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power_supply: Add charger driver for MAX8998/LP3974

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This patch supports power supply APIs for MAX8998/LP3974.

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: KyungMin Park <kyungmin.park@samsung.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Donggeun Kim 2011-06-24 19:04:18 +09:00 committed by Anton Vorontsov
parent 149c077b4b
commit bb4ce97087
5 changed files with 240 additions and 0 deletions
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2
drivers/mfd/max8998.c
View file

@ -39,6 +39,8 @@ static struct mfd_cell max8998_devs[] = {
.name = "max8998-pmic",
}, {
.name = "max8998-rtc",
}, {
.name = "max8998-battery",
},
};

7
drivers/power/Kconfig
View file

@ -235,4 +235,11 @@ config CHARGER_MAX8997
Say Y to enable support for the battery charger control sysfs and
platform data of MAX8997/LP3974 PMICs.
config CHARGER_MAX8998
tristate "Maxim MAX8998/LP3974 PMIC battery charger driver"
depends on MFD_MAX8998 && REGULATOR_MAX8998
help
Say Y to enable support for the battery charger control sysfs and
platform data of MAX8998/LP3974 PMICs.
endif # POWER_SUPPLY

1
drivers/power/Makefile
View file

@ -36,3 +36,4 @@ obj-$(CONFIG_CHARGER_MAX8903) += max8903_charger.o
obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o

218
drivers/power/max8998_charger.c Normal file
View file

@ -0,0 +1,218 @@
/*
* max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974
*
* Copyright (C) 2009-2010 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>
struct max8998_battery_data {
struct device *dev;
struct max8998_dev *iodev;
struct power_supply battery;
};
static enum power_supply_property max8998_battery_props[] = {
POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
};
/* Note that the charger control is done by a current regulator "CHARGER" */
static int max8998_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max8998_battery_data *max8998 = container_of(psy,
struct max8998_battery_data, battery);
struct i2c_client *i2c = max8998->iodev->i2c;
int ret;
u8 reg;
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
if (ret)
return ret;
if (reg & (1 << 4))
val->intval = 0;
else
val->intval = 1;
break;
case POWER_SUPPLY_PROP_ONLINE:
ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
if (ret)
return ret;
if (reg & (1 << 3))
val->intval = 0;
else
val->intval = 1;
break;
default:
return -EINVAL;
}
return 0;
}
static __devinit int max8998_battery_probe(struct platform_device *pdev)
{
struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
struct max8998_battery_data *max8998;
struct i2c_client *i2c;
int ret = 0;
if (!pdata) {
dev_err(pdev->dev.parent, "No platform init data supplied\n");
return -ENODEV;
}
max8998 = kzalloc(sizeof(struct max8998_battery_data), GFP_KERNEL);
if (!max8998)
return -ENOMEM;
max8998->dev = &pdev->dev;
max8998->iodev = iodev;
platform_set_drvdata(pdev, max8998);
i2c = max8998->iodev->i2c;
/* Setup "End of Charge" */
/* If EOC value equals 0,
* remain value set from bootloader or default value */
if (pdata->eoc >= 10 && pdata->eoc <= 45) {
max8998_update_reg(i2c, MAX8998_REG_CHGR1,
(pdata->eoc / 5 - 2) << 5, 0x7 << 5);
} else if (pdata->eoc == 0) {
dev_dbg(max8998->dev,
"EOC value not set: leave it unchanged.\n");
} else {
dev_err(max8998->dev, "Invalid EOC value\n");
ret = -EINVAL;
goto err;
}
/* Setup Charge Restart Level */
switch (pdata->restart) {
case 100:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
break;
case 150:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
break;
case 200:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
break;
case -1:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
break;
case 0:
dev_dbg(max8998->dev,
"Restart Level not set: leave it unchanged.\n");
break;
default:
dev_err(max8998->dev, "Invalid Restart Level\n");
ret = -EINVAL;
goto err;
}
/* Setup Charge Full Timeout */
switch (pdata->timeout) {
case 5:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
break;
case 6:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
break;
case 7:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
break;
case -1:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
break;
case 0:
dev_dbg(max8998->dev,
"Full Timeout not set: leave it unchanged.\n");
default:
dev_err(max8998->dev, "Invalid Full Timeout value\n");
ret = -EINVAL;
goto err;
}
max8998->battery.name = "max8998_pmic";
max8998->battery.type = POWER_SUPPLY_TYPE_BATTERY;
max8998->battery.get_property = max8998_battery_get_property;
max8998->battery.properties = max8998_battery_props;
max8998->battery.num_properties = ARRAY_SIZE(max8998_battery_props);
ret = power_supply_register(max8998->dev, &max8998->battery);
if (ret) {
dev_err(max8998->dev, "failed: power supply register\n");
goto err;
}
return 0;
err:
kfree(max8998);
return ret;
}
static int __devexit max8998_battery_remove(struct platform_device *pdev)
{
struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
power_supply_unregister(&max8998->battery);
kfree(max8998);
return 0;
}
static const struct platform_device_id max8998_battery_id[] = {
{ "max8998-battery", TYPE_MAX8998 },
};
static struct platform_driver max8998_battery_driver = {
.driver = {
.name = "max8998-battery",
.owner = THIS_MODULE,
},
.probe = max8998_battery_probe,
.remove = __devexit_p(max8998_battery_remove),
.id_table = max8998_battery_id,
};
static int __init max8998_battery_init(void)
{
return platform_driver_register(&max8998_battery_driver);
}
module_init(max8998_battery_init);
static void __exit max8998_battery_cleanup(void)
{
platform_driver_unregister(&max8998_battery_driver);
}
module_exit(max8998_battery_cleanup);
MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max8998-battery");

12
include/linux/mfd/max8998.h
View file

@ -87,6 +87,15 @@ struct max8998_regulator_data {
* @wakeup: Allow to wake up from suspend
* @rtc_delay: LP3974 RTC chip bug that requires delay after a register
* write before reading it.
* @eoc: End of Charge Level in percent: 10% ~ 45% by 5% step
* If it equals 0, leave it unchanged.
* Otherwise, it is a invalid value.
* @restart: Restart Level in mV: 100, 150, 200, and -1 for disable.
* If it equals 0, leave it unchanged.
* Otherwise, it is a invalid value.
* @timeout: Full Timeout in hours: 5, 6, 7, and -1 for disable.
* If it equals 0, leave it unchanged.
* Otherwise, leave it unchanged.
*/
struct max8998_platform_data {
struct max8998_regulator_data *regulators;
@ -107,6 +116,9 @@ struct max8998_platform_data {
int buck2_default_idx;
bool wakeup;
bool rtc_delay;
int eoc;
int restart;
int timeout;
};
#endif /* __LINUX_MFD_MAX8998_H */