linux/drivers/input/mouse/gpio_mouse.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for simulating a mouse on GPIO lines.
 *
 * Copyright (C) 2007 Atmel Corporation
 * Copyright (C) 2017 Linus Walleij <[email protected]>
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/gpio/consumer.h>
#include <linux/property.h>
#include <linux/of.h>

/**
 * struct gpio_mouse
 * @scan_ms: the scan interval in milliseconds.
 * @up: GPIO line for up value.
 * @down: GPIO line for down value.
 * @left: GPIO line for left value.
 * @right: GPIO line for right value.
 * @bleft: GPIO line for left button.
 * @bmiddle: GPIO line for middle button.
 * @bright: GPIO line for right button.
 *
 * This struct must be added to the platform_device in the board code.
 * It is used by the gpio_mouse driver to setup GPIO lines and to
 * calculate mouse movement.
 */
struct gpio_mouse { … };

/*
 * Timer function which is run every scan_ms ms when the device is opened.
 * The dev input variable is set to the input_dev pointer.
 */
static void gpio_mouse_scan(struct input_dev *input)
{ … }

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

static const struct of_device_id gpio_mouse_of_match[] = …;
MODULE_DEVICE_TABLE(of, gpio_mouse_of_match);

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

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
MODULE_ALIAS(…) …; /* work with hotplug and coldplug */