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power_supply: Add charger driver for MAX8997/8966

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MAX8997/8966 chip is a multi-function device which includes
PMIC, RTC, Fuel Gauge, MUIC, Haptic, Flash control, and
Battery charging control.
The driver for it is located at drivers/mfd.

This patch supports battery charging control of MAX8997/8966 chip and
provides power supply class information to userspace.

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 2011-06-22 19:40:06 +09:00 committed by Anton Vorontsov
parent 7c4509b4cd
commit 149c077b4b
4 changed files with 220 additions and 1 deletions
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7
drivers/power/Kconfig
View file

@ -228,4 +228,11 @@ config CHARGER_GPIO
This driver can be build as a module. If so, the module will be
called gpio-charger.
config CHARGER_MAX8997
tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"
depends on MFD_MAX8997 && REGULATOR_MAX8997
help
Say Y to enable support for the battery charger control sysfs and
platform data of MAX8997/LP3974 PMICs.
endif # POWER_SUPPLY

1
drivers/power/Makefile
View file

@ -35,3 +35,4 @@ obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
obj-$(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

206
drivers/power/max8997_charger.c Normal file
View file

@ -0,0 +1,206 @@
/*
* max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
*
* Copyright (C) 2011 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/max8997.h>
#include <linux/mfd/max8997-private.h>
struct charger_data {
struct device *dev;
struct max8997_dev *iodev;
struct power_supply battery;
};
static enum power_supply_property max8997_battery_props[] = {
POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
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 max8997_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct charger_data *charger = container_of(psy,
struct charger_data, battery);
struct i2c_client *i2c = charger->iodev->i2c;
int ret;
u8 reg;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = 0;
ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
if (ret)
return ret;
if ((reg & (1 << 0)) == 0x1)
val->intval = POWER_SUPPLY_STATUS_FULL;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 0;
ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
if (ret)
return ret;
if ((reg & (1 << 2)) == 0x0)
val->intval = 1;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = 0;
ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
if (ret)
return ret;
/* DCINOK */
if (reg & (1 << 1))
val->intval = 1;
break;
default:
return -EINVAL;
}
return 0;
}
static __devinit int max8997_battery_probe(struct platform_device *pdev)
{
int ret = 0;
struct charger_data *charger;
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
if (!pdata)
return -EINVAL;
if (pdata->eoc_mA) {
u8 val = (pdata->eoc_mA - 50) / 10;
if (val < 0)
val = 0;
if (val > 0xf)
val = 0xf;
ret = max8997_update_reg(iodev->i2c,
MAX8997_REG_MBCCTRL5, val, 0xf);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot use i2c bus.\n");
return ret;
}
}
switch (pdata->timeout) {
case 5:
ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
0x2 << 4, 0x7 << 4);
break;
case 6:
ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
0x3 << 4, 0x7 << 4);
break;
case 7:
ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
0x4 << 4, 0x7 << 4);
break;
case 0:
ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
0x7 << 4, 0x7 << 4);
break;
default:
dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
pdata->timeout);
return -EINVAL;
}
if (ret < 0) {
dev_err(&pdev->dev, "Cannot use i2c bus.\n");
return ret;
}
charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
if (charger == NULL) {
dev_err(&pdev->dev, "Cannot allocate memory.\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, charger);
charger->battery.name = "max8997_pmic";
charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
charger->battery.get_property = max8997_battery_get_property;
charger->battery.properties = max8997_battery_props;
charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
charger->dev = &pdev->dev;
charger->iodev = iodev;
ret = power_supply_register(&pdev->dev, &charger->battery);
if (ret) {
dev_err(&pdev->dev, "failed: power supply register\n");
goto err;
}
return 0;
err:
kfree(charger);
return ret;
}
static int __devexit max8997_battery_remove(struct platform_device *pdev)
{
struct charger_data *charger = platform_get_drvdata(pdev);
power_supply_unregister(&charger->battery);
kfree(charger);
return 0;
}
static const struct platform_device_id max8997_battery_id[] = {
{ "max8997-battery", 0 },
};
static struct platform_driver max8997_battery_driver = {
.driver = {
.name = "max8997-battery",
.owner = THIS_MODULE,
},
.probe = max8997_battery_probe,
.remove = __devexit_p(max8997_battery_remove),
.id_table = max8997_battery_id,
};
static int __init max8997_battery_init(void)
{
return platform_driver_register(&max8997_battery_driver);
}
subsys_initcall(max8997_battery_init);
static void __exit max8997_battery_cleanup(void)
{
platform_driver_unregister(&max8997_battery_driver);
}
module_exit(max8997_battery_cleanup);
MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");

7
include/linux/mfd/max8997.h
View file

@ -107,11 +107,16 @@ struct max8997_platform_data {
unsigned int buck5_voltage[8];
bool buck5_gpiodvs;
/* ---- Charger control ---- */
/* eoc stands for 'end of charge' */
int eoc_mA; /* 50 ~ 200mA by 10mA step */
/* charge Full Timeout */
int timeout; /* 0 (no timeout), 5, 6, 7 hours */
/* MUIC: Not implemented */
/* HAPTIC: Not implemented */
/* RTC: Not implemented */
/* Flash: Not implemented */
/* Charger control: Not implemented */
};
#endif /* __LINUX_MFD_MAX8998_H */