power_supply: Add gpio charger driver (5070437c) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/power/Kconfig

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	@@ -185,4 +185,14 @@ config CHARGER_TWL4030
	help		help
	Say Y here to enable support for TWL4030 Battery Charge Interface.		Say Y here to enable support for TWL4030 Battery Charge Interface.

			config CHARGER_GPIO
			tristate "GPIO charger"
			depends on GPIOLIB
			help
			Say Y to include support for chargers which report their online status
			through a GPIO pin.

			This driver can be build as a module. If so, the module will be
			called gpio-charger.

	endif # POWER_SUPPLY		endif # POWER_SUPPLY

drivers/power/Makefile

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	@@ -32,3 +32,4 @@ obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
	obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o		obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
	obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o		obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
	obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o		obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
			obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o

drivers/power/gpio-charger.c

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			/*
			* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
			* Driver for chargers which report their online status through a GPIO pin
			*
			* 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.
			*
			* 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.,
			* 675 Mass Ave, Cambridge, MA 02139, USA.
			*
			*/

			#include <linux/device.h>
			#include <linux/gpio.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/power/gpio-charger.h>

			struct gpio_charger {
			const struct gpio_charger_platform_data *pdata;
			unsigned int irq;

			struct power_supply charger;
			};

			static irqreturn_t gpio_charger_irq(int irq, void *devid)
			{
			struct power_supply *charger = devid;

			power_supply_changed(charger);

			return IRQ_HANDLED;
			}

			static inline struct gpio_charger psy_to_gpio_charger(struct power_supply psy)
			{
			return container_of(psy, struct gpio_charger, charger);
			}

			static int gpio_charger_get_property(struct power_supply *psy,
			enum power_supply_property psp, union power_supply_propval *val)
			{
			struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
			const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;

			switch (psp) {
			case POWER_SUPPLY_PROP_ONLINE:
			val->intval = gpio_get_value(pdata->gpio);
			val->intval ^= pdata->gpio_active_low;
			break;
			default:
			return -EINVAL;
			}

			return 0;
			}

			static enum power_supply_property gpio_charger_properties[] = {
			POWER_SUPPLY_PROP_ONLINE,
			};

			static int __devinit gpio_charger_probe(struct platform_device *pdev)
			{
			const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
			struct gpio_charger *gpio_charger;
			struct power_supply *charger;
			int ret;
			int irq;

			if (!pdata) {
			dev_err(&pdev->dev, "No platform data\n");
			return -EINVAL;
			}

			if (!gpio_is_valid(pdata->gpio)) {
			dev_err(&pdev->dev, "Invalid gpio pin\n");
			return -EINVAL;
			}

			gpio_charger = kzalloc(sizeof(*gpio_charger), GFP_KERNEL);

			charger = &gpio_charger->charger;

			charger->name = pdata->name;
			charger->type = pdata->type;
			charger->properties = gpio_charger_properties;
			charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
			charger->get_property = gpio_charger_get_property;
			charger->supplied_to = pdata->supplied_to;
			charger->num_supplicants = pdata->num_supplicants;

			ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
			if (ret) {
			dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
			goto err_free;
			}
			ret = gpio_direction_input(pdata->gpio);
			if (ret) {
			dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
			goto err_gpio_free;
			}

			irq = gpio_to_irq(pdata->gpio);
			if (irq > 0) {
			ret = request_irq(irq, gpio_charger_irq,
			IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
			dev_name(&pdev->dev), charger);
			if (ret)
			dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
			else
			gpio_charger->irq = irq;
			}

			gpio_charger->pdata = pdata;

			ret = power_supply_register(&pdev->dev, charger);
			if (ret < 0) {
			dev_err(&pdev->dev, "Failed to register power supply: %d\n", ret);
			goto err_irq_free;
			}

			platform_set_drvdata(pdev, gpio_charger);

			return 0;

			err_irq_free:
			if (gpio_charger->irq)
			free_irq(gpio_charger->irq, charger);
			err_gpio_free:
			gpio_free(pdata->gpio);
			err_free:
			kfree(gpio_charger);
			return ret;
			}

			static int __devexit gpio_charger_remove(struct platform_device *pdev)
			{
			struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);

			power_supply_unregister(&gpio_charger->charger);

			if (gpio_charger->irq)
			free_irq(gpio_charger->irq, &gpio_charger->charger);
			gpio_free(gpio_charger->pdata->gpio);

			platform_set_drvdata(pdev, NULL);
			kfree(gpio_charger);

			return 0;
			}

			static struct platform_driver gpio_charger_driver = {
			.probe = gpio_charger_probe,
			.remove = __devexit_p(gpio_charger_remove),
			.driver = {
			.name = "gpio-charger",
			.owner = THIS_MODULE,
			},
			};

			static int __init gpio_charger_init(void)
			{
			return platform_driver_register(&gpio_charger_driver);
			}
			module_init(gpio_charger_init);

			static void __exit gpio_charger_exit(void)
			{
			platform_driver_unregister(&gpio_charger_driver);
			}
			module_exit(gpio_charger_exit);

			MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
			MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
			MODULE_LICENSE("GPL");
			MODULE_ALIAS("platform:gpio-charger");

include/linux/power/gpio-charger.h

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			/*
			* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
			*
			* 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.
			*
			* 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.,
			* 675 Mass Ave, Cambridge, MA 02139, USA.
			*
			*/

			#ifndef __LINUX_POWER_GPIO_CHARGER_H__
			#define __LINUX_POWER_GPIO_CHARGER_H__

			#include <linux/power_supply.h>
			#include <linux/types.h>

			/**
			* struct gpio_charger_platform_data - platform_data for gpio_charger devices
			* @name: Name for the chargers power_supply device
			* @type: Type of the charger
			* @gpio: GPIO which is used to indicate the chargers status
			* @gpio_active_low: Should be set to 1 if the GPIO is active low otherwise 0
			* @supplied_to: Array of battery names to which this chargers supplies power
			* @num_supplicants: Number of entries in the supplied_to array
			*/
			struct gpio_charger_platform_data {
			const char *name;
			enum power_supply_type type;

			int gpio;
			int gpio_active_low;

			char **supplied_to;
			size_t num_supplicants;
			};

			#endif