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Commit bb4ce970 authored by Donggeun Kim's avatar Donggeun Kim Committed by Anton Vorontsov
Browse files

power_supply: Add charger driver for MAX8998/LP3974 



This patch supports power supply APIs for MAX8998/LP3974.

Signed-off-by: default avatarDonggeun Kim <dg77.kim@samsung.com>
Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: default avatarKyungMin Park <kyungmin.park@samsung.com>
Acked-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent 149c077b

drivers/mfd/max8998.c

+2 −0
Original line number Diff line number Diff line
@@ -39,6 +39,8 @@ static struct mfd_cell max8998_devs[] = { 
		.name = "max8998-pmic",

	}, {

		.name = "max8998-rtc",

	}, {

		.name = "max8998-battery",

	},

};

drivers/power/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -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

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/power/max8998_charger.c

0 → 100644
+218 −0
Original line number Diff line number Diff line 
/*

 * 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");

include/linux/mfd/max8998.h

+12 −0
Original line number Diff line number Diff line
@@ -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 */