power_supply: Add charger driver for MAX8998/LP3974 (bb4ce970) · Commits · 戴 / test

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 */

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