linux/drivers/power/supply/max8998_charger.c
Jonathan Bakker 5d809cb280 power: supply: max8998_charger: Correct ONLINE and add STATUS props
The ONLINE prop should be when the charger is present (ie able to
charge), however, it was for when it was actually charging or not.
Instead, add the STATUS prop to show whether charging is actually
going on or not.

The magic numbers have been ported from a downstream kernel for the
SGH-T959V.

Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2020-06-19 19:58:23 +02:00

209 lines
5.3 KiB
C

// 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, &reg);
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, &reg);
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, &reg);
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");