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Release 4.11 drivers/power/supply/max14656_charger_detector.c

/*
 * 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)
 *
 * This package is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 */
#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; }

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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; }

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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; }

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#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); }

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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; }

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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; }

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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; }

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static enum power_supply_property max14656_battery_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER, };
static int max14656_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 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; INIT_DELAYED_WORK(&chip->irq_work, max14656_irq_worker); 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); 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; } schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000)); return 0; }

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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");

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