drivers/power/max8925_power.c - linux/kernel/git/jmorris/linux-security - Git at Google

 /*
  * Battery driver for Maxim MAX8925
  *
  * Copyright (c) 2009-2010 Marvell International Ltd.
  *	Haojian Zhuang <haojian.zhuang@marvell.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/err.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/mfd/max8925.h>

 /* registers in GPM */
 #define MAX8925_OUT5VEN			0x54
 #define MAX8925_OUT3VEN			0x58
 #define MAX8925_CHG_CNTL1		0x7c

 /* bits definition */
 #define MAX8925_CHG_STAT_VSYSLOW	(1 << 0)
 #define MAX8925_CHG_STAT_MODE_MASK	(3 << 2)
 #define MAX8925_CHG_STAT_EN_MASK	(1 << 4)
 #define MAX8925_CHG_MBDET		(1 << 1)
 #define MAX8925_CHG_AC_RANGE_MASK	(3 << 6)

 /* registers in ADC */
 #define MAX8925_ADC_RES_CNFG1		0x06
 #define MAX8925_ADC_AVG_CNFG1		0x07
 #define MAX8925_ADC_ACQ_CNFG1		0x08
 #define MAX8925_ADC_ACQ_CNFG2		0x09
 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
 #define MAX8925_ADC_AUX2		0x62
 #define MAX8925_ADC_VCHG		0x64
 #define MAX8925_ADC_VBBATT		0x66
 #define MAX8925_ADC_VMBATT		0x68
 #define MAX8925_ADC_ISNS		0x6a
 #define MAX8925_ADC_THM			0x6c
 #define MAX8925_ADC_TDIE		0x6e
 #define MAX8925_CMD_AUX2		0xc8
 #define MAX8925_CMD_VCHG		0xd0
 #define MAX8925_CMD_VBBATT		0xd8
 #define MAX8925_CMD_VMBATT		0xe0
 #define MAX8925_CMD_ISNS		0xe8
 #define MAX8925_CMD_THM			0xf0
 #define MAX8925_CMD_TDIE		0xf8

 enum {
 	MEASURE_AUX2,
 	MEASURE_VCHG,
 	MEASURE_VBBATT,
 	MEASURE_VMBATT,
 	MEASURE_ISNS,
 	MEASURE_THM,
 	MEASURE_TDIE,
 	MEASURE_MAX,
 };

 struct max8925_power_info {
 	struct max8925_chip	*chip;
 	struct i2c_client	*gpm;
 	struct i2c_client	*adc;

 	struct power_supply	ac;
 	struct power_supply	usb;
 	struct power_supply	battery;
 	int			irq_base;
 	unsigned		ac_online:1;
 	unsigned		usb_online:1;
 	unsigned		bat_online:1;
 	unsigned		chg_mode:2;
 	unsigned		batt_detect:1;	/* detecing MB by ID pin */
 	unsigned		topoff_threshold:2;
 	unsigned		fast_charge:3;
 	unsigned		no_temp_support:1;
 	unsigned		no_insert_detect:1;

 	int (*set_charger) (int);
 };

 static int __set_charger(struct max8925_power_info *info, int enable)
 {
 	struct max8925_chip *chip = info->chip;
 	if (enable) {
 		/* enable charger in platform */
 		if (info->set_charger)
 			info->set_charger(1);
 		/* enable charger */
 		max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
 	} else {
 		/* disable charge */
 		max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 		if (info->set_charger)
 			info->set_charger(0);
 	}
 	dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
 		: "Disable charger");
 	return 0;
 }

 static irqreturn_t max8925_charger_handler(int irq, void *data)
 {
 	struct max8925_power_info *info = (struct max8925_power_info *)data;
 	struct max8925_chip *chip = info->chip;

 	switch (irq - chip->irq_base) {
 	case MAX8925_IRQ_VCHG_DC_R:
 		info->ac_online = 1;
 		__set_charger(info, 1);
 		dev_dbg(chip->dev, "Adapter inserted\n");
 		break;
 	case MAX8925_IRQ_VCHG_DC_F:
 		info->ac_online = 0;
 		__set_charger(info, 0);
 		dev_dbg(chip->dev, "Adapter removed\n");
 		break;
 	case MAX8925_IRQ_VCHG_THM_OK_F:
 		/* Battery is not ready yet */
 		dev_dbg(chip->dev, "Battery temperature is out of range\n");
 	case MAX8925_IRQ_VCHG_DC_OVP:
 		dev_dbg(chip->dev, "Error detection\n");
 		__set_charger(info, 0);
 		break;
 	case MAX8925_IRQ_VCHG_THM_OK_R:
 		/* Battery is ready now */
 		dev_dbg(chip->dev, "Battery temperature is in range\n");
 		break;
 	case MAX8925_IRQ_VCHG_SYSLOW_R:
 		/* VSYS is low */
 		dev_info(chip->dev, "Sys power is too low\n");
 		break;
 	case MAX8925_IRQ_VCHG_SYSLOW_F:
 		dev_dbg(chip->dev, "Sys power is above low threshold\n");
 		break;
 	case MAX8925_IRQ_VCHG_DONE:
 		__set_charger(info, 0);
 		dev_dbg(chip->dev, "Charging is done\n");
 		break;
 	case MAX8925_IRQ_VCHG_TOPOFF:
 		dev_dbg(chip->dev, "Charging in top-off mode\n");
 		break;
 	case MAX8925_IRQ_VCHG_TMR_FAULT:
 		__set_charger(info, 0);
 		dev_dbg(chip->dev, "Safe timer is expired\n");
 		break;
 	case MAX8925_IRQ_VCHG_RST:
 		__set_charger(info, 0);
 		dev_dbg(chip->dev, "Charger is reset\n");
 		break;
 	}
 	return IRQ_HANDLED;
 }

 static int start_measure(struct max8925_power_info *info, int type)
 {
 	unsigned char buf[2] = {0, 0};
 	int meas_cmd;
 	int meas_reg = 0, ret;

 	switch (type) {
 	case MEASURE_VCHG:
 		meas_cmd = MAX8925_CMD_VCHG;
 		meas_reg = MAX8925_ADC_VCHG;
 		break;
 	case MEASURE_VBBATT:
 		meas_cmd = MAX8925_CMD_VBBATT;
 		meas_reg = MAX8925_ADC_VBBATT;
 		break;
 	case MEASURE_VMBATT:
 		meas_cmd = MAX8925_CMD_VMBATT;
 		meas_reg = MAX8925_ADC_VMBATT;
 		break;
 	case MEASURE_ISNS:
 		meas_cmd = MAX8925_CMD_ISNS;
 		meas_reg = MAX8925_ADC_ISNS;
 		break;
 	default:
 		return -EINVAL;
 	}

 	max8925_reg_write(info->adc, meas_cmd, 0);
 	max8925_bulk_read(info->adc, meas_reg, 2, buf);
 	ret = ((buf[0]<<8) | buf[1]) >> 4;

 	return ret;
 }

 static int max8925_ac_get_prop(struct power_supply *psy,
 			       enum power_supply_property psp,
 			       union power_supply_propval *val)
 {
 	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 	int ret = 0;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = info->ac_online;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		if (info->ac_online) {
 			ret = start_measure(info, MEASURE_VCHG);
 			if (ret >= 0) {
 				val->intval = ret * 2000;	/* unit is uV */
 				goto out;
 			}
 		}
 		ret = -ENODATA;
 		break;
 	default:
 		ret = -ENODEV;
 		break;
 	}
 out:
 	return ret;
 }

 static enum power_supply_property max8925_ac_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 };

 static int max8925_usb_get_prop(struct power_supply *psy,
 				enum power_supply_property psp,
 				union power_supply_propval *val)
 {
 	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 	int ret = 0;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = info->usb_online;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		if (info->usb_online) {
 			ret = start_measure(info, MEASURE_VCHG);
 			if (ret >= 0) {
 				val->intval = ret * 2000;	/* unit is uV */
 				goto out;
 			}
 		}
 		ret = -ENODATA;
 		break;
 	default:
 		ret = -ENODEV;
 		break;
 	}
 out:
 	return ret;
 }

 static enum power_supply_property max8925_usb_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 };

 static int max8925_bat_get_prop(struct power_supply *psy,
 				enum power_supply_property psp,
 				union power_supply_propval *val)
 {
 	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 	int ret = 0;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = info->bat_online;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		if (info->bat_online) {
 			ret = start_measure(info, MEASURE_VMBATT);
 			if (ret >= 0) {
 				val->intval = ret * 2000;	/* unit is uV */
 				ret = 0;
 				break;
 			}
 		}
 		ret = -ENODATA;
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
 		if (info->bat_online) {
 			ret = start_measure(info, MEASURE_ISNS);
 			if (ret >= 0) {
 				/* assume r_sns is 0.02 */
 				ret = ((ret * 6250) - 3125) /* uA */;
 				val->intval = 0;
 				if (ret > 0)
 					val->intval = ret; /* unit is mA */
 				ret = 0;
 				break;
 			}
 		}
 		ret = -ENODATA;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_TYPE:
 		if (!info->bat_online) {
 			ret = -ENODATA;
 			break;
 		}
 		ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 		ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
 		switch (ret) {
 		case 1:
 			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 			break;
 		case 0:
 		case 2:
 			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 			break;
 		case 3:
 			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 			break;
 		}
 		ret = 0;
 		break;
 	case POWER_SUPPLY_PROP_STATUS:
 		if (!info->bat_online) {
 			ret = -ENODATA;
 			break;
 		}
 		ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 		if (info->usb_online || info->ac_online) {
 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 			if (ret & MAX8925_CHG_STAT_EN_MASK)
 				val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		} else
 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 		ret = 0;
 		break;
 	default:
 		ret = -ENODEV;
 		break;
 	}
 	return ret;
 }

 static enum power_supply_property max8925_battery_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 	POWER_SUPPLY_PROP_CHARGE_TYPE,
 	POWER_SUPPLY_PROP_STATUS,
 };

 #define REQUEST_IRQ(_irq, _name)					\
 do {									\
 	ret = request_threaded_irq(chip->irq_base + _irq, NULL,		\
 				    max8925_charger_handler,		\
 				    IRQF_ONESHOT, _name, info);		\
 	if (ret)							\
 		dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",	\
 			_irq, ret);					\
 } while (0)

 static int max8925_init_charger(struct max8925_chip *chip,
 					  struct max8925_power_info *info)
 {
 	int ret;

 	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
 	if (!info->no_insert_detect) {
 		REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
 		REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
 	}
 	if (!info->no_temp_support) {
 		REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
 		REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
 	}
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");

 	info->usb_online = 0;
 	info->bat_online = 0;

 	/* check for power - can miss interrupt at boot time */
 	if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
 		info->ac_online = 1;
 	else
 		info->ac_online = 0;

 	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 	if (ret >= 0) {
 		/*
 		 * If battery detection is enabled, ID pin of battery is
 		 * connected to MBDET pin of MAX8925. It could be used to
 		 * detect battery presence.
 		 * Otherwise, we have to assume that battery is always on.
 		 */
 		if (info->batt_detect)
 			info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
 		else
 			info->bat_online = 1;
 		if (ret & MAX8925_CHG_AC_RANGE_MASK)
 			info->ac_online = 1;
 		else
 			info->ac_online = 0;
 	}
 	/* disable charge */
 	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 	/* set charging current in charge topoff mode */
 	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
 			 info->topoff_threshold << 5);
 	/* set charing current in fast charge mode */
 	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);

 	return 0;
 }

 static int max8925_deinit_charger(struct max8925_power_info *info)
 {
 	struct max8925_chip *chip = info->chip;
 	int irq;

 	irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
 	for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
 		free_irq(irq, info);

 	return 0;
 }

 #ifdef CONFIG_OF
 static struct max8925_power_pdata *
 max8925_power_dt_init(struct platform_device *pdev)
 {
 	struct device_node *nproot = pdev->dev.parent->of_node;
 	struct device_node *np;
 	int batt_detect;
 	int topoff_threshold;
 	int fast_charge;
 	int no_temp_support;
 	int no_insert_detect;
 	struct max8925_power_pdata *pdata;

 	if (!nproot)
 		return pdev->dev.platform_data;

 	np = of_find_node_by_name(nproot, "charger");
 	if (!np) {
 		dev_err(&pdev->dev, "failed to find charger node\n");
 		return NULL;
 	}

 	pdata = devm_kzalloc(&pdev->dev,
 			sizeof(struct max8925_power_pdata),
 			GFP_KERNEL);

 	of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
 	of_property_read_u32(np, "batt-detect", &batt_detect);
 	of_property_read_u32(np, "fast-charge", &fast_charge);
 	of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
 	of_property_read_u32(np, "no-temp-support", &no_temp_support);

 	pdata->batt_detect = batt_detect;
 	pdata->fast_charge = fast_charge;
 	pdata->topoff_threshold = topoff_threshold;
 	pdata->no_insert_detect = no_insert_detect;
 	pdata->no_temp_support = no_temp_support;

 	return pdata;
 }
 #else
 static struct max8925_power_pdata *
 max8925_power_dt_init(struct platform_device *pdev)
 {
 	return pdev->dev.platform_data;
 }
 #endif

 static int max8925_power_probe(struct platform_device *pdev)
 {
 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 	struct max8925_power_pdata *pdata = NULL;
 	struct max8925_power_info *info;
 	int ret;

 	pdata = max8925_power_dt_init(pdev);
 	if (!pdata) {
 		dev_err(&pdev->dev, "platform data isn't assigned to "
 			"power supply\n");
 		return -EINVAL;
 	}

 	info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 	info->chip = chip;
 	info->gpm = chip->i2c;
 	info->adc = chip->adc;
 	platform_set_drvdata(pdev, info);

 	info->ac.name = "max8925-ac";
 	info->ac.type = POWER_SUPPLY_TYPE_MAINS;
 	info->ac.properties = max8925_ac_props;
 	info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
 	info->ac.get_property = max8925_ac_get_prop;
 	info->ac.supplied_to = pdata->supplied_to;
 	info->ac.num_supplicants = pdata->num_supplicants;
 	ret = power_supply_register(&pdev->dev, &info->ac);
 	if (ret)
 		goto out;
 	info->ac.dev->parent = &pdev->dev;

 	info->usb.name = "max8925-usb";
 	info->usb.type = POWER_SUPPLY_TYPE_USB;
 	info->usb.properties = max8925_usb_props;
 	info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
 	info->usb.get_property = max8925_usb_get_prop;
 	info->usb.supplied_to = pdata->supplied_to;
 	info->usb.num_supplicants = pdata->num_supplicants;

 	ret = power_supply_register(&pdev->dev, &info->usb);
 	if (ret)
 		goto out_usb;
 	info->usb.dev->parent = &pdev->dev;

 	info->battery.name = "max8925-battery";
 	info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 	info->battery.properties = max8925_battery_props;
 	info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
 	info->battery.get_property = max8925_bat_get_prop;
 	ret = power_supply_register(&pdev->dev, &info->battery);
 	if (ret)
 		goto out_battery;
 	info->battery.dev->parent = &pdev->dev;

 	info->batt_detect = pdata->batt_detect;
 	info->topoff_threshold = pdata->topoff_threshold;
 	info->fast_charge = pdata->fast_charge;
 	info->set_charger = pdata->set_charger;
 	info->no_temp_support = pdata->no_temp_support;
 	info->no_insert_detect = pdata->no_insert_detect;

 	max8925_init_charger(chip, info);
 	return 0;
 out_battery:
 	power_supply_unregister(&info->battery);
 out_usb:
 	power_supply_unregister(&info->ac);
 out:
 	kfree(info);
 	return ret;
 }

 static int max8925_power_remove(struct platform_device *pdev)
 {
 	struct max8925_power_info *info = platform_get_drvdata(pdev);

 	if (info) {
 		power_supply_unregister(&info->ac);
 		power_supply_unregister(&info->usb);
 		power_supply_unregister(&info->battery);
 		max8925_deinit_charger(info);
 		kfree(info);
 	}
 	return 0;
 }

 static struct platform_driver max8925_power_driver = {
 	.probe	= max8925_power_probe,
 	.remove	= max8925_power_remove,
 	.driver	= {
 		.name	= "max8925-power",
 	},
 };

 module_platform_driver(max8925_power_driver);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Power supply driver for MAX8925");
 MODULE_ALIAS("platform:max8925-power");
	/*
	* Battery driver for Maxim MAX8925
	*
	* Copyright (c) 2009-2010 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.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/err.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/mfd/max8925.h>

	/* registers in GPM */
	#define MAX8925_OUT5VEN 0x54
	#define MAX8925_OUT3VEN 0x58
	#define MAX8925_CHG_CNTL1 0x7c

	/* bits definition */
	#define MAX8925_CHG_STAT_VSYSLOW (1 << 0)
	#define MAX8925_CHG_STAT_MODE_MASK (3 << 2)
	#define MAX8925_CHG_STAT_EN_MASK (1 << 4)
	#define MAX8925_CHG_MBDET (1 << 1)
	#define MAX8925_CHG_AC_RANGE_MASK (3 << 6)

	/* registers in ADC */
	#define MAX8925_ADC_RES_CNFG1 0x06
	#define MAX8925_ADC_AVG_CNFG1 0x07
	#define MAX8925_ADC_ACQ_CNFG1 0x08
	#define MAX8925_ADC_ACQ_CNFG2 0x09
	/* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
	#define MAX8925_ADC_AUX2 0x62
	#define MAX8925_ADC_VCHG 0x64
	#define MAX8925_ADC_VBBATT 0x66
	#define MAX8925_ADC_VMBATT 0x68
	#define MAX8925_ADC_ISNS 0x6a
	#define MAX8925_ADC_THM 0x6c
	#define MAX8925_ADC_TDIE 0x6e
	#define MAX8925_CMD_AUX2 0xc8
	#define MAX8925_CMD_VCHG 0xd0
	#define MAX8925_CMD_VBBATT 0xd8
	#define MAX8925_CMD_VMBATT 0xe0
	#define MAX8925_CMD_ISNS 0xe8
	#define MAX8925_CMD_THM 0xf0
	#define MAX8925_CMD_TDIE 0xf8

	enum {
	MEASURE_AUX2,
	MEASURE_VCHG,
	MEASURE_VBBATT,
	MEASURE_VMBATT,
	MEASURE_ISNS,
	MEASURE_THM,
	MEASURE_TDIE,
	MEASURE_MAX,
	};

	struct max8925_power_info {
	struct max8925_chip *chip;
	struct i2c_client *gpm;
	struct i2c_client *adc;

	struct power_supply ac;
	struct power_supply usb;
	struct power_supply battery;
	int irq_base;
	unsigned ac_online:1;
	unsigned usb_online:1;
	unsigned bat_online:1;
	unsigned chg_mode:2;
	unsigned batt_detect:1; /* detecing MB by ID pin */
	unsigned topoff_threshold:2;
	unsigned fast_charge:3;
	unsigned no_temp_support:1;
	unsigned no_insert_detect:1;

	int (*set_charger) (int);
	};

	static int __set_charger(struct max8925_power_info *info, int enable)
	{
	struct max8925_chip *chip = info->chip;
	if (enable) {
	/* enable charger in platform */
	if (info->set_charger)
	info->set_charger(1);
	/* enable charger */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
	} else {
	/* disable charge */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
	if (info->set_charger)
	info->set_charger(0);
	}
	dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
	: "Disable charger");
	return 0;
	}

	static irqreturn_t max8925_charger_handler(int irq, void *data)
	{
	struct max8925_power_info info = (struct max8925_power_info )data;
	struct max8925_chip *chip = info->chip;

	switch (irq - chip->irq_base) {
	case MAX8925_IRQ_VCHG_DC_R:
	info->ac_online = 1;
	__set_charger(info, 1);
	dev_dbg(chip->dev, "Adapter inserted\n");
	break;
	case MAX8925_IRQ_VCHG_DC_F:
	info->ac_online = 0;
	__set_charger(info, 0);
	dev_dbg(chip->dev, "Adapter removed\n");
	break;
	case MAX8925_IRQ_VCHG_THM_OK_F:
	/* Battery is not ready yet */
	dev_dbg(chip->dev, "Battery temperature is out of range\n");
	case MAX8925_IRQ_VCHG_DC_OVP:
	dev_dbg(chip->dev, "Error detection\n");
	__set_charger(info, 0);
	break;
	case MAX8925_IRQ_VCHG_THM_OK_R:
	/* Battery is ready now */
	dev_dbg(chip->dev, "Battery temperature is in range\n");
	break;
	case MAX8925_IRQ_VCHG_SYSLOW_R:
	/* VSYS is low */
	dev_info(chip->dev, "Sys power is too low\n");
	break;
	case MAX8925_IRQ_VCHG_SYSLOW_F:
	dev_dbg(chip->dev, "Sys power is above low threshold\n");
	break;
	case MAX8925_IRQ_VCHG_DONE:
	__set_charger(info, 0);
	dev_dbg(chip->dev, "Charging is done\n");
	break;
	case MAX8925_IRQ_VCHG_TOPOFF:
	dev_dbg(chip->dev, "Charging in top-off mode\n");
	break;
	case MAX8925_IRQ_VCHG_TMR_FAULT:
	__set_charger(info, 0);
	dev_dbg(chip->dev, "Safe timer is expired\n");
	break;
	case MAX8925_IRQ_VCHG_RST:
	__set_charger(info, 0);
	dev_dbg(chip->dev, "Charger is reset\n");
	break;
	}
	return IRQ_HANDLED;
	}

	static int start_measure(struct max8925_power_info *info, int type)
	{
	unsigned char buf[2] = {0, 0};
	int meas_cmd;
	int meas_reg = 0, ret;

	switch (type) {
	case MEASURE_VCHG:
	meas_cmd = MAX8925_CMD_VCHG;
	meas_reg = MAX8925_ADC_VCHG;
	break;
	case MEASURE_VBBATT:
	meas_cmd = MAX8925_CMD_VBBATT;
	meas_reg = MAX8925_ADC_VBBATT;
	break;
	case MEASURE_VMBATT:
	meas_cmd = MAX8925_CMD_VMBATT;
	meas_reg = MAX8925_ADC_VMBATT;
	break;
	case MEASURE_ISNS:
	meas_cmd = MAX8925_CMD_ISNS;
	meas_reg = MAX8925_ADC_ISNS;
	break;
	default:
	return -EINVAL;
	}

	max8925_reg_write(info->adc, meas_cmd, 0);
	max8925_bulk_read(info->adc, meas_reg, 2, buf);
	ret = ((buf[0]<<8) \| buf[1]) >> 4;

	return ret;
	}

	static int max8925_ac_get_prop(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = info->ac_online;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	if (info->ac_online) {
	ret = start_measure(info, MEASURE_VCHG);
	if (ret >= 0) {
	val->intval = ret * 2000; /* unit is uV */
	goto out;
	}
	}
	ret = -ENODATA;
	break;
	default:
	ret = -ENODEV;
	break;
	}
	out:
	return ret;
	}

	static enum power_supply_property max8925_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	};

	static int max8925_usb_get_prop(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = info->usb_online;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	if (info->usb_online) {
	ret = start_measure(info, MEASURE_VCHG);
	if (ret >= 0) {
	val->intval = ret * 2000; /* unit is uV */
	goto out;
	}
	}
	ret = -ENODATA;
	break;
	default:
	ret = -ENODEV;
	break;
	}
	out:
	return ret;
	}

	static enum power_supply_property max8925_usb_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	};

	static int max8925_bat_get_prop(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = info->bat_online;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	if (info->bat_online) {
	ret = start_measure(info, MEASURE_VMBATT);
	if (ret >= 0) {
	val->intval = ret * 2000; /* unit is uV */
	ret = 0;
	break;
	}
	}
	ret = -ENODATA;
	break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	if (info->bat_online) {
	ret = start_measure(info, MEASURE_ISNS);
	if (ret >= 0) {
	/* assume r_sns is 0.02 */
	ret = ((ret * 6250) - 3125) /* uA */;
	val->intval = 0;
	if (ret > 0)
	val->intval = ret; /* unit is mA */
	ret = 0;
	break;
	}
	}
	ret = -ENODATA;
	break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
	if (!info->bat_online) {
	ret = -ENODATA;
	break;
	}
	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
	ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
	switch (ret) {
	case 1:
	val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
	break;
	case 0:
	case 2:
	val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
	break;
	case 3:
	val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
	break;
	}
	ret = 0;
	break;
	case POWER_SUPPLY_PROP_STATUS:
	if (!info->bat_online) {
	ret = -ENODATA;
	break;
	}
	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
	if (info->usb_online \|\| info->ac_online) {
	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	if (ret & MAX8925_CHG_STAT_EN_MASK)
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	} else
	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	ret = 0;
	break;
	default:
	ret = -ENODEV;
	break;
	}
	return ret;
	}

	static enum power_supply_property max8925_battery_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_STATUS,
	};

	#define REQUEST_IRQ(_irq, _name) \
	do { \
	ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
	max8925_charger_handler, \
	IRQF_ONESHOT, _name, info); \
	if (ret) \
	dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
	_irq, ret); \
	} while (0)

	static int max8925_init_charger(struct max8925_chip *chip,
	struct max8925_power_info *info)
	{
	int ret;

	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
	if (!info->no_insert_detect) {
	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
	}
	if (!info->no_temp_support) {
	REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
	}
	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");

	info->usb_online = 0;
	info->bat_online = 0;

	/* check for power - can miss interrupt at boot time */
	if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
	info->ac_online = 1;
	else
	info->ac_online = 0;

	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
	if (ret >= 0) {
	/*
	* If battery detection is enabled, ID pin of battery is
	* connected to MBDET pin of MAX8925. It could be used to
	* detect battery presence.
	* Otherwise, we have to assume that battery is always on.
	*/
	if (info->batt_detect)
	info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
	else
	info->bat_online = 1;
	if (ret & MAX8925_CHG_AC_RANGE_MASK)
	info->ac_online = 1;
	else
	info->ac_online = 0;
	}
	/* disable charge */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
	/* set charging current in charge topoff mode */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
	info->topoff_threshold << 5);
	/* set charing current in fast charge mode */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);

	return 0;
	}

	static int max8925_deinit_charger(struct max8925_power_info *info)
	{
	struct max8925_chip *chip = info->chip;
	int irq;

	irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
	for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
	free_irq(irq, info);

	return 0;
	}

	#ifdef CONFIG_OF
	static struct max8925_power_pdata *
	max8925_power_dt_init(struct platform_device *pdev)
	{
	struct device_node *nproot = pdev->dev.parent->of_node;
	struct device_node *np;
	int batt_detect;
	int topoff_threshold;
	int fast_charge;
	int no_temp_support;
	int no_insert_detect;
	struct max8925_power_pdata *pdata;

	if (!nproot)
	return pdev->dev.platform_data;

	np = of_find_node_by_name(nproot, "charger");
	if (!np) {
	dev_err(&pdev->dev, "failed to find charger node\n");
	return NULL;
	}

	pdata = devm_kzalloc(&pdev->dev,
	sizeof(struct max8925_power_pdata),
	GFP_KERNEL);

	of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
	of_property_read_u32(np, "batt-detect", &batt_detect);
	of_property_read_u32(np, "fast-charge", &fast_charge);
	of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
	of_property_read_u32(np, "no-temp-support", &no_temp_support);

	pdata->batt_detect = batt_detect;
	pdata->fast_charge = fast_charge;
	pdata->topoff_threshold = topoff_threshold;
	pdata->no_insert_detect = no_insert_detect;
	pdata->no_temp_support = no_temp_support;

	return pdata;
	}
	#else
	static struct max8925_power_pdata *
	max8925_power_dt_init(struct platform_device *pdev)
	{
	return pdev->dev.platform_data;
	}
	#endif

	static int max8925_power_probe(struct platform_device *pdev)
	{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_power_pdata *pdata = NULL;
	struct max8925_power_info *info;
	int ret;

	pdata = max8925_power_dt_init(pdev);
	if (!pdata) {
	dev_err(&pdev->dev, "platform data isn't assigned to "
	"power supply\n");
	return -EINVAL;
	}

	info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
	if (!info)
	return -ENOMEM;
	info->chip = chip;
	info->gpm = chip->i2c;
	info->adc = chip->adc;
	platform_set_drvdata(pdev, info);

	info->ac.name = "max8925-ac";
	info->ac.type = POWER_SUPPLY_TYPE_MAINS;
	info->ac.properties = max8925_ac_props;
	info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
	info->ac.get_property = max8925_ac_get_prop;
	info->ac.supplied_to = pdata->supplied_to;
	info->ac.num_supplicants = pdata->num_supplicants;
	ret = power_supply_register(&pdev->dev, &info->ac);
	if (ret)
	goto out;
	info->ac.dev->parent = &pdev->dev;

	info->usb.name = "max8925-usb";
	info->usb.type = POWER_SUPPLY_TYPE_USB;
	info->usb.properties = max8925_usb_props;
	info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
	info->usb.get_property = max8925_usb_get_prop;
	info->usb.supplied_to = pdata->supplied_to;
	info->usb.num_supplicants = pdata->num_supplicants;

	ret = power_supply_register(&pdev->dev, &info->usb);
	if (ret)
	goto out_usb;
	info->usb.dev->parent = &pdev->dev;

	info->battery.name = "max8925-battery";
	info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	info->battery.properties = max8925_battery_props;
	info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
	info->battery.get_property = max8925_bat_get_prop;
	ret = power_supply_register(&pdev->dev, &info->battery);
	if (ret)
	goto out_battery;
	info->battery.dev->parent = &pdev->dev;

	info->batt_detect = pdata->batt_detect;
	info->topoff_threshold = pdata->topoff_threshold;
	info->fast_charge = pdata->fast_charge;
	info->set_charger = pdata->set_charger;
	info->no_temp_support = pdata->no_temp_support;
	info->no_insert_detect = pdata->no_insert_detect;

	max8925_init_charger(chip, info);
	return 0;
	out_battery:
	power_supply_unregister(&info->battery);
	out_usb:
	power_supply_unregister(&info->ac);
	out:
	kfree(info);
	return ret;
	}

	static int max8925_power_remove(struct platform_device *pdev)
	{
	struct max8925_power_info *info = platform_get_drvdata(pdev);

	if (info) {
	power_supply_unregister(&info->ac);
	power_supply_unregister(&info->usb);
	power_supply_unregister(&info->battery);
	max8925_deinit_charger(info);
	kfree(info);
	}
	return 0;
	}

	static struct platform_driver max8925_power_driver = {
	.probe = max8925_power_probe,
	.remove = max8925_power_remove,
	.driver = {
	.name = "max8925-power",
	},
	};

	module_platform_driver(max8925_power_driver);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Power supply driver for MAX8925");
	MODULE_ALIAS("platform:max8925-power");