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11#include <linux/acpi.h>
12#include <linux/devm-helpers.h>
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/i2c.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19#include <linux/pm.h>
20#include <linux/mod_devicetable.h>
21#include <linux/power_supply.h>
22#include <linux/power/max17042_battery.h>
23#include <linux/of.h>
24#include <linux/regmap.h>
25
26
27#define STATUS_POR_BIT (1 << 1)
28#define STATUS_BST_BIT (1 << 3)
29#define STATUS_VMN_BIT (1 << 8)
30#define STATUS_TMN_BIT (1 << 9)
31#define STATUS_SMN_BIT (1 << 10)
32#define STATUS_BI_BIT (1 << 11)
33#define STATUS_VMX_BIT (1 << 12)
34#define STATUS_TMX_BIT (1 << 13)
35#define STATUS_SMX_BIT (1 << 14)
36#define STATUS_BR_BIT (1 << 15)
37
38
39#define CONFIG_ALRT_BIT_ENBL (1 << 2)
40
41#define VFSOC0_LOCK 0x0000
42#define VFSOC0_UNLOCK 0x0080
43#define MODEL_UNLOCK1 0X0059
44#define MODEL_UNLOCK2 0X00C4
45#define MODEL_LOCK1 0X0000
46#define MODEL_LOCK2 0X0000
47
48#define dQ_ACC_DIV 0x4
49#define dP_ACC_100 0x1900
50#define dP_ACC_200 0x3200
51
52#define MAX17042_VMAX_TOLERANCE 50
53
54struct max17042_chip {
55 struct i2c_client *client;
56 struct regmap *regmap;
57 struct power_supply *battery;
58 enum max170xx_chip_type chip_type;
59 struct max17042_platform_data *pdata;
60 struct work_struct work;
61 int init_complete;
62};
63
64static enum power_supply_property max17042_battery_props[] = {
65 POWER_SUPPLY_PROP_STATUS,
66 POWER_SUPPLY_PROP_PRESENT,
67 POWER_SUPPLY_PROP_TECHNOLOGY,
68 POWER_SUPPLY_PROP_CYCLE_COUNT,
69 POWER_SUPPLY_PROP_VOLTAGE_MAX,
70 POWER_SUPPLY_PROP_VOLTAGE_MIN,
71 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
72 POWER_SUPPLY_PROP_VOLTAGE_NOW,
73 POWER_SUPPLY_PROP_VOLTAGE_AVG,
74 POWER_SUPPLY_PROP_VOLTAGE_OCV,
75 POWER_SUPPLY_PROP_CAPACITY,
76 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
77 POWER_SUPPLY_PROP_CHARGE_FULL,
78 POWER_SUPPLY_PROP_CHARGE_NOW,
79 POWER_SUPPLY_PROP_CHARGE_COUNTER,
80 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
81 POWER_SUPPLY_PROP_TEMP,
82 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
83 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
84 POWER_SUPPLY_PROP_TEMP_MIN,
85 POWER_SUPPLY_PROP_TEMP_MAX,
86 POWER_SUPPLY_PROP_HEALTH,
87 POWER_SUPPLY_PROP_SCOPE,
88 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
89
90 POWER_SUPPLY_PROP_CURRENT_NOW,
91 POWER_SUPPLY_PROP_CURRENT_AVG,
92};
93
94static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
95{
96 int ret;
97 u32 data;
98 struct regmap *map = chip->regmap;
99
100 ret = regmap_read(map, MAX17042_TEMP, &data);
101 if (ret < 0)
102 return ret;
103
104 *temp = sign_extend32(data, 15);
105
106
107 *temp = *temp * 10 / 256;
108 return 0;
109}
110
111static int max17042_get_status(struct max17042_chip *chip, int *status)
112{
113 int ret, charge_full, charge_now;
114 int avg_current;
115 u32 data;
116
117 ret = power_supply_am_i_supplied(chip->battery);
118 if (ret < 0) {
119 *status = POWER_SUPPLY_STATUS_UNKNOWN;
120 return 0;
121 }
122 if (ret == 0) {
123 *status = POWER_SUPPLY_STATUS_DISCHARGING;
124 return 0;
125 }
126
127
128
129
130
131
132
133
134
135
136
137 ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
138 if (ret < 0)
139 return ret;
140
141 ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
142 if (ret < 0)
143 return ret;
144
145 if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) {
146 *status = POWER_SUPPLY_STATUS_FULL;
147 return 0;
148 }
149
150
151
152
153
154 if (!chip->pdata->enable_current_sense) {
155 *status = POWER_SUPPLY_STATUS_CHARGING;
156 return 0;
157 }
158
159 ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data);
160 if (ret < 0)
161 return ret;
162
163 avg_current = sign_extend32(data, 15);
164 avg_current *= 1562500 / chip->pdata->r_sns;
165
166 if (avg_current > 0)
167 *status = POWER_SUPPLY_STATUS_CHARGING;
168 else
169 *status = POWER_SUPPLY_STATUS_DISCHARGING;
170
171 return 0;
172}
173
174static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
175{
176 int temp, vavg, vbatt, ret;
177 u32 val;
178
179 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
180 if (ret < 0)
181 goto health_error;
182
183
184 vavg = val * 625 / 8;
185
186 vavg /= 1000;
187
188 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
189 if (ret < 0)
190 goto health_error;
191
192
193 vbatt = val * 625 / 8;
194
195 vbatt /= 1000;
196
197 if (vavg < chip->pdata->vmin) {
198 *health = POWER_SUPPLY_HEALTH_DEAD;
199 goto out;
200 }
201
202 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
203 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
204 goto out;
205 }
206
207 ret = max17042_get_temperature(chip, &temp);
208 if (ret < 0)
209 goto health_error;
210
211 if (temp < chip->pdata->temp_min) {
212 *health = POWER_SUPPLY_HEALTH_COLD;
213 goto out;
214 }
215
216 if (temp > chip->pdata->temp_max) {
217 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
218 goto out;
219 }
220
221 *health = POWER_SUPPLY_HEALTH_GOOD;
222
223out:
224 return 0;
225
226health_error:
227 return ret;
228}
229
230static int max17042_get_property(struct power_supply *psy,
231 enum power_supply_property psp,
232 union power_supply_propval *val)
233{
234 struct max17042_chip *chip = power_supply_get_drvdata(psy);
235 struct regmap *map = chip->regmap;
236 int ret;
237 u32 data;
238 u64 data64;
239
240 if (!chip->init_complete)
241 return -EAGAIN;
242
243 switch (psp) {
244 case POWER_SUPPLY_PROP_STATUS:
245 ret = max17042_get_status(chip, &val->intval);
246 if (ret < 0)
247 return ret;
248 break;
249 case POWER_SUPPLY_PROP_PRESENT:
250 ret = regmap_read(map, MAX17042_STATUS, &data);
251 if (ret < 0)
252 return ret;
253
254 if (data & MAX17042_STATUS_BattAbsent)
255 val->intval = 0;
256 else
257 val->intval = 1;
258 break;
259 case POWER_SUPPLY_PROP_TECHNOLOGY:
260 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
261 break;
262 case POWER_SUPPLY_PROP_CYCLE_COUNT:
263 ret = regmap_read(map, MAX17042_Cycles, &data);
264 if (ret < 0)
265 return ret;
266
267 val->intval = data;
268 break;
269 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
270 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
271 if (ret < 0)
272 return ret;
273
274 val->intval = data >> 8;
275 val->intval *= 20000;
276 break;
277 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
278 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
279 if (ret < 0)
280 return ret;
281
282 val->intval = (data & 0xff) * 20000;
283 break;
284 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
285 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
286 ret = regmap_read(map, MAX17042_V_empty, &data);
287 else
288 ret = regmap_read(map, MAX17047_V_empty, &data);
289 if (ret < 0)
290 return ret;
291
292 val->intval = data >> 7;
293 val->intval *= 10000;
294 break;
295 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
296 ret = regmap_read(map, MAX17042_VCELL, &data);
297 if (ret < 0)
298 return ret;
299
300 val->intval = data * 625 / 8;
301 break;
302 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
303 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
304 if (ret < 0)
305 return ret;
306
307 val->intval = data * 625 / 8;
308 break;
309 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
310 ret = regmap_read(map, MAX17042_OCVInternal, &data);
311 if (ret < 0)
312 return ret;
313
314 val->intval = data * 625 / 8;
315 break;
316 case POWER_SUPPLY_PROP_CAPACITY:
317 if (chip->pdata->enable_current_sense)
318 ret = regmap_read(map, MAX17042_RepSOC, &data);
319 else
320 ret = regmap_read(map, MAX17042_VFSOC, &data);
321 if (ret < 0)
322 return ret;
323
324 val->intval = data >> 8;
325 break;
326 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
327 ret = regmap_read(map, MAX17042_DesignCap, &data);
328 if (ret < 0)
329 return ret;
330
331 data64 = data * 5000000ll;
332 do_div(data64, chip->pdata->r_sns);
333 val->intval = data64;
334 break;
335 case POWER_SUPPLY_PROP_CHARGE_FULL:
336 ret = regmap_read(map, MAX17042_FullCAP, &data);
337 if (ret < 0)
338 return ret;
339
340 data64 = data * 5000000ll;
341 do_div(data64, chip->pdata->r_sns);
342 val->intval = data64;
343 break;
344 case POWER_SUPPLY_PROP_CHARGE_NOW:
345 ret = regmap_read(map, MAX17042_RepCap, &data);
346 if (ret < 0)
347 return ret;
348
349 data64 = data * 5000000ll;
350 do_div(data64, chip->pdata->r_sns);
351 val->intval = data64;
352 break;
353 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
354 ret = regmap_read(map, MAX17042_QH, &data);
355 if (ret < 0)
356 return ret;
357
358 data64 = sign_extend64(data, 15) * 5000000ll;
359 val->intval = div_s64(data64, chip->pdata->r_sns);
360 break;
361 case POWER_SUPPLY_PROP_TEMP:
362 ret = max17042_get_temperature(chip, &val->intval);
363 if (ret < 0)
364 return ret;
365 break;
366 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
367 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
368 if (ret < 0)
369 return ret;
370
371 val->intval = sign_extend32(data & 0xff, 7) * 10;
372 break;
373 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
374 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
375 if (ret < 0)
376 return ret;
377
378 val->intval = sign_extend32(data >> 8, 7) * 10;
379 break;
380 case POWER_SUPPLY_PROP_TEMP_MIN:
381 val->intval = chip->pdata->temp_min;
382 break;
383 case POWER_SUPPLY_PROP_TEMP_MAX:
384 val->intval = chip->pdata->temp_max;
385 break;
386 case POWER_SUPPLY_PROP_HEALTH:
387 ret = max17042_get_battery_health(chip, &val->intval);
388 if (ret < 0)
389 return ret;
390 break;
391 case POWER_SUPPLY_PROP_SCOPE:
392 val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
393 break;
394 case POWER_SUPPLY_PROP_CURRENT_NOW:
395 if (chip->pdata->enable_current_sense) {
396 ret = regmap_read(map, MAX17042_Current, &data);
397 if (ret < 0)
398 return ret;
399
400 data64 = sign_extend64(data, 15) * 1562500ll;
401 val->intval = div_s64(data64, chip->pdata->r_sns);
402 } else {
403 return -EINVAL;
404 }
405 break;
406 case POWER_SUPPLY_PROP_CURRENT_AVG:
407 if (chip->pdata->enable_current_sense) {
408 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
409 if (ret < 0)
410 return ret;
411
412 data64 = sign_extend64(data, 15) * 1562500ll;
413 val->intval = div_s64(data64, chip->pdata->r_sns);
414 } else {
415 return -EINVAL;
416 }
417 break;
418 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
419 ret = regmap_read(map, MAX17042_ICHGTerm, &data);
420 if (ret < 0)
421 return ret;
422
423 data64 = data * 1562500ll;
424 val->intval = div_s64(data64, chip->pdata->r_sns);
425 break;
426 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
427 ret = regmap_read(map, MAX17042_TTE, &data);
428 if (ret < 0)
429 return ret;
430
431 val->intval = data * 5625 / 1000;
432 break;
433 default:
434 return -EINVAL;
435 }
436 return 0;
437}
438
439static int max17042_set_property(struct power_supply *psy,
440 enum power_supply_property psp,
441 const union power_supply_propval *val)
442{
443 struct max17042_chip *chip = power_supply_get_drvdata(psy);
444 struct regmap *map = chip->regmap;
445 int ret = 0;
446 u32 data;
447 int8_t temp;
448
449 switch (psp) {
450 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
451 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
452 if (ret < 0)
453 return ret;
454
455
456 temp = val->intval / 10;
457
458 if (temp >= (int8_t)(data >> 8))
459 temp = (int8_t)(data >> 8) - 1;
460
461 data = (data & 0xff00) + temp;
462 ret = regmap_write(map, MAX17042_TALRT_Th, data);
463 break;
464 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
465 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
466 if (ret < 0)
467 return ret;
468
469
470 temp = val->intval / 10;
471
472 if (temp <= (int8_t)(data & 0xff))
473 temp = (int8_t)(data & 0xff) + 1;
474
475 data = (data & 0xff) + (temp << 8);
476 ret = regmap_write(map, MAX17042_TALRT_Th, data);
477 break;
478 default:
479 ret = -EINVAL;
480 }
481
482 return ret;
483}
484
485static int max17042_property_is_writeable(struct power_supply *psy,
486 enum power_supply_property psp)
487{
488 int ret;
489
490 switch (psp) {
491 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
492 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
493 ret = 1;
494 break;
495 default:
496 ret = 0;
497 }
498
499 return ret;
500}
501
502static void max17042_external_power_changed(struct power_supply *psy)
503{
504 power_supply_changed(psy);
505}
506
507static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
508{
509 int retries = 8;
510 int ret;
511 u32 read_value;
512
513 do {
514 ret = regmap_write(map, reg, value);
515 regmap_read(map, reg, &read_value);
516 if (read_value != value) {
517 ret = -EIO;
518 retries--;
519 }
520 } while (retries && read_value != value);
521
522 if (ret < 0)
523 pr_err("%s: err %d\n", __func__, ret);
524
525 return ret;
526}
527
528static inline void max17042_override_por(struct regmap *map,
529 u8 reg, u16 value)
530{
531 if (value)
532 regmap_write(map, reg, value);
533}
534
535static inline void max17042_unlock_model(struct max17042_chip *chip)
536{
537 struct regmap *map = chip->regmap;
538
539 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
540 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
541}
542
543static inline void max17042_lock_model(struct max17042_chip *chip)
544{
545 struct regmap *map = chip->regmap;
546
547 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
548 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
549}
550
551static inline void max17042_write_model_data(struct max17042_chip *chip,
552 u8 addr, int size)
553{
554 struct regmap *map = chip->regmap;
555 int i;
556
557 for (i = 0; i < size; i++)
558 regmap_write(map, addr + i,
559 chip->pdata->config_data->cell_char_tbl[i]);
560}
561
562static inline void max17042_read_model_data(struct max17042_chip *chip,
563 u8 addr, u16 *data, int size)
564{
565 struct regmap *map = chip->regmap;
566 int i;
567 u32 tmp;
568
569 for (i = 0; i < size; i++) {
570 regmap_read(map, addr + i, &tmp);
571 data[i] = (u16)tmp;
572 }
573}
574
575static inline int max17042_model_data_compare(struct max17042_chip *chip,
576 u16 *data1, u16 *data2, int size)
577{
578 int i;
579
580 if (memcmp(data1, data2, size)) {
581 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
582 for (i = 0; i < size; i++)
583 dev_info(&chip->client->dev, "0x%x, 0x%x",
584 data1[i], data2[i]);
585 dev_info(&chip->client->dev, "\n");
586 return -EINVAL;
587 }
588 return 0;
589}
590
591static int max17042_init_model(struct max17042_chip *chip)
592{
593 int ret;
594 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
595 u16 *temp_data;
596
597 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
598 if (!temp_data)
599 return -ENOMEM;
600
601 max17042_unlock_model(chip);
602 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
603 table_size);
604 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
605 table_size);
606
607 ret = max17042_model_data_compare(
608 chip,
609 chip->pdata->config_data->cell_char_tbl,
610 temp_data,
611 table_size);
612
613 max17042_lock_model(chip);
614 kfree(temp_data);
615
616 return ret;
617}
618
619static int max17042_verify_model_lock(struct max17042_chip *chip)
620{
621 int i;
622 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
623 u16 *temp_data;
624 int ret = 0;
625
626 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
627 if (!temp_data)
628 return -ENOMEM;
629
630 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
631 table_size);
632 for (i = 0; i < table_size; i++)
633 if (temp_data[i])
634 ret = -EINVAL;
635
636 kfree(temp_data);
637 return ret;
638}
639
640static void max17042_write_config_regs(struct max17042_chip *chip)
641{
642 struct max17042_config_data *config = chip->pdata->config_data;
643 struct regmap *map = chip->regmap;
644
645 regmap_write(map, MAX17042_CONFIG, config->config);
646 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
647 regmap_write(map, MAX17042_FilterCFG,
648 config->filter_cfg);
649 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
650 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
651 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050 ||
652 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)
653 regmap_write(map, MAX17047_FullSOCThr,
654 config->full_soc_thresh);
655}
656
657static void max17042_write_custom_regs(struct max17042_chip *chip)
658{
659 struct max17042_config_data *config = chip->pdata->config_data;
660 struct regmap *map = chip->regmap;
661
662 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
663 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
664 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
665 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
666 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
667 max17042_write_verify_reg(map, MAX17042_K_empty0,
668 config->kempty0);
669 } else {
670 max17042_write_verify_reg(map, MAX17047_QRTbl00,
671 config->qrtbl00);
672 max17042_write_verify_reg(map, MAX17047_QRTbl10,
673 config->qrtbl10);
674 max17042_write_verify_reg(map, MAX17047_QRTbl20,
675 config->qrtbl20);
676 max17042_write_verify_reg(map, MAX17047_QRTbl30,
677 config->qrtbl30);
678 }
679}
680
681static void max17042_update_capacity_regs(struct max17042_chip *chip)
682{
683 struct max17042_config_data *config = chip->pdata->config_data;
684 struct regmap *map = chip->regmap;
685
686 max17042_write_verify_reg(map, MAX17042_FullCAP,
687 config->fullcap);
688 regmap_write(map, MAX17042_DesignCap, config->design_cap);
689 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
690 config->fullcapnom);
691}
692
693static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
694{
695 unsigned int vfSoc;
696 struct regmap *map = chip->regmap;
697
698 regmap_read(map, MAX17042_VFSOC, &vfSoc);
699 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
700 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
701 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
702}
703
704static void max17042_load_new_capacity_params(struct max17042_chip *chip)
705{
706 u32 full_cap0, rep_cap, dq_acc, vfSoc;
707 u32 rem_cap;
708
709 struct max17042_config_data *config = chip->pdata->config_data;
710 struct regmap *map = chip->regmap;
711
712 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
713 regmap_read(map, MAX17042_VFSOC, &vfSoc);
714
715
716
717
718
719 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
720 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
721
722 rep_cap = rem_cap;
723 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
724
725
726 dq_acc = config->fullcap / dQ_ACC_DIV;
727 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
728 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
729
730 max17042_write_verify_reg(map, MAX17042_FullCAP,
731 config->fullcap);
732 regmap_write(map, MAX17042_DesignCap,
733 config->design_cap);
734 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
735 config->fullcapnom);
736
737 regmap_write(map, MAX17042_RepSOC, vfSoc);
738}
739
740
741
742
743
744
745static inline void max17042_override_por_values(struct max17042_chip *chip)
746{
747 struct regmap *map = chip->regmap;
748 struct max17042_config_data *config = chip->pdata->config_data;
749
750 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
751 max17042_override_por(map, MAX17042_TOFF, config->toff);
752 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
753 max17042_override_por(map, MAX17042_COFF, config->coff);
754
755 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
756 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
757 max17042_override_por(map, MAX17042_SALRT_Th,
758 config->soc_alrt_thresh);
759 max17042_override_por(map, MAX17042_CONFIG, config->config);
760 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
761
762 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
763 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
764
765 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
766 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
767 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
768 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
769 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
770
771 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
772 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
773 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
774 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
775
776 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
777 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
778
779 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
780 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
781 max17042_override_por(map, MAX17042_SOC_empty, config->socempty);
782 max17042_override_por(map, MAX17042_V_empty, config->vempty);
783 max17042_override_por(map, MAX17042_EmptyTempCo, config->empty_tempco);
784 max17042_override_por(map, MAX17042_K_empty0, config->kempty0);
785 }
786
787 if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) ||
788 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
789 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) {
790 max17042_override_por(map, MAX17042_IAvg_empty, config->iavg_empty);
791 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
792 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
793 max17042_override_por(map, MAX17042_FCTC, config->fctc);
794 }
795
796 if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
797 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050) ||
798 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)) {
799 max17042_override_por(map, MAX17047_V_empty, config->vempty);
800 }
801}
802
803static int max17042_init_chip(struct max17042_chip *chip)
804{
805 struct regmap *map = chip->regmap;
806 int ret;
807
808 max17042_override_por_values(chip);
809
810
811
812 msleep(500);
813
814
815 max17042_write_config_regs(chip);
816
817
818 ret = max17042_init_model(chip);
819 if (ret) {
820 dev_err(&chip->client->dev, "%s init failed\n",
821 __func__);
822 return -EIO;
823 }
824
825 ret = max17042_verify_model_lock(chip);
826 if (ret) {
827 dev_err(&chip->client->dev, "%s lock verify failed\n",
828 __func__);
829 return -EIO;
830 }
831
832 max17042_write_custom_regs(chip);
833
834
835 max17042_update_capacity_regs(chip);
836
837
838
839
840 msleep(350);
841
842
843 max17042_reset_vfsoc0_reg(chip);
844
845
846 max17042_load_new_capacity_params(chip);
847
848
849 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
850 return 0;
851}
852
853static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
854{
855 struct regmap *map = chip->regmap;
856 u32 soc, soc_tr;
857
858
859
860
861 regmap_read(map, MAX17042_RepSOC, &soc);
862 soc >>= 8;
863 soc_tr = (soc + off) << 8;
864 if (off < soc)
865 soc_tr |= soc - off;
866 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
867}
868
869static irqreturn_t max17042_thread_handler(int id, void *dev)
870{
871 struct max17042_chip *chip = dev;
872 u32 val;
873 int ret;
874
875 ret = regmap_read(chip->regmap, MAX17042_STATUS, &val);
876 if (ret)
877 return IRQ_HANDLED;
878
879 if ((val & STATUS_SMN_BIT) || (val & STATUS_SMX_BIT)) {
880 dev_dbg(&chip->client->dev, "SOC threshold INTR\n");
881 max17042_set_soc_threshold(chip, 1);
882 }
883
884
885 regmap_clear_bits(chip->regmap, MAX17042_STATUS,
886 0xFFFF & ~(STATUS_POR_BIT | STATUS_BST_BIT));
887
888 power_supply_changed(chip->battery);
889 return IRQ_HANDLED;
890}
891
892static void max17042_init_worker(struct work_struct *work)
893{
894 struct max17042_chip *chip = container_of(work,
895 struct max17042_chip, work);
896 int ret;
897
898
899 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
900 ret = max17042_init_chip(chip);
901 if (ret)
902 return;
903 }
904
905 chip->init_complete = 1;
906}
907
908#ifdef CONFIG_OF
909static struct max17042_platform_data *
910max17042_get_of_pdata(struct max17042_chip *chip)
911{
912 struct device *dev = &chip->client->dev;
913 struct device_node *np = dev->of_node;
914 u32 prop;
915 struct max17042_platform_data *pdata;
916
917 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
918 if (!pdata)
919 return NULL;
920
921
922
923
924
925 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
926 pdata->r_sns = prop;
927 pdata->enable_current_sense = true;
928 }
929
930 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
931 pdata->temp_min = INT_MIN;
932 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
933 pdata->temp_max = INT_MAX;
934 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
935 pdata->vmin = INT_MIN;
936 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
937 pdata->vmax = INT_MAX;
938
939 return pdata;
940}
941#endif
942
943static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
944
945
946
947
948 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
949};
950
951static struct max17042_platform_data *
952max17042_get_default_pdata(struct max17042_chip *chip)
953{
954 struct device *dev = &chip->client->dev;
955 struct max17042_platform_data *pdata;
956 int ret, misc_cfg;
957
958
959
960
961
962
963 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
964 if (!pdata)
965 return pdata;
966
967 if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
968 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) {
969 pdata->init_data = max17047_default_pdata_init_regs;
970 pdata->num_init_data =
971 ARRAY_SIZE(max17047_default_pdata_init_regs);
972 }
973
974 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
975 if (ret < 0)
976 return NULL;
977
978
979 if ((misc_cfg & 0x3) == 0x3)
980 pdata->enable_current_sense = false;
981 else
982 pdata->enable_current_sense = true;
983
984 pdata->vmin = MAX17042_DEFAULT_VMIN;
985 pdata->vmax = MAX17042_DEFAULT_VMAX;
986 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
987 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
988
989 return pdata;
990}
991
992static struct max17042_platform_data *
993max17042_get_pdata(struct max17042_chip *chip)
994{
995 struct device *dev = &chip->client->dev;
996
997#ifdef CONFIG_OF
998 if (dev->of_node)
999 return max17042_get_of_pdata(chip);
1000#endif
1001 if (dev->platform_data)
1002 return dev->platform_data;
1003
1004 return max17042_get_default_pdata(chip);
1005}
1006
1007static const struct regmap_config max17042_regmap_config = {
1008 .reg_bits = 8,
1009 .val_bits = 16,
1010 .val_format_endian = REGMAP_ENDIAN_NATIVE,
1011};
1012
1013static const struct power_supply_desc max17042_psy_desc = {
1014 .name = "max170xx_battery",
1015 .type = POWER_SUPPLY_TYPE_BATTERY,
1016 .get_property = max17042_get_property,
1017 .set_property = max17042_set_property,
1018 .property_is_writeable = max17042_property_is_writeable,
1019 .external_power_changed = max17042_external_power_changed,
1020 .properties = max17042_battery_props,
1021 .num_properties = ARRAY_SIZE(max17042_battery_props),
1022};
1023
1024static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
1025 .name = "max170xx_battery",
1026 .type = POWER_SUPPLY_TYPE_BATTERY,
1027 .get_property = max17042_get_property,
1028 .set_property = max17042_set_property,
1029 .property_is_writeable = max17042_property_is_writeable,
1030 .properties = max17042_battery_props,
1031 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
1032};
1033
1034static int max17042_probe(struct i2c_client *client,
1035 const struct i2c_device_id *id)
1036{
1037 struct i2c_adapter *adapter = client->adapter;
1038 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
1039 struct power_supply_config psy_cfg = {};
1040 const struct acpi_device_id *acpi_id = NULL;
1041 struct device *dev = &client->dev;
1042 struct max17042_chip *chip;
1043 int ret;
1044 int i;
1045 u32 val;
1046
1047 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
1048 return -EIO;
1049
1050 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1051 if (!chip)
1052 return -ENOMEM;
1053
1054 chip->client = client;
1055 if (id) {
1056 chip->chip_type = id->driver_data;
1057 } else {
1058 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
1059 if (!acpi_id)
1060 return -ENODEV;
1061
1062 chip->chip_type = acpi_id->driver_data;
1063 }
1064 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
1065 if (IS_ERR(chip->regmap)) {
1066 dev_err(&client->dev, "Failed to initialize regmap\n");
1067 return -EINVAL;
1068 }
1069
1070 chip->pdata = max17042_get_pdata(chip);
1071 if (!chip->pdata) {
1072 dev_err(&client->dev, "no platform data provided\n");
1073 return -EINVAL;
1074 }
1075
1076 i2c_set_clientdata(client, chip);
1077 psy_cfg.drv_data = chip;
1078 psy_cfg.of_node = dev->of_node;
1079
1080
1081
1082 if (!chip->pdata->enable_current_sense)
1083 max17042_desc = &max17042_no_current_sense_psy_desc;
1084
1085 if (chip->pdata->r_sns == 0)
1086 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1087
1088 if (chip->pdata->init_data)
1089 for (i = 0; i < chip->pdata->num_init_data; i++)
1090 regmap_write(chip->regmap,
1091 chip->pdata->init_data[i].addr,
1092 chip->pdata->init_data[i].data);
1093
1094 if (!chip->pdata->enable_current_sense) {
1095 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1096 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1097 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1098 }
1099
1100 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1101 &psy_cfg);
1102 if (IS_ERR(chip->battery)) {
1103 dev_err(&client->dev, "failed: power supply register\n");
1104 return PTR_ERR(chip->battery);
1105 }
1106
1107 if (client->irq) {
1108 unsigned int flags = IRQF_ONESHOT;
1109
1110
1111
1112
1113
1114 if (acpi_id)
1115 flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
1116
1117 ret = devm_request_threaded_irq(&client->dev, client->irq,
1118 NULL,
1119 max17042_thread_handler, flags,
1120 chip->battery->desc->name,
1121 chip);
1122 if (!ret) {
1123 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1124 CONFIG_ALRT_BIT_ENBL,
1125 CONFIG_ALRT_BIT_ENBL);
1126 max17042_set_soc_threshold(chip, 1);
1127 } else {
1128 client->irq = 0;
1129 if (ret != -EBUSY)
1130 dev_err(&client->dev, "Failed to get IRQ\n");
1131 }
1132 }
1133
1134 if (!client->irq)
1135 regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
1136
1137 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1138 if (val & STATUS_POR_BIT) {
1139 ret = devm_work_autocancel(&client->dev, &chip->work,
1140 max17042_init_worker);
1141 if (ret)
1142 return ret;
1143 schedule_work(&chip->work);
1144 } else {
1145 chip->init_complete = 1;
1146 }
1147
1148 return 0;
1149}
1150
1151#ifdef CONFIG_PM_SLEEP
1152static int max17042_suspend(struct device *dev)
1153{
1154 struct max17042_chip *chip = dev_get_drvdata(dev);
1155
1156
1157
1158
1159
1160 if (chip->client->irq) {
1161 disable_irq(chip->client->irq);
1162 enable_irq_wake(chip->client->irq);
1163 }
1164
1165 return 0;
1166}
1167
1168static int max17042_resume(struct device *dev)
1169{
1170 struct max17042_chip *chip = dev_get_drvdata(dev);
1171
1172 if (chip->client->irq) {
1173 disable_irq_wake(chip->client->irq);
1174 enable_irq(chip->client->irq);
1175
1176 max17042_set_soc_threshold(chip, 1);
1177 }
1178
1179 return 0;
1180}
1181#endif
1182
1183static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1184 max17042_resume);
1185
1186#ifdef CONFIG_ACPI
1187static const struct acpi_device_id max17042_acpi_match[] = {
1188 { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
1189 { }
1190};
1191MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
1192#endif
1193
1194#ifdef CONFIG_OF
1195static const struct of_device_id max17042_dt_match[] = {
1196 { .compatible = "maxim,max17042" },
1197 { .compatible = "maxim,max17047" },
1198 { .compatible = "maxim,max17050" },
1199 { .compatible = "maxim,max17055" },
1200 { .compatible = "maxim,max77849-battery" },
1201 { },
1202};
1203MODULE_DEVICE_TABLE(of, max17042_dt_match);
1204#endif
1205
1206static const struct i2c_device_id max17042_id[] = {
1207 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1208 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1209 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1210 { "max17055", MAXIM_DEVICE_TYPE_MAX17055 },
1211 { "max77849-battery", MAXIM_DEVICE_TYPE_MAX17047 },
1212 { }
1213};
1214MODULE_DEVICE_TABLE(i2c, max17042_id);
1215
1216static struct i2c_driver max17042_i2c_driver = {
1217 .driver = {
1218 .name = "max17042",
1219 .acpi_match_table = ACPI_PTR(max17042_acpi_match),
1220 .of_match_table = of_match_ptr(max17042_dt_match),
1221 .pm = &max17042_pm_ops,
1222 },
1223 .probe = max17042_probe,
1224 .id_table = max17042_id,
1225};
1226module_i2c_driver(max17042_i2c_driver);
1227
1228MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1229MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1230MODULE_LICENSE("GPL");
1231
