drivers/power/act8945a_charger.c - kernel/quantenna - Git at Google

 /*
  * Power supply driver for the Active-semi ACT8945A PMIC
  *
  * Copyright (C) 2015 Atmel Corporation
  *
  * Author: Wenyou Yang <wenyou.yang@atmel.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  */
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/regmap.h>

 static const char *act8945a_charger_model = "ACT8945A";
 static const char *act8945a_charger_manufacturer = "Active-semi";

 /**
  * ACT8945A Charger Register Map
  */

 /* 0x70: Reserved */
 #define ACT8945A_APCH_CFG		0x71
 #define ACT8945A_APCH_STATUS		0x78
 #define ACT8945A_APCH_CTRL		0x79
 #define ACT8945A_APCH_STATE		0x7A

 /* ACT8945A_APCH_CFG */
 #define APCH_CFG_OVPSET			(0x3 << 0)
 #define APCH_CFG_OVPSET_6V6		(0x0 << 0)
 #define APCH_CFG_OVPSET_7V		(0x1 << 0)
 #define APCH_CFG_OVPSET_7V5		(0x2 << 0)
 #define APCH_CFG_OVPSET_8V		(0x3 << 0)
 #define APCH_CFG_PRETIMO		(0x3 << 2)
 #define APCH_CFG_PRETIMO_40_MIN		(0x0 << 2)
 #define APCH_CFG_PRETIMO_60_MIN		(0x1 << 2)
 #define APCH_CFG_PRETIMO_80_MIN		(0x2 << 2)
 #define APCH_CFG_PRETIMO_DISABLED	(0x3 << 2)
 #define APCH_CFG_TOTTIMO		(0x3 << 4)
 #define APCH_CFG_TOTTIMO_3_HOUR		(0x0 << 4)
 #define APCH_CFG_TOTTIMO_4_HOUR		(0x1 << 4)
 #define APCH_CFG_TOTTIMO_5_HOUR		(0x2 << 4)
 #define APCH_CFG_TOTTIMO_DISABLED	(0x3 << 4)
 #define APCH_CFG_SUSCHG			(0x1 << 7)

 #define APCH_STATUS_CHGDAT		BIT(0)
 #define APCH_STATUS_INDAT		BIT(1)
 #define APCH_STATUS_TEMPDAT		BIT(2)
 #define APCH_STATUS_TIMRDAT		BIT(3)
 #define APCH_STATUS_CHGSTAT		BIT(4)
 #define APCH_STATUS_INSTAT		BIT(5)
 #define APCH_STATUS_TEMPSTAT		BIT(6)
 #define APCH_STATUS_TIMRSTAT		BIT(7)

 #define APCH_CTRL_CHGEOCOUT		BIT(0)
 #define APCH_CTRL_INDIS			BIT(1)
 #define APCH_CTRL_TEMPOUT		BIT(2)
 #define APCH_CTRL_TIMRPRE		BIT(3)
 #define APCH_CTRL_CHGEOCIN		BIT(4)
 #define APCH_CTRL_INCON			BIT(5)
 #define APCH_CTRL_TEMPIN		BIT(6)
 #define APCH_CTRL_TIMRTOT		BIT(7)

 #define APCH_STATE_ACINSTAT		(0x1 << 1)
 #define APCH_STATE_CSTATE		(0x3 << 4)
 #define APCH_STATE_CSTATE_SHIFT		4
 #define APCH_STATE_CSTATE_DISABLED	0x00
 #define APCH_STATE_CSTATE_EOC		0x01
 #define APCH_STATE_CSTATE_FAST		0x02
 #define APCH_STATE_CSTATE_PRE		0x03

 struct act8945a_charger {
 	struct regmap *regmap;
 	bool battery_temperature;
 };

 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
 {
 	int ret;
 	unsigned int status, state;

 	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
 	if (ret < 0)
 		return ret;

 	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
 	if (ret < 0)
 		return ret;

 	state &= APCH_STATE_CSTATE;
 	state >>= APCH_STATE_CSTATE_SHIFT;

 	if (state == APCH_STATE_CSTATE_EOC) {
 		if (status & APCH_STATUS_CHGDAT)
 			*val = POWER_SUPPLY_STATUS_FULL;
 		else
 			*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
 	} else if ((state == APCH_STATE_CSTATE_FAST) ||
 		   (state == APCH_STATE_CSTATE_PRE)) {
 		*val = POWER_SUPPLY_STATUS_CHARGING;
 	} else {
 		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
 	}

 	return 0;
 }

 static int act8945a_get_charge_type(struct regmap *regmap, int *val)
 {
 	int ret;
 	unsigned int state;

 	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
 	if (ret < 0)
 		return ret;

 	state &= APCH_STATE_CSTATE;
 	state >>= APCH_STATE_CSTATE_SHIFT;

 	switch (state) {
 	case APCH_STATE_CSTATE_PRE:
 		*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 		break;
 	case APCH_STATE_CSTATE_FAST:
 		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
 		break;
 	case APCH_STATE_CSTATE_EOC:
 	case APCH_STATE_CSTATE_DISABLED:
 	default:
 		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
 	}

 	return 0;
 }

 static int act8945a_get_battery_health(struct act8945a_charger *charger,
 				       struct regmap *regmap, int *val)
 {
 	int ret;
 	unsigned int status;

 	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
 	if (ret < 0)
 		return ret;

 	if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT))
 		*val = POWER_SUPPLY_HEALTH_OVERHEAT;
 	else if (!(status & APCH_STATUS_INDAT))
 		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 	else if (status & APCH_STATUS_TIMRDAT)
 		*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 	else
 		*val = POWER_SUPPLY_HEALTH_GOOD;

 	return 0;
 }

 static enum power_supply_property act8945a_charger_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_CHARGE_TYPE,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER
 };

 static int act8945a_charger_get_property(struct power_supply *psy,
 					 enum power_supply_property prop,
 					 union power_supply_propval *val)
 {
 	struct act8945a_charger *charger = power_supply_get_drvdata(psy);
 	struct regmap *regmap = charger->regmap;
 	int ret = 0;

 	switch (prop) {
 	case POWER_SUPPLY_PROP_STATUS:
 		ret = act8945a_get_charger_state(regmap, &val->intval);
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_TYPE:
 		ret = act8945a_get_charge_type(regmap, &val->intval);
 		break;
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
 		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
 		ret = act8945a_get_battery_health(charger,
 						  regmap, &val->intval);
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = act8945a_charger_model;
 		break;
 	case POWER_SUPPLY_PROP_MANUFACTURER:
 		val->strval = act8945a_charger_manufacturer;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return ret;
 }

 static const struct power_supply_desc act8945a_charger_desc = {
 	.name		= "act8945a-charger",
 	.type		= POWER_SUPPLY_TYPE_BATTERY,
 	.get_property	= act8945a_charger_get_property,
 	.properties	= act8945a_charger_props,
 	.num_properties	= ARRAY_SIZE(act8945a_charger_props),
 };

 #define DEFAULT_TOTAL_TIME_OUT		3
 #define DEFAULT_PRE_TIME_OUT		40
 #define DEFAULT_INPUT_OVP_THRESHOLD	6600

 static int act8945a_charger_config(struct device *dev,
 				   struct act8945a_charger *charger)
 {
 	struct device_node *np = dev->of_node;
 	enum of_gpio_flags flags;
 	struct regmap *regmap = charger->regmap;

 	u32 total_time_out;
 	u32 pre_time_out;
 	u32 input_voltage_threshold;
 	int chglev_pin;

 	unsigned int value = 0;

 	if (!np) {
 		dev_err(dev, "no charger of node\n");
 		return -EINVAL;
 	}

 	charger->battery_temperature = of_property_read_bool(np,
 				"active-semi,check-battery-temperature");

 	chglev_pin = of_get_named_gpio_flags(np,
 				"active-semi,chglev-gpios", 0, &flags);

 	if (gpio_is_valid(chglev_pin)) {
 		gpio_set_value(chglev_pin,
 			       ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
 	}

 	if (of_property_read_u32(np,
 				 "active-semi,input-voltage-threshold-microvolt",
 				 &input_voltage_threshold))
 		input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;

 	if (of_property_read_u32(np,
 				 "active-semi,precondition-timeout",
 				 &pre_time_out))
 		pre_time_out = DEFAULT_PRE_TIME_OUT;

 	if (of_property_read_u32(np, "active-semi,total-timeout",
 				 &total_time_out))
 		total_time_out = DEFAULT_TOTAL_TIME_OUT;

 	switch (input_voltage_threshold) {
 	case 8000:
 		value |= APCH_CFG_OVPSET_8V;
 		break;
 	case 7500:
 		value |= APCH_CFG_OVPSET_7V5;
 		break;
 	case 7000:
 		value |= APCH_CFG_OVPSET_7V;
 		break;
 	case 6600:
 	default:
 		value |= APCH_CFG_OVPSET_6V6;
 		break;
 	}

 	switch (pre_time_out) {
 	case 60:
 		value |= APCH_CFG_PRETIMO_60_MIN;
 		break;
 	case 80:
 		value |= APCH_CFG_PRETIMO_80_MIN;
 		break;
 	case 0:
 		value |= APCH_CFG_PRETIMO_DISABLED;
 		break;
 	case 40:
 	default:
 		value |= APCH_CFG_PRETIMO_40_MIN;
 		break;
 	}

 	switch (total_time_out) {
 	case 4:
 		value |= APCH_CFG_TOTTIMO_4_HOUR;
 		break;
 	case 5:
 		value |= APCH_CFG_TOTTIMO_5_HOUR;
 		break;
 	case 0:
 		value |= APCH_CFG_TOTTIMO_DISABLED;
 		break;
 	case 3:
 	default:
 		value |= APCH_CFG_TOTTIMO_3_HOUR;
 		break;
 	}

 	return regmap_write(regmap, ACT8945A_APCH_CFG, value);
 }

 static int act8945a_charger_probe(struct platform_device *pdev)
 {
 	struct act8945a_charger *charger;
 	struct power_supply *psy;
 	struct power_supply_config psy_cfg = {};
 	int ret;

 	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
 	if (!charger)
 		return -ENOMEM;

 	charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!charger->regmap) {
 		dev_err(&pdev->dev, "Parent did not provide regmap\n");
 		return -EINVAL;
 	}

 	ret = act8945a_charger_config(pdev->dev.parent, charger);
 	if (ret)
 		return ret;

 	psy_cfg.of_node	= pdev->dev.parent->of_node;
 	psy_cfg.drv_data = charger;

 	psy = devm_power_supply_register(&pdev->dev,
 					 &act8945a_charger_desc,
 					 &psy_cfg);
 	if (IS_ERR(psy)) {
 		dev_err(&pdev->dev, "failed to register power supply\n");
 		return PTR_ERR(psy);
 	}

 	return 0;
 }

 static struct platform_driver act8945a_charger_driver = {
 	.driver	= {
 		.name = "act8945a-charger",
 	},
 	.probe	= act8945a_charger_probe,
 };
 module_platform_driver(act8945a_charger_driver);

 MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
 MODULE_LICENSE("GPL");
	/*
	* Power supply driver for the Active-semi ACT8945A PMIC
	*
	* Copyright (C) 2015 Atmel Corporation
	*
	* Author: Wenyou Yang <wenyou.yang@atmel.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	*/
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/regmap.h>

	static const char *act8945a_charger_model = "ACT8945A";
	static const char *act8945a_charger_manufacturer = "Active-semi";

	/**
	* ACT8945A Charger Register Map
	*/

	/* 0x70: Reserved */
	#define ACT8945A_APCH_CFG 0x71
	#define ACT8945A_APCH_STATUS 0x78
	#define ACT8945A_APCH_CTRL 0x79
	#define ACT8945A_APCH_STATE 0x7A

	/* ACT8945A_APCH_CFG */
	#define APCH_CFG_OVPSET (0x3 << 0)
	#define APCH_CFG_OVPSET_6V6 (0x0 << 0)
	#define APCH_CFG_OVPSET_7V (0x1 << 0)
	#define APCH_CFG_OVPSET_7V5 (0x2 << 0)
	#define APCH_CFG_OVPSET_8V (0x3 << 0)
	#define APCH_CFG_PRETIMO (0x3 << 2)
	#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
	#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
	#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
	#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
	#define APCH_CFG_TOTTIMO (0x3 << 4)
	#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
	#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
	#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
	#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
	#define APCH_CFG_SUSCHG (0x1 << 7)

	#define APCH_STATUS_CHGDAT BIT(0)
	#define APCH_STATUS_INDAT BIT(1)
	#define APCH_STATUS_TEMPDAT BIT(2)
	#define APCH_STATUS_TIMRDAT BIT(3)
	#define APCH_STATUS_CHGSTAT BIT(4)
	#define APCH_STATUS_INSTAT BIT(5)
	#define APCH_STATUS_TEMPSTAT BIT(6)
	#define APCH_STATUS_TIMRSTAT BIT(7)

	#define APCH_CTRL_CHGEOCOUT BIT(0)
	#define APCH_CTRL_INDIS BIT(1)
	#define APCH_CTRL_TEMPOUT BIT(2)
	#define APCH_CTRL_TIMRPRE BIT(3)
	#define APCH_CTRL_CHGEOCIN BIT(4)
	#define APCH_CTRL_INCON BIT(5)
	#define APCH_CTRL_TEMPIN BIT(6)
	#define APCH_CTRL_TIMRTOT BIT(7)

	#define APCH_STATE_ACINSTAT (0x1 << 1)
	#define APCH_STATE_CSTATE (0x3 << 4)
	#define APCH_STATE_CSTATE_SHIFT 4
	#define APCH_STATE_CSTATE_DISABLED 0x00
	#define APCH_STATE_CSTATE_EOC 0x01
	#define APCH_STATE_CSTATE_FAST 0x02
	#define APCH_STATE_CSTATE_PRE 0x03

	struct act8945a_charger {
	struct regmap *regmap;
	bool battery_temperature;
	};

	static int act8945a_get_charger_state(struct regmap regmap, int val)
	{
	int ret;
	unsigned int status, state;

	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	if (ret < 0)
	return ret;

	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	if (ret < 0)
	return ret;

	state &= APCH_STATE_CSTATE;
	state >>= APCH_STATE_CSTATE_SHIFT;

	if (state == APCH_STATE_CSTATE_EOC) {
	if (status & APCH_STATUS_CHGDAT)
	*val = POWER_SUPPLY_STATUS_FULL;
	else
	*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
	} else if ((state == APCH_STATE_CSTATE_FAST) \|\|
	(state == APCH_STATE_CSTATE_PRE)) {
	*val = POWER_SUPPLY_STATUS_CHARGING;
	} else {
	*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
	}

	return 0;
	}

	static int act8945a_get_charge_type(struct regmap regmap, int val)
	{
	int ret;
	unsigned int state;

	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	if (ret < 0)
	return ret;

	state &= APCH_STATE_CSTATE;
	state >>= APCH_STATE_CSTATE_SHIFT;

	switch (state) {
	case APCH_STATE_CSTATE_PRE:
	*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
	break;
	case APCH_STATE_CSTATE_FAST:
	*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
	break;
	case APCH_STATE_CSTATE_EOC:
	case APCH_STATE_CSTATE_DISABLED:
	default:
	*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
	}

	return 0;
	}

	static int act8945a_get_battery_health(struct act8945a_charger *charger,
	struct regmap regmap, int val)
	{
	int ret;
	unsigned int status;

	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	if (ret < 0)
	return ret;

	if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT))
	*val = POWER_SUPPLY_HEALTH_OVERHEAT;
	else if (!(status & APCH_STATUS_INDAT))
	*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	else if (status & APCH_STATUS_TIMRDAT)
	*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
	else
	*val = POWER_SUPPLY_HEALTH_GOOD;

	return 0;
	}

	static enum power_supply_property act8945a_charger_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER
	};

	static int act8945a_charger_get_property(struct power_supply *psy,
	enum power_supply_property prop,
	union power_supply_propval *val)
	{
	struct act8945a_charger *charger = power_supply_get_drvdata(psy);
	struct regmap *regmap = charger->regmap;
	int ret = 0;

	switch (prop) {
	case POWER_SUPPLY_PROP_STATUS:
	ret = act8945a_get_charger_state(regmap, &val->intval);
	break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
	ret = act8945a_get_charge_type(regmap, &val->intval);
	break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	break;
	case POWER_SUPPLY_PROP_HEALTH:
	ret = act8945a_get_battery_health(charger,
	regmap, &val->intval);
	break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
	val->strval = act8945a_charger_model;
	break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
	val->strval = act8945a_charger_manufacturer;
	break;
	default:
	return -EINVAL;
	}

	return ret;
	}

	static const struct power_supply_desc act8945a_charger_desc = {
	.name = "act8945a-charger",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.get_property = act8945a_charger_get_property,
	.properties = act8945a_charger_props,
	.num_properties = ARRAY_SIZE(act8945a_charger_props),
	};

	#define DEFAULT_TOTAL_TIME_OUT 3
	#define DEFAULT_PRE_TIME_OUT 40
	#define DEFAULT_INPUT_OVP_THRESHOLD 6600

	static int act8945a_charger_config(struct device *dev,
	struct act8945a_charger *charger)
	{
	struct device_node *np = dev->of_node;
	enum of_gpio_flags flags;
	struct regmap *regmap = charger->regmap;

	u32 total_time_out;
	u32 pre_time_out;
	u32 input_voltage_threshold;
	int chglev_pin;

	unsigned int value = 0;

	if (!np) {
	dev_err(dev, "no charger of node\n");
	return -EINVAL;
	}

	charger->battery_temperature = of_property_read_bool(np,
	"active-semi,check-battery-temperature");

	chglev_pin = of_get_named_gpio_flags(np,
	"active-semi,chglev-gpios", 0, &flags);

	if (gpio_is_valid(chglev_pin)) {
	gpio_set_value(chglev_pin,
	((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
	}

	if (of_property_read_u32(np,
	"active-semi,input-voltage-threshold-microvolt",
	&input_voltage_threshold))
	input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;

	if (of_property_read_u32(np,
	"active-semi,precondition-timeout",
	&pre_time_out))
	pre_time_out = DEFAULT_PRE_TIME_OUT;

	if (of_property_read_u32(np, "active-semi,total-timeout",
	&total_time_out))
	total_time_out = DEFAULT_TOTAL_TIME_OUT;

	switch (input_voltage_threshold) {
	case 8000:
	value \|= APCH_CFG_OVPSET_8V;
	break;
	case 7500:
	value \|= APCH_CFG_OVPSET_7V5;
	break;
	case 7000:
	value \|= APCH_CFG_OVPSET_7V;
	break;
	case 6600:
	default:
	value \|= APCH_CFG_OVPSET_6V6;
	break;
	}

	switch (pre_time_out) {
	case 60:
	value \|= APCH_CFG_PRETIMO_60_MIN;
	break;
	case 80:
	value \|= APCH_CFG_PRETIMO_80_MIN;
	break;
	case 0:
	value \|= APCH_CFG_PRETIMO_DISABLED;
	break;
	case 40:
	default:
	value \|= APCH_CFG_PRETIMO_40_MIN;
	break;
	}

	switch (total_time_out) {
	case 4:
	value \|= APCH_CFG_TOTTIMO_4_HOUR;
	break;
	case 5:
	value \|= APCH_CFG_TOTTIMO_5_HOUR;
	break;
	case 0:
	value \|= APCH_CFG_TOTTIMO_DISABLED;
	break;
	case 3:
	default:
	value \|= APCH_CFG_TOTTIMO_3_HOUR;
	break;
	}

	return regmap_write(regmap, ACT8945A_APCH_CFG, value);
	}

	static int act8945a_charger_probe(struct platform_device *pdev)
	{
	struct act8945a_charger *charger;
	struct power_supply *psy;
	struct power_supply_config psy_cfg = {};
	int ret;

	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
	if (!charger)
	return -ENOMEM;

	charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!charger->regmap) {
	dev_err(&pdev->dev, "Parent did not provide regmap\n");
	return -EINVAL;
	}

	ret = act8945a_charger_config(pdev->dev.parent, charger);
	if (ret)
	return ret;

	psy_cfg.of_node = pdev->dev.parent->of_node;
	psy_cfg.drv_data = charger;

	psy = devm_power_supply_register(&pdev->dev,
	&act8945a_charger_desc,
	&psy_cfg);
	if (IS_ERR(psy)) {
	dev_err(&pdev->dev, "failed to register power supply\n");
	return PTR_ERR(psy);
	}

	return 0;
	}

	static struct platform_driver act8945a_charger_driver = {
	.driver = {
	.name = "act8945a-charger",
	},
	.probe = act8945a_charger_probe,
	};
	module_platform_driver(act8945a_charger_driver);

	MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
	MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
	MODULE_LICENSE("GPL");