// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2023, Nikita Travkin <[email protected]>
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/extcon-provider.h>
#include <linux/mod_devicetable.h>
/* Two bytes: type + subtype */
#define PM8916_PERPH_TYPE 0x04
#define PM8916_LBC_CHGR_TYPE 0x1502
#define PM8916_LBC_BAT_IF_TYPE 0x1602
#define PM8916_LBC_USB_TYPE 0x1702
#define PM8916_LBC_MISC_TYPE 0x1802
#define PM8916_LBC_CHGR_CHG_OPTION 0x08
#define PM8916_LBC_CHGR_PMIC_CHARGER BIT(7)
#define PM8916_LBC_CHGR_CHG_STATUS 0x09
#define PM8916_INT_RT_STS 0x10
#define PM8916_LBC_USB_USBIN_VALID BIT(1)
#define PM8916_LBC_CHGR_VDD_MAX 0x40
#define PM8916_LBC_CHGR_VDD_SAFE 0x41
#define PM8916_LBC_CHGR_IBAT_MAX 0x44
#define PM8916_LBC_CHGR_IBAT_SAFE 0x45
#define PM8916_LBC_CHGR_TCHG_MAX_EN 0x60
#define PM8916_LBC_CHGR_TCHG_MAX_ENABLED BIT(7)
#define PM8916_LBC_CHGR_TCHG_MAX 0x61
#define PM8916_LBC_CHGR_CHG_CTRL 0x49
#define PM8916_LBC_CHGR_CHG_EN BIT(7)
#define PM8916_LBC_CHGR_PSTG_EN BIT(5)
#define PM8916_LBC_CHGR_MIN_CURRENT 90000
#define PM8916_LBC_CHGR_MAX_CURRENT 1440000
#define PM8916_LBC_CHGR_MIN_VOLTAGE 4000000
#define PM8916_LBC_CHGR_MAX_VOLTAGE 4775000
#define PM8916_LBC_CHGR_VOLTAGE_STEP 25000
#define PM8916_LBC_CHGR_MIN_TIME 4
#define PM8916_LBC_CHGR_MAX_TIME 256
struct pm8916_lbc_charger {
struct device *dev;
struct extcon_dev *edev;
struct power_supply *charger;
struct power_supply_battery_info *info;
struct regmap *regmap;
unsigned int reg[4];
bool online;
unsigned int charge_voltage_max;
unsigned int charge_voltage_safe;
unsigned int charge_current_max;
unsigned int charge_current_safe;
};
static const unsigned int pm8916_lbc_charger_cable[] = {
EXTCON_USB,
EXTCON_NONE,
};
enum {
LBC_CHGR = 0,
LBC_BAT_IF,
LBC_USB,
LBC_MISC,
};
static int pm8916_lbc_charger_configure(struct pm8916_lbc_charger *chg)
{
int ret = 0;
unsigned int tmp;
chg->charge_voltage_max = clamp_t(u32, chg->charge_voltage_max,
PM8916_LBC_CHGR_MIN_VOLTAGE, chg->charge_voltage_safe);
tmp = chg->charge_voltage_max - PM8916_LBC_CHGR_MIN_VOLTAGE;
tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP;
chg->charge_voltage_max = PM8916_LBC_CHGR_MIN_VOLTAGE + tmp * PM8916_LBC_CHGR_VOLTAGE_STEP;
ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_MAX, tmp);
if (ret)
goto error;
chg->charge_current_max = min(chg->charge_current_max, chg->charge_current_safe);
tmp = clamp_t(u32, chg->charge_current_max,
PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT);
tmp = chg->charge_current_max / PM8916_LBC_CHGR_MIN_CURRENT - 1;
chg->charge_current_max = (tmp + 1) * PM8916_LBC_CHGR_MIN_CURRENT;
ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_MAX, tmp);
if (ret)
goto error;
ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_CTRL,
PM8916_LBC_CHGR_CHG_EN | PM8916_LBC_CHGR_PSTG_EN);
if (ret)
goto error;
return ret;
error:
dev_err(chg->dev, "Failed to configure charging: %pe\n", ERR_PTR(ret));
return ret;
}
static int pm8916_lbc_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = chg->online;
return 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
val->intval = chg->charge_voltage_max;
return 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
val->intval = chg->charge_current_max;
return 0;
default:
return -EINVAL;
};
}
static int pm8916_lbc_charger_set_property(struct power_supply *psy,
enum power_supply_property prop,
const union power_supply_propval *val)
{
struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy);
switch (prop) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
chg->charge_current_max = val->intval;
return pm8916_lbc_charger_configure(chg);
default:
return -EINVAL;
}
}
static int pm8916_lbc_charger_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return true;
default:
return false;
}
}
static enum power_supply_property pm8916_lbc_charger_properties[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
};
static irqreturn_t pm8916_lbc_charger_state_changed_irq(int irq, void *data)
{
struct pm8916_lbc_charger *chg = data;
unsigned int tmp;
int ret;
ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp);
if (ret)
return IRQ_HANDLED;
chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID);
extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online);
power_supply_changed(chg->charger);
return IRQ_HANDLED;
}
static int pm8916_lbc_charger_probe_dt(struct pm8916_lbc_charger *chg)
{
struct device *dev = chg->dev;
int ret = 0;
unsigned int tmp;
ret = device_property_read_u32(dev, "qcom,fast-charge-safe-voltage", &chg->charge_voltage_safe);
if (ret)
return ret;
if (chg->charge_voltage_safe < PM8916_LBC_CHGR_MIN_VOLTAGE)
return -EINVAL;
chg->charge_voltage_safe = clamp_t(u32, chg->charge_voltage_safe,
PM8916_LBC_CHGR_MIN_VOLTAGE, PM8916_LBC_CHGR_MAX_VOLTAGE);
tmp = chg->charge_voltage_safe - PM8916_LBC_CHGR_MIN_VOLTAGE;
tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP;
ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_SAFE, tmp);
if (ret)
return ret;
ret = device_property_read_u32(dev, "qcom,fast-charge-safe-current", &chg->charge_current_safe);
if (ret)
return ret;
if (chg->charge_current_safe < PM8916_LBC_CHGR_MIN_CURRENT)
return -EINVAL;
chg->charge_current_safe = clamp_t(u32, chg->charge_current_safe,
PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT);
chg->charge_current_max = chg->charge_current_safe;
tmp = chg->charge_current_safe / PM8916_LBC_CHGR_MIN_CURRENT - 1;
ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_SAFE, tmp);
if (ret)
return ret;
/* Disable charger timeout. */
ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_TCHG_MAX_EN, 0x00);
if (ret)
return ret;
return ret;
}
static const struct power_supply_desc pm8916_lbc_charger_psy_desc = {
.name = "pm8916-lbc-chgr",
.type = POWER_SUPPLY_TYPE_USB,
.properties = pm8916_lbc_charger_properties,
.num_properties = ARRAY_SIZE(pm8916_lbc_charger_properties),
.get_property = pm8916_lbc_charger_get_property,
.set_property = pm8916_lbc_charger_set_property,
.property_is_writeable = pm8916_lbc_charger_property_is_writeable,
};
static int pm8916_lbc_charger_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pm8916_lbc_charger *chg;
struct power_supply_config psy_cfg = {};
int ret, len, irq;
unsigned int tmp;
chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
if (!chg)
return -ENOMEM;
chg->dev = dev;
chg->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!chg->regmap)
return -ENODEV;
len = device_property_count_u32(dev, "reg");
if (len < 0)
return len;
if (len != 4)
return dev_err_probe(dev, -EINVAL,
"Wrong amount of reg values: %d (4 expected)\n", len);
irq = platform_get_irq_byname(pdev, "usb_vbus");
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL, pm8916_lbc_charger_state_changed_irq,
IRQF_ONESHOT, "pm8916_lbc", chg);
if (ret)
return ret;
ret = device_property_read_u32_array(dev, "reg", chg->reg, len);
if (ret)
return ret;
ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_PERPH_TYPE, &tmp, 2);
if (ret)
goto comm_error;
if (tmp != PM8916_LBC_CHGR_TYPE)
goto type_error;
ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_BAT_IF] + PM8916_PERPH_TYPE, &tmp, 2);
if (ret)
goto comm_error;
if (tmp != PM8916_LBC_BAT_IF_TYPE)
goto type_error;
ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_USB] + PM8916_PERPH_TYPE, &tmp, 2);
if (ret)
goto comm_error;
if (tmp != PM8916_LBC_USB_TYPE)
goto type_error;
ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_MISC] + PM8916_PERPH_TYPE, &tmp, 2);
if (ret)
goto comm_error;
if (tmp != PM8916_LBC_MISC_TYPE)
goto type_error;
ret = regmap_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_OPTION, &tmp);
if (ret)
goto comm_error;
if (tmp != PM8916_LBC_CHGR_PMIC_CHARGER)
dev_err_probe(dev, -ENODEV, "The system is using an external charger\n");
ret = pm8916_lbc_charger_probe_dt(chg);
if (ret)
dev_err_probe(dev, ret, "Error while parsing device tree\n");
psy_cfg.drv_data = chg;
psy_cfg.of_node = dev->of_node;
chg->charger = devm_power_supply_register(dev, &pm8916_lbc_charger_psy_desc, &psy_cfg);
if (IS_ERR(chg->charger))
return dev_err_probe(dev, PTR_ERR(chg->charger), "Unable to register charger\n");
ret = power_supply_get_battery_info(chg->charger, &chg->info);
if (ret)
return dev_err_probe(dev, ret, "Unable to get battery info\n");
chg->edev = devm_extcon_dev_allocate(dev, pm8916_lbc_charger_cable);
if (IS_ERR(chg->edev))
return PTR_ERR(chg->edev);
ret = devm_extcon_dev_register(dev, chg->edev);
if (ret < 0)
return dev_err_probe(dev, ret, "failed to register extcon device\n");
ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp);
if (ret)
goto comm_error;
chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID);
extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online);
chg->charge_voltage_max = chg->info->voltage_max_design_uv;
ret = pm8916_lbc_charger_configure(chg);
if (ret)
return ret;
return 0;
comm_error:
return dev_err_probe(dev, ret, "Unable to communicate with device\n");
type_error:
return dev_err_probe(dev, -ENODEV, "Device reported wrong type: 0x%X\n", tmp);
}
static const struct of_device_id pm8916_lbc_charger_of_match[] = {
{ .compatible = "qcom,pm8916-lbc", },
{}
};
MODULE_DEVICE_TABLE(of, pm8916_lbc_charger_of_match);
static struct platform_driver pm8916_lbc_charger_driver = {
.driver = {
.name = "pm8916-lbc",
.of_match_table = pm8916_lbc_charger_of_match,
},
.probe = pm8916_lbc_charger_probe,
};
module_platform_driver(pm8916_lbc_charger_driver);
MODULE_DESCRIPTION("pm8916 LBC driver");
MODULE_AUTHOR("Nikita Travkin <[email protected]>");
MODULE_LICENSE("GPL");
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