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/*
* Battery driver for Maxim MAX8907C
*
* Copyright (c) 2011, NVIDIA Corporation.
* Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8907c.h>
#include <linux/power/max8907c-charger.h>
#include <linux/slab.h>
struct max8907c_charger {
struct max8907c_charger_pdata *pdata;
struct max8907c *chip;
struct i2c_client *i2c;
int online;
};
static void max8907c_set_charger(struct max8907c_charger *charger)
{
struct max8907c_charger_pdata *pdata = charger->pdata;
int ret;
if (charger->online) {
ret = max8907c_reg_write(charger->i2c, MAX8907C_REG_CHG_CNTL1,
(pdata->topoff_threshold << 5) |
(pdata->restart_hysteresis << 3) |
(pdata->fast_charging_current));
if (unlikely(ret != 0))
pr_err("Failed to set CHG_CNTL1: %d\n", ret);
ret = max8907c_set_bits(charger->i2c, MAX8907C_REG_CHG_CNTL2,
0x30, pdata->fast_charger_time << 4);
if (unlikely(ret != 0))
pr_err("Failed to set CHG_CNTL2: %d\n", ret);
} else {
ret = max8907c_set_bits(charger->i2c, MAX8907C_REG_CHG_CNTL1, 0x80, 0x1);
if (unlikely(ret != 0))
pr_err("Failed to set CHG_CNTL1: %d\n", ret);
}
}
static irqreturn_t max8907c_charger_isr(int irq, void *dev_id)
{
struct max8907c_charger *charger = dev_id;
struct max8907c *chip = charger->chip;
switch (irq - chip->irq_base) {
case MAX8907C_IRQ_VCHG_DC_R:
charger->online = 1;
max8907c_set_charger(charger);
break;
case MAX8907C_IRQ_VCHG_DC_F:
charger->online = 0;
max8907c_set_charger(charger);
break;
}
return IRQ_HANDLED;
}
static int max8907c_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
const static int types[] = {
POWER_SUPPLY_CHARGE_TYPE_TRICKLE,
POWER_SUPPLY_CHARGE_TYPE_FAST,
POWER_SUPPLY_CHARGE_TYPE_FAST,
POWER_SUPPLY_CHARGE_TYPE_NONE,
};
int ret = -ENODEV;
int status;
struct max8907c_charger *charger = dev_get_drvdata(psy->dev->parent);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = charger->online;
ret = 0;
break;
case POWER_SUPPLY_PROP_STATUS:
/* Get charger status from CHG_EN_STAT */
status = max8907c_reg_read(charger->i2c, MAX8907C_REG_CHG_STAT);
val->intval = ((status & 0x10) == 0x10) ?
POWER_SUPPLY_STATUS_CHARGING :
POWER_SUPPLY_STATUS_NOT_CHARGING;
ret = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
/* Get charging type from CHG_MODE */
status = max8907c_reg_read(charger->i2c, MAX8907C_REG_CHG_STAT);
val->intval = types[(status & 0x0C) >> 2];
ret = 0;
break;
default:
val->intval = 0;
ret = -EINVAL;
break;
}
return ret;
}
static enum power_supply_property max8907c_charger_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
};
static struct power_supply max8907c_charger_ps = {
.name = "charger",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = max8907c_charger_props,
.num_properties = ARRAY_SIZE(max8907c_charger_props),
.get_property = max8907c_charger_get_property,
};
static __devinit int max8907c_charger_probe(struct platform_device *pdev)
{
struct max8907c_charger_pdata *pdata = pdev->dev.platform_data;
struct max8907c_charger *charger = 0;
struct max8907c *chip = dev_get_drvdata(pdev->dev.parent);
int ret;
charger = kzalloc(sizeof(*charger), GFP_KERNEL);
if (!charger)
return -ENOMEM;
charger->pdata = pdata;
charger->online = 0;
charger->chip = chip;
charger->i2c = chip->i2c_power;
platform_set_drvdata(pdev, charger);
ret = max8907c_reg_read(charger->i2c, MAX8907C_REG_CHG_STAT);
if (ret & (1 << 7)) {
charger->online = 1;
max8907c_set_charger(charger);
}
ret = request_threaded_irq(chip->irq_base + MAX8907C_IRQ_VCHG_DC_F, NULL,
max8907c_charger_isr, IRQF_ONESHOT,
"power-remove", charger);
if (unlikely(ret < 0)) {
pr_debug("max8907c: failed to request IRQ %X\n", ret);
goto out;
}
ret = request_threaded_irq(chip->irq_base + MAX8907C_IRQ_VCHG_DC_R, NULL,
max8907c_charger_isr, IRQF_ONESHOT,
"power-insert", charger);
if (unlikely(ret < 0)) {
pr_debug("max8907c: failed to request IRQ %X\n", ret);
goto out1;
}
ret = power_supply_register(&pdev->dev, &max8907c_charger_ps);
if (unlikely(ret != 0)) {
pr_err("Failed to register max8907c_charger driver: %d\n", ret);
goto out2;
}
return 0;
out2:
free_irq(chip->irq_base + MAX8907C_IRQ_VCHG_DC_R, charger);
out1:
free_irq(chip->irq_base + MAX8907C_IRQ_VCHG_DC_F, charger);
out:
kfree(charger);
return ret;
}
static __devexit int max8907c_charger_remove(struct platform_device *pdev)
{
struct max8907c_charger *charger = platform_get_drvdata(pdev);
struct max8907c *chip = charger->chip;
int ret;
ret = max8907c_reg_write(charger->i2c, MAX8907C_REG_CHG_IRQ1_MASK, 0xFF);
if (unlikely(ret != 0)) {
pr_err("Failed to set IRQ1_MASK: %d\n", ret);
goto out;
}
free_irq(chip->irq_base + MAX8907C_IRQ_VCHG_DC_R, charger);
free_irq(chip->irq_base + MAX8907C_IRQ_VCHG_DC_F, charger);
power_supply_unregister(&max8907c_charger_ps);
out:
kfree(charger);
return 0;
}
static struct platform_driver max8907c_charger_driver = {
.probe = max8907c_charger_probe,
.remove = __devexit_p(max8907c_charger_remove),
.driver = {
.name = "max8907c-charger",
},
};
static int __init max8907c_charger_init(void)
{
return platform_driver_register(&max8907c_charger_driver);
}
module_init(max8907c_charger_init);
static void __exit max8907c_charger_exit(void)
{
platform_driver_unregister(&max8907c_charger_driver);
}
module_exit(max8907c_charger_exit);
MODULE_DESCRIPTION("Charger driver for MAX8907C");
MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
MODULE_LICENSE("GPL");
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