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_CYCLE_COUNT,
82 POWER_SUPPLY_PROP_VOLTAGE_MAX,
83 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
84 POWER_SUPPLY_PROP_VOLTAGE_NOW,
85 POWER_SUPPLY_PROP_VOLTAGE_AVG,
86 POWER_SUPPLY_PROP_VOLTAGE_OCV,
87 POWER_SUPPLY_PROP_CAPACITY,
88 POWER_SUPPLY_PROP_CHARGE_FULL,
89 POWER_SUPPLY_PROP_CHARGE_COUNTER,
90 POWER_SUPPLY_PROP_TEMP,
91 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
92 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
93 POWER_SUPPLY_PROP_TEMP_MIN,
94 POWER_SUPPLY_PROP_TEMP_MAX,
95 POWER_SUPPLY_PROP_HEALTH,
96 POWER_SUPPLY_PROP_CURRENT_NOW,
97 POWER_SUPPLY_PROP_CURRENT_AVG,
100 static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
104 struct regmap *map = chip->regmap;
106 ret = regmap_read(map, MAX17042_TEMP, &data);
110 *temp = sign_extend32(data, 15);
111 /* The value is converted into deci-centigrade scale */
112 /* Units of LSB = 1 / 256 degree Celsius */
113 *temp = *temp * 10 / 256;
117 static int max17042_get_status(struct max17042_chip *chip, int *status)
119 int ret, charge_full, charge_now;
121 ret = power_supply_am_i_supplied(chip->battery);
123 *status = POWER_SUPPLY_STATUS_UNKNOWN;
127 *status = POWER_SUPPLY_STATUS_DISCHARGING;
132 * The MAX170xx has builtin end-of-charge detection and will update
133 * FullCAP to match RepCap when it detects end of charging.
135 * When this cycle the battery gets charged to a higher (calculated)
136 * capacity then the previous cycle then FullCAP will get updated
137 * contineously once end-of-charge detection kicks in, so allow the
141 ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
145 ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
149 if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD)
150 *status = POWER_SUPPLY_STATUS_FULL;
152 *status = POWER_SUPPLY_STATUS_CHARGING;
157 static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
159 int temp, vavg, vbatt, ret;
162 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
166 /* bits [0-3] unused */
167 vavg = val * 625 / 8;
168 /* Convert to millivolts */
171 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
175 /* bits [0-3] unused */
176 vbatt = val * 625 / 8;
177 /* Convert to millivolts */
180 if (vavg < chip->pdata->vmin) {
181 *health = POWER_SUPPLY_HEALTH_DEAD;
185 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
186 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
190 ret = max17042_get_temperature(chip, &temp);
194 if (temp < chip->pdata->temp_min) {
195 *health = POWER_SUPPLY_HEALTH_COLD;
199 if (temp > chip->pdata->temp_max) {
200 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
204 *health = POWER_SUPPLY_HEALTH_GOOD;
213 static int max17042_get_property(struct power_supply *psy,
214 enum power_supply_property psp,
215 union power_supply_propval *val)
217 struct max17042_chip *chip = power_supply_get_drvdata(psy);
218 struct regmap *map = chip->regmap;
222 if (!chip->init_complete)
226 case POWER_SUPPLY_PROP_STATUS:
227 ret = max17042_get_status(chip, &val->intval);
231 case POWER_SUPPLY_PROP_PRESENT:
232 ret = regmap_read(map, MAX17042_STATUS, &data);
236 if (data & MAX17042_STATUS_BattAbsent)
241 case POWER_SUPPLY_PROP_CYCLE_COUNT:
242 ret = regmap_read(map, MAX17042_Cycles, &data);
248 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
249 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
253 val->intval = data >> 8;
254 val->intval *= 20000; /* Units of LSB = 20mV */
256 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
257 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
258 ret = regmap_read(map, MAX17042_V_empty, &data);
260 ret = regmap_read(map, MAX17047_V_empty, &data);
264 val->intval = data >> 7;
265 val->intval *= 10000; /* Units of LSB = 10mV */
267 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
268 ret = regmap_read(map, MAX17042_VCELL, &data);
272 val->intval = data * 625 / 8;
274 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
275 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
279 val->intval = data * 625 / 8;
281 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
282 ret = regmap_read(map, MAX17042_OCVInternal, &data);
286 val->intval = data * 625 / 8;
288 case POWER_SUPPLY_PROP_CAPACITY:
289 ret = regmap_read(map, MAX17042_RepSOC, &data);
293 val->intval = data >> 8;
295 case POWER_SUPPLY_PROP_CHARGE_FULL:
296 ret = regmap_read(map, MAX17042_FullCAP, &data);
300 val->intval = data * 1000 / 2;
302 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
303 ret = regmap_read(map, MAX17042_QH, &data);
307 val->intval = data * 1000 / 2;
309 case POWER_SUPPLY_PROP_TEMP:
310 ret = max17042_get_temperature(chip, &val->intval);
314 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
315 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
318 /* LSB is Alert Minimum. In deci-centigrade */
319 val->intval = sign_extend32(data & 0xff, 7) * 10;
321 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
322 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
325 /* MSB is Alert Maximum. In deci-centigrade */
326 val->intval = sign_extend32(data >> 8, 7) * 10;
328 case POWER_SUPPLY_PROP_TEMP_MIN:
329 val->intval = chip->pdata->temp_min;
331 case POWER_SUPPLY_PROP_TEMP_MAX:
332 val->intval = chip->pdata->temp_max;
334 case POWER_SUPPLY_PROP_HEALTH:
335 ret = max17042_get_battery_health(chip, &val->intval);
339 case POWER_SUPPLY_PROP_CURRENT_NOW:
340 if (chip->pdata->enable_current_sense) {
341 ret = regmap_read(map, MAX17042_Current, &data);
345 val->intval = sign_extend32(data, 15);
346 val->intval *= 1562500 / chip->pdata->r_sns;
351 case POWER_SUPPLY_PROP_CURRENT_AVG:
352 if (chip->pdata->enable_current_sense) {
353 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
357 val->intval = sign_extend32(data, 15);
358 val->intval *= 1562500 / chip->pdata->r_sns;
369 static int max17042_set_property(struct power_supply *psy,
370 enum power_supply_property psp,
371 const union power_supply_propval *val)
373 struct max17042_chip *chip = power_supply_get_drvdata(psy);
374 struct regmap *map = chip->regmap;
380 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
381 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
385 /* Input in deci-centigrade, convert to centigrade */
386 temp = val->intval / 10;
387 /* force min < max */
388 if (temp >= (int8_t)(data >> 8))
389 temp = (int8_t)(data >> 8) - 1;
390 /* Write both MAX and MIN ALERT */
391 data = (data & 0xff00) + temp;
392 ret = regmap_write(map, MAX17042_TALRT_Th, data);
394 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
395 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
399 /* Input in Deci-Centigrade, convert to centigrade */
400 temp = val->intval / 10;
401 /* force max > min */
402 if (temp <= (int8_t)(data & 0xff))
403 temp = (int8_t)(data & 0xff) + 1;
404 /* Write both MAX and MIN ALERT */
405 data = (data & 0xff) + (temp << 8);
406 ret = regmap_write(map, MAX17042_TALRT_Th, data);
415 static int max17042_property_is_writeable(struct power_supply *psy,
416 enum power_supply_property psp)
421 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
422 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
432 static void max17042_external_power_changed(struct power_supply *psy)
434 power_supply_changed(psy);
437 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
444 ret = regmap_write(map, reg, value);
445 regmap_read(map, reg, &read_value);
446 if (read_value != value) {
450 } while (retries && read_value != value);
453 pr_err("%s: err %d\n", __func__, ret);
458 static inline void max17042_override_por(struct regmap *map,
462 regmap_write(map, reg, value);
465 static inline void max10742_unlock_model(struct max17042_chip *chip)
467 struct regmap *map = chip->regmap;
469 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
470 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
473 static inline void max10742_lock_model(struct max17042_chip *chip)
475 struct regmap *map = chip->regmap;
477 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
478 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
481 static inline void max17042_write_model_data(struct max17042_chip *chip,
484 struct regmap *map = chip->regmap;
487 for (i = 0; i < size; i++)
488 regmap_write(map, addr + i,
489 chip->pdata->config_data->cell_char_tbl[i]);
492 static inline void max17042_read_model_data(struct max17042_chip *chip,
493 u8 addr, u16 *data, int size)
495 struct regmap *map = chip->regmap;
499 for (i = 0; i < size; i++) {
500 regmap_read(map, addr + i, &tmp);
505 static inline int max17042_model_data_compare(struct max17042_chip *chip,
506 u16 *data1, u16 *data2, int size)
510 if (memcmp(data1, data2, size)) {
511 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
512 for (i = 0; i < size; i++)
513 dev_info(&chip->client->dev, "0x%x, 0x%x",
515 dev_info(&chip->client->dev, "\n");
521 static int max17042_init_model(struct max17042_chip *chip)
524 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
527 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
531 max10742_unlock_model(chip);
532 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
534 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
537 ret = max17042_model_data_compare(
539 chip->pdata->config_data->cell_char_tbl,
543 max10742_lock_model(chip);
549 static int max17042_verify_model_lock(struct max17042_chip *chip)
552 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
556 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
560 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
562 for (i = 0; i < table_size; i++)
570 static void max17042_write_config_regs(struct max17042_chip *chip)
572 struct max17042_config_data *config = chip->pdata->config_data;
573 struct regmap *map = chip->regmap;
575 regmap_write(map, MAX17042_CONFIG, config->config);
576 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
577 regmap_write(map, MAX17042_FilterCFG,
579 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
580 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
581 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
582 regmap_write(map, MAX17047_FullSOCThr,
583 config->full_soc_thresh);
586 static void max17042_write_custom_regs(struct max17042_chip *chip)
588 struct max17042_config_data *config = chip->pdata->config_data;
589 struct regmap *map = chip->regmap;
591 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
592 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
593 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
594 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
595 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
596 max17042_write_verify_reg(map, MAX17042_K_empty0,
599 max17042_write_verify_reg(map, MAX17047_QRTbl00,
601 max17042_write_verify_reg(map, MAX17047_QRTbl10,
603 max17042_write_verify_reg(map, MAX17047_QRTbl20,
605 max17042_write_verify_reg(map, MAX17047_QRTbl30,
610 static void max17042_update_capacity_regs(struct max17042_chip *chip)
612 struct max17042_config_data *config = chip->pdata->config_data;
613 struct regmap *map = chip->regmap;
615 max17042_write_verify_reg(map, MAX17042_FullCAP,
617 regmap_write(map, MAX17042_DesignCap, config->design_cap);
618 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
622 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
625 struct regmap *map = chip->regmap;
627 regmap_read(map, MAX17042_VFSOC, &vfSoc);
628 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
629 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
630 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
633 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
635 u32 full_cap0, rep_cap, dq_acc, vfSoc;
638 struct max17042_config_data *config = chip->pdata->config_data;
639 struct regmap *map = chip->regmap;
641 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
642 regmap_read(map, MAX17042_VFSOC, &vfSoc);
644 /* fg_vfSoc needs to shifted by 8 bits to get the
645 * perc in 1% accuracy, to get the right rem_cap multiply
646 * full_cap0, fg_vfSoc and devide by 100
648 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
649 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
652 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
654 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
655 dq_acc = config->fullcap / dQ_ACC_DIV;
656 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
657 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
659 max17042_write_verify_reg(map, MAX17042_FullCAP,
661 regmap_write(map, MAX17042_DesignCap,
663 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
665 /* Update SOC register with new SOC */
666 regmap_write(map, MAX17042_RepSOC, vfSoc);
670 * Block write all the override values coming from platform data.
671 * This function MUST be called before the POR initialization proceedure
672 * specified by maxim.
674 static inline void max17042_override_por_values(struct max17042_chip *chip)
676 struct regmap *map = chip->regmap;
677 struct max17042_config_data *config = chip->pdata->config_data;
679 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
680 max17042_override_por(map, MAx17042_TOFF, config->toff);
681 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
682 max17042_override_por(map, MAX17042_COFF, config->coff);
684 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
685 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
686 max17042_override_por(map, MAX17042_SALRT_Th,
687 config->soc_alrt_thresh);
688 max17042_override_por(map, MAX17042_CONFIG, config->config);
689 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
691 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
692 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
694 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
695 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
696 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
697 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
698 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
699 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
701 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
702 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
703 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
704 max17042_override_por(map, MAX17042_SOC_empty,
706 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
707 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
708 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
710 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
711 max17042_override_por(map, MAX17042_V_empty, config->vempty);
713 max17042_override_por(map, MAX17047_V_empty, config->vempty);
714 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
715 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
716 max17042_override_por(map, MAX17042_FCTC, config->fctc);
717 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
718 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
719 if (chip->chip_type) {
720 max17042_override_por(map, MAX17042_EmptyTempCo,
721 config->empty_tempco);
722 max17042_override_por(map, MAX17042_K_empty0,
727 static int max17042_init_chip(struct max17042_chip *chip)
729 struct regmap *map = chip->regmap;
732 max17042_override_por_values(chip);
733 /* After Power up, the MAX17042 requires 500mS in order
734 * to perform signal debouncing and initial SOC reporting
738 /* Initialize configaration */
739 max17042_write_config_regs(chip);
741 /* write cell characterization data */
742 ret = max17042_init_model(chip);
744 dev_err(&chip->client->dev, "%s init failed\n",
749 ret = max17042_verify_model_lock(chip);
751 dev_err(&chip->client->dev, "%s lock verify failed\n",
755 /* write custom parameters */
756 max17042_write_custom_regs(chip);
758 /* update capacity params */
759 max17042_update_capacity_regs(chip);
761 /* delay must be atleast 350mS to allow VFSOC
762 * to be calculated from the new configuration
766 /* reset vfsoc0 reg */
767 max17042_reset_vfsoc0_reg(chip);
769 /* load new capacity params */
770 max17042_load_new_capacity_params(chip);
772 /* Init complete, Clear the POR bit */
773 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
777 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
779 struct regmap *map = chip->regmap;
782 /* program interrupt thesholds such that we should
783 * get interrupt for every 'off' perc change in the soc
785 regmap_read(map, MAX17042_RepSOC, &soc);
787 soc_tr = (soc + off) << 8;
788 soc_tr |= (soc - off);
789 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
792 static irqreturn_t max17042_thread_handler(int id, void *dev)
794 struct max17042_chip *chip = dev;
797 regmap_read(chip->regmap, MAX17042_STATUS, &val);
798 if ((val & STATUS_INTR_SOCMIN_BIT) ||
799 (val & STATUS_INTR_SOCMAX_BIT)) {
800 dev_info(&chip->client->dev, "SOC threshold INTR\n");
801 max17042_set_soc_threshold(chip, 1);
804 power_supply_changed(chip->battery);
808 static void max17042_init_worker(struct work_struct *work)
810 struct max17042_chip *chip = container_of(work,
811 struct max17042_chip, work);
814 /* Initialize registers according to values from the platform data */
815 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
816 ret = max17042_init_chip(chip);
821 chip->init_complete = 1;
825 static struct max17042_platform_data *
826 max17042_get_pdata(struct max17042_chip *chip)
828 struct device *dev = &chip->client->dev;
829 struct device_node *np = dev->of_node;
831 struct max17042_platform_data *pdata;
834 return dev->platform_data;
836 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
841 * Require current sense resistor value to be specified for
842 * current-sense functionality to be enabled at all.
844 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
846 pdata->enable_current_sense = true;
849 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
850 pdata->temp_min = INT_MIN;
851 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
852 pdata->temp_max = INT_MAX;
853 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
854 pdata->vmin = INT_MIN;
855 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
856 pdata->vmax = INT_MAX;
861 static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
863 * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
864 * when the voltage FG reports 95%, as recommended in the datasheet.
866 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
869 static struct max17042_platform_data *
870 max17042_get_pdata(struct max17042_chip *chip)
872 struct device *dev = &chip->client->dev;
873 struct max17042_platform_data *pdata;
876 if (dev->platform_data)
877 return dev->platform_data;
880 * The MAX17047 gets used on x86 where we might not have pdata, assume
881 * the firmware will already have initialized the fuel-gauge and provide
882 * default values for the non init bits to make things work.
884 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
888 if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
889 pdata->init_data = max17047_default_pdata_init_regs;
890 pdata->num_init_data =
891 ARRAY_SIZE(max17047_default_pdata_init_regs);
894 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
898 /* If bits 0-1 are set to 3 then only Voltage readings are used */
899 if ((misc_cfg & 0x3) == 0x3)
900 pdata->enable_current_sense = false;
902 pdata->enable_current_sense = true;
904 pdata->vmin = MAX17042_DEFAULT_VMIN;
905 pdata->vmax = MAX17042_DEFAULT_VMAX;
906 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
907 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
913 static const struct regmap_config max17042_regmap_config = {
916 .val_format_endian = REGMAP_ENDIAN_NATIVE,
919 static const struct power_supply_desc max17042_psy_desc = {
920 .name = "max170xx_battery",
921 .type = POWER_SUPPLY_TYPE_BATTERY,
922 .get_property = max17042_get_property,
923 .set_property = max17042_set_property,
924 .property_is_writeable = max17042_property_is_writeable,
925 .external_power_changed = max17042_external_power_changed,
926 .properties = max17042_battery_props,
927 .num_properties = ARRAY_SIZE(max17042_battery_props),
930 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
931 .name = "max170xx_battery",
932 .type = POWER_SUPPLY_TYPE_BATTERY,
933 .get_property = max17042_get_property,
934 .set_property = max17042_set_property,
935 .property_is_writeable = max17042_property_is_writeable,
936 .properties = max17042_battery_props,
937 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
940 static int max17042_probe(struct i2c_client *client,
941 const struct i2c_device_id *id)
943 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
944 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
945 struct power_supply_config psy_cfg = {};
946 struct max17042_chip *chip;
951 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
954 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
958 chip->client = client;
959 chip->chip_type = id->driver_data;
960 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
961 if (IS_ERR(chip->regmap)) {
962 dev_err(&client->dev, "Failed to initialize regmap\n");
966 chip->pdata = max17042_get_pdata(chip);
968 dev_err(&client->dev, "no platform data provided\n");
972 i2c_set_clientdata(client, chip);
973 psy_cfg.drv_data = chip;
975 /* When current is not measured,
976 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
977 if (!chip->pdata->enable_current_sense)
978 max17042_desc = &max17042_no_current_sense_psy_desc;
980 if (chip->pdata->r_sns == 0)
981 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
983 if (chip->pdata->init_data)
984 for (i = 0; i < chip->pdata->num_init_data; i++)
985 regmap_write(chip->regmap,
986 chip->pdata->init_data[i].addr,
987 chip->pdata->init_data[i].data);
989 if (!chip->pdata->enable_current_sense) {
990 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
991 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
992 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
995 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
997 if (IS_ERR(chip->battery)) {
998 dev_err(&client->dev, "failed: power supply register\n");
999 return PTR_ERR(chip->battery);
1003 ret = devm_request_threaded_irq(&client->dev, client->irq,
1005 max17042_thread_handler,
1006 IRQF_TRIGGER_FALLING |
1008 chip->battery->desc->name,
1011 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1012 CONFIG_ALRT_BIT_ENBL,
1013 CONFIG_ALRT_BIT_ENBL);
1014 max17042_set_soc_threshold(chip, 1);
1017 dev_err(&client->dev, "%s(): cannot get IRQ\n",
1022 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1023 if (val & STATUS_POR_BIT) {
1024 INIT_WORK(&chip->work, max17042_init_worker);
1025 schedule_work(&chip->work);
1027 chip->init_complete = 1;
1033 #ifdef CONFIG_PM_SLEEP
1034 static int max17042_suspend(struct device *dev)
1036 struct max17042_chip *chip = dev_get_drvdata(dev);
1039 * disable the irq and enable irq_wake
1040 * capability to the interrupt line.
1042 if (chip->client->irq) {
1043 disable_irq(chip->client->irq);
1044 enable_irq_wake(chip->client->irq);
1050 static int max17042_resume(struct device *dev)
1052 struct max17042_chip *chip = dev_get_drvdata(dev);
1054 if (chip->client->irq) {
1055 disable_irq_wake(chip->client->irq);
1056 enable_irq(chip->client->irq);
1057 /* re-program the SOC thresholds to 1% change */
1058 max17042_set_soc_threshold(chip, 1);
1065 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1069 static const struct of_device_id max17042_dt_match[] = {
1070 { .compatible = "maxim,max17042" },
1071 { .compatible = "maxim,max17047" },
1072 { .compatible = "maxim,max17050" },
1075 MODULE_DEVICE_TABLE(of, max17042_dt_match);
1078 static const struct i2c_device_id max17042_id[] = {
1079 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1080 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1081 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1084 MODULE_DEVICE_TABLE(i2c, max17042_id);
1086 static struct i2c_driver max17042_i2c_driver = {
1089 .of_match_table = of_match_ptr(max17042_dt_match),
1090 .pm = &max17042_pm_ops,
1092 .probe = max17042_probe,
1093 .id_table = max17042_id,
1095 module_i2c_driver(max17042_i2c_driver);
1097 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1098 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1099 MODULE_LICENSE("GPL");