![Javier Martinez Canillas](/assets/img/avatar_default.png)
If the driver is built as a module, I2C module alias information is not filled so the module won't be autoloaded. Export the I2C and OF devices ID to the module by using the MODULE_DEVICE_TABLE() macro. Before this patch: $ modinfo drivers/power/supply/max14656_charger_detector.ko | grep alias $ After this patch: $ modinfo drivers/power/supply/max14656_charger_detector.ko | grep alias alias: i2c:max14656 alias: of:N*T*Cmaxim,max14656C* alias: of:N*T*Cmaxim,max14656 Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
328 lines
8 KiB
C
328 lines
8 KiB
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;
|
|
}
|
|
|
|
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 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;
|
|
}
|
|
|
|
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");
|