linux/drivers/extcon/extcon-gpio.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
 *
 * Copyright (C) 2008 Google, Inc.
 * Author: Mike Lockwood <[email protected]>
 *
 * Modified by MyungJoo Ham <[email protected]> to support extcon
 * (originally switch class is supported)
 */

#include <linux/devm-helpers.h>
#include <linux/extcon-provider.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 - A simple GPIO-controlled extcon device state container.
 * @edev:		Extcon device.
 * @work:		Work fired by the interrupt.
 * @debounce_jiffies:	Number of jiffies to wait for the GPIO to stabilize, from the debounce
 *			value.
 * @gpiod:		GPIO descriptor for this external connector.
 * @extcon_id:		The unique id of specific external connector.
 * @debounce:		Debounce time for GPIO IRQ in ms.
 * @check_on_resume:	Boolean describing whether to check the state of gpio
 *			while resuming from sleep.
 */
struct gpio_extcon_data { … };

static void gpio_extcon_work(struct work_struct *work)
{ … }

static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
{ … }

static int gpio_extcon_probe(struct platform_device *pdev)
{ … }

#ifdef CONFIG_PM_SLEEP
static int gpio_extcon_resume(struct device *dev)
{ … }
#endif

static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume);

static struct platform_driver gpio_extcon_driver = …;

module_platform_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;