185 lines
4.8 KiB
C
185 lines
4.8 KiB
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* Driver for chargers indicating their status through a GPIO pin
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/power/gpio-charger.h>
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struct gpio_charger {
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const struct gpio_charger_platform_data *pdata;
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int irq;
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struct power_supply charger;
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};
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static irqreturn_t gpio_charger_irq(int irq, void *devid)
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{
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struct power_supply *charger = devid;
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power_supply_changed(charger);
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return IRQ_HANDLED;
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}
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static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
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{
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return container_of(psy, struct gpio_charger, charger);
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}
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static int gpio_charger_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
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const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = gpio_get_value(pdata->gpio);
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val->intval ^= pdata->gpio_active_low;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property gpio_charger_properties[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static int __devinit gpio_charger_probe(struct platform_device *pdev)
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{
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const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
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struct gpio_charger *gpio_charger;
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struct power_supply *charger;
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int ret;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data");
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return -EINVAL;
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}
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gpio_charger = kzalloc(sizeof(*gpio_charger), GFP_KERNEL);
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charger = &gpio_charger->charger;
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charger->name = pdata->name;
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charger->type = pdata->type;
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charger->properties = gpio_charger_properties;
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charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
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charger->get_property = gpio_charger_get_property;
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charger->supplied_to = pdata->batteries;
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charger->num_supplicants = pdata->num_batteries;
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if (gpio_is_valid(pdata->gpio)) {
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ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
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if (ret) {
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dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
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goto err;
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}
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ret = gpio_direction_input(pdata->gpio);
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if (ret) {
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dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
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goto err_gpio_free;
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}
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gpio_charger->irq = gpio_to_irq(pdata->gpio);
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if (gpio_charger->irq >= 0) {
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ret = request_irq(gpio_charger->irq, gpio_charger_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), charger);
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if (ret) {
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dev_warn(&pdev->dev, "Failed to request online gpio irq: %d\n", ret);
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gpio_charger->irq = -1;
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}
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}
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}
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ret = power_supply_register(&pdev->dev, charger);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register power supply: %d\n", ret);
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goto err_gpio_free;
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}
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gpio_charger->pdata = pdata;
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platform_set_drvdata(pdev, gpio_charger);
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return 0;
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err_gpio_free:
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if (gpio_is_valid(pdata->gpio)) {
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if (gpio_charger->irq >= 0)
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free_irq(gpio_charger->irq, charger);
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gpio_free(pdata->gpio);
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}
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err:
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return ret;
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}
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static int __devexit gpio_charger_remove(struct platform_device *pdev)
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{
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struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
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const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
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power_supply_unregister(&gpio_charger->charger);
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if (gpio_is_valid(pdata->gpio)) {
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if (gpio_charger->irq >= 0)
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free_irq(gpio_charger->irq, &gpio_charger->charger);
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gpio_free(pdata->gpio);
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}
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platform_set_drvdata(pdev, NULL);
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kfree(gpio_charger);
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return 0;
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}
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static struct platform_driver gpio_charger_driver = {
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.probe = gpio_charger_probe,
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.remove = __devexit_p(gpio_charger_remove),
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.driver = {
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.name = "gpio-charger",
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.owner = THIS_MODULE,
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},
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};
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static int __init gpio_charger_init(void)
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{
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return platform_driver_register(&gpio_charger_driver);
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}
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module_init(gpio_charger_init);
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static void gpio_charger_exit(void)
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{
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platform_driver_unregister(&gpio_charger_driver);
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}
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module_exit(gpio_charger_exit);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("Driver for chargers indicating their status through a gpio");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:gpio-charger");
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