309 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.4 * Copyright (c) 2023, Linaro Limited5 */6#include <linux/delay.h>7#include <linux/i2c.h>8#include <linux/power_supply.h>9#include <linux/regmap.h>10 11#define REG_BATID 0x00 /* This one is very unclear */12 #define BATID_101 0x0101 /* 107kOhm */13 #define BATID_102 0x0102 /* 10kOhm */14#define REG_TEMPERATURE 0x0615#define REG_VOLTAGE 0x0816#define REG_FLAGS 0x0a17 #define MM8013_FLAG_OTC BIT(15)18 #define MM8013_FLAG_OTD BIT(14)19 #define MM8013_FLAG_BATHI BIT(13)20 #define MM8013_FLAG_BATLOW BIT(12)21 #define MM8013_FLAG_CHG_INH BIT(11)22 #define MM8013_FLAG_FC BIT(9)23 #define MM8013_FLAG_CHG BIT(8)24 #define MM8013_FLAG_OCC BIT(6)25 #define MM8013_FLAG_ODC BIT(5)26 #define MM8013_FLAG_OT BIT(4)27 #define MM8013_FLAG_UT BIT(3)28 #define MM8013_FLAG_DSG BIT(0)29#define REG_FULL_CHARGE_CAPACITY 0x0e30#define REG_NOMINAL_CHARGE_CAPACITY 0x0c31#define REG_AVERAGE_CURRENT 0x1432#define REG_AVERAGE_TIME_TO_EMPTY 0x1633#define REG_AVERAGE_TIME_TO_FULL 0x1834#define REG_MAX_LOAD_CURRENT 0x1e35#define REG_CYCLE_COUNT 0x2a36#define REG_STATE_OF_CHARGE 0x2c37#define REG_DESIGN_CAPACITY 0x3c38/* TODO: 0x62-0x68 seem to contain 'MM8013C' in a length-prefixed, non-terminated string */39 40#define DECIKELVIN_TO_DECIDEGC(t) (t - 2731)41 42struct mm8013_chip {43 struct i2c_client *client;44 struct regmap *regmap;45};46 47static int mm8013_checkdevice(struct mm8013_chip *chip)48{49 int battery_id, ret;50 u32 val;51 52 ret = regmap_write(chip->regmap, REG_BATID, 0x0008);53 if (ret < 0)54 return ret;55 56 ret = regmap_read(chip->regmap, REG_BATID, &val);57 if (ret < 0)58 return ret;59 60 if (val == BATID_102)61 battery_id = 2;62 else if (val == BATID_101)63 battery_id = 1;64 else65 return -EINVAL;66 67 dev_dbg(&chip->client->dev, "battery_id: %d\n", battery_id);68 69 return 0;70}71 72static enum power_supply_property mm8013_battery_props[] = {73 POWER_SUPPLY_PROP_CAPACITY,74 POWER_SUPPLY_PROP_CHARGE_FULL,75 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,76 POWER_SUPPLY_PROP_CHARGE_NOW,77 POWER_SUPPLY_PROP_CURRENT_MAX,78 POWER_SUPPLY_PROP_CURRENT_NOW,79 POWER_SUPPLY_PROP_CYCLE_COUNT,80 POWER_SUPPLY_PROP_HEALTH,81 POWER_SUPPLY_PROP_PRESENT,82 POWER_SUPPLY_PROP_STATUS,83 POWER_SUPPLY_PROP_TEMP,84 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,85 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,86 POWER_SUPPLY_PROP_VOLTAGE_NOW,87};88 89static int mm8013_get_property(struct power_supply *psy,90 enum power_supply_property psp,91 union power_supply_propval *val)92{93 struct mm8013_chip *chip = psy->drv_data;94 int ret = 0;95 u32 regval;96 97 switch (psp) {98 case POWER_SUPPLY_PROP_CAPACITY:99 ret = regmap_read(chip->regmap, REG_STATE_OF_CHARGE, ®val);100 if (ret < 0)101 return ret;102 103 val->intval = regval;104 break;105 case POWER_SUPPLY_PROP_CHARGE_FULL:106 ret = regmap_read(chip->regmap, REG_FULL_CHARGE_CAPACITY, ®val);107 if (ret < 0)108 return ret;109 110 val->intval = 1000 * regval;111 break;112 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:113 ret = regmap_read(chip->regmap, REG_DESIGN_CAPACITY, ®val);114 if (ret < 0)115 return ret;116 117 val->intval = 1000 * regval;118 break;119 case POWER_SUPPLY_PROP_CHARGE_NOW:120 ret = regmap_read(chip->regmap, REG_NOMINAL_CHARGE_CAPACITY, ®val);121 if (ret < 0)122 return ret;123 124 val->intval = 1000 * regval;125 break;126 case POWER_SUPPLY_PROP_CURRENT_MAX:127 ret = regmap_read(chip->regmap, REG_MAX_LOAD_CURRENT, ®val);128 if (ret < 0)129 return ret;130 131 val->intval = -1000 * (s16)regval;132 break;133 case POWER_SUPPLY_PROP_CURRENT_NOW:134 ret = regmap_read(chip->regmap, REG_AVERAGE_CURRENT, ®val);135 if (ret < 0)136 return ret;137 138 val->intval = -1000 * (s16)regval;139 break;140 case POWER_SUPPLY_PROP_CYCLE_COUNT:141 ret = regmap_read(chip->regmap, REG_CYCLE_COUNT, ®val);142 if (ret < 0)143 return ret;144 145 val->intval = regval;146 break;147 case POWER_SUPPLY_PROP_HEALTH:148 ret = regmap_read(chip->regmap, REG_FLAGS, ®val);149 if (ret < 0)150 return ret;151 152 if (regval & MM8013_FLAG_UT)153 val->intval = POWER_SUPPLY_HEALTH_COLD;154 else if (regval & (MM8013_FLAG_ODC | MM8013_FLAG_OCC))155 val->intval = POWER_SUPPLY_HEALTH_OVERCURRENT;156 else if (regval & (MM8013_FLAG_BATLOW))157 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;158 else if (regval & MM8013_FLAG_BATHI)159 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;160 else if (regval & (MM8013_FLAG_OT | MM8013_FLAG_OTD | MM8013_FLAG_OTC))161 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;162 else163 val->intval = POWER_SUPPLY_HEALTH_GOOD;164 break;165 case POWER_SUPPLY_PROP_PRESENT:166 ret = regmap_read(chip->regmap, REG_TEMPERATURE, ®val);167 if (ret < 0)168 return ret;169 170 val->intval = ((s16)regval > 0);171 break;172 case POWER_SUPPLY_PROP_STATUS:173 ret = regmap_read(chip->regmap, REG_FLAGS, ®val);174 if (ret < 0)175 return ret;176 177 if (regval & MM8013_FLAG_DSG)178 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;179 else if (regval & MM8013_FLAG_CHG_INH)180 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;181 else if (regval & MM8013_FLAG_CHG)182 val->intval = POWER_SUPPLY_STATUS_CHARGING;183 else if (regval & MM8013_FLAG_FC)184 val->intval = POWER_SUPPLY_STATUS_FULL;185 else186 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;187 break;188 case POWER_SUPPLY_PROP_TEMP:189 ret = regmap_read(chip->regmap, REG_TEMPERATURE, ®val);190 if (ret < 0)191 return ret;192 193 val->intval = DECIKELVIN_TO_DECIDEGC(regval);194 break;195 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:196 ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_EMPTY, ®val);197 if (ret < 0)198 return ret;199 200 /* The estimation is not yet ready */201 if (regval == U16_MAX)202 return -ENODATA;203 204 val->intval = regval;205 break;206 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:207 ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_FULL, ®val);208 if (ret < 0)209 return ret;210 211 /* The estimation is not yet ready */212 if (regval == U16_MAX)213 return -ENODATA;214 215 val->intval = regval;216 break;217 case POWER_SUPPLY_PROP_VOLTAGE_NOW:218 ret = regmap_read(chip->regmap, REG_VOLTAGE, ®val);219 if (ret < 0)220 return ret;221 222 val->intval = 1000 * regval;223 break;224 default:225 return -EINVAL;226 }227 228 return 0;229}230 231static const struct power_supply_desc mm8013_desc = {232 .name = "mm8013",233 .type = POWER_SUPPLY_TYPE_BATTERY,234 .properties = mm8013_battery_props,235 .num_properties = ARRAY_SIZE(mm8013_battery_props),236 .get_property = mm8013_get_property,237};238 239static const struct regmap_config mm8013_regmap_config = {240 .reg_bits = 8,241 .val_bits = 16,242 .max_register = 0x68,243 .use_single_read = true,244 .use_single_write = true,245 .val_format_endian = REGMAP_ENDIAN_LITTLE,246};247 248static int mm8013_probe(struct i2c_client *client)249{250 struct power_supply_config psy_cfg = {};251 struct device *dev = &client->dev;252 struct power_supply *psy;253 struct mm8013_chip *chip;254 int ret = 0;255 256 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))257 return dev_err_probe(dev, -EIO,258 "I2C_FUNC_SMBUS_WORD_DATA not supported\n");259 260 chip = devm_kzalloc(dev, sizeof(struct mm8013_chip), GFP_KERNEL);261 if (!chip)262 return -ENOMEM;263 264 chip->client = client;265 266 chip->regmap = devm_regmap_init_i2c(client, &mm8013_regmap_config);267 if (IS_ERR(chip->regmap)) {268 ret = PTR_ERR(chip->regmap);269 return dev_err_probe(dev, ret, "Couldn't initialize regmap\n");270 }271 272 ret = mm8013_checkdevice(chip);273 if (ret)274 return dev_err_probe(dev, ret, "MM8013 not found\n");275 276 psy_cfg.drv_data = chip;277 psy_cfg.of_node = dev->of_node;278 279 psy = devm_power_supply_register(dev, &mm8013_desc, &psy_cfg);280 if (IS_ERR(psy))281 return PTR_ERR(psy);282 283 return 0;284}285 286static const struct i2c_device_id mm8013_id_table[] = {287 { "mm8013" },288 {}289};290MODULE_DEVICE_TABLE(i2c, mm8013_id_table);291 292static const struct of_device_id mm8013_match_table[] = {293 { .compatible = "mitsumi,mm8013" },294 {}295};296 297static struct i2c_driver mm8013_i2c_driver = {298 .probe = mm8013_probe,299 .id_table = mm8013_id_table,300 .driver = {301 .name = "mm8013",302 .of_match_table = mm8013_match_table,303 },304};305module_i2c_driver(mm8013_i2c_driver);306 307MODULE_DESCRIPTION("MM8013 fuel gauge driver");308MODULE_LICENSE("GPL");309