+++ /dev/null
-/*
- * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
- * Driver for chargers indicating their 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/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-#include <linux/power_supply.h>
-#include <linux/interrupt.h>
-#include <linux/gpio.h>
-
-#include <linux/power/gpio-charger.h>
-
-struct gpio_charger {
- const struct gpio_charger_platform_data *pdata;
-
- 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;
-
- if (!pdata) {
- dev_err(&pdev->dev, "No platform data");
- 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->batteries;
- charger->num_supplicants = pdata->num_batteries;
-
- if (gpio_is_valid(pdata->gpio)) {
- 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;
- }
- 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;
- }
-
- gpio_charger->irq = gpio_to_irq(pdata->gpio);
- if (gpio_charger->irq >= 0) {
- ret = request_irq(gpio_charger->irq, gpio_charger_irq,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
- dev_name(&pdev->dev), charger);
- if (ret) {
- dev_warn(&pdev->dev, "Failed to request online gpio irq: %d\n", ret);
- gpio_charger->irq = -1;
- }
- }
- }
-
- ret = power_supply_register(&pdev->dev, charger);
- if (ret < 0) {
- dev_err(&pdev->dev, "Failed to register power supply: %d\n", ret);
- goto err_gpio_free;
- }
-
- gpio_charger->pdata = pdata;
- platform_set_drvdata(pdev, gpio_charger);
-
- return 0;
-
-err_gpio_free:
- if (gpio_is_valid(pdata->gpio)) {
- if (gpio_charger->irq >= 0)
- free_irq(gpio_charger->irq, charger);
- gpio_free(pdata->gpio);
- }
-err:
- return ret;
-}
-
-static int __devexit gpio_charger_remove(struct platform_device *pdev)
-{
- struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
- const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
-
- power_supply_unregister(&gpio_charger->charger);
-
- if (gpio_is_valid(pdata->gpio)) {
- if (gpio_charger->irq >= 0)
- free_irq(gpio_charger->irq, &gpio_charger->charger);
- gpio_free(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 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 indicating their status through a gpio");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:gpio-charger");
projects / openwrt / svn-archive / archive.git / blobdiff