/*
   * 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 an updated/improved version of the Kone with more memory
   * and functionality and without the non-standard behaviours the Kone had.
   * KoneXTD has same capabilities but updated sensor.
   */
  
  #include <linux/device.h>
  #include <linux/input.h>
  #include <linux/hid.h>
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/hid-roccat.h>
  #include "hid-ids.h"
  #include "hid-roccat-common.h"
  #include "hid-roccat-koneplus.h"
  
  static uint profile_numbers[5] = {0, 1, 2, 3, 4};
  
  static struct class *koneplus_class;
  
  static void koneplus_profile_activated(struct koneplus_device *koneplus,
  		uint new_profile)
  {
  	koneplus->actual_profile = new_profile;
  }
  
  static int koneplus_send_control(struct usb_device *usb_dev, uint value,
  		enum koneplus_control_requests request)
  {
  	struct roccat_common2_control control;
  
  	if ((request == KONEPLUS_CONTROL_REQUEST_PROFILE_SETTINGS ||
  			request == KONEPLUS_CONTROL_REQUEST_PROFILE_BUTTONS) &&
  			value > 4)
  		return -EINVAL;
  
  	control.command = ROCCAT_COMMON_COMMAND_CONTROL;
  	control.value = value;
  	control.request = request;
  
  	return roccat_common2_send_with_status(usb_dev,
  			ROCCAT_COMMON_COMMAND_CONTROL,
  			&control, sizeof(struct roccat_common2_control));
  }
  
  
  /* retval is 0-4 on success, < 0 on error */
  static int koneplus_get_actual_profile(struct usb_device *usb_dev)
  {
  	struct koneplus_actual_profile buf;
  	int retval;
  
  	retval = roccat_common2_receive(usb_dev, KONEPLUS_COMMAND_ACTUAL_PROFILE,
  			&buf, KONEPLUS_SIZE_ACTUAL_PROFILE);
  
  	return retval ? retval : buf.actual_profile;
  }
  
  static int koneplus_set_actual_profile(struct usb_device *usb_dev,
  		int new_profile)
  {
  	struct koneplus_actual_profile buf;
  
  	buf.command = KONEPLUS_COMMAND_ACTUAL_PROFILE;
  	buf.size = KONEPLUS_SIZE_ACTUAL_PROFILE;
  	buf.actual_profile = new_profile;
  
  	return roccat_common2_send_with_status(usb_dev,
  			KONEPLUS_COMMAND_ACTUAL_PROFILE,
  			&buf, KONEPLUS_SIZE_ACTUAL_PROFILE);
  }
  
  static ssize_t koneplus_sysfs_read(struct file *fp, struct kobject *kobj,
  		char *buf, loff_t off, size_t count,
  		size_t real_size, uint command)
  {
  	struct device *dev =
  			container_of(kobj, struct device, kobj)->parent->parent;
  	struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));
  	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
  	int retval;
  
  	if (off >= real_size)
  		return 0;
  
  	if (off != 0 || count != real_size)
  		return -EINVAL;
  
  	mutex_lock(&koneplus->koneplus_lock);
  	retval = roccat_common2_receive(usb_dev, command, buf, real_size);
  	mutex_unlock(&koneplus->koneplus_lock);
  
  	if (retval)
  		return retval;
  
  	return real_size;
  }
  
  static ssize_t koneplus_sysfs_write(struct file *fp, struct kobject *kobj,
  		void const *buf, loff_t off, size_t count,
  		size_t real_size, uint command)
  {
  	struct device *dev =
  			container_of(kobj, struct device, kobj)->parent->parent;
  	struct koneplus_device *koneplus = hid_get_drvdata(dev_get_drvdata(dev));
  	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
  	int retval;
  
  	if (off != 0 || count != real_size)
  		return -EINVAL;
  
  	mutex_lock(&koneplus->koneplus_lock);
  	retval = roccat_common2_send_with_status(usb_dev, command,
  			buf, real_size);
  	mutex_unlock(&koneplus->koneplus_lock);
  
  	if (retval)
  		return retval;
  
  	return real_size;
  }
  
  #define KONEPLUS_SYSFS_W(thingy, THINGY) \
  static ssize_t koneplus_sysfs_write_ ## thingy(struct file *fp, \
  		struct kobject *kobj, struct bin_attribute *attr, char *buf, \
  		loff_t off, size_t count) \
  { \
  	return koneplus_sysfs_write(fp, kobj, buf, off, count, \
  			KONEPLUS_SIZE_ ## THINGY, KONEPLUS_COMMAND_ ## THINGY); \
  }
  
  #define KONEPLUS_SYSFS_R(thingy, THINGY) \
  static ssize_t koneplus_sysfs_read_ ## thingy(struct file *fp, \
  		struct kobject *kobj, struct bin_attribute *attr, char *buf, \
  		loff_t off, size_t count) \
  { \
  	return koneplus_sysfs_read(fp, kobj, buf, off, count, \
  			KONEPLUS_SIZE_ ## THINGY, KONEPLUS_COMMAND_ ## THINGY); \
  }
  
  #define KONEPLUS_SYSFS_RW(thingy, THINGY) \
  KONEPLUS_SYSFS_W(thingy, THINGY) \
  KONEPLUS_SYSFS_R(thingy, THINGY)
  
  #define KONEPLUS_BIN_ATTRIBUTE_RW(thingy, THINGY) \
  KONEPLUS_SYSFS_RW(thingy, THINGY); \
  static struct bin_attribute bin_attr_##thingy = { \
  	.attr = { .name = #thingy, .mode = 0660 }, \
  	.size = KONEPLUS_SIZE_ ## THINGY, \
  	.read = koneplus_sysfs_read_ ## thingy, \
  	.write = koneplus_sysfs_write_ ## thingy \
  }
  
  #define KONEPLUS_BIN_ATTRIBUTE_R(thingy, THINGY) \
  KONEPLUS_SYSFS_R(thingy, THINGY); \
  static struct bin_attribute bin_attr_##thingy = { \
  	.attr = { .name = #thingy, .mode = 0440 }, \
  	.size = KONEPLUS_SIZE_ ## THINGY, \
  	.read = koneplus_sysfs_read_ ## thingy, \
  }
  
  #define KONEPLUS_BIN_ATTRIBUTE_W(thingy, THINGY) \
  KONEPLUS_SYSFS_W(thingy, THINGY); \
  static struct bin_attribute bin_attr_##thingy = { \
  	.attr = { .name = #thingy, .mode = 0220 }, \
  	.size = KONEPLUS_SIZE_ ## THINGY, \
  	.write = koneplus_sysfs_write_ ## thingy \
  }
  KONEPLUS_BIN_ATTRIBUTE_W(control, CONTROL);
  KONEPLUS_BIN_ATTRIBUTE_W(talk, TALK);
  KONEPLUS_BIN_ATTRIBUTE_W(macro, MACRO);
  KONEPLUS_BIN_ATTRIBUTE_R(tcu_image, TCU_IMAGE);
  KONEPLUS_BIN_ATTRIBUTE_RW(info, INFO);
  KONEPLUS_BIN_ATTRIBUTE_RW(sensor, SENSOR);
  KONEPLUS_BIN_ATTRIBUTE_RW(tcu, TCU);
  KONEPLUS_BIN_ATTRIBUTE_RW(profile_settings, PROFILE_SETTINGS);
  KONEPLUS_BIN_ATTRIBUTE_RW(profile_buttons, PROFILE_BUTTONS);
  
  static ssize_t koneplus_sysfs_read_profilex_settings(struct file *fp,
  		struct kobject *kobj, struct bin_attribute *attr, char *buf,
  		loff_t off, size_t count)
  {
  	struct device *dev =
  			container_of(kobj, struct device, kobj)->parent->parent;
  	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
  	ssize_t retval;
  
  	retval = koneplus_send_control(usb_dev, *(uint *)(attr->private),
  			KONEPLUS_CONTROL_REQUEST_PROFILE_SETTINGS);
  	if (retval)
  		return retval;
  
  	return koneplus_sysfs_read(fp, kobj, buf, off, count,
  			KONEPLUS_SIZE_PROFILE_SETTINGS,
  			KONEPLUS_COMMAND_PROFILE_SETTINGS);
  }
  
  static ssize_t koneplus_sysfs_read_profilex_buttons(struct file *fp,
  		struct kobject *kobj, struct bin_attribute *attr, char *buf,
  		loff_t off, size_t count)
  {
  	struct device *dev =
  			container_of(kobj, struct device, kobj)->parent->parent;
  	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
  	ssize_t retval;
  
  	retval = koneplus_send_control(usb_dev, *(uint *)(attr->private),
  			KONEPLUS_CONTROL_REQUEST_PROFILE_BUTTONS);
  	if (retval)
  		return retval;
  
  	return koneplus_sysfs_read(fp, kobj, buf, off, count,
  			KONEPLUS_SIZE_PROFILE_BUTTONS,
  			KONEPLUS_COMMAND_PROFILE_BUTTONS);
  }
  
  #define PROFILE_ATTR(number)						\
  static struct bin_attribute bin_attr_profile##number##_settings = {	\
  	.attr = { .name = "profile" #number "_settings", .mode = 0440 },	\
  	.size = KONEPLUS_SIZE_PROFILE_SETTINGS,				\
  	.read = koneplus_sysfs_read_profilex_settings,			\
  	.private = &profile_numbers[number-1],				\
  };									\
  static struct bin_attribute bin_attr_profile##number##_buttons = {	\
  	.attr = { .name = "profile" #number "_buttons", .mode = 0440 },	\
  	.size = KONEPLUS_SIZE_PROFILE_BUTTONS,				\
  	.read = koneplus_sysfs_read_profilex_buttons,			\
  	.private = &profile_numbers[number-1],				\
  };
  PROFILE_ATTR(1);
  PROFILE_ATTR(2);
  PROFILE_ATTR(3);
  PROFILE_ATTR(4);
  PROFILE_ATTR(5);
  
  static ssize_t koneplus_sysfs_show_actual_profile(struct device *dev,
  		struct device_attribute *attr, char *buf)
  {
  	struct koneplus_device *koneplus =
  			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
  	return snprintf(buf, PAGE_SIZE, "%d
  ", koneplus->actual_profile);
  }
  
  static ssize_t koneplus_sysfs_set_actual_profile(struct device *dev,
  		struct device_attribute *attr, char const *buf, size_t size)
  {
  	struct koneplus_device *koneplus;
  	struct usb_device *usb_dev;
  	unsigned long profile;
  	int retval;
  	struct koneplus_roccat_report roccat_report;
  
  	dev = dev->parent->parent;
  	koneplus = hid_get_drvdata(dev_get_drvdata(dev));
  	usb_dev = interface_to_usbdev(to_usb_interface(dev));
  
  	retval = kstrtoul(buf, 10, &profile);
  	if (retval)
  		return retval;
  
  	if (profile > 4)
  		return -EINVAL;
  
  	mutex_lock(&koneplus->koneplus_lock);
  
  	retval = koneplus_set_actual_profile(usb_dev, profile);
  	if (retval) {
  		mutex_unlock(&koneplus->koneplus_lock);
  		return retval;
  	}
  
  	koneplus_profile_activated(koneplus, profile);
  
  	roccat_report.type = KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_PROFILE;
  	roccat_report.data1 = profile + 1;
  	roccat_report.data2 = 0;
  	roccat_report.profile = profile + 1;
  	roccat_report_event(koneplus->chrdev_minor,
  			(uint8_t const *)&roccat_report);
  
  	mutex_unlock(&koneplus->koneplus_lock);
  
  	return size;
  }
  static DEVICE_ATTR(actual_profile, 0660,
  		   koneplus_sysfs_show_actual_profile,
  		   koneplus_sysfs_set_actual_profile);
  static DEVICE_ATTR(startup_profile, 0660,
  		   koneplus_sysfs_show_actual_profile,
  		   koneplus_sysfs_set_actual_profile);
  
  static ssize_t koneplus_sysfs_show_firmware_version(struct device *dev,
  		struct device_attribute *attr, char *buf)
  {
  	struct koneplus_device *koneplus;
  	struct usb_device *usb_dev;
  	struct koneplus_info info;
  
  	dev = dev->parent->parent;
  	koneplus = hid_get_drvdata(dev_get_drvdata(dev));
  	usb_dev = interface_to_usbdev(to_usb_interface(dev));
  
  	mutex_lock(&koneplus->koneplus_lock);
  	roccat_common2_receive(usb_dev, KONEPLUS_COMMAND_INFO,
  			&info, KONEPLUS_SIZE_INFO);
  	mutex_unlock(&koneplus->koneplus_lock);
  
  	return snprintf(buf, PAGE_SIZE, "%d
  ", info.firmware_version);
  }
  static DEVICE_ATTR(firmware_version, 0440,
  		   koneplus_sysfs_show_firmware_version, NULL);
  
  static struct attribute *koneplus_attrs[] = {
  	&dev_attr_actual_profile.attr,
  	&dev_attr_startup_profile.attr,
  	&dev_attr_firmware_version.attr,
  	NULL,
  };
  
  static struct bin_attribute *koneplus_bin_attributes[] = {
  	&bin_attr_control,
  	&bin_attr_talk,
  	&bin_attr_macro,
  	&bin_attr_tcu_image,
  	&bin_attr_info,
  	&bin_attr_sensor,
  	&bin_attr_tcu,
  	&bin_attr_profile_settings,
  	&bin_attr_profile_buttons,
  	&bin_attr_profile1_settings,
  	&bin_attr_profile2_settings,
  	&bin_attr_profile3_settings,
  	&bin_attr_profile4_settings,
  	&bin_attr_profile5_settings,
  	&bin_attr_profile1_buttons,
  	&bin_attr_profile2_buttons,
  	&bin_attr_profile3_buttons,
  	&bin_attr_profile4_buttons,
  	&bin_attr_profile5_buttons,
  	NULL,
  };
  
  static const struct attribute_group koneplus_group = {
  	.attrs = koneplus_attrs,
  	.bin_attrs = koneplus_bin_attributes,
  };
  
  static const struct attribute_group *koneplus_groups[] = {
  	&koneplus_group,
  	NULL,
  };
  
  static int koneplus_init_koneplus_device_struct(struct usb_device *usb_dev,
  		struct koneplus_device *koneplus)
  {
  	int retval;
  
  	mutex_init(&koneplus->koneplus_lock);
  
  	retval = koneplus_get_actual_profile(usb_dev);
  	if (retval < 0)
  		return retval;
  	koneplus_profile_activated(koneplus, retval);
  
  	return 0;
  }
  
  static int koneplus_init_specials(struct hid_device *hdev)
  {
  	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  	struct usb_device *usb_dev = interface_to_usbdev(intf);
  	struct koneplus_device *koneplus;
  	int retval;
  
  	if (intf->cur_altsetting->desc.bInterfaceProtocol
  			== USB_INTERFACE_PROTOCOL_MOUSE) {
  
  		koneplus = kzalloc(sizeof(*koneplus), GFP_KERNEL);
  		if (!koneplus) {
  			hid_err(hdev, "can't alloc device descriptor
  ");
  			return -ENOMEM;
  		}
  		hid_set_drvdata(hdev, koneplus);
  
  		retval = koneplus_init_koneplus_device_struct(usb_dev, koneplus);
  		if (retval) {
  			hid_err(hdev, "couldn't init struct koneplus_device
  ");
  			goto exit_free;
  		}
  
  		retval = roccat_connect(koneplus_class, hdev,
  				sizeof(struct koneplus_roccat_report));
  		if (retval < 0) {
  			hid_err(hdev, "couldn't init char dev
  ");
  		} else {
  			koneplus->chrdev_minor = retval;
  			koneplus->roccat_claimed = 1;
  		}
  	} else {
  		hid_set_drvdata(hdev, NULL);
  	}
  
  	return 0;
  exit_free:
  	kfree(koneplus);
  	return retval;
  }
  
  static void koneplus_remove_specials(struct hid_device *hdev)
  {
  	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  	struct koneplus_device *koneplus;
  
  	if (intf->cur_altsetting->desc.bInterfaceProtocol
  			== USB_INTERFACE_PROTOCOL_MOUSE) {
  		koneplus = hid_get_drvdata(hdev);
  		if (koneplus->roccat_claimed)
  			roccat_disconnect(koneplus->chrdev_minor);
  		kfree(koneplus);
  	}
  }
  
  static int koneplus_probe(struct hid_device *hdev,
  		const struct hid_device_id *id)
  {
  	int retval;
  
  	retval = hid_parse(hdev);
  	if (retval) {
  		hid_err(hdev, "parse failed
  ");
  		goto exit;
  	}
  
  	retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  	if (retval) {
  		hid_err(hdev, "hw start failed
  ");
  		goto exit;
  	}
  
  	retval = koneplus_init_specials(hdev);
  	if (retval) {
  		hid_err(hdev, "couldn't install mouse
  ");
  		goto exit_stop;
  	}
  
  	return 0;
  
  exit_stop:
  	hid_hw_stop(hdev);
  exit:
  	return retval;
  }
  
  static void koneplus_remove(struct hid_device *hdev)
  {
  	koneplus_remove_specials(hdev);
  	hid_hw_stop(hdev);
  }
  
  static void koneplus_keep_values_up_to_date(struct koneplus_device *koneplus,
  		u8 const *data)
  {
  	struct koneplus_mouse_report_button const *button_report;
  
  	switch (data[0]) {
  	case KONEPLUS_MOUSE_REPORT_NUMBER_BUTTON:
  		button_report = (struct koneplus_mouse_report_button const *)data;
  		switch (button_report->type) {
  		case KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_PROFILE:
  			koneplus_profile_activated(koneplus, button_report->data1 - 1);
  			break;
  		}
  		break;
  	}
  }
  
  static void koneplus_report_to_chrdev(struct koneplus_device const *koneplus,
  		u8 const *data)
  {
  	struct koneplus_roccat_report roccat_report;
  	struct koneplus_mouse_report_button const *button_report;
  
  	if (data[0] != KONEPLUS_MOUSE_REPORT_NUMBER_BUTTON)
  		return;
  
  	button_report = (struct koneplus_mouse_report_button const *)data;
  
  	if ((button_report->type == KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_QUICKLAUNCH ||
  			button_report->type == KONEPLUS_MOUSE_REPORT_BUTTON_TYPE_TIMER) &&
  			button_report->data2 != KONEPLUS_MOUSE_REPORT_BUTTON_ACTION_PRESS)
  		return;
  
  	roccat_report.type = button_report->type;
  	roccat_report.data1 = button_report->data1;
  	roccat_report.data2 = button_report->data2;
  	roccat_report.profile = koneplus->actual_profile + 1;
  	roccat_report_event(koneplus->chrdev_minor,
  			(uint8_t const *)&roccat_report);
  }
  
  static int koneplus_raw_event(struct hid_device *hdev,
  		struct hid_report *report, u8 *data, int size)
  {
  	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  	struct koneplus_device *koneplus = hid_get_drvdata(hdev);
  
  	if (intf->cur_altsetting->desc.bInterfaceProtocol
  			!= USB_INTERFACE_PROTOCOL_MOUSE)
  		return 0;
  
  	if (koneplus == NULL)
  		return 0;
  
  	koneplus_keep_values_up_to_date(koneplus, data);
  
  	if (koneplus->roccat_claimed)
  		koneplus_report_to_chrdev(koneplus, data);
  
  	return 0;
  }
  
  static const struct hid_device_id koneplus_devices[] = {
  	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_KONEPLUS) },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_KONEXTD) },
  	{ }
  };
  
  MODULE_DEVICE_TABLE(hid, koneplus_devices);
  
  static struct hid_driver koneplus_driver = {
  		.name = "koneplus",
  		.id_table = koneplus_devices,
  		.probe = koneplus_probe,
  		.remove = koneplus_remove,
  		.raw_event = koneplus_raw_event
  };
  
  static int __init koneplus_init(void)
  {
  	int retval;
  
  	/* class name has to be same as driver name */
  	koneplus_class = class_create(THIS_MODULE, "koneplus");
  	if (IS_ERR(koneplus_class))
  		return PTR_ERR(koneplus_class);
  	koneplus_class->dev_groups = koneplus_groups;
  
  	retval = hid_register_driver(&koneplus_driver);
  	if (retval)
  		class_destroy(koneplus_class);
  	return retval;
  }
  
  static void __exit koneplus_exit(void)
  {
  	hid_unregister_driver(&koneplus_driver);
  	class_destroy(koneplus_class);
  }
  
  module_init(koneplus_init);
  module_exit(koneplus_exit);
  
  MODULE_AUTHOR("Stefan Achatz");
  MODULE_DESCRIPTION("USB Roccat Kone[+]/XTD driver");
  MODULE_LICENSE("GPL v2");