maplemouse.c

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/*
 *  SEGA Dreamcast mouse driver
 *  Based on drivers/usb/usbmouse.c
 *
 *  Copyright (c) Yaegashi Takeshi, 2001
 *  Copyright (c) Adrian McMenamin, 2008 - 2009
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/maple.h>

MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
MODULE_DESCRIPTION("SEGA Dreamcast mouse driver");
MODULE_LICENSE("GPL");

struct dc_mouse {
    struct input_dev *dev;
    struct maple_device *mdev;
};

static void dc_mouse_callback(struct mapleq *mq)
{
    int buttons, relx, rely, relz;
    struct maple_device *mapledev = mq->dev;
    struct dc_mouse *mse = maple_get_drvdata(mapledev);
    struct input_dev *dev = mse->dev;
    unsigned char *res = mq->recvbuf->buf;

    buttons = ~res[8];
    relx = *(unsigned short *)(res + 12) - 512;
    rely = *(unsigned short *)(res + 14) - 512;
    relz = *(unsigned short *)(res + 16) - 512;

    input_report_key(dev, BTN_LEFT,   buttons & 4);
    input_report_key(dev, BTN_MIDDLE, buttons & 9);
    input_report_key(dev, BTN_RIGHT,  buttons & 2);
    input_report_rel(dev, REL_X,      relx);
    input_report_rel(dev, REL_Y,      rely);
    input_report_rel(dev, REL_WHEEL,  relz);
    input_sync(dev);
}

static int dc_mouse_open(struct input_dev *dev)
{
    struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));

    maple_getcond_callback(mse->mdev, dc_mouse_callback, HZ/50,
        MAPLE_FUNC_MOUSE);

    return 0;
}

static void dc_mouse_close(struct input_dev *dev)
{
    struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));

    maple_getcond_callback(mse->mdev, dc_mouse_callback, 0,
        MAPLE_FUNC_MOUSE);
}

/* allow the mouse to be used */
static int __devinit probe_maple_mouse(struct device *dev)
{
    struct maple_device *mdev = to_maple_dev(dev);
    struct maple_driver *mdrv = to_maple_driver(dev->driver);
    int error;
    struct input_dev *input_dev;
    struct dc_mouse *mse;

    mse = kzalloc(sizeof(struct dc_mouse), GFP_KERNEL);
    if (!mse) {
        error = -ENOMEM;
        goto fail;
    }

    input_dev = input_allocate_device();
    if (!input_dev) {
        error = -ENOMEM;
        goto fail_nomem;
    }

    mse->dev = input_dev;
    mse->mdev = mdev;

    input_set_drvdata(input_dev, mse);
    input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
    input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
        BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
    input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
        BIT_MASK(REL_WHEEL);
    input_dev->open = dc_mouse_open;
    input_dev->close = dc_mouse_close;
    input_dev->name = mdev->product_name;
    input_dev->id.bustype = BUS_HOST;
    error = input_register_device(input_dev);
    if (error)
        goto fail_register;

    mdev->driver = mdrv;
    maple_set_drvdata(mdev, mse);

    return error;

fail_register:
    input_free_device(input_dev);
fail_nomem:
    kfree(mse);
fail:
    return error;
}

static int __devexit remove_maple_mouse(struct device *dev)
{
    struct maple_device *mdev = to_maple_dev(dev);
    struct dc_mouse *mse = maple_get_drvdata(mdev);

    mdev->callback = NULL;
    input_unregister_device(mse->dev);
    maple_set_drvdata(mdev, NULL);
    kfree(mse);

    return 0;
}

static struct maple_driver dc_mouse_driver = {
    .function = MAPLE_FUNC_MOUSE,
    .drv = {
        .name = "Dreamcast_mouse",
        .probe = probe_maple_mouse,
        .remove = __devexit_p(remove_maple_mouse),
    },
};

static int __init dc_mouse_init(void)
{
    return maple_driver_register(&dc_mouse_driver);
}

static void __exit dc_mouse_exit(void)
{
    maple_driver_unregister(&dc_mouse_driver);
}

module_init(dc_mouse_init);
module_exit(dc_mouse_exit);