drivers/hid/hid-lenovo-tpkbd.c - maze/linux - Git at Google

 /*
  *  HID driver for Lenovo ThinkPad USB Keyboard with TrackPoint
  *
  *  Copyright (c) 2012 Bernhard Seibold
  */

 /*
  * 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.
  */

 #include <linux/module.h>
 #include <linux/sysfs.h>
 #include <linux/device.h>
 #include <linux/usb.h>
 #include <linux/hid.h>
 #include <linux/input.h>
 #include <linux/leds.h>
 #include "usbhid/usbhid.h"

 #include "hid-ids.h"

 /* This is only used for the trackpoint part of the driver, hence _tp */
 struct tpkbd_data_pointer {
 	int led_state;
 	struct led_classdev led_mute;
 	struct led_classdev led_micmute;
 	int press_to_select;
 	int dragging;
 	int release_to_select;
 	int select_right;
 	int sensitivity;
 	int press_speed;
 };

 #define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))

 static int tpkbd_input_mapping(struct hid_device *hdev,
 		struct hid_input *hi, struct hid_field *field,
 		struct hid_usage *usage, unsigned long **bit, int *max)
 {
 	struct usbhid_device *uhdev;

 	uhdev = (struct usbhid_device *) hdev->driver_data;
 	if (uhdev->ifnum == 1 && usage->hid == (HID_UP_BUTTON | 0x0010)) {
 		map_key_clear(KEY_MICMUTE);
 		return 1;
 	}
 	return 0;
 }

 #undef map_key_clear

 static int tpkbd_features_set(struct hid_device *hdev)
 {
 	struct hid_report *report;
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[4];

 	report->field[0]->value[0]  = data_pointer->press_to_select   ? 0x01 : 0x02;
 	report->field[0]->value[0] |= data_pointer->dragging          ? 0x04 : 0x08;
 	report->field[0]->value[0] |= data_pointer->release_to_select ? 0x10 : 0x20;
 	report->field[0]->value[0] |= data_pointer->select_right      ? 0x80 : 0x40;
 	report->field[1]->value[0] = 0x03; // unknown setting, imitate windows driver
 	report->field[2]->value[0] = data_pointer->sensitivity;
 	report->field[3]->value[0] = data_pointer->press_speed;

 	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
 	return 0;
 }

 static ssize_t pointer_press_to_select_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->press_to_select);
 }

 static ssize_t pointer_press_to_select_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t count)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	int value;

 	if (kstrtoint(buf, 10, &value))
 		return -EINVAL;
 	if (value < 0 || value > 1)
 		return -EINVAL;

 	data_pointer->press_to_select = value;
 	tpkbd_features_set(hdev);

 	return count;
 }

 static ssize_t pointer_dragging_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->dragging);
 }

 static ssize_t pointer_dragging_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t count)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	int value;

 	if (kstrtoint(buf, 10, &value))
 		return -EINVAL;
 	if (value < 0 || value > 1)
 		return -EINVAL;

 	data_pointer->dragging = value;
 	tpkbd_features_set(hdev);

 	return count;
 }

 static ssize_t pointer_release_to_select_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->release_to_select);
 }

 static ssize_t pointer_release_to_select_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t count)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	int value;

 	if (kstrtoint(buf, 10, &value))
 		return -EINVAL;
 	if (value < 0 || value > 1)
 		return -EINVAL;

 	data_pointer->release_to_select = value;
 	tpkbd_features_set(hdev);

 	return count;
 }

 static ssize_t pointer_select_right_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->select_right);
 }

 static ssize_t pointer_select_right_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t count)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	int value;

 	if (kstrtoint(buf, 10, &value))
 		return -EINVAL;
 	if (value < 0 || value > 1)
 		return -EINVAL;

 	data_pointer->select_right = value;
 	tpkbd_features_set(hdev);

 	return count;
 }

 static ssize_t pointer_sensitivity_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	return snprintf(buf, PAGE_SIZE, "%u\n",
 		data_pointer->sensitivity);
 }

 static ssize_t pointer_sensitivity_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t count)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	int value;

 	if (kstrtoint(buf, 10, &value) || value < 1 || value > 255)
 		return -EINVAL;

 	data_pointer->sensitivity = value;
 	tpkbd_features_set(hdev);

 	return count;
 }

 static ssize_t pointer_press_speed_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	return snprintf(buf, PAGE_SIZE, "%u\n",
 		data_pointer->press_speed);
 }

 static ssize_t pointer_press_speed_store(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
 		size_t count)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	int value;

 	if (kstrtoint(buf, 10, &value) || value < 1 || value > 255)
 		return -EINVAL;

 	data_pointer->press_speed = value;
 	tpkbd_features_set(hdev);

 	return count;
 }

 static struct device_attribute dev_attr_pointer_press_to_select =
 	__ATTR(press_to_select, S_IWUSR | S_IRUGO,
 			pointer_press_to_select_show,
 			pointer_press_to_select_store);

 static struct device_attribute dev_attr_pointer_dragging =
 	__ATTR(dragging, S_IWUSR | S_IRUGO,
 			pointer_dragging_show,
 			pointer_dragging_store);

 static struct device_attribute dev_attr_pointer_release_to_select =
 	__ATTR(release_to_select, S_IWUSR | S_IRUGO,
 			pointer_release_to_select_show,
 			pointer_release_to_select_store);

 static struct device_attribute dev_attr_pointer_select_right =
 	__ATTR(select_right, S_IWUSR | S_IRUGO,
 			pointer_select_right_show,
 			pointer_select_right_store);

 static struct device_attribute dev_attr_pointer_sensitivity =
 	__ATTR(sensitivity, S_IWUSR | S_IRUGO,
 			pointer_sensitivity_show,
 			pointer_sensitivity_store);

 static struct device_attribute dev_attr_pointer_press_speed =
 	__ATTR(press_speed, S_IWUSR | S_IRUGO,
 			pointer_press_speed_show,
 			pointer_press_speed_store);

 static struct attribute *tpkbd_attributes_pointer[] = {
 	&dev_attr_pointer_press_to_select.attr,
 	&dev_attr_pointer_dragging.attr,
 	&dev_attr_pointer_release_to_select.attr,
 	&dev_attr_pointer_select_right.attr,
 	&dev_attr_pointer_sensitivity.attr,
 	&dev_attr_pointer_press_speed.attr,
 	NULL
 };

 static const struct attribute_group tpkbd_attr_group_pointer = {
 	.attrs = tpkbd_attributes_pointer,
 };

 static enum led_brightness tpkbd_led_brightness_get(
 			struct led_classdev *led_cdev)
 {
 	struct device *dev = led_cdev->dev->parent;
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	int led_nr = 0;

 	if (led_cdev == &data_pointer->led_micmute)
 		led_nr = 1;

 	return data_pointer->led_state & (1 << led_nr)
 				? LED_FULL
 				: LED_OFF;
 }

 static void tpkbd_led_brightness_set(struct led_classdev *led_cdev,
 			enum led_brightness value)
 {
 	struct device *dev = led_cdev->dev->parent;
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
 	struct hid_report *report;
 	int led_nr = 0;

 	if (led_cdev == &data_pointer->led_micmute)
 		led_nr = 1;

 	if (value == LED_OFF)
 		data_pointer->led_state &= ~(1 << led_nr);
 	else
 		data_pointer->led_state |= 1 << led_nr;

 	report = hdev->report_enum[HID_OUTPUT_REPORT].report_id_hash[3];
 	report->field[0]->value[0] = (data_pointer->led_state >> 0) & 1;
 	report->field[0]->value[1] = (data_pointer->led_state >> 1) & 1;
 	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
 }

 static int tpkbd_probe_tp(struct hid_device *hdev)
 {
 	struct device *dev = &hdev->dev;
 	struct tpkbd_data_pointer *data_pointer;
 	size_t name_sz = strlen(dev_name(dev)) + 16;
 	char *name_mute, *name_micmute;
 	int ret;

 	if (sysfs_create_group(&hdev->dev.kobj,
 				&tpkbd_attr_group_pointer)) {
 		hid_warn(hdev, "Could not create sysfs group\n");
 	}

 	data_pointer = kzalloc(sizeof(struct tpkbd_data_pointer), GFP_KERNEL);
 	if (data_pointer == NULL) {
 		hid_err(hdev, "Could not allocate memory for driver data\n");
 		return -ENOMEM;
 	}

 	// set same default values as windows driver
 	data_pointer->sensitivity = 0xa0;
 	data_pointer->press_speed = 0x38;

 	name_mute = kzalloc(name_sz, GFP_KERNEL);
 	if (name_mute == NULL) {
 		hid_err(hdev, "Could not allocate memory for led data\n");
 		ret = -ENOMEM;
 		goto err;
 	}
 	snprintf(name_mute, name_sz, "%s:amber:mute", dev_name(dev));

 	name_micmute = kzalloc(name_sz, GFP_KERNEL);
 	if (name_micmute == NULL) {
 		hid_err(hdev, "Could not allocate memory for led data\n");
 		ret = -ENOMEM;
 		goto err2;
 	}
 	snprintf(name_micmute, name_sz, "%s:amber:micmute", dev_name(dev));

 	hid_set_drvdata(hdev, data_pointer);

 	data_pointer->led_mute.name = name_mute;
 	data_pointer->led_mute.brightness_get = tpkbd_led_brightness_get;
 	data_pointer->led_mute.brightness_set = tpkbd_led_brightness_set;
 	data_pointer->led_mute.dev = dev;
 	led_classdev_register(dev, &data_pointer->led_mute);

 	data_pointer->led_micmute.name = name_micmute;
 	data_pointer->led_micmute.brightness_get = tpkbd_led_brightness_get;
 	data_pointer->led_micmute.brightness_set = tpkbd_led_brightness_set;
 	data_pointer->led_micmute.dev = dev;
 	led_classdev_register(dev, &data_pointer->led_micmute);

 	tpkbd_features_set(hdev);

 	return 0;

 err2:
 	kfree(name_mute);
 err:
 	kfree(data_pointer);
 	return ret;
 }

 static int tpkbd_probe(struct hid_device *hdev,
 		const struct hid_device_id *id)
 {
 	int ret;
 	struct usbhid_device *uhdev;

 	ret = hid_parse(hdev);
 	if (ret) {
 		hid_err(hdev, "hid_parse failed\n");
 		goto err_free;
 	}

 	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 	if (ret) {
 		hid_err(hdev, "hid_hw_start failed\n");
 		goto err_free;
 	}

 	uhdev = (struct usbhid_device *) hdev->driver_data;

 	if (uhdev->ifnum == 1)
 		return tpkbd_probe_tp(hdev);

 	return 0;
 err_free:
 	return ret;
 }

 static void tpkbd_remove_tp(struct hid_device *hdev)
 {
 	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

 	sysfs_remove_group(&hdev->dev.kobj,
 			&tpkbd_attr_group_pointer);

 	led_classdev_unregister(&data_pointer->led_micmute);
 	led_classdev_unregister(&data_pointer->led_mute);

 	hid_set_drvdata(hdev, NULL);
 	kfree(data_pointer->led_micmute.name);
 	kfree(data_pointer->led_mute.name);
 	kfree(data_pointer);
 }

 static void tpkbd_remove(struct hid_device *hdev)
 {
 	struct usbhid_device *uhdev;

 	uhdev = (struct usbhid_device *) hdev->driver_data;
 	if (uhdev->ifnum == 1)
 		tpkbd_remove_tp(hdev);

 	hid_hw_stop(hdev);
 }

 static const struct hid_device_id tpkbd_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_TPKBD) },
 	{ }
 };

 MODULE_DEVICE_TABLE(hid, tpkbd_devices);

 static struct hid_driver tpkbd_driver = {
 	.name = "lenovo_tpkbd",
 	.id_table = tpkbd_devices,
 	.input_mapping = tpkbd_input_mapping,
 	.probe = tpkbd_probe,
 	.remove = tpkbd_remove,
 };
 module_hid_driver(tpkbd_driver);

 MODULE_LICENSE("GPL");
	/*
	* HID driver for Lenovo ThinkPad USB Keyboard with TrackPoint
	*
	* Copyright (c) 2012 Bernhard Seibold
	*/

	/*
	* 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.
	*/

	#include <linux/module.h>
	#include <linux/sysfs.h>
	#include <linux/device.h>
	#include <linux/usb.h>
	#include <linux/hid.h>
	#include <linux/input.h>
	#include <linux/leds.h>
	#include "usbhid/usbhid.h"

	#include "hid-ids.h"

	/* This is only used for the trackpoint part of the driver, hence _tp */
	struct tpkbd_data_pointer {
	int led_state;
	struct led_classdev led_mute;
	struct led_classdev led_micmute;
	int press_to_select;
	int dragging;
	int release_to_select;
	int select_right;
	int sensitivity;
	int press_speed;
	};

	#define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))

	static int tpkbd_input_mapping(struct hid_device *hdev,
	struct hid_input hi, struct hid_field field,
	struct hid_usage usage, unsigned long bit, int max)
	{
	struct usbhid_device *uhdev;

	uhdev = (struct usbhid_device *) hdev->driver_data;
	if (uhdev->ifnum == 1 && usage->hid == (HID_UP_BUTTON \| 0x0010)) {
	map_key_clear(KEY_MICMUTE);
	return 1;
	}
	return 0;
	}

	#undef map_key_clear

	static int tpkbd_features_set(struct hid_device *hdev)
	{
	struct hid_report *report;
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[4];

	report->field[0]->value[0] = data_pointer->press_to_select ? 0x01 : 0x02;
	report->field[0]->value[0] \|= data_pointer->dragging ? 0x04 : 0x08;
	report->field[0]->value[0] \|= data_pointer->release_to_select ? 0x10 : 0x20;
	report->field[0]->value[0] \|= data_pointer->select_right ? 0x80 : 0x40;
	report->field[1]->value[0] = 0x03; // unknown setting, imitate windows driver
	report->field[2]->value[0] = data_pointer->sensitivity;
	report->field[3]->value[0] = data_pointer->press_speed;

	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
	return 0;
	}

	static ssize_t pointer_press_to_select_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->press_to_select);
	}

	static ssize_t pointer_press_to_select_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
	return -EINVAL;
	if (value < 0 \|\| value > 1)
	return -EINVAL;

	data_pointer->press_to_select = value;
	tpkbd_features_set(hdev);

	return count;
	}

	static ssize_t pointer_dragging_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->dragging);
	}

	static ssize_t pointer_dragging_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
	return -EINVAL;
	if (value < 0 \|\| value > 1)
	return -EINVAL;

	data_pointer->dragging = value;
	tpkbd_features_set(hdev);

	return count;
	}

	static ssize_t pointer_release_to_select_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->release_to_select);
	}

	static ssize_t pointer_release_to_select_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
	return -EINVAL;
	if (value < 0 \|\| value > 1)
	return -EINVAL;

	data_pointer->release_to_select = value;
	tpkbd_features_set(hdev);

	return count;
	}

	static ssize_t pointer_select_right_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->select_right);
	}

	static ssize_t pointer_select_right_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
	return -EINVAL;
	if (value < 0 \|\| value > 1)
	return -EINVAL;

	data_pointer->select_right = value;
	tpkbd_features_set(hdev);

	return count;
	}

	static ssize_t pointer_sensitivity_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n",
	data_pointer->sensitivity);
	}

	static ssize_t pointer_sensitivity_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value) \|\| value < 1 \|\| value > 255)
	return -EINVAL;

	data_pointer->sensitivity = value;
	tpkbd_features_set(hdev);

	return count;
	}

	static ssize_t pointer_press_speed_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n",
	data_pointer->press_speed);
	}

	static ssize_t pointer_press_speed_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value) \|\| value < 1 \|\| value > 255)
	return -EINVAL;

	data_pointer->press_speed = value;
	tpkbd_features_set(hdev);

	return count;
	}

	static struct device_attribute dev_attr_pointer_press_to_select =
	__ATTR(press_to_select, S_IWUSR \| S_IRUGO,
	pointer_press_to_select_show,
	pointer_press_to_select_store);

	static struct device_attribute dev_attr_pointer_dragging =
	__ATTR(dragging, S_IWUSR \| S_IRUGO,
	pointer_dragging_show,
	pointer_dragging_store);

	static struct device_attribute dev_attr_pointer_release_to_select =
	__ATTR(release_to_select, S_IWUSR \| S_IRUGO,
	pointer_release_to_select_show,
	pointer_release_to_select_store);

	static struct device_attribute dev_attr_pointer_select_right =
	__ATTR(select_right, S_IWUSR \| S_IRUGO,
	pointer_select_right_show,
	pointer_select_right_store);

	static struct device_attribute dev_attr_pointer_sensitivity =
	__ATTR(sensitivity, S_IWUSR \| S_IRUGO,
	pointer_sensitivity_show,
	pointer_sensitivity_store);

	static struct device_attribute dev_attr_pointer_press_speed =
	__ATTR(press_speed, S_IWUSR \| S_IRUGO,
	pointer_press_speed_show,
	pointer_press_speed_store);

	static struct attribute *tpkbd_attributes_pointer[] = {
	&dev_attr_pointer_press_to_select.attr,
	&dev_attr_pointer_dragging.attr,
	&dev_attr_pointer_release_to_select.attr,
	&dev_attr_pointer_select_right.attr,
	&dev_attr_pointer_sensitivity.attr,
	&dev_attr_pointer_press_speed.attr,
	NULL
	};

	static const struct attribute_group tpkbd_attr_group_pointer = {
	.attrs = tpkbd_attributes_pointer,
	};

	static enum led_brightness tpkbd_led_brightness_get(
	struct led_classdev *led_cdev)
	{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int led_nr = 0;

	if (led_cdev == &data_pointer->led_micmute)
	led_nr = 1;

	return data_pointer->led_state & (1 << led_nr)
	? LED_FULL
	: LED_OFF;
	}

	static void tpkbd_led_brightness_set(struct led_classdev *led_cdev,
	enum led_brightness value)
	{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	struct hid_report *report;
	int led_nr = 0;

	if (led_cdev == &data_pointer->led_micmute)
	led_nr = 1;

	if (value == LED_OFF)
	data_pointer->led_state &= ~(1 << led_nr);
	else
	data_pointer->led_state \|= 1 << led_nr;

	report = hdev->report_enum[HID_OUTPUT_REPORT].report_id_hash[3];
	report->field[0]->value[0] = (data_pointer->led_state >> 0) & 1;
	report->field[0]->value[1] = (data_pointer->led_state >> 1) & 1;
	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
	}

	static int tpkbd_probe_tp(struct hid_device *hdev)
	{
	struct device *dev = &hdev->dev;
	struct tpkbd_data_pointer *data_pointer;
	size_t name_sz = strlen(dev_name(dev)) + 16;
	char name_mute, name_micmute;
	int ret;

	if (sysfs_create_group(&hdev->dev.kobj,
	&tpkbd_attr_group_pointer)) {
	hid_warn(hdev, "Could not create sysfs group\n");
	}

	data_pointer = kzalloc(sizeof(struct tpkbd_data_pointer), GFP_KERNEL);
	if (data_pointer == NULL) {
	hid_err(hdev, "Could not allocate memory for driver data\n");
	return -ENOMEM;
	}

	// set same default values as windows driver
	data_pointer->sensitivity = 0xa0;
	data_pointer->press_speed = 0x38;

	name_mute = kzalloc(name_sz, GFP_KERNEL);
	if (name_mute == NULL) {
	hid_err(hdev, "Could not allocate memory for led data\n");
	ret = -ENOMEM;
	goto err;
	}
	snprintf(name_mute, name_sz, "%s:amber:mute", dev_name(dev));

	name_micmute = kzalloc(name_sz, GFP_KERNEL);
	if (name_micmute == NULL) {
	hid_err(hdev, "Could not allocate memory for led data\n");
	ret = -ENOMEM;
	goto err2;
	}
	snprintf(name_micmute, name_sz, "%s:amber:micmute", dev_name(dev));

	hid_set_drvdata(hdev, data_pointer);

	data_pointer->led_mute.name = name_mute;
	data_pointer->led_mute.brightness_get = tpkbd_led_brightness_get;
	data_pointer->led_mute.brightness_set = tpkbd_led_brightness_set;
	data_pointer->led_mute.dev = dev;
	led_classdev_register(dev, &data_pointer->led_mute);

	data_pointer->led_micmute.name = name_micmute;
	data_pointer->led_micmute.brightness_get = tpkbd_led_brightness_get;
	data_pointer->led_micmute.brightness_set = tpkbd_led_brightness_set;
	data_pointer->led_micmute.dev = dev;
	led_classdev_register(dev, &data_pointer->led_micmute);

	tpkbd_features_set(hdev);

	return 0;

	err2:
	kfree(name_mute);
	err:
	kfree(data_pointer);
	return ret;
	}

	static int tpkbd_probe(struct hid_device *hdev,
	const struct hid_device_id *id)
	{
	int ret;
	struct usbhid_device *uhdev;

	ret = hid_parse(hdev);
	if (ret) {
	hid_err(hdev, "hid_parse failed\n");
	goto err_free;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (ret) {
	hid_err(hdev, "hid_hw_start failed\n");
	goto err_free;
	}

	uhdev = (struct usbhid_device *) hdev->driver_data;

	if (uhdev->ifnum == 1)
	return tpkbd_probe_tp(hdev);

	return 0;
	err_free:
	return ret;
	}

	static void tpkbd_remove_tp(struct hid_device *hdev)
	{
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	sysfs_remove_group(&hdev->dev.kobj,
	&tpkbd_attr_group_pointer);

	led_classdev_unregister(&data_pointer->led_micmute);
	led_classdev_unregister(&data_pointer->led_mute);

	hid_set_drvdata(hdev, NULL);
	kfree(data_pointer->led_micmute.name);
	kfree(data_pointer->led_mute.name);
	kfree(data_pointer);
	}

	static void tpkbd_remove(struct hid_device *hdev)
	{
	struct usbhid_device *uhdev;

	uhdev = (struct usbhid_device *) hdev->driver_data;
	if (uhdev->ifnum == 1)
	tpkbd_remove_tp(hdev);

	hid_hw_stop(hdev);
	}

	static const struct hid_device_id tpkbd_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_TPKBD) },
	{ }
	};

	MODULE_DEVICE_TABLE(hid, tpkbd_devices);

	static struct hid_driver tpkbd_driver = {
	.name = "lenovo_tpkbd",
	.id_table = tpkbd_devices,
	.input_mapping = tpkbd_input_mapping,
	.probe = tpkbd_probe,
	.remove = tpkbd_remove,
	};
	module_hid_driver(tpkbd_driver);

	MODULE_LICENSE("GPL");