drivers/hid/hid-roccat-arvo.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * Roccat Arvo 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 Arvo is a gamer keyboard with 5 macro keys that can be configured in
  * 5 profiles.
  */

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

 static struct class *arvo_class;

 static ssize_t arvo_sysfs_show_mode_key(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct arvo_device *arvo =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
 	struct usb_device *usb_dev =
 			interface_to_usbdev(to_usb_interface(dev->parent->parent));
 	struct arvo_mode_key temp_buf;
 	int retval;

 	mutex_lock(&arvo->arvo_lock);
 	retval = roccat_common_receive(usb_dev, ARVO_USB_COMMAND_MODE_KEY,
 			&temp_buf, sizeof(struct arvo_mode_key));
 	mutex_unlock(&arvo->arvo_lock);
 	if (retval)
 		return retval;

 	return snprintf(buf, PAGE_SIZE, "%d\n", temp_buf.state);
 }

 static ssize_t arvo_sysfs_set_mode_key(struct device *dev,
 		struct device_attribute *attr, char const *buf, size_t size)
 {
 	struct arvo_device *arvo =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
 	struct usb_device *usb_dev =
 			interface_to_usbdev(to_usb_interface(dev->parent->parent));
 	struct arvo_mode_key temp_buf;
 	unsigned long state;
 	int retval;

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

 	temp_buf.command = ARVO_COMMAND_MODE_KEY;
 	temp_buf.state = state;

 	mutex_lock(&arvo->arvo_lock);
 	retval = roccat_common_send(usb_dev, ARVO_USB_COMMAND_MODE_KEY,
 			&temp_buf, sizeof(struct arvo_mode_key));
 	mutex_unlock(&arvo->arvo_lock);
 	if (retval)
 		return retval;

 	return size;
 }

 static ssize_t arvo_sysfs_show_key_mask(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct arvo_device *arvo =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
 	struct usb_device *usb_dev =
 			interface_to_usbdev(to_usb_interface(dev->parent->parent));
 	struct arvo_key_mask temp_buf;
 	int retval;

 	mutex_lock(&arvo->arvo_lock);
 	retval = roccat_common_receive(usb_dev, ARVO_USB_COMMAND_KEY_MASK,
 			&temp_buf, sizeof(struct arvo_key_mask));
 	mutex_unlock(&arvo->arvo_lock);
 	if (retval)
 		return retval;

 	return snprintf(buf, PAGE_SIZE, "%d\n", temp_buf.key_mask);
 }

 static ssize_t arvo_sysfs_set_key_mask(struct device *dev,
 		struct device_attribute *attr, char const *buf, size_t size)
 {
 	struct arvo_device *arvo =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
 	struct usb_device *usb_dev =
 			interface_to_usbdev(to_usb_interface(dev->parent->parent));
 	struct arvo_key_mask temp_buf;
 	unsigned long key_mask;
 	int retval;

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

 	temp_buf.command = ARVO_COMMAND_KEY_MASK;
 	temp_buf.key_mask = key_mask;

 	mutex_lock(&arvo->arvo_lock);
 	retval = roccat_common_send(usb_dev, ARVO_USB_COMMAND_KEY_MASK,
 			&temp_buf, sizeof(struct arvo_key_mask));
 	mutex_unlock(&arvo->arvo_lock);
 	if (retval)
 		return retval;

 	return size;
 }

 /* retval is 1-5 on success, < 0 on error */
 static int arvo_get_actual_profile(struct usb_device *usb_dev)
 {
 	struct arvo_actual_profile temp_buf;
 	int retval;

 	retval = roccat_common_receive(usb_dev, ARVO_USB_COMMAND_ACTUAL_PROFILE,
 			&temp_buf, sizeof(struct arvo_actual_profile));

 	if (retval)
 		return retval;

 	return temp_buf.actual_profile;
 }

 static ssize_t arvo_sysfs_show_actual_profile(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct arvo_device *arvo =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));

 	return snprintf(buf, PAGE_SIZE, "%d\n", arvo->actual_profile);
 }

 static ssize_t arvo_sysfs_set_actual_profile(struct device *dev,
 		struct device_attribute *attr, char const *buf, size_t size)
 {
 	struct arvo_device *arvo =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
 	struct usb_device *usb_dev =
 			interface_to_usbdev(to_usb_interface(dev->parent->parent));
 	struct arvo_actual_profile temp_buf;
 	unsigned long profile;
 	int retval;

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

 	temp_buf.command = ARVO_COMMAND_ACTUAL_PROFILE;
 	temp_buf.actual_profile = profile;

 	mutex_lock(&arvo->arvo_lock);
 	retval = roccat_common_send(usb_dev, ARVO_USB_COMMAND_ACTUAL_PROFILE,
 			&temp_buf, sizeof(struct arvo_actual_profile));
 	if (!retval) {
 		arvo->actual_profile = profile;
 		retval = size;
 	}
 	mutex_unlock(&arvo->arvo_lock);
 	return retval;
 }

 static ssize_t arvo_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 arvo_device *arvo = 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(&arvo->arvo_lock);
 	retval = roccat_common_send(usb_dev, command, buf, real_size);
 	mutex_unlock(&arvo->arvo_lock);

 	return (retval ? retval : real_size);
 }

 static ssize_t arvo_sysfs_read(struct file *fp,
 		struct kobject *kobj, void *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 arvo_device *arvo = 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(&arvo->arvo_lock);
 	retval = roccat_common_receive(usb_dev, command, buf, real_size);
 	mutex_unlock(&arvo->arvo_lock);

 	return (retval ? retval : real_size);
 }

 static ssize_t arvo_sysfs_write_button(struct file *fp,
 		struct kobject *kobj, struct bin_attribute *attr, char *buf,
 		loff_t off, size_t count)
 {
 	return arvo_sysfs_write(fp, kobj, buf, off, count,
 			sizeof(struct arvo_button), ARVO_USB_COMMAND_BUTTON);
 }

 static ssize_t arvo_sysfs_read_info(struct file *fp,
 		struct kobject *kobj, struct bin_attribute *attr, char *buf,
 		loff_t off, size_t count)
 {
 	return arvo_sysfs_read(fp, kobj, buf, off, count,
 			sizeof(struct arvo_info), ARVO_USB_COMMAND_INFO);
 }


 static struct device_attribute arvo_attributes[] = {
 	__ATTR(mode_key, 0660,
 			arvo_sysfs_show_mode_key, arvo_sysfs_set_mode_key),
 	__ATTR(key_mask, 0660,
 			arvo_sysfs_show_key_mask, arvo_sysfs_set_key_mask),
 	__ATTR(actual_profile, 0660,
 			arvo_sysfs_show_actual_profile,
 			arvo_sysfs_set_actual_profile),
 	__ATTR_NULL
 };

 static struct bin_attribute arvo_bin_attributes[] = {
 	{
 		.attr = { .name = "button", .mode = 0220 },
 		.size = sizeof(struct arvo_button),
 		.write = arvo_sysfs_write_button
 	},
 	{
 		.attr = { .name = "info", .mode = 0440 },
 		.size = sizeof(struct arvo_info),
 		.read = arvo_sysfs_read_info
 	},
 	__ATTR_NULL
 };

 static int arvo_init_arvo_device_struct(struct usb_device *usb_dev,
 		struct arvo_device *arvo)
 {
 	int retval;

 	mutex_init(&arvo->arvo_lock);

 	retval = arvo_get_actual_profile(usb_dev);
 	if (retval < 0)
 		return retval;
 	arvo->actual_profile = retval;

 	return 0;
 }

 static int arvo_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 arvo_device *arvo;
 	int retval;

 	if (intf->cur_altsetting->desc.bInterfaceProtocol
 			== USB_INTERFACE_PROTOCOL_KEYBOARD) {
 		hid_set_drvdata(hdev, NULL);
 		return 0;
 	}

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

 	retval = arvo_init_arvo_device_struct(usb_dev, arvo);
 	if (retval) {
 		hid_err(hdev, "couldn't init struct arvo_device\n");
 		goto exit_free;
 	}

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

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

 static void arvo_remove_specials(struct hid_device *hdev)
 {
 	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 	struct arvo_device *arvo;

 	if (intf->cur_altsetting->desc.bInterfaceProtocol
 			== USB_INTERFACE_PROTOCOL_KEYBOARD)
 		return;

 	arvo = hid_get_drvdata(hdev);
 	if (arvo->roccat_claimed)
 		roccat_disconnect(arvo->chrdev_minor);
 	kfree(arvo);
 }

 static int arvo_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 = arvo_init_specials(hdev);
 	if (retval) {
 		hid_err(hdev, "couldn't install keyboard\n");
 		goto exit_stop;
 	}

 	return 0;

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

 static void arvo_remove(struct hid_device *hdev)
 {
 	arvo_remove_specials(hdev);
 	hid_hw_stop(hdev);
 }

 static void arvo_report_to_chrdev(struct arvo_device const *arvo,
 		u8 const *data)
 {
 	struct arvo_special_report const *special_report;
 	struct arvo_roccat_report roccat_report;

 	special_report = (struct arvo_special_report const *)data;

 	roccat_report.profile = arvo->actual_profile;
 	roccat_report.button = special_report->event &
 			ARVO_SPECIAL_REPORT_EVENT_MASK_BUTTON;
 	if ((special_report->event & ARVO_SPECIAL_REPORT_EVENT_MASK_ACTION) ==
 			ARVO_SPECIAL_REPORT_EVENT_ACTION_PRESS)
 		roccat_report.action = ARVO_ROCCAT_REPORT_ACTION_PRESS;
 	else
 		roccat_report.action = ARVO_ROCCAT_REPORT_ACTION_RELEASE;

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

 static int arvo_raw_event(struct hid_device *hdev,
 		struct hid_report *report, u8 *data, int size)
 {
 	struct arvo_device *arvo = hid_get_drvdata(hdev);

 	if (size != 3)
 		return 0;

 	if (arvo->roccat_claimed)
 		arvo_report_to_chrdev(arvo, data);

 	return 0;
 }

 static const struct hid_device_id arvo_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_ARVO) },
 	{ }
 };

 MODULE_DEVICE_TABLE(hid, arvo_devices);

 static struct hid_driver arvo_driver = {
 	.name = "arvo",
 	.id_table = arvo_devices,
 	.probe = arvo_probe,
 	.remove = arvo_remove,
 	.raw_event = arvo_raw_event
 };

 static int __init arvo_init(void)
 {
 	int retval;

 	arvo_class = class_create(THIS_MODULE, "arvo");
 	if (IS_ERR(arvo_class))
 		return PTR_ERR(arvo_class);
 	arvo_class->dev_attrs = arvo_attributes;
 	arvo_class->dev_bin_attrs = arvo_bin_attributes;

 	retval = hid_register_driver(&arvo_driver);
 	if (retval)
 		class_destroy(arvo_class);
 	return retval;
 }

 static void __exit arvo_exit(void)
 {
 	class_destroy(arvo_class);
 	hid_unregister_driver(&arvo_driver);
 }

 module_init(arvo_init);
 module_exit(arvo_exit);

 MODULE_AUTHOR("Stefan Achatz");
 MODULE_DESCRIPTION("USB Roccat Arvo driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Roccat Arvo 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 Arvo is a gamer keyboard with 5 macro keys that can be configured in
	* 5 profiles.
	*/

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

	static struct class *arvo_class;

	static ssize_t arvo_sysfs_show_mode_key(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct arvo_device *arvo =
	hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	struct usb_device *usb_dev =
	interface_to_usbdev(to_usb_interface(dev->parent->parent));
	struct arvo_mode_key temp_buf;
	int retval;

	mutex_lock(&arvo->arvo_lock);
	retval = roccat_common_receive(usb_dev, ARVO_USB_COMMAND_MODE_KEY,
	&temp_buf, sizeof(struct arvo_mode_key));
	mutex_unlock(&arvo->arvo_lock);
	if (retval)
	return retval;

	return snprintf(buf, PAGE_SIZE, "%d\n", temp_buf.state);
	}

	static ssize_t arvo_sysfs_set_mode_key(struct device *dev,
	struct device_attribute attr, char const buf, size_t size)
	{
	struct arvo_device *arvo =
	hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	struct usb_device *usb_dev =
	interface_to_usbdev(to_usb_interface(dev->parent->parent));
	struct arvo_mode_key temp_buf;
	unsigned long state;
	int retval;

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

	temp_buf.command = ARVO_COMMAND_MODE_KEY;
	temp_buf.state = state;

	mutex_lock(&arvo->arvo_lock);
	retval = roccat_common_send(usb_dev, ARVO_USB_COMMAND_MODE_KEY,
	&temp_buf, sizeof(struct arvo_mode_key));
	mutex_unlock(&arvo->arvo_lock);
	if (retval)
	return retval;

	return size;
	}

	static ssize_t arvo_sysfs_show_key_mask(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct arvo_device *arvo =
	hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	struct usb_device *usb_dev =
	interface_to_usbdev(to_usb_interface(dev->parent->parent));
	struct arvo_key_mask temp_buf;
	int retval;

	mutex_lock(&arvo->arvo_lock);
	retval = roccat_common_receive(usb_dev, ARVO_USB_COMMAND_KEY_MASK,
	&temp_buf, sizeof(struct arvo_key_mask));
	mutex_unlock(&arvo->arvo_lock);
	if (retval)
	return retval;

	return snprintf(buf, PAGE_SIZE, "%d\n", temp_buf.key_mask);
	}

	static ssize_t arvo_sysfs_set_key_mask(struct device *dev,
	struct device_attribute attr, char const buf, size_t size)
	{
	struct arvo_device *arvo =
	hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	struct usb_device *usb_dev =
	interface_to_usbdev(to_usb_interface(dev->parent->parent));
	struct arvo_key_mask temp_buf;
	unsigned long key_mask;
	int retval;

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

	temp_buf.command = ARVO_COMMAND_KEY_MASK;
	temp_buf.key_mask = key_mask;

	mutex_lock(&arvo->arvo_lock);
	retval = roccat_common_send(usb_dev, ARVO_USB_COMMAND_KEY_MASK,
	&temp_buf, sizeof(struct arvo_key_mask));
	mutex_unlock(&arvo->arvo_lock);
	if (retval)
	return retval;

	return size;
	}

	/* retval is 1-5 on success, < 0 on error */
	static int arvo_get_actual_profile(struct usb_device *usb_dev)
	{
	struct arvo_actual_profile temp_buf;
	int retval;

	retval = roccat_common_receive(usb_dev, ARVO_USB_COMMAND_ACTUAL_PROFILE,
	&temp_buf, sizeof(struct arvo_actual_profile));

	if (retval)
	return retval;

	return temp_buf.actual_profile;
	}

	static ssize_t arvo_sysfs_show_actual_profile(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct arvo_device *arvo =
	hid_get_drvdata(dev_get_drvdata(dev->parent->parent));

	return snprintf(buf, PAGE_SIZE, "%d\n", arvo->actual_profile);
	}

	static ssize_t arvo_sysfs_set_actual_profile(struct device *dev,
	struct device_attribute attr, char const buf, size_t size)
	{
	struct arvo_device *arvo =
	hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
	struct usb_device *usb_dev =
	interface_to_usbdev(to_usb_interface(dev->parent->parent));
	struct arvo_actual_profile temp_buf;
	unsigned long profile;
	int retval;

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

	temp_buf.command = ARVO_COMMAND_ACTUAL_PROFILE;
	temp_buf.actual_profile = profile;

	mutex_lock(&arvo->arvo_lock);
	retval = roccat_common_send(usb_dev, ARVO_USB_COMMAND_ACTUAL_PROFILE,
	&temp_buf, sizeof(struct arvo_actual_profile));
	if (!retval) {
	arvo->actual_profile = profile;
	retval = size;
	}
	mutex_unlock(&arvo->arvo_lock);
	return retval;
	}

	static ssize_t arvo_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 arvo_device *arvo = 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(&arvo->arvo_lock);
	retval = roccat_common_send(usb_dev, command, buf, real_size);
	mutex_unlock(&arvo->arvo_lock);

	return (retval ? retval : real_size);
	}

	static ssize_t arvo_sysfs_read(struct file *fp,
	struct kobject kobj, void 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 arvo_device *arvo = 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(&arvo->arvo_lock);
	retval = roccat_common_receive(usb_dev, command, buf, real_size);
	mutex_unlock(&arvo->arvo_lock);

	return (retval ? retval : real_size);
	}

	static ssize_t arvo_sysfs_write_button(struct file *fp,
	struct kobject kobj, struct bin_attribute attr, char *buf,
	loff_t off, size_t count)
	{
	return arvo_sysfs_write(fp, kobj, buf, off, count,
	sizeof(struct arvo_button), ARVO_USB_COMMAND_BUTTON);
	}

	static ssize_t arvo_sysfs_read_info(struct file *fp,
	struct kobject kobj, struct bin_attribute attr, char *buf,
	loff_t off, size_t count)
	{
	return arvo_sysfs_read(fp, kobj, buf, off, count,
	sizeof(struct arvo_info), ARVO_USB_COMMAND_INFO);
	}


	static struct device_attribute arvo_attributes[] = {
	__ATTR(mode_key, 0660,
	arvo_sysfs_show_mode_key, arvo_sysfs_set_mode_key),
	__ATTR(key_mask, 0660,
	arvo_sysfs_show_key_mask, arvo_sysfs_set_key_mask),
	__ATTR(actual_profile, 0660,
	arvo_sysfs_show_actual_profile,
	arvo_sysfs_set_actual_profile),
	__ATTR_NULL
	};

	static struct bin_attribute arvo_bin_attributes[] = {
	{
	.attr = { .name = "button", .mode = 0220 },
	.size = sizeof(struct arvo_button),
	.write = arvo_sysfs_write_button
	},
	{
	.attr = { .name = "info", .mode = 0440 },
	.size = sizeof(struct arvo_info),
	.read = arvo_sysfs_read_info
	},
	__ATTR_NULL
	};

	static int arvo_init_arvo_device_struct(struct usb_device *usb_dev,
	struct arvo_device *arvo)
	{
	int retval;

	mutex_init(&arvo->arvo_lock);

	retval = arvo_get_actual_profile(usb_dev);
	if (retval < 0)
	return retval;
	arvo->actual_profile = retval;

	return 0;
	}

	static int arvo_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 arvo_device *arvo;
	int retval;

	if (intf->cur_altsetting->desc.bInterfaceProtocol
	== USB_INTERFACE_PROTOCOL_KEYBOARD) {
	hid_set_drvdata(hdev, NULL);
	return 0;
	}

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

	retval = arvo_init_arvo_device_struct(usb_dev, arvo);
	if (retval) {
	hid_err(hdev, "couldn't init struct arvo_device\n");
	goto exit_free;
	}

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

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

	static void arvo_remove_specials(struct hid_device *hdev)
	{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	struct arvo_device *arvo;

	if (intf->cur_altsetting->desc.bInterfaceProtocol
	== USB_INTERFACE_PROTOCOL_KEYBOARD)
	return;

	arvo = hid_get_drvdata(hdev);
	if (arvo->roccat_claimed)
	roccat_disconnect(arvo->chrdev_minor);
	kfree(arvo);
	}

	static int arvo_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 = arvo_init_specials(hdev);
	if (retval) {
	hid_err(hdev, "couldn't install keyboard\n");
	goto exit_stop;
	}

	return 0;

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

	static void arvo_remove(struct hid_device *hdev)
	{
	arvo_remove_specials(hdev);
	hid_hw_stop(hdev);
	}

	static void arvo_report_to_chrdev(struct arvo_device const *arvo,
	u8 const *data)
	{
	struct arvo_special_report const *special_report;
	struct arvo_roccat_report roccat_report;

	special_report = (struct arvo_special_report const *)data;

	roccat_report.profile = arvo->actual_profile;
	roccat_report.button = special_report->event &
	ARVO_SPECIAL_REPORT_EVENT_MASK_BUTTON;
	if ((special_report->event & ARVO_SPECIAL_REPORT_EVENT_MASK_ACTION) ==
	ARVO_SPECIAL_REPORT_EVENT_ACTION_PRESS)
	roccat_report.action = ARVO_ROCCAT_REPORT_ACTION_PRESS;
	else
	roccat_report.action = ARVO_ROCCAT_REPORT_ACTION_RELEASE;

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

	static int arvo_raw_event(struct hid_device *hdev,
	struct hid_report report, u8 data, int size)
	{
	struct arvo_device *arvo = hid_get_drvdata(hdev);

	if (size != 3)
	return 0;

	if (arvo->roccat_claimed)
	arvo_report_to_chrdev(arvo, data);

	return 0;
	}

	static const struct hid_device_id arvo_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_ARVO) },
	{ }
	};

	MODULE_DEVICE_TABLE(hid, arvo_devices);

	static struct hid_driver arvo_driver = {
	.name = "arvo",
	.id_table = arvo_devices,
	.probe = arvo_probe,
	.remove = arvo_remove,
	.raw_event = arvo_raw_event
	};

	static int __init arvo_init(void)
	{
	int retval;

	arvo_class = class_create(THIS_MODULE, "arvo");
	if (IS_ERR(arvo_class))
	return PTR_ERR(arvo_class);
	arvo_class->dev_attrs = arvo_attributes;
	arvo_class->dev_bin_attrs = arvo_bin_attributes;

	retval = hid_register_driver(&arvo_driver);
	if (retval)
	class_destroy(arvo_class);
	return retval;
	}

	static void __exit arvo_exit(void)
	{
	class_destroy(arvo_class);
	hid_unregister_driver(&arvo_driver);
	}

	module_init(arvo_init);
	module_exit(arvo_exit);

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