1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) ST-Ericsson SA 2012
4 * Copyright (c) 2012 Sony Mobile Communications AB
6 * Charging algorithm driver for abx500 variants
9 * Johan Palsson <johan.palsson@stericsson.com>
10 * Karl Komierowski <karl.komierowski@stericsson.com>
11 * Arun R Murthy <arun.murthy@stericsson.com>
12 * Author: Imre Sunyi <imre.sunyi@sonymobile.com>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/device.h>
18 #include <linux/hrtimer.h>
19 #include <linux/interrupt.h>
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 #include <linux/platform_device.h>
23 #include <linux/power_supply.h>
24 #include <linux/completion.h>
25 #include <linux/workqueue.h>
26 #include <linux/kobject.h>
28 #include <linux/mfd/core.h>
29 #include <linux/mfd/abx500.h>
30 #include <linux/mfd/abx500/ab8500.h>
31 #include <linux/notifier.h>
33 #include "ab8500-bm.h"
34 #include "ab8500-chargalg.h"
36 /* Watchdog kick interval */
37 #define CHG_WD_INTERVAL (6 * HZ)
39 /* End-of-charge criteria counter */
40 #define EOC_COND_CNT 10
42 /* One hour expressed in seconds */
43 #define ONE_HOUR_IN_SECONDS 3600
45 /* Five minutes expressed in seconds */
46 #define FIVE_MINUTES_IN_SECONDS 300
48 #define CHARGALG_CURR_STEP_LOW 0
49 #define CHARGALG_CURR_STEP_HIGH 100
51 enum abx500_chargers {
57 struct abx500_chargalg_charger_info {
58 enum abx500_chargers conn_chg;
59 enum abx500_chargers prev_conn_chg;
60 enum abx500_chargers online_chg;
61 enum abx500_chargers prev_online_chg;
62 enum abx500_chargers charger_type;
75 struct abx500_chargalg_suspension_status {
76 bool suspended_change;
81 struct abx500_chargalg_current_step_status {
82 bool curr_step_change;
86 struct abx500_chargalg_battery_data {
94 enum abx500_chargalg_states {
97 STATE_CHG_NOT_OK_INIT,
99 STATE_HW_TEMP_PROTECT_INIT,
100 STATE_HW_TEMP_PROTECT,
103 STATE_WAIT_FOR_RECHARGE_INIT,
104 STATE_WAIT_FOR_RECHARGE,
105 STATE_MAINTENANCE_A_INIT,
107 STATE_MAINTENANCE_B_INIT,
109 STATE_TEMP_UNDEROVER_INIT,
110 STATE_TEMP_UNDEROVER,
111 STATE_TEMP_LOWHIGH_INIT,
113 STATE_SUSPENDED_INIT,
115 STATE_OVV_PROTECT_INIT,
117 STATE_SAFETY_TIMER_EXPIRED_INIT,
118 STATE_SAFETY_TIMER_EXPIRED,
119 STATE_BATT_REMOVED_INIT,
121 STATE_WD_EXPIRED_INIT,
125 static const char *states[] = {
130 "HW_TEMP_PROTECT_INIT",
134 "WAIT_FOR_RECHARGE_INIT",
136 "MAINTENANCE_A_INIT",
138 "MAINTENANCE_B_INIT",
140 "TEMP_UNDEROVER_INIT",
148 "SAFETY_TIMER_EXPIRED_INIT",
149 "SAFETY_TIMER_EXPIRED",
156 struct abx500_chargalg_events {
161 bool btemp_underover;
163 bool main_thermal_prot;
164 bool usb_thermal_prot;
167 bool usbchargernotok;
168 bool safety_timer_expired;
169 bool maintenance_timer_expired;
178 * struct abx500_charge_curr_maximization - Charger maximization parameters
179 * @original_iset: the non optimized/maximised charger current
180 * @current_iset: the charging current used at this moment
181 * @test_delta_i: the delta between the current we want to charge and the
182 current that is really going into the battery
183 * @condition_cnt: number of iterations needed before a new charger current
185 * @max_current: maximum charger current
186 * @wait_cnt: to avoid too fast current step down in case of charger
187 * voltage collapse, we insert this delay between step
189 * @level: tells in how many steps the charging current has been
192 struct abx500_charge_curr_maximization {
205 MAXIM_RET_IBAT_TOO_HIGH,
209 * struct abx500_chargalg - abx500 Charging algorithm device information
210 * @dev: pointer to the structure device
211 * @charge_status: battery operating status
212 * @eoc_cnt: counter used to determine end-of_charge
213 * @maintenance_chg: indicate if maintenance charge is active
214 * @t_hyst_norm temperature hysteresis when the temperature has been
215 * over or under normal limits
216 * @t_hyst_lowhigh temperature hysteresis when the temperature has been
217 * over or under the high or low limits
218 * @charge_state: current state of the charging algorithm
219 * @ccm charging current maximization parameters
220 * @chg_info: information about connected charger types
221 * @batt_data: data of the battery
222 * @susp_status: current charger suspension status
223 * @bm: Platform specific battery management information
224 * @curr_status: Current step status for over-current protection
225 * @parent: pointer to the struct abx500
226 * @chargalg_psy: structure that holds the battery properties exposed by
227 * the charging algorithm
228 * @events: structure for information about events triggered
229 * @chargalg_wq: work queue for running the charging algorithm
230 * @chargalg_periodic_work: work to run the charging algorithm periodically
231 * @chargalg_wd_work: work to kick the charger watchdog periodically
232 * @chargalg_work: work to run the charging algorithm instantly
233 * @safety_timer: charging safety timer
234 * @maintenance_timer: maintenance charging timer
235 * @chargalg_kobject: structure of type kobject
237 struct abx500_chargalg {
241 bool maintenance_chg;
244 enum abx500_chargalg_states charge_state;
245 struct abx500_charge_curr_maximization ccm;
246 struct abx500_chargalg_charger_info chg_info;
247 struct abx500_chargalg_battery_data batt_data;
248 struct abx500_chargalg_suspension_status susp_status;
249 struct ab8500 *parent;
250 struct abx500_chargalg_current_step_status curr_status;
251 struct abx500_bm_data *bm;
252 struct power_supply *chargalg_psy;
253 struct ux500_charger *ac_chg;
254 struct ux500_charger *usb_chg;
255 struct abx500_chargalg_events events;
256 struct workqueue_struct *chargalg_wq;
257 struct delayed_work chargalg_periodic_work;
258 struct delayed_work chargalg_wd_work;
259 struct work_struct chargalg_work;
260 struct hrtimer safety_timer;
261 struct hrtimer maintenance_timer;
262 struct kobject chargalg_kobject;
265 /*External charger prepare notifier*/
266 BLOCKING_NOTIFIER_HEAD(charger_notifier_list);
268 /* Main battery properties */
269 static enum power_supply_property abx500_chargalg_props[] = {
270 POWER_SUPPLY_PROP_STATUS,
271 POWER_SUPPLY_PROP_HEALTH,
274 struct abx500_chargalg_sysfs_entry {
275 struct attribute attr;
276 ssize_t (*show)(struct abx500_chargalg *, char *);
277 ssize_t (*store)(struct abx500_chargalg *, const char *, size_t);
281 * abx500_chargalg_safety_timer_expired() - Expiration of the safety timer
282 * @timer: pointer to the hrtimer structure
284 * This function gets called when the safety timer for the charger
287 static enum hrtimer_restart
288 abx500_chargalg_safety_timer_expired(struct hrtimer *timer)
290 struct abx500_chargalg *di = container_of(timer, struct abx500_chargalg,
292 dev_err(di->dev, "Safety timer expired\n");
293 di->events.safety_timer_expired = true;
295 /* Trigger execution of the algorithm instantly */
296 queue_work(di->chargalg_wq, &di->chargalg_work);
298 return HRTIMER_NORESTART;
302 * abx500_chargalg_maintenance_timer_expired() - Expiration of
303 * the maintenance timer
304 * @timer: pointer to the timer structure
306 * This function gets called when the maintenence timer
309 static enum hrtimer_restart
310 abx500_chargalg_maintenance_timer_expired(struct hrtimer *timer)
313 struct abx500_chargalg *di = container_of(timer, struct abx500_chargalg,
316 dev_dbg(di->dev, "Maintenance timer expired\n");
317 di->events.maintenance_timer_expired = true;
319 /* Trigger execution of the algorithm instantly */
320 queue_work(di->chargalg_wq, &di->chargalg_work);
322 return HRTIMER_NORESTART;
326 * abx500_chargalg_state_to() - Change charge state
327 * @di: pointer to the abx500_chargalg structure
329 * This function gets called when a charge state change should occur
331 static void abx500_chargalg_state_to(struct abx500_chargalg *di,
332 enum abx500_chargalg_states state)
335 "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
336 di->charge_state == state ? "NO" : "YES",
338 states[di->charge_state],
342 di->charge_state = state;
345 static int abx500_chargalg_check_charger_enable(struct abx500_chargalg *di)
347 switch (di->charge_state) {
349 case STATE_MAINTENANCE_A:
350 case STATE_MAINTENANCE_B:
356 if (di->chg_info.charger_type & USB_CHG) {
357 return di->usb_chg->ops.check_enable(di->usb_chg,
358 di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
359 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
360 } else if ((di->chg_info.charger_type & AC_CHG) &&
361 !(di->ac_chg->external)) {
362 return di->ac_chg->ops.check_enable(di->ac_chg,
363 di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
364 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
370 * abx500_chargalg_check_charger_connection() - Check charger connection change
371 * @di: pointer to the abx500_chargalg structure
373 * This function will check if there is a change in the charger connection
374 * and change charge state accordingly. AC has precedence over USB.
376 static int abx500_chargalg_check_charger_connection(struct abx500_chargalg *di)
378 if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg ||
379 di->susp_status.suspended_change) {
381 * Charger state changed or suspension
382 * has changed since last update
384 if ((di->chg_info.conn_chg & AC_CHG) &&
385 !di->susp_status.ac_suspended) {
386 dev_dbg(di->dev, "Charging source is AC\n");
387 if (di->chg_info.charger_type != AC_CHG) {
388 di->chg_info.charger_type = AC_CHG;
389 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
391 } else if ((di->chg_info.conn_chg & USB_CHG) &&
392 !di->susp_status.usb_suspended) {
393 dev_dbg(di->dev, "Charging source is USB\n");
394 di->chg_info.charger_type = USB_CHG;
395 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
396 } else if (di->chg_info.conn_chg &&
397 (di->susp_status.ac_suspended ||
398 di->susp_status.usb_suspended)) {
399 dev_dbg(di->dev, "Charging is suspended\n");
400 di->chg_info.charger_type = NO_CHG;
401 abx500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
403 dev_dbg(di->dev, "Charging source is OFF\n");
404 di->chg_info.charger_type = NO_CHG;
405 abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
407 di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
408 di->susp_status.suspended_change = false;
410 return di->chg_info.conn_chg;
414 * abx500_chargalg_check_current_step_status() - Check charging current
416 * @di: pointer to the abx500_chargalg structure
418 * This function will check if there is a change in the charging current step
419 * and change charge state accordingly.
421 static void abx500_chargalg_check_current_step_status
422 (struct abx500_chargalg *di)
424 if (di->curr_status.curr_step_change)
425 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
426 di->curr_status.curr_step_change = false;
430 * abx500_chargalg_start_safety_timer() - Start charging safety timer
431 * @di: pointer to the abx500_chargalg structure
433 * The safety timer is used to avoid overcharging of old or bad batteries.
434 * There are different timers for AC and USB
436 static void abx500_chargalg_start_safety_timer(struct abx500_chargalg *di)
438 /* Charger-dependent expiration time in hours*/
439 int timer_expiration = 0;
441 switch (di->chg_info.charger_type) {
443 timer_expiration = di->bm->main_safety_tmr_h;
447 timer_expiration = di->bm->usb_safety_tmr_h;
451 dev_err(di->dev, "Unknown charger to charge from\n");
455 di->events.safety_timer_expired = false;
456 hrtimer_set_expires_range(&di->safety_timer,
457 ktime_set(timer_expiration * ONE_HOUR_IN_SECONDS, 0),
458 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
459 hrtimer_start_expires(&di->safety_timer, HRTIMER_MODE_REL);
463 * abx500_chargalg_stop_safety_timer() - Stop charging safety timer
464 * @di: pointer to the abx500_chargalg structure
466 * The safety timer is stopped whenever the NORMAL state is exited
468 static void abx500_chargalg_stop_safety_timer(struct abx500_chargalg *di)
470 if (hrtimer_try_to_cancel(&di->safety_timer) >= 0)
471 di->events.safety_timer_expired = false;
475 * abx500_chargalg_start_maintenance_timer() - Start charging maintenance timer
476 * @di: pointer to the abx500_chargalg structure
477 * @duration: duration of ther maintenance timer in hours
479 * The maintenance timer is used to maintain the charge in the battery once
480 * the battery is considered full. These timers are chosen to match the
481 * discharge curve of the battery
483 static void abx500_chargalg_start_maintenance_timer(struct abx500_chargalg *di,
486 hrtimer_set_expires_range(&di->maintenance_timer,
487 ktime_set(duration * ONE_HOUR_IN_SECONDS, 0),
488 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
489 di->events.maintenance_timer_expired = false;
490 hrtimer_start_expires(&di->maintenance_timer, HRTIMER_MODE_REL);
494 * abx500_chargalg_stop_maintenance_timer() - Stop maintenance timer
495 * @di: pointer to the abx500_chargalg structure
497 * The maintenance timer is stopped whenever maintenance ends or when another
500 static void abx500_chargalg_stop_maintenance_timer(struct abx500_chargalg *di)
502 if (hrtimer_try_to_cancel(&di->maintenance_timer) >= 0)
503 di->events.maintenance_timer_expired = false;
507 * abx500_chargalg_kick_watchdog() - Kick charger watchdog
508 * @di: pointer to the abx500_chargalg structure
510 * The charger watchdog have to be kicked periodically whenever the charger is
511 * on, else the ABB will reset the system
513 static int abx500_chargalg_kick_watchdog(struct abx500_chargalg *di)
515 /* Check if charger exists and kick watchdog if charging */
516 if (di->ac_chg && di->ac_chg->ops.kick_wd &&
517 di->chg_info.online_chg & AC_CHG) {
519 * If AB charger watchdog expired, pm2xxx charging
520 * gets disabled. To be safe, kick both AB charger watchdog
521 * and pm2xxx watchdog.
523 if (di->ac_chg->external &&
524 di->usb_chg && di->usb_chg->ops.kick_wd)
525 di->usb_chg->ops.kick_wd(di->usb_chg);
527 return di->ac_chg->ops.kick_wd(di->ac_chg);
529 else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
530 di->chg_info.online_chg & USB_CHG)
531 return di->usb_chg->ops.kick_wd(di->usb_chg);
537 * abx500_chargalg_ac_en() - Turn on/off the AC charger
538 * @di: pointer to the abx500_chargalg structure
539 * @enable: charger on/off
540 * @vset: requested charger output voltage
541 * @iset: requested charger output current
543 * The AC charger will be turned on/off with the requested charge voltage and
546 static int abx500_chargalg_ac_en(struct abx500_chargalg *di, int enable,
549 static int abx500_chargalg_ex_ac_enable_toggle;
551 if (!di->ac_chg || !di->ac_chg->ops.enable)
554 /* Select maximum of what both the charger and the battery supports */
555 if (di->ac_chg->max_out_volt)
556 vset = min(vset, di->ac_chg->max_out_volt);
557 if (di->ac_chg->max_out_curr)
558 iset = min(iset, di->ac_chg->max_out_curr);
560 di->chg_info.ac_iset = iset;
561 di->chg_info.ac_vset = vset;
563 /* Enable external charger */
564 if (enable && di->ac_chg->external &&
565 !abx500_chargalg_ex_ac_enable_toggle) {
566 blocking_notifier_call_chain(&charger_notifier_list,
568 abx500_chargalg_ex_ac_enable_toggle++;
571 return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
575 * abx500_chargalg_usb_en() - Turn on/off the USB charger
576 * @di: pointer to the abx500_chargalg structure
577 * @enable: charger on/off
578 * @vset: requested charger output voltage
579 * @iset: requested charger output current
581 * The USB charger will be turned on/off with the requested charge voltage and
584 static int abx500_chargalg_usb_en(struct abx500_chargalg *di, int enable,
587 if (!di->usb_chg || !di->usb_chg->ops.enable)
590 /* Select maximum of what both the charger and the battery supports */
591 if (di->usb_chg->max_out_volt)
592 vset = min(vset, di->usb_chg->max_out_volt);
593 if (di->usb_chg->max_out_curr)
594 iset = min(iset, di->usb_chg->max_out_curr);
596 di->chg_info.usb_iset = iset;
597 di->chg_info.usb_vset = vset;
599 return di->usb_chg->ops.enable(di->usb_chg, enable, vset, iset);
603 * abx500_chargalg_update_chg_curr() - Update charger current
604 * @di: pointer to the abx500_chargalg structure
605 * @iset: requested charger output current
607 * The charger output current will be updated for the charger
608 * that is currently in use
610 static int abx500_chargalg_update_chg_curr(struct abx500_chargalg *di,
613 /* Check if charger exists and update current if charging */
614 if (di->ac_chg && di->ac_chg->ops.update_curr &&
615 di->chg_info.charger_type & AC_CHG) {
617 * Select maximum of what both the charger
618 * and the battery supports
620 if (di->ac_chg->max_out_curr)
621 iset = min(iset, di->ac_chg->max_out_curr);
623 di->chg_info.ac_iset = iset;
625 return di->ac_chg->ops.update_curr(di->ac_chg, iset);
626 } else if (di->usb_chg && di->usb_chg->ops.update_curr &&
627 di->chg_info.charger_type & USB_CHG) {
629 * Select maximum of what both the charger
630 * and the battery supports
632 if (di->usb_chg->max_out_curr)
633 iset = min(iset, di->usb_chg->max_out_curr);
635 di->chg_info.usb_iset = iset;
637 return di->usb_chg->ops.update_curr(di->usb_chg, iset);
644 * abx500_chargalg_stop_charging() - Stop charging
645 * @di: pointer to the abx500_chargalg structure
647 * This function is called from any state where charging should be stopped.
648 * All charging is disabled and all status parameters and timers are changed
651 static void abx500_chargalg_stop_charging(struct abx500_chargalg *di)
653 abx500_chargalg_ac_en(di, false, 0, 0);
654 abx500_chargalg_usb_en(di, false, 0, 0);
655 abx500_chargalg_stop_safety_timer(di);
656 abx500_chargalg_stop_maintenance_timer(di);
657 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
658 di->maintenance_chg = false;
659 cancel_delayed_work(&di->chargalg_wd_work);
660 power_supply_changed(di->chargalg_psy);
664 * abx500_chargalg_hold_charging() - Pauses charging
665 * @di: pointer to the abx500_chargalg structure
667 * This function is called in the case where maintenance charging has been
668 * disabled and instead a battery voltage mode is entered to check when the
669 * battery voltage has reached a certain recharge voltage
671 static void abx500_chargalg_hold_charging(struct abx500_chargalg *di)
673 abx500_chargalg_ac_en(di, false, 0, 0);
674 abx500_chargalg_usb_en(di, false, 0, 0);
675 abx500_chargalg_stop_safety_timer(di);
676 abx500_chargalg_stop_maintenance_timer(di);
677 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
678 di->maintenance_chg = false;
679 cancel_delayed_work(&di->chargalg_wd_work);
680 power_supply_changed(di->chargalg_psy);
684 * abx500_chargalg_start_charging() - Start the charger
685 * @di: pointer to the abx500_chargalg structure
686 * @vset: requested charger output voltage
687 * @iset: requested charger output current
689 * A charger will be enabled depending on the requested charger type that was
690 * detected previously.
692 static void abx500_chargalg_start_charging(struct abx500_chargalg *di,
695 switch (di->chg_info.charger_type) {
698 "AC parameters: Vset %d, Ich %d\n", vset, iset);
699 abx500_chargalg_usb_en(di, false, 0, 0);
700 abx500_chargalg_ac_en(di, true, vset, iset);
705 "USB parameters: Vset %d, Ich %d\n", vset, iset);
706 abx500_chargalg_ac_en(di, false, 0, 0);
707 abx500_chargalg_usb_en(di, true, vset, iset);
711 dev_err(di->dev, "Unknown charger to charge from\n");
717 * abx500_chargalg_check_temp() - Check battery temperature ranges
718 * @di: pointer to the abx500_chargalg structure
720 * The battery temperature is checked against the predefined limits and the
721 * charge state is changed accordingly
723 static void abx500_chargalg_check_temp(struct abx500_chargalg *di)
725 if (di->batt_data.temp > (di->bm->temp_low + di->t_hyst_norm) &&
726 di->batt_data.temp < (di->bm->temp_high - di->t_hyst_norm)) {
728 di->events.btemp_underover = false;
729 di->events.btemp_lowhigh = false;
731 di->t_hyst_lowhigh = 0;
733 if (((di->batt_data.temp >= di->bm->temp_high) &&
734 (di->batt_data.temp <
735 (di->bm->temp_over - di->t_hyst_lowhigh))) ||
736 ((di->batt_data.temp >
737 (di->bm->temp_under + di->t_hyst_lowhigh)) &&
738 (di->batt_data.temp <= di->bm->temp_low))) {
739 /* TEMP minor!!!!! */
740 di->events.btemp_underover = false;
741 di->events.btemp_lowhigh = true;
742 di->t_hyst_norm = di->bm->temp_hysteresis;
743 di->t_hyst_lowhigh = 0;
744 } else if (di->batt_data.temp <= di->bm->temp_under ||
745 di->batt_data.temp >= di->bm->temp_over) {
746 /* TEMP major!!!!! */
747 di->events.btemp_underover = true;
748 di->events.btemp_lowhigh = false;
750 di->t_hyst_lowhigh = di->bm->temp_hysteresis;
752 /* Within hysteresis */
753 dev_dbg(di->dev, "Within hysteresis limit temp: %d "
754 "hyst_lowhigh %d, hyst normal %d\n",
755 di->batt_data.temp, di->t_hyst_lowhigh,
762 * abx500_chargalg_check_charger_voltage() - Check charger voltage
763 * @di: pointer to the abx500_chargalg structure
765 * Charger voltage is checked against maximum limit
767 static void abx500_chargalg_check_charger_voltage(struct abx500_chargalg *di)
769 if (di->chg_info.usb_volt > di->bm->chg_params->usb_volt_max)
770 di->chg_info.usb_chg_ok = false;
772 di->chg_info.usb_chg_ok = true;
774 if (di->chg_info.ac_volt > di->bm->chg_params->ac_volt_max)
775 di->chg_info.ac_chg_ok = false;
777 di->chg_info.ac_chg_ok = true;
782 * abx500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
783 * @di: pointer to the abx500_chargalg structure
785 * End-of-charge criteria is fulfilled when the battery voltage is above a
786 * certain limit and the battery current is below a certain limit for a
787 * predefined number of consecutive seconds. If true, the battery is full
789 static void abx500_chargalg_end_of_charge(struct abx500_chargalg *di)
791 if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
792 di->charge_state == STATE_NORMAL &&
793 !di->maintenance_chg && (di->batt_data.volt >=
794 di->bm->bat_type[di->bm->batt_id].termination_vol ||
795 di->events.usb_cv_active || di->events.ac_cv_active) &&
796 di->batt_data.avg_curr <
797 di->bm->bat_type[di->bm->batt_id].termination_curr &&
798 di->batt_data.avg_curr > 0) {
799 if (++di->eoc_cnt >= EOC_COND_CNT) {
801 di->charge_status = POWER_SUPPLY_STATUS_FULL;
802 di->maintenance_chg = true;
803 dev_dbg(di->dev, "EOC reached!\n");
804 power_supply_changed(di->chargalg_psy);
807 " EOC limit reached for the %d"
808 " time, out of %d before EOC\n",
817 static void init_maxim_chg_curr(struct abx500_chargalg *di)
819 di->ccm.original_iset =
820 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
821 di->ccm.current_iset =
822 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
823 di->ccm.test_delta_i = di->bm->maxi->charger_curr_step;
824 di->ccm.max_current = di->bm->maxi->chg_curr;
825 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
830 * abx500_chargalg_chg_curr_maxim - increases the charger current to
831 * compensate for the system load
832 * @di pointer to the abx500_chargalg structure
834 * This maximization function is used to raise the charger current to get the
835 * battery current as close to the optimal value as possible. The battery
836 * current during charging is affected by the system load
838 static enum maxim_ret abx500_chargalg_chg_curr_maxim(struct abx500_chargalg *di)
842 if (!di->bm->maxi->ena_maxi)
843 return MAXIM_RET_NOACTION;
845 delta_i = di->ccm.original_iset - di->batt_data.inst_curr;
847 if (di->events.vbus_collapsed) {
848 dev_dbg(di->dev, "Charger voltage has collapsed %d\n",
850 if (di->ccm.wait_cnt == 0) {
851 dev_dbg(di->dev, "lowering current\n");
853 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
854 di->ccm.max_current =
855 di->ccm.current_iset - di->ccm.test_delta_i;
856 di->ccm.current_iset = di->ccm.max_current;
858 return MAXIM_RET_CHANGE;
860 dev_dbg(di->dev, "waiting\n");
861 /* Let's go in here twice before lowering curr again */
862 di->ccm.wait_cnt = (di->ccm.wait_cnt + 1) % 3;
863 return MAXIM_RET_NOACTION;
867 di->ccm.wait_cnt = 0;
869 if ((di->batt_data.inst_curr > di->ccm.original_iset)) {
870 dev_dbg(di->dev, " Maximization Ibat (%dmA) too high"
871 " (limit %dmA) (current iset: %dmA)!\n",
872 di->batt_data.inst_curr, di->ccm.original_iset,
873 di->ccm.current_iset);
875 if (di->ccm.current_iset == di->ccm.original_iset)
876 return MAXIM_RET_NOACTION;
878 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
879 di->ccm.current_iset = di->ccm.original_iset;
882 return MAXIM_RET_IBAT_TOO_HIGH;
885 if (delta_i > di->ccm.test_delta_i &&
886 (di->ccm.current_iset + di->ccm.test_delta_i) <
887 di->ccm.max_current) {
888 if (di->ccm.condition_cnt-- == 0) {
889 /* Increse the iset with cco.test_delta_i */
890 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
891 di->ccm.current_iset += di->ccm.test_delta_i;
893 dev_dbg(di->dev, " Maximization needed, increase"
894 " with %d mA to %dmA (Optimal ibat: %d)"
896 di->ccm.test_delta_i,
897 di->ccm.current_iset,
898 di->ccm.original_iset,
900 return MAXIM_RET_CHANGE;
902 return MAXIM_RET_NOACTION;
905 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
906 return MAXIM_RET_NOACTION;
910 static void handle_maxim_chg_curr(struct abx500_chargalg *di)
915 ret = abx500_chargalg_chg_curr_maxim(di);
917 case MAXIM_RET_CHANGE:
918 result = abx500_chargalg_update_chg_curr(di,
919 di->ccm.current_iset);
921 dev_err(di->dev, "failed to set chg curr\n");
923 case MAXIM_RET_IBAT_TOO_HIGH:
924 result = abx500_chargalg_update_chg_curr(di,
925 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
927 dev_err(di->dev, "failed to set chg curr\n");
930 case MAXIM_RET_NOACTION:
937 static int abx500_chargalg_get_ext_psy_data(struct device *dev, void *data)
939 struct power_supply *psy;
940 struct power_supply *ext = dev_get_drvdata(dev);
941 const char **supplicants = (const char **)ext->supplied_to;
942 struct abx500_chargalg *di;
943 union power_supply_propval ret;
945 bool capacity_updated = false;
947 psy = (struct power_supply *)data;
948 di = power_supply_get_drvdata(psy);
949 /* For all psy where the driver name appears in any supplied_to */
950 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
955 * If external is not registering 'POWER_SUPPLY_PROP_CAPACITY' to its
956 * property because of handling that sysfs entry on its own, this is
957 * the place to get the battery capacity.
959 if (!power_supply_get_property(ext, POWER_SUPPLY_PROP_CAPACITY, &ret)) {
960 di->batt_data.percent = ret.intval;
961 capacity_updated = true;
964 /* Go through all properties for the psy */
965 for (j = 0; j < ext->desc->num_properties; j++) {
966 enum power_supply_property prop;
967 prop = ext->desc->properties[j];
970 * Initialize chargers if not already done.
971 * The ab8500_charger*/
973 ext->desc->type == POWER_SUPPLY_TYPE_MAINS)
974 di->ac_chg = psy_to_ux500_charger(ext);
975 else if (!di->usb_chg &&
976 ext->desc->type == POWER_SUPPLY_TYPE_USB)
977 di->usb_chg = psy_to_ux500_charger(ext);
979 if (power_supply_get_property(ext, prop, &ret))
982 case POWER_SUPPLY_PROP_PRESENT:
983 switch (ext->desc->type) {
984 case POWER_SUPPLY_TYPE_BATTERY:
985 /* Battery present */
987 di->events.batt_rem = false;
988 /* Battery removed */
990 di->events.batt_rem = true;
992 case POWER_SUPPLY_TYPE_MAINS:
993 /* AC disconnected */
995 (di->chg_info.conn_chg & AC_CHG)) {
996 di->chg_info.prev_conn_chg =
997 di->chg_info.conn_chg;
998 di->chg_info.conn_chg &= ~AC_CHG;
1001 else if (ret.intval &&
1002 !(di->chg_info.conn_chg & AC_CHG)) {
1003 di->chg_info.prev_conn_chg =
1004 di->chg_info.conn_chg;
1005 di->chg_info.conn_chg |= AC_CHG;
1008 case POWER_SUPPLY_TYPE_USB:
1009 /* USB disconnected */
1011 (di->chg_info.conn_chg & USB_CHG)) {
1012 di->chg_info.prev_conn_chg =
1013 di->chg_info.conn_chg;
1014 di->chg_info.conn_chg &= ~USB_CHG;
1017 else if (ret.intval &&
1018 !(di->chg_info.conn_chg & USB_CHG)) {
1019 di->chg_info.prev_conn_chg =
1020 di->chg_info.conn_chg;
1021 di->chg_info.conn_chg |= USB_CHG;
1029 case POWER_SUPPLY_PROP_ONLINE:
1030 switch (ext->desc->type) {
1031 case POWER_SUPPLY_TYPE_BATTERY:
1033 case POWER_SUPPLY_TYPE_MAINS:
1036 (di->chg_info.online_chg & AC_CHG)) {
1037 di->chg_info.prev_online_chg =
1038 di->chg_info.online_chg;
1039 di->chg_info.online_chg &= ~AC_CHG;
1042 else if (ret.intval &&
1043 !(di->chg_info.online_chg & AC_CHG)) {
1044 di->chg_info.prev_online_chg =
1045 di->chg_info.online_chg;
1046 di->chg_info.online_chg |= AC_CHG;
1047 queue_delayed_work(di->chargalg_wq,
1048 &di->chargalg_wd_work, 0);
1051 case POWER_SUPPLY_TYPE_USB:
1054 (di->chg_info.online_chg & USB_CHG)) {
1055 di->chg_info.prev_online_chg =
1056 di->chg_info.online_chg;
1057 di->chg_info.online_chg &= ~USB_CHG;
1060 else if (ret.intval &&
1061 !(di->chg_info.online_chg & USB_CHG)) {
1062 di->chg_info.prev_online_chg =
1063 di->chg_info.online_chg;
1064 di->chg_info.online_chg |= USB_CHG;
1065 queue_delayed_work(di->chargalg_wq,
1066 &di->chargalg_wd_work, 0);
1074 case POWER_SUPPLY_PROP_HEALTH:
1075 switch (ext->desc->type) {
1076 case POWER_SUPPLY_TYPE_BATTERY:
1078 case POWER_SUPPLY_TYPE_MAINS:
1079 switch (ret.intval) {
1080 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1081 di->events.mainextchnotok = true;
1082 di->events.main_thermal_prot = false;
1083 di->events.main_ovv = false;
1084 di->events.ac_wd_expired = false;
1086 case POWER_SUPPLY_HEALTH_DEAD:
1087 di->events.ac_wd_expired = true;
1088 di->events.mainextchnotok = false;
1089 di->events.main_ovv = false;
1090 di->events.main_thermal_prot = false;
1092 case POWER_SUPPLY_HEALTH_COLD:
1093 case POWER_SUPPLY_HEALTH_OVERHEAT:
1094 di->events.main_thermal_prot = true;
1095 di->events.mainextchnotok = false;
1096 di->events.main_ovv = false;
1097 di->events.ac_wd_expired = false;
1099 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1100 di->events.main_ovv = true;
1101 di->events.mainextchnotok = false;
1102 di->events.main_thermal_prot = false;
1103 di->events.ac_wd_expired = false;
1105 case POWER_SUPPLY_HEALTH_GOOD:
1106 di->events.main_thermal_prot = false;
1107 di->events.mainextchnotok = false;
1108 di->events.main_ovv = false;
1109 di->events.ac_wd_expired = false;
1116 case POWER_SUPPLY_TYPE_USB:
1117 switch (ret.intval) {
1118 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1119 di->events.usbchargernotok = true;
1120 di->events.usb_thermal_prot = false;
1121 di->events.vbus_ovv = false;
1122 di->events.usb_wd_expired = false;
1124 case POWER_SUPPLY_HEALTH_DEAD:
1125 di->events.usb_wd_expired = true;
1126 di->events.usbchargernotok = false;
1127 di->events.usb_thermal_prot = false;
1128 di->events.vbus_ovv = false;
1130 case POWER_SUPPLY_HEALTH_COLD:
1131 case POWER_SUPPLY_HEALTH_OVERHEAT:
1132 di->events.usb_thermal_prot = true;
1133 di->events.usbchargernotok = false;
1134 di->events.vbus_ovv = false;
1135 di->events.usb_wd_expired = false;
1137 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1138 di->events.vbus_ovv = true;
1139 di->events.usbchargernotok = false;
1140 di->events.usb_thermal_prot = false;
1141 di->events.usb_wd_expired = false;
1143 case POWER_SUPPLY_HEALTH_GOOD:
1144 di->events.usbchargernotok = false;
1145 di->events.usb_thermal_prot = false;
1146 di->events.vbus_ovv = false;
1147 di->events.usb_wd_expired = false;
1157 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1158 switch (ext->desc->type) {
1159 case POWER_SUPPLY_TYPE_BATTERY:
1160 di->batt_data.volt = ret.intval / 1000;
1162 case POWER_SUPPLY_TYPE_MAINS:
1163 di->chg_info.ac_volt = ret.intval / 1000;
1165 case POWER_SUPPLY_TYPE_USB:
1166 di->chg_info.usb_volt = ret.intval / 1000;
1173 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
1174 switch (ext->desc->type) {
1175 case POWER_SUPPLY_TYPE_MAINS:
1176 /* AVG is used to indicate when we are
1179 di->events.ac_cv_active = true;
1181 di->events.ac_cv_active = false;
1184 case POWER_SUPPLY_TYPE_USB:
1185 /* AVG is used to indicate when we are
1188 di->events.usb_cv_active = true;
1190 di->events.usb_cv_active = false;
1198 case POWER_SUPPLY_PROP_TECHNOLOGY:
1199 switch (ext->desc->type) {
1200 case POWER_SUPPLY_TYPE_BATTERY:
1202 di->events.batt_unknown = false;
1204 di->events.batt_unknown = true;
1212 case POWER_SUPPLY_PROP_TEMP:
1213 di->batt_data.temp = ret.intval / 10;
1216 case POWER_SUPPLY_PROP_CURRENT_NOW:
1217 switch (ext->desc->type) {
1218 case POWER_SUPPLY_TYPE_MAINS:
1219 di->chg_info.ac_curr =
1222 case POWER_SUPPLY_TYPE_USB:
1223 di->chg_info.usb_curr =
1226 case POWER_SUPPLY_TYPE_BATTERY:
1227 di->batt_data.inst_curr = ret.intval / 1000;
1234 case POWER_SUPPLY_PROP_CURRENT_AVG:
1235 switch (ext->desc->type) {
1236 case POWER_SUPPLY_TYPE_BATTERY:
1237 di->batt_data.avg_curr = ret.intval / 1000;
1239 case POWER_SUPPLY_TYPE_USB:
1241 di->events.vbus_collapsed = true;
1243 di->events.vbus_collapsed = false;
1249 case POWER_SUPPLY_PROP_CAPACITY:
1250 if (!capacity_updated)
1251 di->batt_data.percent = ret.intval;
1261 * abx500_chargalg_external_power_changed() - callback for power supply changes
1262 * @psy: pointer to the structure power_supply
1264 * This function is the entry point of the pointer external_power_changed
1265 * of the structure power_supply.
1266 * This function gets executed when there is a change in any external power
1267 * supply that this driver needs to be notified of.
1269 static void abx500_chargalg_external_power_changed(struct power_supply *psy)
1271 struct abx500_chargalg *di = power_supply_get_drvdata(psy);
1274 * Trigger execution of the algorithm instantly and read
1275 * all power_supply properties there instead
1277 queue_work(di->chargalg_wq, &di->chargalg_work);
1281 * abx500_chargalg_algorithm() - Main function for the algorithm
1282 * @di: pointer to the abx500_chargalg structure
1284 * This is the main control function for the charging algorithm.
1285 * It is called periodically or when something happens that will
1286 * trigger a state change
1288 static void abx500_chargalg_algorithm(struct abx500_chargalg *di)
1294 /* Collect data from all power_supply class devices */
1295 class_for_each_device(power_supply_class, NULL,
1296 di->chargalg_psy, abx500_chargalg_get_ext_psy_data);
1298 abx500_chargalg_end_of_charge(di);
1299 abx500_chargalg_check_temp(di);
1300 abx500_chargalg_check_charger_voltage(di);
1302 charger_status = abx500_chargalg_check_charger_connection(di);
1303 abx500_chargalg_check_current_step_status(di);
1305 if (is_ab8500(di->parent)) {
1306 ret = abx500_chargalg_check_charger_enable(di);
1308 dev_err(di->dev, "Checking charger is enabled error"
1309 ": Returned Value %d\n", ret);
1313 * First check if we have a charger connected.
1314 * Also we don't allow charging of unknown batteries if configured
1317 if (!charger_status ||
1318 (di->events.batt_unknown && !di->bm->chg_unknown_bat)) {
1319 if (di->charge_state != STATE_HANDHELD) {
1320 di->events.safety_timer_expired = false;
1321 abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
1325 /* If suspended, we should not continue checking the flags */
1326 else if (di->charge_state == STATE_SUSPENDED_INIT ||
1327 di->charge_state == STATE_SUSPENDED) {
1328 /* We don't do anything here, just don,t continue */
1331 /* Safety timer expiration */
1332 else if (di->events.safety_timer_expired) {
1333 if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
1334 abx500_chargalg_state_to(di,
1335 STATE_SAFETY_TIMER_EXPIRED_INIT);
1338 * Check if any interrupts has occured
1339 * that will prevent us from charging
1342 /* Battery removed */
1343 else if (di->events.batt_rem) {
1344 if (di->charge_state != STATE_BATT_REMOVED)
1345 abx500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
1347 /* Main or USB charger not ok. */
1348 else if (di->events.mainextchnotok || di->events.usbchargernotok) {
1350 * If vbus_collapsed is set, we have to lower the charger
1351 * current, which is done in the normal state below
1353 if (di->charge_state != STATE_CHG_NOT_OK &&
1354 !di->events.vbus_collapsed)
1355 abx500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
1357 /* VBUS, Main or VBAT OVV. */
1358 else if (di->events.vbus_ovv ||
1359 di->events.main_ovv ||
1360 di->events.batt_ovv ||
1361 !di->chg_info.usb_chg_ok ||
1362 !di->chg_info.ac_chg_ok) {
1363 if (di->charge_state != STATE_OVV_PROTECT)
1364 abx500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
1366 /* USB Thermal, stop charging */
1367 else if (di->events.main_thermal_prot ||
1368 di->events.usb_thermal_prot) {
1369 if (di->charge_state != STATE_HW_TEMP_PROTECT)
1370 abx500_chargalg_state_to(di,
1371 STATE_HW_TEMP_PROTECT_INIT);
1373 /* Battery temp over/under */
1374 else if (di->events.btemp_underover) {
1375 if (di->charge_state != STATE_TEMP_UNDEROVER)
1376 abx500_chargalg_state_to(di,
1377 STATE_TEMP_UNDEROVER_INIT);
1379 /* Watchdog expired */
1380 else if (di->events.ac_wd_expired ||
1381 di->events.usb_wd_expired) {
1382 if (di->charge_state != STATE_WD_EXPIRED)
1383 abx500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
1385 /* Battery temp high/low */
1386 else if (di->events.btemp_lowhigh) {
1387 if (di->charge_state != STATE_TEMP_LOWHIGH)
1388 abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
1392 "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
1393 "State %s Active_chg %d Chg_status %d AC %d USB %d "
1394 "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
1395 "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
1397 di->batt_data.avg_curr,
1398 di->batt_data.inst_curr,
1400 di->batt_data.percent,
1401 di->maintenance_chg,
1402 states[di->charge_state],
1403 di->chg_info.charger_type,
1405 di->chg_info.conn_chg & AC_CHG,
1406 di->chg_info.conn_chg & USB_CHG,
1407 di->chg_info.online_chg & AC_CHG,
1408 di->chg_info.online_chg & USB_CHG,
1409 di->events.ac_cv_active,
1410 di->events.usb_cv_active,
1411 di->chg_info.ac_curr,
1412 di->chg_info.usb_curr,
1413 di->chg_info.ac_vset,
1414 di->chg_info.ac_iset,
1415 di->chg_info.usb_vset,
1416 di->chg_info.usb_iset);
1418 switch (di->charge_state) {
1419 case STATE_HANDHELD_INIT:
1420 abx500_chargalg_stop_charging(di);
1421 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
1422 abx500_chargalg_state_to(di, STATE_HANDHELD);
1425 case STATE_HANDHELD:
1428 case STATE_SUSPENDED_INIT:
1429 if (di->susp_status.ac_suspended)
1430 abx500_chargalg_ac_en(di, false, 0, 0);
1431 if (di->susp_status.usb_suspended)
1432 abx500_chargalg_usb_en(di, false, 0, 0);
1433 abx500_chargalg_stop_safety_timer(di);
1434 abx500_chargalg_stop_maintenance_timer(di);
1435 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1436 di->maintenance_chg = false;
1437 abx500_chargalg_state_to(di, STATE_SUSPENDED);
1438 power_supply_changed(di->chargalg_psy);
1441 case STATE_SUSPENDED:
1442 /* CHARGING is suspended */
1445 case STATE_BATT_REMOVED_INIT:
1446 abx500_chargalg_stop_charging(di);
1447 abx500_chargalg_state_to(di, STATE_BATT_REMOVED);
1450 case STATE_BATT_REMOVED:
1451 if (!di->events.batt_rem)
1452 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1455 case STATE_HW_TEMP_PROTECT_INIT:
1456 abx500_chargalg_stop_charging(di);
1457 abx500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
1460 case STATE_HW_TEMP_PROTECT:
1461 if (!di->events.main_thermal_prot &&
1462 !di->events.usb_thermal_prot)
1463 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1466 case STATE_OVV_PROTECT_INIT:
1467 abx500_chargalg_stop_charging(di);
1468 abx500_chargalg_state_to(di, STATE_OVV_PROTECT);
1471 case STATE_OVV_PROTECT:
1472 if (!di->events.vbus_ovv &&
1473 !di->events.main_ovv &&
1474 !di->events.batt_ovv &&
1475 di->chg_info.usb_chg_ok &&
1476 di->chg_info.ac_chg_ok)
1477 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1480 case STATE_CHG_NOT_OK_INIT:
1481 abx500_chargalg_stop_charging(di);
1482 abx500_chargalg_state_to(di, STATE_CHG_NOT_OK);
1485 case STATE_CHG_NOT_OK:
1486 if (!di->events.mainextchnotok &&
1487 !di->events.usbchargernotok)
1488 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1491 case STATE_SAFETY_TIMER_EXPIRED_INIT:
1492 abx500_chargalg_stop_charging(di);
1493 abx500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
1496 case STATE_SAFETY_TIMER_EXPIRED:
1497 /* We exit this state when charger is removed */
1500 case STATE_NORMAL_INIT:
1501 if (di->curr_status.curr_step == CHARGALG_CURR_STEP_LOW)
1502 abx500_chargalg_stop_charging(di);
1504 curr_step_lvl = di->bm->bat_type[
1505 di->bm->batt_id].normal_cur_lvl
1506 * di->curr_status.curr_step
1507 / CHARGALG_CURR_STEP_HIGH;
1508 abx500_chargalg_start_charging(di,
1509 di->bm->bat_type[di->bm->batt_id]
1510 .normal_vol_lvl, curr_step_lvl);
1513 abx500_chargalg_state_to(di, STATE_NORMAL);
1514 abx500_chargalg_start_safety_timer(di);
1515 abx500_chargalg_stop_maintenance_timer(di);
1516 init_maxim_chg_curr(di);
1517 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1519 di->maintenance_chg = false;
1520 power_supply_changed(di->chargalg_psy);
1525 handle_maxim_chg_curr(di);
1526 if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
1527 di->maintenance_chg) {
1528 if (di->bm->no_maintenance)
1529 abx500_chargalg_state_to(di,
1530 STATE_WAIT_FOR_RECHARGE_INIT);
1532 abx500_chargalg_state_to(di,
1533 STATE_MAINTENANCE_A_INIT);
1537 /* This state will be used when the maintenance state is disabled */
1538 case STATE_WAIT_FOR_RECHARGE_INIT:
1539 abx500_chargalg_hold_charging(di);
1540 abx500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
1543 case STATE_WAIT_FOR_RECHARGE:
1544 if (di->batt_data.percent <=
1545 di->bm->bat_type[di->bm->batt_id].
1547 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1550 case STATE_MAINTENANCE_A_INIT:
1551 abx500_chargalg_stop_safety_timer(di);
1552 abx500_chargalg_start_maintenance_timer(di,
1554 di->bm->batt_id].maint_a_chg_timer_h);
1555 abx500_chargalg_start_charging(di,
1557 di->bm->batt_id].maint_a_vol_lvl,
1559 di->bm->batt_id].maint_a_cur_lvl);
1560 abx500_chargalg_state_to(di, STATE_MAINTENANCE_A);
1561 power_supply_changed(di->chargalg_psy);
1564 case STATE_MAINTENANCE_A:
1565 if (di->events.maintenance_timer_expired) {
1566 abx500_chargalg_stop_maintenance_timer(di);
1567 abx500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
1571 case STATE_MAINTENANCE_B_INIT:
1572 abx500_chargalg_start_maintenance_timer(di,
1574 di->bm->batt_id].maint_b_chg_timer_h);
1575 abx500_chargalg_start_charging(di,
1577 di->bm->batt_id].maint_b_vol_lvl,
1579 di->bm->batt_id].maint_b_cur_lvl);
1580 abx500_chargalg_state_to(di, STATE_MAINTENANCE_B);
1581 power_supply_changed(di->chargalg_psy);
1584 case STATE_MAINTENANCE_B:
1585 if (di->events.maintenance_timer_expired) {
1586 abx500_chargalg_stop_maintenance_timer(di);
1587 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1591 case STATE_TEMP_LOWHIGH_INIT:
1592 abx500_chargalg_start_charging(di,
1594 di->bm->batt_id].low_high_vol_lvl,
1596 di->bm->batt_id].low_high_cur_lvl);
1597 abx500_chargalg_stop_maintenance_timer(di);
1598 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1599 abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
1600 power_supply_changed(di->chargalg_psy);
1603 case STATE_TEMP_LOWHIGH:
1604 if (!di->events.btemp_lowhigh)
1605 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1608 case STATE_WD_EXPIRED_INIT:
1609 abx500_chargalg_stop_charging(di);
1610 abx500_chargalg_state_to(di, STATE_WD_EXPIRED);
1613 case STATE_WD_EXPIRED:
1614 if (!di->events.ac_wd_expired &&
1615 !di->events.usb_wd_expired)
1616 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1619 case STATE_TEMP_UNDEROVER_INIT:
1620 abx500_chargalg_stop_charging(di);
1621 abx500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
1624 case STATE_TEMP_UNDEROVER:
1625 if (!di->events.btemp_underover)
1626 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1630 /* Start charging directly if the new state is a charge state */
1631 if (di->charge_state == STATE_NORMAL_INIT ||
1632 di->charge_state == STATE_MAINTENANCE_A_INIT ||
1633 di->charge_state == STATE_MAINTENANCE_B_INIT)
1634 queue_work(di->chargalg_wq, &di->chargalg_work);
1638 * abx500_chargalg_periodic_work() - Periodic work for the algorithm
1639 * @work: pointer to the work_struct structure
1641 * Work queue function for the charging algorithm
1643 static void abx500_chargalg_periodic_work(struct work_struct *work)
1645 struct abx500_chargalg *di = container_of(work,
1646 struct abx500_chargalg, chargalg_periodic_work.work);
1648 abx500_chargalg_algorithm(di);
1651 * If a charger is connected then the battery has to be monitored
1652 * frequently, else the work can be delayed.
1654 if (di->chg_info.conn_chg)
1655 queue_delayed_work(di->chargalg_wq,
1656 &di->chargalg_periodic_work,
1657 di->bm->interval_charging * HZ);
1659 queue_delayed_work(di->chargalg_wq,
1660 &di->chargalg_periodic_work,
1661 di->bm->interval_not_charging * HZ);
1665 * abx500_chargalg_wd_work() - periodic work to kick the charger watchdog
1666 * @work: pointer to the work_struct structure
1668 * Work queue function for kicking the charger watchdog
1670 static void abx500_chargalg_wd_work(struct work_struct *work)
1673 struct abx500_chargalg *di = container_of(work,
1674 struct abx500_chargalg, chargalg_wd_work.work);
1676 dev_dbg(di->dev, "abx500_chargalg_wd_work\n");
1678 ret = abx500_chargalg_kick_watchdog(di);
1680 dev_err(di->dev, "failed to kick watchdog\n");
1682 queue_delayed_work(di->chargalg_wq,
1683 &di->chargalg_wd_work, CHG_WD_INTERVAL);
1687 * abx500_chargalg_work() - Work to run the charging algorithm instantly
1688 * @work: pointer to the work_struct structure
1690 * Work queue function for calling the charging algorithm
1692 static void abx500_chargalg_work(struct work_struct *work)
1694 struct abx500_chargalg *di = container_of(work,
1695 struct abx500_chargalg, chargalg_work);
1697 abx500_chargalg_algorithm(di);
1701 * abx500_chargalg_get_property() - get the chargalg properties
1702 * @psy: pointer to the power_supply structure
1703 * @psp: pointer to the power_supply_property structure
1704 * @val: pointer to the power_supply_propval union
1706 * This function gets called when an application tries to get the
1707 * chargalg properties by reading the sysfs files.
1708 * status: charging/discharging/full/unknown
1709 * health: health of the battery
1710 * Returns error code in case of failure else 0 on success
1712 static int abx500_chargalg_get_property(struct power_supply *psy,
1713 enum power_supply_property psp,
1714 union power_supply_propval *val)
1716 struct abx500_chargalg *di = power_supply_get_drvdata(psy);
1719 case POWER_SUPPLY_PROP_STATUS:
1720 val->intval = di->charge_status;
1722 case POWER_SUPPLY_PROP_HEALTH:
1723 if (di->events.batt_ovv) {
1724 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
1725 } else if (di->events.btemp_underover) {
1726 if (di->batt_data.temp <= di->bm->temp_under)
1727 val->intval = POWER_SUPPLY_HEALTH_COLD;
1729 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
1730 } else if (di->charge_state == STATE_SAFETY_TIMER_EXPIRED ||
1731 di->charge_state == STATE_SAFETY_TIMER_EXPIRED_INIT) {
1732 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
1734 val->intval = POWER_SUPPLY_HEALTH_GOOD;
1743 /* Exposure to the sysfs interface */
1745 static ssize_t abx500_chargalg_curr_step_show(struct abx500_chargalg *di,
1748 return sprintf(buf, "%d\n", di->curr_status.curr_step);
1751 static ssize_t abx500_chargalg_curr_step_store(struct abx500_chargalg *di,
1752 const char *buf, size_t length)
1757 ret = kstrtol(buf, 10, ¶m);
1761 di->curr_status.curr_step = param;
1762 if (di->curr_status.curr_step >= CHARGALG_CURR_STEP_LOW &&
1763 di->curr_status.curr_step <= CHARGALG_CURR_STEP_HIGH) {
1764 di->curr_status.curr_step_change = true;
1765 queue_work(di->chargalg_wq, &di->chargalg_work);
1767 dev_info(di->dev, "Wrong current step\n"
1768 "Enter 0. Disable AC/USB Charging\n"
1769 "1--100. Set AC/USB charging current step\n"
1770 "100. Enable AC/USB Charging\n");
1776 static ssize_t abx500_chargalg_en_show(struct abx500_chargalg *di,
1779 return sprintf(buf, "%d\n",
1780 di->susp_status.ac_suspended &&
1781 di->susp_status.usb_suspended);
1784 static ssize_t abx500_chargalg_en_store(struct abx500_chargalg *di,
1785 const char *buf, size_t length)
1791 ret = kstrtol(buf, 10, ¶m);
1798 /* Disable charging */
1799 di->susp_status.ac_suspended = true;
1800 di->susp_status.usb_suspended = true;
1801 di->susp_status.suspended_change = true;
1802 /* Trigger a state change */
1803 queue_work(di->chargalg_wq,
1804 &di->chargalg_work);
1807 /* Enable AC Charging */
1808 di->susp_status.ac_suspended = false;
1809 di->susp_status.suspended_change = true;
1810 /* Trigger a state change */
1811 queue_work(di->chargalg_wq,
1812 &di->chargalg_work);
1815 /* Enable USB charging */
1816 di->susp_status.usb_suspended = false;
1817 di->susp_status.suspended_change = true;
1818 /* Trigger a state change */
1819 queue_work(di->chargalg_wq,
1820 &di->chargalg_work);
1823 dev_info(di->dev, "Wrong input\n"
1824 "Enter 0. Disable AC/USB Charging\n"
1825 "1. Enable AC charging\n"
1826 "2. Enable USB Charging\n");
1831 static struct abx500_chargalg_sysfs_entry abx500_chargalg_en_charger =
1832 __ATTR(chargalg, 0644, abx500_chargalg_en_show,
1833 abx500_chargalg_en_store);
1835 static struct abx500_chargalg_sysfs_entry abx500_chargalg_curr_step =
1836 __ATTR(chargalg_curr_step, 0644, abx500_chargalg_curr_step_show,
1837 abx500_chargalg_curr_step_store);
1839 static ssize_t abx500_chargalg_sysfs_show(struct kobject *kobj,
1840 struct attribute *attr, char *buf)
1842 struct abx500_chargalg_sysfs_entry *entry = container_of(attr,
1843 struct abx500_chargalg_sysfs_entry, attr);
1845 struct abx500_chargalg *di = container_of(kobj,
1846 struct abx500_chargalg, chargalg_kobject);
1851 return entry->show(di, buf);
1854 static ssize_t abx500_chargalg_sysfs_charger(struct kobject *kobj,
1855 struct attribute *attr, const char *buf, size_t length)
1857 struct abx500_chargalg_sysfs_entry *entry = container_of(attr,
1858 struct abx500_chargalg_sysfs_entry, attr);
1860 struct abx500_chargalg *di = container_of(kobj,
1861 struct abx500_chargalg, chargalg_kobject);
1866 return entry->store(di, buf, length);
1869 static struct attribute *abx500_chargalg_chg[] = {
1870 &abx500_chargalg_en_charger.attr,
1871 &abx500_chargalg_curr_step.attr,
1875 static const struct sysfs_ops abx500_chargalg_sysfs_ops = {
1876 .show = abx500_chargalg_sysfs_show,
1877 .store = abx500_chargalg_sysfs_charger,
1880 static struct kobj_type abx500_chargalg_ktype = {
1881 .sysfs_ops = &abx500_chargalg_sysfs_ops,
1882 .default_attrs = abx500_chargalg_chg,
1886 * abx500_chargalg_sysfs_exit() - de-init of sysfs entry
1887 * @di: pointer to the struct abx500_chargalg
1889 * This function removes the entry in sysfs.
1891 static void abx500_chargalg_sysfs_exit(struct abx500_chargalg *di)
1893 kobject_del(&di->chargalg_kobject);
1897 * abx500_chargalg_sysfs_init() - init of sysfs entry
1898 * @di: pointer to the struct abx500_chargalg
1900 * This function adds an entry in sysfs.
1901 * Returns error code in case of failure else 0(on success)
1903 static int abx500_chargalg_sysfs_init(struct abx500_chargalg *di)
1907 ret = kobject_init_and_add(&di->chargalg_kobject,
1908 &abx500_chargalg_ktype,
1909 NULL, "abx500_chargalg");
1911 dev_err(di->dev, "failed to create sysfs entry\n");
1915 /* Exposure to the sysfs interface <<END>> */
1917 static int __maybe_unused abx500_chargalg_resume(struct device *dev)
1919 struct abx500_chargalg *di = dev_get_drvdata(dev);
1921 /* Kick charger watchdog if charging (any charger online) */
1922 if (di->chg_info.online_chg)
1923 queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
1926 * Run the charging algorithm directly to be sure we don't
1929 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1934 static int __maybe_unused abx500_chargalg_suspend(struct device *dev)
1936 struct abx500_chargalg *di = dev_get_drvdata(dev);
1938 if (di->chg_info.online_chg)
1939 cancel_delayed_work_sync(&di->chargalg_wd_work);
1941 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1946 static int abx500_chargalg_remove(struct platform_device *pdev)
1948 struct abx500_chargalg *di = platform_get_drvdata(pdev);
1950 /* sysfs interface to enable/disbale charging from user space */
1951 abx500_chargalg_sysfs_exit(di);
1953 hrtimer_cancel(&di->safety_timer);
1954 hrtimer_cancel(&di->maintenance_timer);
1956 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1957 cancel_delayed_work_sync(&di->chargalg_wd_work);
1958 cancel_work_sync(&di->chargalg_work);
1960 /* Delete the work queue */
1961 destroy_workqueue(di->chargalg_wq);
1963 power_supply_unregister(di->chargalg_psy);
1968 static char *supply_interface[] = {
1972 static const struct power_supply_desc abx500_chargalg_desc = {
1973 .name = "abx500_chargalg",
1974 .type = POWER_SUPPLY_TYPE_BATTERY,
1975 .properties = abx500_chargalg_props,
1976 .num_properties = ARRAY_SIZE(abx500_chargalg_props),
1977 .get_property = abx500_chargalg_get_property,
1978 .external_power_changed = abx500_chargalg_external_power_changed,
1981 static int abx500_chargalg_probe(struct platform_device *pdev)
1983 struct device_node *np = pdev->dev.of_node;
1984 struct power_supply_config psy_cfg = {};
1985 struct abx500_chargalg *di;
1988 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1990 dev_err(&pdev->dev, "%s no mem for ab8500_chargalg\n", __func__);
1994 di->bm = &ab8500_bm_data;
1996 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
1998 dev_err(&pdev->dev, "failed to get battery information\n");
2002 /* get device struct and parent */
2003 di->dev = &pdev->dev;
2004 di->parent = dev_get_drvdata(pdev->dev.parent);
2006 psy_cfg.supplied_to = supply_interface;
2007 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
2008 psy_cfg.drv_data = di;
2010 /* Initilialize safety timer */
2011 hrtimer_init(&di->safety_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
2012 di->safety_timer.function = abx500_chargalg_safety_timer_expired;
2014 /* Initilialize maintenance timer */
2015 hrtimer_init(&di->maintenance_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
2016 di->maintenance_timer.function =
2017 abx500_chargalg_maintenance_timer_expired;
2019 /* Create a work queue for the chargalg */
2020 di->chargalg_wq = alloc_ordered_workqueue("abx500_chargalg_wq",
2022 if (di->chargalg_wq == NULL) {
2023 dev_err(di->dev, "failed to create work queue\n");
2027 /* Init work for chargalg */
2028 INIT_DEFERRABLE_WORK(&di->chargalg_periodic_work,
2029 abx500_chargalg_periodic_work);
2030 INIT_DEFERRABLE_WORK(&di->chargalg_wd_work,
2031 abx500_chargalg_wd_work);
2033 /* Init work for chargalg */
2034 INIT_WORK(&di->chargalg_work, abx500_chargalg_work);
2036 /* To detect charger at startup */
2037 di->chg_info.prev_conn_chg = -1;
2039 /* Register chargalg power supply class */
2040 di->chargalg_psy = power_supply_register(di->dev, &abx500_chargalg_desc,
2042 if (IS_ERR(di->chargalg_psy)) {
2043 dev_err(di->dev, "failed to register chargalg psy\n");
2044 ret = PTR_ERR(di->chargalg_psy);
2045 goto free_chargalg_wq;
2048 platform_set_drvdata(pdev, di);
2050 /* sysfs interface to enable/disable charging from user space */
2051 ret = abx500_chargalg_sysfs_init(di);
2053 dev_err(di->dev, "failed to create sysfs entry\n");
2056 di->curr_status.curr_step = CHARGALG_CURR_STEP_HIGH;
2058 /* Run the charging algorithm */
2059 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
2061 dev_info(di->dev, "probe success\n");
2065 power_supply_unregister(di->chargalg_psy);
2067 destroy_workqueue(di->chargalg_wq);
2071 static SIMPLE_DEV_PM_OPS(abx500_chargalg_pm_ops, abx500_chargalg_suspend, abx500_chargalg_resume);
2073 static const struct of_device_id ab8500_chargalg_match[] = {
2074 { .compatible = "stericsson,ab8500-chargalg", },
2078 static struct platform_driver abx500_chargalg_driver = {
2079 .probe = abx500_chargalg_probe,
2080 .remove = abx500_chargalg_remove,
2082 .name = "ab8500-chargalg",
2083 .of_match_table = ab8500_chargalg_match,
2084 .pm = &abx500_chargalg_pm_ops,
2088 module_platform_driver(abx500_chargalg_driver);
2090 MODULE_LICENSE("GPL v2");
2091 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2092 MODULE_ALIAS("platform:abx500-chargalg");
2093 MODULE_DESCRIPTION("abx500 battery charging algorithm");