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Release 4.11 drivers/input/mouse/gpio_mouse.c

/*
 * Driver for simulating a mouse on GPIO lines.
 *
 * Copyright (C) 2007 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input-polldev.h>
#include <linux/gpio.h>
#include <linux/gpio_mouse.h>


/*
 * 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_polled_dev *dev) { struct gpio_mouse_platform_data *gpio = dev->private; struct input_dev *input = dev->input; int x, y; if (gpio->bleft >= 0) input_report_key(input, BTN_LEFT, gpio_get_value(gpio->bleft) ^ gpio->polarity); if (gpio->bmiddle >= 0) input_report_key(input, BTN_MIDDLE, gpio_get_value(gpio->bmiddle) ^ gpio->polarity); if (gpio->bright >= 0) input_report_key(input, BTN_RIGHT, gpio_get_value(gpio->bright) ^ gpio->polarity); x = (gpio_get_value(gpio->right) ^ gpio->polarity) - (gpio_get_value(gpio->left) ^ gpio->polarity); y = (gpio_get_value(gpio->down) ^ gpio->polarity) - (gpio_get_value(gpio->up) ^ gpio->polarity); input_report_rel(input, REL_X, x); input_report_rel(input, REL_Y, y); input_sync(input); }

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Hans-Christian Noren Egtvedt191100.00%1100.00%
Total191100.00%1100.00%


static int gpio_mouse_probe(struct platform_device *pdev) { struct gpio_mouse_platform_data *pdata = dev_get_platdata(&pdev->dev); struct input_polled_dev *input_poll; struct input_dev *input; int pin, i; int error; if (!pdata) { dev_err(&pdev->dev, "no platform data\n"); error = -ENXIO; goto out; } if (pdata->scan_ms < 0) { dev_err(&pdev->dev, "invalid scan time\n"); error = -EINVAL; goto out; } for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) { pin = pdata->pins[i]; if (pin < 0) { if (i <= GPIO_MOUSE_PIN_RIGHT) { /* Mouse direction is required. */ dev_err(&pdev->dev, "missing GPIO for directions\n"); error = -EINVAL; goto out_free_gpios; } if (i == GPIO_MOUSE_PIN_BLEFT) dev_dbg(&pdev->dev, "no left button defined\n"); } else { error = gpio_request(pin, "gpio_mouse"); if (error) { dev_err(&pdev->dev, "fail %d pin (%d idx)\n", pin, i); goto out_free_gpios; } gpio_direction_input(pin); } } input_poll = input_allocate_polled_device(); if (!input_poll) { dev_err(&pdev->dev, "not enough memory for input device\n"); error = -ENOMEM; goto out_free_gpios; } platform_set_drvdata(pdev, input_poll); /* set input-polldev handlers */ input_poll->private = pdata; input_poll->poll = gpio_mouse_scan; input_poll->poll_interval = pdata->scan_ms; input = input_poll->input; input->name = pdev->name; input->id.bustype = BUS_HOST; input->dev.parent = &pdev->dev; input_set_capability(input, EV_REL, REL_X); input_set_capability(input, EV_REL, REL_Y); if (pdata->bleft >= 0) input_set_capability(input, EV_KEY, BTN_LEFT); if (pdata->bmiddle >= 0) input_set_capability(input, EV_KEY, BTN_MIDDLE); if (pdata->bright >= 0) input_set_capability(input, EV_KEY, BTN_RIGHT); error = input_register_polled_device(input_poll); if (error) { dev_err(&pdev->dev, "could not register input device\n"); goto out_free_polldev; } dev_dbg(&pdev->dev, "%d ms scan time, buttons: %s%s%s\n", pdata->scan_ms, pdata->bleft < 0 ? "" : "left ", pdata->bmiddle < 0 ? "" : "middle ", pdata->bright < 0 ? "" : "right"); return 0; out_free_polldev: input_free_polled_device(input_poll); out_free_gpios: while (--i >= 0) { pin = pdata->pins[i]; if (pin) gpio_free(pin); } out: return error; }

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PersonTokensPropCommitsCommitProp
Hans-Christian Noren Egtvedt48099.17%150.00%
Jingoo Han40.83%150.00%
Total484100.00%2100.00%


static int gpio_mouse_remove(struct platform_device *pdev) { struct input_polled_dev *input = platform_get_drvdata(pdev); struct gpio_mouse_platform_data *pdata = input->private; int pin, i; input_unregister_polled_device(input); input_free_polled_device(input); for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) { pin = pdata->pins[i]; if (pin >= 0) gpio_free(pin); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Hans-Christian Noren Egtvedt83100.00%1100.00%
Total83100.00%1100.00%

static struct platform_driver gpio_mouse_device_driver = { .probe = gpio_mouse_probe, .remove = gpio_mouse_remove, .driver = { .name = "gpio_mouse", } }; 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 */

Overall Contributors

PersonTokensPropCommitsCommitProp
Hans-Christian Noren Egtvedt80897.58%225.00%
Saeed Bishara111.33%112.50%
Jingoo Han40.48%112.50%
Mark Brown20.24%112.50%
Uwe Kleine-König10.12%112.50%
JJ Ding10.12%112.50%
Roel Kluin10.12%112.50%
Total828100.00%8100.00%
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