1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* Copyright (C) 2011 Samsung Electronics Co., Ltd.
4	* MyungJoo Ham <myungjoo.ham@samsung.com>
5	*
6	* This driver enables to monitor battery health and control charger
7	* during suspend-to-mem.
8	* Charger manager depends on other devices. Register this later than
9	* the depending devices.
10	*
11	**/
12
13	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15	#include <linux/io.h>
16	#include <linux/module.h>
17	#include <linux/irq.h>
18	#include <linux/interrupt.h>
19	#include <linux/rtc.h>
20	#include <linux/slab.h>
21	#include <linux/workqueue.h>
22	#include <linux/platform_device.h>
23	#include <linux/power/charger-manager.h>
24	#include <linux/regulator/consumer.h>
25	#include <linux/sysfs.h>
26	#include <linux/of.h>
27	#include <linux/thermal.h>
28
29	static struct {
30	const char *name;
31	u64 extcon_type;
32	} extcon_mapping[] = {
33	/* Current textual representations */
34	{ "USB", EXTCON_USB },
35	{ "USB-HOST", EXTCON_USB_HOST },
36	{ "SDP", EXTCON_CHG_USB_SDP },
37	{ "DCP", EXTCON_CHG_USB_DCP },
38	{ "CDP", EXTCON_CHG_USB_CDP },
39	{ "ACA", EXTCON_CHG_USB_ACA },
40	{ "FAST-CHARGER", EXTCON_CHG_USB_FAST },
41	{ "SLOW-CHARGER", EXTCON_CHG_USB_SLOW },
42	{ "WPT", EXTCON_CHG_WPT },
43	{ "PD", EXTCON_CHG_USB_PD },
44	{ "DOCK", EXTCON_DOCK },
45	{ "JIG", EXTCON_JIG },
46	{ "MECHANICAL", EXTCON_MECHANICAL },
47	/* Deprecated textual representations */
48	{ "TA", EXTCON_CHG_USB_SDP },
49	{ "CHARGE-DOWNSTREAM", EXTCON_CHG_USB_CDP },
50	};
51
52	/*
53	* Default temperature threshold for charging.
54	* Every temperature units are in tenth of centigrade.
55	*/
56	#define CM_DEFAULT_RECHARGE_TEMP_DIFF 50
57	#define CM_DEFAULT_CHARGE_TEMP_MAX 500
58
59	/*
60	* Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
61	* delayed works so that we can run delayed works with CM_JIFFIES_SMALL
62	* without any delays.
63	*/
64	#define CM_JIFFIES_SMALL (2)
65
66	/* If y is valid (> 0) and smaller than x, do x = y */
67	#define CM_MIN_VALID(x, y) x = (((y > 0) && ((x) > (y))) ? (y) : (x))
68
69	/*
70	* Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
71	* rtc alarm. It should be 2 or larger
72	*/
73	#define CM_RTC_SMALL (2)
74
75	static LIST_HEAD(cm_list);
76	static DEFINE_MUTEX(cm_list_mtx);
77
78	/* About in-suspend (suspend-again) monitoring */
79	static struct alarm *cm_timer;
80
81	static bool cm_suspended;
82	static bool cm_timer_set;
83	static unsigned long cm_suspend_duration_ms;
84
85	/* About normal (not suspended) monitoring */
86	static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
87	static unsigned long next_polling; /* Next appointed polling time */
88	static struct workqueue_struct *cm_wq; /* init at driver add */
89	static struct delayed_work cm_monitor_work; /* init at driver add */
90
91	/**
92	* is_batt_present - See if the battery presents in place.
93	* @cm: the Charger Manager representing the battery.
94	*/
95	static bool is_batt_present(struct charger_manager *cm)
96	{
97	union power_supply_propval val;
98	struct power_supply *psy;
99	bool present = false;
100	int i, ret;
101
102	switch (cm->desc->battery_present) {
103	case CM_BATTERY_PRESENT:
104	present = true;
105	break;
106	case CM_NO_BATTERY:
107	break;
108	case CM_FUEL_GAUGE:
109	psy = power_supply_get_by_name(name: cm->desc->psy_fuel_gauge);
110	if (!psy)
111	break;
112
113	ret = power_supply_get_property(psy, psp: POWER_SUPPLY_PROP_PRESENT,
114	val: &val);
115	if (ret == 0 && val.intval)
116	present = true;
117	power_supply_put(psy);
118	break;
119	case CM_CHARGER_STAT:
120	for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
121	psy = power_supply_get_by_name(
122	name: cm->desc->psy_charger_stat[i]);
123	if (!psy) {
124	dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
125	cm->desc->psy_charger_stat[i]);
126	continue;
127	}
128
129	ret = power_supply_get_property(psy,
130	psp: POWER_SUPPLY_PROP_PRESENT, val: &val);
131	power_supply_put(psy);
132	if (ret == 0 && val.intval) {
133	present = true;
134	break;
135	}
136	}
137	break;
138	}
139
140	return present;
141	}
142
143	/**
144	* is_ext_pwr_online - See if an external power source is attached to charge
145	* @cm: the Charger Manager representing the battery.
146	*
147	* Returns true if at least one of the chargers of the battery has an external
148	* power source attached to charge the battery regardless of whether it is
149	* actually charging or not.
150	*/
151	static bool is_ext_pwr_online(struct charger_manager *cm)
152	{
153	union power_supply_propval val;
154	struct power_supply *psy;
155	bool online = false;
156	int i, ret;
157
158	/* If at least one of them has one, it's yes. */
159	for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
160	psy = power_supply_get_by_name(name: cm->desc->psy_charger_stat[i]);
161	if (!psy) {
162	dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
163	cm->desc->psy_charger_stat[i]);
164	continue;
165	}
166
167	ret = power_supply_get_property(psy, psp: POWER_SUPPLY_PROP_ONLINE,
168	val: &val);
169	power_supply_put(psy);
170	if (ret == 0 && val.intval) {
171	online = true;
172	break;
173	}
174	}
175
176	return online;
177	}
178
179	/**
180	* get_batt_uV - Get the voltage level of the battery
181	* @cm: the Charger Manager representing the battery.
182	* @uV: the voltage level returned.
183	*
184	* Returns 0 if there is no error.
185	* Returns a negative value on error.
186	*/
187	static int get_batt_uV(struct charger_manager *cm, int *uV)
188	{
189	union power_supply_propval val;
190	struct power_supply *fuel_gauge;
191	int ret;
192
193	fuel_gauge = power_supply_get_by_name(name: cm->desc->psy_fuel_gauge);
194	if (!fuel_gauge)
195	return -ENODEV;
196
197	ret = power_supply_get_property(psy: fuel_gauge,
198	psp: POWER_SUPPLY_PROP_VOLTAGE_NOW, val: &val);
199	power_supply_put(psy: fuel_gauge);
200	if (ret)
201	return ret;
202
203	*uV = val.intval;
204	return 0;
205	}
206
207	/**
208	* is_charging - Returns true if the battery is being charged.
209	* @cm: the Charger Manager representing the battery.
210	*/
211	static bool is_charging(struct charger_manager *cm)
212	{
213	int i, ret;
214	bool charging = false;
215	struct power_supply *psy;
216	union power_supply_propval val;
217
218	/* If there is no battery, it cannot be charged */
219	if (!is_batt_present(cm))
220	return false;
221
222	/* If at least one of the charger is charging, return yes */
223	for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
224	/* 1. The charger sholuld not be DISABLED */
225	if (cm->emergency_stop)
226	continue;
227	if (!cm->charger_enabled)
228	continue;
229
230	psy = power_supply_get_by_name(name: cm->desc->psy_charger_stat[i]);
231	if (!psy) {
232	dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
233	cm->desc->psy_charger_stat[i]);
234	continue;
235	}
236
237	/* 2. The charger should be online (ext-power) */
238	ret = power_supply_get_property(psy, psp: POWER_SUPPLY_PROP_ONLINE,
239	val: &val);
240	if (ret) {
241	dev_warn(cm->dev, "Cannot read ONLINE value from %s\n",
242	cm->desc->psy_charger_stat[i]);
243	power_supply_put(psy);
244	continue;
245	}
246	if (val.intval == 0) {
247	power_supply_put(psy);
248	continue;
249	}
250
251	/*
252	* 3. The charger should not be FULL, DISCHARGING,
253	* or NOT_CHARGING.
254	*/
255	ret = power_supply_get_property(psy, psp: POWER_SUPPLY_PROP_STATUS,
256	val: &val);
257	power_supply_put(psy);
258	if (ret) {
259	dev_warn(cm->dev, "Cannot read STATUS value from %s\n",
260	cm->desc->psy_charger_stat[i]);
261	continue;
262	}
263	if (val.intval == POWER_SUPPLY_STATUS_FULL ||
264	val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
265	val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
266	continue;
267
268	/* Then, this is charging. */
269	charging = true;
270	break;
271	}
272
273	return charging;
274	}
275
276	/**
277	* is_full_charged - Returns true if the battery is fully charged.
278	* @cm: the Charger Manager representing the battery.
279	*/
280	static bool is_full_charged(struct charger_manager *cm)
281	{
282	struct charger_desc *desc = cm->desc;
283	union power_supply_propval val;
284	struct power_supply *fuel_gauge;
285	bool is_full = false;
286	int ret = 0;
287	int uV;
288
289	/* If there is no battery, it cannot be charged */
290	if (!is_batt_present(cm))
291	return false;
292
293	fuel_gauge = power_supply_get_by_name(name: cm->desc->psy_fuel_gauge);
294	if (!fuel_gauge)
295	return false;
296
297	/* Full, if it's over the fullbatt voltage */
298	if (desc->fullbatt_uV > 0) {
299	ret = get_batt_uV(cm, uV: &uV);
300	if (!ret) {
301	/* Battery is already full, checks voltage drop. */
302	if (cm->battery_status == POWER_SUPPLY_STATUS_FULL
303	&& desc->fullbatt_vchkdrop_uV)
304	uV += desc->fullbatt_vchkdrop_uV;
305	if (uV >= desc->fullbatt_uV)
306	return true;
307	}
308	}
309
310	if (desc->fullbatt_full_capacity > 0) {
311	val.intval = 0;
312
313	/* Not full if capacity of fuel gauge isn't full */
314	ret = power_supply_get_property(psy: fuel_gauge,
315	psp: POWER_SUPPLY_PROP_CHARGE_FULL, val: &val);
316	if (!ret && val.intval > desc->fullbatt_full_capacity) {
317	is_full = true;
318	goto out;
319	}
320	}
321
322	/* Full, if the capacity is more than fullbatt_soc */
323	if (desc->fullbatt_soc > 0) {
324	val.intval = 0;
325
326	ret = power_supply_get_property(psy: fuel_gauge,
327	psp: POWER_SUPPLY_PROP_CAPACITY, val: &val);
328	if (!ret && val.intval >= desc->fullbatt_soc) {
329	is_full = true;
330	goto out;
331	}
332	}
333
334	out:
335	power_supply_put(psy: fuel_gauge);
336	return is_full;
337	}
338
339	/**
340	* is_polling_required - Return true if need to continue polling for this CM.
341	* @cm: the Charger Manager representing the battery.
342	*/
343	static bool is_polling_required(struct charger_manager *cm)
344	{
345	switch (cm->desc->polling_mode) {
346	case CM_POLL_DISABLE:
347	return false;
348	case CM_POLL_ALWAYS:
349	return true;
350	case CM_POLL_EXTERNAL_POWER_ONLY:
351	return is_ext_pwr_online(cm);
352	case CM_POLL_CHARGING_ONLY:
353	return is_charging(cm);
354	default:
355	dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
356	cm->desc->polling_mode);
357	}
358
359	return false;
360	}
361
362	/**
363	* try_charger_enable - Enable/Disable chargers altogether
364	* @cm: the Charger Manager representing the battery.
365	* @enable: true: enable / false: disable
366	*
367	* Note that Charger Manager keeps the charger enabled regardless whether
368	* the charger is charging or not (because battery is full or no external
369	* power source exists) except when CM needs to disable chargers forcibly
370	* because of emergency causes; when the battery is overheated or too cold.
371	*/
372	static int try_charger_enable(struct charger_manager *cm, bool enable)
373	{
374	int err = 0, i;
375	struct charger_desc *desc = cm->desc;
376
377	/* Ignore if it's redundant command */
378	if (enable == cm->charger_enabled)
379	return 0;
380
381	if (enable) {
382	if (cm->emergency_stop)
383	return -EAGAIN;
384
385	/*
386	* Save start time of charging to limit
387	* maximum possible charging time.
388	*/
389	cm->charging_start_time = ktime_to_ms(kt: ktime_get());
390	cm->charging_end_time = 0;
391
392	for (i = 0 ; i < desc->num_charger_regulators ; i++) {
393	if (desc->charger_regulators[i].externally_control)
394	continue;
395
396	err = regulator_enable(regulator: desc->charger_regulators[i].consumer);
397	if (err < 0) {
398	dev_warn(cm->dev, "Cannot enable %s regulator\n",
399	desc->charger_regulators[i].regulator_name);
400	}
401	}
402	} else {
403	/*
404	* Save end time of charging to maintain fully charged state
405	* of battery after full-batt.
406	*/
407	cm->charging_start_time = 0;
408	cm->charging_end_time = ktime_to_ms(kt: ktime_get());
409
410	for (i = 0 ; i < desc->num_charger_regulators ; i++) {
411	if (desc->charger_regulators[i].externally_control)
412	continue;
413
414	err = regulator_disable(regulator: desc->charger_regulators[i].consumer);
415	if (err < 0) {
416	dev_warn(cm->dev, "Cannot disable %s regulator\n",
417	desc->charger_regulators[i].regulator_name);
418	}
419	}
420
421	/*
422	* Abnormal battery state - Stop charging forcibly,
423	* even if charger was enabled at the other places
424	*/
425	for (i = 0; i < desc->num_charger_regulators; i++) {
426	if (regulator_is_enabled(
427	regulator: desc->charger_regulators[i].consumer)) {
428	regulator_force_disable(
429	regulator: desc->charger_regulators[i].consumer);
430	dev_warn(cm->dev, "Disable regulator(%s) forcibly\n",
431	desc->charger_regulators[i].regulator_name);
432	}
433	}
434	}
435
436	if (!err)
437	cm->charger_enabled = enable;
438
439	return err;
440	}
441
442	/**
443	* check_charging_duration - Monitor charging/discharging duration
444	* @cm: the Charger Manager representing the battery.
445	*
446	* If whole charging duration exceed 'charging_max_duration_ms',
447	* cm stop charging to prevent overcharge/overheat. If discharging
448	* duration exceed 'discharging _max_duration_ms', charger cable is
449	* attached, after full-batt, cm start charging to maintain fully
450	* charged state for battery.
451	*/
452	static int check_charging_duration(struct charger_manager *cm)
453	{
454	struct charger_desc *desc = cm->desc;
455	u64 curr = ktime_to_ms(kt: ktime_get());
456	u64 duration;
457	int ret = false;
458
459	if (!desc->charging_max_duration_ms &&
460	!desc->discharging_max_duration_ms)
461	return ret;
462
463	if (cm->charger_enabled) {
464	duration = curr - cm->charging_start_time;
465
466	if (duration > desc->charging_max_duration_ms) {
467	dev_info(cm->dev, "Charging duration exceed %ums\n",
468	desc->charging_max_duration_ms);
469	ret = true;
470	}
471	} else if (cm->battery_status == POWER_SUPPLY_STATUS_NOT_CHARGING) {
472	duration = curr - cm->charging_end_time;
473
474	if (duration > desc->discharging_max_duration_ms) {
475	dev_info(cm->dev, "Discharging duration exceed %ums\n",
476	desc->discharging_max_duration_ms);
477	ret = true;
478	}
479	}
480
481	return ret;
482	}
483
484	static int cm_get_battery_temperature_by_psy(struct charger_manager *cm,
485	int *temp)
486	{
487	struct power_supply *fuel_gauge;
488	int ret;
489
490	fuel_gauge = power_supply_get_by_name(name: cm->desc->psy_fuel_gauge);
491	if (!fuel_gauge)
492	return -ENODEV;
493
494	ret = power_supply_get_property(psy: fuel_gauge,
495	psp: POWER_SUPPLY_PROP_TEMP,
496	val: (union power_supply_propval *)temp);
497	power_supply_put(psy: fuel_gauge);
498
499	return ret;
500	}
501
502	static int cm_get_battery_temperature(struct charger_manager *cm,
503	int *temp)
504	{
505	int ret;
506
507	if (!cm->desc->measure_battery_temp)
508	return -ENODEV;
509
510	#ifdef CONFIG_THERMAL
511	if (cm->tzd_batt) {
512	ret = thermal_zone_get_temp(tz: cm->tzd_batt, temp);
513	if (!ret)
514	/* Calibrate temperature unit */
515	*temp /= 100;
516	} else
517	#endif
518	{
519	/* if-else continued from CONFIG_THERMAL */
520	ret = cm_get_battery_temperature_by_psy(cm, temp);
521	}
522
523	return ret;
524	}
525
526	static int cm_check_thermal_status(struct charger_manager *cm)
527	{
528	struct charger_desc *desc = cm->desc;
529	int temp, upper_limit, lower_limit;
530	int ret = 0;
531
532	ret = cm_get_battery_temperature(cm, temp: &temp);
533	if (ret) {
534	/* FIXME:
535	* No information of battery temperature might
536	* occur hazardous result. We have to handle it
537	* depending on battery type.
538	*/
539	dev_err(cm->dev, "Failed to get battery temperature\n");
540	return 0;
541	}
542
543	upper_limit = desc->temp_max;
544	lower_limit = desc->temp_min;
545
546	if (cm->emergency_stop) {
547	upper_limit -= desc->temp_diff;
548	lower_limit += desc->temp_diff;
549	}
550
551	if (temp > upper_limit)
552	ret = CM_BATT_OVERHEAT;
553	else if (temp < lower_limit)
554	ret = CM_BATT_COLD;
555	else
556	ret = CM_BATT_OK;
557
558	cm->emergency_stop = ret;
559
560	return ret;
561	}
562
563	/**
564	* cm_get_target_status - Check current status and get next target status.
565	* @cm: the Charger Manager representing the battery.
566	*/
567	static int cm_get_target_status(struct charger_manager *cm)
568	{
569	if (!is_ext_pwr_online(cm))
570	return POWER_SUPPLY_STATUS_DISCHARGING;
571
572	if (cm_check_thermal_status(cm)) {
573	/* Check if discharging duration exceeds limit. */
574	if (check_charging_duration(cm))
575	goto charging_ok;
576	return POWER_SUPPLY_STATUS_NOT_CHARGING;
577	}
578
579	switch (cm->battery_status) {
580	case POWER_SUPPLY_STATUS_CHARGING:
581	/* Check if charging duration exceeds limit. */
582	if (check_charging_duration(cm))
583	return POWER_SUPPLY_STATUS_FULL;
584	fallthrough;
585	case POWER_SUPPLY_STATUS_FULL:
586	if (is_full_charged(cm))
587	return POWER_SUPPLY_STATUS_FULL;
588	fallthrough;
589	default:
590	break;
591	}
592
593	charging_ok:
594	/* Charging is allowed. */
595	return POWER_SUPPLY_STATUS_CHARGING;
596	}
597
598	/**
599	* _cm_monitor - Monitor the temperature and return true for exceptions.
600	* @cm: the Charger Manager representing the battery.
601	*
602	* Returns true if there is an event to notify for the battery.
603	* (True if the status of "emergency_stop" changes)
604	*/
605	static bool _cm_monitor(struct charger_manager *cm)
606	{
607	int target;
608
609	target = cm_get_target_status(cm);
610
611	try_charger_enable(cm, enable: (target == POWER_SUPPLY_STATUS_CHARGING));
612
613	if (cm->battery_status != target) {
614	cm->battery_status = target;
615	power_supply_changed(psy: cm->charger_psy);
616	}
617
618	return (cm->battery_status == POWER_SUPPLY_STATUS_NOT_CHARGING);
619	}
620
621	/**
622	* cm_monitor - Monitor every battery.
623	*
624	* Returns true if there is an event to notify from any of the batteries.
625	* (True if the status of "emergency_stop" changes)
626	*/
627	static bool cm_monitor(void)
628	{
629	bool stop = false;
630	struct charger_manager *cm;
631
632	mutex_lock(&cm_list_mtx);
633
634	list_for_each_entry(cm, &cm_list, entry) {
635	if (_cm_monitor(cm))
636	stop = true;
637	}
638
639	mutex_unlock(lock: &cm_list_mtx);
640
641	return stop;
642	}
643
644	/**
645	* _setup_polling - Setup the next instance of polling.
646	* @work: work_struct of the function _setup_polling.
647	*/
648	static void _setup_polling(struct work_struct *work)
649	{
650	unsigned long min = ULONG_MAX;
651	struct charger_manager *cm;
652	bool keep_polling = false;
653	unsigned long _next_polling;
654
655	mutex_lock(&cm_list_mtx);
656
657	list_for_each_entry(cm, &cm_list, entry) {
658	if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
659	keep_polling = true;
660
661	if (min > cm->desc->polling_interval_ms)
662	min = cm->desc->polling_interval_ms;
663	}
664	}
665
666	polling_jiffy = msecs_to_jiffies(m: min);
667	if (polling_jiffy <= CM_JIFFIES_SMALL)
668	polling_jiffy = CM_JIFFIES_SMALL + 1;
669
670	if (!keep_polling)
671	polling_jiffy = ULONG_MAX;
672	if (polling_jiffy == ULONG_MAX)
673	goto out;
674
675	WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
676	". try it later. %s\n", __func__);
677
678	/*
679	* Use mod_delayed_work() iff the next polling interval should
680	* occur before the currently scheduled one. If @cm_monitor_work
681	* isn't active, the end result is the same, so no need to worry
682	* about stale @next_polling.
683	*/
684	_next_polling = jiffies + polling_jiffy;
685
686	if (time_before(_next_polling, next_polling)) {
687	mod_delayed_work(wq: cm_wq, dwork: &cm_monitor_work, delay: polling_jiffy);
688	next_polling = _next_polling;
689	} else {
690	if (queue_delayed_work(wq: cm_wq, dwork: &cm_monitor_work, delay: polling_jiffy))
691	next_polling = _next_polling;
692	}
693	out:
694	mutex_unlock(lock: &cm_list_mtx);
695	}
696	static DECLARE_WORK(setup_polling, _setup_polling);
697
698	/**
699	* cm_monitor_poller - The Monitor / Poller.
700	* @work: work_struct of the function cm_monitor_poller
701	*
702	* During non-suspended state, cm_monitor_poller is used to poll and monitor
703	* the batteries.
704	*/
705	static void cm_monitor_poller(struct work_struct *work)
706	{
707	cm_monitor();
708	schedule_work(work: &setup_polling);
709	}
710
711	static int charger_get_property(struct power_supply *psy,
712	enum power_supply_property psp,
713	union power_supply_propval *val)
714	{
715	struct charger_manager *cm = power_supply_get_drvdata(psy);
716	struct charger_desc *desc = cm->desc;
717	struct power_supply *fuel_gauge = NULL;
718	int ret = 0;
719	int uV;
720
721	switch (psp) {
722	case POWER_SUPPLY_PROP_STATUS:
723	val->intval = cm->battery_status;
724	break;
725	case POWER_SUPPLY_PROP_HEALTH:
726	if (cm->emergency_stop == CM_BATT_OVERHEAT)
727	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
728	else if (cm->emergency_stop == CM_BATT_COLD)
729	val->intval = POWER_SUPPLY_HEALTH_COLD;
730	else
731	val->intval = POWER_SUPPLY_HEALTH_GOOD;
732	break;
733	case POWER_SUPPLY_PROP_PRESENT:
734	if (is_batt_present(cm))
735	val->intval = 1;
736	else
737	val->intval = 0;
738	break;
739	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
740	ret = get_batt_uV(cm, uV: &val->intval);
741	break;
742	case POWER_SUPPLY_PROP_CURRENT_NOW:
743	fuel_gauge = power_supply_get_by_name(name: cm->desc->psy_fuel_gauge);
744	if (!fuel_gauge) {
745	ret = -ENODEV;
746	break;
747	}
748	ret = power_supply_get_property(psy: fuel_gauge,
749	psp: POWER_SUPPLY_PROP_CURRENT_NOW, val);
750	break;
751	case POWER_SUPPLY_PROP_TEMP:
752	return cm_get_battery_temperature(cm, temp: &val->intval);
753	case POWER_SUPPLY_PROP_CAPACITY:
754	if (!is_batt_present(cm)) {
755	/* There is no battery. Assume 100% */
756	val->intval = 100;
757	break;
758	}
759
760	fuel_gauge = power_supply_get_by_name(name: cm->desc->psy_fuel_gauge);
761	if (!fuel_gauge) {
762	ret = -ENODEV;
763	break;
764	}
765
766	ret = power_supply_get_property(psy: fuel_gauge,
767	psp: POWER_SUPPLY_PROP_CAPACITY, val);
768	if (ret)
769	break;
770
771	if (val->intval > 100) {
772	val->intval = 100;
773	break;
774	}
775	if (val->intval < 0)
776	val->intval = 0;
777
778	/* Do not adjust SOC when charging: voltage is overrated */
779	if (is_charging(cm))
780	break;
781
782	/*
783	* If the capacity value is inconsistent, calibrate it base on
784	* the battery voltage values and the thresholds given as desc
785	*/
786	ret = get_batt_uV(cm, uV: &uV);
787	if (ret) {
788	/* Voltage information not available. No calibration */
789	ret = 0;
790	break;
791	}
792
793	if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
794	!is_charging(cm)) {
795	val->intval = 100;
796	break;
797	}
798
799	break;
800	case POWER_SUPPLY_PROP_ONLINE:
801	if (is_ext_pwr_online(cm))
802	val->intval = 1;
803	else
804	val->intval = 0;
805	break;
806	case POWER_SUPPLY_PROP_CHARGE_FULL:
807	case POWER_SUPPLY_PROP_CHARGE_NOW:
808	fuel_gauge = power_supply_get_by_name(name: cm->desc->psy_fuel_gauge);
809	if (!fuel_gauge) {
810	ret = -ENODEV;
811	break;
812	}
813	ret = power_supply_get_property(psy: fuel_gauge, psp, val);
814	break;
815	default:
816	return -EINVAL;
817	}
818	if (fuel_gauge)
819	power_supply_put(psy: fuel_gauge);
820	return ret;
821	}
822
823	#define NUM_CHARGER_PSY_OPTIONAL (4)
824	static enum power_supply_property default_charger_props[] = {
825	/* Guaranteed to provide */
826	POWER_SUPPLY_PROP_STATUS,
827	POWER_SUPPLY_PROP_HEALTH,
828	POWER_SUPPLY_PROP_PRESENT,
829	POWER_SUPPLY_PROP_VOLTAGE_NOW,
830	POWER_SUPPLY_PROP_CAPACITY,
831	POWER_SUPPLY_PROP_ONLINE,
832	/*
833	* Optional properties are:
834	* POWER_SUPPLY_PROP_CHARGE_FULL,
835	* POWER_SUPPLY_PROP_CHARGE_NOW,
836	* POWER_SUPPLY_PROP_CURRENT_NOW,
837	* POWER_SUPPLY_PROP_TEMP,
838	*/
839	};
840
841	static const struct power_supply_desc psy_default = {
842	.name = "battery",
843	.type = POWER_SUPPLY_TYPE_BATTERY,
844	.properties = default_charger_props,
845	.num_properties = ARRAY_SIZE(default_charger_props),
846	.get_property = charger_get_property,
847	.no_thermal = true,
848	};
849
850	/**
851	* cm_setup_timer - For in-suspend monitoring setup wakeup alarm
852	* for suspend_again.
853	*
854	* Returns true if the alarm is set for Charger Manager to use.
855	* Returns false if
856	* cm_setup_timer fails to set an alarm,
857	* cm_setup_timer does not need to set an alarm for Charger Manager,
858	* or an alarm previously configured is to be used.
859	*/
860	static bool cm_setup_timer(void)
861	{
862	struct charger_manager *cm;
863	unsigned int wakeup_ms = UINT_MAX;
864	int timer_req = 0;
865
866	if (time_after(next_polling, jiffies))
867	CM_MIN_VALID(wakeup_ms,
868	jiffies_to_msecs(next_polling - jiffies));
869
870	mutex_lock(&cm_list_mtx);
871	list_for_each_entry(cm, &cm_list, entry) {
872	/* Skip if polling is not required for this CM */
873	if (!is_polling_required(cm) && !cm->emergency_stop)
874	continue;
875	timer_req++;
876	if (cm->desc->polling_interval_ms == 0)
877	continue;
878	CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
879	}
880	mutex_unlock(lock: &cm_list_mtx);
881
882	if (timer_req && cm_timer) {
883	ktime_t now, add;
884
885	/*
886	* Set alarm with the polling interval (wakeup_ms)
887	* The alarm time should be NOW + CM_RTC_SMALL or later.
888	*/
889	if (wakeup_ms == UINT_MAX ||
890	wakeup_ms < CM_RTC_SMALL * MSEC_PER_SEC)
891	wakeup_ms = 2 * CM_RTC_SMALL * MSEC_PER_SEC;
892
893	pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
894
895	now = ktime_get_boottime();
896	add = ktime_set(secs: wakeup_ms / MSEC_PER_SEC,
897	nsecs: (wakeup_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
898	alarm_start(alarm: cm_timer, ktime_add(now, add));
899
900	cm_suspend_duration_ms = wakeup_ms;
901
902	return true;
903	}
904	return false;
905	}
906
907	/**
908	* charger_extcon_work - enable/diable charger according to the state
909	* of charger cable
910	*
911	* @work: work_struct of the function charger_extcon_work.
912	*/
913	static void charger_extcon_work(struct work_struct *work)
914	{
915	struct charger_cable *cable =
916	container_of(work, struct charger_cable, wq);
917	int ret;
918
919	if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
920	ret = regulator_set_current_limit(regulator: cable->charger->consumer,
921	min_uA: cable->min_uA, max_uA: cable->max_uA);
922	if (ret < 0) {
923	pr_err("Cannot set current limit of %s (%s)\n",
924	cable->charger->regulator_name, cable->name);
925	return;
926	}
927
928	pr_info("Set current limit of %s : %duA ~ %duA\n",
929	cable->charger->regulator_name,
930	cable->min_uA, cable->max_uA);
931	}
932
933	cancel_delayed_work(dwork: &cm_monitor_work);
934	queue_delayed_work(wq: cm_wq, dwork: &cm_monitor_work, delay: 0);
935	}
936
937	/**
938	* charger_extcon_notifier - receive the state of charger cable
939	* when registered cable is attached or detached.
940	*
941	* @self: the notifier block of the charger_extcon_notifier.
942	* @event: the cable state.
943	* @ptr: the data pointer of notifier block.
944	*/
945	static int charger_extcon_notifier(struct notifier_block *self,
946	unsigned long event, void *ptr)
947	{
948	struct charger_cable *cable =
949	container_of(self, struct charger_cable, nb);
950
951	/*
952	* The newly state of charger cable.
953	* If cable is attached, cable->attached is true.
954	*/
955	cable->attached = event;
956
957	/*
958	* Setup work for controlling charger(regulator)
959	* according to charger cable.
960	*/
961	schedule_work(work: &cable->wq);
962
963	return NOTIFY_DONE;
964	}
965
966	/**
967	* charger_extcon_init - register external connector to use it
968	* as the charger cable
969	*
970	* @cm: the Charger Manager representing the battery.
971	* @cable: the Charger cable representing the external connector.
972	*/
973	static int charger_extcon_init(struct charger_manager *cm,
974	struct charger_cable *cable)
975	{
976	int ret, i;
977	u64 extcon_type = EXTCON_NONE;
978
979	/*
980	* Charger manager use Extcon framework to identify
981	* the charger cable among various external connector
982	* cable (e.g., TA, USB, MHL, Dock).
983	*/
984	INIT_WORK(&cable->wq, charger_extcon_work);
985	cable->nb.notifier_call = charger_extcon_notifier;
986
987	cable->extcon_dev = extcon_get_extcon_dev(extcon_name: cable->extcon_name);
988	if (IS_ERR(ptr: cable->extcon_dev)) {
989	pr_err("Cannot find extcon_dev for %s (cable: %s)\n",
990	cable->extcon_name, cable->name);
991	return PTR_ERR(ptr: cable->extcon_dev);
992	}
993
994	for (i = 0; i < ARRAY_SIZE(extcon_mapping); i++) {
995	if (!strcmp(cable->name, extcon_mapping[i].name)) {
996	extcon_type = extcon_mapping[i].extcon_type;
997	break;
998	}
999	}
1000	if (extcon_type == EXTCON_NONE) {
1001	pr_err("Cannot find cable for type %s", cable->name);
1002	return -EINVAL;
1003	}
1004
1005	cable->extcon_type = extcon_type;
1006
1007	ret = devm_extcon_register_notifier(dev: cm->dev, edev: cable->extcon_dev,
1008	id: cable->extcon_type, nb: &cable->nb);
1009	if (ret < 0) {
1010	pr_err("Cannot register extcon_dev for %s (cable: %s)\n",
1011	cable->extcon_name, cable->name);
1012	return ret;
1013	}
1014
1015	return 0;
1016	}
1017
1018	/**
1019	* charger_manager_register_extcon - Register extcon device to receive state
1020	* of charger cable.
1021	* @cm: the Charger Manager representing the battery.
1022	*
1023	* This function support EXTCON(External Connector) subsystem to detect the
1024	* state of charger cables for enabling or disabling charger(regulator) and
1025	* select the charger cable for charging among a number of external cable
1026	* according to policy of H/W board.
1027	*/
1028	static int charger_manager_register_extcon(struct charger_manager *cm)
1029	{
1030	struct charger_desc *desc = cm->desc;
1031	struct charger_regulator *charger;
1032	unsigned long event;
1033	int ret;
1034	int i;
1035	int j;
1036
1037	for (i = 0; i < desc->num_charger_regulators; i++) {
1038	charger = &desc->charger_regulators[i];
1039
1040	charger->consumer = regulator_get(dev: cm->dev,
1041	id: charger->regulator_name);
1042	if (IS_ERR(ptr: charger->consumer)) {
1043	dev_err(cm->dev, "Cannot find charger(%s)\n",
1044	charger->regulator_name);
1045	return PTR_ERR(ptr: charger->consumer);
1046	}
1047	charger->cm = cm;
1048
1049	for (j = 0; j < charger->num_cables; j++) {
1050	struct charger_cable *cable = &charger->cables[j];
1051
1052	ret = charger_extcon_init(cm, cable);
1053	if (ret < 0) {
1054	dev_err(cm->dev, "Cannot initialize charger(%s)\n",
1055	charger->regulator_name);
1056	return ret;
1057	}
1058	cable->charger = charger;
1059	cable->cm = cm;
1060
1061	event = extcon_get_state(edev: cable->extcon_dev,
1062	id: cable->extcon_type);
1063	charger_extcon_notifier(self: &cable->nb,
1064	event, NULL);
1065	}
1066	}
1067
1068	return 0;
1069	}
1070
1071	/* help function of sysfs node to control charger(regulator) */
1072	static ssize_t charger_name_show(struct device *dev,
1073	struct device_attribute *attr, char *buf)
1074	{
1075	struct charger_regulator *charger
1076	= container_of(attr, struct charger_regulator, attr_name);
1077
1078	return sysfs_emit(buf, fmt: "%s\n", charger->regulator_name);
1079	}
1080
1081	static ssize_t charger_state_show(struct device *dev,
1082	struct device_attribute *attr, char *buf)
1083	{
1084	struct charger_regulator *charger
1085	= container_of(attr, struct charger_regulator, attr_state);
1086	int state = 0;
1087
1088	if (!charger->externally_control)
1089	state = regulator_is_enabled(regulator: charger->consumer);
1090
1091	return sysfs_emit(buf, fmt: "%s\n", state ? "enabled" : "disabled");
1092	}
1093
1094	static ssize_t charger_externally_control_show(struct device *dev,
1095	struct device_attribute *attr, char *buf)
1096	{
1097	struct charger_regulator *charger = container_of(attr,
1098	struct charger_regulator, attr_externally_control);
1099
1100	return sysfs_emit(buf, fmt: "%d\n", charger->externally_control);
1101	}
1102
1103	static ssize_t charger_externally_control_store(struct device *dev,
1104	struct device_attribute *attr, const char *buf,
1105	size_t count)
1106	{
1107	struct charger_regulator *charger
1108	= container_of(attr, struct charger_regulator,
1109	attr_externally_control);
1110	struct charger_manager *cm = charger->cm;
1111	struct charger_desc *desc = cm->desc;
1112	int i;
1113	int ret;
1114	int externally_control;
1115	int chargers_externally_control = 1;
1116
1117	ret = sscanf(buf, "%d", &externally_control);
1118	if (ret == 0) {
1119	ret = -EINVAL;
1120	return ret;
1121	}
1122
1123	if (!externally_control) {
1124	charger->externally_control = 0;
1125	return count;
1126	}
1127
1128	for (i = 0; i < desc->num_charger_regulators; i++) {
1129	if (&desc->charger_regulators[i] != charger &&
1130	!desc->charger_regulators[i].externally_control) {
1131	/*
1132	* At least, one charger is controlled by
1133	* charger-manager
1134	*/
1135	chargers_externally_control = 0;
1136	break;
1137	}
1138	}
1139
1140	if (!chargers_externally_control) {
1141	if (cm->charger_enabled) {
1142	try_charger_enable(cm: charger->cm, enable: false);
1143	charger->externally_control = externally_control;
1144	try_charger_enable(cm: charger->cm, enable: true);
1145	} else {
1146	charger->externally_control = externally_control;
1147	}
1148	} else {
1149	dev_warn(cm->dev,
1150	"'%s' regulator should be controlled in charger-manager because charger-manager must need at least one charger for charging\n",
1151	charger->regulator_name);
1152	}
1153
1154	return count;
1155	}
1156
1157	/**
1158	* charger_manager_prepare_sysfs - Prepare sysfs entry for each charger
1159	* @cm: the Charger Manager representing the battery.
1160	*
1161	* This function add sysfs entry for charger(regulator) to control charger from
1162	* user-space. If some development board use one more chargers for charging
1163	* but only need one charger on specific case which is dependent on user
1164	* scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
1165	* class/power_supply/battery/charger.[index]/externally_control'. For example,
1166	* if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
1167	* externally_control, this charger isn't controlled from charger-manager and
1168	* always stay off state of regulator.
1169	*/
1170	static int charger_manager_prepare_sysfs(struct charger_manager *cm)
1171	{
1172	struct charger_desc *desc = cm->desc;
1173	struct charger_regulator *charger;
1174	int chargers_externally_control = 1;
1175	char *name;
1176	int i;
1177
1178	/* Create sysfs entry to control charger(regulator) */
1179	for (i = 0; i < desc->num_charger_regulators; i++) {
1180	charger = &desc->charger_regulators[i];
1181
1182	name = devm_kasprintf(dev: cm->dev, GFP_KERNEL, fmt: "charger.%d", i);
1183	if (!name)
1184	return -ENOMEM;
1185
1186	charger->attrs[0] = &charger->attr_name.attr;
1187	charger->attrs[1] = &charger->attr_state.attr;
1188	charger->attrs[2] = &charger->attr_externally_control.attr;
1189	charger->attrs[3] = NULL;
1190
1191	charger->attr_grp.name = name;
1192	charger->attr_grp.attrs = charger->attrs;
1193	desc->sysfs_groups[i] = &charger->attr_grp;
1194
1195	sysfs_attr_init(&charger->attr_name.attr);
1196	charger->attr_name.attr.name = "name";
1197	charger->attr_name.attr.mode = 0444;
1198	charger->attr_name.show = charger_name_show;
1199
1200	sysfs_attr_init(&charger->attr_state.attr);
1201	charger->attr_state.attr.name = "state";
1202	charger->attr_state.attr.mode = 0444;
1203	charger->attr_state.show = charger_state_show;
1204
1205	sysfs_attr_init(&charger->attr_externally_control.attr);
1206	charger->attr_externally_control.attr.name
1207	= "externally_control";
1208	charger->attr_externally_control.attr.mode = 0644;
1209	charger->attr_externally_control.show
1210	= charger_externally_control_show;
1211	charger->attr_externally_control.store
1212	= charger_externally_control_store;
1213
1214	if (!desc->charger_regulators[i].externally_control ||
1215	!chargers_externally_control)
1216	chargers_externally_control = 0;
1217
1218	dev_info(cm->dev, "'%s' regulator's externally_control is %d\n",
1219	charger->regulator_name, charger->externally_control);
1220	}
1221
1222	if (chargers_externally_control) {
1223	dev_err(cm->dev, "Cannot register regulator because charger-manager must need at least one charger for charging battery\n");
1224	return -EINVAL;
1225	}
1226
1227	return 0;
1228	}
1229
1230	static int cm_init_thermal_data(struct charger_manager *cm,
1231	struct power_supply *fuel_gauge,
1232	enum power_supply_property *properties,
1233	size_t *num_properties)
1234	{
1235	struct charger_desc *desc = cm->desc;
1236	union power_supply_propval val;
1237	int ret;
1238
1239	/* Verify whether fuel gauge provides battery temperature */
1240	ret = power_supply_get_property(psy: fuel_gauge,
1241	psp: POWER_SUPPLY_PROP_TEMP, val: &val);
1242
1243	if (!ret) {
1244	properties[*num_properties] = POWER_SUPPLY_PROP_TEMP;
1245	(*num_properties)++;
1246	cm->desc->measure_battery_temp = true;
1247	}
1248	#ifdef CONFIG_THERMAL
1249	if (ret && desc->thermal_zone) {
1250	cm->tzd_batt =
1251	thermal_zone_get_zone_by_name(name: desc->thermal_zone);
1252	if (IS_ERR(ptr: cm->tzd_batt))
1253	return PTR_ERR(ptr: cm->tzd_batt);
1254
1255	/* Use external thermometer */
1256	properties[*num_properties] = POWER_SUPPLY_PROP_TEMP;
1257	(*num_properties)++;
1258	cm->desc->measure_battery_temp = true;
1259	ret = 0;
1260	}
1261	#endif
1262	if (cm->desc->measure_battery_temp) {
1263	/* NOTICE : Default allowable minimum charge temperature is 0 */
1264	if (!desc->temp_max)
1265	desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX;
1266	if (!desc->temp_diff)
1267	desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF;
1268	}
1269
1270	return ret;
1271	}
1272
1273	static const struct of_device_id charger_manager_match[] = {
1274	{
1275	.compatible = "charger-manager",
1276	},
1277	{},
1278	};
1279	MODULE_DEVICE_TABLE(of, charger_manager_match);
1280
1281	static struct charger_desc *of_cm_parse_desc(struct device *dev)
1282	{
1283	struct charger_desc *desc;
1284	struct device_node *np = dev->of_node;
1285	u32 poll_mode = CM_POLL_DISABLE;
1286	u32 battery_stat = CM_NO_BATTERY;
1287	int num_chgs = 0;
1288
1289	desc = devm_kzalloc(dev, size: sizeof(*desc), GFP_KERNEL);
1290	if (!desc)
1291	return ERR_PTR(error: -ENOMEM);
1292
1293	of_property_read_string(np, propname: "cm-name", out_string: &desc->psy_name);
1294
1295	of_property_read_u32(np, propname: "cm-poll-mode", out_value: &poll_mode);
1296	desc->polling_mode = poll_mode;
1297
1298	of_property_read_u32(np, propname: "cm-poll-interval",
1299	out_value: &desc->polling_interval_ms);
1300
1301	of_property_read_u32(np, propname: "cm-fullbatt-vchkdrop-volt",
1302	out_value: &desc->fullbatt_vchkdrop_uV);
1303	of_property_read_u32(np, propname: "cm-fullbatt-voltage", out_value: &desc->fullbatt_uV);
1304	of_property_read_u32(np, propname: "cm-fullbatt-soc", out_value: &desc->fullbatt_soc);
1305	of_property_read_u32(np, propname: "cm-fullbatt-capacity",
1306	out_value: &desc->fullbatt_full_capacity);
1307
1308	of_property_read_u32(np, propname: "cm-battery-stat", out_value: &battery_stat);
1309	desc->battery_present = battery_stat;
1310
1311	/* chargers */
1312	num_chgs = of_property_count_strings(np, propname: "cm-chargers");
1313	if (num_chgs > 0) {
1314	int i;
1315
1316	/* Allocate empty bin at the tail of array */
1317	desc->psy_charger_stat = devm_kcalloc(dev,
1318	n: num_chgs + 1,
1319	size: sizeof(char *),
1320	GFP_KERNEL);
1321	if (!desc->psy_charger_stat)
1322	return ERR_PTR(error: -ENOMEM);
1323
1324	for (i = 0; i < num_chgs; i++)
1325	of_property_read_string_index(np, propname: "cm-chargers",
1326	index: i, output: &desc->psy_charger_stat[i]);
1327	}
1328
1329	of_property_read_string(np, propname: "cm-fuel-gauge", out_string: &desc->psy_fuel_gauge);
1330
1331	of_property_read_string(np, propname: "cm-thermal-zone", out_string: &desc->thermal_zone);
1332
1333	of_property_read_u32(np, propname: "cm-battery-cold", out_value: &desc->temp_min);
1334	if (of_property_read_bool(np, propname: "cm-battery-cold-in-minus"))
1335	desc->temp_min *= -1;
1336	of_property_read_u32(np, propname: "cm-battery-hot", out_value: &desc->temp_max);
1337	of_property_read_u32(np, propname: "cm-battery-temp-diff", out_value: &desc->temp_diff);
1338
1339	of_property_read_u32(np, propname: "cm-charging-max",
1340	out_value: &desc->charging_max_duration_ms);
1341	of_property_read_u32(np, propname: "cm-discharging-max",
1342	out_value: &desc->discharging_max_duration_ms);
1343
1344	/* battery charger regulators */
1345	desc->num_charger_regulators = of_get_child_count(np);
1346	if (desc->num_charger_regulators) {
1347	struct charger_regulator *chg_regs;
1348	struct device_node *child;
1349
1350	chg_regs = devm_kcalloc(dev,
1351	n: desc->num_charger_regulators,
1352	size: sizeof(*chg_regs),
1353	GFP_KERNEL);
1354	if (!chg_regs)
1355	return ERR_PTR(error: -ENOMEM);
1356
1357	desc->charger_regulators = chg_regs;
1358
1359	desc->sysfs_groups = devm_kcalloc(dev,
1360	n: desc->num_charger_regulators + 1,
1361	size: sizeof(*desc->sysfs_groups),
1362	GFP_KERNEL);
1363	if (!desc->sysfs_groups)
1364	return ERR_PTR(error: -ENOMEM);
1365
1366	for_each_child_of_node(np, child) {
1367	struct charger_cable *cables;
1368	struct device_node *_child;
1369
1370	of_property_read_string(np: child, propname: "cm-regulator-name",
1371	out_string: &chg_regs->regulator_name);
1372
1373	/* charger cables */
1374	chg_regs->num_cables = of_get_child_count(np: child);
1375	if (chg_regs->num_cables) {
1376	cables = devm_kcalloc(dev,
1377	n: chg_regs->num_cables,
1378	size: sizeof(*cables),
1379	GFP_KERNEL);
1380	if (!cables) {
1381	of_node_put(node: child);
1382	return ERR_PTR(error: -ENOMEM);
1383	}
1384
1385	chg_regs->cables = cables;
1386
1387	for_each_child_of_node(child, _child) {
1388	of_property_read_string(np: _child,
1389	propname: "cm-cable-name", out_string: &cables->name);
1390	of_property_read_string(np: _child,
1391	propname: "cm-cable-extcon",
1392	out_string: &cables->extcon_name);
1393	of_property_read_u32(np: _child,
1394	propname: "cm-cable-min",
1395	out_value: &cables->min_uA);
1396	of_property_read_u32(np: _child,
1397	propname: "cm-cable-max",
1398	out_value: &cables->max_uA);
1399	cables++;
1400	}
1401	}
1402	chg_regs++;
1403	}
1404	}
1405	return desc;
1406	}
1407
1408	static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
1409	{
1410	if (pdev->dev.of_node)
1411	return of_cm_parse_desc(dev: &pdev->dev);
1412	return dev_get_platdata(dev: &pdev->dev);
1413	}
1414
1415	static enum alarmtimer_restart cm_timer_func(struct alarm *alarm, ktime_t now)
1416	{
1417	cm_timer_set = false;
1418	return ALARMTIMER_NORESTART;
1419	}
1420
1421	static int charger_manager_probe(struct platform_device *pdev)
1422	{
1423	struct charger_desc *desc = cm_get_drv_data(pdev);
1424	struct charger_manager *cm;
1425	int ret, i = 0;
1426	union power_supply_propval val;
1427	struct power_supply *fuel_gauge;
1428	enum power_supply_property *properties;
1429	size_t num_properties;
1430	struct power_supply_config psy_cfg = {};
1431
1432	if (IS_ERR(ptr: desc)) {
1433	dev_err(&pdev->dev, "No platform data (desc) found\n");
1434	return PTR_ERR(ptr: desc);
1435	}
1436
1437	cm = devm_kzalloc(dev: &pdev->dev, size: sizeof(*cm), GFP_KERNEL);
1438	if (!cm)
1439	return -ENOMEM;
1440
1441	/* Basic Values. Unspecified are Null or 0 */
1442	cm->dev = &pdev->dev;
1443	cm->desc = desc;
1444	psy_cfg.drv_data = cm;
1445
1446	/* Initialize alarm timer */
1447	if (alarmtimer_get_rtcdev()) {
1448	cm_timer = devm_kzalloc(dev: cm->dev, size: sizeof(*cm_timer), GFP_KERNEL);
1449	if (!cm_timer)
1450	return -ENOMEM;
1451	alarm_init(alarm: cm_timer, type: ALARM_BOOTTIME, function: cm_timer_func);
1452	}
1453
1454	/*
1455	* Some of the following do not need to be errors.
1456	* Users may intentionally ignore those features.
1457	*/
1458	if (desc->fullbatt_uV == 0) {
1459	dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
1460	}
1461	if (!desc->fullbatt_vchkdrop_uV) {
1462	dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
1463	desc->fullbatt_vchkdrop_uV = 0;
1464	}
1465	if (desc->fullbatt_soc == 0) {
1466	dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
1467	}
1468	if (desc->fullbatt_full_capacity == 0) {
1469	dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
1470	}
1471
1472	if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1473	dev_err(&pdev->dev, "charger_regulators undefined\n");
1474	return -EINVAL;
1475	}
1476
1477	if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1478	dev_err(&pdev->dev, "No power supply defined\n");
1479	return -EINVAL;
1480	}
1481
1482	if (!desc->psy_fuel_gauge) {
1483	dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
1484	return -EINVAL;
1485	}
1486
1487	/* Check if charger's supplies are present at probe */
1488	for (i = 0; desc->psy_charger_stat[i]; i++) {
1489	struct power_supply *psy;
1490
1491	psy = power_supply_get_by_name(name: desc->psy_charger_stat[i]);
1492	if (!psy) {
1493	dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1494	desc->psy_charger_stat[i]);
1495	return -ENODEV;
1496	}
1497	power_supply_put(psy);
1498	}
1499
1500	if (cm->desc->polling_mode != CM_POLL_DISABLE &&
1501	(desc->polling_interval_ms == 0 ||
1502	msecs_to_jiffies(m: desc->polling_interval_ms) <= CM_JIFFIES_SMALL)) {
1503	dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1504	return -EINVAL;
1505	}
1506
1507	if (!desc->charging_max_duration_ms ||
1508	!desc->discharging_max_duration_ms) {
1509	dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
1510	desc->charging_max_duration_ms = 0;
1511	desc->discharging_max_duration_ms = 0;
1512	}
1513
1514	platform_set_drvdata(pdev, data: cm);
1515
1516	memcpy(&cm->charger_psy_desc, &psy_default, sizeof(psy_default));
1517
1518	if (!desc->psy_name)
1519	strscpy(p: cm->psy_name_buf, q: psy_default.name,
1520	size: sizeof(cm->psy_name_buf));
1521	else
1522	strscpy(p: cm->psy_name_buf, q: desc->psy_name,
1523	size: sizeof(cm->psy_name_buf));
1524	cm->charger_psy_desc.name = cm->psy_name_buf;
1525
1526	/* Allocate for psy properties because they may vary */
1527	properties = devm_kcalloc(dev: &pdev->dev,
1528	ARRAY_SIZE(default_charger_props) +
1529	NUM_CHARGER_PSY_OPTIONAL,
1530	size: sizeof(*properties), GFP_KERNEL);
1531	if (!properties)
1532	return -ENOMEM;
1533
1534	memcpy(properties, default_charger_props,
1535	sizeof(enum power_supply_property) *
1536	ARRAY_SIZE(default_charger_props));
1537	num_properties = ARRAY_SIZE(default_charger_props);
1538
1539	/* Find which optional psy-properties are available */
1540	fuel_gauge = power_supply_get_by_name(name: desc->psy_fuel_gauge);
1541	if (!fuel_gauge) {
1542	dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1543	desc->psy_fuel_gauge);
1544	return -ENODEV;
1545	}
1546	if (!power_supply_get_property(psy: fuel_gauge,
1547	psp: POWER_SUPPLY_PROP_CHARGE_FULL, val: &val)) {
1548	properties[num_properties] =
1549	POWER_SUPPLY_PROP_CHARGE_FULL;
1550	num_properties++;
1551	}
1552	if (!power_supply_get_property(psy: fuel_gauge,
1553	psp: POWER_SUPPLY_PROP_CHARGE_NOW, val: &val)) {
1554	properties[num_properties] =
1555	POWER_SUPPLY_PROP_CHARGE_NOW;
1556	num_properties++;
1557	}
1558	if (!power_supply_get_property(psy: fuel_gauge,
1559	psp: POWER_SUPPLY_PROP_CURRENT_NOW,
1560	val: &val)) {
1561	properties[num_properties] =
1562	POWER_SUPPLY_PROP_CURRENT_NOW;
1563	num_properties++;
1564	}
1565
1566	ret = cm_init_thermal_data(cm, fuel_gauge, properties, num_properties: &num_properties);
1567	if (ret) {
1568	dev_err(&pdev->dev, "Failed to initialize thermal data\n");
1569	cm->desc->measure_battery_temp = false;
1570	}
1571	power_supply_put(psy: fuel_gauge);
1572
1573	cm->charger_psy_desc.properties = properties;
1574	cm->charger_psy_desc.num_properties = num_properties;
1575
1576	/* Register sysfs entry for charger(regulator) */
1577	ret = charger_manager_prepare_sysfs(cm);
1578	if (ret < 0) {
1579	dev_err(&pdev->dev,
1580	"Cannot prepare sysfs entry of regulators\n");
1581	return ret;
1582	}
1583	psy_cfg.attr_grp = desc->sysfs_groups;
1584
1585	cm->charger_psy = power_supply_register(parent: &pdev->dev,
1586	desc: &cm->charger_psy_desc,
1587	cfg: &psy_cfg);
1588	if (IS_ERR(ptr: cm->charger_psy)) {
1589	dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
1590	cm->charger_psy_desc.name);
1591	return PTR_ERR(ptr: cm->charger_psy);
1592	}
1593
1594	/* Register extcon device for charger cable */
1595	ret = charger_manager_register_extcon(cm);
1596	if (ret < 0) {
1597	dev_err(&pdev->dev, "Cannot initialize extcon device\n");
1598	goto err_reg_extcon;
1599	}
1600
1601	/* Add to the list */
1602	mutex_lock(&cm_list_mtx);
1603	list_add(new: &cm->entry, head: &cm_list);
1604	mutex_unlock(lock: &cm_list_mtx);
1605
1606	/*
1607	* Charger-manager is capable of waking up the system from sleep
1608	* when event is happened through cm_notify_event()
1609	*/
1610	device_init_wakeup(dev: &pdev->dev, enable: true);
1611	device_set_wakeup_capable(dev: &pdev->dev, capable: false);
1612
1613	/*
1614	* Charger-manager have to check the charging state right after
1615	* initialization of charger-manager and then update current charging
1616	* state.
1617	*/
1618	cm_monitor();
1619
1620	schedule_work(work: &setup_polling);
1621
1622	return 0;
1623
1624	err_reg_extcon:
1625	for (i = 0; i < desc->num_charger_regulators; i++)
1626	regulator_put(regulator: desc->charger_regulators[i].consumer);
1627
1628	power_supply_unregister(psy: cm->charger_psy);
1629
1630	return ret;
1631	}
1632
1633	static void charger_manager_remove(struct platform_device *pdev)
1634	{
1635	struct charger_manager *cm = platform_get_drvdata(pdev);
1636	struct charger_desc *desc = cm->desc;
1637	int i = 0;
1638
1639	/* Remove from the list */
1640	mutex_lock(&cm_list_mtx);
1641	list_del(entry: &cm->entry);
1642	mutex_unlock(lock: &cm_list_mtx);
1643
1644	cancel_work_sync(work: &setup_polling);
1645	cancel_delayed_work_sync(dwork: &cm_monitor_work);
1646
1647	for (i = 0 ; i < desc->num_charger_regulators ; i++)
1648	regulator_put(regulator: desc->charger_regulators[i].consumer);
1649
1650	power_supply_unregister(psy: cm->charger_psy);
1651
1652	try_charger_enable(cm, enable: false);
1653	}
1654
1655	static const struct platform_device_id charger_manager_id[] = {
1656	{ "charger-manager", 0 },
1657	{ },
1658	};
1659	MODULE_DEVICE_TABLE(platform, charger_manager_id);
1660
1661	static int cm_suspend_noirq(struct device *dev)
1662	{
1663	if (device_may_wakeup(dev)) {
1664	device_set_wakeup_capable(dev, capable: false);
1665	return -EAGAIN;
1666	}
1667
1668	return 0;
1669	}
1670
1671	static bool cm_need_to_awake(void)
1672	{
1673	struct charger_manager *cm;
1674
1675	if (cm_timer)
1676	return false;
1677
1678	mutex_lock(&cm_list_mtx);
1679	list_for_each_entry(cm, &cm_list, entry) {
1680	if (is_charging(cm)) {
1681	mutex_unlock(lock: &cm_list_mtx);
1682	return true;
1683	}
1684	}
1685	mutex_unlock(lock: &cm_list_mtx);
1686
1687	return false;
1688	}
1689
1690	static int cm_suspend_prepare(struct device *dev)
1691	{
1692	if (cm_need_to_awake())
1693	return -EBUSY;
1694
1695	if (!cm_suspended)
1696	cm_suspended = true;
1697
1698	cm_timer_set = cm_setup_timer();
1699
1700	if (cm_timer_set) {
1701	cancel_work_sync(work: &setup_polling);
1702	cancel_delayed_work_sync(dwork: &cm_monitor_work);
1703	}
1704
1705	return 0;
1706	}
1707
1708	static void cm_suspend_complete(struct device *dev)
1709	{
1710	struct charger_manager *cm = dev_get_drvdata(dev);
1711
1712	if (cm_suspended)
1713	cm_suspended = false;
1714
1715	if (cm_timer_set) {
1716	ktime_t remain;
1717
1718	alarm_cancel(alarm: cm_timer);
1719	cm_timer_set = false;
1720	remain = alarm_expires_remaining(alarm: cm_timer);
1721	cm_suspend_duration_ms -= ktime_to_ms(kt: remain);
1722	schedule_work(work: &setup_polling);
1723	}
1724
1725	_cm_monitor(cm);
1726
1727	device_set_wakeup_capable(dev: cm->dev, capable: false);
1728	}
1729
1730	static const struct dev_pm_ops charger_manager_pm = {
1731	.prepare = cm_suspend_prepare,
1732	.suspend_noirq = cm_suspend_noirq,
1733	.complete = cm_suspend_complete,
1734	};
1735
1736	static struct platform_driver charger_manager_driver = {
1737	.driver = {
1738	.name = "charger-manager",
1739	.pm = &charger_manager_pm,
1740	.of_match_table = charger_manager_match,
1741	},
1742	.probe = charger_manager_probe,
1743	.remove_new = charger_manager_remove,
1744	.id_table = charger_manager_id,
1745	};
1746
1747	static int __init charger_manager_init(void)
1748	{
1749	cm_wq = create_freezable_workqueue("charger_manager");
1750	if (unlikely(!cm_wq))
1751	return -ENOMEM;
1752
1753	INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
1754
1755	return platform_driver_register(&charger_manager_driver);
1756	}
1757	late_initcall(charger_manager_init);
1758
1759	static void __exit charger_manager_cleanup(void)
1760	{
1761	destroy_workqueue(wq: cm_wq);
1762	cm_wq = NULL;
1763
1764	platform_driver_unregister(&charger_manager_driver);
1765	}
1766	module_exit(charger_manager_cleanup);
1767
1768	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1769	MODULE_DESCRIPTION("Charger Manager");
1770	MODULE_LICENSE("GPL");
1771