// 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 <[email protected]>
#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 },
{ }
};
MODULE_DEVICE_TABLE(platform, max8998_battery_id);
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 <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max8998-battery");
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