hid-roccat-koneplus.c

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/*
 * Roccat Kone[+] driver for Linux
 *
 * Copyright (c) 2010 Stefan Achatz <[email protected]>
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

/*
 * Roccat Kone[+] is an updated/improved version of the Kone with more memory
 * and functionality and without the non-standard behaviours the Kone had.
 */

#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/hid-roccat.h>
#include "hid-ids.h"
#include "hid-roccat-common.h"
#include "hid-roccat-koneplus.h"

static uint profile_numbers[5] = {0, 1, 2, 3, 4};

static struct class *koneplus_class;

static void koneplus_profile_activated(struct koneplus_device *koneplus,
        uint new_profile)
{
    koneplus->actual_profile = new_profile;
}

static int koneplus_send_control(struct usb_device *usb_dev, uint value,
        enum koneplus_control_requests request)
{
    struct roccat_common2_control control;

    if ((request == KONEPLUS_CONTROL_REQUEST_PROFILE_SETTINGS ||
            request == KONEPLUS_CONTROL_REQUEST_PROFILE_BUTTONS) &&
            value > 4)
        return -EINVAL;

    control.command = ROCCAT_COMMON_COMMAND_CONTROL;
    control.value = value;
    control.request = request;

    return roccat_common2_send_with_status(usb_dev,
            ROCCAT_COMMON_COMMAND_CONTROL,
            &control, sizeof(struct roccat_common2_control));
}

static int koneplus_get_info(struct usb_device *usb_dev,
        struct koneplus_info *buf)
{
    return roccat_common2_receive(usb_dev, KONEPLUS_COMMAND_INFO,
            buf, sizeof(struct koneplus_info));
}

static int koneplus_get_profile_settings(struct usb_device *usb_dev,
        struct koneplus_profile_settings *buf, uint number)
{
    int retval;

    retval = koneplus_send_control(usb_dev, number,
            KONEPLUS_CONTROL_REQUEST_PROFILE_SETTINGS);
    if (retval)
        return retval;

    return roccat_common2_receive(usb_dev, KONEPLUS_COMMAND_PROFILE_SETTINGS,
            buf, sizeof(struct koneplus_profile_settings));
}

static int koneplus_set_profile_settings(struct usb_device *usb_dev,
        struct koneplus_profile_settings const *settings)
{
    return roccat_common2_send_with_status(usb_dev,
            KONEPLUS_COMMAND_PROFILE_SETTINGS,
            settings, sizeof(struct koneplus_profile_settings));
}

static int koneplus_get_profile_buttons(struct usb_device *usb_dev,
        struct koneplus_profile_buttons *buf, int number)
{
    int retval;

    retval = koneplus_send_control(usb_dev, number,
            KONEPLUS_CONTROL_REQUEST_PROFILE_BUTTONS);
    if (retval)
        return retval;

    return roccat_common2_receive(usb_dev, KONEPLUS_COMMAND_PROFILE_BUTTONS,
            buf, sizeof(struct koneplus_profile_buttons));
}

static int koneplus_set_profile_buttons(struct usb_device *usb_dev,
        struct koneplus_profile_buttons const *buttons)
{
    return roccat_common2_send_with_status(usb_dev,
            KONEPLUS_COMMAND_PROFILE_BUTTONS,
            buttons, sizeof(struct koneplus_profile_buttons));
}

/* retval is 0-4 on success, < 0 on error */
static int koneplus_get_actual_profile(struct usb_device *usb_dev)
{
    struct koneplus_actual_profile buf;
    int retval;

    retval = roccat_common2_receive(usb_dev, KONEPLUS_COMMAND_ACTUAL_PROFILE,
            &buf, sizeof(struct koneplus_actual_profile));

    return retval ? retval : buf.actual_profile;
}

static int koneplus_set_actual_profile(struct usb_device *usb_dev,
        int new_profile)
{
    struct koneplus_actual_profile buf;

    buf.command = KONEPLUS_COMMAND_ACTUAL_PROFILE;
    buf.size = sizeof(struct koneplus_actual_profile);
    buf.actual_profile = new_profile;

    return roccat_common2_send_with_status(usb_dev,
            KONEPLUS_COMMAND_ACTUAL_PROFILE,
            &buf, sizeof(struct koneplus_actual_profile));
}

static ssize_t koneplus_sysfs_read(struct file *fp, struct kobject *kobj,
        char *buf, loff_t off, size_t count,
        size_t real_size, uint command)
{
    struct device *dev =
            container_of(kobj, struct device, kobj)->parent->parent;
    struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));
    struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
    int retval;

    if (off >= real_size)
        return 0;

    if (off != 0 || count != real_size)
        return -EINVAL;

    mutex_lock(&koneplus->koneplus_lock);
    retval = roccat_common2_receive(usb_dev, command, buf, real_size);
    mutex_unlock(&koneplus->koneplus_lock);

    if (retval)
        return retval;

    return real_size;
}

static ssize_t koneplus_sysfs_write(struct file *fp, struct kobject *kobj,
        void const *buf, loff_t off, size_t count,
        size_t real_size, uint command)
{
    struct device *dev =
            container_of(kobj, struct device, kobj)->parent->parent;
    struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));
    struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
    int retval;

    if (off != 0 || count != real_size)
        return -EINVAL;

    mutex_lock(&koneplus->koneplus_lock);
    retval = roccat_common2_send_with_status(usb_dev, command,
            buf, real_size);
    mutex_unlock(&koneplus->koneplus_lock);

    if (retval)
        return retval;

    return real_size;
}

static ssize_t koneplus_sysfs_write_talk(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    return koneplus_sysfs_write(fp, kobj, buf, off, count,
            sizeof(struct koneplus_talk), KONEPLUS_COMMAND_TALK);
}

static ssize_t koneplus_sysfs_write_macro(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    return koneplus_sysfs_write(fp, kobj, buf, off, count,
            sizeof(struct koneplus_macro), KONEPLUS_COMMAND_MACRO);
}

static ssize_t koneplus_sysfs_read_sensor(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    return koneplus_sysfs_read(fp, kobj, buf, off, count,
            sizeof(struct koneplus_sensor), KONEPLUS_COMMAND_SENSOR);
}

static ssize_t koneplus_sysfs_write_sensor(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    return koneplus_sysfs_write(fp, kobj, buf, off, count,
            sizeof(struct koneplus_sensor), KONEPLUS_COMMAND_SENSOR);
}

static ssize_t koneplus_sysfs_write_tcu(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    return koneplus_sysfs_write(fp, kobj, buf, off, count,
            sizeof(struct koneplus_tcu), KONEPLUS_COMMAND_TCU);
}

static ssize_t koneplus_sysfs_read_tcu_image(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    return koneplus_sysfs_read(fp, kobj, buf, off, count,
            sizeof(struct koneplus_tcu_image), KONEPLUS_COMMAND_TCU);
}

static ssize_t koneplus_sysfs_read_profilex_settings(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    struct device *dev =
            container_of(kobj, struct device, kobj)->parent->parent;
    struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));

    if (off >= sizeof(struct koneplus_profile_settings))
        return 0;

    if (off + count > sizeof(struct koneplus_profile_settings))
        count = sizeof(struct koneplus_profile_settings) - off;

    mutex_lock(&koneplus->koneplus_lock);
    memcpy(buf, ((char const *)&koneplus->profile_settings[*(uint *)(attr->private)]) + off,
            count);
    mutex_unlock(&koneplus->koneplus_lock);

    return count;
}

static ssize_t koneplus_sysfs_write_profile_settings(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    struct device *dev =
            container_of(kobj, struct device, kobj)->parent->parent;
    struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));
    struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
    int retval = 0;
    int difference;
    int profile_number;
    struct koneplus_profile_settings *profile_settings;

    if (off != 0 || count != sizeof(struct koneplus_profile_settings))
        return -EINVAL;

    profile_number = ((struct koneplus_profile_settings const *)buf)->number;
    profile_settings = &koneplus->profile_settings[profile_number];

    mutex_lock(&koneplus->koneplus_lock);
    difference = memcmp(buf, profile_settings,
            sizeof(struct koneplus_profile_settings));
    if (difference) {
        retval = koneplus_set_profile_settings(usb_dev,
                (struct koneplus_profile_settings const *)buf);
        if (!retval)
            memcpy(profile_settings, buf,
                    sizeof(struct koneplus_profile_settings));
    }
    mutex_unlock(&koneplus->koneplus_lock);

    if (retval)
        return retval;

    return sizeof(struct koneplus_profile_settings);
}

static ssize_t koneplus_sysfs_read_profilex_buttons(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    struct device *dev =
            container_of(kobj, struct device, kobj)->parent->parent;
    struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));

    if (off >= sizeof(struct koneplus_profile_buttons))
        return 0;

    if (off + count > sizeof(struct koneplus_profile_buttons))
        count = sizeof(struct koneplus_profile_buttons) - off;

    mutex_lock(&koneplus->koneplus_lock);
    memcpy(buf, ((char const *)&koneplus->profile_buttons[*(uint *)(attr->private)]) + off,
            count);
    mutex_unlock(&koneplus->koneplus_lock);

    return count;
}

static ssize_t koneplus_sysfs_write_profile_buttons(struct file *fp,
        struct kobject *kobj, struct bin_attribute *attr, char *buf,
        loff_t off, size_t count)
{
    struct device *dev =
            container_of(kobj, struct device, kobj)->parent->parent;
    struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));
    struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
    int retval = 0;
    int difference;
    uint profile_number;
    struct koneplus_profile_buttons *profile_buttons;

    if (off != 0 || count != sizeof(struct koneplus_profile_buttons))
        return -EINVAL;

    profile_number = ((struct koneplus_profile_buttons const *)buf)->number;
    profile_buttons = &koneplus->profile_buttons[profile_number];

    mutex_lock(&koneplus->koneplus_lock);
    difference = memcmp(buf, profile_buttons,
            sizeof(struct koneplus_profile_buttons));
    if (difference) {
        retval = koneplus_set_profile_buttons(usb_dev,
                (struct koneplus_profile_buttons const *)buf);
        if (!retval)
            memcpy(profile_buttons, buf,
                    sizeof(struct koneplus_profile_buttons));
    }
    mutex_unlock(&koneplus->koneplus_lock);

    if (retval)
        return retval;

    return sizeof(struct koneplus_profile_buttons);
}

static ssize_t koneplus_sysfs_show_actual_profile(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    struct koneplus_device *koneplus =
            hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
    return snprintf(buf, PAGE_SIZE, "%d\n", koneplus->actual_profile);
}

static ssize_t koneplus_sysfs_set_actual_profile(struct device *dev,
        struct device_attribute *attr, char const *buf, size_t size)
{
    struct koneplus_device *koneplus;
    struct usb_device *usb_dev;
    unsigned long profile;
    int retval;
    struct koneplus_roccat_report roccat_report;

    dev = dev->parent->parent;
    koneplus = hid_get_drvdata(dev_get_drvdata(dev));
    usb_dev = interface_to_usbdev(to_usb_interface(dev));

    retval = strict_strtoul(buf, 10, &profile);
    if (retval)
        return retval;

    if (profile > 4)
        return -EINVAL;

    mutex_lock(&koneplus->koneplus_lock);

    retval = koneplus_set_actual_profile(usb_dev, profile);
    if (retval) {
        mutex_unlock(&koneplus->koneplus_lock);
        return retval;
    }

    koneplus_profile_activated(koneplus, profile);

    roccat_report.type = KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_PROFILE;
    roccat_report.data1 = profile + 1;
    roccat_report.data2 = 0;
    roccat_report.profile = profile + 1;
    roccat_report_event(koneplus->chrdev_minor,
            (uint8_t const *)&roccat_report);

    mutex_unlock(&koneplus->koneplus_lock);

    return size;
}

static ssize_t koneplus_sysfs_show_firmware_version(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    struct koneplus_device *koneplus =
            hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
    return snprintf(buf, PAGE_SIZE, "%d\n", koneplus->info.firmware_version);
}

static struct device_attribute koneplus_attributes[] = {
    __ATTR(actual_profile, 0660,
            koneplus_sysfs_show_actual_profile,
            koneplus_sysfs_set_actual_profile),
    __ATTR(startup_profile, 0660,
            koneplus_sysfs_show_actual_profile,
            koneplus_sysfs_set_actual_profile),
    __ATTR(firmware_version, 0440,
            koneplus_sysfs_show_firmware_version, NULL),
    __ATTR_NULL
};

static struct bin_attribute koneplus_bin_attributes[] = {
    {
        .attr = { .name = "sensor", .mode = 0660 },
        .size = sizeof(struct koneplus_sensor),
        .read = koneplus_sysfs_read_sensor,
        .write = koneplus_sysfs_write_sensor
    },
    {
        .attr = { .name = "tcu", .mode = 0220 },
        .size = sizeof(struct koneplus_tcu),
        .write = koneplus_sysfs_write_tcu
    },
    {
        .attr = { .name = "tcu_image", .mode = 0440 },
        .size = sizeof(struct koneplus_tcu_image),
        .read = koneplus_sysfs_read_tcu_image
    },
    {
        .attr = { .name = "profile_settings", .mode = 0220 },
        .size = sizeof(struct koneplus_profile_settings),
        .write = koneplus_sysfs_write_profile_settings
    },
    {
        .attr = { .name = "profile1_settings", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_settings),
        .read = koneplus_sysfs_read_profilex_settings,
        .private = &profile_numbers[0]
    },
    {
        .attr = { .name = "profile2_settings", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_settings),
        .read = koneplus_sysfs_read_profilex_settings,
        .private = &profile_numbers[1]
    },
    {
        .attr = { .name = "profile3_settings", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_settings),
        .read = koneplus_sysfs_read_profilex_settings,
        .private = &profile_numbers[2]
    },
    {
        .attr = { .name = "profile4_settings", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_settings),
        .read = koneplus_sysfs_read_profilex_settings,
        .private = &profile_numbers[3]
    },
    {
        .attr = { .name = "profile5_settings", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_settings),
        .read = koneplus_sysfs_read_profilex_settings,
        .private = &profile_numbers[4]
    },
    {
        .attr = { .name = "profile_buttons", .mode = 0220 },
        .size = sizeof(struct koneplus_profile_buttons),
        .write = koneplus_sysfs_write_profile_buttons
    },
    {
        .attr = { .name = "profile1_buttons", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_buttons),
        .read = koneplus_sysfs_read_profilex_buttons,
        .private = &profile_numbers[0]
    },
    {
        .attr = { .name = "profile2_buttons", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_buttons),
        .read = koneplus_sysfs_read_profilex_buttons,
        .private = &profile_numbers[1]
    },
    {
        .attr = { .name = "profile3_buttons", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_buttons),
        .read = koneplus_sysfs_read_profilex_buttons,
        .private = &profile_numbers[2]
    },
    {
        .attr = { .name = "profile4_buttons", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_buttons),
        .read = koneplus_sysfs_read_profilex_buttons,
        .private = &profile_numbers[3]
    },
    {
        .attr = { .name = "profile5_buttons", .mode = 0440 },
        .size = sizeof(struct koneplus_profile_buttons),
        .read = koneplus_sysfs_read_profilex_buttons,
        .private = &profile_numbers[4]
    },
    {
        .attr = { .name = "macro", .mode = 0220 },
        .size = sizeof(struct koneplus_macro),
        .write = koneplus_sysfs_write_macro
    },
    {
        .attr = { .name = "talk", .mode = 0220 },
        .size = sizeof(struct koneplus_talk),
        .write = koneplus_sysfs_write_talk
    },
    __ATTR_NULL
};

static int koneplus_init_koneplus_device_struct(struct usb_device *usb_dev,
        struct koneplus_device *koneplus)
{
    int retval, i;
    static uint wait = 200;

    mutex_init(&koneplus->koneplus_lock);

    retval = koneplus_get_info(usb_dev, &koneplus->info);
    if (retval)
        return retval;

    for (i = 0; i < 5; ++i) {
        msleep(wait);
        retval = koneplus_get_profile_settings(usb_dev,
                &koneplus->profile_settings[i], i);
        if (retval)
            return retval;

        msleep(wait);
        retval = koneplus_get_profile_buttons(usb_dev,
                &koneplus->profile_buttons[i], i);
        if (retval)
            return retval;
    }

    msleep(wait);
    retval = koneplus_get_actual_profile(usb_dev);
    if (retval < 0)
        return retval;
    koneplus_profile_activated(koneplus, retval);

    return 0;
}

static int koneplus_init_specials(struct hid_device *hdev)
{
    struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
    struct usb_device *usb_dev = interface_to_usbdev(intf);
    struct koneplus_device *koneplus;
    int retval;

    if (intf->cur_altsetting->desc.bInterfaceProtocol
            == USB_INTERFACE_PROTOCOL_MOUSE) {

        koneplus = kzalloc(sizeof(*koneplus), GFP_KERNEL);
        if (!koneplus) {
            hid_err(hdev, "can't alloc device descriptor\n");
            return -ENOMEM;
        }
        hid_set_drvdata(hdev, koneplus);

        retval = koneplus_init_koneplus_device_struct(usb_dev, koneplus);
        if (retval) {
            hid_err(hdev, "couldn't init struct koneplus_device\n");
            goto exit_free;
        }

        retval = roccat_connect(koneplus_class, hdev,
                sizeof(struct koneplus_roccat_report));
        if (retval < 0) {
            hid_err(hdev, "couldn't init char dev\n");
        } else {
            koneplus->chrdev_minor = retval;
            koneplus->roccat_claimed = 1;
        }
    } else {
        hid_set_drvdata(hdev, NULL);
    }

    return 0;
exit_free:
    kfree(koneplus);
    return retval;
}

static void koneplus_remove_specials(struct hid_device *hdev)
{
    struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
    struct koneplus_device *koneplus;

    if (intf->cur_altsetting->desc.bInterfaceProtocol
            == USB_INTERFACE_PROTOCOL_MOUSE) {
        koneplus = hid_get_drvdata(hdev);
        if (koneplus->roccat_claimed)
            roccat_disconnect(koneplus->chrdev_minor);
        kfree(koneplus);
    }
}

static int koneplus_probe(struct hid_device *hdev,
        const struct hid_device_id *id)
{
    int retval;

    retval = hid_parse(hdev);
    if (retval) {
        hid_err(hdev, "parse failed\n");
        goto exit;
    }

    retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
    if (retval) {
        hid_err(hdev, "hw start failed\n");
        goto exit;
    }

    retval = koneplus_init_specials(hdev);
    if (retval) {
        hid_err(hdev, "couldn't install mouse\n");
        goto exit_stop;
    }

    return 0;

exit_stop:
    hid_hw_stop(hdev);
exit:
    return retval;
}

static void koneplus_remove(struct hid_device *hdev)
{
    koneplus_remove_specials(hdev);
    hid_hw_stop(hdev);
}

static void koneplus_keep_values_up_to_date(struct koneplus_device *koneplus,
        u8 const *data)
{
    struct koneplus_mouse_report_button const *button_report;

    switch (data[0]) {
    case KONEPLUS_MOUSE_REPORT_NUMBER_BUTTON:
        button_report = (struct koneplus_mouse_report_button const *)data;
        switch (button_report->type) {
        case KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_PROFILE:
            koneplus_profile_activated(koneplus, button_report->data1 - 1);
            break;
        }
        break;
    }
}

static void koneplus_report_to_chrdev(struct koneplus_device const *koneplus,
        u8 const *data)
{
    struct koneplus_roccat_report roccat_report;
    struct koneplus_mouse_report_button const *button_report;

    if (data[0] != KONEPLUS_MOUSE_REPORT_NUMBER_BUTTON)
        return;

    button_report = (struct koneplus_mouse_report_button const *)data;

    if ((button_report->type == KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_QUICKLAUNCH ||
            button_report->type == KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_TIMER) &&
            button_report->data2 != KONEPLUS_MOUSE_REPORT_BUTTON_ACTION_PRESS)
        return;

    roccat_report.type = button_report->type;
    roccat_report.data1 = button_report->data1;
    roccat_report.data2 = button_report->data2;
    roccat_report.profile = koneplus->actual_profile + 1;
    roccat_report_event(koneplus->chrdev_minor,
            (uint8_t const *)&roccat_report);
}

static int koneplus_raw_event(struct hid_device *hdev,
        struct hid_report *report, u8 *data, int size)
{
    struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
    struct koneplus_device *koneplus = hid_get_drvdata(hdev);

    if (intf->cur_altsetting->desc.bInterfaceProtocol
            != USB_INTERFACE_PROTOCOL_MOUSE)
        return 0;

    if (koneplus == NULL)
        return 0;

    koneplus_keep_values_up_to_date(koneplus, data);

    if (koneplus->roccat_claimed)
        koneplus_report_to_chrdev(koneplus, data);

    return 0;
}

static const struct hid_device_id koneplus_devices[] = {
    { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_KONEPLUS) },
    { }
};

MODULE_DEVICE_TABLE(hid, koneplus_devices);

static struct hid_driver koneplus_driver = {
        .name = "koneplus",
        .id_table = koneplus_devices,
        .probe = koneplus_probe,
        .remove = koneplus_remove,
        .raw_event = koneplus_raw_event
};

static int __init koneplus_init(void)
{
    int retval;

    /* class name has to be same as driver name */
    koneplus_class = class_create(THIS_MODULE, "koneplus");
    if (IS_ERR(koneplus_class))
        return PTR_ERR(koneplus_class);
    koneplus_class->dev_attrs = koneplus_attributes;
    koneplus_class->dev_bin_attrs = koneplus_bin_attributes;

    retval = hid_register_driver(&koneplus_driver);
    if (retval)
        class_destroy(koneplus_class);
    return retval;
}

static void __exit koneplus_exit(void)
{
    hid_unregister_driver(&koneplus_driver);
    class_destroy(koneplus_class);
}

module_init(koneplus_init);
module_exit(koneplus_exit);

MODULE_AUTHOR("Stefan Achatz");
MODULE_DESCRIPTION("USB Roccat Kone[+] driver");
MODULE_LICENSE("GPL v2");