Orange Pi5 kernel

// 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 <linus.walleij@linaro.org>
 */
 
#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 {
<------>u32 scan_ms;
<------>struct gpio_desc *up;
<------>struct gpio_desc *down;
<------>struct gpio_desc *left;
<------>struct gpio_desc *right;
<------>struct gpio_desc *bleft;
<------>struct gpio_desc *bmiddle;
<------>struct gpio_desc *bright;
};
 
/*
 * Timer function which is run every scan_ms ms when the device is opened.
 * The dev input variable is set to the the input_dev pointer.
 */
static void gpio_mouse_scan(struct input_dev *input)
{
<------>struct gpio_mouse *gpio = input_get_drvdata(input);
<------>int x, y;
 
<------>if (gpio->bleft)
<------><------>input_report_key(input, BTN_LEFT,
<------><------><------><------> gpiod_get_value(gpio->bleft));
<------>if (gpio->bmiddle)
<------><------>input_report_key(input, BTN_MIDDLE,
<------><------><------><------> gpiod_get_value(gpio->bmiddle));
<------>if (gpio->bright)
<------><------>input_report_key(input, BTN_RIGHT,
<------><------><------><------> gpiod_get_value(gpio->bright));
 
<------>x = gpiod_get_value(gpio->right) - gpiod_get_value(gpio->left);
<------>y = gpiod_get_value(gpio->down) - gpiod_get_value(gpio->up);
 
<------>input_report_rel(input, REL_X, x);
<------>input_report_rel(input, REL_Y, y);
<------>input_sync(input);
}
 
static int gpio_mouse_probe(struct platform_device *pdev)
{
<------>struct device *dev = &pdev->dev;
<------>struct gpio_mouse *gmouse;
<------>struct input_dev *input;
<------>int error;
 
<------>gmouse = devm_kzalloc(dev, sizeof(*gmouse), GFP_KERNEL);
<------>if (!gmouse)
<------><------>return -ENOMEM;
 
<------>/* Assign some default scanning time */
<------>error = device_property_read_u32(dev, "scan-interval-ms",
<------><------><------><------><------> &gmouse->scan_ms);
<------>if (error || gmouse->scan_ms == 0) {
<------><------>dev_warn(dev, "invalid scan time, set to 50 ms\n");
<------><------>gmouse->scan_ms = 50;
<------>}
 
<------>gmouse->up = devm_gpiod_get(dev, "up", GPIOD_IN);
<------>if (IS_ERR(gmouse->up))
<------><------>return PTR_ERR(gmouse->up);
<------>gmouse->down = devm_gpiod_get(dev, "down", GPIOD_IN);
<------>if (IS_ERR(gmouse->down))
<------><------>return PTR_ERR(gmouse->down);
<------>gmouse->left = devm_gpiod_get(dev, "left", GPIOD_IN);
<------>if (IS_ERR(gmouse->left))
<------><------>return PTR_ERR(gmouse->left);
<------>gmouse->right = devm_gpiod_get(dev, "right", GPIOD_IN);
<------>if (IS_ERR(gmouse->right))
<------><------>return PTR_ERR(gmouse->right);
 
<------>gmouse->bleft = devm_gpiod_get_optional(dev, "button-left", GPIOD_IN);
<------>if (IS_ERR(gmouse->bleft))
<------><------>return PTR_ERR(gmouse->bleft);
<------>gmouse->bmiddle = devm_gpiod_get_optional(dev, "button-middle",
<------><------><------><------><------><------>  GPIOD_IN);
<------>if (IS_ERR(gmouse->bmiddle))
<------><------>return PTR_ERR(gmouse->bmiddle);
<------>gmouse->bright = devm_gpiod_get_optional(dev, "button-right",
<------><------><------><------><------><------> GPIOD_IN);
<------>if (IS_ERR(gmouse->bright))
<------><------>return PTR_ERR(gmouse->bright);
 
<------>input = devm_input_allocate_device(dev);
<------>if (!input)
<------><------>return -ENOMEM;
 
<------>input->name = pdev->name;
<------>input->id.bustype = BUS_HOST;
 
<------>input_set_drvdata(input, gmouse);
 
<------>input_set_capability(input, EV_REL, REL_X);
<------>input_set_capability(input, EV_REL, REL_Y);
<------>if (gmouse->bleft)
<------><------>input_set_capability(input, EV_KEY, BTN_LEFT);
<------>if (gmouse->bmiddle)
<------><------>input_set_capability(input, EV_KEY, BTN_MIDDLE);
<------>if (gmouse->bright)
<------><------>input_set_capability(input, EV_KEY, BTN_RIGHT);
 
<------>error = input_setup_polling(input, gpio_mouse_scan);
<------>if (error)
<------><------>return error;
 
<------>input_set_poll_interval(input, gmouse->scan_ms);
 
<------>error = input_register_device(input);
<------>if (error) {
<------><------>dev_err(dev, "could not register input device\n");
<------><------>return error;
<------>}
 
<------>dev_dbg(dev, "%d ms scan time, buttons: %s%s%s\n",
<------><------>gmouse->scan_ms,
<------><------>gmouse->bleft ? "" : "left ",
<------><------>gmouse->bmiddle ? "" : "middle ",
<------><------>gmouse->bright ? "" : "right");
 
<------>return 0;
}
 
static const struct of_device_id gpio_mouse_of_match[] = {
<------>{ .compatible = "gpio-mouse", },
<------>{ },
};
MODULE_DEVICE_TABLE(of, gpio_mouse_of_match);
 
static struct platform_driver gpio_mouse_device_driver = {
<------>.probe		= gpio_mouse_probe,
<------>.driver		= {
<------><------>.name	= "gpio_mouse",
<------><------>.of_match_table = gpio_mouse_of_match,
<------>}
};
module_platform_driver(gpio_mouse_device_driver);
 
MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
MODULE_DESCRIPTION("GPIO mouse driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:gpio_mouse"); /* work with hotplug and coldplug */