drivers/hid/hid-lg4ff.c - kernel/msm-4.9 - Gitiles

 /*
  *  Force feedback support for Logitech Gaming Wheels
  *
  *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
  *  Speed Force Wireless (WiiWheel)
  *
  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
  */

 /*
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */


 #include <linux/input.h>
 #include <linux/usb.h>
 #include <linux/hid.h>

 #include "usbhid/usbhid.h"
 #include "hid-lg.h"
 #include "hid-ids.h"

 #define DFGT_REV_MAJ 0x13
 #define DFGT_REV_MIN 0x22
 #define DFGT2_REV_MIN 0x26
 #define DFP_REV_MAJ 0x11
 #define DFP_REV_MIN 0x06
 #define FFEX_REV_MAJ 0x21
 #define FFEX_REV_MIN 0x00
 #define G25_REV_MAJ 0x12
 #define G25_REV_MIN 0x22
 #define G27_REV_MAJ 0x12
 #define G27_REV_MIN 0x38

 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)

 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);

 static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);

 struct lg4ff_device_entry {
 	__u32 product_id;
 	__u16 range;
 	__u16 min_range;
 	__u16 max_range;
 #ifdef CONFIG_LEDS_CLASS
 	__u8  led_state;
 	struct led_classdev *led[5];
 #endif
 	struct list_head list;
 	void (*set_range)(struct hid_device *hid, u16 range);
 };

 static const signed short lg4ff_wheel_effects[] = {
 	FF_CONSTANT,
 	FF_AUTOCENTER,
 	-1
 };

 struct lg4ff_wheel {
 	const __u32 product_id;
 	const signed short *ff_effects;
 	const __u16 min_range;
 	const __u16 max_range;
 	void (*set_range)(struct hid_device *hid, u16 range);
 };

 static const struct lg4ff_wheel lg4ff_devices[] = {
 	{USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
 	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
 	{USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
 	{USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
 	{USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
 	{USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
 	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
 	{USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
 };

 struct lg4ff_native_cmd {
 	const __u8 cmd_num;	/* Number of commands to send */
 	const __u8 cmd[];
 };

 struct lg4ff_usb_revision {
 	const __u16 rev_maj;
 	const __u16 rev_min;
 	const struct lg4ff_native_cmd *command;
 };

 static const struct lg4ff_native_cmd native_dfp = {
 	1,
 	{0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 };

 static const struct lg4ff_native_cmd native_dfgt = {
 	2,
 	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* 1st command */
 	 0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}	/* 2nd command */
 };

 static const struct lg4ff_native_cmd native_g25 = {
 	1,
 	{0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 };

 static const struct lg4ff_native_cmd native_g27 = {
 	2,
 	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* 1st command */
 	 0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}	/* 2nd command */
 };

 static const struct lg4ff_usb_revision lg4ff_revs[] = {
 	{DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},	/* Driving Force GT */
 	{DFGT_REV_MAJ, DFGT2_REV_MIN, &native_dfgt},	/* Driving Force GT v2 */
 	{DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},	/* Driving Force Pro */
 	{G25_REV_MAJ,  G25_REV_MIN,  &native_g25},	/* G25 */
 	{G27_REV_MAJ,  G27_REV_MIN,  &native_g27},	/* G27 */
 };

 /* Recalculates X axis value accordingly to currently selected range */
 static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
 {
 	__u16 max_range;
 	__s32 new_value;

 	if (range == 900)
 		return value;
 	else if (range == 200)
 		return value;
 	else if (range < 200)
 		max_range = 200;
 	else
 		max_range = 900;

 	new_value = 8192 + mult_frac(value - 8192, max_range, range);
 	if (new_value < 0)
 		return 0;
 	else if (new_value > 16383)
 		return 16383;
 	else
 		return new_value;
 }

 int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 			     struct hid_usage *usage, __s32 value, struct lg_drv_data *drv_data)
 {
 	struct lg4ff_device_entry *entry = drv_data->device_props;
 	__s32 new_value = 0;

 	if (!entry) {
 		hid_err(hid, "Device properties not found");
 		return 0;
 	}

 	switch (entry->product_id) {
 	case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 		switch (usage->code) {
 		case ABS_X:
 			new_value = lg4ff_adjust_dfp_x_axis(value, entry->range);
 			input_event(field->hidinput->input, usage->type, usage->code, new_value);
 			return 1;
 		default:
 			return 0;
 		}
 	default:
 		return 0;
 	}
 }

 static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	__s32 *value = report->field[0]->value;
 	int x;

 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)

 	switch (effect->type) {
 	case FF_CONSTANT:
 		x = effect->u.ramp.start_level + 0x80;	/* 0x80 is no force */
 		CLAMP(x);
 		value[0] = 0x11;	/* Slot 1 */
 		value[1] = 0x08;
 		value[2] = x;
 		value[3] = 0x80;
 		value[4] = 0x00;
 		value[5] = 0x00;
 		value[6] = 0x00;

 		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 		break;
 	}
 	return 0;
 }

 /* Sends default autocentering command compatible with
  * all wheels except Formula Force EX */
 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	__s32 *value = report->field[0]->value;

 	value[0] = 0xfe;
 	value[1] = 0x0d;
 	value[2] = magnitude >> 13;
 	value[3] = magnitude >> 13;
 	value[4] = magnitude >> 8;
 	value[5] = 0x00;
 	value[6] = 0x00;

 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 }

 /* Sends autocentering command compatible with Formula Force EX */
 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	__s32 *value = report->field[0]->value;
 	magnitude = magnitude * 90 / 65535;

 	value[0] = 0xfe;
 	value[1] = 0x03;
 	value[2] = magnitude >> 14;
 	value[3] = magnitude >> 14;
 	value[4] = magnitude;
 	value[5] = 0x00;
 	value[6] = 0x00;

 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 }

 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 {
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	__s32 *value = report->field[0]->value;

 	dbg_hid("G25/G27/DFGT: setting range to %u\n", range);

 	value[0] = 0xf8;
 	value[1] = 0x81;
 	value[2] = range & 0x00ff;
 	value[3] = (range & 0xff00) >> 8;
 	value[4] = 0x00;
 	value[5] = 0x00;
 	value[6] = 0x00;

 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 }

 /* Sends commands to set range compatible with Driving Force Pro wheel */
 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 {
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	int start_left, start_right, full_range;
 	__s32 *value = report->field[0]->value;

 	dbg_hid("Driving Force Pro: setting range to %u\n", range);

 	/* Prepare "coarse" limit command */
 	value[0] = 0xf8;
 	value[1] = 0x00;	/* Set later */
 	value[2] = 0x00;
 	value[3] = 0x00;
 	value[4] = 0x00;
 	value[5] = 0x00;
 	value[6] = 0x00;

 	if (range > 200) {
 		report->field[0]->value[1] = 0x03;
 		full_range = 900;
 	} else {
 		report->field[0]->value[1] = 0x02;
 		full_range = 200;
 	}
 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);

 	/* Prepare "fine" limit command */
 	value[0] = 0x81;
 	value[1] = 0x0b;
 	value[2] = 0x00;
 	value[3] = 0x00;
 	value[4] = 0x00;
 	value[5] = 0x00;
 	value[6] = 0x00;

 	if (range == 200 || range == 900) {	/* Do not apply any fine limit */
 		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 		return;
 	}

 	/* Construct fine limit command */
 	start_left = (((full_range - range + 1) * 2047) / full_range);
 	start_right = 0xfff - start_left;

 	value[2] = start_left >> 4;
 	value[3] = start_right >> 4;
 	value[4] = 0xff;
 	value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 	value[6] = 0xff;

 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 }

 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 {
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	__u8 i, j;

 	j = 0;
 	while (j < 7*cmd->cmd_num) {
 		for (i = 0; i < 7; i++)
 			report->field[0]->value[i] = cmd->cmd[j++];

 		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 	}
 }

 /* Read current range and display it in terminal */
 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hid_device *hid = to_hid_device(dev);
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	size_t count;

 	drv_data = hid_get_drvdata(hid);
 	if (!drv_data) {
 		hid_err(hid, "Private driver data not found!\n");
 		return 0;
 	}

 	entry = drv_data->device_props;
 	if (!entry) {
 		hid_err(hid, "Device properties not found!\n");
 		return 0;
 	}

 	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 	return count;
 }

 /* Set range to user specified value, call appropriate function
  * according to the type of the wheel */
 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct hid_device *hid = to_hid_device(dev);
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	__u16 range = simple_strtoul(buf, NULL, 10);

 	drv_data = hid_get_drvdata(hid);
 	if (!drv_data) {
 		hid_err(hid, "Private driver data not found!\n");
 		return 0;
 	}

 	entry = drv_data->device_props;
 	if (!entry) {
 		hid_err(hid, "Device properties not found!\n");
 		return 0;
 	}

 	if (range == 0)
 		range = entry->max_range;

 	/* Check if the wheel supports range setting
 	 * and that the range is within limits for the wheel */
 	if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 		entry->set_range(hid, range);
 		entry->range = range;
 	}

 	return count;
 }

 #ifdef CONFIG_LEDS_CLASS
 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
 {
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	__s32 *value = report->field[0]->value;

 	value[0] = 0xf8;
 	value[1] = 0x12;
 	value[2] = leds;
 	value[3] = 0x00;
 	value[4] = 0x00;
 	value[5] = 0x00;
 	value[6] = 0x00;
 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 }

 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
 			enum led_brightness value)
 {
 	struct device *dev = led_cdev->dev->parent;
 	struct hid_device *hid = container_of(dev, struct hid_device, dev);
 	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 	struct lg4ff_device_entry *entry;
 	int i, state = 0;

 	if (!drv_data) {
 		hid_err(hid, "Device data not found.");
 		return;
 	}

 	entry = (struct lg4ff_device_entry *)drv_data->device_props;

 	if (!entry) {
 		hid_err(hid, "Device properties not found.");
 		return;
 	}

 	for (i = 0; i < 5; i++) {
 		if (led_cdev != entry->led[i])
 			continue;
 		state = (entry->led_state >> i) & 1;
 		if (value == LED_OFF && state) {
 			entry->led_state &= ~(1 << i);
 			lg4ff_set_leds(hid, entry->led_state);
 		} else if (value != LED_OFF && !state) {
 			entry->led_state |= 1 << i;
 			lg4ff_set_leds(hid, entry->led_state);
 		}
 		break;
 	}
 }

 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
 {
 	struct device *dev = led_cdev->dev->parent;
 	struct hid_device *hid = container_of(dev, struct hid_device, dev);
 	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 	struct lg4ff_device_entry *entry;
 	int i, value = 0;

 	if (!drv_data) {
 		hid_err(hid, "Device data not found.");
 		return LED_OFF;
 	}

 	entry = (struct lg4ff_device_entry *)drv_data->device_props;

 	if (!entry) {
 		hid_err(hid, "Device properties not found.");
 		return LED_OFF;
 	}

 	for (i = 0; i < 5; i++)
 		if (led_cdev == entry->led[i]) {
 			value = (entry->led_state >> i) & 1;
 			break;
 		}

 	return value ? LED_FULL : LED_OFF;
 }
 #endif

 int lg4ff_init(struct hid_device *hid)
 {
 	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 	struct input_dev *dev = hidinput->input;
 	struct hid_report *report;
 	struct hid_field *field;
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	struct usb_device_descriptor *udesc;
 	int error, i, j;
 	__u16 bcdDevice, rev_maj, rev_min;

 	/* Find the report to use */
 	if (list_empty(report_list)) {
 		hid_err(hid, "No output report found\n");
 		return -1;
 	}

 	/* Check that the report looks ok */
 	report = list_entry(report_list->next, struct hid_report, list);
 	if (!report) {
 		hid_err(hid, "NULL output report\n");
 		return -1;
 	}

 	field = report->field[0];
 	if (!field) {
 		hid_err(hid, "NULL field\n");
 		return -1;
 	}

 	/* Check what wheel has been connected */
 	for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 		if (hid->product == lg4ff_devices[i].product_id) {
 			dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 			break;
 		}
 	}

 	if (i == ARRAY_SIZE(lg4ff_devices)) {
 		hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 			     "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 		return -1;
 	}

 	/* Attempt to switch wheel to native mode when applicable */
 	udesc = &(hid_to_usb_dev(hid)->descriptor);
 	if (!udesc) {
 		hid_err(hid, "NULL USB device descriptor\n");
 		return -1;
 	}
 	bcdDevice = le16_to_cpu(udesc->bcdDevice);
 	rev_maj = bcdDevice >> 8;
 	rev_min = bcdDevice & 0xff;

 	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 		dbg_hid("Generic wheel detected, can it do native?\n");
 		dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);

 		for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 			if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 				hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 				hid_info(hid, "Switched to native mode\n");
 			}
 		}
 	}

 	/* Set supported force feedback capabilities */
 	for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 		set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);

 	error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);

 	if (error)
 		return error;

 	/* Check if autocentering is available and
 	 * set the centering force to zero by default */
 	if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 		if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN)	/* Formula Force EX expects different autocentering command */
 			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 		else
 			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;

 		dev->ff->set_autocenter(dev, 0);
 	}

 	/* Get private driver data */
 	drv_data = hid_get_drvdata(hid);
 	if (!drv_data) {
 		hid_err(hid, "Cannot add device, private driver data not allocated\n");
 		return -1;
 	}

 	/* Initialize device properties */
 	entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 	if (!entry) {
 		hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
 		return -ENOMEM;
 	}
 	drv_data->device_props = entry;

 	entry->product_id = lg4ff_devices[i].product_id;
 	entry->min_range = lg4ff_devices[i].min_range;
 	entry->max_range = lg4ff_devices[i].max_range;
 	entry->set_range = lg4ff_devices[i].set_range;

 	/* Create sysfs interface */
 	error = device_create_file(&hid->dev, &dev_attr_range);
 	if (error)
 		return error;
 	dbg_hid("sysfs interface created\n");

 	/* Set the maximum range to start with */
 	entry->range = entry->max_range;
 	if (entry->set_range != NULL)
 		entry->set_range(hid, entry->range);

 #ifdef CONFIG_LEDS_CLASS
 	/* register led subsystem - G27 only */
 	entry->led_state = 0;
 	for (j = 0; j < 5; j++)
 		entry->led[j] = NULL;

 	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
 		struct led_classdev *led;
 		size_t name_sz;
 		char *name;

 		lg4ff_set_leds(hid, 0);

 		name_sz = strlen(dev_name(&hid->dev)) + 8;

 		for (j = 0; j < 5; j++) {
 			led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 			if (!led) {
 				hid_err(hid, "can't allocate memory for LED %d\n", j);
 				goto err;
 			}

 			name = (void *)(&led[1]);
 			snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
 			led->name = name;
 			led->brightness = 0;
 			led->max_brightness = 1;
 			led->brightness_get = lg4ff_led_get_brightness;
 			led->brightness_set = lg4ff_led_set_brightness;

 			entry->led[j] = led;
 			error = led_classdev_register(&hid->dev, led);

 			if (error) {
 				hid_err(hid, "failed to register LED %d. Aborting.\n", j);
 err:
 				/* Deregister LEDs (if any) */
 				for (j = 0; j < 5; j++) {
 					led = entry->led[j];
 					entry->led[j] = NULL;
 					if (!led)
 						continue;
 					led_classdev_unregister(led);
 					kfree(led);
 				}
 				goto out;	/* Let the driver continue without LEDs */
 			}
 		}
 	}
 out:
 #endif
 	hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 	return 0;
 }


 int lg4ff_deinit(struct hid_device *hid)
 {
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;

 	device_remove_file(&hid->dev, &dev_attr_range);

 	drv_data = hid_get_drvdata(hid);
 	if (!drv_data) {
 		hid_err(hid, "Error while deinitializing device, no private driver data.\n");
 		return -1;
 	}
 	entry = drv_data->device_props;
 	if (!entry) {
 		hid_err(hid, "Error while deinitializing device, no device properties data.\n");
 		return -1;
 	}

 #ifdef CONFIG_LEDS_CLASS
 	{
 		int j;
 		struct led_classdev *led;

 		/* Deregister LEDs (if any) */
 		for (j = 0; j < 5; j++) {

 			led = entry->led[j];
 			entry->led[j] = NULL;
 			if (!led)
 				continue;
 			led_classdev_unregister(led);
 			kfree(led);
 		}
 	}
 #endif

 	/* Deallocate memory */
 	kfree(entry);

 	dbg_hid("Device successfully unregistered\n");
 	return 0;
 }
	/*
	* Force feedback support for Logitech Gaming Wheels
	*
	* Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
	* Speed Force Wireless (WiiWheel)
	*
	* Copyright (c) 2010 Simon Wood <simon@mungewell.org>
	*/

	/*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/


	#include <linux/input.h>
	#include <linux/usb.h>
	#include <linux/hid.h>

	#include "usbhid/usbhid.h"
	#include "hid-lg.h"
	#include "hid-ids.h"

	#define DFGT_REV_MAJ 0x13
	#define DFGT_REV_MIN 0x22
	#define DFGT2_REV_MIN 0x26
	#define DFP_REV_MAJ 0x11
	#define DFP_REV_MIN 0x06
	#define FFEX_REV_MAJ 0x21
	#define FFEX_REV_MIN 0x00
	#define G25_REV_MAJ 0x12
	#define G25_REV_MIN 0x22
	#define G27_REV_MAJ 0x12
	#define G27_REV_MIN 0x38

	#define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)

	static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
	static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
	static ssize_t lg4ff_range_show(struct device dev, struct device_attribute attr, char *buf);
	static ssize_t lg4ff_range_store(struct device dev, struct device_attribute attr, const char *buf, size_t count);

	static DEVICE_ATTR(range, S_IRWXU \| S_IRWXG \| S_IRWXO, lg4ff_range_show, lg4ff_range_store);

	struct lg4ff_device_entry {
	__u32 product_id;
	__u16 range;
	__u16 min_range;
	__u16 max_range;
	#ifdef CONFIG_LEDS_CLASS
	__u8 led_state;
	struct led_classdev *led[5];
	#endif
	struct list_head list;
	void (set_range)(struct hid_device hid, u16 range);
	};

	static const signed short lg4ff_wheel_effects[] = {
	FF_CONSTANT,
	FF_AUTOCENTER,
	-1
	};

	struct lg4ff_wheel {
	const __u32 product_id;
	const signed short *ff_effects;
	const __u16 min_range;
	const __u16 max_range;
	void (set_range)(struct hid_device hid, u16 range);
	};

	static const struct lg4ff_wheel lg4ff_devices[] = {
	{USB_DEVICE_ID_LOGITECH_WHEEL, lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL, lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_DFP_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
	{USB_DEVICE_ID_LOGITECH_G25_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_DFGT_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_G27_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_WII_WHEEL, lg4ff_wheel_effects, 40, 270, NULL}
	};

	struct lg4ff_native_cmd {
	const __u8 cmd_num; /* Number of commands to send */
	const __u8 cmd[];
	};

	struct lg4ff_usb_revision {
	const __u16 rev_maj;
	const __u16 rev_min;
	const struct lg4ff_native_cmd *command;
	};

	static const struct lg4ff_native_cmd native_dfp = {
	1,
	{0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
	};

	static const struct lg4ff_native_cmd native_dfgt = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1st command */
	0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00} /* 2nd command */
	};

	static const struct lg4ff_native_cmd native_g25 = {
	1,
	{0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
	};

	static const struct lg4ff_native_cmd native_g27 = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1st command */
	0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00} /* 2nd command */
	};

	static const struct lg4ff_usb_revision lg4ff_revs[] = {
	{DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt}, /* Driving Force GT */
	{DFGT_REV_MAJ, DFGT2_REV_MIN, &native_dfgt}, /* Driving Force GT v2 */
	{DFP_REV_MAJ, DFP_REV_MIN, &native_dfp}, /* Driving Force Pro */
	{G25_REV_MAJ, G25_REV_MIN, &native_g25}, /* G25 */
	{G27_REV_MAJ, G27_REV_MIN, &native_g27}, /* G27 */
	};

	/* Recalculates X axis value accordingly to currently selected range */
	static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
	{
	__u16 max_range;
	__s32 new_value;

	if (range == 900)
	return value;
	else if (range == 200)
	return value;
	else if (range < 200)
	max_range = 200;
	else
	max_range = 900;

	new_value = 8192 + mult_frac(value - 8192, max_range, range);
	if (new_value < 0)
	return 0;
	else if (new_value > 16383)
	return 16383;
	else
	return new_value;
	}

	int lg4ff_adjust_input_event(struct hid_device hid, struct hid_field field,
	struct hid_usage usage, __s32 value, struct lg_drv_data drv_data)
	{
	struct lg4ff_device_entry *entry = drv_data->device_props;
	__s32 new_value = 0;

	if (!entry) {
	hid_err(hid, "Device properties not found");
	return 0;
	}

	switch (entry->product_id) {
	case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
	switch (usage->code) {
	case ABS_X:
	new_value = lg4ff_adjust_dfp_x_axis(value, entry->range);
	input_event(field->hidinput->input, usage->type, usage->code, new_value);
	return 1;
	default:
	return 0;
	}
	default:
	return 0;
	}
	}

	static int hid_lg4ff_play(struct input_dev dev, void data, struct ff_effect *effect)
	{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;
	int x;

	#define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)

	switch (effect->type) {
	case FF_CONSTANT:
	x = effect->u.ramp.start_level + 0x80; /* 0x80 is no force */
	CLAMP(x);
	value[0] = 0x11; /* Slot 1 */
	value[1] = 0x08;
	value[2] = x;
	value[3] = 0x80;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	break;
	}
	return 0;
	}

	/* Sends default autocentering command compatible with
	* all wheels except Formula Force EX */
	static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
	{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;

	value[0] = 0xfe;
	value[1] = 0x0d;
	value[2] = magnitude >> 13;
	value[3] = magnitude >> 13;
	value[4] = magnitude >> 8;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	}

	/* Sends autocentering command compatible with Formula Force EX */
	static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
	{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;
	magnitude = magnitude * 90 / 65535;

	value[0] = 0xfe;
	value[1] = 0x03;
	value[2] = magnitude >> 14;
	value[3] = magnitude >> 14;
	value[4] = magnitude;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	}

	/* Sends command to set range compatible with G25/G27/Driving Force GT */
	static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
	{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;

	dbg_hid("G25/G27/DFGT: setting range to %u\n", range);

	value[0] = 0xf8;
	value[1] = 0x81;
	value[2] = range & 0x00ff;
	value[3] = (range & 0xff00) >> 8;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	}

	/* Sends commands to set range compatible with Driving Force Pro wheel */
	static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
	{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	int start_left, start_right, full_range;
	__s32 *value = report->field[0]->value;

	dbg_hid("Driving Force Pro: setting range to %u\n", range);

	/* Prepare "coarse" limit command */
	value[0] = 0xf8;
	value[1] = 0x00; /* Set later */
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	if (range > 200) {
	report->field[0]->value[1] = 0x03;
	full_range = 900;
	} else {
	report->field[0]->value[1] = 0x02;
	full_range = 200;
	}
	hid_hw_request(hid, report, HID_REQ_SET_REPORT);

	/* Prepare "fine" limit command */
	value[0] = 0x81;
	value[1] = 0x0b;
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	if (range == 200 \|\| range == 900) { /* Do not apply any fine limit */
	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	return;
	}

	/* Construct fine limit command */
	start_left = (((full_range - range + 1) * 2047) / full_range);
	start_right = 0xfff - start_left;

	value[2] = start_left >> 4;
	value[3] = start_right >> 4;
	value[4] = 0xff;
	value[5] = (start_right & 0xe) << 4 \| (start_left & 0xe);
	value[6] = 0xff;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	}

	static void hid_lg4ff_switch_native(struct hid_device hid, const struct lg4ff_native_cmd cmd)
	{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__u8 i, j;

	j = 0;
	while (j < 7*cmd->cmd_num) {
	for (i = 0; i < 7; i++)
	report->field[0]->value[i] = cmd->cmd[j++];

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	}
	}

	/* Read current range and display it in terminal */
	static ssize_t lg4ff_range_show(struct device dev, struct device_attribute attr, char *buf)
	{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	size_t count;

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
	hid_err(hid, "Private driver data not found!\n");
	return 0;
	}

	entry = drv_data->device_props;
	if (!entry) {
	hid_err(hid, "Device properties not found!\n");
	return 0;
	}

	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
	return count;
	}

	/* Set range to user specified value, call appropriate function
	* according to the type of the wheel */
	static ssize_t lg4ff_range_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	__u16 range = simple_strtoul(buf, NULL, 10);

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
	hid_err(hid, "Private driver data not found!\n");
	return 0;
	}

	entry = drv_data->device_props;
	if (!entry) {
	hid_err(hid, "Device properties not found!\n");
	return 0;
	}

	if (range == 0)
	range = entry->max_range;

	/* Check if the wheel supports range setting
	* and that the range is within limits for the wheel */
	if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
	entry->set_range(hid, range);
	entry->range = range;
	}

	return count;
	}

	#ifdef CONFIG_LEDS_CLASS
	static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
	{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;

	value[0] = 0xf8;
	value[1] = 0x12;
	value[2] = leds;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;
	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	}

	static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
	enum led_brightness value)
	{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hid = container_of(dev, struct hid_device, dev);
	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
	struct lg4ff_device_entry *entry;
	int i, state = 0;

	if (!drv_data) {
	hid_err(hid, "Device data not found.");
	return;
	}

	entry = (struct lg4ff_device_entry *)drv_data->device_props;

	if (!entry) {
	hid_err(hid, "Device properties not found.");
	return;
	}

	for (i = 0; i < 5; i++) {
	if (led_cdev != entry->led[i])
	continue;
	state = (entry->led_state >> i) & 1;
	if (value == LED_OFF && state) {
	entry->led_state &= ~(1 << i);
	lg4ff_set_leds(hid, entry->led_state);
	} else if (value != LED_OFF && !state) {
	entry->led_state \|= 1 << i;
	lg4ff_set_leds(hid, entry->led_state);
	}
	break;
	}
	}

	static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
	{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hid = container_of(dev, struct hid_device, dev);
	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
	struct lg4ff_device_entry *entry;
	int i, value = 0;

	if (!drv_data) {
	hid_err(hid, "Device data not found.");
	return LED_OFF;
	}

	entry = (struct lg4ff_device_entry *)drv_data->device_props;

	if (!entry) {
	hid_err(hid, "Device properties not found.");
	return LED_OFF;
	}

	for (i = 0; i < 5; i++)
	if (led_cdev == entry->led[i]) {
	value = (entry->led_state >> i) & 1;
	break;
	}

	return value ? LED_FULL : LED_OFF;
	}
	#endif

	int lg4ff_init(struct hid_device *hid)
	{
	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct input_dev *dev = hidinput->input;
	struct hid_report *report;
	struct hid_field *field;
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	struct usb_device_descriptor *udesc;
	int error, i, j;
	__u16 bcdDevice, rev_maj, rev_min;

	/* Find the report to use */
	if (list_empty(report_list)) {
	hid_err(hid, "No output report found\n");
	return -1;
	}

	/* Check that the report looks ok */
	report = list_entry(report_list->next, struct hid_report, list);
	if (!report) {
	hid_err(hid, "NULL output report\n");
	return -1;
	}

	field = report->field[0];
	if (!field) {
	hid_err(hid, "NULL field\n");
	return -1;
	}

	/* Check what wheel has been connected */
	for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
	if (hid->product == lg4ff_devices[i].product_id) {
	dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
	break;
	}
	}

	if (i == ARRAY_SIZE(lg4ff_devices)) {
	hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
	"LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
	return -1;
	}

	/* Attempt to switch wheel to native mode when applicable */
	udesc = &(hid_to_usb_dev(hid)->descriptor);
	if (!udesc) {
	hid_err(hid, "NULL USB device descriptor\n");
	return -1;
	}
	bcdDevice = le16_to_cpu(udesc->bcdDevice);
	rev_maj = bcdDevice >> 8;
	rev_min = bcdDevice & 0xff;

	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
	dbg_hid("Generic wheel detected, can it do native?\n");
	dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);

	for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
	if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
	hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
	hid_info(hid, "Switched to native mode\n");
	}
	}
	}

	/* Set supported force feedback capabilities */
	for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
	set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);

	error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);

	if (error)
	return error;

	/* Check if autocentering is available and
	* set the centering force to zero by default */
	if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
	if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN) /* Formula Force EX expects different autocentering command */
	dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
	else
	dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;

	dev->ff->set_autocenter(dev, 0);
	}

	/* Get private driver data */
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
	hid_err(hid, "Cannot add device, private driver data not allocated\n");
	return -1;
	}

	/* Initialize device properties */
	entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
	if (!entry) {
	hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
	return -ENOMEM;
	}
	drv_data->device_props = entry;

	entry->product_id = lg4ff_devices[i].product_id;
	entry->min_range = lg4ff_devices[i].min_range;
	entry->max_range = lg4ff_devices[i].max_range;
	entry->set_range = lg4ff_devices[i].set_range;

	/* Create sysfs interface */
	error = device_create_file(&hid->dev, &dev_attr_range);
	if (error)
	return error;
	dbg_hid("sysfs interface created\n");

	/* Set the maximum range to start with */
	entry->range = entry->max_range;
	if (entry->set_range != NULL)
	entry->set_range(hid, entry->range);

	#ifdef CONFIG_LEDS_CLASS
	/* register led subsystem - G27 only */
	entry->led_state = 0;
	for (j = 0; j < 5; j++)
	entry->led[j] = NULL;

	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
	struct led_classdev *led;
	size_t name_sz;
	char *name;

	lg4ff_set_leds(hid, 0);

	name_sz = strlen(dev_name(&hid->dev)) + 8;

	for (j = 0; j < 5; j++) {
	led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
	if (!led) {
	hid_err(hid, "can't allocate memory for LED %d\n", j);
	goto err;
	}

	name = (void *)(&led[1]);
	snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
	led->name = name;
	led->brightness = 0;
	led->max_brightness = 1;
	led->brightness_get = lg4ff_led_get_brightness;
	led->brightness_set = lg4ff_led_set_brightness;

	entry->led[j] = led;
	error = led_classdev_register(&hid->dev, led);

	if (error) {
	hid_err(hid, "failed to register LED %d. Aborting.\n", j);
	err:
	/* Deregister LEDs (if any) */
	for (j = 0; j < 5; j++) {
	led = entry->led[j];
	entry->led[j] = NULL;
	if (!led)
	continue;
	led_classdev_unregister(led);
	kfree(led);
	}
	goto out; /* Let the driver continue without LEDs */
	}
	}
	}
	out:
	#endif
	hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
	return 0;
	}



	int lg4ff_deinit(struct hid_device *hid)
	{
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;

	device_remove_file(&hid->dev, &dev_attr_range);

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
	hid_err(hid, "Error while deinitializing device, no private driver data.\n");
	return -1;
	}
	entry = drv_data->device_props;
	if (!entry) {
	hid_err(hid, "Error while deinitializing device, no device properties data.\n");
	return -1;
	}

	#ifdef CONFIG_LEDS_CLASS
	{
	int j;
	struct led_classdev *led;

	/* Deregister LEDs (if any) */
	for (j = 0; j < 5; j++) {

	led = entry->led[j];
	entry->led[j] = NULL;
	if (!led)
	continue;
	led_classdev_unregister(led);
	kfree(led);
	}
	}
	#endif

	/* Deallocate memory */
	kfree(entry);

	dbg_hid("Device successfully unregistered\n");
	return 0;
	}