diff options
Diffstat (limited to 'drivers/power/supply/max1720x_battery.c')
| -rw-r--r-- | drivers/power/supply/max1720x_battery.c | 631 |
1 files changed, 631 insertions, 0 deletions
diff --git a/drivers/power/supply/max1720x_battery.c b/drivers/power/supply/max1720x_battery.c new file mode 100644 index 000000000000..ea3912fd1de8 --- /dev/null +++ b/drivers/power/supply/max1720x_battery.c @@ -0,0 +1,631 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Fuel gauge driver for Maxim 17201/17205 + * + * based on max1721x_battery.c + * + * Copyright (C) 2024 Liebherr-Electronics and Drives GmbH + */ + +#include <linux/bitfield.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/nvmem-provider.h> +#include <linux/power_supply.h> +#include <linux/regmap.h> + +#include <linux/unaligned.h> + +/* SBS compliant registers */ +#define MAX172XX_TEMP1 0x34 +#define MAX172XX_INT_TEMP 0x35 +#define MAX172XX_TEMP2 0x3B + +/* Nonvolatile registers */ +#define MAX1720X_NXTABLE0 0x80 +#define MAX1720X_NRSENSE 0xCF /* RSense in 10^-5 Ohm */ +#define MAX1720X_NDEVICE_NAME4 0xDF + +/* ModelGauge m5 */ +#define MAX172XX_STATUS 0x00 /* Status */ +#define MAX172XX_STATUS_BAT_ABSENT BIT(3) /* Battery absent */ +#define MAX172XX_STATUS_IMX BIT(6) /* Maximum Current Alert Threshold Exceeded */ +#define MAX172XX_STATUS_VMN BIT(8) /* Minimum Voltage Alert Threshold Exceeded */ +#define MAX172XX_STATUS_TMN BIT(9) /* Minimum Temperature Alert Threshold Exceeded */ +#define MAX172XX_STATUS_VMX BIT(12) /* Maximum Voltage Alert Threshold Exceeded */ +#define MAX172XX_STATUS_TMX BIT(13) /* Maximum Temperature Alert Threshold Exceeded */ +#define MAX172XX_REPCAP 0x05 /* Average capacity */ +#define MAX172XX_REPSOC 0x06 /* Percentage of charge */ +#define MAX172XX_TEMP 0x08 /* Temperature */ +#define MAX172XX_CURRENT 0x0A /* Actual current */ +#define MAX172XX_AVG_CURRENT 0x0B /* Average current */ +#define MAX172XX_FULL_CAP 0x10 /* Calculated full capacity */ +#define MAX172XX_TTE 0x11 /* Time to empty */ +#define MAX172XX_AVG_TA 0x16 /* Average temperature */ +#define MAX172XX_CYCLES 0x17 +#define MAX172XX_DESIGN_CAP 0x18 /* Design capacity */ +#define MAX172XX_AVG_VCELL 0x19 +#define MAX172XX_TTF 0x20 /* Time to full */ +#define MAX172XX_DEV_NAME 0x21 /* Device name */ +#define MAX172XX_DEV_NAME_TYPE_MASK GENMASK(3, 0) +#define MAX172XX_DEV_NAME_TYPE_MAX17201 BIT(0) +#define MAX172XX_DEV_NAME_TYPE_MAX17205 (BIT(0) | BIT(2)) +#define MAX172XX_QR_TABLE10 0x22 +#define MAX172XX_BATT 0xDA /* Battery voltage */ +#define MAX172XX_ATAVCAP 0xDF + +static const char *const max1720x_manufacturer = "Maxim Integrated"; +static const char *const max17201_model = "MAX17201"; +static const char *const max17205_model = "MAX17205"; + +struct max1720x_device_info { + struct regmap *regmap; + struct regmap *regmap_nv; + struct i2c_client *ancillary; + int rsense; +}; + +/* + * Model Gauge M5 Algorithm output register + * Volatile data (must not be cached) + */ +static const struct regmap_range max1720x_volatile_allow[] = { + regmap_reg_range(MAX172XX_STATUS, MAX172XX_CYCLES), + regmap_reg_range(MAX172XX_AVG_VCELL, MAX172XX_TTF), + regmap_reg_range(MAX172XX_QR_TABLE10, MAX172XX_ATAVCAP), +}; + +static const struct regmap_range max1720x_readable_allow[] = { + regmap_reg_range(MAX172XX_STATUS, MAX172XX_ATAVCAP), +}; + +static const struct regmap_range max1720x_readable_deny[] = { + /* unused registers */ + regmap_reg_range(0x24, 0x26), + regmap_reg_range(0x30, 0x31), + regmap_reg_range(0x33, 0x34), + regmap_reg_range(0x37, 0x37), + regmap_reg_range(0x3B, 0x3C), + regmap_reg_range(0x40, 0x41), + regmap_reg_range(0x43, 0x44), + regmap_reg_range(0x47, 0x49), + regmap_reg_range(0x4B, 0x4C), + regmap_reg_range(0x4E, 0xAF), + regmap_reg_range(0xB1, 0xB3), + regmap_reg_range(0xB5, 0xB7), + regmap_reg_range(0xBF, 0xD0), + regmap_reg_range(0xDB, 0xDB), + regmap_reg_range(0xE0, 0xFF), +}; + +static const struct regmap_access_table max1720x_readable_regs = { + .yes_ranges = max1720x_readable_allow, + .n_yes_ranges = ARRAY_SIZE(max1720x_readable_allow), + .no_ranges = max1720x_readable_deny, + .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny), +}; + +static const struct regmap_access_table max1720x_volatile_regs = { + .yes_ranges = max1720x_volatile_allow, + .n_yes_ranges = ARRAY_SIZE(max1720x_volatile_allow), + .no_ranges = max1720x_readable_deny, + .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny), +}; + +static const struct regmap_config max1720x_regmap_cfg = { + .reg_bits = 8, + .val_bits = 16, + .max_register = MAX172XX_ATAVCAP, + .val_format_endian = REGMAP_ENDIAN_LITTLE, + .rd_table = &max1720x_readable_regs, + .volatile_table = &max1720x_volatile_regs, + .cache_type = REGCACHE_MAPLE, +}; + +static const struct regmap_range max1720x_nvmem_allow[] = { + regmap_reg_range(MAX172XX_TEMP1, MAX172XX_INT_TEMP), + regmap_reg_range(MAX172XX_TEMP2, MAX172XX_TEMP2), + regmap_reg_range(MAX1720X_NXTABLE0, MAX1720X_NDEVICE_NAME4), +}; + +static const struct regmap_range max1720x_nvmem_deny[] = { + regmap_reg_range(0x00, 0x33), + regmap_reg_range(0x36, 0x3A), + regmap_reg_range(0x3C, 0x7F), + regmap_reg_range(0xE0, 0xFF), +}; + +static const struct regmap_access_table max1720x_nvmem_regs = { + .yes_ranges = max1720x_nvmem_allow, + .n_yes_ranges = ARRAY_SIZE(max1720x_nvmem_allow), + .no_ranges = max1720x_nvmem_deny, + .n_no_ranges = ARRAY_SIZE(max1720x_nvmem_deny), +}; + +static const struct regmap_config max1720x_nvmem_regmap_cfg = { + .reg_bits = 8, + .val_bits = 16, + .max_register = MAX1720X_NDEVICE_NAME4, + .val_format_endian = REGMAP_ENDIAN_LITTLE, + .rd_table = &max1720x_nvmem_regs, +}; + +static const struct nvmem_cell_info max1720x_nvmem_cells[] = { + { .name = "nXTable0", .offset = 0, .bytes = 2, }, + { .name = "nXTable1", .offset = 2, .bytes = 2, }, + { .name = "nXTable2", .offset = 4, .bytes = 2, }, + { .name = "nXTable3", .offset = 6, .bytes = 2, }, + { .name = "nXTable4", .offset = 8, .bytes = 2, }, + { .name = "nXTable5", .offset = 10, .bytes = 2, }, + { .name = "nXTable6", .offset = 12, .bytes = 2, }, + { .name = "nXTable7", .offset = 14, .bytes = 2, }, + { .name = "nXTable8", .offset = 16, .bytes = 2, }, + { .name = "nXTable9", .offset = 18, .bytes = 2, }, + { .name = "nXTable10", .offset = 20, .bytes = 2, }, + { .name = "nXTable11", .offset = 22, .bytes = 2, }, + { .name = "nUser18C", .offset = 24, .bytes = 2, }, + { .name = "nUser18D", .offset = 26, .bytes = 2, }, + { .name = "nODSCTh", .offset = 28, .bytes = 2, }, + { .name = "nODSCCfg", .offset = 30, .bytes = 2, }, + + { .name = "nOCVTable0", .offset = 32, .bytes = 2, }, + { .name = "nOCVTable1", .offset = 34, .bytes = 2, }, + { .name = "nOCVTable2", .offset = 36, .bytes = 2, }, + { .name = "nOCVTable3", .offset = 38, .bytes = 2, }, + { .name = "nOCVTable4", .offset = 40, .bytes = 2, }, + { .name = "nOCVTable5", .offset = 42, .bytes = 2, }, + { .name = "nOCVTable6", .offset = 44, .bytes = 2, }, + { .name = "nOCVTable7", .offset = 46, .bytes = 2, }, + { .name = "nOCVTable8", .offset = 48, .bytes = 2, }, + { .name = "nOCVTable9", .offset = 50, .bytes = 2, }, + { .name = "nOCVTable10", .offset = 52, .bytes = 2, }, + { .name = "nOCVTable11", .offset = 54, .bytes = 2, }, + { .name = "nIChgTerm", .offset = 56, .bytes = 2, }, + { .name = "nFilterCfg", .offset = 58, .bytes = 2, }, + { .name = "nVEmpty", .offset = 60, .bytes = 2, }, + { .name = "nLearnCfg", .offset = 62, .bytes = 2, }, + + { .name = "nQRTable00", .offset = 64, .bytes = 2, }, + { .name = "nQRTable10", .offset = 66, .bytes = 2, }, + { .name = "nQRTable20", .offset = 68, .bytes = 2, }, + { .name = "nQRTable30", .offset = 70, .bytes = 2, }, + { .name = "nCycles", .offset = 72, .bytes = 2, }, + { .name = "nFullCapNom", .offset = 74, .bytes = 2, }, + { .name = "nRComp0", .offset = 76, .bytes = 2, }, + { .name = "nTempCo", .offset = 78, .bytes = 2, }, + { .name = "nIAvgEmpty", .offset = 80, .bytes = 2, }, + { .name = "nFullCapRep", .offset = 82, .bytes = 2, }, + { .name = "nVoltTemp", .offset = 84, .bytes = 2, }, + { .name = "nMaxMinCurr", .offset = 86, .bytes = 2, }, + { .name = "nMaxMinVolt", .offset = 88, .bytes = 2, }, + { .name = "nMaxMinTemp", .offset = 90, .bytes = 2, }, + { .name = "nSOC", .offset = 92, .bytes = 2, }, + { .name = "nTimerH", .offset = 94, .bytes = 2, }, + + { .name = "nConfig", .offset = 96, .bytes = 2, }, + { .name = "nRippleCfg", .offset = 98, .bytes = 2, }, + { .name = "nMiscCfg", .offset = 100, .bytes = 2, }, + { .name = "nDesignCap", .offset = 102, .bytes = 2, }, + { .name = "nHibCfg", .offset = 104, .bytes = 2, }, + { .name = "nPackCfg", .offset = 106, .bytes = 2, }, + { .name = "nRelaxCfg", .offset = 108, .bytes = 2, }, + { .name = "nConvgCfg", .offset = 110, .bytes = 2, }, + { .name = "nNVCfg0", .offset = 112, .bytes = 2, }, + { .name = "nNVCfg1", .offset = 114, .bytes = 2, }, + { .name = "nNVCfg2", .offset = 116, .bytes = 2, }, + { .name = "nSBSCfg", .offset = 118, .bytes = 2, }, + { .name = "nROMID0", .offset = 120, .bytes = 2, }, + { .name = "nROMID1", .offset = 122, .bytes = 2, }, + { .name = "nROMID2", .offset = 124, .bytes = 2, }, + { .name = "nROMID3", .offset = 126, .bytes = 2, }, + + { .name = "nVAlrtTh", .offset = 128, .bytes = 2, }, + { .name = "nTAlrtTh", .offset = 130, .bytes = 2, }, + { .name = "nSAlrtTh", .offset = 132, .bytes = 2, }, + { .name = "nIAlrtTh", .offset = 134, .bytes = 2, }, + { .name = "nUser1C4", .offset = 136, .bytes = 2, }, + { .name = "nUser1C5", .offset = 138, .bytes = 2, }, + { .name = "nFullSOCThr", .offset = 140, .bytes = 2, }, + { .name = "nTTFCfg", .offset = 142, .bytes = 2, }, + { .name = "nCGain", .offset = 144, .bytes = 2, }, + { .name = "nTCurve", .offset = 146, .bytes = 2, }, + { .name = "nTGain", .offset = 148, .bytes = 2, }, + { .name = "nTOff", .offset = 150, .bytes = 2, }, + { .name = "nManfctrName0", .offset = 152, .bytes = 2, }, + { .name = "nManfctrName1", .offset = 154, .bytes = 2, }, + { .name = "nManfctrName2", .offset = 156, .bytes = 2, }, + { .name = "nRSense", .offset = 158, .bytes = 2, }, + + { .name = "nUser1D0", .offset = 160, .bytes = 2, }, + { .name = "nUser1D1", .offset = 162, .bytes = 2, }, + { .name = "nAgeFcCfg", .offset = 164, .bytes = 2, }, + { .name = "nDesignVoltage", .offset = 166, .bytes = 2, }, + { .name = "nUser1D4", .offset = 168, .bytes = 2, }, + { .name = "nRFastVShdn", .offset = 170, .bytes = 2, }, + { .name = "nManfctrDate", .offset = 172, .bytes = 2, }, + { .name = "nFirstUsed", .offset = 174, .bytes = 2, }, + { .name = "nSerialNumber0", .offset = 176, .bytes = 2, }, + { .name = "nSerialNumber1", .offset = 178, .bytes = 2, }, + { .name = "nSerialNumber2", .offset = 180, .bytes = 2, }, + { .name = "nDeviceName0", .offset = 182, .bytes = 2, }, + { .name = "nDeviceName1", .offset = 184, .bytes = 2, }, + { .name = "nDeviceName2", .offset = 186, .bytes = 2, }, + { .name = "nDeviceName3", .offset = 188, .bytes = 2, }, + { .name = "nDeviceName4", .offset = 190, .bytes = 2, }, +}; + +static const enum power_supply_property max1720x_battery_props[] = { + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, + POWER_SUPPLY_PROP_CHARGE_AVG, + POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, + POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CURRENT_AVG, + POWER_SUPPLY_PROP_CHARGE_FULL, + POWER_SUPPLY_PROP_MODEL_NAME, + POWER_SUPPLY_PROP_MANUFACTURER, +}; + +/* Convert regs value to power_supply units */ + +static int max172xx_time_to_ps(unsigned int reg) +{ + return reg * 5625 / 1000; /* in sec. */ +} + +static int max172xx_percent_to_ps(unsigned int reg) +{ + return reg / 256; /* in percent from 0 to 100 */ +} + +static int max172xx_voltage_to_ps(unsigned int reg) +{ + return reg * 1250; /* in uV */ +} + +static int max172xx_capacity_to_ps(unsigned int reg) +{ + return reg * 500; /* in uAh */ +} + +/* + * Current and temperature is signed values, so unsigned regs + * value must be converted to signed type + */ + +static int max172xx_temperature_to_ps(unsigned int reg) +{ + int val = (int16_t)reg; + + return val * 10 / 256; /* in tenths of deg. C */ +} + +/* + * Calculating current registers resolution: + * + * RSense stored in 10^-5 Ohm, so measurement voltage must be + * in 10^-11 Volts for get current in uA. + * 16 bit current reg fullscale +/-51.2mV is 102400 uV. + * So: 102400 / 65535 * 10^5 = 156252 + */ +static int max172xx_current_to_voltage(unsigned int reg) +{ + int val = (int16_t)reg; + + return val * 156252; +} + +static int max172xx_battery_health(struct max1720x_device_info *info, + unsigned int *health) +{ + unsigned int status; + int ret; + + ret = regmap_read(info->regmap, MAX172XX_STATUS, &status); + if (ret < 0) + return ret; + + if (status & MAX172XX_STATUS_VMN) + *health = POWER_SUPPLY_HEALTH_DEAD; + else if (status & MAX172XX_STATUS_VMX) + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else if (status & MAX172XX_STATUS_TMN) + *health = POWER_SUPPLY_HEALTH_COLD; + else if (status & MAX172XX_STATUS_TMX) + *health = POWER_SUPPLY_HEALTH_OVERHEAT; + else if (status & MAX172XX_STATUS_IMX) + *health = POWER_SUPPLY_HEALTH_OVERCURRENT; + else + *health = POWER_SUPPLY_HEALTH_GOOD; + + /* Clear events which are not self-clearing to detect next events */ + if (status > 0 && status != MAX172XX_STATUS_IMX) { + ret = regmap_set_bits(info->regmap, MAX172XX_STATUS, + MAX172XX_STATUS_VMN | + MAX172XX_STATUS_VMX | + MAX172XX_STATUS_TMN | + MAX172XX_STATUS_TMX); + if (ret < 0) + return ret; + } + + return 0; +} + +static int max1720x_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct max1720x_device_info *info = power_supply_get_drvdata(psy); + unsigned int reg_val; + int ret = 0; + + switch (psp) { + case POWER_SUPPLY_PROP_HEALTH: + ret = max172xx_battery_health(info, ®_val); + val->intval = reg_val; + break; + case POWER_SUPPLY_PROP_PRESENT: + /* + * POWER_SUPPLY_PROP_PRESENT will always readable via + * sysfs interface. Value return 0 if battery not + * present or unaccesable via I2c. + */ + ret = regmap_read(info->regmap, MAX172XX_STATUS, ®_val); + if (ret < 0) { + val->intval = 0; + return 0; + } + + val->intval = !FIELD_GET(MAX172XX_STATUS_BAT_ABSENT, reg_val); + break; + case POWER_SUPPLY_PROP_CAPACITY: + ret = regmap_read(info->regmap, MAX172XX_REPSOC, ®_val); + val->intval = max172xx_percent_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = regmap_read(info->regmap, MAX172XX_BATT, ®_val); + val->intval = max172xx_voltage_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: + ret = regmap_read(info->regmap, MAX172XX_DESIGN_CAP, ®_val); + val->intval = max172xx_capacity_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_CHARGE_AVG: + ret = regmap_read(info->regmap, MAX172XX_REPCAP, ®_val); + val->intval = max172xx_capacity_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: + ret = regmap_read(info->regmap, MAX172XX_TTE, ®_val); + val->intval = max172xx_time_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: + ret = regmap_read(info->regmap, MAX172XX_TTF, ®_val); + val->intval = max172xx_time_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_TEMP: + ret = regmap_read(info->regmap, MAX172XX_TEMP, ®_val); + val->intval = max172xx_temperature_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_CURRENT_NOW: + ret = regmap_read(info->regmap, MAX172XX_CURRENT, ®_val); + val->intval = max172xx_current_to_voltage(reg_val) / info->rsense; + break; + case POWER_SUPPLY_PROP_CURRENT_AVG: + ret = regmap_read(info->regmap, MAX172XX_AVG_CURRENT, ®_val); + val->intval = max172xx_current_to_voltage(reg_val) / info->rsense; + break; + case POWER_SUPPLY_PROP_CHARGE_FULL: + ret = regmap_read(info->regmap, MAX172XX_FULL_CAP, ®_val); + val->intval = max172xx_capacity_to_ps(reg_val); + break; + case POWER_SUPPLY_PROP_MODEL_NAME: + ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, ®_val); + reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val); + if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17201) + val->strval = max17201_model; + else if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17205) + val->strval = max17205_model; + else + return -ENODEV; + break; + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = max1720x_manufacturer; + break; + default: + return -EINVAL; + } + + return ret; +} + +static int max1720x_read_temp(struct device *dev, u8 reg, char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct max1720x_device_info *info = power_supply_get_drvdata(psy); + unsigned int val; + int ret; + + ret = regmap_read(info->regmap_nv, reg, &val); + if (ret < 0) + return ret; + + /* + * Temperature in degrees Celsius starting at absolute zero, -273C or + * 0K with an LSb of 0.1C + */ + return sysfs_emit(buf, "%d\n", val - 2730); +} + +static ssize_t temp_ain1_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_TEMP1, buf); +} + +static ssize_t temp_ain2_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_TEMP2, buf); +} + +static ssize_t temp_int_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_INT_TEMP, buf); +} + +static DEVICE_ATTR_RO(temp_ain1); +static DEVICE_ATTR_RO(temp_ain2); +static DEVICE_ATTR_RO(temp_int); + +static struct attribute *max1720x_attrs[] = { + &dev_attr_temp_ain1.attr, + &dev_attr_temp_ain2.attr, + &dev_attr_temp_int.attr, + NULL +}; +ATTRIBUTE_GROUPS(max1720x); + +static +int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len) +{ + struct max1720x_device_info *info = priv; + unsigned int reg = MAX1720X_NXTABLE0 + (off / 2); + + return regmap_bulk_read(info->regmap_nv, reg, val, len / 2); +} + +static void max1720x_unregister_ancillary(void *data) +{ + struct max1720x_device_info *info = data; + + i2c_unregister_device(info->ancillary); +} + +static int max1720x_probe_nvmem(struct i2c_client *client, + struct max1720x_device_info *info) +{ + struct device *dev = &client->dev; + struct nvmem_config nvmem_config = { + .dev = dev, + .name = "max1720x_nvmem", + .cells = max1720x_nvmem_cells, + .ncells = ARRAY_SIZE(max1720x_nvmem_cells), + .read_only = true, + .root_only = true, + .reg_read = max1720x_nvmem_reg_read, + .size = ARRAY_SIZE(max1720x_nvmem_cells) * 2, + .word_size = 2, + .stride = 2, + .priv = info, + }; + struct nvmem_device *nvmem; + unsigned int val; + int ret; + + info->ancillary = i2c_new_ancillary_device(client, "nvmem", 0xb); + if (IS_ERR(info->ancillary)) { + dev_err(dev, "Failed to initialize ancillary i2c device\n"); + return PTR_ERR(info->ancillary); + } + + ret = devm_add_action_or_reset(dev, max1720x_unregister_ancillary, info); + if (ret) { + dev_err(dev, "Failed to add unregister callback\n"); + return ret; + } + + info->regmap_nv = devm_regmap_init_i2c(info->ancillary, + &max1720x_nvmem_regmap_cfg); + if (IS_ERR(info->regmap_nv)) { + dev_err(dev, "regmap initialization of nvmem failed\n"); + return PTR_ERR(info->regmap_nv); + } + + ret = regmap_read(info->regmap_nv, MAX1720X_NRSENSE, &val); + if (ret < 0) { + dev_err(dev, "Failed to read sense resistor value\n"); + return ret; + } + + info->rsense = val; + if (!info->rsense) { + dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n"); + info->rsense = 1000; /* in regs in 10^-5 */ + } + + nvmem = devm_nvmem_register(dev, &nvmem_config); + if (IS_ERR(nvmem)) { + dev_err(dev, "Could not register nvmem!"); + return PTR_ERR(nvmem); + } + + return 0; +} + +static const struct power_supply_desc max1720x_bat_desc = { + .name = "max1720x", + .no_thermal = true, + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = max1720x_battery_props, + .num_properties = ARRAY_SIZE(max1720x_battery_props), + .get_property = max1720x_battery_get_property, +}; + +static int max1720x_probe(struct i2c_client *client) +{ + struct power_supply_config psy_cfg = {}; + struct device *dev = &client->dev; + struct max1720x_device_info *info; + struct power_supply *bat; + int ret; + + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + psy_cfg.drv_data = info; + psy_cfg.fwnode = dev_fwnode(dev); + psy_cfg.attr_grp = max1720x_groups; + i2c_set_clientdata(client, info); + info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg); + if (IS_ERR(info->regmap)) + return dev_err_probe(dev, PTR_ERR(info->regmap), + "regmap initialization failed\n"); + + ret = max1720x_probe_nvmem(client, info); + if (ret) + return dev_err_probe(dev, ret, "Failed to probe nvmem\n"); + + bat = devm_power_supply_register(dev, &max1720x_bat_desc, &psy_cfg); + if (IS_ERR(bat)) + return dev_err_probe(dev, PTR_ERR(bat), + "Failed to register power supply\n"); + + return 0; +} + +static const struct of_device_id max1720x_of_match[] = { + { .compatible = "maxim,max17201" }, + {} +}; +MODULE_DEVICE_TABLE(of, max1720x_of_match); + +static struct i2c_driver max1720x_i2c_driver = { + .driver = { + .name = "max1720x", + .of_match_table = max1720x_of_match, + }, + .probe = max1720x_probe, +}; +module_i2c_driver(max1720x_i2c_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Dimitri Fedrau <dima.fedrau@gmail.com>"); +MODULE_DESCRIPTION("Maxim MAX17201/MAX17205 Fuel Gauge IC driver"); |