?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm/rockchip: Don't change hdmi reference clock rate
[drm/drm-misc.git] / drivers / power / supply / charger-manager.c
bloba69faef444c042b45f7e8db63da3c11aff643071
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(cm->desc->psy_fuel_gauge);
110 if (!psy)
111 break;
112
113 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_PRESENT,
114 &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 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 POWER_SUPPLY_PROP_PRESENT, &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(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, POWER_SUPPLY_PROP_ONLINE,
168 &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(cm->desc->psy_fuel_gauge);
194 if (!fuel_gauge)
195 return -ENODEV;
196
197 ret = power_supply_get_property(fuel_gauge,
198 POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
199 power_supply_put(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 should 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(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, POWER_SUPPLY_PROP_ONLINE,
239 &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, POWER_SUPPLY_PROP_STATUS,
256 &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(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);
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(fuel_gauge,
315 POWER_SUPPLY_PROP_CHARGE_FULL, &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(fuel_gauge,
327 POWER_SUPPLY_PROP_CAPACITY, &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(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(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(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(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(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 desc->charger_regulators[i].consumer)) {
428 regulator_force_disable(
429 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(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(cm->desc->psy_fuel_gauge);
491 if (!fuel_gauge)
492 return -ENODEV;
493
494 ret = power_supply_get_property(fuel_gauge,
495 POWER_SUPPLY_PROP_TEMP,
496 (union power_supply_propval *)temp);
497 power_supply_put(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(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);
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, (target == POWER_SUPPLY_STATUS_CHARGING));
612
613 if (cm->battery_status != target) {
614 cm->battery_status = target;
615 power_supply_changed(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(&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(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(cm_wq, &cm_monitor_work, polling_jiffy);
688 next_polling = _next_polling;
689 } else {
690 if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
691 next_polling = _next_polling;
692 }
693 out:
694 mutex_unlock(&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(&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, &val->intval);
741 break;
742 case POWER_SUPPLY_PROP_CURRENT_NOW:
743 fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
744 if (!fuel_gauge) {
745 ret = -ENODEV;
746 break;
747 }
748 ret = power_supply_get_property(fuel_gauge,
749 POWER_SUPPLY_PROP_CURRENT_NOW, val);
750 break;
751 case POWER_SUPPLY_PROP_TEMP:
752 return cm_get_battery_temperature(cm, &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(cm->desc->psy_fuel_gauge);
761 if (!fuel_gauge) {
762 ret = -ENODEV;
763 break;
764 }
765
766 ret = power_supply_get_property(fuel_gauge,
767 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);
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(cm->desc->psy_fuel_gauge);
809 if (!fuel_gauge) {
810 ret = -ENODEV;
811 break;
812 }
813 ret = power_supply_get_property(fuel_gauge, psp, val);
814 break;
815 default:
816 return -EINVAL;
817 }
818 if (fuel_gauge)
819 power_supply_put(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(&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(wakeup_ms / MSEC_PER_SEC,
897 (wakeup_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
898 alarm_start(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(cable->charger->consumer,
921 cable->min_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(&cm_monitor_work);
934 queue_delayed_work(cm_wq, &cm_monitor_work, 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(&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(cable->extcon_name);
988 if (IS_ERR(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(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(cm->dev, cable->extcon_dev,
1008 cable->extcon_type, &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(cm->dev,
1041 charger->regulator_name);
1042 if (IS_ERR(charger->consumer)) {
1043 dev_err(cm->dev, "Cannot find charger(%s)\n",
1044 charger->regulator_name);
1045 return PTR_ERR(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(cable->extcon_dev,
1062 cable->extcon_type);
1063 charger_extcon_notifier(&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, "%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(charger->consumer);
1090
1091 return sysfs_emit(buf, "%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, "%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(charger->cm, false);
1143 charger->externally_control = externally_control;
1144 try_charger_enable(charger->cm, 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(cm->dev, GFP_KERNEL, "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(fuel_gauge,
1241 POWER_SUPPLY_PROP_TEMP, &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(desc->thermal_zone);
1252 if (IS_ERR(cm->tzd_batt))
1253 return PTR_ERR(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, sizeof(*desc), GFP_KERNEL);
1290 if (!desc)
1291 return ERR_PTR(-ENOMEM);
1292
1293 of_property_read_string(np, "cm-name", &desc->psy_name);
1294
1295 of_property_read_u32(np, "cm-poll-mode", &poll_mode);
1296 desc->polling_mode = poll_mode;
1297
1298 of_property_read_u32(np, "cm-poll-interval",
1299 &desc->polling_interval_ms);
1300
1301 of_property_read_u32(np, "cm-fullbatt-vchkdrop-volt",
1302 &desc->fullbatt_vchkdrop_uV);
1303 of_property_read_u32(np, "cm-fullbatt-voltage", &desc->fullbatt_uV);
1304 of_property_read_u32(np, "cm-fullbatt-soc", &desc->fullbatt_soc);
1305 of_property_read_u32(np, "cm-fullbatt-capacity",
1306 &desc->fullbatt_full_capacity);
1307
1308 of_property_read_u32(np, "cm-battery-stat", &battery_stat);
1309 desc->battery_present = battery_stat;
1310
1311 /* chargers */
1312 num_chgs = of_property_count_strings(np, "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 num_chgs + 1,
1319 sizeof(char *),
1320 GFP_KERNEL);
1321 if (!desc->psy_charger_stat)
1322 return ERR_PTR(-ENOMEM);
1323
1324 for (i = 0; i < num_chgs; i++)
1325 of_property_read_string_index(np, "cm-chargers",
1326 i, &desc->psy_charger_stat[i]);
1327 }
1328
1329 of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
1330
1331 of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
1332
1333 of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
1334 if (of_property_read_bool(np, "cm-battery-cold-in-minus"))
1335 desc->temp_min *= -1;
1336 of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
1337 of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);
1338
1339 of_property_read_u32(np, "cm-charging-max",
1340 &desc->charging_max_duration_ms);
1341 of_property_read_u32(np, "cm-discharging-max",
1342 &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 desc->num_charger_regulators,
1352 sizeof(*chg_regs),
1353 GFP_KERNEL);
1354 if (!chg_regs)
1355 return ERR_PTR(-ENOMEM);
1356
1357 desc->charger_regulators = chg_regs;
1358
1359 desc->sysfs_groups = devm_kcalloc(dev,
1360 desc->num_charger_regulators + 1,
1361 sizeof(*desc->sysfs_groups),
1362 GFP_KERNEL);
1363 if (!desc->sysfs_groups)
1364 return ERR_PTR(-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(child, "cm-regulator-name",
1371 &chg_regs->regulator_name);
1372
1373 /* charger cables */
1374 chg_regs->num_cables = of_get_child_count(child);
1375 if (chg_regs->num_cables) {
1376 cables = devm_kcalloc(dev,
1377 chg_regs->num_cables,
1378 sizeof(*cables),
1379 GFP_KERNEL);
1380 if (!cables) {
1381 of_node_put(child);
1382 return ERR_PTR(-ENOMEM);
1383 }
1384
1385 chg_regs->cables = cables;
1386
1387 for_each_child_of_node(child, _child) {
1388 of_property_read_string(_child,
1389 "cm-cable-name", &cables->name);
1390 of_property_read_string(_child,
1391 "cm-cable-extcon",
1392 &cables->extcon_name);
1393 of_property_read_u32(_child,
1394 "cm-cable-min",
1395 &cables->min_uA);
1396 of_property_read_u32(_child,
1397 "cm-cable-max",
1398 &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(&pdev->dev);
1412 return dev_get_platdata(&pdev->dev);
1413 }
1414
1415 static void cm_timer_func(struct alarm *alarm, ktime_t now)
1416 {
1417 cm_timer_set = false;
1418 }
1419
1420 static int charger_manager_probe(struct platform_device *pdev)
1421 {
1422 struct charger_desc *desc = cm_get_drv_data(pdev);
1423 struct charger_manager *cm;
1424 int ret, i = 0;
1425 union power_supply_propval val;
1426 struct power_supply *fuel_gauge;
1427 enum power_supply_property *properties;
1428 size_t num_properties;
1429 struct power_supply_config psy_cfg = {};
1430
1431 if (IS_ERR(desc)) {
1432 dev_err(&pdev->dev, "No platform data (desc) found\n");
1433 return PTR_ERR(desc);
1434 }
1435
1436 cm = devm_kzalloc(&pdev->dev, sizeof(*cm), GFP_KERNEL);
1437 if (!cm)
1438 return -ENOMEM;
1439
1440 /* Basic Values. Unspecified are Null or 0 */
1441 cm->dev = &pdev->dev;
1442 cm->desc = desc;
1443 psy_cfg.drv_data = cm;
1444
1445 /* Initialize alarm timer */
1446 if (alarmtimer_get_rtcdev()) {
1447 cm_timer = devm_kzalloc(cm->dev, sizeof(*cm_timer), GFP_KERNEL);
1448 if (!cm_timer)
1449 return -ENOMEM;
1450 alarm_init(cm_timer, ALARM_BOOTTIME, cm_timer_func);
1451 }
1452
1453 /*
1454 * Some of the following do not need to be errors.
1455 * Users may intentionally ignore those features.
1456 */
1457 if (desc->fullbatt_uV == 0) {
1458 dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
1459 }
1460 if (!desc->fullbatt_vchkdrop_uV) {
1461 dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
1462 desc->fullbatt_vchkdrop_uV = 0;
1463 }
1464 if (desc->fullbatt_soc == 0) {
1465 dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
1466 }
1467 if (desc->fullbatt_full_capacity == 0) {
1468 dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
1469 }
1470
1471 if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1472 dev_err(&pdev->dev, "charger_regulators undefined\n");
1473 return -EINVAL;
1474 }
1475
1476 if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1477 dev_err(&pdev->dev, "No power supply defined\n");
1478 return -EINVAL;
1479 }
1480
1481 if (!desc->psy_fuel_gauge) {
1482 dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
1483 return -EINVAL;
1484 }
1485
1486 /* Check if charger's supplies are present at probe */
1487 for (i = 0; desc->psy_charger_stat[i]; i++) {
1488 struct power_supply *psy;
1489
1490 psy = power_supply_get_by_name(desc->psy_charger_stat[i]);
1491 if (!psy) {
1492 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1493 desc->psy_charger_stat[i]);
1494 return -ENODEV;
1495 }
1496 power_supply_put(psy);
1497 }
1498
1499 if (cm->desc->polling_mode != CM_POLL_DISABLE &&
1500 (desc->polling_interval_ms == 0 ||
1501 msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL)) {
1502 dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1503 return -EINVAL;
1504 }
1505
1506 if (!desc->charging_max_duration_ms ||
1507 !desc->discharging_max_duration_ms) {
1508 dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
1509 desc->charging_max_duration_ms = 0;
1510 desc->discharging_max_duration_ms = 0;
1511 }
1512
1513 platform_set_drvdata(pdev, cm);
1514
1515 memcpy(&cm->charger_psy_desc, &psy_default, sizeof(psy_default));
1516
1517 if (!desc->psy_name)
1518 strscpy(cm->psy_name_buf, psy_default.name,
1519 sizeof(cm->psy_name_buf));
1520 else
1521 strscpy(cm->psy_name_buf, desc->psy_name,
1522 sizeof(cm->psy_name_buf));
1523 cm->charger_psy_desc.name = cm->psy_name_buf;
1524
1525 /* Allocate for psy properties because they may vary */
1526 properties = devm_kcalloc(&pdev->dev,
1527 ARRAY_SIZE(default_charger_props) +
1528 NUM_CHARGER_PSY_OPTIONAL,
1529 sizeof(*properties), GFP_KERNEL);
1530 if (!properties)
1531 return -ENOMEM;
1532
1533 memcpy(properties, default_charger_props,
1534 sizeof(enum power_supply_property) *
1535 ARRAY_SIZE(default_charger_props));
1536 num_properties = ARRAY_SIZE(default_charger_props);
1537
1538 /* Find which optional psy-properties are available */
1539 fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
1540 if (!fuel_gauge) {
1541 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1542 desc->psy_fuel_gauge);
1543 return -ENODEV;
1544 }
1545 if (!power_supply_get_property(fuel_gauge,
1546 POWER_SUPPLY_PROP_CHARGE_FULL, &val)) {
1547 properties[num_properties] =
1548 POWER_SUPPLY_PROP_CHARGE_FULL;
1549 num_properties++;
1550 }
1551 if (!power_supply_get_property(fuel_gauge,
1552 POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
1553 properties[num_properties] =
1554 POWER_SUPPLY_PROP_CHARGE_NOW;
1555 num_properties++;
1556 }
1557 if (!power_supply_get_property(fuel_gauge,
1558 POWER_SUPPLY_PROP_CURRENT_NOW,
1559 &val)) {
1560 properties[num_properties] =
1561 POWER_SUPPLY_PROP_CURRENT_NOW;
1562 num_properties++;
1563 }
1564
1565 ret = cm_init_thermal_data(cm, fuel_gauge, properties, &num_properties);
1566 if (ret) {
1567 dev_err(&pdev->dev, "Failed to initialize thermal data\n");
1568 cm->desc->measure_battery_temp = false;
1569 }
1570 power_supply_put(fuel_gauge);
1571
1572 cm->charger_psy_desc.properties = properties;
1573 cm->charger_psy_desc.num_properties = num_properties;
1574
1575 /* Register sysfs entry for charger(regulator) */
1576 ret = charger_manager_prepare_sysfs(cm);
1577 if (ret < 0) {
1578 dev_err(&pdev->dev,
1579 "Cannot prepare sysfs entry of regulators\n");
1580 return ret;
1581 }
1582 psy_cfg.attr_grp = desc->sysfs_groups;
1583
1584 cm->charger_psy = power_supply_register(&pdev->dev,
1585 &cm->charger_psy_desc,
1586 &psy_cfg);
1587 if (IS_ERR(cm->charger_psy)) {
1588 dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
1589 cm->charger_psy_desc.name);
1590 return PTR_ERR(cm->charger_psy);
1591 }
1592
1593 /* Register extcon device for charger cable */
1594 ret = charger_manager_register_extcon(cm);
1595 if (ret < 0) {
1596 dev_err(&pdev->dev, "Cannot initialize extcon device\n");
1597 goto err_reg_extcon;
1598 }
1599
1600 /* Add to the list */
1601 mutex_lock(&cm_list_mtx);
1602 list_add(&cm->entry, &cm_list);
1603 mutex_unlock(&cm_list_mtx);
1604
1605 /*
1606 * Charger-manager is capable of waking up the system from sleep
1607 * when event is happened through cm_notify_event()
1608 */
1609 device_init_wakeup(&pdev->dev, true);
1610 device_set_wakeup_capable(&pdev->dev, false);
1611
1612 /*
1613 * Charger-manager have to check the charging state right after
1614 * initialization of charger-manager and then update current charging
1615 * state.
1616 */
1617 cm_monitor();
1618
1619 schedule_work(&setup_polling);
1620
1621 return 0;
1622
1623 err_reg_extcon:
1624 for (i = 0; i < desc->num_charger_regulators; i++)
1625 regulator_put(desc->charger_regulators[i].consumer);
1626
1627 power_supply_unregister(cm->charger_psy);
1628
1629 return ret;
1630 }
1631
1632 static void charger_manager_remove(struct platform_device *pdev)
1633 {
1634 struct charger_manager *cm = platform_get_drvdata(pdev);
1635 struct charger_desc *desc = cm->desc;
1636 int i = 0;
1637
1638 /* Remove from the list */
1639 mutex_lock(&cm_list_mtx);
1640 list_del(&cm->entry);
1641 mutex_unlock(&cm_list_mtx);
1642
1643 cancel_work_sync(&setup_polling);
1644 cancel_delayed_work_sync(&cm_monitor_work);
1645
1646 for (i = 0 ; i < desc->num_charger_regulators ; i++)
1647 regulator_put(desc->charger_regulators[i].consumer);
1648
1649 power_supply_unregister(cm->charger_psy);
1650
1651 try_charger_enable(cm, false);
1652 }
1653
1654 static const struct platform_device_id charger_manager_id[] = {
1655 { "charger-manager", 0 },
1656 { },
1657 };
1658 MODULE_DEVICE_TABLE(platform, charger_manager_id);
1659
1660 static int cm_suspend_noirq(struct device *dev)
1661 {
1662 if (device_may_wakeup(dev)) {
1663 device_set_wakeup_capable(dev, false);
1664 return -EAGAIN;
1665 }
1666
1667 return 0;
1668 }
1669
1670 static bool cm_need_to_awake(void)
1671 {
1672 struct charger_manager *cm;
1673
1674 if (cm_timer)
1675 return false;
1676
1677 mutex_lock(&cm_list_mtx);
1678 list_for_each_entry(cm, &cm_list, entry) {
1679 if (is_charging(cm)) {
1680 mutex_unlock(&cm_list_mtx);
1681 return true;
1682 }
1683 }
1684 mutex_unlock(&cm_list_mtx);
1685
1686 return false;
1687 }
1688
1689 static int cm_suspend_prepare(struct device *dev)
1690 {
1691 if (cm_need_to_awake())
1692 return -EBUSY;
1693
1694 if (!cm_suspended)
1695 cm_suspended = true;
1696
1697 cm_timer_set = cm_setup_timer();
1698
1699 if (cm_timer_set) {
1700 cancel_work_sync(&setup_polling);
1701 cancel_delayed_work_sync(&cm_monitor_work);
1702 }
1703
1704 return 0;
1705 }
1706
1707 static void cm_suspend_complete(struct device *dev)
1708 {
1709 struct charger_manager *cm = dev_get_drvdata(dev);
1710
1711 if (cm_suspended)
1712 cm_suspended = false;
1713
1714 if (cm_timer_set) {
1715 ktime_t remain;
1716
1717 alarm_cancel(cm_timer);
1718 cm_timer_set = false;
1719 remain = alarm_expires_remaining(cm_timer);
1720 cm_suspend_duration_ms -= ktime_to_ms(remain);
1721 schedule_work(&setup_polling);
1722 }
1723
1724 _cm_monitor(cm);
1725
1726 device_set_wakeup_capable(cm->dev, false);
1727 }
1728
1729 static const struct dev_pm_ops charger_manager_pm = {
1730 .prepare = cm_suspend_prepare,
1731 .suspend_noirq = cm_suspend_noirq,
1732 .complete = cm_suspend_complete,
1733 };
1734
1735 static struct platform_driver charger_manager_driver = {
1736 .driver = {
1737 .name = "charger-manager",
1738 .pm = &charger_manager_pm,
1739 .of_match_table = charger_manager_match,
1740 },
1741 .probe = charger_manager_probe,
1742 .remove = charger_manager_remove,
1743 .id_table = charger_manager_id,
1744 };
1745
1746 static int __init charger_manager_init(void)
1747 {
1748 cm_wq = create_freezable_workqueue("charger_manager");
1749 if (unlikely(!cm_wq))
1750 return -ENOMEM;
1751
1752 INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
1753
1754 return platform_driver_register(&charger_manager_driver);
1755 }
1756 late_initcall(charger_manager_init);
1757
1758 static void __exit charger_manager_cleanup(void)
1759 {
1760 destroy_workqueue(cm_wq);
1761 cm_wq = NULL;
1762
1763 platform_driver_unregister(&charger_manager_driver);
1764 }
1765 module_exit(charger_manager_cleanup);
1766
1767 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1768 MODULE_DESCRIPTION("Charger Manager");
1769 MODULE_LICENSE("GPL");
Kernel DRM miscellaneous fixes and cross-tree changes