// SPDX-License-Identifier: GPL-2.0+ // // max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974 // // Copyright (C) 2009-2010 Samsung Electronics // MyungJoo Ham <myungjoo.ham@samsung.com> #include <linux/err.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/mfd/max8998.h> #include <linux/mfd/max8998-private.h> struct max8998_battery_data { struct device *dev; struct max8998_dev *iodev; struct power_supply *battery; }; static enum power_supply_property max8998_battery_props[] = { POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ POWER_SUPPLY_PROP_STATUS, /* charger is charging/discharging/full */ }; /* Note that the charger control is done by a current regulator "CHARGER" */ static int max8998_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy); struct i2c_client *i2c = max8998->iodev->i2c; int ret; u8 reg; switch (psp) { case POWER_SUPPLY_PROP_PRESENT: ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); if (ret) return ret; if (reg & (1 << 4)) val->intval = 0; else val->intval = 1; break; case POWER_SUPPLY_PROP_ONLINE: ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); if (ret) return ret; if (reg & (1 << 5)) val->intval = 1; else val->intval = 0; break; case POWER_SUPPLY_PROP_STATUS: ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); if (ret) return ret; if (!(reg & (1 << 5))) { val->intval = POWER_SUPPLY_STATUS_DISCHARGING; } else { if (reg & (1 << 6)) val->intval = POWER_SUPPLY_STATUS_FULL; else if (reg & (1 << 3)) val->intval = POWER_SUPPLY_STATUS_CHARGING; else val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; } break; default: return -EINVAL; } return 0; } static const struct power_supply_desc max8998_battery_desc = { .name = "max8998_pmic", .type = POWER_SUPPLY_TYPE_BATTERY, .get_property = max8998_battery_get_property, .properties = max8998_battery_props, .num_properties = ARRAY_SIZE(max8998_battery_props), }; static int max8998_battery_probe(struct platform_device *pdev) { struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct max8998_platform_data *pdata = iodev->pdata; struct power_supply_config psy_cfg = {}; struct max8998_battery_data *max8998; struct i2c_client *i2c; int ret = 0; if (!pdata) { dev_err(pdev->dev.parent, "No platform init data supplied\n"); return -ENODEV; } max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data), GFP_KERNEL); if (!max8998) return -ENOMEM; max8998->dev = &pdev->dev; max8998->iodev = iodev; platform_set_drvdata(pdev, max8998); i2c = max8998->iodev->i2c; /* Setup "End of Charge" */ /* If EOC value equals 0, * remain value set from bootloader or default value */ if (pdata->eoc >= 10 && pdata->eoc <= 45) { max8998_update_reg(i2c, MAX8998_REG_CHGR1, (pdata->eoc / 5 - 2) << 5, 0x7 << 5); } else if (pdata->eoc == 0) { dev_dbg(max8998->dev, "EOC value not set: leave it unchanged.\n"); } else { dev_err(max8998->dev, "Invalid EOC value\n"); return -EINVAL; } /* Setup Charge Restart Level */ switch (pdata->restart) { case 100: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3); break; case 150: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3); break; case 200: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3); break; case -1: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3); break; case 0: dev_dbg(max8998->dev, "Restart Level not set: leave it unchanged.\n"); break; default: dev_err(max8998->dev, "Invalid Restart Level\n"); return -EINVAL; } /* Setup Charge Full Timeout */ switch (pdata->timeout) { case 5: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4); break; case 6: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4); break; case 7: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4); break; case -1: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4); break; case 0: dev_dbg(max8998->dev, "Full Timeout not set: leave it unchanged.\n"); break; default: dev_err(max8998->dev, "Invalid Full Timeout value\n"); return -EINVAL; } psy_cfg.drv_data = max8998; max8998->battery = devm_power_supply_register(max8998->dev, &max8998_battery_desc, &psy_cfg); if (IS_ERR(max8998->battery)) { ret = PTR_ERR(max8998->battery); dev_err(max8998->dev, "failed: power supply register: %d\n", ret); return ret; } return 0; } static const struct platform_device_id max8998_battery_id[] = { { "max8998-battery", TYPE_MAX8998 }, { } }; static struct platform_driver max8998_battery_driver = { .driver = { .name = "max8998-battery", }, .probe = max8998_battery_probe, .id_table = max8998_battery_id, }; module_platform_driver(max8998_battery_driver); MODULE_DESCRIPTION("MAXIM 8998 battery control driver"); MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:max8998-battery");