drivers/power/supply/max14656_charger_detector.c - linux/kernel/git/gregkh/usb - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Maxim MAX14656 / AL32 USB Charger Detector driver
  *
  * Copyright (C) 2014 LG Electronics, Inc
  * Copyright (C) 2016 Alexander Kurz <akurz@blala.de>
  *
  * Components from Maxim AL32 Charger detection Driver for MX50 Yoshi Board
  * Copyright (C) Amazon Technologies Inc. All rights reserved.
  * Manish Lachwani (lachwani@lab126.com)
  */
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
 #include <linux/of_device.h>
 #include <linux/workqueue.h>
 #include <linux/power_supply.h>

 #define MAX14656_MANUFACTURER	"Maxim Integrated"
 #define MAX14656_NAME		"max14656"

 #define MAX14656_DEVICE_ID	0x00
 #define MAX14656_INTERRUPT_1	0x01
 #define MAX14656_INTERRUPT_2	0x02
 #define MAX14656_STATUS_1	0x03
 #define MAX14656_STATUS_2	0x04
 #define MAX14656_INTMASK_1	0x05
 #define MAX14656_INTMASK_2	0x06
 #define MAX14656_CONTROL_1	0x07
 #define MAX14656_CONTROL_2	0x08
 #define MAX14656_CONTROL_3	0x09

 #define DEVICE_VENDOR_MASK	0xf0
 #define DEVICE_REV_MASK		0x0f
 #define INT_EN_REG_MASK		BIT(4)
 #define CHG_TYPE_INT_MASK	BIT(0)
 #define STATUS1_VB_VALID_MASK	BIT(4)
 #define STATUS1_CHG_TYPE_MASK	0xf
 #define INT1_DCD_TIMEOUT_MASK	BIT(7)
 #define CONTROL1_DEFAULT	0x0d
 #define CONTROL1_INT_EN		BIT(4)
 #define CONTROL1_INT_ACTIVE_HIGH	BIT(5)
 #define CONTROL1_EDGE		BIT(7)
 #define CONTROL2_DEFAULT	0x8e
 #define CONTROL2_ADC_EN		BIT(0)
 #define CONTROL3_DEFAULT	0x8d

 enum max14656_chg_type {
 	MAX14656_NO_CHARGER	= 0,
 	MAX14656_SDP_CHARGER,
 	MAX14656_CDP_CHARGER,
 	MAX14656_DCP_CHARGER,
 	MAX14656_APPLE_500MA_CHARGER,
 	MAX14656_APPLE_1A_CHARGER,
 	MAX14656_APPLE_2A_CHARGER,
 	MAX14656_SPECIAL_500MA_CHARGER,
 	MAX14656_APPLE_12W,
 	MAX14656_CHARGER_LAST
 };

 static const struct max14656_chg_type_props {
 	enum power_supply_type type;
 } chg_type_props[] = {
 	{ POWER_SUPPLY_TYPE_UNKNOWN },
 	{ POWER_SUPPLY_TYPE_USB },
 	{ POWER_SUPPLY_TYPE_USB_CDP },
 	{ POWER_SUPPLY_TYPE_USB_DCP },
 	{ POWER_SUPPLY_TYPE_USB_DCP },
 	{ POWER_SUPPLY_TYPE_USB_DCP },
 	{ POWER_SUPPLY_TYPE_USB_DCP },
 	{ POWER_SUPPLY_TYPE_USB_DCP },
 	{ POWER_SUPPLY_TYPE_USB },
 };

 struct max14656_chip {
 	struct i2c_client	*client;
 	struct power_supply	*detect_psy;
 	struct power_supply_desc psy_desc;
 	struct delayed_work	irq_work;

 	int irq;
 	int online;
 };

 static int max14656_read_reg(struct i2c_client *client, int reg, u8 *val)
 {
 	s32 ret;

 	ret = i2c_smbus_read_byte_data(client, reg);
 	if (ret < 0) {
 		dev_err(&client->dev,
 			"i2c read fail: can't read from %02x: %d\n",
 			reg, ret);
 		return ret;
 	}
 	*val = ret;
 	return 0;
 }

 static int max14656_write_reg(struct i2c_client *client, int reg, u8 val)
 {
 	s32 ret;

 	ret = i2c_smbus_write_byte_data(client, reg, val);
 	if (ret < 0) {
 		dev_err(&client->dev,
 			"i2c write fail: can't write %02x to %02x: %d\n",
 			val, reg, ret);
 		return ret;
 	}
 	return 0;
 }

 static int max14656_read_block_reg(struct i2c_client *client, u8 reg,
 				  u8 length, u8 *val)
 {
 	int ret;

 	ret = i2c_smbus_read_i2c_block_data(client, reg, length, val);
 	if (ret < 0) {
 		dev_err(&client->dev, "failed to block read reg 0x%x: %d\n",
 				reg, ret);
 		return ret;
 	}

 	return 0;
 }

 #define        REG_TOTAL_NUM   5
 static void max14656_irq_worker(struct work_struct *work)
 {
 	struct max14656_chip *chip =
 		container_of(work, struct max14656_chip, irq_work.work);

 	u8 buf[REG_TOTAL_NUM];
 	u8 chg_type;
 	int ret = 0;

 	ret = max14656_read_block_reg(chip->client, MAX14656_DEVICE_ID,
 				      REG_TOTAL_NUM, buf);

 	if ((buf[MAX14656_STATUS_1] & STATUS1_VB_VALID_MASK) &&
 		(buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK)) {
 		chg_type = buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK;
 		if (chg_type < MAX14656_CHARGER_LAST)
 			chip->psy_desc.type = chg_type_props[chg_type].type;
 		else
 			chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
 		chip->online = 1;
 	} else {
 		chip->online = 0;
 		chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
 	}

 	power_supply_changed(chip->detect_psy);
 }

 static irqreturn_t max14656_irq(int irq, void *dev_id)
 {
 	struct max14656_chip *chip = dev_id;

 	schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(100));

 	return IRQ_HANDLED;
 }

 static int max14656_hw_init(struct max14656_chip *chip)
 {
 	uint8_t val = 0;
 	uint8_t rev;
 	struct i2c_client *client = chip->client;

 	if (max14656_read_reg(client, MAX14656_DEVICE_ID, &val))
 		return -ENODEV;

 	if ((val & DEVICE_VENDOR_MASK) != 0x20) {
 		dev_err(&client->dev, "wrong vendor ID %d\n",
 			((val & DEVICE_VENDOR_MASK) >> 4));
 		return -ENODEV;
 	}
 	rev = val & DEVICE_REV_MASK;

 	/* Turn on ADC_EN */
 	if (max14656_write_reg(client, MAX14656_CONTROL_2, CONTROL2_ADC_EN))
 		return -EINVAL;

 	/* turn on interrupts and low power mode */
 	if (max14656_write_reg(client, MAX14656_CONTROL_1,
 		CONTROL1_DEFAULT |
 		CONTROL1_INT_EN |
 		CONTROL1_INT_ACTIVE_HIGH |
 		CONTROL1_EDGE))
 		return -EINVAL;

 	if (max14656_write_reg(client, MAX14656_INTMASK_1, 0x3))
 		return -EINVAL;

 	if (max14656_write_reg(client, MAX14656_INTMASK_2, 0x1))
 		return -EINVAL;

 	dev_info(&client->dev, "detected revision %d\n", rev);
 	return 0;
 }

 static int max14656_get_property(struct power_supply *psy,
 			    enum power_supply_property psp,
 			    union power_supply_propval *val)
 {
 	struct max14656_chip *chip = power_supply_get_drvdata(psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = chip->online;
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = MAX14656_NAME;
 		break;
 	case POWER_SUPPLY_PROP_MANUFACTURER:
 		val->strval = MAX14656_MANUFACTURER;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static enum power_supply_property max14656_battery_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER,
 };

 static void stop_irq_work(void *data)
 {
 	struct max14656_chip *chip = data;

 	cancel_delayed_work_sync(&chip->irq_work);
 }


 static int max14656_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
 	struct i2c_adapter *adapter = client->adapter;
 	struct device *dev = &client->dev;
 	struct power_supply_config psy_cfg = {};
 	struct max14656_chip *chip;
 	int irq = client->irq;
 	int ret = 0;

 	if (irq <= 0) {
 		dev_err(dev, "invalid irq number: %d\n", irq);
 		return -ENODEV;
 	}

 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 		dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
 		return -ENODEV;
 	}

 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	psy_cfg.drv_data = chip;
 	chip->client = client;
 	chip->online = 0;
 	chip->psy_desc.name = MAX14656_NAME;
 	chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
 	chip->psy_desc.properties = max14656_battery_props;
 	chip->psy_desc.num_properties = ARRAY_SIZE(max14656_battery_props);
 	chip->psy_desc.get_property = max14656_get_property;
 	chip->irq = irq;

 	ret = max14656_hw_init(chip);
 	if (ret)
 		return -ENODEV;

 	chip->detect_psy = devm_power_supply_register(dev,
 		       &chip->psy_desc, &psy_cfg);
 	if (IS_ERR(chip->detect_psy)) {
 		dev_err(dev, "power_supply_register failed\n");
 		return -EINVAL;
 	}

 	INIT_DELAYED_WORK(&chip->irq_work, max14656_irq_worker);
 	ret = devm_add_action(dev, stop_irq_work, chip);
 	if (ret) {
 		dev_err(dev, "devm_add_action %d failed\n", ret);
 		return ret;
 	}

 	ret = devm_request_irq(dev, chip->irq, max14656_irq,
 			       IRQF_TRIGGER_FALLING,
 			       MAX14656_NAME, chip);
 	if (ret) {
 		dev_err(dev, "request_irq %d failed\n", chip->irq);
 		return -EINVAL;
 	}
 	enable_irq_wake(chip->irq);

 	schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000));

 	return 0;
 }

 static const struct i2c_device_id max14656_id[] = {
 	{ "max14656", 0 },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, max14656_id);

 static const struct of_device_id max14656_match_table[] = {
 	{ .compatible = "maxim,max14656", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, max14656_match_table);

 static struct i2c_driver max14656_i2c_driver = {
 	.driver = {
 		.name	= "max14656",
 		.of_match_table = max14656_match_table,
 	},
 	.probe		= max14656_probe,
 	.id_table	= max14656_id,
 };
 module_i2c_driver(max14656_i2c_driver);

 MODULE_DESCRIPTION("MAX14656 USB charger detector");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Maxim MAX14656 / AL32 USB Charger Detector driver
	*
	* Copyright (C) 2014 LG Electronics, Inc
	* Copyright (C) 2016 Alexander Kurz <akurz@blala.de>
	*
	* Components from Maxim AL32 Charger detection Driver for MX50 Yoshi Board
	* Copyright (C) Amazon Technologies Inc. All rights reserved.
	* Manish Lachwani (lachwani@lab126.com)
	*/
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/gpio.h>
	#include <linux/of_gpio.h>
	#include <linux/of_device.h>
	#include <linux/workqueue.h>
	#include <linux/power_supply.h>

	#define MAX14656_MANUFACTURER "Maxim Integrated"
	#define MAX14656_NAME "max14656"

	#define MAX14656_DEVICE_ID 0x00
	#define MAX14656_INTERRUPT_1 0x01
	#define MAX14656_INTERRUPT_2 0x02
	#define MAX14656_STATUS_1 0x03
	#define MAX14656_STATUS_2 0x04
	#define MAX14656_INTMASK_1 0x05
	#define MAX14656_INTMASK_2 0x06
	#define MAX14656_CONTROL_1 0x07
	#define MAX14656_CONTROL_2 0x08
	#define MAX14656_CONTROL_3 0x09

	#define DEVICE_VENDOR_MASK 0xf0
	#define DEVICE_REV_MASK 0x0f
	#define INT_EN_REG_MASK BIT(4)
	#define CHG_TYPE_INT_MASK BIT(0)
	#define STATUS1_VB_VALID_MASK BIT(4)
	#define STATUS1_CHG_TYPE_MASK 0xf
	#define INT1_DCD_TIMEOUT_MASK BIT(7)
	#define CONTROL1_DEFAULT 0x0d
	#define CONTROL1_INT_EN BIT(4)
	#define CONTROL1_INT_ACTIVE_HIGH BIT(5)
	#define CONTROL1_EDGE BIT(7)
	#define CONTROL2_DEFAULT 0x8e
	#define CONTROL2_ADC_EN BIT(0)
	#define CONTROL3_DEFAULT 0x8d

	enum max14656_chg_type {
	MAX14656_NO_CHARGER = 0,
	MAX14656_SDP_CHARGER,
	MAX14656_CDP_CHARGER,
	MAX14656_DCP_CHARGER,
	MAX14656_APPLE_500MA_CHARGER,
	MAX14656_APPLE_1A_CHARGER,
	MAX14656_APPLE_2A_CHARGER,
	MAX14656_SPECIAL_500MA_CHARGER,
	MAX14656_APPLE_12W,
	MAX14656_CHARGER_LAST
	};

	static const struct max14656_chg_type_props {
	enum power_supply_type type;
	} chg_type_props[] = {
	{ POWER_SUPPLY_TYPE_UNKNOWN },
	{ POWER_SUPPLY_TYPE_USB },
	{ POWER_SUPPLY_TYPE_USB_CDP },
	{ POWER_SUPPLY_TYPE_USB_DCP },
	{ POWER_SUPPLY_TYPE_USB_DCP },
	{ POWER_SUPPLY_TYPE_USB_DCP },
	{ POWER_SUPPLY_TYPE_USB_DCP },
	{ POWER_SUPPLY_TYPE_USB_DCP },
	{ POWER_SUPPLY_TYPE_USB },
	};

	struct max14656_chip {
	struct i2c_client *client;
	struct power_supply *detect_psy;
	struct power_supply_desc psy_desc;
	struct delayed_work irq_work;

	int irq;
	int online;
	};

	static int max14656_read_reg(struct i2c_client client, int reg, u8 val)
	{
	s32 ret;

	ret = i2c_smbus_read_byte_data(client, reg);
	if (ret < 0) {
	dev_err(&client->dev,
	"i2c read fail: can't read from %02x: %d\n",
	reg, ret);
	return ret;
	}
	*val = ret;
	return 0;
	}

	static int max14656_write_reg(struct i2c_client *client, int reg, u8 val)
	{
	s32 ret;

	ret = i2c_smbus_write_byte_data(client, reg, val);
	if (ret < 0) {
	dev_err(&client->dev,
	"i2c write fail: can't write %02x to %02x: %d\n",
	val, reg, ret);
	return ret;
	}
	return 0;
	}

	static int max14656_read_block_reg(struct i2c_client *client, u8 reg,
	u8 length, u8 *val)
	{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(client, reg, length, val);
	if (ret < 0) {
	dev_err(&client->dev, "failed to block read reg 0x%x: %d\n",
	reg, ret);
	return ret;
	}

	return 0;
	}

	#define REG_TOTAL_NUM 5
	static void max14656_irq_worker(struct work_struct *work)
	{
	struct max14656_chip *chip =
	container_of(work, struct max14656_chip, irq_work.work);

	u8 buf[REG_TOTAL_NUM];
	u8 chg_type;
	int ret = 0;

	ret = max14656_read_block_reg(chip->client, MAX14656_DEVICE_ID,
	REG_TOTAL_NUM, buf);

	if ((buf[MAX14656_STATUS_1] & STATUS1_VB_VALID_MASK) &&
	(buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK)) {
	chg_type = buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK;
	if (chg_type < MAX14656_CHARGER_LAST)
	chip->psy_desc.type = chg_type_props[chg_type].type;
	else
	chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
	chip->online = 1;
	} else {
	chip->online = 0;
	chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
	}

	power_supply_changed(chip->detect_psy);
	}

	static irqreturn_t max14656_irq(int irq, void *dev_id)
	{
	struct max14656_chip *chip = dev_id;

	schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(100));

	return IRQ_HANDLED;
	}

	static int max14656_hw_init(struct max14656_chip *chip)
	{
	uint8_t val = 0;
	uint8_t rev;
	struct i2c_client *client = chip->client;

	if (max14656_read_reg(client, MAX14656_DEVICE_ID, &val))
	return -ENODEV;

	if ((val & DEVICE_VENDOR_MASK) != 0x20) {
	dev_err(&client->dev, "wrong vendor ID %d\n",
	((val & DEVICE_VENDOR_MASK) >> 4));
	return -ENODEV;
	}
	rev = val & DEVICE_REV_MASK;

	/* Turn on ADC_EN */
	if (max14656_write_reg(client, MAX14656_CONTROL_2, CONTROL2_ADC_EN))
	return -EINVAL;

	/* turn on interrupts and low power mode */
	if (max14656_write_reg(client, MAX14656_CONTROL_1,
	CONTROL1_DEFAULT \|
	CONTROL1_INT_EN \|
	CONTROL1_INT_ACTIVE_HIGH \|
	CONTROL1_EDGE))
	return -EINVAL;

	if (max14656_write_reg(client, MAX14656_INTMASK_1, 0x3))
	return -EINVAL;

	if (max14656_write_reg(client, MAX14656_INTMASK_2, 0x1))
	return -EINVAL;

	dev_info(&client->dev, "detected revision %d\n", rev);
	return 0;
	}

	static int max14656_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct max14656_chip *chip = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = chip->online;
	break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
	val->strval = MAX14656_NAME;
	break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
	val->strval = MAX14656_MANUFACTURER;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static enum power_supply_property max14656_battery_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
	};

	static void stop_irq_work(void *data)
	{
	struct max14656_chip *chip = data;

	cancel_delayed_work_sync(&chip->irq_work);
	}


	static int max14656_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct i2c_adapter *adapter = client->adapter;
	struct device *dev = &client->dev;
	struct power_supply_config psy_cfg = {};
	struct max14656_chip *chip;
	int irq = client->irq;
	int ret = 0;

	if (irq <= 0) {
	dev_err(dev, "invalid irq number: %d\n", irq);
	return -ENODEV;
	}

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
	dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
	return -ENODEV;
	}

	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	psy_cfg.drv_data = chip;
	chip->client = client;
	chip->online = 0;
	chip->psy_desc.name = MAX14656_NAME;
	chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
	chip->psy_desc.properties = max14656_battery_props;
	chip->psy_desc.num_properties = ARRAY_SIZE(max14656_battery_props);
	chip->psy_desc.get_property = max14656_get_property;
	chip->irq = irq;

	ret = max14656_hw_init(chip);
	if (ret)
	return -ENODEV;

	chip->detect_psy = devm_power_supply_register(dev,
	&chip->psy_desc, &psy_cfg);
	if (IS_ERR(chip->detect_psy)) {
	dev_err(dev, "power_supply_register failed\n");
	return -EINVAL;
	}

	INIT_DELAYED_WORK(&chip->irq_work, max14656_irq_worker);
	ret = devm_add_action(dev, stop_irq_work, chip);
	if (ret) {
	dev_err(dev, "devm_add_action %d failed\n", ret);
	return ret;
	}

	ret = devm_request_irq(dev, chip->irq, max14656_irq,
	IRQF_TRIGGER_FALLING,
	MAX14656_NAME, chip);
	if (ret) {
	dev_err(dev, "request_irq %d failed\n", chip->irq);
	return -EINVAL;
	}
	enable_irq_wake(chip->irq);

	schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000));

	return 0;
	}

	static const struct i2c_device_id max14656_id[] = {
	{ "max14656", 0 },
	{}
	};
	MODULE_DEVICE_TABLE(i2c, max14656_id);

	static const struct of_device_id max14656_match_table[] = {
	{ .compatible = "maxim,max14656", },
	{}
	};
	MODULE_DEVICE_TABLE(of, max14656_match_table);

	static struct i2c_driver max14656_i2c_driver = {
	.driver = {
	.name = "max14656",
	.of_match_table = max14656_match_table,
	},
	.probe = max14656_probe,
	.id_table = max14656_id,
	};
	module_i2c_driver(max14656_i2c_driver);

	MODULE_DESCRIPTION("MAX14656 USB charger detector");
	MODULE_LICENSE("GPL v2");