drivers/hid/hid-roccat-isku.c - linux/kernel/git/gregkh/usb - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Roccat Isku driver for Linux
  *
  * Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
  */

 /*
  */

 /*
  * Roccat Isku is a gamer keyboard with 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/hid-roccat.h>
 #include "hid-ids.h"
 #include "hid-roccat-common.h"
 #include "hid-roccat-isku.h"

 static struct class *isku_class;

 static void isku_profile_activated(struct isku_device *isku, uint new_profile)
 {
 	isku->actual_profile = new_profile;
 }

 static int isku_receive(struct usb_device *usb_dev, uint command,
 		void *buf, uint size)
 {
 	return roccat_common2_receive(usb_dev, command, buf, size);
 }

 static int isku_get_actual_profile(struct usb_device *usb_dev)
 {
 	struct isku_actual_profile buf;
 	int retval;

 	retval = isku_receive(usb_dev, ISKU_COMMAND_ACTUAL_PROFILE,
 			&buf, sizeof(struct isku_actual_profile));
 	return retval ? retval : buf.actual_profile;
 }

 static int isku_set_actual_profile(struct usb_device *usb_dev, int new_profile)
 {
 	struct isku_actual_profile buf;

 	buf.command = ISKU_COMMAND_ACTUAL_PROFILE;
 	buf.size = sizeof(struct isku_actual_profile);
 	buf.actual_profile = new_profile;
 	return roccat_common2_send_with_status(usb_dev,
 			ISKU_COMMAND_ACTUAL_PROFILE, &buf,
 			sizeof(struct isku_actual_profile));
 }

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

 static ssize_t isku_sysfs_set_actual_profile(struct device *dev,
 		struct device_attribute *attr, char const *buf, size_t size)
 {
 	struct isku_device *isku;
 	struct usb_device *usb_dev;
 	unsigned long profile;
 	int retval;
 	struct isku_roccat_report roccat_report;

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

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

 	if (profile > 4)
 		return -EINVAL;

 	mutex_lock(&isku->isku_lock);

 	retval = isku_set_actual_profile(usb_dev, profile);
 	if (retval) {
 		mutex_unlock(&isku->isku_lock);
 		return retval;
 	}

 	isku_profile_activated(isku, profile);

 	roccat_report.event = ISKU_REPORT_BUTTON_EVENT_PROFILE;
 	roccat_report.data1 = profile + 1;
 	roccat_report.data2 = 0;
 	roccat_report.profile = profile + 1;
 	roccat_report_event(isku->chrdev_minor, (uint8_t const *)&roccat_report);

 	mutex_unlock(&isku->isku_lock);

 	return size;
 }
 static DEVICE_ATTR(actual_profile, 0660, isku_sysfs_show_actual_profile,
 		   isku_sysfs_set_actual_profile);

 static struct attribute *isku_attrs[] = {
 	&dev_attr_actual_profile.attr,
 	NULL,
 };

 static ssize_t isku_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 = kobj_to_dev(kobj)->parent->parent;
 	struct isku_device *isku = 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(&isku->isku_lock);
 	retval = isku_receive(usb_dev, command, buf, count);
 	mutex_unlock(&isku->isku_lock);

 	return retval ? retval : count;
 }

 static ssize_t isku_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 = kobj_to_dev(kobj)->parent->parent;
 	struct isku_device *isku = 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(&isku->isku_lock);
 	retval = roccat_common2_send_with_status(usb_dev, command,
 			(void *)buf, count);
 	mutex_unlock(&isku->isku_lock);

 	return retval ? retval : count;
 }

 #define ISKU_SYSFS_W(thingy, THINGY) \
 static ssize_t isku_sysfs_write_ ## thingy(struct file *fp, struct kobject *kobj, \
 		struct bin_attribute *attr, char *buf, \
 		loff_t off, size_t count) \
 { \
 	return isku_sysfs_write(fp, kobj, buf, off, count, \
 			ISKU_SIZE_ ## THINGY, ISKU_COMMAND_ ## THINGY); \
 }

 #define ISKU_SYSFS_R(thingy, THINGY) \
 static ssize_t isku_sysfs_read_ ## thingy(struct file *fp, struct kobject *kobj, \
 		struct bin_attribute *attr, char *buf, \
 		loff_t off, size_t count) \
 { \
 	return isku_sysfs_read(fp, kobj, buf, off, count, \
 			ISKU_SIZE_ ## THINGY, ISKU_COMMAND_ ## THINGY); \
 }

 #define ISKU_SYSFS_RW(thingy, THINGY) \
 ISKU_SYSFS_R(thingy, THINGY) \
 ISKU_SYSFS_W(thingy, THINGY)

 #define ISKU_BIN_ATTR_RW(thingy, THINGY) \
 ISKU_SYSFS_RW(thingy, THINGY); \
 static struct bin_attribute bin_attr_##thingy = { \
 	.attr = { .name = #thingy, .mode = 0660 }, \
 	.size = ISKU_SIZE_ ## THINGY, \
 	.read = isku_sysfs_read_ ## thingy, \
 	.write = isku_sysfs_write_ ## thingy \
 }

 #define ISKU_BIN_ATTR_R(thingy, THINGY) \
 ISKU_SYSFS_R(thingy, THINGY); \
 static struct bin_attribute bin_attr_##thingy = { \
 	.attr = { .name = #thingy, .mode = 0440 }, \
 	.size = ISKU_SIZE_ ## THINGY, \
 	.read = isku_sysfs_read_ ## thingy, \
 }

 #define ISKU_BIN_ATTR_W(thingy, THINGY) \
 ISKU_SYSFS_W(thingy, THINGY); \
 static struct bin_attribute bin_attr_##thingy = { \
 	.attr = { .name = #thingy, .mode = 0220 }, \
 	.size = ISKU_SIZE_ ## THINGY, \
 	.write = isku_sysfs_write_ ## thingy \
 }

 ISKU_BIN_ATTR_RW(macro, MACRO);
 ISKU_BIN_ATTR_RW(keys_function, KEYS_FUNCTION);
 ISKU_BIN_ATTR_RW(keys_easyzone, KEYS_EASYZONE);
 ISKU_BIN_ATTR_RW(keys_media, KEYS_MEDIA);
 ISKU_BIN_ATTR_RW(keys_thumbster, KEYS_THUMBSTER);
 ISKU_BIN_ATTR_RW(keys_macro, KEYS_MACRO);
 ISKU_BIN_ATTR_RW(keys_capslock, KEYS_CAPSLOCK);
 ISKU_BIN_ATTR_RW(light, LIGHT);
 ISKU_BIN_ATTR_RW(key_mask, KEY_MASK);
 ISKU_BIN_ATTR_RW(last_set, LAST_SET);
 ISKU_BIN_ATTR_W(talk, TALK);
 ISKU_BIN_ATTR_W(talkfx, TALKFX);
 ISKU_BIN_ATTR_W(control, CONTROL);
 ISKU_BIN_ATTR_W(reset, RESET);
 ISKU_BIN_ATTR_R(info, INFO);

 static struct bin_attribute *isku_bin_attributes[] = {
 	&bin_attr_macro,
 	&bin_attr_keys_function,
 	&bin_attr_keys_easyzone,
 	&bin_attr_keys_media,
 	&bin_attr_keys_thumbster,
 	&bin_attr_keys_macro,
 	&bin_attr_keys_capslock,
 	&bin_attr_light,
 	&bin_attr_key_mask,
 	&bin_attr_last_set,
 	&bin_attr_talk,
 	&bin_attr_talkfx,
 	&bin_attr_control,
 	&bin_attr_reset,
 	&bin_attr_info,
 	NULL,
 };

 static const struct attribute_group isku_group = {
 	.attrs = isku_attrs,
 	.bin_attrs = isku_bin_attributes,
 };

 static const struct attribute_group *isku_groups[] = {
 	&isku_group,
 	NULL,
 };

 static int isku_init_isku_device_struct(struct usb_device *usb_dev,
 		struct isku_device *isku)
 {
 	int retval;

 	mutex_init(&isku->isku_lock);

 	retval = isku_get_actual_profile(usb_dev);
 	if (retval < 0)
 		return retval;
 	isku_profile_activated(isku, retval);

 	return 0;
 }

 static int isku_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 isku_device *isku;
 	int retval;

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

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

 	retval = isku_init_isku_device_struct(usb_dev, isku);
 	if (retval) {
 		hid_err(hdev, "couldn't init struct isku_device\n");
 		goto exit_free;
 	}

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

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

 static void isku_remove_specials(struct hid_device *hdev)
 {
 	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 	struct isku_device *isku;

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

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

 static int isku_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 = isku_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 isku_remove(struct hid_device *hdev)
 {
 	isku_remove_specials(hdev);
 	hid_hw_stop(hdev);
 }

 static void isku_keep_values_up_to_date(struct isku_device *isku,
 		u8 const *data)
 {
 	struct isku_report_button const *button_report;

 	switch (data[0]) {
 	case ISKU_REPORT_NUMBER_BUTTON:
 		button_report = (struct isku_report_button const *)data;
 		switch (button_report->event) {
 		case ISKU_REPORT_BUTTON_EVENT_PROFILE:
 			isku_profile_activated(isku, button_report->data1 - 1);
 			break;
 		}
 		break;
 	}
 }

 static void isku_report_to_chrdev(struct isku_device const *isku,
 		u8 const *data)
 {
 	struct isku_roccat_report roccat_report;
 	struct isku_report_button const *button_report;

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

 	button_report = (struct isku_report_button const *)data;

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

 static int isku_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 isku_device *isku = hid_get_drvdata(hdev);

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

 	if (isku == NULL)
 		return 0;

 	isku_keep_values_up_to_date(isku, data);

 	if (isku->roccat_claimed)
 		isku_report_to_chrdev(isku, data);

 	return 0;
 }

 static const struct hid_device_id isku_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_ISKU) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_ISKUFX) },
 	{ }
 };

 MODULE_DEVICE_TABLE(hid, isku_devices);

 static struct hid_driver isku_driver = {
 		.name = "isku",
 		.id_table = isku_devices,
 		.probe = isku_probe,
 		.remove = isku_remove,
 		.raw_event = isku_raw_event
 };

 static int __init isku_init(void)
 {
 	int retval;
 	isku_class = class_create(THIS_MODULE, "isku");
 	if (IS_ERR(isku_class))
 		return PTR_ERR(isku_class);
 	isku_class->dev_groups = isku_groups;

 	retval = hid_register_driver(&isku_driver);
 	if (retval)
 		class_destroy(isku_class);
 	return retval;
 }

 static void __exit isku_exit(void)
 {
 	hid_unregister_driver(&isku_driver);
 	class_destroy(isku_class);
 }

 module_init(isku_init);
 module_exit(isku_exit);

 MODULE_AUTHOR("Stefan Achatz");
 MODULE_DESCRIPTION("USB Roccat Isku/FX driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Roccat Isku driver for Linux
	*
	* Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
	*/

	/*
	*/

	/*
	* Roccat Isku is a gamer keyboard with 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/hid-roccat.h>
	#include "hid-ids.h"
	#include "hid-roccat-common.h"
	#include "hid-roccat-isku.h"

	static struct class *isku_class;

	static void isku_profile_activated(struct isku_device *isku, uint new_profile)
	{
	isku->actual_profile = new_profile;
	}

	static int isku_receive(struct usb_device *usb_dev, uint command,
	void *buf, uint size)
	{
	return roccat_common2_receive(usb_dev, command, buf, size);
	}

	static int isku_get_actual_profile(struct usb_device *usb_dev)
	{
	struct isku_actual_profile buf;
	int retval;

	retval = isku_receive(usb_dev, ISKU_COMMAND_ACTUAL_PROFILE,
	&buf, sizeof(struct isku_actual_profile));
	return retval ? retval : buf.actual_profile;
	}

	static int isku_set_actual_profile(struct usb_device *usb_dev, int new_profile)
	{
	struct isku_actual_profile buf;

	buf.command = ISKU_COMMAND_ACTUAL_PROFILE;
	buf.size = sizeof(struct isku_actual_profile);
	buf.actual_profile = new_profile;
	return roccat_common2_send_with_status(usb_dev,
	ISKU_COMMAND_ACTUAL_PROFILE, &buf,
	sizeof(struct isku_actual_profile));
	}

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

	static ssize_t isku_sysfs_set_actual_profile(struct device *dev,
	struct device_attribute attr, char const buf, size_t size)
	{
	struct isku_device *isku;
	struct usb_device *usb_dev;
	unsigned long profile;
	int retval;
	struct isku_roccat_report roccat_report;

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

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

	if (profile > 4)
	return -EINVAL;

	mutex_lock(&isku->isku_lock);

	retval = isku_set_actual_profile(usb_dev, profile);
	if (retval) {
	mutex_unlock(&isku->isku_lock);
	return retval;
	}

	isku_profile_activated(isku, profile);

	roccat_report.event = ISKU_REPORT_BUTTON_EVENT_PROFILE;
	roccat_report.data1 = profile + 1;
	roccat_report.data2 = 0;
	roccat_report.profile = profile + 1;
	roccat_report_event(isku->chrdev_minor, (uint8_t const *)&roccat_report);

	mutex_unlock(&isku->isku_lock);

	return size;
	}
	static DEVICE_ATTR(actual_profile, 0660, isku_sysfs_show_actual_profile,
	isku_sysfs_set_actual_profile);

	static struct attribute *isku_attrs[] = {
	&dev_attr_actual_profile.attr,
	NULL,
	};

	static ssize_t isku_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 = kobj_to_dev(kobj)->parent->parent;
	struct isku_device *isku = 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(&isku->isku_lock);
	retval = isku_receive(usb_dev, command, buf, count);
	mutex_unlock(&isku->isku_lock);

	return retval ? retval : count;
	}

	static ssize_t isku_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 = kobj_to_dev(kobj)->parent->parent;
	struct isku_device *isku = 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(&isku->isku_lock);
	retval = roccat_common2_send_with_status(usb_dev, command,
	(void *)buf, count);
	mutex_unlock(&isku->isku_lock);

	return retval ? retval : count;
	}

	#define ISKU_SYSFS_W(thingy, THINGY) \
	static ssize_t isku_sysfs_write_ ## thingy(struct file fp, struct kobject kobj, \
	struct bin_attribute attr, char buf, \
	loff_t off, size_t count) \
	{ \
	return isku_sysfs_write(fp, kobj, buf, off, count, \
	ISKU_SIZE_ ## THINGY, ISKU_COMMAND_ ## THINGY); \
	}

	#define ISKU_SYSFS_R(thingy, THINGY) \
	static ssize_t isku_sysfs_read_ ## thingy(struct file fp, struct kobject kobj, \
	struct bin_attribute attr, char buf, \
	loff_t off, size_t count) \
	{ \
	return isku_sysfs_read(fp, kobj, buf, off, count, \
	ISKU_SIZE_ ## THINGY, ISKU_COMMAND_ ## THINGY); \
	}

	#define ISKU_SYSFS_RW(thingy, THINGY) \
	ISKU_SYSFS_R(thingy, THINGY) \
	ISKU_SYSFS_W(thingy, THINGY)

	#define ISKU_BIN_ATTR_RW(thingy, THINGY) \
	ISKU_SYSFS_RW(thingy, THINGY); \
	static struct bin_attribute bin_attr_##thingy = { \
	.attr = { .name = #thingy, .mode = 0660 }, \
	.size = ISKU_SIZE_ ## THINGY, \
	.read = isku_sysfs_read_ ## thingy, \
	.write = isku_sysfs_write_ ## thingy \
	}

	#define ISKU_BIN_ATTR_R(thingy, THINGY) \
	ISKU_SYSFS_R(thingy, THINGY); \
	static struct bin_attribute bin_attr_##thingy = { \
	.attr = { .name = #thingy, .mode = 0440 }, \
	.size = ISKU_SIZE_ ## THINGY, \
	.read = isku_sysfs_read_ ## thingy, \
	}

	#define ISKU_BIN_ATTR_W(thingy, THINGY) \
	ISKU_SYSFS_W(thingy, THINGY); \
	static struct bin_attribute bin_attr_##thingy = { \
	.attr = { .name = #thingy, .mode = 0220 }, \
	.size = ISKU_SIZE_ ## THINGY, \
	.write = isku_sysfs_write_ ## thingy \
	}

	ISKU_BIN_ATTR_RW(macro, MACRO);
	ISKU_BIN_ATTR_RW(keys_function, KEYS_FUNCTION);
	ISKU_BIN_ATTR_RW(keys_easyzone, KEYS_EASYZONE);
	ISKU_BIN_ATTR_RW(keys_media, KEYS_MEDIA);
	ISKU_BIN_ATTR_RW(keys_thumbster, KEYS_THUMBSTER);
	ISKU_BIN_ATTR_RW(keys_macro, KEYS_MACRO);
	ISKU_BIN_ATTR_RW(keys_capslock, KEYS_CAPSLOCK);
	ISKU_BIN_ATTR_RW(light, LIGHT);
	ISKU_BIN_ATTR_RW(key_mask, KEY_MASK);
	ISKU_BIN_ATTR_RW(last_set, LAST_SET);
	ISKU_BIN_ATTR_W(talk, TALK);
	ISKU_BIN_ATTR_W(talkfx, TALKFX);
	ISKU_BIN_ATTR_W(control, CONTROL);
	ISKU_BIN_ATTR_W(reset, RESET);
	ISKU_BIN_ATTR_R(info, INFO);

	static struct bin_attribute *isku_bin_attributes[] = {
	&bin_attr_macro,
	&bin_attr_keys_function,
	&bin_attr_keys_easyzone,
	&bin_attr_keys_media,
	&bin_attr_keys_thumbster,
	&bin_attr_keys_macro,
	&bin_attr_keys_capslock,
	&bin_attr_light,
	&bin_attr_key_mask,
	&bin_attr_last_set,
	&bin_attr_talk,
	&bin_attr_talkfx,
	&bin_attr_control,
	&bin_attr_reset,
	&bin_attr_info,
	NULL,
	};

	static const struct attribute_group isku_group = {
	.attrs = isku_attrs,
	.bin_attrs = isku_bin_attributes,
	};

	static const struct attribute_group *isku_groups[] = {
	&isku_group,
	NULL,
	};

	static int isku_init_isku_device_struct(struct usb_device *usb_dev,
	struct isku_device *isku)
	{
	int retval;

	mutex_init(&isku->isku_lock);

	retval = isku_get_actual_profile(usb_dev);
	if (retval < 0)
	return retval;
	isku_profile_activated(isku, retval);

	return 0;
	}

	static int isku_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 isku_device *isku;
	int retval;

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

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

	retval = isku_init_isku_device_struct(usb_dev, isku);
	if (retval) {
	hid_err(hdev, "couldn't init struct isku_device\n");
	goto exit_free;
	}

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

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

	static void isku_remove_specials(struct hid_device *hdev)
	{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	struct isku_device *isku;

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

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

	static int isku_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 = isku_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 isku_remove(struct hid_device *hdev)
	{
	isku_remove_specials(hdev);
	hid_hw_stop(hdev);
	}

	static void isku_keep_values_up_to_date(struct isku_device *isku,
	u8 const *data)
	{
	struct isku_report_button const *button_report;

	switch (data[0]) {
	case ISKU_REPORT_NUMBER_BUTTON:
	button_report = (struct isku_report_button const *)data;
	switch (button_report->event) {
	case ISKU_REPORT_BUTTON_EVENT_PROFILE:
	isku_profile_activated(isku, button_report->data1 - 1);
	break;
	}
	break;
	}
	}

	static void isku_report_to_chrdev(struct isku_device const *isku,
	u8 const *data)
	{
	struct isku_roccat_report roccat_report;
	struct isku_report_button const *button_report;

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

	button_report = (struct isku_report_button const *)data;

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

	static int isku_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 isku_device *isku = hid_get_drvdata(hdev);

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

	if (isku == NULL)
	return 0;

	isku_keep_values_up_to_date(isku, data);

	if (isku->roccat_claimed)
	isku_report_to_chrdev(isku, data);

	return 0;
	}

	static const struct hid_device_id isku_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_ISKU) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_ISKUFX) },
	{ }
	};

	MODULE_DEVICE_TABLE(hid, isku_devices);

	static struct hid_driver isku_driver = {
	.name = "isku",
	.id_table = isku_devices,
	.probe = isku_probe,
	.remove = isku_remove,
	.raw_event = isku_raw_event
	};

	static int __init isku_init(void)
	{
	int retval;
	isku_class = class_create(THIS_MODULE, "isku");
	if (IS_ERR(isku_class))
	return PTR_ERR(isku_class);
	isku_class->dev_groups = isku_groups;

	retval = hid_register_driver(&isku_driver);
	if (retval)
	class_destroy(isku_class);
	return retval;
	}

	static void __exit isku_exit(void)
	{
	hid_unregister_driver(&isku_driver);
	class_destroy(isku_class);
	}

	module_init(isku_init);
	module_exit(isku_exit);

	MODULE_AUTHOR("Stefan Achatz");
	MODULE_DESCRIPTION("USB Roccat Isku/FX driver");
	MODULE_LICENSE("GPL v2");