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// SPDX-License-Identifier: GPL-2.0+
//
// max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
//
// Copyright (C) 2011 Samsung Electronics
// MyungJoo Ham <myungjoo.ham@samsung.com>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
#include <linux/regulator/consumer.h>
#include <linux/devm-helpers.h>
/* MAX8997_REG_STATUS4 */
#define DCINOK_SHIFT 1
#define DCINOK_MASK (1 << DCINOK_SHIFT)
#define DETBAT_SHIFT 2
#define DETBAT_MASK (1 << DETBAT_SHIFT)
/* MAX8997_REG_MBCCTRL1 */
#define TFCH_SHIFT 4
#define TFCH_MASK (7 << TFCH_SHIFT)
/* MAX8997_REG_MBCCTRL5 */
#define ITOPOFF_SHIFT 0
#define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)
struct charger_data {
struct device *dev;
struct max8997_dev *iodev;
struct power_supply *battery;
struct regulator *reg;
struct extcon_dev *edev;
struct notifier_block extcon_nb;
struct work_struct extcon_work;
};
static enum power_supply_property max8997_battery_props[] = {
POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */
POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
};
/* Note that the charger control is done by a current regulator "CHARGER" */
static int max8997_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct charger_data *charger = power_supply_get_drvdata(psy);
struct i2c_client *i2c = charger->iodev->i2c;
int ret;
u8 reg;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = 0;
ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
if (ret)
return ret;
if ((reg & (1 << 0)) == 0x1)
val->intval = POWER_SUPPLY_STATUS_FULL;
else if ((reg & DCINOK_MASK))
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 0;
ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
if (ret)
return ret;
if ((reg & DETBAT_MASK) == 0x0)
val->intval = 1;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = 0;
ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
if (ret)
return ret;
if (reg & DCINOK_MASK)
val->intval = 1;
break;
default:
return -EINVAL;
}
return 0;
}
static void max8997_battery_extcon_evt_worker(struct work_struct *work)
{
struct charger_data *charger =
container_of(work, struct charger_data, extcon_work);
struct extcon_dev *edev = charger->edev;
int current_limit;
if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
dev_dbg(charger->dev, "USB SDP charger is connected\n");
current_limit = 450000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
dev_dbg(charger->dev, "USB DCP charger is connected\n");
current_limit = 650000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
dev_dbg(charger->dev, "USB FAST charger is connected\n");
current_limit = 650000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
dev_dbg(charger->dev, "USB SLOW charger is connected\n");
current_limit = 650000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
dev_dbg(charger->dev, "USB CDP charger is connected\n");
current_limit = 650000;
} else {
dev_dbg(charger->dev, "USB charger is disconnected\n");
current_limit = -1;
}
if (current_limit > 0) {
int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);
if (ret) {
dev_err(charger->dev, "failed to set current limit: %d\n", ret);
return;
}
ret = regulator_enable(charger->reg);
if (ret)
dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
} else {
int ret = regulator_disable(charger->reg);
if (ret)
dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
}
}
static int max8997_battery_extcon_evt(struct notifier_block *nb,
unsigned long event, void *param)
{
struct charger_data *charger =
container_of(nb, struct charger_data, extcon_nb);
schedule_work(&charger->extcon_work);
return NOTIFY_OK;
}
static const struct power_supply_desc max8997_battery_desc = {
.name = "max8997_pmic",
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = max8997_battery_get_property,
.properties = max8997_battery_props,
.num_properties = ARRAY_SIZE(max8997_battery_props),
};
static int max8997_battery_probe(struct platform_device *pdev)
{
int ret = 0;
struct charger_data *charger;
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct device_node *np = pdev->dev.of_node;
struct i2c_client *i2c = iodev->i2c;
struct max8997_platform_data *pdata = iodev->pdata;
struct power_supply_config psy_cfg = {};
if (!pdata) {
dev_err(&pdev->dev, "No platform data supplied.\n");
return -EINVAL;
}
if (pdata->eoc_mA) {
int val = (pdata->eoc_mA - 50) / 10;
if (val < 0)
val = 0;
if (val > 0xf)
val = 0xf;
ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
val << ITOPOFF_SHIFT, ITOPOFF_MASK);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot use i2c bus.\n");
return ret;
}
}
switch (pdata->timeout) {
case 5:
ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
0x2 << TFCH_SHIFT, TFCH_MASK);
break;
case 6:
ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
0x3 << TFCH_SHIFT, TFCH_MASK);
break;
case 7:
ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
0x4 << TFCH_SHIFT, TFCH_MASK);
break;
case 0:
ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
0x7 << TFCH_SHIFT, TFCH_MASK);
break;
default:
dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
pdata->timeout);
return -EINVAL;
}
if (ret < 0) {
dev_err(&pdev->dev, "Cannot use i2c bus.\n");
return ret;
}
charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
if (!charger)
return -ENOMEM;
platform_set_drvdata(pdev, charger);
charger->dev = &pdev->dev;
charger->iodev = iodev;
psy_cfg.drv_data = charger;
charger->battery = devm_power_supply_register(&pdev->dev,
&max8997_battery_desc,
&psy_cfg);
if (IS_ERR(charger->battery)) {
dev_err(&pdev->dev, "failed: power supply register\n");
return PTR_ERR(charger->battery);
}
// grab regulator from parent device's node
pdev->dev.of_node = iodev->dev->of_node;
charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
pdev->dev.of_node = np;
if (IS_ERR(charger->reg)) {
if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_info(&pdev->dev, "couldn't get charger regulator\n");
}
charger->edev = extcon_get_extcon_dev("max8997-muic");
if (IS_ERR(charger->edev)) {
dev_err_probe(charger->dev, PTR_ERR(charger->edev),
"couldn't get extcon device: max8997-muic\n");
return PTR_ERR(charger->edev);
}
if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
ret = devm_work_autocancel(&pdev->dev, &charger->extcon_work,
max8997_battery_extcon_evt_worker);
if (ret) {
dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
return ret;
}
charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
&charger->extcon_nb);
if (ret) {
dev_err(&pdev->dev, "failed to register extcon notifier\n");
return ret;
}
}
return 0;
}
static const struct platform_device_id max8997_battery_id[] = {
{ "max8997-battery", 0 },
{ }
};
MODULE_DEVICE_TABLE(platform, max8997_battery_id);
static struct platform_driver max8997_battery_driver = {
.driver = {
.name = "max8997-battery",
},
.probe = max8997_battery_probe,
.id_table = max8997_battery_id,
};
module_platform_driver(max8997_battery_driver);
MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");
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