/* * Battery charger driver for the Maxim 14577 * * Copyright (C) 2013 Samsung Electronics * Krzysztof Kozlowski * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include struct max14577_charger { struct device *dev; struct max14577 *max14577; struct power_supply charger; unsigned int charging_state; unsigned int battery_state; }; static int max14577_get_charger_state(struct max14577_charger *chg) { struct regmap *rmap = chg->max14577->regmap; int state = POWER_SUPPLY_STATUS_DISCHARGING; u8 reg_data; /* * Charging occurs only if: * - CHGCTRL2/MBCHOSTEN == 1 * - STATUS2/CGMBC == 1 * * TODO: * - handle FULL after Top-off timer (EOC register may be off * and the charger won't be charging although MBCHOSTEN is on) * - handle properly dead-battery charging (respect timer) * - handle timers (fast-charge and prequal) /MBCCHGERR/ */ max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) goto state_set; max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); if (reg_data & STATUS3_CGMBC_MASK) { /* Charger or USB-cable is connected */ if (reg_data & STATUS3_EOC_MASK) state = POWER_SUPPLY_STATUS_FULL; else state = POWER_SUPPLY_STATUS_CHARGING; goto state_set; } state_set: chg->charging_state = state; return state; } /* * Supported charge types: * - POWER_SUPPLY_CHARGE_TYPE_NONE * - POWER_SUPPLY_CHARGE_TYPE_FAST */ static int max14577_get_charge_type(struct max14577_charger *chg) { /* * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)? * As spec says: * [after reaching EOC interrupt] * "When the battery is fully charged, the 30-minute (typ) * top-off timer starts. The device continues to trickle * charge the battery until the top-off timer runs out." */ if (max14577_get_charger_state(chg) == POWER_SUPPLY_STATUS_CHARGING) return POWER_SUPPLY_CHARGE_TYPE_FAST; return POWER_SUPPLY_CHARGE_TYPE_NONE; } static int max14577_get_online(struct max14577_charger *chg) { struct regmap *rmap = chg->max14577->regmap; u8 reg_data; max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data); reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT); switch (reg_data) { case MAX14577_CHARGER_TYPE_USB: case MAX14577_CHARGER_TYPE_DEDICATED_CHG: case MAX14577_CHARGER_TYPE_SPECIAL_500MA: case MAX14577_CHARGER_TYPE_SPECIAL_1A: case MAX14577_CHARGER_TYPE_DEAD_BATTERY: return 1; case MAX14577_CHARGER_TYPE_NONE: case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: case MAX14577_CHARGER_TYPE_RESERVED: default: return 0; } } /* * Supported health statuses: * - POWER_SUPPLY_HEALTH_DEAD * - POWER_SUPPLY_HEALTH_OVERVOLTAGE * - POWER_SUPPLY_HEALTH_GOOD */ static int max14577_get_battery_health(struct max14577_charger *chg) { struct regmap *rmap = chg->max14577->regmap; int state = POWER_SUPPLY_HEALTH_GOOD; u8 reg_data; max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data); reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT); if (reg_data == MAX14577_CHARGER_TYPE_DEAD_BATTERY) { state = POWER_SUPPLY_HEALTH_DEAD; goto state_set; } max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); if (reg_data & STATUS3_OVP_MASK) { state = POWER_SUPPLY_HEALTH_OVERVOLTAGE; goto state_set; } state_set: chg->battery_state = state; return state; } /* * Always returns 1. * The max14577 chip doesn't report any status of battery presence. * Lets assume that it will always be used with some battery. */ static int max14577_get_present(struct max14577_charger *chg) { return 1; } /* * Sets charger registers to proper and safe default values. * Some of these values are equal to defaults in MAX14577E * data sheet but there are minor differences. */ static void max14577_charger_reg_init(struct max14577_charger *chg) { struct regmap *rmap = chg->max14577->regmap; u8 reg_data; /* * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0) * Charger-Detection Enable, default on (set CHGDETEN to 1) * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit */ reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT; max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1, CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK, reg_data); /* Battery Fast-Charge Timer, from SM-V700: 6hrs */ reg_data = 0x3 << CHGCTRL1_TCHW_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL1, reg_data); /* * Wall-Adapter Rapid Charge, default on * Battery-Charger, default on */ reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT; reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data); /* Battery-Charger Constant Voltage (CV) Mode, from SM-V700: 4.35V */ reg_data = 0xf << CHGCTRL3_MBCCVWRC_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL3, reg_data); /* * Fast Battery-Charge Current Low, default 200-950mA * Fast Battery-Charge Current High, from SM-V700: 450mA */ reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; reg_data |= 0x5 << CHGCTRL4_MBCICHWRCH_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL4, reg_data); /* End-of-Charge Current, from SM-V700: 50mA */ reg_data = 0x0 << CHGCTRL5_EOCS_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL5, reg_data); /* Auto Charging Stop, default off */ reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data); /* Overvoltage-Protection Threshold, from SM-V700: 6.5V */ reg_data = 0x2 << CHGCTRL7_OTPCGHCVS_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data); } /* Support property from charger */ static enum power_supply_property max14577_charger_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_CHARGE_TYPE, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER, }; static const char *model_name = "MAX14577"; static const char *manufacturer = "Maxim Integrated"; static int max14577_charger_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max14577_charger *chg = container_of(psy, struct max14577_charger, charger); int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_STATUS: val->intval = max14577_get_charger_state(chg); break; case POWER_SUPPLY_PROP_CHARGE_TYPE: val->intval = max14577_get_charge_type(chg); break; case POWER_SUPPLY_PROP_HEALTH: val->intval = max14577_get_battery_health(chg); break; case POWER_SUPPLY_PROP_PRESENT: val->intval = max14577_get_present(chg); break; case POWER_SUPPLY_PROP_ONLINE: val->intval = max14577_get_online(chg); break; case POWER_SUPPLY_PROP_MODEL_NAME: val->strval = model_name; break; case POWER_SUPPLY_PROP_MANUFACTURER: val->strval = manufacturer; break; default: return -EINVAL; } return ret; } static int max14577_charger_probe(struct platform_device *pdev) { struct max14577_charger *chg; struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); int ret; chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL); if (!chg) return -ENOMEM; platform_set_drvdata(pdev, chg); chg->dev = &pdev->dev; chg->max14577 = max14577; max14577_charger_reg_init(chg); chg->charger.name = "max14577-charger", chg->charger.type = POWER_SUPPLY_TYPE_BATTERY, chg->charger.properties = max14577_charger_props, chg->charger.num_properties = ARRAY_SIZE(max14577_charger_props), chg->charger.get_property = max14577_charger_get_property, ret = power_supply_register(&pdev->dev, &chg->charger); if (ret) { dev_err(&pdev->dev, "failed: power supply register\n"); return ret; } return 0; } static int max14577_charger_remove(struct platform_device *pdev) { struct max14577_charger *chg = platform_get_drvdata(pdev); power_supply_unregister(&chg->charger); return 0; } static struct platform_driver max14577_charger_driver = { .driver = { .owner = THIS_MODULE, .name = "max14577-charger", }, .probe = max14577_charger_probe, .remove = max14577_charger_remove, }; module_platform_driver(max14577_charger_driver); MODULE_AUTHOR("Krzysztof Kozlowski "); MODULE_DESCRIPTION("MAXIM 14577 charger driver"); MODULE_LICENSE("GPL");