183 lines
4.4 KiB
C
Executable File
183 lines
4.4 KiB
C
Executable File
/*
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* Driver for simulating a mouse on GPIO lines.
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*
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* Copyright (C) 2007 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/input-polldev.h>
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#include <linux/gpio.h>
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#include <linux/gpio_mouse.h>
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/*
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* Timer function which is run every scan_ms ms when the device is opened.
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* The dev input variable is set to the the input_dev pointer.
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*/
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static void gpio_mouse_scan(struct input_polled_dev *dev)
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{
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struct gpio_mouse_platform_data *gpio = dev->private;
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struct input_dev *input = dev->input;
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int x, y;
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if (gpio->bleft >= 0)
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input_report_key(input, BTN_LEFT,
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gpio_get_value(gpio->bleft) ^ gpio->polarity);
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if (gpio->bmiddle >= 0)
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input_report_key(input, BTN_MIDDLE,
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gpio_get_value(gpio->bmiddle) ^ gpio->polarity);
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if (gpio->bright >= 0)
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input_report_key(input, BTN_RIGHT,
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gpio_get_value(gpio->bright) ^ gpio->polarity);
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x = (gpio_get_value(gpio->right) ^ gpio->polarity)
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- (gpio_get_value(gpio->left) ^ gpio->polarity);
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y = (gpio_get_value(gpio->down) ^ gpio->polarity)
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- (gpio_get_value(gpio->up) ^ gpio->polarity);
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input_report_rel(input, REL_X, x);
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input_report_rel(input, REL_Y, y);
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input_sync(input);
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}
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static int gpio_mouse_probe(struct platform_device *pdev)
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{
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struct gpio_mouse_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct input_polled_dev *input_poll;
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struct input_dev *input;
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int pin, i;
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int error;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data\n");
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error = -ENXIO;
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goto out;
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}
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if (pdata->scan_ms < 0) {
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dev_err(&pdev->dev, "invalid scan time\n");
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error = -EINVAL;
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goto out;
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}
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for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) {
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pin = pdata->pins[i];
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if (pin < 0) {
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if (i <= GPIO_MOUSE_PIN_RIGHT) {
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/* Mouse direction is required. */
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dev_err(&pdev->dev,
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"missing GPIO for directions\n");
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error = -EINVAL;
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goto out_free_gpios;
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}
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if (i == GPIO_MOUSE_PIN_BLEFT)
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dev_dbg(&pdev->dev, "no left button defined\n");
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} else {
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error = gpio_request(pin, "gpio_mouse");
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if (error) {
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dev_err(&pdev->dev, "fail %d pin (%d idx)\n",
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pin, i);
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goto out_free_gpios;
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}
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gpio_direction_input(pin);
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}
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}
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input_poll = input_allocate_polled_device();
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if (!input_poll) {
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dev_err(&pdev->dev, "not enough memory for input device\n");
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error = -ENOMEM;
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goto out_free_gpios;
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}
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platform_set_drvdata(pdev, input_poll);
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/* set input-polldev handlers */
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input_poll->private = pdata;
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input_poll->poll = gpio_mouse_scan;
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input_poll->poll_interval = pdata->scan_ms;
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input = input_poll->input;
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input->name = pdev->name;
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input->id.bustype = BUS_HOST;
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input->dev.parent = &pdev->dev;
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input_set_capability(input, EV_REL, REL_X);
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input_set_capability(input, EV_REL, REL_Y);
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if (pdata->bleft >= 0)
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input_set_capability(input, EV_KEY, BTN_LEFT);
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if (pdata->bmiddle >= 0)
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input_set_capability(input, EV_KEY, BTN_MIDDLE);
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if (pdata->bright >= 0)
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input_set_capability(input, EV_KEY, BTN_RIGHT);
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error = input_register_polled_device(input_poll);
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if (error) {
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dev_err(&pdev->dev, "could not register input device\n");
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goto out_free_polldev;
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}
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dev_dbg(&pdev->dev, "%d ms scan time, buttons: %s%s%s\n",
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pdata->scan_ms,
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pdata->bleft < 0 ? "" : "left ",
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pdata->bmiddle < 0 ? "" : "middle ",
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pdata->bright < 0 ? "" : "right");
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return 0;
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out_free_polldev:
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input_free_polled_device(input_poll);
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out_free_gpios:
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while (--i >= 0) {
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pin = pdata->pins[i];
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if (pin)
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gpio_free(pin);
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}
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out:
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return error;
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}
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static int gpio_mouse_remove(struct platform_device *pdev)
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{
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struct input_polled_dev *input = platform_get_drvdata(pdev);
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struct gpio_mouse_platform_data *pdata = input->private;
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int pin, i;
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input_unregister_polled_device(input);
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input_free_polled_device(input);
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for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) {
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pin = pdata->pins[i];
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if (pin >= 0)
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gpio_free(pin);
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}
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return 0;
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}
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static struct platform_driver gpio_mouse_device_driver = {
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.probe = gpio_mouse_probe,
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.remove = gpio_mouse_remove,
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.driver = {
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.name = "gpio_mouse",
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}
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};
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module_platform_driver(gpio_mouse_device_driver);
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MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
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MODULE_DESCRIPTION("GPIO mouse driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:gpio_mouse"); /* work with hotplug and coldplug */
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