drivers/power/supply/da9150-charger.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * DA9150 Charger Driver
  *
  * Copyright (c) 2014 Dialog Semiconductor
  *
  * Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/interrupt.h>
 #include <linux/power_supply.h>
 #include <linux/notifier.h>
 #include <linux/usb/phy.h>
 #include <linux/iio/consumer.h>
 #include <linux/mfd/da9150/core.h>
 #include <linux/mfd/da9150/registers.h>

 /* Private data */
 struct da9150_charger {
 	struct da9150 *da9150;
 	struct device *dev;

 	struct power_supply *usb;
 	struct power_supply *battery;
 	struct power_supply *supply_online;

 	struct usb_phy *usb_phy;
 	struct notifier_block otg_nb;
 	struct work_struct otg_work;
 	unsigned long usb_event;

 	struct iio_channel *ibus_chan;
 	struct iio_channel *vbus_chan;
 	struct iio_channel *tjunc_chan;
 	struct iio_channel *vbat_chan;
 };

 static inline int da9150_charger_supply_online(struct da9150_charger *charger,
 					       struct power_supply *psy,
 					       union power_supply_propval *val)
 {
 	val->intval = (psy == charger->supply_online) ? 1 : 0;

 	return 0;
 }

 /* Charger Properties */
 static int da9150_charger_vbus_voltage_now(struct da9150_charger *charger,
 					   union power_supply_propval *val)
 {
 	int v_val, ret;

 	/* Read processed value - mV units */
 	ret = iio_read_channel_processed(charger->vbus_chan, &v_val);
 	if (ret < 0)
 		return ret;

 	/* Convert voltage to expected uV units */
 	val->intval = v_val * 1000;

 	return 0;
 }

 static int da9150_charger_ibus_current_avg(struct da9150_charger *charger,
 					   union power_supply_propval *val)
 {
 	int i_val, ret;

 	/* Read processed value - mA units */
 	ret = iio_read_channel_processed(charger->ibus_chan, &i_val);
 	if (ret < 0)
 		return ret;

 	/* Convert current to expected uA units */
 	val->intval = i_val * 1000;

 	return 0;
 }

 static int da9150_charger_tjunc_temp(struct da9150_charger *charger,
 				     union power_supply_propval *val)
 {
 	int t_val, ret;

 	/* Read processed value - 0.001 degrees C units */
 	ret = iio_read_channel_processed(charger->tjunc_chan, &t_val);
 	if (ret < 0)
 		return ret;

 	/* Convert temp to expect 0.1 degrees C units */
 	val->intval = t_val / 100;

 	return 0;
 }

 static enum power_supply_property da9150_charger_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_AVG,
 	POWER_SUPPLY_PROP_TEMP,
 };

 static int da9150_charger_get_prop(struct power_supply *psy,
 				   enum power_supply_property psp,
 				   union power_supply_propval *val)
 {
 	struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent);
 	int ret;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		ret = da9150_charger_supply_online(charger, psy, val);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		ret = da9150_charger_vbus_voltage_now(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_AVG:
 		ret = da9150_charger_ibus_current_avg(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_TEMP:
 		ret = da9150_charger_tjunc_temp(charger, val);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 /* Battery Properties */
 static int da9150_charger_battery_status(struct da9150_charger *charger,
 					 union power_supply_propval *val)
 {
 	u8 reg;

 	/* Check to see if battery is discharging */
 	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_H);

 	if (((reg & DA9150_VBUS_STAT_MASK) == DA9150_VBUS_STAT_OFF) ||
 	    ((reg & DA9150_VBUS_STAT_MASK) == DA9150_VBUS_STAT_WAIT)) {
 		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;

 		return 0;
 	}

 	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);

 	/* Now check for other states */
 	switch (reg & DA9150_CHG_STAT_MASK) {
 	case DA9150_CHG_STAT_ACT:
 	case DA9150_CHG_STAT_PRE:
 	case DA9150_CHG_STAT_CC:
 	case DA9150_CHG_STAT_CV:
 		val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		break;
 	case DA9150_CHG_STAT_OFF:
 	case DA9150_CHG_STAT_SUSP:
 	case DA9150_CHG_STAT_TEMP:
 	case DA9150_CHG_STAT_TIME:
 	case DA9150_CHG_STAT_BAT:
 		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 		break;
 	case DA9150_CHG_STAT_FULL:
 		val->intval = POWER_SUPPLY_STATUS_FULL;
 		break;
 	default:
 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 		break;
 	}

 	return 0;
 }

 static int da9150_charger_battery_health(struct da9150_charger *charger,
 					 union power_supply_propval *val)
 {
 	u8 reg;

 	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);

 	/* Check if temperature limit reached */
 	switch (reg & DA9150_CHG_TEMP_MASK) {
 	case DA9150_CHG_TEMP_UNDER:
 		val->intval = POWER_SUPPLY_HEALTH_COLD;
 		return 0;
 	case DA9150_CHG_TEMP_OVER:
 		val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 		return 0;
 	default:
 		break;
 	}

 	/* Check for other health states */
 	switch (reg & DA9150_CHG_STAT_MASK) {
 	case DA9150_CHG_STAT_ACT:
 	case DA9150_CHG_STAT_PRE:
 		val->intval = POWER_SUPPLY_HEALTH_DEAD;
 		break;
 	case DA9150_CHG_STAT_TIME:
 		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 		break;
 	default:
 		val->intval = POWER_SUPPLY_HEALTH_GOOD;
 		break;
 	}

 	return 0;
 }

 static int da9150_charger_battery_present(struct da9150_charger *charger,
 					  union power_supply_propval *val)
 {
 	u8 reg;

 	/* Check if battery present or removed */
 	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);
 	if ((reg & DA9150_CHG_STAT_MASK) == DA9150_CHG_STAT_BAT)
 		val->intval = 0;
 	else
 		val->intval = 1;

 	return 0;
 }

 static int da9150_charger_battery_charge_type(struct da9150_charger *charger,
 					      union power_supply_propval *val)
 {
 	u8 reg;

 	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);

 	switch (reg & DA9150_CHG_STAT_MASK) {
 	case DA9150_CHG_STAT_CC:
 		val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 		break;
 	case DA9150_CHG_STAT_ACT:
 	case DA9150_CHG_STAT_PRE:
 	case DA9150_CHG_STAT_CV:
 		val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 		break;
 	default:
 		val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 		break;
 	}

 	return 0;
 }

 static int da9150_charger_battery_voltage_min(struct da9150_charger *charger,
 					      union power_supply_propval *val)
 {
 	u8 reg;

 	reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_C);

 	/* Value starts at 2500 mV, 50 mV increments, presented in uV */
 	val->intval = ((reg & DA9150_CHG_VFAULT_MASK) * 50000) + 2500000;

 	return 0;
 }

 static int da9150_charger_battery_voltage_now(struct da9150_charger *charger,
 					      union power_supply_propval *val)
 {
 	int v_val, ret;

 	/* Read processed value - mV units */
 	ret = iio_read_channel_processed(charger->vbat_chan, &v_val);
 	if (ret < 0)
 		return ret;

 	val->intval = v_val * 1000;

 	return 0;
 }

 static int da9150_charger_battery_current_max(struct da9150_charger *charger,
 					      union power_supply_propval *val)
 {
 	int reg;

 	reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_D);

 	/* 25mA increments */
 	val->intval = reg * 25000;

 	return 0;
 }

 static int da9150_charger_battery_voltage_max(struct da9150_charger *charger,
 					      union power_supply_propval *val)
 {
 	u8 reg;

 	reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_B);

 	/* Value starts at 3650 mV, 25 mV increments, presented in uV */
 	val->intval = ((reg & DA9150_CHG_VBAT_MASK) * 25000) + 3650000;
 	return 0;
 }

 static enum power_supply_property da9150_charger_bat_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_CHARGE_TYPE,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 };

 static int da9150_charger_battery_get_prop(struct power_supply *psy,
 					   enum power_supply_property psp,
 					   union power_supply_propval *val)
 {
 	struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent);
 	int ret;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		ret = da9150_charger_battery_status(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_ONLINE:
 		ret = da9150_charger_supply_online(charger, psy, val);
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
 		ret = da9150_charger_battery_health(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		ret = da9150_charger_battery_present(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_TYPE:
 		ret = da9150_charger_battery_charge_type(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 		ret = da9150_charger_battery_voltage_min(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		ret = da9150_charger_battery_voltage_now(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 		ret = da9150_charger_battery_current_max(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 		ret = da9150_charger_battery_voltage_max(charger, val);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static irqreturn_t da9150_charger_chg_irq(int irq, void *data)
 {
 	struct da9150_charger *charger = data;

 	power_supply_changed(charger->battery);

 	return IRQ_HANDLED;
 }

 static irqreturn_t da9150_charger_tjunc_irq(int irq, void *data)
 {
 	struct da9150_charger *charger = data;

 	/* Nothing we can really do except report this. */
 	dev_crit(charger->dev, "TJunc over temperature!!!\n");
 	power_supply_changed(charger->usb);

 	return IRQ_HANDLED;
 }

 static irqreturn_t da9150_charger_vfault_irq(int irq, void *data)
 {
 	struct da9150_charger *charger = data;

 	/* Nothing we can really do except report this. */
 	dev_crit(charger->dev, "VSYS under voltage!!!\n");
 	power_supply_changed(charger->usb);
 	power_supply_changed(charger->battery);

 	return IRQ_HANDLED;
 }

 static irqreturn_t da9150_charger_vbus_irq(int irq, void *data)
 {
 	struct da9150_charger *charger = data;
 	u8 reg;

 	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_H);

 	/* Charger plugged in or battery only */
 	switch (reg & DA9150_VBUS_STAT_MASK) {
 	case DA9150_VBUS_STAT_OFF:
 	case DA9150_VBUS_STAT_WAIT:
 		charger->supply_online = charger->battery;
 		break;
 	case DA9150_VBUS_STAT_CHG:
 		charger->supply_online = charger->usb;
 		break;
 	default:
 		dev_warn(charger->dev, "Unknown VBUS state - reg = 0x%x\n",
 			 reg);
 		charger->supply_online = NULL;
 		break;
 	}

 	power_supply_changed(charger->usb);
 	power_supply_changed(charger->battery);

 	return IRQ_HANDLED;
 }

 static void da9150_charger_otg_work(struct work_struct *data)
 {
 	struct da9150_charger *charger =
 		container_of(data, struct da9150_charger, otg_work);

 	switch (charger->usb_event) {
 	case USB_EVENT_ID:
 		/* Enable OTG Boost */
 		da9150_set_bits(charger->da9150, DA9150_PPR_BKCTRL_A,
 				DA9150_VBUS_MODE_MASK, DA9150_VBUS_MODE_OTG);
 		break;
 	case USB_EVENT_NONE:
 		/* Revert to charge mode */
 		power_supply_changed(charger->usb);
 		power_supply_changed(charger->battery);
 		da9150_set_bits(charger->da9150, DA9150_PPR_BKCTRL_A,
 				DA9150_VBUS_MODE_MASK, DA9150_VBUS_MODE_CHG);
 		break;
 	}
 }

 static int da9150_charger_otg_ncb(struct notifier_block *nb, unsigned long val,
 				  void *priv)
 {
 	struct da9150_charger *charger =
 		container_of(nb, struct da9150_charger, otg_nb);

 	dev_dbg(charger->dev, "DA9150 OTG notify %lu\n", val);

 	charger->usb_event = val;
 	schedule_work(&charger->otg_work);

 	return NOTIFY_OK;
 }

 static int da9150_charger_register_irq(struct platform_device *pdev,
 				       irq_handler_t handler,
 				       const char *irq_name)
 {
 	struct device *dev = &pdev->dev;
 	struct da9150_charger *charger = platform_get_drvdata(pdev);
 	int irq, ret;

 	irq = platform_get_irq_byname(pdev, irq_name);
 	if (irq < 0)
 		return irq;

 	ret = request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT, irq_name,
 				   charger);
 	if (ret)
 		dev_err(dev, "Failed to request IRQ %d: %d\n", irq, ret);

 	return ret;
 }

 static void da9150_charger_unregister_irq(struct platform_device *pdev,
 					  const char *irq_name)
 {
 	struct da9150_charger *charger = platform_get_drvdata(pdev);
 	int irq;

 	irq = platform_get_irq_byname(pdev, irq_name);
 	if (irq < 0)
 		return;

 	free_irq(irq, charger);
 }

 static const struct power_supply_desc usb_desc = {
 	.name		= "da9150-usb",
 	.type		= POWER_SUPPLY_TYPE_USB,
 	.properties	= da9150_charger_props,
 	.num_properties	= ARRAY_SIZE(da9150_charger_props),
 	.get_property	= da9150_charger_get_prop,
 };

 static const struct power_supply_desc battery_desc = {
 	.name		= "da9150-battery",
 	.type		= POWER_SUPPLY_TYPE_BATTERY,
 	.properties	= da9150_charger_bat_props,
 	.num_properties	= ARRAY_SIZE(da9150_charger_bat_props),
 	.get_property	= da9150_charger_battery_get_prop,
 };

 static int da9150_charger_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct da9150 *da9150 = dev_get_drvdata(dev->parent);
 	struct da9150_charger *charger;
 	u8 reg;
 	int ret;

 	charger = devm_kzalloc(dev, sizeof(struct da9150_charger), GFP_KERNEL);
 	if (!charger)
 		return -ENOMEM;

 	platform_set_drvdata(pdev, charger);
 	charger->da9150 = da9150;
 	charger->dev = dev;

 	/* Acquire ADC channels */
 	charger->ibus_chan = iio_channel_get(dev, "CHAN_IBUS");
 	if (IS_ERR(charger->ibus_chan)) {
 		ret = PTR_ERR(charger->ibus_chan);
 		goto ibus_chan_fail;
 	}

 	charger->vbus_chan = iio_channel_get(dev, "CHAN_VBUS");
 	if (IS_ERR(charger->vbus_chan)) {
 		ret = PTR_ERR(charger->vbus_chan);
 		goto vbus_chan_fail;
 	}

 	charger->tjunc_chan = iio_channel_get(dev, "CHAN_TJUNC");
 	if (IS_ERR(charger->tjunc_chan)) {
 		ret = PTR_ERR(charger->tjunc_chan);
 		goto tjunc_chan_fail;
 	}

 	charger->vbat_chan = iio_channel_get(dev, "CHAN_VBAT");
 	if (IS_ERR(charger->vbat_chan)) {
 		ret = PTR_ERR(charger->vbat_chan);
 		goto vbat_chan_fail;
 	}

 	/* Register power supplies */
 	charger->usb = power_supply_register(dev, &usb_desc, NULL);
 	if (IS_ERR(charger->usb)) {
 		ret = PTR_ERR(charger->usb);
 		goto usb_fail;
 	}

 	charger->battery = power_supply_register(dev, &battery_desc, NULL);
 	if (IS_ERR(charger->battery)) {
 		ret = PTR_ERR(charger->battery);
 		goto battery_fail;
 	}

 	/* Get initial online supply */
 	reg = da9150_reg_read(da9150, DA9150_STATUS_H);

 	switch (reg & DA9150_VBUS_STAT_MASK) {
 	case DA9150_VBUS_STAT_OFF:
 	case DA9150_VBUS_STAT_WAIT:
 		charger->supply_online = charger->battery;
 		break;
 	case DA9150_VBUS_STAT_CHG:
 		charger->supply_online = charger->usb;
 		break;
 	default:
 		dev_warn(dev, "Unknown VBUS state - reg = 0x%x\n", reg);
 		charger->supply_online = NULL;
 		break;
 	}

 	/* Setup OTG reporting & configuration */
 	charger->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 	if (!IS_ERR_OR_NULL(charger->usb_phy)) {
 		INIT_WORK(&charger->otg_work, da9150_charger_otg_work);
 		charger->otg_nb.notifier_call = da9150_charger_otg_ncb;
 		usb_register_notifier(charger->usb_phy, &charger->otg_nb);
 	}

 	/* Register IRQs */
 	ret = da9150_charger_register_irq(pdev, da9150_charger_chg_irq,
 					  "CHG_STATUS");
 	if (ret < 0)
 		goto chg_irq_fail;

 	ret = da9150_charger_register_irq(pdev, da9150_charger_tjunc_irq,
 					  "CHG_TJUNC");
 	if (ret < 0)
 		goto tjunc_irq_fail;

 	ret = da9150_charger_register_irq(pdev, da9150_charger_vfault_irq,
 					  "CHG_VFAULT");
 	if (ret < 0)
 		goto vfault_irq_fail;

 	ret = da9150_charger_register_irq(pdev, da9150_charger_vbus_irq,
 					  "CHG_VBUS");
 	if (ret < 0)
 		goto vbus_irq_fail;

 	return 0;


 vbus_irq_fail:
 	da9150_charger_unregister_irq(pdev, "CHG_VFAULT");
 vfault_irq_fail:
 	da9150_charger_unregister_irq(pdev, "CHG_TJUNC");
 tjunc_irq_fail:
 	da9150_charger_unregister_irq(pdev, "CHG_STATUS");
 chg_irq_fail:
 	if (!IS_ERR_OR_NULL(charger->usb_phy))
 		usb_unregister_notifier(charger->usb_phy, &charger->otg_nb);
 battery_fail:
 	power_supply_unregister(charger->usb);

 usb_fail:
 	iio_channel_release(charger->vbat_chan);

 vbat_chan_fail:
 	iio_channel_release(charger->tjunc_chan);

 tjunc_chan_fail:
 	iio_channel_release(charger->vbus_chan);

 vbus_chan_fail:
 	iio_channel_release(charger->ibus_chan);

 ibus_chan_fail:
 	return ret;
 }

 static int da9150_charger_remove(struct platform_device *pdev)
 {
 	struct da9150_charger *charger = platform_get_drvdata(pdev);
 	int irq;

 	/* Make sure IRQs are released before unregistering power supplies */
 	irq = platform_get_irq_byname(pdev, "CHG_VBUS");
 	free_irq(irq, charger);

 	irq = platform_get_irq_byname(pdev, "CHG_VFAULT");
 	free_irq(irq, charger);

 	irq = platform_get_irq_byname(pdev, "CHG_TJUNC");
 	free_irq(irq, charger);

 	irq = platform_get_irq_byname(pdev, "CHG_STATUS");
 	free_irq(irq, charger);

 	if (!IS_ERR_OR_NULL(charger->usb_phy))
 		usb_unregister_notifier(charger->usb_phy, &charger->otg_nb);
 	cancel_work_sync(&charger->otg_work);

 	power_supply_unregister(charger->battery);
 	power_supply_unregister(charger->usb);

 	/* Release ADC channels */
 	iio_channel_release(charger->ibus_chan);
 	iio_channel_release(charger->vbus_chan);
 	iio_channel_release(charger->tjunc_chan);
 	iio_channel_release(charger->vbat_chan);

 	return 0;
 }

 static struct platform_driver da9150_charger_driver = {
 	.driver = {
 		.name = "da9150-charger",
 	},
 	.probe = da9150_charger_probe,
 	.remove = da9150_charger_remove,
 };

 module_platform_driver(da9150_charger_driver);

 MODULE_DESCRIPTION("Charger Driver for DA9150");
 MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* DA9150 Charger Driver
	*
	* Copyright (c) 2014 Dialog Semiconductor
	*
	* Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/interrupt.h>
	#include <linux/power_supply.h>
	#include <linux/notifier.h>
	#include <linux/usb/phy.h>
	#include <linux/iio/consumer.h>
	#include <linux/mfd/da9150/core.h>
	#include <linux/mfd/da9150/registers.h>

	/* Private data */
	struct da9150_charger {
	struct da9150 *da9150;
	struct device *dev;

	struct power_supply *usb;
	struct power_supply *battery;
	struct power_supply *supply_online;

	struct usb_phy *usb_phy;
	struct notifier_block otg_nb;
	struct work_struct otg_work;
	unsigned long usb_event;

	struct iio_channel *ibus_chan;
	struct iio_channel *vbus_chan;
	struct iio_channel *tjunc_chan;
	struct iio_channel *vbat_chan;
	};

	static inline int da9150_charger_supply_online(struct da9150_charger *charger,
	struct power_supply *psy,
	union power_supply_propval *val)
	{
	val->intval = (psy == charger->supply_online) ? 1 : 0;

	return 0;
	}

	/* Charger Properties */
	static int da9150_charger_vbus_voltage_now(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	int v_val, ret;

	/* Read processed value - mV units */
	ret = iio_read_channel_processed(charger->vbus_chan, &v_val);
	if (ret < 0)
	return ret;

	/* Convert voltage to expected uV units */
	val->intval = v_val * 1000;

	return 0;
	}

	static int da9150_charger_ibus_current_avg(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	int i_val, ret;

	/* Read processed value - mA units */
	ret = iio_read_channel_processed(charger->ibus_chan, &i_val);
	if (ret < 0)
	return ret;

	/* Convert current to expected uA units */
	val->intval = i_val * 1000;

	return 0;
	}

	static int da9150_charger_tjunc_temp(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	int t_val, ret;

	/* Read processed value - 0.001 degrees C units */
	ret = iio_read_channel_processed(charger->tjunc_chan, &t_val);
	if (ret < 0)
	return ret;

	/* Convert temp to expect 0.1 degrees C units */
	val->intval = t_val / 100;

	return 0;
	}

	static enum power_supply_property da9150_charger_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_TEMP,
	};

	static int da9150_charger_get_prop(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent);
	int ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	ret = da9150_charger_supply_online(charger, psy, val);
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	ret = da9150_charger_vbus_voltage_now(charger, val);
	break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
	ret = da9150_charger_ibus_current_avg(charger, val);
	break;
	case POWER_SUPPLY_PROP_TEMP:
	ret = da9150_charger_tjunc_temp(charger, val);
	break;
	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	/* Battery Properties */
	static int da9150_charger_battery_status(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	u8 reg;

	/* Check to see if battery is discharging */
	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_H);

	if (((reg & DA9150_VBUS_STAT_MASK) == DA9150_VBUS_STAT_OFF) \|\|
	((reg & DA9150_VBUS_STAT_MASK) == DA9150_VBUS_STAT_WAIT)) {
	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;

	return 0;
	}

	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);

	/* Now check for other states */
	switch (reg & DA9150_CHG_STAT_MASK) {
	case DA9150_CHG_STAT_ACT:
	case DA9150_CHG_STAT_PRE:
	case DA9150_CHG_STAT_CC:
	case DA9150_CHG_STAT_CV:
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	break;
	case DA9150_CHG_STAT_OFF:
	case DA9150_CHG_STAT_SUSP:
	case DA9150_CHG_STAT_TEMP:
	case DA9150_CHG_STAT_TIME:
	case DA9150_CHG_STAT_BAT:
	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	break;
	case DA9150_CHG_STAT_FULL:
	val->intval = POWER_SUPPLY_STATUS_FULL;
	break;
	default:
	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
	break;
	}

	return 0;
	}

	static int da9150_charger_battery_health(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	u8 reg;

	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);

	/* Check if temperature limit reached */
	switch (reg & DA9150_CHG_TEMP_MASK) {
	case DA9150_CHG_TEMP_UNDER:
	val->intval = POWER_SUPPLY_HEALTH_COLD;
	return 0;
	case DA9150_CHG_TEMP_OVER:
	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	return 0;
	default:
	break;
	}

	/* Check for other health states */
	switch (reg & DA9150_CHG_STAT_MASK) {
	case DA9150_CHG_STAT_ACT:
	case DA9150_CHG_STAT_PRE:
	val->intval = POWER_SUPPLY_HEALTH_DEAD;
	break;
	case DA9150_CHG_STAT_TIME:
	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	break;
	default:
	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	break;
	}

	return 0;
	}

	static int da9150_charger_battery_present(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	u8 reg;

	/* Check if battery present or removed */
	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);
	if ((reg & DA9150_CHG_STAT_MASK) == DA9150_CHG_STAT_BAT)
	val->intval = 0;
	else
	val->intval = 1;

	return 0;
	}

	static int da9150_charger_battery_charge_type(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	u8 reg;

	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J);

	switch (reg & DA9150_CHG_STAT_MASK) {
	case DA9150_CHG_STAT_CC:
	val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
	break;
	case DA9150_CHG_STAT_ACT:
	case DA9150_CHG_STAT_PRE:
	case DA9150_CHG_STAT_CV:
	val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
	break;
	default:
	val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
	break;
	}

	return 0;
	}

	static int da9150_charger_battery_voltage_min(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	u8 reg;

	reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_C);

	/* Value starts at 2500 mV, 50 mV increments, presented in uV */
	val->intval = ((reg & DA9150_CHG_VFAULT_MASK) * 50000) + 2500000;

	return 0;
	}

	static int da9150_charger_battery_voltage_now(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	int v_val, ret;

	/* Read processed value - mV units */
	ret = iio_read_channel_processed(charger->vbat_chan, &v_val);
	if (ret < 0)
	return ret;

	val->intval = v_val * 1000;

	return 0;
	}

	static int da9150_charger_battery_current_max(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	int reg;

	reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_D);

	/* 25mA increments */
	val->intval = reg * 25000;

	return 0;
	}

	static int da9150_charger_battery_voltage_max(struct da9150_charger *charger,
	union power_supply_propval *val)
	{
	u8 reg;

	reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_B);

	/* Value starts at 3650 mV, 25 mV increments, presented in uV */
	val->intval = ((reg & DA9150_CHG_VBAT_MASK) * 25000) + 3650000;
	return 0;
	}

	static enum power_supply_property da9150_charger_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
	};

	static int da9150_charger_battery_get_prop(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent);
	int ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	ret = da9150_charger_battery_status(charger, val);
	break;
	case POWER_SUPPLY_PROP_ONLINE:
	ret = da9150_charger_supply_online(charger, psy, val);
	break;
	case POWER_SUPPLY_PROP_HEALTH:
	ret = da9150_charger_battery_health(charger, val);
	break;
	case POWER_SUPPLY_PROP_PRESENT:
	ret = da9150_charger_battery_present(charger, val);
	break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
	ret = da9150_charger_battery_charge_type(charger, val);
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	ret = da9150_charger_battery_voltage_min(charger, val);
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	ret = da9150_charger_battery_voltage_now(charger, val);
	break;
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
	ret = da9150_charger_battery_current_max(charger, val);
	break;
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
	ret = da9150_charger_battery_voltage_max(charger, val);
	break;
	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static irqreturn_t da9150_charger_chg_irq(int irq, void *data)
	{
	struct da9150_charger *charger = data;

	power_supply_changed(charger->battery);

	return IRQ_HANDLED;
	}

	static irqreturn_t da9150_charger_tjunc_irq(int irq, void *data)
	{
	struct da9150_charger *charger = data;

	/* Nothing we can really do except report this. */
	dev_crit(charger->dev, "TJunc over temperature!!!\n");
	power_supply_changed(charger->usb);

	return IRQ_HANDLED;
	}

	static irqreturn_t da9150_charger_vfault_irq(int irq, void *data)
	{
	struct da9150_charger *charger = data;

	/* Nothing we can really do except report this. */
	dev_crit(charger->dev, "VSYS under voltage!!!\n");
	power_supply_changed(charger->usb);
	power_supply_changed(charger->battery);

	return IRQ_HANDLED;
	}

	static irqreturn_t da9150_charger_vbus_irq(int irq, void *data)
	{
	struct da9150_charger *charger = data;
	u8 reg;

	reg = da9150_reg_read(charger->da9150, DA9150_STATUS_H);

	/* Charger plugged in or battery only */
	switch (reg & DA9150_VBUS_STAT_MASK) {
	case DA9150_VBUS_STAT_OFF:
	case DA9150_VBUS_STAT_WAIT:
	charger->supply_online = charger->battery;
	break;
	case DA9150_VBUS_STAT_CHG:
	charger->supply_online = charger->usb;
	break;
	default:
	dev_warn(charger->dev, "Unknown VBUS state - reg = 0x%x\n",
	reg);
	charger->supply_online = NULL;
	break;
	}

	power_supply_changed(charger->usb);
	power_supply_changed(charger->battery);

	return IRQ_HANDLED;
	}

	static void da9150_charger_otg_work(struct work_struct *data)
	{
	struct da9150_charger *charger =
	container_of(data, struct da9150_charger, otg_work);

	switch (charger->usb_event) {
	case USB_EVENT_ID:
	/* Enable OTG Boost */
	da9150_set_bits(charger->da9150, DA9150_PPR_BKCTRL_A,
	DA9150_VBUS_MODE_MASK, DA9150_VBUS_MODE_OTG);
	break;
	case USB_EVENT_NONE:
	/* Revert to charge mode */
	power_supply_changed(charger->usb);
	power_supply_changed(charger->battery);
	da9150_set_bits(charger->da9150, DA9150_PPR_BKCTRL_A,
	DA9150_VBUS_MODE_MASK, DA9150_VBUS_MODE_CHG);
	break;
	}
	}

	static int da9150_charger_otg_ncb(struct notifier_block *nb, unsigned long val,
	void *priv)
	{
	struct da9150_charger *charger =
	container_of(nb, struct da9150_charger, otg_nb);

	dev_dbg(charger->dev, "DA9150 OTG notify %lu\n", val);

	charger->usb_event = val;
	schedule_work(&charger->otg_work);

	return NOTIFY_OK;
	}

	static int da9150_charger_register_irq(struct platform_device *pdev,
	irq_handler_t handler,
	const char *irq_name)
	{
	struct device *dev = &pdev->dev;
	struct da9150_charger *charger = platform_get_drvdata(pdev);
	int irq, ret;

	irq = platform_get_irq_byname(pdev, irq_name);
	if (irq < 0)
	return irq;

	ret = request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT, irq_name,
	charger);
	if (ret)
	dev_err(dev, "Failed to request IRQ %d: %d\n", irq, ret);

	return ret;
	}

	static void da9150_charger_unregister_irq(struct platform_device *pdev,
	const char *irq_name)
	{
	struct da9150_charger *charger = platform_get_drvdata(pdev);
	int irq;

	irq = platform_get_irq_byname(pdev, irq_name);
	if (irq < 0)
	return;

	free_irq(irq, charger);
	}

	static const struct power_supply_desc usb_desc = {
	.name = "da9150-usb",
	.type = POWER_SUPPLY_TYPE_USB,
	.properties = da9150_charger_props,
	.num_properties = ARRAY_SIZE(da9150_charger_props),
	.get_property = da9150_charger_get_prop,
	};

	static const struct power_supply_desc battery_desc = {
	.name = "da9150-battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = da9150_charger_bat_props,
	.num_properties = ARRAY_SIZE(da9150_charger_bat_props),
	.get_property = da9150_charger_battery_get_prop,
	};

	static int da9150_charger_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct da9150 *da9150 = dev_get_drvdata(dev->parent);
	struct da9150_charger *charger;
	u8 reg;
	int ret;

	charger = devm_kzalloc(dev, sizeof(struct da9150_charger), GFP_KERNEL);
	if (!charger)
	return -ENOMEM;

	platform_set_drvdata(pdev, charger);
	charger->da9150 = da9150;
	charger->dev = dev;

	/* Acquire ADC channels */
	charger->ibus_chan = iio_channel_get(dev, "CHAN_IBUS");
	if (IS_ERR(charger->ibus_chan)) {
	ret = PTR_ERR(charger->ibus_chan);
	goto ibus_chan_fail;
	}

	charger->vbus_chan = iio_channel_get(dev, "CHAN_VBUS");
	if (IS_ERR(charger->vbus_chan)) {
	ret = PTR_ERR(charger->vbus_chan);
	goto vbus_chan_fail;
	}

	charger->tjunc_chan = iio_channel_get(dev, "CHAN_TJUNC");
	if (IS_ERR(charger->tjunc_chan)) {
	ret = PTR_ERR(charger->tjunc_chan);
	goto tjunc_chan_fail;
	}

	charger->vbat_chan = iio_channel_get(dev, "CHAN_VBAT");
	if (IS_ERR(charger->vbat_chan)) {
	ret = PTR_ERR(charger->vbat_chan);
	goto vbat_chan_fail;
	}

	/* Register power supplies */
	charger->usb = power_supply_register(dev, &usb_desc, NULL);
	if (IS_ERR(charger->usb)) {
	ret = PTR_ERR(charger->usb);
	goto usb_fail;
	}

	charger->battery = power_supply_register(dev, &battery_desc, NULL);
	if (IS_ERR(charger->battery)) {
	ret = PTR_ERR(charger->battery);
	goto battery_fail;
	}

	/* Get initial online supply */
	reg = da9150_reg_read(da9150, DA9150_STATUS_H);

	switch (reg & DA9150_VBUS_STAT_MASK) {
	case DA9150_VBUS_STAT_OFF:
	case DA9150_VBUS_STAT_WAIT:
	charger->supply_online = charger->battery;
	break;
	case DA9150_VBUS_STAT_CHG:
	charger->supply_online = charger->usb;
	break;
	default:
	dev_warn(dev, "Unknown VBUS state - reg = 0x%x\n", reg);
	charger->supply_online = NULL;
	break;
	}

	/* Setup OTG reporting & configuration */
	charger->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
	if (!IS_ERR_OR_NULL(charger->usb_phy)) {
	INIT_WORK(&charger->otg_work, da9150_charger_otg_work);
	charger->otg_nb.notifier_call = da9150_charger_otg_ncb;
	usb_register_notifier(charger->usb_phy, &charger->otg_nb);
	}

	/* Register IRQs */
	ret = da9150_charger_register_irq(pdev, da9150_charger_chg_irq,
	"CHG_STATUS");
	if (ret < 0)
	goto chg_irq_fail;

	ret = da9150_charger_register_irq(pdev, da9150_charger_tjunc_irq,
	"CHG_TJUNC");
	if (ret < 0)
	goto tjunc_irq_fail;

	ret = da9150_charger_register_irq(pdev, da9150_charger_vfault_irq,
	"CHG_VFAULT");
	if (ret < 0)
	goto vfault_irq_fail;

	ret = da9150_charger_register_irq(pdev, da9150_charger_vbus_irq,
	"CHG_VBUS");
	if (ret < 0)
	goto vbus_irq_fail;

	return 0;


	vbus_irq_fail:
	da9150_charger_unregister_irq(pdev, "CHG_VFAULT");
	vfault_irq_fail:
	da9150_charger_unregister_irq(pdev, "CHG_TJUNC");
	tjunc_irq_fail:
	da9150_charger_unregister_irq(pdev, "CHG_STATUS");
	chg_irq_fail:
	if (!IS_ERR_OR_NULL(charger->usb_phy))
	usb_unregister_notifier(charger->usb_phy, &charger->otg_nb);
	battery_fail:
	power_supply_unregister(charger->usb);

	usb_fail:
	iio_channel_release(charger->vbat_chan);

	vbat_chan_fail:
	iio_channel_release(charger->tjunc_chan);

	tjunc_chan_fail:
	iio_channel_release(charger->vbus_chan);

	vbus_chan_fail:
	iio_channel_release(charger->ibus_chan);

	ibus_chan_fail:
	return ret;
	}

	static int da9150_charger_remove(struct platform_device *pdev)
	{
	struct da9150_charger *charger = platform_get_drvdata(pdev);
	int irq;

	/* Make sure IRQs are released before unregistering power supplies */
	irq = platform_get_irq_byname(pdev, "CHG_VBUS");
	free_irq(irq, charger);

	irq = platform_get_irq_byname(pdev, "CHG_VFAULT");
	free_irq(irq, charger);

	irq = platform_get_irq_byname(pdev, "CHG_TJUNC");
	free_irq(irq, charger);

	irq = platform_get_irq_byname(pdev, "CHG_STATUS");
	free_irq(irq, charger);

	if (!IS_ERR_OR_NULL(charger->usb_phy))
	usb_unregister_notifier(charger->usb_phy, &charger->otg_nb);
	cancel_work_sync(&charger->otg_work);

	power_supply_unregister(charger->battery);
	power_supply_unregister(charger->usb);

	/* Release ADC channels */
	iio_channel_release(charger->ibus_chan);
	iio_channel_release(charger->vbus_chan);
	iio_channel_release(charger->tjunc_chan);
	iio_channel_release(charger->vbat_chan);

	return 0;
	}

	static struct platform_driver da9150_charger_driver = {
	.driver = {
	.name = "da9150-charger",
	},
	.probe = da9150_charger_probe,
	.remove = da9150_charger_remove,
	};

	module_platform_driver(da9150_charger_driver);

	MODULE_DESCRIPTION("Charger Driver for DA9150");
	MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>");
	MODULE_LICENSE("GPL");