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1// SPDX-License-Identifier: GPL-2.0+2//3// max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP39744//5// Copyright (C) 2009-2010 Samsung Electronics6// MyungJoo Ham <myungjoo.ham@samsung.com>7 8#include <linux/err.h>9#include <linux/module.h>10#include <linux/mod_devicetable.h>11#include <linux/slab.h>12#include <linux/platform_device.h>13#include <linux/power_supply.h>14#include <linux/mfd/max8998.h>15#include <linux/mfd/max8998-private.h>16 17struct max8998_battery_data {18 struct device *dev;19 struct max8998_dev *iodev;20 struct power_supply *battery;21};22 23static enum power_supply_property max8998_battery_props[] = {24 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */25 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */26 POWER_SUPPLY_PROP_STATUS, /* charger is charging/discharging/full */27};28 29/* Note that the charger control is done by a current regulator "CHARGER" */30static int max8998_battery_get_property(struct power_supply *psy,31 enum power_supply_property psp,32 union power_supply_propval *val)33{34 struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy);35 struct i2c_client *i2c = max8998->iodev->i2c;36 int ret;37 u8 reg;38 39 switch (psp) {40 case POWER_SUPPLY_PROP_PRESENT:41 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);42 if (ret)43 return ret;44 if (reg & (1 << 4))45 val->intval = 0;46 else47 val->intval = 1;48 break;49 case POWER_SUPPLY_PROP_ONLINE:50 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);51 if (ret)52 return ret;53 54 if (reg & (1 << 5))55 val->intval = 1;56 else57 val->intval = 0;58 59 break;60 case POWER_SUPPLY_PROP_STATUS:61 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);62 if (ret)63 return ret;64 65 if (!(reg & (1 << 5))) {66 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;67 } else {68 if (reg & (1 << 6))69 val->intval = POWER_SUPPLY_STATUS_FULL;70 else if (reg & (1 << 3))71 val->intval = POWER_SUPPLY_STATUS_CHARGING;72 else73 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;74 }75 break;76 default:77 return -EINVAL;78 }79 80 return 0;81}82 83static const struct power_supply_desc max8998_battery_desc = {84 .name = "max8998_pmic",85 .type = POWER_SUPPLY_TYPE_BATTERY,86 .get_property = max8998_battery_get_property,87 .properties = max8998_battery_props,88 .num_properties = ARRAY_SIZE(max8998_battery_props),89};90 91static int max8998_battery_probe(struct platform_device *pdev)92{93 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);94 struct max8998_platform_data *pdata = iodev->pdata;95 struct power_supply_config psy_cfg = {};96 struct max8998_battery_data *max8998;97 struct i2c_client *i2c;98 int ret = 0;99 100 if (!pdata) {101 dev_err(pdev->dev.parent, "No platform init data supplied\n");102 return -ENODEV;103 }104 105 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),106 GFP_KERNEL);107 if (!max8998)108 return -ENOMEM;109 110 max8998->dev = &pdev->dev;111 max8998->iodev = iodev;112 platform_set_drvdata(pdev, max8998);113 i2c = max8998->iodev->i2c;114 115 /* Setup "End of Charge" */116 /* If EOC value equals 0,117 * remain value set from bootloader or default value */118 if (pdata->eoc >= 10 && pdata->eoc <= 45) {119 max8998_update_reg(i2c, MAX8998_REG_CHGR1,120 (pdata->eoc / 5 - 2) << 5, 0x7 << 5);121 } else if (pdata->eoc == 0) {122 dev_dbg(max8998->dev,123 "EOC value not set: leave it unchanged.\n");124 } else {125 dev_err(max8998->dev, "Invalid EOC value\n");126 return -EINVAL;127 }128 129 /* Setup Charge Restart Level */130 switch (pdata->restart) {131 case 100:132 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);133 break;134 case 150:135 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);136 break;137 case 200:138 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);139 break;140 case -1:141 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);142 break;143 case 0:144 dev_dbg(max8998->dev,145 "Restart Level not set: leave it unchanged.\n");146 break;147 default:148 dev_err(max8998->dev, "Invalid Restart Level\n");149 return -EINVAL;150 }151 152 /* Setup Charge Full Timeout */153 switch (pdata->timeout) {154 case 5:155 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);156 break;157 case 6:158 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);159 break;160 case 7:161 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);162 break;163 case -1:164 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);165 break;166 case 0:167 dev_dbg(max8998->dev,168 "Full Timeout not set: leave it unchanged.\n");169 break;170 default:171 dev_err(max8998->dev, "Invalid Full Timeout value\n");172 return -EINVAL;173 }174 175 psy_cfg.drv_data = max8998;176 177 max8998->battery = devm_power_supply_register(max8998->dev,178 &max8998_battery_desc,179 &psy_cfg);180 if (IS_ERR(max8998->battery)) {181 ret = PTR_ERR(max8998->battery);182 dev_err(max8998->dev, "failed: power supply register: %d\n",183 ret);184 return ret;185 }186 187 return 0;188}189 190static const struct platform_device_id max8998_battery_id[] = {191 { "max8998-battery", TYPE_MAX8998 },192 { }193};194MODULE_DEVICE_TABLE(platform, max8998_battery_id);195 196static struct platform_driver max8998_battery_driver = {197 .driver = {198 .name = "max8998-battery",199 },200 .probe = max8998_battery_probe,201 .id_table = max8998_battery_id,202};203 204module_platform_driver(max8998_battery_driver);205 206MODULE_DESCRIPTION("MAXIM 8998 battery control driver");207MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");208MODULE_LICENSE("GPL");209MODULE_ALIAS("platform:max8998-battery");210