// SPDX-License-Identifier: GPL-2.0-only
/*
 * rk818 usb power driver
 *
 * Copyright (c) 2021 Ondřej Jirman <megi@xff.cz>
 */
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/mfd/rk808.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>

#define RK818_CHG_STS_MASK		(7u << 4) /* charger status */
#define RK818_CHG_STS_NONE		(0u << 4)
#define RK818_CHG_STS_WAKEUP_CUR	(1u << 4)
#define RK818_CHG_STS_TRICKLE_CUR	(2u << 4)
#define RK818_CHG_STS_CC_OR_CV		(3u << 4)
#define RK818_CHG_STS_TERMINATED	(4u << 4)
#define RK818_CHG_STS_USB_OV		(5u << 4)
#define RK818_CHG_STS_BAT_TEMP_FAULT	(6u << 4)
#define RK818_CHG_STS_TIMEOUT		(7u << 4)

/* RK818_SUP_STS_REG */
#define RK818_SUP_STS_USB_VLIM_EN	BIT(3) /* input voltage limit enable */
#define RK818_SUP_STS_USB_ILIM_EN	BIT(2) /* input current limit enable */
#define RK818_SUP_STS_USB_EXS		BIT(1) /* USB power connected */
#define RK818_SUP_STS_USB_EFF		BIT(0) /* USB fault */

/* RK818_USB_CTRL_REG */
#define RK818_USB_CTRL_USB_ILIM_MASK		(0xfu)
#define RK818_USB_CTRL_USB_CHG_SD_VSEL_OFFSET	4
#define RK818_USB_CTRL_USB_CHG_SD_VSEL_MASK	(0x7u << 4)

/* RK818_CHRG_CTRL_REG1 */
#define RK818_CHRG_CTRL_REG1_CHRG_EN	BIT(7)
#define RK818_CHRG_CTRL_REG1_CHRG_VOL_SEL_OFFSET 4
#define RK818_CHRG_CTRL_REG1_CHRG_VOL_SEL_MASK	(0x7u << 4)
#define RK818_CHRG_CTRL_REG1_CHRG_CUR_SEL_OFFSET 0
#define RK818_CHRG_CTRL_REG1_CHRG_CUR_SEL_MASK	(0xfu << 0)

/* RK818_CHRG_CTRL_REG3 */
#define RK818_CHRG_CTRL_REG3_CHRG_TERM_DIGITAL	BIT(5)

struct rk818_charger {
	struct device *dev;
	struct rk808 *rk818;
	struct regmap *regmap;

	struct power_supply *usb_psy;
	struct power_supply *charger_psy;

	bool apply_ilim;
};

// {{{ USB supply

static int rk818_usb_set_input_current_max(struct rk818_charger *cg,
					   int val)
{
	int ret;
	unsigned reg;

	if (val < 450000)
		reg = 1;
	else if (val < 850000)
		reg = 0;
	else if (val < 1000000)
		reg = 2;
	else if (val < 3000000)
		reg = 3 + (val - 1000000) / 250000;
	else
		reg = 11;

	dev_info(cg->dev, "applying input current limit %d mA\n", val / 1000);

	ret = regmap_update_bits(cg->regmap, RK818_USB_CTRL_REG,
				 RK818_USB_CTRL_USB_ILIM_MASK, reg);
	if (ret)
		dev_err(cg->dev,
			"USB input current limit setting failed (%d)\n", ret);

	return ret;
}

static int rk818_usb_get_input_current_max(struct rk818_charger *cg,
					   int *val)
{
	unsigned reg;
	int ret;

	ret = regmap_read(cg->regmap, RK818_USB_CTRL_REG, &reg);
	if (ret) {
		dev_err(cg->dev,
			"USB input current limit getting failed (%d)\n", ret);
		return ret;
	}

	reg &= RK818_USB_CTRL_USB_ILIM_MASK;
	if (reg == 0)
		*val = 450000;
	else if (reg == 1)
		*val = 80000;
	else if (reg == 2)
		*val = 850000;
	else if (reg < 11)
		*val = 1000000 + (reg - 3) * 250000;
	else
		*val = 3000000;

	return 0;
}

static int rk818_usb_set_input_voltage_min(struct rk818_charger *cg,
					   int val)
{
	unsigned reg;
	int ret;

	if (val < 2780000)
		reg = 0;
	else if (val < 3270000)
		reg = (val - 2780000) / 70000;
	else
		reg = 7;

	ret = regmap_update_bits(cg->regmap, RK818_USB_CTRL_REG,
				 RK818_USB_CTRL_USB_CHG_SD_VSEL_MASK,
				 reg << RK818_USB_CTRL_USB_CHG_SD_VSEL_OFFSET);
	if (ret)
		dev_err(cg->dev,
			"USB input voltage limit setting failed (%d)\n", ret);

	return ret;
}

static int rk818_usb_get_input_voltage_min(struct rk818_charger *cg,
					   int *val)
{
	unsigned reg;
	int ret;

	ret = regmap_read(cg->regmap, RK818_USB_CTRL_REG, &reg);
	if (ret) {
		dev_err(cg->dev,
			"USB input voltage limit getting failed (%d)\n", ret);
		return ret;
	}

	reg &= RK818_USB_CTRL_USB_CHG_SD_VSEL_MASK;
	reg >>= RK818_USB_CTRL_USB_CHG_SD_VSEL_OFFSET;

	*val = 2780000 + (reg * 70000);

	return 0;
}

static int rk818_usb_power_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	struct rk818_charger *cg = power_supply_get_drvdata(psy);
	unsigned reg;
	int ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
		ret = regmap_read(cg->regmap, RK818_SUP_STS_REG, &reg);
		if (ret)
			return ret;

		val->intval = !!(reg & RK818_SUP_STS_USB_EXS);
		break;

	case POWER_SUPPLY_PROP_HEALTH:
		ret = regmap_read(cg->regmap, RK818_SUP_STS_REG, &reg);
		if (ret)
			return ret;

		if (!(reg & RK818_SUP_STS_USB_EXS)) {
			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
		} else if (reg & RK818_SUP_STS_USB_EFF) {
			val->intval = POWER_SUPPLY_HEALTH_GOOD;
		} else {
			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
		}

		break;

	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
                return rk818_usb_get_input_voltage_min(cg, &val->intval);

	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                return rk818_usb_get_input_current_max(cg, &val->intval);

	default:
		return -EINVAL;
	}

	return 0;
}

static int rk818_usb_power_set_property(struct power_supply *psy,
					enum power_supply_property psp,
					const union power_supply_propval *val)
{
	struct rk818_charger *cg = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
                return rk818_usb_set_input_voltage_min(cg, val->intval);

	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                return rk818_usb_set_input_current_max(cg, val->intval);

	default:
		return -EINVAL;
	}
}

static int rk818_usb_power_prop_writeable(struct power_supply *psy,
					  enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
		return 1;

	default:
		return 0;
	}
}

/* Sync the input-current-limit with our parent supply (if we have one) */
static void rk818_usb_power_external_power_changed(struct power_supply *psy)
{
        struct rk818_charger *cg = power_supply_get_drvdata(psy);
	union power_supply_propval val;
	int ret;

	ret = power_supply_get_property_from_supplier(cg->usb_psy,
						      POWER_SUPPLY_PROP_CURRENT_MAX,
						      &val);
	if (ret)
		return;

	/*
	 * We only want to start applying input current limit after we get first
	 * non-0 value from the supplier. Until then, we keep the limit applied
	 * by the bootloader. If we lower the limit before the charger is properly
	 * detected, we risk boot failure due to insufficient power.
	 */
	if (!cg->apply_ilim) {
		if (!val.intval)
			return;

		cg->apply_ilim = true;
	}

	if (val.intval < 500000)
		val.intval = 500000;

	rk818_usb_power_set_property(cg->usb_psy,
				     POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
				     &val);
}

static enum power_supply_property rk818_usb_power_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
	POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
};

static const struct power_supply_desc rk818_usb_desc = {
	.name			= "rk818-usb",
	.type			= POWER_SUPPLY_TYPE_USB,
	.properties		= rk818_usb_power_props,
	.num_properties		= ARRAY_SIZE(rk818_usb_power_props),
	.property_is_writeable	= rk818_usb_power_prop_writeable,
	.get_property		= rk818_usb_power_get_property,
	.set_property		= rk818_usb_power_set_property,
	.external_power_changed	= rk818_usb_power_external_power_changed,
};

// }}}
// {{{ Charger supply

static int rk818_charger_set_current_max(struct rk818_charger *cg, int val)
{
	unsigned reg;
	int ret;

	if (val < 1000000)
		reg = 0;
	else if (val < 3000000)
		reg = (val - 1000000) / 200000;
	else
		reg = 10;

	ret = regmap_update_bits(cg->regmap, RK818_CHRG_CTRL_REG1,
				 RK818_CHRG_CTRL_REG1_CHRG_CUR_SEL_MASK,
				 reg << RK818_CHRG_CTRL_REG1_CHRG_CUR_SEL_OFFSET);
	if (ret)
		dev_err(cg->dev,
			"Charging max current setting failed (%d)\n", ret);

	return ret;
}

static int rk818_charger_get_current_max(struct rk818_charger *cg, int *val)
{
	unsigned reg;
	int ret;

	ret = regmap_read(cg->regmap, RK818_CHRG_CTRL_REG1, &reg);
	if (ret) {
		dev_err(cg->dev,
			"Charging max current getting failed (%d)\n", ret);
		return ret;
	}

	reg &= RK818_CHRG_CTRL_REG1_CHRG_CUR_SEL_MASK;
	reg >>= RK818_CHRG_CTRL_REG1_CHRG_CUR_SEL_OFFSET;

	*val = 1000000 + reg * 200000;

	return 0;
}

static int rk818_charger_set_voltage_max(struct rk818_charger *cg, int val)
{
	unsigned reg;
	int ret;

	if (val < 4050000)
		reg = 0;
	else if (val < 4350000)
		reg = (val - 4050000) / 50000;
	else
		reg = 6;

	ret = regmap_update_bits(cg->regmap, RK818_CHRG_CTRL_REG1,
				 RK818_CHRG_CTRL_REG1_CHRG_VOL_SEL_MASK,
				 reg << RK818_CHRG_CTRL_REG1_CHRG_VOL_SEL_OFFSET);
	if (ret)
		dev_err(cg->dev,
			"Charging end voltage setting failed (%d)\n", ret);

	return ret;
}

static int rk818_charger_get_voltage_max(struct rk818_charger *cg, int *val)
{
	unsigned reg;
	int ret;

	ret = regmap_read(cg->regmap, RK818_CHRG_CTRL_REG1, &reg);
	if (ret) {
		dev_err(cg->dev,
			"Charging end voltage getting failed (%d)\n", ret);
		return ret;
	}

	reg &= RK818_CHRG_CTRL_REG1_CHRG_VOL_SEL_MASK;
	reg >>= RK818_CHRG_CTRL_REG1_CHRG_VOL_SEL_OFFSET;

	*val = 4050000 + reg * 50000;

	return 0;
}

struct rk818_battery;
struct rk818_battery* rk818_battery_get(void);
int rk818_battery_get_property(struct rk818_battery *di,
			       enum power_supply_property psp,
			       union power_supply_propval *val);

static int rk818_charger_get_property(struct power_supply *psy,
				      enum power_supply_property psp,
				      union power_supply_propval *val)
{
	struct rk818_charger *cg = power_supply_get_drvdata(psy);
	struct rk818_battery* di = rk818_battery_get();
	unsigned reg;
	int ret;

	switch (psp) {
		case POWER_SUPPLY_PROP_CURRENT_NOW:
		case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		case POWER_SUPPLY_PROP_PRESENT:
		case POWER_SUPPLY_PROP_CAPACITY:
		case POWER_SUPPLY_PROP_TEMP:
		case POWER_SUPPLY_PROP_STATUS:
		case POWER_SUPPLY_PROP_CHARGE_COUNTER:
		case POWER_SUPPLY_PROP_CHARGE_FULL:
			if (!di)
				return -ENODEV;
			return rk818_battery_get_property(di, psp, val);
		default:;
	}

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		ret = regmap_read(cg->regmap, RK818_CHRG_CTRL_REG1, &reg);
		if (ret) {
			dev_err(cg->dev, "failed to read the charger state (%d)\n", ret);
			return ret;
		}

		val->intval = !!(reg & RK818_CHRG_CTRL_REG1_CHRG_EN);
		break;

	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
		ret = regmap_read(cg->regmap, RK818_CHRG_CTRL_REG1, &reg);
		if (ret) {
			dev_err(cg->dev, "failed to read the charger state (%d)\n", ret);
			return ret;
		}

		if (reg & RK818_CHRG_CTRL_REG1_CHRG_EN)
			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO;
		else
			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE;

		return 0;

	case POWER_SUPPLY_PROP_STATUS:
		ret = regmap_read(cg->regmap, RK818_SUP_STS_REG, &reg);
		if (ret)
			return ret;

		switch (reg & RK818_CHG_STS_MASK) {
		case RK818_CHG_STS_WAKEUP_CUR:
		case RK818_CHG_STS_TRICKLE_CUR:
		case RK818_CHG_STS_CC_OR_CV:
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
			break;
		case RK818_CHG_STS_TERMINATED:
		default:
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
			break;
		}

		break;

	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		ret = regmap_read(cg->regmap, RK818_SUP_STS_REG, &reg);
		if (ret)
			return ret;

		switch (reg & RK818_CHG_STS_MASK) {
		case RK818_CHG_STS_WAKEUP_CUR:
		case RK818_CHG_STS_TRICKLE_CUR:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
			break;
		case RK818_CHG_STS_CC_OR_CV:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
			break;
		case RK818_CHG_STS_TERMINATED:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
			break;
		default:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
			break;
		}

		break;

	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
		ret = regmap_read(cg->regmap, RK818_CHRG_CTRL_REG2, &reg);
		if (ret)
			return ret;

		val->intval = 100000 + ((reg >> 6) & 3) * 50000;
		break;

	case POWER_SUPPLY_PROP_HEALTH:
		ret = regmap_read(cg->regmap, RK818_SUP_STS_REG, &reg);
		if (ret)
			return ret;

		switch (reg & RK818_CHG_STS_MASK) {
		case RK818_CHG_STS_USB_OV:
			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
			break;
		case RK818_CHG_STS_BAT_TEMP_FAULT:
			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
			break;
		case RK818_CHG_STS_TIMEOUT:
			val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
			break;
		default:
			val->intval = POWER_SUPPLY_HEALTH_GOOD;
			break;
		}

		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
                return rk818_charger_get_voltage_max(cg, &val->intval);

	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
                ret = rk818_charger_get_current_max(cg, &val->intval);
		val->intval /= 10;
		return ret;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
                return rk818_charger_get_current_max(cg, &val->intval);

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
		val->intval = 4350000;
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
		val->intval = 3000000;
		break;

	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
		val->intval = 11400000;
		return 0;

	case POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN:
		val->intval = 0;
		return 0;

	default:
		return -EINVAL;
	}

	return 0;
}

static int rk818_charger_set_property(struct power_supply *psy,
				      enum power_supply_property psp,
				      const union power_supply_propval *val)
{
	struct rk818_charger *cg = power_supply_get_drvdata(psy);
	int ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
		switch (val->intval) {
		case POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO:
			return regmap_update_bits(cg->regmap, RK818_CHRG_CTRL_REG1,
						  RK818_CHRG_CTRL_REG1_CHRG_EN,
						  RK818_CHRG_CTRL_REG1_CHRG_EN);
		case POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE:
			return regmap_update_bits(cg->regmap, RK818_CHRG_CTRL_REG1,
						  RK818_CHRG_CTRL_REG1_CHRG_EN, 0);
		default:
			return -EINVAL;
		}

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
                return rk818_charger_set_voltage_max(cg, val->intval);

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
                return rk818_charger_set_current_max(cg, val->intval);

	default:
		return -EINVAL;
	}
}

static int rk818_charger_prop_writeable(struct power_supply *psy,
					enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
		return 1;

	default:
		return 0;
	}
}

static enum power_supply_property rk818_charger_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
	POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN,

	// inherited from BSP battery driver
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_CHARGE_COUNTER,
	POWER_SUPPLY_PROP_CHARGE_FULL,
};

/*
 * We import some capacity tracking functionality from the BSP battery driver.
 * Some poor soul will have to understand and clean up the BSP battery driver,
 * but not me, not now. :)
 */
static const struct power_supply_desc rk818_charger_desc = {
	.name			= "rk818-battery",
	.type			= POWER_SUPPLY_TYPE_BATTERY,
	.properties		= rk818_charger_props,
	.num_properties		= ARRAY_SIZE(rk818_charger_props),
	.property_is_writeable	= rk818_charger_prop_writeable,
	.get_property		= rk818_charger_get_property,
	.set_property		= rk818_charger_set_property,
};

// }}}

static int rk818_charger_probe(struct platform_device *pdev)
{
	struct rk808 *rk818 = dev_get_drvdata(pdev->dev.parent);
	struct power_supply_config psy_cfg = { };
	struct device *dev = &pdev->dev;
	struct rk818_charger *cg;
	int ret;

	cg = devm_kzalloc(dev, sizeof(*cg), GFP_KERNEL);
	if (!cg)
		return -ENOMEM;

	cg->rk818 = rk818;
	cg->dev = dev;
	cg->regmap = rk818->regmap;
	platform_set_drvdata(pdev, cg);

	psy_cfg.drv_data = cg;
	psy_cfg.of_node = dev->of_node;

	cg->usb_psy = devm_power_supply_register(dev, &rk818_usb_desc,
						 &psy_cfg);
	if (IS_ERR(cg->usb_psy))
		return dev_err_probe(dev, PTR_ERR(cg->usb_psy),
				     "register usb power supply fail\n");

	cg->charger_psy = devm_power_supply_register(dev, &rk818_charger_desc,
						     &psy_cfg);
	if (IS_ERR(cg->charger_psy))
		return dev_err_probe(dev, PTR_ERR(cg->charger_psy),
				     "register charger power supply fail\n");

        /* disable voltage limit and enable input current limit */
	ret = regmap_update_bits(cg->regmap, RK818_SUP_STS_REG,
				 RK818_SUP_STS_USB_ILIM_EN | RK818_SUP_STS_USB_VLIM_EN,
				 RK818_SUP_STS_USB_ILIM_EN);
	if (ret)
		dev_warn(cg->dev, "failed to enable input current limit (%d)\n", ret);

        /* make sure analog control loop is enabled */
	ret = regmap_update_bits(cg->regmap, RK818_CHRG_CTRL_REG3,
				 RK818_CHRG_CTRL_REG3_CHRG_TERM_DIGITAL,
				 0);
	if (ret)
		dev_warn(cg->dev, "failed to enable analog control loop (%d)\n", ret);

        /* enable charger and set some reasonable limits on each boot */
	ret = regmap_write(cg->regmap, RK818_CHRG_CTRL_REG1,
			   RK818_CHRG_CTRL_REG1_CHRG_EN
			   | (1) /* 1.2A */
			   | (5 << 4) /* 4.3V */);
	if (ret)
		dev_warn(cg->dev, "failed to enable charger (%d)\n", ret);

	rk818_usb_power_external_power_changed(cg->usb_psy);

	return 0;
}

static int rk818_charger_remove(struct platform_device *pdev)
{
	//struct rk818_charger *cg = platform_get_drvdata(pdev);

	return 0;
}

static void rk818_charger_shutdown(struct platform_device *pdev)
{
}

static int rk818_charger_suspend(struct platform_device *pdev,
				 pm_message_t state)
{
	return 0;
}

static int rk818_charger_resume(struct platform_device *pdev)
{
	return 0;
}

static const struct of_device_id rk818_charger_of_match[] = {
	{ .compatible = "rockchip,rk818-charger", },
	{ },
};

static struct platform_driver rk818_charger_driver = {
	.probe = rk818_charger_probe,
	.remove = rk818_charger_remove,
	.suspend = rk818_charger_suspend,
	.resume = rk818_charger_resume,
	.shutdown = rk818_charger_shutdown,
	.driver = {
		.name	= "rk818-charger",
		.of_match_table = rk818_charger_of_match,
	},
};

module_platform_driver(rk818_charger_driver);

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk818-charger");
MODULE_AUTHOR("Ondřej Jirman <megi@xff.cz>");