linux/drivers/input/misc/palmas-pwrbutton.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Texas Instruments' Palmas Power Button Input Driver
 *
 * Copyright (C) 2012-2014 Texas Instruments Incorporated - http://www.ti.com/
 *	Girish S Ghongdemath
 *	Nishanth Menon
 */

#include <linux/bitfield.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/palmas.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define PALMAS_LPK_TIME_MASK …
#define PALMAS_PWRON_DEBOUNCE_MASK …
#define PALMAS_PWR_KEY_Q_TIME_MS …

/**
 * struct palmas_pwron - Palmas power on data
 * @palmas:		pointer to palmas device
 * @input_dev:		pointer to input device
 * @input_work:		work for detecting release of key
 * @irq:		irq that we are hooked on to
 */
struct palmas_pwron { … };

/**
 * struct palmas_pwron_config - configuration of palmas power on
 * @long_press_time_val:	value for long press h/w shutdown event
 * @pwron_debounce_val:		value for debounce of power button
 */
struct palmas_pwron_config { … };

/**
 * palmas_power_button_work() - Detects the button release event
 * @work:	work item to detect button release
 */
static void palmas_power_button_work(struct work_struct *work)
{ … }

/**
 * pwron_irq() - button press isr
 * @irq:		irq
 * @palmas_pwron:	pwron struct
 *
 * Return: IRQ_HANDLED
 */
static irqreturn_t pwron_irq(int irq, void *palmas_pwron)
{ … }

/**
 * palmas_pwron_params_ofinit() - device tree parameter parser
 * @dev:	palmas button device
 * @config:	configuration params that this fills up
 */
static void palmas_pwron_params_ofinit(struct device *dev,
				       struct palmas_pwron_config *config)
{ … }

/**
 * palmas_pwron_probe() - probe
 * @pdev:	platform device for the button
 *
 * Return: 0 for successful probe else appropriate error
 */
static int palmas_pwron_probe(struct platform_device *pdev)
{ … }

/**
 * palmas_pwron_remove() - Cleanup on removal
 * @pdev:	platform device for the button
 *
 * Return: 0
 */
static void palmas_pwron_remove(struct platform_device *pdev)
{ … }

/**
 * palmas_pwron_suspend() - suspend handler
 * @dev:	power button device
 *
 * Cancel all pending work items for the power button, setup irq for wakeup
 *
 * Return: 0
 */
static int palmas_pwron_suspend(struct device *dev)
{ … }

/**
 * palmas_pwron_resume() - resume handler
 * @dev:	power button device
 *
 * Just disable the wakeup capability of irq here.
 *
 * Return: 0
 */
static int palmas_pwron_resume(struct device *dev)
{ … }

static DEFINE_SIMPLE_DEV_PM_OPS(palmas_pwron_pm,
				palmas_pwron_suspend, palmas_pwron_resume);

#ifdef CONFIG_OF
static const struct of_device_id of_palmas_pwr_match[] = …;

MODULE_DEVICE_TABLE(of, of_palmas_pwr_match);
#endif

static struct platform_driver palmas_pwron_driver = …;
module_platform_driver(…) …;

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