/*
 * Roccat Kova[+] driver for Linux
 *
 * Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
 */

/*
 * 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 Kova[+] is a bigger version of the Pyra with two more side buttons.
 */

#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-kovaplus.h"

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

static struct class *kovaplus_class;

static uint kovaplus_convert_event_cpi(uint value)
{
	return (value == 7 ? 4 : (value == 4 ? 3 : value));
}

static void kovaplus_profile_activated(struct kovaplus_device *kovaplus,
		uint new_profile_index)
{
	kovaplus->actual_profile = new_profile_index;
	kovaplus->actual_cpi = kovaplus->profile_settings[new_profile_index].cpi_startup_level;
	kovaplus->actual_x_sensitivity = kovaplus->profile_settings[new_profile_index].sensitivity_x;
	kovaplus->actual_y_sensitivity = kovaplus->profile_settings[new_profile_index].sensitivity_y;
}

static int kovaplus_send_control(struct usb_device *usb_dev, uint value,
		enum kovaplus_control_requests request)
{
	int retval;
	struct kovaplus_control control;

	if ((request == KOVAPLUS_CONTROL_REQUEST_PROFILE_SETTINGS ||
			request == KOVAPLUS_CONTROL_REQUEST_PROFILE_BUTTONS) &&
			value > 4)
		return -EINVAL;

	control.command = KOVAPLUS_COMMAND_CONTROL;
	control.value = value;
	control.request = request;

	retval = roccat_common_send(usb_dev, KOVAPLUS_USB_COMMAND_CONTROL,
			&control, sizeof(struct kovaplus_control));

	return retval;
}

static int kovaplus_receive_control_status(struct usb_device *usb_dev)
{
	int retval;
	struct kovaplus_control control;

	do {
		retval = roccat_common_receive(usb_dev, KOVAPLUS_USB_COMMAND_CONTROL,
				&control, sizeof(struct kovaplus_control));

		/* check if we get a completely wrong answer */
		if (retval)
			return retval;

		if (control.value == KOVAPLUS_CONTROL_REQUEST_STATUS_OK)
			return 0;

		/* indicates that hardware needs some more time to complete action */
		if (control.value == KOVAPLUS_CONTROL_REQUEST_STATUS_WAIT) {
			msleep(500); /* windows driver uses 1000 */
			continue;
		}

		/* seems to be critical - replug necessary */
		if (control.value == KOVAPLUS_CONTROL_REQUEST_STATUS_OVERLOAD)
			return -EINVAL;

		hid_err(usb_dev, "kovaplus_receive_control_status: "
				"unknown response value 0x%x\n", control.value);
		return -EINVAL;
	} while (1);
}

static int kovaplus_send(struct usb_device *usb_dev, uint command,
		void const *buf, uint size)
{
	int retval;

	retval = roccat_common_send(usb_dev, command, buf, size);
	if (retval)
		return retval;

	msleep(100);

	return kovaplus_receive_control_status(usb_dev);
}

static int kovaplus_select_profile(struct usb_device *usb_dev, uint number,
		enum kovaplus_control_requests request)
{
	return kovaplus_send_control(usb_dev, number, request);
}

static int kovaplus_get_info(struct usb_device *usb_dev,
		struct kovaplus_info *buf)
{
	return roccat_common_receive(usb_dev, KOVAPLUS_USB_COMMAND_INFO,
			buf, sizeof(struct kovaplus_info));
}

static int kovaplus_get_profile_settings(struct usb_device *usb_dev,
		struct kovaplus_profile_settings *buf, uint number)
{
	int retval;

	retval = kovaplus_select_profile(usb_dev, number,
			KOVAPLUS_CONTROL_REQUEST_PROFILE_SETTINGS);
	if (retval)
		return retval;

	return roccat_common_receive(usb_dev, KOVAPLUS_USB_COMMAND_PROFILE_SETTINGS,
			buf, sizeof(struct kovaplus_profile_settings));
}

static int kovaplus_set_profile_settings(struct usb_device *usb_dev,
		struct kovaplus_profile_settings const *settings)
{
	return kovaplus_send(usb_dev, KOVAPLUS_USB_COMMAND_PROFILE_SETTINGS,
			settings, sizeof(struct kovaplus_profile_settings));
}

static int kovaplus_get_profile_buttons(struct usb_device *usb_dev,
		struct kovaplus_profile_buttons *buf, int number)
{
	int retval;

	retval = kovaplus_select_profile(usb_dev, number,
			KOVAPLUS_CONTROL_REQUEST_PROFILE_BUTTONS);
	if (retval)
		return retval;

	return roccat_common_receive(usb_dev, KOVAPLUS_USB_COMMAND_PROFILE_BUTTONS,
			buf, sizeof(struct kovaplus_profile_buttons));
}

static int kovaplus_set_profile_buttons(struct usb_device *usb_dev,
		struct kovaplus_profile_buttons const *buttons)
{
	return kovaplus_send(usb_dev, KOVAPLUS_USB_COMMAND_PROFILE_BUTTONS,
			buttons, sizeof(struct kovaplus_profile_buttons));
}

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

	retval = roccat_common_receive(usb_dev, KOVAPLUS_USB_COMMAND_ACTUAL_PROFILE,
			&buf, sizeof(struct kovaplus_actual_profile));

	return retval ? retval : buf.actual_profile;
}

static int kovaplus_set_actual_profile(struct usb_device *usb_dev,
		int new_profile)
{
	struct kovaplus_actual_profile buf;

	buf.command = KOVAPLUS_COMMAND_ACTUAL_PROFILE;
	buf.size = sizeof(struct kovaplus_actual_profile);
	buf.actual_profile = new_profile;

	return kovaplus_send(usb_dev, KOVAPLUS_USB_COMMAND_ACTUAL_PROFILE,
			&buf, sizeof(struct kovaplus_actual_profile));
}

static ssize_t kovaplus_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 kovaplus_device *kovaplus = hid_get_drvdata(dev_get_drvdata(dev));

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

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

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

	return count;
}

static ssize_t kovaplus_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 kovaplus_device *kovaplus = 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_index;
	struct kovaplus_profile_settings *profile_settings;

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

	profile_index = ((struct kovaplus_profile_settings const *)buf)->profile_index;
	profile_settings = &kovaplus->profile_settings[profile_index];

	mutex_lock(&kovaplus->kovaplus_lock);
	difference = memcmp(buf, profile_settings,
			sizeof(struct kovaplus_profile_settings));
	if (difference) {
		retval = kovaplus_set_profile_settings(usb_dev,
				(struct kovaplus_profile_settings const *)buf);
		if (!retval)
			memcpy(profile_settings, buf,
					sizeof(struct kovaplus_profile_settings));
	}
	mutex_unlock(&kovaplus->kovaplus_lock);

	if (retval)
		return retval;

	return sizeof(struct kovaplus_profile_settings);
}

static ssize_t kovaplus_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 kovaplus_device *kovaplus = hid_get_drvdata(dev_get_drvdata(dev));

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

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

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

	return count;
}

static ssize_t kovaplus_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 kovaplus_device *kovaplus = 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_index;
	struct kovaplus_profile_buttons *profile_buttons;

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

	profile_index = ((struct kovaplus_profile_buttons const *)buf)->profile_index;
	profile_buttons = &kovaplus->profile_buttons[profile_index];

	mutex_lock(&kovaplus->kovaplus_lock);
	difference = memcmp(buf, profile_buttons,
			sizeof(struct kovaplus_profile_buttons));
	if (difference) {
		retval = kovaplus_set_profile_buttons(usb_dev,
				(struct kovaplus_profile_buttons const *)buf);
		if (!retval)
			memcpy(profile_buttons, buf,
					sizeof(struct kovaplus_profile_buttons));
	}
	mutex_unlock(&kovaplus->kovaplus_lock);

	if (retval)
		return retval;

	return sizeof(struct kovaplus_profile_buttons);
}

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

static ssize_t kovaplus_sysfs_set_actual_profile(struct device *dev,
		struct device_attribute *attr, char const *buf, size_t size)
{
	struct kovaplus_device *kovaplus;
	struct usb_device *usb_dev;
	unsigned long profile;
	int retval;

	dev = dev->parent->parent;
	kovaplus = 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 >= 5)
		return -EINVAL;

	mutex_lock(&kovaplus->kovaplus_lock);
	retval = kovaplus_set_actual_profile(usb_dev, profile);
	kovaplus->actual_profile = profile;
	mutex_unlock(&kovaplus->kovaplus_lock);
	if (retval)
		return retval;

	return size;
}

static ssize_t kovaplus_sysfs_show_actual_cpi(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct kovaplus_device *kovaplus =
			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	return snprintf(buf, PAGE_SIZE, "%d\n", kovaplus->actual_cpi);
}

static ssize_t kovaplus_sysfs_show_actual_sensitivity_x(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct kovaplus_device *kovaplus =
			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	return snprintf(buf, PAGE_SIZE, "%d\n", kovaplus->actual_x_sensitivity);
}

static ssize_t kovaplus_sysfs_show_actual_sensitivity_y(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct kovaplus_device *kovaplus =
			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	return snprintf(buf, PAGE_SIZE, "%d\n", kovaplus->actual_y_sensitivity);
}

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

static struct device_attribute kovaplus_attributes[] = {
	__ATTR(actual_cpi, 0440,
		kovaplus_sysfs_show_actual_cpi, NULL),
	__ATTR(firmware_version, 0440,
		kovaplus_sysfs_show_firmware_version, NULL),
	__ATTR(actual_profile, 0660,
		kovaplus_sysfs_show_actual_profile,
		kovaplus_sysfs_set_actual_profile),
	__ATTR(actual_sensitivity_x, 0440,
		kovaplus_sysfs_show_actual_sensitivity_x, NULL),
	__ATTR(actual_sensitivity_y, 0440,
		kovaplus_sysfs_show_actual_sensitivity_y, NULL),
	__ATTR_NULL
};

static struct bin_attribute kovaplus_bin_attributes[] = {
	{
		.attr = { .name = "profile_settings", .mode = 0220 },
		.size = sizeof(struct kovaplus_profile_settings),
		.write = kovaplus_sysfs_write_profile_settings
	},
	{
		.attr = { .name = "profile1_settings", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_settings),
		.read = kovaplus_sysfs_read_profilex_settings,
		.private = &profile_numbers[0]
	},
	{
		.attr = { .name = "profile2_settings", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_settings),
		.read = kovaplus_sysfs_read_profilex_settings,
		.private = &profile_numbers[1]
	},
	{
		.attr = { .name = "profile3_settings", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_settings),
		.read = kovaplus_sysfs_read_profilex_settings,
		.private = &profile_numbers[2]
	},
	{
		.attr = { .name = "profile4_settings", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_settings),
		.read = kovaplus_sysfs_read_profilex_settings,
		.private = &profile_numbers[3]
	},
	{
		.attr = { .name = "profile5_settings", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_settings),
		.read = kovaplus_sysfs_read_profilex_settings,
		.private = &profile_numbers[4]
	},
	{
		.attr = { .name = "profile_buttons", .mode = 0220 },
		.size = sizeof(struct kovaplus_profile_buttons),
		.write = kovaplus_sysfs_write_profile_buttons
	},
	{
		.attr = { .name = "profile1_buttons", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_buttons),
		.read = kovaplus_sysfs_read_profilex_buttons,
		.private = &profile_numbers[0]
	},
	{
		.attr = { .name = "profile2_buttons", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_buttons),
		.read = kovaplus_sysfs_read_profilex_buttons,
		.private = &profile_numbers[1]
	},
	{
		.attr = { .name = "profile3_buttons", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_buttons),
		.read = kovaplus_sysfs_read_profilex_buttons,
		.private = &profile_numbers[2]
	},
	{
		.attr = { .name = "profile4_buttons", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_buttons),
		.read = kovaplus_sysfs_read_profilex_buttons,
		.private = &profile_numbers[3]
	},
	{
		.attr = { .name = "profile5_buttons", .mode = 0440 },
		.size = sizeof(struct kovaplus_profile_buttons),
		.read = kovaplus_sysfs_read_profilex_buttons,
		.private = &profile_numbers[4]
	},
	__ATTR_NULL
};

static int kovaplus_init_kovaplus_device_struct(struct usb_device *usb_dev,
		struct kovaplus_device *kovaplus)
{
	int retval, i;
	static uint wait = 70; /* device will freeze with just 60 */

	mutex_init(&kovaplus->kovaplus_lock);

	retval = kovaplus_get_info(usb_dev, &kovaplus->info);
	if (retval)
		return retval;

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

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

	msleep(wait);
	retval = kovaplus_get_actual_profile(usb_dev);
	if (retval < 0)
		return retval;
	kovaplus_profile_activated(kovaplus, retval);

	return 0;
}

static int kovaplus_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 kovaplus_device *kovaplus;
	int retval;

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

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

		retval = kovaplus_init_kovaplus_device_struct(usb_dev, kovaplus);
		if (retval) {
			hid_err(hdev, "couldn't init struct kovaplus_device\n");
			goto exit_free;
		}

		retval = roccat_connect(kovaplus_class, hdev,
				sizeof(struct kovaplus_roccat_report));
		if (retval < 0) {
			hid_err(hdev, "couldn't init char dev\n");
		} else {
			kovaplus->chrdev_minor = retval;
			kovaplus->roccat_claimed = 1;
		}

	} else {
		hid_set_drvdata(hdev, NULL);
	}

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

static void kovaplus_remove_specials(struct hid_device *hdev)
{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	struct kovaplus_device *kovaplus;

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

static int kovaplus_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 = kovaplus_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 kovaplus_remove(struct hid_device *hdev)
{
	kovaplus_remove_specials(hdev);
	hid_hw_stop(hdev);
}

static void kovaplus_keep_values_up_to_date(struct kovaplus_device *kovaplus,
		u8 const *data)
{
	struct kovaplus_mouse_report_button const *button_report;

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

	button_report = (struct kovaplus_mouse_report_button const *)data;

	switch (button_report->type) {
	case KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_PROFILE_1:
		kovaplus_profile_activated(kovaplus, button_report->data1 - 1);
		break;
	case KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_CPI:
		kovaplus->actual_cpi = kovaplus_convert_event_cpi(button_report->data1);
	case KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_SENSITIVITY:
		kovaplus->actual_x_sensitivity = button_report->data1;
		kovaplus->actual_y_sensitivity = button_report->data2;
	}
}

static void kovaplus_report_to_chrdev(struct kovaplus_device const *kovaplus,
		u8 const *data)
{
	struct kovaplus_roccat_report roccat_report;
	struct kovaplus_mouse_report_button const *button_report;

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

	button_report = (struct kovaplus_mouse_report_button const *)data;

	if (button_report->type == KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_PROFILE_2)
		return;

	roccat_report.type = button_report->type;
	roccat_report.profile = kovaplus->actual_profile + 1;

	if (roccat_report.type == KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_MACRO ||
			roccat_report.type == KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_SHORTCUT ||
			roccat_report.type == KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_QUICKLAUNCH ||
			roccat_report.type == KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_TIMER)
		roccat_report.button = button_report->data1;
	else
		roccat_report.button = 0;

	if (roccat_report.type == KOVAPLUS_MOUSE_REPORT_BUTTON_TYPE_CPI)
		roccat_report.data1 = kovaplus_convert_event_cpi(button_report->data1);
	else
		roccat_report.data1 = button_report->data1;

	roccat_report.data2 = button_report->data2;

	roccat_report_event(kovaplus->chrdev_minor,
			(uint8_t const *)&roccat_report);
}

static int kovaplus_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 kovaplus_device *kovaplus = hid_get_drvdata(hdev);

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

	kovaplus_keep_values_up_to_date(kovaplus, data);

	if (kovaplus->roccat_claimed)
		kovaplus_report_to_chrdev(kovaplus, data);

	return 0;
}

static const struct hid_device_id kovaplus_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_KOVAPLUS) },
	{ }
};

MODULE_DEVICE_TABLE(hid, kovaplus_devices);

static struct hid_driver kovaplus_driver = {
		.name = "kovaplus",
		.id_table = kovaplus_devices,
		.probe = kovaplus_probe,
		.remove = kovaplus_remove,
		.raw_event = kovaplus_raw_event
};

static int __init kovaplus_init(void)
{
	int retval;

	kovaplus_class = class_create(THIS_MODULE, "kovaplus");
	if (IS_ERR(kovaplus_class))
		return PTR_ERR(kovaplus_class);
	kovaplus_class->dev_attrs = kovaplus_attributes;
	kovaplus_class->dev_bin_attrs = kovaplus_bin_attributes;

	retval = hid_register_driver(&kovaplus_driver);
	if (retval)
		class_destroy(kovaplus_class);
	return retval;
}

static void __exit kovaplus_exit(void)
{
	hid_unregister_driver(&kovaplus_driver);
	class_destroy(kovaplus_class);
}

module_init(kovaplus_init);
module_exit(kovaplus_exit);

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