#include <linux/devm-helpers.h>
#include <linux/extcon.h>
#include <linux/mfd/samsung/core.h>
#include <linux/mfd/samsung/s2mu005.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
struct s2m_chgr {
struct device *dev;
struct regmap *regmap;
struct power_supply *psy;
struct extcon_dev *extcon;
struct work_struct extcon_work;
struct notifier_block extcon_nb;
};
static int s2mu005_chgr_get_online(struct s2m_chgr *priv, int *value)
{
u32 val;
int ret;
ret = regmap_read(priv->regmap, S2MU005_REG_CHGR_STATUS0, &val);
if (ret) {
dev_err(priv->dev, "failed to read register (%d)\n", ret);
return ret;
}
*value = !!(val & S2MU005_CHGR_CHG);
return 0;
}
static void s2mu005_chgr_get_usb_type(struct s2m_chgr *priv, int *value)
{
if (extcon_get_state(priv->extcon, EXTCON_CHG_USB_CDP) > 0)
*value = POWER_SUPPLY_USB_TYPE_CDP;
else if (extcon_get_state(priv->extcon, EXTCON_CHG_USB_SDP) > 0)
*value = POWER_SUPPLY_USB_TYPE_SDP;
else if (extcon_get_state(priv->extcon, EXTCON_CHG_USB_DCP) > 0)
*value = POWER_SUPPLY_USB_TYPE_DCP;
else
*value = POWER_SUPPLY_USB_TYPE_UNKNOWN;
}
static int s2mu005_chgr_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct s2m_chgr *priv = power_supply_get_drvdata(psy);
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
ret = s2mu005_chgr_get_online(priv, &val->intval);
if (ret)
return ret;
break;
case POWER_SUPPLY_PROP_USB_TYPE:
s2mu005_chgr_get_usb_type(priv, &val->intval);
break;
default:
return -EINVAL;
}
return 0;
}
static int s2mu005_chgr_mode_set_host(struct s2m_chgr *priv)
{
int ret;
ret = regmap_update_bits(priv->regmap, S2MU005_REG_CHGR_CTRL0,
S2MU005_CHGR_OP_MODE,
FIELD_PREP(S2MU005_CHGR_OP_MODE,
S2MU005_CHGR_OP_MODE_OTG));
if (ret) {
dev_err(priv->dev, "failed to set OTG mode (%d)\n", ret);
return ret;
}
ret = regmap_update_bits(priv->regmap, S2MU005_REG_CHGR_CTRL11,
S2MU005_CHGR_OSC_BOOST,
FIELD_PREP(S2MU005_CHGR_OSC_BOOST,
S2MU005_CHGR_OSC_BOOST_2MHZ));
if (ret) {
dev_err(priv->dev, "failed to set boost frequency (%d)\n", ret);
return ret;
}
ret = regmap_update_bits(priv->regmap, S2MU005_REG_CHGR_CTRL4,
S2MU005_CHGR_OTG_OCP,
FIELD_PREP(S2MU005_CHGR_OTG_OCP,
S2MU005_CHGR_OTG_OCP_1P5A));
if (ret) {
dev_err(priv->dev, "failed to set OTG current limit (%d)\n", ret);
return ret;
}
ret = regmap_set_bits(priv->regmap, S2MU005_REG_CHGR_CTRL4,
S2MU005_CHGR_OTG_OCP_OFF);
if (ret) {
dev_err(priv->dev, "failed to set OTG OCP switch (%d)\n", ret);
return ret;
}
ret = regmap_update_bits(priv->regmap, S2MU005_REG_CHGR_CTRL5,
S2MU005_CHGR_VMID_BOOST,
FIELD_PREP(S2MU005_CHGR_VMID_BOOST,
S2MU005_CHGR_VMID_BOOST_5P1V));
if (ret) {
dev_err(priv->dev, "failed to set OTG voltage (%d)\n", ret);
return ret;
}
ret = regmap_update_bits(priv->regmap, S2MU005_REG_CHGR_CTRL15,
S2MU005_CHGR_OTG_EN,
FIELD_PREP(S2MU005_CHGR_OTG_EN,
S2MU005_CHGR_OTG_EN_ON));
if (ret) {
dev_err(priv->dev, "failed to turn on OTG (%d)\n", ret);
return ret;
}
return 0;
}
static int s2mu005_chgr_mode_set_charger(struct s2m_chgr *priv)
{
int ret;
ret = regmap_clear_bits(priv->regmap, S2MU005_REG_CHGR_CTRL0,
S2MU005_CHGR_OP_MODE);
if (ret) {
dev_err(priv->dev, "failed to reset opmode (%d)\n", ret);
return ret;
}
msleep(50);
ret = regmap_update_bits(priv->regmap, S2MU005_REG_CHGR_CTRL0,
S2MU005_CHGR_OP_MODE,
FIELD_PREP(S2MU005_CHGR_OP_MODE,
S2MU005_CHGR_OP_MODE_CHG));
if (ret) {
dev_err(priv->dev, "failed to set opmode to charging (%d)\n", ret);
return ret;
}
return 0;
}
static int s2mu005_chgr_mode_unset(struct s2m_chgr *priv)
{
int ret;
ret = regmap_clear_bits(priv->regmap, S2MU005_REG_CHGR_CTRL15,
S2MU005_CHGR_OTG_EN);
if (ret) {
dev_err(priv->dev, "failed to turn off OTG (%d)\n", ret);
return ret;
}
ret = regmap_clear_bits(priv->regmap, S2MU005_REG_CHGR_CTRL0,
S2MU005_CHGR_OP_MODE);
if (ret) {
dev_err(priv->dev, "failed to reset opmode (%d)\n", ret);
return ret;
}
return 0;
}
static void s2mu005_chgr_extcon_work(struct work_struct *work)
{
struct s2m_chgr *priv = container_of(work, struct s2m_chgr, extcon_work);
if (extcon_get_state(priv->extcon, EXTCON_USB_HOST) > 0)
s2mu005_chgr_mode_set_host(priv);
else if (extcon_get_state(priv->extcon, EXTCON_USB) > 0)
s2mu005_chgr_mode_set_charger(priv);
else
s2mu005_chgr_mode_unset(priv);
power_supply_changed(priv->psy);
}
static const enum power_supply_property s2mu005_chgr_properties[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_USB_TYPE,
};
static const struct power_supply_desc s2mu005_chgr_psy_desc = {
.name = "s2mu005-charger",
.type = POWER_SUPPLY_TYPE_USB,
.properties = s2mu005_chgr_properties,
.num_properties = ARRAY_SIZE(s2mu005_chgr_properties),
.get_property = s2mu005_chgr_get_property,
.usb_types = BIT(POWER_SUPPLY_USB_TYPE_CDP) |
BIT(POWER_SUPPLY_USB_TYPE_SDP) |
BIT(POWER_SUPPLY_USB_TYPE_DCP) |
BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN),
};
static int s2m_chgr_extcon_notifier(struct notifier_block *nb,
unsigned long event, void *param)
{
struct s2m_chgr *priv = container_of(nb, struct s2m_chgr, extcon_nb);
schedule_work(&priv->extcon_work);
return NOTIFY_OK;
}
static int s2m_chgr_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sec_pmic_dev *pmic_drvdata = dev_get_drvdata(dev->parent);
struct s2m_chgr *priv;
struct device_node *extcon_node __free(device_node) = NULL;
struct power_supply_config psy_cfg = {};
const struct power_supply_desc *psy_desc;
work_func_t extcon_work_func;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->dev = dev;
priv->regmap = pmic_drvdata->regmap_pmic;
switch (platform_get_device_id(pdev)->driver_data) {
case S2MU005:
psy_desc = &s2mu005_chgr_psy_desc;
extcon_work_func = s2mu005_chgr_extcon_work;
break;
default:
return dev_err_probe(dev, -ENODEV,
"device type %d is not supported by driver\n",
pmic_drvdata->device_type);
}
extcon_node = of_get_child_by_name(dev->parent->of_node, "muic");
if (!extcon_node)
return dev_err_probe(dev, -ENODEV, "MUIC node required but not found\n");
priv->extcon = extcon_find_edev_by_node(extcon_node);
if (IS_ERR(priv->extcon))
return -EPROBE_DEFER;
psy_cfg.drv_data = priv;
psy_cfg.fwnode = dev_fwnode(dev->parent);
priv->psy = devm_power_supply_register(dev, psy_desc, &psy_cfg);
if (IS_ERR(priv->psy))
return dev_err_probe(dev, PTR_ERR(priv->psy),
"failed to register power supply subsystem\n");
ret = devm_work_autocancel(dev, &priv->extcon_work, extcon_work_func);
if (ret)
return dev_err_probe(dev, ret, "failed to initialize extcon work\n");
priv->extcon_nb.notifier_call = s2m_chgr_extcon_notifier;
ret = devm_extcon_register_notifier_all(dev, priv->extcon, &priv->extcon_nb);
if (ret)
return dev_err_probe(dev, ret, "failed to register extcon notifier\n");
return 0;
}
static const struct platform_device_id s2m_chgr_id_table[] = {
{ "s2mu005-charger", S2MU005 },
{ },
};
MODULE_DEVICE_TABLE(platform, s2m_chgr_id_table);
static struct platform_driver s2m_chgr_driver = {
.driver = {
.name = "s2m-charger",
},
.probe = s2m_chgr_probe,
.id_table = s2m_chgr_id_table,
};
module_platform_driver(s2m_chgr_driver);
MODULE_DESCRIPTION("Battery Charger Driver For Samsung S2M Series PMICs");
MODULE_AUTHOR("Kaustabh Chakraborty <kauschluss@disroot.org>");
MODULE_AUTHOR("Łukasz Lebiedziński <kernel@lvkasz.us>");
MODULE_LICENSE("GPL");
