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25#include <linux/acpi.h>
26#include <linux/init.h>
27#include <linux/module.h>
28#include <linux/slab.h>
29#include <linux/i2c.h>
30#include <linux/delay.h>
31#include <linux/interrupt.h>
32#include <linux/pm.h>
33#include <linux/mod_devicetable.h>
34#include <linux/power_supply.h>
35#include <linux/power/max17042_battery.h>
36#include <linux/of.h>
37#include <linux/regmap.h>
38
39
40#define STATUS_POR_BIT (1 << 1)
41#define STATUS_BST_BIT (1 << 3)
42#define STATUS_VMN_BIT (1 << 8)
43#define STATUS_TMN_BIT (1 << 9)
44#define STATUS_SMN_BIT (1 << 10)
45#define STATUS_BI_BIT (1 << 11)
46#define STATUS_VMX_BIT (1 << 12)
47#define STATUS_TMX_BIT (1 << 13)
48#define STATUS_SMX_BIT (1 << 14)
49#define STATUS_BR_BIT (1 << 15)
50
51
52#define CONFIG_ALRT_BIT_ENBL (1 << 2)
53#define STATUS_INTR_SOCMIN_BIT (1 << 10)
54#define STATUS_INTR_SOCMAX_BIT (1 << 14)
55
56#define VFSOC0_LOCK 0x0000
57#define VFSOC0_UNLOCK 0x0080
58#define MODEL_UNLOCK1 0X0059
59#define MODEL_UNLOCK2 0X00C4
60#define MODEL_LOCK1 0X0000
61#define MODEL_LOCK2 0X0000
62
63#define dQ_ACC_DIV 0x4
64#define dP_ACC_100 0x1900
65#define dP_ACC_200 0x3200
66
67#define MAX17042_VMAX_TOLERANCE 50
68
69struct max17042_chip {
70 struct i2c_client *client;
71 struct regmap *regmap;
72 struct power_supply *battery;
73 enum max170xx_chip_type chip_type;
74 struct max17042_platform_data *pdata;
75 struct work_struct work;
76 int init_complete;
77};
78
79static enum power_supply_property max17042_battery_props[] = {
80 POWER_SUPPLY_PROP_STATUS,
81 POWER_SUPPLY_PROP_PRESENT,
82 POWER_SUPPLY_PROP_TECHNOLOGY,
83 POWER_SUPPLY_PROP_CYCLE_COUNT,
84 POWER_SUPPLY_PROP_VOLTAGE_MAX,
85 POWER_SUPPLY_PROP_VOLTAGE_MIN,
86 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
87 POWER_SUPPLY_PROP_VOLTAGE_NOW,
88 POWER_SUPPLY_PROP_VOLTAGE_AVG,
89 POWER_SUPPLY_PROP_VOLTAGE_OCV,
90 POWER_SUPPLY_PROP_CAPACITY,
91 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
92 POWER_SUPPLY_PROP_CHARGE_FULL,
93 POWER_SUPPLY_PROP_CHARGE_NOW,
94 POWER_SUPPLY_PROP_CHARGE_COUNTER,
95 POWER_SUPPLY_PROP_TEMP,
96 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
97 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
98 POWER_SUPPLY_PROP_TEMP_MIN,
99 POWER_SUPPLY_PROP_TEMP_MAX,
100 POWER_SUPPLY_PROP_HEALTH,
101 POWER_SUPPLY_PROP_SCOPE,
102 POWER_SUPPLY_PROP_CURRENT_NOW,
103 POWER_SUPPLY_PROP_CURRENT_AVG,
104};
105
106static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
107{
108 int ret;
109 u32 data;
110 struct regmap *map = chip->regmap;
111
112 ret = regmap_read(map, MAX17042_TEMP, &data);
113 if (ret < 0)
114 return ret;
115
116 *temp = sign_extend32(data, 15);
117
118
119 *temp = *temp * 10 / 256;
120 return 0;
121}
122
123static int max17042_get_status(struct max17042_chip *chip, int *status)
124{
125 int ret, charge_full, charge_now;
126
127 ret = power_supply_am_i_supplied(chip->battery);
128 if (ret < 0) {
129 *status = POWER_SUPPLY_STATUS_UNKNOWN;
130 return 0;
131 }
132 if (ret == 0) {
133 *status = POWER_SUPPLY_STATUS_DISCHARGING;
134 return 0;
135 }
136
137
138
139
140
141
142
143
144
145
146
147 ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
148 if (ret < 0)
149 return ret;
150
151 ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
152 if (ret < 0)
153 return ret;
154
155 if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD)
156 *status = POWER_SUPPLY_STATUS_FULL;
157 else
158 *status = POWER_SUPPLY_STATUS_CHARGING;
159
160 return 0;
161}
162
163static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
164{
165 int temp, vavg, vbatt, ret;
166 u32 val;
167
168 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
169 if (ret < 0)
170 goto health_error;
171
172
173 vavg = val * 625 / 8;
174
175 vavg /= 1000;
176
177 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
178 if (ret < 0)
179 goto health_error;
180
181
182 vbatt = val * 625 / 8;
183
184 vbatt /= 1000;
185
186 if (vavg < chip->pdata->vmin) {
187 *health = POWER_SUPPLY_HEALTH_DEAD;
188 goto out;
189 }
190
191 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
192 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
193 goto out;
194 }
195
196 ret = max17042_get_temperature(chip, &temp);
197 if (ret < 0)
198 goto health_error;
199
200 if (temp < chip->pdata->temp_min) {
201 *health = POWER_SUPPLY_HEALTH_COLD;
202 goto out;
203 }
204
205 if (temp > chip->pdata->temp_max) {
206 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
207 goto out;
208 }
209
210 *health = POWER_SUPPLY_HEALTH_GOOD;
211
212out:
213 return 0;
214
215health_error:
216 return ret;
217}
218
219static int max17042_get_property(struct power_supply *psy,
220 enum power_supply_property psp,
221 union power_supply_propval *val)
222{
223 struct max17042_chip *chip = power_supply_get_drvdata(psy);
224 struct regmap *map = chip->regmap;
225 int ret;
226 u32 data;
227 u64 data64;
228
229 if (!chip->init_complete)
230 return -EAGAIN;
231
232 switch (psp) {
233 case POWER_SUPPLY_PROP_STATUS:
234 ret = max17042_get_status(chip, &val->intval);
235 if (ret < 0)
236 return ret;
237 break;
238 case POWER_SUPPLY_PROP_PRESENT:
239 ret = regmap_read(map, MAX17042_STATUS, &data);
240 if (ret < 0)
241 return ret;
242
243 if (data & MAX17042_STATUS_BattAbsent)
244 val->intval = 0;
245 else
246 val->intval = 1;
247 break;
248 case POWER_SUPPLY_PROP_TECHNOLOGY:
249 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
250 break;
251 case POWER_SUPPLY_PROP_CYCLE_COUNT:
252 ret = regmap_read(map, MAX17042_Cycles, &data);
253 if (ret < 0)
254 return ret;
255
256 val->intval = data;
257 break;
258 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
259 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
260 if (ret < 0)
261 return ret;
262
263 val->intval = data >> 8;
264 val->intval *= 20000;
265 break;
266 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
267 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
268 if (ret < 0)
269 return ret;
270
271 val->intval = (data & 0xff) * 20000;
272 break;
273 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
274 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
275 ret = regmap_read(map, MAX17042_V_empty, &data);
276 else
277 ret = regmap_read(map, MAX17047_V_empty, &data);
278 if (ret < 0)
279 return ret;
280
281 val->intval = data >> 7;
282 val->intval *= 10000;
283 break;
284 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
285 ret = regmap_read(map, MAX17042_VCELL, &data);
286 if (ret < 0)
287 return ret;
288
289 val->intval = data * 625 / 8;
290 break;
291 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
292 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
293 if (ret < 0)
294 return ret;
295
296 val->intval = data * 625 / 8;
297 break;
298 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
299 ret = regmap_read(map, MAX17042_OCVInternal, &data);
300 if (ret < 0)
301 return ret;
302
303 val->intval = data * 625 / 8;
304 break;
305 case POWER_SUPPLY_PROP_CAPACITY:
306 ret = regmap_read(map, MAX17042_RepSOC, &data);
307 if (ret < 0)
308 return ret;
309
310 val->intval = data >> 8;
311 break;
312 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
313 ret = regmap_read(map, MAX17042_DesignCap, &data);
314 if (ret < 0)
315 return ret;
316
317 data64 = data * 5000000ll;
318 do_div(data64, chip->pdata->r_sns);
319 val->intval = data64;
320 break;
321 case POWER_SUPPLY_PROP_CHARGE_FULL:
322 ret = regmap_read(map, MAX17042_FullCAP, &data);
323 if (ret < 0)
324 return ret;
325
326 data64 = data * 5000000ll;
327 do_div(data64, chip->pdata->r_sns);
328 val->intval = data64;
329 break;
330 case POWER_SUPPLY_PROP_CHARGE_NOW:
331 ret = regmap_read(map, MAX17042_RepCap, &data);
332 if (ret < 0)
333 return ret;
334
335 data64 = data * 5000000ll;
336 do_div(data64, chip->pdata->r_sns);
337 val->intval = data64;
338 break;
339 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
340 ret = regmap_read(map, MAX17042_QH, &data);
341 if (ret < 0)
342 return ret;
343
344 val->intval = data * 1000 / 2;
345 break;
346 case POWER_SUPPLY_PROP_TEMP:
347 ret = max17042_get_temperature(chip, &val->intval);
348 if (ret < 0)
349 return ret;
350 break;
351 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
352 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
353 if (ret < 0)
354 return ret;
355
356 val->intval = sign_extend32(data & 0xff, 7) * 10;
357 break;
358 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
359 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
360 if (ret < 0)
361 return ret;
362
363 val->intval = sign_extend32(data >> 8, 7) * 10;
364 break;
365 case POWER_SUPPLY_PROP_TEMP_MIN:
366 val->intval = chip->pdata->temp_min;
367 break;
368 case POWER_SUPPLY_PROP_TEMP_MAX:
369 val->intval = chip->pdata->temp_max;
370 break;
371 case POWER_SUPPLY_PROP_HEALTH:
372 ret = max17042_get_battery_health(chip, &val->intval);
373 if (ret < 0)
374 return ret;
375 break;
376 case POWER_SUPPLY_PROP_SCOPE:
377 val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
378 break;
379 case POWER_SUPPLY_PROP_CURRENT_NOW:
380 if (chip->pdata->enable_current_sense) {
381 ret = regmap_read(map, MAX17042_Current, &data);
382 if (ret < 0)
383 return ret;
384
385 val->intval = sign_extend32(data, 15);
386 val->intval *= 1562500 / chip->pdata->r_sns;
387 } else {
388 return -EINVAL;
389 }
390 break;
391 case POWER_SUPPLY_PROP_CURRENT_AVG:
392 if (chip->pdata->enable_current_sense) {
393 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
394 if (ret < 0)
395 return ret;
396
397 val->intval = sign_extend32(data, 15);
398 val->intval *= 1562500 / chip->pdata->r_sns;
399 } else {
400 return -EINVAL;
401 }
402 break;
403 default:
404 return -EINVAL;
405 }
406 return 0;
407}
408
409static int max17042_set_property(struct power_supply *psy,
410 enum power_supply_property psp,
411 const union power_supply_propval *val)
412{
413 struct max17042_chip *chip = power_supply_get_drvdata(psy);
414 struct regmap *map = chip->regmap;
415 int ret = 0;
416 u32 data;
417 int8_t temp;
418
419 switch (psp) {
420 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
421 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
422 if (ret < 0)
423 return ret;
424
425
426 temp = val->intval / 10;
427
428 if (temp >= (int8_t)(data >> 8))
429 temp = (int8_t)(data >> 8) - 1;
430
431 data = (data & 0xff00) + temp;
432 ret = regmap_write(map, MAX17042_TALRT_Th, data);
433 break;
434 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
435 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
436 if (ret < 0)
437 return ret;
438
439
440 temp = val->intval / 10;
441
442 if (temp <= (int8_t)(data & 0xff))
443 temp = (int8_t)(data & 0xff) + 1;
444
445 data = (data & 0xff) + (temp << 8);
446 ret = regmap_write(map, MAX17042_TALRT_Th, data);
447 break;
448 default:
449 ret = -EINVAL;
450 }
451
452 return ret;
453}
454
455static int max17042_property_is_writeable(struct power_supply *psy,
456 enum power_supply_property psp)
457{
458 int ret;
459
460 switch (psp) {
461 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
462 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
463 ret = 1;
464 break;
465 default:
466 ret = 0;
467 }
468
469 return ret;
470}
471
472static void max17042_external_power_changed(struct power_supply *psy)
473{
474 power_supply_changed(psy);
475}
476
477static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
478{
479 int retries = 8;
480 int ret;
481 u32 read_value;
482
483 do {
484 ret = regmap_write(map, reg, value);
485 regmap_read(map, reg, &read_value);
486 if (read_value != value) {
487 ret = -EIO;
488 retries--;
489 }
490 } while (retries && read_value != value);
491
492 if (ret < 0)
493 pr_err("%s: err %d\n", __func__, ret);
494
495 return ret;
496}
497
498static inline void max17042_override_por(struct regmap *map,
499 u8 reg, u16 value)
500{
501 if (value)
502 regmap_write(map, reg, value);
503}
504
505static inline void max10742_unlock_model(struct max17042_chip *chip)
506{
507 struct regmap *map = chip->regmap;
508
509 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
510 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
511}
512
513static inline void max10742_lock_model(struct max17042_chip *chip)
514{
515 struct regmap *map = chip->regmap;
516
517 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
518 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
519}
520
521static inline void max17042_write_model_data(struct max17042_chip *chip,
522 u8 addr, int size)
523{
524 struct regmap *map = chip->regmap;
525 int i;
526
527 for (i = 0; i < size; i++)
528 regmap_write(map, addr + i,
529 chip->pdata->config_data->cell_char_tbl[i]);
530}
531
532static inline void max17042_read_model_data(struct max17042_chip *chip,
533 u8 addr, u16 *data, int size)
534{
535 struct regmap *map = chip->regmap;
536 int i;
537 u32 tmp;
538
539 for (i = 0; i < size; i++) {
540 regmap_read(map, addr + i, &tmp);
541 data[i] = (u16)tmp;
542 }
543}
544
545static inline int max17042_model_data_compare(struct max17042_chip *chip,
546 u16 *data1, u16 *data2, int size)
547{
548 int i;
549
550 if (memcmp(data1, data2, size)) {
551 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
552 for (i = 0; i < size; i++)
553 dev_info(&chip->client->dev, "0x%x, 0x%x",
554 data1[i], data2[i]);
555 dev_info(&chip->client->dev, "\n");
556 return -EINVAL;
557 }
558 return 0;
559}
560
561static int max17042_init_model(struct max17042_chip *chip)
562{
563 int ret;
564 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
565 u16 *temp_data;
566
567 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
568 if (!temp_data)
569 return -ENOMEM;
570
571 max10742_unlock_model(chip);
572 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
573 table_size);
574 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
575 table_size);
576
577 ret = max17042_model_data_compare(
578 chip,
579 chip->pdata->config_data->cell_char_tbl,
580 temp_data,
581 table_size);
582
583 max10742_lock_model(chip);
584 kfree(temp_data);
585
586 return ret;
587}
588
589static int max17042_verify_model_lock(struct max17042_chip *chip)
590{
591 int i;
592 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
593 u16 *temp_data;
594 int ret = 0;
595
596 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
597 if (!temp_data)
598 return -ENOMEM;
599
600 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
601 table_size);
602 for (i = 0; i < table_size; i++)
603 if (temp_data[i])
604 ret = -EINVAL;
605
606 kfree(temp_data);
607 return ret;
608}
609
610static void max17042_write_config_regs(struct max17042_chip *chip)
611{
612 struct max17042_config_data *config = chip->pdata->config_data;
613 struct regmap *map = chip->regmap;
614
615 regmap_write(map, MAX17042_CONFIG, config->config);
616 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
617 regmap_write(map, MAX17042_FilterCFG,
618 config->filter_cfg);
619 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
620 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
621 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
622 regmap_write(map, MAX17047_FullSOCThr,
623 config->full_soc_thresh);
624}
625
626static void max17042_write_custom_regs(struct max17042_chip *chip)
627{
628 struct max17042_config_data *config = chip->pdata->config_data;
629 struct regmap *map = chip->regmap;
630
631 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
632 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
633 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
634 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
635 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
636 max17042_write_verify_reg(map, MAX17042_K_empty0,
637 config->kempty0);
638 } else {
639 max17042_write_verify_reg(map, MAX17047_QRTbl00,
640 config->qrtbl00);
641 max17042_write_verify_reg(map, MAX17047_QRTbl10,
642 config->qrtbl10);
643 max17042_write_verify_reg(map, MAX17047_QRTbl20,
644 config->qrtbl20);
645 max17042_write_verify_reg(map, MAX17047_QRTbl30,
646 config->qrtbl30);
647 }
648}
649
650static void max17042_update_capacity_regs(struct max17042_chip *chip)
651{
652 struct max17042_config_data *config = chip->pdata->config_data;
653 struct regmap *map = chip->regmap;
654
655 max17042_write_verify_reg(map, MAX17042_FullCAP,
656 config->fullcap);
657 regmap_write(map, MAX17042_DesignCap, config->design_cap);
658 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
659 config->fullcapnom);
660}
661
662static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
663{
664 unsigned int vfSoc;
665 struct regmap *map = chip->regmap;
666
667 regmap_read(map, MAX17042_VFSOC, &vfSoc);
668 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
669 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
670 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
671}
672
673static void max17042_load_new_capacity_params(struct max17042_chip *chip)
674{
675 u32 full_cap0, rep_cap, dq_acc, vfSoc;
676 u32 rem_cap;
677
678 struct max17042_config_data *config = chip->pdata->config_data;
679 struct regmap *map = chip->regmap;
680
681 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
682 regmap_read(map, MAX17042_VFSOC, &vfSoc);
683
684
685
686
687
688 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
689 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
690
691 rep_cap = rem_cap;
692 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
693
694
695 dq_acc = config->fullcap / dQ_ACC_DIV;
696 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
697 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
698
699 max17042_write_verify_reg(map, MAX17042_FullCAP,
700 config->fullcap);
701 regmap_write(map, MAX17042_DesignCap,
702 config->design_cap);
703 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
704 config->fullcapnom);
705
706 regmap_write(map, MAX17042_RepSOC, vfSoc);
707}
708
709
710
711
712
713
714static inline void max17042_override_por_values(struct max17042_chip *chip)
715{
716 struct regmap *map = chip->regmap;
717 struct max17042_config_data *config = chip->pdata->config_data;
718
719 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
720 max17042_override_por(map, MAx17042_TOFF, config->toff);
721 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
722 max17042_override_por(map, MAX17042_COFF, config->coff);
723
724 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
725 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
726 max17042_override_por(map, MAX17042_SALRT_Th,
727 config->soc_alrt_thresh);
728 max17042_override_por(map, MAX17042_CONFIG, config->config);
729 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
730
731 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
732 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
733
734 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
735 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
736 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
737 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
738 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
739 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
740
741 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
742 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
743 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
744 max17042_override_por(map, MAX17042_SOC_empty,
745 config->socempty);
746 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
747 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
748 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
749
750 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
751 max17042_override_por(map, MAX17042_V_empty, config->vempty);
752 else
753 max17042_override_por(map, MAX17047_V_empty, config->vempty);
754 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
755 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
756 max17042_override_por(map, MAX17042_FCTC, config->fctc);
757 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
758 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
759 if (chip->chip_type) {
760 max17042_override_por(map, MAX17042_EmptyTempCo,
761 config->empty_tempco);
762 max17042_override_por(map, MAX17042_K_empty0,
763 config->kempty0);
764 }
765}
766
767static int max17042_init_chip(struct max17042_chip *chip)
768{
769 struct regmap *map = chip->regmap;
770 int ret;
771
772 max17042_override_por_values(chip);
773
774
775
776 msleep(500);
777
778
779 max17042_write_config_regs(chip);
780
781
782 ret = max17042_init_model(chip);
783 if (ret) {
784 dev_err(&chip->client->dev, "%s init failed\n",
785 __func__);
786 return -EIO;
787 }
788
789 ret = max17042_verify_model_lock(chip);
790 if (ret) {
791 dev_err(&chip->client->dev, "%s lock verify failed\n",
792 __func__);
793 return -EIO;
794 }
795
796 max17042_write_custom_regs(chip);
797
798
799 max17042_update_capacity_regs(chip);
800
801
802
803
804 msleep(350);
805
806
807 max17042_reset_vfsoc0_reg(chip);
808
809
810 max17042_load_new_capacity_params(chip);
811
812
813 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
814 return 0;
815}
816
817static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
818{
819 struct regmap *map = chip->regmap;
820 u32 soc, soc_tr;
821
822
823
824
825 regmap_read(map, MAX17042_RepSOC, &soc);
826 soc >>= 8;
827 soc_tr = (soc + off) << 8;
828 soc_tr |= (soc - off);
829 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
830}
831
832static irqreturn_t max17042_thread_handler(int id, void *dev)
833{
834 struct max17042_chip *chip = dev;
835 u32 val;
836
837 regmap_read(chip->regmap, MAX17042_STATUS, &val);
838 if ((val & STATUS_INTR_SOCMIN_BIT) ||
839 (val & STATUS_INTR_SOCMAX_BIT)) {
840 dev_info(&chip->client->dev, "SOC threshold INTR\n");
841 max17042_set_soc_threshold(chip, 1);
842 }
843
844 power_supply_changed(chip->battery);
845 return IRQ_HANDLED;
846}
847
848static void max17042_init_worker(struct work_struct *work)
849{
850 struct max17042_chip *chip = container_of(work,
851 struct max17042_chip, work);
852 int ret;
853
854
855 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
856 ret = max17042_init_chip(chip);
857 if (ret)
858 return;
859 }
860
861 chip->init_complete = 1;
862}
863
864#ifdef CONFIG_OF
865static struct max17042_platform_data *
866max17042_get_pdata(struct max17042_chip *chip)
867{
868 struct device *dev = &chip->client->dev;
869 struct device_node *np = dev->of_node;
870 u32 prop;
871 struct max17042_platform_data *pdata;
872
873 if (!np)
874 return dev->platform_data;
875
876 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
877 if (!pdata)
878 return NULL;
879
880
881
882
883
884 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
885 pdata->r_sns = prop;
886 pdata->enable_current_sense = true;
887 }
888
889 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
890 pdata->temp_min = INT_MIN;
891 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
892 pdata->temp_max = INT_MAX;
893 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
894 pdata->vmin = INT_MIN;
895 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
896 pdata->vmax = INT_MAX;
897
898 return pdata;
899}
900#else
901static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
902
903
904
905
906 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
907};
908
909static struct max17042_platform_data *
910max17042_get_pdata(struct max17042_chip *chip)
911{
912 struct device *dev = &chip->client->dev;
913 struct max17042_platform_data *pdata;
914 int ret, misc_cfg;
915
916 if (dev->platform_data)
917 return dev->platform_data;
918
919
920
921
922
923
924 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
925 if (!pdata)
926 return pdata;
927
928 if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
929 pdata->init_data = max17047_default_pdata_init_regs;
930 pdata->num_init_data =
931 ARRAY_SIZE(max17047_default_pdata_init_regs);
932 }
933
934 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
935 if (ret < 0)
936 return NULL;
937
938
939 if ((misc_cfg & 0x3) == 0x3)
940 pdata->enable_current_sense = false;
941 else
942 pdata->enable_current_sense = true;
943
944 pdata->vmin = MAX17042_DEFAULT_VMIN;
945 pdata->vmax = MAX17042_DEFAULT_VMAX;
946 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
947 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
948
949 return pdata;
950}
951#endif
952
953static const struct regmap_config max17042_regmap_config = {
954 .reg_bits = 8,
955 .val_bits = 16,
956 .val_format_endian = REGMAP_ENDIAN_NATIVE,
957};
958
959static const struct power_supply_desc max17042_psy_desc = {
960 .name = "max170xx_battery",
961 .type = POWER_SUPPLY_TYPE_BATTERY,
962 .get_property = max17042_get_property,
963 .set_property = max17042_set_property,
964 .property_is_writeable = max17042_property_is_writeable,
965 .external_power_changed = max17042_external_power_changed,
966 .properties = max17042_battery_props,
967 .num_properties = ARRAY_SIZE(max17042_battery_props),
968};
969
970static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
971 .name = "max170xx_battery",
972 .type = POWER_SUPPLY_TYPE_BATTERY,
973 .get_property = max17042_get_property,
974 .set_property = max17042_set_property,
975 .property_is_writeable = max17042_property_is_writeable,
976 .properties = max17042_battery_props,
977 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
978};
979
980static int max17042_probe(struct i2c_client *client,
981 const struct i2c_device_id *id)
982{
983 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
984 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
985 struct power_supply_config psy_cfg = {};
986 const struct acpi_device_id *acpi_id = NULL;
987 struct device *dev = &client->dev;
988 struct max17042_chip *chip;
989 int ret;
990 int i;
991 u32 val;
992
993 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
994 return -EIO;
995
996 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
997 if (!chip)
998 return -ENOMEM;
999
1000 chip->client = client;
1001 if (id) {
1002 chip->chip_type = id->driver_data;
1003 } else {
1004 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
1005 if (!acpi_id)
1006 return -ENODEV;
1007
1008 chip->chip_type = acpi_id->driver_data;
1009 }
1010 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
1011 if (IS_ERR(chip->regmap)) {
1012 dev_err(&client->dev, "Failed to initialize regmap\n");
1013 return -EINVAL;
1014 }
1015
1016 chip->pdata = max17042_get_pdata(chip);
1017 if (!chip->pdata) {
1018 dev_err(&client->dev, "no platform data provided\n");
1019 return -EINVAL;
1020 }
1021
1022 i2c_set_clientdata(client, chip);
1023 psy_cfg.drv_data = chip;
1024
1025
1026
1027 if (!chip->pdata->enable_current_sense)
1028 max17042_desc = &max17042_no_current_sense_psy_desc;
1029
1030 if (chip->pdata->r_sns == 0)
1031 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1032
1033 if (chip->pdata->init_data)
1034 for (i = 0; i < chip->pdata->num_init_data; i++)
1035 regmap_write(chip->regmap,
1036 chip->pdata->init_data[i].addr,
1037 chip->pdata->init_data[i].data);
1038
1039 if (!chip->pdata->enable_current_sense) {
1040 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1041 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1042 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1043 }
1044
1045 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1046 &psy_cfg);
1047 if (IS_ERR(chip->battery)) {
1048 dev_err(&client->dev, "failed: power supply register\n");
1049 return PTR_ERR(chip->battery);
1050 }
1051
1052 if (client->irq) {
1053 unsigned int flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
1054
1055
1056
1057
1058
1059 if (acpi_id)
1060 flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
1061
1062 ret = devm_request_threaded_irq(&client->dev, client->irq,
1063 NULL,
1064 max17042_thread_handler, flags,
1065 chip->battery->desc->name,
1066 chip);
1067 if (!ret) {
1068 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1069 CONFIG_ALRT_BIT_ENBL,
1070 CONFIG_ALRT_BIT_ENBL);
1071 max17042_set_soc_threshold(chip, 1);
1072 } else {
1073 client->irq = 0;
1074 if (ret != -EBUSY)
1075 dev_err(&client->dev, "Failed to get IRQ\n");
1076 }
1077 }
1078
1079 if (!client->irq)
1080 regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
1081
1082 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1083 if (val & STATUS_POR_BIT) {
1084 INIT_WORK(&chip->work, max17042_init_worker);
1085 schedule_work(&chip->work);
1086 } else {
1087 chip->init_complete = 1;
1088 }
1089
1090 return 0;
1091}
1092
1093#ifdef CONFIG_PM_SLEEP
1094static int max17042_suspend(struct device *dev)
1095{
1096 struct max17042_chip *chip = dev_get_drvdata(dev);
1097
1098
1099
1100
1101
1102 if (chip->client->irq) {
1103 disable_irq(chip->client->irq);
1104 enable_irq_wake(chip->client->irq);
1105 }
1106
1107 return 0;
1108}
1109
1110static int max17042_resume(struct device *dev)
1111{
1112 struct max17042_chip *chip = dev_get_drvdata(dev);
1113
1114 if (chip->client->irq) {
1115 disable_irq_wake(chip->client->irq);
1116 enable_irq(chip->client->irq);
1117
1118 max17042_set_soc_threshold(chip, 1);
1119 }
1120
1121 return 0;
1122}
1123#endif
1124
1125static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1126 max17042_resume);
1127
1128#ifdef CONFIG_ACPI
1129static const struct acpi_device_id max17042_acpi_match[] = {
1130 { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
1131 { }
1132};
1133MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
1134#endif
1135
1136#ifdef CONFIG_OF
1137static const struct of_device_id max17042_dt_match[] = {
1138 { .compatible = "maxim,max17042" },
1139 { .compatible = "maxim,max17047" },
1140 { .compatible = "maxim,max17050" },
1141 { },
1142};
1143MODULE_DEVICE_TABLE(of, max17042_dt_match);
1144#endif
1145
1146static const struct i2c_device_id max17042_id[] = {
1147 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1148 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1149 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1150 { }
1151};
1152MODULE_DEVICE_TABLE(i2c, max17042_id);
1153
1154static struct i2c_driver max17042_i2c_driver = {
1155 .driver = {
1156 .name = "max17042",
1157 .acpi_match_table = ACPI_PTR(max17042_acpi_match),
1158 .of_match_table = of_match_ptr(max17042_dt_match),
1159 .pm = &max17042_pm_ops,
1160 },
1161 .probe = max17042_probe,
1162 .id_table = max17042_id,
1163};
1164module_i2c_driver(max17042_i2c_driver);
1165
1166MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1167MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1168MODULE_LICENSE("GPL");
1169
