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Commit 149c077b authored by Donggeun Kim's avatar Donggeun Kim Committed by Anton Vorontsov
Browse files

power_supply: Add charger driver for MAX8997/8966 



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: 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 7c4509b4

drivers/power/Kconfig

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

drivers/power/Makefile

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

drivers/power/max8997_charger.c

0 → 100644
+206 −0
Original line number Diff line number Diff line 
/*

 * 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");

include/linux/mfd/max8997.h

+6 −1
Original line number Diff line number Diff line
@@ -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 */