1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Fuel gauge driver for Maxim 17042 / 8966 / 8997
4 // Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
5 //
6 // Copyright (C) 2011 Samsung Electronics
7 // MyungJoo Ham <myungjoo.ham@samsung.com>
8 //
9 // This driver is based on max17040_battery.c
10
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 /* Status register bits */
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 /* Interrupt mask bits */
39 #define CFG_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 /* 50 mV */
53
54 struct 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
64 static 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 // these two have to be at the end on the list
90 POWER_SUPPLY_PROP_CURRENT_NOW,
91 POWER_SUPPLY_PROP_CURRENT_AVG,
92 };
93
max17042_get_temperature(struct max17042_chip * chip,int * temp)94 static 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 /* The value is converted into deci-centigrade scale */
106 /* Units of LSB = 1 / 256 degree Celsius */
107 *temp = *temp * 10 / 256;
108 return 0;
109 }
110
max17042_get_status(struct max17042_chip * chip,int * status)111 static 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 * The MAX170xx has builtin end-of-charge detection and will update
129 * FullCAP to match RepCap when it detects end of charging.
130 *
131 * When this cycle the battery gets charged to a higher (calculated)
132 * capacity then the previous cycle then FullCAP will get updated
133 * continuously once end-of-charge detection kicks in, so allow the
134 * 2 to differ a bit.
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 * Even though we are supplied, we may still be discharging if the
152 * supply is e.g. only delivering 5V 0.5A. Check current if available.
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
max17042_get_battery_health(struct max17042_chip * chip,int * health)174 static 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 /* bits [0-3] unused */
184 vavg = val * 625 / 8;
185 /* Convert to millivolts */
186 vavg /= 1000;
187
188 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
189 if (ret < 0)
190 goto health_error;
191
192 /* bits [0-3] unused */
193 vbatt = val * 625 / 8;
194 /* Convert to millivolts */
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
223 out:
224 return 0;
225
226 health_error:
227 return ret;
228 }
229
max17042_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)230 static 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; /* Units of LSB = 20mV */
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; /* Units of 20mV */
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; /* Units of LSB = 10mV */
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 /* LSB is Alert Minimum. In deci-centigrade */
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 /* MSB is Alert Maximum. In deci-centigrade */
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
max17042_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)439 static 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 /* Input in deci-centigrade, convert to centigrade */
456 temp = val->intval / 10;
457 /* force min < max */
458 if (temp >= (int8_t)(data >> 8))
459 temp = (int8_t)(data >> 8) - 1;
460 /* Write both MAX and MIN ALERT */
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 /* Input in Deci-Centigrade, convert to centigrade */
470 temp = val->intval / 10;
471 /* force max > min */
472 if (temp <= (int8_t)(data & 0xff))
473 temp = (int8_t)(data & 0xff) + 1;
474 /* Write both MAX and MIN ALERT */
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
max17042_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)485 static 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
max17042_write_verify_reg(struct regmap * map,u8 reg,u32 value)502 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
503 {
504 int retries = 8;
505 int ret;
506 u32 read_value;
507
508 do {
509 ret = regmap_write(map, reg, value);
510 regmap_read(map, reg, &read_value);
511 if (read_value != value) {
512 ret = -EIO;
513 retries--;
514 }
515 } while (retries && read_value != value);
516
517 if (ret < 0)
518 pr_err("%s: err %d\n", __func__, ret);
519
520 return ret;
521 }
522
max17042_override_por(struct regmap * map,u8 reg,u16 value)523 static inline void max17042_override_por(struct regmap *map,
524 u8 reg, u16 value)
525 {
526 if (value)
527 regmap_write(map, reg, value);
528 }
529
max17042_unlock_model(struct max17042_chip * chip)530 static inline void max17042_unlock_model(struct max17042_chip *chip)
531 {
532 struct regmap *map = chip->regmap;
533
534 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
535 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
536 }
537
max17042_lock_model(struct max17042_chip * chip)538 static inline void max17042_lock_model(struct max17042_chip *chip)
539 {
540 struct regmap *map = chip->regmap;
541
542 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
543 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
544 }
545
max17042_write_model_data(struct max17042_chip * chip,u8 addr,int size)546 static inline void max17042_write_model_data(struct max17042_chip *chip,
547 u8 addr, int size)
548 {
549 struct regmap *map = chip->regmap;
550 int i;
551
552 for (i = 0; i < size; i++)
553 regmap_write(map, addr + i,
554 chip->pdata->config_data->cell_char_tbl[i]);
555 }
556
max17042_read_model_data(struct max17042_chip * chip,u8 addr,u16 * data,int size)557 static inline void max17042_read_model_data(struct max17042_chip *chip,
558 u8 addr, u16 *data, int size)
559 {
560 struct regmap *map = chip->regmap;
561 int i;
562 u32 tmp;
563
564 for (i = 0; i < size; i++) {
565 regmap_read(map, addr + i, &tmp);
566 data[i] = (u16)tmp;
567 }
568 }
569
max17042_model_data_compare(struct max17042_chip * chip,u16 * data1,u16 * data2,int size)570 static inline int max17042_model_data_compare(struct max17042_chip *chip,
571 u16 *data1, u16 *data2, int size)
572 {
573 int i;
574
575 if (memcmp(data1, data2, size)) {
576 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
577 for (i = 0; i < size; i++)
578 dev_info(&chip->client->dev, "0x%x, 0x%x",
579 data1[i], data2[i]);
580 dev_info(&chip->client->dev, "\n");
581 return -EINVAL;
582 }
583 return 0;
584 }
585
max17042_init_model(struct max17042_chip * chip)586 static int max17042_init_model(struct max17042_chip *chip)
587 {
588 int ret;
589 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
590 u16 *temp_data;
591
592 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
593 if (!temp_data)
594 return -ENOMEM;
595
596 max17042_unlock_model(chip);
597 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
598 table_size);
599 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
600 table_size);
601
602 ret = max17042_model_data_compare(
603 chip,
604 chip->pdata->config_data->cell_char_tbl,
605 temp_data,
606 table_size);
607
608 max17042_lock_model(chip);
609 kfree(temp_data);
610
611 return ret;
612 }
613
max17042_verify_model_lock(struct max17042_chip * chip)614 static int max17042_verify_model_lock(struct max17042_chip *chip)
615 {
616 int i;
617 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
618 u16 *temp_data;
619 int ret = 0;
620
621 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
622 if (!temp_data)
623 return -ENOMEM;
624
625 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
626 table_size);
627 for (i = 0; i < table_size; i++)
628 if (temp_data[i])
629 ret = -EINVAL;
630
631 kfree(temp_data);
632 return ret;
633 }
634
max17042_write_config_regs(struct max17042_chip * chip)635 static void max17042_write_config_regs(struct max17042_chip *chip)
636 {
637 struct max17042_config_data *config = chip->pdata->config_data;
638 struct regmap *map = chip->regmap;
639
640 regmap_write(map, MAX17042_CONFIG, config->config);
641 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
642 regmap_write(map, MAX17042_FilterCFG,
643 config->filter_cfg);
644 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
645 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
646 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050 ||
647 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)
648 regmap_write(map, MAX17047_FullSOCThr,
649 config->full_soc_thresh);
650 }
651
max17042_write_custom_regs(struct max17042_chip * chip)652 static void max17042_write_custom_regs(struct max17042_chip *chip)
653 {
654 struct max17042_config_data *config = chip->pdata->config_data;
655 struct regmap *map = chip->regmap;
656
657 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
658 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
659 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
660 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
661 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
662 max17042_write_verify_reg(map, MAX17042_K_empty0,
663 config->kempty0);
664 } else {
665 max17042_write_verify_reg(map, MAX17047_QRTbl00,
666 config->qrtbl00);
667 max17042_write_verify_reg(map, MAX17047_QRTbl10,
668 config->qrtbl10);
669 max17042_write_verify_reg(map, MAX17047_QRTbl20,
670 config->qrtbl20);
671 max17042_write_verify_reg(map, MAX17047_QRTbl30,
672 config->qrtbl30);
673 }
674 }
675
max17042_update_capacity_regs(struct max17042_chip * chip)676 static void max17042_update_capacity_regs(struct max17042_chip *chip)
677 {
678 struct max17042_config_data *config = chip->pdata->config_data;
679 struct regmap *map = chip->regmap;
680
681 max17042_write_verify_reg(map, MAX17042_FullCAP,
682 config->fullcap);
683 regmap_write(map, MAX17042_DesignCap, config->design_cap);
684 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
685 config->fullcapnom);
686 }
687
max17042_reset_vfsoc0_reg(struct max17042_chip * chip)688 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
689 {
690 unsigned int vfSoc;
691 struct regmap *map = chip->regmap;
692
693 regmap_read(map, MAX17042_VFSOC, &vfSoc);
694 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
695 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
696 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
697 }
698
max17042_load_new_capacity_params(struct max17042_chip * chip)699 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
700 {
701 u32 full_cap0, rep_cap, dq_acc, vfSoc;
702 u32 rem_cap;
703
704 struct max17042_config_data *config = chip->pdata->config_data;
705 struct regmap *map = chip->regmap;
706
707 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
708 regmap_read(map, MAX17042_VFSOC, &vfSoc);
709
710 /* fg_vfSoc needs to shifted by 8 bits to get the
711 * perc in 1% accuracy, to get the right rem_cap multiply
712 * full_cap0, fg_vfSoc and devide by 100
713 */
714 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
715 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
716
717 rep_cap = rem_cap;
718 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
719
720 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
721 dq_acc = config->fullcap / dQ_ACC_DIV;
722 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
723 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
724
725 max17042_write_verify_reg(map, MAX17042_FullCAP,
726 config->fullcap);
727 regmap_write(map, MAX17042_DesignCap,
728 config->design_cap);
729 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
730 config->fullcapnom);
731 /* Update SOC register with new SOC */
732 regmap_write(map, MAX17042_RepSOC, vfSoc);
733 }
734
735 /*
736 * Block write all the override values coming from platform data.
737 * This function MUST be called before the POR initialization procedure
738 * specified by maxim.
739 */
max17042_override_por_values(struct max17042_chip * chip)740 static inline void max17042_override_por_values(struct max17042_chip *chip)
741 {
742 struct regmap *map = chip->regmap;
743 struct max17042_config_data *config = chip->pdata->config_data;
744
745 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
746 max17042_override_por(map, MAX17042_TOFF, config->toff);
747 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
748 max17042_override_por(map, MAX17042_COFF, config->coff);
749
750 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
751 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
752 max17042_override_por(map, MAX17042_SALRT_Th,
753 config->soc_alrt_thresh);
754 max17042_override_por(map, MAX17042_CONFIG, config->config);
755 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
756
757 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
758 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
759
760 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
761 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
762 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
763 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
764 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
765
766 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
767 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
768 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
769 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
770
771 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
772 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
773
774 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
775 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
776 max17042_override_por(map, MAX17042_SOC_empty, config->socempty);
777 max17042_override_por(map, MAX17042_V_empty, config->vempty);
778 max17042_override_por(map, MAX17042_EmptyTempCo, config->empty_tempco);
779 max17042_override_por(map, MAX17042_K_empty0, config->kempty0);
780 }
781
782 if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) ||
783 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
784 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) {
785 max17042_override_por(map, MAX17042_IAvg_empty, config->iavg_empty);
786 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
787 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
788 max17042_override_por(map, MAX17042_FCTC, config->fctc);
789 }
790
791 if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
792 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050) ||
793 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)) {
794 max17042_override_por(map, MAX17047_V_empty, config->vempty);
795 }
796 }
797
max17042_init_chip(struct max17042_chip * chip)798 static int max17042_init_chip(struct max17042_chip *chip)
799 {
800 struct regmap *map = chip->regmap;
801 int ret;
802
803 max17042_override_por_values(chip);
804 /* After Power up, the MAX17042 requires 500mS in order
805 * to perform signal debouncing and initial SOC reporting
806 */
807 msleep(500);
808
809 /* Initialize configuration */
810 max17042_write_config_regs(chip);
811
812 /* write cell characterization data */
813 ret = max17042_init_model(chip);
814 if (ret) {
815 dev_err(&chip->client->dev, "%s init failed\n",
816 __func__);
817 return -EIO;
818 }
819
820 ret = max17042_verify_model_lock(chip);
821 if (ret) {
822 dev_err(&chip->client->dev, "%s lock verify failed\n",
823 __func__);
824 return -EIO;
825 }
826 /* write custom parameters */
827 max17042_write_custom_regs(chip);
828
829 /* update capacity params */
830 max17042_update_capacity_regs(chip);
831
832 /* delay must be atleast 350mS to allow VFSOC
833 * to be calculated from the new configuration
834 */
835 msleep(350);
836
837 /* reset vfsoc0 reg */
838 max17042_reset_vfsoc0_reg(chip);
839
840 /* load new capacity params */
841 max17042_load_new_capacity_params(chip);
842
843 /* Init complete, Clear the POR bit */
844 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
845 return 0;
846 }
847
max17042_set_soc_threshold(struct max17042_chip * chip,u16 off)848 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
849 {
850 struct regmap *map = chip->regmap;
851 u32 soc, soc_tr;
852
853 /* program interrupt thresholds such that we should
854 * get interrupt for every 'off' perc change in the soc
855 */
856 if (chip->pdata->enable_current_sense)
857 regmap_read(map, MAX17042_RepSOC, &soc);
858 else
859 regmap_read(map, MAX17042_VFSOC, &soc);
860 soc >>= 8;
861 soc_tr = (soc + off) << 8;
862 if (off < soc)
863 soc_tr |= soc - off;
864 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
865 }
866
max17042_thread_handler(int id,void * dev)867 static irqreturn_t max17042_thread_handler(int id, void *dev)
868 {
869 struct max17042_chip *chip = dev;
870 u32 val;
871 int ret;
872
873 ret = regmap_read(chip->regmap, MAX17042_STATUS, &val);
874 if (ret)
875 return IRQ_HANDLED;
876
877 if ((val & STATUS_SMN_BIT) || (val & STATUS_SMX_BIT)) {
878 dev_dbg(&chip->client->dev, "SOC threshold INTR\n");
879 max17042_set_soc_threshold(chip, 1);
880 }
881
882 /* we implicitly handle all alerts via power_supply_changed */
883 regmap_clear_bits(chip->regmap, MAX17042_STATUS,
884 0xFFFF & ~(STATUS_POR_BIT | STATUS_BST_BIT));
885
886 power_supply_changed(chip->battery);
887 return IRQ_HANDLED;
888 }
889
max17042_init_worker(struct work_struct * work)890 static void max17042_init_worker(struct work_struct *work)
891 {
892 struct max17042_chip *chip = container_of(work,
893 struct max17042_chip, work);
894 int ret;
895
896 /* Initialize registers according to values from the platform data */
897 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
898 ret = max17042_init_chip(chip);
899 if (ret)
900 return;
901 }
902
903 chip->init_complete = 1;
904 }
905
906 #ifdef CONFIG_OF
907 static struct max17042_platform_data *
max17042_get_of_pdata(struct max17042_chip * chip)908 max17042_get_of_pdata(struct max17042_chip *chip)
909 {
910 struct device *dev = &chip->client->dev;
911 struct device_node *np = dev->of_node;
912 u32 prop;
913 struct max17042_platform_data *pdata;
914
915 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
916 if (!pdata)
917 return NULL;
918
919 /*
920 * Require current sense resistor value to be specified for
921 * current-sense functionality to be enabled at all.
922 */
923 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
924 pdata->r_sns = prop;
925 pdata->enable_current_sense = true;
926 }
927
928 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
929 pdata->temp_min = INT_MIN;
930 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
931 pdata->temp_max = INT_MAX;
932 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
933 pdata->vmin = INT_MIN;
934 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
935 pdata->vmax = INT_MAX;
936
937 return pdata;
938 }
939 #endif
940
941 static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
942 /*
943 * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
944 * when the voltage FG reports 95%, as recommended in the datasheet.
945 */
946 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
947 };
948
949 static struct max17042_platform_data *
max17042_get_default_pdata(struct max17042_chip * chip)950 max17042_get_default_pdata(struct max17042_chip *chip)
951 {
952 struct device *dev = &chip->client->dev;
953 struct max17042_platform_data *pdata;
954 int ret, misc_cfg;
955
956 /*
957 * The MAX17047 gets used on x86 where we might not have pdata, assume
958 * the firmware will already have initialized the fuel-gauge and provide
959 * default values for the non init bits to make things work.
960 */
961 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
962 if (!pdata)
963 return pdata;
964
965 if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
966 (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) {
967 pdata->init_data = max17047_default_pdata_init_regs;
968 pdata->num_init_data =
969 ARRAY_SIZE(max17047_default_pdata_init_regs);
970 }
971
972 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
973 if (ret < 0)
974 return NULL;
975
976 /* If bits 0-1 are set to 3 then only Voltage readings are used */
977 if ((misc_cfg & 0x3) == 0x3)
978 pdata->enable_current_sense = false;
979 else
980 pdata->enable_current_sense = true;
981
982 pdata->vmin = MAX17042_DEFAULT_VMIN;
983 pdata->vmax = MAX17042_DEFAULT_VMAX;
984 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
985 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
986
987 return pdata;
988 }
989
990 static struct max17042_platform_data *
max17042_get_pdata(struct max17042_chip * chip)991 max17042_get_pdata(struct max17042_chip *chip)
992 {
993 struct device *dev = &chip->client->dev;
994
995 #ifdef CONFIG_OF
996 if (dev->of_node)
997 return max17042_get_of_pdata(chip);
998 #endif
999 if (dev->platform_data)
1000 return dev->platform_data;
1001
1002 return max17042_get_default_pdata(chip);
1003 }
1004
1005 static const struct regmap_config max17042_regmap_config = {
1006 .reg_bits = 8,
1007 .val_bits = 16,
1008 .val_format_endian = REGMAP_ENDIAN_NATIVE,
1009 };
1010
1011 static const struct power_supply_desc max17042_psy_desc = {
1012 .name = "max170xx_battery",
1013 .type = POWER_SUPPLY_TYPE_BATTERY,
1014 .get_property = max17042_get_property,
1015 .set_property = max17042_set_property,
1016 .property_is_writeable = max17042_property_is_writeable,
1017 .external_power_changed = power_supply_changed,
1018 .properties = max17042_battery_props,
1019 .num_properties = ARRAY_SIZE(max17042_battery_props),
1020 };
1021
1022 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
1023 .name = "max170xx_battery",
1024 .type = POWER_SUPPLY_TYPE_BATTERY,
1025 .get_property = max17042_get_property,
1026 .set_property = max17042_set_property,
1027 .property_is_writeable = max17042_property_is_writeable,
1028 .properties = max17042_battery_props,
1029 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
1030 };
1031
max17042_probe(struct i2c_client * client)1032 static int max17042_probe(struct i2c_client *client)
1033 {
1034 const struct i2c_device_id *id = i2c_client_get_device_id(client);
1035 struct i2c_adapter *adapter = client->adapter;
1036 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
1037 struct power_supply_config psy_cfg = {};
1038 const struct acpi_device_id *acpi_id = NULL;
1039 struct device *dev = &client->dev;
1040 struct max17042_chip *chip;
1041 int ret;
1042 int i;
1043 u32 val;
1044
1045 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
1046 return -EIO;
1047
1048 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1049 if (!chip)
1050 return -ENOMEM;
1051
1052 chip->client = client;
1053 if (id) {
1054 chip->chip_type = id->driver_data;
1055 } else {
1056 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
1057 if (!acpi_id)
1058 return -ENODEV;
1059
1060 chip->chip_type = acpi_id->driver_data;
1061 }
1062 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
1063 if (IS_ERR(chip->regmap)) {
1064 dev_err(&client->dev, "Failed to initialize regmap\n");
1065 return -EINVAL;
1066 }
1067
1068 chip->pdata = max17042_get_pdata(chip);
1069 if (!chip->pdata) {
1070 dev_err(&client->dev, "no platform data provided\n");
1071 return -EINVAL;
1072 }
1073
1074 i2c_set_clientdata(client, chip);
1075 psy_cfg.drv_data = chip;
1076 psy_cfg.of_node = dev->of_node;
1077
1078 /* When current is not measured,
1079 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
1080 if (!chip->pdata->enable_current_sense)
1081 max17042_desc = &max17042_no_current_sense_psy_desc;
1082
1083 if (chip->pdata->r_sns == 0)
1084 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1085
1086 if (chip->pdata->init_data)
1087 for (i = 0; i < chip->pdata->num_init_data; i++)
1088 regmap_write(chip->regmap,
1089 chip->pdata->init_data[i].addr,
1090 chip->pdata->init_data[i].data);
1091
1092 if (!chip->pdata->enable_current_sense) {
1093 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1094 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1095 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1096 }
1097
1098 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1099 &psy_cfg);
1100 if (IS_ERR(chip->battery)) {
1101 dev_err(&client->dev, "failed: power supply register\n");
1102 return PTR_ERR(chip->battery);
1103 }
1104
1105 if (client->irq) {
1106 unsigned int flags = IRQF_ONESHOT;
1107
1108 /*
1109 * On ACPI systems the IRQ may be handled by ACPI-event code,
1110 * so we need to share (if the ACPI code is willing to share).
1111 */
1112 if (acpi_id)
1113 flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
1114
1115 ret = devm_request_threaded_irq(&client->dev, client->irq,
1116 NULL,
1117 max17042_thread_handler, flags,
1118 chip->battery->desc->name,
1119 chip);
1120 if (!ret) {
1121 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1122 CFG_ALRT_BIT_ENBL,
1123 CFG_ALRT_BIT_ENBL);
1124 max17042_set_soc_threshold(chip, 1);
1125 } else {
1126 client->irq = 0;
1127 if (ret != -EBUSY)
1128 dev_err(&client->dev, "Failed to get IRQ\n");
1129 }
1130 }
1131 /* Not able to update the charge threshold when exceeded? -> disable */
1132 if (!client->irq)
1133 regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
1134
1135 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1136 if (val & STATUS_POR_BIT) {
1137 ret = devm_work_autocancel(&client->dev, &chip->work,
1138 max17042_init_worker);
1139 if (ret)
1140 return ret;
1141 schedule_work(&chip->work);
1142 } else {
1143 chip->init_complete = 1;
1144 }
1145
1146 return 0;
1147 }
1148
1149 #ifdef CONFIG_PM_SLEEP
max17042_suspend(struct device * dev)1150 static int max17042_suspend(struct device *dev)
1151 {
1152 struct max17042_chip *chip = dev_get_drvdata(dev);
1153
1154 /*
1155 * disable the irq and enable irq_wake
1156 * capability to the interrupt line.
1157 */
1158 if (chip->client->irq) {
1159 disable_irq(chip->client->irq);
1160 enable_irq_wake(chip->client->irq);
1161 }
1162
1163 return 0;
1164 }
1165
max17042_resume(struct device * dev)1166 static int max17042_resume(struct device *dev)
1167 {
1168 struct max17042_chip *chip = dev_get_drvdata(dev);
1169
1170 if (chip->client->irq) {
1171 disable_irq_wake(chip->client->irq);
1172 enable_irq(chip->client->irq);
1173 /* re-program the SOC thresholds to 1% change */
1174 max17042_set_soc_threshold(chip, 1);
1175 }
1176
1177 return 0;
1178 }
1179 #endif
1180
1181 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1182 max17042_resume);
1183
1184 #ifdef CONFIG_ACPI
1185 static const struct acpi_device_id max17042_acpi_match[] = {
1186 { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
1187 { }
1188 };
1189 MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
1190 #endif
1191
1192 #ifdef CONFIG_OF
1193 static const struct of_device_id max17042_dt_match[] = {
1194 { .compatible = "maxim,max17042" },
1195 { .compatible = "maxim,max17047" },
1196 { .compatible = "maxim,max17050" },
1197 { .compatible = "maxim,max17055" },
1198 { .compatible = "maxim,max77849-battery" },
1199 { },
1200 };
1201 MODULE_DEVICE_TABLE(of, max17042_dt_match);
1202 #endif
1203
1204 static const struct i2c_device_id max17042_id[] = {
1205 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1206 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1207 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1208 { "max17055", MAXIM_DEVICE_TYPE_MAX17055 },
1209 { "max77849-battery", MAXIM_DEVICE_TYPE_MAX17047 },
1210 { }
1211 };
1212 MODULE_DEVICE_TABLE(i2c, max17042_id);
1213
1214 static struct i2c_driver max17042_i2c_driver = {
1215 .driver = {
1216 .name = "max17042",
1217 .acpi_match_table = ACPI_PTR(max17042_acpi_match),
1218 .of_match_table = of_match_ptr(max17042_dt_match),
1219 .pm = &max17042_pm_ops,
1220 },
1221 .probe = max17042_probe,
1222 .id_table = max17042_id,
1223 };
1224 module_i2c_driver(max17042_i2c_driver);
1225
1226 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1227 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1228 MODULE_LICENSE("GPL");
1229