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/init.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/i2c.h>
29 #include <linux/delay.h>
30 #include <linux/interrupt.h>
32 #include <linux/mod_devicetable.h>
33 #include <linux/power_supply.h>
34 #include <linux/power/max17042_battery.h>
36 #include <linux/regmap.h>
38 /* Status register bits */
39 #define STATUS_POR_BIT (1 << 1)
40 #define STATUS_BST_BIT (1 << 3)
41 #define STATUS_VMN_BIT (1 << 8)
42 #define STATUS_TMN_BIT (1 << 9)
43 #define STATUS_SMN_BIT (1 << 10)
44 #define STATUS_BI_BIT (1 << 11)
45 #define STATUS_VMX_BIT (1 << 12)
46 #define STATUS_TMX_BIT (1 << 13)
47 #define STATUS_SMX_BIT (1 << 14)
48 #define STATUS_BR_BIT (1 << 15)
50 /* Interrupt mask bits */
51 #define CONFIG_ALRT_BIT_ENBL (1 << 2)
52 #define STATUS_INTR_SOCMIN_BIT (1 << 10)
53 #define STATUS_INTR_SOCMAX_BIT (1 << 14)
55 #define VFSOC0_LOCK 0x0000
56 #define VFSOC0_UNLOCK 0x0080
57 #define MODEL_UNLOCK1 0X0059
58 #define MODEL_UNLOCK2 0X00C4
59 #define MODEL_LOCK1 0X0000
60 #define MODEL_LOCK2 0X0000
62 #define dQ_ACC_DIV 0x4
63 #define dP_ACC_100 0x1900
64 #define dP_ACC_200 0x3200
66 #define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
68 struct max17042_chip {
69 struct i2c_client *client;
70 struct regmap *regmap;
71 struct power_supply *battery;
72 enum max170xx_chip_type chip_type;
73 struct max17042_platform_data *pdata;
74 struct work_struct work;
78 static enum power_supply_property max17042_battery_props[] = {
79 POWER_SUPPLY_PROP_STATUS,
80 POWER_SUPPLY_PROP_PRESENT,
81 POWER_SUPPLY_PROP_TECHNOLOGY,
82 POWER_SUPPLY_PROP_CYCLE_COUNT,
83 POWER_SUPPLY_PROP_VOLTAGE_MAX,
84 POWER_SUPPLY_PROP_VOLTAGE_MIN,
85 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
86 POWER_SUPPLY_PROP_VOLTAGE_NOW,
87 POWER_SUPPLY_PROP_VOLTAGE_AVG,
88 POWER_SUPPLY_PROP_VOLTAGE_OCV,
89 POWER_SUPPLY_PROP_CAPACITY,
90 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
91 POWER_SUPPLY_PROP_CHARGE_FULL,
92 POWER_SUPPLY_PROP_CHARGE_NOW,
93 POWER_SUPPLY_PROP_CHARGE_COUNTER,
94 POWER_SUPPLY_PROP_TEMP,
95 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
96 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
97 POWER_SUPPLY_PROP_TEMP_MIN,
98 POWER_SUPPLY_PROP_TEMP_MAX,
99 POWER_SUPPLY_PROP_HEALTH,
100 POWER_SUPPLY_PROP_CURRENT_NOW,
101 POWER_SUPPLY_PROP_CURRENT_AVG,
104 static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
108 struct regmap *map = chip->regmap;
110 ret = regmap_read(map, MAX17042_TEMP, &data);
114 *temp = sign_extend32(data, 15);
115 /* The value is converted into deci-centigrade scale */
116 /* Units of LSB = 1 / 256 degree Celsius */
117 *temp = *temp * 10 / 256;
121 static int max17042_get_status(struct max17042_chip *chip, int *status)
123 int ret, charge_full, charge_now;
125 ret = power_supply_am_i_supplied(chip->battery);
127 *status = POWER_SUPPLY_STATUS_UNKNOWN;
131 *status = POWER_SUPPLY_STATUS_DISCHARGING;
136 * The MAX170xx has builtin end-of-charge detection and will update
137 * FullCAP to match RepCap when it detects end of charging.
139 * When this cycle the battery gets charged to a higher (calculated)
140 * capacity then the previous cycle then FullCAP will get updated
141 * contineously once end-of-charge detection kicks in, so allow the
145 ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
149 ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
153 if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD)
154 *status = POWER_SUPPLY_STATUS_FULL;
156 *status = POWER_SUPPLY_STATUS_CHARGING;
161 static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
163 int temp, vavg, vbatt, ret;
166 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
170 /* bits [0-3] unused */
171 vavg = val * 625 / 8;
172 /* Convert to millivolts */
175 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
179 /* bits [0-3] unused */
180 vbatt = val * 625 / 8;
181 /* Convert to millivolts */
184 if (vavg < chip->pdata->vmin) {
185 *health = POWER_SUPPLY_HEALTH_DEAD;
189 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
190 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
194 ret = max17042_get_temperature(chip, &temp);
198 if (temp < chip->pdata->temp_min) {
199 *health = POWER_SUPPLY_HEALTH_COLD;
203 if (temp > chip->pdata->temp_max) {
204 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
208 *health = POWER_SUPPLY_HEALTH_GOOD;
217 static int max17042_get_property(struct power_supply *psy,
218 enum power_supply_property psp,
219 union power_supply_propval *val)
221 struct max17042_chip *chip = power_supply_get_drvdata(psy);
222 struct regmap *map = chip->regmap;
227 if (!chip->init_complete)
231 case POWER_SUPPLY_PROP_STATUS:
232 ret = max17042_get_status(chip, &val->intval);
236 case POWER_SUPPLY_PROP_PRESENT:
237 ret = regmap_read(map, MAX17042_STATUS, &data);
241 if (data & MAX17042_STATUS_BattAbsent)
246 case POWER_SUPPLY_PROP_TECHNOLOGY:
247 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
249 case POWER_SUPPLY_PROP_CYCLE_COUNT:
250 ret = regmap_read(map, MAX17042_Cycles, &data);
256 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
257 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
261 val->intval = data >> 8;
262 val->intval *= 20000; /* Units of LSB = 20mV */
264 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
265 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
269 val->intval = (data & 0xff) * 20000; /* Units of 20mV */
271 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
272 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
273 ret = regmap_read(map, MAX17042_V_empty, &data);
275 ret = regmap_read(map, MAX17047_V_empty, &data);
279 val->intval = data >> 7;
280 val->intval *= 10000; /* Units of LSB = 10mV */
282 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
283 ret = regmap_read(map, MAX17042_VCELL, &data);
287 val->intval = data * 625 / 8;
289 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
290 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
294 val->intval = data * 625 / 8;
296 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
297 ret = regmap_read(map, MAX17042_OCVInternal, &data);
301 val->intval = data * 625 / 8;
303 case POWER_SUPPLY_PROP_CAPACITY:
304 ret = regmap_read(map, MAX17042_RepSOC, &data);
308 val->intval = data >> 8;
310 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
311 ret = regmap_read(map, MAX17042_DesignCap, &data);
315 data64 = data * 5000000ll;
316 do_div(data64, chip->pdata->r_sns);
317 val->intval = data64;
319 case POWER_SUPPLY_PROP_CHARGE_FULL:
320 ret = regmap_read(map, MAX17042_FullCAP, &data);
324 data64 = data * 5000000ll;
325 do_div(data64, chip->pdata->r_sns);
326 val->intval = data64;
328 case POWER_SUPPLY_PROP_CHARGE_NOW:
329 ret = regmap_read(map, MAX17042_RepCap, &data);
333 data64 = data * 5000000ll;
334 do_div(data64, chip->pdata->r_sns);
335 val->intval = data64;
337 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
338 ret = regmap_read(map, MAX17042_QH, &data);
342 val->intval = data * 1000 / 2;
344 case POWER_SUPPLY_PROP_TEMP:
345 ret = max17042_get_temperature(chip, &val->intval);
349 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
350 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
353 /* LSB is Alert Minimum. In deci-centigrade */
354 val->intval = sign_extend32(data & 0xff, 7) * 10;
356 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
357 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
360 /* MSB is Alert Maximum. In deci-centigrade */
361 val->intval = sign_extend32(data >> 8, 7) * 10;
363 case POWER_SUPPLY_PROP_TEMP_MIN:
364 val->intval = chip->pdata->temp_min;
366 case POWER_SUPPLY_PROP_TEMP_MAX:
367 val->intval = chip->pdata->temp_max;
369 case POWER_SUPPLY_PROP_HEALTH:
370 ret = max17042_get_battery_health(chip, &val->intval);
374 case POWER_SUPPLY_PROP_CURRENT_NOW:
375 if (chip->pdata->enable_current_sense) {
376 ret = regmap_read(map, MAX17042_Current, &data);
380 val->intval = sign_extend32(data, 15);
381 val->intval *= 1562500 / chip->pdata->r_sns;
386 case POWER_SUPPLY_PROP_CURRENT_AVG:
387 if (chip->pdata->enable_current_sense) {
388 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
392 val->intval = sign_extend32(data, 15);
393 val->intval *= 1562500 / chip->pdata->r_sns;
404 static int max17042_set_property(struct power_supply *psy,
405 enum power_supply_property psp,
406 const union power_supply_propval *val)
408 struct max17042_chip *chip = power_supply_get_drvdata(psy);
409 struct regmap *map = chip->regmap;
415 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
416 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
420 /* Input in deci-centigrade, convert to centigrade */
421 temp = val->intval / 10;
422 /* force min < max */
423 if (temp >= (int8_t)(data >> 8))
424 temp = (int8_t)(data >> 8) - 1;
425 /* Write both MAX and MIN ALERT */
426 data = (data & 0xff00) + temp;
427 ret = regmap_write(map, MAX17042_TALRT_Th, data);
429 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
430 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
434 /* Input in Deci-Centigrade, convert to centigrade */
435 temp = val->intval / 10;
436 /* force max > min */
437 if (temp <= (int8_t)(data & 0xff))
438 temp = (int8_t)(data & 0xff) + 1;
439 /* Write both MAX and MIN ALERT */
440 data = (data & 0xff) + (temp << 8);
441 ret = regmap_write(map, MAX17042_TALRT_Th, data);
450 static int max17042_property_is_writeable(struct power_supply *psy,
451 enum power_supply_property psp)
456 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
457 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
467 static void max17042_external_power_changed(struct power_supply *psy)
469 power_supply_changed(psy);
472 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
479 ret = regmap_write(map, reg, value);
480 regmap_read(map, reg, &read_value);
481 if (read_value != value) {
485 } while (retries && read_value != value);
488 pr_err("%s: err %d\n", __func__, ret);
493 static inline void max17042_override_por(struct regmap *map,
497 regmap_write(map, reg, value);
500 static inline void max10742_unlock_model(struct max17042_chip *chip)
502 struct regmap *map = chip->regmap;
504 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
505 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
508 static inline void max10742_lock_model(struct max17042_chip *chip)
510 struct regmap *map = chip->regmap;
512 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
513 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
516 static inline void max17042_write_model_data(struct max17042_chip *chip,
519 struct regmap *map = chip->regmap;
522 for (i = 0; i < size; i++)
523 regmap_write(map, addr + i,
524 chip->pdata->config_data->cell_char_tbl[i]);
527 static inline void max17042_read_model_data(struct max17042_chip *chip,
528 u8 addr, u16 *data, int size)
530 struct regmap *map = chip->regmap;
534 for (i = 0; i < size; i++) {
535 regmap_read(map, addr + i, &tmp);
540 static inline int max17042_model_data_compare(struct max17042_chip *chip,
541 u16 *data1, u16 *data2, int size)
545 if (memcmp(data1, data2, size)) {
546 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
547 for (i = 0; i < size; i++)
548 dev_info(&chip->client->dev, "0x%x, 0x%x",
550 dev_info(&chip->client->dev, "\n");
556 static int max17042_init_model(struct max17042_chip *chip)
559 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
562 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
566 max10742_unlock_model(chip);
567 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
569 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
572 ret = max17042_model_data_compare(
574 chip->pdata->config_data->cell_char_tbl,
578 max10742_lock_model(chip);
584 static int max17042_verify_model_lock(struct max17042_chip *chip)
587 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
591 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
595 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
597 for (i = 0; i < table_size; i++)
605 static void max17042_write_config_regs(struct max17042_chip *chip)
607 struct max17042_config_data *config = chip->pdata->config_data;
608 struct regmap *map = chip->regmap;
610 regmap_write(map, MAX17042_CONFIG, config->config);
611 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
612 regmap_write(map, MAX17042_FilterCFG,
614 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
615 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
616 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
617 regmap_write(map, MAX17047_FullSOCThr,
618 config->full_soc_thresh);
621 static void max17042_write_custom_regs(struct max17042_chip *chip)
623 struct max17042_config_data *config = chip->pdata->config_data;
624 struct regmap *map = chip->regmap;
626 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
627 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
628 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
629 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
630 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
631 max17042_write_verify_reg(map, MAX17042_K_empty0,
634 max17042_write_verify_reg(map, MAX17047_QRTbl00,
636 max17042_write_verify_reg(map, MAX17047_QRTbl10,
638 max17042_write_verify_reg(map, MAX17047_QRTbl20,
640 max17042_write_verify_reg(map, MAX17047_QRTbl30,
645 static void max17042_update_capacity_regs(struct max17042_chip *chip)
647 struct max17042_config_data *config = chip->pdata->config_data;
648 struct regmap *map = chip->regmap;
650 max17042_write_verify_reg(map, MAX17042_FullCAP,
652 regmap_write(map, MAX17042_DesignCap, config->design_cap);
653 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
657 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
660 struct regmap *map = chip->regmap;
662 regmap_read(map, MAX17042_VFSOC, &vfSoc);
663 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
664 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
665 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
668 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
670 u32 full_cap0, rep_cap, dq_acc, vfSoc;
673 struct max17042_config_data *config = chip->pdata->config_data;
674 struct regmap *map = chip->regmap;
676 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
677 regmap_read(map, MAX17042_VFSOC, &vfSoc);
679 /* fg_vfSoc needs to shifted by 8 bits to get the
680 * perc in 1% accuracy, to get the right rem_cap multiply
681 * full_cap0, fg_vfSoc and devide by 100
683 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
684 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
687 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
689 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
690 dq_acc = config->fullcap / dQ_ACC_DIV;
691 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
692 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
694 max17042_write_verify_reg(map, MAX17042_FullCAP,
696 regmap_write(map, MAX17042_DesignCap,
698 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
700 /* Update SOC register with new SOC */
701 regmap_write(map, MAX17042_RepSOC, vfSoc);
705 * Block write all the override values coming from platform data.
706 * This function MUST be called before the POR initialization proceedure
707 * specified by maxim.
709 static inline void max17042_override_por_values(struct max17042_chip *chip)
711 struct regmap *map = chip->regmap;
712 struct max17042_config_data *config = chip->pdata->config_data;
714 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
715 max17042_override_por(map, MAx17042_TOFF, config->toff);
716 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
717 max17042_override_por(map, MAX17042_COFF, config->coff);
719 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
720 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
721 max17042_override_por(map, MAX17042_SALRT_Th,
722 config->soc_alrt_thresh);
723 max17042_override_por(map, MAX17042_CONFIG, config->config);
724 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
726 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
727 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
729 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
730 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
731 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
732 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
733 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
734 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
736 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
737 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
738 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
739 max17042_override_por(map, MAX17042_SOC_empty,
741 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
742 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
743 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
745 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
746 max17042_override_por(map, MAX17042_V_empty, config->vempty);
748 max17042_override_por(map, MAX17047_V_empty, config->vempty);
749 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
750 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
751 max17042_override_por(map, MAX17042_FCTC, config->fctc);
752 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
753 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
754 if (chip->chip_type) {
755 max17042_override_por(map, MAX17042_EmptyTempCo,
756 config->empty_tempco);
757 max17042_override_por(map, MAX17042_K_empty0,
762 static int max17042_init_chip(struct max17042_chip *chip)
764 struct regmap *map = chip->regmap;
767 max17042_override_por_values(chip);
768 /* After Power up, the MAX17042 requires 500mS in order
769 * to perform signal debouncing and initial SOC reporting
773 /* Initialize configaration */
774 max17042_write_config_regs(chip);
776 /* write cell characterization data */
777 ret = max17042_init_model(chip);
779 dev_err(&chip->client->dev, "%s init failed\n",
784 ret = max17042_verify_model_lock(chip);
786 dev_err(&chip->client->dev, "%s lock verify failed\n",
790 /* write custom parameters */
791 max17042_write_custom_regs(chip);
793 /* update capacity params */
794 max17042_update_capacity_regs(chip);
796 /* delay must be atleast 350mS to allow VFSOC
797 * to be calculated from the new configuration
801 /* reset vfsoc0 reg */
802 max17042_reset_vfsoc0_reg(chip);
804 /* load new capacity params */
805 max17042_load_new_capacity_params(chip);
807 /* Init complete, Clear the POR bit */
808 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
812 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
814 struct regmap *map = chip->regmap;
817 /* program interrupt thesholds such that we should
818 * get interrupt for every 'off' perc change in the soc
820 regmap_read(map, MAX17042_RepSOC, &soc);
822 soc_tr = (soc + off) << 8;
823 soc_tr |= (soc - off);
824 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
827 static irqreturn_t max17042_thread_handler(int id, void *dev)
829 struct max17042_chip *chip = dev;
832 regmap_read(chip->regmap, MAX17042_STATUS, &val);
833 if ((val & STATUS_INTR_SOCMIN_BIT) ||
834 (val & STATUS_INTR_SOCMAX_BIT)) {
835 dev_info(&chip->client->dev, "SOC threshold INTR\n");
836 max17042_set_soc_threshold(chip, 1);
839 power_supply_changed(chip->battery);
843 static void max17042_init_worker(struct work_struct *work)
845 struct max17042_chip *chip = container_of(work,
846 struct max17042_chip, work);
849 /* Initialize registers according to values from the platform data */
850 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
851 ret = max17042_init_chip(chip);
856 chip->init_complete = 1;
860 static struct max17042_platform_data *
861 max17042_get_pdata(struct max17042_chip *chip)
863 struct device *dev = &chip->client->dev;
864 struct device_node *np = dev->of_node;
866 struct max17042_platform_data *pdata;
869 return dev->platform_data;
871 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
876 * Require current sense resistor value to be specified for
877 * current-sense functionality to be enabled at all.
879 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
881 pdata->enable_current_sense = true;
884 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
885 pdata->temp_min = INT_MIN;
886 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
887 pdata->temp_max = INT_MAX;
888 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
889 pdata->vmin = INT_MIN;
890 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
891 pdata->vmax = INT_MAX;
896 static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
898 * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
899 * when the voltage FG reports 95%, as recommended in the datasheet.
901 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
904 static struct max17042_platform_data *
905 max17042_get_pdata(struct max17042_chip *chip)
907 struct device *dev = &chip->client->dev;
908 struct max17042_platform_data *pdata;
911 if (dev->platform_data)
912 return dev->platform_data;
915 * The MAX17047 gets used on x86 where we might not have pdata, assume
916 * the firmware will already have initialized the fuel-gauge and provide
917 * default values for the non init bits to make things work.
919 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
923 if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
924 pdata->init_data = max17047_default_pdata_init_regs;
925 pdata->num_init_data =
926 ARRAY_SIZE(max17047_default_pdata_init_regs);
929 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
933 /* If bits 0-1 are set to 3 then only Voltage readings are used */
934 if ((misc_cfg & 0x3) == 0x3)
935 pdata->enable_current_sense = false;
937 pdata->enable_current_sense = true;
939 pdata->vmin = MAX17042_DEFAULT_VMIN;
940 pdata->vmax = MAX17042_DEFAULT_VMAX;
941 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
942 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
948 static const struct regmap_config max17042_regmap_config = {
951 .val_format_endian = REGMAP_ENDIAN_NATIVE,
954 static const struct power_supply_desc max17042_psy_desc = {
955 .name = "max170xx_battery",
956 .type = POWER_SUPPLY_TYPE_BATTERY,
957 .get_property = max17042_get_property,
958 .set_property = max17042_set_property,
959 .property_is_writeable = max17042_property_is_writeable,
960 .external_power_changed = max17042_external_power_changed,
961 .properties = max17042_battery_props,
962 .num_properties = ARRAY_SIZE(max17042_battery_props),
965 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
966 .name = "max170xx_battery",
967 .type = POWER_SUPPLY_TYPE_BATTERY,
968 .get_property = max17042_get_property,
969 .set_property = max17042_set_property,
970 .property_is_writeable = max17042_property_is_writeable,
971 .properties = max17042_battery_props,
972 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
975 static int max17042_probe(struct i2c_client *client,
976 const struct i2c_device_id *id)
978 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
979 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
980 struct power_supply_config psy_cfg = {};
981 struct max17042_chip *chip;
986 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
989 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
993 chip->client = client;
994 chip->chip_type = id->driver_data;
995 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
996 if (IS_ERR(chip->regmap)) {
997 dev_err(&client->dev, "Failed to initialize regmap\n");
1001 chip->pdata = max17042_get_pdata(chip);
1003 dev_err(&client->dev, "no platform data provided\n");
1007 i2c_set_clientdata(client, chip);
1008 psy_cfg.drv_data = chip;
1010 /* When current is not measured,
1011 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
1012 if (!chip->pdata->enable_current_sense)
1013 max17042_desc = &max17042_no_current_sense_psy_desc;
1015 if (chip->pdata->r_sns == 0)
1016 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1018 if (chip->pdata->init_data)
1019 for (i = 0; i < chip->pdata->num_init_data; i++)
1020 regmap_write(chip->regmap,
1021 chip->pdata->init_data[i].addr,
1022 chip->pdata->init_data[i].data);
1024 if (!chip->pdata->enable_current_sense) {
1025 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1026 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1027 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1030 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1032 if (IS_ERR(chip->battery)) {
1033 dev_err(&client->dev, "failed: power supply register\n");
1034 return PTR_ERR(chip->battery);
1038 ret = devm_request_threaded_irq(&client->dev, client->irq,
1040 max17042_thread_handler,
1041 IRQF_TRIGGER_FALLING |
1043 chip->battery->desc->name,
1046 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1047 CONFIG_ALRT_BIT_ENBL,
1048 CONFIG_ALRT_BIT_ENBL);
1049 max17042_set_soc_threshold(chip, 1);
1052 dev_err(&client->dev, "%s(): cannot get IRQ\n",
1057 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1058 if (val & STATUS_POR_BIT) {
1059 INIT_WORK(&chip->work, max17042_init_worker);
1060 schedule_work(&chip->work);
1062 chip->init_complete = 1;
1068 #ifdef CONFIG_PM_SLEEP
1069 static int max17042_suspend(struct device *dev)
1071 struct max17042_chip *chip = dev_get_drvdata(dev);
1074 * disable the irq and enable irq_wake
1075 * capability to the interrupt line.
1077 if (chip->client->irq) {
1078 disable_irq(chip->client->irq);
1079 enable_irq_wake(chip->client->irq);
1085 static int max17042_resume(struct device *dev)
1087 struct max17042_chip *chip = dev_get_drvdata(dev);
1089 if (chip->client->irq) {
1090 disable_irq_wake(chip->client->irq);
1091 enable_irq(chip->client->irq);
1092 /* re-program the SOC thresholds to 1% change */
1093 max17042_set_soc_threshold(chip, 1);
1100 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1104 static const struct of_device_id max17042_dt_match[] = {
1105 { .compatible = "maxim,max17042" },
1106 { .compatible = "maxim,max17047" },
1107 { .compatible = "maxim,max17050" },
1110 MODULE_DEVICE_TABLE(of, max17042_dt_match);
1113 static const struct i2c_device_id max17042_id[] = {
1114 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1115 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1116 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1119 MODULE_DEVICE_TABLE(i2c, max17042_id);
1121 static struct i2c_driver max17042_i2c_driver = {
1124 .of_match_table = of_match_ptr(max17042_dt_match),
1125 .pm = &max17042_pm_ops,
1127 .probe = max17042_probe,
1128 .id_table = max17042_id,
1130 module_i2c_driver(max17042_i2c_driver);
1132 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1133 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1134 MODULE_LICENSE("GPL");