// SPDX-License-Identifier: GPL-2.0-only /* * Battery charger driver for RT5033 * * Copyright (C) 2014 Samsung Electronics, Co., Ltd. * Author: Beomho Seo */ #include #include #include #include #include #include struct rt5033_charger_data { unsigned int pre_uamp; unsigned int pre_uvolt; unsigned int const_uvolt; unsigned int eoc_uamp; unsigned int fast_uamp; }; struct rt5033_charger { struct device *dev; struct regmap *regmap; struct power_supply *psy; struct rt5033_charger_data *chg; }; static int rt5033_get_charger_state(struct rt5033_charger *charger) { struct regmap *regmap = charger->regmap; unsigned int reg_data; int state; if (!regmap) return POWER_SUPPLY_STATUS_UNKNOWN; regmap_read(regmap, RT5033_REG_CHG_STAT, ®_data); switch (reg_data & RT5033_CHG_STAT_MASK) { case RT5033_CHG_STAT_DISCHARGING: state = POWER_SUPPLY_STATUS_DISCHARGING; break; case RT5033_CHG_STAT_CHARGING: state = POWER_SUPPLY_STATUS_CHARGING; break; case RT5033_CHG_STAT_FULL: state = POWER_SUPPLY_STATUS_FULL; break; case RT5033_CHG_STAT_NOT_CHARGING: state = POWER_SUPPLY_STATUS_NOT_CHARGING; break; default: state = POWER_SUPPLY_STATUS_UNKNOWN; } return state; } static int rt5033_get_charger_type(struct rt5033_charger *charger) { struct regmap *regmap = charger->regmap; unsigned int reg_data; int state; regmap_read(regmap, RT5033_REG_CHG_STAT, ®_data); switch (reg_data & RT5033_CHG_STAT_TYPE_MASK) { case RT5033_CHG_STAT_TYPE_FAST: state = POWER_SUPPLY_CHARGE_TYPE_FAST; break; case RT5033_CHG_STAT_TYPE_PRE: state = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; break; default: state = POWER_SUPPLY_CHARGE_TYPE_NONE; } return state; } static int rt5033_get_charger_current_limit(struct rt5033_charger *charger) { struct regmap *regmap = charger->regmap; unsigned int state, reg_data, data; regmap_read(regmap, RT5033_REG_CHG_CTRL5, ®_data); state = (reg_data & RT5033_CHGCTRL5_ICHG_MASK) >> RT5033_CHGCTRL5_ICHG_SHIFT; data = RT5033_CHARGER_FAST_CURRENT_MIN + RT5033_CHARGER_FAST_CURRENT_STEP_NUM * state; return data; } static int rt5033_get_charger_const_voltage(struct rt5033_charger *charger) { struct regmap *regmap = charger->regmap; unsigned int state, reg_data, data; regmap_read(regmap, RT5033_REG_CHG_CTRL2, ®_data); state = (reg_data & RT5033_CHGCTRL2_CV_MASK) >> RT5033_CHGCTRL2_CV_SHIFT; data = RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN + RT5033_CHARGER_CONST_VOLTAGE_STEP_NUM * state; return data; } static inline int rt5033_init_const_charge(struct rt5033_charger *charger) { struct rt5033_charger_data *chg = charger->chg; int ret; unsigned int val; u8 reg_data; /* Set constant voltage mode */ if (chg->const_uvolt < RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN || chg->const_uvolt > RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX) { dev_err(charger->dev, "Value 'constant-charge-voltage-max-microvolt' out of range\n"); return -EINVAL; } if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN) reg_data = 0x00; else if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX) reg_data = RT5033_CV_MAX_VOLTAGE; else { val = chg->const_uvolt; val -= RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN; val /= RT5033_CHARGER_CONST_VOLTAGE_STEP_NUM; reg_data = val; } ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2, RT5033_CHGCTRL2_CV_MASK, reg_data << RT5033_CHGCTRL2_CV_SHIFT); if (ret) { dev_err(charger->dev, "Failed regmap update\n"); return -EINVAL; } /* Set end of charge current */ if (chg->eoc_uamp < RT5033_CHARGER_EOC_MIN || chg->eoc_uamp > RT5033_CHARGER_EOC_MAX) { dev_err(charger->dev, "Value 'charge-term-current-microamp' out of range\n"); return -EINVAL; } if (chg->eoc_uamp == RT5033_CHARGER_EOC_MIN) reg_data = 0x01; else if (chg->eoc_uamp == RT5033_CHARGER_EOC_MAX) reg_data = 0x07; else { val = chg->eoc_uamp; if (val < RT5033_CHARGER_EOC_REF) { val -= RT5033_CHARGER_EOC_MIN; val /= RT5033_CHARGER_EOC_STEP_NUM1; reg_data = 0x01 + val; } else if (val > RT5033_CHARGER_EOC_REF) { val -= RT5033_CHARGER_EOC_REF; val /= RT5033_CHARGER_EOC_STEP_NUM2; reg_data = 0x04 + val; } else { reg_data = 0x04; } } ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4, RT5033_CHGCTRL4_EOC_MASK, reg_data); if (ret) { dev_err(charger->dev, "Failed regmap update\n"); return -EINVAL; } return 0; } static inline int rt5033_init_fast_charge(struct rt5033_charger *charger) { struct rt5033_charger_data *chg = charger->chg; int ret; unsigned int val; u8 reg_data; /* Set limit input current */ ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1, RT5033_CHGCTRL1_IAICR_MASK, RT5033_AICR_2000_MODE); if (ret) { dev_err(charger->dev, "Failed regmap update\n"); return -EINVAL; } /* Set fast-charge mode charging current */ if (chg->fast_uamp < RT5033_CHARGER_FAST_CURRENT_MIN || chg->fast_uamp > RT5033_CHARGER_FAST_CURRENT_MAX) { dev_err(charger->dev, "Value 'constant-charge-current-max-microamp' out of range\n"); return -EINVAL; } if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MIN) reg_data = 0x00; else if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MAX) reg_data = RT5033_CHG_MAX_CURRENT; else { val = chg->fast_uamp; val -= RT5033_CHARGER_FAST_CURRENT_MIN; val /= RT5033_CHARGER_FAST_CURRENT_STEP_NUM; reg_data = val; } ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5, RT5033_CHGCTRL5_ICHG_MASK, reg_data << RT5033_CHGCTRL5_ICHG_SHIFT); if (ret) { dev_err(charger->dev, "Failed regmap update\n"); return -EINVAL; } return 0; } static inline int rt5033_init_pre_charge(struct rt5033_charger *charger) { struct rt5033_charger_data *chg = charger->chg; int ret; unsigned int val; u8 reg_data; /* Set pre-charge threshold voltage */ if (chg->pre_uvolt < RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN || chg->pre_uvolt > RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX) { dev_err(charger->dev, "Value 'precharge-upper-limit-microvolt' out of range\n"); return -EINVAL; } if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN) reg_data = 0x00; else if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX) reg_data = 0x0f; else { val = chg->pre_uvolt; val -= RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN; val /= RT5033_CHARGER_PRE_THRESHOLD_STEP_NUM; reg_data = val; } ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5, RT5033_CHGCTRL5_VPREC_MASK, reg_data); if (ret) { dev_err(charger->dev, "Failed regmap update\n"); return -EINVAL; } /* Set pre-charge mode charging current */ if (chg->pre_uamp < RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN || chg->pre_uamp > RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX) { dev_err(charger->dev, "Value 'precharge-current-microamp' out of range\n"); return -EINVAL; } if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN) reg_data = 0x00; else if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX) reg_data = RT5033_CHG_MAX_PRE_CURRENT; else { val = chg->pre_uamp; val -= RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN; val /= RT5033_CHARGER_PRE_CURRENT_STEP_NUM; reg_data = val; } ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4, RT5033_CHGCTRL4_IPREC_MASK, reg_data << RT5033_CHGCTRL4_IPREC_SHIFT); if (ret) { dev_err(charger->dev, "Failed regmap update\n"); return -EINVAL; } return 0; } static int rt5033_charger_reg_init(struct rt5033_charger *charger) { int ret = 0; /* Enable charging termination */ ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1, RT5033_CHGCTRL1_TE_EN_MASK, RT5033_TE_ENABLE); if (ret) { dev_err(charger->dev, "Failed to enable charging termination.\n"); return -EINVAL; } /* * Disable minimum input voltage regulation (MIVR), this improves * the charging performance. */ ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4, RT5033_CHGCTRL4_MIVR_MASK, RT5033_CHARGER_MIVR_DISABLE); if (ret) { dev_err(charger->dev, "Failed to disable MIVR.\n"); return -EINVAL; } ret = rt5033_init_pre_charge(charger); if (ret) return ret; ret = rt5033_init_fast_charge(charger); if (ret) return ret; ret = rt5033_init_const_charge(charger); if (ret) return ret; return 0; } static enum power_supply_property rt5033_charger_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_CHARGE_TYPE, POWER_SUPPLY_PROP_CURRENT_MAX, POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER, POWER_SUPPLY_PROP_ONLINE, }; static int rt5033_charger_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct rt5033_charger *charger = power_supply_get_drvdata(psy); switch (psp) { case POWER_SUPPLY_PROP_STATUS: val->intval = rt5033_get_charger_state(charger); break; case POWER_SUPPLY_PROP_CHARGE_TYPE: val->intval = rt5033_get_charger_type(charger); break; case POWER_SUPPLY_PROP_CURRENT_MAX: val->intval = rt5033_get_charger_current_limit(charger); break; case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: val->intval = rt5033_get_charger_const_voltage(charger); break; case POWER_SUPPLY_PROP_MODEL_NAME: val->strval = RT5033_CHARGER_MODEL; break; case POWER_SUPPLY_PROP_MANUFACTURER: val->strval = RT5033_MANUFACTURER; break; case POWER_SUPPLY_PROP_ONLINE: val->intval = (rt5033_get_charger_state(charger) == POWER_SUPPLY_STATUS_CHARGING); break; default: return -EINVAL; } return 0; } static struct rt5033_charger_data *rt5033_charger_dt_init( struct rt5033_charger *charger) { struct rt5033_charger_data *chg; struct power_supply_battery_info *info; int ret; chg = devm_kzalloc(charger->dev, sizeof(*chg), GFP_KERNEL); if (!chg) return ERR_PTR(-ENOMEM); ret = power_supply_get_battery_info(charger->psy, &info); if (ret) return ERR_PTR(dev_err_probe(charger->dev, -EINVAL, "missing battery info\n")); /* Assign data. Validity will be checked in the init functions. */ chg->pre_uamp = info->precharge_current_ua; chg->fast_uamp = info->constant_charge_current_max_ua; chg->eoc_uamp = info->charge_term_current_ua; chg->pre_uvolt = info->precharge_voltage_max_uv; chg->const_uvolt = info->constant_charge_voltage_max_uv; return chg; } static const struct power_supply_desc rt5033_charger_desc = { .name = "rt5033-charger", .type = POWER_SUPPLY_TYPE_USB, .properties = rt5033_charger_props, .num_properties = ARRAY_SIZE(rt5033_charger_props), .get_property = rt5033_charger_get_property, }; static int rt5033_charger_probe(struct platform_device *pdev) { struct rt5033_charger *charger; struct power_supply_config psy_cfg = {}; int ret; charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); if (!charger) return -ENOMEM; platform_set_drvdata(pdev, charger); charger->dev = &pdev->dev; charger->regmap = dev_get_regmap(pdev->dev.parent, NULL); psy_cfg.of_node = pdev->dev.of_node; psy_cfg.drv_data = charger; charger->psy = devm_power_supply_register(&pdev->dev, &rt5033_charger_desc, &psy_cfg); if (IS_ERR(charger->psy)) return dev_err_probe(&pdev->dev, PTR_ERR(charger->psy), "Failed to register power supply\n"); charger->chg = rt5033_charger_dt_init(charger); if (IS_ERR_OR_NULL(charger->chg)) return PTR_ERR(charger->chg); ret = rt5033_charger_reg_init(charger); if (ret) return ret; return 0; } static const struct platform_device_id rt5033_charger_id[] = { { "rt5033-charger", }, { } }; MODULE_DEVICE_TABLE(platform, rt5033_charger_id); static const struct of_device_id rt5033_charger_of_match[] = { { .compatible = "richtek,rt5033-charger", }, { } }; MODULE_DEVICE_TABLE(of, rt5033_charger_of_match); static struct platform_driver rt5033_charger_driver = { .driver = { .name = "rt5033-charger", .of_match_table = rt5033_charger_of_match, }, .probe = rt5033_charger_probe, .id_table = rt5033_charger_id, }; module_platform_driver(rt5033_charger_driver); MODULE_DESCRIPTION("Richtek RT5033 charger driver"); MODULE_AUTHOR("Beomho Seo "); MODULE_LICENSE("GPL v2");