms &&
565 			!desc->discharging_max_duration_ms)
566 		return ret;
567 
568 	if (cm->charger_enabled) {
569 		duration = curr - cm->charging_start_time;
570 
571 		if (duration > desc->charging_max_duration_ms) {
572 			dev_info(cm->dev, "Charging duration exceed %ums\n",
573 				 desc->charging_max_duration_ms);
574 			uevent_notify(cm, "Discharging");
575 			try_charger_enable(cm, false);
576 			ret = true;
577 		}
578 	} else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
579 		duration = curr - cm->charging_end_time;
580 
581 		if (duration > desc->charging_max_duration_ms &&
582 				is_ext_pwr_online(cm)) {
583 			dev_info(cm->dev, "Discharging duration exceed %ums\n",
584 				 desc->discharging_max_duration_ms);
585 			uevent_notify(cm, "Recharging");
586 			try_charger_enable(cm, true);
587 			ret = true;
588 		}
589 	}
590 
591 	return ret;
592 }
593 
594 static int cm_get_battery_temperature_by_psy(struct charger_manager *cm,
595 					int *temp)
596 {
597 	struct power_supply *fuel_gauge;
598 	int ret;
599 
600 	fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
601 	if (!fuel_gauge)
602 		return -ENODEV;
603 
604 	ret = power_supply_get_property(fuel_gauge,
605 				POWER_SUPPLY_PROP_TEMP,
606 				(union power_supply_propval *)temp);
607 	power_supply_put(fuel_gauge);
608 
609 	return ret;
610 }
611 
612 static int cm_get_battery_temperature(struct charger_manager *cm,
613 					int *temp)
614 {
615 	int ret;
616 
617 	if (!cm->desc->measure_battery_temp)
618 		return -ENODEV;
619 
620 #ifdef CONFIG_THERMAL
621 	if (cm->tzd_batt) {
622 		ret = thermal_zone_get_temp(cm->tzd_batt, temp);
623 		if (!ret)
624 			/* Calibrate temperature unit */
625 			*temp /= 100;
626 	} else
627 #endif
628 	{
629 		/* if-else continued from CONFIG_THERMAL */
630 		ret = cm_get_battery_temperature_by_psy(cm, temp);
631 	}
632 
633 	return ret;
634 }
635 
636 static int cm_check_thermal_status(struct charger_manager *cm)
637 {
638 	struct charger_desc *desc = cm->desc;
639 	int temp, upper_limit, lower_limit;
640 	int ret = 0;
641 
642 	ret = cm_get_battery_temperature(cm, &temp);
643 	if (ret) {
644 		/* FIXME:
645 		 * No information of battery temperature might
646 		 * occur hazadous result. We have to handle it
647 		 * depending on battery type.
648 		 */
649 		dev_err(cm->dev, "Failed to get battery temperature\n");
650 		return 0;
651 	}
652 
653 	upper_limit = desc->temp_max;
654 	lower_limit = desc->temp_min;
655 
656 	if (cm->emergency_stop) {
657 		upper_limit -= desc->temp_diff;
658 		lower_limit += desc->temp_diff;
659 	}
660 
661 	if (temp > upper_limit)
662 		ret = CM_EVENT_BATT_OVERHEAT;
663 	else if (temp < lower_limit)
664 		ret = CM_EVENT_BATT_COLD;
665 
666 	return ret;
667 }
668 
669 /**
670  * _cm_monitor - Monitor the temperature and return true for exceptions.
671  * @cm: the Charger Manager representing the battery.
672  *
673  * Returns true if there is an event to notify for the battery.
674  * (True if the status of "emergency_stop" changes)
675  */
676 static bool _cm_monitor(struct charger_manager *cm)
677 {
678 	int temp_alrt;
679 
680 	temp_alrt = cm_check_thermal_status(cm);
681 
682 	/* It has been stopped already */
683 	if (temp_alrt && cm->emergency_stop)
684 		return false;
685 
686 	/*
687 	 * Check temperature whether overheat or cold.
688 	 * If temperature is out of range normal state, stop charging.
689 	 */
690 	if (temp_alrt) {
691 		cm->emergency_stop = temp_alrt;
692 		if (!try_charger_enable(cm, false))
693 			uevent_notify(cm, default_event_names[temp_alrt]);
694 
695 	/*
696 	 * Check whole charging duration and discharing duration
697 	 * after full-batt.
698 	 */
699 	} else if (!cm->emergency_stop && check_charging_duration(cm)) {
700 		dev_dbg(cm->dev,
701 			"Charging/Discharging duration is out of range\n");
702 	/*
703 	 * Check dropped voltage of battery. If battery voltage is more
704 	 * dropped than fullbatt_vchkdrop_uV after fully charged state,
705 	 * charger-manager have to recharge battery.
706 	 */
707 	} else if (!cm->emergency_stop && is_ext_pwr_online(cm) &&
708 			!cm->charger_enabled) {
709 		fullbatt_vchk(&cm->fullbatt_vchk_work.work);
710 
711 	/*
712 	 * Check whether fully charged state to protect overcharge
713 	 * if charger-manager is charging for battery.
714 	 */
715 	} else if (!cm->emergency_stop && is_full_charged(cm) &&
716 			cm->charger_enabled) {
717 		dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
718 		uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
719 
720 		try_charger_enable(cm, false);
721 
722 		fullbatt_vchk(&cm->fullbatt_vchk_work.work);
723 	} else {
724 		cm->emergency_stop = 0;
725 		if (is_ext_pwr_online(cm)) {
726 			if (!try_charger_enable(cm, true))
727 				uevent_notify(cm, "CHARGING");
728 		}
729 	}
730 
731 	return true;
732 }
733 
734 /**
735  * cm_monitor - Monitor every battery.
736  *
737  * Returns true if there is an event to notify from any of the batteries.
738  * (True if the status of "emergency_stop" changes)
739  */
740 static bool cm_monitor(void)
741 {
742 	bool stop = false;
743 	struct charger_manager *cm;
744 
745 	mutex_lock(&cm_list_mtx);
746 
747 	list_for_each_entry(cm, &cm_list, entry) {
748 		if (_cm_monitor(cm))
749 			stop = true;
750 	}
751 
752 	mutex_unlock(&cm_list_mtx);
753 
754 	return stop;
755 }
756 
757 /**
758  * _setup_polling - Setup the next instance of polling.
759  * @work: work_struct of the function _setup_polling.
760  */
761 static void _setup_polling(struct work_struct *work)
762 {
763 	unsigned long min = ULONG_MAX;
764 	struct charger_manager *cm;
765 	bool keep_polling = false;
766 	unsigned long _next_polling;
767 
768 	mutex_lock(&cm_list_mtx);
769 
770 	list_for_each_entry(cm, &cm_list, entry) {
771 		if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
772 			keep_polling = true;
773 
774 			if (min > cm->desc->polling_interval_ms)
775 				min = cm->desc->polling_interval_ms;
776 		}
777 	}
778 
779 	polling_jiffy = msecs_to_jiffies(min);
780 	if (polling_jiffy <= CM_JIFFIES_SMALL)
781 		polling_jiffy = CM_JIFFIES_SMALL + 1;
782 
783 	if (!keep_polling)
784 		polling_jiffy = ULONG_MAX;
785 	if (polling_jiffy == ULONG_MAX)
786 		goto out;
787 
788 	WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
789 			    ". try it later. %s\n", __func__);
790 
791 	/*
792 	 * Use mod_delayed_work() iff the next polling interval should
793 	 * occur before the currently scheduled one.  If @cm_monitor_work
794 	 * isn't active, the end result is the same, so no need to worry
795 	 * about stale @next_polling.
796 	 */
797 	_next_polling = jiffies + polling_jiffy;
798 
799 	if (time_before(_next_polling, next_polling)) {
800 		mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
801 		next_polling = _next_polling;
802 	} else {
803 		if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
804 			next_polling = _next_polling;
805 	}
806 out:
807 	mutex_unlock(&cm_list_mtx);
808 }
809 static DECLARE_WORK(setup_polling, _setup_polling);
810 
811 /**
812  * cm_monitor_poller - The Monitor / Poller.
813  * @work: work_struct of the function cm_monitor_poller
814  *
815  * During non-suspended state, cm_monitor_poller is used to poll and monitor
816  * the batteries.
817  */
818 static void cm_monitor_poller(struct work_struct *work)
819 {
820 	cm_monitor();
821 	schedule_work(&setup_polling);
822 }
823 
824 /**
825  * fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
826  * @cm: the Charger Manager representing the battery.
827  */
828 static void fullbatt_handler(struct charger_manager *cm)
829 {
830 	struct charger_desc *desc = cm->desc;
831 
832 	if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
833 		goto out;
834 
835 	if (cm_suspended)
836 		device_set_wakeup_capable(cm->dev, true);
837 
838 	mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
839 			 msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
840 	cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
841 				       desc->fullbatt_vchkdrop_ms);
842 
843 	if (cm->fullbatt_vchk_jiffies_at == 0)
844 		cm->fullbatt_vchk_jiffies_at = 1;
845 
846 out:
847 	dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
848 	uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
849 }
850 
851 /**
852  * battout_handler - Event handler for CM_EVENT_BATT_OUT
853  * @cm: the Charger Manager representing the battery.
854  */
855 static void battout_handler(struct charger_manager *cm)
856 {
857 	if (cm_suspended)
858 		device_set_wakeup_capable(cm->dev, true);
859 
860 	if (!is_batt_present(cm)) {
861 		dev_emerg(cm->dev, "Battery Pulled Out!\n");
862 		uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
863 	} else {
864 		uevent_notify(cm, "Battery Reinserted?");
865 	}
866 }
867 
868 /**
869  * misc_event_handler - Handler for other evnets
870  * @cm: the Charger Manager representing the battery.
871  * @type: the Charger Manager representing the battery.
872  */
873 static void misc_event_handler(struct charger_manager *cm,
874 			enum cm_event_types type)
875 {
876 	if (cm_suspended)
877 		device_set_wakeup_capable(cm->dev, true);
878 
879 	if (is_polling_required(cm) && cm->desc->polling_interval_ms)
880 		schedule_work(&setup_polling);
881 	uevent_notify(cm, default_event_names[type]);
882 }
883 
884 static int charger_get_property(struct power_supply *psy,
885 		enum power_supply_property psp,
886 		union power_supply_propval *val)
887 {
888 	struct charger_manager *cm = power_supply_get_drvdata(psy);
889 	struct charger_desc *desc = cm->desc;
890 	struct power_supply *fuel_gauge = NULL;
891 	int ret = 0;
892 	int uV;
893 
894 	switch (psp) {
895 	case POWER_SUPPLY_PROP_STATUS:
896 		if (is_charging(cm))
897 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
898 		else if (is_ext_pwr_online(cm))
899 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
900 		else
901 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
902 		break;
903 	case POWER_SUPPLY_PROP_HEALTH:
904 		if (cm->emergency_stop > 0)
905 			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
906 		else if (cm->emergency_stop < 0)
907 			val->intval = POWER_SUPPLY_HEALTH_COLD;
908 		else
909 			val->intval = POWER_SUPPLY_HEALTH_GOOD;
910 		break;
911 	case POWER_SUPPLY_PROP_PRESENT:
912 		if (is_batt_present(cm))
913 			val->intval = 1;
914 		else
915 			val->intval = 0;
916 		break;
917 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
918 		ret = get_batt_uV(cm, &val->intval);
919 		break;
920 	case POWER_SUPPLY_PROP_CURRENT_NOW:
921 		fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
922 		if (!fuel_gauge) {
923 			ret = -ENODEV;
924 			break;
925 		}
926 		ret = power_supply_get_property(fuel_gauge,
927 				POWER_SUPPLY_PROP_CURRENT_NOW, val);
928 		break;
929 	case POWER_SUPPLY_PROP_TEMP:
930 	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
931 		return cm_get_battery_temperature(cm, &val->intval);
932 	case POWER_SUPPLY_PROP_CAPACITY:
933 		if (!is_batt_present(cm)) {
934 			/* There is no battery. Assume 100% */
935 			val->intval = 100;
936 			break;
937 		}
938 
939 		fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
940 		if (!fuel_gauge) {
941 			ret = -ENODEV;
942 			break;
943 		}
944 
945 		ret = power_supply_get_property(fuel_gauge,
946 					POWER_SUPPLY_PROP_CAPACITY, val);
947 		if (ret)
948 			break;
949 
950 		if (val->intval > 100) {
951 			val->intval = 100;
952 			break;
953 		}
954 		if (val->intval < 0)
955 			val->intval = 0;
956 
957 		/* Do not adjust SOC when charging: voltage is overrated */
958 		if (is_charging(cm))
959 			break;
960 
961 		/*
962 		 * If the capacity value is inconsistent, calibrate it base on
963 		 * the battery voltage values and the thresholds given as desc
964 		 */
965 		ret = get_batt_uV(cm, &uV);
966 		if (ret) {
967 			/* Voltage information not available. No calibration */
968 			ret = 0;
969 			break;
970 		}
971 
972 		if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
973 		    !is_charging(cm)) {
974 			val->intval = 100;
975 			break;
976 		}
977 
978 		break;
979 	case POWER_SUPPLY_PROP_ONLINE:
980 		if (is_ext_pwr_online(cm))
981 			val->intval = 1;
982 		else
983 			val->intval = 0;
984 		break;
985 	case POWER_SUPPLY_PROP_CHARGE_FULL:
986 		if (is_full_charged(cm))
987 			val->intval = 1;
988 		else
989 			val->intval = 0;
990 		ret = 0;
991 		break;
992 	case POWER_SUPPLY_PROP_CHARGE_NOW:
993 		if (is_charging(cm)) {
994 			fuel_gauge = power_supply_get_by_name(
995 					cm->desc->psy_fuel_gauge);
996 			if (!fuel_gauge) {
997 				ret = -ENODEV;
998 				break;
999 			}
1000 
1001 			ret = power_supply_get_property(fuel_gauge,
1002 						POWER_SUPPLY_PROP_CHARGE_NOW,
1003 						val);
1004 			if (ret) {
1005 				val->intval = 1;
1006 				ret = 0;
1007 			} else {
1008 				/* If CHARGE_NOW is supplied, use it */
1009 				val->intval = (val->intval > 0) ?
1010 						val->intval : 1;
1011 			}
1012 		} else {
1013 			val->intval = 0;
1014 		}
1015 		break;
1016 	default:
1017 		return -EINVAL;
1018 	}
1019 	if (fuel_gauge)
1020 		power_supply_put(fuel_gauge);
1021 	return ret;
1022 }
1023 
1024 #define NUM_CHARGER_PSY_OPTIONAL	(4)
1025 static enum power_supply_property default_charger_props[] = {
1026 	/* Guaranteed to provide */
1027 	POWER_SUPPLY_PROP_STATUS,
1028 	POWER_SUPPLY_PROP_HEALTH,
1029 	POWER_SUPPLY_PROP_PRESENT,
1030 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
1031 	POWER_SUPPLY_PROP_CAPACITY,
1032 	POWER_SUPPLY_PROP_ONLINE,
1033 	POWER_SUPPLY_PROP_CHARGE_FULL,
1034 	/*
1035 	 * Optional properties are:
1036 	 * POWER_SUPPLY_PROP_CHARGE_NOW,
1037 	 * POWER_SUPPLY_PROP_CURRENT_NOW,
1038 	 * POWER_SUPPLY_PROP_TEMP, and
1039 	 * POWER_SUPPLY_PROP_TEMP_AMBIENT,
1040 	 */
1041 };
1042 
1043 static const struct power_supply_desc psy_default = {
1044 	.name = "battery",
1045 	.type = POWER_SUPPLY_TYPE_BATTERY,
1046 	.properties = default_charger_props,
1047 	.num_properties = ARRAY_SIZE(default_charger_props),
1048 	.get_property = charger_get_property,
1049 	.no_thermal = true,
1050 };
1051 
1052 /**
1053  * cm_setup_timer - For in-suspend monitoring setup wakeup alarm
1054  *		    for suspend_again.
1055  *
1056  * Returns true if the alarm is set for Charger Manager to use.
1057  * Returns false if
1058  *	cm_setup_timer fails to set an alarm,
1059  *	cm_setup_timer does not need to set an alarm for Charger Manager,
1060  *	or an alarm previously configured is to be used.
1061  */
1062 static bool cm_setup_timer(void)
1063 {
1064 	struct charger_manager *cm;
1065 	unsigned int wakeup_ms = UINT_MAX;
1066 	int timer_req = 0;
1067 
1068 	if (time_after(next_polling, jiffies))
1069 		CM_MIN_VALID(wakeup_ms,
1070 			jiffies_to_msecs(next_polling - jiffies));
1071 
1072 	mutex_lock(&cm_list_mtx);
1073 	list_for_each_entry(cm, &cm_list, entry) {
1074 		unsigned int fbchk_ms = 0;
1075 
1076 		/* fullbatt_vchk is required. setup timer for that */
1077 		if (cm->fullbatt_vchk_jiffies_at) {
1078 			fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
1079 						    - jiffies);
1080 			if (time_is_before_eq_jiffies(
1081 				cm->fullbatt_vchk_jiffies_at) ||
1082 				msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
1083 				fullbatt_vchk(&cm->fullbatt_vchk_work.work);
1084 				fbchk_ms = 0;
1085 			}
1086 		}
1087 		CM_MIN_VALID(wakeup_ms, fbchk_ms);
1088 
1089 		/* Skip if polling is not required for this CM */
1090 		if (!is_polling_required(cm) && !cm->emergency_stop)
1091 			continue;
1092 		timer_req++;
1093 		if (cm->desc->polling_interval_ms == 0)
1094 			continue;
1095 		CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
1096 	}
1097 	mutex_unlock(&cm_list_mtx);
1098 
1099 	if (timer_req && cm_timer) {
1100 		ktime_t now, add;
1101 
1102 		/*
1103 		 * Set alarm with the polling interval (wakeup_ms)
1104 		 * The alarm time should be NOW + CM_RTC_SMALL or later.
1105 		 */
1106 		if (wakeup_ms == UINT_MAX ||
1107 			wakeup_ms < CM_RTC_SMALL * MSEC_PER_SEC)
1108 			wakeup_ms = 2 * CM_RTC_SMALL * MSEC_PER_SEC;
1109 
1110 		pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
1111 
1112 		now = ktime_get_boottime();
1113 		add = ktime_set(wakeup_ms / MSEC_PER_SEC,
1114 				(wakeup_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
1115 		alarm_start(cm_timer, ktime_add(now, add));
1116 
1117 		cm_suspend_duration_ms = wakeup_ms;
1118 
1119 		return true;
1120 	}
1121 	return false;
1122 }
1123 
1124 /**
1125  * charger_extcon_work - enable/diable charger according to the state
1126  *			of charger cable
1127  *
1128  * @work: work_struct of the function charger_extcon_work.
1129  */
1130 static void charger_extcon_work(struct work_struct *work)
1131 {
1132 	struct charger_cable *cable =
1133 			container_of(work, struct charger_cable, wq);
1134 	int ret;
1135 
1136 	if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
1137 		ret = regulator_set_current_limit(cable->charger->consumer,
1138 					cable->min_uA, cable->max_uA);
1139 		if (ret < 0) {
1140 			pr_err("Cannot set current limit of %s (%s)\n",
1141 			       cable->charger->regulator_name, cable->name);
1142 			return;
1143 		}
1144 
1145 		pr_info("Set current limit of %s : %duA ~ %duA\n",
1146 			cable->charger->regulator_name,
1147 			cable->min_uA, cable->max_uA);
1148 	}
1149 
1150 	try_charger_enable(cable->cm, cable->attached);
1151 }
1152 
1153 /**
1154  * charger_extcon_notifier - receive the state of charger cable
1155  *			when registered cable is attached or detached.
1156  *
1157  * @self: the notifier block of the charger_extcon_notifier.
1158  * @event: the cable state.
1159  * @ptr: the data pointer of notifier block.
1160  */
1161 static int charger_extcon_notifier(struct notifier_block *self,
1162 			unsigned long event, void *ptr)
1163 {
1164 	struct charger_cable *cable =
1165 		container_of(self, struct charger_cable, nb);
1166 
1167 	/*
1168 	 * The newly state of charger cable.
1169 	 * If cable is attached, cable->attached is true.
1170 	 */
1171 	cable->attached = event;
1172 
1173 	/*
1174 	 * Setup monitoring to check battery state
1175 	 * when charger cable is attached.
1176 	 */
1177 	if (cable->attached && is_polling_required(cable->cm)) {
1178 		cancel_work_sync(&setup_polling);
1179 		schedule_work(&setup_polling);
1180 	}
1181 
1182 	/*
1183 	 * Setup work for controlling charger(regulator)
1184 	 * according to charger cable.
1185 	 */
1186 	schedule_work(&cable->wq);
1187 
1188 	return NOTIFY_DONE;
1189 }
1190 
1191 /**
1192  * charger_extcon_init - register external connector to use it
1193  *			as the charger cable
1194  *
1195  * @cm: the Charger Manager representing the battery.
1196  * @cable: the Charger cable representing the external connector.
1197  */
1198 static int charger_extcon_init(struct charger_manager *cm,
1199 		struct charger_cable *cable)
1200 {
1201 	int ret;
1202 
1203 	/*
1204 	 * Charger manager use Extcon framework to identify
1205 	 * the charger cable among various external connector
1206 	 * cable (e.g., TA, USB, MHL, Dock).
1207 	 */
1208 	INIT_WORK(&cable->wq, charger_extcon_work);
1209 	cable->nb.notifier_call = charger_extcon_notifier;
1210 	ret = extcon_register_interest(&cable->extcon_dev,
1211 			cable->extcon_name, cable->name, &cable->nb);
1212 	if (ret < 0) {
1213 		pr_info("Cannot register extcon_dev for %s(cable: %s)\n",
1214 			cable->extcon_name, cable->name);
1215 		ret = -EINVAL;
1216 	}
1217 
1218 	return ret;
1219 }
1220 
1221 /**
1222  * charger_manager_register_extcon - Register extcon device to recevie state
1223  *				     of charger cable.
1224  * @cm: the Charger Manager representing the battery.
1225  *
1226  * This function support EXTCON(External Connector) subsystem to detect the
1227  * state of charger cables for enabling or disabling charger(regulator) and
1228  * select the charger cable for charging among a number of external cable
1229  * according to policy of H/W board.
1230  */
1231 static int charger_manager_register_extcon(struct charger_manager *cm)
1232 {
1233 	struct charger_desc *desc = cm->desc;
1234 	struct charger_regulator *charger;
1235 	int ret;
1236 	int i;
1237 	int j;
1238 
1239 	for (i = 0; i < desc->num_charger_regulators; i++) {
1240 		charger = &desc->charger_regulators[i];
1241 
1242 		charger->consumer = regulator_get(cm->dev,
1243 					charger->regulator_name);
1244 		if (IS_ERR(charger->consumer)) {
1245 			dev_err(cm->dev, "Cannot find charger(%s)\n",
1246 				charger->regulator_name);
1247 			return PTR_ERR(charger->consumer);
1248 		}
1249 		charger->cm = cm;
1250 
1251 		for (j = 0; j < charger->num_cables; j++) {
1252 			struct charger_cable *cable = &charger->cables[j];
1253 
1254 			ret = charger_extcon_init(cm, cable);
1255 			if (ret < 0) {
1256 				dev_err(cm->dev, "Cannot initialize charger(%s)\n",
1257 					charger->regulator_name);
1258 				return ret;
1259 			}
1260 			cable->charger = charger;
1261 			cable->cm = cm;
1262 		}
1263 	}
1264 
1265 	return 0;
1266 }
1267 
1268 /* help function of sysfs node to control charger(regulator) */
1269 static ssize_t charger_name_show(struct device *dev,
1270 				struct device_attribute *attr, char *buf)
1271 {
1272 	struct charger_regulator *charger
1273 		= container_of(attr, struct charger_regulator, attr_name);
1274 
1275 	return sprintf(buf, "%s\n", charger->regulator_name);
1276 }
1277 
1278 static ssize_t charger_state_show(struct device *dev,
1279 				struct device_attribute *attr, char *buf)
1280 {
1281 	struct charger_regulator *charger
1282 		= container_of(attr, struct charger_regulator, attr_state);
1283 	int state = 0;
1284 
1285 	if (!charger->externally_control)
1286 		state = regulator_is_enabled(charger->consumer);
1287 
1288 	return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
1289 }
1290 
1291 static ssize_t charger_externally_control_show(struct device *dev,
1292 				struct device_attribute *attr, char *buf)
1293 {
1294 	struct charger_regulator *charger = container_of(attr,
1295 			struct charger_regulator, attr_externally_control);
1296 
1297 	return sprintf(buf, "%d\n", charger->externally_control);
1298 }
1299 
1300 static ssize_t charger_externally_control_store(struct device *dev,
1301 				struct device_attribute *attr, const char *buf,
1302 				size_t count)
1303 {
1304 	struct charger_regulator *charger
1305 		= container_of(attr, struct charger_regulator,
1306 					attr_externally_control);
1307 	struct charger_manager *cm = charger->cm;
1308 	struct charger_desc *desc = cm->desc;
1309 	int i;
1310 	int ret;
1311 	int externally_control;
1312 	int chargers_externally_control = 1;
1313 
1314 	ret = sscanf(buf, "%d", &externally_control);
1315 	if (ret == 0) {
1316 		ret = -EINVAL;
1317 		return ret;
1318 	}
1319 
1320 	if (!externally_control) {
1321 		charger->externally_control = 0;
1322 		return count;
1323 	}
1324 
1325 	for (i = 0; i < desc->num_charger_regulators; i++) {
1326 		if (&desc->charger_regulators[i] != charger &&
1327 			!desc->charger_regulators[i].externally_control) {
1328 			/*
1329 			 * At least, one charger is controlled by
1330 			 * charger-manager
1331 			 */
1332 			chargers_externally_control = 0;
1333 			break;
1334 		}
1335 	}
1336 
1337 	if (!chargers_externally_control) {
1338 		if (cm->charger_enabled) {
1339 			try_charger_enable(charger->cm, false);
1340 			charger->externally_control = externally_control;
1341 			try_charger_enable(charger->cm, true);
1342 		} else {
1343 			charger->externally_control = externally_control;
1344 		}
1345 	} else {
1346 		dev_warn(cm->dev,
1347 			 "'%s' regulator should be controlled in charger-manager because charger-manager must need at least one charger for charging\n",
1348 			 charger->regulator_name);
1349 	}
1350 
1351 	return count;
1352 }
1353 
1354 /**
1355  * charger_manager_register_sysfs - Register sysfs entry for each charger
1356  * @cm: the Charger Manager representing the battery.
1357  *
1358  * This function add sysfs entry for charger(regulator) to control charger from
1359  * user-space. If some development board use one more chargers for charging
1360  * but only need one charger on specific case which is dependent on user
1361  * scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
1362  * class/power_supply/battery/charger.[index]/externally_control'. For example,
1363  * if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
1364  * externally_control, this charger isn't controlled from charger-manager and
1365  * always stay off state of regulator.
1366  */
1367 static int charger_manager_register_sysfs(struct charger_manager *cm)
1368 {
1369 	struct charger_desc *desc = cm->desc;
1370 	struct charger_regulator *charger;
1371 	int chargers_externally_control = 1;
1372 	char buf[11];
1373 	char *str;
1374 	int ret;
1375 	int i;
1376 
1377 	/* Create sysfs entry to control charger(regulator) */
1378 	for (i = 0; i < desc->num_charger_regulators; i++) {
1379 		charger = &desc->charger_regulators[i];
1380 
1381 		snprintf(buf, 10, "charger.%d", i);
1382 		str = devm_kzalloc(cm->dev,
1383 				sizeof(char) * (strlen(buf) + 1), GFP_KERNEL);
1384 		if (!str)
1385 			return -ENOMEM;
1386 
1387 		strcpy(str, buf);
1388 
1389 		charger->attrs[0] = &charger->attr_name.attr;
1390 		charger->attrs[1] = &charger->attr_state.attr;
1391 		charger->attrs[2] = &charger->attr_externally_control.attr;
1392 		charger->attrs[3] = NULL;
1393 		charger->attr_g.name = str;
1394 		charger->attr_g.attrs = charger->attrs;
1395 
1396 		sysfs_attr_init(&charger->attr_name.attr);
1397 		charger->attr_name.attr.name = "name";
1398 		charger->attr_name.attr.mode = 0444;
1399 		charger->attr_name.show = charger_name_show;
1400 
1401 		sysfs_attr_init(&charger->attr_state.attr);
1402 		charger->attr_state.attr.name = "state";
1403 		charger->attr_state.attr.mode = 0444;
1404 		charger->attr_state.show = charger_state_show;
1405 
1406 		sysfs_attr_init(&charger->attr_externally_control.attr);
1407 		charger->attr_externally_control.attr.name
1408 				= "externally_control";
1409 		charger->attr_externally_control.attr.mode = 0644;
1410 		charger->attr_externally_control.show
1411 				= charger_externally_control_show;
1412 		charger->attr_externally_control.store
1413 				= charger_externally_control_store;
1414 
1415 		if (!desc->charger_regulators[i].externally_control ||
1416 				!chargers_externally_control)
1417 			chargers_externally_control = 0;
1418 
1419 		dev_info(cm->dev, "'%s' regulator's externally_control is %d\n",
1420 			 charger->regulator_name, charger->externally_control);
1421 
1422 		ret = sysfs_create_group(&cm->charger_psy->dev.kobj,
1423 					&charger->attr_g);
1424 		if (ret < 0) {
1425 			dev_err(cm->dev, "Cannot create sysfs entry of %s regulator\n",
1426 				charger->regulator_name);
1427 			return ret;
1428 		}
1429 	}
1430 
1431 	if (chargers_externally_control) {
1432 		dev_err(cm->dev, "Cannot register regulator because charger-manager must need at least one charger for charging battery\n");
1433 		return -EINVAL;
1434 	}
1435 
1436 	return 0;
1437 }
1438 
1439 static int cm_init_thermal_data(struct charger_manager *cm,
1440 		struct power_supply *fuel_gauge)
1441 {
1442 	struct charger_desc *desc = cm->desc;
1443 	union power_supply_propval val;
1444 	int ret;
1445 
1446 	/* Verify whether fuel gauge provides battery temperature */
1447 	ret = power_supply_get_property(fuel_gauge,
1448 					POWER_SUPPLY_PROP_TEMP, &val);
1449 
1450 	if (!ret) {
1451 		cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1452 				POWER_SUPPLY_PROP_TEMP;
1453 		cm->charger_psy_desc.num_properties++;
1454 		cm->desc->measure_battery_temp = true;
1455 	}
1456 #ifdef CONFIG_THERMAL
1457 	if (ret && desc->thermal_zone) {
1458 		cm->tzd_batt =
1459 			thermal_zone_get_zone_by_name(desc->thermal_zone);
1460 		if (IS_ERR(cm->tzd_batt))
1461 			return PTR_ERR(cm->tzd_batt);
1462 
1463 		/* Use external thermometer */
1464 		cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1465 				POWER_SUPPLY_PROP_TEMP_AMBIENT;
1466 		cm->charger_psy_desc.num_properties++;
1467 		cm->desc->measure_battery_temp = true;
1468 		ret = 0;
1469 	}
1470 #endif
1471 	if (cm->desc->measure_battery_temp) {
1472 		/* NOTICE : Default allowable minimum charge temperature is 0 */
1473 		if (!desc->temp_max)
1474 			desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX;
1475 		if (!desc->temp_diff)
1476 			desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF;
1477 	}
1478 
1479 	return ret;
1480 }
1481 
1482 static const struct of_device_id charger_manager_match[] = {
1483 	{
1484 		.compatible = "charger-manager",
1485 	},
1486 	{},
1487 };
1488 
1489 static struct charger_desc *of_cm_parse_desc(struct device *dev)
1490 {
1491 	struct charger_desc *desc;
1492 	struct device_node *np = dev->of_node;
1493 	u32 poll_mode = CM_POLL_DISABLE;
1494 	u32 battery_stat = CM_NO_BATTERY;
1495 	int num_chgs = 0;
1496 
1497 	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
1498 	if (!desc)
1499 		return ERR_PTR(-ENOMEM);
1500 
1501 	of_property_read_string(np, "cm-name", &desc->psy_name);
1502 
1503 	of_property_read_u32(np, "cm-poll-mode", &poll_mode);
1504 	desc->polling_mode = poll_mode;
1505 
1506 	of_property_read_u32(np, "cm-poll-interval",
1507 				&desc->polling_interval_ms);
1508 
1509 	of_property_read_u32(np, "cm-fullbatt-vchkdrop-ms",
1510 					&desc->fullbatt_vchkdrop_ms);
1511 	of_property_read_u32(np, "cm-fullbatt-vchkdrop-volt",
1512 					&desc->fullbatt_vchkdrop_uV);
1513 	of_property_read_u32(np, "cm-fullbatt-voltage", &desc->fullbatt_uV);
1514 	of_property_read_u32(np, "cm-fullbatt-soc", &desc->fullbatt_soc);
1515 	of_property_read_u32(np, "cm-fullbatt-capacity",
1516 					&desc->fullbatt_full_capacity);
1517 
1518 	of_property_read_u32(np, "cm-battery-stat", &battery_stat);
1519 	desc->battery_present = battery_stat;
1520 
1521 	/* chargers */
1522 	of_property_read_u32(np, "cm-num-chargers", &num_chgs);
1523 	if (num_chgs) {
1524 		/* Allocate empty bin at the tail of array */
1525 		desc->psy_charger_stat = devm_kzalloc(dev, sizeof(char *)
1526 						* (num_chgs + 1), GFP_KERNEL);
1527 		if (desc->psy_charger_stat) {
1528 			int i;
1529 			for (i = 0; i < num_chgs; i++)
1530 				of_property_read_string_index(np, "cm-chargers",
1531 						i, &desc->psy_charger_stat[i]);
1532 		} else {
1533 			return ERR_PTR(-ENOMEM);
1534 		}
1535 	}
1536 
1537 	of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
1538 
1539 	of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
1540 
1541 	of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
1542 	if (of_get_property(np, "cm-battery-cold-in-minus", NULL))
1543 		desc->temp_min *= -1;
1544 	of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
1545 	of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);
1546 
1547 	of_property_read_u32(np, "cm-charging-max",
1548 				&desc->charging_max_duration_ms);
1549 	of_property_read_u32(np, "cm-discharging-max",
1550 				&desc->discharging_max_duration_ms);
1551 
1552 	/* battery charger regualtors */
1553 	desc->num_charger_regulators = of_get_child_count(np);
1554 	if (desc->num_charger_regulators) {
1555 		struct charger_regulator *chg_regs;
1556 		struct device_node *child;
1557 
1558 		chg_regs = devm_kzalloc(dev, sizeof(*chg_regs)
1559 					* desc->num_charger_regulators,
1560 					GFP_KERNEL);
1561 		if (!chg_regs)
1562 			return ERR_PTR(-ENOMEM);
1563 
1564 		desc->charger_regulators = chg_regs;
1565 
1566 		for_each_child_of_node(np, child) {
1567 			struct charger_cable *cables;
1568 			struct device_node *_child;
1569 
1570 			of_property_read_string(child, "cm-regulator-name",
1571 					&chg_regs->regulator_name);
1572 
1573 			/* charger cables */
1574 			chg_regs->num_cables = of_get_child_count(child);
1575 			if (chg_regs->num_cables) {
1576 				cables = devm_kzalloc(dev, sizeof(*cables)
1577 						* chg_regs->num_cables,
1578 						GFP_KERNEL);
1579 				if (!cables) {
1580 					of_node_put(child);
1581 					return ERR_PTR(-ENOMEM);
1582 				}
1583 
1584 				chg_regs->cables = cables;
1585 
1586 				for_each_child_of_node(child, _child) {
1587 					of_property_read_string(_child,
1588 					"cm-cable-name", &cables->name);
1589 					of_property_read_string(_child,
1590 					"cm-cable-extcon",
1591 					&cables->extcon_name);
1592 					of_property_read_u32(_child,
1593 					"cm-cable-min",
1594 					&cables->min_uA);
1595 					of_property_read_u32(_child,
1596 					"cm-cable-max",
1597 					&cables->max_uA);
1598 					cables++;
1599 				}
1600 			}
1601 			chg_regs++;
1602 		}
1603 	}
1604 	return desc;
1605 }
1606 
1607 static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
1608 {
1609 	if (pdev->dev.of_node)
1610 		return of_cm_parse_desc(&pdev->dev);
1611 	return dev_get_platdata(&pdev->dev);
1612 }
1613 
1614 static enum alarmtimer_restart cm_timer_func(struct alarm *alarm, ktime_t now)
1615 {
1616 	cm_timer_set = false;
1617 	return ALARMTIMER_NORESTART;
1618 }
1619 
1620 static int charger_manager_probe(struct platform_device *pdev)
1621 {
1622 	struct charger_desc *desc = cm_get_drv_data(pdev);
1623 	struct charger_manager *cm;
1624 	int ret, i = 0;
1625 	int j = 0;
1626 	union power_supply_propval val;
1627 	struct power_supply *fuel_gauge;
1628 	struct power_supply_config psy_cfg = {};
1629 
1630 	if (IS_ERR(desc)) {
1631 		dev_err(&pdev->dev, "No platform data (desc) found\n");
1632 		return -ENODEV;
1633 	}
1634 
1635 	cm = devm_kzalloc(&pdev->dev,
1636 			sizeof(struct charger_manager),	GFP_KERNEL);
1637 	if (!cm)
1638 		return -ENOMEM;
1639 
1640 	/* Basic Values. Unspecified are Null or 0 */
1641 	cm->dev = &pdev->dev;
1642 	cm->desc = desc;
1643 	psy_cfg.drv_data = cm;
1644 
1645 	/* Initialize alarm timer */
1646 	if (alarmtimer_get_rtcdev()) {
1647 		cm_timer = devm_kzalloc(cm->dev, sizeof(*cm_timer), GFP_KERNEL);
1648 		alarm_init(cm_timer, ALARM_BOOTTIME, cm_timer_func);
1649 	}
1650 
1651 	/*
1652 	 * The following two do not need to be errors.
1653 	 * Users may intentionally ignore those two features.
1654 	 */
1655 	if (desc->fullbatt_uV == 0) {
1656 		dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
1657 	}
1658 	if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
1659 		dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
1660 		desc->fullbatt_vchkdrop_ms = 0;
1661 		desc->fullbatt_vchkdrop_uV = 0;
1662 	}
1663 	if (desc->fullbatt_soc == 0) {
1664 		dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
1665 	}
1666 	if (desc->fullbatt_full_capacity == 0) {
1667 		dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
1668 	}
1669 
1670 	if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1671 		dev_err(&pdev->dev, "charger_regulators undefined\n");
1672 		return -EINVAL;
1673 	}
1674 
1675 	if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1676 		dev_err(&pdev->dev, "No power supply defined\n");
1677 		return -EINVAL;
1678 	}
1679 
1680 	if (!desc->psy_fuel_gauge) {
1681 		dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
1682 		return -EINVAL;
1683 	}
1684 
1685 	/* Counting index only */
1686 	while (desc->psy_charger_stat[i])
1687 		i++;
1688 
1689 	/* Check if charger's supplies are present at probe */
1690 	for (i = 0; desc->psy_charger_stat[i]; i++) {
1691 		struct power_supply *psy;
1692 
1693 		psy = power_supply_get_by_name(desc->psy_charger_stat[i]);
1694 		if (!psy) {
1695 			dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1696 				desc->psy_charger_stat[i]);
1697 			return -ENODEV;
1698 		}
1699 		power_supply_put(psy);
1700 	}
1701 
1702 	if (desc->polling_interval_ms == 0 ||
1703 	    msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL) {
1704 		dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1705 		return -EINVAL;
1706 	}
1707 
1708 	if (!desc->charging_max_duration_ms ||
1709 			!desc->discharging_max_duration_ms) {
1710 		dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
1711 		desc->charging_max_duration_ms = 0;
1712 		desc->discharging_max_duration_ms = 0;
1713 	}
1714 
1715 	platform_set_drvdata(pdev, cm);
1716 
1717 	memcpy(&cm->charger_psy_desc, &psy_default, sizeof(psy_default));
1718 
1719 	if (!desc->psy_name)
1720 		strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
1721 	else
1722 		strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
1723 	cm->charger_psy_desc.name = cm->psy_name_buf;
1724 
1725 	/* Allocate for psy properties because they may vary */
1726 	cm->charger_psy_desc.properties = devm_kzalloc(&pdev->dev,
1727 				sizeof(enum power_supply_property)
1728 				* (ARRAY_SIZE(default_charger_props) +
1729 				NUM_CHARGER_PSY_OPTIONAL), GFP_KERNEL);
1730 	if (!cm->charger_psy_desc.properties)
1731 		return -ENOMEM;
1732 
1733 	memcpy(cm->charger_psy_desc.properties, default_charger_props,
1734 		sizeof(enum power_supply_property) *
1735 		ARRAY_SIZE(default_charger_props));
1736 	cm->charger_psy_desc.num_properties = psy_default.num_properties;
1737 
1738 	/* Find which optional psy-properties are available */
1739 	fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
1740 	if (!fuel_gauge) {
1741 		dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1742 			desc->psy_fuel_gauge);
1743 		return -ENODEV;
1744 	}
1745 	if (!power_supply_get_property(fuel_gauge,
1746 					  POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
1747 		cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1748 				POWER_SUPPLY_PROP_CHARGE_NOW;
1749 		cm->charger_psy_desc.num_properties++;
1750 	}
1751 	if (!power_supply_get_property(fuel_gauge,
1752 					  POWER_SUPPLY_PROP_CURRENT_NOW,
1753 					  &val)) {
1754 		cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1755 				POWER_SUPPLY_PROP_CURRENT_NOW;
1756 		cm->charger_psy_desc.num_properties++;
1757 	}
1758 
1759 	ret = cm_init_thermal_data(cm, fuel_gauge);
1760 	if (ret) {
1761 		dev_err(&pdev->dev, "Failed to initialize thermal data\n");
1762 		cm->desc->measure_battery_temp = false;
1763 	}
1764 	power_supply_put(fuel_gauge);
1765 
1766 	INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
1767 
1768 	cm->charger_psy = power_supply_register(&pdev->dev,
1769 						&cm->charger_psy_desc,
1770 						&psy_cfg);
1771 	if (IS_ERR(cm->charger_psy)) {
1772 		dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
1773 			cm->charger_psy_desc.name);
1774 		return PTR_ERR(cm->charger_psy);
1775 	}
1776 
1777 	/* Register extcon device for charger cable */
1778 	ret = charger_manager_register_extcon(cm);
1779 	if (ret < 0) {
1780 		dev_err(&pdev->dev, "Cannot initialize extcon device\n");
1781 		goto err_reg_extcon;
1782 	}
1783 
1784 	/* Register sysfs entry for charger(regulator) */
1785 	ret = charger_manager_register_sysfs(cm);
1786 	if (ret < 0) {
1787 		dev_err(&pdev->dev,
1788 			"Cannot initialize sysfs entry of regulator\n");
1789 		goto err_reg_sysfs;
1790 	}
1791 
1792 	/* Add to the list */
1793 	mutex_lock(&cm_list_mtx);
1794 	list_add(&cm->entry, &cm_list);
1795 	mutex_unlock(&cm_list_mtx);
1796 
1797 	/*
1798 	 * Charger-manager is capable of waking up the systme from sleep
1799 	 * when event is happend through cm_notify_event()
1800 	 */
1801 	device_init_wakeup(&pdev->dev, true);
1802 	device_set_wakeup_capable(&pdev->dev, false);
1803 
1804 	/*
1805 	 * Charger-manager have to check the charging state right after
1806 	 * tialization of charger-manager and then update current charging
1807 	 * state.
1808 	 */
1809 	cm_monitor();
1810 
1811 	schedule_work(&setup_polling);
1812 
1813 	return 0;
1814 
1815 err_reg_sysfs:
1816 	for (i = 0; i < desc->num_charger_regulators; i++) {
1817 		struct charger_regulator *charger;
1818 
1819 		charger = &desc->charger_regulators[i];
1820 		sysfs_remove_group(&cm->charger_psy->dev.kobj,
1821 				&charger->attr_g);
1822 	}
1823 err_reg_extcon:
1824 	for (i = 0; i < desc->num_charger_regulators; i++) {
1825 		struct charger_regulator *charger;
1826 
1827 		charger = &desc->charger_regulators[i];
1828 		for (j = 0; j < charger->num_cables; j++) {
1829 			struct charger_cable *cable = &charger->cables[j];
1830 			/* Remove notifier block if only edev exists */
1831 			if (cable->extcon_dev.edev)
1832 				extcon_unregister_interest(&cable->extcon_dev);
1833 		}
1834 
1835 		regulator_put(desc->charger_regulators[i].consumer);
1836 	}
1837 
1838 	power_supply_unregister(cm->charger_psy);
1839 
1840 	return ret;
1841 }
1842 
1843 static int charger_manager_remove(struct platform_device *pdev)
1844 {
1845 	struct charger_manager *cm = platform_get_drvdata(pdev);
1846 	struct charger_desc *desc = cm->desc;
1847 	int i = 0;
1848 	int j = 0;
1849 
1850 	/* Remove from the list */
1851 	mutex_lock(&cm_list_mtx);
1852 	list_del(&cm->entry);
1853 	mutex_unlock(&cm_list_mtx);
1854 
1855 	cancel_work_sync(&setup_polling);
1856 	cancel_delayed_work_sync(&cm_monitor_work);
1857 
1858 	for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1859 		struct charger_regulator *charger
1860 				= &desc->charger_regulators[i];
1861 		for (j = 0 ; j < charger->num_cables ; j++) {
1862 			struct charger_cable *cable = &charger->cables[j];
1863 			extcon_unregister_interest(&cable->extcon_dev);
1864 		}
1865 	}
1866 
1867 	for (i = 0 ; i < desc->num_charger_regulators ; i++)
1868 		regulator_put(desc->charger_regulators[i].consumer);
1869 
1870 	power_supply_unregister(cm->charger_psy);
1871 
1872 	try_charger_enable(cm, false);
1873 
1874 	return 0;
1875 }
1876 
1877 static const struct platform_device_id charger_manager_id[] = {
1878 	{ "charger-manager", 0 },
1879 	{ },
1880 };
1881 MODULE_DEVICE_TABLE(platform, charger_manager_id);
1882 
1883 static int cm_suspend_noirq(struct device *dev)
1884 {
1885 	if (device_may_wakeup(dev)) {
1886 		device_set_wakeup_capable(dev, false);
1887 		return -EAGAIN;
1888 	}
1889 
1890 	return 0;
1891 }
1892 
1893 static bool cm_need_to_awake(void)
1894 {
1895 	struct charger_manager *cm;
1896 
1897 	if (cm_timer)
1898 		return false;
1899 
1900 	mutex_lock(&cm_list_mtx);
1901 	list_for_each_entry(cm, &cm_list, entry) {
1902 		if (is_charging(cm)) {
1903 			mutex_unlock(&cm_list_mtx);
1904 			return true;
1905 		}
1906 	}
1907 	mutex_unlock(&cm_list_mtx);
1908 
1909 	return false;
1910 }
1911 
1912 static int cm_suspend_prepare(struct device *dev)
1913 {
1914 	struct charger_manager *cm = dev_get_drvdata(dev);
1915 
1916 	if (cm_need_to_awake())
1917 		return -EBUSY;
1918 
1919 	if (!cm_suspended)
1920 		cm_suspended = true;
1921 
1922 	cm_timer_set = cm_setup_timer();
1923 
1924 	if (cm_timer_set) {
1925 		cancel_work_sync(&setup_polling);
1926 		cancel_delayed_work_sync(&cm_monitor_work);
1927 		cancel_delayed_work(&cm->fullbatt_vchk_work);
1928 	}
1929 
1930 	return 0;
1931 }
1932 
1933 static void cm_suspend_complete(struct device *dev)
1934 {
1935 	struct charger_manager *cm = dev_get_drvdata(dev);
1936 
1937 	if (cm_suspended)
1938 		cm_suspended = false;
1939 
1940 	if (cm_timer_set) {
1941 		ktime_t remain;
1942 
1943 		alarm_cancel(cm_timer);
1944 		cm_timer_set = false;
1945 		remain = alarm_expires_remaining(cm_timer);
1946 		cm_suspend_duration_ms -= ktime_to_ms(remain);
1947 		schedule_work(&setup_polling);
1948 	}
1949 
1950 	_cm_monitor(cm);
1951 
1952 	/* Re-enqueue delayed work (fullbatt_vchk_work) */
1953 	if (cm->fullbatt_vchk_jiffies_at) {
1954 		unsigned long delay = 0;
1955 		unsigned long now = jiffies + CM_JIFFIES_SMALL;
1956 
1957 		if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
1958 			delay = (unsigned long)((long)now
1959 				- (long)(cm->fullbatt_vchk_jiffies_at));
1960 			delay = jiffies_to_msecs(delay);
1961 		} else {
1962 			delay = 0;
1963 		}
1964 
1965 		/*
1966 		 * Account for cm_suspend_duration_ms with assuming that
1967 		 * timer stops in suspend.
1968 		 */
1969 		if (delay > cm_suspend_duration_ms)
1970 			delay -= cm_suspend_duration_ms;
1971 		else
1972 			delay = 0;
1973 
1974 		queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
1975 				   msecs_to_jiffies(delay));
1976 	}
1977 	device_set_wakeup_capable(cm->dev, false);
1978 }
1979 
1980 static const struct dev_pm_ops charger_manager_pm = {
1981 	.prepare	= cm_suspend_prepare,
1982 	.suspend_noirq	= cm_suspend_noirq,
1983 	.complete	= cm_suspend_complete,
1984 };
1985 
1986 static struct platform_driver charger_manager_driver = {
1987 	.driver = {
1988 		.name = "charger-manager",
1989 		.pm = &charger_manager_pm,
1990 		.of_match_table = charger_manager_match,
1991 	},
1992 	.probe = charger_manager_probe,
1993 	.remove = charger_manager_remove,
1994 	.id_table = charger_manager_id,
1995 };
1996 
1997 static int __init charger_manager_init(void)
1998 {
1999 	cm_wq = create_freezable_workqueue("charger_manager");
2000 	INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
2001 
2002 	return platform_driver_register(&charger_manager_driver);
2003 }
2004 late_initcall(charger_manager_init);
2005 
2006 static void __exit charger_manager_cleanup(void)
2007 {
2008 	destroy_workqueue(cm_wq);
2009 	cm_wq = NULL;
2010 
2011 	platform_driver_unregister(&charger_manager_driver);
2012 }
2013 module_exit(charger_manager_cleanup);
2014 
2015 /**
2016  * cm_notify_event - charger driver notify Charger Manager of charger event
2017  * @psy: pointer to instance of charger's power_supply
2018  * @type: type of charger event
2019  * @msg: optional message passed to uevent_notify fuction
2020  */
2021 void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
2022 		     char *msg)
2023 {
2024 	struct charger_manager *cm;
2025 	bool found_power_supply = false;
2026 
2027 	if (psy == NULL)
2028 		return;
2029 
2030 	mutex_lock(&cm_list_mtx);
2031 	list_for_each_entry(cm, &cm_list, entry) {
2032 		if (match_string(cm->desc->psy_charger_stat, -1,
2033 				 psy->desc->name) >= 0) {
2034 			found_power_supply = true;
2035 			break;
2036 		}
2037 	}
2038 	mutex_unlock(&cm_list_mtx);
2039 
2040 	if (!found_power_supply)
2041 		return;
2042 
2043 	switch (type) {
2044 	case CM_EVENT_BATT_FULL:
2045 		fullbatt_handler(cm);
2046 		break;
2047 	case CM_EVENT_BATT_OUT:
2048 		battout_handler(cm);
2049 		break;
2050 	case CM_EVENT_BATT_IN:
2051 	case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
2052 		misc_event_handler(cm, type);
2053 		break;
2054 	case CM_EVENT_UNKNOWN:
2055 	case CM_EVENT_OTHERS:
2056 		uevent_notify(cm, msg ? msg : default_event_names[type]);
2057 		break;
2058 	default:
2059 		dev_err(cm->dev, "%s: type not specified\n", __func__);
2060 		break;
2061 	}
2062 }
2063 EXPORT_SYMBOL_GPL(cm_notify_event);
2064 
2065 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
2066 MODULE_DESCRIPTION("Charger Manager");
2067 MODULE_LICENSE("GPL");
2068