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[linux-2.6-block.git] / drivers / power / max77693_charger.c
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87c2d906
KK		 1/*
2 * max77693_charger.c - Battery charger driver for the Maxim 77693
3 *
4 * Copyright (C) 2014 Samsung Electronics
5 * Krzysztof Kozlowski <k.kozlowski@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/power_supply.h>
21#include <linux/regmap.h>
22#include <linux/mfd/max77693.h>
61b305cd 23#include <linux/mfd/max77693-common.h>
87c2d906
KK		 24#include <linux/mfd/max77693-private.h>
25
297d716f 26#define MAX77693_CHARGER_NAME "max77693-charger"
87c2d906
KK		 27static const char *max77693_charger_model = "MAX77693";
28static const char *max77693_charger_manufacturer = "Maxim Integrated";
29
30struct max77693_charger {
31 struct device *dev;
32 struct max77693_dev *max77693;
297d716f 33 struct power_supply *charger;
87c2d906
KK		 34
35 u32 constant_volt;
36 u32 min_system_volt;
37 u32 thermal_regulation_temp;
38 u32 batttery_overcurrent;
39 u32 charge_input_threshold_volt;
40};
41
1ed522b3 42static int max77693_get_charger_state(struct regmap *regmap, int *val)
87c2d906 43{
1ed522b3 44 int ret;
87c2d906
KK		 45 unsigned int data;
46
1ed522b3
KK		 47 ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
48 if (ret < 0)
49 return ret;
87c2d906
KK		 50
51 data &= CHG_DETAILS_01_CHG_MASK;
52 data >>= CHG_DETAILS_01_CHG_SHIFT;
53
54 switch (data) {
55 case MAX77693_CHARGING_PREQUALIFICATION:
56 case MAX77693_CHARGING_FAST_CONST_CURRENT:
57 case MAX77693_CHARGING_FAST_CONST_VOLTAGE:
58 case MAX77693_CHARGING_TOP_OFF:
59 /* In high temp the charging current is reduced, but still charging */
60 case MAX77693_CHARGING_HIGH_TEMP:
1ed522b3 61 *val = POWER_SUPPLY_STATUS_CHARGING;
87c2d906
KK		 62 break;
63 case MAX77693_CHARGING_DONE:
1ed522b3 64 *val = POWER_SUPPLY_STATUS_FULL;
87c2d906
KK		 65 break;
66 case MAX77693_CHARGING_TIMER_EXPIRED:
67 case MAX77693_CHARGING_THERMISTOR_SUSPEND:
1ed522b3 68 *val = POWER_SUPPLY_STATUS_NOT_CHARGING;
87c2d906
KK		 69 break;
70 case MAX77693_CHARGING_OFF:
71 case MAX77693_CHARGING_OVER_TEMP:
72 case MAX77693_CHARGING_WATCHDOG_EXPIRED:
1ed522b3 73 *val = POWER_SUPPLY_STATUS_DISCHARGING;
87c2d906
KK		 74 break;
75 case MAX77693_CHARGING_RESERVED:
76 default:
1ed522b3 77 *val = POWER_SUPPLY_STATUS_UNKNOWN;
87c2d906
KK		 78 }
79
1ed522b3 80 return 0;
87c2d906
KK		 81}
82
1ed522b3 83static int max77693_get_charge_type(struct regmap *regmap, int *val)
87c2d906 84{
1ed522b3 85 int ret;
87c2d906
KK		 86 unsigned int data;
87
1ed522b3
KK		 88 ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
89 if (ret < 0)
90 return ret;
87c2d906
KK		 91
92 data &= CHG_DETAILS_01_CHG_MASK;
93 data >>= CHG_DETAILS_01_CHG_SHIFT;
94
95 switch (data) {
96 case MAX77693_CHARGING_PREQUALIFICATION:
97 /*
98 * Top-off: trickle or fast? In top-off the current varies between
99 * 100 and 250 mA. It is higher than prequalification current.
100 */
101 case MAX77693_CHARGING_TOP_OFF:
1ed522b3 102 *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
87c2d906
KK		 103 break;
104 case MAX77693_CHARGING_FAST_CONST_CURRENT:
105 case MAX77693_CHARGING_FAST_CONST_VOLTAGE:
106 /* In high temp the charging current is reduced, but still charging */
107 case MAX77693_CHARGING_HIGH_TEMP:
1ed522b3 108 *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
87c2d906
KK		 109 break;
110 case MAX77693_CHARGING_DONE:
111 case MAX77693_CHARGING_TIMER_EXPIRED:
112 case MAX77693_CHARGING_THERMISTOR_SUSPEND:
113 case MAX77693_CHARGING_OFF:
114 case MAX77693_CHARGING_OVER_TEMP:
115 case MAX77693_CHARGING_WATCHDOG_EXPIRED:
1ed522b3 116 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
87c2d906
KK		 117 break;
118 case MAX77693_CHARGING_RESERVED:
119 default:
1ed522b3 120 *val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
87c2d906
KK		 121 }
122
1ed522b3 123 return 0;
87c2d906
KK		 124}
125
126/*
127 * Supported health statuses:
128 * - POWER_SUPPLY_HEALTH_DEAD
129 * - POWER_SUPPLY_HEALTH_GOOD
130 * - POWER_SUPPLY_HEALTH_OVERVOLTAGE
131 * - POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE
132 * - POWER_SUPPLY_HEALTH_UNKNOWN
133 * - POWER_SUPPLY_HEALTH_UNSPEC_FAILURE
134 */
1ed522b3 135static int max77693_get_battery_health(struct regmap *regmap, int *val)
87c2d906 136{
1ed522b3 137 int ret;
87c2d906
KK		 138 unsigned int data;
139
1ed522b3
KK		 140 ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
141 if (ret < 0)
142 return ret;
87c2d906
KK		 143
144 data &= CHG_DETAILS_01_BAT_MASK;
145 data >>= CHG_DETAILS_01_BAT_SHIFT;
146
147 switch (data) {
148 case MAX77693_BATTERY_NOBAT:
1ed522b3 149 *val = POWER_SUPPLY_HEALTH_DEAD;
87c2d906
KK		 150 break;
151 case MAX77693_BATTERY_PREQUALIFICATION:
152 case MAX77693_BATTERY_GOOD:
153 case MAX77693_BATTERY_LOWVOLTAGE:
1ed522b3 154 *val = POWER_SUPPLY_HEALTH_GOOD;
87c2d906
KK		 155 break;
156 case MAX77693_BATTERY_TIMER_EXPIRED:
157 /*
158 * Took longer to charge than expected, charging suspended.
159 * Damaged battery?
160 */
1ed522b3 161 *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
87c2d906
KK		 162 break;
163 case MAX77693_BATTERY_OVERVOLTAGE:
1ed522b3 164 *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
87c2d906
KK		 165 break;
166 case MAX77693_BATTERY_OVERCURRENT:
1ed522b3 167 *val = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
87c2d906
KK		 168 break;
169 case MAX77693_BATTERY_RESERVED:
170 default:
1ed522b3 171 *val = POWER_SUPPLY_HEALTH_UNKNOWN;
87c2d906
KK		 172 break;
173 }
174
1ed522b3 175 return 0;
87c2d906
KK		 176}
177
1ed522b3 178static int max77693_get_present(struct regmap *regmap, int *val)
87c2d906
KK		 179{
180 unsigned int data;
1ed522b3 181 int ret;
87c2d906
KK		 182
183 /*
184 * Read CHG_INT_OK register. High DETBAT bit here should be
185 * equal to value 0x0 in CHG_DETAILS_01/BAT field.
186 */
1ed522b3
KK		 187 ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data);
188 if (ret < 0)
189 return ret;
190
191 *val = (data & CHG_INT_OK_DETBAT_MASK) ? 0 : 1;
192
193 return 0;
87c2d906
KK		 194}
195
1ed522b3 196static int max77693_get_online(struct regmap *regmap, int *val)
87c2d906
KK		 197{
198 unsigned int data;
1ed522b3
KK		 199 int ret;
200
201 ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data);
202 if (ret < 0)
203 return ret;
204
205 *val = (data & CHG_INT_OK_CHGIN_MASK) ? 1 : 0;
87c2d906 206
87c2d906
KK		 207 return 0;
208}
209
210static enum power_supply_property max77693_charger_props[] = {
211 POWER_SUPPLY_PROP_STATUS,
212 POWER_SUPPLY_PROP_CHARGE_TYPE,
213 POWER_SUPPLY_PROP_HEALTH,
214 POWER_SUPPLY_PROP_PRESENT,
215 POWER_SUPPLY_PROP_ONLINE,
216 POWER_SUPPLY_PROP_MODEL_NAME,
217 POWER_SUPPLY_PROP_MANUFACTURER,
218};
219
220static int max77693_charger_get_property(struct power_supply *psy,
221 enum power_supply_property psp,
222 union power_supply_propval *val)
223{
297d716f 224 struct max77693_charger *chg = power_supply_get_drvdata(psy);
87c2d906
KK		 225 struct regmap *regmap = chg->max77693->regmap;
226 int ret = 0;
227
228 switch (psp) {
229 case POWER_SUPPLY_PROP_STATUS:
1ed522b3 230 ret = max77693_get_charger_state(regmap, &val->intval);
87c2d906
KK		 231 break;
232 case POWER_SUPPLY_PROP_CHARGE_TYPE:
1ed522b3 233 ret = max77693_get_charge_type(regmap, &val->intval);
87c2d906
KK		 234 break;
235 case POWER_SUPPLY_PROP_HEALTH:
1ed522b3 236 ret = max77693_get_battery_health(regmap, &val->intval);
87c2d906
KK		 237 break;
238 case POWER_SUPPLY_PROP_PRESENT:
1ed522b3 239 ret = max77693_get_present(regmap, &val->intval);
87c2d906
KK		 240 break;
241 case POWER_SUPPLY_PROP_ONLINE:
1ed522b3 242 ret = max77693_get_online(regmap, &val->intval);
87c2d906
KK		 243 break;
244 case POWER_SUPPLY_PROP_MODEL_NAME:
245 val->strval = max77693_charger_model;
246 break;
247 case POWER_SUPPLY_PROP_MANUFACTURER:
248 val->strval = max77693_charger_manufacturer;
249 break;
250 default:
251 return -EINVAL;
252 }
253
254 return ret;
255}
256
297d716f
KK		 257static const struct power_supply_desc max77693_charger_desc = {
258 .name = MAX77693_CHARGER_NAME,
259 .type = POWER_SUPPLY_TYPE_BATTERY,
260 .properties = max77693_charger_props,
261 .num_properties = ARRAY_SIZE(max77693_charger_props),
262 .get_property = max77693_charger_get_property,
263};
264
87c2d906
KK		 265static ssize_t device_attr_store(struct device *dev,
266 struct device_attribute *attr, const char *buf, size_t count,
267 int (*fn)(struct max77693_charger *, unsigned long))
268{
269 struct max77693_charger *chg = dev_get_drvdata(dev);
270 unsigned long val;
271 int ret;
272
273 ret = kstrtoul(buf, 10, &val);
274 if (ret)
275 return ret;
276
277 ret = fn(chg, val);
278 if (ret)
279 return ret;
280
281 return count;
282}
283
284static ssize_t fast_charge_timer_show(struct device *dev,
285 struct device_attribute *attr, char *buf)
286{
287 struct max77693_charger *chg = dev_get_drvdata(dev);
288 unsigned int data, val;
289 int ret;
290
291 ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_01,
292 &data);
293 if (ret < 0)
294 return ret;
295
296 data &= CHG_CNFG_01_FCHGTIME_MASK;
297 data >>= CHG_CNFG_01_FCHGTIME_SHIFT;
298 switch (data) {
299 case 0x1 ... 0x7:
300 /* Starting from 4 hours, step by 2 hours */
301 val = 4 + (data - 1) * 2;
302 break;
303 case 0x0:
304 default:
305 val = 0;
306 break;
307 }
308
309 return scnprintf(buf, PAGE_SIZE, "%u\n", val);
310}
311
312static int max77693_set_fast_charge_timer(struct max77693_charger *chg,
313 unsigned long hours)
314{
315 unsigned int data;
316
317 /*
318 * 0x00 - disable
319 * 0x01 - 4h
320 * 0x02 - 6h
321 * ...
322 * 0x07 - 16h
323 * Round down odd values.
324 */
325 switch (hours) {
326 case 4 ... 16:
327 data = (hours - 4) / 2 + 1;
328 break;
329 case 0:
330 /* Disable */
331 data = 0;
332 break;
333 default:
334 return -EINVAL;
335 }
336 data <<= CHG_CNFG_01_FCHGTIME_SHIFT;
337
338 return regmap_update_bits(chg->max77693->regmap,
339 MAX77693_CHG_REG_CHG_CNFG_01,
340 CHG_CNFG_01_FCHGTIME_MASK, data);
341}
342
343static ssize_t fast_charge_timer_store(struct device *dev,
344 struct device_attribute *attr, const char *buf, size_t count)
345{
346 return device_attr_store(dev, attr, buf, count,
347 max77693_set_fast_charge_timer);
348}
349
350static ssize_t top_off_threshold_current_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
353 struct max77693_charger *chg = dev_get_drvdata(dev);
354 unsigned int data, val;
355 int ret;
356
357 ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03,
358 &data);
359 if (ret < 0)
360 return ret;
361
362 data &= CHG_CNFG_03_TOITH_MASK;
363 data >>= CHG_CNFG_03_TOITH_SHIFT;
364
365 if (data <= 0x04)
366 val = 100000 + data * 25000;
367 else
368 val = data * 50000;
369
370 return scnprintf(buf, PAGE_SIZE, "%u\n", val);
371}
372
373static int max77693_set_top_off_threshold_current(struct max77693_charger *chg,
374 unsigned long uamp)
375{
376 unsigned int data;
377
378 if (uamp < 100000 || uamp > 350000)
379 return -EINVAL;
380
381 if (uamp <= 200000)
382 data = (uamp - 100000) / 25000;
383 else
384 /* (200000, 350000> */
385 data = uamp / 50000;
386
387 data <<= CHG_CNFG_03_TOITH_SHIFT;
388
389 return regmap_update_bits(chg->max77693->regmap,
390 MAX77693_CHG_REG_CHG_CNFG_03,
391 CHG_CNFG_03_TOITH_MASK, data);
392}
393
394static ssize_t top_off_threshold_current_store(struct device *dev,
395 struct device_attribute *attr, const char *buf, size_t count)
396{
397 return device_attr_store(dev, attr, buf, count,
398 max77693_set_top_off_threshold_current);
399}
400
401static ssize_t top_off_timer_show(struct device *dev,
402 struct device_attribute *attr, char *buf)
403{
404 struct max77693_charger *chg = dev_get_drvdata(dev);
405 unsigned int data, val;
406 int ret;
407
408 ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03,
409 &data);
410 if (ret < 0)
411 return ret;
412
413 data &= CHG_CNFG_03_TOTIME_MASK;
414 data >>= CHG_CNFG_03_TOTIME_SHIFT;
415
416 val = data * 10;
417
418 return scnprintf(buf, PAGE_SIZE, "%u\n", val);
419}
420
421static int max77693_set_top_off_timer(struct max77693_charger *chg,
422 unsigned long minutes)
423{
424 unsigned int data;
425
426 if (minutes > 70)
427 return -EINVAL;
428
429 data = minutes / 10;
430 data <<= CHG_CNFG_03_TOTIME_SHIFT;
431
432 return regmap_update_bits(chg->max77693->regmap,
433 MAX77693_CHG_REG_CHG_CNFG_03,
434 CHG_CNFG_03_TOTIME_MASK, data);
435}
436
437static ssize_t top_off_timer_store(struct device *dev,
438 struct device_attribute *attr, const char *buf, size_t count)
439{
440 return device_attr_store(dev, attr, buf, count,
441 max77693_set_top_off_timer);
442}
443
444static DEVICE_ATTR_RW(fast_charge_timer);
445static DEVICE_ATTR_RW(top_off_threshold_current);
446static DEVICE_ATTR_RW(top_off_timer);
447
448static int max77693_set_constant_volt(struct max77693_charger *chg,
449 unsigned int uvolt)
450{
451 unsigned int data;
452
453 /*
454 * 0x00 - 3.650 V
455 * 0x01 - 3.675 V
456 * ...
457 * 0x1b - 4.325 V
458 * 0x1c - 4.340 V
459 * 0x1d - 4.350 V
460 * 0x1e - 4.375 V
461 * 0x1f - 4.400 V
462 */
463 if (uvolt >= 3650000 && uvolt < 4340000)
464 data = (uvolt - 3650000) / 25000;
465 else if (uvolt >= 4340000 && uvolt < 4350000)
466 data = 0x1c;
467 else if (uvolt >= 4350000 && uvolt <= 4400000)
468 data = 0x1d + (uvolt - 4350000) / 25000;
469 else {
470 dev_err(chg->dev, "Wrong value for charging constant voltage\n");
471 return -EINVAL;
472 }
473
474 data <<= CHG_CNFG_04_CHGCVPRM_SHIFT;
475
476 dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt,
477 data);
478
479 return regmap_update_bits(chg->max77693->regmap,
480 MAX77693_CHG_REG_CHG_CNFG_04,
481 CHG_CNFG_04_CHGCVPRM_MASK, data);
482}
483
484static int max77693_set_min_system_volt(struct max77693_charger *chg,
485 unsigned int uvolt)
486{
487 unsigned int data;
488
489 if (uvolt < 3000000 || uvolt > 3700000) {
490 dev_err(chg->dev, "Wrong value for minimum system regulation voltage\n");
491 return -EINVAL;
492 }
493
494 data = (uvolt - 3000000) / 100000;
495
496 data <<= CHG_CNFG_04_MINVSYS_SHIFT;
497
498 dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n",
499 uvolt, data);
500
501 return regmap_update_bits(chg->max77693->regmap,
502 MAX77693_CHG_REG_CHG_CNFG_04,
503 CHG_CNFG_04_MINVSYS_MASK, data);
504}
505
506static int max77693_set_thermal_regulation_temp(struct max77693_charger *chg,
507 unsigned int cels)
508{
509 unsigned int data;
510
511 switch (cels) {
512 case 70:
513 case 85:
514 case 100:
515 case 115:
516 data = (cels - 70) / 15;
517 break;
518 default:
519 dev_err(chg->dev, "Wrong value for thermal regulation loop temperature\n");
520 return -EINVAL;
521 }
522
523 data <<= CHG_CNFG_07_REGTEMP_SHIFT;
524
525 dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n",
526 cels, data);
527
528 return regmap_update_bits(chg->max77693->regmap,
529 MAX77693_CHG_REG_CHG_CNFG_07,
530 CHG_CNFG_07_REGTEMP_MASK, data);
531}
532
533static int max77693_set_batttery_overcurrent(struct max77693_charger *chg,
534 unsigned int uamp)
535{
536 unsigned int data;
537
538 if (uamp && (uamp < 2000000 || uamp > 3500000)) {
539 dev_err(chg->dev, "Wrong value for battery overcurrent\n");
540 return -EINVAL;
541 }
542
543 if (uamp)
544 data = ((uamp - 2000000) / 250000) + 1;
545 else
546 data = 0; /* disable */
547
548 data <<= CHG_CNFG_12_B2SOVRC_SHIFT;
549
550 dev_dbg(chg->dev, "Battery overcurrent: %u (0x%x)\n", uamp, data);
551
552 return regmap_update_bits(chg->max77693->regmap,
553 MAX77693_CHG_REG_CHG_CNFG_12,
554 CHG_CNFG_12_B2SOVRC_MASK, data);
555}
556
557static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg,
558 unsigned int uvolt)
559{
560 unsigned int data;
561
562 switch (uvolt) {
563 case 4300000:
564 data = 0x0;
565 break;
566 case 4700000:
567 case 4800000:
568 case 4900000:
569 data = (uvolt - 4700000) / 100000;
570 default:
571 dev_err(chg->dev, "Wrong value for charge input voltage regulation threshold\n");
572 return -EINVAL;
573 }
574
575 data <<= CHG_CNFG_12_VCHGINREG_SHIFT;
576
577 dev_dbg(chg->dev, "Charge input voltage regulation threshold: %u (0x%x)\n",
578 uvolt, data);
579
580 return regmap_update_bits(chg->max77693->regmap,
581 MAX77693_CHG_REG_CHG_CNFG_12,
582 CHG_CNFG_12_VCHGINREG_MASK, data);
583}
584
585/*
586 * Sets charger registers to proper and safe default values.
587 */
588static int max77693_reg_init(struct max77693_charger *chg)
589{
590 int ret;
591 unsigned int data;
592
593 /* Unlock charger register protection */
594 data = (0x3 << CHG_CNFG_06_CHGPROT_SHIFT);
595 ret = regmap_update_bits(chg->max77693->regmap,
596 MAX77693_CHG_REG_CHG_CNFG_06,
597 CHG_CNFG_06_CHGPROT_MASK, data);
598 if (ret) {
599 dev_err(chg->dev, "Error unlocking registers: %d\n", ret);
600 return ret;
601 }
602
603 ret = max77693_set_fast_charge_timer(chg, DEFAULT_FAST_CHARGE_TIMER);
604 if (ret)
605 return ret;
606
607 ret = max77693_set_top_off_threshold_current(chg,
608 DEFAULT_TOP_OFF_THRESHOLD_CURRENT);
609 if (ret)
610 return ret;
611
612 ret = max77693_set_top_off_timer(chg, DEFAULT_TOP_OFF_TIMER);
613 if (ret)
614 return ret;
615
616 ret = max77693_set_constant_volt(chg, chg->constant_volt);
617 if (ret)
618 return ret;
619
620 ret = max77693_set_min_system_volt(chg, chg->min_system_volt);
621 if (ret)
622 return ret;
623
624 ret = max77693_set_thermal_regulation_temp(chg,
625 chg->thermal_regulation_temp);
626 if (ret)
627 return ret;
628
629 ret = max77693_set_batttery_overcurrent(chg, chg->batttery_overcurrent);
630 if (ret)
631 return ret;
632
5b40b3e6 633 return max77693_set_charge_input_threshold_volt(chg,
87c2d906 634 chg->charge_input_threshold_volt);
87c2d906
KK		 635}
636
637#ifdef CONFIG_OF
638static int max77693_dt_init(struct device *dev, struct max77693_charger *chg)
639{
640 struct device_node *np = dev->of_node;
641
642 if (!np) {
643 dev_err(dev, "no charger OF node\n");
644 return -EINVAL;
645 }
646
647 if (of_property_read_u32(np, "maxim,constant-microvolt",
648 &chg->constant_volt))
649 chg->constant_volt = DEFAULT_CONSTANT_VOLT;
650
651 if (of_property_read_u32(np, "maxim,min-system-microvolt",
652 &chg->min_system_volt))
653 chg->min_system_volt = DEFAULT_MIN_SYSTEM_VOLT;
654
655 if (of_property_read_u32(np, "maxim,thermal-regulation-celsius",
656 &chg->thermal_regulation_temp))
657 chg->thermal_regulation_temp = DEFAULT_THERMAL_REGULATION_TEMP;
658
659 if (of_property_read_u32(np, "maxim,battery-overcurrent-microamp",
660 &chg->batttery_overcurrent))
661 chg->batttery_overcurrent = DEFAULT_BATTERY_OVERCURRENT;
662
663 if (of_property_read_u32(np, "maxim,charge-input-threshold-microvolt",
664 &chg->charge_input_threshold_volt))
665 chg->charge_input_threshold_volt =
666 DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT;
667
668 return 0;
669}
670#else /* CONFIG_OF */
671static int max77693_dt_init(struct device *dev, struct max77693_charger *chg)
672{
673 return 0;
674}
675#endif /* CONFIG_OF */
676
677static int max77693_charger_probe(struct platform_device *pdev)
678{
679 struct max77693_charger *chg;
297d716f 680 struct power_supply_config psy_cfg = {};
87c2d906
KK		 681 struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
682 int ret;
683
684 chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
685 if (!chg)
686 return -ENOMEM;
687
688 platform_set_drvdata(pdev, chg);
689 chg->dev = &pdev->dev;
690 chg->max77693 = max77693;
691
692 ret = max77693_dt_init(&pdev->dev, chg);
693 if (ret)
694 return ret;
695
696 ret = max77693_reg_init(chg);
697 if (ret)
698 return ret;
699
297d716f 700 psy_cfg.drv_data = chg;
87c2d906
KK		 701
702 ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
703 if (ret) {
704 dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n");
705 goto err;
706 }
707
708 ret = device_create_file(&pdev->dev,
709 &dev_attr_top_off_threshold_current);
710 if (ret) {
711 dev_err(&pdev->dev, "failed: create top off current sysfs entry\n");
712 goto err;
713 }
714
715 ret = device_create_file(&pdev->dev, &dev_attr_top_off_timer);
716 if (ret) {
717 dev_err(&pdev->dev, "failed: create top off timer sysfs entry\n");
718 goto err;
719 }
720
297d716f
KK		 721 chg->charger = power_supply_register(&pdev->dev,
722 &max77693_charger_desc,
723 &psy_cfg);
724 if (IS_ERR(chg->charger)) {
87c2d906 725 dev_err(&pdev->dev, "failed: power supply register\n");
297d716f 726 ret = PTR_ERR(chg->charger);
87c2d906
KK		 727 goto err;
728 }
729
730 return 0;
731
732err:
733 device_remove_file(&pdev->dev, &dev_attr_top_off_timer);
734 device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current);
735 device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
736
737 return ret;
738}
739
740static int max77693_charger_remove(struct platform_device *pdev)
741{
742 struct max77693_charger *chg = platform_get_drvdata(pdev);
743
744 device_remove_file(&pdev->dev, &dev_attr_top_off_timer);
745 device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current);
746 device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
747
297d716f 748 power_supply_unregister(chg->charger);
87c2d906
KK		 749
750 return 0;
751}
752
753static const struct platform_device_id max77693_charger_id[] = {
754 { "max77693-charger", 0, },
755 { }
756};
757MODULE_DEVICE_TABLE(platform, max77693_charger_id);
758
759static struct platform_driver max77693_charger_driver = {
760 .driver = {
87c2d906
KK		 761 .name = "max77693-charger",
762 },
763 .probe = max77693_charger_probe,
764 .remove = max77693_charger_remove,
765 .id_table = max77693_charger_id,
766};
767module_platform_driver(max77693_charger_driver);
768
769MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
770MODULE_DESCRIPTION("Maxim 77693 charger driver");
771MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)