// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Spreadtrum Communications Inc.
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/usb/phy.h>
#include <linux/regmap.h>
#include <linux/notifier.h>
#include <linux/of.h>
/* PMIC global registers definition */
#define SC2731_CHARGE_STATUS 0xedc
#define SC2731_CHARGE_FULL BIT(4)
#define SC2731_MODULE_EN1 0xc0c
#define SC2731_CHARGE_EN BIT(5)
/* SC2731 switch charger registers definition */
#define SC2731_CHG_CFG0 0x0
#define SC2731_CHG_CFG1 0x4
#define SC2731_CHG_CFG2 0x8
#define SC2731_CHG_CFG3 0xc
#define SC2731_CHG_CFG4 0x10
#define SC2731_CHG_CFG5 0x28
/* SC2731_CHG_CFG0 register definition */
#define SC2731_PRECHG_RNG_SHIFT 11
#define SC2731_PRECHG_RNG_MASK GENMASK(12, 11)
#define SC2731_TERMINATION_VOL_MASK GENMASK(2, 1)
#define SC2731_TERMINATION_VOL_SHIFT 1
#define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3)
#define SC2731_TERMINATION_VOL_CAL_SHIFT 3
#define SC2731_TERMINATION_CUR_MASK GENMASK(2, 0)
#define SC2731_CC_EN BIT(13)
#define SC2731_CHARGER_PD BIT(0)
/* SC2731_CHG_CFG1 register definition */
#define SC2731_CUR_MASK GENMASK(5, 0)
/* SC2731_CHG_CFG5 register definition */
#define SC2731_CUR_LIMIT_SHIFT 8
#define SC2731_CUR_LIMIT_MASK GENMASK(9, 8)
/* Default current definition (unit is mA) */
#define SC2731_CURRENT_LIMIT_100 100
#define SC2731_CURRENT_LIMIT_500 500
#define SC2731_CURRENT_LIMIT_900 900
#define SC2731_CURRENT_LIMIT_2000 2000
#define SC2731_CURRENT_PRECHG 450
#define SC2731_CURRENT_STEP 50
struct sc2731_charger_info {
struct device *dev;
struct regmap *regmap;
struct usb_phy *usb_phy;
struct notifier_block usb_notify;
struct power_supply *psy_usb;
struct work_struct work;
struct mutex lock;
bool charging;
u32 base;
u32 limit;
};
static void sc2731_charger_stop_charge(struct sc2731_charger_info *info)
{
regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
SC2731_CC_EN, 0);
regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
SC2731_CHARGER_PD, SC2731_CHARGER_PD);
}
static int sc2731_charger_start_charge(struct sc2731_charger_info *info)
{
int ret;
/* Enable charger constant current mode */
ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
SC2731_CC_EN, SC2731_CC_EN);
if (ret)
return ret;
/* Start charging */
return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
SC2731_CHARGER_PD, 0);
}
static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info,
u32 limit)
{
u32 val;
if (limit <= SC2731_CURRENT_LIMIT_100)
val = 0;
else if (limit <= SC2731_CURRENT_LIMIT_500)
val = 3;
else if (limit <= SC2731_CURRENT_LIMIT_900)
val = 2;
else
val = 1;
return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5,
SC2731_CUR_LIMIT_MASK,
val << SC2731_CUR_LIMIT_SHIFT);
}
static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur)
{
u32 val;
int ret;
if (cur > SC2731_CURRENT_LIMIT_2000)
cur = SC2731_CURRENT_LIMIT_2000;
else if (cur < SC2731_CURRENT_PRECHG)
cur = SC2731_CURRENT_PRECHG;
/* Calculate the step value, each step is 50 mA */
val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP;
/* Set pre-charge current as 450 mA */
ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
SC2731_PRECHG_RNG_MASK,
0x3 << SC2731_PRECHG_RNG_SHIFT);
if (ret)
return ret;
return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1,
SC2731_CUR_MASK, val);
}
static int sc2731_charger_get_status(struct sc2731_charger_info *info)
{
u32 val;
int ret;
ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val);
if (ret)
return ret;
if (val & SC2731_CHARGE_FULL)
return POWER_SUPPLY_STATUS_FULL;
return POWER_SUPPLY_STATUS_CHARGING;
}
static int sc2731_charger_get_current(struct sc2731_charger_info *info,
u32 *cur)
{
int ret;
u32 val;
ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val);
if (ret)
return ret;
val &= SC2731_CUR_MASK;
*cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG;
return 0;
}
static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info,
u32 *cur)
{
int ret;
u32 val;
ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val);
if (ret)
return ret;
val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT;
switch (val) {
case 0:
*cur = SC2731_CURRENT_LIMIT_100;
break;
case 1:
*cur = SC2731_CURRENT_LIMIT_2000;
break;
case 2:
*cur = SC2731_CURRENT_LIMIT_900;
break;
case 3:
*cur = SC2731_CURRENT_LIMIT_500;
break;
default:
return -EINVAL;
}
return 0;
}
static int
sc2731_charger_usb_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
int ret;
mutex_lock(&info->lock);
if (!info->charging) {
mutex_unlock(&info->lock);
return -ENODEV;
}
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
ret = sc2731_charger_set_current(info, val->intval / 1000);
if (ret < 0)
dev_err(info->dev, "set charge current failed\n");
break;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
ret = sc2731_charger_set_current_limit(info,
val->intval / 1000);
if (ret < 0)
dev_err(info->dev, "set input current limit failed\n");
break;
default:
ret = -EINVAL;
}
mutex_unlock(&info->lock);
return ret;
}
static int sc2731_charger_usb_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
int ret = 0;
u32 cur;
mutex_lock(&info->lock);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (info->charging)
val->intval = sc2731_charger_get_status(info);
else
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
if (!info->charging) {
val->intval = 0;
} else {
ret = sc2731_charger_get_current(info, &cur);
if (ret)
goto out;
val->intval = cur * 1000;
}
break;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
if (!info->charging) {
val->intval = 0;
} else {
ret = sc2731_charger_get_current_limit(info, &cur);
if (ret)
goto out;
val->intval = cur * 1000;
}
break;
default:
ret = -EINVAL;
}
out:
mutex_unlock(&info->lock);
return ret;
}
static int sc2731_charger_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
ret = 1;
break;
default:
ret = 0;
}
return ret;
}
static enum power_supply_property sc2731_usb_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
};
static const struct power_supply_desc sc2731_charger_desc = {
.name = "sc2731_charger",
.type = POWER_SUPPLY_TYPE_USB,
.properties = sc2731_usb_props,
.num_properties = ARRAY_SIZE(sc2731_usb_props),
.get_property = sc2731_charger_usb_get_property,
.set_property = sc2731_charger_usb_set_property,
.property_is_writeable = sc2731_charger_property_is_writeable,
};
static void sc2731_charger_work(struct work_struct *data)
{
struct sc2731_charger_info *info =
container_of(data, struct sc2731_charger_info, work);
int ret;
mutex_lock(&info->lock);
if (info->limit > 0 && !info->charging) {
/* set current limitation and start to charge */
ret = sc2731_charger_set_current_limit(info, info->limit);
if (ret)
goto out;
ret = sc2731_charger_set_current(info, info->limit);
if (ret)
goto out;
ret = sc2731_charger_start_charge(info);
if (ret)
goto out;
info->charging = true;
} else if (!info->limit && info->charging) {
/* Stop charging */
info->charging = false;
sc2731_charger_stop_charge(info);
}
out:
mutex_unlock(&info->lock);
}
static int sc2731_charger_usb_change(struct notifier_block *nb,
unsigned long limit, void *data)
{
struct sc2731_charger_info *info =
container_of(nb, struct sc2731_charger_info, usb_notify);
info->limit = limit;
schedule_work(&info->work);
return NOTIFY_OK;
}
static int sc2731_charger_hw_init(struct sc2731_charger_info *info)
{
struct power_supply_battery_info bat_info = { };
u32 term_currrent, term_voltage, cur_val, vol_val;
int ret;
/* Enable charger module */
ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1,
SC2731_CHARGE_EN, SC2731_CHARGE_EN);
if (ret)
return ret;
ret = power_supply_get_battery_info(info->psy_usb, &bat_info);
if (ret) {
dev_warn(info->dev, "no battery information is supplied\n");
/*
* If no battery information is supplied, we should set
* default charge termination current to 120 mA, and default
* charge termination voltage to 4.35V.
*/
cur_val = 0x2;
vol_val = 0x1;
} else {
term_currrent = bat_info.charge_term_current_ua / 1000;
if (term_currrent <= 90)
cur_val = 0;
else if (term_currrent >= 265)
cur_val = 0x7;
else
cur_val = ((term_currrent - 90) / 25) + 1;
term_voltage = bat_info.constant_charge_voltage_max_uv / 1000;
if (term_voltage > 4500)
term_voltage = 4500;
if (term_voltage > 4200)
vol_val = (term_voltage - 4200) / 100;
else
vol_val = 0;
power_supply_put_battery_info(info->psy_usb, &bat_info);
}
/* Set charge termination current */
ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2,
SC2731_TERMINATION_CUR_MASK, cur_val);
if (ret)
goto error;
/* Set charge termination voltage */
ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
SC2731_TERMINATION_VOL_MASK |
SC2731_TERMINATION_VOL_CAL_MASK,
(vol_val << SC2731_TERMINATION_VOL_SHIFT) |
(0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT));
if (ret)
goto error;
return 0;
error:
regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0);
return ret;
}
static void sc2731_charger_detect_status(struct sc2731_charger_info *info)
{
unsigned int min, max;
/*
* If the USB charger status has been USB_CHARGER_PRESENT before
* registering the notifier, we should start to charge with getting
* the charge current.
*/
if (info->usb_phy->chg_state != USB_CHARGER_PRESENT)
return;
usb_phy_get_charger_current(info->usb_phy, &min, &max);
info->limit = min;
schedule_work(&info->work);
}
static int sc2731_charger_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct sc2731_charger_info *info;
struct power_supply_config charger_cfg = { };
int ret;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
mutex_init(&info->lock);
info->dev = &pdev->dev;
INIT_WORK(&info->work, sc2731_charger_work);
info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!info->regmap) {
dev_err(&pdev->dev, "failed to get charger regmap\n");
return -ENODEV;
}
ret = of_property_read_u32(np, "reg", &info->base);
if (ret) {
dev_err(&pdev->dev, "failed to get register address\n");
return -ENODEV;
}
charger_cfg.drv_data = info;
charger_cfg.of_node = np;
info->psy_usb = devm_power_supply_register(&pdev->dev,
&sc2731_charger_desc,
&charger_cfg);
if (IS_ERR(info->psy_usb)) {
dev_err(&pdev->dev, "failed to register power supply\n");
return PTR_ERR(info->psy_usb);
}
ret = sc2731_charger_hw_init(info);
if (ret)
return ret;
info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
if (IS_ERR(info->usb_phy)) {
dev_err(&pdev->dev, "failed to find USB phy\n");
return PTR_ERR(info->usb_phy);
}
info->usb_notify.notifier_call = sc2731_charger_usb_change;
ret = usb_register_notifier(info->usb_phy, &info->usb_notify);
if (ret) {
dev_err(&pdev->dev, "failed to register notifier: %d\n", ret);
return ret;
}
sc2731_charger_detect_status(info);
return 0;
}
static int sc2731_charger_remove(struct platform_device *pdev)
{
struct sc2731_charger_info *info = platform_get_drvdata(pdev);
usb_unregister_notifier(info->usb_phy, &info->usb_notify);
return 0;
}
static const struct of_device_id sc2731_charger_of_match[] = {
{ .compatible = "sprd,sc2731-charger", },
{ }
};
static struct platform_driver sc2731_charger_driver = {
.driver = {
.name = "sc2731-charger",
.of_match_table = sc2731_charger_of_match,
},
.probe = sc2731_charger_probe,
.remove = sc2731_charger_remove,
};
module_platform_driver(sc2731_charger_driver);
MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver");
MODULE_LICENSE("GPL v2");