mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Jingoo Han](/assets/img/avatar_default.png)
The driver core clears the driver data to NULL after device_release or on
probe failure, since commit 0998d06310
(device-core: Ensure drvdata = NULL when no driver is bound). Thus, it is
not needed to manually clear the device driver data to NULL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
190 lines
4.8 KiB
C
190 lines
4.8 KiB
C
/*
|
|
* 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_cansleep(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 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 = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger),
|
|
GFP_KERNEL);
|
|
if (!gpio_charger) {
|
|
dev_err(&pdev->dev, "Failed to alloc driver structure\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
charger = &gpio_charger->charger;
|
|
|
|
charger->name = pdata->name ? pdata->name : "gpio-charger";
|
|
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;
|
|
}
|
|
|
|
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_gpio_free;
|
|
}
|
|
|
|
irq = gpio_to_irq(pdata->gpio);
|
|
if (irq > 0) {
|
|
ret = request_any_context_irq(irq, gpio_charger_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
dev_name(&pdev->dev), charger);
|
|
if (ret < 0)
|
|
dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
|
|
else
|
|
gpio_charger->irq = irq;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, gpio_charger);
|
|
|
|
return 0;
|
|
|
|
err_gpio_free:
|
|
gpio_free(pdata->gpio);
|
|
err_free:
|
|
return ret;
|
|
}
|
|
|
|
static int gpio_charger_remove(struct platform_device *pdev)
|
|
{
|
|
struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
|
|
|
|
if (gpio_charger->irq)
|
|
free_irq(gpio_charger->irq, &gpio_charger->charger);
|
|
|
|
power_supply_unregister(&gpio_charger->charger);
|
|
|
|
gpio_free(gpio_charger->pdata->gpio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int gpio_charger_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
|
|
|
|
power_supply_changed(&gpio_charger->charger);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, NULL, gpio_charger_resume);
|
|
|
|
static struct platform_driver gpio_charger_driver = {
|
|
.probe = gpio_charger_probe,
|
|
.remove = gpio_charger_remove,
|
|
.driver = {
|
|
.name = "gpio-charger",
|
|
.owner = THIS_MODULE,
|
|
.pm = &gpio_charger_pm_ops,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(gpio_charger_driver);
|
|
|
|
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");
|