Commit c94d4ed0 authored by Mike Looijmans's avatar Mike Looijmans Committed by Sebastian Reichel
Browse files

power: supply: Add ltc3651-charger driver 



The LTC3651 reports its status via GPIO lines. This driver translates
the GPIO levels to battery charger status information via sysfs.
It relies on devicetree to supply the IO configuration.

Signed-off-by: default avatarMike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.co.uk>
parent 9d556bb4

drivers/power/supply/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -408,6 +408,13 @@ config CHARGER_MANAGER 
          runtime and in suspend-to-RAM by waking up the system periodically

          with help of suspend_again support.



config CHARGER_LTC3651

	tristate "LTC3651 charger"

	depends on GPIOLIB

	help

	  Say Y to include support for the LTC3651 battery charger which reports

	  its status via GPIO lines.



config CHARGER_MAX14577

	tristate "Maxim MAX14577/77836 battery charger driver"

	depends on MFD_MAX14577

drivers/power/supply/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ 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_LTC3651)	+= ltc3651-charger.o

obj-$(CONFIG_CHARGER_MAX14577)	+= max14577_charger.o

obj-$(CONFIG_CHARGER_DETECTOR_MAX14656)	+= max14656_charger_detector.o

obj-$(CONFIG_CHARGER_MAX77693)	+= max77693_charger.o

drivers/power/supply/ltc3651-charger.c

0 → 100644
+210 −0
Original line number Diff line number Diff line 
/*

 *  Copyright (C) 2017, Topic Embedded Products

 *  Driver for LTC3651 charger IC.

 *

 *  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.

 */



#include <linux/device.h>

#include <linux/gpio/consumer.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/slab.h>

#include <linux/of.h>



struct ltc3651_charger {

	struct power_supply *charger;

	struct power_supply_desc charger_desc;

	struct gpio_desc *acpr_gpio;

	struct gpio_desc *fault_gpio;

	struct gpio_desc *chrg_gpio;

};



static irqreturn_t ltc3651_charger_irq(int irq, void *devid)

{

	struct power_supply *charger = devid;



	power_supply_changed(charger);



	return IRQ_HANDLED;

}



static inline struct ltc3651_charger *psy_to_ltc3651_charger(

	struct power_supply *psy)

{

	return power_supply_get_drvdata(psy);

}



static int ltc3651_charger_get_property(struct power_supply *psy,

		enum power_supply_property psp, union power_supply_propval *val)

{

	struct ltc3651_charger *ltc3651_charger = psy_to_ltc3651_charger(psy);



	switch (psp) {

	case POWER_SUPPLY_PROP_STATUS:

		if (!ltc3651_charger->chrg_gpio) {

			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;

			break;

		}

		if (gpiod_get_value(ltc3651_charger->chrg_gpio))

			val->intval = POWER_SUPPLY_STATUS_CHARGING;

		else

			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;

		break;

	case POWER_SUPPLY_PROP_ONLINE:

		val->intval = gpiod_get_value(ltc3651_charger->acpr_gpio);

		break;

	case POWER_SUPPLY_PROP_HEALTH:

		if (!ltc3651_charger->fault_gpio) {

			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;

			break;

		}

		if (!gpiod_get_value(ltc3651_charger->fault_gpio)) {

			val->intval = POWER_SUPPLY_HEALTH_GOOD;

			break;

		}

		/*

		 * If the fault pin is active, the chrg pin explains the type

		 * of failure.

		 */

		if (!ltc3651_charger->chrg_gpio) {

			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;

			break;

		}

		val->intval = gpiod_get_value(ltc3651_charger->chrg_gpio) ?

				POWER_SUPPLY_HEALTH_OVERHEAT :

				POWER_SUPPLY_HEALTH_DEAD;

		break;

	default:

		return -EINVAL;

	}



	return 0;

}



static enum power_supply_property ltc3651_charger_properties[] = {

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_ONLINE,

	POWER_SUPPLY_PROP_HEALTH,

};



static int ltc3651_charger_probe(struct platform_device *pdev)

{

	struct power_supply_config psy_cfg = {};

	struct ltc3651_charger *ltc3651_charger;

	struct power_supply_desc *charger_desc;

	int ret;



	ltc3651_charger = devm_kzalloc(&pdev->dev, sizeof(*ltc3651_charger),

					GFP_KERNEL);

	if (!ltc3651_charger)

		return -ENOMEM;



	ltc3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,

					"lltc,acpr", GPIOD_IN);

	if (IS_ERR(ltc3651_charger->acpr_gpio)) {

		ret = PTR_ERR(ltc3651_charger->charger);

		dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret);

		return ret;

	}

	ltc3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev,

					"lltc,fault", GPIOD_IN);

	if (IS_ERR(ltc3651_charger->fault_gpio)) {

		ret = PTR_ERR(ltc3651_charger->charger);

		dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret);

		return ret;

	}

	ltc3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev,

					"lltc,chrg", GPIOD_IN);

	if (IS_ERR(ltc3651_charger->chrg_gpio)) {

		ret = PTR_ERR(ltc3651_charger->charger);

		dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret);

		return ret;

	}



	charger_desc = &ltc3651_charger->charger_desc;

	charger_desc->name = pdev->dev.of_node->name;

	charger_desc->type = POWER_SUPPLY_TYPE_MAINS;

	charger_desc->properties = ltc3651_charger_properties;

	charger_desc->num_properties = ARRAY_SIZE(ltc3651_charger_properties);

	charger_desc->get_property = ltc3651_charger_get_property;

	psy_cfg.of_node = pdev->dev.of_node;

	psy_cfg.drv_data = ltc3651_charger;



	ltc3651_charger->charger = devm_power_supply_register(&pdev->dev,

						      charger_desc, &psy_cfg);

	if (IS_ERR(ltc3651_charger->charger)) {

		ret = PTR_ERR(ltc3651_charger->charger);

		dev_err(&pdev->dev, "Failed to register power supply: %d\n",

			ret);

		return ret;

	}



	/*

	 * Acquire IRQs for the GPIO pins if possible. If the system does not

	 * support IRQs on these pins, userspace will have to poll the sysfs

	 * files manually.

	 */

	if (ltc3651_charger->acpr_gpio) {

		ret = gpiod_to_irq(ltc3651_charger->acpr_gpio);

		if (ret >= 0)

			ret = devm_request_any_context_irq(&pdev->dev, ret,

				ltc3651_charger_irq,

				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				dev_name(&pdev->dev), ltc3651_charger->charger);

		if (ret < 0)

			dev_warn(&pdev->dev, "Failed to request acpr irq\n");

	}

	if (ltc3651_charger->fault_gpio) {

		ret = gpiod_to_irq(ltc3651_charger->fault_gpio);

		if (ret >= 0)

			ret = devm_request_any_context_irq(&pdev->dev, ret,

				ltc3651_charger_irq,

				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				dev_name(&pdev->dev), ltc3651_charger->charger);

		if (ret < 0)

			dev_warn(&pdev->dev, "Failed to request fault irq\n");

	}

	if (ltc3651_charger->chrg_gpio) {

		ret = gpiod_to_irq(ltc3651_charger->chrg_gpio);

		if (ret >= 0)

			ret = devm_request_any_context_irq(&pdev->dev, ret,

				ltc3651_charger_irq,

				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

				dev_name(&pdev->dev), ltc3651_charger->charger);

		if (ret < 0)

			dev_warn(&pdev->dev, "Failed to request chrg irq\n");

	}



	platform_set_drvdata(pdev, ltc3651_charger);



	return 0;

}



static const struct of_device_id ltc3651_charger_match[] = {

	{ .compatible = "lltc,ltc3651-charger" },

	{ }

};

MODULE_DEVICE_TABLE(of, ltc3651_charger_match);



static struct platform_driver ltc3651_charger_driver = {

	.probe = ltc3651_charger_probe,

	.driver = {

		.name = "ltc3651-charger",

		.of_match_table = ltc3651_charger_match,

	},

};



module_platform_driver(ltc3651_charger_driver);



MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");

MODULE_DESCRIPTION("Driver for LTC3651 charger");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:ltc3651-charger");

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