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0001 // SPDX-License-Identifier: GPL-2.0+
0002 //
0003 // Fuel gauge driver for Maxim 17042 / 8966 / 8997
0004 //  Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
0005 //
0006 // Copyright (C) 2011 Samsung Electronics
0007 // MyungJoo Ham <myungjoo.ham@samsung.com>
0008 //
0009 // This driver is based on max17040_battery.c
0010 
0011 #include <linux/acpi.h>
0012 #include <linux/devm-helpers.h>
0013 #include <linux/init.h>
0014 #include <linux/module.h>
0015 #include <linux/slab.h>
0016 #include <linux/i2c.h>
0017 #include <linux/delay.h>
0018 #include <linux/interrupt.h>
0019 #include <linux/pm.h>
0020 #include <linux/mod_devicetable.h>
0021 #include <linux/power_supply.h>
0022 #include <linux/power/max17042_battery.h>
0023 #include <linux/of.h>
0024 #include <linux/regmap.h>
0025 
0026 /* Status register bits */
0027 #define STATUS_POR_BIT         (1 << 1)
0028 #define STATUS_BST_BIT         (1 << 3)
0029 #define STATUS_VMN_BIT         (1 << 8)
0030 #define STATUS_TMN_BIT         (1 << 9)
0031 #define STATUS_SMN_BIT         (1 << 10)
0032 #define STATUS_BI_BIT          (1 << 11)
0033 #define STATUS_VMX_BIT         (1 << 12)
0034 #define STATUS_TMX_BIT         (1 << 13)
0035 #define STATUS_SMX_BIT         (1 << 14)
0036 #define STATUS_BR_BIT          (1 << 15)
0037 
0038 /* Interrupt mask bits */
0039 #define CONFIG_ALRT_BIT_ENBL    (1 << 2)
0040 
0041 #define VFSOC0_LOCK     0x0000
0042 #define VFSOC0_UNLOCK       0x0080
0043 #define MODEL_UNLOCK1   0X0059
0044 #define MODEL_UNLOCK2   0X00C4
0045 #define MODEL_LOCK1     0X0000
0046 #define MODEL_LOCK2     0X0000
0047 
0048 #define dQ_ACC_DIV  0x4
0049 #define dP_ACC_100  0x1900
0050 #define dP_ACC_200  0x3200
0051 
0052 #define MAX17042_VMAX_TOLERANCE     50 /* 50 mV */
0053 
0054 struct max17042_chip {
0055     struct i2c_client *client;
0056     struct regmap *regmap;
0057     struct power_supply *battery;
0058     enum max170xx_chip_type chip_type;
0059     struct max17042_platform_data *pdata;
0060     struct work_struct work;
0061     int    init_complete;
0062 };
0063 
0064 static enum power_supply_property max17042_battery_props[] = {
0065     POWER_SUPPLY_PROP_STATUS,
0066     POWER_SUPPLY_PROP_PRESENT,
0067     POWER_SUPPLY_PROP_TECHNOLOGY,
0068     POWER_SUPPLY_PROP_CYCLE_COUNT,
0069     POWER_SUPPLY_PROP_VOLTAGE_MAX,
0070     POWER_SUPPLY_PROP_VOLTAGE_MIN,
0071     POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
0072     POWER_SUPPLY_PROP_VOLTAGE_NOW,
0073     POWER_SUPPLY_PROP_VOLTAGE_AVG,
0074     POWER_SUPPLY_PROP_VOLTAGE_OCV,
0075     POWER_SUPPLY_PROP_CAPACITY,
0076     POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
0077     POWER_SUPPLY_PROP_CHARGE_FULL,
0078     POWER_SUPPLY_PROP_CHARGE_NOW,
0079     POWER_SUPPLY_PROP_CHARGE_COUNTER,
0080     POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
0081     POWER_SUPPLY_PROP_TEMP,
0082     POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
0083     POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
0084     POWER_SUPPLY_PROP_TEMP_MIN,
0085     POWER_SUPPLY_PROP_TEMP_MAX,
0086     POWER_SUPPLY_PROP_HEALTH,
0087     POWER_SUPPLY_PROP_SCOPE,
0088     POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
0089     // these two have to be at the end on the list
0090     POWER_SUPPLY_PROP_CURRENT_NOW,
0091     POWER_SUPPLY_PROP_CURRENT_AVG,
0092 };
0093 
0094 static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
0095 {
0096     int ret;
0097     u32 data;
0098     struct regmap *map = chip->regmap;
0099 
0100     ret = regmap_read(map, MAX17042_TEMP, &data);
0101     if (ret < 0)
0102         return ret;
0103 
0104     *temp = sign_extend32(data, 15);
0105     /* The value is converted into deci-centigrade scale */
0106     /* Units of LSB = 1 / 256 degree Celsius */
0107     *temp = *temp * 10 / 256;
0108     return 0;
0109 }
0110 
0111 static int max17042_get_status(struct max17042_chip *chip, int *status)
0112 {
0113     int ret, charge_full, charge_now;
0114     int avg_current;
0115     u32 data;
0116 
0117     ret = power_supply_am_i_supplied(chip->battery);
0118     if (ret < 0) {
0119         *status = POWER_SUPPLY_STATUS_UNKNOWN;
0120         return 0;
0121     }
0122     if (ret == 0) {
0123         *status = POWER_SUPPLY_STATUS_DISCHARGING;
0124         return 0;
0125     }
0126 
0127     /*
0128      * The MAX170xx has builtin end-of-charge detection and will update
0129      * FullCAP to match RepCap when it detects end of charging.
0130      *
0131      * When this cycle the battery gets charged to a higher (calculated)
0132      * capacity then the previous cycle then FullCAP will get updated
0133      * continuously once end-of-charge detection kicks in, so allow the
0134      * 2 to differ a bit.
0135      */
0136 
0137     ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
0138     if (ret < 0)
0139         return ret;
0140 
0141     ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
0142     if (ret < 0)
0143         return ret;
0144 
0145     if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) {
0146         *status = POWER_SUPPLY_STATUS_FULL;
0147         return 0;
0148     }
0149 
0150     /*
0151      * Even though we are supplied, we may still be discharging if the
0152      * supply is e.g. only delivering 5V 0.5A. Check current if available.
0153      */
0154     if (!chip->pdata->enable_current_sense) {
0155         *status = POWER_SUPPLY_STATUS_CHARGING;
0156         return 0;
0157     }
0158 
0159     ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data);
0160     if (ret < 0)
0161         return ret;
0162 
0163     avg_current = sign_extend32(data, 15);
0164     avg_current *= 1562500 / chip->pdata->r_sns;
0165 
0166     if (avg_current > 0)
0167         *status = POWER_SUPPLY_STATUS_CHARGING;
0168     else
0169         *status = POWER_SUPPLY_STATUS_DISCHARGING;
0170 
0171     return 0;
0172 }
0173 
0174 static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
0175 {
0176     int temp, vavg, vbatt, ret;
0177     u32 val;
0178 
0179     ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
0180     if (ret < 0)
0181         goto health_error;
0182 
0183     /* bits [0-3] unused */
0184     vavg = val * 625 / 8;
0185     /* Convert to millivolts */
0186     vavg /= 1000;
0187 
0188     ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
0189     if (ret < 0)
0190         goto health_error;
0191 
0192     /* bits [0-3] unused */
0193     vbatt = val * 625 / 8;
0194     /* Convert to millivolts */
0195     vbatt /= 1000;
0196 
0197     if (vavg < chip->pdata->vmin) {
0198         *health = POWER_SUPPLY_HEALTH_DEAD;
0199         goto out;
0200     }
0201 
0202     if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
0203         *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
0204         goto out;
0205     }
0206 
0207     ret = max17042_get_temperature(chip, &temp);
0208     if (ret < 0)
0209         goto health_error;
0210 
0211     if (temp < chip->pdata->temp_min) {
0212         *health = POWER_SUPPLY_HEALTH_COLD;
0213         goto out;
0214     }
0215 
0216     if (temp > chip->pdata->temp_max) {
0217         *health = POWER_SUPPLY_HEALTH_OVERHEAT;
0218         goto out;
0219     }
0220 
0221     *health = POWER_SUPPLY_HEALTH_GOOD;
0222 
0223 out:
0224     return 0;
0225 
0226 health_error:
0227     return ret;
0228 }
0229 
0230 static int max17042_get_property(struct power_supply *psy,
0231                 enum power_supply_property psp,
0232                 union power_supply_propval *val)
0233 {
0234     struct max17042_chip *chip = power_supply_get_drvdata(psy);
0235     struct regmap *map = chip->regmap;
0236     int ret;
0237     u32 data;
0238     u64 data64;
0239 
0240     if (!chip->init_complete)
0241         return -EAGAIN;
0242 
0243     switch (psp) {
0244     case POWER_SUPPLY_PROP_STATUS:
0245         ret = max17042_get_status(chip, &val->intval);
0246         if (ret < 0)
0247             return ret;
0248         break;
0249     case POWER_SUPPLY_PROP_PRESENT:
0250         ret = regmap_read(map, MAX17042_STATUS, &data);
0251         if (ret < 0)
0252             return ret;
0253 
0254         if (data & MAX17042_STATUS_BattAbsent)
0255             val->intval = 0;
0256         else
0257             val->intval = 1;
0258         break;
0259     case POWER_SUPPLY_PROP_TECHNOLOGY:
0260         val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
0261         break;
0262     case POWER_SUPPLY_PROP_CYCLE_COUNT:
0263         ret = regmap_read(map, MAX17042_Cycles, &data);
0264         if (ret < 0)
0265             return ret;
0266 
0267         val->intval = data;
0268         break;
0269     case POWER_SUPPLY_PROP_VOLTAGE_MAX:
0270         ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
0271         if (ret < 0)
0272             return ret;
0273 
0274         val->intval = data >> 8;
0275         val->intval *= 20000; /* Units of LSB = 20mV */
0276         break;
0277     case POWER_SUPPLY_PROP_VOLTAGE_MIN:
0278         ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
0279         if (ret < 0)
0280             return ret;
0281 
0282         val->intval = (data & 0xff) * 20000; /* Units of 20mV */
0283         break;
0284     case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
0285         if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
0286             ret = regmap_read(map, MAX17042_V_empty, &data);
0287         else
0288             ret = regmap_read(map, MAX17047_V_empty, &data);
0289         if (ret < 0)
0290             return ret;
0291 
0292         val->intval = data >> 7;
0293         val->intval *= 10000; /* Units of LSB = 10mV */
0294         break;
0295     case POWER_SUPPLY_PROP_VOLTAGE_NOW:
0296         ret = regmap_read(map, MAX17042_VCELL, &data);
0297         if (ret < 0)
0298             return ret;
0299 
0300         val->intval = data * 625 / 8;
0301         break;
0302     case POWER_SUPPLY_PROP_VOLTAGE_AVG:
0303         ret = regmap_read(map, MAX17042_AvgVCELL, &data);
0304         if (ret < 0)
0305             return ret;
0306 
0307         val->intval = data * 625 / 8;
0308         break;
0309     case POWER_SUPPLY_PROP_VOLTAGE_OCV:
0310         ret = regmap_read(map, MAX17042_OCVInternal, &data);
0311         if (ret < 0)
0312             return ret;
0313 
0314         val->intval = data * 625 / 8;
0315         break;
0316     case POWER_SUPPLY_PROP_CAPACITY:
0317         if (chip->pdata->enable_current_sense)
0318             ret = regmap_read(map, MAX17042_RepSOC, &data);
0319         else
0320             ret = regmap_read(map, MAX17042_VFSOC, &data);
0321         if (ret < 0)
0322             return ret;
0323 
0324         val->intval = data >> 8;
0325         break;
0326     case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
0327         ret = regmap_read(map, MAX17042_DesignCap, &data);
0328         if (ret < 0)
0329             return ret;
0330 
0331         data64 = data * 5000000ll;
0332         do_div(data64, chip->pdata->r_sns);
0333         val->intval = data64;
0334         break;
0335     case POWER_SUPPLY_PROP_CHARGE_FULL:
0336         ret = regmap_read(map, MAX17042_FullCAP, &data);
0337         if (ret < 0)
0338             return ret;
0339 
0340         data64 = data * 5000000ll;
0341         do_div(data64, chip->pdata->r_sns);
0342         val->intval = data64;
0343         break;
0344     case POWER_SUPPLY_PROP_CHARGE_NOW:
0345         ret = regmap_read(map, MAX17042_RepCap, &data);
0346         if (ret < 0)
0347             return ret;
0348 
0349         data64 = data * 5000000ll;
0350         do_div(data64, chip->pdata->r_sns);
0351         val->intval = data64;
0352         break;
0353     case POWER_SUPPLY_PROP_CHARGE_COUNTER:
0354         ret = regmap_read(map, MAX17042_QH, &data);
0355         if (ret < 0)
0356             return ret;
0357 
0358         data64 = sign_extend64(data, 15) * 5000000ll;
0359         val->intval = div_s64(data64, chip->pdata->r_sns);
0360         break;
0361     case POWER_SUPPLY_PROP_TEMP:
0362         ret = max17042_get_temperature(chip, &val->intval);
0363         if (ret < 0)
0364             return ret;
0365         break;
0366     case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
0367         ret = regmap_read(map, MAX17042_TALRT_Th, &data);
0368         if (ret < 0)
0369             return ret;
0370         /* LSB is Alert Minimum. In deci-centigrade */
0371         val->intval = sign_extend32(data & 0xff, 7) * 10;
0372         break;
0373     case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
0374         ret = regmap_read(map, MAX17042_TALRT_Th, &data);
0375         if (ret < 0)
0376             return ret;
0377         /* MSB is Alert Maximum. In deci-centigrade */
0378         val->intval = sign_extend32(data >> 8, 7) * 10;
0379         break;
0380     case POWER_SUPPLY_PROP_TEMP_MIN:
0381         val->intval = chip->pdata->temp_min;
0382         break;
0383     case POWER_SUPPLY_PROP_TEMP_MAX:
0384         val->intval = chip->pdata->temp_max;
0385         break;
0386     case POWER_SUPPLY_PROP_HEALTH:
0387         ret = max17042_get_battery_health(chip, &val->intval);
0388         if (ret < 0)
0389             return ret;
0390         break;
0391     case POWER_SUPPLY_PROP_SCOPE:
0392         val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
0393         break;
0394     case POWER_SUPPLY_PROP_CURRENT_NOW:
0395         if (chip->pdata->enable_current_sense) {
0396             ret = regmap_read(map, MAX17042_Current, &data);
0397             if (ret < 0)
0398                 return ret;
0399 
0400             data64 = sign_extend64(data, 15) * 1562500ll;
0401             val->intval = div_s64(data64, chip->pdata->r_sns);
0402         } else {
0403             return -EINVAL;
0404         }
0405         break;
0406     case POWER_SUPPLY_PROP_CURRENT_AVG:
0407         if (chip->pdata->enable_current_sense) {
0408             ret = regmap_read(map, MAX17042_AvgCurrent, &data);
0409             if (ret < 0)
0410                 return ret;
0411 
0412             data64 = sign_extend64(data, 15) * 1562500ll;
0413             val->intval = div_s64(data64, chip->pdata->r_sns);
0414         } else {
0415             return -EINVAL;
0416         }
0417         break;
0418     case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
0419         ret = regmap_read(map, MAX17042_ICHGTerm, &data);
0420         if (ret < 0)
0421             return ret;
0422 
0423         data64 = data * 1562500ll;
0424         val->intval = div_s64(data64, chip->pdata->r_sns);
0425         break;
0426     case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
0427         ret = regmap_read(map, MAX17042_TTE, &data);
0428         if (ret < 0)
0429             return ret;
0430 
0431         val->intval = data * 5625 / 1000;
0432         break;
0433     default:
0434         return -EINVAL;
0435     }
0436     return 0;
0437 }
0438 
0439 static int max17042_set_property(struct power_supply *psy,
0440                 enum power_supply_property psp,
0441                 const union power_supply_propval *val)
0442 {
0443     struct max17042_chip *chip = power_supply_get_drvdata(psy);
0444     struct regmap *map = chip->regmap;
0445     int ret = 0;
0446     u32 data;
0447     int8_t temp;
0448 
0449     switch (psp) {
0450     case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
0451         ret = regmap_read(map, MAX17042_TALRT_Th, &data);
0452         if (ret < 0)
0453             return ret;
0454 
0455         /* Input in deci-centigrade, convert to centigrade */
0456         temp = val->intval / 10;
0457         /* force min < max */
0458         if (temp >= (int8_t)(data >> 8))
0459             temp = (int8_t)(data >> 8) - 1;
0460         /* Write both MAX and MIN ALERT */
0461         data = (data & 0xff00) + temp;
0462         ret = regmap_write(map, MAX17042_TALRT_Th, data);
0463         break;
0464     case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
0465         ret = regmap_read(map, MAX17042_TALRT_Th, &data);
0466         if (ret < 0)
0467             return ret;
0468 
0469         /* Input in Deci-Centigrade, convert to centigrade */
0470         temp = val->intval / 10;
0471         /* force max > min */
0472         if (temp <= (int8_t)(data & 0xff))
0473             temp = (int8_t)(data & 0xff) + 1;
0474         /* Write both MAX and MIN ALERT */
0475         data = (data & 0xff) + (temp << 8);
0476         ret = regmap_write(map, MAX17042_TALRT_Th, data);
0477         break;
0478     default:
0479         ret = -EINVAL;
0480     }
0481 
0482     return ret;
0483 }
0484 
0485 static int max17042_property_is_writeable(struct power_supply *psy,
0486         enum power_supply_property psp)
0487 {
0488     int ret;
0489 
0490     switch (psp) {
0491     case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
0492     case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
0493         ret = 1;
0494         break;
0495     default:
0496         ret = 0;
0497     }
0498 
0499     return ret;
0500 }
0501 
0502 static void max17042_external_power_changed(struct power_supply *psy)
0503 {
0504     power_supply_changed(psy);
0505 }
0506 
0507 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
0508 {
0509     int retries = 8;
0510     int ret;
0511     u32 read_value;
0512 
0513     do {
0514         ret = regmap_write(map, reg, value);
0515         regmap_read(map, reg, &read_value);
0516         if (read_value != value) {
0517             ret = -EIO;
0518             retries--;
0519         }
0520     } while (retries && read_value != value);
0521 
0522     if (ret < 0)
0523         pr_err("%s: err %d\n", __func__, ret);
0524 
0525     return ret;
0526 }
0527 
0528 static inline void max17042_override_por(struct regmap *map,
0529                      u8 reg, u16 value)
0530 {
0531     if (value)
0532         regmap_write(map, reg, value);
0533 }
0534 
0535 static inline void max17042_unlock_model(struct max17042_chip *chip)
0536 {
0537     struct regmap *map = chip->regmap;
0538 
0539     regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
0540     regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
0541 }
0542 
0543 static inline void max17042_lock_model(struct max17042_chip *chip)
0544 {
0545     struct regmap *map = chip->regmap;
0546 
0547     regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
0548     regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
0549 }
0550 
0551 static inline void max17042_write_model_data(struct max17042_chip *chip,
0552                     u8 addr, int size)
0553 {
0554     struct regmap *map = chip->regmap;
0555     int i;
0556 
0557     for (i = 0; i < size; i++)
0558         regmap_write(map, addr + i,
0559             chip->pdata->config_data->cell_char_tbl[i]);
0560 }
0561 
0562 static inline void max17042_read_model_data(struct max17042_chip *chip,
0563                     u8 addr, u16 *data, int size)
0564 {
0565     struct regmap *map = chip->regmap;
0566     int i;
0567     u32 tmp;
0568 
0569     for (i = 0; i < size; i++) {
0570         regmap_read(map, addr + i, &tmp);
0571         data[i] = (u16)tmp;
0572     }
0573 }
0574 
0575 static inline int max17042_model_data_compare(struct max17042_chip *chip,
0576                     u16 *data1, u16 *data2, int size)
0577 {
0578     int i;
0579 
0580     if (memcmp(data1, data2, size)) {
0581         dev_err(&chip->client->dev, "%s compare failed\n", __func__);
0582         for (i = 0; i < size; i++)
0583             dev_info(&chip->client->dev, "0x%x, 0x%x",
0584                 data1[i], data2[i]);
0585         dev_info(&chip->client->dev, "\n");
0586         return -EINVAL;
0587     }
0588     return 0;
0589 }
0590 
0591 static int max17042_init_model(struct max17042_chip *chip)
0592 {
0593     int ret;
0594     int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
0595     u16 *temp_data;
0596 
0597     temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
0598     if (!temp_data)
0599         return -ENOMEM;
0600 
0601     max17042_unlock_model(chip);
0602     max17042_write_model_data(chip, MAX17042_MODELChrTbl,
0603                 table_size);
0604     max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
0605                 table_size);
0606 
0607     ret = max17042_model_data_compare(
0608         chip,
0609         chip->pdata->config_data->cell_char_tbl,
0610         temp_data,
0611         table_size);
0612 
0613     max17042_lock_model(chip);
0614     kfree(temp_data);
0615 
0616     return ret;
0617 }
0618 
0619 static int max17042_verify_model_lock(struct max17042_chip *chip)
0620 {
0621     int i;
0622     int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
0623     u16 *temp_data;
0624     int ret = 0;
0625 
0626     temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
0627     if (!temp_data)
0628         return -ENOMEM;
0629 
0630     max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
0631                 table_size);
0632     for (i = 0; i < table_size; i++)
0633         if (temp_data[i])
0634             ret = -EINVAL;
0635 
0636     kfree(temp_data);
0637     return ret;
0638 }
0639 
0640 static void max17042_write_config_regs(struct max17042_chip *chip)
0641 {
0642     struct max17042_config_data *config = chip->pdata->config_data;
0643     struct regmap *map = chip->regmap;
0644 
0645     regmap_write(map, MAX17042_CONFIG, config->config);
0646     regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
0647     regmap_write(map, MAX17042_FilterCFG,
0648             config->filter_cfg);
0649     regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
0650     if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
0651             chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050 ||
0652             chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)
0653         regmap_write(map, MAX17047_FullSOCThr,
0654                         config->full_soc_thresh);
0655 }
0656 
0657 static void  max17042_write_custom_regs(struct max17042_chip *chip)
0658 {
0659     struct max17042_config_data *config = chip->pdata->config_data;
0660     struct regmap *map = chip->regmap;
0661 
0662     max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
0663     max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
0664     max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
0665     if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
0666         regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
0667         max17042_write_verify_reg(map, MAX17042_K_empty0,
0668                     config->kempty0);
0669     } else {
0670         max17042_write_verify_reg(map, MAX17047_QRTbl00,
0671                         config->qrtbl00);
0672         max17042_write_verify_reg(map, MAX17047_QRTbl10,
0673                         config->qrtbl10);
0674         max17042_write_verify_reg(map, MAX17047_QRTbl20,
0675                         config->qrtbl20);
0676         max17042_write_verify_reg(map, MAX17047_QRTbl30,
0677                         config->qrtbl30);
0678     }
0679 }
0680 
0681 static void max17042_update_capacity_regs(struct max17042_chip *chip)
0682 {
0683     struct max17042_config_data *config = chip->pdata->config_data;
0684     struct regmap *map = chip->regmap;
0685 
0686     max17042_write_verify_reg(map, MAX17042_FullCAP,
0687                 config->fullcap);
0688     regmap_write(map, MAX17042_DesignCap, config->design_cap);
0689     max17042_write_verify_reg(map, MAX17042_FullCAPNom,
0690                 config->fullcapnom);
0691 }
0692 
0693 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
0694 {
0695     unsigned int vfSoc;
0696     struct regmap *map = chip->regmap;
0697 
0698     regmap_read(map, MAX17042_VFSOC, &vfSoc);
0699     regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
0700     max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
0701     regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
0702 }
0703 
0704 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
0705 {
0706     u32 full_cap0, rep_cap, dq_acc, vfSoc;
0707     u32 rem_cap;
0708 
0709     struct max17042_config_data *config = chip->pdata->config_data;
0710     struct regmap *map = chip->regmap;
0711 
0712     regmap_read(map, MAX17042_FullCAP0, &full_cap0);
0713     regmap_read(map, MAX17042_VFSOC, &vfSoc);
0714 
0715     /* fg_vfSoc needs to shifted by 8 bits to get the
0716      * perc in 1% accuracy, to get the right rem_cap multiply
0717      * full_cap0, fg_vfSoc and devide by 100
0718      */
0719     rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
0720     max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
0721 
0722     rep_cap = rem_cap;
0723     max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
0724 
0725     /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
0726     dq_acc = config->fullcap / dQ_ACC_DIV;
0727     max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
0728     max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
0729 
0730     max17042_write_verify_reg(map, MAX17042_FullCAP,
0731             config->fullcap);
0732     regmap_write(map, MAX17042_DesignCap,
0733             config->design_cap);
0734     max17042_write_verify_reg(map, MAX17042_FullCAPNom,
0735             config->fullcapnom);
0736     /* Update SOC register with new SOC */
0737     regmap_write(map, MAX17042_RepSOC, vfSoc);
0738 }
0739 
0740 /*
0741  * Block write all the override values coming from platform data.
0742  * This function MUST be called before the POR initialization procedure
0743  * specified by maxim.
0744  */
0745 static inline void max17042_override_por_values(struct max17042_chip *chip)
0746 {
0747     struct regmap *map = chip->regmap;
0748     struct max17042_config_data *config = chip->pdata->config_data;
0749 
0750     max17042_override_por(map, MAX17042_TGAIN, config->tgain);
0751     max17042_override_por(map, MAX17042_TOFF, config->toff);
0752     max17042_override_por(map, MAX17042_CGAIN, config->cgain);
0753     max17042_override_por(map, MAX17042_COFF, config->coff);
0754 
0755     max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
0756     max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
0757     max17042_override_por(map, MAX17042_SALRT_Th,
0758                         config->soc_alrt_thresh);
0759     max17042_override_por(map, MAX17042_CONFIG, config->config);
0760     max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
0761 
0762     max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
0763     max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
0764 
0765     max17042_override_por(map, MAX17042_AtRate, config->at_rate);
0766     max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
0767     max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
0768     max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
0769     max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
0770 
0771     max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
0772     max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
0773     max17042_override_por(map, MAX17042_dQacc, config->dqacc);
0774     max17042_override_por(map, MAX17042_dPacc, config->dpacc);
0775 
0776     max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
0777     max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
0778 
0779     if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
0780         max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
0781         max17042_override_por(map, MAX17042_SOC_empty, config->socempty);
0782         max17042_override_por(map, MAX17042_V_empty, config->vempty);
0783         max17042_override_por(map, MAX17042_EmptyTempCo, config->empty_tempco);
0784         max17042_override_por(map, MAX17042_K_empty0, config->kempty0);
0785     }
0786 
0787     if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) ||
0788         (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
0789         (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) {
0790         max17042_override_por(map, MAX17042_IAvg_empty, config->iavg_empty);
0791         max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
0792         max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
0793         max17042_override_por(map, MAX17042_FCTC, config->fctc);
0794     }
0795 
0796     if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
0797         (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050) ||
0798         (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)) {
0799         max17042_override_por(map, MAX17047_V_empty, config->vempty);
0800     }
0801 }
0802 
0803 static int max17042_init_chip(struct max17042_chip *chip)
0804 {
0805     struct regmap *map = chip->regmap;
0806     int ret;
0807 
0808     max17042_override_por_values(chip);
0809     /* After Power up, the MAX17042 requires 500mS in order
0810      * to perform signal debouncing and initial SOC reporting
0811      */
0812     msleep(500);
0813 
0814     /* Initialize configuration */
0815     max17042_write_config_regs(chip);
0816 
0817     /* write cell characterization data */
0818     ret = max17042_init_model(chip);
0819     if (ret) {
0820         dev_err(&chip->client->dev, "%s init failed\n",
0821             __func__);
0822         return -EIO;
0823     }
0824 
0825     ret = max17042_verify_model_lock(chip);
0826     if (ret) {
0827         dev_err(&chip->client->dev, "%s lock verify failed\n",
0828             __func__);
0829         return -EIO;
0830     }
0831     /* write custom parameters */
0832     max17042_write_custom_regs(chip);
0833 
0834     /* update capacity params */
0835     max17042_update_capacity_regs(chip);
0836 
0837     /* delay must be atleast 350mS to allow VFSOC
0838      * to be calculated from the new configuration
0839      */
0840     msleep(350);
0841 
0842     /* reset vfsoc0 reg */
0843     max17042_reset_vfsoc0_reg(chip);
0844 
0845     /* load new capacity params */
0846     max17042_load_new_capacity_params(chip);
0847 
0848     /* Init complete, Clear the POR bit */
0849     regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
0850     return 0;
0851 }
0852 
0853 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
0854 {
0855     struct regmap *map = chip->regmap;
0856     u32 soc, soc_tr;
0857 
0858     /* program interrupt thresholds such that we should
0859      * get interrupt for every 'off' perc change in the soc
0860      */
0861     regmap_read(map, MAX17042_RepSOC, &soc);
0862     soc >>= 8;
0863     soc_tr = (soc + off) << 8;
0864     if (off < soc)
0865         soc_tr |= soc - off;
0866     regmap_write(map, MAX17042_SALRT_Th, soc_tr);
0867 }
0868 
0869 static irqreturn_t max17042_thread_handler(int id, void *dev)
0870 {
0871     struct max17042_chip *chip = dev;
0872     u32 val;
0873     int ret;
0874 
0875     ret = regmap_read(chip->regmap, MAX17042_STATUS, &val);
0876     if (ret)
0877         return IRQ_HANDLED;
0878 
0879     if ((val & STATUS_SMN_BIT) || (val & STATUS_SMX_BIT)) {
0880         dev_dbg(&chip->client->dev, "SOC threshold INTR\n");
0881         max17042_set_soc_threshold(chip, 1);
0882     }
0883 
0884     /* we implicitly handle all alerts via power_supply_changed */
0885     regmap_clear_bits(chip->regmap, MAX17042_STATUS,
0886               0xFFFF & ~(STATUS_POR_BIT | STATUS_BST_BIT));
0887 
0888     power_supply_changed(chip->battery);
0889     return IRQ_HANDLED;
0890 }
0891 
0892 static void max17042_init_worker(struct work_struct *work)
0893 {
0894     struct max17042_chip *chip = container_of(work,
0895                 struct max17042_chip, work);
0896     int ret;
0897 
0898     /* Initialize registers according to values from the platform data */
0899     if (chip->pdata->enable_por_init && chip->pdata->config_data) {
0900         ret = max17042_init_chip(chip);
0901         if (ret)
0902             return;
0903     }
0904 
0905     chip->init_complete = 1;
0906 }
0907 
0908 #ifdef CONFIG_OF
0909 static struct max17042_platform_data *
0910 max17042_get_of_pdata(struct max17042_chip *chip)
0911 {
0912     struct device *dev = &chip->client->dev;
0913     struct device_node *np = dev->of_node;
0914     u32 prop;
0915     struct max17042_platform_data *pdata;
0916 
0917     pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
0918     if (!pdata)
0919         return NULL;
0920 
0921     /*
0922      * Require current sense resistor value to be specified for
0923      * current-sense functionality to be enabled at all.
0924      */
0925     if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
0926         pdata->r_sns = prop;
0927         pdata->enable_current_sense = true;
0928     }
0929 
0930     if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
0931         pdata->temp_min = INT_MIN;
0932     if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
0933         pdata->temp_max = INT_MAX;
0934     if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
0935         pdata->vmin = INT_MIN;
0936     if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
0937         pdata->vmax = INT_MAX;
0938 
0939     return pdata;
0940 }
0941 #endif
0942 
0943 static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
0944     /*
0945      * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
0946      * when the voltage FG reports 95%, as recommended in the datasheet.
0947      */
0948     { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
0949 };
0950 
0951 static struct max17042_platform_data *
0952 max17042_get_default_pdata(struct max17042_chip *chip)
0953 {
0954     struct device *dev = &chip->client->dev;
0955     struct max17042_platform_data *pdata;
0956     int ret, misc_cfg;
0957 
0958     /*
0959      * The MAX17047 gets used on x86 where we might not have pdata, assume
0960      * the firmware will already have initialized the fuel-gauge and provide
0961      * default values for the non init bits to make things work.
0962      */
0963     pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
0964     if (!pdata)
0965         return pdata;
0966 
0967     if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
0968         (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) {
0969         pdata->init_data = max17047_default_pdata_init_regs;
0970         pdata->num_init_data =
0971             ARRAY_SIZE(max17047_default_pdata_init_regs);
0972     }
0973 
0974     ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
0975     if (ret < 0)
0976         return NULL;
0977 
0978     /* If bits 0-1 are set to 3 then only Voltage readings are used */
0979     if ((misc_cfg & 0x3) == 0x3)
0980         pdata->enable_current_sense = false;
0981     else
0982         pdata->enable_current_sense = true;
0983 
0984     pdata->vmin = MAX17042_DEFAULT_VMIN;
0985     pdata->vmax = MAX17042_DEFAULT_VMAX;
0986     pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
0987     pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
0988 
0989     return pdata;
0990 }
0991 
0992 static struct max17042_platform_data *
0993 max17042_get_pdata(struct max17042_chip *chip)
0994 {
0995     struct device *dev = &chip->client->dev;
0996 
0997 #ifdef CONFIG_OF
0998     if (dev->of_node)
0999         return max17042_get_of_pdata(chip);
1000 #endif
1001     if (dev->platform_data)
1002         return dev->platform_data;
1003 
1004     return max17042_get_default_pdata(chip);
1005 }
1006 
1007 static const struct regmap_config max17042_regmap_config = {
1008     .reg_bits = 8,
1009     .val_bits = 16,
1010     .val_format_endian = REGMAP_ENDIAN_NATIVE,
1011 };
1012 
1013 static const struct power_supply_desc max17042_psy_desc = {
1014     .name       = "max170xx_battery",
1015     .type       = POWER_SUPPLY_TYPE_BATTERY,
1016     .get_property   = max17042_get_property,
1017     .set_property   = max17042_set_property,
1018     .property_is_writeable  = max17042_property_is_writeable,
1019     .external_power_changed = max17042_external_power_changed,
1020     .properties = max17042_battery_props,
1021     .num_properties = ARRAY_SIZE(max17042_battery_props),
1022 };
1023 
1024 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
1025     .name       = "max170xx_battery",
1026     .type       = POWER_SUPPLY_TYPE_BATTERY,
1027     .get_property   = max17042_get_property,
1028     .set_property   = max17042_set_property,
1029     .property_is_writeable  = max17042_property_is_writeable,
1030     .properties = max17042_battery_props,
1031     .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
1032 };
1033 
1034 static int max17042_probe(struct i2c_client *client,
1035             const struct i2c_device_id *id)
1036 {
1037     struct i2c_adapter *adapter = client->adapter;
1038     const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
1039     struct power_supply_config psy_cfg = {};
1040     const struct acpi_device_id *acpi_id = NULL;
1041     struct device *dev = &client->dev;
1042     struct max17042_chip *chip;
1043     int ret;
1044     int i;
1045     u32 val;
1046 
1047     if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
1048         return -EIO;
1049 
1050     chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1051     if (!chip)
1052         return -ENOMEM;
1053 
1054     chip->client = client;
1055     if (id) {
1056         chip->chip_type = id->driver_data;
1057     } else {
1058         acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
1059         if (!acpi_id)
1060             return -ENODEV;
1061 
1062         chip->chip_type = acpi_id->driver_data;
1063     }
1064     chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
1065     if (IS_ERR(chip->regmap)) {
1066         dev_err(&client->dev, "Failed to initialize regmap\n");
1067         return -EINVAL;
1068     }
1069 
1070     chip->pdata = max17042_get_pdata(chip);
1071     if (!chip->pdata) {
1072         dev_err(&client->dev, "no platform data provided\n");
1073         return -EINVAL;
1074     }
1075 
1076     i2c_set_clientdata(client, chip);
1077     psy_cfg.drv_data = chip;
1078     psy_cfg.of_node = dev->of_node;
1079 
1080     /* When current is not measured,
1081      * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
1082     if (!chip->pdata->enable_current_sense)
1083         max17042_desc = &max17042_no_current_sense_psy_desc;
1084 
1085     if (chip->pdata->r_sns == 0)
1086         chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1087 
1088     if (chip->pdata->init_data)
1089         for (i = 0; i < chip->pdata->num_init_data; i++)
1090             regmap_write(chip->regmap,
1091                     chip->pdata->init_data[i].addr,
1092                     chip->pdata->init_data[i].data);
1093 
1094     if (!chip->pdata->enable_current_sense) {
1095         regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1096         regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1097         regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1098     }
1099 
1100     chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1101                            &psy_cfg);
1102     if (IS_ERR(chip->battery)) {
1103         dev_err(&client->dev, "failed: power supply register\n");
1104         return PTR_ERR(chip->battery);
1105     }
1106 
1107     if (client->irq) {
1108         unsigned int flags = IRQF_ONESHOT;
1109 
1110         /*
1111          * On ACPI systems the IRQ may be handled by ACPI-event code,
1112          * so we need to share (if the ACPI code is willing to share).
1113          */
1114         if (acpi_id)
1115             flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
1116 
1117         ret = devm_request_threaded_irq(&client->dev, client->irq,
1118                         NULL,
1119                         max17042_thread_handler, flags,
1120                         chip->battery->desc->name,
1121                         chip);
1122         if (!ret) {
1123             regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1124                     CONFIG_ALRT_BIT_ENBL,
1125                     CONFIG_ALRT_BIT_ENBL);
1126             max17042_set_soc_threshold(chip, 1);
1127         } else {
1128             client->irq = 0;
1129             if (ret != -EBUSY)
1130                 dev_err(&client->dev, "Failed to get IRQ\n");
1131         }
1132     }
1133     /* Not able to update the charge threshold when exceeded? -> disable */
1134     if (!client->irq)
1135         regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
1136 
1137     regmap_read(chip->regmap, MAX17042_STATUS, &val);
1138     if (val & STATUS_POR_BIT) {
1139         ret = devm_work_autocancel(&client->dev, &chip->work,
1140                        max17042_init_worker);
1141         if (ret)
1142             return ret;
1143         schedule_work(&chip->work);
1144     } else {
1145         chip->init_complete = 1;
1146     }
1147 
1148     return 0;
1149 }
1150 
1151 #ifdef CONFIG_PM_SLEEP
1152 static int max17042_suspend(struct device *dev)
1153 {
1154     struct max17042_chip *chip = dev_get_drvdata(dev);
1155 
1156     /*
1157      * disable the irq and enable irq_wake
1158      * capability to the interrupt line.
1159      */
1160     if (chip->client->irq) {
1161         disable_irq(chip->client->irq);
1162         enable_irq_wake(chip->client->irq);
1163     }
1164 
1165     return 0;
1166 }
1167 
1168 static int max17042_resume(struct device *dev)
1169 {
1170     struct max17042_chip *chip = dev_get_drvdata(dev);
1171 
1172     if (chip->client->irq) {
1173         disable_irq_wake(chip->client->irq);
1174         enable_irq(chip->client->irq);
1175         /* re-program the SOC thresholds to 1% change */
1176         max17042_set_soc_threshold(chip, 1);
1177     }
1178 
1179     return 0;
1180 }
1181 #endif
1182 
1183 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1184             max17042_resume);
1185 
1186 #ifdef CONFIG_ACPI
1187 static const struct acpi_device_id max17042_acpi_match[] = {
1188     { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
1189     { }
1190 };
1191 MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
1192 #endif
1193 
1194 #ifdef CONFIG_OF
1195 static const struct of_device_id max17042_dt_match[] = {
1196     { .compatible = "maxim,max17042" },
1197     { .compatible = "maxim,max17047" },
1198     { .compatible = "maxim,max17050" },
1199     { .compatible = "maxim,max17055" },
1200     { .compatible = "maxim,max77849-battery" },
1201     { },
1202 };
1203 MODULE_DEVICE_TABLE(of, max17042_dt_match);
1204 #endif
1205 
1206 static const struct i2c_device_id max17042_id[] = {
1207     { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1208     { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1209     { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1210     { "max17055", MAXIM_DEVICE_TYPE_MAX17055 },
1211     { "max77849-battery", MAXIM_DEVICE_TYPE_MAX17047 },
1212     { }
1213 };
1214 MODULE_DEVICE_TABLE(i2c, max17042_id);
1215 
1216 static struct i2c_driver max17042_i2c_driver = {
1217     .driver = {
1218         .name   = "max17042",
1219         .acpi_match_table = ACPI_PTR(max17042_acpi_match),
1220         .of_match_table = of_match_ptr(max17042_dt_match),
1221         .pm = &max17042_pm_ops,
1222     },
1223     .probe      = max17042_probe,
1224     .id_table   = max17042_id,
1225 };
1226 module_i2c_driver(max17042_i2c_driver);
1227 
1228 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1229 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1230 MODULE_LICENSE("GPL");
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