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 #define CHARGALG_CURR_STEP_LOW 0
50 #define CHARGALG_CURR_STEP_HIGH 100
51
52 enum ab8500_chargers {
53 NO_CHG,
54 AC_CHG,
55 USB_CHG,
56 };
57
58 struct ab8500_chargalg_charger_info {
59 enum ab8500_chargers conn_chg;
60 enum ab8500_chargers prev_conn_chg;
61 enum ab8500_chargers online_chg;
62 enum ab8500_chargers prev_online_chg;
63 enum ab8500_chargers charger_type;
64 bool usb_chg_ok;
65 bool ac_chg_ok;
66 int usb_volt;
67 int usb_curr;
68 int ac_volt;
69 int ac_curr;
70 int usb_vset;
71 int usb_iset;
72 int ac_vset;
73 int ac_iset;
74 };
75
76 struct ab8500_chargalg_suspension_status {
77 bool suspended_change;
78 bool ac_suspended;
79 bool usb_suspended;
80 };
81
82 struct ab8500_chargalg_current_step_status {
83 bool curr_step_change;
84 int curr_step;
85 };
86
87 struct ab8500_chargalg_battery_data {
88 int temp;
89 int volt;
90 int avg_curr;
91 int inst_curr;
92 int percent;
93 };
94
95 enum ab8500_chargalg_states {
96 STATE_HANDHELD_INIT,
97 STATE_HANDHELD,
98 STATE_CHG_NOT_OK_INIT,
99 STATE_CHG_NOT_OK,
100 STATE_HW_TEMP_PROTECT_INIT,
101 STATE_HW_TEMP_PROTECT,
102 STATE_NORMAL_INIT,
103 STATE_NORMAL,
104 STATE_WAIT_FOR_RECHARGE_INIT,
105 STATE_WAIT_FOR_RECHARGE,
106 STATE_MAINTENANCE_A_INIT,
107 STATE_MAINTENANCE_A,
108 STATE_MAINTENANCE_B_INIT,
109 STATE_MAINTENANCE_B,
110 STATE_TEMP_UNDEROVER_INIT,
111 STATE_TEMP_UNDEROVER,
112 STATE_TEMP_LOWHIGH_INIT,
113 STATE_TEMP_LOWHIGH,
114 STATE_SUSPENDED_INIT,
115 STATE_SUSPENDED,
116 STATE_OVV_PROTECT_INIT,
117 STATE_OVV_PROTECT,
118 STATE_SAFETY_TIMER_EXPIRED_INIT,
119 STATE_SAFETY_TIMER_EXPIRED,
120 STATE_BATT_REMOVED_INIT,
121 STATE_BATT_REMOVED,
122 STATE_WD_EXPIRED_INIT,
123 STATE_WD_EXPIRED,
124 };
125
126 static const char * const states[] = {
127 "HANDHELD_INIT",
128 "HANDHELD",
129 "CHG_NOT_OK_INIT",
130 "CHG_NOT_OK",
131 "HW_TEMP_PROTECT_INIT",
132 "HW_TEMP_PROTECT",
133 "NORMAL_INIT",
134 "NORMAL",
135 "WAIT_FOR_RECHARGE_INIT",
136 "WAIT_FOR_RECHARGE",
137 "MAINTENANCE_A_INIT",
138 "MAINTENANCE_A",
139 "MAINTENANCE_B_INIT",
140 "MAINTENANCE_B",
141 "TEMP_UNDEROVER_INIT",
142 "TEMP_UNDEROVER",
143 "TEMP_LOWHIGH_INIT",
144 "TEMP_LOWHIGH",
145 "SUSPENDED_INIT",
146 "SUSPENDED",
147 "OVV_PROTECT_INIT",
148 "OVV_PROTECT",
149 "SAFETY_TIMER_EXPIRED_INIT",
150 "SAFETY_TIMER_EXPIRED",
151 "BATT_REMOVED_INIT",
152 "BATT_REMOVED",
153 "WD_EXPIRED_INIT",
154 "WD_EXPIRED",
155 };
156
157 struct ab8500_chargalg_events {
158 bool batt_unknown;
159 bool mainextchnotok;
160 bool batt_ovv;
161 bool batt_rem;
162 bool btemp_underover;
163 bool btemp_lowhigh;
164 bool main_thermal_prot;
165 bool usb_thermal_prot;
166 bool main_ovv;
167 bool vbus_ovv;
168 bool usbchargernotok;
169 bool safety_timer_expired;
170 bool maintenance_timer_expired;
171 bool ac_wd_expired;
172 bool usb_wd_expired;
173 bool ac_cv_active;
174 bool usb_cv_active;
175 bool vbus_collapsed;
176 };
177
178 /**
179 * struct ab8500_charge_curr_maximization - Charger maximization parameters
180 * @original_iset: the non optimized/maximised charger current
181 * @current_iset: the charging current used at this moment
182 * @test_delta_i: the delta between the current we want to charge and the
183 current that is really going into the battery
184 * @condition_cnt: number of iterations needed before a new charger current
185 is set
186 * @max_current: maximum charger current
187 * @wait_cnt: to avoid too fast current step down in case of charger
188 * voltage collapse, we insert this delay between step
189 * down
190 * @level: tells in how many steps the charging current has been
191 increased
192 */
193 struct ab8500_charge_curr_maximization {
194 int original_iset;
195 int current_iset;
196 int test_delta_i;
197 int condition_cnt;
198 int max_current;
199 int wait_cnt;
200 u8 level;
201 };
202
203 enum maxim_ret {
204 MAXIM_RET_NOACTION,
205 MAXIM_RET_CHANGE,
206 MAXIM_RET_IBAT_TOO_HIGH,
207 };
208
209 /**
210 * struct ab8500_chargalg - ab8500 Charging algorithm device information
211 * @dev: pointer to the structure device
212 * @charge_status: battery operating status
213 * @eoc_cnt: counter used to determine end-of_charge
214 * @maintenance_chg: indicate if maintenance charge is active
215 * @t_hyst_norm temperature hysteresis when the temperature has been
216 * over or under normal limits
217 * @t_hyst_lowhigh temperature hysteresis when the temperature has been
218 * over or under the high or low limits
219 * @charge_state: current state of the charging algorithm
220 * @ccm charging current maximization parameters
221 * @chg_info: information about connected charger types
222 * @batt_data: data of the battery
223 * @susp_status: current charger suspension status
224 * @bm: Platform specific battery management information
225 * @curr_status: Current step status for over-current protection
226 * @parent: pointer to the struct ab8500
227 * @chargalg_psy: structure that holds the battery properties exposed by
228 * the charging algorithm
229 * @events: structure for information about events triggered
230 * @chargalg_wq: work queue for running the charging algorithm
231 * @chargalg_periodic_work: work to run the charging algorithm periodically
232 * @chargalg_wd_work: work to kick the charger watchdog periodically
233 * @chargalg_work: work to run the charging algorithm instantly
234 * @safety_timer: charging safety timer
235 * @maintenance_timer: maintenance charging timer
236 * @chargalg_kobject: structure of type kobject
237 */
238 struct ab8500_chargalg {
239 struct device *dev;
240 int charge_status;
241 int eoc_cnt;
242 bool maintenance_chg;
243 int t_hyst_norm;
244 int t_hyst_lowhigh;
245 enum ab8500_chargalg_states charge_state;
246 struct ab8500_charge_curr_maximization ccm;
247 struct ab8500_chargalg_charger_info chg_info;
248 struct ab8500_chargalg_battery_data batt_data;
249 struct ab8500_chargalg_suspension_status susp_status;
250 struct ab8500 *parent;
251 struct ab8500_chargalg_current_step_status curr_status;
252 struct ab8500_bm_data *bm;
253 struct power_supply *chargalg_psy;
254 struct ux500_charger *ac_chg;
255 struct ux500_charger *usb_chg;
256 struct ab8500_chargalg_events events;
257 struct workqueue_struct *chargalg_wq;
258 struct delayed_work chargalg_periodic_work;
259 struct delayed_work chargalg_wd_work;
260 struct work_struct chargalg_work;
261 struct hrtimer safety_timer;
262 struct hrtimer maintenance_timer;
263 struct kobject chargalg_kobject;
264 };
265
266 /*External charger prepare notifier*/
267 BLOCKING_NOTIFIER_HEAD(charger_notifier_list);
268
269 /* Main battery properties */
270 static enum power_supply_property ab8500_chargalg_props[] = {
271 POWER_SUPPLY_PROP_STATUS,
272 POWER_SUPPLY_PROP_HEALTH,
273 };
274
275 struct ab8500_chargalg_sysfs_entry {
276 struct attribute attr;
277 ssize_t (*show)(struct ab8500_chargalg *di, char *buf);
278 ssize_t (*store)(struct ab8500_chargalg *di, const char *buf, size_t length);
279 };
280
281 /**
282 * ab8500_chargalg_safety_timer_expired() - Expiration of the safety timer
283 * @timer: pointer to the hrtimer structure
284 *
285 * This function gets called when the safety timer for the charger
286 * expires
287 */
288 static enum hrtimer_restart
ab8500_chargalg_safety_timer_expired(struct hrtimer * timer)289 ab8500_chargalg_safety_timer_expired(struct hrtimer *timer)
290 {
291 struct ab8500_chargalg *di = container_of(timer, struct ab8500_chargalg,
292 safety_timer);
293 dev_err(di->dev, "Safety timer expired\n");
294 di->events.safety_timer_expired = true;
295
296 /* Trigger execution of the algorithm instantly */
297 queue_work(di->chargalg_wq, &di->chargalg_work);
298
299 return HRTIMER_NORESTART;
300 }
301
302 /**
303 * ab8500_chargalg_maintenance_timer_expired() - Expiration of
304 * the maintenance timer
305 * @timer: pointer to the timer structure
306 *
307 * This function gets called when the maintenence timer
308 * expires
309 */
310 static enum hrtimer_restart
ab8500_chargalg_maintenance_timer_expired(struct hrtimer * timer)311 ab8500_chargalg_maintenance_timer_expired(struct hrtimer *timer)
312 {
313
314 struct ab8500_chargalg *di = container_of(timer, struct ab8500_chargalg,
315 maintenance_timer);
316
317 dev_dbg(di->dev, "Maintenance timer expired\n");
318 di->events.maintenance_timer_expired = true;
319
320 /* Trigger execution of the algorithm instantly */
321 queue_work(di->chargalg_wq, &di->chargalg_work);
322
323 return HRTIMER_NORESTART;
324 }
325
326 /**
327 * ab8500_chargalg_state_to() - Change charge state
328 * @di: pointer to the ab8500_chargalg structure
329 *
330 * This function gets called when a charge state change should occur
331 */
ab8500_chargalg_state_to(struct ab8500_chargalg * di,enum ab8500_chargalg_states state)332 static void ab8500_chargalg_state_to(struct ab8500_chargalg *di,
333 enum ab8500_chargalg_states state)
334 {
335 dev_dbg(di->dev,
336 "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
337 di->charge_state == state ? "NO" : "YES",
338 di->charge_state,
339 states[di->charge_state],
340 state,
341 states[state]);
342
343 di->charge_state = state;
344 }
345
ab8500_chargalg_check_charger_enable(struct ab8500_chargalg * di)346 static int ab8500_chargalg_check_charger_enable(struct ab8500_chargalg *di)
347 {
348 switch (di->charge_state) {
349 case STATE_NORMAL:
350 case STATE_MAINTENANCE_A:
351 case STATE_MAINTENANCE_B:
352 break;
353 default:
354 return 0;
355 }
356
357 if (di->chg_info.charger_type & USB_CHG) {
358 return di->usb_chg->ops.check_enable(di->usb_chg,
359 di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
360 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
361 } else if ((di->chg_info.charger_type & AC_CHG) &&
362 !(di->ac_chg->external)) {
363 return di->ac_chg->ops.check_enable(di->ac_chg,
364 di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
365 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
366 }
367 return 0;
368 }
369
370 /**
371 * ab8500_chargalg_check_charger_connection() - Check charger connection change
372 * @di: pointer to the ab8500_chargalg structure
373 *
374 * This function will check if there is a change in the charger connection
375 * and change charge state accordingly. AC has precedence over USB.
376 */
ab8500_chargalg_check_charger_connection(struct ab8500_chargalg * di)377 static int ab8500_chargalg_check_charger_connection(struct ab8500_chargalg *di)
378 {
379 if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg ||
380 di->susp_status.suspended_change) {
381 /*
382 * Charger state changed or suspension
383 * has changed since last update
384 */
385 if ((di->chg_info.conn_chg & AC_CHG) &&
386 !di->susp_status.ac_suspended) {
387 dev_dbg(di->dev, "Charging source is AC\n");
388 if (di->chg_info.charger_type != AC_CHG) {
389 di->chg_info.charger_type = AC_CHG;
390 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
391 }
392 } else if ((di->chg_info.conn_chg & USB_CHG) &&
393 !di->susp_status.usb_suspended) {
394 dev_dbg(di->dev, "Charging source is USB\n");
395 di->chg_info.charger_type = USB_CHG;
396 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
397 } else if (di->chg_info.conn_chg &&
398 (di->susp_status.ac_suspended ||
399 di->susp_status.usb_suspended)) {
400 dev_dbg(di->dev, "Charging is suspended\n");
401 di->chg_info.charger_type = NO_CHG;
402 ab8500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
403 } else {
404 dev_dbg(di->dev, "Charging source is OFF\n");
405 di->chg_info.charger_type = NO_CHG;
406 ab8500_chargalg_state_to(di, STATE_HANDHELD_INIT);
407 }
408 di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
409 di->susp_status.suspended_change = false;
410 }
411 return di->chg_info.conn_chg;
412 }
413
414 /**
415 * ab8500_chargalg_check_current_step_status() - Check charging current
416 * step status.
417 * @di: pointer to the ab8500_chargalg structure
418 *
419 * This function will check if there is a change in the charging current step
420 * and change charge state accordingly.
421 */
ab8500_chargalg_check_current_step_status(struct ab8500_chargalg * di)422 static void ab8500_chargalg_check_current_step_status
423 (struct ab8500_chargalg *di)
424 {
425 if (di->curr_status.curr_step_change)
426 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
427 di->curr_status.curr_step_change = false;
428 }
429
430 /**
431 * ab8500_chargalg_start_safety_timer() - Start charging safety timer
432 * @di: pointer to the ab8500_chargalg structure
433 *
434 * The safety timer is used to avoid overcharging of old or bad batteries.
435 * There are different timers for AC and USB
436 */
ab8500_chargalg_start_safety_timer(struct ab8500_chargalg * di)437 static void ab8500_chargalg_start_safety_timer(struct ab8500_chargalg *di)
438 {
439 /* Charger-dependent expiration time in hours*/
440 int timer_expiration = 0;
441
442 switch (di->chg_info.charger_type) {
443 case AC_CHG:
444 timer_expiration = di->bm->main_safety_tmr_h;
445 break;
446
447 case USB_CHG:
448 timer_expiration = di->bm->usb_safety_tmr_h;
449 break;
450
451 default:
452 dev_err(di->dev, "Unknown charger to charge from\n");
453 break;
454 }
455
456 di->events.safety_timer_expired = false;
457 hrtimer_set_expires_range(&di->safety_timer,
458 ktime_set(timer_expiration * ONE_HOUR_IN_SECONDS, 0),
459 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
460 hrtimer_start_expires(&di->safety_timer, HRTIMER_MODE_REL);
461 }
462
463 /**
464 * ab8500_chargalg_stop_safety_timer() - Stop charging safety timer
465 * @di: pointer to the ab8500_chargalg structure
466 *
467 * The safety timer is stopped whenever the NORMAL state is exited
468 */
ab8500_chargalg_stop_safety_timer(struct ab8500_chargalg * di)469 static void ab8500_chargalg_stop_safety_timer(struct ab8500_chargalg *di)
470 {
471 if (hrtimer_try_to_cancel(&di->safety_timer) >= 0)
472 di->events.safety_timer_expired = false;
473 }
474
475 /**
476 * ab8500_chargalg_start_maintenance_timer() - Start charging maintenance timer
477 * @di: pointer to the ab8500_chargalg structure
478 * @duration: duration of ther maintenance timer in hours
479 *
480 * The maintenance timer is used to maintain the charge in the battery once
481 * the battery is considered full. These timers are chosen to match the
482 * discharge curve of the battery
483 */
ab8500_chargalg_start_maintenance_timer(struct ab8500_chargalg * di,int duration)484 static void ab8500_chargalg_start_maintenance_timer(struct ab8500_chargalg *di,
485 int duration)
486 {
487 hrtimer_set_expires_range(&di->maintenance_timer,
488 ktime_set(duration * ONE_HOUR_IN_SECONDS, 0),
489 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
490 di->events.maintenance_timer_expired = false;
491 hrtimer_start_expires(&di->maintenance_timer, HRTIMER_MODE_REL);
492 }
493
494 /**
495 * ab8500_chargalg_stop_maintenance_timer() - Stop maintenance timer
496 * @di: pointer to the ab8500_chargalg structure
497 *
498 * The maintenance timer is stopped whenever maintenance ends or when another
499 * state is entered
500 */
ab8500_chargalg_stop_maintenance_timer(struct ab8500_chargalg * di)501 static void ab8500_chargalg_stop_maintenance_timer(struct ab8500_chargalg *di)
502 {
503 if (hrtimer_try_to_cancel(&di->maintenance_timer) >= 0)
504 di->events.maintenance_timer_expired = false;
505 }
506
507 /**
508 * ab8500_chargalg_kick_watchdog() - Kick charger watchdog
509 * @di: pointer to the ab8500_chargalg structure
510 *
511 * The charger watchdog have to be kicked periodically whenever the charger is
512 * on, else the ABB will reset the system
513 */
ab8500_chargalg_kick_watchdog(struct ab8500_chargalg * di)514 static int ab8500_chargalg_kick_watchdog(struct ab8500_chargalg *di)
515 {
516 /* Check if charger exists and kick watchdog if charging */
517 if (di->ac_chg && di->ac_chg->ops.kick_wd &&
518 di->chg_info.online_chg & AC_CHG) {
519 /*
520 * If AB charger watchdog expired, pm2xxx charging
521 * gets disabled. To be safe, kick both AB charger watchdog
522 * and pm2xxx watchdog.
523 */
524 if (di->ac_chg->external &&
525 di->usb_chg && di->usb_chg->ops.kick_wd)
526 di->usb_chg->ops.kick_wd(di->usb_chg);
527
528 return di->ac_chg->ops.kick_wd(di->ac_chg);
529 } else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
530 di->chg_info.online_chg & USB_CHG)
531 return di->usb_chg->ops.kick_wd(di->usb_chg);
532
533 return -ENXIO;
534 }
535
536 /**
537 * ab8500_chargalg_ac_en() - Turn on/off the AC charger
538 * @di: pointer to the ab8500_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 */
ab8500_chargalg_ac_en(struct ab8500_chargalg * di,int enable,int vset,int iset)546 static int ab8500_chargalg_ac_en(struct ab8500_chargalg *di, int enable,
547 int vset, int iset)
548 {
549 static int ab8500_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 !ab8500_chargalg_ex_ac_enable_toggle) {
566 blocking_notifier_call_chain(&charger_notifier_list,
567 0, di->dev);
568 ab8500_chargalg_ex_ac_enable_toggle++;
569 }
570
571 return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
572 }
573
574 /**
575 * ab8500_chargalg_usb_en() - Turn on/off the USB charger
576 * @di: pointer to the ab8500_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 */
ab8500_chargalg_usb_en(struct ab8500_chargalg * di,int enable,int vset,int iset)584 static int ab8500_chargalg_usb_en(struct ab8500_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 * ab8500_chargalg_update_chg_curr() - Update charger current
604 * @di: pointer to the ab8500_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 */
ab8500_chargalg_update_chg_curr(struct ab8500_chargalg * di,int iset)610 static int ab8500_chargalg_update_chg_curr(struct ab8500_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 * ab8500_chargalg_stop_charging() - Stop charging
645 * @di: pointer to the ab8500_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 */
ab8500_chargalg_stop_charging(struct ab8500_chargalg * di)651 static void ab8500_chargalg_stop_charging(struct ab8500_chargalg *di)
652 {
653 ab8500_chargalg_ac_en(di, false, 0, 0);
654 ab8500_chargalg_usb_en(di, false, 0, 0);
655 ab8500_chargalg_stop_safety_timer(di);
656 ab8500_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 * ab8500_chargalg_hold_charging() - Pauses charging
665 * @di: pointer to the ab8500_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 */
ab8500_chargalg_hold_charging(struct ab8500_chargalg * di)671 static void ab8500_chargalg_hold_charging(struct ab8500_chargalg *di)
672 {
673 ab8500_chargalg_ac_en(di, false, 0, 0);
674 ab8500_chargalg_usb_en(di, false, 0, 0);
675 ab8500_chargalg_stop_safety_timer(di);
676 ab8500_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 * ab8500_chargalg_start_charging() - Start the charger
685 * @di: pointer to the ab8500_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 */
ab8500_chargalg_start_charging(struct ab8500_chargalg * di,int vset,int iset)692 static void ab8500_chargalg_start_charging(struct ab8500_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 ab8500_chargalg_usb_en(di, false, 0, 0);
700 ab8500_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 ab8500_chargalg_ac_en(di, false, 0, 0);
707 ab8500_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 * ab8500_chargalg_check_temp() - Check battery temperature ranges
718 * @di: pointer to the ab8500_chargalg structure
719 *
720 * The battery temperature is checked against the predefined limits and the
721 * charge state is changed accordingly
722 */
ab8500_chargalg_check_temp(struct ab8500_chargalg * di)723 static void ab8500_chargalg_check_temp(struct ab8500_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 * ab8500_chargalg_check_charger_voltage() - Check charger voltage
763 * @di: pointer to the ab8500_chargalg structure
764 *
765 * Charger voltage is checked against maximum limit
766 */
ab8500_chargalg_check_charger_voltage(struct ab8500_chargalg * di)767 static void ab8500_chargalg_check_charger_voltage(struct ab8500_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 * ab8500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
783 * @di: pointer to the ab8500_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 */
ab8500_chargalg_end_of_charge(struct ab8500_chargalg * di)789 static void ab8500_chargalg_end_of_charge(struct ab8500_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 ab8500_chargalg * di)817 static void init_maxim_chg_curr(struct ab8500_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 * ab8500_chargalg_chg_curr_maxim - increases the charger current to
831 * compensate for the system load
832 * @di pointer to the ab8500_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 */
ab8500_chargalg_chg_curr_maxim(struct ab8500_chargalg * di)838 static enum maxim_ret ab8500_chargalg_chg_curr_maxim(struct ab8500_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 ab8500_chargalg * di)910 static void handle_maxim_chg_curr(struct ab8500_chargalg *di)
911 {
912 enum maxim_ret ret;
913 int result;
914
915 ret = ab8500_chargalg_chg_curr_maxim(di);
916 switch (ret) {
917 case MAXIM_RET_CHANGE:
918 result = ab8500_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 = ab8500_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
ab8500_chargalg_get_ext_psy_data(struct device * dev,void * data)937 static int ab8500_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 ab8500_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 break;
1153 default:
1154 break;
1155 }
1156 break;
1157
1158 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1159 switch (ext->desc->type) {
1160 case POWER_SUPPLY_TYPE_BATTERY:
1161 di->batt_data.volt = ret.intval / 1000;
1162 break;
1163 case POWER_SUPPLY_TYPE_MAINS:
1164 di->chg_info.ac_volt = ret.intval / 1000;
1165 break;
1166 case POWER_SUPPLY_TYPE_USB:
1167 di->chg_info.usb_volt = ret.intval / 1000;
1168 break;
1169 default:
1170 break;
1171 }
1172 break;
1173
1174 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
1175 switch (ext->desc->type) {
1176 case POWER_SUPPLY_TYPE_MAINS:
1177 /* AVG is used to indicate when we are
1178 * in CV mode */
1179 if (ret.intval)
1180 di->events.ac_cv_active = true;
1181 else
1182 di->events.ac_cv_active = false;
1183
1184 break;
1185 case POWER_SUPPLY_TYPE_USB:
1186 /* AVG is used to indicate when we are
1187 * in CV mode */
1188 if (ret.intval)
1189 di->events.usb_cv_active = true;
1190 else
1191 di->events.usb_cv_active = false;
1192
1193 break;
1194 default:
1195 break;
1196 }
1197 break;
1198
1199 case POWER_SUPPLY_PROP_TECHNOLOGY:
1200 switch (ext->desc->type) {
1201 case POWER_SUPPLY_TYPE_BATTERY:
1202 if (ret.intval)
1203 di->events.batt_unknown = false;
1204 else
1205 di->events.batt_unknown = true;
1206
1207 break;
1208 default:
1209 break;
1210 }
1211 break;
1212
1213 case POWER_SUPPLY_PROP_TEMP:
1214 di->batt_data.temp = ret.intval / 10;
1215 break;
1216
1217 case POWER_SUPPLY_PROP_CURRENT_NOW:
1218 switch (ext->desc->type) {
1219 case POWER_SUPPLY_TYPE_MAINS:
1220 di->chg_info.ac_curr =
1221 ret.intval / 1000;
1222 break;
1223 case POWER_SUPPLY_TYPE_USB:
1224 di->chg_info.usb_curr =
1225 ret.intval / 1000;
1226 break;
1227 case POWER_SUPPLY_TYPE_BATTERY:
1228 di->batt_data.inst_curr = ret.intval / 1000;
1229 break;
1230 default:
1231 break;
1232 }
1233 break;
1234
1235 case POWER_SUPPLY_PROP_CURRENT_AVG:
1236 switch (ext->desc->type) {
1237 case POWER_SUPPLY_TYPE_BATTERY:
1238 di->batt_data.avg_curr = ret.intval / 1000;
1239 break;
1240 case POWER_SUPPLY_TYPE_USB:
1241 if (ret.intval)
1242 di->events.vbus_collapsed = true;
1243 else
1244 di->events.vbus_collapsed = false;
1245 break;
1246 default:
1247 break;
1248 }
1249 break;
1250 case POWER_SUPPLY_PROP_CAPACITY:
1251 if (!capacity_updated)
1252 di->batt_data.percent = ret.intval;
1253 break;
1254 default:
1255 break;
1256 }
1257 }
1258 return 0;
1259 }
1260
1261 /**
1262 * ab8500_chargalg_external_power_changed() - callback for power supply changes
1263 * @psy: pointer to the structure power_supply
1264 *
1265 * This function is the entry point of the pointer external_power_changed
1266 * of the structure power_supply.
1267 * This function gets executed when there is a change in any external power
1268 * supply that this driver needs to be notified of.
1269 */
ab8500_chargalg_external_power_changed(struct power_supply * psy)1270 static void ab8500_chargalg_external_power_changed(struct power_supply *psy)
1271 {
1272 struct ab8500_chargalg *di = power_supply_get_drvdata(psy);
1273
1274 /*
1275 * Trigger execution of the algorithm instantly and read
1276 * all power_supply properties there instead
1277 */
1278 if (di->chargalg_wq)
1279 queue_work(di->chargalg_wq, &di->chargalg_work);
1280 }
1281
1282 /**
1283 * ab8500_chargalg_algorithm() - Main function for the algorithm
1284 * @di: pointer to the ab8500_chargalg structure
1285 *
1286 * This is the main control function for the charging algorithm.
1287 * It is called periodically or when something happens that will
1288 * trigger a state change
1289 */
ab8500_chargalg_algorithm(struct ab8500_chargalg * di)1290 static void ab8500_chargalg_algorithm(struct ab8500_chargalg *di)
1291 {
1292 int charger_status;
1293 int ret;
1294 int curr_step_lvl;
1295
1296 /* Collect data from all power_supply class devices */
1297 class_for_each_device(power_supply_class, NULL,
1298 di->chargalg_psy, ab8500_chargalg_get_ext_psy_data);
1299
1300 ab8500_chargalg_end_of_charge(di);
1301 ab8500_chargalg_check_temp(di);
1302 ab8500_chargalg_check_charger_voltage(di);
1303
1304 charger_status = ab8500_chargalg_check_charger_connection(di);
1305 ab8500_chargalg_check_current_step_status(di);
1306
1307 if (is_ab8500(di->parent)) {
1308 ret = ab8500_chargalg_check_charger_enable(di);
1309 if (ret < 0)
1310 dev_err(di->dev, "Checking charger is enabled error"
1311 ": Returned Value %d\n", ret);
1312 }
1313
1314 /*
1315 * First check if we have a charger connected.
1316 * Also we don't allow charging of unknown batteries if configured
1317 * this way
1318 */
1319 if (!charger_status ||
1320 (di->events.batt_unknown && !di->bm->chg_unknown_bat)) {
1321 if (di->charge_state != STATE_HANDHELD) {
1322 di->events.safety_timer_expired = false;
1323 ab8500_chargalg_state_to(di, STATE_HANDHELD_INIT);
1324 }
1325 }
1326
1327 /* If suspended, we should not continue checking the flags */
1328 else if (di->charge_state == STATE_SUSPENDED_INIT ||
1329 di->charge_state == STATE_SUSPENDED) {
1330 /* We don't do anything here, just don,t continue */
1331 }
1332
1333 /* Safety timer expiration */
1334 else if (di->events.safety_timer_expired) {
1335 if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
1336 ab8500_chargalg_state_to(di,
1337 STATE_SAFETY_TIMER_EXPIRED_INIT);
1338 }
1339 /*
1340 * Check if any interrupts has occured
1341 * that will prevent us from charging
1342 */
1343
1344 /* Battery removed */
1345 else if (di->events.batt_rem) {
1346 if (di->charge_state != STATE_BATT_REMOVED)
1347 ab8500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
1348 }
1349 /* Main or USB charger not ok. */
1350 else if (di->events.mainextchnotok || di->events.usbchargernotok) {
1351 /*
1352 * If vbus_collapsed is set, we have to lower the charger
1353 * current, which is done in the normal state below
1354 */
1355 if (di->charge_state != STATE_CHG_NOT_OK &&
1356 !di->events.vbus_collapsed)
1357 ab8500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
1358 }
1359 /* VBUS, Main or VBAT OVV. */
1360 else if (di->events.vbus_ovv ||
1361 di->events.main_ovv ||
1362 di->events.batt_ovv ||
1363 !di->chg_info.usb_chg_ok ||
1364 !di->chg_info.ac_chg_ok) {
1365 if (di->charge_state != STATE_OVV_PROTECT)
1366 ab8500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
1367 }
1368 /* USB Thermal, stop charging */
1369 else if (di->events.main_thermal_prot ||
1370 di->events.usb_thermal_prot) {
1371 if (di->charge_state != STATE_HW_TEMP_PROTECT)
1372 ab8500_chargalg_state_to(di,
1373 STATE_HW_TEMP_PROTECT_INIT);
1374 }
1375 /* Battery temp over/under */
1376 else if (di->events.btemp_underover) {
1377 if (di->charge_state != STATE_TEMP_UNDEROVER)
1378 ab8500_chargalg_state_to(di,
1379 STATE_TEMP_UNDEROVER_INIT);
1380 }
1381 /* Watchdog expired */
1382 else if (di->events.ac_wd_expired ||
1383 di->events.usb_wd_expired) {
1384 if (di->charge_state != STATE_WD_EXPIRED)
1385 ab8500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
1386 }
1387 /* Battery temp high/low */
1388 else if (di->events.btemp_lowhigh) {
1389 if (di->charge_state != STATE_TEMP_LOWHIGH)
1390 ab8500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
1391 }
1392
1393 dev_dbg(di->dev,
1394 "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
1395 "State %s Active_chg %d Chg_status %d AC %d USB %d "
1396 "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
1397 "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
1398 di->batt_data.volt,
1399 di->batt_data.avg_curr,
1400 di->batt_data.inst_curr,
1401 di->batt_data.temp,
1402 di->batt_data.percent,
1403 di->maintenance_chg,
1404 states[di->charge_state],
1405 di->chg_info.charger_type,
1406 di->charge_status,
1407 di->chg_info.conn_chg & AC_CHG,
1408 di->chg_info.conn_chg & USB_CHG,
1409 di->chg_info.online_chg & AC_CHG,
1410 di->chg_info.online_chg & USB_CHG,
1411 di->events.ac_cv_active,
1412 di->events.usb_cv_active,
1413 di->chg_info.ac_curr,
1414 di->chg_info.usb_curr,
1415 di->chg_info.ac_vset,
1416 di->chg_info.ac_iset,
1417 di->chg_info.usb_vset,
1418 di->chg_info.usb_iset);
1419
1420 switch (di->charge_state) {
1421 case STATE_HANDHELD_INIT:
1422 ab8500_chargalg_stop_charging(di);
1423 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
1424 ab8500_chargalg_state_to(di, STATE_HANDHELD);
1425 fallthrough;
1426
1427 case STATE_HANDHELD:
1428 break;
1429
1430 case STATE_SUSPENDED_INIT:
1431 if (di->susp_status.ac_suspended)
1432 ab8500_chargalg_ac_en(di, false, 0, 0);
1433 if (di->susp_status.usb_suspended)
1434 ab8500_chargalg_usb_en(di, false, 0, 0);
1435 ab8500_chargalg_stop_safety_timer(di);
1436 ab8500_chargalg_stop_maintenance_timer(di);
1437 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1438 di->maintenance_chg = false;
1439 ab8500_chargalg_state_to(di, STATE_SUSPENDED);
1440 power_supply_changed(di->chargalg_psy);
1441 fallthrough;
1442
1443 case STATE_SUSPENDED:
1444 /* CHARGING is suspended */
1445 break;
1446
1447 case STATE_BATT_REMOVED_INIT:
1448 ab8500_chargalg_stop_charging(di);
1449 ab8500_chargalg_state_to(di, STATE_BATT_REMOVED);
1450 fallthrough;
1451
1452 case STATE_BATT_REMOVED:
1453 if (!di->events.batt_rem)
1454 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1455 break;
1456
1457 case STATE_HW_TEMP_PROTECT_INIT:
1458 ab8500_chargalg_stop_charging(di);
1459 ab8500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
1460 fallthrough;
1461
1462 case STATE_HW_TEMP_PROTECT:
1463 if (!di->events.main_thermal_prot &&
1464 !di->events.usb_thermal_prot)
1465 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1466 break;
1467
1468 case STATE_OVV_PROTECT_INIT:
1469 ab8500_chargalg_stop_charging(di);
1470 ab8500_chargalg_state_to(di, STATE_OVV_PROTECT);
1471 fallthrough;
1472
1473 case STATE_OVV_PROTECT:
1474 if (!di->events.vbus_ovv &&
1475 !di->events.main_ovv &&
1476 !di->events.batt_ovv &&
1477 di->chg_info.usb_chg_ok &&
1478 di->chg_info.ac_chg_ok)
1479 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1480 break;
1481
1482 case STATE_CHG_NOT_OK_INIT:
1483 ab8500_chargalg_stop_charging(di);
1484 ab8500_chargalg_state_to(di, STATE_CHG_NOT_OK);
1485 fallthrough;
1486
1487 case STATE_CHG_NOT_OK:
1488 if (!di->events.mainextchnotok &&
1489 !di->events.usbchargernotok)
1490 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1491 break;
1492
1493 case STATE_SAFETY_TIMER_EXPIRED_INIT:
1494 ab8500_chargalg_stop_charging(di);
1495 ab8500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
1496 fallthrough;
1497
1498 case STATE_SAFETY_TIMER_EXPIRED:
1499 /* We exit this state when charger is removed */
1500 break;
1501
1502 case STATE_NORMAL_INIT:
1503 if (di->curr_status.curr_step == CHARGALG_CURR_STEP_LOW)
1504 ab8500_chargalg_stop_charging(di);
1505 else {
1506 curr_step_lvl = di->bm->bat_type[
1507 di->bm->batt_id].normal_cur_lvl
1508 * di->curr_status.curr_step
1509 / CHARGALG_CURR_STEP_HIGH;
1510 ab8500_chargalg_start_charging(di,
1511 di->bm->bat_type[di->bm->batt_id]
1512 .normal_vol_lvl, curr_step_lvl);
1513 }
1514
1515 ab8500_chargalg_state_to(di, STATE_NORMAL);
1516 ab8500_chargalg_start_safety_timer(di);
1517 ab8500_chargalg_stop_maintenance_timer(di);
1518 init_maxim_chg_curr(di);
1519 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1520 di->eoc_cnt = 0;
1521 di->maintenance_chg = false;
1522 power_supply_changed(di->chargalg_psy);
1523
1524 break;
1525
1526 case STATE_NORMAL:
1527 handle_maxim_chg_curr(di);
1528 if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
1529 di->maintenance_chg) {
1530 if (di->bm->no_maintenance)
1531 ab8500_chargalg_state_to(di,
1532 STATE_WAIT_FOR_RECHARGE_INIT);
1533 else
1534 ab8500_chargalg_state_to(di,
1535 STATE_MAINTENANCE_A_INIT);
1536 }
1537 break;
1538
1539 /* This state will be used when the maintenance state is disabled */
1540 case STATE_WAIT_FOR_RECHARGE_INIT:
1541 ab8500_chargalg_hold_charging(di);
1542 ab8500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
1543 fallthrough;
1544
1545 case STATE_WAIT_FOR_RECHARGE:
1546 if (di->batt_data.percent <=
1547 di->bm->bat_type[di->bm->batt_id].recharge_cap)
1548 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1549 break;
1550
1551 case STATE_MAINTENANCE_A_INIT:
1552 ab8500_chargalg_stop_safety_timer(di);
1553 ab8500_chargalg_start_maintenance_timer(di,
1554 di->bm->bat_type[
1555 di->bm->batt_id].maint_a_chg_timer_h);
1556 ab8500_chargalg_start_charging(di,
1557 di->bm->bat_type[
1558 di->bm->batt_id].maint_a_vol_lvl,
1559 di->bm->bat_type[
1560 di->bm->batt_id].maint_a_cur_lvl);
1561 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_A);
1562 power_supply_changed(di->chargalg_psy);
1563 fallthrough;
1564
1565 case STATE_MAINTENANCE_A:
1566 if (di->events.maintenance_timer_expired) {
1567 ab8500_chargalg_stop_maintenance_timer(di);
1568 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
1569 }
1570 break;
1571
1572 case STATE_MAINTENANCE_B_INIT:
1573 ab8500_chargalg_start_maintenance_timer(di,
1574 di->bm->bat_type[
1575 di->bm->batt_id].maint_b_chg_timer_h);
1576 ab8500_chargalg_start_charging(di,
1577 di->bm->bat_type[
1578 di->bm->batt_id].maint_b_vol_lvl,
1579 di->bm->bat_type[
1580 di->bm->batt_id].maint_b_cur_lvl);
1581 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B);
1582 power_supply_changed(di->chargalg_psy);
1583 fallthrough;
1584
1585 case STATE_MAINTENANCE_B:
1586 if (di->events.maintenance_timer_expired) {
1587 ab8500_chargalg_stop_maintenance_timer(di);
1588 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1589 }
1590 break;
1591
1592 case STATE_TEMP_LOWHIGH_INIT:
1593 ab8500_chargalg_start_charging(di,
1594 di->bm->bat_type[
1595 di->bm->batt_id].low_high_vol_lvl,
1596 di->bm->bat_type[
1597 di->bm->batt_id].low_high_cur_lvl);
1598 ab8500_chargalg_stop_maintenance_timer(di);
1599 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1600 ab8500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
1601 power_supply_changed(di->chargalg_psy);
1602 fallthrough;
1603
1604 case STATE_TEMP_LOWHIGH:
1605 if (!di->events.btemp_lowhigh)
1606 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1607 break;
1608
1609 case STATE_WD_EXPIRED_INIT:
1610 ab8500_chargalg_stop_charging(di);
1611 ab8500_chargalg_state_to(di, STATE_WD_EXPIRED);
1612 fallthrough;
1613
1614 case STATE_WD_EXPIRED:
1615 if (!di->events.ac_wd_expired &&
1616 !di->events.usb_wd_expired)
1617 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1618 break;
1619
1620 case STATE_TEMP_UNDEROVER_INIT:
1621 ab8500_chargalg_stop_charging(di);
1622 ab8500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
1623 fallthrough;
1624
1625 case STATE_TEMP_UNDEROVER:
1626 if (!di->events.btemp_underover)
1627 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1628 break;
1629 }
1630
1631 /* Start charging directly if the new state is a charge state */
1632 if (di->charge_state == STATE_NORMAL_INIT ||
1633 di->charge_state == STATE_MAINTENANCE_A_INIT ||
1634 di->charge_state == STATE_MAINTENANCE_B_INIT)
1635 queue_work(di->chargalg_wq, &di->chargalg_work);
1636 }
1637
1638 /**
1639 * ab8500_chargalg_periodic_work() - Periodic work for the algorithm
1640 * @work: pointer to the work_struct structure
1641 *
1642 * Work queue function for the charging algorithm
1643 */
ab8500_chargalg_periodic_work(struct work_struct * work)1644 static void ab8500_chargalg_periodic_work(struct work_struct *work)
1645 {
1646 struct ab8500_chargalg *di = container_of(work,
1647 struct ab8500_chargalg, chargalg_periodic_work.work);
1648
1649 ab8500_chargalg_algorithm(di);
1650
1651 /*
1652 * If a charger is connected then the battery has to be monitored
1653 * frequently, else the work can be delayed.
1654 */
1655 if (di->chg_info.conn_chg)
1656 queue_delayed_work(di->chargalg_wq,
1657 &di->chargalg_periodic_work,
1658 di->bm->interval_charging * HZ);
1659 else
1660 queue_delayed_work(di->chargalg_wq,
1661 &di->chargalg_periodic_work,
1662 di->bm->interval_not_charging * HZ);
1663 }
1664
1665 /**
1666 * ab8500_chargalg_wd_work() - periodic work to kick the charger watchdog
1667 * @work: pointer to the work_struct structure
1668 *
1669 * Work queue function for kicking the charger watchdog
1670 */
ab8500_chargalg_wd_work(struct work_struct * work)1671 static void ab8500_chargalg_wd_work(struct work_struct *work)
1672 {
1673 int ret;
1674 struct ab8500_chargalg *di = container_of(work,
1675 struct ab8500_chargalg, chargalg_wd_work.work);
1676
1677 ret = ab8500_chargalg_kick_watchdog(di);
1678 if (ret < 0)
1679 dev_err(di->dev, "failed to kick watchdog\n");
1680
1681 queue_delayed_work(di->chargalg_wq,
1682 &di->chargalg_wd_work, CHG_WD_INTERVAL);
1683 }
1684
1685 /**
1686 * ab8500_chargalg_work() - Work to run the charging algorithm instantly
1687 * @work: pointer to the work_struct structure
1688 *
1689 * Work queue function for calling the charging algorithm
1690 */
ab8500_chargalg_work(struct work_struct * work)1691 static void ab8500_chargalg_work(struct work_struct *work)
1692 {
1693 struct ab8500_chargalg *di = container_of(work,
1694 struct ab8500_chargalg, chargalg_work);
1695
1696 ab8500_chargalg_algorithm(di);
1697 }
1698
1699 /**
1700 * ab8500_chargalg_get_property() - get the chargalg properties
1701 * @psy: pointer to the power_supply structure
1702 * @psp: pointer to the power_supply_property structure
1703 * @val: pointer to the power_supply_propval union
1704 *
1705 * This function gets called when an application tries to get the
1706 * chargalg properties by reading the sysfs files.
1707 * status: charging/discharging/full/unknown
1708 * health: health of the battery
1709 * Returns error code in case of failure else 0 on success
1710 */
ab8500_chargalg_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)1711 static int ab8500_chargalg_get_property(struct power_supply *psy,
1712 enum power_supply_property psp,
1713 union power_supply_propval *val)
1714 {
1715 struct ab8500_chargalg *di = power_supply_get_drvdata(psy);
1716
1717 switch (psp) {
1718 case POWER_SUPPLY_PROP_STATUS:
1719 val->intval = di->charge_status;
1720 break;
1721 case POWER_SUPPLY_PROP_HEALTH:
1722 if (di->events.batt_ovv) {
1723 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
1724 } else if (di->events.btemp_underover) {
1725 if (di->batt_data.temp <= di->bm->temp_under)
1726 val->intval = POWER_SUPPLY_HEALTH_COLD;
1727 else
1728 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
1729 } else if (di->charge_state == STATE_SAFETY_TIMER_EXPIRED ||
1730 di->charge_state == STATE_SAFETY_TIMER_EXPIRED_INIT) {
1731 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
1732 } else {
1733 val->intval = POWER_SUPPLY_HEALTH_GOOD;
1734 }
1735 break;
1736 default:
1737 return -EINVAL;
1738 }
1739 return 0;
1740 }
1741
1742 /* Exposure to the sysfs interface */
1743
ab8500_chargalg_curr_step_show(struct ab8500_chargalg * di,char * buf)1744 static ssize_t ab8500_chargalg_curr_step_show(struct ab8500_chargalg *di,
1745 char *buf)
1746 {
1747 return sprintf(buf, "%d\n", di->curr_status.curr_step);
1748 }
1749
ab8500_chargalg_curr_step_store(struct ab8500_chargalg * di,const char * buf,size_t length)1750 static ssize_t ab8500_chargalg_curr_step_store(struct ab8500_chargalg *di,
1751 const char *buf, size_t length)
1752 {
1753 long param;
1754 int ret;
1755
1756 ret = kstrtol(buf, 10, ¶m);
1757 if (ret < 0)
1758 return ret;
1759
1760 di->curr_status.curr_step = param;
1761 if (di->curr_status.curr_step >= CHARGALG_CURR_STEP_LOW &&
1762 di->curr_status.curr_step <= CHARGALG_CURR_STEP_HIGH) {
1763 di->curr_status.curr_step_change = true;
1764 queue_work(di->chargalg_wq, &di->chargalg_work);
1765 } else
1766 dev_info(di->dev, "Wrong current step\n"
1767 "Enter 0. Disable AC/USB Charging\n"
1768 "1--100. Set AC/USB charging current step\n"
1769 "100. Enable AC/USB Charging\n");
1770
1771 return strlen(buf);
1772 }
1773
1774
ab8500_chargalg_en_show(struct ab8500_chargalg * di,char * buf)1775 static ssize_t ab8500_chargalg_en_show(struct ab8500_chargalg *di,
1776 char *buf)
1777 {
1778 return sprintf(buf, "%d\n",
1779 di->susp_status.ac_suspended &&
1780 di->susp_status.usb_suspended);
1781 }
1782
ab8500_chargalg_en_store(struct ab8500_chargalg * di,const char * buf,size_t length)1783 static ssize_t ab8500_chargalg_en_store(struct ab8500_chargalg *di,
1784 const char *buf, size_t length)
1785 {
1786 long param;
1787 int ac_usb;
1788 int ret;
1789
1790 ret = kstrtol(buf, 10, ¶m);
1791 if (ret < 0)
1792 return ret;
1793
1794 ac_usb = param;
1795 switch (ac_usb) {
1796 case 0:
1797 /* Disable charging */
1798 di->susp_status.ac_suspended = true;
1799 di->susp_status.usb_suspended = true;
1800 di->susp_status.suspended_change = true;
1801 /* Trigger a state change */
1802 queue_work(di->chargalg_wq,
1803 &di->chargalg_work);
1804 break;
1805 case 1:
1806 /* Enable AC Charging */
1807 di->susp_status.ac_suspended = false;
1808 di->susp_status.suspended_change = true;
1809 /* Trigger a state change */
1810 queue_work(di->chargalg_wq,
1811 &di->chargalg_work);
1812 break;
1813 case 2:
1814 /* Enable USB charging */
1815 di->susp_status.usb_suspended = false;
1816 di->susp_status.suspended_change = true;
1817 /* Trigger a state change */
1818 queue_work(di->chargalg_wq,
1819 &di->chargalg_work);
1820 break;
1821 default:
1822 dev_info(di->dev, "Wrong input\n"
1823 "Enter 0. Disable AC/USB Charging\n"
1824 "1. Enable AC charging\n"
1825 "2. Enable USB Charging\n");
1826 }
1827 return strlen(buf);
1828 }
1829
1830 static struct ab8500_chargalg_sysfs_entry ab8500_chargalg_en_charger =
1831 __ATTR(chargalg, 0644, ab8500_chargalg_en_show,
1832 ab8500_chargalg_en_store);
1833
1834 static struct ab8500_chargalg_sysfs_entry ab8500_chargalg_curr_step =
1835 __ATTR(chargalg_curr_step, 0644, ab8500_chargalg_curr_step_show,
1836 ab8500_chargalg_curr_step_store);
1837
ab8500_chargalg_sysfs_show(struct kobject * kobj,struct attribute * attr,char * buf)1838 static ssize_t ab8500_chargalg_sysfs_show(struct kobject *kobj,
1839 struct attribute *attr, char *buf)
1840 {
1841 struct ab8500_chargalg_sysfs_entry *entry = container_of(attr,
1842 struct ab8500_chargalg_sysfs_entry, attr);
1843
1844 struct ab8500_chargalg *di = container_of(kobj,
1845 struct ab8500_chargalg, chargalg_kobject);
1846
1847 if (!entry->show)
1848 return -EIO;
1849
1850 return entry->show(di, buf);
1851 }
1852
ab8500_chargalg_sysfs_charger(struct kobject * kobj,struct attribute * attr,const char * buf,size_t length)1853 static ssize_t ab8500_chargalg_sysfs_charger(struct kobject *kobj,
1854 struct attribute *attr, const char *buf, size_t length)
1855 {
1856 struct ab8500_chargalg_sysfs_entry *entry = container_of(attr,
1857 struct ab8500_chargalg_sysfs_entry, attr);
1858
1859 struct ab8500_chargalg *di = container_of(kobj,
1860 struct ab8500_chargalg, chargalg_kobject);
1861
1862 if (!entry->store)
1863 return -EIO;
1864
1865 return entry->store(di, buf, length);
1866 }
1867
1868 static struct attribute *ab8500_chargalg_chg[] = {
1869 &ab8500_chargalg_en_charger.attr,
1870 &ab8500_chargalg_curr_step.attr,
1871 NULL,
1872 };
1873
1874 static const struct sysfs_ops ab8500_chargalg_sysfs_ops = {
1875 .show = ab8500_chargalg_sysfs_show,
1876 .store = ab8500_chargalg_sysfs_charger,
1877 };
1878
1879 static struct kobj_type ab8500_chargalg_ktype = {
1880 .sysfs_ops = &ab8500_chargalg_sysfs_ops,
1881 .default_attrs = ab8500_chargalg_chg,
1882 };
1883
1884 /**
1885 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
1886 * @di: pointer to the struct ab8500_chargalg
1887 *
1888 * This function removes the entry in sysfs.
1889 */
ab8500_chargalg_sysfs_exit(struct ab8500_chargalg * di)1890 static void ab8500_chargalg_sysfs_exit(struct ab8500_chargalg *di)
1891 {
1892 kobject_del(&di->chargalg_kobject);
1893 }
1894
1895 /**
1896 * ab8500_chargalg_sysfs_init() - init of sysfs entry
1897 * @di: pointer to the struct ab8500_chargalg
1898 *
1899 * This function adds an entry in sysfs.
1900 * Returns error code in case of failure else 0(on success)
1901 */
ab8500_chargalg_sysfs_init(struct ab8500_chargalg * di)1902 static int ab8500_chargalg_sysfs_init(struct ab8500_chargalg *di)
1903 {
1904 int ret = 0;
1905
1906 ret = kobject_init_and_add(&di->chargalg_kobject,
1907 &ab8500_chargalg_ktype,
1908 NULL, "ab8500_chargalg");
1909 if (ret < 0)
1910 dev_err(di->dev, "failed to create sysfs entry\n");
1911
1912 return ret;
1913 }
1914 /* Exposure to the sysfs interface <<END>> */
1915
ab8500_chargalg_resume(struct device * dev)1916 static int __maybe_unused ab8500_chargalg_resume(struct device *dev)
1917 {
1918 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1919
1920 /* Kick charger watchdog if charging (any charger online) */
1921 if (di->chg_info.online_chg)
1922 queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
1923
1924 /*
1925 * Run the charging algorithm directly to be sure we don't
1926 * do it too seldom
1927 */
1928 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1929
1930 return 0;
1931 }
1932
ab8500_chargalg_suspend(struct device * dev)1933 static int __maybe_unused ab8500_chargalg_suspend(struct device *dev)
1934 {
1935 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1936
1937 if (di->chg_info.online_chg)
1938 cancel_delayed_work_sync(&di->chargalg_wd_work);
1939
1940 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1941
1942 return 0;
1943 }
1944
1945 static char *supply_interface[] = {
1946 "ab8500_fg",
1947 };
1948
1949 static const struct power_supply_desc ab8500_chargalg_desc = {
1950 .name = "ab8500_chargalg",
1951 .type = POWER_SUPPLY_TYPE_BATTERY,
1952 .properties = ab8500_chargalg_props,
1953 .num_properties = ARRAY_SIZE(ab8500_chargalg_props),
1954 .get_property = ab8500_chargalg_get_property,
1955 .external_power_changed = ab8500_chargalg_external_power_changed,
1956 };
1957
ab8500_chargalg_bind(struct device * dev,struct device * master,void * data)1958 static int ab8500_chargalg_bind(struct device *dev, struct device *master,
1959 void *data)
1960 {
1961 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1962
1963 /* Create a work queue for the chargalg */
1964 di->chargalg_wq = alloc_ordered_workqueue("ab8500_chargalg_wq",
1965 WQ_MEM_RECLAIM);
1966 if (di->chargalg_wq == NULL) {
1967 dev_err(di->dev, "failed to create work queue\n");
1968 return -ENOMEM;
1969 }
1970
1971 /* Run the charging algorithm */
1972 queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1973
1974 return 0;
1975 }
1976
ab8500_chargalg_unbind(struct device * dev,struct device * master,void * data)1977 static void ab8500_chargalg_unbind(struct device *dev, struct device *master,
1978 void *data)
1979 {
1980 struct ab8500_chargalg *di = dev_get_drvdata(dev);
1981
1982 /* Stop all timers and work */
1983 hrtimer_cancel(&di->safety_timer);
1984 hrtimer_cancel(&di->maintenance_timer);
1985
1986 cancel_delayed_work_sync(&di->chargalg_periodic_work);
1987 cancel_delayed_work_sync(&di->chargalg_wd_work);
1988 cancel_work_sync(&di->chargalg_work);
1989
1990 /* Delete the work queue */
1991 destroy_workqueue(di->chargalg_wq);
1992 flush_scheduled_work();
1993 }
1994
1995 static const struct component_ops ab8500_chargalg_component_ops = {
1996 .bind = ab8500_chargalg_bind,
1997 .unbind = ab8500_chargalg_unbind,
1998 };
1999
ab8500_chargalg_probe(struct platform_device * pdev)2000 static int ab8500_chargalg_probe(struct platform_device *pdev)
2001 {
2002 struct device *dev = &pdev->dev;
2003 struct power_supply_config psy_cfg = {};
2004 struct ab8500_chargalg *di;
2005 int ret = 0;
2006
2007 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
2008 if (!di)
2009 return -ENOMEM;
2010
2011 di->bm = &ab8500_bm_data;
2012
2013 /* get device struct and parent */
2014 di->dev = dev;
2015 di->parent = dev_get_drvdata(pdev->dev.parent);
2016
2017 psy_cfg.supplied_to = supply_interface;
2018 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
2019 psy_cfg.drv_data = di;
2020
2021 /* Initilialize safety timer */
2022 hrtimer_init(&di->safety_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2023 di->safety_timer.function = ab8500_chargalg_safety_timer_expired;
2024
2025 /* Initilialize maintenance timer */
2026 hrtimer_init(&di->maintenance_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2027 di->maintenance_timer.function =
2028 ab8500_chargalg_maintenance_timer_expired;
2029
2030 /* Init work for chargalg */
2031 INIT_DEFERRABLE_WORK(&di->chargalg_periodic_work,
2032 ab8500_chargalg_periodic_work);
2033 INIT_DEFERRABLE_WORK(&di->chargalg_wd_work,
2034 ab8500_chargalg_wd_work);
2035
2036 /* Init work for chargalg */
2037 INIT_WORK(&di->chargalg_work, ab8500_chargalg_work);
2038
2039 /* To detect charger at startup */
2040 di->chg_info.prev_conn_chg = -1;
2041
2042 /* Register chargalg power supply class */
2043 di->chargalg_psy = devm_power_supply_register(di->dev,
2044 &ab8500_chargalg_desc,
2045 &psy_cfg);
2046 if (IS_ERR(di->chargalg_psy)) {
2047 dev_err(di->dev, "failed to register chargalg psy\n");
2048 return PTR_ERR(di->chargalg_psy);
2049 }
2050
2051 platform_set_drvdata(pdev, di);
2052
2053 /* sysfs interface to enable/disable charging from user space */
2054 ret = ab8500_chargalg_sysfs_init(di);
2055 if (ret) {
2056 dev_err(di->dev, "failed to create sysfs entry\n");
2057 return ret;
2058 }
2059 di->curr_status.curr_step = CHARGALG_CURR_STEP_HIGH;
2060
2061 dev_info(di->dev, "probe success\n");
2062 return component_add(dev, &ab8500_chargalg_component_ops);
2063 }
2064
ab8500_chargalg_remove(struct platform_device * pdev)2065 static int ab8500_chargalg_remove(struct platform_device *pdev)
2066 {
2067 struct ab8500_chargalg *di = platform_get_drvdata(pdev);
2068
2069 component_del(&pdev->dev, &ab8500_chargalg_component_ops);
2070
2071 /* sysfs interface to enable/disable charging from user space */
2072 ab8500_chargalg_sysfs_exit(di);
2073
2074 return 0;
2075 }
2076
2077 static SIMPLE_DEV_PM_OPS(ab8500_chargalg_pm_ops, ab8500_chargalg_suspend, ab8500_chargalg_resume);
2078
2079 static const struct of_device_id ab8500_chargalg_match[] = {
2080 { .compatible = "stericsson,ab8500-chargalg", },
2081 { },
2082 };
2083
2084 struct platform_driver ab8500_chargalg_driver = {
2085 .probe = ab8500_chargalg_probe,
2086 .remove = ab8500_chargalg_remove,
2087 .driver = {
2088 .name = "ab8500_chargalg",
2089 .of_match_table = ab8500_chargalg_match,
2090 .pm = &ab8500_chargalg_pm_ops,
2091 },
2092 };
2093 MODULE_LICENSE("GPL v2");
2094 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2095 MODULE_ALIAS("platform:ab8500-chargalg");
2096 MODULE_DESCRIPTION("ab8500 battery charging algorithm");
2097