2 * Copyright (C) ST-Ericsson SA 2012
4 * Charging algorithm driver for abx500 variants
6 * License Terms: GNU General Public License v2
8 * Johan Palsson <johan.palsson@stericsson.com>
9 * Karl Komierowski <karl.komierowski@stericsson.com>
10 * Arun R Murthy <arun.murthy@stericsson.com>
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21 #include <linux/completion.h>
22 #include <linux/workqueue.h>
23 #include <linux/kobject.h>
25 #include <linux/mfd/core.h>
26 #include <linux/mfd/abx500.h>
27 #include <linux/mfd/abx500/ux500_chargalg.h>
28 #include <linux/mfd/abx500/ab8500-bm.h>
30 /* Watchdog kick interval */
31 #define CHG_WD_INTERVAL (6 * HZ)
33 /* End-of-charge criteria counter */
34 #define EOC_COND_CNT 10
36 #define to_abx500_chargalg_device_info(x) container_of((x), \
37 struct abx500_chargalg, chargalg_psy);
39 enum abx500_chargers
{
45 struct abx500_chargalg_charger_info
{
46 enum abx500_chargers conn_chg
;
47 enum abx500_chargers prev_conn_chg
;
48 enum abx500_chargers online_chg
;
49 enum abx500_chargers prev_online_chg
;
50 enum abx500_chargers charger_type
;
63 struct abx500_chargalg_suspension_status
{
64 bool suspended_change
;
69 struct abx500_chargalg_battery_data
{
77 enum abx500_chargalg_states
{
80 STATE_CHG_NOT_OK_INIT
,
82 STATE_HW_TEMP_PROTECT_INIT
,
83 STATE_HW_TEMP_PROTECT
,
86 STATE_WAIT_FOR_RECHARGE_INIT
,
87 STATE_WAIT_FOR_RECHARGE
,
88 STATE_MAINTENANCE_A_INIT
,
90 STATE_MAINTENANCE_B_INIT
,
92 STATE_TEMP_UNDEROVER_INIT
,
94 STATE_TEMP_LOWHIGH_INIT
,
98 STATE_OVV_PROTECT_INIT
,
100 STATE_SAFETY_TIMER_EXPIRED_INIT
,
101 STATE_SAFETY_TIMER_EXPIRED
,
102 STATE_BATT_REMOVED_INIT
,
104 STATE_WD_EXPIRED_INIT
,
108 static const char *states
[] = {
113 "HW_TEMP_PROTECT_INIT",
117 "WAIT_FOR_RECHARGE_INIT",
119 "MAINTENANCE_A_INIT",
121 "MAINTENANCE_B_INIT",
123 "TEMP_UNDEROVER_INIT",
131 "SAFETY_TIMER_EXPIRED_INIT",
132 "SAFETY_TIMER_EXPIRED",
139 struct abx500_chargalg_events
{
144 bool btemp_underover
;
146 bool main_thermal_prot
;
147 bool usb_thermal_prot
;
150 bool usbchargernotok
;
151 bool safety_timer_expired
;
152 bool maintenance_timer_expired
;
161 * struct abx500_charge_curr_maximization - Charger maximization parameters
162 * @original_iset: the non optimized/maximised charger current
163 * @current_iset: the charging current used at this moment
164 * @test_delta_i: the delta between the current we want to charge and the
165 current that is really going into the battery
166 * @condition_cnt: number of iterations needed before a new charger current
168 * @max_current: maximum charger current
169 * @wait_cnt: to avoid too fast current step down in case of charger
170 * voltage collapse, we insert this delay between step
172 * @level: tells in how many steps the charging current has been
175 struct abx500_charge_curr_maximization
{
188 MAXIM_RET_IBAT_TOO_HIGH
,
192 * struct abx500_chargalg - abx500 Charging algorithm device information
193 * @dev: pointer to the structure device
194 * @charge_status: battery operating status
195 * @eoc_cnt: counter used to determine end-of_charge
196 * @maintenance_chg: indicate if maintenance charge is active
197 * @t_hyst_norm temperature hysteresis when the temperature has been
198 * over or under normal limits
199 * @t_hyst_lowhigh temperature hysteresis when the temperature has been
200 * over or under the high or low limits
201 * @charge_state: current state of the charging algorithm
202 * @ccm charging current maximization parameters
203 * @chg_info: information about connected charger types
204 * @batt_data: data of the battery
205 * @susp_status: current charger suspension status
206 * @bm: Platform specific battery management information
207 * @chargalg_psy: structure that holds the battery properties exposed by
208 * the charging algorithm
209 * @events: structure for information about events triggered
210 * @chargalg_wq: work queue for running the charging algorithm
211 * @chargalg_periodic_work: work to run the charging algorithm periodically
212 * @chargalg_wd_work: work to kick the charger watchdog periodically
213 * @chargalg_work: work to run the charging algorithm instantly
214 * @safety_timer: charging safety timer
215 * @maintenance_timer: maintenance charging timer
216 * @chargalg_kobject: structure of type kobject
218 struct abx500_chargalg
{
222 bool maintenance_chg
;
225 enum abx500_chargalg_states charge_state
;
226 struct abx500_charge_curr_maximization ccm
;
227 struct abx500_chargalg_charger_info chg_info
;
228 struct abx500_chargalg_battery_data batt_data
;
229 struct abx500_chargalg_suspension_status susp_status
;
230 struct abx500_bm_data
*bm
;
231 struct power_supply chargalg_psy
;
232 struct ux500_charger
*ac_chg
;
233 struct ux500_charger
*usb_chg
;
234 struct abx500_chargalg_events events
;
235 struct workqueue_struct
*chargalg_wq
;
236 struct delayed_work chargalg_periodic_work
;
237 struct delayed_work chargalg_wd_work
;
238 struct work_struct chargalg_work
;
239 struct timer_list safety_timer
;
240 struct timer_list maintenance_timer
;
241 struct kobject chargalg_kobject
;
244 /* Main battery properties */
245 static enum power_supply_property abx500_chargalg_props
[] = {
246 POWER_SUPPLY_PROP_STATUS
,
247 POWER_SUPPLY_PROP_HEALTH
,
251 * abx500_chargalg_safety_timer_expired() - Expiration of the safety timer
252 * @data: pointer to the abx500_chargalg structure
254 * This function gets called when the safety timer for the charger
257 static void abx500_chargalg_safety_timer_expired(unsigned long data
)
259 struct abx500_chargalg
*di
= (struct abx500_chargalg
*) data
;
260 dev_err(di
->dev
, "Safety timer expired\n");
261 di
->events
.safety_timer_expired
= true;
263 /* Trigger execution of the algorithm instantly */
264 queue_work(di
->chargalg_wq
, &di
->chargalg_work
);
268 * abx500_chargalg_maintenance_timer_expired() - Expiration of
269 * the maintenance timer
270 * @i: pointer to the abx500_chargalg structure
272 * This function gets called when the maintenence timer
275 static void abx500_chargalg_maintenance_timer_expired(unsigned long data
)
278 struct abx500_chargalg
*di
= (struct abx500_chargalg
*) data
;
279 dev_dbg(di
->dev
, "Maintenance timer expired\n");
280 di
->events
.maintenance_timer_expired
= true;
282 /* Trigger execution of the algorithm instantly */
283 queue_work(di
->chargalg_wq
, &di
->chargalg_work
);
287 * abx500_chargalg_state_to() - Change charge state
288 * @di: pointer to the abx500_chargalg structure
290 * This function gets called when a charge state change should occur
292 static void abx500_chargalg_state_to(struct abx500_chargalg
*di
,
293 enum abx500_chargalg_states state
)
296 "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
297 di
->charge_state
== state
? "NO" : "YES",
299 states
[di
->charge_state
],
303 di
->charge_state
= state
;
307 * abx500_chargalg_check_charger_connection() - Check charger connection change
308 * @di: pointer to the abx500_chargalg structure
310 * This function will check if there is a change in the charger connection
311 * and change charge state accordingly. AC has precedence over USB.
313 static int abx500_chargalg_check_charger_connection(struct abx500_chargalg
*di
)
315 if (di
->chg_info
.conn_chg
!= di
->chg_info
.prev_conn_chg
||
316 di
->susp_status
.suspended_change
) {
318 * Charger state changed or suspension
319 * has changed since last update
321 if ((di
->chg_info
.conn_chg
& AC_CHG
) &&
322 !di
->susp_status
.ac_suspended
) {
323 dev_dbg(di
->dev
, "Charging source is AC\n");
324 if (di
->chg_info
.charger_type
!= AC_CHG
) {
325 di
->chg_info
.charger_type
= AC_CHG
;
326 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
328 } else if ((di
->chg_info
.conn_chg
& USB_CHG
) &&
329 !di
->susp_status
.usb_suspended
) {
330 dev_dbg(di
->dev
, "Charging source is USB\n");
331 di
->chg_info
.charger_type
= USB_CHG
;
332 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
333 } else if (di
->chg_info
.conn_chg
&&
334 (di
->susp_status
.ac_suspended
||
335 di
->susp_status
.usb_suspended
)) {
336 dev_dbg(di
->dev
, "Charging is suspended\n");
337 di
->chg_info
.charger_type
= NO_CHG
;
338 abx500_chargalg_state_to(di
, STATE_SUSPENDED_INIT
);
340 dev_dbg(di
->dev
, "Charging source is OFF\n");
341 di
->chg_info
.charger_type
= NO_CHG
;
342 abx500_chargalg_state_to(di
, STATE_HANDHELD_INIT
);
344 di
->chg_info
.prev_conn_chg
= di
->chg_info
.conn_chg
;
345 di
->susp_status
.suspended_change
= false;
347 return di
->chg_info
.conn_chg
;
351 * abx500_chargalg_start_safety_timer() - Start charging safety timer
352 * @di: pointer to the abx500_chargalg structure
354 * The safety timer is used to avoid overcharging of old or bad batteries.
355 * There are different timers for AC and USB
357 static void abx500_chargalg_start_safety_timer(struct abx500_chargalg
*di
)
359 unsigned long timer_expiration
= 0;
361 switch (di
->chg_info
.charger_type
) {
364 round_jiffies(jiffies
+
365 (di
->bm
->main_safety_tmr_h
* 3600 * HZ
));
370 round_jiffies(jiffies
+
371 (di
->bm
->usb_safety_tmr_h
* 3600 * HZ
));
375 dev_err(di
->dev
, "Unknown charger to charge from\n");
379 di
->events
.safety_timer_expired
= false;
380 di
->safety_timer
.expires
= timer_expiration
;
381 if (!timer_pending(&di
->safety_timer
))
382 add_timer(&di
->safety_timer
);
384 mod_timer(&di
->safety_timer
, timer_expiration
);
388 * abx500_chargalg_stop_safety_timer() - Stop charging safety timer
389 * @di: pointer to the abx500_chargalg structure
391 * The safety timer is stopped whenever the NORMAL state is exited
393 static void abx500_chargalg_stop_safety_timer(struct abx500_chargalg
*di
)
395 di
->events
.safety_timer_expired
= false;
396 del_timer(&di
->safety_timer
);
400 * abx500_chargalg_start_maintenance_timer() - Start charging maintenance timer
401 * @di: pointer to the abx500_chargalg structure
402 * @duration: duration of ther maintenance timer in hours
404 * The maintenance timer is used to maintain the charge in the battery once
405 * the battery is considered full. These timers are chosen to match the
406 * discharge curve of the battery
408 static void abx500_chargalg_start_maintenance_timer(struct abx500_chargalg
*di
,
411 unsigned long timer_expiration
;
413 /* Convert from hours to jiffies */
414 timer_expiration
= round_jiffies(jiffies
+ (duration
* 3600 * HZ
));
416 di
->events
.maintenance_timer_expired
= false;
417 di
->maintenance_timer
.expires
= timer_expiration
;
418 if (!timer_pending(&di
->maintenance_timer
))
419 add_timer(&di
->maintenance_timer
);
421 mod_timer(&di
->maintenance_timer
, timer_expiration
);
425 * abx500_chargalg_stop_maintenance_timer() - Stop maintenance timer
426 * @di: pointer to the abx500_chargalg structure
428 * The maintenance timer is stopped whenever maintenance ends or when another
431 static void abx500_chargalg_stop_maintenance_timer(struct abx500_chargalg
*di
)
433 di
->events
.maintenance_timer_expired
= false;
434 del_timer(&di
->maintenance_timer
);
438 * abx500_chargalg_kick_watchdog() - Kick charger watchdog
439 * @di: pointer to the abx500_chargalg structure
441 * The charger watchdog have to be kicked periodically whenever the charger is
442 * on, else the ABB will reset the system
444 static int abx500_chargalg_kick_watchdog(struct abx500_chargalg
*di
)
446 /* Check if charger exists and kick watchdog if charging */
447 if (di
->ac_chg
&& di
->ac_chg
->ops
.kick_wd
&&
448 di
->chg_info
.online_chg
& AC_CHG
) {
450 * If AB charger watchdog expired, pm2xxx charging
451 * gets disabled. To be safe, kick both AB charger watchdog
452 * and pm2xxx watchdog.
454 if (di
->ac_chg
->external
&&
455 di
->usb_chg
&& di
->usb_chg
->ops
.kick_wd
)
456 di
->usb_chg
->ops
.kick_wd(di
->usb_chg
);
458 return di
->ac_chg
->ops
.kick_wd(di
->ac_chg
);
460 else if (di
->usb_chg
&& di
->usb_chg
->ops
.kick_wd
&&
461 di
->chg_info
.online_chg
& USB_CHG
)
462 return di
->usb_chg
->ops
.kick_wd(di
->usb_chg
);
468 * abx500_chargalg_ac_en() - Turn on/off the AC charger
469 * @di: pointer to the abx500_chargalg structure
470 * @enable: charger on/off
471 * @vset: requested charger output voltage
472 * @iset: requested charger output current
474 * The AC charger will be turned on/off with the requested charge voltage and
477 static int abx500_chargalg_ac_en(struct abx500_chargalg
*di
, int enable
,
480 if (!di
->ac_chg
|| !di
->ac_chg
->ops
.enable
)
483 /* Select maximum of what both the charger and the battery supports */
484 if (di
->ac_chg
->max_out_volt
)
485 vset
= min(vset
, di
->ac_chg
->max_out_volt
);
486 if (di
->ac_chg
->max_out_curr
)
487 iset
= min(iset
, di
->ac_chg
->max_out_curr
);
489 di
->chg_info
.ac_iset
= iset
;
490 di
->chg_info
.ac_vset
= vset
;
492 return di
->ac_chg
->ops
.enable(di
->ac_chg
, enable
, vset
, iset
);
496 * abx500_chargalg_usb_en() - Turn on/off the USB charger
497 * @di: pointer to the abx500_chargalg structure
498 * @enable: charger on/off
499 * @vset: requested charger output voltage
500 * @iset: requested charger output current
502 * The USB charger will be turned on/off with the requested charge voltage and
505 static int abx500_chargalg_usb_en(struct abx500_chargalg
*di
, int enable
,
508 if (!di
->usb_chg
|| !di
->usb_chg
->ops
.enable
)
511 /* Select maximum of what both the charger and the battery supports */
512 if (di
->usb_chg
->max_out_volt
)
513 vset
= min(vset
, di
->usb_chg
->max_out_volt
);
514 if (di
->usb_chg
->max_out_curr
)
515 iset
= min(iset
, di
->usb_chg
->max_out_curr
);
517 di
->chg_info
.usb_iset
= iset
;
518 di
->chg_info
.usb_vset
= vset
;
520 return di
->usb_chg
->ops
.enable(di
->usb_chg
, enable
, vset
, iset
);
524 * abx500_chargalg_update_chg_curr() - Update charger current
525 * @di: pointer to the abx500_chargalg structure
526 * @iset: requested charger output current
528 * The charger output current will be updated for the charger
529 * that is currently in use
531 static int abx500_chargalg_update_chg_curr(struct abx500_chargalg
*di
,
534 /* Check if charger exists and update current if charging */
535 if (di
->ac_chg
&& di
->ac_chg
->ops
.update_curr
&&
536 di
->chg_info
.charger_type
& AC_CHG
) {
538 * Select maximum of what both the charger
539 * and the battery supports
541 if (di
->ac_chg
->max_out_curr
)
542 iset
= min(iset
, di
->ac_chg
->max_out_curr
);
544 di
->chg_info
.ac_iset
= iset
;
546 return di
->ac_chg
->ops
.update_curr(di
->ac_chg
, iset
);
547 } else if (di
->usb_chg
&& di
->usb_chg
->ops
.update_curr
&&
548 di
->chg_info
.charger_type
& USB_CHG
) {
550 * Select maximum of what both the charger
551 * and the battery supports
553 if (di
->usb_chg
->max_out_curr
)
554 iset
= min(iset
, di
->usb_chg
->max_out_curr
);
556 di
->chg_info
.usb_iset
= iset
;
558 return di
->usb_chg
->ops
.update_curr(di
->usb_chg
, iset
);
565 * abx500_chargalg_stop_charging() - Stop charging
566 * @di: pointer to the abx500_chargalg structure
568 * This function is called from any state where charging should be stopped.
569 * All charging is disabled and all status parameters and timers are changed
572 static void abx500_chargalg_stop_charging(struct abx500_chargalg
*di
)
574 abx500_chargalg_ac_en(di
, false, 0, 0);
575 abx500_chargalg_usb_en(di
, false, 0, 0);
576 abx500_chargalg_stop_safety_timer(di
);
577 abx500_chargalg_stop_maintenance_timer(di
);
578 di
->charge_status
= POWER_SUPPLY_STATUS_NOT_CHARGING
;
579 di
->maintenance_chg
= false;
580 cancel_delayed_work(&di
->chargalg_wd_work
);
581 power_supply_changed(&di
->chargalg_psy
);
585 * abx500_chargalg_hold_charging() - Pauses charging
586 * @di: pointer to the abx500_chargalg structure
588 * This function is called in the case where maintenance charging has been
589 * disabled and instead a battery voltage mode is entered to check when the
590 * battery voltage has reached a certain recharge voltage
592 static void abx500_chargalg_hold_charging(struct abx500_chargalg
*di
)
594 abx500_chargalg_ac_en(di
, false, 0, 0);
595 abx500_chargalg_usb_en(di
, false, 0, 0);
596 abx500_chargalg_stop_safety_timer(di
);
597 abx500_chargalg_stop_maintenance_timer(di
);
598 di
->charge_status
= POWER_SUPPLY_STATUS_CHARGING
;
599 di
->maintenance_chg
= false;
600 cancel_delayed_work(&di
->chargalg_wd_work
);
601 power_supply_changed(&di
->chargalg_psy
);
605 * abx500_chargalg_start_charging() - Start the charger
606 * @di: pointer to the abx500_chargalg structure
607 * @vset: requested charger output voltage
608 * @iset: requested charger output current
610 * A charger will be enabled depending on the requested charger type that was
611 * detected previously.
613 static void abx500_chargalg_start_charging(struct abx500_chargalg
*di
,
616 bool start_chargalg_wd
= true;
618 switch (di
->chg_info
.charger_type
) {
621 "AC parameters: Vset %d, Ich %d\n", vset
, iset
);
622 abx500_chargalg_usb_en(di
, false, 0, 0);
623 abx500_chargalg_ac_en(di
, true, vset
, iset
);
628 "USB parameters: Vset %d, Ich %d\n", vset
, iset
);
629 abx500_chargalg_ac_en(di
, false, 0, 0);
630 abx500_chargalg_usb_en(di
, true, vset
, iset
);
634 dev_err(di
->dev
, "Unknown charger to charge from\n");
635 start_chargalg_wd
= false;
639 if (start_chargalg_wd
&& !delayed_work_pending(&di
->chargalg_wd_work
))
640 queue_delayed_work(di
->chargalg_wq
, &di
->chargalg_wd_work
, 0);
644 * abx500_chargalg_check_temp() - Check battery temperature ranges
645 * @di: pointer to the abx500_chargalg structure
647 * The battery temperature is checked against the predefined limits and the
648 * charge state is changed accordingly
650 static void abx500_chargalg_check_temp(struct abx500_chargalg
*di
)
652 if (di
->batt_data
.temp
> (di
->bm
->temp_low
+ di
->t_hyst_norm
) &&
653 di
->batt_data
.temp
< (di
->bm
->temp_high
- di
->t_hyst_norm
)) {
655 di
->events
.btemp_underover
= false;
656 di
->events
.btemp_lowhigh
= false;
658 di
->t_hyst_lowhigh
= 0;
660 if (((di
->batt_data
.temp
>= di
->bm
->temp_high
) &&
661 (di
->batt_data
.temp
<
662 (di
->bm
->temp_over
- di
->t_hyst_lowhigh
))) ||
663 ((di
->batt_data
.temp
>
664 (di
->bm
->temp_under
+ di
->t_hyst_lowhigh
)) &&
665 (di
->batt_data
.temp
<= di
->bm
->temp_low
))) {
666 /* TEMP minor!!!!! */
667 di
->events
.btemp_underover
= false;
668 di
->events
.btemp_lowhigh
= true;
669 di
->t_hyst_norm
= di
->bm
->temp_hysteresis
;
670 di
->t_hyst_lowhigh
= 0;
671 } else if (di
->batt_data
.temp
<= di
->bm
->temp_under
||
672 di
->batt_data
.temp
>= di
->bm
->temp_over
) {
673 /* TEMP major!!!!! */
674 di
->events
.btemp_underover
= true;
675 di
->events
.btemp_lowhigh
= false;
677 di
->t_hyst_lowhigh
= di
->bm
->temp_hysteresis
;
679 /* Within hysteresis */
680 dev_dbg(di
->dev
, "Within hysteresis limit temp: %d "
681 "hyst_lowhigh %d, hyst normal %d\n",
682 di
->batt_data
.temp
, di
->t_hyst_lowhigh
,
689 * abx500_chargalg_check_charger_voltage() - Check charger voltage
690 * @di: pointer to the abx500_chargalg structure
692 * Charger voltage is checked against maximum limit
694 static void abx500_chargalg_check_charger_voltage(struct abx500_chargalg
*di
)
696 if (di
->chg_info
.usb_volt
> di
->bm
->chg_params
->usb_volt_max
)
697 di
->chg_info
.usb_chg_ok
= false;
699 di
->chg_info
.usb_chg_ok
= true;
701 if (di
->chg_info
.ac_volt
> di
->bm
->chg_params
->ac_volt_max
)
702 di
->chg_info
.ac_chg_ok
= false;
704 di
->chg_info
.ac_chg_ok
= true;
709 * abx500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
710 * @di: pointer to the abx500_chargalg structure
712 * End-of-charge criteria is fulfilled when the battery voltage is above a
713 * certain limit and the battery current is below a certain limit for a
714 * predefined number of consecutive seconds. If true, the battery is full
716 static void abx500_chargalg_end_of_charge(struct abx500_chargalg
*di
)
718 if (di
->charge_status
== POWER_SUPPLY_STATUS_CHARGING
&&
719 di
->charge_state
== STATE_NORMAL
&&
720 !di
->maintenance_chg
&& (di
->batt_data
.volt
>=
721 di
->bm
->bat_type
[di
->bm
->batt_id
].termination_vol
||
722 di
->events
.usb_cv_active
|| di
->events
.ac_cv_active
) &&
723 di
->batt_data
.avg_curr
<
724 di
->bm
->bat_type
[di
->bm
->batt_id
].termination_curr
&&
725 di
->batt_data
.avg_curr
> 0) {
726 if (++di
->eoc_cnt
>= EOC_COND_CNT
) {
728 di
->charge_status
= POWER_SUPPLY_STATUS_FULL
;
729 di
->maintenance_chg
= true;
730 dev_dbg(di
->dev
, "EOC reached!\n");
731 power_supply_changed(&di
->chargalg_psy
);
734 " EOC limit reached for the %d"
735 " time, out of %d before EOC\n",
744 static void init_maxim_chg_curr(struct abx500_chargalg
*di
)
746 di
->ccm
.original_iset
=
747 di
->bm
->bat_type
[di
->bm
->batt_id
].normal_cur_lvl
;
748 di
->ccm
.current_iset
=
749 di
->bm
->bat_type
[di
->bm
->batt_id
].normal_cur_lvl
;
750 di
->ccm
.test_delta_i
= di
->bm
->maxi
->charger_curr_step
;
751 di
->ccm
.max_current
= di
->bm
->maxi
->chg_curr
;
752 di
->ccm
.condition_cnt
= di
->bm
->maxi
->wait_cycles
;
757 * abx500_chargalg_chg_curr_maxim - increases the charger current to
758 * compensate for the system load
759 * @di pointer to the abx500_chargalg structure
761 * This maximization function is used to raise the charger current to get the
762 * battery current as close to the optimal value as possible. The battery
763 * current during charging is affected by the system load
765 static enum maxim_ret
abx500_chargalg_chg_curr_maxim(struct abx500_chargalg
*di
)
769 if (!di
->bm
->maxi
->ena_maxi
)
770 return MAXIM_RET_NOACTION
;
772 delta_i
= di
->ccm
.original_iset
- di
->batt_data
.inst_curr
;
774 if (di
->events
.vbus_collapsed
) {
775 dev_dbg(di
->dev
, "Charger voltage has collapsed %d\n",
777 if (di
->ccm
.wait_cnt
== 0) {
778 dev_dbg(di
->dev
, "lowering current\n");
780 di
->ccm
.condition_cnt
= di
->bm
->maxi
->wait_cycles
;
781 di
->ccm
.max_current
=
782 di
->ccm
.current_iset
- di
->ccm
.test_delta_i
;
783 di
->ccm
.current_iset
= di
->ccm
.max_current
;
785 return MAXIM_RET_CHANGE
;
787 dev_dbg(di
->dev
, "waiting\n");
788 /* Let's go in here twice before lowering curr again */
789 di
->ccm
.wait_cnt
= (di
->ccm
.wait_cnt
+ 1) % 3;
790 return MAXIM_RET_NOACTION
;
794 di
->ccm
.wait_cnt
= 0;
796 if ((di
->batt_data
.inst_curr
> di
->ccm
.original_iset
)) {
797 dev_dbg(di
->dev
, " Maximization Ibat (%dmA) too high"
798 " (limit %dmA) (current iset: %dmA)!\n",
799 di
->batt_data
.inst_curr
, di
->ccm
.original_iset
,
800 di
->ccm
.current_iset
);
802 if (di
->ccm
.current_iset
== di
->ccm
.original_iset
)
803 return MAXIM_RET_NOACTION
;
805 di
->ccm
.condition_cnt
= di
->bm
->maxi
->wait_cycles
;
806 di
->ccm
.current_iset
= di
->ccm
.original_iset
;
809 return MAXIM_RET_IBAT_TOO_HIGH
;
812 if (delta_i
> di
->ccm
.test_delta_i
&&
813 (di
->ccm
.current_iset
+ di
->ccm
.test_delta_i
) <
814 di
->ccm
.max_current
) {
815 if (di
->ccm
.condition_cnt
-- == 0) {
816 /* Increse the iset with cco.test_delta_i */
817 di
->ccm
.condition_cnt
= di
->bm
->maxi
->wait_cycles
;
818 di
->ccm
.current_iset
+= di
->ccm
.test_delta_i
;
820 dev_dbg(di
->dev
, " Maximization needed, increase"
821 " with %d mA to %dmA (Optimal ibat: %d)"
823 di
->ccm
.test_delta_i
,
824 di
->ccm
.current_iset
,
825 di
->ccm
.original_iset
,
827 return MAXIM_RET_CHANGE
;
829 return MAXIM_RET_NOACTION
;
832 di
->ccm
.condition_cnt
= di
->bm
->maxi
->wait_cycles
;
833 return MAXIM_RET_NOACTION
;
837 static void handle_maxim_chg_curr(struct abx500_chargalg
*di
)
842 ret
= abx500_chargalg_chg_curr_maxim(di
);
844 case MAXIM_RET_CHANGE
:
845 result
= abx500_chargalg_update_chg_curr(di
,
846 di
->ccm
.current_iset
);
848 dev_err(di
->dev
, "failed to set chg curr\n");
850 case MAXIM_RET_IBAT_TOO_HIGH
:
851 result
= abx500_chargalg_update_chg_curr(di
,
852 di
->bm
->bat_type
[di
->bm
->batt_id
].normal_cur_lvl
);
854 dev_err(di
->dev
, "failed to set chg curr\n");
857 case MAXIM_RET_NOACTION
:
864 static int abx500_chargalg_get_ext_psy_data(struct device
*dev
, void *data
)
866 struct power_supply
*psy
;
867 struct power_supply
*ext
;
868 struct abx500_chargalg
*di
;
869 union power_supply_propval ret
;
871 bool psy_found
= false;
872 bool capacity_updated
= false;
874 psy
= (struct power_supply
*)data
;
875 ext
= dev_get_drvdata(dev
);
876 di
= to_abx500_chargalg_device_info(psy
);
877 /* For all psy where the driver name appears in any supplied_to */
878 for (i
= 0; i
< ext
->num_supplicants
; i
++) {
879 if (!strcmp(ext
->supplied_to
[i
], psy
->name
))
886 * If external is not registering 'POWER_SUPPLY_PROP_CAPACITY' to its
887 * property because of handling that sysfs entry on its own, this is
888 * the place to get the battery capacity.
890 if (!ext
->get_property(ext
, POWER_SUPPLY_PROP_CAPACITY
, &ret
)) {
891 di
->batt_data
.percent
= ret
.intval
;
892 capacity_updated
= true;
895 /* Go through all properties for the psy */
896 for (j
= 0; j
< ext
->num_properties
; j
++) {
897 enum power_supply_property prop
;
898 prop
= ext
->properties
[j
];
900 /* Initialize chargers if not already done */
902 ext
->type
== POWER_SUPPLY_TYPE_MAINS
)
903 di
->ac_chg
= psy_to_ux500_charger(ext
);
904 else if (!di
->usb_chg
&&
905 ext
->type
== POWER_SUPPLY_TYPE_USB
)
906 di
->usb_chg
= psy_to_ux500_charger(ext
);
908 if (ext
->get_property(ext
, prop
, &ret
))
911 case POWER_SUPPLY_PROP_PRESENT
:
913 case POWER_SUPPLY_TYPE_BATTERY
:
914 /* Battery present */
916 di
->events
.batt_rem
= false;
917 /* Battery removed */
919 di
->events
.batt_rem
= true;
921 case POWER_SUPPLY_TYPE_MAINS
:
922 /* AC disconnected */
924 (di
->chg_info
.conn_chg
& AC_CHG
)) {
925 di
->chg_info
.prev_conn_chg
=
926 di
->chg_info
.conn_chg
;
927 di
->chg_info
.conn_chg
&= ~AC_CHG
;
930 else if (ret
.intval
&&
931 !(di
->chg_info
.conn_chg
& AC_CHG
)) {
932 di
->chg_info
.prev_conn_chg
=
933 di
->chg_info
.conn_chg
;
934 di
->chg_info
.conn_chg
|= AC_CHG
;
937 case POWER_SUPPLY_TYPE_USB
:
938 /* USB disconnected */
940 (di
->chg_info
.conn_chg
& USB_CHG
)) {
941 di
->chg_info
.prev_conn_chg
=
942 di
->chg_info
.conn_chg
;
943 di
->chg_info
.conn_chg
&= ~USB_CHG
;
946 else if (ret
.intval
&&
947 !(di
->chg_info
.conn_chg
& USB_CHG
)) {
948 di
->chg_info
.prev_conn_chg
=
949 di
->chg_info
.conn_chg
;
950 di
->chg_info
.conn_chg
|= USB_CHG
;
958 case POWER_SUPPLY_PROP_ONLINE
:
960 case POWER_SUPPLY_TYPE_BATTERY
:
962 case POWER_SUPPLY_TYPE_MAINS
:
965 (di
->chg_info
.online_chg
& AC_CHG
)) {
966 di
->chg_info
.prev_online_chg
=
967 di
->chg_info
.online_chg
;
968 di
->chg_info
.online_chg
&= ~AC_CHG
;
971 else if (ret
.intval
&&
972 !(di
->chg_info
.online_chg
& AC_CHG
)) {
973 di
->chg_info
.prev_online_chg
=
974 di
->chg_info
.online_chg
;
975 di
->chg_info
.online_chg
|= AC_CHG
;
976 queue_delayed_work(di
->chargalg_wq
,
977 &di
->chargalg_wd_work
, 0);
980 case POWER_SUPPLY_TYPE_USB
:
983 (di
->chg_info
.online_chg
& USB_CHG
)) {
984 di
->chg_info
.prev_online_chg
=
985 di
->chg_info
.online_chg
;
986 di
->chg_info
.online_chg
&= ~USB_CHG
;
989 else if (ret
.intval
&&
990 !(di
->chg_info
.online_chg
& USB_CHG
)) {
991 di
->chg_info
.prev_online_chg
=
992 di
->chg_info
.online_chg
;
993 di
->chg_info
.online_chg
|= USB_CHG
;
994 queue_delayed_work(di
->chargalg_wq
,
995 &di
->chargalg_wd_work
, 0);
1003 case POWER_SUPPLY_PROP_HEALTH
:
1004 switch (ext
->type
) {
1005 case POWER_SUPPLY_TYPE_BATTERY
:
1007 case POWER_SUPPLY_TYPE_MAINS
:
1008 switch (ret
.intval
) {
1009 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE
:
1010 di
->events
.mainextchnotok
= true;
1011 di
->events
.main_thermal_prot
= false;
1012 di
->events
.main_ovv
= false;
1013 di
->events
.ac_wd_expired
= false;
1015 case POWER_SUPPLY_HEALTH_DEAD
:
1016 di
->events
.ac_wd_expired
= true;
1017 di
->events
.mainextchnotok
= false;
1018 di
->events
.main_ovv
= false;
1019 di
->events
.main_thermal_prot
= false;
1021 case POWER_SUPPLY_HEALTH_COLD
:
1022 case POWER_SUPPLY_HEALTH_OVERHEAT
:
1023 di
->events
.main_thermal_prot
= true;
1024 di
->events
.mainextchnotok
= false;
1025 di
->events
.main_ovv
= false;
1026 di
->events
.ac_wd_expired
= false;
1028 case POWER_SUPPLY_HEALTH_OVERVOLTAGE
:
1029 di
->events
.main_ovv
= true;
1030 di
->events
.mainextchnotok
= false;
1031 di
->events
.main_thermal_prot
= false;
1032 di
->events
.ac_wd_expired
= false;
1034 case POWER_SUPPLY_HEALTH_GOOD
:
1035 di
->events
.main_thermal_prot
= false;
1036 di
->events
.mainextchnotok
= false;
1037 di
->events
.main_ovv
= false;
1038 di
->events
.ac_wd_expired
= false;
1045 case POWER_SUPPLY_TYPE_USB
:
1046 switch (ret
.intval
) {
1047 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE
:
1048 di
->events
.usbchargernotok
= true;
1049 di
->events
.usb_thermal_prot
= false;
1050 di
->events
.vbus_ovv
= false;
1051 di
->events
.usb_wd_expired
= false;
1053 case POWER_SUPPLY_HEALTH_DEAD
:
1054 di
->events
.usb_wd_expired
= true;
1055 di
->events
.usbchargernotok
= false;
1056 di
->events
.usb_thermal_prot
= false;
1057 di
->events
.vbus_ovv
= false;
1059 case POWER_SUPPLY_HEALTH_COLD
:
1060 case POWER_SUPPLY_HEALTH_OVERHEAT
:
1061 di
->events
.usb_thermal_prot
= true;
1062 di
->events
.usbchargernotok
= false;
1063 di
->events
.vbus_ovv
= false;
1064 di
->events
.usb_wd_expired
= false;
1066 case POWER_SUPPLY_HEALTH_OVERVOLTAGE
:
1067 di
->events
.vbus_ovv
= true;
1068 di
->events
.usbchargernotok
= false;
1069 di
->events
.usb_thermal_prot
= false;
1070 di
->events
.usb_wd_expired
= false;
1072 case POWER_SUPPLY_HEALTH_GOOD
:
1073 di
->events
.usbchargernotok
= false;
1074 di
->events
.usb_thermal_prot
= false;
1075 di
->events
.vbus_ovv
= false;
1076 di
->events
.usb_wd_expired
= false;
1086 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
1087 switch (ext
->type
) {
1088 case POWER_SUPPLY_TYPE_BATTERY
:
1089 di
->batt_data
.volt
= ret
.intval
/ 1000;
1091 case POWER_SUPPLY_TYPE_MAINS
:
1092 di
->chg_info
.ac_volt
= ret
.intval
/ 1000;
1094 case POWER_SUPPLY_TYPE_USB
:
1095 di
->chg_info
.usb_volt
= ret
.intval
/ 1000;
1102 case POWER_SUPPLY_PROP_VOLTAGE_AVG
:
1103 switch (ext
->type
) {
1104 case POWER_SUPPLY_TYPE_MAINS
:
1105 /* AVG is used to indicate when we are
1108 di
->events
.ac_cv_active
= true;
1110 di
->events
.ac_cv_active
= false;
1113 case POWER_SUPPLY_TYPE_USB
:
1114 /* AVG is used to indicate when we are
1117 di
->events
.usb_cv_active
= true;
1119 di
->events
.usb_cv_active
= false;
1127 case POWER_SUPPLY_PROP_TECHNOLOGY
:
1128 switch (ext
->type
) {
1129 case POWER_SUPPLY_TYPE_BATTERY
:
1131 di
->events
.batt_unknown
= false;
1133 di
->events
.batt_unknown
= true;
1141 case POWER_SUPPLY_PROP_TEMP
:
1142 di
->batt_data
.temp
= ret
.intval
/ 10;
1145 case POWER_SUPPLY_PROP_CURRENT_NOW
:
1146 switch (ext
->type
) {
1147 case POWER_SUPPLY_TYPE_MAINS
:
1148 di
->chg_info
.ac_curr
=
1151 case POWER_SUPPLY_TYPE_USB
:
1152 di
->chg_info
.usb_curr
=
1155 case POWER_SUPPLY_TYPE_BATTERY
:
1156 di
->batt_data
.inst_curr
= ret
.intval
/ 1000;
1163 case POWER_SUPPLY_PROP_CURRENT_AVG
:
1164 switch (ext
->type
) {
1165 case POWER_SUPPLY_TYPE_BATTERY
:
1166 di
->batt_data
.avg_curr
= ret
.intval
/ 1000;
1168 case POWER_SUPPLY_TYPE_USB
:
1170 di
->events
.vbus_collapsed
= true;
1172 di
->events
.vbus_collapsed
= false;
1178 case POWER_SUPPLY_PROP_CAPACITY
:
1179 if (!capacity_updated
)
1180 di
->batt_data
.percent
= ret
.intval
;
1190 * abx500_chargalg_external_power_changed() - callback for power supply changes
1191 * @psy: pointer to the structure power_supply
1193 * This function is the entry point of the pointer external_power_changed
1194 * of the structure power_supply.
1195 * This function gets executed when there is a change in any external power
1196 * supply that this driver needs to be notified of.
1198 static void abx500_chargalg_external_power_changed(struct power_supply
*psy
)
1200 struct abx500_chargalg
*di
= to_abx500_chargalg_device_info(psy
);
1203 * Trigger execution of the algorithm instantly and read
1204 * all power_supply properties there instead
1206 queue_work(di
->chargalg_wq
, &di
->chargalg_work
);
1210 * abx500_chargalg_algorithm() - Main function for the algorithm
1211 * @di: pointer to the abx500_chargalg structure
1213 * This is the main control function for the charging algorithm.
1214 * It is called periodically or when something happens that will
1215 * trigger a state change
1217 static void abx500_chargalg_algorithm(struct abx500_chargalg
*di
)
1221 /* Collect data from all power_supply class devices */
1222 class_for_each_device(power_supply_class
, NULL
,
1223 &di
->chargalg_psy
, abx500_chargalg_get_ext_psy_data
);
1225 abx500_chargalg_end_of_charge(di
);
1226 abx500_chargalg_check_temp(di
);
1227 abx500_chargalg_check_charger_voltage(di
);
1229 charger_status
= abx500_chargalg_check_charger_connection(di
);
1231 * First check if we have a charger connected.
1232 * Also we don't allow charging of unknown batteries if configured
1235 if (!charger_status
||
1236 (di
->events
.batt_unknown
&& !di
->bm
->chg_unknown_bat
)) {
1237 if (di
->charge_state
!= STATE_HANDHELD
) {
1238 di
->events
.safety_timer_expired
= false;
1239 abx500_chargalg_state_to(di
, STATE_HANDHELD_INIT
);
1243 /* If suspended, we should not continue checking the flags */
1244 else if (di
->charge_state
== STATE_SUSPENDED_INIT
||
1245 di
->charge_state
== STATE_SUSPENDED
) {
1246 /* We don't do anything here, just don,t continue */
1249 /* Safety timer expiration */
1250 else if (di
->events
.safety_timer_expired
) {
1251 if (di
->charge_state
!= STATE_SAFETY_TIMER_EXPIRED
)
1252 abx500_chargalg_state_to(di
,
1253 STATE_SAFETY_TIMER_EXPIRED_INIT
);
1256 * Check if any interrupts has occured
1257 * that will prevent us from charging
1260 /* Battery removed */
1261 else if (di
->events
.batt_rem
) {
1262 if (di
->charge_state
!= STATE_BATT_REMOVED
)
1263 abx500_chargalg_state_to(di
, STATE_BATT_REMOVED_INIT
);
1265 /* Main or USB charger not ok. */
1266 else if (di
->events
.mainextchnotok
|| di
->events
.usbchargernotok
) {
1268 * If vbus_collapsed is set, we have to lower the charger
1269 * current, which is done in the normal state below
1271 if (di
->charge_state
!= STATE_CHG_NOT_OK
&&
1272 !di
->events
.vbus_collapsed
)
1273 abx500_chargalg_state_to(di
, STATE_CHG_NOT_OK_INIT
);
1275 /* VBUS, Main or VBAT OVV. */
1276 else if (di
->events
.vbus_ovv
||
1277 di
->events
.main_ovv
||
1278 di
->events
.batt_ovv
||
1279 !di
->chg_info
.usb_chg_ok
||
1280 !di
->chg_info
.ac_chg_ok
) {
1281 if (di
->charge_state
!= STATE_OVV_PROTECT
)
1282 abx500_chargalg_state_to(di
, STATE_OVV_PROTECT_INIT
);
1284 /* USB Thermal, stop charging */
1285 else if (di
->events
.main_thermal_prot
||
1286 di
->events
.usb_thermal_prot
) {
1287 if (di
->charge_state
!= STATE_HW_TEMP_PROTECT
)
1288 abx500_chargalg_state_to(di
,
1289 STATE_HW_TEMP_PROTECT_INIT
);
1291 /* Battery temp over/under */
1292 else if (di
->events
.btemp_underover
) {
1293 if (di
->charge_state
!= STATE_TEMP_UNDEROVER
)
1294 abx500_chargalg_state_to(di
,
1295 STATE_TEMP_UNDEROVER_INIT
);
1297 /* Watchdog expired */
1298 else if (di
->events
.ac_wd_expired
||
1299 di
->events
.usb_wd_expired
) {
1300 if (di
->charge_state
!= STATE_WD_EXPIRED
)
1301 abx500_chargalg_state_to(di
, STATE_WD_EXPIRED_INIT
);
1303 /* Battery temp high/low */
1304 else if (di
->events
.btemp_lowhigh
) {
1305 if (di
->charge_state
!= STATE_TEMP_LOWHIGH
)
1306 abx500_chargalg_state_to(di
, STATE_TEMP_LOWHIGH_INIT
);
1310 "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
1311 "State %s Active_chg %d Chg_status %d AC %d USB %d "
1312 "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
1313 "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
1315 di
->batt_data
.avg_curr
,
1316 di
->batt_data
.inst_curr
,
1318 di
->batt_data
.percent
,
1319 di
->maintenance_chg
,
1320 states
[di
->charge_state
],
1321 di
->chg_info
.charger_type
,
1323 di
->chg_info
.conn_chg
& AC_CHG
,
1324 di
->chg_info
.conn_chg
& USB_CHG
,
1325 di
->chg_info
.online_chg
& AC_CHG
,
1326 di
->chg_info
.online_chg
& USB_CHG
,
1327 di
->events
.ac_cv_active
,
1328 di
->events
.usb_cv_active
,
1329 di
->chg_info
.ac_curr
,
1330 di
->chg_info
.usb_curr
,
1331 di
->chg_info
.ac_vset
,
1332 di
->chg_info
.ac_iset
,
1333 di
->chg_info
.usb_vset
,
1334 di
->chg_info
.usb_iset
);
1336 switch (di
->charge_state
) {
1337 case STATE_HANDHELD_INIT
:
1338 abx500_chargalg_stop_charging(di
);
1339 di
->charge_status
= POWER_SUPPLY_STATUS_DISCHARGING
;
1340 abx500_chargalg_state_to(di
, STATE_HANDHELD
);
1341 /* Intentional fallthrough */
1343 case STATE_HANDHELD
:
1346 case STATE_SUSPENDED_INIT
:
1347 if (di
->susp_status
.ac_suspended
)
1348 abx500_chargalg_ac_en(di
, false, 0, 0);
1349 if (di
->susp_status
.usb_suspended
)
1350 abx500_chargalg_usb_en(di
, false, 0, 0);
1351 abx500_chargalg_stop_safety_timer(di
);
1352 abx500_chargalg_stop_maintenance_timer(di
);
1353 di
->charge_status
= POWER_SUPPLY_STATUS_NOT_CHARGING
;
1354 di
->maintenance_chg
= false;
1355 abx500_chargalg_state_to(di
, STATE_SUSPENDED
);
1356 power_supply_changed(&di
->chargalg_psy
);
1357 /* Intentional fallthrough */
1359 case STATE_SUSPENDED
:
1360 /* CHARGING is suspended */
1363 case STATE_BATT_REMOVED_INIT
:
1364 abx500_chargalg_stop_charging(di
);
1365 abx500_chargalg_state_to(di
, STATE_BATT_REMOVED
);
1366 /* Intentional fallthrough */
1368 case STATE_BATT_REMOVED
:
1369 if (!di
->events
.batt_rem
)
1370 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1373 case STATE_HW_TEMP_PROTECT_INIT
:
1374 abx500_chargalg_stop_charging(di
);
1375 abx500_chargalg_state_to(di
, STATE_HW_TEMP_PROTECT
);
1376 /* Intentional fallthrough */
1378 case STATE_HW_TEMP_PROTECT
:
1379 if (!di
->events
.main_thermal_prot
&&
1380 !di
->events
.usb_thermal_prot
)
1381 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1384 case STATE_OVV_PROTECT_INIT
:
1385 abx500_chargalg_stop_charging(di
);
1386 abx500_chargalg_state_to(di
, STATE_OVV_PROTECT
);
1387 /* Intentional fallthrough */
1389 case STATE_OVV_PROTECT
:
1390 if (!di
->events
.vbus_ovv
&&
1391 !di
->events
.main_ovv
&&
1392 !di
->events
.batt_ovv
&&
1393 di
->chg_info
.usb_chg_ok
&&
1394 di
->chg_info
.ac_chg_ok
)
1395 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1398 case STATE_CHG_NOT_OK_INIT
:
1399 abx500_chargalg_stop_charging(di
);
1400 abx500_chargalg_state_to(di
, STATE_CHG_NOT_OK
);
1401 /* Intentional fallthrough */
1403 case STATE_CHG_NOT_OK
:
1404 if (!di
->events
.mainextchnotok
&&
1405 !di
->events
.usbchargernotok
)
1406 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1409 case STATE_SAFETY_TIMER_EXPIRED_INIT
:
1410 abx500_chargalg_stop_charging(di
);
1411 abx500_chargalg_state_to(di
, STATE_SAFETY_TIMER_EXPIRED
);
1412 /* Intentional fallthrough */
1414 case STATE_SAFETY_TIMER_EXPIRED
:
1415 /* We exit this state when charger is removed */
1418 case STATE_NORMAL_INIT
:
1419 abx500_chargalg_start_charging(di
,
1420 di
->bm
->bat_type
[di
->bm
->batt_id
].normal_vol_lvl
,
1421 di
->bm
->bat_type
[di
->bm
->batt_id
].normal_cur_lvl
);
1422 abx500_chargalg_state_to(di
, STATE_NORMAL
);
1423 abx500_chargalg_start_safety_timer(di
);
1424 abx500_chargalg_stop_maintenance_timer(di
);
1425 init_maxim_chg_curr(di
);
1426 di
->charge_status
= POWER_SUPPLY_STATUS_CHARGING
;
1428 di
->maintenance_chg
= false;
1429 power_supply_changed(&di
->chargalg_psy
);
1434 handle_maxim_chg_curr(di
);
1435 if (di
->charge_status
== POWER_SUPPLY_STATUS_FULL
&&
1436 di
->maintenance_chg
) {
1437 if (di
->bm
->no_maintenance
)
1438 abx500_chargalg_state_to(di
,
1439 STATE_WAIT_FOR_RECHARGE_INIT
);
1441 abx500_chargalg_state_to(di
,
1442 STATE_MAINTENANCE_A_INIT
);
1446 /* This state will be used when the maintenance state is disabled */
1447 case STATE_WAIT_FOR_RECHARGE_INIT
:
1448 abx500_chargalg_hold_charging(di
);
1449 abx500_chargalg_state_to(di
, STATE_WAIT_FOR_RECHARGE
);
1450 /* Intentional fallthrough */
1452 case STATE_WAIT_FOR_RECHARGE
:
1453 if (di
->batt_data
.percent
<=
1454 di
->bm
->bat_type
[di
->bm
->batt_id
].
1456 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1459 case STATE_MAINTENANCE_A_INIT
:
1460 abx500_chargalg_stop_safety_timer(di
);
1461 abx500_chargalg_start_maintenance_timer(di
,
1463 di
->bm
->batt_id
].maint_a_chg_timer_h
);
1464 abx500_chargalg_start_charging(di
,
1466 di
->bm
->batt_id
].maint_a_vol_lvl
,
1468 di
->bm
->batt_id
].maint_a_cur_lvl
);
1469 abx500_chargalg_state_to(di
, STATE_MAINTENANCE_A
);
1470 power_supply_changed(&di
->chargalg_psy
);
1471 /* Intentional fallthrough*/
1473 case STATE_MAINTENANCE_A
:
1474 if (di
->events
.maintenance_timer_expired
) {
1475 abx500_chargalg_stop_maintenance_timer(di
);
1476 abx500_chargalg_state_to(di
, STATE_MAINTENANCE_B_INIT
);
1480 case STATE_MAINTENANCE_B_INIT
:
1481 abx500_chargalg_start_maintenance_timer(di
,
1483 di
->bm
->batt_id
].maint_b_chg_timer_h
);
1484 abx500_chargalg_start_charging(di
,
1486 di
->bm
->batt_id
].maint_b_vol_lvl
,
1488 di
->bm
->batt_id
].maint_b_cur_lvl
);
1489 abx500_chargalg_state_to(di
, STATE_MAINTENANCE_B
);
1490 power_supply_changed(&di
->chargalg_psy
);
1491 /* Intentional fallthrough*/
1493 case STATE_MAINTENANCE_B
:
1494 if (di
->events
.maintenance_timer_expired
) {
1495 abx500_chargalg_stop_maintenance_timer(di
);
1496 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1500 case STATE_TEMP_LOWHIGH_INIT
:
1501 abx500_chargalg_start_charging(di
,
1503 di
->bm
->batt_id
].low_high_vol_lvl
,
1505 di
->bm
->batt_id
].low_high_cur_lvl
);
1506 abx500_chargalg_stop_maintenance_timer(di
);
1507 di
->charge_status
= POWER_SUPPLY_STATUS_CHARGING
;
1508 abx500_chargalg_state_to(di
, STATE_TEMP_LOWHIGH
);
1509 power_supply_changed(&di
->chargalg_psy
);
1510 /* Intentional fallthrough */
1512 case STATE_TEMP_LOWHIGH
:
1513 if (!di
->events
.btemp_lowhigh
)
1514 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1517 case STATE_WD_EXPIRED_INIT
:
1518 abx500_chargalg_stop_charging(di
);
1519 abx500_chargalg_state_to(di
, STATE_WD_EXPIRED
);
1520 /* Intentional fallthrough */
1522 case STATE_WD_EXPIRED
:
1523 if (!di
->events
.ac_wd_expired
&&
1524 !di
->events
.usb_wd_expired
)
1525 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1528 case STATE_TEMP_UNDEROVER_INIT
:
1529 abx500_chargalg_stop_charging(di
);
1530 abx500_chargalg_state_to(di
, STATE_TEMP_UNDEROVER
);
1531 /* Intentional fallthrough */
1533 case STATE_TEMP_UNDEROVER
:
1534 if (!di
->events
.btemp_underover
)
1535 abx500_chargalg_state_to(di
, STATE_NORMAL_INIT
);
1539 /* Start charging directly if the new state is a charge state */
1540 if (di
->charge_state
== STATE_NORMAL_INIT
||
1541 di
->charge_state
== STATE_MAINTENANCE_A_INIT
||
1542 di
->charge_state
== STATE_MAINTENANCE_B_INIT
)
1543 queue_work(di
->chargalg_wq
, &di
->chargalg_work
);
1547 * abx500_chargalg_periodic_work() - Periodic work for the algorithm
1548 * @work: pointer to the work_struct structure
1550 * Work queue function for the charging algorithm
1552 static void abx500_chargalg_periodic_work(struct work_struct
*work
)
1554 struct abx500_chargalg
*di
= container_of(work
,
1555 struct abx500_chargalg
, chargalg_periodic_work
.work
);
1557 abx500_chargalg_algorithm(di
);
1560 * If a charger is connected then the battery has to be monitored
1561 * frequently, else the work can be delayed.
1563 if (di
->chg_info
.conn_chg
)
1564 queue_delayed_work(di
->chargalg_wq
,
1565 &di
->chargalg_periodic_work
,
1566 di
->bm
->interval_charging
* HZ
);
1568 queue_delayed_work(di
->chargalg_wq
,
1569 &di
->chargalg_periodic_work
,
1570 di
->bm
->interval_not_charging
* HZ
);
1574 * abx500_chargalg_wd_work() - periodic work to kick the charger watchdog
1575 * @work: pointer to the work_struct structure
1577 * Work queue function for kicking the charger watchdog
1579 static void abx500_chargalg_wd_work(struct work_struct
*work
)
1582 struct abx500_chargalg
*di
= container_of(work
,
1583 struct abx500_chargalg
, chargalg_wd_work
.work
);
1585 dev_dbg(di
->dev
, "abx500_chargalg_wd_work\n");
1587 ret
= abx500_chargalg_kick_watchdog(di
);
1589 dev_err(di
->dev
, "failed to kick watchdog\n");
1591 queue_delayed_work(di
->chargalg_wq
,
1592 &di
->chargalg_wd_work
, CHG_WD_INTERVAL
);
1596 * abx500_chargalg_work() - Work to run the charging algorithm instantly
1597 * @work: pointer to the work_struct structure
1599 * Work queue function for calling the charging algorithm
1601 static void abx500_chargalg_work(struct work_struct
*work
)
1603 struct abx500_chargalg
*di
= container_of(work
,
1604 struct abx500_chargalg
, chargalg_work
);
1606 abx500_chargalg_algorithm(di
);
1610 * abx500_chargalg_get_property() - get the chargalg properties
1611 * @psy: pointer to the power_supply structure
1612 * @psp: pointer to the power_supply_property structure
1613 * @val: pointer to the power_supply_propval union
1615 * This function gets called when an application tries to get the
1616 * chargalg properties by reading the sysfs files.
1617 * status: charging/discharging/full/unknown
1618 * health: health of the battery
1619 * Returns error code in case of failure else 0 on success
1621 static int abx500_chargalg_get_property(struct power_supply
*psy
,
1622 enum power_supply_property psp
,
1623 union power_supply_propval
*val
)
1625 struct abx500_chargalg
*di
;
1627 di
= to_abx500_chargalg_device_info(psy
);
1630 case POWER_SUPPLY_PROP_STATUS
:
1631 val
->intval
= di
->charge_status
;
1633 case POWER_SUPPLY_PROP_HEALTH
:
1634 if (di
->events
.batt_ovv
) {
1635 val
->intval
= POWER_SUPPLY_HEALTH_OVERVOLTAGE
;
1636 } else if (di
->events
.btemp_underover
) {
1637 if (di
->batt_data
.temp
<= di
->bm
->temp_under
)
1638 val
->intval
= POWER_SUPPLY_HEALTH_COLD
;
1640 val
->intval
= POWER_SUPPLY_HEALTH_OVERHEAT
;
1641 } else if (di
->charge_state
== STATE_SAFETY_TIMER_EXPIRED
||
1642 di
->charge_state
== STATE_SAFETY_TIMER_EXPIRED_INIT
) {
1643 val
->intval
= POWER_SUPPLY_HEALTH_UNSPEC_FAILURE
;
1645 val
->intval
= POWER_SUPPLY_HEALTH_GOOD
;
1654 /* Exposure to the sysfs interface */
1657 * abx500_chargalg_sysfs_show() - sysfs show operations
1658 * @kobj: pointer to the struct kobject
1659 * @attr: pointer to the struct attribute
1660 * @buf: buffer that holds the parameter to send to userspace
1662 * Returns a buffer to be displayed in user space
1664 static ssize_t
abx500_chargalg_sysfs_show(struct kobject
*kobj
,
1665 struct attribute
*attr
, char *buf
)
1667 struct abx500_chargalg
*di
= container_of(kobj
,
1668 struct abx500_chargalg
, chargalg_kobject
);
1670 return sprintf(buf
, "%d\n",
1671 di
->susp_status
.ac_suspended
&&
1672 di
->susp_status
.usb_suspended
);
1676 * abx500_chargalg_sysfs_charger() - sysfs store operations
1677 * @kobj: pointer to the struct kobject
1678 * @attr: pointer to the struct attribute
1679 * @buf: buffer that holds the parameter passed from userspace
1680 * @length: length of the parameter passed
1682 * Returns length of the buffer(input taken from user space) on success
1683 * else error code on failure
1684 * The operation to be performed on passing the parameters from the user space.
1686 static ssize_t
abx500_chargalg_sysfs_charger(struct kobject
*kobj
,
1687 struct attribute
*attr
, const char *buf
, size_t length
)
1689 struct abx500_chargalg
*di
= container_of(kobj
,
1690 struct abx500_chargalg
, chargalg_kobject
);
1694 char entry
= *attr
->name
;
1698 ret
= strict_strtol(buf
, 10, ¶m
);
1705 /* Disable charging */
1706 di
->susp_status
.ac_suspended
= true;
1707 di
->susp_status
.usb_suspended
= true;
1708 di
->susp_status
.suspended_change
= true;
1709 /* Trigger a state change */
1710 queue_work(di
->chargalg_wq
,
1711 &di
->chargalg_work
);
1714 /* Enable AC Charging */
1715 di
->susp_status
.ac_suspended
= false;
1716 di
->susp_status
.suspended_change
= true;
1717 /* Trigger a state change */
1718 queue_work(di
->chargalg_wq
,
1719 &di
->chargalg_work
);
1722 /* Enable USB charging */
1723 di
->susp_status
.usb_suspended
= false;
1724 di
->susp_status
.suspended_change
= true;
1725 /* Trigger a state change */
1726 queue_work(di
->chargalg_wq
,
1727 &di
->chargalg_work
);
1730 dev_info(di
->dev
, "Wrong input\n"
1731 "Enter 0. Disable AC/USB Charging\n"
1732 "1. Enable AC charging\n"
1733 "2. Enable USB Charging\n");
1740 static struct attribute abx500_chargalg_en_charger
= \
1743 .mode
= S_IRUGO
| S_IWUSR
,
1746 static struct attribute
*abx500_chargalg_chg
[] = {
1747 &abx500_chargalg_en_charger
,
1751 static const struct sysfs_ops abx500_chargalg_sysfs_ops
= {
1752 .show
= abx500_chargalg_sysfs_show
,
1753 .store
= abx500_chargalg_sysfs_charger
,
1756 static struct kobj_type abx500_chargalg_ktype
= {
1757 .sysfs_ops
= &abx500_chargalg_sysfs_ops
,
1758 .default_attrs
= abx500_chargalg_chg
,
1762 * abx500_chargalg_sysfs_exit() - de-init of sysfs entry
1763 * @di: pointer to the struct abx500_chargalg
1765 * This function removes the entry in sysfs.
1767 static void abx500_chargalg_sysfs_exit(struct abx500_chargalg
*di
)
1769 kobject_del(&di
->chargalg_kobject
);
1773 * abx500_chargalg_sysfs_init() - init of sysfs entry
1774 * @di: pointer to the struct abx500_chargalg
1776 * This function adds an entry in sysfs.
1777 * Returns error code in case of failure else 0(on success)
1779 static int abx500_chargalg_sysfs_init(struct abx500_chargalg
*di
)
1783 ret
= kobject_init_and_add(&di
->chargalg_kobject
,
1784 &abx500_chargalg_ktype
,
1785 NULL
, "abx500_chargalg");
1787 dev_err(di
->dev
, "failed to create sysfs entry\n");
1791 /* Exposure to the sysfs interface <<END>> */
1793 #if defined(CONFIG_PM)
1794 static int abx500_chargalg_resume(struct platform_device
*pdev
)
1796 struct abx500_chargalg
*di
= platform_get_drvdata(pdev
);
1798 /* Kick charger watchdog if charging (any charger online) */
1799 if (di
->chg_info
.online_chg
)
1800 queue_delayed_work(di
->chargalg_wq
, &di
->chargalg_wd_work
, 0);
1803 * Run the charging algorithm directly to be sure we don't
1806 queue_delayed_work(di
->chargalg_wq
, &di
->chargalg_periodic_work
, 0);
1811 static int abx500_chargalg_suspend(struct platform_device
*pdev
,
1814 struct abx500_chargalg
*di
= platform_get_drvdata(pdev
);
1816 if (di
->chg_info
.online_chg
)
1817 cancel_delayed_work_sync(&di
->chargalg_wd_work
);
1819 cancel_delayed_work_sync(&di
->chargalg_periodic_work
);
1824 #define abx500_chargalg_suspend NULL
1825 #define abx500_chargalg_resume NULL
1828 static int abx500_chargalg_remove(struct platform_device
*pdev
)
1830 struct abx500_chargalg
*di
= platform_get_drvdata(pdev
);
1832 /* sysfs interface to enable/disbale charging from user space */
1833 abx500_chargalg_sysfs_exit(di
);
1835 /* Delete the work queue */
1836 destroy_workqueue(di
->chargalg_wq
);
1838 flush_scheduled_work();
1839 power_supply_unregister(&di
->chargalg_psy
);
1840 platform_set_drvdata(pdev
, NULL
);
1845 static char *supply_interface
[] = {
1849 static int abx500_chargalg_probe(struct platform_device
*pdev
)
1851 struct device_node
*np
= pdev
->dev
.of_node
;
1852 struct abx500_bm_data
*plat
= pdev
->dev
.platform_data
;
1853 struct abx500_chargalg
*di
;
1856 di
= devm_kzalloc(&pdev
->dev
, sizeof(*di
), GFP_KERNEL
);
1858 dev_err(&pdev
->dev
, "%s no mem for ab8500_chargalg\n", __func__
);
1863 dev_err(&pdev
->dev
, "no battery management data supplied\n");
1869 ret
= ab8500_bm_of_probe(&pdev
->dev
, np
, di
->bm
);
1871 dev_err(&pdev
->dev
, "failed to get battery information\n");
1876 /* get device struct */
1877 di
->dev
= &pdev
->dev
;
1879 /* chargalg supply */
1880 di
->chargalg_psy
.name
= "abx500_chargalg";
1881 di
->chargalg_psy
.type
= POWER_SUPPLY_TYPE_BATTERY
;
1882 di
->chargalg_psy
.properties
= abx500_chargalg_props
;
1883 di
->chargalg_psy
.num_properties
= ARRAY_SIZE(abx500_chargalg_props
);
1884 di
->chargalg_psy
.get_property
= abx500_chargalg_get_property
;
1885 di
->chargalg_psy
.supplied_to
= supply_interface
;
1886 di
->chargalg_psy
.num_supplicants
= ARRAY_SIZE(supply_interface
),
1887 di
->chargalg_psy
.external_power_changed
=
1888 abx500_chargalg_external_power_changed
;
1890 /* Initilialize safety timer */
1891 init_timer(&di
->safety_timer
);
1892 di
->safety_timer
.function
= abx500_chargalg_safety_timer_expired
;
1893 di
->safety_timer
.data
= (unsigned long) di
;
1895 /* Initilialize maintenance timer */
1896 init_timer(&di
->maintenance_timer
);
1897 di
->maintenance_timer
.function
=
1898 abx500_chargalg_maintenance_timer_expired
;
1899 di
->maintenance_timer
.data
= (unsigned long) di
;
1901 /* Create a work queue for the chargalg */
1903 create_singlethread_workqueue("abx500_chargalg_wq");
1904 if (di
->chargalg_wq
== NULL
) {
1905 dev_err(di
->dev
, "failed to create work queue\n");
1909 /* Init work for chargalg */
1910 INIT_DEFERRABLE_WORK(&di
->chargalg_periodic_work
,
1911 abx500_chargalg_periodic_work
);
1912 INIT_DEFERRABLE_WORK(&di
->chargalg_wd_work
,
1913 abx500_chargalg_wd_work
);
1915 /* Init work for chargalg */
1916 INIT_WORK(&di
->chargalg_work
, abx500_chargalg_work
);
1918 /* To detect charger at startup */
1919 di
->chg_info
.prev_conn_chg
= -1;
1921 /* Register chargalg power supply class */
1922 ret
= power_supply_register(di
->dev
, &di
->chargalg_psy
);
1924 dev_err(di
->dev
, "failed to register chargalg psy\n");
1925 goto free_chargalg_wq
;
1928 platform_set_drvdata(pdev
, di
);
1930 /* sysfs interface to enable/disable charging from user space */
1931 ret
= abx500_chargalg_sysfs_init(di
);
1933 dev_err(di
->dev
, "failed to create sysfs entry\n");
1937 /* Run the charging algorithm */
1938 queue_delayed_work(di
->chargalg_wq
, &di
->chargalg_periodic_work
, 0);
1940 dev_info(di
->dev
, "probe success\n");
1944 power_supply_unregister(&di
->chargalg_psy
);
1946 destroy_workqueue(di
->chargalg_wq
);
1950 static const struct of_device_id ab8500_chargalg_match
[] = {
1951 { .compatible
= "stericsson,ab8500-chargalg", },
1955 static struct platform_driver abx500_chargalg_driver
= {
1956 .probe
= abx500_chargalg_probe
,
1957 .remove
= abx500_chargalg_remove
,
1958 .suspend
= abx500_chargalg_suspend
,
1959 .resume
= abx500_chargalg_resume
,
1961 .name
= "ab8500-chargalg",
1962 .owner
= THIS_MODULE
,
1963 .of_match_table
= ab8500_chargalg_match
,
1967 static int __init
abx500_chargalg_init(void)
1969 return platform_driver_register(&abx500_chargalg_driver
);
1972 static void __exit
abx500_chargalg_exit(void)
1974 platform_driver_unregister(&abx500_chargalg_driver
);
1977 module_init(abx500_chargalg_init
);
1978 module_exit(abx500_chargalg_exit
);
1980 MODULE_LICENSE("GPL v2");
1981 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
1982 MODULE_ALIAS("platform:abx500-chargalg");
1983 MODULE_DESCRIPTION("abx500 battery charging algorithm");