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