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interconnect: qcom: Fix Kconfig indentation
[linux/fpc-iii.git] / drivers / power / supply / max17042_battery.c
blob0dfad2cf13fe025619d2e4a54abd56b860d8c00f
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/init.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/i2c.h>
16 #include <linux/delay.h>
17 #include <linux/interrupt.h>
18 #include <linux/pm.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/power_supply.h>
21 #include <linux/power/max17042_battery.h>
22 #include <linux/of.h>
23 #include <linux/regmap.h>
24
25 /* Status register bits */
26 #define STATUS_POR_BIT (1 << 1)
27 #define STATUS_BST_BIT (1 << 3)
28 #define STATUS_VMN_BIT (1 << 8)
29 #define STATUS_TMN_BIT (1 << 9)
30 #define STATUS_SMN_BIT (1 << 10)
31 #define STATUS_BI_BIT (1 << 11)
32 #define STATUS_VMX_BIT (1 << 12)
33 #define STATUS_TMX_BIT (1 << 13)
34 #define STATUS_SMX_BIT (1 << 14)
35 #define STATUS_BR_BIT (1 << 15)
36
37 /* Interrupt mask bits */
38 #define CONFIG_ALRT_BIT_ENBL (1 << 2)
39 #define STATUS_INTR_SOCMIN_BIT (1 << 10)
40 #define STATUS_INTR_SOCMAX_BIT (1 << 14)
41
42 #define VFSOC0_LOCK 0x0000
43 #define VFSOC0_UNLOCK 0x0080
44 #define MODEL_UNLOCK1 0X0059
45 #define MODEL_UNLOCK2 0X00C4
46 #define MODEL_LOCK1 0X0000
47 #define MODEL_LOCK2 0X0000
48
49 #define dQ_ACC_DIV 0x4
50 #define dP_ACC_100 0x1900
51 #define dP_ACC_200 0x3200
52
53 #define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
54
55 struct max17042_chip {
56 struct i2c_client *client;
57 struct regmap *regmap;
58 struct power_supply *battery;
59 enum max170xx_chip_type chip_type;
60 struct max17042_platform_data *pdata;
61 struct work_struct work;
62 int init_complete;
63 };
64
65 static enum power_supply_property max17042_battery_props[] = {
66 POWER_SUPPLY_PROP_STATUS,
67 POWER_SUPPLY_PROP_PRESENT,
68 POWER_SUPPLY_PROP_TECHNOLOGY,
69 POWER_SUPPLY_PROP_CYCLE_COUNT,
70 POWER_SUPPLY_PROP_VOLTAGE_MAX,
71 POWER_SUPPLY_PROP_VOLTAGE_MIN,
72 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
73 POWER_SUPPLY_PROP_VOLTAGE_NOW,
74 POWER_SUPPLY_PROP_VOLTAGE_AVG,
75 POWER_SUPPLY_PROP_VOLTAGE_OCV,
76 POWER_SUPPLY_PROP_CAPACITY,
77 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
78 POWER_SUPPLY_PROP_CHARGE_FULL,
79 POWER_SUPPLY_PROP_CHARGE_NOW,
80 POWER_SUPPLY_PROP_CHARGE_COUNTER,
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_CURRENT_NOW,
89 POWER_SUPPLY_PROP_CURRENT_AVG,
90 };
91
92 static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
93 {
94 int ret;
95 u32 data;
96 struct regmap *map = chip->regmap;
97
98 ret = regmap_read(map, MAX17042_TEMP, &data);
99 if (ret < 0)
100 return ret;
101
102 *temp = sign_extend32(data, 15);
103 /* The value is converted into deci-centigrade scale */
104 /* Units of LSB = 1 / 256 degree Celsius */
105 *temp = *temp * 10 / 256;
106 return 0;
107 }
108
109 static int max17042_get_status(struct max17042_chip *chip, int *status)
110 {
111 int ret, charge_full, charge_now;
112 int avg_current;
113 u32 data;
114
115 ret = power_supply_am_i_supplied(chip->battery);
116 if (ret < 0) {
117 *status = POWER_SUPPLY_STATUS_UNKNOWN;
118 return 0;
119 }
120 if (ret == 0) {
121 *status = POWER_SUPPLY_STATUS_DISCHARGING;
122 return 0;
123 }
124
125 /*
126 * The MAX170xx has builtin end-of-charge detection and will update
127 * FullCAP to match RepCap when it detects end of charging.
128 *
129 * When this cycle the battery gets charged to a higher (calculated)
130 * capacity then the previous cycle then FullCAP will get updated
131 * contineously once end-of-charge detection kicks in, so allow the
132 * 2 to differ a bit.
133 */
134
135 ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
136 if (ret < 0)
137 return ret;
138
139 ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
140 if (ret < 0)
141 return ret;
142
143 if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) {
144 *status = POWER_SUPPLY_STATUS_FULL;
145 return 0;
146 }
147
148 /*
149 * Even though we are supplied, we may still be discharging if the
150 * supply is e.g. only delivering 5V 0.5A. Check current if available.
151 */
152 if (!chip->pdata->enable_current_sense) {
153 *status = POWER_SUPPLY_STATUS_CHARGING;
154 return 0;
155 }
156
157 ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data);
158 if (ret < 0)
159 return ret;
160
161 avg_current = sign_extend32(data, 15);
162 avg_current *= 1562500 / chip->pdata->r_sns;
163
164 if (avg_current > 0)
165 *status = POWER_SUPPLY_STATUS_CHARGING;
166 else
167 *status = POWER_SUPPLY_STATUS_DISCHARGING;
168
169 return 0;
170 }
171
172 static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
173 {
174 int temp, vavg, vbatt, ret;
175 u32 val;
176
177 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
178 if (ret < 0)
179 goto health_error;
180
181 /* bits [0-3] unused */
182 vavg = val * 625 / 8;
183 /* Convert to millivolts */
184 vavg /= 1000;
185
186 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
187 if (ret < 0)
188 goto health_error;
189
190 /* bits [0-3] unused */
191 vbatt = val * 625 / 8;
192 /* Convert to millivolts */
193 vbatt /= 1000;
194
195 if (vavg < chip->pdata->vmin) {
196 *health = POWER_SUPPLY_HEALTH_DEAD;
197 goto out;
198 }
199
200 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
201 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
202 goto out;
203 }
204
205 ret = max17042_get_temperature(chip, &temp);
206 if (ret < 0)
207 goto health_error;
208
209 if (temp < chip->pdata->temp_min) {
210 *health = POWER_SUPPLY_HEALTH_COLD;
211 goto out;
212 }
213
214 if (temp > chip->pdata->temp_max) {
215 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
216 goto out;
217 }
218
219 *health = POWER_SUPPLY_HEALTH_GOOD;
220
221 out:
222 return 0;
223
224 health_error:
225 return ret;
226 }
227
228 static int max17042_get_property(struct power_supply *psy,
229 enum power_supply_property psp,
230 union power_supply_propval *val)
231 {
232 struct max17042_chip *chip = power_supply_get_drvdata(psy);
233 struct regmap *map = chip->regmap;
234 int ret;
235 u32 data;
236 u64 data64;
237
238 if (!chip->init_complete)
239 return -EAGAIN;
240
241 switch (psp) {
242 case POWER_SUPPLY_PROP_STATUS:
243 ret = max17042_get_status(chip, &val->intval);
244 if (ret < 0)
245 return ret;
246 break;
247 case POWER_SUPPLY_PROP_PRESENT:
248 ret = regmap_read(map, MAX17042_STATUS, &data);
249 if (ret < 0)
250 return ret;
251
252 if (data & MAX17042_STATUS_BattAbsent)
253 val->intval = 0;
254 else
255 val->intval = 1;
256 break;
257 case POWER_SUPPLY_PROP_TECHNOLOGY:
258 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
259 break;
260 case POWER_SUPPLY_PROP_CYCLE_COUNT:
261 ret = regmap_read(map, MAX17042_Cycles, &data);
262 if (ret < 0)
263 return ret;
264
265 val->intval = data;
266 break;
267 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
268 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
269 if (ret < 0)
270 return ret;
271
272 val->intval = data >> 8;
273 val->intval *= 20000; /* Units of LSB = 20mV */
274 break;
275 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
276 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
277 if (ret < 0)
278 return ret;
279
280 val->intval = (data & 0xff) * 20000; /* Units of 20mV */
281 break;
282 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
283 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
284 ret = regmap_read(map, MAX17042_V_empty, &data);
285 else
286 ret = regmap_read(map, MAX17047_V_empty, &data);
287 if (ret < 0)
288 return ret;
289
290 val->intval = data >> 7;
291 val->intval *= 10000; /* Units of LSB = 10mV */
292 break;
293 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
294 ret = regmap_read(map, MAX17042_VCELL, &data);
295 if (ret < 0)
296 return ret;
297
298 val->intval = data * 625 / 8;
299 break;
300 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
301 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
302 if (ret < 0)
303 return ret;
304
305 val->intval = data * 625 / 8;
306 break;
307 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
308 ret = regmap_read(map, MAX17042_OCVInternal, &data);
309 if (ret < 0)
310 return ret;
311
312 val->intval = data * 625 / 8;
313 break;
314 case POWER_SUPPLY_PROP_CAPACITY:
315 ret = regmap_read(map, MAX17042_RepSOC, &data);
316 if (ret < 0)
317 return ret;
318
319 val->intval = data >> 8;
320 break;
321 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
322 ret = regmap_read(map, MAX17042_DesignCap, &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_FULL:
331 ret = regmap_read(map, MAX17042_FullCAP, &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_NOW:
340 ret = regmap_read(map, MAX17042_RepCap, &data);
341 if (ret < 0)
342 return ret;
343
344 data64 = data * 5000000ll;
345 do_div(data64, chip->pdata->r_sns);
346 val->intval = data64;
347 break;
348 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
349 ret = regmap_read(map, MAX17042_QH, &data);
350 if (ret < 0)
351 return ret;
352
353 val->intval = data * 1000 / 2;
354 break;
355 case POWER_SUPPLY_PROP_TEMP:
356 ret = max17042_get_temperature(chip, &val->intval);
357 if (ret < 0)
358 return ret;
359 break;
360 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
361 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
362 if (ret < 0)
363 return ret;
364 /* LSB is Alert Minimum. In deci-centigrade */
365 val->intval = sign_extend32(data & 0xff, 7) * 10;
366 break;
367 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
368 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
369 if (ret < 0)
370 return ret;
371 /* MSB is Alert Maximum. In deci-centigrade */
372 val->intval = sign_extend32(data >> 8, 7) * 10;
373 break;
374 case POWER_SUPPLY_PROP_TEMP_MIN:
375 val->intval = chip->pdata->temp_min;
376 break;
377 case POWER_SUPPLY_PROP_TEMP_MAX:
378 val->intval = chip->pdata->temp_max;
379 break;
380 case POWER_SUPPLY_PROP_HEALTH:
381 ret = max17042_get_battery_health(chip, &val->intval);
382 if (ret < 0)
383 return ret;
384 break;
385 case POWER_SUPPLY_PROP_SCOPE:
386 val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
387 break;
388 case POWER_SUPPLY_PROP_CURRENT_NOW:
389 if (chip->pdata->enable_current_sense) {
390 ret = regmap_read(map, MAX17042_Current, &data);
391 if (ret < 0)
392 return ret;
393
394 val->intval = sign_extend32(data, 15);
395 val->intval *= 1562500 / chip->pdata->r_sns;
396 } else {
397 return -EINVAL;
398 }
399 break;
400 case POWER_SUPPLY_PROP_CURRENT_AVG:
401 if (chip->pdata->enable_current_sense) {
402 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
403 if (ret < 0)
404 return ret;
405
406 val->intval = sign_extend32(data, 15);
407 val->intval *= 1562500 / chip->pdata->r_sns;
408 } else {
409 return -EINVAL;
410 }
411 break;
412 default:
413 return -EINVAL;
414 }
415 return 0;
416 }
417
418 static int max17042_set_property(struct power_supply *psy,
419 enum power_supply_property psp,
420 const union power_supply_propval *val)
421 {
422 struct max17042_chip *chip = power_supply_get_drvdata(psy);
423 struct regmap *map = chip->regmap;
424 int ret = 0;
425 u32 data;
426 int8_t temp;
427
428 switch (psp) {
429 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
430 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
431 if (ret < 0)
432 return ret;
433
434 /* Input in deci-centigrade, convert to centigrade */
435 temp = val->intval / 10;
436 /* force min < max */
437 if (temp >= (int8_t)(data >> 8))
438 temp = (int8_t)(data >> 8) - 1;
439 /* Write both MAX and MIN ALERT */
440 data = (data & 0xff00) + temp;
441 ret = regmap_write(map, MAX17042_TALRT_Th, data);
442 break;
443 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
444 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
445 if (ret < 0)
446 return ret;
447
448 /* Input in Deci-Centigrade, convert to centigrade */
449 temp = val->intval / 10;
450 /* force max > min */
451 if (temp <= (int8_t)(data & 0xff))
452 temp = (int8_t)(data & 0xff) + 1;
453 /* Write both MAX and MIN ALERT */
454 data = (data & 0xff) + (temp << 8);
455 ret = regmap_write(map, MAX17042_TALRT_Th, data);
456 break;
457 default:
458 ret = -EINVAL;
459 }
460
461 return ret;
462 }
463
464 static int max17042_property_is_writeable(struct power_supply *psy,
465 enum power_supply_property psp)
466 {
467 int ret;
468
469 switch (psp) {
470 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
471 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
472 ret = 1;
473 break;
474 default:
475 ret = 0;
476 }
477
478 return ret;
479 }
480
481 static void max17042_external_power_changed(struct power_supply *psy)
482 {
483 power_supply_changed(psy);
484 }
485
486 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
487 {
488 int retries = 8;
489 int ret;
490 u32 read_value;
491
492 do {
493 ret = regmap_write(map, reg, value);
494 regmap_read(map, reg, &read_value);
495 if (read_value != value) {
496 ret = -EIO;
497 retries--;
498 }
499 } while (retries && read_value != value);
500
501 if (ret < 0)
502 pr_err("%s: err %d\n", __func__, ret);
503
504 return ret;
505 }
506
507 static inline void max17042_override_por(struct regmap *map,
508 u8 reg, u16 value)
509 {
510 if (value)
511 regmap_write(map, reg, value);
512 }
513
514 static inline void max17042_unlock_model(struct max17042_chip *chip)
515 {
516 struct regmap *map = chip->regmap;
517
518 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
519 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
520 }
521
522 static inline void max17042_lock_model(struct max17042_chip *chip)
523 {
524 struct regmap *map = chip->regmap;
525
526 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
527 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
528 }
529
530 static inline void max17042_write_model_data(struct max17042_chip *chip,
531 u8 addr, int size)
532 {
533 struct regmap *map = chip->regmap;
534 int i;
535
536 for (i = 0; i < size; i++)
537 regmap_write(map, addr + i,
538 chip->pdata->config_data->cell_char_tbl[i]);
539 }
540
541 static inline void max17042_read_model_data(struct max17042_chip *chip,
542 u8 addr, u16 *data, int size)
543 {
544 struct regmap *map = chip->regmap;
545 int i;
546 u32 tmp;
547
548 for (i = 0; i < size; i++) {
549 regmap_read(map, addr + i, &tmp);
550 data[i] = (u16)tmp;
551 }
552 }
553
554 static inline int max17042_model_data_compare(struct max17042_chip *chip,
555 u16 *data1, u16 *data2, int size)
556 {
557 int i;
558
559 if (memcmp(data1, data2, size)) {
560 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
561 for (i = 0; i < size; i++)
562 dev_info(&chip->client->dev, "0x%x, 0x%x",
563 data1[i], data2[i]);
564 dev_info(&chip->client->dev, "\n");
565 return -EINVAL;
566 }
567 return 0;
568 }
569
570 static int max17042_init_model(struct max17042_chip *chip)
571 {
572 int ret;
573 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
574 u16 *temp_data;
575
576 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
577 if (!temp_data)
578 return -ENOMEM;
579
580 max17042_unlock_model(chip);
581 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
582 table_size);
583 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
584 table_size);
585
586 ret = max17042_model_data_compare(
587 chip,
588 chip->pdata->config_data->cell_char_tbl,
589 temp_data,
590 table_size);
591
592 max17042_lock_model(chip);
593 kfree(temp_data);
594
595 return ret;
596 }
597
598 static int max17042_verify_model_lock(struct max17042_chip *chip)
599 {
600 int i;
601 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
602 u16 *temp_data;
603 int ret = 0;
604
605 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
606 if (!temp_data)
607 return -ENOMEM;
608
609 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
610 table_size);
611 for (i = 0; i < table_size; i++)
612 if (temp_data[i])
613 ret = -EINVAL;
614
615 kfree(temp_data);
616 return ret;
617 }
618
619 static void max17042_write_config_regs(struct max17042_chip *chip)
620 {
621 struct max17042_config_data *config = chip->pdata->config_data;
622 struct regmap *map = chip->regmap;
623
624 regmap_write(map, MAX17042_CONFIG, config->config);
625 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
626 regmap_write(map, MAX17042_FilterCFG,
627 config->filter_cfg);
628 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
629 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
630 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
631 regmap_write(map, MAX17047_FullSOCThr,
632 config->full_soc_thresh);
633 }
634
635 static void max17042_write_custom_regs(struct max17042_chip *chip)
636 {
637 struct max17042_config_data *config = chip->pdata->config_data;
638 struct regmap *map = chip->regmap;
639
640 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
641 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
642 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
643 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
644 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
645 max17042_write_verify_reg(map, MAX17042_K_empty0,
646 config->kempty0);
647 } else {
648 max17042_write_verify_reg(map, MAX17047_QRTbl00,
649 config->qrtbl00);
650 max17042_write_verify_reg(map, MAX17047_QRTbl10,
651 config->qrtbl10);
652 max17042_write_verify_reg(map, MAX17047_QRTbl20,
653 config->qrtbl20);
654 max17042_write_verify_reg(map, MAX17047_QRTbl30,
655 config->qrtbl30);
656 }
657 }
658
659 static void max17042_update_capacity_regs(struct max17042_chip *chip)
660 {
661 struct max17042_config_data *config = chip->pdata->config_data;
662 struct regmap *map = chip->regmap;
663
664 max17042_write_verify_reg(map, MAX17042_FullCAP,
665 config->fullcap);
666 regmap_write(map, MAX17042_DesignCap, config->design_cap);
667 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
668 config->fullcapnom);
669 }
670
671 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
672 {
673 unsigned int vfSoc;
674 struct regmap *map = chip->regmap;
675
676 regmap_read(map, MAX17042_VFSOC, &vfSoc);
677 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
678 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
679 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
680 }
681
682 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
683 {
684 u32 full_cap0, rep_cap, dq_acc, vfSoc;
685 u32 rem_cap;
686
687 struct max17042_config_data *config = chip->pdata->config_data;
688 struct regmap *map = chip->regmap;
689
690 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
691 regmap_read(map, MAX17042_VFSOC, &vfSoc);
692
693 /* fg_vfSoc needs to shifted by 8 bits to get the
694 * perc in 1% accuracy, to get the right rem_cap multiply
695 * full_cap0, fg_vfSoc and devide by 100
696 */
697 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
698 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
699
700 rep_cap = rem_cap;
701 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
702
703 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
704 dq_acc = config->fullcap / dQ_ACC_DIV;
705 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
706 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
707
708 max17042_write_verify_reg(map, MAX17042_FullCAP,
709 config->fullcap);
710 regmap_write(map, MAX17042_DesignCap,
711 config->design_cap);
712 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
713 config->fullcapnom);
714 /* Update SOC register with new SOC */
715 regmap_write(map, MAX17042_RepSOC, vfSoc);
716 }
717
718 /*
719 * Block write all the override values coming from platform data.
720 * This function MUST be called before the POR initialization proceedure
721 * specified by maxim.
722 */
723 static inline void max17042_override_por_values(struct max17042_chip *chip)
724 {
725 struct regmap *map = chip->regmap;
726 struct max17042_config_data *config = chip->pdata->config_data;
727
728 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
729 max17042_override_por(map, MAx17042_TOFF, config->toff);
730 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
731 max17042_override_por(map, MAX17042_COFF, config->coff);
732
733 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
734 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
735 max17042_override_por(map, MAX17042_SALRT_Th,
736 config->soc_alrt_thresh);
737 max17042_override_por(map, MAX17042_CONFIG, config->config);
738 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
739
740 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
741 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
742
743 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
744 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
745 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
746 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
747 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
748 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
749
750 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
751 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
752 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
753 max17042_override_por(map, MAX17042_SOC_empty,
754 config->socempty);
755 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
756 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
757 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
758
759 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
760 max17042_override_por(map, MAX17042_V_empty, config->vempty);
761 else
762 max17042_override_por(map, MAX17047_V_empty, config->vempty);
763 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
764 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
765 max17042_override_por(map, MAX17042_FCTC, config->fctc);
766 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
767 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
768 if (chip->chip_type) {
769 max17042_override_por(map, MAX17042_EmptyTempCo,
770 config->empty_tempco);
771 max17042_override_por(map, MAX17042_K_empty0,
772 config->kempty0);
773 }
774 }
775
776 static int max17042_init_chip(struct max17042_chip *chip)
777 {
778 struct regmap *map = chip->regmap;
779 int ret;
780
781 max17042_override_por_values(chip);
782 /* After Power up, the MAX17042 requires 500mS in order
783 * to perform signal debouncing and initial SOC reporting
784 */
785 msleep(500);
786
787 /* Initialize configaration */
788 max17042_write_config_regs(chip);
789
790 /* write cell characterization data */
791 ret = max17042_init_model(chip);
792 if (ret) {
793 dev_err(&chip->client->dev, "%s init failed\n",
794 __func__);
795 return -EIO;
796 }
797
798 ret = max17042_verify_model_lock(chip);
799 if (ret) {
800 dev_err(&chip->client->dev, "%s lock verify failed\n",
801 __func__);
802 return -EIO;
803 }
804 /* write custom parameters */
805 max17042_write_custom_regs(chip);
806
807 /* update capacity params */
808 max17042_update_capacity_regs(chip);
809
810 /* delay must be atleast 350mS to allow VFSOC
811 * to be calculated from the new configuration
812 */
813 msleep(350);
814
815 /* reset vfsoc0 reg */
816 max17042_reset_vfsoc0_reg(chip);
817
818 /* load new capacity params */
819 max17042_load_new_capacity_params(chip);
820
821 /* Init complete, Clear the POR bit */
822 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
823 return 0;
824 }
825
826 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
827 {
828 struct regmap *map = chip->regmap;
829 u32 soc, soc_tr;
830
831 /* program interrupt thesholds such that we should
832 * get interrupt for every 'off' perc change in the soc
833 */
834 regmap_read(map, MAX17042_RepSOC, &soc);
835 soc >>= 8;
836 soc_tr = (soc + off) << 8;
837 soc_tr |= (soc - off);
838 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
839 }
840
841 static irqreturn_t max17042_thread_handler(int id, void *dev)
842 {
843 struct max17042_chip *chip = dev;
844 u32 val;
845
846 regmap_read(chip->regmap, MAX17042_STATUS, &val);
847 if ((val & STATUS_INTR_SOCMIN_BIT) ||
848 (val & STATUS_INTR_SOCMAX_BIT)) {
849 dev_info(&chip->client->dev, "SOC threshold INTR\n");
850 max17042_set_soc_threshold(chip, 1);
851 }
852
853 power_supply_changed(chip->battery);
854 return IRQ_HANDLED;
855 }
856
857 static void max17042_init_worker(struct work_struct *work)
858 {
859 struct max17042_chip *chip = container_of(work,
860 struct max17042_chip, work);
861 int ret;
862
863 /* Initialize registers according to values from the platform data */
864 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
865 ret = max17042_init_chip(chip);
866 if (ret)
867 return;
868 }
869
870 chip->init_complete = 1;
871 }
872
873 #ifdef CONFIG_OF
874 static struct max17042_platform_data *
875 max17042_get_of_pdata(struct max17042_chip *chip)
876 {
877 struct device *dev = &chip->client->dev;
878 struct device_node *np = dev->of_node;
879 u32 prop;
880 struct max17042_platform_data *pdata;
881
882 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
883 if (!pdata)
884 return NULL;
885
886 /*
887 * Require current sense resistor value to be specified for
888 * current-sense functionality to be enabled at all.
889 */
890 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
891 pdata->r_sns = prop;
892 pdata->enable_current_sense = true;
893 }
894
895 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
896 pdata->temp_min = INT_MIN;
897 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
898 pdata->temp_max = INT_MAX;
899 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
900 pdata->vmin = INT_MIN;
901 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
902 pdata->vmax = INT_MAX;
903
904 return pdata;
905 }
906 #endif
907
908 static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
909 /*
910 * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
911 * when the voltage FG reports 95%, as recommended in the datasheet.
912 */
913 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
914 };
915
916 static struct max17042_platform_data *
917 max17042_get_default_pdata(struct max17042_chip *chip)
918 {
919 struct device *dev = &chip->client->dev;
920 struct max17042_platform_data *pdata;
921 int ret, misc_cfg;
922
923 /*
924 * The MAX17047 gets used on x86 where we might not have pdata, assume
925 * the firmware will already have initialized the fuel-gauge and provide
926 * default values for the non init bits to make things work.
927 */
928 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
929 if (!pdata)
930 return pdata;
931
932 if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
933 pdata->init_data = max17047_default_pdata_init_regs;
934 pdata->num_init_data =
935 ARRAY_SIZE(max17047_default_pdata_init_regs);
936 }
937
938 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
939 if (ret < 0)
940 return NULL;
941
942 /* If bits 0-1 are set to 3 then only Voltage readings are used */
943 if ((misc_cfg & 0x3) == 0x3)
944 pdata->enable_current_sense = false;
945 else
946 pdata->enable_current_sense = true;
947
948 pdata->vmin = MAX17042_DEFAULT_VMIN;
949 pdata->vmax = MAX17042_DEFAULT_VMAX;
950 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
951 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
952
953 return pdata;
954 }
955
956 static struct max17042_platform_data *
957 max17042_get_pdata(struct max17042_chip *chip)
958 {
959 struct device *dev = &chip->client->dev;
960
961 #ifdef CONFIG_OF
962 if (dev->of_node)
963 return max17042_get_of_pdata(chip);
964 #endif
965 if (dev->platform_data)
966 return dev->platform_data;
967
968 return max17042_get_default_pdata(chip);
969 }
970
971 static const struct regmap_config max17042_regmap_config = {
972 .reg_bits = 8,
973 .val_bits = 16,
974 .val_format_endian = REGMAP_ENDIAN_NATIVE,
975 };
976
977 static const struct power_supply_desc max17042_psy_desc = {
978 .name = "max170xx_battery",
979 .type = POWER_SUPPLY_TYPE_BATTERY,
980 .get_property = max17042_get_property,
981 .set_property = max17042_set_property,
982 .property_is_writeable = max17042_property_is_writeable,
983 .external_power_changed = max17042_external_power_changed,
984 .properties = max17042_battery_props,
985 .num_properties = ARRAY_SIZE(max17042_battery_props),
986 };
987
988 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
989 .name = "max170xx_battery",
990 .type = POWER_SUPPLY_TYPE_BATTERY,
991 .get_property = max17042_get_property,
992 .set_property = max17042_set_property,
993 .property_is_writeable = max17042_property_is_writeable,
994 .properties = max17042_battery_props,
995 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
996 };
997
998 static void max17042_stop_work(void *data)
999 {
1000 struct max17042_chip *chip = data;
1001
1002 cancel_work_sync(&chip->work);
1003 }
1004
1005 static int max17042_probe(struct i2c_client *client,
1006 const struct i2c_device_id *id)
1007 {
1008 struct i2c_adapter *adapter = client->adapter;
1009 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
1010 struct power_supply_config psy_cfg = {};
1011 const struct acpi_device_id *acpi_id = NULL;
1012 struct device *dev = &client->dev;
1013 struct max17042_chip *chip;
1014 int ret;
1015 int i;
1016 u32 val;
1017
1018 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
1019 return -EIO;
1020
1021 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1022 if (!chip)
1023 return -ENOMEM;
1024
1025 chip->client = client;
1026 if (id) {
1027 chip->chip_type = id->driver_data;
1028 } else {
1029 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
1030 if (!acpi_id)
1031 return -ENODEV;
1032
1033 chip->chip_type = acpi_id->driver_data;
1034 }
1035 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
1036 if (IS_ERR(chip->regmap)) {
1037 dev_err(&client->dev, "Failed to initialize regmap\n");
1038 return -EINVAL;
1039 }
1040
1041 chip->pdata = max17042_get_pdata(chip);
1042 if (!chip->pdata) {
1043 dev_err(&client->dev, "no platform data provided\n");
1044 return -EINVAL;
1045 }
1046
1047 i2c_set_clientdata(client, chip);
1048 psy_cfg.drv_data = chip;
1049 psy_cfg.of_node = dev->of_node;
1050
1051 /* When current is not measured,
1052 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
1053 if (!chip->pdata->enable_current_sense)
1054 max17042_desc = &max17042_no_current_sense_psy_desc;
1055
1056 if (chip->pdata->r_sns == 0)
1057 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1058
1059 if (chip->pdata->init_data)
1060 for (i = 0; i < chip->pdata->num_init_data; i++)
1061 regmap_write(chip->regmap,
1062 chip->pdata->init_data[i].addr,
1063 chip->pdata->init_data[i].data);
1064
1065 if (!chip->pdata->enable_current_sense) {
1066 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1067 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1068 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1069 }
1070
1071 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1072 &psy_cfg);
1073 if (IS_ERR(chip->battery)) {
1074 dev_err(&client->dev, "failed: power supply register\n");
1075 return PTR_ERR(chip->battery);
1076 }
1077
1078 if (client->irq) {
1079 unsigned int flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
1080
1081 /*
1082 * On ACPI systems the IRQ may be handled by ACPI-event code,
1083 * so we need to share (if the ACPI code is willing to share).
1084 */
1085 if (acpi_id)
1086 flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
1087
1088 ret = devm_request_threaded_irq(&client->dev, client->irq,
1089 NULL,
1090 max17042_thread_handler, flags,
1091 chip->battery->desc->name,
1092 chip);
1093 if (!ret) {
1094 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1095 CONFIG_ALRT_BIT_ENBL,
1096 CONFIG_ALRT_BIT_ENBL);
1097 max17042_set_soc_threshold(chip, 1);
1098 } else {
1099 client->irq = 0;
1100 if (ret != -EBUSY)
1101 dev_err(&client->dev, "Failed to get IRQ\n");
1102 }
1103 }
1104 /* Not able to update the charge threshold when exceeded? -> disable */
1105 if (!client->irq)
1106 regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
1107
1108 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1109 if (val & STATUS_POR_BIT) {
1110 INIT_WORK(&chip->work, max17042_init_worker);
1111 ret = devm_add_action(&client->dev, max17042_stop_work, chip);
1112 if (ret)
1113 return ret;
1114 schedule_work(&chip->work);
1115 } else {
1116 chip->init_complete = 1;
1117 }
1118
1119 return 0;
1120 }
1121
1122 #ifdef CONFIG_PM_SLEEP
1123 static int max17042_suspend(struct device *dev)
1124 {
1125 struct max17042_chip *chip = dev_get_drvdata(dev);
1126
1127 /*
1128 * disable the irq and enable irq_wake
1129 * capability to the interrupt line.
1130 */
1131 if (chip->client->irq) {
1132 disable_irq(chip->client->irq);
1133 enable_irq_wake(chip->client->irq);
1134 }
1135
1136 return 0;
1137 }
1138
1139 static int max17042_resume(struct device *dev)
1140 {
1141 struct max17042_chip *chip = dev_get_drvdata(dev);
1142
1143 if (chip->client->irq) {
1144 disable_irq_wake(chip->client->irq);
1145 enable_irq(chip->client->irq);
1146 /* re-program the SOC thresholds to 1% change */
1147 max17042_set_soc_threshold(chip, 1);
1148 }
1149
1150 return 0;
1151 }
1152 #endif
1153
1154 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1155 max17042_resume);
1156
1157 #ifdef CONFIG_ACPI
1158 static const struct acpi_device_id max17042_acpi_match[] = {
1159 { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
1160 { }
1161 };
1162 MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
1163 #endif
1164
1165 #ifdef CONFIG_OF
1166 static const struct of_device_id max17042_dt_match[] = {
1167 { .compatible = "maxim,max17042" },
1168 { .compatible = "maxim,max17047" },
1169 { .compatible = "maxim,max17050" },
1170 { },
1171 };
1172 MODULE_DEVICE_TABLE(of, max17042_dt_match);
1173 #endif
1174
1175 static const struct i2c_device_id max17042_id[] = {
1176 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1177 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1178 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1179 { }
1180 };
1181 MODULE_DEVICE_TABLE(i2c, max17042_id);
1182
1183 static struct i2c_driver max17042_i2c_driver = {
1184 .driver = {
1185 .name = "max17042",
1186 .acpi_match_table = ACPI_PTR(max17042_acpi_match),
1187 .of_match_table = of_match_ptr(max17042_dt_match),
1188 .pm = &max17042_pm_ops,
1189 },
1190 .probe = max17042_probe,
1191 .id_table = max17042_id,
1192 };
1193 module_i2c_driver(max17042_i2c_driver);
1194
1195 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1196 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1197 MODULE_LICENSE("GPL");
Linux with added FPC-III support