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 abx500 variants
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/hrtimer.h>
19 #include <linux/interrupt.h>
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 #include <linux/platform_device.h>
23 #include <linux/power_supply.h>
24 #include <linux/completion.h>
25 #include <linux/workqueue.h>
26 #include <linux/kobject.h>
27 #include <linux/of.h>
28 #include <linux/mfd/core.h>
29 #include <linux/mfd/abx500.h>
30 #include <linux/mfd/abx500/ab8500.h>
31 #include <linux/notifier.h>
32
33 #include "ab8500-bm.h"
34 #include "ab8500-chargalg.h"
35
36 /* Watchdog kick interval */
37 #define CHG_WD_INTERVAL (6 * HZ)
38
39 /* End-of-charge criteria counter */
40 #define EOC_COND_CNT 10
41
42 /* One hour expressed in seconds */
43 #define ONE_HOUR_IN_SECONDS 3600
44
45 /* Five minutes expressed in seconds */
46 #define FIVE_MINUTES_IN_SECONDS 300
47
48 #define CHARGALG_CURR_STEP_LOW 0
49 #define CHARGALG_CURR_STEP_HIGH 100
50
51 enum abx500_chargers {
52 NO_CHG,
53 AC_CHG,
54 USB_CHG,
55 };
56
57 struct abx500_chargalg_charger_info {
58 enum abx500_chargers conn_chg;
59 enum abx500_chargers prev_conn_chg;
60 enum abx500_chargers online_chg;
61 enum abx500_chargers prev_online_chg;
62 enum abx500_chargers charger_type;
63 bool usb_chg_ok;
64 bool ac_chg_ok;
65 int usb_volt;
66 int usb_curr;
67 int ac_volt;
68 int ac_curr;
69 int usb_vset;
70 int usb_iset;
71 int ac_vset;
72 int ac_iset;
73 };
74
75 struct abx500_chargalg_suspension_status {
76 bool suspended_change;
77 bool ac_suspended;
78 bool usb_suspended;
79 };
80
81 struct abx500_chargalg_current_step_status {
82 bool curr_step_change;
83 int curr_step;
84 };
85
86 struct abx500_chargalg_battery_data {
87 int temp;
88 int volt;
89 int avg_curr;
90 int inst_curr;
91 int percent;
92 };
93
94 enum abx500_chargalg_states {
95 STATE_HANDHELD_INIT,
96 STATE_HANDHELD,
97 STATE_CHG_NOT_OK_INIT,
98 STATE_CHG_NOT_OK,
99 STATE_HW_TEMP_PROTECT_INIT,
100 STATE_HW_TEMP_PROTECT,
101 STATE_NORMAL_INIT,
102 STATE_NORMAL,
103 STATE_WAIT_FOR_RECHARGE_INIT,
104 STATE_WAIT_FOR_RECHARGE,
105 STATE_MAINTENANCE_A_INIT,
106 STATE_MAINTENANCE_A,
107 STATE_MAINTENANCE_B_INIT,
108 STATE_MAINTENANCE_B,
109 STATE_TEMP_UNDEROVER_INIT,
110 STATE_TEMP_UNDEROVER,
111 STATE_TEMP_LOWHIGH_INIT,
112 STATE_TEMP_LOWHIGH,
113 STATE_SUSPENDED_INIT,
114 STATE_SUSPENDED,
115 STATE_OVV_PROTECT_INIT,
116 STATE_OVV_PROTECT,
117 STATE_SAFETY_TIMER_EXPIRED_INIT,
118 STATE_SAFETY_TIMER_EXPIRED,
119 STATE_BATT_REMOVED_INIT,
120 STATE_BATT_REMOVED,
121 STATE_WD_EXPIRED_INIT,
122 STATE_WD_EXPIRED,
123 };
124
125 static const char *states[] = {
126 "HANDHELD_INIT",
127 "HANDHELD",
128 "CHG_NOT_OK_INIT",
129 "CHG_NOT_OK",
130 "HW_TEMP_PROTECT_INIT",
131 "HW_TEMP_PROTECT",
132 "NORMAL_INIT",
133 "NORMAL",
134 "WAIT_FOR_RECHARGE_INIT",
135 "WAIT_FOR_RECHARGE",
136 "MAINTENANCE_A_INIT",
137 "MAINTENANCE_A",
138 "MAINTENANCE_B_INIT",
139 "MAINTENANCE_B",
140 "TEMP_UNDEROVER_INIT",
141 "TEMP_UNDEROVER",
142 "TEMP_LOWHIGH_INIT",
143 "TEMP_LOWHIGH",
144 "SUSPENDED_INIT",
145 "SUSPENDED",
146 "OVV_PROTECT_INIT",
147 "OVV_PROTECT",
148 "SAFETY_TIMER_EXPIRED_INIT",
149 "SAFETY_TIMER_EXPIRED",
150 "BATT_REMOVED_INIT",
151 "BATT_REMOVED",
152 "WD_EXPIRED_INIT",
153 "WD_EXPIRED",
154 };
155
156 struct abx500_chargalg_events {
157 bool batt_unknown;
158 bool mainextchnotok;
159 bool batt_ovv;
160 bool batt_rem;
161 bool btemp_underover;
162 bool btemp_lowhigh;
163 bool main_thermal_prot;
164 bool usb_thermal_prot;
165 bool main_ovv;
166 bool vbus_ovv;
167 bool usbchargernotok;
168 bool safety_timer_expired;
169 bool maintenance_timer_expired;
170 bool ac_wd_expired;
171 bool usb_wd_expired;
172 bool ac_cv_active;
173 bool usb_cv_active;
174 bool vbus_collapsed;
175 };
176
177 /**
178 * struct abx500_charge_curr_maximization - Charger maximization parameters
179 * @original_iset: the non optimized/maximised charger current
180 * @current_iset: the charging current used at this moment
181 * @test_delta_i: the delta between the current we want to charge and the
182 current that is really going into the battery
183 * @condition_cnt: number of iterations needed before a new charger current
184 is set
185 * @max_current: maximum charger current
186 * @wait_cnt: to avoid too fast current step down in case of charger
187 * voltage collapse, we insert this delay between step
188 * down
189 * @level: tells in how many steps the charging current has been
190 increased
191 */
192 struct abx500_charge_curr_maximization {
193 int original_iset;
194 int current_iset;
195 int test_delta_i;
196 int condition_cnt;
197 int max_current;
198 int wait_cnt;
199 u8 level;
200 };
201
202 enum maxim_ret {
203 MAXIM_RET_NOACTION,
204 MAXIM_RET_CHANGE,
205 MAXIM_RET_IBAT_TOO_HIGH,
206 };
207
208 /**
209 * struct abx500_chargalg - abx500 Charging algorithm device information
210 * @dev: pointer to the structure device
211 * @charge_status: battery operating status
212 * @eoc_cnt: counter used to determine end-of_charge
213 * @maintenance_chg: indicate if maintenance charge is active
214 * @t_hyst_norm temperature hysteresis when the temperature has been
215 * over or under normal limits
216 * @t_hyst_lowhigh temperature hysteresis when the temperature has been
217 * over or under the high or low limits
218 * @charge_state: current state of the charging algorithm
219 * @ccm charging current maximization parameters
220 * @chg_info: information about connected charger types
221 * @batt_data: data of the battery
222 * @susp_status: current charger suspension status
223 * @bm: Platform specific battery management information
224 * @curr_status: Current step status for over-current protection
225 * @parent: pointer to the struct abx500
226 * @chargalg_psy: structure that holds the battery properties exposed by
227 * the charging algorithm
228 * @events: structure for information about events triggered
229 * @chargalg_wq: work queue for running the charging algorithm
230 * @chargalg_periodic_work: work to run the charging algorithm periodically
231 * @chargalg_wd_work: work to kick the charger watchdog periodically
232 * @chargalg_work: work to run the charging algorithm instantly
233 * @safety_timer: charging safety timer
234 * @maintenance_timer: maintenance charging timer
235 * @chargalg_kobject: structure of type kobject
236 */
237 struct abx500_chargalg {
238 struct device *dev;
239 int charge_status;
240 int eoc_cnt;
241 bool maintenance_chg;
242 int t_hyst_norm;
243 int t_hyst_lowhigh;
244 enum abx500_chargalg_states charge_state;
245 struct abx500_charge_curr_maximization ccm;
246 struct abx500_chargalg_charger_info chg_info;
247 struct abx500_chargalg_battery_data batt_data;
248 struct abx500_chargalg_suspension_status susp_status;
249 struct ab8500 *parent;
250 struct abx500_chargalg_current_step_status curr_status;
251 struct abx500_bm_data *bm;
252 struct power_supply *chargalg_psy;
253 struct ux500_charger *ac_chg;
254 struct ux500_charger *usb_chg;
255 struct abx500_chargalg_events events;
256 struct workqueue_struct *chargalg_wq;
257 struct delayed_work chargalg_periodic_work;
258 struct delayed_work chargalg_wd_work;
259 struct work_struct chargalg_work;
260 struct hrtimer safety_timer;
261 struct hrtimer maintenance_timer;
262 struct kobject chargalg_kobject;
263 };
264
265 /*External charger prepare notifier*/
266 BLOCKING_NOTIFIER_HEAD(charger_notifier_list);
267
268 /* Main battery properties */
269 static enum power_supply_property abx500_chargalg_props[] = {
270 POWER_SUPPLY_PROP_STATUS,
271 POWER_SUPPLY_PROP_HEALTH,
272 };
273
274 struct abx500_chargalg_sysfs_entry {
275 struct attribute attr;
276 ssize_t (*show)(struct abx500_chargalg *, char *);
277 ssize_t (*store)(struct abx500_chargalg *, const char *, size_t);
278 };
279
280 /**
281 * abx500_chargalg_safety_timer_expired() - Expiration of the safety timer
282 * @timer: pointer to the hrtimer structure
283 *
284 * This function gets called when the safety timer for the charger
285 * expires
286 */
287 static enum hrtimer_restart
abx500_chargalg_safety_timer_expired(struct hrtimer * timer)288 abx500_chargalg_safety_timer_expired(struct hrtimer *timer)
289 {
290 struct abx500_chargalg *di = container_of(timer, struct abx500_chargalg,
291 safety_timer);
292 dev_err(di->dev, "Safety timer expired\n");
293 di->events.safety_timer_expired = true;
294
295 /* Trigger execution of the algorithm instantly */
296 queue_work(di->chargalg_wq, &di->chargalg_work);
297
298 return HRTIMER_NORESTART;
299 }
300
301 /**
302 * abx500_chargalg_maintenance_timer_expired() - Expiration of
303 * the maintenance timer
304 * @timer: pointer to the timer structure
305 *
306 * This function gets called when the maintenence timer
307 * expires
308 */
309 static enum hrtimer_restart
abx500_chargalg_maintenance_timer_expired(struct hrtimer * timer)310 abx500_chargalg_maintenance_timer_expired(struct hrtimer *timer)
311 {
312
313 struct abx500_chargalg *di = container_of(timer, struct abx500_chargalg,
314 maintenance_timer);
315
316 dev_dbg(di->dev, "Maintenance timer expired\n");
317 di->events.maintenance_timer_expired = true;
318
319 /* Trigger execution of the algorithm instantly */
320 queue_work(di->chargalg_wq, &di->chargalg_work);
321
322 return HRTIMER_NORESTART;
323 }
324
325 /**
326 * abx500_chargalg_state_to() - Change charge state
327 * @di: pointer to the abx500_chargalg structure
328 *
329 * This function gets called when a charge state change should occur
330 */
abx500_chargalg_state_to(struct abx500_chargalg * di,enum abx500_chargalg_states state)331 static void abx500_chargalg_state_to(struct abx500_chargalg *di,
332 enum abx500_chargalg_states state)
333 {
334 dev_dbg(di->dev,
335 "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
336 di->charge_state == state ? "NO" : "YES",
337 di->charge_state,
338 states[di->charge_state],
339 state,
340 states[state]);
341
342 di->charge_state = state;
343 }
344
abx500_chargalg_check_charger_enable(struct abx500_chargalg * di)345 static int abx500_chargalg_check_charger_enable(struct abx500_chargalg *di)
346 {
347 switch (di->charge_state) {
348 case STATE_NORMAL:
349 case STATE_MAINTENANCE_A:
350 case STATE_MAINTENANCE_B:
351 break;
352 default:
353 return 0;
354 }
355
356 if (di->chg_info.charger_type & USB_CHG) {
357 return di->usb_chg->ops.check_enable(di->usb_chg,
358 di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
359 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
360 } else if ((di->chg_info.charger_type & AC_CHG) &&
361 !(di->ac_chg->external)) {
362 return di->ac_chg->ops.check_enable(di->ac_chg,
363 di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
364 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
365 }
366 return 0;
367 }
368
369 /**
370 * abx500_chargalg_check_charger_connection() - Check charger connection change
371 * @di: pointer to the abx500_chargalg structure
372 *
373 * This function will check if there is a change in the charger connection
374 * and change charge state accordingly. AC has precedence over USB.
375 */
abx500_chargalg_check_charger_connection(struct abx500_chargalg * di)376 static int abx500_chargalg_check_charger_connection(struct abx500_chargalg *di)
377 {
378 if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg ||
379 di->susp_status.suspended_change) {
380 /*
381 * Charger state changed or suspension
382 * has changed since last update
383 */
384 if ((di->chg_info.conn_chg & AC_CHG) &&
385 !di->susp_status.ac_suspended) {
386 dev_dbg(di->dev, "Charging source is AC\n");
387 if (di->chg_info.charger_type != AC_CHG) {
388 di->chg_info.charger_type = AC_CHG;
389 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
390 }
391 } else if ((di->chg_info.conn_chg & USB_CHG) &&
392 !di->susp_status.usb_suspended) {
393 dev_dbg(di->dev, "Charging source is USB\n");
394 di->chg_info.charger_type = USB_CHG;
395 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
396 } else if (di->chg_info.conn_chg &&
397 (di->susp_status.ac_suspended ||
398 di->susp_status.usb_suspended)) {
399 dev_dbg(di->dev, "Charging is suspended\n");
400 di->chg_info.charger_type = NO_CHG;
401 abx500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
402 } else {
403 dev_dbg(di->dev, "Charging source is OFF\n");
404 di->chg_info.charger_type = NO_CHG;
405 abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
406 }
407 di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
408 di->susp_status.suspended_change = false;
409 }
410 return di->chg_info.conn_chg;
411 }
412
413 /**
414 * abx500_chargalg_check_current_step_status() - Check charging current
415 * step status.
416 * @di: pointer to the abx500_chargalg structure
417 *
418 * This function will check if there is a change in the charging current step
419 * and change charge state accordingly.
420 */
abx500_chargalg_check_current_step_status(struct abx500_chargalg * di)421 static void abx500_chargalg_check_current_step_status
422 (struct abx500_chargalg *di)
423 {
424 if (di->curr_status.curr_step_change)
425 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
426 di->curr_status.curr_step_change = false;
427 }
428
429 /**
430 * abx500_chargalg_start_safety_timer() - Start charging safety timer
431 * @di: pointer to the abx500_chargalg structure
432 *
433 * The safety timer is used to avoid overcharging of old or bad batteries.
434 * There are different timers for AC and USB
435 */
abx500_chargalg_start_safety_timer(struct abx500_chargalg * di)436 static void abx500_chargalg_start_safety_timer(struct abx500_chargalg *di)
437 {
438 /* Charger-dependent expiration time in hours*/
439 int timer_expiration = 0;
440
441 switch (di->chg_info.charger_type) {
442 case AC_CHG:
443 timer_expiration = di->bm->main_safety_tmr_h;
444 break;
445
446 case USB_CHG:
447 timer_expiration = di->bm->usb_safety_tmr_h;
448 break;
449
450 default:
451 dev_err(di->dev, "Unknown charger to charge from\n");
452 break;
453 }
454
455 di->events.safety_timer_expired = false;
456 hrtimer_set_expires_range(&di->safety_timer,
457 ktime_set(timer_expiration * ONE_HOUR_IN_SECONDS, 0),
458 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
459 hrtimer_start_expires(&di->safety_timer, HRTIMER_MODE_REL);
460 }
461
462 /**
463 * abx500_chargalg_stop_safety_timer() - Stop charging safety timer
464 * @di: pointer to the abx500_chargalg structure
465 *
466 * The safety timer is stopped whenever the NORMAL state is exited
467 */
abx500_chargalg_stop_safety_timer(struct abx500_chargalg * di)468 static void abx500_chargalg_stop_safety_timer(struct abx500_chargalg *di)
469 {
470 if (hrtimer_try_to_cancel(&di->safety_timer) >= 0)
471 di->events.safety_timer_expired = false;
472 }
473
474 /**
475 * abx500_chargalg_start_maintenance_timer() - Start charging maintenance timer
476 * @di: pointer to the abx500_chargalg structure
477 * @duration: duration of ther maintenance timer in hours
478 *
479 * The maintenance timer is used to maintain the charge in the battery once
480 * the battery is considered full. These timers are chosen to match the
481 * discharge curve of the battery
482 */
abx500_chargalg_start_maintenance_timer(struct abx500_chargalg * di,int duration)483 static void abx500_chargalg_start_maintenance_timer(struct abx500_chargalg *di,
484 int duration)
485 {
486 hrtimer_set_expires_range(&di->maintenance_timer,
487 ktime_set(duration * ONE_HOUR_IN_SECONDS, 0),
488 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
489 di->events.maintenance_timer_expired = false;
490 hrtimer_start_expires(&di->maintenance_timer, HRTIMER_MODE_REL);
491 }
492
493 /**
494 * abx500_chargalg_stop_maintenance_timer() - Stop maintenance timer
495 * @di: pointer to the abx500_chargalg structure
496 *
497 * The maintenance timer is stopped whenever maintenance ends or when another
498 * state is entered
499 */
abx500_chargalg_stop_maintenance_timer(struct abx500_chargalg * di)500 static void abx500_chargalg_stop_maintenance_timer(struct abx500_chargalg *di)
501 {
502 if (hrtimer_try_to_cancel(&di->maintenance_timer) >= 0)
503 di->events.maintenance_timer_expired = false;
504 }
505
506 /**
507 * abx500_chargalg_kick_watchdog() - Kick charger watchdog
508 * @di: pointer to the abx500_chargalg structure
509 *
510 * The charger watchdog have to be kicked periodically whenever the charger is
511 * on, else the ABB will reset the system
512 */
abx500_chargalg_kick_watchdog(struct abx500_chargalg * di)513 static int abx500_chargalg_kick_watchdog(struct abx500_chargalg *di)
514 {
515 /* Check if charger exists and kick watchdog if charging */
516 if (di->ac_chg && di->ac_chg->ops.kick_wd &&
517 di->chg_info.online_chg & AC_CHG) {
518 /*
519 * If AB charger watchdog expired, pm2xxx charging
520 * gets disabled. To be safe, kick both AB charger watchdog
521 * and pm2xxx watchdog.
522 */
523 if (di->ac_chg->external &&
524 di->usb_chg && di->usb_chg->ops.kick_wd)
525 di->usb_chg->ops.kick_wd(di->usb_chg);
526
527 return di->ac_chg->ops.kick_wd(di->ac_chg);
528 }
529 else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
530 di->chg_info.online_chg & USB_CHG)
531 return di->usb_chg->ops.kick_wd(di->usb_chg);
532
533 return -ENXIO;
534 }
535
536 /**
537 * abx500_chargalg_ac_en() - Turn on/off the AC charger
538 * @di: pointer to the abx500_chargalg structure
539 * @enable: charger on/off
540 * @vset: requested charger output voltage
541 * @iset: requested charger output current
542 *
543 * The AC charger will be turned on/off with the requested charge voltage and
544 * current
545 */
abx500_chargalg_ac_en(struct abx500_chargalg * di,int enable,int vset,int iset)546 static int abx500_chargalg_ac_en(struct abx500_chargalg *di, int enable,
547 int vset, int iset)
548 {
549 static int abx500_chargalg_ex_ac_enable_toggle;
550
551 if (!di->ac_chg || !di->ac_chg->ops.enable)
552 return -ENXIO;
553
554 /* Select maximum of what both the charger and the battery supports */
555 if (di->ac_chg->max_out_volt)
556 vset = min(vset, di->ac_chg->max_out_volt);
557 if (di->ac_chg->max_out_curr)
558 iset = min(iset, di->ac_chg->max_out_curr);
559
560 di->chg_info.ac_iset = iset;
561 di->chg_info.ac_vset = vset;
562
563 /* Enable external charger */
564 if (enable && di->ac_chg->external &&
565 !abx500_chargalg_ex_ac_enable_toggle) {
566 blocking_notifier_call_chain(&charger_notifier_list,
567 0, di->dev);
568 abx500_chargalg_ex_ac_enable_toggle++;
569 }
570
571 return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
572 }
573
574 /**
575 * abx500_chargalg_usb_en() - Turn on/off the USB charger
576 * @di: pointer to the abx500_chargalg structure
577 * @enable: charger on/off
578 * @vset: requested charger output voltage
579 * @iset: requested charger output current
580 *
581 * The USB charger will be turned on/off with the requested charge voltage and
582 * current
583 */
abx500_chargalg_usb_en(struct abx500_chargalg * di,int enable,int vset,int iset)584 static int abx500_chargalg_usb_en(struct abx500_chargalg *di, int enable,
585 int vset, int iset)
586 {
587 if (!di->usb_chg || !di->usb_chg->ops.enable)
588 return -ENXIO;
589
590 /* Select maximum of what both the charger and the battery supports */
591 if (di->usb_chg->max_out_volt)
592 vset = min(vset, di->usb_chg->max_out_volt);
593 if (di->usb_chg->max_out_curr)
594 iset = min(iset, di->usb_chg->max_out_curr);
595
596 di->chg_info.usb_iset = iset;
597 di->chg_info.usb_vset = vset;
598
599 return di->usb_chg->ops.enable(di->usb_chg, enable, vset, iset);
600 }
601
602 /**
603 * abx500_chargalg_update_chg_curr() - Update charger current
604 * @di: pointer to the abx500_chargalg structure
605 * @iset: requested charger output current
606 *
607 * The charger output current will be updated for the charger
608 * that is currently in use
609 */
abx500_chargalg_update_chg_curr(struct abx500_chargalg * di,int iset)610 static int abx500_chargalg_update_chg_curr(struct abx500_chargalg *di,
611 int iset)
612 {
613 /* Check if charger exists and update current if charging */
614 if (di->ac_chg && di->ac_chg->ops.update_curr &&
615 di->chg_info.charger_type & AC_CHG) {
616 /*
617 * Select maximum of what both the charger
618 * and the battery supports
619 */
620 if (di->ac_chg->max_out_curr)
621 iset = min(iset, di->ac_chg->max_out_curr);
622
623 di->chg_info.ac_iset = iset;
624
625 return di->ac_chg->ops.update_curr(di->ac_chg, iset);
626 } else if (di->usb_chg && di->usb_chg->ops.update_curr &&
627 di->chg_info.charger_type & USB_CHG) {
628 /*
629 * Select maximum of what both the charger
630 * and the battery supports
631 */
632 if (di->usb_chg->max_out_curr)
633 iset = min(iset, di->usb_chg->max_out_curr);
634
635 di->chg_info.usb_iset = iset;
636
637 return di->usb_chg->ops.update_curr(di->usb_chg, iset);
638 }
639
640 return -ENXIO;
641 }
642
643 /**
644 * abx500_chargalg_stop_charging() - Stop charging
645 * @di: pointer to the abx500_chargalg structure
646 *
647 * This function is called from any state where charging should be stopped.
648 * All charging is disabled and all status parameters and timers are changed
649 * accordingly
650 */
abx500_chargalg_stop_charging(struct abx500_chargalg * di)651 static void abx500_chargalg_stop_charging(struct abx500_chargalg *di)
652 {
653 abx500_chargalg_ac_en(di, false, 0, 0);
654 abx500_chargalg_usb_en(di, false, 0, 0);
655 abx500_chargalg_stop_safety_timer(di);
656 abx500_chargalg_stop_maintenance_timer(di);
657 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
658 di->maintenance_chg = false;
659 cancel_delayed_work(&di->chargalg_wd_work);
660 power_supply_changed(di->chargalg_psy);
661 }
662
663 /**
664 * abx500_chargalg_hold_charging() - Pauses charging
665 * @di: pointer to the abx500_chargalg structure
666 *
667 * This function is called in the case where maintenance charging has been
668 * disabled and instead a battery voltage mode is entered to check when the
669 * battery voltage has reached a certain recharge voltage
670 */
abx500_chargalg_hold_charging(struct abx500_chargalg * di)671 static void abx500_chargalg_hold_charging(struct abx500_chargalg *di)
672 {
673 abx500_chargalg_ac_en(di, false, 0, 0);
674 abx500_chargalg_usb_en(di, false, 0, 0);
675 abx500_chargalg_stop_safety_timer(di);
676 abx500_chargalg_stop_maintenance_timer(di);
677 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
678 di->maintenance_chg = false;
679 cancel_delayed_work(&di->chargalg_wd_work);
680 power_supply_changed(di->chargalg_psy);
681 }
682
683 /**
684 * abx500_chargalg_start_charging() - Start the charger
685 * @di: pointer to the abx500_chargalg structure
686 * @vset: requested charger output voltage
687 * @iset: requested charger output current
688 *
689 * A charger will be enabled depending on the requested charger type that was
690 * detected previously.
691 */
abx500_chargalg_start_charging(struct abx500_chargalg * di,int vset,int iset)692 static void abx500_chargalg_start_charging(struct abx500_chargalg *di,
693 int vset, int iset)
694 {
695 switch (di->chg_info.charger_type) {
696 case AC_CHG:
697 dev_dbg(di->dev,
698 "AC parameters: Vset %d, Ich %d\n", vset, iset);
699 abx500_chargalg_usb_en(di, false, 0, 0);
700 abx500_chargalg_ac_en(di, true, vset, iset);
701 break;
702
703 case USB_CHG:
704 dev_dbg(di->dev,
705 "USB parameters: Vset %d, Ich %d\n", vset, iset);
706 abx500_chargalg_ac_en(di, false, 0, 0);
707 abx500_chargalg_usb_en(di, true, vset, iset);
708 break;
709
710 default:
711 dev_err(di->dev, "Unknown charger to charge from\n");
712 break;
713 }
714 }
715
716 /**
717 * abx500_chargalg_check_temp() - Check battery temperature ranges
718 * @di: pointer to the abx500_chargalg structure
719 *
720 * The battery temperature is checked against the predefined limits and the
721 * charge state is changed accordingly
722 */
abx500_chargalg_check_temp(struct abx500_chargalg * di)723 static void abx500_chargalg_check_temp(struct abx500_chargalg *di)
724 {
725 if (di->batt_data.temp > (di->bm->temp_low + di->t_hyst_norm) &&
726 di->batt_data.temp < (di->bm->temp_high - di->t_hyst_norm)) {
727 /* Temp OK! */
728 di->events.btemp_underover = false;
729 di->events.btemp_lowhigh = false;
730 di->t_hyst_norm = 0;
731 di->t_hyst_lowhigh = 0;
732 } else {
733 if (((di->batt_data.temp >= di->bm->temp_high) &&
734 (di->batt_data.temp <
735 (di->bm->temp_over - di->t_hyst_lowhigh))) ||
736 ((di->batt_data.temp >
737 (di->bm->temp_under + di->t_hyst_lowhigh)) &&
738 (di->batt_data.temp <= di->bm->temp_low))) {
739 /* TEMP minor!!!!! */
740 di->events.btemp_underover = false;
741 di->events.btemp_lowhigh = true;
742 di->t_hyst_norm = di->bm->temp_hysteresis;
743 di->t_hyst_lowhigh = 0;
744 } else if (di->batt_data.temp <= di->bm->temp_under ||
745 di->batt_data.temp >= di->bm->temp_over) {
746 /* TEMP major!!!!! */
747 di->events.btemp_underover = true;
748 di->events.btemp_lowhigh = false;
749 di->t_hyst_norm = 0;
750 di->t_hyst_lowhigh = di->bm->temp_hysteresis;
751 } else {
752 /* Within hysteresis */
753 dev_dbg(di->dev, "Within hysteresis limit temp: %d "
754 "hyst_lowhigh %d, hyst normal %d\n",
755 di->batt_data.temp, di->t_hyst_lowhigh,
756 di->t_hyst_norm);
757 }
758 }
759 }
760
761 /**
762 * abx500_chargalg_check_charger_voltage() - Check charger voltage
763 * @di: pointer to the abx500_chargalg structure
764 *
765 * Charger voltage is checked against maximum limit
766 */
abx500_chargalg_check_charger_voltage(struct abx500_chargalg * di)767 static void abx500_chargalg_check_charger_voltage(struct abx500_chargalg *di)
768 {
769 if (di->chg_info.usb_volt > di->bm->chg_params->usb_volt_max)
770 di->chg_info.usb_chg_ok = false;
771 else
772 di->chg_info.usb_chg_ok = true;
773
774 if (di->chg_info.ac_volt > di->bm->chg_params->ac_volt_max)
775 di->chg_info.ac_chg_ok = false;
776 else
777 di->chg_info.ac_chg_ok = true;
778
779 }
780
781 /**
782 * abx500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
783 * @di: pointer to the abx500_chargalg structure
784 *
785 * End-of-charge criteria is fulfilled when the battery voltage is above a
786 * certain limit and the battery current is below a certain limit for a
787 * predefined number of consecutive seconds. If true, the battery is full
788 */
abx500_chargalg_end_of_charge(struct abx500_chargalg * di)789 static void abx500_chargalg_end_of_charge(struct abx500_chargalg *di)
790 {
791 if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
792 di->charge_state == STATE_NORMAL &&
793 !di->maintenance_chg && (di->batt_data.volt >=
794 di->bm->bat_type[di->bm->batt_id].termination_vol ||
795 di->events.usb_cv_active || di->events.ac_cv_active) &&
796 di->batt_data.avg_curr <
797 di->bm->bat_type[di->bm->batt_id].termination_curr &&
798 di->batt_data.avg_curr > 0) {
799 if (++di->eoc_cnt >= EOC_COND_CNT) {
800 di->eoc_cnt = 0;
801 di->charge_status = POWER_SUPPLY_STATUS_FULL;
802 di->maintenance_chg = true;
803 dev_dbg(di->dev, "EOC reached!\n");
804 power_supply_changed(di->chargalg_psy);
805 } else {
806 dev_dbg(di->dev,
807 " EOC limit reached for the %d"
808 " time, out of %d before EOC\n",
809 di->eoc_cnt,
810 EOC_COND_CNT);
811 }
812 } else {
813 di->eoc_cnt = 0;
814 }
815 }
816
init_maxim_chg_curr(struct abx500_chargalg * di)817 static void init_maxim_chg_curr(struct abx500_chargalg *di)
818 {
819 di->ccm.original_iset =
820 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
821 di->ccm.current_iset =
822 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
823 di->ccm.test_delta_i = di->bm->maxi->charger_curr_step;
824 di->ccm.max_current = di->bm->maxi->chg_curr;
825 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
826 di->ccm.level = 0;
827 }
828
829 /**
830 * abx500_chargalg_chg_curr_maxim - increases the charger current to
831 * compensate for the system load
832 * @di pointer to the abx500_chargalg structure
833 *
834 * This maximization function is used to raise the charger current to get the
835 * battery current as close to the optimal value as possible. The battery
836 * current during charging is affected by the system load
837 */
abx500_chargalg_chg_curr_maxim(struct abx500_chargalg * di)838 static enum maxim_ret abx500_chargalg_chg_curr_maxim(struct abx500_chargalg *di)
839 {
840 int delta_i;
841
842 if (!di->bm->maxi->ena_maxi)
843 return MAXIM_RET_NOACTION;
844
845 delta_i = di->ccm.original_iset - di->batt_data.inst_curr;
846
847 if (di->events.vbus_collapsed) {
848 dev_dbg(di->dev, "Charger voltage has collapsed %d\n",
849 di->ccm.wait_cnt);
850 if (di->ccm.wait_cnt == 0) {
851 dev_dbg(di->dev, "lowering current\n");
852 di->ccm.wait_cnt++;
853 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
854 di->ccm.max_current =
855 di->ccm.current_iset - di->ccm.test_delta_i;
856 di->ccm.current_iset = di->ccm.max_current;
857 di->ccm.level--;
858 return MAXIM_RET_CHANGE;
859 } else {
860 dev_dbg(di->dev, "waiting\n");
861 /* Let's go in here twice before lowering curr again */
862 di->ccm.wait_cnt = (di->ccm.wait_cnt + 1) % 3;
863 return MAXIM_RET_NOACTION;
864 }
865 }
866
867 di->ccm.wait_cnt = 0;
868
869 if ((di->batt_data.inst_curr > di->ccm.original_iset)) {
870 dev_dbg(di->dev, " Maximization Ibat (%dmA) too high"
871 " (limit %dmA) (current iset: %dmA)!\n",
872 di->batt_data.inst_curr, di->ccm.original_iset,
873 di->ccm.current_iset);
874
875 if (di->ccm.current_iset == di->ccm.original_iset)
876 return MAXIM_RET_NOACTION;
877
878 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
879 di->ccm.current_iset = di->ccm.original_iset;
880 di->ccm.level = 0;
881
882 return MAXIM_RET_IBAT_TOO_HIGH;
883 }
884
885 if (delta_i > di->ccm.test_delta_i &&
886 (di->ccm.current_iset + di->ccm.test_delta_i) <
887 di->ccm.max_current) {
888 if (di->ccm.condition_cnt-- == 0) {
889 /* Increse the iset with cco.test_delta_i */
890 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
891 di->ccm.current_iset += di->ccm.test_delta_i;
892 di->ccm.level++;
893 dev_dbg(di->dev, " Maximization needed, increase"
894 " with %d mA to %dmA (Optimal ibat: %d)"
895 " Level %d\n",
896 di->ccm.test_delta_i,
897 di->ccm.current_iset,
898 di->ccm.original_iset,
899 di->ccm.level);
900 return MAXIM_RET_CHANGE;
901 } else {
902 return MAXIM_RET_NOACTION;
903 }
904 } else {
905 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
906 return MAXIM_RET_NOACTION;
907 }
908 }
909
handle_maxim_chg_curr(struct abx500_chargalg * di)910 static void handle_maxim_chg_curr(struct abx500_chargalg *di)
911 {
912 enum maxim_ret ret;
913 int result;
914
915 ret = abx500_chargalg_chg_curr_maxim(di);
916 switch (ret) {
917 case MAXIM_RET_CHANGE:
918 result = abx500_chargalg_update_chg_curr(di,
919 di->ccm.current_iset);
920 if (result)
921 dev_err(di->dev, "failed to set chg curr\n");
922 break;
923 case MAXIM_RET_IBAT_TOO_HIGH:
924 result = abx500_chargalg_update_chg_curr(di,
925 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
926 if (result)
927 dev_err(di->dev, "failed to set chg curr\n");
928 break;
929
930 case MAXIM_RET_NOACTION:
931 default:
932 /* Do nothing..*/
933 break;
934 }
935 }
936
abx500_chargalg_get_ext_psy_data(struct device * dev,void * data)937 static int abx500_chargalg_get_ext_psy_data(struct device *dev, void *data)
938 {
939 struct power_supply *psy;
940 struct power_supply *ext = dev_get_drvdata(dev);
941 const char **supplicants = (const char **)ext->supplied_to;
942 struct abx500_chargalg *di;
943 union power_supply_propval ret;
944 int j;
945 bool capacity_updated = false;
946
947 psy = (struct power_supply *)data;
948 di = power_supply_get_drvdata(psy);
949 /* For all psy where the driver name appears in any supplied_to */
950 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
951 if (j < 0)
952 return 0;
953
954 /*
955 * If external is not registering 'POWER_SUPPLY_PROP_CAPACITY' to its
956 * property because of handling that sysfs entry on its own, this is
957 * the place to get the battery capacity.
958 */
959 if (!power_supply_get_property(ext, POWER_SUPPLY_PROP_CAPACITY, &ret)) {
960 di->batt_data.percent = ret.intval;
961 capacity_updated = true;
962 }
963
964 /* Go through all properties for the psy */
965 for (j = 0; j < ext->desc->num_properties; j++) {
966 enum power_supply_property prop;
967 prop = ext->desc->properties[j];
968
969 /*
970 * Initialize chargers if not already done.
971 * The ab8500_charger*/
972 if (!di->ac_chg &&
973 ext->desc->type == POWER_SUPPLY_TYPE_MAINS)
974 di->ac_chg = psy_to_ux500_charger(ext);
975 else if (!di->usb_chg &&
976 ext->desc->type == POWER_SUPPLY_TYPE_USB)
977 di->usb_chg = psy_to_ux500_charger(ext);
978
979 if (power_supply_get_property(ext, prop, &ret))
980 continue;
981 switch (prop) {
982 case POWER_SUPPLY_PROP_PRESENT:
983 switch (ext->desc->type) {
984 case POWER_SUPPLY_TYPE_BATTERY:
985 /* Battery present */
986 if (ret.intval)
987 di->events.batt_rem = false;
988 /* Battery removed */
989 else
990 di->events.batt_rem = true;
991 break;
992 case POWER_SUPPLY_TYPE_MAINS:
993 /* AC disconnected */
994 if (!ret.intval &&
995 (di->chg_info.conn_chg & AC_CHG)) {
996 di->chg_info.prev_conn_chg =
997 di->chg_info.conn_chg;
998 di->chg_info.conn_chg &= ~AC_CHG;
999 }
1000 /* AC connected */
1001 else if (ret.intval &&
1002 !(di->chg_info.conn_chg & AC_CHG)) {
1003 di->chg_info.prev_conn_chg =
1004 di->chg_info.conn_chg;
1005 di->chg_info.conn_chg |= AC_CHG;
1006 }
1007 break;
1008 case POWER_SUPPLY_TYPE_USB:
1009 /* USB disconnected */
1010 if (!ret.intval &&
1011 (di->chg_info.conn_chg & USB_CHG)) {
1012 di->chg_info.prev_conn_chg =
1013 di->chg_info.conn_chg;
1014 di->chg_info.conn_chg &= ~USB_CHG;
1015 }
1016 /* USB connected */
1017 else if (ret.intval &&
1018 !(di->chg_info.conn_chg & USB_CHG)) {
1019 di->chg_info.prev_conn_chg =
1020 di->chg_info.conn_chg;
1021 di->chg_info.conn_chg |= USB_CHG;
1022 }
1023 break;
1024 default:
1025 break;
1026 }
1027 break;
1028
1029 case POWER_SUPPLY_PROP_ONLINE:
1030 switch (ext->desc->type) {
1031 case POWER_SUPPLY_TYPE_BATTERY:
1032 break;
1033 case POWER_SUPPLY_TYPE_MAINS:
1034 /* AC offline */
1035 if (!ret.intval &&
1036 (di->chg_info.online_chg & AC_CHG)) {
1037 di->chg_info.prev_online_chg =
1038 di->chg_info.online_chg;
1039 di->chg_info.online_chg &= ~AC_CHG;
1040 }
1041 /* AC online */
1042 else if (ret.intval &&
1043 !(di->chg_info.online_chg & AC_CHG)) {
1044 di->chg_info.prev_online_chg =
1045 di->chg_info.online_chg;
1046 di->chg_info.online_chg |= AC_CHG;
1047 queue_delayed_work(di->chargalg_wq,
1048 &di->chargalg_wd_work, 0);
1049 }
1050 break;
1051 case POWER_SUPPLY_TYPE_USB:
1052 /* USB offline */
1053 if (!ret.intval &&
1054 (di->chg_info.online_chg & USB_CHG)) {
1055 di->chg_info.prev_online_chg =
1056 di->chg_info.online_chg;
1057 di->chg_info.online_chg &= ~USB_CHG;
1058 }
1059 /* USB online */
1060 else if (ret.intval &&
1061 !(di->chg_info.online_chg & USB_CHG)) {
1062 di->chg_info.prev_online_chg =
1063 di->chg_info.online_chg;
1064 di->chg_info.online_chg |= USB_CHG;
1065 queue_delayed_work(di->chargalg_wq,
1066 &di->chargalg_wd_work, 0);
1067 }
1068 break;
1069 default:
1070 break;
1071 }
1072 break;
1073
1074 case POWER_SUPPLY_PROP_HEALTH:
1075 switch (ext->desc->type) {
1076 case POWER_SUPPLY_TYPE_BATTERY:
1077 break;
1078 case POWER_SUPPLY_TYPE_MAINS:
1079 switch (ret.intval) {
1080 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1081 di->events.mainextchnotok = true;
1082 di->events.main_thermal_prot = false;
1083 di->events.main_ovv = false;
1084 di->events.ac_wd_expired = false;
1085 break;
1086 case POWER_SUPPLY_HEALTH_DEAD:
1087 di->events.ac_wd_expired = true;
1088 di->events.mainextchnotok = false;
1089 di->events.main_ovv = false;
1090 di->events.main_thermal_prot = false;
1091 break;
1092 case POWER_SUPPLY_HEALTH_COLD:
1093 case POWER_SUPPLY_HEALTH_OVERHEAT:
1094 di->events.main_thermal_prot = true;
1095 di->events.mainextchnotok = false;
1096 di->events.main_ovv = false;
1097 di->events.ac_wd_expired = false;
1098 break;
1099 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1100 di->events.main_ovv = true;
1101 di->events.mainextchnotok = false;
1102 di->events.main_thermal_prot = false;
1103 di->events.ac_wd_expired = false;
1104 break;
1105 case POWER_SUPPLY_HEALTH_GOOD:
1106 di->events.main_thermal_prot = false;
1107 di->events.mainextchnotok = false;
1108 di->events.main_ovv = false;
1109 di->events.ac_wd_expired = false;
1110 break;
1111 default:
1112 break;
1113 }
1114 break;
1115
1116 case POWER_SUPPLY_TYPE_USB:
1117 switch (ret.intval) {
1118 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1119 di->events.usbchargernotok = true;
1120 di->events.usb_thermal_prot = false;
1121 di->events.vbus_ovv = false;
1122 di->events.usb_wd_expired = false;
1123 break;
1124 case POWER_SUPPLY_HEALTH_DEAD:
1125 di->events.usb_wd_expired = true;
1126 di->events.usbchargernotok = false;
1127 di->events.usb_thermal_prot = false;
1128 di->events.vbus_ovv = false;
1129 break;
1130 case POWER_SUPPLY_HEALTH_COLD:
1131 case POWER_SUPPLY_HEALTH_OVERHEAT:
1132 di->events.usb_thermal_prot = true;
1133 di->events.usbchargernotok = false;
1134 di->events.vbus_ovv = false;
1135 di->events.usb_wd_expired = false;
1136 break;
1137 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1138 di->events.vbus_ovv = true;
1139 di->events.usbchargernotok = false;
1140 di->events.usb_thermal_prot = false;
1141 di->events.usb_wd_expired = false;
1142 break;
1143 case POWER_SUPPLY_HEALTH_GOOD:
1144 di->events.usbchargernotok = false;
1145 di->events.usb_thermal_prot = false;
1146 di->events.vbus_ovv = false;
1147 di->events.usb_wd_expired = false;
1148 break;
1149 default:
1150 break;
1151 }
1152 default:
1153 break;
1154 }
1155 break;
1156
1157 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1158 switch (ext->desc->type) {
1159 case POWER_SUPPLY_TYPE_BATTERY:
1160 di->batt_data.volt = ret.intval / 1000;
1161 break;
1162 case POWER_SUPPLY_TYPE_MAINS:
1163 di->chg_info.ac_volt = ret.intval / 1000;
1164 break;
1165 case POWER_SUPPLY_TYPE_USB:
1166 di->chg_info.usb_volt = ret.intval / 1000;
1167 break;
1168 default:
1169 break;
1170 }
1171 break;
1172
1173 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
1174 switch (ext->desc->type) {
1175 case POWER_SUPPLY_TYPE_MAINS:
1176 /* AVG is used to indicate when we are
1177 * in CV mode */
1178 if (ret.intval)
1179 di->events.ac_cv_active = true;
1180 else
1181 di->events.ac_cv_active = false;
1182
1183 break;
1184 case POWER_SUPPLY_TYPE_USB:
1185 /* AVG is used to indicate when we are
1186 * in CV mode */
1187 if (ret.intval)
1188 di->events.usb_cv_active = true;
1189 else
1190 di->events.usb_cv_active = false;
1191
1192 break;
1193 default:
1194 break;
1195 }
1196 break;
1197
1198 case POWER_SUPPLY_PROP_TECHNOLOGY:
1199 switch (ext->desc->type) {
1200 case POWER_SUPPLY_TYPE_BATTERY:
1201 if (ret.intval)
1202 di->events.batt_unknown = false;
1203 else
1204 di->events.batt_unknown = true;
1205
1206 break;
1207 default:
1208 break;
1209 }
1210 break;
1211
1212 case POWER_SUPPLY_PROP_TEMP:
1213 di->batt_data.temp = ret.intval / 10;
1214 break;
1215
1216 case POWER_SUPPLY_PROP_CURRENT_NOW:
1217 switch (ext->desc->type) {
1218 case POWER_SUPPLY_TYPE_MAINS:
1219 di->chg_info.ac_curr =
1220 ret.intval / 1000;
1221 break;
1222 case POWER_SUPPLY_TYPE_USB:
1223 di->chg_info.usb_curr =
1224 ret.intval / 1000;
1225 break;
1226 case POWER_SUPPLY_TYPE_BATTERY:
1227 di->batt_data.inst_curr = ret.intval / 1000;
1228 break;
1229 default:
1230 break;
1231 }
1232 break;
1233
1234 case POWER_SUPPLY_PROP_CURRENT_AVG:
1235 switch (ext->desc->type) {
1236 case POWER_SUPPLY_TYPE_BATTERY:
1237 di->batt_data.avg_curr = ret.intval / 1000;
1238 break;
1239 case POWER_SUPPLY_TYPE_USB:
1240 if (ret.intval)
1241 di->events.vbus_collapsed = true;
1242 else
1243 di->events.vbus_collapsed = false;
1244 break;
1245 default:
1246 break;
1247 }
1248 break;
1249 case POWER_SUPPLY_PROP_CAPACITY:
1250 if (!capacity_updated)
1251 di->batt_data.percent = ret.intval;
1252 break;
1253 default:
1254 break;
1255 }
1256 }
1257 return 0;
1258 }
1259
1260 /**
1261 * abx500_chargalg_external_power_changed() - callback for power supply changes
1262 * @psy: pointer to the structure power_supply
1263 *
1264 * This function is the entry point of the pointer external_power_changed
1265 * of the structure power_supply.
1266 * This function gets executed when there is a change in any external power
1267 * supply that this driver needs to be notified of.
1268 */
abx500_chargalg_external_power_changed(struct power_supply * psy)1269 static void abx500_chargalg_external_power_changed(struct power_supply *psy)
1270 {
1271 struct abx500_chargalg *di = power_supply_get_drvdata(psy);
1272
1273 /*
1274 * Trigger execution of the algorithm instantly and read
1275 * all power_supply properties there instead
1276 */
1277 queue_work(di->chargalg_wq, &di->chargalg_work);
1278 }
1279
1280 /**
1281 * abx500_chargalg_algorithm() - Main function for the algorithm
1282 * @di: pointer to the abx500_chargalg structure
1283 *
1284 * This is the main control function for the charging algorithm.
1285 * It is called periodically or when something happens that will
1286 * trigger a state change
1287 */
abx500_chargalg_algorithm(struct abx500_chargalg * di)1288 static void abx500_chargalg_algorithm(struct abx500_chargalg *di)
1289 {
1290 int charger_status;
1291 int ret;
1292 int curr_step_lvl;
1293
1294 /* Collect data from all power_supply class devices */
1295 class_for_each_device(power_supply_class, NULL,
1296 di->chargalg_psy, abx500_chargalg_get_ext_psy_data);
1297
1298 abx500_chargalg_end_of_charge(di);
1299 abx500_chargalg_check_temp(di);
1300 abx500_chargalg_check_charger_voltage(di);
1301
1302 charger_status = abx500_chargalg_check_charger_connection(di);
1303 abx500_chargalg_check_current_step_status(di);
1304
1305 if (is_ab8500(di->parent)) {
1306 ret = abx500_chargalg_check_charger_enable(di);
1307 if (ret < 0)
1308 dev_err(di->dev, "Checking charger is enabled error"
1309 ": Returned Value %d\n", ret);
1310 }
1311
1312 /*
1313 * First check if we have a charger connected.
1314 * Also we don't allow charging of unknown batteries if configured
1315 * this way
1316 */
1317 if (!charger_status ||
1318 (di->events.batt_unknown && !di->bm->chg_unknown_bat)) {
1319 if (di->charge_state != STATE_HANDHELD) {
1320 di->events.safety_timer_expired = false;
1321 abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
1322 }
1323 }
1324
1325 /* If suspended, we should not continue checking the flags */
1326 else if (di->charge_state == STATE_SUSPENDED_INIT ||
1327 di->charge_state == STATE_SUSPENDED) {
1328 /* We don't do anything here, just don,t continue */
1329 }
1330
1331 /* Safety timer expiration */
1332 else if (di->events.safety_timer_expired) {
1333 if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
1334 abx500_chargalg_state_to(di,
1335 STATE_SAFETY_TIMER_EXPIRED_INIT);
1336 }
1337 /*
1338 * Check if any interrupts has occured
1339 * that will prevent us from charging
1340 */
1341
1342 /* Battery removed */
1343 else if (di->events.batt_rem) {
1344 if (di->charge_state != STATE_BATT_REMOVED)
1345 abx500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
1346 }
1347 /* Main or USB charger not ok. */
1348 else if (di->events.mainextchnotok || di->events.usbchargernotok) {
1349 /*
1350 * If vbus_collapsed is set, we have to lower the charger
1351 * current, which is done in the normal state below
1352 */
1353 if (di->charge_state != STATE_CHG_NOT_OK &&
1354 !di->events.vbus_collapsed)
1355 abx500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
1356 }
1357 /* VBUS, Main or VBAT OVV. */
1358 else if (di->events.vbus_ovv ||
1359 di->events.main_ovv ||
1360 di->events.batt_ovv ||
1361 !di->chg_info.usb_chg_ok ||
1362 !di->chg_info.ac_chg_ok) {
1363 if (di->charge_state != STATE_OVV_PROTECT)
1364 abx500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
1365 }
1366 /* USB Thermal, stop charging */
1367 else if (di->events.main_thermal_prot ||
1368 di->events.usb_thermal_prot) {
1369 if (di->charge_state != STATE_HW_TEMP_PROTECT)
1370 abx500_chargalg_state_to(di,
1371 STATE_HW_TEMP_PROTECT_INIT);
1372 }
1373 /* Battery temp over/under */
1374 else if (di->events.btemp_underover) {
1375 if (di->charge_state != STATE_TEMP_UNDEROVER)
1376 abx500_chargalg_state_to(di,
1377 STATE_TEMP_UNDEROVER_INIT);
1378 }
1379 /* Watchdog expired */
1380 else if (di->events.ac_wd_expired ||
1381 di->events.usb_wd_expired) {
1382 if (di->charge_state != STATE_WD_EXPIRED)
1383 abx500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
1384 }
1385 /* Battery temp high/low */
1386 else if (di->events.btemp_lowhigh) {
1387 if (di->charge_state != STATE_TEMP_LOWHIGH)
1388 abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
1389 }
1390
1391 dev_dbg(di->dev,
1392 "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
1393 "State %s Active_chg %d Chg_status %d AC %d USB %d "
1394 "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
1395 "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
1396 di->batt_data.volt,
1397 di->batt_data.avg_curr,
1398 di->batt_data.inst_curr,
1399 di->batt_data.temp,
1400 di->batt_data.percent,
1401 di->maintenance_chg,
1402 states[di->charge_state],
1403 di->chg_info.charger_type,
1404 di->charge_status,
1405 di->chg_info.conn_chg & AC_CHG,
1406 di->chg_info.conn_chg & USB_CHG,
1407 di->chg_info.online_chg & AC_CHG,
1408 di->chg_info.online_chg & USB_CHG,
1409 di->events.ac_cv_active,
1410 di->events.usb_cv_active,
1411 di->chg_info.ac_curr,
1412 di->chg_info.usb_curr,
1413 di->chg_info.ac_vset,
1414 di->chg_info.ac_iset,
1415 di->chg_info.usb_vset,
1416 di->chg_info.usb_iset);
1417
1418 switch (di->charge_state) {
1419 case STATE_HANDHELD_INIT:
1420 abx500_chargalg_stop_charging(di);
1421 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
1422 abx500_chargalg_state_to(di, STATE_HANDHELD);
1423 fallthrough;
1424
1425 case STATE_HANDHELD:
1426 break;
1427
1428 case STATE_SUSPENDED_INIT:
1429 if (di->susp_status.ac_suspended)
1430 abx500_chargalg_ac_en(di, false, 0, 0);
1431 if (di->susp_status.usb_suspended)
1432 abx500_chargalg_usb_en(di, false, 0, 0);
1433 abx500_chargalg_stop_safety_timer(di);
1434 abx500_chargalg_stop_maintenance_timer(di);
1435 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1436 di->maintenance_chg = false;
1437 abx500_chargalg_state_to(di, STATE_SUSPENDED);
1438 power_supply_changed(di->chargalg_psy);
1439 fallthrough;
1440
1441 case STATE_SUSPENDED:
1442 /* CHARGING is suspended */
1443 break;
1444
1445 case STATE_BATT_REMOVED_INIT:
1446 abx500_chargalg_stop_charging(di);
1447 abx500_chargalg_state_to(di, STATE_BATT_REMOVED);
1448 fallthrough;
1449
1450 case STATE_BATT_REMOVED:
1451 if (!di->events.batt_rem)
1452 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1453 break;
1454
1455 case STATE_HW_TEMP_PROTECT_INIT:
1456 abx500_chargalg_stop_charging(di);
1457 abx500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
1458 fallthrough;
1459
1460 case STATE_HW_TEMP_PROTECT:
1461 if (!di->events.main_thermal_prot &&
1462 !di->events.usb_thermal_prot)
1463 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1464 break;
1465
1466 case STATE_OVV_PROTECT_INIT:
1467 abx500_chargalg_stop_charging(di);
1468 abx500_chargalg_state_to(di, STATE_OVV_PROTECT);
1469 fallthrough;
1470
1471 case STATE_OVV_PROTECT:
1472 if (!di->events.vbus_ovv &&
1473 !di->events.main_ovv &&
1474 !di->events.batt_ovv &&
1475 di->chg_info.usb_chg_ok &&
1476 di->chg_info.ac_chg_ok)
1477 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1478 break;
1479
1480 case STATE_CHG_NOT_OK_INIT:
1481 abx500_chargalg_stop_charging(di);
1482 abx500_chargalg_state_to(di, STATE_CHG_NOT_OK);
1483 fallthrough;
1484
1485 case STATE_CHG_NOT_OK:
1486 if (!di->events.mainextchnotok &&
1487 !di->events.usbchargernotok)
1488 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1489 break;
1490
1491 case STATE_SAFETY_TIMER_EXPIRED_INIT:
1492 abx500_chargalg_stop_charging(di);
1493 abx500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
1494 fallthrough;
1495
1496 case STATE_SAFETY_TIMER_EXPIRED:
1497 /* We exit this state when charger is removed */
1498 break;
1499
1500 case STATE_NORMAL_INIT:
1501 if (di->curr_status.curr_step == CHARGALG_CURR_STEP_LOW)
1502 abx500_chargalg_stop_charging(di);
1503 else {
1504 curr_step_lvl = di->bm->bat_type[
1505 di->bm->batt_id].normal_cur_lvl
1506 * di->curr_status.curr_step
1507 / CHARGALG_CURR_STEP_HIGH;
1508 abx500_chargalg_start_charging(di,
1509 di->bm->bat_type[di->bm->batt_id]
1510 .normal_vol_lvl, curr_step_lvl);
1511 }
1512
1513 abx500_chargalg_state_to(di, STATE_NORMAL);
1514 abx500_chargalg_start_safety_timer(di);
1515 abx500_chargalg_stop_maintenance_timer(di);
1516 init_maxim_chg_curr(di);
1517 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1518 di->eoc_cnt = 0;
1519 di->maintenance_chg = false;
1520 power_supply_changed(di->chargalg_psy);
1521
1522 break;
1523
1524 case STATE_NORMAL:
1525 handle_maxim_chg_curr(di);
1526 if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
1527 di->maintenance_chg) {
1528 if (di->bm->no_maintenance)
1529 abx500_chargalg_state_to(di,
1530 STATE_WAIT_FOR_RECHARGE_INIT);
1531 else
1532 abx500_chargalg_state_to(di,
1533 STATE_MAINTENANCE_A_INIT);
1534 }
1535 break;
1536
1537 /* This state will be used when the maintenance state is disabled */
1538 case STATE_WAIT_FOR_RECHARGE_INIT:
1539 abx500_chargalg_hold_charging(di);
1540 abx500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
1541 fallthrough;
1542
1543 case STATE_WAIT_FOR_RECHARGE:
1544 if (di->batt_data.percent <=
1545 di->bm->bat_type[di->bm->batt_id].
1546 recharge_cap)
1547 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1548 break;
1549
1550 case STATE_MAINTENANCE_A_INIT:
1551 abx500_chargalg_stop_safety_timer(di);
1552 abx500_chargalg_start_maintenance_timer(di,
1553 di->bm->bat_type[
1554 di->bm->batt_id].maint_a_chg_timer_h);
1555 abx500_chargalg_start_charging(di,
1556 di->bm->bat_type[
1557 di->bm->batt_id].maint_a_vol_lvl,
1558 di->bm->bat_type[
1559 di->bm->batt_id].maint_a_cur_lvl);
1560 abx500_chargalg_state_to(di, STATE_MAINTENANCE_A);
1561 power_supply_changed(di->chargalg_psy);
1562 fallthrough;
1563
1564 case STATE_MAINTENANCE_A:
1565 if (di->events.maintenance_timer_expired) {
1566 abx500_chargalg_stop_maintenance_timer(di);
1567 abx500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
1568 }
1569 break;
1570
1571 case STATE_MAINTENANCE_B_INIT:
1572 abx500_chargalg_start_maintenance_timer(di,
1573 di->bm->bat_type[
1574 di->bm->batt_id].maint_b_chg_timer_h);
1575 abx500_chargalg_start_charging(di,
1576 di->bm->bat_type[
1577 di->bm->batt_id].maint_b_vol_lvl,
1578 di->bm->bat_type[
1579 di->bm->batt_id].maint_b_cur_lvl);
1580 abx500_chargalg_state_to(di, STATE_MAINTENANCE_B);
1581 power_supply_changed(di->chargalg_psy);
1582 fallthrough;
1583
1584 case STATE_MAINTENANCE_B:
1585 if (di->events.maintenance_timer_expired) {
1586 abx500_chargalg_stop_maintenance_timer(di);
1587 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1588 }
1589 break;
1590
1591 case STATE_TEMP_LOWHIGH_INIT:
1592 abx500_chargalg_start_charging(di,
1593 di->bm->bat_type[
1594 di->bm->batt_id].low_high_vol_lvl,
1595 di->bm->bat_type[
1596 di->bm->batt_id].low_high_cur_lvl);
1597 abx500_chargalg_stop_maintenance_timer(di);
1598 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1599 abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
1600 power_supply_changed(di->chargalg_psy);
1601 fallthrough;
1602
1603 case STATE_TEMP_LOWHIGH:
1604 if (!di->events.btemp_lowhigh)
1605 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1606 break;
1607
1608 case STATE_WD_EXPIRED_INIT:
1609 abx500_chargalg_stop_charging(di);
1610 abx500_chargalg_state_to(di, STATE_WD_EXPIRED);
1611 fallthrough;
1612
1613 case STATE_WD_EXPIRED:
1614 if (!di->events.ac_wd_expired &&
1615 !di->events.usb_wd_expired)
1616 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1617 break;
1618
1619 case STATE_TEMP_UNDEROVER_INIT:
1620 abx500_chargalg_stop_charging(di);
1621 abx500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
1622 fallthrough;
1623
1624 case STATE_TEMP_UNDEROVER:
1625 if (!di->events.btemp_underover)
1626 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1627 break;
1628 }
1629
1630 /* Start charging directly if the new state is a charge state */
1631 if (di->charge_state == STATE_NORMAL_INIT ||
1632 di->charge_state == STATE_MAINTENANCE_A_INIT ||
1633 di->charge_state == STATE_MAINTENANCE_B_INIT)
1634 queue_work(di->chargalg_wq, &di->chargalg_work);
1635 }
1636
1637 /**
1638 * abx500_chargalg_periodic_work() - Periodic work for the algorithm
1639 * @work: pointer to the work_struct structure
1640 *
1641 * Work queue function for the charging algorithm
1642 */
abx500_chargalg_periodic_work(struct work_struct * work)1643 static void abx500_chargalg_periodic_work(struct work_struct *work)
1644 {
1645 struct abx500_chargalg *di = container_of(work,
1646 struct abx500_chargalg, chargalg_periodic_work.work);
1647
1648 abx500_chargalg_algorithm(di);
1649
1650 /*
1651 * If a charger is connected then the battery has to be monitored
1652 * frequently, else the work can be delayed.
1653 */
1654 if (di->chg_info.conn_chg)
1655 queue_delayed_work(di->chargalg_wq,
1656 &di->chargalg_periodic_work,
1657 di->bm->interval_charging * HZ);
1658 else
1659 queue_delayed_work(di->chargalg_wq,
1660 &di->chargalg_periodic_work,
1661 di->bm->interval_not_charging * HZ);
1662 }
1663
1664 /**
1665 * abx500_chargalg_wd_work() - periodic work to kick the charger watchdog
1666 * @work: pointer to the work_struct structure
1667 *
1668 * Work queue function for kicking the charger watchdog
1669 */
abx500_chargalg_wd_work(struct work_struct * work)1670 static void abx500_chargalg_wd_work(struct work_struct *work)
1671 {
1672 int ret;
1673 struct abx500_chargalg *di = container_of(work,
1674 struct abx500_chargalg, chargalg_wd_work.work);
1675
1676 dev_dbg(di->dev, "abx500_chargalg_wd_work\n");
1677
1678 ret = abx500_chargalg_kick_watchdog(di);
1679 if (ret < 0)
1680 dev_err(di->dev, "failed to kick watchdog\n");
1681
1682 queue_delayed_work(di->chargalg_wq,
1683 &di->chargalg_wd_work, CHG_WD_INTERVAL);
1684 }
1685
1686 /**
1687 * abx500_chargalg_work() - Work to run the charging algorithm instantly
1688 * @work: pointer to the work_struct structure
1689 *
1690 * Work queue function for calling the charging algorithm
1691 */
abx500_chargalg_work(struct work_struct * work)1692 static void abx500_chargalg_work(struct work_struct *work)
1693 {
1694 struct abx500_chargalg *di = container_of(work,
1695 struct abx500_chargalg, chargalg_work);
1696
1697 abx500_chargalg_algorithm(di);
1698 }
1699
1700 /**
1701 * abx500_chargalg_get_property() - get the chargalg properties
1702 * @psy: pointer to the power_supply structure
1703 * @psp: pointer to the power_supply_property structure
1704 * @val: pointer to the power_supply_propval union
1705 *
1706 * This function gets called when an application tries to get the
1707 * chargalg properties by reading the sysfs files.
1708 * status: charging/discharging/full/unknown
1709 * health: health of the battery
1710 * Returns error code in case of failure else 0 on success
1711 */
abx500_chargalg_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)1712 static int abx500_chargalg_get_property(struct power_supply *psy,
1713 enum power_supply_property psp,
1714 union power_supply_propval *val)
1715 {
1716 struct abx500_chargalg *di = power_supply_get_drvdata(psy);
1717
1718 switch (psp) {
1719 case POWER_SUPPLY_PROP_STATUS:
1720 val->intval = di->charge_status;
1721 break;
1722 case POWER_SUPPLY_PROP_HEALTH:
1723 if (di->events.batt_ovv) {
1724 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
1725 } else if (di->events.btemp_underover) {
1726 if (di->batt_data.temp <= di->bm->temp_under)
1727 val->intval = POWER_SUPPLY_HEALTH_COLD;
1728 else
1729 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
1730 } else if (di->charge_state == STATE_SAFETY_TIMER_EXPIRED ||
1731 di->charge_state == STATE_SAFETY_TIMER_EXPIRED_INIT) {
1732 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
1733 } else {
1734 val->intval = POWER_SUPPLY_HEALTH_GOOD;
1735 }
1736 break;
1737 default:
1738 return -EINVAL;
1739 }
1740 return 0;
1741 }
1742
1743 /* Exposure to the sysfs interface */
1744
abx500_chargalg_curr_step_show(struct abx500_chargalg * di,char * buf)1745 static ssize_t abx500_chargalg_curr_step_show(struct abx500_chargalg *di,
1746 char *buf)
1747 {
1748 return sprintf(buf, "%d\n", di->curr_status.curr_step);
1749 }
1750
abx500_chargalg_curr_step_store(struct abx500_chargalg * di,const char * buf,size_t length)1751 static ssize_t abx500_chargalg_curr_step_store(struct abx500_chargalg *di,
1752 const char *buf, size_t length)
1753 {
1754 long int param;
1755 int ret;
1756
1757 ret = kstrtol(buf, 10, ¶m);
1758 if (ret < 0)
1759 return ret;
1760
1761 di->curr_status.curr_step = param;
1762 if (di->curr_status.curr_step >= CHARGALG_CURR_STEP_LOW &&
1763 di->curr_status.curr_step <= CHARGALG_CURR_STEP_HIGH) {
1764 di->curr_status.curr_step_change = true;
1765 queue_work(di->chargalg_wq, &di->chargalg_work);
1766 } else
1767 dev_info(di->dev, "Wrong current step\n"
1768 "Enter 0. Disable AC/USB Charging\n"
1769 "1--100. Set AC/USB charging current step\n"
1770 "100. Enable AC/USB Charging\n");
1771
1772 return strlen(buf);
1773 }
1774
1775
abx500_chargalg_en_show(struct abx500_chargalg * di,char * buf)1776 static ssize_t abx500_chargalg_en_show(struct abx500_chargalg *di,
1777 char *buf)
1778 {
1779 return sprintf(buf, "%d\n",
1780 di->susp_status.ac_suspended &&
1781 di->susp_status.usb_suspended);
1782 }
1783
abx500_chargalg_en_store(struct abx500_chargalg * di,const char * buf,size_t length)1784 static ssize_t abx500_chargalg_en_store(struct abx500_chargalg *di,
1785 const char *buf, size_t length)
1786 {
1787 long int param;
1788 int ac_usb;
1789 int ret;
1790
1791 ret = kstrtol(buf, 10, ¶m);
1792 if (ret < 0)
1793 return ret;
1794
1795 ac_usb = param;
1796 switch (ac_usb) {
1797 case 0:
1798 /* Disable charging */
1799 di->susp_status.ac_suspended = true;
1800 di->susp_status.usb_suspended = true;
1801 di->susp_status.suspended_change = true;
1802 /* Trigger a state change */
1803 queue_work(di->chargalg_wq,
1804 &di->chargalg_work);
1805 break;
1806 case 1:
1807 /* Enable AC Charging */
1808 di->susp_status.ac_suspended = false;
1809 di->susp_status.suspended_change = true;
1810 /* Trigger a state change */
1811 queue_work(di->chargalg_wq,
1812 &di->chargalg_work);
1813 break;
1814 case 2:
1815 /* Enable USB charging */
1816 di->susp_status.usb_suspended = false;
1817 di->susp_status.suspended_change = true;
1818 /* Trigger a state change */
1819 queue_work(di->chargalg_wq,
1820 &di->chargalg_work);
1821 break;
1822 default:
1823 dev_info(di->dev, "Wrong input\n"
1824 "Enter 0. Disable AC/USB Charging\n"
1825 "1. Enable AC charging\n"
1826 "2. Enable USB Charging\n");
1827 }
1828 return strlen(buf);
1829 }
1830
1831 static struct abx500_chargalg_sysfs_entry abx500_chargalg_en_charger =
1832 __ATTR(chargalg, 0644, abx500_chargalg_en_show,
1833 abx500_chargalg_en_store);
1834
1835 static struct abx500_chargalg_sysfs_entry abx500_chargalg_curr_step =
1836 __ATTR(chargalg_curr_step, 0644, abx500_chargalg_curr_step_show,
1837 abx500_chargalg_curr_step_store);
1838
abx500_chargalg_sysfs_show(struct kobject * kobj,struct attribute * attr,char * buf)1839 static ssize_t abx500_chargalg_sysfs_show(struct kobject *kobj,
1840 struct attribute *attr, char *buf)
1841 {
1842 struct abx500_chargalg_sysfs_entry *entry = container_of(attr,
1843 struct abx500_chargalg_sysfs_entry, attr);
1844
1845 struct abx500_chargalg *di = container_of(kobj,
1846 struct abx500_chargalg, chargalg_kobject);
1847
1848 if (!entry->show)
1849 return -EIO;
1850
1851 return entry->show(di, buf);
1852 }
1853
abx500_chargalg_sysfs_charger(struct kobject * kobj,struct attribute * attr,const char * buf,size_t length)1854 static ssize_t abx500_chargalg_sysfs_charger(struct kobject *kobj,
1855 struct attribute *attr, const char *buf, size_t length)
1856 {
1857 struct abx500_chargalg_sysfs_entry *entry = container_of(attr,
1858 struct abx500_chargalg_sysfs_entry, attr);
1859
1860 struct abx500_chargalg *di = container_of(kobj,
1861 struct abx500_chargalg, chargalg_kobject);
1862
1863 if (!entry->store)
1864 return -EIO;
1865
1866 return entry->store(di, buf, length);
1867 }
1868
1869 static struct attribute *abx500_chargalg_chg[] = {
1870 &abx500_chargalg_en_charger.attr,
1871 &abx500_chargalg_curr_step.attr,
1872 NULL,
1873 };
1874
1875 static const struct sysfs_ops abx500_chargalg_sysfs_ops = {
1876 .show = abx500_chargalg_sysfs_show,
1877 .store = abx500_chargalg_sysfs_charger,
1878 };
1879
1880 static struct kobj_type abx500_chargalg_ktype = {
1881 .sysfs_ops = &abx500_chargalg_sysfs_ops,
1882 .default_attrs = abx500_chargalg_chg,
1883 };
1884
1885 /**
1886 * abx500_chargalg_sysfs_exit() - de-init of sysfs entry
1887 * @di: pointer to the struct abx500_chargalg
1888 *
1889 * This function removes the entry in sysfs.
1890 */
abx500_chargalg_sysfs_exit(struct abx500_chargalg * di)1891 static void abx500_chargalg_sysfs_exit(struct abx500_chargalg *di)
1892 {
1893 kobject_del(&di->chargalg_kobject);
1894 }
1895
1896 /**
1897 * abx500_chargalg_sysfs_init() - init of sysfs entry
1898 * @di: pointer to the struct abx500_chargalg
1899 *
1900 * This function adds an entry in sysfs.
1901 * Returns error code in case of failure else 0(on success)
1902 */
abx500_chargalg_sysfs_init(struct abx500_chargalg * di)1903 static int abx500_chargalg_sysfs_init(struct abx500_chargalg *di)
1904 {
1905 int ret = 0;
1906
1907 ret = kobject_init_and_add(&di->chargalg_kobject,
1908 &abx500_chargalg_ktype,
1909 NULL, "abx500_chargalg");
1910 if (ret < 0)
1911 dev_err(di->dev, "failed to create sysfs entry\n");
1912
1913 return ret;
1914 }
1915 /* Exposure to the sysfs interface <<END>> */
1916
abx500_chargalg_resume(struct device * dev)1917 static int __maybe_unused abx500_chargalg_resume(struct device *dev)
1918 {
1919 struct abx500_chargalg *di = dev_get_drvdata(dev);
1920
1921 /* Kick charger watchdog if charging (any charger online) */
1922 if (di->chg_info.online_chg)
1923 queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
1924
1925 /*
1926 * Run the charging algorithm directly to be sure we don't
1927 * do it too seldom
1928 */
1929 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1930
1931 return 0;
1932 }
1933
abx500_chargalg_suspend(struct device * dev)1934 static int __maybe_unused abx500_chargalg_suspend(struct device *dev)
1935 {
1936 struct abx500_chargalg *di = dev_get_drvdata(dev);
1937
1938 if (di->chg_info.online_chg)
1939 cancel_delayed_work_sync(&di->chargalg_wd_work);
1940
1941 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1942
1943 return 0;
1944 }
1945
abx500_chargalg_remove(struct platform_device * pdev)1946 static int abx500_chargalg_remove(struct platform_device *pdev)
1947 {
1948 struct abx500_chargalg *di = platform_get_drvdata(pdev);
1949
1950 /* sysfs interface to enable/disbale charging from user space */
1951 abx500_chargalg_sysfs_exit(di);
1952
1953 hrtimer_cancel(&di->safety_timer);
1954 hrtimer_cancel(&di->maintenance_timer);
1955
1956 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1957 cancel_delayed_work_sync(&di->chargalg_wd_work);
1958 cancel_work_sync(&di->chargalg_work);
1959
1960 /* Delete the work queue */
1961 destroy_workqueue(di->chargalg_wq);
1962
1963 power_supply_unregister(di->chargalg_psy);
1964
1965 return 0;
1966 }
1967
1968 static char *supply_interface[] = {
1969 "ab8500_fg",
1970 };
1971
1972 static const struct power_supply_desc abx500_chargalg_desc = {
1973 .name = "abx500_chargalg",
1974 .type = POWER_SUPPLY_TYPE_BATTERY,
1975 .properties = abx500_chargalg_props,
1976 .num_properties = ARRAY_SIZE(abx500_chargalg_props),
1977 .get_property = abx500_chargalg_get_property,
1978 .external_power_changed = abx500_chargalg_external_power_changed,
1979 };
1980
abx500_chargalg_probe(struct platform_device * pdev)1981 static int abx500_chargalg_probe(struct platform_device *pdev)
1982 {
1983 struct device_node *np = pdev->dev.of_node;
1984 struct power_supply_config psy_cfg = {};
1985 struct abx500_chargalg *di;
1986 int ret = 0;
1987
1988 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1989 if (!di) {
1990 dev_err(&pdev->dev, "%s no mem for ab8500_chargalg\n", __func__);
1991 return -ENOMEM;
1992 }
1993
1994 di->bm = &ab8500_bm_data;
1995
1996 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
1997 if (ret) {
1998 dev_err(&pdev->dev, "failed to get battery information\n");
1999 return ret;
2000 }
2001
2002 /* get device struct and parent */
2003 di->dev = &pdev->dev;
2004 di->parent = dev_get_drvdata(pdev->dev.parent);
2005
2006 psy_cfg.supplied_to = supply_interface;
2007 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
2008 psy_cfg.drv_data = di;
2009
2010 /* Initilialize safety timer */
2011 hrtimer_init(&di->safety_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
2012 di->safety_timer.function = abx500_chargalg_safety_timer_expired;
2013
2014 /* Initilialize maintenance timer */
2015 hrtimer_init(&di->maintenance_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
2016 di->maintenance_timer.function =
2017 abx500_chargalg_maintenance_timer_expired;
2018
2019 /* Create a work queue for the chargalg */
2020 di->chargalg_wq = alloc_ordered_workqueue("abx500_chargalg_wq",
2021 WQ_MEM_RECLAIM);
2022 if (di->chargalg_wq == NULL) {
2023 dev_err(di->dev, "failed to create work queue\n");
2024 return -ENOMEM;
2025 }
2026
2027 /* Init work for chargalg */
2028 INIT_DEFERRABLE_WORK(&di->chargalg_periodic_work,
2029 abx500_chargalg_periodic_work);
2030 INIT_DEFERRABLE_WORK(&di->chargalg_wd_work,
2031 abx500_chargalg_wd_work);
2032
2033 /* Init work for chargalg */
2034 INIT_WORK(&di->chargalg_work, abx500_chargalg_work);
2035
2036 /* To detect charger at startup */
2037 di->chg_info.prev_conn_chg = -1;
2038
2039 /* Register chargalg power supply class */
2040 di->chargalg_psy = power_supply_register(di->dev, &abx500_chargalg_desc,
2041 &psy_cfg);
2042 if (IS_ERR(di->chargalg_psy)) {
2043 dev_err(di->dev, "failed to register chargalg psy\n");
2044 ret = PTR_ERR(di->chargalg_psy);
2045 goto free_chargalg_wq;
2046 }
2047
2048 platform_set_drvdata(pdev, di);
2049
2050 /* sysfs interface to enable/disable charging from user space */
2051 ret = abx500_chargalg_sysfs_init(di);
2052 if (ret) {
2053 dev_err(di->dev, "failed to create sysfs entry\n");
2054 goto free_psy;
2055 }
2056 di->curr_status.curr_step = CHARGALG_CURR_STEP_HIGH;
2057
2058 /* Run the charging algorithm */
2059 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
2060
2061 dev_info(di->dev, "probe success\n");
2062 return ret;
2063
2064 free_psy:
2065 power_supply_unregister(di->chargalg_psy);
2066 free_chargalg_wq:
2067 destroy_workqueue(di->chargalg_wq);
2068 return ret;
2069 }
2070
2071 static SIMPLE_DEV_PM_OPS(abx500_chargalg_pm_ops, abx500_chargalg_suspend, abx500_chargalg_resume);
2072
2073 static const struct of_device_id ab8500_chargalg_match[] = {
2074 { .compatible = "stericsson,ab8500-chargalg", },
2075 { },
2076 };
2077
2078 static struct platform_driver abx500_chargalg_driver = {
2079 .probe = abx500_chargalg_probe,
2080 .remove = abx500_chargalg_remove,
2081 .driver = {
2082 .name = "ab8500-chargalg",
2083 .of_match_table = ab8500_chargalg_match,
2084 .pm = &abx500_chargalg_pm_ops,
2085 },
2086 };
2087
2088 module_platform_driver(abx500_chargalg_driver);
2089
2090 MODULE_LICENSE("GPL v2");
2091 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2092 MODULE_ALIAS("platform:abx500-chargalg");
2093 MODULE_DESCRIPTION("abx500 battery charging algorithm");
2094