hid-lg4ff.c

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/*
 *  Force feedback support for Logitech Gaming Wheels
 *
 *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
 *  Speed Force Wireless (WiiWheel)
 *
 *  Copyright (c) 2010 Simon Wood <[email protected]>
 */

/*
 * 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 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 DFP_X_MIN 0
#define DFP_X_MAX 16383
#define DFP_PEDAL_MIN 0
#define DFP_PEDAL_MAX 255

#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 */
    {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;

        usbhid_submit_report(hid, report, USB_DIR_OUT);
        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;

    usbhid_submit_report(hid, report, USB_DIR_OUT);
}

/* 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;

    usbhid_submit_report(hid, report, USB_DIR_OUT);
}

/* 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;

    usbhid_submit_report(hid, report, USB_DIR_OUT);
}

/* 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;
    }
    usbhid_submit_report(hid, report, USB_DIR_OUT);

    /* 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 */
        usbhid_submit_report(hid, report, USB_DIR_OUT);
        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;

    usbhid_submit_report(hid, report, USB_DIR_OUT);
}

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++];

        usbhid_submit_report(hid, report, USB_DIR_OUT);
    }
}

/* 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;
    usbhid_submit_report(hid, report, USB_DIR_OUT);
}

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 <[email protected]> or Michal Maly <[email protected]>\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 default axes parameters */
    switch (lg4ff_devices[i].product_id) {
    case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
        dbg_hid("Setting axes parameters for Driving Force Pro\n");
        input_set_abs_params(dev, ABS_X, DFP_X_MIN, DFP_X_MAX, 0, 0);
        input_set_abs_params(dev, ABS_Y, DFP_PEDAL_MIN, DFP_PEDAL_MAX, 0, 0);
        input_set_abs_params(dev, ABS_RZ, DFP_PEDAL_MIN, DFP_PEDAL_MAX, 0, 0);
        break;
    default:
        break;
    }

    /* 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;
}