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Commit 55e64701 authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Anton Vorontsov
Browse files

power_supply: Add charger support for Maxim 14577 



MAX14577 chip is a multi-function device which includes MUIC, charger and
voltage regulator. The driver is located in drivers/mfd.

This patch supports battery charging control of MAX14577 chip and provides
power supply class information to userspace.

Signed-off-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarAnton Vorontsov <anton@enomsg.org>
parent fac171ac

drivers/power/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -317,6 +317,13 @@ config CHARGER_MANAGER 
          runtime and in suspend-to-RAM by waking up the system periodically

          with help of suspend_again support.



config CHARGER_MAX14577

	tristate "Maxim MAX14577 MUIC battery charger driver"

	depends on MFD_MAX14577

	help

	  Say Y to enable support for the battery charger control sysfs and

	  platform data of MAX14577 MUICs.



config CHARGER_MAX8997

	tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"

	depends on MFD_MAX8997 && REGULATOR_MAX8997

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ obj-$(CONFIG_CHARGER_LP8727) += lp8727_charger.o 
obj-$(CONFIG_CHARGER_LP8788)	+= lp8788-charger.o

obj-$(CONFIG_CHARGER_GPIO)	+= gpio-charger.o

obj-$(CONFIG_CHARGER_MANAGER)	+= charger-manager.o

obj-$(CONFIG_CHARGER_MAX14577)	+= max14577_charger.o

obj-$(CONFIG_CHARGER_MAX8997)	+= max8997_charger.o

obj-$(CONFIG_CHARGER_MAX8998)	+= max8998_charger.o

obj-$(CONFIG_CHARGER_BQ2415X)	+= bq2415x_charger.o

drivers/power/max14577_charger.c

0 → 100644
+311 −0
Original line number Diff line number Diff line 
/*

 * Battery charger driver for the Maxim 14577

 *

 * Copyright (C) 2013 Samsung Electronics

 * Krzysztof Kozlowski <k.kozlowski@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.

 */



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/mfd/max14577-private.h>



struct max14577_charger {

	struct device *dev;

	struct max14577	*max14577;

	struct power_supply	charger;



	unsigned int	charging_state;

	unsigned int	battery_state;

};



static int max14577_get_charger_state(struct max14577_charger *chg)

{

	struct regmap *rmap = chg->max14577->regmap;

	int state = POWER_SUPPLY_STATUS_DISCHARGING;

	u8 reg_data;



	/*

	 * Charging occurs only if:

	 *  - CHGCTRL2/MBCHOSTEN == 1

	 *  - STATUS2/CGMBC == 1

	 *

	 * TODO:

	 *  - handle FULL after Top-off timer (EOC register may be off

	 *    and the charger won't be charging although MBCHOSTEN is on)

	 *  - handle properly dead-battery charging (respect timer)

	 *  - handle timers (fast-charge and prequal) /MBCCHGERR/

	 */

	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);

	if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)

		goto state_set;



	max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);

	if (reg_data & STATUS3_CGMBC_MASK) {

		/* Charger or USB-cable is connected */

		if (reg_data & STATUS3_EOC_MASK)

			state = POWER_SUPPLY_STATUS_FULL;

		else

			state = POWER_SUPPLY_STATUS_CHARGING;

		goto state_set;

	}



state_set:

	chg->charging_state = state;

	return state;

}



/*

 * Supported charge types:

 *  - POWER_SUPPLY_CHARGE_TYPE_NONE

 *  - POWER_SUPPLY_CHARGE_TYPE_FAST

 */

static int max14577_get_charge_type(struct max14577_charger *chg)

{

	/*

	 * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?

	 * As spec says:

	 * [after reaching EOC interrupt]

	 * "When the battery is fully charged, the 30-minute (typ)

	 *  top-off timer starts. The device continues to trickle

	 *  charge the battery until the top-off timer runs out."

	 */

	if (max14577_get_charger_state(chg) == POWER_SUPPLY_STATUS_CHARGING)

		return POWER_SUPPLY_CHARGE_TYPE_FAST;

	return POWER_SUPPLY_CHARGE_TYPE_NONE;

}



static int max14577_get_online(struct max14577_charger *chg)

{

	struct regmap *rmap = chg->max14577->regmap;

	u8 reg_data;



	max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);

	reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);

	switch (reg_data) {

	case MAX14577_CHARGER_TYPE_USB:

	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:

	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:

	case MAX14577_CHARGER_TYPE_SPECIAL_1A:

	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:

		return 1;

	case MAX14577_CHARGER_TYPE_NONE:

	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:

	case MAX14577_CHARGER_TYPE_RESERVED:

	default:

		return 0;

	}

}



/*

 * Supported health statuses:

 *  - POWER_SUPPLY_HEALTH_DEAD

 *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE

 *  - POWER_SUPPLY_HEALTH_GOOD

 */

static int max14577_get_battery_health(struct max14577_charger *chg)

{

	struct regmap *rmap = chg->max14577->regmap;

	int state = POWER_SUPPLY_HEALTH_GOOD;

	u8 reg_data;



	max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);

	reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);

	if (reg_data == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {

		state = POWER_SUPPLY_HEALTH_DEAD;

		goto state_set;

	}



	max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);

	if (reg_data & STATUS3_OVP_MASK) {

		state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;

		goto state_set;

	}



state_set:

	chg->battery_state = state;

	return state;

}



/*

 * Always returns 1.

 * The max14577 chip doesn't report any status of battery presence.

 * Lets assume that it will always be used with some battery.

 */

static int max14577_get_present(struct max14577_charger *chg)

{

	return 1;

}



/*

 * Sets charger registers to proper and safe default values.

 * Some of these values are equal to defaults in MAX14577E

 * data sheet but there are minor differences.

 */

static void max14577_charger_reg_init(struct max14577_charger *chg)

{

	struct regmap *rmap = chg->max14577->regmap;

	u8 reg_data;



	/*

	 * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)

	 * Charger-Detection Enable, default on (set CHGDETEN to 1)

	 * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit

	 */

	reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;

	max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,

			CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,

			reg_data);



	/* Battery Fast-Charge Timer, from SM-V700: 6hrs */

	reg_data = 0x3 << CHGCTRL1_TCHW_SHIFT;

	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL1, reg_data);



	/*

	 * Wall-Adapter Rapid Charge, default on

	 * Battery-Charger, default on

	 */

	reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;

	reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;

	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);



	/* Battery-Charger Constant Voltage (CV) Mode, from SM-V700: 4.35V */

	reg_data = 0xf << CHGCTRL3_MBCCVWRC_SHIFT;

	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL3, reg_data);



	/*

	 * Fast Battery-Charge Current Low, default 200-950mA

	 * Fast Battery-Charge Current High, from SM-V700: 450mA

	 */

	reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;

	reg_data |= 0x5 << CHGCTRL4_MBCICHWRCH_SHIFT;

	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL4, reg_data);



	/* End-of-Charge Current, from SM-V700: 50mA */

	reg_data = 0x0 << CHGCTRL5_EOCS_SHIFT;

	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL5, reg_data);



	/* Auto Charging Stop, default off */

	reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;

	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);



	/* Overvoltage-Protection Threshold, from SM-V700: 6.5V */

	reg_data = 0x2 << CHGCTRL7_OTPCGHCVS_SHIFT;

	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);

}



/* Support property from charger */

static enum power_supply_property max14577_charger_props[] = {

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_CHARGE_TYPE,

	POWER_SUPPLY_PROP_HEALTH,

	POWER_SUPPLY_PROP_PRESENT,

	POWER_SUPPLY_PROP_ONLINE,

	POWER_SUPPLY_PROP_MODEL_NAME,

	POWER_SUPPLY_PROP_MANUFACTURER,

};



static const char *model_name = "MAX14577";

static const char *manufacturer = "Maxim Integrated";



static int max14577_charger_get_property(struct power_supply *psy,

			    enum power_supply_property psp,

			    union power_supply_propval *val)

{

	struct max14577_charger *chg = container_of(psy,

						  struct max14577_charger,

						  charger);

	int ret = 0;



	switch (psp) {

	case POWER_SUPPLY_PROP_STATUS:

		val->intval = max14577_get_charger_state(chg);

		break;

	case POWER_SUPPLY_PROP_CHARGE_TYPE:

		val->intval = max14577_get_charge_type(chg);

		break;

	case POWER_SUPPLY_PROP_HEALTH:

		val->intval = max14577_get_battery_health(chg);

		break;

	case POWER_SUPPLY_PROP_PRESENT:

		val->intval = max14577_get_present(chg);

		break;

	case POWER_SUPPLY_PROP_ONLINE:

		val->intval = max14577_get_online(chg);

		break;

	case POWER_SUPPLY_PROP_MODEL_NAME:

		val->strval = model_name;

		break;

	case POWER_SUPPLY_PROP_MANUFACTURER:

		val->strval = manufacturer;

		break;

	default:

		return -EINVAL;

	}



	return ret;

}



static int max14577_charger_probe(struct platform_device *pdev)

{

	struct max14577_charger *chg;

	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);

	int ret;



	chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);

	if (!chg)

		return -ENOMEM;



	platform_set_drvdata(pdev, chg);

	chg->dev = &pdev->dev;

	chg->max14577 = max14577;



	max14577_charger_reg_init(chg);



	chg->charger.name = "max14577-charger",

	chg->charger.type = POWER_SUPPLY_TYPE_BATTERY,

	chg->charger.properties = max14577_charger_props,

	chg->charger.num_properties = ARRAY_SIZE(max14577_charger_props),

	chg->charger.get_property = max14577_charger_get_property,



	ret = power_supply_register(&pdev->dev, &chg->charger);

	if (ret) {

		dev_err(&pdev->dev, "failed: power supply register\n");

		return ret;

	}



	return 0;

}



static int max14577_charger_remove(struct platform_device *pdev)

{

	struct max14577_charger *chg = platform_get_drvdata(pdev);



	power_supply_unregister(&chg->charger);



	return 0;

}



static struct platform_driver max14577_charger_driver = {

	.driver = {

		.owner	= THIS_MODULE,

		.name	= "max14577-charger",

	},

	.probe		= max14577_charger_probe,

	.remove		= max14577_charger_remove,

};

module_platform_driver(max14577_charger_driver);



MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");

MODULE_DESCRIPTION("MAXIM 14577 charger driver");

MODULE_LICENSE("GPL");