blob: 8acc3f8d303c70876e9e53e01a3dffa985cddc44 [file] [log] [blame]
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001/*
2 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
3 * MyungJoo Ham <myungjoo.ham@samsung.com>
4 *
5 * This driver enables to monitor battery health and control charger
6 * during suspend-to-mem.
7 * Charger manager depends on other devices. register this later than
8 * the depending devices.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13**/
14
15#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>
Chanwoo Choi3950c782012-09-21 18:49:37 +090025#include <linux/sysfs.h>
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +090026
Chanwoo Choidfeccb12012-05-05 06:26:47 -070027static const char * const default_event_names[] = {
28 [CM_EVENT_UNKNOWN] = "Unknown",
29 [CM_EVENT_BATT_FULL] = "Battery Full",
30 [CM_EVENT_BATT_IN] = "Battery Inserted",
31 [CM_EVENT_BATT_OUT] = "Battery Pulled Out",
32 [CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
33 [CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
34 [CM_EVENT_OTHERS] = "Other battery events"
35};
36
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +090037/*
38 * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
39 * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
40 * without any delays.
41 */
42#define CM_JIFFIES_SMALL (2)
43
44/* If y is valid (> 0) and smaller than x, do x = y */
45#define CM_MIN_VALID(x, y) x = (((y > 0) && ((x) > (y))) ? (y) : (x))
46
47/*
48 * Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
49 * rtc alarm. It should be 2 or larger
50 */
51#define CM_RTC_SMALL (2)
52
53#define UEVENT_BUF_SIZE 32
54
55static LIST_HEAD(cm_list);
56static DEFINE_MUTEX(cm_list_mtx);
57
58/* About in-suspend (suspend-again) monitoring */
59static struct rtc_device *rtc_dev;
60/*
61 * Backup RTC alarm
62 * Save the wakeup alarm before entering suspend-to-RAM
63 */
64static struct rtc_wkalrm rtc_wkalarm_save;
65/* Backup RTC alarm time in terms of seconds since 01-01-1970 00:00:00 */
66static unsigned long rtc_wkalarm_save_time;
67static bool cm_suspended;
68static bool cm_rtc_set;
69static unsigned long cm_suspend_duration_ms;
70
Chanwoo Choid829dc72012-05-05 06:24:10 -070071/* About normal (not suspended) monitoring */
72static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
73static unsigned long next_polling; /* Next appointed polling time */
74static struct workqueue_struct *cm_wq; /* init at driver add */
75static struct delayed_work cm_monitor_work; /* init at driver add */
76
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +090077/* Global charger-manager description */
78static struct charger_global_desc *g_desc; /* init with setup_charger_manager */
79
80/**
81 * is_batt_present - See if the battery presents in place.
82 * @cm: the Charger Manager representing the battery.
83 */
84static bool is_batt_present(struct charger_manager *cm)
85{
86 union power_supply_propval val;
87 bool present = false;
88 int i, ret;
89
90 switch (cm->desc->battery_present) {
Chanwoo Choid829dc72012-05-05 06:24:10 -070091 case CM_BATTERY_PRESENT:
92 present = true;
93 break;
94 case CM_NO_BATTERY:
95 break;
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +090096 case CM_FUEL_GAUGE:
97 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
98 POWER_SUPPLY_PROP_PRESENT, &val);
99 if (ret == 0 && val.intval)
100 present = true;
101 break;
102 case CM_CHARGER_STAT:
103 for (i = 0; cm->charger_stat[i]; i++) {
104 ret = cm->charger_stat[i]->get_property(
105 cm->charger_stat[i],
106 POWER_SUPPLY_PROP_PRESENT, &val);
107 if (ret == 0 && val.intval) {
108 present = true;
109 break;
110 }
111 }
112 break;
113 }
114
115 return present;
116}
117
118/**
119 * is_ext_pwr_online - See if an external power source is attached to charge
120 * @cm: the Charger Manager representing the battery.
121 *
122 * Returns true if at least one of the chargers of the battery has an external
123 * power source attached to charge the battery regardless of whether it is
124 * actually charging or not.
125 */
126static bool is_ext_pwr_online(struct charger_manager *cm)
127{
128 union power_supply_propval val;
129 bool online = false;
130 int i, ret;
131
132 /* If at least one of them has one, it's yes. */
133 for (i = 0; cm->charger_stat[i]; i++) {
134 ret = cm->charger_stat[i]->get_property(
135 cm->charger_stat[i],
136 POWER_SUPPLY_PROP_ONLINE, &val);
137 if (ret == 0 && val.intval) {
138 online = true;
139 break;
140 }
141 }
142
143 return online;
144}
145
146/**
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900147 * get_batt_uV - Get the voltage level of the battery
148 * @cm: the Charger Manager representing the battery.
149 * @uV: the voltage level returned.
150 *
151 * Returns 0 if there is no error.
152 * Returns a negative value on error.
153 */
154static int get_batt_uV(struct charger_manager *cm, int *uV)
155{
156 union power_supply_propval val;
157 int ret;
158
Axel Linbb2a95c2012-01-12 12:56:35 +0800159 if (!cm->fuel_gauge)
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900160 return -ENODEV;
161
Axel Linbb2a95c2012-01-12 12:56:35 +0800162 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
163 POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900164 if (ret)
165 return ret;
166
167 *uV = val.intval;
168 return 0;
169}
170
171/**
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900172 * is_charging - Returns true if the battery is being charged.
173 * @cm: the Charger Manager representing the battery.
174 */
175static bool is_charging(struct charger_manager *cm)
176{
177 int i, ret;
178 bool charging = false;
179 union power_supply_propval val;
180
181 /* If there is no battery, it cannot be charged */
182 if (!is_batt_present(cm))
183 return false;
184
185 /* If at least one of the charger is charging, return yes */
186 for (i = 0; cm->charger_stat[i]; i++) {
187 /* 1. The charger sholuld not be DISABLED */
188 if (cm->emergency_stop)
189 continue;
190 if (!cm->charger_enabled)
191 continue;
192
193 /* 2. The charger should be online (ext-power) */
194 ret = cm->charger_stat[i]->get_property(
195 cm->charger_stat[i],
196 POWER_SUPPLY_PROP_ONLINE, &val);
197 if (ret) {
198 dev_warn(cm->dev, "Cannot read ONLINE value from %s.\n",
199 cm->desc->psy_charger_stat[i]);
200 continue;
201 }
202 if (val.intval == 0)
203 continue;
204
205 /*
206 * 3. The charger should not be FULL, DISCHARGING,
207 * or NOT_CHARGING.
208 */
209 ret = cm->charger_stat[i]->get_property(
210 cm->charger_stat[i],
211 POWER_SUPPLY_PROP_STATUS, &val);
212 if (ret) {
213 dev_warn(cm->dev, "Cannot read STATUS value from %s.\n",
214 cm->desc->psy_charger_stat[i]);
215 continue;
216 }
217 if (val.intval == POWER_SUPPLY_STATUS_FULL ||
218 val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
219 val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
220 continue;
221
222 /* Then, this is charging. */
223 charging = true;
224 break;
225 }
226
227 return charging;
228}
229
230/**
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900231 * is_full_charged - Returns true if the battery is fully charged.
232 * @cm: the Charger Manager representing the battery.
233 */
234static bool is_full_charged(struct charger_manager *cm)
235{
236 struct charger_desc *desc = cm->desc;
237 union power_supply_propval val;
238 int ret = 0;
239 int uV;
240
241 /* If there is no battery, it cannot be charged */
Chanwoo Choi0fa11db2012-11-22 16:53:46 +0900242 if (!is_batt_present(cm))
243 return false;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900244
245 if (cm->fuel_gauge && desc->fullbatt_full_capacity > 0) {
Chanwoo Choi0fa11db2012-11-22 16:53:46 +0900246 val.intval = 0;
247
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900248 /* Not full if capacity of fuel gauge isn't full */
249 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
250 POWER_SUPPLY_PROP_CHARGE_FULL, &val);
Chanwoo Choi0fa11db2012-11-22 16:53:46 +0900251 if (!ret && val.intval > desc->fullbatt_full_capacity)
252 return true;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900253 }
254
255 /* Full, if it's over the fullbatt voltage */
256 if (desc->fullbatt_uV > 0) {
257 ret = get_batt_uV(cm, &uV);
Chanwoo Choi0fa11db2012-11-22 16:53:46 +0900258 if (!ret && uV >= desc->fullbatt_uV)
259 return true;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900260 }
261
262 /* Full, if the capacity is more than fullbatt_soc */
263 if (cm->fuel_gauge && desc->fullbatt_soc > 0) {
Chanwoo Choi0fa11db2012-11-22 16:53:46 +0900264 val.intval = 0;
265
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900266 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
267 POWER_SUPPLY_PROP_CAPACITY, &val);
Chanwoo Choi0fa11db2012-11-22 16:53:46 +0900268 if (!ret && val.intval >= desc->fullbatt_soc)
269 return true;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900270 }
271
Chanwoo Choi0fa11db2012-11-22 16:53:46 +0900272 return false;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900273}
274
275/**
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900276 * is_polling_required - Return true if need to continue polling for this CM.
277 * @cm: the Charger Manager representing the battery.
278 */
279static bool is_polling_required(struct charger_manager *cm)
280{
281 switch (cm->desc->polling_mode) {
282 case CM_POLL_DISABLE:
283 return false;
284 case CM_POLL_ALWAYS:
285 return true;
286 case CM_POLL_EXTERNAL_POWER_ONLY:
287 return is_ext_pwr_online(cm);
288 case CM_POLL_CHARGING_ONLY:
289 return is_charging(cm);
290 default:
291 dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
292 cm->desc->polling_mode);
293 }
294
295 return false;
296}
297
298/**
299 * try_charger_enable - Enable/Disable chargers altogether
300 * @cm: the Charger Manager representing the battery.
301 * @enable: true: enable / false: disable
302 *
303 * Note that Charger Manager keeps the charger enabled regardless whether
304 * the charger is charging or not (because battery is full or no external
305 * power source exists) except when CM needs to disable chargers forcibly
306 * bacause of emergency causes; when the battery is overheated or too cold.
307 */
308static int try_charger_enable(struct charger_manager *cm, bool enable)
309{
310 int err = 0, i;
311 struct charger_desc *desc = cm->desc;
312
313 /* Ignore if it's redundent command */
Axel Linbb2a95c2012-01-12 12:56:35 +0800314 if (enable == cm->charger_enabled)
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900315 return 0;
316
317 if (enable) {
318 if (cm->emergency_stop)
319 return -EAGAIN;
Chanwoo Choi8fcfe082012-09-20 21:20:05 -0700320
321 /*
322 * Save start time of charging to limit
323 * maximum possible charging time.
324 */
325 cm->charging_start_time = ktime_to_ms(ktime_get());
326 cm->charging_end_time = 0;
327
Chanwoo Choidbb61fc2012-07-27 14:01:34 +0900328 for (i = 0 ; i < desc->num_charger_regulators ; i++) {
Chanwoo Choi3950c782012-09-21 18:49:37 +0900329 if (desc->charger_regulators[i].externally_control)
330 continue;
331
Chanwoo Choidbb61fc2012-07-27 14:01:34 +0900332 err = regulator_enable(desc->charger_regulators[i].consumer);
333 if (err < 0) {
334 dev_warn(cm->dev,
335 "Cannot enable %s regulator\n",
336 desc->charger_regulators[i].regulator_name);
337 }
338 }
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900339 } else {
340 /*
Chanwoo Choi8fcfe082012-09-20 21:20:05 -0700341 * Save end time of charging to maintain fully charged state
342 * of battery after full-batt.
343 */
344 cm->charging_start_time = 0;
345 cm->charging_end_time = ktime_to_ms(ktime_get());
346
Chanwoo Choidbb61fc2012-07-27 14:01:34 +0900347 for (i = 0 ; i < desc->num_charger_regulators ; i++) {
Chanwoo Choi3950c782012-09-21 18:49:37 +0900348 if (desc->charger_regulators[i].externally_control)
349 continue;
350
Chanwoo Choidbb61fc2012-07-27 14:01:34 +0900351 err = regulator_disable(desc->charger_regulators[i].consumer);
352 if (err < 0) {
353 dev_warn(cm->dev,
354 "Cannot disable %s regulator\n",
355 desc->charger_regulators[i].regulator_name);
356 }
357 }
358
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900359 /*
360 * Abnormal battery state - Stop charging forcibly,
361 * even if charger was enabled at the other places
362 */
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900363 for (i = 0; i < desc->num_charger_regulators; i++) {
364 if (regulator_is_enabled(
365 desc->charger_regulators[i].consumer)) {
366 regulator_force_disable(
367 desc->charger_regulators[i].consumer);
368 dev_warn(cm->dev,
369 "Disable regulator(%s) forcibly.\n",
Chanwoo Choibee737b2012-07-12 15:03:25 +0900370 desc->charger_regulators[i].regulator_name);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900371 }
372 }
373 }
374
375 if (!err)
376 cm->charger_enabled = enable;
377
378 return err;
379}
380
381/**
Chanwoo Choid829dc72012-05-05 06:24:10 -0700382 * try_charger_restart - Restart charging.
383 * @cm: the Charger Manager representing the battery.
384 *
385 * Restart charging by turning off and on the charger.
386 */
387static int try_charger_restart(struct charger_manager *cm)
388{
389 int err;
390
391 if (cm->emergency_stop)
392 return -EAGAIN;
393
394 err = try_charger_enable(cm, false);
395 if (err)
396 return err;
397
398 return try_charger_enable(cm, true);
399}
400
401/**
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900402 * uevent_notify - Let users know something has changed.
403 * @cm: the Charger Manager representing the battery.
404 * @event: the event string.
405 *
406 * If @event is null, it implies that uevent_notify is called
407 * by resume function. When called in the resume function, cm_suspended
408 * should be already reset to false in order to let uevent_notify
409 * notify the recent event during the suspend to users. While
410 * suspended, uevent_notify does not notify users, but tracks
411 * events so that uevent_notify can notify users later after resumed.
412 */
413static void uevent_notify(struct charger_manager *cm, const char *event)
414{
415 static char env_str[UEVENT_BUF_SIZE + 1] = "";
416 static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
417
418 if (cm_suspended) {
419 /* Nothing in suspended-event buffer */
420 if (env_str_save[0] == 0) {
421 if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
422 return; /* status not changed */
423 strncpy(env_str_save, event, UEVENT_BUF_SIZE);
424 return;
425 }
426
427 if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
428 return; /* Duplicated. */
Axel Linbb2a95c2012-01-12 12:56:35 +0800429 strncpy(env_str_save, event, UEVENT_BUF_SIZE);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900430 return;
431 }
432
433 if (event == NULL) {
434 /* No messages pending */
435 if (!env_str_save[0])
436 return;
437
438 strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
439 kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
440 env_str_save[0] = 0;
441
442 return;
443 }
444
445 /* status not changed */
446 if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
447 return;
448
449 /* save the status and notify the update */
450 strncpy(env_str, event, UEVENT_BUF_SIZE);
451 kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
452
453 dev_info(cm->dev, event);
454}
455
456/**
Chanwoo Choid829dc72012-05-05 06:24:10 -0700457 * fullbatt_vchk - Check voltage drop some times after "FULL" event.
458 * @work: the work_struct appointing the function
459 *
460 * If a user has designated "fullbatt_vchkdrop_ms/uV" values with
461 * charger_desc, Charger Manager checks voltage drop after the battery
462 * "FULL" event. It checks whether the voltage has dropped more than
463 * fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
464 */
465static void fullbatt_vchk(struct work_struct *work)
466{
467 struct delayed_work *dwork = to_delayed_work(work);
468 struct charger_manager *cm = container_of(dwork,
469 struct charger_manager, fullbatt_vchk_work);
470 struct charger_desc *desc = cm->desc;
471 int batt_uV, err, diff;
472
473 /* remove the appointment for fullbatt_vchk */
474 cm->fullbatt_vchk_jiffies_at = 0;
475
476 if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
477 return;
478
479 err = get_batt_uV(cm, &batt_uV);
480 if (err) {
481 dev_err(cm->dev, "%s: get_batt_uV error(%d).\n", __func__, err);
482 return;
483 }
484
Chanwoo Choif36b9dd2012-11-22 16:53:51 +0900485 diff = desc->fullbatt_uV - batt_uV;
486 if (diff < 0)
487 return;
Chanwoo Choid829dc72012-05-05 06:24:10 -0700488
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900489 dev_info(cm->dev, "VBATT dropped %duV after full-batt.\n", diff);
Chanwoo Choid829dc72012-05-05 06:24:10 -0700490
491 if (diff > desc->fullbatt_vchkdrop_uV) {
492 try_charger_restart(cm);
Chanwoo Choi8fcfe082012-09-20 21:20:05 -0700493 uevent_notify(cm, "Recharging");
Chanwoo Choid829dc72012-05-05 06:24:10 -0700494 }
495}
496
497/**
Chanwoo Choi8fcfe082012-09-20 21:20:05 -0700498 * check_charging_duration - Monitor charging/discharging duration
499 * @cm: the Charger Manager representing the battery.
500 *
501 * If whole charging duration exceed 'charging_max_duration_ms',
502 * cm stop charging to prevent overcharge/overheat. If discharging
503 * duration exceed 'discharging _max_duration_ms', charger cable is
504 * attached, after full-batt, cm start charging to maintain fully
505 * charged state for battery.
506 */
507static int check_charging_duration(struct charger_manager *cm)
508{
509 struct charger_desc *desc = cm->desc;
510 u64 curr = ktime_to_ms(ktime_get());
511 u64 duration;
512 int ret = false;
513
514 if (!desc->charging_max_duration_ms &&
515 !desc->discharging_max_duration_ms)
516 return ret;
517
518 if (cm->charger_enabled) {
519 duration = curr - cm->charging_start_time;
520
521 if (duration > desc->charging_max_duration_ms) {
522 dev_info(cm->dev, "Charging duration exceed %lldms",
523 desc->charging_max_duration_ms);
524 uevent_notify(cm, "Discharging");
525 try_charger_enable(cm, false);
526 ret = true;
527 }
528 } else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
529 duration = curr - cm->charging_end_time;
530
531 if (duration > desc->charging_max_duration_ms &&
532 is_ext_pwr_online(cm)) {
533 dev_info(cm->dev, "DisCharging duration exceed %lldms",
534 desc->discharging_max_duration_ms);
535 uevent_notify(cm, "Recharing");
536 try_charger_enable(cm, true);
537 ret = true;
538 }
539 }
540
541 return ret;
542}
543
544/**
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900545 * _cm_monitor - Monitor the temperature and return true for exceptions.
546 * @cm: the Charger Manager representing the battery.
547 *
548 * Returns true if there is an event to notify for the battery.
549 * (True if the status of "emergency_stop" changes)
550 */
551static bool _cm_monitor(struct charger_manager *cm)
552{
553 struct charger_desc *desc = cm->desc;
554 int temp = desc->temperature_out_of_range(&cm->last_temp_mC);
555
556 dev_dbg(cm->dev, "monitoring (%2.2d.%3.3dC)\n",
557 cm->last_temp_mC / 1000, cm->last_temp_mC % 1000);
558
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900559 /* It has been stopped already */
560 if (temp && cm->emergency_stop)
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900561 return false;
562
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900563 /*
564 * Check temperature whether overheat or cold.
565 * If temperature is out of range normal state, stop charging.
566 */
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900567 if (temp) {
568 cm->emergency_stop = temp;
569 if (!try_charger_enable(cm, false)) {
570 if (temp > 0)
571 uevent_notify(cm, "OVERHEAT");
572 else
573 uevent_notify(cm, "COLD");
574 }
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900575
576 /*
Chanwoo Choi8fcfe082012-09-20 21:20:05 -0700577 * Check whole charging duration and discharing duration
578 * after full-batt.
579 */
580 } else if (!cm->emergency_stop && check_charging_duration(cm)) {
581 dev_dbg(cm->dev,
582 "Charging/Discharging duration is out of range");
583 /*
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900584 * Check dropped voltage of battery. If battery voltage is more
585 * dropped than fullbatt_vchkdrop_uV after fully charged state,
586 * charger-manager have to recharge battery.
587 */
588 } else if (!cm->emergency_stop && is_ext_pwr_online(cm) &&
589 !cm->charger_enabled) {
590 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
591
592 /*
593 * Check whether fully charged state to protect overcharge
594 * if charger-manager is charging for battery.
595 */
596 } else if (!cm->emergency_stop && is_full_charged(cm) &&
597 cm->charger_enabled) {
598 dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged.\n");
599 uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
600
601 try_charger_enable(cm, false);
602
603 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900604 } else {
605 cm->emergency_stop = 0;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900606 if (is_ext_pwr_online(cm)) {
607 if (!try_charger_enable(cm, true))
608 uevent_notify(cm, "CHARGING");
609 }
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900610 }
611
612 return true;
613}
614
615/**
616 * cm_monitor - Monitor every battery.
617 *
618 * Returns true if there is an event to notify from any of the batteries.
619 * (True if the status of "emergency_stop" changes)
620 */
621static bool cm_monitor(void)
622{
623 bool stop = false;
624 struct charger_manager *cm;
625
626 mutex_lock(&cm_list_mtx);
627
Axel Linbb2a95c2012-01-12 12:56:35 +0800628 list_for_each_entry(cm, &cm_list, entry) {
629 if (_cm_monitor(cm))
630 stop = true;
631 }
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900632
633 mutex_unlock(&cm_list_mtx);
634
635 return stop;
636}
637
Chanwoo Choid829dc72012-05-05 06:24:10 -0700638/**
639 * _setup_polling - Setup the next instance of polling.
640 * @work: work_struct of the function _setup_polling.
641 */
642static void _setup_polling(struct work_struct *work)
643{
644 unsigned long min = ULONG_MAX;
645 struct charger_manager *cm;
646 bool keep_polling = false;
647 unsigned long _next_polling;
648
649 mutex_lock(&cm_list_mtx);
650
651 list_for_each_entry(cm, &cm_list, entry) {
652 if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
653 keep_polling = true;
654
655 if (min > cm->desc->polling_interval_ms)
656 min = cm->desc->polling_interval_ms;
657 }
658 }
659
660 polling_jiffy = msecs_to_jiffies(min);
661 if (polling_jiffy <= CM_JIFFIES_SMALL)
662 polling_jiffy = CM_JIFFIES_SMALL + 1;
663
664 if (!keep_polling)
665 polling_jiffy = ULONG_MAX;
666 if (polling_jiffy == ULONG_MAX)
667 goto out;
668
669 WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
670 ". try it later. %s\n", __func__);
671
Tejun Heo2fbb5202012-12-21 17:56:51 -0800672 /*
673 * Use mod_delayed_work() iff the next polling interval should
674 * occur before the currently scheduled one. If @cm_monitor_work
675 * isn't active, the end result is the same, so no need to worry
676 * about stale @next_polling.
677 */
Chanwoo Choid829dc72012-05-05 06:24:10 -0700678 _next_polling = jiffies + polling_jiffy;
679
Tejun Heo2fbb5202012-12-21 17:56:51 -0800680 if (time_before(_next_polling, next_polling)) {
Tejun Heo41f63c52012-08-03 10:30:47 -0700681 mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
Tejun Heo2fbb5202012-12-21 17:56:51 -0800682 next_polling = _next_polling;
683 } else {
684 if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
685 next_polling = _next_polling;
Chanwoo Choid829dc72012-05-05 06:24:10 -0700686 }
Chanwoo Choid829dc72012-05-05 06:24:10 -0700687out:
688 mutex_unlock(&cm_list_mtx);
689}
690static DECLARE_WORK(setup_polling, _setup_polling);
691
692/**
693 * cm_monitor_poller - The Monitor / Poller.
694 * @work: work_struct of the function cm_monitor_poller
695 *
696 * During non-suspended state, cm_monitor_poller is used to poll and monitor
697 * the batteries.
698 */
699static void cm_monitor_poller(struct work_struct *work)
700{
701 cm_monitor();
702 schedule_work(&setup_polling);
703}
704
Chanwoo Choidfeccb12012-05-05 06:26:47 -0700705/**
706 * fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
707 * @cm: the Charger Manager representing the battery.
708 */
709static void fullbatt_handler(struct charger_manager *cm)
710{
711 struct charger_desc *desc = cm->desc;
712
713 if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
714 goto out;
715
716 if (cm_suspended)
717 device_set_wakeup_capable(cm->dev, true);
718
Tejun Heo41f63c52012-08-03 10:30:47 -0700719 mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
720 msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
Chanwoo Choidfeccb12012-05-05 06:26:47 -0700721 cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
722 desc->fullbatt_vchkdrop_ms);
723
724 if (cm->fullbatt_vchk_jiffies_at == 0)
725 cm->fullbatt_vchk_jiffies_at = 1;
726
727out:
728 dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged.\n");
729 uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
730}
731
732/**
733 * battout_handler - Event handler for CM_EVENT_BATT_OUT
734 * @cm: the Charger Manager representing the battery.
735 */
736static void battout_handler(struct charger_manager *cm)
737{
738 if (cm_suspended)
739 device_set_wakeup_capable(cm->dev, true);
740
741 if (!is_batt_present(cm)) {
742 dev_emerg(cm->dev, "Battery Pulled Out!\n");
743 uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
744 } else {
745 uevent_notify(cm, "Battery Reinserted?");
746 }
747}
748
749/**
750 * misc_event_handler - Handler for other evnets
751 * @cm: the Charger Manager representing the battery.
752 * @type: the Charger Manager representing the battery.
753 */
754static void misc_event_handler(struct charger_manager *cm,
755 enum cm_event_types type)
756{
757 if (cm_suspended)
758 device_set_wakeup_capable(cm->dev, true);
759
Tejun Heo2fbb5202012-12-21 17:56:51 -0800760 if (is_polling_required(cm) && cm->desc->polling_interval_ms)
Chanwoo Choidfeccb12012-05-05 06:26:47 -0700761 schedule_work(&setup_polling);
762 uevent_notify(cm, default_event_names[type]);
763}
764
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900765static int charger_get_property(struct power_supply *psy,
766 enum power_supply_property psp,
767 union power_supply_propval *val)
768{
769 struct charger_manager *cm = container_of(psy,
770 struct charger_manager, charger_psy);
771 struct charger_desc *desc = cm->desc;
Anton Vorontsovdf58c042012-03-15 21:01:28 +0400772 int ret = 0;
773 int uV;
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900774
775 switch (psp) {
776 case POWER_SUPPLY_PROP_STATUS:
777 if (is_charging(cm))
778 val->intval = POWER_SUPPLY_STATUS_CHARGING;
779 else if (is_ext_pwr_online(cm))
780 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
781 else
782 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
783 break;
784 case POWER_SUPPLY_PROP_HEALTH:
785 if (cm->emergency_stop > 0)
786 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
787 else if (cm->emergency_stop < 0)
788 val->intval = POWER_SUPPLY_HEALTH_COLD;
789 else
790 val->intval = POWER_SUPPLY_HEALTH_GOOD;
791 break;
792 case POWER_SUPPLY_PROP_PRESENT:
793 if (is_batt_present(cm))
794 val->intval = 1;
795 else
796 val->intval = 0;
797 break;
798 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
Anton Vorontsovdf58c042012-03-15 21:01:28 +0400799 ret = get_batt_uV(cm, &val->intval);
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900800 break;
801 case POWER_SUPPLY_PROP_CURRENT_NOW:
802 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
803 POWER_SUPPLY_PROP_CURRENT_NOW, val);
804 break;
805 case POWER_SUPPLY_PROP_TEMP:
806 /* in thenth of centigrade */
807 if (cm->last_temp_mC == INT_MIN)
808 desc->temperature_out_of_range(&cm->last_temp_mC);
809 val->intval = cm->last_temp_mC / 100;
810 if (!desc->measure_battery_temp)
811 ret = -ENODEV;
812 break;
813 case POWER_SUPPLY_PROP_TEMP_AMBIENT:
814 /* in thenth of centigrade */
815 if (cm->last_temp_mC == INT_MIN)
816 desc->temperature_out_of_range(&cm->last_temp_mC);
817 val->intval = cm->last_temp_mC / 100;
818 if (desc->measure_battery_temp)
819 ret = -ENODEV;
820 break;
821 case POWER_SUPPLY_PROP_CAPACITY:
822 if (!cm->fuel_gauge) {
823 ret = -ENODEV;
824 break;
825 }
826
827 if (!is_batt_present(cm)) {
828 /* There is no battery. Assume 100% */
829 val->intval = 100;
830 break;
831 }
832
833 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
834 POWER_SUPPLY_PROP_CAPACITY, val);
835 if (ret)
836 break;
837
838 if (val->intval > 100) {
839 val->intval = 100;
840 break;
841 }
842 if (val->intval < 0)
843 val->intval = 0;
844
845 /* Do not adjust SOC when charging: voltage is overrated */
846 if (is_charging(cm))
847 break;
848
849 /*
850 * If the capacity value is inconsistent, calibrate it base on
851 * the battery voltage values and the thresholds given as desc
852 */
853 ret = get_batt_uV(cm, &uV);
854 if (ret) {
855 /* Voltage information not available. No calibration */
856 ret = 0;
857 break;
858 }
859
860 if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
861 !is_charging(cm)) {
862 val->intval = 100;
863 break;
864 }
865
866 break;
867 case POWER_SUPPLY_PROP_ONLINE:
868 if (is_ext_pwr_online(cm))
869 val->intval = 1;
870 else
871 val->intval = 0;
872 break;
873 case POWER_SUPPLY_PROP_CHARGE_FULL:
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900874 if (is_full_charged(cm))
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900875 val->intval = 1;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +0900876 else
877 val->intval = 0;
Donggeun Kimad3d13ee2011-12-27 18:47:49 +0900878 ret = 0;
879 break;
880 case POWER_SUPPLY_PROP_CHARGE_NOW:
881 if (is_charging(cm)) {
882 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
883 POWER_SUPPLY_PROP_CHARGE_NOW,
884 val);
885 if (ret) {
886 val->intval = 1;
887 ret = 0;
888 } else {
889 /* If CHARGE_NOW is supplied, use it */
890 val->intval = (val->intval > 0) ?
891 val->intval : 1;
892 }
893 } else {
894 val->intval = 0;
895 }
896 break;
897 default:
898 return -EINVAL;
899 }
900 return ret;
901}
902
903#define NUM_CHARGER_PSY_OPTIONAL (4)
904static enum power_supply_property default_charger_props[] = {
905 /* Guaranteed to provide */
906 POWER_SUPPLY_PROP_STATUS,
907 POWER_SUPPLY_PROP_HEALTH,
908 POWER_SUPPLY_PROP_PRESENT,
909 POWER_SUPPLY_PROP_VOLTAGE_NOW,
910 POWER_SUPPLY_PROP_CAPACITY,
911 POWER_SUPPLY_PROP_ONLINE,
912 POWER_SUPPLY_PROP_CHARGE_FULL,
913 /*
914 * Optional properties are:
915 * POWER_SUPPLY_PROP_CHARGE_NOW,
916 * POWER_SUPPLY_PROP_CURRENT_NOW,
917 * POWER_SUPPLY_PROP_TEMP, and
918 * POWER_SUPPLY_PROP_TEMP_AMBIENT,
919 */
920};
921
922static struct power_supply psy_default = {
923 .name = "battery",
924 .type = POWER_SUPPLY_TYPE_BATTERY,
925 .properties = default_charger_props,
926 .num_properties = ARRAY_SIZE(default_charger_props),
927 .get_property = charger_get_property,
928};
929
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900930/**
931 * cm_setup_timer - For in-suspend monitoring setup wakeup alarm
932 * for suspend_again.
933 *
934 * Returns true if the alarm is set for Charger Manager to use.
935 * Returns false if
936 * cm_setup_timer fails to set an alarm,
937 * cm_setup_timer does not need to set an alarm for Charger Manager,
938 * or an alarm previously configured is to be used.
939 */
940static bool cm_setup_timer(void)
941{
942 struct charger_manager *cm;
943 unsigned int wakeup_ms = UINT_MAX;
944 bool ret = false;
945
946 mutex_lock(&cm_list_mtx);
947
948 list_for_each_entry(cm, &cm_list, entry) {
Chanwoo Choid829dc72012-05-05 06:24:10 -0700949 unsigned int fbchk_ms = 0;
950
951 /* fullbatt_vchk is required. setup timer for that */
952 if (cm->fullbatt_vchk_jiffies_at) {
953 fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
954 - jiffies);
955 if (time_is_before_eq_jiffies(
956 cm->fullbatt_vchk_jiffies_at) ||
957 msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
958 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
959 fbchk_ms = 0;
960 }
961 }
962 CM_MIN_VALID(wakeup_ms, fbchk_ms);
963
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +0900964 /* Skip if polling is not required for this CM */
965 if (!is_polling_required(cm) && !cm->emergency_stop)
966 continue;
967 if (cm->desc->polling_interval_ms == 0)
968 continue;
969 CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
970 }
971
972 mutex_unlock(&cm_list_mtx);
973
974 if (wakeup_ms < UINT_MAX && wakeup_ms > 0) {
975 pr_info("Charger Manager wakeup timer: %u ms.\n", wakeup_ms);
976 if (rtc_dev) {
977 struct rtc_wkalrm tmp;
978 unsigned long time, now;
979 unsigned long add = DIV_ROUND_UP(wakeup_ms, 1000);
980
981 /*
982 * Set alarm with the polling interval (wakeup_ms)
983 * except when rtc_wkalarm_save comes first.
984 * However, the alarm time should be NOW +
985 * CM_RTC_SMALL or later.
986 */
987 tmp.enabled = 1;
988 rtc_read_time(rtc_dev, &tmp.time);
989 rtc_tm_to_time(&tmp.time, &now);
990 if (add < CM_RTC_SMALL)
991 add = CM_RTC_SMALL;
992 time = now + add;
993
994 ret = true;
995
996 if (rtc_wkalarm_save.enabled &&
997 rtc_wkalarm_save_time &&
998 rtc_wkalarm_save_time < time) {
999 if (rtc_wkalarm_save_time < now + CM_RTC_SMALL)
1000 time = now + CM_RTC_SMALL;
1001 else
1002 time = rtc_wkalarm_save_time;
1003
1004 /* The timer is not appointed by CM */
1005 ret = false;
1006 }
1007
1008 pr_info("Waking up after %lu secs.\n",
1009 time - now);
1010
1011 rtc_time_to_tm(time, &tmp.time);
1012 rtc_set_alarm(rtc_dev, &tmp);
1013 cm_suspend_duration_ms += wakeup_ms;
1014 return ret;
1015 }
1016 }
1017
1018 if (rtc_dev)
1019 rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
1020 return false;
1021}
1022
Chanwoo Choid829dc72012-05-05 06:24:10 -07001023static void _cm_fbchk_in_suspend(struct charger_manager *cm)
1024{
1025 unsigned long jiffy_now = jiffies;
1026
1027 if (!cm->fullbatt_vchk_jiffies_at)
1028 return;
1029
1030 if (g_desc && g_desc->assume_timer_stops_in_suspend)
1031 jiffy_now += msecs_to_jiffies(cm_suspend_duration_ms);
1032
1033 /* Execute now if it's going to be executed not too long after */
1034 jiffy_now += CM_JIFFIES_SMALL;
1035
1036 if (time_after_eq(jiffy_now, cm->fullbatt_vchk_jiffies_at))
1037 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
1038}
1039
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001040/**
1041 * cm_suspend_again - Determine whether suspend again or not
1042 *
1043 * Returns true if the system should be suspended again
1044 * Returns false if the system should be woken up
1045 */
1046bool cm_suspend_again(void)
1047{
1048 struct charger_manager *cm;
1049 bool ret = false;
1050
1051 if (!g_desc || !g_desc->rtc_only_wakeup || !g_desc->rtc_only_wakeup() ||
1052 !cm_rtc_set)
1053 return false;
1054
1055 if (cm_monitor())
1056 goto out;
1057
1058 ret = true;
1059 mutex_lock(&cm_list_mtx);
1060 list_for_each_entry(cm, &cm_list, entry) {
Chanwoo Choid829dc72012-05-05 06:24:10 -07001061 _cm_fbchk_in_suspend(cm);
1062
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001063 if (cm->status_save_ext_pwr_inserted != is_ext_pwr_online(cm) ||
Axel Linbb2a95c2012-01-12 12:56:35 +08001064 cm->status_save_batt != is_batt_present(cm)) {
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001065 ret = false;
Axel Linbb2a95c2012-01-12 12:56:35 +08001066 break;
1067 }
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001068 }
1069 mutex_unlock(&cm_list_mtx);
1070
1071 cm_rtc_set = cm_setup_timer();
1072out:
1073 /* It's about the time when the non-CM appointed timer goes off */
1074 if (rtc_wkalarm_save.enabled) {
1075 unsigned long now;
1076 struct rtc_time tmp;
1077
1078 rtc_read_time(rtc_dev, &tmp);
1079 rtc_tm_to_time(&tmp, &now);
1080
1081 if (rtc_wkalarm_save_time &&
1082 now + CM_RTC_SMALL >= rtc_wkalarm_save_time)
1083 return false;
1084 }
1085 return ret;
1086}
1087EXPORT_SYMBOL_GPL(cm_suspend_again);
1088
1089/**
1090 * setup_charger_manager - initialize charger_global_desc data
1091 * @gd: pointer to instance of charger_global_desc
1092 */
1093int setup_charger_manager(struct charger_global_desc *gd)
1094{
1095 if (!gd)
1096 return -EINVAL;
1097
1098 if (rtc_dev)
1099 rtc_class_close(rtc_dev);
1100 rtc_dev = NULL;
1101 g_desc = NULL;
1102
1103 if (!gd->rtc_only_wakeup) {
1104 pr_err("The callback rtc_only_wakeup is not given.\n");
1105 return -EINVAL;
1106 }
1107
1108 if (gd->rtc_name) {
1109 rtc_dev = rtc_class_open(gd->rtc_name);
1110 if (IS_ERR_OR_NULL(rtc_dev)) {
1111 rtc_dev = NULL;
1112 /* Retry at probe. RTC may be not registered yet */
1113 }
1114 } else {
1115 pr_warn("No wakeup timer is given for charger manager."
1116 "In-suspend monitoring won't work.\n");
1117 }
1118
1119 g_desc = gd;
1120 return 0;
1121}
1122EXPORT_SYMBOL_GPL(setup_charger_manager);
1123
Chanwoo Choibee737b2012-07-12 15:03:25 +09001124/**
1125 * charger_extcon_work - enable/diable charger according to the state
1126 * of charger cable
1127 *
1128 * @work: work_struct of the function charger_extcon_work.
1129 */
1130static void charger_extcon_work(struct work_struct *work)
1131{
1132 struct charger_cable *cable =
1133 container_of(work, struct charger_cable, wq);
Chanwoo Choi45cd4fb2012-07-12 15:03:29 +09001134 int ret;
1135
1136 if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
1137 ret = regulator_set_current_limit(cable->charger->consumer,
1138 cable->min_uA, cable->max_uA);
1139 if (ret < 0) {
1140 pr_err("Cannot set current limit of %s (%s)\n",
1141 cable->charger->regulator_name, cable->name);
1142 return;
1143 }
1144
1145 pr_info("Set current limit of %s : %duA ~ %duA\n",
1146 cable->charger->regulator_name,
1147 cable->min_uA, cable->max_uA);
1148 }
Chanwoo Choibee737b2012-07-12 15:03:25 +09001149
1150 try_charger_enable(cable->cm, cable->attached);
1151}
1152
1153/**
1154 * charger_extcon_notifier - receive the state of charger cable
1155 * when registered cable is attached or detached.
1156 *
1157 * @self: the notifier block of the charger_extcon_notifier.
1158 * @event: the cable state.
1159 * @ptr: the data pointer of notifier block.
1160 */
1161static int charger_extcon_notifier(struct notifier_block *self,
1162 unsigned long event, void *ptr)
1163{
1164 struct charger_cable *cable =
1165 container_of(self, struct charger_cable, nb);
1166
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +09001167 /*
1168 * The newly state of charger cable.
1169 * If cable is attached, cable->attached is true.
1170 */
Chanwoo Choibee737b2012-07-12 15:03:25 +09001171 cable->attached = event;
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +09001172
1173 /*
1174 * Setup monitoring to check battery state
1175 * when charger cable is attached.
1176 */
1177 if (cable->attached && is_polling_required(cable->cm)) {
Tejun Heo2fbb5202012-12-21 17:56:51 -08001178 cancel_work_sync(&setup_polling);
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +09001179 schedule_work(&setup_polling);
1180 }
1181
1182 /*
1183 * Setup work for controlling charger(regulator)
1184 * according to charger cable.
1185 */
Chanwoo Choibee737b2012-07-12 15:03:25 +09001186 schedule_work(&cable->wq);
1187
1188 return NOTIFY_DONE;
1189}
1190
1191/**
1192 * charger_extcon_init - register external connector to use it
1193 * as the charger cable
1194 *
1195 * @cm: the Charger Manager representing the battery.
1196 * @cable: the Charger cable representing the external connector.
1197 */
1198static int charger_extcon_init(struct charger_manager *cm,
1199 struct charger_cable *cable)
1200{
1201 int ret = 0;
1202
1203 /*
1204 * Charger manager use Extcon framework to identify
1205 * the charger cable among various external connector
1206 * cable (e.g., TA, USB, MHL, Dock).
1207 */
1208 INIT_WORK(&cable->wq, charger_extcon_work);
1209 cable->nb.notifier_call = charger_extcon_notifier;
1210 ret = extcon_register_interest(&cable->extcon_dev,
1211 cable->extcon_name, cable->name, &cable->nb);
1212 if (ret < 0) {
1213 pr_info("Cannot register extcon_dev for %s(cable: %s).\n",
1214 cable->extcon_name,
1215 cable->name);
1216 ret = -EINVAL;
1217 }
1218
1219 return ret;
1220}
1221
Chanwoo Choi41468a12012-11-22 16:54:26 +09001222/**
1223 * charger_manager_register_extcon - Register extcon device to recevie state
1224 * of charger cable.
1225 * @cm: the Charger Manager representing the battery.
1226 *
1227 * This function support EXTCON(External Connector) subsystem to detect the
1228 * state of charger cables for enabling or disabling charger(regulator) and
1229 * select the charger cable for charging among a number of external cable
1230 * according to policy of H/W board.
1231 */
1232static int charger_manager_register_extcon(struct charger_manager *cm)
1233{
1234 struct charger_desc *desc = cm->desc;
1235 struct charger_regulator *charger;
1236 int ret = 0;
1237 int i;
1238 int j;
1239
1240 for (i = 0; i < desc->num_charger_regulators; i++) {
1241 charger = &desc->charger_regulators[i];
1242
1243 charger->consumer = regulator_get(cm->dev,
1244 charger->regulator_name);
1245 if (charger->consumer == NULL) {
1246 dev_err(cm->dev, "Cannot find charger(%s)n",
1247 charger->regulator_name);
1248 ret = -EINVAL;
1249 goto err;
1250 }
1251 charger->cm = cm;
1252
1253 for (j = 0; j < charger->num_cables; j++) {
1254 struct charger_cable *cable = &charger->cables[j];
1255
1256 ret = charger_extcon_init(cm, cable);
1257 if (ret < 0) {
1258 dev_err(cm->dev, "Cannot initialize charger(%s)n",
1259 charger->regulator_name);
1260 goto err;
1261 }
1262 cable->charger = charger;
1263 cable->cm = cm;
1264 }
1265 }
1266
1267err:
1268 return ret;
1269}
1270
Chanwoo Choi3950c782012-09-21 18:49:37 +09001271/* help function of sysfs node to control charger(regulator) */
1272static ssize_t charger_name_show(struct device *dev,
1273 struct device_attribute *attr, char *buf)
1274{
1275 struct charger_regulator *charger
1276 = container_of(attr, struct charger_regulator, attr_name);
1277
1278 return sprintf(buf, "%s\n", charger->regulator_name);
1279}
1280
1281static ssize_t charger_state_show(struct device *dev,
1282 struct device_attribute *attr, char *buf)
1283{
1284 struct charger_regulator *charger
1285 = container_of(attr, struct charger_regulator, attr_state);
1286 int state = 0;
1287
1288 if (!charger->externally_control)
1289 state = regulator_is_enabled(charger->consumer);
1290
1291 return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
1292}
1293
1294static ssize_t charger_externally_control_show(struct device *dev,
1295 struct device_attribute *attr, char *buf)
1296{
1297 struct charger_regulator *charger = container_of(attr,
1298 struct charger_regulator, attr_externally_control);
1299
1300 return sprintf(buf, "%d\n", charger->externally_control);
1301}
1302
1303static ssize_t charger_externally_control_store(struct device *dev,
1304 struct device_attribute *attr, const char *buf,
1305 size_t count)
1306{
1307 struct charger_regulator *charger
1308 = container_of(attr, struct charger_regulator,
1309 attr_externally_control);
1310 struct charger_manager *cm = charger->cm;
1311 struct charger_desc *desc = cm->desc;
1312 int i;
1313 int ret;
1314 int externally_control;
1315 int chargers_externally_control = 1;
1316
1317 ret = sscanf(buf, "%d", &externally_control);
1318 if (ret == 0) {
1319 ret = -EINVAL;
1320 return ret;
1321 }
1322
1323 if (!externally_control) {
1324 charger->externally_control = 0;
1325 return count;
1326 }
1327
1328 for (i = 0; i < desc->num_charger_regulators; i++) {
1329 if (&desc->charger_regulators[i] != charger &&
Chanwoo Choi41468a12012-11-22 16:54:26 +09001330 !desc->charger_regulators[i].externally_control) {
Chanwoo Choi3950c782012-09-21 18:49:37 +09001331 /*
1332 * At least, one charger is controlled by
1333 * charger-manager
1334 */
1335 chargers_externally_control = 0;
1336 break;
1337 }
1338 }
1339
1340 if (!chargers_externally_control) {
1341 if (cm->charger_enabled) {
1342 try_charger_enable(charger->cm, false);
1343 charger->externally_control = externally_control;
1344 try_charger_enable(charger->cm, true);
1345 } else {
1346 charger->externally_control = externally_control;
1347 }
1348 } else {
1349 dev_warn(cm->dev,
1350 "'%s' regulator should be controlled "
1351 "in charger-manager because charger-manager "
1352 "must need at least one charger for charging\n",
1353 charger->regulator_name);
1354 }
1355
1356 return count;
1357}
1358
Chanwoo Choi41468a12012-11-22 16:54:26 +09001359/**
1360 * charger_manager_register_sysfs - Register sysfs entry for each charger
1361 * @cm: the Charger Manager representing the battery.
1362 *
1363 * This function add sysfs entry for charger(regulator) to control charger from
1364 * user-space. If some development board use one more chargers for charging
1365 * but only need one charger on specific case which is dependent on user
1366 * scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
1367 * class/power_supply/battery/charger.[index]/externally_control'. For example,
1368 * if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
1369 * externally_control, this charger isn't controlled from charger-manager and
1370 * always stay off state of regulator.
1371 */
1372static int charger_manager_register_sysfs(struct charger_manager *cm)
1373{
1374 struct charger_desc *desc = cm->desc;
1375 struct charger_regulator *charger;
1376 int chargers_externally_control = 1;
1377 char buf[11];
1378 char *str;
1379 int ret = 0;
1380 int i;
1381
1382 /* Create sysfs entry to control charger(regulator) */
1383 for (i = 0; i < desc->num_charger_regulators; i++) {
1384 charger = &desc->charger_regulators[i];
1385
1386 snprintf(buf, 10, "charger.%d", i);
1387 str = kzalloc(sizeof(char) * (strlen(buf) + 1), GFP_KERNEL);
1388 if (!str) {
1389 dev_err(cm->dev, "Cannot allocate memory: %s\n",
1390 charger->regulator_name);
1391 ret = -ENOMEM;
1392 goto err;
1393 }
1394 strcpy(str, buf);
1395
1396 charger->attrs[0] = &charger->attr_name.attr;
1397 charger->attrs[1] = &charger->attr_state.attr;
1398 charger->attrs[2] = &charger->attr_externally_control.attr;
1399 charger->attrs[3] = NULL;
1400 charger->attr_g.name = str;
1401 charger->attr_g.attrs = charger->attrs;
1402
1403 sysfs_attr_init(&charger->attr_name.attr);
1404 charger->attr_name.attr.name = "name";
1405 charger->attr_name.attr.mode = 0444;
1406 charger->attr_name.show = charger_name_show;
1407
1408 sysfs_attr_init(&charger->attr_state.attr);
1409 charger->attr_state.attr.name = "state";
1410 charger->attr_state.attr.mode = 0444;
1411 charger->attr_state.show = charger_state_show;
1412
1413 sysfs_attr_init(&charger->attr_externally_control.attr);
1414 charger->attr_externally_control.attr.name
1415 = "externally_control";
1416 charger->attr_externally_control.attr.mode = 0644;
1417 charger->attr_externally_control.show
1418 = charger_externally_control_show;
1419 charger->attr_externally_control.store
1420 = charger_externally_control_store;
1421
1422 if (!desc->charger_regulators[i].externally_control ||
1423 !chargers_externally_control)
1424 chargers_externally_control = 0;
1425
1426 dev_info(cm->dev, "'%s' regulator's externally_control"
1427 "is %d\n", charger->regulator_name,
1428 charger->externally_control);
1429
1430 ret = sysfs_create_group(&cm->charger_psy.dev->kobj,
1431 &charger->attr_g);
1432 if (ret < 0) {
1433 dev_err(cm->dev, "Cannot create sysfs entry"
1434 "of %s regulator\n",
1435 charger->regulator_name);
1436 ret = -EINVAL;
1437 goto err;
1438 }
1439 }
1440
1441 if (chargers_externally_control) {
1442 dev_err(cm->dev, "Cannot register regulator because "
1443 "charger-manager must need at least "
1444 "one charger for charging battery\n");
1445
1446 ret = -EINVAL;
1447 goto err;
1448 }
1449
1450err:
1451 return ret;
1452}
1453
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001454static int charger_manager_probe(struct platform_device *pdev)
1455{
1456 struct charger_desc *desc = dev_get_platdata(&pdev->dev);
1457 struct charger_manager *cm;
1458 int ret = 0, i = 0;
Chanwoo Choibee737b2012-07-12 15:03:25 +09001459 int j = 0;
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001460 union power_supply_propval val;
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001461
1462 if (g_desc && !rtc_dev && g_desc->rtc_name) {
1463 rtc_dev = rtc_class_open(g_desc->rtc_name);
1464 if (IS_ERR_OR_NULL(rtc_dev)) {
1465 rtc_dev = NULL;
1466 dev_err(&pdev->dev, "Cannot get RTC %s.\n",
1467 g_desc->rtc_name);
1468 ret = -ENODEV;
1469 goto err_alloc;
1470 }
1471 }
1472
1473 if (!desc) {
1474 dev_err(&pdev->dev, "No platform data (desc) found.\n");
1475 ret = -ENODEV;
1476 goto err_alloc;
1477 }
1478
1479 cm = kzalloc(sizeof(struct charger_manager), GFP_KERNEL);
1480 if (!cm) {
1481 dev_err(&pdev->dev, "Cannot allocate memory.\n");
1482 ret = -ENOMEM;
1483 goto err_alloc;
1484 }
1485
1486 /* Basic Values. Unspecified are Null or 0 */
1487 cm->dev = &pdev->dev;
1488 cm->desc = kzalloc(sizeof(struct charger_desc), GFP_KERNEL);
1489 if (!cm->desc) {
1490 dev_err(&pdev->dev, "Cannot allocate memory.\n");
1491 ret = -ENOMEM;
1492 goto err_alloc_desc;
1493 }
1494 memcpy(cm->desc, desc, sizeof(struct charger_desc));
1495 cm->last_temp_mC = INT_MIN; /* denotes "unmeasured, yet" */
1496
Chanwoo Choid829dc72012-05-05 06:24:10 -07001497 /*
1498 * The following two do not need to be errors.
1499 * Users may intentionally ignore those two features.
1500 */
1501 if (desc->fullbatt_uV == 0) {
1502 dev_info(&pdev->dev, "Ignoring full-battery voltage threshold"
1503 " as it is not supplied.");
1504 }
1505 if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
1506 dev_info(&pdev->dev, "Disabling full-battery voltage drop "
1507 "checking mechanism as it is not supplied.");
1508 desc->fullbatt_vchkdrop_ms = 0;
1509 desc->fullbatt_vchkdrop_uV = 0;
1510 }
Chanwoo Choi2ed9e9b2012-08-21 17:06:52 +09001511 if (desc->fullbatt_soc == 0) {
1512 dev_info(&pdev->dev, "Ignoring full-battery soc(state of"
1513 " charge) threshold as it is not"
1514 " supplied.");
1515 }
1516 if (desc->fullbatt_full_capacity == 0) {
1517 dev_info(&pdev->dev, "Ignoring full-battery full capacity"
1518 " threshold as it is not supplied.");
1519 }
Chanwoo Choid829dc72012-05-05 06:24:10 -07001520
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001521 if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1522 ret = -EINVAL;
1523 dev_err(&pdev->dev, "charger_regulators undefined.\n");
1524 goto err_no_charger;
1525 }
1526
1527 if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1528 dev_err(&pdev->dev, "No power supply defined.\n");
1529 ret = -EINVAL;
1530 goto err_no_charger_stat;
1531 }
1532
1533 /* Counting index only */
1534 while (desc->psy_charger_stat[i])
1535 i++;
1536
1537 cm->charger_stat = kzalloc(sizeof(struct power_supply *) * (i + 1),
1538 GFP_KERNEL);
1539 if (!cm->charger_stat) {
1540 ret = -ENOMEM;
1541 goto err_no_charger_stat;
1542 }
1543
1544 for (i = 0; desc->psy_charger_stat[i]; i++) {
1545 cm->charger_stat[i] = power_supply_get_by_name(
1546 desc->psy_charger_stat[i]);
1547 if (!cm->charger_stat[i]) {
1548 dev_err(&pdev->dev, "Cannot find power supply "
1549 "\"%s\"\n",
1550 desc->psy_charger_stat[i]);
1551 ret = -ENODEV;
1552 goto err_chg_stat;
1553 }
1554 }
1555
1556 cm->fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
1557 if (!cm->fuel_gauge) {
1558 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1559 desc->psy_fuel_gauge);
1560 ret = -ENODEV;
1561 goto err_chg_stat;
1562 }
1563
1564 if (desc->polling_interval_ms == 0 ||
1565 msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL) {
1566 dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1567 ret = -EINVAL;
1568 goto err_chg_stat;
1569 }
1570
1571 if (!desc->temperature_out_of_range) {
1572 dev_err(&pdev->dev, "there is no temperature_out_of_range\n");
1573 ret = -EINVAL;
1574 goto err_chg_stat;
1575 }
1576
Chanwoo Choi8fcfe082012-09-20 21:20:05 -07001577 if (!desc->charging_max_duration_ms ||
1578 !desc->discharging_max_duration_ms) {
1579 dev_info(&pdev->dev, "Cannot limit charging duration "
1580 "checking mechanism to prevent overcharge/overheat "
1581 "and control discharging duration");
1582 desc->charging_max_duration_ms = 0;
1583 desc->discharging_max_duration_ms = 0;
1584 }
1585
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001586 platform_set_drvdata(pdev, cm);
1587
Axel Linbb2a95c2012-01-12 12:56:35 +08001588 memcpy(&cm->charger_psy, &psy_default, sizeof(psy_default));
1589
Chanwoo Choi41468a12012-11-22 16:54:26 +09001590 if (!desc->psy_name)
Axel Linbb2a95c2012-01-12 12:56:35 +08001591 strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
Chanwoo Choi41468a12012-11-22 16:54:26 +09001592 else
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001593 strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001594 cm->charger_psy.name = cm->psy_name_buf;
1595
1596 /* Allocate for psy properties because they may vary */
1597 cm->charger_psy.properties = kzalloc(sizeof(enum power_supply_property)
1598 * (ARRAY_SIZE(default_charger_props) +
1599 NUM_CHARGER_PSY_OPTIONAL),
1600 GFP_KERNEL);
1601 if (!cm->charger_psy.properties) {
1602 dev_err(&pdev->dev, "Cannot allocate for psy properties.\n");
1603 ret = -ENOMEM;
1604 goto err_chg_stat;
1605 }
1606 memcpy(cm->charger_psy.properties, default_charger_props,
1607 sizeof(enum power_supply_property) *
1608 ARRAY_SIZE(default_charger_props));
1609 cm->charger_psy.num_properties = psy_default.num_properties;
1610
1611 /* Find which optional psy-properties are available */
1612 if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
1613 POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
1614 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1615 POWER_SUPPLY_PROP_CHARGE_NOW;
1616 cm->charger_psy.num_properties++;
1617 }
1618 if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
1619 POWER_SUPPLY_PROP_CURRENT_NOW,
1620 &val)) {
1621 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1622 POWER_SUPPLY_PROP_CURRENT_NOW;
1623 cm->charger_psy.num_properties++;
1624 }
Axel Linbb2a95c2012-01-12 12:56:35 +08001625
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001626 if (desc->measure_battery_temp) {
1627 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1628 POWER_SUPPLY_PROP_TEMP;
1629 cm->charger_psy.num_properties++;
Axel Linbb2a95c2012-01-12 12:56:35 +08001630 } else {
1631 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1632 POWER_SUPPLY_PROP_TEMP_AMBIENT;
1633 cm->charger_psy.num_properties++;
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001634 }
1635
Chanwoo Choid829dc72012-05-05 06:24:10 -07001636 INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
1637
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001638 ret = power_supply_register(NULL, &cm->charger_psy);
1639 if (ret) {
1640 dev_err(&pdev->dev, "Cannot register charger-manager with"
1641 " name \"%s\".\n", cm->charger_psy.name);
1642 goto err_register;
1643 }
1644
Chanwoo Choi41468a12012-11-22 16:54:26 +09001645 /* Register extcon device for charger cable */
1646 ret = charger_manager_register_extcon(cm);
1647 if (ret < 0) {
1648 dev_err(&pdev->dev, "Cannot initialize extcon device\n");
1649 goto err_reg_extcon;
Chanwoo Choi3950c782012-09-21 18:49:37 +09001650 }
1651
Chanwoo Choi41468a12012-11-22 16:54:26 +09001652 /* Register sysfs entry for charger(regulator) */
1653 ret = charger_manager_register_sysfs(cm);
1654 if (ret < 0) {
1655 dev_err(&pdev->dev,
1656 "Cannot initialize sysfs entry of regulator\n");
1657 goto err_reg_sysfs;
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001658 }
1659
1660 /* Add to the list */
1661 mutex_lock(&cm_list_mtx);
1662 list_add(&cm->entry, &cm_list);
1663 mutex_unlock(&cm_list_mtx);
1664
Chanwoo Choidfeccb12012-05-05 06:26:47 -07001665 /*
1666 * Charger-manager is capable of waking up the systme from sleep
1667 * when event is happend through cm_notify_event()
1668 */
1669 device_init_wakeup(&pdev->dev, true);
1670 device_set_wakeup_capable(&pdev->dev, false);
1671
Chanwoo Choid829dc72012-05-05 06:24:10 -07001672 schedule_work(&setup_polling);
1673
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001674 return 0;
1675
Chanwoo Choi41468a12012-11-22 16:54:26 +09001676err_reg_sysfs:
Chanwoo Choi3950c782012-09-21 18:49:37 +09001677 for (i = 0; i < desc->num_charger_regulators; i++) {
1678 struct charger_regulator *charger;
1679
1680 charger = &desc->charger_regulators[i];
1681 sysfs_remove_group(&cm->charger_psy.dev->kobj,
1682 &charger->attr_g);
Chanwoo Choi41468a12012-11-22 16:54:26 +09001683
Chanwoo Choi3950c782012-09-21 18:49:37 +09001684 kfree(charger->attr_g.name);
1685 }
Chanwoo Choi41468a12012-11-22 16:54:26 +09001686err_reg_extcon:
1687 for (i = 0; i < desc->num_charger_regulators; i++) {
1688 struct charger_regulator *charger;
1689
1690 charger = &desc->charger_regulators[i];
1691 for (j = 0; j < charger->num_cables; j++) {
Chanwoo Choibee737b2012-07-12 15:03:25 +09001692 struct charger_cable *cable = &charger->cables[j];
1693 extcon_unregister_interest(&cable->extcon_dev);
1694 }
Chanwoo Choi41468a12012-11-22 16:54:26 +09001695
Chanwoo Choibee737b2012-07-12 15:03:25 +09001696 regulator_put(desc->charger_regulators[i].consumer);
Chanwoo Choi41468a12012-11-22 16:54:26 +09001697 }
Chanwoo Choibee737b2012-07-12 15:03:25 +09001698
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001699 power_supply_unregister(&cm->charger_psy);
1700err_register:
1701 kfree(cm->charger_psy.properties);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001702err_chg_stat:
1703 kfree(cm->charger_stat);
1704err_no_charger_stat:
1705err_no_charger:
1706 kfree(cm->desc);
1707err_alloc_desc:
1708 kfree(cm);
1709err_alloc:
1710 return ret;
1711}
1712
Bill Pemberton415ec692012-11-19 13:26:07 -05001713static int charger_manager_remove(struct platform_device *pdev)
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001714{
1715 struct charger_manager *cm = platform_get_drvdata(pdev);
1716 struct charger_desc *desc = cm->desc;
Chanwoo Choibee737b2012-07-12 15:03:25 +09001717 int i = 0;
1718 int j = 0;
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001719
1720 /* Remove from the list */
1721 mutex_lock(&cm_list_mtx);
1722 list_del(&cm->entry);
1723 mutex_unlock(&cm_list_mtx);
1724
Tejun Heo2fbb5202012-12-21 17:56:51 -08001725 cancel_work_sync(&setup_polling);
1726 cancel_delayed_work_sync(&cm_monitor_work);
Chanwoo Choid829dc72012-05-05 06:24:10 -07001727
Chanwoo Choibee737b2012-07-12 15:03:25 +09001728 for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1729 struct charger_regulator *charger
1730 = &desc->charger_regulators[i];
1731 for (j = 0 ; j < charger->num_cables ; j++) {
1732 struct charger_cable *cable = &charger->cables[j];
1733 extcon_unregister_interest(&cable->extcon_dev);
1734 }
1735 }
1736
1737 for (i = 0 ; i < desc->num_charger_regulators ; i++)
1738 regulator_put(desc->charger_regulators[i].consumer);
1739
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001740 power_supply_unregister(&cm->charger_psy);
Chanwoo Choid829dc72012-05-05 06:24:10 -07001741
1742 try_charger_enable(cm, false);
1743
Donggeun Kimad3d13ee2011-12-27 18:47:49 +09001744 kfree(cm->charger_psy.properties);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001745 kfree(cm->charger_stat);
1746 kfree(cm->desc);
1747 kfree(cm);
1748
1749 return 0;
1750}
1751
Axel Lin1bbe24d2012-01-11 17:19:45 +08001752static const struct platform_device_id charger_manager_id[] = {
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001753 { "charger-manager", 0 },
1754 { },
1755};
Axel Lin1bbe24d2012-01-11 17:19:45 +08001756MODULE_DEVICE_TABLE(platform, charger_manager_id);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001757
Chanwoo Choidfeccb12012-05-05 06:26:47 -07001758static int cm_suspend_noirq(struct device *dev)
1759{
1760 int ret = 0;
1761
1762 if (device_may_wakeup(dev)) {
1763 device_set_wakeup_capable(dev, false);
1764 ret = -EAGAIN;
1765 }
1766
1767 return ret;
1768}
1769
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001770static int cm_suspend_prepare(struct device *dev)
1771{
Axel Linbb2a95c2012-01-12 12:56:35 +08001772 struct charger_manager *cm = dev_get_drvdata(dev);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001773
1774 if (!cm_suspended) {
1775 if (rtc_dev) {
1776 struct rtc_time tmp;
1777 unsigned long now;
1778
1779 rtc_read_alarm(rtc_dev, &rtc_wkalarm_save);
1780 rtc_read_time(rtc_dev, &tmp);
1781
1782 if (rtc_wkalarm_save.enabled) {
1783 rtc_tm_to_time(&rtc_wkalarm_save.time,
1784 &rtc_wkalarm_save_time);
1785 rtc_tm_to_time(&tmp, &now);
1786 if (now > rtc_wkalarm_save_time)
1787 rtc_wkalarm_save_time = 0;
1788 } else {
1789 rtc_wkalarm_save_time = 0;
1790 }
1791 }
1792 cm_suspended = true;
1793 }
1794
Tejun Heo2fbb5202012-12-21 17:56:51 -08001795 cancel_delayed_work(&cm->fullbatt_vchk_work);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001796 cm->status_save_ext_pwr_inserted = is_ext_pwr_online(cm);
1797 cm->status_save_batt = is_batt_present(cm);
1798
1799 if (!cm_rtc_set) {
1800 cm_suspend_duration_ms = 0;
1801 cm_rtc_set = cm_setup_timer();
1802 }
1803
1804 return 0;
1805}
1806
1807static void cm_suspend_complete(struct device *dev)
1808{
Axel Linbb2a95c2012-01-12 12:56:35 +08001809 struct charger_manager *cm = dev_get_drvdata(dev);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001810
1811 if (cm_suspended) {
1812 if (rtc_dev) {
1813 struct rtc_wkalrm tmp;
1814
1815 rtc_read_alarm(rtc_dev, &tmp);
1816 rtc_wkalarm_save.pending = tmp.pending;
1817 rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
1818 }
1819 cm_suspended = false;
1820 cm_rtc_set = false;
1821 }
1822
Chanwoo Choid829dc72012-05-05 06:24:10 -07001823 /* Re-enqueue delayed work (fullbatt_vchk_work) */
1824 if (cm->fullbatt_vchk_jiffies_at) {
1825 unsigned long delay = 0;
1826 unsigned long now = jiffies + CM_JIFFIES_SMALL;
1827
1828 if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
1829 delay = (unsigned long)((long)now
1830 - (long)(cm->fullbatt_vchk_jiffies_at));
1831 delay = jiffies_to_msecs(delay);
1832 } else {
1833 delay = 0;
1834 }
1835
1836 /*
1837 * Account for cm_suspend_duration_ms if
1838 * assume_timer_stops_in_suspend is active
1839 */
1840 if (g_desc && g_desc->assume_timer_stops_in_suspend) {
1841 if (delay > cm_suspend_duration_ms)
1842 delay -= cm_suspend_duration_ms;
1843 else
1844 delay = 0;
1845 }
1846
1847 queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
1848 msecs_to_jiffies(delay));
1849 }
Chanwoo Choidfeccb12012-05-05 06:26:47 -07001850 device_set_wakeup_capable(cm->dev, false);
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001851 uevent_notify(cm, NULL);
1852}
1853
1854static const struct dev_pm_ops charger_manager_pm = {
1855 .prepare = cm_suspend_prepare,
Chanwoo Choidfeccb12012-05-05 06:26:47 -07001856 .suspend_noirq = cm_suspend_noirq,
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001857 .complete = cm_suspend_complete,
1858};
1859
1860static struct platform_driver charger_manager_driver = {
1861 .driver = {
1862 .name = "charger-manager",
1863 .owner = THIS_MODULE,
1864 .pm = &charger_manager_pm,
1865 },
1866 .probe = charger_manager_probe,
Bill Pemberton28ea73f2012-11-19 13:20:40 -05001867 .remove = charger_manager_remove,
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001868 .id_table = charger_manager_id,
1869};
1870
1871static int __init charger_manager_init(void)
1872{
Chanwoo Choid829dc72012-05-05 06:24:10 -07001873 cm_wq = create_freezable_workqueue("charger_manager");
1874 INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
1875
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001876 return platform_driver_register(&charger_manager_driver);
1877}
1878late_initcall(charger_manager_init);
1879
1880static void __exit charger_manager_cleanup(void)
1881{
Chanwoo Choid829dc72012-05-05 06:24:10 -07001882 destroy_workqueue(cm_wq);
1883 cm_wq = NULL;
1884
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001885 platform_driver_unregister(&charger_manager_driver);
1886}
1887module_exit(charger_manager_cleanup);
1888
Chanwoo Choidfeccb12012-05-05 06:26:47 -07001889/**
1890 * find_power_supply - find the associated power_supply of charger
1891 * @cm: the Charger Manager representing the battery
1892 * @psy: pointer to instance of charger's power_supply
1893 */
1894static bool find_power_supply(struct charger_manager *cm,
1895 struct power_supply *psy)
1896{
1897 int i;
1898 bool found = false;
1899
1900 for (i = 0; cm->charger_stat[i]; i++) {
1901 if (psy == cm->charger_stat[i]) {
1902 found = true;
1903 break;
1904 }
1905 }
1906
1907 return found;
1908}
1909
1910/**
1911 * cm_notify_event - charger driver notify Charger Manager of charger event
1912 * @psy: pointer to instance of charger's power_supply
1913 * @type: type of charger event
1914 * @msg: optional message passed to uevent_notify fuction
1915 */
1916void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
1917 char *msg)
1918{
1919 struct charger_manager *cm;
1920 bool found_power_supply = false;
1921
1922 if (psy == NULL)
1923 return;
1924
1925 mutex_lock(&cm_list_mtx);
1926 list_for_each_entry(cm, &cm_list, entry) {
1927 found_power_supply = find_power_supply(cm, psy);
1928 if (found_power_supply)
1929 break;
1930 }
1931 mutex_unlock(&cm_list_mtx);
1932
1933 if (!found_power_supply)
1934 return;
1935
1936 switch (type) {
1937 case CM_EVENT_BATT_FULL:
1938 fullbatt_handler(cm);
1939 break;
1940 case CM_EVENT_BATT_OUT:
1941 battout_handler(cm);
1942 break;
1943 case CM_EVENT_BATT_IN:
1944 case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
1945 misc_event_handler(cm, type);
1946 break;
1947 case CM_EVENT_UNKNOWN:
1948 case CM_EVENT_OTHERS:
1949 uevent_notify(cm, msg ? msg : default_event_names[type]);
1950 break;
1951 default:
1952 dev_err(cm->dev, "%s type not specified.\n", __func__);
1953 break;
1954 }
1955}
1956EXPORT_SYMBOL_GPL(cm_notify_event);
1957
Donggeun Kim3bb3dbb2011-12-27 18:47:48 +09001958MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1959MODULE_DESCRIPTION("Charger Manager");
1960MODULE_LICENSE("GPL");