// SPDX-License-Identifier: GPL-2.0 /* * Based on max77650-charger.c * * Copyright (C) 2025 Dzmitry Sankouski * * Battery charger driver for MAXIM 77705 charger/power-supply. */ #include #include #include #include #include #include #include #include #include #include static const char *max77705_charger_model = "max77705"; static const char *max77705_charger_manufacturer = "Maxim Integrated"; static const struct regmap_config max77705_chg_regmap_config = { .reg_base = MAX77705_CHG_REG_BASE, .reg_bits = 8, .val_bits = 8, .max_register = MAX77705_CHG_REG_SAFEOUT_CTRL, }; static enum power_supply_property max77705_charger_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_CHARGE_TYPE, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, }; static irqreturn_t max77705_chgin_irq(int irq, void *irq_drv_data) { struct max77705_charger_data *chg = irq_drv_data; queue_work(chg->wqueue, &chg->chgin_work); return IRQ_HANDLED; } static const struct regmap_irq max77705_charger_irqs[] = { REGMAP_IRQ_REG_LINE(MAX77705_BYP_I, BITS_PER_BYTE), REGMAP_IRQ_REG_LINE(MAX77705_INP_LIMIT_I, BITS_PER_BYTE), REGMAP_IRQ_REG_LINE(MAX77705_BATP_I, BITS_PER_BYTE), REGMAP_IRQ_REG_LINE(MAX77705_BAT_I, BITS_PER_BYTE), REGMAP_IRQ_REG_LINE(MAX77705_CHG_I, BITS_PER_BYTE), REGMAP_IRQ_REG_LINE(MAX77705_WCIN_I, BITS_PER_BYTE), REGMAP_IRQ_REG_LINE(MAX77705_CHGIN_I, BITS_PER_BYTE), REGMAP_IRQ_REG_LINE(MAX77705_AICL_I, BITS_PER_BYTE), }; static struct regmap_irq_chip max77705_charger_irq_chip = { .name = "max77705-charger", .status_base = MAX77705_CHG_REG_INT, .mask_base = MAX77705_CHG_REG_INT_MASK, .num_regs = 1, .irqs = max77705_charger_irqs, .num_irqs = ARRAY_SIZE(max77705_charger_irqs), }; static int max77705_charger_enable(struct max77705_charger_data *chg) { int rv; rv = regmap_field_write(chg->rfield[MAX77705_CHG_EN], 1); if (rv) dev_err(chg->dev, "unable to enable the charger: %d\n", rv); return rv; } static void max77705_charger_disable(void *data) { struct max77705_charger_data *chg = data; int rv; rv = regmap_field_write(chg->rfield[MAX77705_CHG_EN], MAX77705_CHG_DISABLE); if (rv) dev_err(chg->dev, "unable to disable the charger: %d\n", rv); } static int max77705_get_online(struct regmap *regmap, int *val) { unsigned int data; int ret; ret = regmap_read(regmap, MAX77705_CHG_REG_INT_OK, &data); if (ret < 0) return ret; *val = !!(data & MAX77705_CHGIN_OK); return 0; } static int max77705_set_integer(struct max77705_charger_data *chg, enum max77705_field_idx fidx, unsigned int clamp_min, unsigned int clamp_max, unsigned int div, int val) { unsigned int regval; regval = clamp_val(val, clamp_min, clamp_max) / div; return regmap_field_write(chg->rfield[fidx], regval); } static int max77705_check_battery(struct max77705_charger_data *chg, int *val) { unsigned int reg_data; unsigned int reg_data2; struct regmap *regmap = chg->regmap; regmap_read(regmap, MAX77705_CHG_REG_INT_OK, ®_data); dev_dbg(chg->dev, "CHG_INT_OK(0x%x)\n", reg_data); regmap_read(regmap, MAX77705_CHG_REG_DETAILS_00, ®_data2); dev_dbg(chg->dev, "CHG_DETAILS00(0x%x)\n", reg_data2); if ((reg_data & MAX77705_BATP_OK) || !(reg_data2 & MAX77705_BATP_DTLS)) *val = true; else *val = false; return 0; } static int max77705_get_charge_type(struct max77705_charger_data *chg, int *val) { struct regmap *regmap = chg->regmap; unsigned int reg_data, chg_en; regmap_field_read(chg->rfield[MAX77705_CHG_EN], &chg_en); if (!chg_en) { *val = POWER_SUPPLY_CHARGE_TYPE_NONE; return 0; } regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, ®_data); reg_data &= MAX77705_CHG_DTLS; switch (reg_data) { case 0x0: case MAX77705_CHARGER_CONSTANT_CURRENT: case MAX77705_CHARGER_CONSTANT_VOLTAGE: *val = POWER_SUPPLY_CHARGE_TYPE_FAST; return 0; default: *val = POWER_SUPPLY_CHARGE_TYPE_NONE; return 0; } return 0; } static int max77705_get_status(struct max77705_charger_data *chg, int *val) { struct regmap *regmap = chg->regmap; unsigned int reg_data, chg_en; regmap_field_read(chg->rfield[MAX77705_CHG_EN], &chg_en); if (!chg_en) { *val = POWER_SUPPLY_CHARGE_TYPE_NONE; return 0; } regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, ®_data); reg_data &= MAX77705_CHG_DTLS; switch (reg_data) { case 0x0: case MAX77705_CHARGER_CONSTANT_CURRENT: case MAX77705_CHARGER_CONSTANT_VOLTAGE: *val = POWER_SUPPLY_STATUS_CHARGING; return 0; case MAX77705_CHARGER_END_OF_CHARGE: case MAX77705_CHARGER_DONE: *val = POWER_SUPPLY_STATUS_FULL; return 0; /* those values hard coded as in vendor kernel, because of */ /* failure to determine it's actual meaning. */ case 0x05: case 0x06: case 0x07: *val = POWER_SUPPLY_STATUS_NOT_CHARGING; return 0; case 0x08: case 0xA: case 0xB: *val = POWER_SUPPLY_STATUS_DISCHARGING; return 0; default: *val = POWER_SUPPLY_STATUS_UNKNOWN; return 0; } return 0; } static int max77705_get_vbus_state(struct regmap *regmap, int *value) { int ret; unsigned int charge_dtls; ret = regmap_read(regmap, MAX77705_CHG_REG_DETAILS_00, &charge_dtls); if (ret) return ret; charge_dtls = ((charge_dtls & MAX77705_CHGIN_DTLS) >> MAX77705_CHGIN_DTLS_SHIFT); switch (charge_dtls) { case 0x00: *value = POWER_SUPPLY_HEALTH_UNDERVOLTAGE; break; case 0x01: *value = POWER_SUPPLY_HEALTH_UNDERVOLTAGE; break; case 0x02: *value = POWER_SUPPLY_HEALTH_OVERVOLTAGE; break; case 0x03: *value = POWER_SUPPLY_HEALTH_GOOD; break; default: return 0; } return 0; } static int max77705_get_battery_health(struct max77705_charger_data *chg, int *value) { struct regmap *regmap = chg->regmap; unsigned int bat_dtls; regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, &bat_dtls); bat_dtls = ((bat_dtls & MAX77705_BAT_DTLS) >> MAX77705_BAT_DTLS_SHIFT); switch (bat_dtls) { case MAX77705_BATTERY_NOBAT: dev_dbg(chg->dev, "%s: No battery and the chg is suspended\n", __func__); *value = POWER_SUPPLY_HEALTH_NO_BATTERY; break; case MAX77705_BATTERY_PREQUALIFICATION: dev_dbg(chg->dev, "%s: battery is okay but its voltage is low(~VPQLB)\n", __func__); break; case MAX77705_BATTERY_DEAD: dev_dbg(chg->dev, "%s: battery dead\n", __func__); *value = POWER_SUPPLY_HEALTH_DEAD; break; case MAX77705_BATTERY_GOOD: case MAX77705_BATTERY_LOWVOLTAGE: *value = POWER_SUPPLY_HEALTH_GOOD; break; case MAX77705_BATTERY_OVERVOLTAGE: dev_dbg(chg->dev, "%s: battery ovp\n", __func__); *value = POWER_SUPPLY_HEALTH_OVERVOLTAGE; break; default: dev_dbg(chg->dev, "%s: battery unknown\n", __func__); *value = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; break; } return 0; } static int max77705_get_health(struct max77705_charger_data *chg, int *val) { struct regmap *regmap = chg->regmap; int ret, is_online = 0; ret = max77705_get_online(regmap, &is_online); if (ret) return ret; if (is_online) { ret = max77705_get_vbus_state(regmap, val); if (ret || (*val != POWER_SUPPLY_HEALTH_GOOD)) return ret; } return max77705_get_battery_health(chg, val); } static int max77705_get_input_current(struct max77705_charger_data *chg, int *val) { unsigned int reg_data; int get_current = 0; regmap_field_read(chg->rfield[MAX77705_CHG_CHGIN_LIM], ®_data); if (reg_data <= 3) get_current = MAX77705_CURRENT_CHGIN_MIN; else get_current = (reg_data + 1) * MAX77705_CURRENT_CHGIN_STEP; *val = get_current; return 0; } static int max77705_get_charge_current(struct max77705_charger_data *chg, int *val) { unsigned int reg_data; regmap_field_read(chg->rfield[MAX77705_CHG_CC_LIM], ®_data); *val = reg_data <= 0x2 ? MAX77705_CURRENT_CHGIN_MIN : reg_data * MAX77705_CURRENT_CHG_STEP; return 0; } static int max77705_set_float_voltage(struct max77705_charger_data *chg, int float_voltage) { int float_voltage_mv; unsigned int reg_data = 0; float_voltage_mv = float_voltage / 1000; reg_data = float_voltage_mv <= 4000 ? 0x0 : float_voltage_mv >= 4500 ? 0x23 : (float_voltage_mv <= 4200) ? (float_voltage_mv - 4000) / 50 : (((float_voltage_mv - 4200) / 10) + 0x04); return regmap_field_write(chg->rfield[MAX77705_CHG_CV_PRM], reg_data); } static int max77705_get_float_voltage(struct max77705_charger_data *chg, int *val) { unsigned int reg_data = 0; int voltage_mv; regmap_field_read(chg->rfield[MAX77705_CHG_CV_PRM], ®_data); voltage_mv = reg_data <= 0x04 ? reg_data * 50 + 4000 : (reg_data - 4) * 10 + 4200; *val = voltage_mv * 1000; return 0; } static int max77705_chg_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max77705_charger_data *chg = power_supply_get_drvdata(psy); struct regmap *regmap = chg->regmap; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: return max77705_get_online(regmap, &val->intval); case POWER_SUPPLY_PROP_PRESENT: return max77705_check_battery(chg, &val->intval); case POWER_SUPPLY_PROP_STATUS: return max77705_get_status(chg, &val->intval); case POWER_SUPPLY_PROP_CHARGE_TYPE: return max77705_get_charge_type(chg, &val->intval); case POWER_SUPPLY_PROP_HEALTH: return max77705_get_health(chg, &val->intval); case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: return max77705_get_input_current(chg, &val->intval); case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: return max77705_get_charge_current(chg, &val->intval); case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: return max77705_get_float_voltage(chg, &val->intval); case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: val->intval = chg->bat_info->voltage_max_design_uv; break; case POWER_SUPPLY_PROP_MODEL_NAME: val->strval = max77705_charger_model; break; case POWER_SUPPLY_PROP_MANUFACTURER: val->strval = max77705_charger_manufacturer; break; default: return -EINVAL; } return 0; } static int max77705_set_property(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val) { struct max77705_charger_data *chg = power_supply_get_drvdata(psy); int err = 0; switch (psp) { case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: err = max77705_set_integer(chg, MAX77705_CHG_CC_LIM, MAX77705_CURRENT_CHGIN_MIN, MAX77705_CURRENT_CHGIN_MAX, MAX77705_CURRENT_CHG_STEP, val->intval); break; case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: err = max77705_set_integer(chg, MAX77705_CHG_CHGIN_LIM, MAX77705_CURRENT_CHGIN_MIN, MAX77705_CURRENT_CHGIN_MAX, MAX77705_CURRENT_CHGIN_STEP, val->intval); break; default: err = -EINVAL; } return err; }; static int max77705_property_is_writeable(struct power_supply *psy, enum power_supply_property psp) { switch (psp) { case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: return true; default: return false; } } static const struct power_supply_desc max77705_charger_psy_desc = { .name = "max77705-charger", .type = POWER_SUPPLY_TYPE_USB, .properties = max77705_charger_props, .property_is_writeable = max77705_property_is_writeable, .num_properties = ARRAY_SIZE(max77705_charger_props), .get_property = max77705_chg_get_property, .set_property = max77705_set_property, }; static void max77705_chgin_isr_work(struct work_struct *work) { struct max77705_charger_data *chg = container_of(work, struct max77705_charger_data, chgin_work); power_supply_changed(chg->psy_chg); } static int max77705_charger_initialize(struct max77705_charger_data *chg) { struct power_supply_battery_info *info; struct regmap *regmap = chg->regmap; int err; err = power_supply_get_battery_info(chg->psy_chg, &info); if (err) return dev_err_probe(chg->dev, err, "error on getting battery info"); chg->bat_info = info; /* unlock charger setting protect */ /* slowest LX slope */ err = regmap_field_write(chg->rfield[MAX77705_CHGPROT], MAX77705_CHGPROT_UNLOCKED); if (err) goto err; err = regmap_field_write(chg->rfield[MAX77705_LX_SLOPE], MAX77705_SLOWEST_LX_SLOPE); if (err) goto err; /* fast charge timer disable */ /* restart threshold disable */ /* pre-qual charge disable */ err = regmap_field_write(chg->rfield[MAX77705_FCHGTIME], MAX77705_FCHGTIME_DISABLE); if (err) goto err; err = regmap_field_write(chg->rfield[MAX77705_CHG_RSTRT], MAX77705_CHG_RSTRT_DISABLE); if (err) goto err; err = regmap_field_write(chg->rfield[MAX77705_CHG_PQEN], MAX77705_CHG_PQEN_DISABLE); if (err) goto err; err = regmap_field_write(chg->rfield[MAX77705_MODE], MAX77705_CHG_MASK | MAX77705_BUCK_MASK); if (err) goto err; /* charge current 450mA(default) */ /* otg current limit 900mA */ err = regmap_field_write(chg->rfield[MAX77705_OTG_ILIM], MAX77705_OTG_ILIM_900); if (err) goto err; /* BAT to SYS OCP 4.80A */ err = regmap_field_write(chg->rfield[MAX77705_REG_B2SOVRC], MAX77705_B2SOVRC_4_8A); if (err) goto err; /* top off current 150mA */ /* top off timer 30min */ err = regmap_field_write(chg->rfield[MAX77705_TO], MAX77705_TO_ITH_150MA); if (err) goto err; err = regmap_field_write(chg->rfield[MAX77705_TO_TIME], MAX77705_TO_TIME_30M); if (err) goto err; err = regmap_field_write(chg->rfield[MAX77705_SYS_TRACK], MAX77705_SYS_TRACK_DISABLE); if (err) goto err; /* cv voltage 4.2V or 4.35V */ /* MINVSYS 3.6V(default) */ if (info->voltage_max_design_uv < 0) { dev_warn(chg->dev, "missing battery:voltage-max-design-microvolt\n"); max77705_set_float_voltage(chg, 4200000); } else { max77705_set_float_voltage(chg, info->voltage_max_design_uv); } err = regmap_field_write(chg->rfield[MAX77705_VCHGIN], MAX77705_VCHGIN_4_5); if (err) goto err; err = regmap_field_write(chg->rfield[MAX77705_WCIN], MAX77705_WCIN_4_5); if (err) goto err; /* Watchdog timer */ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_00, MAX77705_WDTEN_MASK, 0); /* VBYPSET=5.0V */ err = regmap_field_write(chg->rfield[MAX77705_VBYPSET], 0); if (err) goto err; /* Switching Frequency : 1.5MHz */ err = regmap_field_write(chg->rfield[MAX77705_REG_FSW], MAX77705_CHG_FSW_1_5MHz); if (err) goto err; /* Auto skip mode */ err = regmap_field_write(chg->rfield[MAX77705_REG_DISKIP], MAX77705_AUTO_SKIP); if (err) goto err; return 0; err: return dev_err_probe(chg->dev, err, "error while configuring"); } static int max77705_charger_probe(struct i2c_client *i2c) { struct power_supply_config pscfg = {}; struct max77705_charger_data *chg; struct device *dev; struct regmap_irq_chip_data *irq_data; int ret; dev = &i2c->dev; chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL); if (!chg) return -ENOMEM; chg->dev = dev; i2c_set_clientdata(i2c, chg); chg->regmap = devm_regmap_init_i2c(i2c, &max77705_chg_regmap_config); if (IS_ERR(chg->regmap)) return PTR_ERR(chg->regmap); for (int i = 0; i < MAX77705_N_REGMAP_FIELDS; i++) { chg->rfield[i] = devm_regmap_field_alloc(dev, chg->regmap, max77705_reg_field[i]); if (IS_ERR(chg->rfield[i])) return dev_err_probe(dev, PTR_ERR(chg->rfield[i]), "cannot allocate regmap field\n"); } pscfg.fwnode = dev_fwnode(dev); pscfg.drv_data = chg; chg->psy_chg = devm_power_supply_register(dev, &max77705_charger_psy_desc, &pscfg); if (IS_ERR(chg->psy_chg)) return PTR_ERR(chg->psy_chg); max77705_charger_irq_chip.irq_drv_data = chg; ret = devm_regmap_add_irq_chip(chg->dev, chg->regmap, i2c->irq, IRQF_ONESHOT, 0, &max77705_charger_irq_chip, &irq_data); if (ret) return dev_err_probe(dev, ret, "failed to add irq chip\n"); chg->wqueue = create_singlethread_workqueue(dev_name(dev)); if (!chg->wqueue) return -ENOMEM; ret = devm_work_autocancel(dev, &chg->chgin_work, max77705_chgin_isr_work); if (ret) { dev_err_probe(dev, ret, "failed to initialize interrupt work\n"); goto destroy_wq; } ret = max77705_charger_initialize(chg); if (ret) { dev_err_probe(dev, ret, "failed to initialize charger IC\n"); goto destroy_wq; } ret = devm_request_threaded_irq(dev, regmap_irq_get_virq(irq_data, MAX77705_CHGIN_I), NULL, max77705_chgin_irq, IRQF_TRIGGER_NONE, "chgin-irq", chg); if (ret) { dev_err_probe(dev, ret, "Failed to Request chgin IRQ\n"); goto destroy_wq; } ret = max77705_charger_enable(chg); if (ret) { dev_err_probe(dev, ret, "failed to enable charge\n"); goto destroy_wq; } return devm_add_action_or_reset(dev, max77705_charger_disable, chg); destroy_wq: destroy_workqueue(chg->wqueue); return ret; } static const struct of_device_id max77705_charger_of_match[] = { { .compatible = "maxim,max77705-charger" }, { } }; MODULE_DEVICE_TABLE(of, max77705_charger_of_match); static struct i2c_driver max77705_charger_driver = { .driver = { .name = "max77705-charger", .of_match_table = max77705_charger_of_match, }, .probe = max77705_charger_probe, }; module_i2c_driver(max77705_charger_driver); MODULE_AUTHOR("Dzmitry Sankouski "); MODULE_DESCRIPTION("Maxim MAX77705 charger driver"); MODULE_LICENSE("GPL");