--- /dev/null
+/*
+ * 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/init.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/input-polldev.h>
+#include <linux/gpio_mouse.h>
+
+#include <asm/gpio.h>
+
+/*
+ * Timer function which is run every scan_ms ms when the device is opened.
+ * The dev input varaible 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);
+}
+
+static int __init gpio_mouse_probe(struct platform_device *pdev)
+{
+ struct gpio_mouse_platform_data *pdata = pdev->dev.platform_data;
+ 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);
+ platform_set_drvdata(pdev, NULL);
+
+ out_free_gpios:
+ while (--i >= 0) {
+ pin = pdata->pins[i];
+ if (pin)
+ gpio_free(pin);
+ }
+ out:
+ return error;
+}
+
+static int __devexit 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);
+ }
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+struct platform_driver gpio_mouse_device_driver = {
+ .remove = __devexit_p(gpio_mouse_remove),
+ .driver = {
+ .name = "gpio_mouse",
+ }
+};
+
+static int __init gpio_mouse_init(void)
+{
+ return platform_driver_probe(&gpio_mouse_device_driver,
+ gpio_mouse_probe);
+}
+module_init(gpio_mouse_init);
+
+static void __exit gpio_mouse_exit(void)
+{
+ platform_driver_unregister(&gpio_mouse_device_driver);
+}
+module_exit(gpio_mouse_exit);
+
+MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
+MODULE_DESCRIPTION("GPIO mouse driver");
+MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * 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.
+ */
+
+#ifndef _GPIO_MOUSE_H
+#define _GPIO_MOUSE_H
+
+#define GPIO_MOUSE_POLARITY_ACT_HIGH 0x00
+#define GPIO_MOUSE_POLARITY_ACT_LOW 0x01
+
+#define GPIO_MOUSE_PIN_UP 0
+#define GPIO_MOUSE_PIN_DOWN 1
+#define GPIO_MOUSE_PIN_LEFT 2
+#define GPIO_MOUSE_PIN_RIGHT 3
+#define GPIO_MOUSE_PIN_BLEFT 4
+#define GPIO_MOUSE_PIN_BMIDDLE 5
+#define GPIO_MOUSE_PIN_BRIGHT 6
+#define GPIO_MOUSE_PIN_MAX 7
+
+/**
+ * struct gpio_mouse_platform_data
+ * @scan_ms: integer in ms specifying the scan periode.
+ * @polarity: Pin polarity, active high or low.
+ * @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_platform_data {
+ int scan_ms;
+ int polarity;
+
+ union {
+ struct {
+ int up;
+ int down;
+ int left;
+ int right;
+
+ int bleft;
+ int bmiddle;
+ int bright;
+ };
+ int pins[GPIO_MOUSE_PIN_MAX];
+ };
+};
+
+#endif /* _GPIO_MOUSE_H */
projects / linux-2.6-omap-h63xx.git / commitdiff