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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / power / supply / ab8500_chargalg.c
blob14e1b448bd39b286404f31509dbe006d16390877
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2012
4 * Copyright (c) 2012 Sony Mobile Communications AB
5 *
6 * Charging algorithm driver for AB8500
7 *
8 * Authors:
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>
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/device.h>
18 #include <linux/component.h>
19 #include <linux/hrtimer.h>
20 #include <linux/interrupt.h>
21 #include <linux/delay.h>
22 #include <linux/slab.h>
23 #include <linux/platform_device.h>
24 #include <linux/power_supply.h>
25 #include <linux/completion.h>
26 #include <linux/workqueue.h>
27 #include <linux/kobject.h>
28 #include <linux/of.h>
29 #include <linux/mfd/core.h>
30 #include <linux/mfd/abx500.h>
31 #include <linux/mfd/abx500/ab8500.h>
32 #include <linux/notifier.h>
33
34 #include "ab8500-bm.h"
35 #include "ab8500-chargalg.h"
36
37 /* Watchdog kick interval */
38 #define CHG_WD_INTERVAL (6 * HZ)
39
40 /* End-of-charge criteria counter */
41 #define EOC_COND_CNT 10
42
43 /* One hour expressed in seconds */
44 #define ONE_HOUR_IN_SECONDS 3600
45
46 /* Five minutes expressed in seconds */
47 #define FIVE_MINUTES_IN_SECONDS 300
48
49 /*
50 * This is the battery capacity limit that will trigger a new
51 * full charging cycle in the case where maintenance charging
52 * has been disabled
53 */
54 #define AB8500_RECHARGE_CAP 95
55
56 enum ab8500_chargers {
57 NO_CHG,
58 AC_CHG,
59 USB_CHG,
60 };
61
62 struct ab8500_chargalg_charger_info {
63 enum ab8500_chargers conn_chg;
64 enum ab8500_chargers prev_conn_chg;
65 enum ab8500_chargers online_chg;
66 enum ab8500_chargers prev_online_chg;
67 enum ab8500_chargers charger_type;
68 bool usb_chg_ok;
69 bool ac_chg_ok;
70 int usb_volt_uv;
71 int usb_curr_ua;
72 int ac_volt_uv;
73 int ac_curr_ua;
74 int usb_vset_uv;
75 int usb_iset_ua;
76 int ac_vset_uv;
77 int ac_iset_ua;
78 };
79
80 struct ab8500_chargalg_battery_data {
81 int temp;
82 int volt_uv;
83 int avg_curr_ua;
84 int inst_curr_ua;
85 int percent;
86 };
87
88 enum ab8500_chargalg_states {
89 STATE_HANDHELD_INIT,
90 STATE_HANDHELD,
91 STATE_CHG_NOT_OK_INIT,
92 STATE_CHG_NOT_OK,
93 STATE_HW_TEMP_PROTECT_INIT,
94 STATE_HW_TEMP_PROTECT,
95 STATE_NORMAL_INIT,
96 STATE_NORMAL,
97 STATE_WAIT_FOR_RECHARGE_INIT,
98 STATE_WAIT_FOR_RECHARGE,
99 STATE_MAINTENANCE_A_INIT,
100 STATE_MAINTENANCE_A,
101 STATE_MAINTENANCE_B_INIT,
102 STATE_MAINTENANCE_B,
103 STATE_TEMP_UNDEROVER_INIT,
104 STATE_TEMP_UNDEROVER,
105 STATE_TEMP_LOWHIGH_INIT,
106 STATE_TEMP_LOWHIGH,
107 STATE_OVV_PROTECT_INIT,
108 STATE_OVV_PROTECT,
109 STATE_SAFETY_TIMER_EXPIRED_INIT,
110 STATE_SAFETY_TIMER_EXPIRED,
111 STATE_BATT_REMOVED_INIT,
112 STATE_BATT_REMOVED,
113 STATE_WD_EXPIRED_INIT,
114 STATE_WD_EXPIRED,
115 };
116
117 static const char * const states[] = {
118 "HANDHELD_INIT",
119 "HANDHELD",
120 "CHG_NOT_OK_INIT",
121 "CHG_NOT_OK",
122 "HW_TEMP_PROTECT_INIT",
123 "HW_TEMP_PROTECT",
124 "NORMAL_INIT",
125 "NORMAL",
126 "WAIT_FOR_RECHARGE_INIT",
127 "WAIT_FOR_RECHARGE",
128 "MAINTENANCE_A_INIT",
129 "MAINTENANCE_A",
130 "MAINTENANCE_B_INIT",
131 "MAINTENANCE_B",
132 "TEMP_UNDEROVER_INIT",
133 "TEMP_UNDEROVER",
134 "TEMP_LOWHIGH_INIT",
135 "TEMP_LOWHIGH",
136 "OVV_PROTECT_INIT",
137 "OVV_PROTECT",
138 "SAFETY_TIMER_EXPIRED_INIT",
139 "SAFETY_TIMER_EXPIRED",
140 "BATT_REMOVED_INIT",
141 "BATT_REMOVED",
142 "WD_EXPIRED_INIT",
143 "WD_EXPIRED",
144 };
145
146 struct ab8500_chargalg_events {
147 bool batt_unknown;
148 bool mainextchnotok;
149 bool batt_ovv;
150 bool batt_rem;
151 bool btemp_underover;
152 bool btemp_low;
153 bool btemp_high;
154 bool main_thermal_prot;
155 bool usb_thermal_prot;
156 bool main_ovv;
157 bool vbus_ovv;
158 bool usbchargernotok;
159 bool safety_timer_expired;
160 bool maintenance_timer_expired;
161 bool ac_wd_expired;
162 bool usb_wd_expired;
163 bool ac_cv_active;
164 bool usb_cv_active;
165 bool vbus_collapsed;
166 };
167
168 /**
169 * struct ab8500_charge_curr_maximization - Charger maximization parameters
170 * @original_iset_ua: the non optimized/maximised charger current
171 * @current_iset_ua: the charging current used at this moment
172 * @condition_cnt: number of iterations needed before a new charger current
173 is set
174 * @max_current_ua: maximum charger current
175 * @wait_cnt: to avoid too fast current step down in case of charger
176 * voltage collapse, we insert this delay between step
177 * down
178 * @level: tells in how many steps the charging current has been
179 increased
180 */
181 struct ab8500_charge_curr_maximization {
182 int original_iset_ua;
183 int current_iset_ua;
184 int condition_cnt;
185 int max_current_ua;
186 int wait_cnt;
187 u8 level;
188 };
189
190 enum maxim_ret {
191 MAXIM_RET_NOACTION,
192 MAXIM_RET_CHANGE,
193 MAXIM_RET_IBAT_TOO_HIGH,
194 };
195
196 /**
197 * struct ab8500_chargalg - ab8500 Charging algorithm device information
198 * @dev: pointer to the structure device
199 * @charge_status: battery operating status
200 * @eoc_cnt: counter used to determine end-of_charge
201 * @maintenance_chg: indicate if maintenance charge is active
202 * @t_hyst_norm temperature hysteresis when the temperature has been
203 * over or under normal limits
204 * @t_hyst_lowhigh temperature hysteresis when the temperature has been
205 * over or under the high or low limits
206 * @charge_state: current state of the charging algorithm
207 * @ccm charging current maximization parameters
208 * @chg_info: information about connected charger types
209 * @batt_data: data of the battery
210 * @bm: Platform specific battery management information
211 * @parent: pointer to the struct ab8500
212 * @chargalg_psy: structure that holds the battery properties exposed by
213 * the charging algorithm
214 * @events: structure for information about events triggered
215 * @chargalg_wq: work queue for running the charging algorithm
216 * @chargalg_periodic_work: work to run the charging algorithm periodically
217 * @chargalg_wd_work: work to kick the charger watchdog periodically
218 * @chargalg_work: work to run the charging algorithm instantly
219 * @safety_timer: charging safety timer
220 * @maintenance_timer: maintenance charging timer
221 * @chargalg_kobject: structure of type kobject
222 */
223 struct ab8500_chargalg {
224 struct device *dev;
225 int charge_status;
226 int eoc_cnt;
227 bool maintenance_chg;
228 int t_hyst_norm;
229 int t_hyst_lowhigh;
230 enum ab8500_chargalg_states charge_state;
231 struct ab8500_charge_curr_maximization ccm;
232 struct ab8500_chargalg_charger_info chg_info;
233 struct ab8500_chargalg_battery_data batt_data;
234 struct ab8500 *parent;
235 struct ab8500_bm_data *bm;
236 struct power_supply *chargalg_psy;
237 struct ux500_charger *ac_chg;
238 struct ux500_charger *usb_chg;
239 struct ab8500_chargalg_events events;
240 struct workqueue_struct *chargalg_wq;
241 struct delayed_work chargalg_periodic_work;
242 struct delayed_work chargalg_wd_work;
243 struct work_struct chargalg_work;
244 struct hrtimer safety_timer;
245 struct hrtimer maintenance_timer;
246 struct kobject chargalg_kobject;
247 };
248
249 /* Main battery properties */
250 static enum power_supply_property ab8500_chargalg_props[] = {
251 POWER_SUPPLY_PROP_STATUS,
252 POWER_SUPPLY_PROP_HEALTH,
253 };
254
255 /**
256 * ab8500_chargalg_safety_timer_expired() - Expiration of the safety timer
257 * @timer: pointer to the hrtimer structure
258 *
259 * This function gets called when the safety timer for the charger
260 * expires
261 */
262 static enum hrtimer_restart
263 ab8500_chargalg_safety_timer_expired(struct hrtimer *timer)
264 {
265 struct ab8500_chargalg *di = container_of(timer, struct ab8500_chargalg,
266 safety_timer);
267 dev_err(di->dev, "Safety timer expired\n");
268 di->events.safety_timer_expired = true;
269
270 /* Trigger execution of the algorithm instantly */
271 queue_work(di->chargalg_wq, &di->chargalg_work);
272
273 return HRTIMER_NORESTART;
274 }
275
276 /**
277 * ab8500_chargalg_maintenance_timer_expired() - Expiration of
278 * the maintenance timer
279 * @timer: pointer to the timer structure
280 *
281 * This function gets called when the maintenance timer
282 * expires
283 */
284 static enum hrtimer_restart
285 ab8500_chargalg_maintenance_timer_expired(struct hrtimer *timer)
286 {
287
288 struct ab8500_chargalg *di = container_of(timer, struct ab8500_chargalg,
289 maintenance_timer);
290
291 dev_dbg(di->dev, "Maintenance timer expired\n");
292 di->events.maintenance_timer_expired = true;
293
294 /* Trigger execution of the algorithm instantly */
295 queue_work(di->chargalg_wq, &di->chargalg_work);
296
297 return HRTIMER_NORESTART;
298 }
299
300 /**
301 * ab8500_chargalg_state_to() - Change charge state
302 * @di: pointer to the ab8500_chargalg structure
303 *
304 * This function gets called when a charge state change should occur
305 */
306 static void ab8500_chargalg_state_to(struct ab8500_chargalg *di,
307 enum ab8500_chargalg_states state)
308 {
309 dev_dbg(di->dev,
310 "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
311 di->charge_state == state ? "NO" : "YES",
312 di->charge_state,
313 states[di->charge_state],
314 state,
315 states[state]);
316
317 di->charge_state = state;
318 }
319
320 static int ab8500_chargalg_check_charger_enable(struct ab8500_chargalg *di)
321 {
322 struct power_supply_battery_info *bi = di->bm->bi;
323
324 switch (di->charge_state) {
325 case STATE_NORMAL:
326 case STATE_MAINTENANCE_A:
327 case STATE_MAINTENANCE_B:
328 break;
329 default:
330 return 0;
331 }
332
333 if (di->chg_info.charger_type & USB_CHG) {
334 return di->usb_chg->ops.check_enable(di->usb_chg,
335 bi->constant_charge_voltage_max_uv,
336 bi->constant_charge_current_max_ua);
337 } else if (di->chg_info.charger_type & AC_CHG) {
338 return di->ac_chg->ops.check_enable(di->ac_chg,
339 bi->constant_charge_voltage_max_uv,
340 bi->constant_charge_current_max_ua);
341 }
342 return 0;
343 }
344
345 /**
346 * ab8500_chargalg_check_charger_connection() - Check charger connection change
347 * @di: pointer to the ab8500_chargalg structure
348 *
349 * This function will check if there is a change in the charger connection
350 * and change charge state accordingly. AC has precedence over USB.
351 */
352 static int ab8500_chargalg_check_charger_connection(struct ab8500_chargalg *di)
353 {
354 if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg) {
355 /* Charger state changed since last update */
356 if (di->chg_info.conn_chg & AC_CHG) {
357 dev_info(di->dev, "Charging source is AC\n");
358 if (di->chg_info.charger_type != AC_CHG) {
359 di->chg_info.charger_type = AC_CHG;
360 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
361 }
362 } else if (di->chg_info.conn_chg & USB_CHG) {
363 dev_info(di->dev, "Charging source is USB\n");
364 di->chg_info.charger_type = USB_CHG;
365 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
366 } else {
367 dev_dbg(di->dev, "Charging source is OFF\n");
368 di->chg_info.charger_type = NO_CHG;
369 ab8500_chargalg_state_to(di, STATE_HANDHELD_INIT);
370 }
371 di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
372 }
373 return di->chg_info.conn_chg;
374 }
375
376 /**
377 * ab8500_chargalg_start_safety_timer() - Start charging safety timer
378 * @di: pointer to the ab8500_chargalg structure
379 *
380 * The safety timer is used to avoid overcharging of old or bad batteries.
381 * There are different timers for AC and USB
382 */
383 static void ab8500_chargalg_start_safety_timer(struct ab8500_chargalg *di)
384 {
385 /* Charger-dependent expiration time in hours*/
386 int timer_expiration = 0;
387
388 switch (di->chg_info.charger_type) {
389 case AC_CHG:
390 timer_expiration = di->bm->main_safety_tmr_h;
391 break;
392
393 case USB_CHG:
394 timer_expiration = di->bm->usb_safety_tmr_h;
395 break;
396
397 default:
398 dev_err(di->dev, "Unknown charger to charge from\n");
399 break;
400 }
401
402 di->events.safety_timer_expired = false;
403 hrtimer_set_expires_range(&di->safety_timer,
404 ktime_set(timer_expiration * ONE_HOUR_IN_SECONDS, 0),
405 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
406 hrtimer_start_expires(&di->safety_timer, HRTIMER_MODE_REL);
407 }
408
409 /**
410 * ab8500_chargalg_stop_safety_timer() - Stop charging safety timer
411 * @di: pointer to the ab8500_chargalg structure
412 *
413 * The safety timer is stopped whenever the NORMAL state is exited
414 */
415 static void ab8500_chargalg_stop_safety_timer(struct ab8500_chargalg *di)
416 {
417 if (hrtimer_try_to_cancel(&di->safety_timer) >= 0)
418 di->events.safety_timer_expired = false;
419 }
420
421 /**
422 * ab8500_chargalg_start_maintenance_timer() - Start charging maintenance timer
423 * @di: pointer to the ab8500_chargalg structure
424 * @duration: duration of the maintenance timer in minutes
425 *
426 * The maintenance timer is used to maintain the charge in the battery once
427 * the battery is considered full. These timers are chosen to match the
428 * discharge curve of the battery
429 */
430 static void ab8500_chargalg_start_maintenance_timer(struct ab8500_chargalg *di,
431 int duration)
432 {
433 /* Set a timer in minutes with a 30 second range */
434 hrtimer_set_expires_range(&di->maintenance_timer,
435 ktime_set(duration * 60, 0),
436 ktime_set(30, 0));
437 di->events.maintenance_timer_expired = false;
438 hrtimer_start_expires(&di->maintenance_timer, HRTIMER_MODE_REL);
439 }
440
441 /**
442 * ab8500_chargalg_stop_maintenance_timer() - Stop maintenance timer
443 * @di: pointer to the ab8500_chargalg structure
444 *
445 * The maintenance timer is stopped whenever maintenance ends or when another
446 * state is entered
447 */
448 static void ab8500_chargalg_stop_maintenance_timer(struct ab8500_chargalg *di)
449 {
450 if (hrtimer_try_to_cancel(&di->maintenance_timer) >= 0)
451 di->events.maintenance_timer_expired = false;
452 }
453
454 /**
455 * ab8500_chargalg_kick_watchdog() - Kick charger watchdog
456 * @di: pointer to the ab8500_chargalg structure
457 *
458 * The charger watchdog have to be kicked periodically whenever the charger is
459 * on, else the ABB will reset the system
460 */
461 static int ab8500_chargalg_kick_watchdog(struct ab8500_chargalg *di)
462 {
463 /* Check if charger exists and kick watchdog if charging */
464 if (di->ac_chg && di->ac_chg->ops.kick_wd &&
465 di->chg_info.online_chg & AC_CHG) {
466 return di->ac_chg->ops.kick_wd(di->ac_chg);
467 } else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
468 di->chg_info.online_chg & USB_CHG)
469 return di->usb_chg->ops.kick_wd(di->usb_chg);
470
471 return -ENXIO;
472 }
473
474 /**
475 * ab8500_chargalg_ac_en() - Turn on/off the AC charger
476 * @di: pointer to the ab8500_chargalg structure
477 * @enable: charger on/off
478 * @vset_uv: requested charger output voltage in microvolt
479 * @iset_ua: requested charger output current in microampere
480 *
481 * The AC charger will be turned on/off with the requested charge voltage and
482 * current
483 */
484 static int ab8500_chargalg_ac_en(struct ab8500_chargalg *di, int enable,
485 int vset_uv, int iset_ua)
486 {
487 if (!di->ac_chg || !di->ac_chg->ops.enable)
488 return -ENXIO;
489
490 /* Select maximum of what both the charger and the battery supports */
491 if (di->ac_chg->max_out_volt_uv)
492 vset_uv = min(vset_uv, di->ac_chg->max_out_volt_uv);
493 if (di->ac_chg->max_out_curr_ua)
494 iset_ua = min(iset_ua, di->ac_chg->max_out_curr_ua);
495
496 di->chg_info.ac_iset_ua = iset_ua;
497 di->chg_info.ac_vset_uv = vset_uv;
498
499 return di->ac_chg->ops.enable(di->ac_chg, enable, vset_uv, iset_ua);
500 }
501
502 /**
503 * ab8500_chargalg_usb_en() - Turn on/off the USB charger
504 * @di: pointer to the ab8500_chargalg structure
505 * @enable: charger on/off
506 * @vset_uv: requested charger output voltage in microvolt
507 * @iset_ua: requested charger output current in microampere
508 *
509 * The USB charger will be turned on/off with the requested charge voltage and
510 * current
511 */
512 static int ab8500_chargalg_usb_en(struct ab8500_chargalg *di, int enable,
513 int vset_uv, int iset_ua)
514 {
515 if (!di->usb_chg || !di->usb_chg->ops.enable)
516 return -ENXIO;
517
518 /* Select maximum of what both the charger and the battery supports */
519 if (di->usb_chg->max_out_volt_uv)
520 vset_uv = min(vset_uv, di->usb_chg->max_out_volt_uv);
521 if (di->usb_chg->max_out_curr_ua)
522 iset_ua = min(iset_ua, di->usb_chg->max_out_curr_ua);
523
524 di->chg_info.usb_iset_ua = iset_ua;
525 di->chg_info.usb_vset_uv = vset_uv;
526
527 return di->usb_chg->ops.enable(di->usb_chg, enable, vset_uv, iset_ua);
528 }
529
530 /**
531 * ab8500_chargalg_update_chg_curr() - Update charger current
532 * @di: pointer to the ab8500_chargalg structure
533 * @iset_ua: requested charger output current in microampere
534 *
535 * The charger output current will be updated for the charger
536 * that is currently in use
537 */
538 static int ab8500_chargalg_update_chg_curr(struct ab8500_chargalg *di,
539 int iset_ua)
540 {
541 /* Check if charger exists and update current if charging */
542 if (di->ac_chg && di->ac_chg->ops.update_curr &&
543 di->chg_info.charger_type & AC_CHG) {
544 /*
545 * Select maximum of what both the charger
546 * and the battery supports
547 */
548 if (di->ac_chg->max_out_curr_ua)
549 iset_ua = min(iset_ua, di->ac_chg->max_out_curr_ua);
550
551 di->chg_info.ac_iset_ua = iset_ua;
552
553 return di->ac_chg->ops.update_curr(di->ac_chg, iset_ua);
554 } else if (di->usb_chg && di->usb_chg->ops.update_curr &&
555 di->chg_info.charger_type & USB_CHG) {
556 /*
557 * Select maximum of what both the charger
558 * and the battery supports
559 */
560 if (di->usb_chg->max_out_curr_ua)
561 iset_ua = min(iset_ua, di->usb_chg->max_out_curr_ua);
562
563 di->chg_info.usb_iset_ua = iset_ua;
564
565 return di->usb_chg->ops.update_curr(di->usb_chg, iset_ua);
566 }
567
568 return -ENXIO;
569 }
570
571 /**
572 * ab8500_chargalg_stop_charging() - Stop charging
573 * @di: pointer to the ab8500_chargalg structure
574 *
575 * This function is called from any state where charging should be stopped.
576 * All charging is disabled and all status parameters and timers are changed
577 * accordingly
578 */
579 static void ab8500_chargalg_stop_charging(struct ab8500_chargalg *di)
580 {
581 ab8500_chargalg_ac_en(di, false, 0, 0);
582 ab8500_chargalg_usb_en(di, false, 0, 0);
583 ab8500_chargalg_stop_safety_timer(di);
584 ab8500_chargalg_stop_maintenance_timer(di);
585 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
586 di->maintenance_chg = false;
587 cancel_delayed_work(&di->chargalg_wd_work);
588 power_supply_changed(di->chargalg_psy);
589 }
590
591 /**
592 * ab8500_chargalg_hold_charging() - Pauses charging
593 * @di: pointer to the ab8500_chargalg structure
594 *
595 * This function is called in the case where maintenance charging has been
596 * disabled and instead a battery voltage mode is entered to check when the
597 * battery voltage has reached a certain recharge voltage
598 */
599 static void ab8500_chargalg_hold_charging(struct ab8500_chargalg *di)
600 {
601 ab8500_chargalg_ac_en(di, false, 0, 0);
602 ab8500_chargalg_usb_en(di, false, 0, 0);
603 ab8500_chargalg_stop_safety_timer(di);
604 ab8500_chargalg_stop_maintenance_timer(di);
605 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
606 di->maintenance_chg = false;
607 cancel_delayed_work(&di->chargalg_wd_work);
608 power_supply_changed(di->chargalg_psy);
609 }
610
611 /**
612 * ab8500_chargalg_start_charging() - Start the charger
613 * @di: pointer to the ab8500_chargalg structure
614 * @vset_uv: requested charger output voltage in microvolt
615 * @iset_ua: requested charger output current in microampere
616 *
617 * A charger will be enabled depending on the requested charger type that was
618 * detected previously.
619 */
620 static void ab8500_chargalg_start_charging(struct ab8500_chargalg *di,
621 int vset_uv, int iset_ua)
622 {
623 switch (di->chg_info.charger_type) {
624 case AC_CHG:
625 dev_dbg(di->dev,
626 "AC parameters: Vset %d, Ich %d\n", vset_uv, iset_ua);
627 ab8500_chargalg_usb_en(di, false, 0, 0);
628 ab8500_chargalg_ac_en(di, true, vset_uv, iset_ua);
629 break;
630
631 case USB_CHG:
632 dev_dbg(di->dev,
633 "USB parameters: Vset %d, Ich %d\n", vset_uv, iset_ua);
634 ab8500_chargalg_ac_en(di, false, 0, 0);
635 ab8500_chargalg_usb_en(di, true, vset_uv, iset_ua);
636 break;
637
638 default:
639 dev_err(di->dev, "Unknown charger to charge from\n");
640 break;
641 }
642 }
643
644 /**
645 * ab8500_chargalg_check_temp() - Check battery temperature ranges
646 * @di: pointer to the ab8500_chargalg structure
647 *
648 * The battery temperature is checked against the predefined limits and the
649 * charge state is changed accordingly
650 */
651 static void ab8500_chargalg_check_temp(struct ab8500_chargalg *di)
652 {
653 struct power_supply_battery_info *bi = di->bm->bi;
654
655 if (di->batt_data.temp > (bi->temp_alert_min + di->t_hyst_norm) &&
656 di->batt_data.temp < (bi->temp_alert_max - di->t_hyst_norm)) {
657 /* Temp OK! */
658 di->events.btemp_underover = false;
659 di->events.btemp_low = false;
660 di->events.btemp_high = false;
661 di->t_hyst_norm = 0;
662 di->t_hyst_lowhigh = 0;
663 } else {
664 if ((di->batt_data.temp >= bi->temp_alert_max) &&
665 (di->batt_data.temp < (bi->temp_max - di->t_hyst_lowhigh))) {
666 /* Alert zone for high temperature */
667 di->events.btemp_underover = false;
668 di->events.btemp_high = true;
669 di->t_hyst_norm = di->bm->temp_hysteresis;
670 di->t_hyst_lowhigh = 0;
671 } else if ((di->batt_data.temp > (bi->temp_min + di->t_hyst_lowhigh)) &&
672 (di->batt_data.temp <= bi->temp_alert_min)) {
673 /* Alert zone for low temperature */
674 di->events.btemp_underover = false;
675 di->events.btemp_low = true;
676 di->t_hyst_norm = di->bm->temp_hysteresis;
677 di->t_hyst_lowhigh = 0;
678 } else if (di->batt_data.temp <= bi->temp_min ||
679 di->batt_data.temp >= bi->temp_max) {
680 /* TEMP major!!!!! */
681 di->events.btemp_underover = true;
682 di->events.btemp_low = false;
683 di->events.btemp_high = false;
684 di->t_hyst_norm = 0;
685 di->t_hyst_lowhigh = di->bm->temp_hysteresis;
686 } else {
687 /* Within hysteresis */
688 dev_dbg(di->dev, "Within hysteresis limit temp: %d "
689 "hyst_lowhigh %d, hyst normal %d\n",
690 di->batt_data.temp, di->t_hyst_lowhigh,
691 di->t_hyst_norm);
692 }
693 }
694 }
695
696 /**
697 * ab8500_chargalg_check_charger_voltage() - Check charger voltage
698 * @di: pointer to the ab8500_chargalg structure
699 *
700 * Charger voltage is checked against maximum limit
701 */
702 static void ab8500_chargalg_check_charger_voltage(struct ab8500_chargalg *di)
703 {
704 if (di->chg_info.usb_volt_uv > di->bm->chg_params->usb_volt_max_uv)
705 di->chg_info.usb_chg_ok = false;
706 else
707 di->chg_info.usb_chg_ok = true;
708
709 if (di->chg_info.ac_volt_uv > di->bm->chg_params->ac_volt_max_uv)
710 di->chg_info.ac_chg_ok = false;
711 else
712 di->chg_info.ac_chg_ok = true;
713
714 }
715
716 /**
717 * ab8500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
718 * @di: pointer to the ab8500_chargalg structure
719 *
720 * End-of-charge criteria is fulfilled when the battery voltage is above a
721 * certain limit and the battery current is below a certain limit for a
722 * predefined number of consecutive seconds. If true, the battery is full
723 */
724 static void ab8500_chargalg_end_of_charge(struct ab8500_chargalg *di)
725 {
726 if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
727 di->charge_state == STATE_NORMAL &&
728 !di->maintenance_chg && (di->batt_data.volt_uv >=
729 di->bm->bi->voltage_max_design_uv ||
730 di->events.usb_cv_active || di->events.ac_cv_active) &&
731 di->batt_data.avg_curr_ua <
732 di->bm->bi->charge_term_current_ua &&
733 di->batt_data.avg_curr_ua > 0) {
734 if (++di->eoc_cnt >= EOC_COND_CNT) {
735 di->eoc_cnt = 0;
736 di->charge_status = POWER_SUPPLY_STATUS_FULL;
737 di->maintenance_chg = true;
738 dev_dbg(di->dev, "EOC reached!\n");
739 power_supply_changed(di->chargalg_psy);
740 } else {
741 dev_dbg(di->dev,
742 " EOC limit reached for the %d"
743 " time, out of %d before EOC\n",
744 di->eoc_cnt,
745 EOC_COND_CNT);
746 }
747 } else {
748 di->eoc_cnt = 0;
749 }
750 }
751
752 static void init_maxim_chg_curr(struct ab8500_chargalg *di)
753 {
754 struct power_supply_battery_info *bi = di->bm->bi;
755
756 di->ccm.original_iset_ua = bi->constant_charge_current_max_ua;
757 di->ccm.current_iset_ua = bi->constant_charge_current_max_ua;
758 di->ccm.max_current_ua = di->bm->maxi->chg_curr_ua;
759 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
760 di->ccm.level = 0;
761 }
762
763 /**
764 * ab8500_chargalg_chg_curr_maxim - increases the charger current to
765 * compensate for the system load
766 * @di pointer to the ab8500_chargalg structure
767 *
768 * This maximization function is used to raise the charger current to get the
769 * battery current as close to the optimal value as possible. The battery
770 * current during charging is affected by the system load
771 */
772 static enum maxim_ret ab8500_chargalg_chg_curr_maxim(struct ab8500_chargalg *di)
773 {
774
775 if (!di->bm->maxi->ena_maxi)
776 return MAXIM_RET_NOACTION;
777
778 if (di->events.vbus_collapsed) {
779 dev_dbg(di->dev, "Charger voltage has collapsed %d\n",
780 di->ccm.wait_cnt);
781 if (di->ccm.wait_cnt == 0) {
782 dev_dbg(di->dev, "lowering current\n");
783 di->ccm.wait_cnt++;
784 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
785 di->ccm.max_current_ua = di->ccm.current_iset_ua;
786 di->ccm.current_iset_ua = di->ccm.max_current_ua;
787 di->ccm.level--;
788 return MAXIM_RET_CHANGE;
789 } else {
790 dev_dbg(di->dev, "waiting\n");
791 /* Let's go in here twice before lowering curr again */
792 di->ccm.wait_cnt = (di->ccm.wait_cnt + 1) % 3;
793 return MAXIM_RET_NOACTION;
794 }
795 }
796
797 di->ccm.wait_cnt = 0;
798
799 if (di->batt_data.inst_curr_ua > di->ccm.original_iset_ua) {
800 dev_dbg(di->dev, " Maximization Ibat (%duA) too high"
801 " (limit %duA) (current iset: %duA)!\n",
802 di->batt_data.inst_curr_ua, di->ccm.original_iset_ua,
803 di->ccm.current_iset_ua);
804
805 if (di->ccm.current_iset_ua == di->ccm.original_iset_ua)
806 return MAXIM_RET_NOACTION;
807
808 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
809 di->ccm.current_iset_ua = di->ccm.original_iset_ua;
810 di->ccm.level = 0;
811
812 return MAXIM_RET_IBAT_TOO_HIGH;
813 }
814
815 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
816 return MAXIM_RET_NOACTION;
817 }
818
819 static void handle_maxim_chg_curr(struct ab8500_chargalg *di)
820 {
821 struct power_supply_battery_info *bi = di->bm->bi;
822 enum maxim_ret ret;
823 int result;
824
825 ret = ab8500_chargalg_chg_curr_maxim(di);
826 switch (ret) {
827 case MAXIM_RET_CHANGE:
828 result = ab8500_chargalg_update_chg_curr(di,
829 di->ccm.current_iset_ua);
830 if (result)
831 dev_err(di->dev, "failed to set chg curr\n");
832 break;
833 case MAXIM_RET_IBAT_TOO_HIGH:
834 result = ab8500_chargalg_update_chg_curr(di,
835 bi->constant_charge_current_max_ua);
836 if (result)
837 dev_err(di->dev, "failed to set chg curr\n");
838 break;
839
840 case MAXIM_RET_NOACTION:
841 default:
842 /* Do nothing..*/
843 break;
844 }
845 }
846
847 static int ab8500_chargalg_get_ext_psy_data(struct device *dev, void *data)
848 {
849 struct power_supply *psy;
850 struct power_supply *ext = dev_get_drvdata(dev);
851 const char **supplicants = (const char **)ext->supplied_to;
852 struct ab8500_chargalg *di;
853 union power_supply_propval ret;
854 int j;
855 bool capacity_updated = false;
856
857 psy = (struct power_supply *)data;
858 di = power_supply_get_drvdata(psy);
859 /* For all psy where the driver name appears in any supplied_to */
860 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
861 if (j < 0)
862 return 0;
863
864 /*
865 * If external is not registering 'POWER_SUPPLY_PROP_CAPACITY' to its
866 * property because of handling that sysfs entry on its own, this is
867 * the place to get the battery capacity.
868 */
869 if (!power_supply_get_property(ext, POWER_SUPPLY_PROP_CAPACITY, &ret)) {
870 di->batt_data.percent = ret.intval;
871 capacity_updated = true;
872 }
873
874 /* Go through all properties for the psy */
875 for (j = 0; j < ext->desc->num_properties; j++) {
876 enum power_supply_property prop;
877 prop = ext->desc->properties[j];
878
879 /*
880 * Initialize chargers if not already done.
881 * The ab8500_charger*/
882 if (!di->ac_chg &&
883 ext->desc->type == POWER_SUPPLY_TYPE_MAINS)
884 di->ac_chg = psy_to_ux500_charger(ext);
885 else if (!di->usb_chg &&
886 ext->desc->type == POWER_SUPPLY_TYPE_USB)
887 di->usb_chg = psy_to_ux500_charger(ext);
888
889 if (power_supply_get_property(ext, prop, &ret))
890 continue;
891 switch (prop) {
892 case POWER_SUPPLY_PROP_PRESENT:
893 switch (ext->desc->type) {
894 case POWER_SUPPLY_TYPE_BATTERY:
895 /* Battery present */
896 if (ret.intval)
897 di->events.batt_rem = false;
898 /* Battery removed */
899 else
900 di->events.batt_rem = true;
901 break;
902 case POWER_SUPPLY_TYPE_MAINS:
903 /* AC disconnected */
904 if (!ret.intval &&
905 (di->chg_info.conn_chg & AC_CHG)) {
906 di->chg_info.prev_conn_chg =
907 di->chg_info.conn_chg;
908 di->chg_info.conn_chg &= ~AC_CHG;
909 }
910 /* AC connected */
911 else if (ret.intval &&
912 !(di->chg_info.conn_chg & AC_CHG)) {
913 di->chg_info.prev_conn_chg =
914 di->chg_info.conn_chg;
915 di->chg_info.conn_chg |= AC_CHG;
916 }
917 break;
918 case POWER_SUPPLY_TYPE_USB:
919 /* USB disconnected */
920 if (!ret.intval &&
921 (di->chg_info.conn_chg & USB_CHG)) {
922 di->chg_info.prev_conn_chg =
923 di->chg_info.conn_chg;
924 di->chg_info.conn_chg &= ~USB_CHG;
925 }
926 /* USB connected */
927 else if (ret.intval &&
928 !(di->chg_info.conn_chg & USB_CHG)) {
929 di->chg_info.prev_conn_chg =
930 di->chg_info.conn_chg;
931 di->chg_info.conn_chg |= USB_CHG;
932 }
933 break;
934 default:
935 break;
936 }
937 break;
938
939 case POWER_SUPPLY_PROP_ONLINE:
940 switch (ext->desc->type) {
941 case POWER_SUPPLY_TYPE_BATTERY:
942 break;
943 case POWER_SUPPLY_TYPE_MAINS:
944 /* AC offline */
945 if (!ret.intval &&
946 (di->chg_info.online_chg & AC_CHG)) {
947 di->chg_info.prev_online_chg =
948 di->chg_info.online_chg;
949 di->chg_info.online_chg &= ~AC_CHG;
950 }
951 /* AC online */
952 else if (ret.intval &&
953 !(di->chg_info.online_chg & AC_CHG)) {
954 di->chg_info.prev_online_chg =
955 di->chg_info.online_chg;
956 di->chg_info.online_chg |= AC_CHG;
957 queue_delayed_work(di->chargalg_wq,
958 &di->chargalg_wd_work, 0);
959 }
960 break;
961 case POWER_SUPPLY_TYPE_USB:
962 /* USB offline */
963 if (!ret.intval &&
964 (di->chg_info.online_chg & USB_CHG)) {
965 di->chg_info.prev_online_chg =
966 di->chg_info.online_chg;
967 di->chg_info.online_chg &= ~USB_CHG;
968 }
969 /* USB online */
970 else if (ret.intval &&
971 !(di->chg_info.online_chg & USB_CHG)) {
972 di->chg_info.prev_online_chg =
973 di->chg_info.online_chg;
974 di->chg_info.online_chg |= USB_CHG;
975 queue_delayed_work(di->chargalg_wq,
976 &di->chargalg_wd_work, 0);
977 }
978 break;
979 default:
980 break;
981 }
982 break;
983
984 case POWER_SUPPLY_PROP_HEALTH:
985 switch (ext->desc->type) {
986 case POWER_SUPPLY_TYPE_BATTERY:
987 break;
988 case POWER_SUPPLY_TYPE_MAINS:
989 switch (ret.intval) {
990 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
991 di->events.mainextchnotok = true;
992 di->events.main_thermal_prot = false;
993 di->events.main_ovv = false;
994 di->events.ac_wd_expired = false;
995 break;
996 case POWER_SUPPLY_HEALTH_DEAD:
997 di->events.ac_wd_expired = true;
998 di->events.mainextchnotok = false;
999 di->events.main_ovv = false;
1000 di->events.main_thermal_prot = false;
1001 break;
1002 case POWER_SUPPLY_HEALTH_COLD:
1003 case POWER_SUPPLY_HEALTH_OVERHEAT:
1004 di->events.main_thermal_prot = true;
1005 di->events.mainextchnotok = false;
1006 di->events.main_ovv = false;
1007 di->events.ac_wd_expired = false;
1008 break;
1009 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1010 di->events.main_ovv = true;
1011 di->events.mainextchnotok = false;
1012 di->events.main_thermal_prot = false;
1013 di->events.ac_wd_expired = false;
1014 break;
1015 case POWER_SUPPLY_HEALTH_GOOD:
1016 di->events.main_thermal_prot = false;
1017 di->events.mainextchnotok = false;
1018 di->events.main_ovv = false;
1019 di->events.ac_wd_expired = false;
1020 break;
1021 default:
1022 break;
1023 }
1024 break;
1025
1026 case POWER_SUPPLY_TYPE_USB:
1027 switch (ret.intval) {
1028 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1029 di->events.usbchargernotok = true;
1030 di->events.usb_thermal_prot = false;
1031 di->events.vbus_ovv = false;
1032 di->events.usb_wd_expired = false;
1033 break;
1034 case POWER_SUPPLY_HEALTH_DEAD:
1035 di->events.usb_wd_expired = true;
1036 di->events.usbchargernotok = false;
1037 di->events.usb_thermal_prot = false;
1038 di->events.vbus_ovv = false;
1039 break;
1040 case POWER_SUPPLY_HEALTH_COLD:
1041 case POWER_SUPPLY_HEALTH_OVERHEAT:
1042 di->events.usb_thermal_prot = true;
1043 di->events.usbchargernotok = false;
1044 di->events.vbus_ovv = false;
1045 di->events.usb_wd_expired = false;
1046 break;
1047 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1048 di->events.vbus_ovv = true;
1049 di->events.usbchargernotok = false;
1050 di->events.usb_thermal_prot = false;
1051 di->events.usb_wd_expired = false;
1052 break;
1053 case POWER_SUPPLY_HEALTH_GOOD:
1054 di->events.usbchargernotok = false;
1055 di->events.usb_thermal_prot = false;
1056 di->events.vbus_ovv = false;
1057 di->events.usb_wd_expired = false;
1058 break;
1059 default:
1060 break;
1061 }
1062 break;
1063 default:
1064 break;
1065 }
1066 break;
1067
1068 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1069 switch (ext->desc->type) {
1070 case POWER_SUPPLY_TYPE_BATTERY:
1071 di->batt_data.volt_uv = ret.intval;
1072 break;
1073 case POWER_SUPPLY_TYPE_MAINS:
1074 di->chg_info.ac_volt_uv = ret.intval;
1075 break;
1076 case POWER_SUPPLY_TYPE_USB:
1077 di->chg_info.usb_volt_uv = ret.intval;
1078 break;
1079 default:
1080 break;
1081 }
1082 break;
1083
1084 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
1085 switch (ext->desc->type) {
1086 case POWER_SUPPLY_TYPE_MAINS:
1087 /* AVG is used to indicate when we are
1088 * in CV mode */
1089 if (ret.intval)
1090 di->events.ac_cv_active = true;
1091 else
1092 di->events.ac_cv_active = false;
1093
1094 break;
1095 case POWER_SUPPLY_TYPE_USB:
1096 /* AVG is used to indicate when we are
1097 * in CV mode */
1098 if (ret.intval)
1099 di->events.usb_cv_active = true;
1100 else
1101 di->events.usb_cv_active = false;
1102
1103 break;
1104 default:
1105 break;
1106 }
1107 break;
1108
1109 case POWER_SUPPLY_PROP_TECHNOLOGY:
1110 switch (ext->desc->type) {
1111 case POWER_SUPPLY_TYPE_BATTERY:
1112 if (ret.intval)
1113 di->events.batt_unknown = false;
1114 else
1115 di->events.batt_unknown = true;
1116
1117 break;
1118 default:
1119 break;
1120 }
1121 break;
1122
1123 case POWER_SUPPLY_PROP_TEMP:
1124 di->batt_data.temp = ret.intval / 10;
1125 break;
1126
1127 case POWER_SUPPLY_PROP_CURRENT_NOW:
1128 switch (ext->desc->type) {
1129 case POWER_SUPPLY_TYPE_MAINS:
1130 di->chg_info.ac_curr_ua = ret.intval;
1131 break;
1132 case POWER_SUPPLY_TYPE_USB:
1133 di->chg_info.usb_curr_ua = ret.intval;
1134 break;
1135 case POWER_SUPPLY_TYPE_BATTERY:
1136 di->batt_data.inst_curr_ua = ret.intval;
1137 break;
1138 default:
1139 break;
1140 }
1141 break;
1142
1143 case POWER_SUPPLY_PROP_CURRENT_AVG:
1144 switch (ext->desc->type) {
1145 case POWER_SUPPLY_TYPE_BATTERY:
1146 di->batt_data.avg_curr_ua = ret.intval;
1147 break;
1148 case POWER_SUPPLY_TYPE_USB:
1149 if (ret.intval)
1150 di->events.vbus_collapsed = true;
1151 else
1152 di->events.vbus_collapsed = false;
1153 break;
1154 default:
1155 break;
1156 }
1157 break;
1158 case POWER_SUPPLY_PROP_CAPACITY:
1159 if (!capacity_updated)
1160 di->batt_data.percent = ret.intval;
1161 break;
1162 default:
1163 break;
1164 }
1165 }
1166 return 0;
1167 }
1168
1169 /**
1170 * ab8500_chargalg_external_power_changed() - callback for power supply changes
1171 * @psy: pointer to the structure power_supply
1172 *
1173 * This function is the entry point of the pointer external_power_changed
1174 * of the structure power_supply.
1175 * This function gets executed when there is a change in any external power
1176 * supply that this driver needs to be notified of.
1177 */
1178 static void ab8500_chargalg_external_power_changed(struct power_supply *psy)
1179 {
1180 struct ab8500_chargalg *di = power_supply_get_drvdata(psy);
1181
1182 /*
1183 * Trigger execution of the algorithm instantly and read
1184 * all power_supply properties there instead
1185 */
1186 if (di->chargalg_wq)
1187 queue_work(di->chargalg_wq, &di->chargalg_work);
1188 }
1189
1190 /**
1191 * ab8500_chargalg_time_to_restart() - time to restart CC/CV charging?
1192 * @di: charging algorithm state
1193 *
1194 * This checks if the voltage or capacity of the battery has fallen so
1195 * low that we need to restart the CC/CV charge cycle.
1196 */
1197 static bool ab8500_chargalg_time_to_restart(struct ab8500_chargalg *di)
1198 {
1199 struct power_supply_battery_info *bi = di->bm->bi;
1200
1201 /* Sanity check - these need to have some reasonable values */
1202 if (!di->batt_data.volt_uv || !di->batt_data.percent)
1203 return false;
1204
1205 /* Some batteries tell us at which voltage we should restart charging */
1206 if (bi->charge_restart_voltage_uv > 0) {
1207 if (di->batt_data.volt_uv <= bi->charge_restart_voltage_uv)
1208 return true;
1209 /* Else we restart as we reach a certain capacity */
1210 } else {
1211 if (di->batt_data.percent <= AB8500_RECHARGE_CAP)
1212 return true;
1213 }
1214
1215 return false;
1216 }
1217
1218 /**
1219 * ab8500_chargalg_algorithm() - Main function for the algorithm
1220 * @di: pointer to the ab8500_chargalg structure
1221 *
1222 * This is the main control function for the charging algorithm.
1223 * It is called periodically or when something happens that will
1224 * trigger a state change
1225 */
1226 static void ab8500_chargalg_algorithm(struct ab8500_chargalg *di)
1227 {
1228 const struct power_supply_maintenance_charge_table *mt;
1229 struct power_supply_battery_info *bi = di->bm->bi;
1230 int charger_status;
1231 int ret;
1232
1233 /* Collect data from all power_supply class devices */
1234 power_supply_for_each_device(di->chargalg_psy, ab8500_chargalg_get_ext_psy_data);
1235
1236 ab8500_chargalg_end_of_charge(di);
1237 ab8500_chargalg_check_temp(di);
1238 ab8500_chargalg_check_charger_voltage(di);
1239
1240 charger_status = ab8500_chargalg_check_charger_connection(di);
1241
1242 if (is_ab8500(di->parent)) {
1243 ret = ab8500_chargalg_check_charger_enable(di);
1244 if (ret < 0)
1245 dev_err(di->dev, "Checking charger is enabled error"
1246 ": Returned Value %d\n", ret);
1247 }
1248
1249 /*
1250 * First check if we have a charger connected.
1251 * Also we don't allow charging of unknown batteries if configured
1252 * this way
1253 */
1254 if (!charger_status ||
1255 (di->events.batt_unknown && !di->bm->chg_unknown_bat)) {
1256 if (di->charge_state != STATE_HANDHELD) {
1257 di->events.safety_timer_expired = false;
1258 ab8500_chargalg_state_to(di, STATE_HANDHELD_INIT);
1259 }
1260 }
1261
1262 /* Safety timer expiration */
1263 else if (di->events.safety_timer_expired) {
1264 if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
1265 ab8500_chargalg_state_to(di,
1266 STATE_SAFETY_TIMER_EXPIRED_INIT);
1267 }
1268 /*
1269 * Check if any interrupts has occurred
1270 * that will prevent us from charging
1271 */
1272
1273 /* Battery removed */
1274 else if (di->events.batt_rem) {
1275 if (di->charge_state != STATE_BATT_REMOVED)
1276 ab8500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
1277 }
1278 /* Main or USB charger not ok. */
1279 else if (di->events.mainextchnotok || di->events.usbchargernotok) {
1280 /*
1281 * If vbus_collapsed is set, we have to lower the charger
1282 * current, which is done in the normal state below
1283 */
1284 if (di->charge_state != STATE_CHG_NOT_OK &&
1285 !di->events.vbus_collapsed)
1286 ab8500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
1287 }
1288 /* VBUS, Main or VBAT OVV. */
1289 else if (di->events.vbus_ovv ||
1290 di->events.main_ovv ||
1291 di->events.batt_ovv ||
1292 !di->chg_info.usb_chg_ok ||
1293 !di->chg_info.ac_chg_ok) {
1294 if (di->charge_state != STATE_OVV_PROTECT)
1295 ab8500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
1296 }
1297 /* USB Thermal, stop charging */
1298 else if (di->events.main_thermal_prot ||
1299 di->events.usb_thermal_prot) {
1300 if (di->charge_state != STATE_HW_TEMP_PROTECT)
1301 ab8500_chargalg_state_to(di,
1302 STATE_HW_TEMP_PROTECT_INIT);
1303 }
1304 /* Battery temp over/under */
1305 else if (di->events.btemp_underover) {
1306 if (di->charge_state != STATE_TEMP_UNDEROVER)
1307 ab8500_chargalg_state_to(di,
1308 STATE_TEMP_UNDEROVER_INIT);
1309 }
1310 /* Watchdog expired */
1311 else if (di->events.ac_wd_expired ||
1312 di->events.usb_wd_expired) {
1313 if (di->charge_state != STATE_WD_EXPIRED)
1314 ab8500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
1315 }
1316 /* Battery temp high/low */
1317 else if (di->events.btemp_low || di->events.btemp_high) {
1318 if (di->charge_state != STATE_TEMP_LOWHIGH)
1319 ab8500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
1320 }
1321
1322 dev_dbg(di->dev,
1323 "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
1324 "State %s Active_chg %d Chg_status %d AC %d USB %d "
1325 "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
1326 "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
1327 di->batt_data.volt_uv,
1328 di->batt_data.avg_curr_ua,
1329 di->batt_data.inst_curr_ua,
1330 di->batt_data.temp,
1331 di->batt_data.percent,
1332 di->maintenance_chg,
1333 states[di->charge_state],
1334 di->chg_info.charger_type,
1335 di->charge_status,
1336 di->chg_info.conn_chg & AC_CHG,
1337 di->chg_info.conn_chg & USB_CHG,
1338 di->chg_info.online_chg & AC_CHG,
1339 di->chg_info.online_chg & USB_CHG,
1340 di->events.ac_cv_active,
1341 di->events.usb_cv_active,
1342 di->chg_info.ac_curr_ua,
1343 di->chg_info.usb_curr_ua,
1344 di->chg_info.ac_vset_uv,
1345 di->chg_info.ac_iset_ua,
1346 di->chg_info.usb_vset_uv,
1347 di->chg_info.usb_iset_ua);
1348
1349 switch (di->charge_state) {
1350 case STATE_HANDHELD_INIT:
1351 ab8500_chargalg_stop_charging(di);
1352 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
1353 ab8500_chargalg_state_to(di, STATE_HANDHELD);
1354 fallthrough;
1355
1356 case STATE_HANDHELD:
1357 break;
1358
1359 case STATE_BATT_REMOVED_INIT:
1360 ab8500_chargalg_stop_charging(di);
1361 ab8500_chargalg_state_to(di, STATE_BATT_REMOVED);
1362 fallthrough;
1363
1364 case STATE_BATT_REMOVED:
1365 if (!di->events.batt_rem)
1366 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1367 break;
1368
1369 case STATE_HW_TEMP_PROTECT_INIT:
1370 ab8500_chargalg_stop_charging(di);
1371 ab8500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
1372 fallthrough;
1373
1374 case STATE_HW_TEMP_PROTECT:
1375 if (!di->events.main_thermal_prot &&
1376 !di->events.usb_thermal_prot)
1377 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1378 break;
1379
1380 case STATE_OVV_PROTECT_INIT:
1381 ab8500_chargalg_stop_charging(di);
1382 ab8500_chargalg_state_to(di, STATE_OVV_PROTECT);
1383 fallthrough;
1384
1385 case STATE_OVV_PROTECT:
1386 if (!di->events.vbus_ovv &&
1387 !di->events.main_ovv &&
1388 !di->events.batt_ovv &&
1389 di->chg_info.usb_chg_ok &&
1390 di->chg_info.ac_chg_ok)
1391 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1392 break;
1393
1394 case STATE_CHG_NOT_OK_INIT:
1395 ab8500_chargalg_stop_charging(di);
1396 ab8500_chargalg_state_to(di, STATE_CHG_NOT_OK);
1397 fallthrough;
1398
1399 case STATE_CHG_NOT_OK:
1400 if (!di->events.mainextchnotok &&
1401 !di->events.usbchargernotok)
1402 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1403 break;
1404
1405 case STATE_SAFETY_TIMER_EXPIRED_INIT:
1406 ab8500_chargalg_stop_charging(di);
1407 ab8500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
1408 fallthrough;
1409
1410 case STATE_SAFETY_TIMER_EXPIRED:
1411 /* We exit this state when charger is removed */
1412 break;
1413
1414 case STATE_NORMAL_INIT:
1415 if (bi->constant_charge_current_max_ua == 0)
1416 /* "charging" with 0 uA */
1417 ab8500_chargalg_stop_charging(di);
1418 else {
1419 ab8500_chargalg_start_charging(di,
1420 bi->constant_charge_voltage_max_uv,
1421 bi->constant_charge_current_max_ua);
1422 }
1423
1424 ab8500_chargalg_state_to(di, STATE_NORMAL);
1425 ab8500_chargalg_start_safety_timer(di);
1426 ab8500_chargalg_stop_maintenance_timer(di);
1427 init_maxim_chg_curr(di);
1428 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1429 di->eoc_cnt = 0;
1430 di->maintenance_chg = false;
1431 power_supply_changed(di->chargalg_psy);
1432
1433 break;
1434
1435 case STATE_NORMAL:
1436 handle_maxim_chg_curr(di);
1437 if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
1438 di->maintenance_chg) {
1439 /*
1440 * The battery is fully charged, check if we support
1441 * maintenance charging else go back to waiting for
1442 * the recharge voltage limit.
1443 */
1444 if (!power_supply_supports_maintenance_charging(bi))
1445 ab8500_chargalg_state_to(di,
1446 STATE_WAIT_FOR_RECHARGE_INIT);
1447 else
1448 ab8500_chargalg_state_to(di,
1449 STATE_MAINTENANCE_A_INIT);
1450 }
1451 break;
1452
1453 /* This state will be used when the maintenance state is disabled */
1454 case STATE_WAIT_FOR_RECHARGE_INIT:
1455 ab8500_chargalg_hold_charging(di);
1456 ab8500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
1457 fallthrough;
1458
1459 case STATE_WAIT_FOR_RECHARGE:
1460 if (ab8500_chargalg_time_to_restart(di))
1461 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1462 break;
1463
1464 case STATE_MAINTENANCE_A_INIT:
1465 mt = power_supply_get_maintenance_charging_setting(bi, 0);
1466 if (!mt) {
1467 /* No maintenance A state, go back to normal */
1468 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1469 power_supply_changed(di->chargalg_psy);
1470 break;
1471 }
1472 ab8500_chargalg_stop_safety_timer(di);
1473 ab8500_chargalg_start_maintenance_timer(di,
1474 mt->charge_safety_timer_minutes);
1475 ab8500_chargalg_start_charging(di,
1476 mt->charge_voltage_max_uv,
1477 mt->charge_current_max_ua);
1478 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_A);
1479 power_supply_changed(di->chargalg_psy);
1480 fallthrough;
1481
1482 case STATE_MAINTENANCE_A:
1483 if (di->events.maintenance_timer_expired) {
1484 ab8500_chargalg_stop_maintenance_timer(di);
1485 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
1486 }
1487 /*
1488 * This happens if the voltage drops too quickly during
1489 * maintenance charging, especially in older batteries.
1490 */
1491 if (ab8500_chargalg_time_to_restart(di)) {
1492 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1493 dev_info(di->dev, "restarted charging from maintenance state A - battery getting old?\n");
1494 }
1495 break;
1496
1497 case STATE_MAINTENANCE_B_INIT:
1498 mt = power_supply_get_maintenance_charging_setting(bi, 1);
1499 if (!mt) {
1500 /* No maintenance B state, go back to normal */
1501 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1502 power_supply_changed(di->chargalg_psy);
1503 break;
1504 }
1505 ab8500_chargalg_start_maintenance_timer(di,
1506 mt->charge_safety_timer_minutes);
1507 ab8500_chargalg_start_charging(di,
1508 mt->charge_voltage_max_uv,
1509 mt->charge_current_max_ua);
1510 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B);
1511 power_supply_changed(di->chargalg_psy);
1512 fallthrough;
1513
1514 case STATE_MAINTENANCE_B:
1515 if (di->events.maintenance_timer_expired) {
1516 ab8500_chargalg_stop_maintenance_timer(di);
1517 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1518 }
1519 /*
1520 * This happens if the voltage drops too quickly during
1521 * maintenance charging, especially in older batteries.
1522 */
1523 if (ab8500_chargalg_time_to_restart(di)) {
1524 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1525 dev_info(di->dev, "restarted charging from maintenance state B - battery getting old?\n");
1526 }
1527 break;
1528
1529 case STATE_TEMP_LOWHIGH_INIT:
1530 if (di->events.btemp_low) {
1531 ab8500_chargalg_start_charging(di,
1532 bi->alert_low_temp_charge_voltage_uv,
1533 bi->alert_low_temp_charge_current_ua);
1534 } else if (di->events.btemp_high) {
1535 ab8500_chargalg_start_charging(di,
1536 bi->alert_high_temp_charge_voltage_uv,
1537 bi->alert_high_temp_charge_current_ua);
1538 } else {
1539 dev_err(di->dev, "neither low or high temp event occurred\n");
1540 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1541 break;
1542 }
1543 ab8500_chargalg_stop_maintenance_timer(di);
1544 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1545 ab8500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
1546 power_supply_changed(di->chargalg_psy);
1547 fallthrough;
1548
1549 case STATE_TEMP_LOWHIGH:
1550 if (!di->events.btemp_low && !di->events.btemp_high)
1551 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1552 break;
1553
1554 case STATE_WD_EXPIRED_INIT:
1555 ab8500_chargalg_stop_charging(di);
1556 ab8500_chargalg_state_to(di, STATE_WD_EXPIRED);
1557 fallthrough;
1558
1559 case STATE_WD_EXPIRED:
1560 if (!di->events.ac_wd_expired &&
1561 !di->events.usb_wd_expired)
1562 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1563 break;
1564
1565 case STATE_TEMP_UNDEROVER_INIT:
1566 ab8500_chargalg_stop_charging(di);
1567 ab8500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
1568 fallthrough;
1569
1570 case STATE_TEMP_UNDEROVER:
1571 if (!di->events.btemp_underover)
1572 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1573 break;
1574 }
1575
1576 /* Start charging directly if the new state is a charge state */
1577 if (di->charge_state == STATE_NORMAL_INIT ||
1578 di->charge_state == STATE_MAINTENANCE_A_INIT ||
1579 di->charge_state == STATE_MAINTENANCE_B_INIT)
1580 queue_work(di->chargalg_wq, &di->chargalg_work);
1581 }
1582
1583 /**
1584 * ab8500_chargalg_periodic_work() - Periodic work for the algorithm
1585 * @work: pointer to the work_struct structure
1586 *
1587 * Work queue function for the charging algorithm
1588 */
1589 static void ab8500_chargalg_periodic_work(struct work_struct *work)
1590 {
1591 struct ab8500_chargalg *di = container_of(work,
1592 struct ab8500_chargalg, chargalg_periodic_work.work);
1593
1594 ab8500_chargalg_algorithm(di);
1595
1596 /*
1597 * If a charger is connected then the battery has to be monitored
1598 * frequently, else the work can be delayed.
1599 */
1600 if (di->chg_info.conn_chg)
1601 queue_delayed_work(di->chargalg_wq,
1602 &di->chargalg_periodic_work,
1603 di->bm->interval_charging * HZ);
1604 else
1605 queue_delayed_work(di->chargalg_wq,
1606 &di->chargalg_periodic_work,
1607 di->bm->interval_not_charging * HZ);
1608 }
1609
1610 /**
1611 * ab8500_chargalg_wd_work() - periodic work to kick the charger watchdog
1612 * @work: pointer to the work_struct structure
1613 *
1614 * Work queue function for kicking the charger watchdog
1615 */
1616 static void ab8500_chargalg_wd_work(struct work_struct *work)
1617 {
1618 int ret;
1619 struct ab8500_chargalg *di = container_of(work,
1620 struct ab8500_chargalg, chargalg_wd_work.work);
1621
1622 ret = ab8500_chargalg_kick_watchdog(di);
1623 if (ret < 0)
1624 dev_err(di->dev, "failed to kick watchdog\n");
1625
1626 queue_delayed_work(di->chargalg_wq,
1627 &di->chargalg_wd_work, CHG_WD_INTERVAL);
1628 }
1629
1630 /**
1631 * ab8500_chargalg_work() - Work to run the charging algorithm instantly
1632 * @work: pointer to the work_struct structure
1633 *
1634 * Work queue function for calling the charging algorithm
1635 */
1636 static void ab8500_chargalg_work(struct work_struct *work)
1637 {
1638 struct ab8500_chargalg *di = container_of(work,
1639 struct ab8500_chargalg, chargalg_work);
1640
1641 ab8500_chargalg_algorithm(di);
1642 }
1643
1644 /**
1645 * ab8500_chargalg_get_property() - get the chargalg properties
1646 * @psy: pointer to the power_supply structure
1647 * @psp: pointer to the power_supply_property structure
1648 * @val: pointer to the power_supply_propval union
1649 *
1650 * This function gets called when an application tries to get the
1651 * chargalg properties by reading the sysfs files.
1652 * status: charging/discharging/full/unknown
1653 * health: health of the battery
1654 * Returns error code in case of failure else 0 on success
1655 */
1656 static int ab8500_chargalg_get_property(struct power_supply *psy,
1657 enum power_supply_property psp,
1658 union power_supply_propval *val)
1659 {
1660 struct ab8500_chargalg *di = power_supply_get_drvdata(psy);
1661
1662 switch (psp) {
1663 case POWER_SUPPLY_PROP_STATUS:
1664 val->intval = di->charge_status;
1665 break;
1666 case POWER_SUPPLY_PROP_HEALTH:
1667 if (di->events.batt_ovv) {
1668 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
1669 } else if (di->events.btemp_underover) {
1670 if (di->batt_data.temp <= di->bm->bi->temp_min)
1671 val->intval = POWER_SUPPLY_HEALTH_COLD;
1672 else
1673 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
1674 } else if (di->charge_state == STATE_SAFETY_TIMER_EXPIRED ||
1675 di->charge_state == STATE_SAFETY_TIMER_EXPIRED_INIT) {
1676 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
1677 } else {
1678 val->intval = POWER_SUPPLY_HEALTH_GOOD;
1679 }
1680 break;
1681 default:
1682 return -EINVAL;
1683 }
1684 return 0;
1685 }
1686
1687 static int __maybe_unused ab8500_chargalg_resume(struct device *dev)
1688 {
1689 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1690
1691 /* Kick charger watchdog if charging (any charger online) */
1692 if (di->chg_info.online_chg)
1693 queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
1694
1695 /*
1696 * Run the charging algorithm directly to be sure we don't
1697 * do it too seldom
1698 */
1699 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1700
1701 return 0;
1702 }
1703
1704 static int __maybe_unused ab8500_chargalg_suspend(struct device *dev)
1705 {
1706 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1707
1708 if (di->chg_info.online_chg)
1709 cancel_delayed_work_sync(&di->chargalg_wd_work);
1710
1711 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1712
1713 return 0;
1714 }
1715
1716 static char *supply_interface[] = {
1717 "ab8500_fg",
1718 };
1719
1720 static const struct power_supply_desc ab8500_chargalg_desc = {
1721 .name = "ab8500_chargalg",
1722 .type = POWER_SUPPLY_TYPE_UNKNOWN,
1723 .properties = ab8500_chargalg_props,
1724 .num_properties = ARRAY_SIZE(ab8500_chargalg_props),
1725 .get_property = ab8500_chargalg_get_property,
1726 .external_power_changed = ab8500_chargalg_external_power_changed,
1727 };
1728
1729 static int ab8500_chargalg_bind(struct device *dev, struct device *master,
1730 void *data)
1731 {
1732 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1733
1734 /* Create a work queue for the chargalg */
1735 di->chargalg_wq = alloc_ordered_workqueue("ab8500_chargalg_wq",
1736 WQ_MEM_RECLAIM);
1737 if (di->chargalg_wq == NULL) {
1738 dev_err(di->dev, "failed to create work queue\n");
1739 return -ENOMEM;
1740 }
1741
1742 /* Run the charging algorithm */
1743 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1744
1745 return 0;
1746 }
1747
1748 static void ab8500_chargalg_unbind(struct device *dev, struct device *master,
1749 void *data)
1750 {
1751 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1752
1753 /* Stop all timers and work */
1754 hrtimer_cancel(&di->safety_timer);
1755 hrtimer_cancel(&di->maintenance_timer);
1756
1757 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1758 cancel_delayed_work_sync(&di->chargalg_wd_work);
1759 cancel_work_sync(&di->chargalg_work);
1760
1761 /* Delete the work queue */
1762 destroy_workqueue(di->chargalg_wq);
1763 }
1764
1765 static const struct component_ops ab8500_chargalg_component_ops = {
1766 .bind = ab8500_chargalg_bind,
1767 .unbind = ab8500_chargalg_unbind,
1768 };
1769
1770 static int ab8500_chargalg_probe(struct platform_device *pdev)
1771 {
1772 struct device *dev = &pdev->dev;
1773 struct power_supply_config psy_cfg = {};
1774 struct ab8500_chargalg *di;
1775
1776 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
1777 if (!di)
1778 return -ENOMEM;
1779
1780 di->bm = &ab8500_bm_data;
1781
1782 /* get device struct and parent */
1783 di->dev = dev;
1784 di->parent = dev_get_drvdata(pdev->dev.parent);
1785
1786 psy_cfg.supplied_to = supply_interface;
1787 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
1788 psy_cfg.drv_data = di;
1789
1790 /* Initilialize safety timer */
1791 hrtimer_init(&di->safety_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1792 di->safety_timer.function = ab8500_chargalg_safety_timer_expired;
1793
1794 /* Initilialize maintenance timer */
1795 hrtimer_init(&di->maintenance_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1796 di->maintenance_timer.function =
1797 ab8500_chargalg_maintenance_timer_expired;
1798
1799 /* Init work for chargalg */
1800 INIT_DEFERRABLE_WORK(&di->chargalg_periodic_work,
1801 ab8500_chargalg_periodic_work);
1802 INIT_DEFERRABLE_WORK(&di->chargalg_wd_work,
1803 ab8500_chargalg_wd_work);
1804
1805 /* Init work for chargalg */
1806 INIT_WORK(&di->chargalg_work, ab8500_chargalg_work);
1807
1808 /* To detect charger at startup */
1809 di->chg_info.prev_conn_chg = -1;
1810
1811 /* Register chargalg power supply class */
1812 di->chargalg_psy = devm_power_supply_register(di->dev,
1813 &ab8500_chargalg_desc,
1814 &psy_cfg);
1815 if (IS_ERR(di->chargalg_psy)) {
1816 dev_err(di->dev, "failed to register chargalg psy\n");
1817 return PTR_ERR(di->chargalg_psy);
1818 }
1819
1820 platform_set_drvdata(pdev, di);
1821
1822 dev_info(di->dev, "probe success\n");
1823 return component_add(dev, &ab8500_chargalg_component_ops);
1824 }
1825
1826 static void ab8500_chargalg_remove(struct platform_device *pdev)
1827 {
1828 component_del(&pdev->dev, &ab8500_chargalg_component_ops);
1829 }
1830
1831 static SIMPLE_DEV_PM_OPS(ab8500_chargalg_pm_ops, ab8500_chargalg_suspend, ab8500_chargalg_resume);
1832
1833 static const struct of_device_id ab8500_chargalg_match[] = {
1834 { .compatible = "stericsson,ab8500-chargalg", },
1835 { },
1836 };
1837
1838 struct platform_driver ab8500_chargalg_driver = {
1839 .probe = ab8500_chargalg_probe,
1840 .remove = ab8500_chargalg_remove,
1841 .driver = {
1842 .name = "ab8500_chargalg",
1843 .of_match_table = ab8500_chargalg_match,
1844 .pm = &ab8500_chargalg_pm_ops,
1845 },
1846 };
1847 MODULE_LICENSE("GPL v2");
1848 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
1849 MODULE_ALIAS("platform:ab8500-chargalg");
1850 MODULE_DESCRIPTION("ab8500 battery charging algorithm");
Kernel DRM miscellaneous fixes and cross-tree changes