mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Chanwoo Choi](/assets/img/avatar_default.png)
This patch use devm_extcon_dev_allocate() to simplify the memory control of extcon device. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Felipe Balbi <balbi@ti.com>
194 lines
5 KiB
C
194 lines
5 KiB
C
/*
|
|
* drivers/extcon/extcon_gpio.c
|
|
*
|
|
* Single-state GPIO extcon driver based on extcon class
|
|
*
|
|
* Copyright (C) 2008 Google, Inc.
|
|
* Author: Mike Lockwood <lockwood@android.com>
|
|
*
|
|
* Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon
|
|
* (originally switch class is supported)
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/extcon.h>
|
|
#include <linux/extcon/extcon-gpio.h>
|
|
|
|
struct gpio_extcon_data {
|
|
struct extcon_dev *edev;
|
|
unsigned gpio;
|
|
bool gpio_active_low;
|
|
const char *state_on;
|
|
const char *state_off;
|
|
int irq;
|
|
struct delayed_work work;
|
|
unsigned long debounce_jiffies;
|
|
bool check_on_resume;
|
|
};
|
|
|
|
static void gpio_extcon_work(struct work_struct *work)
|
|
{
|
|
int state;
|
|
struct gpio_extcon_data *data =
|
|
container_of(to_delayed_work(work), struct gpio_extcon_data,
|
|
work);
|
|
|
|
state = gpio_get_value(data->gpio);
|
|
if (data->gpio_active_low)
|
|
state = !state;
|
|
extcon_set_state(data->edev, state);
|
|
}
|
|
|
|
static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
|
|
{
|
|
struct gpio_extcon_data *extcon_data = dev_id;
|
|
|
|
queue_delayed_work(system_power_efficient_wq, &extcon_data->work,
|
|
extcon_data->debounce_jiffies);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf)
|
|
{
|
|
struct device *dev = edev->dev.parent;
|
|
struct gpio_extcon_data *extcon_data = dev_get_drvdata(dev);
|
|
const char *state;
|
|
|
|
if (extcon_get_state(edev))
|
|
state = extcon_data->state_on;
|
|
else
|
|
state = extcon_data->state_off;
|
|
|
|
if (state)
|
|
return sprintf(buf, "%s\n", state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int gpio_extcon_probe(struct platform_device *pdev)
|
|
{
|
|
struct gpio_extcon_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct gpio_extcon_data *extcon_data;
|
|
int ret;
|
|
|
|
if (!pdata)
|
|
return -EBUSY;
|
|
if (!pdata->irq_flags) {
|
|
dev_err(&pdev->dev, "IRQ flag is not specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
|
|
GFP_KERNEL);
|
|
if (!extcon_data)
|
|
return -ENOMEM;
|
|
|
|
extcon_data->edev = devm_extcon_dev_allocate(&pdev->dev, NULL);
|
|
if (IS_ERR(extcon_data->edev)) {
|
|
dev_err(&pdev->dev, "failed to allocate extcon device\n");
|
|
return -ENOMEM;
|
|
}
|
|
extcon_data->edev->name = pdata->name;
|
|
extcon_data->edev->dev.parent = &pdev->dev;
|
|
|
|
extcon_data->gpio = pdata->gpio;
|
|
extcon_data->gpio_active_low = pdata->gpio_active_low;
|
|
extcon_data->state_on = pdata->state_on;
|
|
extcon_data->state_off = pdata->state_off;
|
|
extcon_data->check_on_resume = pdata->check_on_resume;
|
|
if (pdata->state_on && pdata->state_off)
|
|
extcon_data->edev->print_state = extcon_gpio_print_state;
|
|
|
|
ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN,
|
|
pdev->name);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (pdata->debounce) {
|
|
ret = gpio_set_debounce(extcon_data->gpio,
|
|
pdata->debounce * 1000);
|
|
if (ret < 0)
|
|
extcon_data->debounce_jiffies =
|
|
msecs_to_jiffies(pdata->debounce);
|
|
}
|
|
|
|
ret = devm_extcon_dev_register(&pdev->dev, extcon_data->edev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work);
|
|
|
|
extcon_data->irq = gpio_to_irq(extcon_data->gpio);
|
|
if (extcon_data->irq < 0)
|
|
return extcon_data->irq;
|
|
|
|
ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler,
|
|
pdata->irq_flags, pdev->name,
|
|
extcon_data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
platform_set_drvdata(pdev, extcon_data);
|
|
/* Perform initial detection */
|
|
gpio_extcon_work(&extcon_data->work.work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_extcon_remove(struct platform_device *pdev)
|
|
{
|
|
struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev);
|
|
|
|
cancel_delayed_work_sync(&extcon_data->work);
|
|
free_irq(extcon_data->irq, extcon_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int gpio_extcon_resume(struct device *dev)
|
|
{
|
|
struct gpio_extcon_data *extcon_data;
|
|
|
|
extcon_data = dev_get_drvdata(dev);
|
|
if (extcon_data->check_on_resume)
|
|
queue_delayed_work(system_power_efficient_wq,
|
|
&extcon_data->work, extcon_data->debounce_jiffies);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume);
|
|
|
|
static struct platform_driver gpio_extcon_driver = {
|
|
.probe = gpio_extcon_probe,
|
|
.remove = gpio_extcon_remove,
|
|
.driver = {
|
|
.name = "extcon-gpio",
|
|
.owner = THIS_MODULE,
|
|
.pm = &gpio_extcon_pm_ops,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(gpio_extcon_driver);
|
|
|
|
MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
|
|
MODULE_DESCRIPTION("GPIO extcon driver");
|
|
MODULE_LICENSE("GPL");
|