1 files changed, 196 insertions, 0 deletions

diff --git a/drivers/input/mouse/gpio_mouse.c b/drivers/input/mouse/gpio_mouse.c
new file mode 100644
index 000000000000..0936d6ba015c
--- /dev/null
+++ b/drivers/input/mouse/gpio_mouse.c
@@ -0,0 +1,196 @@
+/*
+ * 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");