| // 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 <myungjoo.ham@samsung.com> |
| // |
| // This driver is based on max17040_battery.c |
| |
| #include <linux/acpi.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/i2c.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/pm.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/power_supply.h> |
| #include <linux/power/max17042_battery.h> |
| #include <linux/of.h> |
| #include <linux/regmap.h> |
| |
| /* 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 STATUS_INTR_SOCMIN_BIT (1 << 10) |
| #define STATUS_INTR_SOCMAX_BIT (1 << 14) |
| |
| #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_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_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 |
| * contineously 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; |
| |
| val->intval = data * 1000 / 2; |
| 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; |
| |
| val->intval = sign_extend32(data, 15); |
| val->intval *= 1562500 / 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; |
| |
| val->intval = sign_extend32(data, 15); |
| val->intval *= 1562500 / chip->pdata->r_sns; |
| } else { |
| return -EINVAL; |
| } |
| 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 max10742_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 max10742_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; |
| |
| max10742_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); |
| |
| max10742_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) |
| 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 proceedure |
| * 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_MaskSOC, config->masksoc); |
| |
| max17042_override_por(map, MAX17042_FullCAP, config->fullcap); |
| max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom); |
| if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) |
| max17042_override_por(map, MAX17042_SOC_empty, |
| config->socempty); |
| max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty); |
| max17042_override_por(map, MAX17042_dQacc, config->dqacc); |
| max17042_override_por(map, MAX17042_dPacc, config->dpacc); |
| |
| if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) |
| max17042_override_por(map, MAX17042_V_empty, config->vempty); |
| else |
| max17042_override_por(map, MAX17047_V_empty, config->vempty); |
| 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); |
| max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0); |
| max17042_override_por(map, MAX17042_TempCo, config->tcompc0); |
| if (chip->chip_type) { |
| max17042_override_por(map, MAX17042_EmptyTempCo, |
| config->empty_tempco); |
| max17042_override_por(map, MAX17042_K_empty0, |
| config->kempty0); |
| } |
| } |
| |
| 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 configaration */ |
| 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 thesholds 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; |
| |
| regmap_read(chip->regmap, MAX17042_STATUS, &val); |
| if ((val & STATUS_INTR_SOCMIN_BIT) || |
| (val & STATUS_INTR_SOCMAX_BIT)) { |
| dev_info(&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_MAX17042) { |
| 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 int max17042_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
| 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_TRIGGER_FALLING | 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); |
| 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" }, |
| { }, |
| }; |
| 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 }, |
| { } |
| }; |
| 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 <myungjoo.ham@samsung.com>"); |
| MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); |
| MODULE_LICENSE("GPL"); |