diff --git a/Documentation/devicetree/bindings/power/supply/ltc4162-l.yaml b/Documentation/devicetree/bindings/power/supply/ltc4162-l.yaml index 29d53654115234..06595a9536592d 100644 --- a/Documentation/devicetree/bindings/power/supply/ltc4162-l.yaml +++ b/Documentation/devicetree/bindings/power/supply/ltc4162-l.yaml @@ -17,12 +17,18 @@ description: | panels, etc., and a rechargeable Lithium-Ion/Polymer battery. Specifications about the charger can be found at: + https://www.analog.com/en/products/ltc4162-l.html + https://www.analog.com/en/products/ltc4162-f.html https://www.analog.com/en/products/ltc4162-s.html + https://www.analog.com/en/products/ltc4015.html properties: compatible: enum: + - lltc,ltc4015 + - lltc,ltc4162-f - lltc,ltc4162-l + - lltc,ltc4162-s reg: maxItems: 1 diff --git a/drivers/power/supply/ltc4162-l-charger.c b/drivers/power/supply/ltc4162-l-charger.c index f0eace7314806c..24b62f0000cd67 100644 --- a/drivers/power/supply/ltc4162-l-charger.c +++ b/drivers/power/supply/ltc4162-l-charger.c @@ -1,9 +1,14 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* - * Driver for Analog Devices (Linear Technology) LTC4162-L charger IC. + * Driver for Analog Devices (Linear Technology) + * LTC4162-L 35V/3.2A Multi-Cell Lithium-Ion Step-Down Battery Charger + * LTC4162-F 35V/3.2A Multi-Cell LiFePO4 Step-Down Battery Charger + * LTC4162-S 35V/3.2A Lead-Acid Step-Down Battery Charger + * LTC4015 35V/3.2A Multichemistry Buck Battery Charger Controller * Copyright (C) 2020, Topic Embedded Products */ +#include #include #include #include @@ -47,6 +52,20 @@ #define LTC4162L_VBAT_FILT 0x47 #define LTC4162L_INPUT_UNDERVOLTAGE_DAC 0x4B +#define LTC4162L_CHEM_MASK GENMASK(11, 8) + +enum ltc4162_chem { + ltc4162_lad, + ltc4162_l42, + ltc4162_l41, + ltc4162_l40, + ltc4162_fad, + ltc4162_ffs, + ltc4162_fst, + ltc4162_sst = 8, + ltc4162_sad, +}; + /* Enumeration as in datasheet. Individual bits are mutually exclusive. */ enum ltc4162l_state { battery_detection = 2048, @@ -75,10 +94,28 @@ enum ltc4162l_charge_status { /* Magic number to write to ARM_SHIP_MODE register */ #define LTC4162L_ARM_SHIP_MODE_MAGIC 21325 +struct ltc4162l_info; + +struct ltc4162l_chip_info { + const char *name; + int (*get_vbat)(struct ltc4162l_info *info, unsigned int reg, + union power_supply_propval *val); + int (*get_vcharge)(struct ltc4162l_info *info, unsigned int reg, + union power_supply_propval *val); + int (*set_vcharge)(struct ltc4162l_info *info, unsigned int reg, + unsigned int value); + int (*get_die_temp)(struct ltc4162l_info *info, + union power_supply_propval *val); + unsigned int ibat_resolution_pv; + unsigned int vin_resolution_uv; + u8 telemetry_mask; +}; + struct ltc4162l_info { struct i2c_client *client; struct regmap *regmap; struct power_supply *charger; + const struct ltc4162l_chip_info *chip_info; u32 rsnsb; /* Series resistor that sets charge current, microOhm */ u32 rsnsi; /* Series resistor to measure input current, microOhm */ u8 cell_count; /* Number of connected cells, 0 while unknown */ @@ -108,6 +145,18 @@ static u8 ltc4162l_get_cell_count(struct ltc4162l_info *info) return val; }; +static u8 ltc4162l_get_chem_type(struct ltc4162l_info *info) +{ + int ret; + unsigned int val; + + ret = regmap_read(info->regmap, LTC4162L_CHEM_CELLS_REG, &val); + if (ret) + return ret; + + return FIELD_GET(LTC4162L_CHEM_MASK, val); +}; + /* Convert enum value to POWER_SUPPLY_STATUS value */ static int ltc4162l_state_decode(enum ltc4162l_state value) { @@ -223,25 +272,83 @@ static int ltc4162l_get_vbat(struct ltc4162l_info *info, unsigned int reg, union power_supply_propval *val) { - unsigned int regval; + unsigned int regval, chem_type; int ret; ret = regmap_read(info->regmap, reg, ®val); if (ret) return ret; - /* cell_count × 192.4μV/LSB */ - regval *= 1924; - regval *= ltc4162l_get_cell_count(info); - regval /= 10; - val->intval = regval; + /* + * cell_count × scaling factor + * For ltc4162-s, it uses a cell_count value of 2 for each group of 3 + * physical (2V) cells, thus will return 2, 4, 6, 8 for 6V, 12V, 18V, + * and 24V respectively, and has to divide by 2 to multiply the scale + * factor by 1, 2, 3, or 4 to represent a 6V, 12V, 18V, or 24V battery + * respectively. + */ + chem_type = ltc4162l_get_chem_type(info); + switch (chem_type) { + case ltc4162_lad ... ltc4162_fst: + regval *= 1924; + regval *= ltc4162l_get_cell_count(info); + regval /= 10; + val->intval = regval; - return 0; + return 0; + case ltc4162_sst ... ltc4162_sad: + regval *= 3848; + regval *= ltc4162l_get_cell_count(info) / 2; + regval /= 10; + val->intval = regval; + + return 0; + default: + return -EINVAL; + } +} + +static int ltc4015_get_vbat(struct ltc4162l_info *info, + unsigned int reg, + union power_supply_propval *val) +{ + unsigned int regval, chem_type; + int ret; + + ret = regmap_read(info->regmap, reg, ®val); + if (ret) + return ret; + + /* + * cell count x scaling factor + * ltc4015 lead-acid fixed and lead-acid programmable corresponds to + * 0x7 and 0x8 chem respectively + */ + chem_type = ltc4162l_get_chem_type(info); + switch (chem_type) { + case ltc4162_lad ... ltc4162_fst: + regval *= 192264; + regval *= ltc4162l_get_cell_count(info); + regval /= 1000; + val->intval = regval; + + return 0; + case ltc4162_sst - 1 ... ltc4162_sad - 1: + regval *= 128176; + regval *= ltc4162l_get_cell_count(info); + regval /= 1000; + val->intval = regval; + + return 0; + default: + return -EINVAL; + } } static int ltc4162l_get_ibat(struct ltc4162l_info *info, union power_supply_propval *val) { + const struct ltc4162l_chip_info *chip_info = info->chip_info; unsigned int regval; int ret; @@ -249,9 +356,8 @@ static int ltc4162l_get_ibat(struct ltc4162l_info *info, if (ret) return ret; - /* Signed 16-bit number, 1.466μV / RSNSB amperes/LSB. */ ret = (s16)(regval & 0xFFFF); - val->intval = 100 * mult_frac(ret, 14660, (int)info->rsnsb); + val->intval = mult_frac(ret, chip_info->ibat_resolution_pv, info->rsnsb); return 0; } @@ -260,6 +366,7 @@ static int ltc4162l_get_ibat(struct ltc4162l_info *info, static int ltc4162l_get_input_voltage(struct ltc4162l_info *info, union power_supply_propval *val) { + const struct ltc4162l_chip_info *chip_info = info->chip_info; unsigned int regval; int ret; @@ -267,8 +374,7 @@ static int ltc4162l_get_input_voltage(struct ltc4162l_info *info, if (ret) return ret; - /* 1.649mV/LSB */ - val->intval = regval * 1694; + val->intval = regval * chip_info->vin_resolution_uv; return 0; } @@ -276,6 +382,7 @@ static int ltc4162l_get_input_voltage(struct ltc4162l_info *info, static int ltc4162l_get_input_current(struct ltc4162l_info *info, union power_supply_propval *val) { + const struct ltc4162l_chip_info *chip_info = info->chip_info; unsigned int regval; int ret; @@ -283,11 +390,9 @@ static int ltc4162l_get_input_current(struct ltc4162l_info *info, if (ret) return ret; - /* Signed 16-bit number, 1.466μV / RSNSI amperes/LSB. */ ret = (s16)(regval & 0xFFFF); - ret *= 14660; + ret *= chip_info->ibat_resolution_pv; ret /= info->rsnsi; - ret *= 100; val->intval = ret; @@ -336,7 +441,7 @@ static int ltc4162l_get_vcharge(struct ltc4162l_info *info, unsigned int reg, union power_supply_propval *val) { - unsigned int regval; + unsigned int regval, chem_type; int ret; u32 voltage; @@ -348,37 +453,177 @@ static int ltc4162l_get_vcharge(struct ltc4162l_info *info, /* * charge voltage setting can be computed from - * cell_count × (vcharge_setting × 12.5mV + 3.8125V) - * where vcharge_setting ranges from 0 to 31 (4.2V max). + * cell_count × (vcharge_setting × a + b) + * where vcharge_setting ranges from 0 to c (d). + * for ltc4162l: a = 12.5mV , b = 3.8125V, c = 31, d = 4.2Vmax + * for ltc4162f: a = 12.5mV , b = 3.4125V, c = 31, d = 3.8Vmax + * + * for ltc4162s, the charge voltage setting can be computed from + * N x (vcharge_setting x 28.571mV + 6.0V) + * where N is 1, 2, 3, or 4 for 6V, 12V, 18V, or 24V battery respectively, + * and vcharge_setting ranges from 0 to 31 */ - voltage = 3812500 + (regval * 12500); - voltage *= ltc4162l_get_cell_count(info); - val->intval = voltage; + chem_type = ltc4162l_get_chem_type(info); + switch (chem_type) { + case ltc4162_lad ... ltc4162_l40: + voltage = 3812500 + (regval * 12500); + voltage *= ltc4162l_get_cell_count(info); + val->intval = voltage; - return 0; + return 0; + case ltc4162_fad ... ltc4162_fst: + voltage = 3412500 + (regval * 12500); + voltage *= ltc4162l_get_cell_count(info); + val->intval = voltage; + + return 0; + case ltc4162_sst ... ltc4162_sad: + voltage = 6000000 + (regval * 28571); + voltage *= ltc4162l_get_cell_count(info) / 2; + val->intval = voltage; + + return 0; + default: + return -EINVAL; + } } -static int ltc4162l_set_vcharge(struct ltc4162l_info *info, - unsigned int reg, - unsigned int value) +static int ltc4015_get_vcharge(struct ltc4162l_info *info, + unsigned int reg, + union power_supply_propval *val) { - u8 cell_count = ltc4162l_get_cell_count(info); + unsigned int regval, chem_type; + int ret; + u32 voltage; - if (!cell_count) - return -EBUSY; /* Not available yet, try again later */ + ret = regmap_read(info->regmap, reg, ®val); + if (ret) + return ret; + regval &= BIT(6) - 1; /* Only the lower 5 bits */ + + /* + * charge voltage setting can be computed from: + * cell_count × (vcharge_setting × a + b) + * where vcharge_setting ranges from 0 to c (d). + * Li-Ion: a = 1/80V, b = 3.8125V, c = 31, d = 4.2Vmax + * LiFePO4: a = 1/80V, b = 3.4125V, c = 31, d = 3.8Vmax + * Lead Acid: a = 1/105V, b = 2V, c = 35, d = 2.6Vmax + */ + chem_type = ltc4162l_get_chem_type(info); + switch (chem_type) { + case ltc4162_lad ... ltc4162_l40: + voltage = 3812500 + (regval * 12500); + voltage *= ltc4162l_get_cell_count(info); + val->intval = voltage; + + return 0; + case ltc4162_fad ... ltc4162_fst: + voltage = 3412500 + (regval * 12500); + voltage *= ltc4162l_get_cell_count(info); + val->intval = voltage; + + return 0; + case ltc4162_sst - 1 ... ltc4162_sad - 1: + voltage = 2000000 + mult_frac(regval, 1000000, 105); + voltage *= ltc4162l_get_cell_count(info); + val->intval = voltage; + + return 0; + default: + return -EINVAL; + } +} + +static int ltc4162l_vcharge(unsigned int base_voltage, + unsigned int scale_factor, + unsigned int range, + unsigned int value, + u8 cell_count) +{ value /= cell_count; - if (value < 3812500) + if (value < base_voltage) return -EINVAL; - value -= 3812500; - value /= 12500; + value -= base_voltage; + value /= scale_factor; - if (value > 31) + if (value > range) return -EINVAL; - return regmap_write(info->regmap, reg, value); + return value; +} + +static int ltc4162l_set_vcharge(struct ltc4162l_info *info, + unsigned int reg, + unsigned int value) +{ + unsigned int chem_type; + u8 cell_count; + + chem_type = ltc4162l_get_chem_type(info); + switch (chem_type) { + case ltc4162_lad ... ltc4162_l40: + cell_count = ltc4162l_get_cell_count(info); + if (!cell_count) + return -EBUSY; + + value = ltc4162l_vcharge(3812500, 12500, 31, value, cell_count); + return regmap_write(info->regmap, reg, value); + case ltc4162_fad ... ltc4162_fst: + cell_count = ltc4162l_get_cell_count(info); + if (!cell_count) + return -EBUSY; + + value = ltc4162l_vcharge(3412500, 12500, 31, value, cell_count); + return regmap_write(info->regmap, reg, value); + case ltc4162_sst ... ltc4162_sad: + cell_count = ltc4162l_get_cell_count(info) / 2; + if (!cell_count) + return -EBUSY; + + value = ltc4162l_vcharge(6000000, 28571, 31, value, cell_count); + return regmap_write(info->regmap, reg, value); + default: + return -EINVAL; + } +} + +static int ltc4015_set_vcharge(struct ltc4162l_info *info, + unsigned int reg, + unsigned int value) +{ + unsigned int chem_type; + u8 cell_count; + + chem_type = ltc4162l_get_chem_type(info); + switch (chem_type) { + case ltc4162_lad ... ltc4162_l40: + cell_count = ltc4162l_get_cell_count(info); + if (!cell_count) + return -EBUSY; + + value = ltc4162l_vcharge(3812500, 12500, 31, value, cell_count); + return regmap_write(info->regmap, reg, value); + case ltc4162_fad ... ltc4162_fst: + cell_count = ltc4162l_get_cell_count(info); + if (!cell_count) + return -EBUSY; + + value = ltc4162l_vcharge(3412500, 12500, 31, value, cell_count); + return regmap_write(info->regmap, reg, value); + case ltc4162_sst - 1 ... ltc4162_sad - 1: + cell_count = ltc4162l_get_cell_count(info); + if (!cell_count) + return -EBUSY; + + value = ltc4162l_vcharge(2000000, 1000000 / 105, 35, + value, cell_count); + return regmap_write(info->regmap, reg, value); + default: + return -EINVAL; + } } static int ltc4162l_get_iin_limit_dac(struct ltc4162l_info *info, @@ -437,9 +682,30 @@ static int ltc4162l_get_die_temp(struct ltc4162l_info *info, return 0; } +static int ltc4015_get_die_temp(struct ltc4162l_info *info, + union power_supply_propval *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(info->regmap, LTC4162L_DIE_TEMPERATURE, ®val); + if (ret) + return ret; + + /* (die_temp - 12010) / 45.6°C */ + ret = (s16)(regval & 0xFFFF); + ret -= 12010; + ret *= 1000; + ret /= 456; + val->intval = ret; + + return 0; +} + static int ltc4162l_get_term_current(struct ltc4162l_info *info, union power_supply_propval *val) { + const struct ltc4162l_chip_info *chip_info = info->chip_info; unsigned int regval; int ret; @@ -457,10 +723,9 @@ static int ltc4162l_get_term_current(struct ltc4162l_info *info, if (ret) return ret; - /* 1.466μV / RSNSB amperes/LSB */ - regval *= 14660u; + regval *= chip_info->ibat_resolution_pv; regval /= info->rsnsb; - val->intval = 100 * regval; + val->intval = regval; return 0; } @@ -534,10 +799,11 @@ static ssize_t vbat_show(struct device *dev, { struct power_supply *psy = to_power_supply(dev); struct ltc4162l_info *info = power_supply_get_drvdata(psy); + const struct ltc4162l_chip_info *chip_info = info->chip_info; union power_supply_propval val; int ret; - ret = ltc4162l_get_vbat(info, LTC4162L_VBAT, &val); + ret = chip_info->get_vbat(info, LTC4162L_VBAT, &val); if (ret) return ret; @@ -550,10 +816,11 @@ static ssize_t vbat_avg_show(struct device *dev, { struct power_supply *psy = to_power_supply(dev); struct ltc4162l_info *info = power_supply_get_drvdata(psy); + const struct ltc4162l_chip_info *chip_info = info->chip_info; union power_supply_propval val; int ret; - ret = ltc4162l_get_vbat(info, LTC4162L_VBAT_FILT, &val); + ret = chip_info->get_vbat(info, LTC4162L_VBAT_FILT, &val); if (ret) return ret; @@ -589,7 +856,8 @@ static ssize_t force_telemetry_show(struct device *dev, if (ret) return ret; - return sysfs_emit(buf, "%u\n", regval & BIT(2) ? 1 : 0); + return sysfs_emit(buf, "%u\n", regval & + info->chip_info->telemetry_mask ? 1 : 0); } static ssize_t force_telemetry_store(struct device *dev, @@ -607,7 +875,8 @@ static ssize_t force_telemetry_store(struct device *dev, return ret; ret = regmap_update_bits(info->regmap, LTC4162L_CONFIG_BITS_REG, - BIT(2), value ? BIT(2) : 0); + info->chip_info->telemetry_mask, + value ? info->chip_info->telemetry_mask : 0); if (ret < 0) return ret; @@ -681,6 +950,7 @@ static int ltc4162l_get_property(struct power_supply *psy, union power_supply_propval *val) { struct ltc4162l_info *info = power_supply_get_drvdata(psy); + const struct ltc4162l_chip_info *chip_info = info->chip_info; switch (psp) { case POWER_SUPPLY_PROP_STATUS: @@ -702,15 +972,13 @@ static int ltc4162l_get_property(struct power_supply *psy, return ltc4162l_get_icharge(info, LTC4162L_CHARGE_CURRENT_SETTING, val); case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: - return ltc4162l_get_vcharge(info, - LTC4162L_VCHARGE_DAC, val); + return chip_info->get_vcharge(info, LTC4162L_VCHARGE_DAC, val); case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: - return ltc4162l_get_vcharge(info, - LTC4162L_VCHARGE_SETTING, val); + return chip_info->get_vcharge(info, LTC4162L_VCHARGE_SETTING, val); case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: return ltc4162l_get_iin_limit_dac(info, val); case POWER_SUPPLY_PROP_TEMP: - return ltc4162l_get_die_temp(info, val); + return chip_info->get_die_temp(info, val); case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: return ltc4162l_get_term_current(info, val); default: @@ -772,7 +1040,6 @@ static enum power_supply_property ltc4162l_properties[] = { }; static const struct power_supply_desc ltc4162l_desc = { - .name = "ltc4162-l", .type = POWER_SUPPLY_TYPE_MAINS, .properties = ltc4162l_properties, .num_properties = ARRAY_SIZE(ltc4162l_properties), @@ -781,6 +1048,50 @@ static const struct power_supply_desc ltc4162l_desc = { .property_is_writeable = ltc4162l_property_is_writeable, }; +static const struct ltc4162l_chip_info ltc4162l_chip_info = { + .name = "ltc4162-l", + .get_vbat = ltc4162l_get_vbat, + .get_vcharge = ltc4162l_get_vcharge, + .set_vcharge = ltc4162l_set_vcharge, + .get_die_temp = ltc4162l_get_die_temp, + .ibat_resolution_pv = 1466000, + .vin_resolution_uv = 1649, + .telemetry_mask = BIT(2), +}; + +static const struct ltc4162l_chip_info ltc4162f_chip_info = { + .name = "ltc4162-f", + .get_vbat = ltc4162l_get_vbat, + .get_vcharge = ltc4162l_get_vcharge, + .set_vcharge = ltc4162l_set_vcharge, + .get_die_temp = ltc4162l_get_die_temp, + .ibat_resolution_pv = 1466000, + .vin_resolution_uv = 1649, + .telemetry_mask = BIT(2), +}; + +static const struct ltc4162l_chip_info ltc4162s_chip_info = { + .name = "ltc4162-s", + .get_vbat = ltc4162l_get_vbat, + .get_vcharge = ltc4162l_get_vcharge, + .set_vcharge = ltc4162l_set_vcharge, + .get_die_temp = ltc4162l_get_die_temp, + .ibat_resolution_pv = 1466000, + .vin_resolution_uv = 1649, + .telemetry_mask = BIT(2), +}; + +static const struct ltc4162l_chip_info ltc4015_chip_info = { + .name = "ltc4015", + .get_vbat = ltc4015_get_vbat, + .get_vcharge = ltc4015_get_vcharge, + .set_vcharge = ltc4015_set_vcharge, + .get_die_temp = ltc4015_get_die_temp, + .ibat_resolution_pv = 1464870, + .vin_resolution_uv = 1648, + .telemetry_mask = BIT(4), +}; + static bool ltc4162l_is_writeable_reg(struct device *dev, unsigned int reg) { /* all registers up to this one are writeable */ @@ -825,6 +1136,8 @@ static int ltc4162l_probe(struct i2c_client *client) struct device *dev = &client->dev; struct ltc4162l_info *info; struct power_supply_config ltc4162l_config = {}; + struct power_supply_desc *desc; + const struct ltc4162l_chip_info *chip_info; u32 value; int ret; @@ -839,6 +1152,12 @@ static int ltc4162l_probe(struct i2c_client *client) info->client = client; i2c_set_clientdata(client, info); + chip_info = i2c_get_match_data(client); + if (!chip_info) + return -ENODEV; + + info->chip_info = chip_info; + info->regmap = devm_regmap_init_i2c(client, <c4162l_regmap_config); if (IS_ERR(info->regmap)) { dev_err(dev, "Failed to initialize register map\n"); @@ -870,8 +1189,15 @@ static int ltc4162l_probe(struct i2c_client *client) ltc4162l_config.drv_data = info; ltc4162l_config.attr_grp = ltc4162l_attr_groups; - info->charger = devm_power_supply_register(dev, <c4162l_desc, - <c4162l_config); + /* Duplicate the default descriptor to set name based on chip_info. */ + desc = devm_kmemdup(dev, <c4162l_desc, + sizeof(struct power_supply_desc), GFP_KERNEL); + if (!desc) + return -ENOMEM; + + desc->name = chip_info->name; + + info->charger = devm_power_supply_register(dev, desc, <c4162l_config); if (IS_ERR(info->charger)) { dev_err(dev, "Failed to register charger\n"); return PTR_ERR(info->charger); @@ -903,14 +1229,20 @@ static void ltc4162l_alert(struct i2c_client *client, } static const struct i2c_device_id ltc4162l_i2c_id_table[] = { - { "ltc4162-l", 0 }, - { }, + { "ltc4015", (kernel_ulong_t)<c4015_chip_info }, + { "ltc4162-f", (kernel_ulong_t)<c4162f_chip_info }, + { "ltc4162-l", (kernel_ulong_t)<c4162l_chip_info }, + { "ltc4162-s", (kernel_ulong_t)<c4162s_chip_info }, + { } }; MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table); static const struct of_device_id ltc4162l_of_match[] __maybe_unused = { - { .compatible = "lltc,ltc4162-l", }, - { }, + { .compatible = "lltc,ltc4015", .data = <c4015_chip_info }, + { .compatible = "lltc,ltc4162-f", .data = <c4162f_chip_info }, + { .compatible = "lltc,ltc4162-l", .data = <c4162l_chip_info }, + { .compatible = "lltc,ltc4162-s", .data = <c4162s_chip_info }, + { } }; MODULE_DEVICE_TABLE(of, ltc4162l_of_match);