drivers/power/supply/pcf50633-charger.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /* NXP PCF50633 Main Battery Charger Driver
  *
  * (C) 2006-2008 by Openmoko, Inc.
  * Author: Balaji Rao <balajirrao@openmoko.org>
  * All rights reserved.
  *
  * Broken down from monstrous PCF50633 driver mainly by
  * Harald Welte, Andy Green and Werner Almesberger
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>

 #include <linux/mfd/pcf50633/core.h>
 #include <linux/mfd/pcf50633/mbc.h>

 struct pcf50633_mbc {
 	struct pcf50633 *pcf;

 	int adapter_online;
 	int usb_online;

 	struct power_supply *usb;
 	struct power_supply *adapter;
 	struct power_supply *ac;
 };

 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
 {
 	struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
 	int ret = 0;
 	u8 bits;
 	u8 mbcs2, chgmod;
 	unsigned int mbcc5;

 	if (ma >= 1000) {
 		bits = PCF50633_MBCC7_USB_1000mA;
 		ma = 1000;
 	} else if (ma >= 500) {
 		bits = PCF50633_MBCC7_USB_500mA;
 		ma = 500;
 	} else if (ma >= 100) {
 		bits = PCF50633_MBCC7_USB_100mA;
 		ma = 100;
 	} else {
 		bits = PCF50633_MBCC7_USB_SUSPEND;
 		ma = 0;
 	}

 	ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
 					PCF50633_MBCC7_USB_MASK, bits);
 	if (ret)
 		dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
 	else
 		dev_info(pcf->dev, "usb curlim to %d mA\n", ma);

 	/*
 	 * We limit the charging current to be the USB current limit.
 	 * The reason is that on pcf50633, when it enters PMU Standby mode,
 	 * which it does when the device goes "off", the USB current limit
 	 * reverts to the variant default.  In at least one common case, that
 	 * default is 500mA.  By setting the charging current to be the same
 	 * as the USB limit we set here before PMU standby, we enforce it only
 	 * using the correct amount of current even when the USB current limit
 	 * gets reset to the wrong thing
 	 */

 	if (mbc->pcf->pdata->charger_reference_current_ma) {
 		mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
 		if (mbcc5 > 255)
 			mbcc5 = 255;
 		pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
 	}

 	mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
 	chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);

 	/* If chgmod == BATFULL, setting chgena has no effect.
 	 * Datasheet says we need to set resume instead but when autoresume is
 	 * used resume doesn't work. Clear and set chgena instead.
 	 */
 	if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
 		pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
 				PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
 	else {
 		pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
 				PCF50633_MBCC1_CHGENA);
 		pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
 				PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
 	}

 	power_supply_changed(mbc->usb);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);

 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
 {
 	struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
 	int status = 0;
 	u8 chgmod;

 	if (!mbc)
 		return 0;

 	chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
 		& PCF50633_MBCS2_MBC_MASK;

 	if (mbc->usb_online)
 		status |= PCF50633_MBC_USB_ONLINE;
 	if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
 	    chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
 	    chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
 	    chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
 		status |= PCF50633_MBC_USB_ACTIVE;
 	if (mbc->adapter_online)
 		status |= PCF50633_MBC_ADAPTER_ONLINE;
 	if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
 	    chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
 	    chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
 	    chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
 		status |= PCF50633_MBC_ADAPTER_ACTIVE;

 	return status;
 }
 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);

 int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
 {
 	struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);

 	if (!mbc)
 		return 0;

 	return mbc->usb_online;
 }
 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);

 static ssize_t
 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);

 	u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
 	u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);

 	return sysfs_emit(buf, "%d\n", chgmod);
 }
 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);

 static ssize_t
 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 	u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 						PCF50633_MBCC7_USB_MASK;
 	unsigned int ma;

 	if (usblim == PCF50633_MBCC7_USB_1000mA)
 		ma = 1000;
 	else if (usblim == PCF50633_MBCC7_USB_500mA)
 		ma = 500;
 	else if (usblim == PCF50633_MBCC7_USB_100mA)
 		ma = 100;
 	else
 		ma = 0;

 	return sysfs_emit(buf, "%u\n", ma);
 }

 static ssize_t set_usblim(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 	unsigned long ma;
 	int ret;

 	ret = kstrtoul(buf, 10, &ma);
 	if (ret)
 		return ret;

 	pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);

 	return count;
 }

 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);

 static ssize_t
 show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 	u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
 	unsigned int ma;

 	if (!mbc->pcf->pdata->charger_reference_current_ma)
 		return -ENODEV;

 	ma = (mbc->pcf->pdata->charger_reference_current_ma *  mbcc5) >> 8;

 	return sysfs_emit(buf, "%u\n", ma);
 }

 static ssize_t set_chglim(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 	unsigned long ma;
 	unsigned int mbcc5;
 	int ret;

 	if (!mbc->pcf->pdata->charger_reference_current_ma)
 		return -ENODEV;

 	ret = kstrtoul(buf, 10, &ma);
 	if (ret)
 		return ret;

 	mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
 	if (mbcc5 > 255)
 		mbcc5 = 255;
 	pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);

 	return count;
 }

 /*
  * This attribute allows to change MBC charging limit on the fly
  * independently of usb current limit. It also gets set automatically every
  * time usb current limit is changed.
  */
 static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);

 static struct attribute *pcf50633_mbc_sysfs_attrs[] = {
 	&dev_attr_chgmode.attr,
 	&dev_attr_usb_curlim.attr,
 	&dev_attr_chg_curlim.attr,
 	NULL,
 };

 ATTRIBUTE_GROUPS(pcf50633_mbc_sysfs);

 static void
 pcf50633_mbc_irq_handler(int irq, void *data)
 {
 	struct pcf50633_mbc *mbc = data;

 	/* USB */
 	if (irq == PCF50633_IRQ_USBINS) {
 		mbc->usb_online = 1;
 	} else if (irq == PCF50633_IRQ_USBREM) {
 		mbc->usb_online = 0;
 		pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
 	}

 	/* Adapter */
 	if (irq == PCF50633_IRQ_ADPINS)
 		mbc->adapter_online = 1;
 	else if (irq == PCF50633_IRQ_ADPREM)
 		mbc->adapter_online = 0;

 	power_supply_changed(mbc->ac);
 	power_supply_changed(mbc->usb);
 	power_supply_changed(mbc->adapter);

 	if (mbc->pcf->pdata->mbc_event_callback)
 		mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
 }

 static int adapter_get_property(struct power_supply *psy,
 			enum power_supply_property psp,
 			union power_supply_propval *val)
 {
 	struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 	int ret = 0;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval =  mbc->adapter_online;
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static int usb_get_property(struct power_supply *psy,
 			enum power_supply_property psp,
 			union power_supply_propval *val)
 {
 	struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 	int ret = 0;
 	u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 						PCF50633_MBCC7_USB_MASK;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = mbc->usb_online &&
 				(usblim <= PCF50633_MBCC7_USB_500mA);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static int ac_get_property(struct power_supply *psy,
 			enum power_supply_property psp,
 			union power_supply_propval *val)
 {
 	struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 	int ret = 0;
 	u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 						PCF50633_MBCC7_USB_MASK;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = mbc->usb_online &&
 				(usblim == PCF50633_MBCC7_USB_1000mA);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static enum power_supply_property power_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 };

 static const u8 mbc_irq_handlers[] = {
 	PCF50633_IRQ_ADPINS,
 	PCF50633_IRQ_ADPREM,
 	PCF50633_IRQ_USBINS,
 	PCF50633_IRQ_USBREM,
 	PCF50633_IRQ_BATFULL,
 	PCF50633_IRQ_CHGHALT,
 	PCF50633_IRQ_THLIMON,
 	PCF50633_IRQ_THLIMOFF,
 	PCF50633_IRQ_USBLIMON,
 	PCF50633_IRQ_USBLIMOFF,
 	PCF50633_IRQ_LOWSYS,
 	PCF50633_IRQ_LOWBAT,
 };

 static const struct power_supply_desc pcf50633_mbc_adapter_desc = {
 	.name		= "adapter",
 	.type		= POWER_SUPPLY_TYPE_MAINS,
 	.properties	= power_props,
 	.num_properties	= ARRAY_SIZE(power_props),
 	.get_property	= &adapter_get_property,
 };

 static const struct power_supply_desc pcf50633_mbc_usb_desc = {
 	.name		= "usb",
 	.type		= POWER_SUPPLY_TYPE_USB,
 	.properties	= power_props,
 	.num_properties	= ARRAY_SIZE(power_props),
 	.get_property	= usb_get_property,
 };

 static const struct power_supply_desc pcf50633_mbc_ac_desc = {
 	.name		= "ac",
 	.type		= POWER_SUPPLY_TYPE_MAINS,
 	.properties	= power_props,
 	.num_properties	= ARRAY_SIZE(power_props),
 	.get_property	= ac_get_property,
 };

 static int pcf50633_mbc_probe(struct platform_device *pdev)
 {
 	struct power_supply_config psy_cfg = {};
 	struct power_supply_config usb_psy_cfg;
 	struct pcf50633_mbc *mbc;
 	int i;
 	u8 mbcs1;

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

 	platform_set_drvdata(pdev, mbc);
 	mbc->pcf = dev_to_pcf50633(pdev->dev.parent);

 	/* Set up IRQ handlers */
 	for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 		pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
 					pcf50633_mbc_irq_handler, mbc);

 	psy_cfg.supplied_to		= mbc->pcf->pdata->batteries;
 	psy_cfg.num_supplicants		= mbc->pcf->pdata->num_batteries;
 	psy_cfg.drv_data		= mbc;

 	/* Create power supplies */
 	mbc->adapter = power_supply_register(&pdev->dev,
 					     &pcf50633_mbc_adapter_desc,
 					     &psy_cfg);
 	if (IS_ERR(mbc->adapter)) {
 		dev_err(mbc->pcf->dev, "failed to register adapter\n");
 		return PTR_ERR(mbc->adapter);
 	}

 	usb_psy_cfg = psy_cfg;
 	usb_psy_cfg.attr_grp = pcf50633_mbc_sysfs_groups;

 	mbc->usb = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
 					 &usb_psy_cfg);
 	if (IS_ERR(mbc->usb)) {
 		dev_err(mbc->pcf->dev, "failed to register usb\n");
 		power_supply_unregister(mbc->adapter);
 		return PTR_ERR(mbc->usb);
 	}

 	mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
 					&psy_cfg);
 	if (IS_ERR(mbc->ac)) {
 		dev_err(mbc->pcf->dev, "failed to register ac\n");
 		power_supply_unregister(mbc->adapter);
 		power_supply_unregister(mbc->usb);
 		return PTR_ERR(mbc->ac);
 	}

 	mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
 	if (mbcs1 & PCF50633_MBCS1_USBPRES)
 		pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
 	if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
 		pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);

 	return 0;
 }

 static void pcf50633_mbc_remove(struct platform_device *pdev)
 {
 	struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
 	int i;

 	/* Remove IRQ handlers */
 	for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 		pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);

 	power_supply_unregister(mbc->usb);
 	power_supply_unregister(mbc->adapter);
 	power_supply_unregister(mbc->ac);
 }

 static struct platform_driver pcf50633_mbc_driver = {
 	.driver = {
 		.name = "pcf50633-mbc",
 	},
 	.probe = pcf50633_mbc_probe,
 	.remove_new = pcf50633_mbc_remove,
 };

 module_platform_driver(pcf50633_mbc_driver);

 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 MODULE_DESCRIPTION("PCF50633 mbc driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:pcf50633-mbc");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/* NXP PCF50633 Main Battery Charger Driver
	*
	* (C) 2006-2008 by Openmoko, Inc.
	* Author: Balaji Rao <balajirrao@openmoko.org>
	* All rights reserved.
	*
	* Broken down from monstrous PCF50633 driver mainly by
	* Harald Welte, Andy Green and Werner Almesberger
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/device.h>
	#include <linux/sysfs.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>

	#include <linux/mfd/pcf50633/core.h>
	#include <linux/mfd/pcf50633/mbc.h>

	struct pcf50633_mbc {
	struct pcf50633 *pcf;

	int adapter_online;
	int usb_online;

	struct power_supply *usb;
	struct power_supply *adapter;
	struct power_supply *ac;
	};

	int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
	{
	struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
	int ret = 0;
	u8 bits;
	u8 mbcs2, chgmod;
	unsigned int mbcc5;

	if (ma >= 1000) {
	bits = PCF50633_MBCC7_USB_1000mA;
	ma = 1000;
	} else if (ma >= 500) {
	bits = PCF50633_MBCC7_USB_500mA;
	ma = 500;
	} else if (ma >= 100) {
	bits = PCF50633_MBCC7_USB_100mA;
	ma = 100;
	} else {
	bits = PCF50633_MBCC7_USB_SUSPEND;
	ma = 0;
	}

	ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
	PCF50633_MBCC7_USB_MASK, bits);
	if (ret)
	dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
	else
	dev_info(pcf->dev, "usb curlim to %d mA\n", ma);

	/*
	* We limit the charging current to be the USB current limit.
	* The reason is that on pcf50633, when it enters PMU Standby mode,
	* which it does when the device goes "off", the USB current limit
	* reverts to the variant default. In at least one common case, that
	* default is 500mA. By setting the charging current to be the same
	* as the USB limit we set here before PMU standby, we enforce it only
	* using the correct amount of current even when the USB current limit
	* gets reset to the wrong thing
	*/

	if (mbc->pcf->pdata->charger_reference_current_ma) {
	mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
	if (mbcc5 > 255)
	mbcc5 = 255;
	pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
	}

	mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
	chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);

	/* If chgmod == BATFULL, setting chgena has no effect.
	* Datasheet says we need to set resume instead but when autoresume is
	* used resume doesn't work. Clear and set chgena instead.
	*/
	if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
	pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
	PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
	else {
	pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
	PCF50633_MBCC1_CHGENA);
	pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
	PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
	}

	power_supply_changed(mbc->usb);

	return ret;
	}
	EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);

	int pcf50633_mbc_get_status(struct pcf50633 *pcf)
	{
	struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
	int status = 0;
	u8 chgmod;

	if (!mbc)
	return 0;

	chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
	& PCF50633_MBCS2_MBC_MASK;

	if (mbc->usb_online)
	status \|= PCF50633_MBC_USB_ONLINE;
	if (chgmod == PCF50633_MBCS2_MBC_USB_PRE \|\|
	chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT \|\|
	chgmod == PCF50633_MBCS2_MBC_USB_FAST \|\|
	chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
	status \|= PCF50633_MBC_USB_ACTIVE;
	if (mbc->adapter_online)
	status \|= PCF50633_MBC_ADAPTER_ONLINE;
	if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE \|\|
	chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT \|\|
	chgmod == PCF50633_MBCS2_MBC_ADP_FAST \|\|
	chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
	status \|= PCF50633_MBC_ADAPTER_ACTIVE;

	return status;
	}
	EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);

	int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
	{
	struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);

	if (!mbc)
	return 0;

	return mbc->usb_online;
	}
	EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);

	static ssize_t
	show_chgmode(struct device dev, struct device_attribute attr, char *buf)
	{
	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);

	u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
	u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);

	return sysfs_emit(buf, "%d\n", chgmod);
	}
	static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);

	static ssize_t
	show_usblim(struct device dev, struct device_attribute attr, char *buf)
	{
	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
	u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
	PCF50633_MBCC7_USB_MASK;
	unsigned int ma;

	if (usblim == PCF50633_MBCC7_USB_1000mA)
	ma = 1000;
	else if (usblim == PCF50633_MBCC7_USB_500mA)
	ma = 500;
	else if (usblim == PCF50633_MBCC7_USB_100mA)
	ma = 100;
	else
	ma = 0;

	return sysfs_emit(buf, "%u\n", ma);
	}

	static ssize_t set_usblim(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
	unsigned long ma;
	int ret;

	ret = kstrtoul(buf, 10, &ma);
	if (ret)
	return ret;

	pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);

	return count;
	}

	static DEVICE_ATTR(usb_curlim, S_IRUGO \| S_IWUSR, show_usblim, set_usblim);

	static ssize_t
	show_chglim(struct device dev, struct device_attribute attr, char *buf)
	{
	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
	u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
	unsigned int ma;

	if (!mbc->pcf->pdata->charger_reference_current_ma)
	return -ENODEV;

	ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;

	return sysfs_emit(buf, "%u\n", ma);
	}

	static ssize_t set_chglim(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
	unsigned long ma;
	unsigned int mbcc5;
	int ret;

	if (!mbc->pcf->pdata->charger_reference_current_ma)
	return -ENODEV;

	ret = kstrtoul(buf, 10, &ma);
	if (ret)
	return ret;

	mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
	if (mbcc5 > 255)
	mbcc5 = 255;
	pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);

	return count;
	}

	/*
	* This attribute allows to change MBC charging limit on the fly
	* independently of usb current limit. It also gets set automatically every
	* time usb current limit is changed.
	*/
	static DEVICE_ATTR(chg_curlim, S_IRUGO \| S_IWUSR, show_chglim, set_chglim);

	static struct attribute *pcf50633_mbc_sysfs_attrs[] = {
	&dev_attr_chgmode.attr,
	&dev_attr_usb_curlim.attr,
	&dev_attr_chg_curlim.attr,
	NULL,
	};

	ATTRIBUTE_GROUPS(pcf50633_mbc_sysfs);

	static void
	pcf50633_mbc_irq_handler(int irq, void *data)
	{
	struct pcf50633_mbc *mbc = data;

	/* USB */
	if (irq == PCF50633_IRQ_USBINS) {
	mbc->usb_online = 1;
	} else if (irq == PCF50633_IRQ_USBREM) {
	mbc->usb_online = 0;
	pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
	}

	/* Adapter */
	if (irq == PCF50633_IRQ_ADPINS)
	mbc->adapter_online = 1;
	else if (irq == PCF50633_IRQ_ADPREM)
	mbc->adapter_online = 0;

	power_supply_changed(mbc->ac);
	power_supply_changed(mbc->usb);
	power_supply_changed(mbc->adapter);

	if (mbc->pcf->pdata->mbc_event_callback)
	mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
	}

	static int adapter_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = mbc->adapter_online;
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static int usb_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
	int ret = 0;
	u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
	PCF50633_MBCC7_USB_MASK;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = mbc->usb_online &&
	(usblim <= PCF50633_MBCC7_USB_500mA);
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static int ac_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
	int ret = 0;
	u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
	PCF50633_MBCC7_USB_MASK;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = mbc->usb_online &&
	(usblim == PCF50633_MBCC7_USB_1000mA);
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static enum power_supply_property power_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	};

	static const u8 mbc_irq_handlers[] = {
	PCF50633_IRQ_ADPINS,
	PCF50633_IRQ_ADPREM,
	PCF50633_IRQ_USBINS,
	PCF50633_IRQ_USBREM,
	PCF50633_IRQ_BATFULL,
	PCF50633_IRQ_CHGHALT,
	PCF50633_IRQ_THLIMON,
	PCF50633_IRQ_THLIMOFF,
	PCF50633_IRQ_USBLIMON,
	PCF50633_IRQ_USBLIMOFF,
	PCF50633_IRQ_LOWSYS,
	PCF50633_IRQ_LOWBAT,
	};

	static const struct power_supply_desc pcf50633_mbc_adapter_desc = {
	.name = "adapter",
	.type = POWER_SUPPLY_TYPE_MAINS,
	.properties = power_props,
	.num_properties = ARRAY_SIZE(power_props),
	.get_property = &adapter_get_property,
	};

	static const struct power_supply_desc pcf50633_mbc_usb_desc = {
	.name = "usb",
	.type = POWER_SUPPLY_TYPE_USB,
	.properties = power_props,
	.num_properties = ARRAY_SIZE(power_props),
	.get_property = usb_get_property,
	};

	static const struct power_supply_desc pcf50633_mbc_ac_desc = {
	.name = "ac",
	.type = POWER_SUPPLY_TYPE_MAINS,
	.properties = power_props,
	.num_properties = ARRAY_SIZE(power_props),
	.get_property = ac_get_property,
	};

	static int pcf50633_mbc_probe(struct platform_device *pdev)
	{
	struct power_supply_config psy_cfg = {};
	struct power_supply_config usb_psy_cfg;
	struct pcf50633_mbc *mbc;
	int i;
	u8 mbcs1;

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

	platform_set_drvdata(pdev, mbc);
	mbc->pcf = dev_to_pcf50633(pdev->dev.parent);

	/* Set up IRQ handlers */
	for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
	pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
	pcf50633_mbc_irq_handler, mbc);

	psy_cfg.supplied_to = mbc->pcf->pdata->batteries;
	psy_cfg.num_supplicants = mbc->pcf->pdata->num_batteries;
	psy_cfg.drv_data = mbc;

	/* Create power supplies */
	mbc->adapter = power_supply_register(&pdev->dev,
	&pcf50633_mbc_adapter_desc,
	&psy_cfg);
	if (IS_ERR(mbc->adapter)) {
	dev_err(mbc->pcf->dev, "failed to register adapter\n");
	return PTR_ERR(mbc->adapter);
	}

	usb_psy_cfg = psy_cfg;
	usb_psy_cfg.attr_grp = pcf50633_mbc_sysfs_groups;

	mbc->usb = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
	&usb_psy_cfg);
	if (IS_ERR(mbc->usb)) {
	dev_err(mbc->pcf->dev, "failed to register usb\n");
	power_supply_unregister(mbc->adapter);
	return PTR_ERR(mbc->usb);
	}

	mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
	&psy_cfg);
	if (IS_ERR(mbc->ac)) {
	dev_err(mbc->pcf->dev, "failed to register ac\n");
	power_supply_unregister(mbc->adapter);
	power_supply_unregister(mbc->usb);
	return PTR_ERR(mbc->ac);
	}

	mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
	if (mbcs1 & PCF50633_MBCS1_USBPRES)
	pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
	if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
	pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);

	return 0;
	}

	static void pcf50633_mbc_remove(struct platform_device *pdev)
	{
	struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
	int i;

	/* Remove IRQ handlers */
	for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
	pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);

	power_supply_unregister(mbc->usb);
	power_supply_unregister(mbc->adapter);
	power_supply_unregister(mbc->ac);
	}

	static struct platform_driver pcf50633_mbc_driver = {
	.driver = {
	.name = "pcf50633-mbc",
	},
	.probe = pcf50633_mbc_probe,
	.remove_new = pcf50633_mbc_remove,
	};

	module_platform_driver(pcf50633_mbc_driver);

	MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
	MODULE_DESCRIPTION("PCF50633 mbc driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:pcf50633-mbc");