[linux-2.6-block.git] / drivers / power / supply / axp20x_usb_power.c

/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under  the terms of the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the License, or (at your
 * option) any later version.
 */

#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>

#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_VBUC_CLIMIT_900mA	0
#define AXP20X_VBUC_CLIMIT_500mA	1
#define AXP20X_VBUC_CLIMIT_100mA	2
#define AXP20X_VBUC_CLIMIT_NONE		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)

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;
};

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 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:
		ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
		if (ret)
			return ret;

		switch (v & AXP20X_VBUS_CLIMIT_MASK) {
		case AXP20X_VBUC_CLIMIT_100mA:
			if (power->axp20x_id == AXP221_ID)
				val->intval = -1; /* No 100mA limit */
			else
				val->intval = 100000;
			break;
		case AXP20X_VBUC_CLIMIT_500mA:
			val->intval = 500000;
			break;
		case AXP20X_VBUC_CLIMIT_900mA:
			val->intval = 900000;
			break;
		case AXP20X_VBUC_CLIMIT_NONE:
			val->intval = -1;
			break;
		}
		return 0;
	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 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;
	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:
		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;

	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) {
		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);
	}

	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,
	}, { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);

static struct platform_driver axp20x_usb_power_driver = {
	.probe = axp20x_usb_power_probe,
	.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");
Commit	Line	Data
69fb4dca HG	1	/*
	2	* AXP20x PMIC USB power supply status driver
	3	*
	4	* Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
	5	* Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*/
	12
	13	#include <linux/device.h>
	14	#include <linux/init.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/kernel.h>
	17	#include <linux/mfd/axp20x.h>
	18	#include <linux/module.h>
	19	#include <linux/of.h>
0dcc70ca	20	#include <linux/of_device.h>
69fb4dca HG	21	#include <linux/platform_device.h>
	22	#include <linux/power_supply.h>
	23	#include <linux/regmap.h>
	24	#include <linux/slab.h>
33863c93	25	#include <linux/iio/consumer.h>
69fb4dca HG	26
	27	#define DRVNAME "axp20x-usb-power-supply"
	28
	29	#define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
	30	#define AXP20X_PWR_STATUS_VBUS_USED BIT(4)
	31
	32	#define AXP20X_USB_STATUS_VBUS_VALID BIT(2)
	33
	34	#define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
5c3ff59b QS	35	#define AXP20X_VBUS_VHOLD_MASK GENMASK(5, 3)
5c3ff59b QS	36	#define AXP20X_VBUS_VHOLD_OFFSET 3
69fb4dca HG	37	#define AXP20X_VBUS_CLIMIT_MASK 3
	38	#define AXP20X_VBUC_CLIMIT_900mA 0
	39	#define AXP20X_VBUC_CLIMIT_500mA 1
	40	#define AXP20X_VBUC_CLIMIT_100mA 2
	41	#define AXP20X_VBUC_CLIMIT_NONE 3
	42
	43	#define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
	44	#define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)
	45
	46	#define AXP20X_VBUS_MON_VBUS_VALID BIT(3)
	47
	48	struct axp20x_usb_power {
cecbf8d5	49	struct device_node *np;
69fb4dca HG	50	struct regmap *regmap;
69fb4dca HG	51	struct power_supply *supply;
15df6d98	52	enum axp20x_variants axp20x_id;
33863c93 QS	53	struct iio_channel *vbus_v;
33863c93 QS	54	struct iio_channel *vbus_i;
69fb4dca HG	55	};
	56
	57	static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
	58	{
	59	struct axp20x_usb_power *power = devid;
	60
	61	power_supply_changed(power->supply);
	62
	63	return IRQ_HANDLED;
	64	}
	65
	66	static int axp20x_usb_power_get_property(struct power_supply *psy,
	67	enum power_supply_property psp, union power_supply_propval *val)
	68	{
	69	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
	70	unsigned int input, v;
	71	int ret;
	72
	73	switch (psp) {
	74	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	75	ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
	76	if (ret)
	77	return ret;
	78
	79	val->intval = AXP20X_VBUS_VHOLD_uV(v);
	80	return 0;
	81	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
33863c93 QS	82	if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
	83	ret = iio_read_channel_processed(power->vbus_v,
	84	&val->intval);
	85	if (ret)
	86	return ret;
	87
	88	/*
	89	* IIO framework gives mV but Power Supply framework
	90	* gives uV.
	91	*/
	92	val->intval *= 1000;
	93	return 0;
	94	}
	95
69fb4dca HG	96	ret = axp20x_read_variable_width(power->regmap,
	97	AXP20X_VBUS_V_ADC_H, 12);
	98	if (ret < 0)
	99	return ret;
	100
	101	val->intval = ret * 1700; /* 1 step = 1.7 mV */
	102	return 0;
	103	case POWER_SUPPLY_PROP_CURRENT_MAX:
	104	ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
	105	if (ret)
	106	return ret;
	107
	108	switch (v & AXP20X_VBUS_CLIMIT_MASK) {
	109	case AXP20X_VBUC_CLIMIT_100mA:
50111d3f	110	if (power->axp20x_id == AXP221_ID)
cecbf8d5	111	val->intval = -1; /* No 100mA limit */
50111d3f QS	112	else
50111d3f QS	113	val->intval = 100000;
69fb4dca HG	114	break;
	115	case AXP20X_VBUC_CLIMIT_500mA:
	116	val->intval = 500000;
	117	break;
	118	case AXP20X_VBUC_CLIMIT_900mA:
	119	val->intval = 900000;
	120	break;
	121	case AXP20X_VBUC_CLIMIT_NONE:
	122	val->intval = -1;
	123	break;
	124	}
	125	return 0;
	126	case POWER_SUPPLY_PROP_CURRENT_NOW:
33863c93 QS	127	if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
	128	ret = iio_read_channel_processed(power->vbus_i,
	129	&val->intval);
	130	if (ret)
	131	return ret;
	132
	133	/*
	134	* IIO framework gives mA but Power Supply framework
	135	* gives uA.
	136	*/
	137	val->intval *= 1000;
	138	return 0;
	139	}
	140
69fb4dca HG	141	ret = axp20x_read_variable_width(power->regmap,
	142	AXP20X_VBUS_I_ADC_H, 12);
	143	if (ret < 0)
	144	return ret;
	145
	146	val->intval = ret * 375; /* 1 step = 0.375 mA */
	147	return 0;
	148	default:
	149	break;
	150	}
	151
	152	/* All the properties below need the input-status reg value */
	153	ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
	154	if (ret)
	155	return ret;
	156
	157	switch (psp) {
	158	case POWER_SUPPLY_PROP_HEALTH:
	159	if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
	160	val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
	161	break;
	162	}
	163
cecbf8d5	164	val->intval = POWER_SUPPLY_HEALTH_GOOD;
69fb4dca	165
0dcc70ca	166	if (power->axp20x_id == AXP202_ID) {
cecbf8d5 HG	167	ret = regmap_read(power->regmap,
	168	AXP20X_USB_OTG_STATUS, &v);
	169	if (ret)
	170	return ret;
69fb4dca	171
cecbf8d5 HG	172	if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
	173	val->intval =
	174	POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	175	}
69fb4dca HG	176	break;
	177	case POWER_SUPPLY_PROP_PRESENT:
	178	val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
	179	break;
	180	case POWER_SUPPLY_PROP_ONLINE:
	181	val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
	182	break;
	183	default:
	184	return -EINVAL;
	185	}
	186
	187	return 0;
	188	}
	189
5c3ff59b QS	190	static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
	191	int intval)
	192	{
	193	int val;
	194
	195	switch (intval) {
	196	case 4000000:
	197	case 4100000:
	198	case 4200000:
	199	case 4300000:
	200	case 4400000:
	201	case 4500000:
	202	case 4600000:
	203	case 4700000:
	204	val = (intval - 4000000) / 100000;
	205	return regmap_update_bits(power->regmap,
	206	AXP20X_VBUS_IPSOUT_MGMT,
	207	AXP20X_VBUS_VHOLD_MASK,
	208	val << AXP20X_VBUS_VHOLD_OFFSET);
	209	default:
	210	return -EINVAL;
	211	}
	212
	213	return -EINVAL;
	214	}
	215
	216	static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
	217	int intval)
	218	{
	219	int val;
	220
	221	switch (intval) {
	222	case 100000:
	223	if (power->axp20x_id == AXP221_ID)
	224	return -EINVAL;
	225	case 500000:
	226	case 900000:
	227	val = (900000 - intval) / 400000;
	228	return regmap_update_bits(power->regmap,
	229	AXP20X_VBUS_IPSOUT_MGMT,
	230	AXP20X_VBUS_CLIMIT_MASK, val);
	231	default:
	232	return -EINVAL;
	233	}
	234
	235	return -EINVAL;
	236	}
	237
	238	static int axp20x_usb_power_set_property(struct power_supply *psy,
	239	enum power_supply_property psp,
	240	const union power_supply_propval *val)
	241	{
	242	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
	243
	244	switch (psp) {
	245	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	246	return axp20x_usb_power_set_voltage_min(power, val->intval);
	247
	248	case POWER_SUPPLY_PROP_CURRENT_MAX:
	249	return axp20x_usb_power_set_current_max(power, val->intval);
	250
	251	default:
	252	return -EINVAL;
	253	}
254
255	return -EINVAL;
256	}
257
258	static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
259	enum power_supply_property psp)
260	{
261	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN \|\|
262	psp == POWER_SUPPLY_PROP_CURRENT_MAX;
263	}
264
69fb4dca HG	265	static enum power_supply_property axp20x_usb_power_properties[] = {
	266	POWER_SUPPLY_PROP_HEALTH,
	267	POWER_SUPPLY_PROP_PRESENT,
	268	POWER_SUPPLY_PROP_ONLINE,
	269	POWER_SUPPLY_PROP_VOLTAGE_MIN,
	270	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	271	POWER_SUPPLY_PROP_CURRENT_MAX,
	272	POWER_SUPPLY_PROP_CURRENT_NOW,
	273	};
	274
cecbf8d5 HG	275	static enum power_supply_property axp22x_usb_power_properties[] = {
	276	POWER_SUPPLY_PROP_HEALTH,
	277	POWER_SUPPLY_PROP_PRESENT,
	278	POWER_SUPPLY_PROP_ONLINE,
	279	POWER_SUPPLY_PROP_VOLTAGE_MIN,
	280	POWER_SUPPLY_PROP_CURRENT_MAX,
	281	};
	282
69fb4dca HG	283	static const struct power_supply_desc axp20x_usb_power_desc = {
	284	.name = "axp20x-usb",
	285	.type = POWER_SUPPLY_TYPE_USB,
	286	.properties = axp20x_usb_power_properties,
	287	.num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
5c3ff59b	288	.property_is_writeable = axp20x_usb_power_prop_writeable,
69fb4dca	289	.get_property = axp20x_usb_power_get_property,
5c3ff59b	290	.set_property = axp20x_usb_power_set_property,
69fb4dca HG	291	};
69fb4dca HG	292
cecbf8d5 HG	293	static const struct power_supply_desc axp22x_usb_power_desc = {
	294	.name = "axp20x-usb",
	295	.type = POWER_SUPPLY_TYPE_USB,
	296	.properties = axp22x_usb_power_properties,
	297	.num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
5c3ff59b	298	.property_is_writeable = axp20x_usb_power_prop_writeable,
cecbf8d5	299	.get_property = axp20x_usb_power_get_property,
5c3ff59b	300	.set_property = axp20x_usb_power_set_property,
cecbf8d5 HG	301	};
cecbf8d5 HG	302
33863c93 QS	303	static int configure_iio_channels(struct platform_device *pdev,
	304	struct axp20x_usb_power *power)
	305	{
	306	power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
	307	if (IS_ERR(power->vbus_v)) {
	308	if (PTR_ERR(power->vbus_v) == -ENODEV)
	309	return -EPROBE_DEFER;
	310	return PTR_ERR(power->vbus_v);
	311	}
	312
	313	power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
	314	if (IS_ERR(power->vbus_i)) {
	315	if (PTR_ERR(power->vbus_i) == -ENODEV)
	316	return -EPROBE_DEFER;
	317	return PTR_ERR(power->vbus_i);
	318	}
	319
	320	return 0;
	321	}
	322
	323	static int configure_adc_registers(struct axp20x_usb_power *power)
	324	{
	325	/* Enable vbus voltage and current measurement */
	326	return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
	327	AXP20X_ADC_EN1_VBUS_CURR \|
	328	AXP20X_ADC_EN1_VBUS_VOLT,
	329	AXP20X_ADC_EN1_VBUS_CURR \|
	330	AXP20X_ADC_EN1_VBUS_VOLT);
	331	}
	332
69fb4dca HG	333	static int axp20x_usb_power_probe(struct platform_device *pdev)
	334	{
	335	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
	336	struct power_supply_config psy_cfg = {};
	337	struct axp20x_usb_power *power;
cecbf8d5 HG	338	static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
	339	"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
	340	static const char * const axp22x_irq_names[] = {
	341	"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
a4631820	342	const char * const *irq_names;
cecbf8d5	343	const struct power_supply_desc *usb_power_desc;
69fb4dca HG	344	int i, irq, ret;
	345
	346	if (!of_device_is_available(pdev->dev.of_node))
	347	return -ENODEV;
	348
	349	if (!axp20x) {
	350	dev_err(&pdev->dev, "Parent drvdata not set\n");
	351	return -EINVAL;
	352	}
	353
	354	power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
	355	if (!power)
	356	return -ENOMEM;
	357
15df6d98 MS	358	power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
15df6d98 MS	359	&pdev->dev);
0dcc70ca	360
cecbf8d5	361	power->np = pdev->dev.of_node;
69fb4dca HG	362	power->regmap = axp20x->regmap;
69fb4dca HG	363
0dcc70ca	364	if (power->axp20x_id == AXP202_ID) {
cecbf8d5 HG	365	/* Enable vbus valid checking */
	366	ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
	367	AXP20X_VBUS_MON_VBUS_VALID,
	368	AXP20X_VBUS_MON_VBUS_VALID);
	369	if (ret)
	370	return ret;
69fb4dca	371
33863c93 QS	372	if (IS_ENABLED(CONFIG_AXP20X_ADC))
	373	ret = configure_iio_channels(pdev, power);
	374	else
	375	ret = configure_adc_registers(power);
	376
cecbf8d5 HG	377	if (ret)
	378	return ret;
	379
	380	usb_power_desc = &axp20x_usb_power_desc;
	381	irq_names = axp20x_irq_names;
50111d3f QS	382	} else if (power->axp20x_id == AXP221_ID \|\|
50111d3f QS	383	power->axp20x_id == AXP223_ID) {
cecbf8d5 HG	384	usb_power_desc = &axp22x_usb_power_desc;
	385	irq_names = axp22x_irq_names;
	386	} else {
	387	dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
	388	axp20x->variant);
	389	return -EINVAL;
	390	}
69fb4dca HG	391
	392	psy_cfg.of_node = pdev->dev.of_node;
	393	psy_cfg.drv_data = power;
	394
cecbf8d5 HG	395	power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
cecbf8d5 HG	396	&psy_cfg);
69fb4dca HG	397	if (IS_ERR(power->supply))
	398	return PTR_ERR(power->supply);
	399
	400	/* Request irqs after registering, as irqs may trigger immediately */
cecbf8d5	401	for (i = 0; irq_names[i]; i++) {
69fb4dca HG	402	irq = platform_get_irq_byname(pdev, irq_names[i]);
	403	if (irq < 0) {
	404	dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
	405	irq_names[i], irq);
	406	continue;
	407	}
	408	irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
	409	ret = devm_request_any_context_irq(&pdev->dev, irq,
	410	axp20x_usb_power_irq, 0, DRVNAME, power);
	411	if (ret < 0)
	412	dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
	413	irq_names[i], ret);
	414	}
	415
	416	return 0;
	417	}
	418
	419	static const struct of_device_id axp20x_usb_power_match[] = {
0dcc70ca QS	420	{
	421	.compatible = "x-powers,axp202-usb-power-supply",
	422	.data = (void *)AXP202_ID,
	423	}, {
	424	.compatible = "x-powers,axp221-usb-power-supply",
	425	.data = (void *)AXP221_ID,
50111d3f QS	426	}, {
	427	.compatible = "x-powers,axp223-usb-power-supply",
	428	.data = (void *)AXP223_ID,
0dcc70ca	429	}, { /* sentinel */ }
69fb4dca HG	430	};
	431	MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
	432
	433	static struct platform_driver axp20x_usb_power_driver = {
	434	.probe = axp20x_usb_power_probe,
	435	.driver = {
	436	.name = DRVNAME,
	437	.of_match_table = axp20x_usb_power_match,
	438	},
	439	};
	440
	441	module_platform_driver(axp20x_usb_power_driver);
	442
	443	MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
	444	MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
	445	MODULE_LICENSE("GPL");