drivers/hid/hid-lenovo.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  *  HID driver for Lenovo:
  *  - ThinkPad USB Keyboard with TrackPoint (tpkbd)
  *
  *  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/hid.h>
 #include <linux/input.h>
 #include <linux/leds.h>

 #include "hid-ids.h"

 struct lenovo_drvdata_tpkbd {
 	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 lenovo_input_mapping_tpkbd(struct hid_device *hdev,
 		struct hid_input *hi, struct hid_field *field,
 		struct hid_usage *usage, unsigned long **bit, int *max)
 {
 	if (usage->hid == (HID_UP_BUTTON | 0x0010)) {
 		/* This sub-device contains trackpoint, mark it */
 		hid_set_drvdata(hdev, (void *)1);
 		map_key_clear(KEY_MICMUTE);
 		return 1;
 	}
 	return 0;
 }

 static int lenovo_input_mapping(struct hid_device *hdev,
 		struct hid_input *hi, struct hid_field *field,
 		struct hid_usage *usage, unsigned long **bit, int *max)
 {
 	switch (hdev->product) {
 	case USB_DEVICE_ID_LENOVO_TPKBD:
 		return lenovo_input_mapping_tpkbd(hdev, hi, field,
 							usage, bit, max);
 	default:
 		return 0;
 	}
 }

 #undef map_key_clear

 static int lenovo_features_set_tpkbd(struct hid_device *hdev)
 {
 	struct hid_report *report;
 	struct lenovo_drvdata_tpkbd *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 attr_press_to_select_show_tpkbd(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);

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

 static ssize_t attr_press_to_select_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
 	lenovo_features_set_tpkbd(hdev);

 	return count;
 }

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

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

 static ssize_t attr_dragging_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
 	lenovo_features_set_tpkbd(hdev);

 	return count;
 }

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

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

 static ssize_t attr_release_to_select_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
 	lenovo_features_set_tpkbd(hdev);

 	return count;
 }

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

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

 static ssize_t attr_select_right_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
 	lenovo_features_set_tpkbd(hdev);

 	return count;
 }

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

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

 static ssize_t attr_sensitivity_store_tpkbd(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 lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);
 	int value;

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

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

 	return count;
 }

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

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

 static ssize_t attr_press_speed_store_tpkbd(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 lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);
 	int value;

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

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

 	return count;
 }

 static struct device_attribute dev_attr_press_to_select_tpkbd =
 	__ATTR(press_to_select, S_IWUSR | S_IRUGO,
 			attr_press_to_select_show_tpkbd,
 			attr_press_to_select_store_tpkbd);

 static struct device_attribute dev_attr_dragging_tpkbd =
 	__ATTR(dragging, S_IWUSR | S_IRUGO,
 			attr_dragging_show_tpkbd,
 			attr_dragging_store_tpkbd);

 static struct device_attribute dev_attr_release_to_select_tpkbd =
 	__ATTR(release_to_select, S_IWUSR | S_IRUGO,
 			attr_release_to_select_show_tpkbd,
 			attr_release_to_select_store_tpkbd);

 static struct device_attribute dev_attr_select_right_tpkbd =
 	__ATTR(select_right, S_IWUSR | S_IRUGO,
 			attr_select_right_show_tpkbd,
 			attr_select_right_store_tpkbd);

 static struct device_attribute dev_attr_sensitivity_tpkbd =
 	__ATTR(sensitivity, S_IWUSR | S_IRUGO,
 			attr_sensitivity_show_tpkbd,
 			attr_sensitivity_store_tpkbd);

 static struct device_attribute dev_attr_press_speed_tpkbd =
 	__ATTR(press_speed, S_IWUSR | S_IRUGO,
 			attr_press_speed_show_tpkbd,
 			attr_press_speed_store_tpkbd);

 static struct attribute *lenovo_attributes_tpkbd[] = {
 	&dev_attr_press_to_select_tpkbd.attr,
 	&dev_attr_dragging_tpkbd.attr,
 	&dev_attr_release_to_select_tpkbd.attr,
 	&dev_attr_select_right_tpkbd.attr,
 	&dev_attr_sensitivity_tpkbd.attr,
 	&dev_attr_press_speed_tpkbd.attr,
 	NULL
 };

 static const struct attribute_group lenovo_attr_group_tpkbd = {
 	.attrs = lenovo_attributes_tpkbd,
 };

 static enum led_brightness lenovo_led_brightness_get_tpkbd(
 			struct led_classdev *led_cdev)
 {
 	struct device *dev = led_cdev->dev->parent;
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 	struct lenovo_drvdata_tpkbd *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 lenovo_led_brightness_set_tpkbd(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 lenovo_drvdata_tpkbd *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 lenovo_probe_tpkbd(struct hid_device *hdev)
 {
 	struct device *dev = &hdev->dev;
 	struct lenovo_drvdata_tpkbd *data_pointer;
 	size_t name_sz = strlen(dev_name(dev)) + 16;
 	char *name_mute, *name_micmute;
 	int i;
 	int ret;

 	/*
 	 * Only register extra settings against subdevice where input_mapping
 	 * set drvdata to 1, i.e. the trackpoint.
 	 */
 	if (!hid_get_drvdata(hdev))
 		return 0;

 	hid_set_drvdata(hdev, NULL);

 	/* Validate required reports. */
 	for (i = 0; i < 4; i++) {
 		if (!hid_validate_values(hdev, HID_FEATURE_REPORT, 4, i, 1))
 			return -ENODEV;
 	}
 	if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, 3, 0, 2))
 		return -ENODEV;

 	ret = sysfs_create_group(&hdev->dev.kobj, &lenovo_attr_group_tpkbd);
 	if (ret)
 		hid_warn(hdev, "Could not create sysfs group: %d\n", ret);

 	data_pointer = devm_kzalloc(&hdev->dev,
 				    sizeof(struct lenovo_drvdata_tpkbd),
 				    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 = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
 	name_micmute = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
 	if (name_mute == NULL || name_micmute == NULL) {
 		hid_err(hdev, "Could not allocate memory for led data\n");
 		return -ENOMEM;
 	}
 	snprintf(name_mute, name_sz, "%s:amber:mute", dev_name(dev));
 	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 = lenovo_led_brightness_get_tpkbd;
 	data_pointer->led_mute.brightness_set = lenovo_led_brightness_set_tpkbd;
 	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 =
 		lenovo_led_brightness_get_tpkbd;
 	data_pointer->led_micmute.brightness_set =
 		lenovo_led_brightness_set_tpkbd;
 	data_pointer->led_micmute.dev = dev;
 	led_classdev_register(dev, &data_pointer->led_micmute);

 	lenovo_features_set_tpkbd(hdev);

 	return 0;
 }

 static int lenovo_probe(struct hid_device *hdev,
 		const struct hid_device_id *id)
 {
 	int ret;

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

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

 	switch (hdev->product) {
 	case USB_DEVICE_ID_LENOVO_TPKBD:
 		ret = lenovo_probe_tpkbd(hdev);
 		break;
 	default:
 		ret = 0;
 		break;
 	}
 	if (ret)
 		goto err_hid;

 	return 0;
 err_hid:
 	hid_hw_stop(hdev);
 err:
 	return ret;
 }

 static void lenovo_remove_tpkbd(struct hid_device *hdev)
 {
 	struct lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);

 	/*
 	 * Only the trackpoint half of the keyboard has drvdata and stuff that
 	 * needs unregistering.
 	 */
 	if (data_pointer == NULL)
 		return;

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

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

 	hid_set_drvdata(hdev, NULL);
 }

 static void lenovo_remove(struct hid_device *hdev)
 {
 	switch (hdev->product) {
 	case USB_DEVICE_ID_LENOVO_TPKBD:
 		lenovo_remove_tpkbd(hdev);
 		break;
 	}

 	hid_hw_stop(hdev);
 }

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

 MODULE_DEVICE_TABLE(hid, lenovo_devices);

 static struct hid_driver lenovo_driver = {
 	.name = "lenovo",
 	.id_table = lenovo_devices,
 	.input_mapping = lenovo_input_mapping,
 	.probe = lenovo_probe,
 	.remove = lenovo_remove,
 };
 module_hid_driver(lenovo_driver);

 MODULE_LICENSE("GPL");
	/*
	* HID driver for Lenovo:
	* - ThinkPad USB Keyboard with TrackPoint (tpkbd)
	*
	* 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/hid.h>
	#include <linux/input.h>
	#include <linux/leds.h>

	#include "hid-ids.h"

	struct lenovo_drvdata_tpkbd {
	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 lenovo_input_mapping_tpkbd(struct hid_device *hdev,
	struct hid_input hi, struct hid_field field,
	struct hid_usage usage, unsigned long bit, int max)
	{
	if (usage->hid == (HID_UP_BUTTON \| 0x0010)) {
	/* This sub-device contains trackpoint, mark it */
	hid_set_drvdata(hdev, (void *)1);
	map_key_clear(KEY_MICMUTE);
	return 1;
	}
	return 0;
	}

	static int lenovo_input_mapping(struct hid_device *hdev,
	struct hid_input hi, struct hid_field field,
	struct hid_usage usage, unsigned long bit, int max)
	{
	switch (hdev->product) {
	case USB_DEVICE_ID_LENOVO_TPKBD:
	return lenovo_input_mapping_tpkbd(hdev, hi, field,
	usage, bit, max);
	default:
	return 0;
	}
	}

	#undef map_key_clear

	static int lenovo_features_set_tpkbd(struct hid_device *hdev)
	{
	struct hid_report *report;
	struct lenovo_drvdata_tpkbd *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 attr_press_to_select_show_tpkbd(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);

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

	static ssize_t attr_press_to_select_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
	lenovo_features_set_tpkbd(hdev);

	return count;
	}

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

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

	static ssize_t attr_dragging_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
	lenovo_features_set_tpkbd(hdev);

	return count;
	}

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

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

	static ssize_t attr_release_to_select_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
	lenovo_features_set_tpkbd(hdev);

	return count;
	}

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

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

	static ssize_t attr_select_right_store_tpkbd(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 lenovo_drvdata_tpkbd *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;
	lenovo_features_set_tpkbd(hdev);

	return count;
	}

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

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

	static ssize_t attr_sensitivity_store_tpkbd(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 lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);
	int value;

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

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

	return count;
	}

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

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

	static ssize_t attr_press_speed_store_tpkbd(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 lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);
	int value;

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

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

	return count;
	}

	static struct device_attribute dev_attr_press_to_select_tpkbd =
	__ATTR(press_to_select, S_IWUSR \| S_IRUGO,
	attr_press_to_select_show_tpkbd,
	attr_press_to_select_store_tpkbd);

	static struct device_attribute dev_attr_dragging_tpkbd =
	__ATTR(dragging, S_IWUSR \| S_IRUGO,
	attr_dragging_show_tpkbd,
	attr_dragging_store_tpkbd);

	static struct device_attribute dev_attr_release_to_select_tpkbd =
	__ATTR(release_to_select, S_IWUSR \| S_IRUGO,
	attr_release_to_select_show_tpkbd,
	attr_release_to_select_store_tpkbd);

	static struct device_attribute dev_attr_select_right_tpkbd =
	__ATTR(select_right, S_IWUSR \| S_IRUGO,
	attr_select_right_show_tpkbd,
	attr_select_right_store_tpkbd);

	static struct device_attribute dev_attr_sensitivity_tpkbd =
	__ATTR(sensitivity, S_IWUSR \| S_IRUGO,
	attr_sensitivity_show_tpkbd,
	attr_sensitivity_store_tpkbd);

	static struct device_attribute dev_attr_press_speed_tpkbd =
	__ATTR(press_speed, S_IWUSR \| S_IRUGO,
	attr_press_speed_show_tpkbd,
	attr_press_speed_store_tpkbd);

	static struct attribute *lenovo_attributes_tpkbd[] = {
	&dev_attr_press_to_select_tpkbd.attr,
	&dev_attr_dragging_tpkbd.attr,
	&dev_attr_release_to_select_tpkbd.attr,
	&dev_attr_select_right_tpkbd.attr,
	&dev_attr_sensitivity_tpkbd.attr,
	&dev_attr_press_speed_tpkbd.attr,
	NULL
	};

	static const struct attribute_group lenovo_attr_group_tpkbd = {
	.attrs = lenovo_attributes_tpkbd,
	};

	static enum led_brightness lenovo_led_brightness_get_tpkbd(
	struct led_classdev *led_cdev)
	{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct lenovo_drvdata_tpkbd *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 lenovo_led_brightness_set_tpkbd(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 lenovo_drvdata_tpkbd *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 lenovo_probe_tpkbd(struct hid_device *hdev)
	{
	struct device *dev = &hdev->dev;
	struct lenovo_drvdata_tpkbd *data_pointer;
	size_t name_sz = strlen(dev_name(dev)) + 16;
	char name_mute, name_micmute;
	int i;
	int ret;

	/*
	* Only register extra settings against subdevice where input_mapping
	* set drvdata to 1, i.e. the trackpoint.
	*/
	if (!hid_get_drvdata(hdev))
	return 0;

	hid_set_drvdata(hdev, NULL);

	/* Validate required reports. */
	for (i = 0; i < 4; i++) {
	if (!hid_validate_values(hdev, HID_FEATURE_REPORT, 4, i, 1))
	return -ENODEV;
	}
	if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, 3, 0, 2))
	return -ENODEV;

	ret = sysfs_create_group(&hdev->dev.kobj, &lenovo_attr_group_tpkbd);
	if (ret)
	hid_warn(hdev, "Could not create sysfs group: %d\n", ret);

	data_pointer = devm_kzalloc(&hdev->dev,
	sizeof(struct lenovo_drvdata_tpkbd),
	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 = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
	name_micmute = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
	if (name_mute == NULL \|\| name_micmute == NULL) {
	hid_err(hdev, "Could not allocate memory for led data\n");
	return -ENOMEM;
	}
	snprintf(name_mute, name_sz, "%s:amber:mute", dev_name(dev));
	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 = lenovo_led_brightness_get_tpkbd;
	data_pointer->led_mute.brightness_set = lenovo_led_brightness_set_tpkbd;
	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 =
	lenovo_led_brightness_get_tpkbd;
	data_pointer->led_micmute.brightness_set =
	lenovo_led_brightness_set_tpkbd;
	data_pointer->led_micmute.dev = dev;
	led_classdev_register(dev, &data_pointer->led_micmute);

	lenovo_features_set_tpkbd(hdev);

	return 0;
	}

	static int lenovo_probe(struct hid_device *hdev,
	const struct hid_device_id *id)
	{
	int ret;

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

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

	switch (hdev->product) {
	case USB_DEVICE_ID_LENOVO_TPKBD:
	ret = lenovo_probe_tpkbd(hdev);
	break;
	default:
	ret = 0;
	break;
	}
	if (ret)
	goto err_hid;

	return 0;
	err_hid:
	hid_hw_stop(hdev);
	err:
	return ret;
	}

	static void lenovo_remove_tpkbd(struct hid_device *hdev)
	{
	struct lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);

	/*
	* Only the trackpoint half of the keyboard has drvdata and stuff that
	* needs unregistering.
	*/
	if (data_pointer == NULL)
	return;

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

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

	hid_set_drvdata(hdev, NULL);
	}

	static void lenovo_remove(struct hid_device *hdev)
	{
	switch (hdev->product) {
	case USB_DEVICE_ID_LENOVO_TPKBD:
	lenovo_remove_tpkbd(hdev);
	break;
	}

	hid_hw_stop(hdev);
	}

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

	MODULE_DEVICE_TABLE(hid, lenovo_devices);

	static struct hid_driver lenovo_driver = {
	.name = "lenovo",
	.id_table = lenovo_devices,
	.input_mapping = lenovo_input_mapping,
	.probe = lenovo_probe,
	.remove = lenovo_remove,
	};
	module_hid_driver(lenovo_driver);

	MODULE_LICENSE("GPL");