2 * Fuel gauge driver for Maxim 17042 / 8966 / 8997
3 * Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * This driver is based on max17040_battery.c
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>
33 #include <linux/mod_devicetable.h>
34 #include <linux/power_supply.h>
35 #include <linux/power/max17042_battery.h>
37 #include <linux/regmap.h>
39 /* Status register bits */
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)
51 /* Interrupt mask bits */
52 #define CONFIG_ALRT_BIT_ENBL (1 << 2)
53 #define STATUS_INTR_SOCMIN_BIT (1 << 10)
54 #define STATUS_INTR_SOCMAX_BIT (1 << 14)
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
63 #define dQ_ACC_DIV 0x4
64 #define dP_ACC_100 0x1900
65 #define dP_ACC_200 0x3200
67 #define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
69 struct 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;
79 static 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,
106 static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
110 struct regmap *map = chip->regmap;
112 ret = regmap_read(map, MAX17042_TEMP, &data);
116 *temp = sign_extend32(data, 15);
117 /* The value is converted into deci-centigrade scale */
118 /* Units of LSB = 1 / 256 degree Celsius */
119 *temp = *temp * 10 / 256;
123 static int max17042_get_status(struct max17042_chip *chip, int *status)
125 int ret, charge_full, charge_now;
129 ret = power_supply_am_i_supplied(chip->battery);
131 *status = POWER_SUPPLY_STATUS_UNKNOWN;
135 *status = POWER_SUPPLY_STATUS_DISCHARGING;
140 * The MAX170xx has builtin end-of-charge detection and will update
141 * FullCAP to match RepCap when it detects end of charging.
143 * When this cycle the battery gets charged to a higher (calculated)
144 * capacity then the previous cycle then FullCAP will get updated
145 * contineously once end-of-charge detection kicks in, so allow the
149 ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
153 ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
157 if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) {
158 *status = POWER_SUPPLY_STATUS_FULL;
163 * Even though we are supplied, we may still be discharging if the
164 * supply is e.g. only delivering 5V 0.5A. Check current if available.
166 if (!chip->pdata->enable_current_sense) {
167 *status = POWER_SUPPLY_STATUS_CHARGING;
171 ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data);
175 avg_current = sign_extend32(data, 15);
176 avg_current *= 1562500 / chip->pdata->r_sns;
179 *status = POWER_SUPPLY_STATUS_CHARGING;
181 *status = POWER_SUPPLY_STATUS_DISCHARGING;
186 static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
188 int temp, vavg, vbatt, ret;
191 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
195 /* bits [0-3] unused */
196 vavg = val * 625 / 8;
197 /* Convert to millivolts */
200 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
204 /* bits [0-3] unused */
205 vbatt = val * 625 / 8;
206 /* Convert to millivolts */
209 if (vavg < chip->pdata->vmin) {
210 *health = POWER_SUPPLY_HEALTH_DEAD;
214 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
215 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
219 ret = max17042_get_temperature(chip, &temp);
223 if (temp < chip->pdata->temp_min) {
224 *health = POWER_SUPPLY_HEALTH_COLD;
228 if (temp > chip->pdata->temp_max) {
229 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
233 *health = POWER_SUPPLY_HEALTH_GOOD;
242 static int max17042_get_property(struct power_supply *psy,
243 enum power_supply_property psp,
244 union power_supply_propval *val)
246 struct max17042_chip *chip = power_supply_get_drvdata(psy);
247 struct regmap *map = chip->regmap;
252 if (!chip->init_complete)
256 case POWER_SUPPLY_PROP_STATUS:
257 ret = max17042_get_status(chip, &val->intval);
261 case POWER_SUPPLY_PROP_PRESENT:
262 ret = regmap_read(map, MAX17042_STATUS, &data);
266 if (data & MAX17042_STATUS_BattAbsent)
271 case POWER_SUPPLY_PROP_TECHNOLOGY:
272 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
274 case POWER_SUPPLY_PROP_CYCLE_COUNT:
275 ret = regmap_read(map, MAX17042_Cycles, &data);
281 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
282 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
286 val->intval = data >> 8;
287 val->intval *= 20000; /* Units of LSB = 20mV */
289 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
290 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
294 val->intval = (data & 0xff) * 20000; /* Units of 20mV */
296 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
297 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
298 ret = regmap_read(map, MAX17042_V_empty, &data);
300 ret = regmap_read(map, MAX17047_V_empty, &data);
304 val->intval = data >> 7;
305 val->intval *= 10000; /* Units of LSB = 10mV */
307 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
308 ret = regmap_read(map, MAX17042_VCELL, &data);
312 val->intval = data * 625 / 8;
314 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
315 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
319 val->intval = data * 625 / 8;
321 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
322 ret = regmap_read(map, MAX17042_OCVInternal, &data);
326 val->intval = data * 625 / 8;
328 case POWER_SUPPLY_PROP_CAPACITY:
329 if (chip->pdata->enable_current_sense)
330 ret = regmap_read(map, MAX17042_RepSOC, &data);
332 ret = regmap_read(map, MAX17042_VFSOC, &data);
336 val->intval = data >> 8;
338 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
339 ret = regmap_read(map, MAX17042_DesignCap, &data);
343 data64 = data * 5000000ll;
344 do_div(data64, chip->pdata->r_sns);
345 val->intval = data64;
347 case POWER_SUPPLY_PROP_CHARGE_FULL:
348 ret = regmap_read(map, MAX17042_FullCAP, &data);
352 data64 = data * 5000000ll;
353 do_div(data64, chip->pdata->r_sns);
354 val->intval = data64;
356 case POWER_SUPPLY_PROP_CHARGE_NOW:
357 ret = regmap_read(map, MAX17042_RepCap, &data);
361 data64 = data * 5000000ll;
362 do_div(data64, chip->pdata->r_sns);
363 val->intval = data64;
365 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
366 ret = regmap_read(map, MAX17042_QH, &data);
370 val->intval = data * 1000 / 2;
372 case POWER_SUPPLY_PROP_TEMP:
373 ret = max17042_get_temperature(chip, &val->intval);
377 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
378 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
381 /* LSB is Alert Minimum. In deci-centigrade */
382 val->intval = sign_extend32(data & 0xff, 7) * 10;
384 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
385 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
388 /* MSB is Alert Maximum. In deci-centigrade */
389 val->intval = sign_extend32(data >> 8, 7) * 10;
391 case POWER_SUPPLY_PROP_TEMP_MIN:
392 val->intval = chip->pdata->temp_min;
394 case POWER_SUPPLY_PROP_TEMP_MAX:
395 val->intval = chip->pdata->temp_max;
397 case POWER_SUPPLY_PROP_HEALTH:
398 ret = max17042_get_battery_health(chip, &val->intval);
402 case POWER_SUPPLY_PROP_SCOPE:
403 val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
405 case POWER_SUPPLY_PROP_CURRENT_NOW:
406 if (chip->pdata->enable_current_sense) {
407 ret = regmap_read(map, MAX17042_Current, &data);
411 val->intval = sign_extend32(data, 15);
412 val->intval *= 1562500 / chip->pdata->r_sns;
417 case POWER_SUPPLY_PROP_CURRENT_AVG:
418 if (chip->pdata->enable_current_sense) {
419 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
423 val->intval = sign_extend32(data, 15);
424 val->intval *= 1562500 / chip->pdata->r_sns;
435 static int max17042_set_property(struct power_supply *psy,
436 enum power_supply_property psp,
437 const union power_supply_propval *val)
439 struct max17042_chip *chip = power_supply_get_drvdata(psy);
440 struct regmap *map = chip->regmap;
446 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
447 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
451 /* Input in deci-centigrade, convert to centigrade */
452 temp = val->intval / 10;
453 /* force min < max */
454 if (temp >= (int8_t)(data >> 8))
455 temp = (int8_t)(data >> 8) - 1;
456 /* Write both MAX and MIN ALERT */
457 data = (data & 0xff00) + temp;
458 ret = regmap_write(map, MAX17042_TALRT_Th, data);
460 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
461 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
465 /* Input in Deci-Centigrade, convert to centigrade */
466 temp = val->intval / 10;
467 /* force max > min */
468 if (temp <= (int8_t)(data & 0xff))
469 temp = (int8_t)(data & 0xff) + 1;
470 /* Write both MAX and MIN ALERT */
471 data = (data & 0xff) + (temp << 8);
472 ret = regmap_write(map, MAX17042_TALRT_Th, data);
481 static int max17042_property_is_writeable(struct power_supply *psy,
482 enum power_supply_property psp)
487 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
488 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
498 static void max17042_external_power_changed(struct power_supply *psy)
500 power_supply_changed(psy);
503 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
510 ret = regmap_write(map, reg, value);
511 regmap_read(map, reg, &read_value);
512 if (read_value != value) {
516 } while (retries && read_value != value);
519 pr_err("%s: err %d\n", __func__, ret);
524 static inline void max17042_override_por(struct regmap *map,
528 regmap_write(map, reg, value);
531 static inline void max10742_unlock_model(struct max17042_chip *chip)
533 struct regmap *map = chip->regmap;
535 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
536 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
539 static inline void max10742_lock_model(struct max17042_chip *chip)
541 struct regmap *map = chip->regmap;
543 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
544 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
547 static inline void max17042_write_model_data(struct max17042_chip *chip,
550 struct regmap *map = chip->regmap;
553 for (i = 0; i < size; i++)
554 regmap_write(map, addr + i,
555 chip->pdata->config_data->cell_char_tbl[i]);
558 static inline void max17042_read_model_data(struct max17042_chip *chip,
559 u8 addr, u16 *data, int size)
561 struct regmap *map = chip->regmap;
565 for (i = 0; i < size; i++) {
566 regmap_read(map, addr + i, &tmp);
571 static inline int max17042_model_data_compare(struct max17042_chip *chip,
572 u16 *data1, u16 *data2, int size)
576 if (memcmp(data1, data2, size)) {
577 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
578 for (i = 0; i < size; i++)
579 dev_info(&chip->client->dev, "0x%x, 0x%x",
581 dev_info(&chip->client->dev, "\n");
587 static int max17042_init_model(struct max17042_chip *chip)
590 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
593 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
597 max10742_unlock_model(chip);
598 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
600 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
603 ret = max17042_model_data_compare(
605 chip->pdata->config_data->cell_char_tbl,
609 max10742_lock_model(chip);
615 static int max17042_verify_model_lock(struct max17042_chip *chip)
618 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
622 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
626 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
628 for (i = 0; i < table_size; i++)
636 static void max17042_write_config_regs(struct max17042_chip *chip)
638 struct max17042_config_data *config = chip->pdata->config_data;
639 struct regmap *map = chip->regmap;
641 regmap_write(map, MAX17042_CONFIG, config->config);
642 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
643 regmap_write(map, MAX17042_FilterCFG,
645 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
646 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
647 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
648 regmap_write(map, MAX17047_FullSOCThr,
649 config->full_soc_thresh);
652 static void max17042_write_custom_regs(struct max17042_chip *chip)
654 struct max17042_config_data *config = chip->pdata->config_data;
655 struct regmap *map = chip->regmap;
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,
665 max17042_write_verify_reg(map, MAX17047_QRTbl00,
667 max17042_write_verify_reg(map, MAX17047_QRTbl10,
669 max17042_write_verify_reg(map, MAX17047_QRTbl20,
671 max17042_write_verify_reg(map, MAX17047_QRTbl30,
676 static void max17042_update_capacity_regs(struct max17042_chip *chip)
678 struct max17042_config_data *config = chip->pdata->config_data;
679 struct regmap *map = chip->regmap;
681 max17042_write_verify_reg(map, MAX17042_FullCAP,
683 regmap_write(map, MAX17042_DesignCap, config->design_cap);
684 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
688 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
691 struct regmap *map = chip->regmap;
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);
699 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
701 u32 full_cap0, rep_cap, dq_acc, vfSoc;
704 struct max17042_config_data *config = chip->pdata->config_data;
705 struct regmap *map = chip->regmap;
707 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
708 regmap_read(map, MAX17042_VFSOC, &vfSoc);
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
714 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
715 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
718 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
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);
725 max17042_write_verify_reg(map, MAX17042_FullCAP,
727 regmap_write(map, MAX17042_DesignCap,
729 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
731 /* Update SOC register with new SOC */
732 regmap_write(map, MAX17042_RepSOC, vfSoc);
736 * Block write all the override values coming from platform data.
737 * This function MUST be called before the POR initialization proceedure
738 * specified by maxim.
740 static inline void max17042_override_por_values(struct max17042_chip *chip)
742 struct regmap *map = chip->regmap;
743 struct max17042_config_data *config = chip->pdata->config_data;
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);
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);
757 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
758 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
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 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
767 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
768 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
769 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
770 max17042_override_por(map, MAX17042_SOC_empty,
772 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
773 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
774 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
776 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
777 max17042_override_por(map, MAX17042_V_empty, config->vempty);
779 max17042_override_por(map, MAX17047_V_empty, config->vempty);
780 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
781 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
782 max17042_override_por(map, MAX17042_FCTC, config->fctc);
783 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
784 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
785 if (chip->chip_type) {
786 max17042_override_por(map, MAX17042_EmptyTempCo,
787 config->empty_tempco);
788 max17042_override_por(map, MAX17042_K_empty0,
793 static int max17042_init_chip(struct max17042_chip *chip)
795 struct regmap *map = chip->regmap;
798 max17042_override_por_values(chip);
799 /* After Power up, the MAX17042 requires 500mS in order
800 * to perform signal debouncing and initial SOC reporting
804 /* Initialize configaration */
805 max17042_write_config_regs(chip);
807 /* write cell characterization data */
808 ret = max17042_init_model(chip);
810 dev_err(&chip->client->dev, "%s init failed\n",
815 ret = max17042_verify_model_lock(chip);
817 dev_err(&chip->client->dev, "%s lock verify failed\n",
821 /* write custom parameters */
822 max17042_write_custom_regs(chip);
824 /* update capacity params */
825 max17042_update_capacity_regs(chip);
827 /* delay must be atleast 350mS to allow VFSOC
828 * to be calculated from the new configuration
832 /* reset vfsoc0 reg */
833 max17042_reset_vfsoc0_reg(chip);
835 /* load new capacity params */
836 max17042_load_new_capacity_params(chip);
838 /* Init complete, Clear the POR bit */
839 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
843 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
845 struct regmap *map = chip->regmap;
848 /* program interrupt thesholds such that we should
849 * get interrupt for every 'off' perc change in the soc
851 regmap_read(map, MAX17042_RepSOC, &soc);
853 soc_tr = (soc + off) << 8;
856 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
859 static irqreturn_t max17042_thread_handler(int id, void *dev)
861 struct max17042_chip *chip = dev;
865 ret = regmap_read(chip->regmap, MAX17042_STATUS, &val);
869 if ((val & STATUS_INTR_SOCMIN_BIT) ||
870 (val & STATUS_INTR_SOCMAX_BIT)) {
871 dev_info(&chip->client->dev, "SOC threshold INTR\n");
872 max17042_set_soc_threshold(chip, 1);
875 power_supply_changed(chip->battery);
879 static void max17042_init_worker(struct work_struct *work)
881 struct max17042_chip *chip = container_of(work,
882 struct max17042_chip, work);
885 /* Initialize registers according to values from the platform data */
886 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
887 ret = max17042_init_chip(chip);
892 chip->init_complete = 1;
896 static struct max17042_platform_data *
897 max17042_get_of_pdata(struct max17042_chip *chip)
899 struct device *dev = &chip->client->dev;
900 struct device_node *np = dev->of_node;
902 struct max17042_platform_data *pdata;
904 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
909 * Require current sense resistor value to be specified for
910 * current-sense functionality to be enabled at all.
912 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
914 pdata->enable_current_sense = true;
917 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
918 pdata->temp_min = INT_MIN;
919 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
920 pdata->temp_max = INT_MAX;
921 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
922 pdata->vmin = INT_MIN;
923 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
924 pdata->vmax = INT_MAX;
930 static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
932 * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
933 * when the voltage FG reports 95%, as recommended in the datasheet.
935 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
938 static struct max17042_platform_data *
939 max17042_get_default_pdata(struct max17042_chip *chip)
941 struct device *dev = &chip->client->dev;
942 struct max17042_platform_data *pdata;
946 * The MAX17047 gets used on x86 where we might not have pdata, assume
947 * the firmware will already have initialized the fuel-gauge and provide
948 * default values for the non init bits to make things work.
950 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
954 if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
955 pdata->init_data = max17047_default_pdata_init_regs;
956 pdata->num_init_data =
957 ARRAY_SIZE(max17047_default_pdata_init_regs);
960 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
964 /* If bits 0-1 are set to 3 then only Voltage readings are used */
965 if ((misc_cfg & 0x3) == 0x3)
966 pdata->enable_current_sense = false;
968 pdata->enable_current_sense = true;
970 pdata->vmin = MAX17042_DEFAULT_VMIN;
971 pdata->vmax = MAX17042_DEFAULT_VMAX;
972 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
973 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
978 static struct max17042_platform_data *
979 max17042_get_pdata(struct max17042_chip *chip)
981 struct device *dev = &chip->client->dev;
985 return max17042_get_of_pdata(chip);
987 if (dev->platform_data)
988 return dev->platform_data;
990 return max17042_get_default_pdata(chip);
993 static const struct regmap_config max17042_regmap_config = {
996 .val_format_endian = REGMAP_ENDIAN_NATIVE,
999 static const struct power_supply_desc max17042_psy_desc = {
1000 .name = "max170xx_battery",
1001 .type = POWER_SUPPLY_TYPE_BATTERY,
1002 .get_property = max17042_get_property,
1003 .set_property = max17042_set_property,
1004 .property_is_writeable = max17042_property_is_writeable,
1005 .external_power_changed = max17042_external_power_changed,
1006 .properties = max17042_battery_props,
1007 .num_properties = ARRAY_SIZE(max17042_battery_props),
1010 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
1011 .name = "max170xx_battery",
1012 .type = POWER_SUPPLY_TYPE_BATTERY,
1013 .get_property = max17042_get_property,
1014 .set_property = max17042_set_property,
1015 .property_is_writeable = max17042_property_is_writeable,
1016 .properties = max17042_battery_props,
1017 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
1020 static int max17042_probe(struct i2c_client *client,
1021 const struct i2c_device_id *id)
1023 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
1024 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
1025 struct power_supply_config psy_cfg = {};
1026 const struct acpi_device_id *acpi_id = NULL;
1027 struct device *dev = &client->dev;
1028 struct max17042_chip *chip;
1033 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
1036 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1040 chip->client = client;
1042 chip->chip_type = id->driver_data;
1044 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
1048 chip->chip_type = acpi_id->driver_data;
1050 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
1051 if (IS_ERR(chip->regmap)) {
1052 dev_err(&client->dev, "Failed to initialize regmap\n");
1056 chip->pdata = max17042_get_pdata(chip);
1058 dev_err(&client->dev, "no platform data provided\n");
1062 i2c_set_clientdata(client, chip);
1063 psy_cfg.drv_data = chip;
1064 psy_cfg.of_node = dev->of_node;
1066 /* When current is not measured,
1067 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
1068 if (!chip->pdata->enable_current_sense)
1069 max17042_desc = &max17042_no_current_sense_psy_desc;
1071 if (chip->pdata->r_sns == 0)
1072 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1074 if (chip->pdata->init_data)
1075 for (i = 0; i < chip->pdata->num_init_data; i++)
1076 regmap_write(chip->regmap,
1077 chip->pdata->init_data[i].addr,
1078 chip->pdata->init_data[i].data);
1080 if (!chip->pdata->enable_current_sense) {
1081 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1082 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1083 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1086 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1088 if (IS_ERR(chip->battery)) {
1089 dev_err(&client->dev, "failed: power supply register\n");
1090 return PTR_ERR(chip->battery);
1094 unsigned int flags = IRQF_ONESHOT;
1097 * On ACPI systems the IRQ may be handled by ACPI-event code,
1098 * so we need to share (if the ACPI code is willing to share).
1101 flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
1103 ret = devm_request_threaded_irq(&client->dev, client->irq,
1105 max17042_thread_handler, flags,
1106 chip->battery->desc->name,
1109 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1110 CONFIG_ALRT_BIT_ENBL,
1111 CONFIG_ALRT_BIT_ENBL);
1112 max17042_set_soc_threshold(chip, 1);
1116 dev_err(&client->dev, "Failed to get IRQ\n");
1119 /* Not able to update the charge threshold when exceeded? -> disable */
1121 regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
1123 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1124 if (val & STATUS_POR_BIT) {
1125 INIT_WORK(&chip->work, max17042_init_worker);
1126 schedule_work(&chip->work);
1128 chip->init_complete = 1;
1134 #ifdef CONFIG_PM_SLEEP
1135 static int max17042_suspend(struct device *dev)
1137 struct max17042_chip *chip = dev_get_drvdata(dev);
1140 * disable the irq and enable irq_wake
1141 * capability to the interrupt line.
1143 if (chip->client->irq) {
1144 disable_irq(chip->client->irq);
1145 enable_irq_wake(chip->client->irq);
1151 static int max17042_resume(struct device *dev)
1153 struct max17042_chip *chip = dev_get_drvdata(dev);
1155 if (chip->client->irq) {
1156 disable_irq_wake(chip->client->irq);
1157 enable_irq(chip->client->irq);
1158 /* re-program the SOC thresholds to 1% change */
1159 max17042_set_soc_threshold(chip, 1);
1166 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1170 static const struct acpi_device_id max17042_acpi_match[] = {
1171 { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
1174 MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
1178 static const struct of_device_id max17042_dt_match[] = {
1179 { .compatible = "maxim,max17042" },
1180 { .compatible = "maxim,max17047" },
1181 { .compatible = "maxim,max17050" },
1184 MODULE_DEVICE_TABLE(of, max17042_dt_match);
1187 static const struct i2c_device_id max17042_id[] = {
1188 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1189 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1190 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1193 MODULE_DEVICE_TABLE(i2c, max17042_id);
1195 static struct i2c_driver max17042_i2c_driver = {
1198 .acpi_match_table = ACPI_PTR(max17042_acpi_match),
1199 .of_match_table = of_match_ptr(max17042_dt_match),
1200 .pm = &max17042_pm_ops,
1202 .probe = max17042_probe,
1203 .id_table = max17042_id,
1205 module_i2c_driver(max17042_i2c_driver);
1207 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1208 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1209 MODULE_LICENSE("GPL");