/*
 * Roccat Kone driver for Linux
 *
 * Copyright (c) 2010 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 Kone is a gamer mouse which consists of a mouse part and a keyboard
 * part. The keyboard part enables the mouse to execute stored macros with mixed
 * key- and button-events.
 *
 * TODO implement on-the-fly polling-rate change
 *      The windows driver has the ability to change the polling rate of the
 *      device on the press of a mousebutton.
 *      Is it possible to remove and reinstall the urb in raw-event- or any
 *      other handler, or to defer this action to be executed somewhere else?
 *
 * TODO is it possible to overwrite group for sysfs attributes via udev?
 */

#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-kone.h"

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

static void kone_profile_activated(struct kone_device *kone, uint new_profile)
{
        kone->actual_profile = new_profile;
        kone->actual_dpi = kone->profiles[new_profile - 1].startup_dpi;
}

static void kone_profile_report(struct kone_device *kone, uint new_profile)
{
        struct kone_roccat_report roccat_report;
        roccat_report.event = kone_mouse_event_switch_profile;
        roccat_report.value = new_profile;
        roccat_report.key = 0;
        roccat_report_event(kone->chrdev_minor, (uint8_t *)&roccat_report);
}

static int kone_receive(struct usb_device *usb_dev, uint usb_command,
                void *data, uint size)
{
        char *buf;
        int len;

        buf = kmalloc(size, GFP_KERNEL);
        if (buf == NULL)
                return -ENOMEM;

        len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
                        HID_REQ_GET_REPORT,
                        USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
                        usb_command, 0, buf, size, USB_CTRL_SET_TIMEOUT);

        memcpy(data, buf, size);
        kfree(buf);
        return ((len < 0) ? len : ((len != size) ? -EIO : 0));
}

static int kone_send(struct usb_device *usb_dev, uint usb_command,
                void const *data, uint size)
{
        char *buf;
        int len;

        buf = kmemdup(data, size, GFP_KERNEL);
        if (buf == NULL)
                return -ENOMEM;

        len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
                        HID_REQ_SET_REPORT,
                        USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
                        usb_command, 0, buf, size, USB_CTRL_SET_TIMEOUT);

        kfree(buf);
        return ((len < 0) ? len : ((len != size) ? -EIO : 0));
}

/* kone_class is used for creating sysfs attributes via roccat char device */
static struct class *kone_class;

static void kone_set_settings_checksum(struct kone_settings *settings)
{
        uint16_t checksum = 0;
        unsigned char *address = (unsigned char *)settings;
        int i;

        for (i = 0; i < sizeof(struct kone_settings) - 2; ++i, ++address)
                checksum += *address;
        settings->checksum = cpu_to_le16(checksum);
}

/*
 * Checks success after writing data to mouse
 * On success returns 0
 * On failure returns errno
 */
static int kone_check_write(struct usb_device *usb_dev)
{
        int retval;
        uint8_t data;

        do {
                /*
                 * Mouse needs 50 msecs until it says ok, but there are
                 * 30 more msecs needed for next write to work.
                 */
                msleep(80);

                retval = kone_receive(usb_dev,
                                kone_command_confirm_write, &data, 1);
                if (retval)
                        return retval;

                /*
                 * value of 3 seems to mean something like
                 * "not finished yet, but it looks good"
                 * So check again after a moment.
                 */
        } while (data == 3);

        if (data == 1) /* everything alright */
                return 0;

        /* unknown answer */
        hid_err(usb_dev, "got retval %d when checking write\n", data);
        return -EIO;
}

/*
 * Reads settings from mouse and stores it in @buf
 * On success returns 0
 * On failure returns errno
 */
static int kone_get_settings(struct usb_device *usb_dev,
                struct kone_settings *buf)
{
        return kone_receive(usb_dev, kone_command_settings, buf,
                        sizeof(struct kone_settings));
}

/*
 * Writes settings from @buf to mouse
 * On success returns 0
 * On failure returns errno
 */
static int kone_set_settings(struct usb_device *usb_dev,
                struct kone_settings const *settings)
{
        int retval;
        retval = kone_send(usb_dev, kone_command_settings,
                        settings, sizeof(struct kone_settings));
        if (retval)
                return retval;
        return kone_check_write(usb_dev);
}

/*
 * Reads profile data from mouse and stores it in @buf
 * @number: profile number to read
 * On success returns 0
 * On failure returns errno
 */
static int kone_get_profile(struct usb_device *usb_dev,
                struct kone_profile *buf, int number)
{
        int len;

        if (number < 1 || number > 5)
                return -EINVAL;

        len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
                        USB_REQ_CLEAR_FEATURE,
                        USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
                        kone_command_profile, number, buf,
                        sizeof(struct kone_profile), USB_CTRL_SET_TIMEOUT);

        if (len != sizeof(struct kone_profile))
                return -EIO;

        return 0;
}

/*
 * Writes profile data to mouse.
 * @number: profile number to write
 * On success returns 0
 * On failure returns errno
 */
static int kone_set_profile(struct usb_device *usb_dev,
                struct kone_profile const *profile, int number)
{
        int len;

        if (number < 1 || number > 5)
                return -EINVAL;

        len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
                        USB_REQ_SET_CONFIGURATION,
                        USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
                        kone_command_profile, number, (void *)profile,
                        sizeof(struct kone_profile),
                        USB_CTRL_SET_TIMEOUT);

        if (len != sizeof(struct kone_profile))
                return len;

        if (kone_check_write(usb_dev))
                return -EIO;

        return 0;
}

/*
 * Reads value of "fast-clip-weight" and stores it in @result
 * On success returns 0
 * On failure returns errno
 */
static int kone_get_weight(struct usb_device *usb_dev, int *result)
{
        int retval;
        uint8_t data;

        retval = kone_receive(usb_dev, kone_command_weight, &data, 1);

        if (retval)
                return retval;

        *result = (int)data;
        return 0;
}

/*
 * Reads firmware_version of mouse and stores it in @result
 * On success returns 0
 * On failure returns errno
 */
static int kone_get_firmware_version(struct usb_device *usb_dev, int *result)
{
        int retval;
        uint16_t data;

        retval = kone_receive(usb_dev, kone_command_firmware_version,
                        &data, 2);
        if (retval)
                return retval;

        *result = le16_to_cpu(data);
        return 0;
}

static ssize_t kone_sysfs_read_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 kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));

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

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

        mutex_lock(&kone->kone_lock);
        memcpy(buf, ((char const *)&kone->settings) + off, count);
        mutex_unlock(&kone->kone_lock);

        return count;
}

/*
 * Writing settings automatically activates startup_profile.
 * This function keeps values in kone_device up to date and assumes that in
 * case of error the old data is still valid
 */
static ssize_t kone_sysfs_write_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 kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));
        struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
        int retval = 0, difference, old_profile;

        /* I need to get my data in one piece */
        if (off != 0 || count != sizeof(struct kone_settings))
                return -EINVAL;

        mutex_lock(&kone->kone_lock);
        difference = memcmp(buf, &kone->settings, sizeof(struct kone_settings));
        if (difference) {
                retval = kone_set_settings(usb_dev,
                                (struct kone_settings const *)buf);
                if (retval) {
                        mutex_unlock(&kone->kone_lock);
                        return retval;
                }

                old_profile = kone->settings.startup_profile;
                memcpy(&kone->settings, buf, sizeof(struct kone_settings));

                kone_profile_activated(kone, kone->settings.startup_profile);

                if (kone->settings.startup_profile != old_profile)
                        kone_profile_report(kone, kone->settings.startup_profile);
        }
        mutex_unlock(&kone->kone_lock);

        return sizeof(struct kone_settings);
}

static ssize_t kone_sysfs_read_profilex(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 kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));

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

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

        mutex_lock(&kone->kone_lock);
        memcpy(buf, ((char const *)&kone->profiles[*(uint *)(attr->private)]) + off, count);
        mutex_unlock(&kone->kone_lock);

        return count;
}

/* Writes data only if different to stored data */
static ssize_t kone_sysfs_write_profilex(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 kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));
        struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
        struct kone_profile *profile;
        int retval = 0, difference;

        /* I need to get my data in one piece */
        if (off != 0 || count != sizeof(struct kone_profile))
                return -EINVAL;

        profile = &kone->profiles[*(uint *)(attr->private)];

        mutex_lock(&kone->kone_lock);
        difference = memcmp(buf, profile, sizeof(struct kone_profile));
        if (difference) {
                retval = kone_set_profile(usb_dev,
                                (struct kone_profile const *)buf,
                                *(uint *)(attr->private) + 1);
                if (!retval)
                        memcpy(profile, buf, sizeof(struct kone_profile));
        }
        mutex_unlock(&kone->kone_lock);

        if (retval)
                return retval;

        return sizeof(struct kone_profile);
}

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

static ssize_t kone_sysfs_show_actual_dpi(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct kone_device *kone =
                        hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
        return snprintf(buf, PAGE_SIZE, "%d\n", kone->actual_dpi);
}

/* weight is read each time, since we don't get informed when it's changed */
static ssize_t kone_sysfs_show_weight(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct kone_device *kone;
        struct usb_device *usb_dev;
        int weight = 0;
        int retval;

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

        mutex_lock(&kone->kone_lock);
        retval = kone_get_weight(usb_dev, &weight);
        mutex_unlock(&kone->kone_lock);

        if (retval)
                return retval;
        return snprintf(buf, PAGE_SIZE, "%d\n", weight);
}

static ssize_t kone_sysfs_show_firmware_version(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct kone_device *kone =
                        hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
        return snprintf(buf, PAGE_SIZE, "%d\n", kone->firmware_version);
}

static ssize_t kone_sysfs_show_tcu(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct kone_device *kone =
                        hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
        return snprintf(buf, PAGE_SIZE, "%d\n", kone->settings.tcu);
}

static int kone_tcu_command(struct usb_device *usb_dev, int number)
{
        unsigned char value;
        value = number;
        return kone_send(usb_dev, kone_command_calibrate, &value, 1);
}

/*
 * Calibrating the tcu is the only action that changes settings data inside the
 * mouse, so this data needs to be reread
 */
static ssize_t kone_sysfs_set_tcu(struct device *dev,
                struct device_attribute *attr, char const *buf, size_t size)
{
        struct kone_device *kone;
        struct usb_device *usb_dev;
        int retval;
        unsigned long state;

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

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

        if (state != 0 && state != 1)
                return -EINVAL;

        mutex_lock(&kone->kone_lock);

        if (state == 1) { /* state activate */
                retval = kone_tcu_command(usb_dev, 1);
                if (retval)
                        goto exit_unlock;
                retval = kone_tcu_command(usb_dev, 2);
                if (retval)
                        goto exit_unlock;
                ssleep(5); /* tcu needs this time for calibration */
                retval = kone_tcu_command(usb_dev, 3);
                if (retval)
                        goto exit_unlock;
                retval = kone_tcu_command(usb_dev, 0);
                if (retval)
                        goto exit_unlock;
                retval = kone_tcu_command(usb_dev, 4);
                if (retval)
                        goto exit_unlock;
                /*
                 * Kone needs this time to settle things.
                 * Reading settings too early will result in invalid data.
                 * Roccat's driver waits 1 sec, maybe this time could be
                 * shortened.
                 */
                ssleep(1);
        }

        /* calibration changes values in settings, so reread */
        retval = kone_get_settings(usb_dev, &kone->settings);
        if (retval)
                goto exit_no_settings;

        /* only write settings back if activation state is different */
        if (kone->settings.tcu != state) {
                kone->settings.tcu = state;
                kone_set_settings_checksum(&kone->settings);

                retval = kone_set_settings(usb_dev, &kone->settings);
                if (retval) {
                        hid_err(usb_dev, "couldn't set tcu state\n");
                        /*
                         * try to reread valid settings into buffer overwriting
                         * first error code
                         */
                        retval = kone_get_settings(usb_dev, &kone->settings);
                        if (retval)
                                goto exit_no_settings;
                        goto exit_unlock;
                }
                /* calibration resets profile */
                kone_profile_activated(kone, kone->settings.startup_profile);
        }

        retval = size;
exit_no_settings:
        hid_err(usb_dev, "couldn't read settings\n");
exit_unlock:
        mutex_unlock(&kone->kone_lock);
        return retval;
}

static ssize_t kone_sysfs_show_startup_profile(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct kone_device *kone =
                        hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
        return snprintf(buf, PAGE_SIZE, "%d\n", kone->settings.startup_profile);
}

static ssize_t kone_sysfs_set_startup_profile(struct device *dev,
                struct device_attribute *attr, char const *buf, size_t size)
{
        struct kone_device *kone;
        struct usb_device *usb_dev;
        int retval;
        unsigned long new_startup_profile;

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

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

        if (new_startup_profile  < 1 || new_startup_profile > 5)
                return -EINVAL;

        mutex_lock(&kone->kone_lock);

        kone->settings.startup_profile = new_startup_profile;
        kone_set_settings_checksum(&kone->settings);

        retval = kone_set_settings(usb_dev, &kone->settings);
        if (retval) {
                mutex_unlock(&kone->kone_lock);
                return retval;
        }

        /* changing the startup profile immediately activates this profile */
        kone_profile_activated(kone, new_startup_profile);
        kone_profile_report(kone, new_startup_profile);

        mutex_unlock(&kone->kone_lock);
        return size;
}

static struct device_attribute kone_attributes[] = {
        /*
         * Read actual dpi settings.
         * Returns raw value for further processing. Refer to enum
         * kone_polling_rates to get real value.
         */
        __ATTR(actual_dpi, 0440, kone_sysfs_show_actual_dpi, NULL),
        __ATTR(actual_profile, 0440, kone_sysfs_show_actual_profile, NULL),

        /*
         * The mouse can be equipped with one of four supplied weights from 5
         * to 20 grams which are recognized and its value can be read out.
         * This returns the raw value reported by the mouse for easy evaluation
         * by software. Refer to enum kone_weights to get corresponding real
         * weight.
         */
        __ATTR(weight, 0440, kone_sysfs_show_weight, NULL),

        /*
         * Prints firmware version stored in mouse as integer.
         * The raw value reported by the mouse is returned for easy evaluation,
         * to get the real version number the decimal point has to be shifted 2
         * positions to the left. E.g. a value of 138 means 1.38.
         */
        __ATTR(firmware_version, 0440,
                        kone_sysfs_show_firmware_version, NULL),

        /*
         * Prints state of Tracking Control Unit as number where 0 = off and
         * 1 = on. Writing 0 deactivates tcu and writing 1 calibrates and
         * activates the tcu
         */
        __ATTR(tcu, 0660, kone_sysfs_show_tcu, kone_sysfs_set_tcu),

        /* Prints and takes the number of the profile the mouse starts with */
        __ATTR(startup_profile, 0660,
                        kone_sysfs_show_startup_profile,
                        kone_sysfs_set_startup_profile),
        __ATTR_NULL
};

static struct bin_attribute kone_bin_attributes[] = {
        {
                .attr = { .name = "settings", .mode = 0660 },
                .size = sizeof(struct kone_settings),
                .read = kone_sysfs_read_settings,
                .write = kone_sysfs_write_settings
        },
        {
                .attr = { .name = "profile1", .mode = 0660 },
                .size = sizeof(struct kone_profile),
                .read = kone_sysfs_read_profilex,
                .write = kone_sysfs_write_profilex,
                .private = &profile_numbers[0]
        },
        {
                .attr = { .name = "profile2", .mode = 0660 },
                .size = sizeof(struct kone_profile),
                .read = kone_sysfs_read_profilex,
                .write = kone_sysfs_write_profilex,
                .private = &profile_numbers[1]
        },
        {
                .attr = { .name = "profile3", .mode = 0660 },
                .size = sizeof(struct kone_profile),
                .read = kone_sysfs_read_profilex,
                .write = kone_sysfs_write_profilex,
                .private = &profile_numbers[2]
        },
        {
                .attr = { .name = "profile4", .mode = 0660 },
                .size = sizeof(struct kone_profile),
                .read = kone_sysfs_read_profilex,
                .write = kone_sysfs_write_profilex,
                .private = &profile_numbers[3]
        },
        {
                .attr = { .name = "profile5", .mode = 0660 },
                .size = sizeof(struct kone_profile),
                .read = kone_sysfs_read_profilex,
                .write = kone_sysfs_write_profilex,
                .private = &profile_numbers[4]
        },
        __ATTR_NULL
};

static int kone_init_kone_device_struct(struct usb_device *usb_dev,
                struct kone_device *kone)
{
        uint i;
        int retval;

        mutex_init(&kone->kone_lock);

        for (i = 0; i < 5; ++i) {
                retval = kone_get_profile(usb_dev, &kone->profiles[i], i + 1);
                if (retval)
                        return retval;
        }

        retval = kone_get_settings(usb_dev, &kone->settings);
        if (retval)
                return retval;

        retval = kone_get_firmware_version(usb_dev, &kone->firmware_version);
        if (retval)
                return retval;

        kone_profile_activated(kone, kone->settings.startup_profile);

        return 0;
}

/*
 * Since IGNORE_MOUSE quirk moved to hid-apple, there is no way to bind only to
 * mousepart if usb_hid is compiled into the kernel and kone is compiled as
 * module.
 * Secial behaviour is bound only to mousepart since only mouseevents contain
 * additional notifications.
 */
static int kone_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 kone_device *kone;
        int retval;

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

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

                retval = kone_init_kone_device_struct(usb_dev, kone);
                if (retval) {
                        hid_err(hdev, "couldn't init struct kone_device\n");
                        goto exit_free;
                }

                retval = roccat_connect(kone_class, hdev,
                                sizeof(struct kone_roccat_report));
                if (retval < 0) {
                        hid_err(hdev, "couldn't init char dev\n");
                        /* be tolerant about not getting chrdev */
                } else {
                        kone->roccat_claimed = 1;
                        kone->chrdev_minor = retval;
                }
        } else {
                hid_set_drvdata(hdev, NULL);
        }

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

static void kone_remove_specials(struct hid_device *hdev)
{
        struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
        struct kone_device *kone;

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

static int kone_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 = kone_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 kone_remove(struct hid_device *hdev)
{
        kone_remove_specials(hdev);
        hid_hw_stop(hdev);
}

/* handle special events and keep actual profile and dpi values up to date */
static void kone_keep_values_up_to_date(struct kone_device *kone,
                struct kone_mouse_event const *event)
{
        switch (event->event) {
        case kone_mouse_event_switch_profile:
                kone->actual_dpi = kone->profiles[event->value - 1].
                                startup_dpi;
        case kone_mouse_event_osd_profile:
                kone->actual_profile = event->value;
                break;
        case kone_mouse_event_switch_dpi:
        case kone_mouse_event_osd_dpi:
                kone->actual_dpi = event->value;
                break;
        }
}

static void kone_report_to_chrdev(struct kone_device const *kone,
                struct kone_mouse_event const *event)
{
        struct kone_roccat_report roccat_report;

        switch (event->event) {
        case kone_mouse_event_switch_profile:
        case kone_mouse_event_switch_dpi:
        case kone_mouse_event_osd_profile:
        case kone_mouse_event_osd_dpi:
                roccat_report.event = event->event;
                roccat_report.value = event->value;
                roccat_report.key = 0;
                roccat_report_event(kone->chrdev_minor,
                                (uint8_t *)&roccat_report);
                break;
        case kone_mouse_event_call_overlong_macro:
                if (event->value == kone_keystroke_action_press) {
                        roccat_report.event = kone_mouse_event_call_overlong_macro;
                        roccat_report.value = kone->actual_profile;
                        roccat_report.key = event->macro_key;
                        roccat_report_event(kone->chrdev_minor,
                                        (uint8_t *)&roccat_report);
                }
                break;
        }

}

/*
 * Is called for keyboard- and mousepart.
 * Only mousepart gets informations about special events in its extended event
 * structure.
 */
static int kone_raw_event(struct hid_device *hdev, struct hid_report *report,
                u8 *data, int size)
{
        struct kone_device *kone = hid_get_drvdata(hdev);
        struct kone_mouse_event *event = (struct kone_mouse_event *)data;

        /* keyboard events are always processed by default handler */
        if (size != sizeof(struct kone_mouse_event))
                return 0;

        if (kone == NULL)
                return 0;

        /*
         * Firmware 1.38 introduced new behaviour for tilt and special buttons.
         * Pressed button is reported in each movement event.
         * Workaround sends only one event per press.
         */
        if (memcmp(&kone->last_mouse_event.tilt, &event->tilt, 5))
                memcpy(&kone->last_mouse_event, event,
                                sizeof(struct kone_mouse_event));
        else
                memset(&event->tilt, 0, 5);

        kone_keep_values_up_to_date(kone, event);

        if (kone->roccat_claimed)
                kone_report_to_chrdev(kone, event);

        return 0; /* always do further processing */
}

static const struct hid_device_id kone_devices[] = {
        { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_KONE) },
        { }
};

MODULE_DEVICE_TABLE(hid, kone_devices);

static struct hid_driver kone_driver = {
                .name = "kone",
                .id_table = kone_devices,
                .probe = kone_probe,
                .remove = kone_remove,
                .raw_event = kone_raw_event
};

static int __init kone_init(void)
{
        int retval;

        /* class name has to be same as driver name */
        kone_class = class_create(THIS_MODULE, "kone");
        if (IS_ERR(kone_class))
                return PTR_ERR(kone_class);
        kone_class->dev_attrs = kone_attributes;
        kone_class->dev_bin_attrs = kone_bin_attributes;

        retval = hid_register_driver(&kone_driver);
        if (retval)
                class_destroy(kone_class);
        return retval;
}

static void __exit kone_exit(void)
{
        hid_unregister_driver(&kone_driver);
        class_destroy(kone_class);
}

module_init(kone_init);
module_exit(kone_exit);

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