drivers/power/axp20x_usb_power.c - kernel/quantenna - Git at Google

 /*
  * 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/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/regmap.h>
 #include <linux/slab.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_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 regmap *regmap;
 	struct power_supply *supply;
 };

 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:
 		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:
 			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:
 		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;
 		}

 		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;
 		}

 		val->intval = POWER_SUPPLY_HEALTH_GOOD;
 		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 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 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),
 	.get_property = axp20x_usb_power_get_property,
 };

 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 irq_names[] = { "VBUS_PLUGIN",
 		"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID" };
 	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->regmap = axp20x->regmap;

 	/* 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;

 	/* Enable vbus voltage and current measurement */
 	ret = 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);
 	if (ret)
 		return ret;

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

 	power->supply = devm_power_supply_register(&pdev->dev,
 					&axp20x_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; i < ARRAY_SIZE(irq_names); 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" },
 	{ }
 };
 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");
	/*
	* 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/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/regmap.h>
	#include <linux/slab.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_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 regmap *regmap;
	struct power_supply *supply;
	};

	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:
	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:
	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:
	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;
	}

	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;
	}

	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	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 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 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),
	.get_property = axp20x_usb_power_get_property,
	};

	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 irq_names[] = { "VBUS_PLUGIN",
	"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID" };
	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->regmap = axp20x->regmap;

	/* 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;

	/* Enable vbus voltage and current measurement */
	ret = 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);
	if (ret)
	return ret;

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

	power->supply = devm_power_supply_register(&pdev->dev,
	&axp20x_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; i < ARRAY_SIZE(irq_names); 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" },
	{ }
	};
	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");