drivers/power/supply/axp20x_usb_power.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * AXP20x PMIC USB power supply status driver
  *
  * Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
  * Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
  */

 #include <linux/bitops.h>
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mfd/axp20x.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/iio/consumer.h>
 #include <linux/workqueue.h>

 #define DRVNAME "axp20x-usb-power-supply"

 #define AXP20X_PWR_STATUS_VBUS_PRESENT	BIT(5)
 #define AXP20X_PWR_STATUS_VBUS_USED	BIT(4)

 #define AXP20X_USB_STATUS_VBUS_VALID	BIT(2)

 #define AXP20X_VBUS_VHOLD_uV(b)		(4000000 + (((b) >> 3) & 7) * 100000)
 #define AXP20X_VBUS_VHOLD_MASK		GENMASK(5, 3)
 #define AXP20X_VBUS_VHOLD_OFFSET	3
 #define AXP20X_VBUS_CLIMIT_MASK		3
 #define AXP20X_VBUS_CLIMIT_900mA	0
 #define AXP20X_VBUS_CLIMIT_500mA	1
 #define AXP20X_VBUS_CLIMIT_100mA	2
 #define AXP20X_VBUS_CLIMIT_NONE		3

 #define AXP813_VBUS_CLIMIT_900mA	0
 #define AXP813_VBUS_CLIMIT_1500mA	1
 #define AXP813_VBUS_CLIMIT_2000mA	2
 #define AXP813_VBUS_CLIMIT_2500mA	3

 #define AXP20X_ADC_EN1_VBUS_CURR	BIT(2)
 #define AXP20X_ADC_EN1_VBUS_VOLT	BIT(3)

 #define AXP20X_VBUS_MON_VBUS_VALID	BIT(3)

 /*
  * Note do not raise the debounce time, we must report Vusb high within
  * 100ms otherwise we get Vbus errors in musb.
  */
 #define DEBOUNCE_TIME			msecs_to_jiffies(50)

 struct axp20x_usb_power {
 	struct device_node *np;
 	struct regmap *regmap;
 	struct power_supply *supply;
 	enum axp20x_variants axp20x_id;
 	struct iio_channel *vbus_v;
 	struct iio_channel *vbus_i;
 	struct delayed_work vbus_detect;
 	unsigned int old_status;
 };

 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
 {
 	struct axp20x_usb_power *power = devid;

 	power_supply_changed(power->supply);

 	return IRQ_HANDLED;
 }

 static void axp20x_usb_power_poll_vbus(struct work_struct *work)
 {
 	struct axp20x_usb_power *power =
 		container_of(work, struct axp20x_usb_power, vbus_detect.work);
 	unsigned int val;
 	int ret;

 	ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 	if (ret)
 		goto out;

 	val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED);
 	if (val != power->old_status)
 		power_supply_changed(power->supply);

 	power->old_status = val;

 out:
 	mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
 }

 static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
 {
 	if (power->axp20x_id >= AXP221_ID)
 		return true;

 	return false;
 }

 static int axp20x_get_current_max(struct axp20x_usb_power *power, int *val)
 {
 	unsigned int v;
 	int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);

 	if (ret)
 		return ret;

 	switch (v & AXP20X_VBUS_CLIMIT_MASK) {
 	case AXP20X_VBUS_CLIMIT_100mA:
 		if (power->axp20x_id == AXP221_ID)
 			*val = -1; /* No 100mA limit */
 		else
 			*val = 100000;
 		break;
 	case AXP20X_VBUS_CLIMIT_500mA:
 		*val = 500000;
 		break;
 	case AXP20X_VBUS_CLIMIT_900mA:
 		*val = 900000;
 		break;
 	case AXP20X_VBUS_CLIMIT_NONE:
 		*val = -1;
 		break;
 	}

 	return 0;
 }

 static int axp813_get_current_max(struct axp20x_usb_power *power, int *val)
 {
 	unsigned int v;
 	int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);

 	if (ret)
 		return ret;

 	switch (v & AXP20X_VBUS_CLIMIT_MASK) {
 	case AXP813_VBUS_CLIMIT_900mA:
 		*val = 900000;
 		break;
 	case AXP813_VBUS_CLIMIT_1500mA:
 		*val = 1500000;
 		break;
 	case AXP813_VBUS_CLIMIT_2000mA:
 		*val = 2000000;
 		break;
 	case AXP813_VBUS_CLIMIT_2500mA:
 		*val = 2500000;
 		break;
 	}
 	return 0;
 }

 static int axp20x_usb_power_get_property(struct power_supply *psy,
 	enum power_supply_property psp, union power_supply_propval *val)
 {
 	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 	unsigned int input, v;
 	int ret;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 		ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
 		if (ret)
 			return ret;

 		val->intval = AXP20X_VBUS_VHOLD_uV(v);
 		return 0;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 			ret = iio_read_channel_processed(power->vbus_v,
 							 &val->intval);
 			if (ret)
 				return ret;

 			/*
 			 * IIO framework gives mV but Power Supply framework
 			 * gives uV.
 			 */
 			val->intval *= 1000;
 			return 0;
 		}

 		ret = axp20x_read_variable_width(power->regmap,
 						 AXP20X_VBUS_V_ADC_H, 12);
 		if (ret < 0)
 			return ret;

 		val->intval = ret * 1700; /* 1 step = 1.7 mV */
 		return 0;
 	case POWER_SUPPLY_PROP_CURRENT_MAX:
 		if (power->axp20x_id == AXP813_ID)
 			return axp813_get_current_max(power, &val->intval);
 		return axp20x_get_current_max(power, &val->intval);
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
 		if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 			ret = iio_read_channel_processed(power->vbus_i,
 							 &val->intval);
 			if (ret)
 				return ret;

 			/*
 			 * IIO framework gives mA but Power Supply framework
 			 * gives uA.
 			 */
 			val->intval *= 1000;
 			return 0;
 		}

 		ret = axp20x_read_variable_width(power->regmap,
 						 AXP20X_VBUS_I_ADC_H, 12);
 		if (ret < 0)
 			return ret;

 		val->intval = ret * 375; /* 1 step = 0.375 mA */
 		return 0;
 	default:
 		break;
 	}

 	/* All the properties below need the input-status reg value */
 	ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
 	if (ret)
 		return ret;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_HEALTH:
 		if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
 			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
 			break;
 		}

 		val->intval = POWER_SUPPLY_HEALTH_GOOD;

 		if (power->axp20x_id == AXP202_ID) {
 			ret = regmap_read(power->regmap,
 					  AXP20X_USB_OTG_STATUS, &v);
 			if (ret)
 				return ret;

 			if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
 				val->intval =
 					POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 		}
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
 		break;
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
 					    int intval)
 {
 	int val;

 	switch (intval) {
 	case 4000000:
 	case 4100000:
 	case 4200000:
 	case 4300000:
 	case 4400000:
 	case 4500000:
 	case 4600000:
 	case 4700000:
 		val = (intval - 4000000) / 100000;
 		return regmap_update_bits(power->regmap,
 					  AXP20X_VBUS_IPSOUT_MGMT,
 					  AXP20X_VBUS_VHOLD_MASK,
 					  val << AXP20X_VBUS_VHOLD_OFFSET);
 	default:
 		return -EINVAL;
 	}

 	return -EINVAL;
 }

 static int axp813_usb_power_set_current_max(struct axp20x_usb_power *power,
 					    int intval)
 {
 	int val;

 	switch (intval) {
 	case 900000:
 		return regmap_update_bits(power->regmap,
 					  AXP20X_VBUS_IPSOUT_MGMT,
 					  AXP20X_VBUS_CLIMIT_MASK,
 					  AXP813_VBUS_CLIMIT_900mA);
 	case 1500000:
 	case 2000000:
 	case 2500000:
 		val = (intval - 1000000) / 500000;
 		return regmap_update_bits(power->regmap,
 					  AXP20X_VBUS_IPSOUT_MGMT,
 					  AXP20X_VBUS_CLIMIT_MASK, val);
 	default:
 		return -EINVAL;
 	}

 	return -EINVAL;
 }

 static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
 					    int intval)
 {
 	int val;

 	switch (intval) {
 	case 100000:
 		if (power->axp20x_id == AXP221_ID)
 			return -EINVAL;
 		/* fall through */
 	case 500000:
 	case 900000:
 		val = (900000 - intval) / 400000;
 		return regmap_update_bits(power->regmap,
 					  AXP20X_VBUS_IPSOUT_MGMT,
 					  AXP20X_VBUS_CLIMIT_MASK, val);
 	default:
 		return -EINVAL;
 	}

 	return -EINVAL;
 }

 static int axp20x_usb_power_set_property(struct power_supply *psy,
 					 enum power_supply_property psp,
 					 const union power_supply_propval *val)
 {
 	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 		return axp20x_usb_power_set_voltage_min(power, val->intval);

 	case POWER_SUPPLY_PROP_CURRENT_MAX:
 		if (power->axp20x_id == AXP813_ID)
 			return axp813_usb_power_set_current_max(power,
 								val->intval);
 		return axp20x_usb_power_set_current_max(power, val->intval);

 	default:
 		return -EINVAL;
 	}

 	return -EINVAL;
 }

 static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
 					   enum power_supply_property psp)
 {
 	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 	       psp == POWER_SUPPLY_PROP_CURRENT_MAX;
 }

 static enum power_supply_property axp20x_usb_power_properties[] = {
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_MAX,
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 };

 static enum power_supply_property axp22x_usb_power_properties[] = {
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN,
 	POWER_SUPPLY_PROP_CURRENT_MAX,
 };

 static const struct power_supply_desc axp20x_usb_power_desc = {
 	.name = "axp20x-usb",
 	.type = POWER_SUPPLY_TYPE_USB,
 	.properties = axp20x_usb_power_properties,
 	.num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
 	.property_is_writeable = axp20x_usb_power_prop_writeable,
 	.get_property = axp20x_usb_power_get_property,
 	.set_property = axp20x_usb_power_set_property,
 };

 static const struct power_supply_desc axp22x_usb_power_desc = {
 	.name = "axp20x-usb",
 	.type = POWER_SUPPLY_TYPE_USB,
 	.properties = axp22x_usb_power_properties,
 	.num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
 	.property_is_writeable = axp20x_usb_power_prop_writeable,
 	.get_property = axp20x_usb_power_get_property,
 	.set_property = axp20x_usb_power_set_property,
 };

 static int configure_iio_channels(struct platform_device *pdev,
 				  struct axp20x_usb_power *power)
 {
 	power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
 	if (IS_ERR(power->vbus_v)) {
 		if (PTR_ERR(power->vbus_v) == -ENODEV)
 			return -EPROBE_DEFER;
 		return PTR_ERR(power->vbus_v);
 	}

 	power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
 	if (IS_ERR(power->vbus_i)) {
 		if (PTR_ERR(power->vbus_i) == -ENODEV)
 			return -EPROBE_DEFER;
 		return PTR_ERR(power->vbus_i);
 	}

 	return 0;
 }

 static int configure_adc_registers(struct axp20x_usb_power *power)
 {
 	/* Enable vbus voltage and current measurement */
 	return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
 				  AXP20X_ADC_EN1_VBUS_CURR |
 				  AXP20X_ADC_EN1_VBUS_VOLT,
 				  AXP20X_ADC_EN1_VBUS_CURR |
 				  AXP20X_ADC_EN1_VBUS_VOLT);
 }

 static int axp20x_usb_power_probe(struct platform_device *pdev)
 {
 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 	struct power_supply_config psy_cfg = {};
 	struct axp20x_usb_power *power;
 	static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
 		"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
 	static const char * const axp22x_irq_names[] = {
 		"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
 	const char * const *irq_names;
 	const struct power_supply_desc *usb_power_desc;
 	int i, irq, ret;

 	if (!of_device_is_available(pdev->dev.of_node))
 		return -ENODEV;

 	if (!axp20x) {
 		dev_err(&pdev->dev, "Parent drvdata not set\n");
 		return -EINVAL;
 	}

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

 	platform_set_drvdata(pdev, power);
 	power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
 								&pdev->dev);

 	power->np = pdev->dev.of_node;
 	power->regmap = axp20x->regmap;

 	if (power->axp20x_id == AXP202_ID) {
 		/* Enable vbus valid checking */
 		ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
 					 AXP20X_VBUS_MON_VBUS_VALID,
 					 AXP20X_VBUS_MON_VBUS_VALID);
 		if (ret)
 			return ret;

 		if (IS_ENABLED(CONFIG_AXP20X_ADC))
 			ret = configure_iio_channels(pdev, power);
 		else
 			ret = configure_adc_registers(power);

 		if (ret)
 			return ret;

 		usb_power_desc = &axp20x_usb_power_desc;
 		irq_names = axp20x_irq_names;
 	} else if (power->axp20x_id == AXP221_ID ||
 		   power->axp20x_id == AXP223_ID ||
 		   power->axp20x_id == AXP813_ID) {
 		usb_power_desc = &axp22x_usb_power_desc;
 		irq_names = axp22x_irq_names;
 	} else {
 		dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
 			axp20x->variant);
 		return -EINVAL;
 	}

 	psy_cfg.of_node = pdev->dev.of_node;
 	psy_cfg.drv_data = power;

 	power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
 						   &psy_cfg);
 	if (IS_ERR(power->supply))
 		return PTR_ERR(power->supply);

 	/* Request irqs after registering, as irqs may trigger immediately */
 	for (i = 0; irq_names[i]; i++) {
 		irq = platform_get_irq_byname(pdev, irq_names[i]);
 		if (irq < 0) {
 			dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
 				 irq_names[i], irq);
 			continue;
 		}
 		irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 		ret = devm_request_any_context_irq(&pdev->dev, irq,
 				axp20x_usb_power_irq, 0, DRVNAME, power);
 		if (ret < 0)
 			dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
 				 irq_names[i], ret);
 	}

 	INIT_DELAYED_WORK(&power->vbus_detect, axp20x_usb_power_poll_vbus);
 	if (axp20x_usb_vbus_needs_polling(power))
 		queue_delayed_work(system_wq, &power->vbus_detect, 0);

 	return 0;
 }

 static int axp20x_usb_power_remove(struct platform_device *pdev)
 {
 	struct axp20x_usb_power *power = platform_get_drvdata(pdev);

 	cancel_delayed_work_sync(&power->vbus_detect);

 	return 0;
 }

 static const struct of_device_id axp20x_usb_power_match[] = {
 	{
 		.compatible = "x-powers,axp202-usb-power-supply",
 		.data = (void *)AXP202_ID,
 	}, {
 		.compatible = "x-powers,axp221-usb-power-supply",
 		.data = (void *)AXP221_ID,
 	}, {
 		.compatible = "x-powers,axp223-usb-power-supply",
 		.data = (void *)AXP223_ID,
 	}, {
 		.compatible = "x-powers,axp813-usb-power-supply",
 		.data = (void *)AXP813_ID,
 	}, { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);

 static struct platform_driver axp20x_usb_power_driver = {
 	.probe = axp20x_usb_power_probe,
 	.remove = axp20x_usb_power_remove,
 	.driver = {
 		.name = DRVNAME,
 		.of_match_table = axp20x_usb_power_match,
 	},
 };

 module_platform_driver(axp20x_usb_power_driver);

 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* AXP20x PMIC USB power supply status driver
	*
	* Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
	* Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
	*/

	#include <linux/bitops.h>
	#include <linux/device.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/mfd/axp20x.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <linux/iio/consumer.h>
	#include <linux/workqueue.h>

	#define DRVNAME "axp20x-usb-power-supply"

	#define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
	#define AXP20X_PWR_STATUS_VBUS_USED BIT(4)

	#define AXP20X_USB_STATUS_VBUS_VALID BIT(2)

	#define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
	#define AXP20X_VBUS_VHOLD_MASK GENMASK(5, 3)
	#define AXP20X_VBUS_VHOLD_OFFSET 3
	#define AXP20X_VBUS_CLIMIT_MASK 3
	#define AXP20X_VBUS_CLIMIT_900mA 0
	#define AXP20X_VBUS_CLIMIT_500mA 1
	#define AXP20X_VBUS_CLIMIT_100mA 2
	#define AXP20X_VBUS_CLIMIT_NONE 3

	#define AXP813_VBUS_CLIMIT_900mA 0
	#define AXP813_VBUS_CLIMIT_1500mA 1
	#define AXP813_VBUS_CLIMIT_2000mA 2
	#define AXP813_VBUS_CLIMIT_2500mA 3

	#define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
	#define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)

	#define AXP20X_VBUS_MON_VBUS_VALID BIT(3)

	/*
	* Note do not raise the debounce time, we must report Vusb high within
	* 100ms otherwise we get Vbus errors in musb.
	*/
	#define DEBOUNCE_TIME msecs_to_jiffies(50)

	struct axp20x_usb_power {
	struct device_node *np;
	struct regmap *regmap;
	struct power_supply *supply;
	enum axp20x_variants axp20x_id;
	struct iio_channel *vbus_v;
	struct iio_channel *vbus_i;
	struct delayed_work vbus_detect;
	unsigned int old_status;
	};

	static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
	{
	struct axp20x_usb_power *power = devid;

	power_supply_changed(power->supply);

	return IRQ_HANDLED;
	}

	static void axp20x_usb_power_poll_vbus(struct work_struct *work)
	{
	struct axp20x_usb_power *power =
	container_of(work, struct axp20x_usb_power, vbus_detect.work);
	unsigned int val;
	int ret;

	ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
	if (ret)
	goto out;

	val &= (AXP20X_PWR_STATUS_VBUS_PRESENT \| AXP20X_PWR_STATUS_VBUS_USED);
	if (val != power->old_status)
	power_supply_changed(power->supply);

	power->old_status = val;

	out:
	mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
	}

	static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
	{
	if (power->axp20x_id >= AXP221_ID)
	return true;

	return false;
	}

	static int axp20x_get_current_max(struct axp20x_usb_power power, int val)
	{
	unsigned int v;
	int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);

	if (ret)
	return ret;

	switch (v & AXP20X_VBUS_CLIMIT_MASK) {
	case AXP20X_VBUS_CLIMIT_100mA:
	if (power->axp20x_id == AXP221_ID)
	val = -1; / No 100mA limit */
	else
	*val = 100000;
	break;
	case AXP20X_VBUS_CLIMIT_500mA:
	*val = 500000;
	break;
	case AXP20X_VBUS_CLIMIT_900mA:
	*val = 900000;
	break;
	case AXP20X_VBUS_CLIMIT_NONE:
	*val = -1;
	break;
	}

	return 0;
	}

	static int axp813_get_current_max(struct axp20x_usb_power power, int val)
	{
	unsigned int v;
	int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);

	if (ret)
	return ret;

	switch (v & AXP20X_VBUS_CLIMIT_MASK) {
	case AXP813_VBUS_CLIMIT_900mA:
	*val = 900000;
	break;
	case AXP813_VBUS_CLIMIT_1500mA:
	*val = 1500000;
	break;
	case AXP813_VBUS_CLIMIT_2000mA:
	*val = 2000000;
	break;
	case AXP813_VBUS_CLIMIT_2500mA:
	*val = 2500000;
	break;
	}
	return 0;
	}

	static int axp20x_usb_power_get_property(struct power_supply *psy,
	enum power_supply_property psp, union power_supply_propval *val)
	{
	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
	unsigned int input, v;
	int ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
	if (ret)
	return ret;

	val->intval = AXP20X_VBUS_VHOLD_uV(v);
	return 0;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
	ret = iio_read_channel_processed(power->vbus_v,
	&val->intval);
	if (ret)
	return ret;

	/*
	* IIO framework gives mV but Power Supply framework
	* gives uV.
	*/
	val->intval *= 1000;
	return 0;
	}

	ret = axp20x_read_variable_width(power->regmap,
	AXP20X_VBUS_V_ADC_H, 12);
	if (ret < 0)
	return ret;

	val->intval = ret * 1700; /* 1 step = 1.7 mV */
	return 0;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
	if (power->axp20x_id == AXP813_ID)
	return axp813_get_current_max(power, &val->intval);
	return axp20x_get_current_max(power, &val->intval);
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
	ret = iio_read_channel_processed(power->vbus_i,
	&val->intval);
	if (ret)
	return ret;

	/*
	* IIO framework gives mA but Power Supply framework
	* gives uA.
	*/
	val->intval *= 1000;
	return 0;
	}

	ret = axp20x_read_variable_width(power->regmap,
	AXP20X_VBUS_I_ADC_H, 12);
	if (ret < 0)
	return ret;

	val->intval = ret * 375; /* 1 step = 0.375 mA */
	return 0;
	default:
	break;
	}

	/* All the properties below need the input-status reg value */
	ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
	if (ret)
	return ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_HEALTH:
	if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
	val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
	break;
	}

	val->intval = POWER_SUPPLY_HEALTH_GOOD;

	if (power->axp20x_id == AXP202_ID) {
	ret = regmap_read(power->regmap,
	AXP20X_USB_OTG_STATUS, &v);
	if (ret)
	return ret;

	if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
	val->intval =
	POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	}
	break;
	case POWER_SUPPLY_PROP_PRESENT:
	val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
	break;
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
	int intval)
	{
	int val;

	switch (intval) {
	case 4000000:
	case 4100000:
	case 4200000:
	case 4300000:
	case 4400000:
	case 4500000:
	case 4600000:
	case 4700000:
	val = (intval - 4000000) / 100000;
	return regmap_update_bits(power->regmap,
	AXP20X_VBUS_IPSOUT_MGMT,
	AXP20X_VBUS_VHOLD_MASK,
	val << AXP20X_VBUS_VHOLD_OFFSET);
	default:
	return -EINVAL;
	}

	return -EINVAL;
	}

	static int axp813_usb_power_set_current_max(struct axp20x_usb_power *power,
	int intval)
	{
	int val;

	switch (intval) {
	case 900000:
	return regmap_update_bits(power->regmap,
	AXP20X_VBUS_IPSOUT_MGMT,
	AXP20X_VBUS_CLIMIT_MASK,
	AXP813_VBUS_CLIMIT_900mA);
	case 1500000:
	case 2000000:
	case 2500000:
	val = (intval - 1000000) / 500000;
	return regmap_update_bits(power->regmap,
	AXP20X_VBUS_IPSOUT_MGMT,
	AXP20X_VBUS_CLIMIT_MASK, val);
	default:
	return -EINVAL;
	}

	return -EINVAL;
	}

	static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
	int intval)
	{
	int val;

	switch (intval) {
	case 100000:
	if (power->axp20x_id == AXP221_ID)
	return -EINVAL;
	/* fall through */
	case 500000:
	case 900000:
	val = (900000 - intval) / 400000;
	return regmap_update_bits(power->regmap,
	AXP20X_VBUS_IPSOUT_MGMT,
	AXP20X_VBUS_CLIMIT_MASK, val);
	default:
	return -EINVAL;
	}

	return -EINVAL;
	}

	static int axp20x_usb_power_set_property(struct power_supply *psy,
	enum power_supply_property psp,
	const union power_supply_propval *val)
	{
	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	return axp20x_usb_power_set_voltage_min(power, val->intval);

	case POWER_SUPPLY_PROP_CURRENT_MAX:
	if (power->axp20x_id == AXP813_ID)
	return axp813_usb_power_set_current_max(power,
	val->intval);
	return axp20x_usb_power_set_current_max(power, val->intval);

	default:
	return -EINVAL;
	}

	return -EINVAL;
	}

	static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
	enum power_supply_property psp)
	{
	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN \|\|
	psp == POWER_SUPPLY_PROP_CURRENT_MAX;
	}

	static enum power_supply_property axp20x_usb_power_properties[] = {
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_MIN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	};

	static enum power_supply_property axp22x_usb_power_properties[] = {
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_MIN,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	};

	static const struct power_supply_desc axp20x_usb_power_desc = {
	.name = "axp20x-usb",
	.type = POWER_SUPPLY_TYPE_USB,
	.properties = axp20x_usb_power_properties,
	.num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
	.property_is_writeable = axp20x_usb_power_prop_writeable,
	.get_property = axp20x_usb_power_get_property,
	.set_property = axp20x_usb_power_set_property,
	};

	static const struct power_supply_desc axp22x_usb_power_desc = {
	.name = "axp20x-usb",
	.type = POWER_SUPPLY_TYPE_USB,
	.properties = axp22x_usb_power_properties,
	.num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
	.property_is_writeable = axp20x_usb_power_prop_writeable,
	.get_property = axp20x_usb_power_get_property,
	.set_property = axp20x_usb_power_set_property,
	};

	static int configure_iio_channels(struct platform_device *pdev,
	struct axp20x_usb_power *power)
	{
	power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
	if (IS_ERR(power->vbus_v)) {
	if (PTR_ERR(power->vbus_v) == -ENODEV)
	return -EPROBE_DEFER;
	return PTR_ERR(power->vbus_v);
	}

	power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
	if (IS_ERR(power->vbus_i)) {
	if (PTR_ERR(power->vbus_i) == -ENODEV)
	return -EPROBE_DEFER;
	return PTR_ERR(power->vbus_i);
	}

	return 0;
	}

	static int configure_adc_registers(struct axp20x_usb_power *power)
	{
	/* Enable vbus voltage and current measurement */
	return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
	AXP20X_ADC_EN1_VBUS_CURR \|
	AXP20X_ADC_EN1_VBUS_VOLT,
	AXP20X_ADC_EN1_VBUS_CURR \|
	AXP20X_ADC_EN1_VBUS_VOLT);
	}

	static int axp20x_usb_power_probe(struct platform_device *pdev)
	{
	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
	struct power_supply_config psy_cfg = {};
	struct axp20x_usb_power *power;
	static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
	"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
	static const char * const axp22x_irq_names[] = {
	"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
	const char * const *irq_names;
	const struct power_supply_desc *usb_power_desc;
	int i, irq, ret;

	if (!of_device_is_available(pdev->dev.of_node))
	return -ENODEV;

	if (!axp20x) {
	dev_err(&pdev->dev, "Parent drvdata not set\n");
	return -EINVAL;
	}

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

	platform_set_drvdata(pdev, power);
	power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
	&pdev->dev);

	power->np = pdev->dev.of_node;
	power->regmap = axp20x->regmap;

	if (power->axp20x_id == AXP202_ID) {
	/* Enable vbus valid checking */
	ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
	AXP20X_VBUS_MON_VBUS_VALID,
	AXP20X_VBUS_MON_VBUS_VALID);
	if (ret)
	return ret;

	if (IS_ENABLED(CONFIG_AXP20X_ADC))
	ret = configure_iio_channels(pdev, power);
	else
	ret = configure_adc_registers(power);

	if (ret)
	return ret;

	usb_power_desc = &axp20x_usb_power_desc;
	irq_names = axp20x_irq_names;
	} else if (power->axp20x_id == AXP221_ID \|\|
	power->axp20x_id == AXP223_ID \|\|
	power->axp20x_id == AXP813_ID) {
	usb_power_desc = &axp22x_usb_power_desc;
	irq_names = axp22x_irq_names;
	} else {
	dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
	axp20x->variant);
	return -EINVAL;
	}

	psy_cfg.of_node = pdev->dev.of_node;
	psy_cfg.drv_data = power;

	power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
	&psy_cfg);
	if (IS_ERR(power->supply))
	return PTR_ERR(power->supply);

	/* Request irqs after registering, as irqs may trigger immediately */
	for (i = 0; irq_names[i]; i++) {
	irq = platform_get_irq_byname(pdev, irq_names[i]);
	if (irq < 0) {
	dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
	irq_names[i], irq);
	continue;
	}
	irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
	ret = devm_request_any_context_irq(&pdev->dev, irq,
	axp20x_usb_power_irq, 0, DRVNAME, power);
	if (ret < 0)
	dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
	irq_names[i], ret);
	}

	INIT_DELAYED_WORK(&power->vbus_detect, axp20x_usb_power_poll_vbus);
	if (axp20x_usb_vbus_needs_polling(power))
	queue_delayed_work(system_wq, &power->vbus_detect, 0);

	return 0;
	}

	static int axp20x_usb_power_remove(struct platform_device *pdev)
	{
	struct axp20x_usb_power *power = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&power->vbus_detect);

	return 0;
	}

	static const struct of_device_id axp20x_usb_power_match[] = {
	{
	.compatible = "x-powers,axp202-usb-power-supply",
	.data = (void *)AXP202_ID,
	}, {
	.compatible = "x-powers,axp221-usb-power-supply",
	.data = (void *)AXP221_ID,
	}, {
	.compatible = "x-powers,axp223-usb-power-supply",
	.data = (void *)AXP223_ID,
	}, {
	.compatible = "x-powers,axp813-usb-power-supply",
	.data = (void *)AXP813_ID,
	}, { /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);

	static struct platform_driver axp20x_usb_power_driver = {
	.probe = axp20x_usb_power_probe,
	.remove = axp20x_usb_power_remove,
	.driver = {
	.name = DRVNAME,
	.of_match_table = axp20x_usb_power_match,
	},
	};

	module_platform_driver(axp20x_usb_power_driver);

	MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
	MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
	MODULE_LICENSE("GPL");