// SPDX-License-Identifier: GPL-2.0+ // // Fuel gauge driver for Maxim 17042 / 8966 / 8997 // Note that Maxim 8966 and 8997 are mfd and this is its subdevice. // // Copyright (C) 2011 Samsung Electronics // MyungJoo Ham // // This driver is based on max17040_battery.c #include #include #include #include #include #include #include #include #include #include #include #include #include /* Status register bits */ #define STATUS_POR_BIT (1 << 1) #define STATUS_BST_BIT (1 << 3) #define STATUS_VMN_BIT (1 << 8) #define STATUS_TMN_BIT (1 << 9) #define STATUS_SMN_BIT (1 << 10) #define STATUS_BI_BIT (1 << 11) #define STATUS_VMX_BIT (1 << 12) #define STATUS_TMX_BIT (1 << 13) #define STATUS_SMX_BIT (1 << 14) #define STATUS_BR_BIT (1 << 15) /* Interrupt mask bits */ #define CONFIG_ALRT_BIT_ENBL (1 << 2) #define VFSOC0_LOCK 0x0000 #define VFSOC0_UNLOCK 0x0080 #define MODEL_UNLOCK1 0X0059 #define MODEL_UNLOCK2 0X00C4 #define MODEL_LOCK1 0X0000 #define MODEL_LOCK2 0X0000 #define dQ_ACC_DIV 0x4 #define dP_ACC_100 0x1900 #define dP_ACC_200 0x3200 #define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */ struct max17042_chip { struct i2c_client *client; struct regmap *regmap; struct power_supply *battery; enum max170xx_chip_type chip_type; struct max17042_platform_data *pdata; struct work_struct work; int init_complete; }; static enum power_supply_property max17042_battery_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_TECHNOLOGY, POWER_SUPPLY_PROP_CYCLE_COUNT, POWER_SUPPLY_PROP_VOLTAGE_MAX, POWER_SUPPLY_PROP_VOLTAGE_MIN, POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_VOLTAGE_AVG, POWER_SUPPLY_PROP_VOLTAGE_OCV, POWER_SUPPLY_PROP_CAPACITY, POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, POWER_SUPPLY_PROP_CHARGE_FULL, POWER_SUPPLY_PROP_CHARGE_NOW, POWER_SUPPLY_PROP_CHARGE_COUNTER, POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, POWER_SUPPLY_PROP_TEMP, POWER_SUPPLY_PROP_TEMP_ALERT_MIN, POWER_SUPPLY_PROP_TEMP_ALERT_MAX, POWER_SUPPLY_PROP_TEMP_MIN, POWER_SUPPLY_PROP_TEMP_MAX, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_SCOPE, POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, // these two have to be at the end on the list POWER_SUPPLY_PROP_CURRENT_NOW, POWER_SUPPLY_PROP_CURRENT_AVG, }; static int max17042_get_temperature(struct max17042_chip *chip, int *temp) { int ret; u32 data; struct regmap *map = chip->regmap; ret = regmap_read(map, MAX17042_TEMP, &data); if (ret < 0) return ret; *temp = sign_extend32(data, 15); /* The value is converted into deci-centigrade scale */ /* Units of LSB = 1 / 256 degree Celsius */ *temp = *temp * 10 / 256; return 0; } static int max17042_get_status(struct max17042_chip *chip, int *status) { int ret, charge_full, charge_now; int avg_current; u32 data; ret = power_supply_am_i_supplied(chip->battery); if (ret < 0) { *status = POWER_SUPPLY_STATUS_UNKNOWN; return 0; } if (ret == 0) { *status = POWER_SUPPLY_STATUS_DISCHARGING; return 0; } /* * The MAX170xx has builtin end-of-charge detection and will update * FullCAP to match RepCap when it detects end of charging. * * When this cycle the battery gets charged to a higher (calculated) * capacity then the previous cycle then FullCAP will get updated * continuously once end-of-charge detection kicks in, so allow the * 2 to differ a bit. */ ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full); if (ret < 0) return ret; ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now); if (ret < 0) return ret; if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) { *status = POWER_SUPPLY_STATUS_FULL; return 0; } /* * Even though we are supplied, we may still be discharging if the * supply is e.g. only delivering 5V 0.5A. Check current if available. */ if (!chip->pdata->enable_current_sense) { *status = POWER_SUPPLY_STATUS_CHARGING; return 0; } ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data); if (ret < 0) return ret; avg_current = sign_extend32(data, 15); avg_current *= 1562500 / chip->pdata->r_sns; if (avg_current > 0) *status = POWER_SUPPLY_STATUS_CHARGING; else *status = POWER_SUPPLY_STATUS_DISCHARGING; return 0; } static int max17042_get_battery_health(struct max17042_chip *chip, int *health) { int temp, vavg, vbatt, ret; u32 val; ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val); if (ret < 0) goto health_error; /* bits [0-3] unused */ vavg = val * 625 / 8; /* Convert to millivolts */ vavg /= 1000; ret = regmap_read(chip->regmap, MAX17042_VCELL, &val); if (ret < 0) goto health_error; /* bits [0-3] unused */ vbatt = val * 625 / 8; /* Convert to millivolts */ vbatt /= 1000; if (vavg < chip->pdata->vmin) { *health = POWER_SUPPLY_HEALTH_DEAD; goto out; } if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) { *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; goto out; } ret = max17042_get_temperature(chip, &temp); if (ret < 0) goto health_error; if (temp < chip->pdata->temp_min) { *health = POWER_SUPPLY_HEALTH_COLD; goto out; } if (temp > chip->pdata->temp_max) { *health = POWER_SUPPLY_HEALTH_OVERHEAT; goto out; } *health = POWER_SUPPLY_HEALTH_GOOD; out: return 0; health_error: return ret; } static int max17042_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max17042_chip *chip = power_supply_get_drvdata(psy); struct regmap *map = chip->regmap; int ret; u32 data; u64 data64; if (!chip->init_complete) return -EAGAIN; switch (psp) { case POWER_SUPPLY_PROP_STATUS: ret = max17042_get_status(chip, &val->intval); if (ret < 0) return ret; break; case POWER_SUPPLY_PROP_PRESENT: ret = regmap_read(map, MAX17042_STATUS, &data); if (ret < 0) return ret; if (data & MAX17042_STATUS_BattAbsent) val->intval = 0; else val->intval = 1; break; case POWER_SUPPLY_PROP_TECHNOLOGY: val->intval = POWER_SUPPLY_TECHNOLOGY_LION; break; case POWER_SUPPLY_PROP_CYCLE_COUNT: ret = regmap_read(map, MAX17042_Cycles, &data); if (ret < 0) return ret; val->intval = data; break; case POWER_SUPPLY_PROP_VOLTAGE_MAX: ret = regmap_read(map, MAX17042_MinMaxVolt, &data); if (ret < 0) return ret; val->intval = data >> 8; val->intval *= 20000; /* Units of LSB = 20mV */ break; case POWER_SUPPLY_PROP_VOLTAGE_MIN: ret = regmap_read(map, MAX17042_MinMaxVolt, &data); if (ret < 0) return ret; val->intval = (data & 0xff) * 20000; /* Units of 20mV */ break; case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) ret = regmap_read(map, MAX17042_V_empty, &data); else ret = regmap_read(map, MAX17047_V_empty, &data); if (ret < 0) return ret; val->intval = data >> 7; val->intval *= 10000; /* Units of LSB = 10mV */ break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = regmap_read(map, MAX17042_VCELL, &data); if (ret < 0) return ret; val->intval = data * 625 / 8; break; case POWER_SUPPLY_PROP_VOLTAGE_AVG: ret = regmap_read(map, MAX17042_AvgVCELL, &data); if (ret < 0) return ret; val->intval = data * 625 / 8; break; case POWER_SUPPLY_PROP_VOLTAGE_OCV: ret = regmap_read(map, MAX17042_OCVInternal, &data); if (ret < 0) return ret; val->intval = data * 625 / 8; break; case POWER_SUPPLY_PROP_CAPACITY: ret = regmap_read(map, MAX17042_RepSOC, &data); if (ret < 0) return ret; val->intval = data >> 8; break; case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: ret = regmap_read(map, MAX17042_DesignCap, &data); if (ret < 0) return ret; data64 = data * 5000000ll; do_div(data64, chip->pdata->r_sns); val->intval = data64; break; case POWER_SUPPLY_PROP_CHARGE_FULL: ret = regmap_read(map, MAX17042_FullCAP, &data); if (ret < 0) return ret; data64 = data * 5000000ll; do_div(data64, chip->pdata->r_sns); val->intval = data64; break; case POWER_SUPPLY_PROP_CHARGE_NOW: ret = regmap_read(map, MAX17042_RepCap, &data); if (ret < 0) return ret; data64 = data * 5000000ll; do_div(data64, chip->pdata->r_sns); val->intval = data64; break; case POWER_SUPPLY_PROP_CHARGE_COUNTER: ret = regmap_read(map, MAX17042_QH, &data); if (ret < 0) return ret; data64 = sign_extend64(data, 15) * 5000000ll; val->intval = div_s64(data64, chip->pdata->r_sns); break; case POWER_SUPPLY_PROP_TEMP: ret = max17042_get_temperature(chip, &val->intval); if (ret < 0) return ret; break; case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: ret = regmap_read(map, MAX17042_TALRT_Th, &data); if (ret < 0) return ret; /* LSB is Alert Minimum. In deci-centigrade */ val->intval = sign_extend32(data & 0xff, 7) * 10; break; case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: ret = regmap_read(map, MAX17042_TALRT_Th, &data); if (ret < 0) return ret; /* MSB is Alert Maximum. In deci-centigrade */ val->intval = sign_extend32(data >> 8, 7) * 10; break; case POWER_SUPPLY_PROP_TEMP_MIN: val->intval = chip->pdata->temp_min; break; case POWER_SUPPLY_PROP_TEMP_MAX: val->intval = chip->pdata->temp_max; break; case POWER_SUPPLY_PROP_HEALTH: ret = max17042_get_battery_health(chip, &val->intval); if (ret < 0) return ret; break; case POWER_SUPPLY_PROP_SCOPE: val->intval = POWER_SUPPLY_SCOPE_SYSTEM; break; case POWER_SUPPLY_PROP_CURRENT_NOW: if (chip->pdata->enable_current_sense) { ret = regmap_read(map, MAX17042_Current, &data); if (ret < 0) return ret; data64 = sign_extend64(data, 15) * 1562500ll; val->intval = div_s64(data64, chip->pdata->r_sns); } else { return -EINVAL; } break; case POWER_SUPPLY_PROP_CURRENT_AVG: if (chip->pdata->enable_current_sense) { ret = regmap_read(map, MAX17042_AvgCurrent, &data); if (ret < 0) return ret; data64 = sign_extend64(data, 15) * 1562500ll; val->intval = div_s64(data64, chip->pdata->r_sns); } else { return -EINVAL; } break; case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: ret = regmap_read(map, MAX17042_ICHGTerm, &data); if (ret < 0) return ret; data64 = data * 1562500ll; val->intval = div_s64(data64, chip->pdata->r_sns); break; case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: ret = regmap_read(map, MAX17042_TTE, &data); if (ret < 0) return ret; val->intval = data * 5625 / 1000; break; default: return -EINVAL; } return 0; } static int max17042_set_property(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val) { struct max17042_chip *chip = power_supply_get_drvdata(psy); struct regmap *map = chip->regmap; int ret = 0; u32 data; int8_t temp; switch (psp) { case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: ret = regmap_read(map, MAX17042_TALRT_Th, &data); if (ret < 0) return ret; /* Input in deci-centigrade, convert to centigrade */ temp = val->intval / 10; /* force min < max */ if (temp >= (int8_t)(data >> 8)) temp = (int8_t)(data >> 8) - 1; /* Write both MAX and MIN ALERT */ data = (data & 0xff00) + temp; ret = regmap_write(map, MAX17042_TALRT_Th, data); break; case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: ret = regmap_read(map, MAX17042_TALRT_Th, &data); if (ret < 0) return ret; /* Input in Deci-Centigrade, convert to centigrade */ temp = val->intval / 10; /* force max > min */ if (temp <= (int8_t)(data & 0xff)) temp = (int8_t)(data & 0xff) + 1; /* Write both MAX and MIN ALERT */ data = (data & 0xff) + (temp << 8); ret = regmap_write(map, MAX17042_TALRT_Th, data); break; default: ret = -EINVAL; } return ret; } static int max17042_property_is_writeable(struct power_supply *psy, enum power_supply_property psp) { int ret; switch (psp) { case POWER_SUPPLY_PROP_TEMP_ALERT_MIN: case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: ret = 1; break; default: ret = 0; } return ret; } static void max17042_external_power_changed(struct power_supply *psy) { power_supply_changed(psy); } static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value) { int retries = 8; int ret; u32 read_value; do { ret = regmap_write(map, reg, value); regmap_read(map, reg, &read_value); if (read_value != value) { ret = -EIO; retries--; } } while (retries && read_value != value); if (ret < 0) pr_err("%s: err %d\n", __func__, ret); return ret; } static inline void max17042_override_por(struct regmap *map, u8 reg, u16 value) { if (value) regmap_write(map, reg, value); } static inline void max17042_unlock_model(struct max17042_chip *chip) { struct regmap *map = chip->regmap; regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1); regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2); } static inline void max17042_lock_model(struct max17042_chip *chip) { struct regmap *map = chip->regmap; regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1); regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2); } static inline void max17042_write_model_data(struct max17042_chip *chip, u8 addr, int size) { struct regmap *map = chip->regmap; int i; for (i = 0; i < size; i++) regmap_write(map, addr + i, chip->pdata->config_data->cell_char_tbl[i]); } static inline void max17042_read_model_data(struct max17042_chip *chip, u8 addr, u16 *data, int size) { struct regmap *map = chip->regmap; int i; u32 tmp; for (i = 0; i < size; i++) { regmap_read(map, addr + i, &tmp); data[i] = (u16)tmp; } } static inline int max17042_model_data_compare(struct max17042_chip *chip, u16 *data1, u16 *data2, int size) { int i; if (memcmp(data1, data2, size)) { dev_err(&chip->client->dev, "%s compare failed\n", __func__); for (i = 0; i < size; i++) dev_info(&chip->client->dev, "0x%x, 0x%x", data1[i], data2[i]); dev_info(&chip->client->dev, "\n"); return -EINVAL; } return 0; } static int max17042_init_model(struct max17042_chip *chip) { int ret; int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); u16 *temp_data; temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); if (!temp_data) return -ENOMEM; max17042_unlock_model(chip); max17042_write_model_data(chip, MAX17042_MODELChrTbl, table_size); max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, table_size); ret = max17042_model_data_compare( chip, chip->pdata->config_data->cell_char_tbl, temp_data, table_size); max17042_lock_model(chip); kfree(temp_data); return ret; } static int max17042_verify_model_lock(struct max17042_chip *chip) { int i; int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); u16 *temp_data; int ret = 0; temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); if (!temp_data) return -ENOMEM; max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, table_size); for (i = 0; i < table_size; i++) if (temp_data[i]) ret = -EINVAL; kfree(temp_data); return ret; } static void max17042_write_config_regs(struct max17042_chip *chip) { struct max17042_config_data *config = chip->pdata->config_data; struct regmap *map = chip->regmap; regmap_write(map, MAX17042_CONFIG, config->config); regmap_write(map, MAX17042_LearnCFG, config->learn_cfg); regmap_write(map, MAX17042_FilterCFG, config->filter_cfg); regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg); if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 || chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050 || chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055) regmap_write(map, MAX17047_FullSOCThr, config->full_soc_thresh); } static void max17042_write_custom_regs(struct max17042_chip *chip) { struct max17042_config_data *config = chip->pdata->config_data; struct regmap *map = chip->regmap; max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0); max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0); max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term); if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) { regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco); max17042_write_verify_reg(map, MAX17042_K_empty0, config->kempty0); } else { max17042_write_verify_reg(map, MAX17047_QRTbl00, config->qrtbl00); max17042_write_verify_reg(map, MAX17047_QRTbl10, config->qrtbl10); max17042_write_verify_reg(map, MAX17047_QRTbl20, config->qrtbl20); max17042_write_verify_reg(map, MAX17047_QRTbl30, config->qrtbl30); } } static void max17042_update_capacity_regs(struct max17042_chip *chip) { struct max17042_config_data *config = chip->pdata->config_data; struct regmap *map = chip->regmap; max17042_write_verify_reg(map, MAX17042_FullCAP, config->fullcap); regmap_write(map, MAX17042_DesignCap, config->design_cap); max17042_write_verify_reg(map, MAX17042_FullCAPNom, config->fullcapnom); } static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip) { unsigned int vfSoc; struct regmap *map = chip->regmap; regmap_read(map, MAX17042_VFSOC, &vfSoc); regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK); max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc); regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK); } static void max17042_load_new_capacity_params(struct max17042_chip *chip) { u32 full_cap0, rep_cap, dq_acc, vfSoc; u32 rem_cap; struct max17042_config_data *config = chip->pdata->config_data; struct regmap *map = chip->regmap; regmap_read(map, MAX17042_FullCAP0, &full_cap0); regmap_read(map, MAX17042_VFSOC, &vfSoc); /* fg_vfSoc needs to shifted by 8 bits to get the * perc in 1% accuracy, to get the right rem_cap multiply * full_cap0, fg_vfSoc and devide by 100 */ rem_cap = ((vfSoc >> 8) * full_cap0) / 100; max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap); rep_cap = rem_cap; max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap); /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */ dq_acc = config->fullcap / dQ_ACC_DIV; max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc); max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200); max17042_write_verify_reg(map, MAX17042_FullCAP, config->fullcap); regmap_write(map, MAX17042_DesignCap, config->design_cap); max17042_write_verify_reg(map, MAX17042_FullCAPNom, config->fullcapnom); /* Update SOC register with new SOC */ regmap_write(map, MAX17042_RepSOC, vfSoc); } /* * Block write all the override values coming from platform data. * This function MUST be called before the POR initialization procedure * specified by maxim. */ static inline void max17042_override_por_values(struct max17042_chip *chip) { struct regmap *map = chip->regmap; struct max17042_config_data *config = chip->pdata->config_data; max17042_override_por(map, MAX17042_TGAIN, config->tgain); max17042_override_por(map, MAX17042_TOFF, config->toff); max17042_override_por(map, MAX17042_CGAIN, config->cgain); max17042_override_por(map, MAX17042_COFF, config->coff); max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh); max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh); max17042_override_por(map, MAX17042_SALRT_Th, config->soc_alrt_thresh); max17042_override_por(map, MAX17042_CONFIG, config->config); max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer); max17042_override_por(map, MAX17042_DesignCap, config->design_cap); max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term); max17042_override_por(map, MAX17042_AtRate, config->at_rate); max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg); max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg); max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg); max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg); max17042_override_por(map, MAX17042_FullCAP, config->fullcap); max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom); max17042_override_por(map, MAX17042_dQacc, config->dqacc); max17042_override_por(map, MAX17042_dPacc, config->dpacc); max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0); max17042_override_por(map, MAX17042_TempCo, config->tcompc0); if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) { max17042_override_por(map, MAX17042_MaskSOC, config->masksoc); max17042_override_por(map, MAX17042_SOC_empty, config->socempty); max17042_override_por(map, MAX17042_V_empty, config->vempty); max17042_override_por(map, MAX17042_EmptyTempCo, config->empty_tempco); max17042_override_por(map, MAX17042_K_empty0, config->kempty0); } if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) || (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) || (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) { max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty); max17042_override_por(map, MAX17042_TempNom, config->temp_nom); max17042_override_por(map, MAX17042_TempLim, config->temp_lim); max17042_override_por(map, MAX17042_FCTC, config->fctc); } if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) || (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050) || (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)) { max17042_override_por(map, MAX17047_V_empty, config->vempty); } } static int max17042_init_chip(struct max17042_chip *chip) { struct regmap *map = chip->regmap; int ret; max17042_override_por_values(chip); /* After Power up, the MAX17042 requires 500mS in order * to perform signal debouncing and initial SOC reporting */ msleep(500); /* Initialize configuration */ max17042_write_config_regs(chip); /* write cell characterization data */ ret = max17042_init_model(chip); if (ret) { dev_err(&chip->client->dev, "%s init failed\n", __func__); return -EIO; } ret = max17042_verify_model_lock(chip); if (ret) { dev_err(&chip->client->dev, "%s lock verify failed\n", __func__); return -EIO; } /* write custom parameters */ max17042_write_custom_regs(chip); /* update capacity params */ max17042_update_capacity_regs(chip); /* delay must be atleast 350mS to allow VFSOC * to be calculated from the new configuration */ msleep(350); /* reset vfsoc0 reg */ max17042_reset_vfsoc0_reg(chip); /* load new capacity params */ max17042_load_new_capacity_params(chip); /* Init complete, Clear the POR bit */ regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0); return 0; } static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off) { struct regmap *map = chip->regmap; u32 soc, soc_tr; /* program interrupt thresholds such that we should * get interrupt for every 'off' perc change in the soc */ regmap_read(map, MAX17042_RepSOC, &soc); soc >>= 8; soc_tr = (soc + off) << 8; soc_tr |= (soc - off); regmap_write(map, MAX17042_SALRT_Th, soc_tr); } static irqreturn_t max17042_thread_handler(int id, void *dev) { struct max17042_chip *chip = dev; u32 val; int ret; ret = regmap_read(chip->regmap, MAX17042_STATUS, &val); if (ret) return IRQ_HANDLED; if ((val & STATUS_SMN_BIT) || (val & STATUS_SMX_BIT)) { dev_dbg(&chip->client->dev, "SOC threshold INTR\n"); max17042_set_soc_threshold(chip, 1); } power_supply_changed(chip->battery); return IRQ_HANDLED; } static void max17042_init_worker(struct work_struct *work) { struct max17042_chip *chip = container_of(work, struct max17042_chip, work); int ret; /* Initialize registers according to values from the platform data */ if (chip->pdata->enable_por_init && chip->pdata->config_data) { ret = max17042_init_chip(chip); if (ret) return; } chip->init_complete = 1; } #ifdef CONFIG_OF static struct max17042_platform_data * max17042_get_of_pdata(struct max17042_chip *chip) { struct device *dev = &chip->client->dev; struct device_node *np = dev->of_node; u32 prop; struct max17042_platform_data *pdata; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return NULL; /* * Require current sense resistor value to be specified for * current-sense functionality to be enabled at all. */ if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) { pdata->r_sns = prop; pdata->enable_current_sense = true; } if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min)) pdata->temp_min = INT_MIN; if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max)) pdata->temp_max = INT_MAX; if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin)) pdata->vmin = INT_MIN; if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax)) pdata->vmax = INT_MAX; return pdata; } #endif static struct max17042_reg_data max17047_default_pdata_init_regs[] = { /* * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection * when the voltage FG reports 95%, as recommended in the datasheet. */ { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 }, }; static struct max17042_platform_data * max17042_get_default_pdata(struct max17042_chip *chip) { struct device *dev = &chip->client->dev; struct max17042_platform_data *pdata; int ret, misc_cfg; /* * The MAX17047 gets used on x86 where we might not have pdata, assume * the firmware will already have initialized the fuel-gauge and provide * default values for the non init bits to make things work. */ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return pdata; if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) || (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) { pdata->init_data = max17047_default_pdata_init_regs; pdata->num_init_data = ARRAY_SIZE(max17047_default_pdata_init_regs); } ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg); if (ret < 0) return NULL; /* If bits 0-1 are set to 3 then only Voltage readings are used */ if ((misc_cfg & 0x3) == 0x3) pdata->enable_current_sense = false; else pdata->enable_current_sense = true; pdata->vmin = MAX17042_DEFAULT_VMIN; pdata->vmax = MAX17042_DEFAULT_VMAX; pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN; pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX; return pdata; } static struct max17042_platform_data * max17042_get_pdata(struct max17042_chip *chip) { struct device *dev = &chip->client->dev; #ifdef CONFIG_OF if (dev->of_node) return max17042_get_of_pdata(chip); #endif if (dev->platform_data) return dev->platform_data; return max17042_get_default_pdata(chip); } static const struct regmap_config max17042_regmap_config = { .reg_bits = 8, .val_bits = 16, .val_format_endian = REGMAP_ENDIAN_NATIVE, }; static const struct power_supply_desc max17042_psy_desc = { .name = "max170xx_battery", .type = POWER_SUPPLY_TYPE_BATTERY, .get_property = max17042_get_property, .set_property = max17042_set_property, .property_is_writeable = max17042_property_is_writeable, .external_power_changed = max17042_external_power_changed, .properties = max17042_battery_props, .num_properties = ARRAY_SIZE(max17042_battery_props), }; static const struct power_supply_desc max17042_no_current_sense_psy_desc = { .name = "max170xx_battery", .type = POWER_SUPPLY_TYPE_BATTERY, .get_property = max17042_get_property, .set_property = max17042_set_property, .property_is_writeable = max17042_property_is_writeable, .properties = max17042_battery_props, .num_properties = ARRAY_SIZE(max17042_battery_props) - 2, }; static void max17042_stop_work(void *data) { struct max17042_chip *chip = data; cancel_work_sync(&chip->work); } static int max17042_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = client->adapter; const struct power_supply_desc *max17042_desc = &max17042_psy_desc; struct power_supply_config psy_cfg = {}; const struct acpi_device_id *acpi_id = NULL; struct device *dev = &client->dev; struct max17042_chip *chip; int ret; int i; u32 val; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) return -EIO; chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; chip->client = client; if (id) { chip->chip_type = id->driver_data; } else { acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev); if (!acpi_id) return -ENODEV; chip->chip_type = acpi_id->driver_data; } chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config); if (IS_ERR(chip->regmap)) { dev_err(&client->dev, "Failed to initialize regmap\n"); return -EINVAL; } chip->pdata = max17042_get_pdata(chip); if (!chip->pdata) { dev_err(&client->dev, "no platform data provided\n"); return -EINVAL; } i2c_set_clientdata(client, chip); psy_cfg.drv_data = chip; psy_cfg.of_node = dev->of_node; /* When current is not measured, * CURRENT_NOW and CURRENT_AVG properties should be invisible. */ if (!chip->pdata->enable_current_sense) max17042_desc = &max17042_no_current_sense_psy_desc; if (chip->pdata->r_sns == 0) chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR; if (chip->pdata->init_data) for (i = 0; i < chip->pdata->num_init_data; i++) regmap_write(chip->regmap, chip->pdata->init_data[i].addr, chip->pdata->init_data[i].data); if (!chip->pdata->enable_current_sense) { regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000); regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003); regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007); } chip->battery = devm_power_supply_register(&client->dev, max17042_desc, &psy_cfg); if (IS_ERR(chip->battery)) { dev_err(&client->dev, "failed: power supply register\n"); return PTR_ERR(chip->battery); } if (client->irq) { unsigned int flags = IRQF_ONESHOT; /* * On ACPI systems the IRQ may be handled by ACPI-event code, * so we need to share (if the ACPI code is willing to share). */ if (acpi_id) flags |= IRQF_SHARED | IRQF_PROBE_SHARED; ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, max17042_thread_handler, flags, chip->battery->desc->name, chip); if (!ret) { regmap_update_bits(chip->regmap, MAX17042_CONFIG, CONFIG_ALRT_BIT_ENBL, CONFIG_ALRT_BIT_ENBL); max17042_set_soc_threshold(chip, 1); } else { client->irq = 0; if (ret != -EBUSY) dev_err(&client->dev, "Failed to get IRQ\n"); } } /* Not able to update the charge threshold when exceeded? -> disable */ if (!client->irq) regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00); regmap_read(chip->regmap, MAX17042_STATUS, &val); if (val & STATUS_POR_BIT) { INIT_WORK(&chip->work, max17042_init_worker); ret = devm_add_action(&client->dev, max17042_stop_work, chip); if (ret) return ret; schedule_work(&chip->work); } else { chip->init_complete = 1; } return 0; } #ifdef CONFIG_PM_SLEEP static int max17042_suspend(struct device *dev) { struct max17042_chip *chip = dev_get_drvdata(dev); /* * disable the irq and enable irq_wake * capability to the interrupt line. */ if (chip->client->irq) { disable_irq(chip->client->irq); enable_irq_wake(chip->client->irq); } return 0; } static int max17042_resume(struct device *dev) { struct max17042_chip *chip = dev_get_drvdata(dev); if (chip->client->irq) { disable_irq_wake(chip->client->irq); enable_irq(chip->client->irq); /* re-program the SOC thresholds to 1% change */ max17042_set_soc_threshold(chip, 1); } return 0; } #endif static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend, max17042_resume); #ifdef CONFIG_ACPI static const struct acpi_device_id max17042_acpi_match[] = { { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 }, { } }; MODULE_DEVICE_TABLE(acpi, max17042_acpi_match); #endif #ifdef CONFIG_OF static const struct of_device_id max17042_dt_match[] = { { .compatible = "maxim,max17042" }, { .compatible = "maxim,max17047" }, { .compatible = "maxim,max17050" }, { .compatible = "maxim,max17055" }, { .compatible = "maxim,max77849-battery" }, { }, }; MODULE_DEVICE_TABLE(of, max17042_dt_match); #endif static const struct i2c_device_id max17042_id[] = { { "max17042", MAXIM_DEVICE_TYPE_MAX17042 }, { "max17047", MAXIM_DEVICE_TYPE_MAX17047 }, { "max17050", MAXIM_DEVICE_TYPE_MAX17050 }, { "max17055", MAXIM_DEVICE_TYPE_MAX17055 }, { "max77849-battery", MAXIM_DEVICE_TYPE_MAX17047 }, { } }; MODULE_DEVICE_TABLE(i2c, max17042_id); static struct i2c_driver max17042_i2c_driver = { .driver = { .name = "max17042", .acpi_match_table = ACPI_PTR(max17042_acpi_match), .of_match_table = of_match_ptr(max17042_dt_match), .pm = &max17042_pm_ops, }, .probe = max17042_probe, .id_table = max17042_id, }; module_i2c_driver(max17042_i2c_driver); MODULE_AUTHOR("MyungJoo Ham "); MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); MODULE_LICENSE("GPL");