Release 4.14 drivers/extcon/extcon-gpio.c

/*
 * 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/extcon.h>
#include <linux/extcon/extcon-gpio.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/workqueue.h>


struct gpio_extcon_data {
	
struct extcon_dev *edev;
	
int irq;
	
struct delayed_work work;
	
unsigned long debounce_jiffies;

	
struct gpio_desc *id_gpiod;
	
struct gpio_extcon_pdata *pdata;
};



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 = gpiod_get_value_cansleep(data->id_gpiod);
	if (data->pdata->gpio_active_low)
		state = !state;

	extcon_set_state_sync(data->edev, data->pdata->extcon_id, state);
}

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Guenter Roeck
11
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1
16.67%
Chanwoo Choi
11
15.94%
4
66.67%
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69
100.00%
6
100.00%



static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
{
	struct gpio_extcon_data *data = dev_id;

	queue_delayed_work(system_power_efficient_wq, &data->work,
			      data->debounce_jiffies);
	return IRQ_HANDLED;
}

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33.33%
Mark Brown
3
8.11%
1
33.33%
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37
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3
100.00%



static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
{
	struct gpio_extcon_pdata *pdata = data->pdata;
	int ret;

	ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN,
				dev_name(dev));
	if (ret < 0)
		return ret;

	data->id_gpiod = gpio_to_desc(pdata->gpio);
	if (!data->id_gpiod)
		return -EINVAL;

	if (pdata->debounce) {
		ret = gpiod_set_debounce(data->id_gpiod,
					pdata->debounce * 1000);
		if (ret < 0)
			data->debounce_jiffies =
				msecs_to_jiffies(pdata->debounce);
	}

	data->irq = gpiod_to_irq(data->id_gpiod);
	if (data->irq < 0)
		return data->irq;

	return 0;
}

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static int gpio_extcon_probe(struct platform_device *pdev)
{
	struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct gpio_extcon_data *data;
	int ret;

	if (!pdata)
		return -EBUSY;
	if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE)
		return -EINVAL;

	data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
				   GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	data->pdata = pdata;

	/* Initialize the gpio */
	ret = gpio_extcon_init(&pdev->dev, data);
	if (ret < 0)
		return ret;

	/* Allocate the memory of extcon devie and register extcon device */
	data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id);
	if (IS_ERR(data->edev)) {
		dev_err(&pdev->dev, "failed to allocate extcon device\n");
		return -ENOMEM;
	}

	ret = devm_extcon_dev_register(&pdev->dev, data->edev);
	if (ret < 0)
		return ret;

	INIT_DELAYED_WORK(&data->work, gpio_extcon_work);

	/*
         * Request the interrupt of gpio to detect whether external connector
         * is attached or detached.
         */
	ret = devm_request_any_context_irq(&pdev->dev, data->irq,
					gpio_irq_handler, pdata->irq_flags,
					pdev->name, data);
	if (ret < 0)
		return ret;

	platform_set_drvdata(pdev, data);
	/* Perform initial detection */
	gpio_extcon_work(&data->work.work);

	return 0;
}

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Chanwoo Choi
52
21.14%
5
35.71%
Guenter Roeck
31
12.60%
2
14.29%
Axel Lin
9
3.66%
2
14.29%
Sangjung Woo
8
3.25%
1
7.14%
Jingoo Han
4
1.63%
1
7.14%
Rongjun Ying
3
1.22%
1
7.14%
Moritz Fischer
1
0.41%
1
7.14%
Total
246
100.00%
14
100.00%



static int gpio_extcon_remove(struct platform_device *pdev)
{
	struct gpio_extcon_data *data = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&data->work);

	return 0;
}

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#ifdef CONFIG_PM_SLEEP


static int gpio_extcon_resume(struct device *dev)
{
	struct gpio_extcon_data *data;

	data = dev_get_drvdata(dev);
	if (data->pdata->check_on_resume)
		queue_delayed_work(system_power_efficient_wq,
			&data->work, data->debounce_jiffies);

	return 0;
}
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#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",
		.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");
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Chanwoo Choi
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32.86%
8
36.36%
Rongjun Ying
58
8.18%
1
4.55%
Guenter Roeck
42
5.92%
3
13.64%
Jingoo Han
10
1.41%
2
9.09%
George Cherian
10
1.41%
1
4.55%
Axel Lin
9
1.27%
2
9.09%
Sangjung Woo
8
1.13%
1
4.55%
Mark Brown
3
0.42%
1
4.55%
H Hartley Sweeten
2
0.28%
1
4.55%
Moritz Fischer
1
0.14%
1
4.55%
Total
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Directory: drivers/extcon

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