diff --git a/adb/usb_libusb.c b/adb/usb_libusb.c
new file mode 100644
index 0000000..8c75266
--- /dev/null
+++ b/adb/usb_libusb.c
@@ -0,0 +1,657 @@
+/* 
+ * Copyright (C) 2009 bsdroid project
+ *               Alexey Tarasov <tarasov@dodologics.com>
+ *   
+ * Copyright (C) 2007 The Android Open Source Project
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <sys/endian.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+
+#include <err.h>
+#include <errno.h>
+#include <poll.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+#include <libusb.h>
+#include "sysdeps.h"
+
+#define   TRACE_TAG  TRACE_USB
+#include "adb.h"
+
+static adb_mutex_t usb_lock = ADB_MUTEX_INITIALIZER;
+static libusb_context *ctx = NULL;
+
+struct usb_handle
+{
+    usb_handle            *prev;
+    usb_handle            *next;
+
+    libusb_device         *dev;
+    libusb_device_handle  *devh;
+    int                   interface;
+    uint8_t               dev_bus;
+    uint8_t               dev_addr;
+	
+    int                   zero_mask;
+    unsigned char         end_point_address[2];
+    char                  serial[128];
+    
+    adb_cond_t            notify;
+    adb_mutex_t           lock;
+};
+
+static struct usb_handle handle_list = {
+        .prev = &handle_list,
+        .next = &handle_list,
+};
+
+void
+usb_cleanup()
+{
+	libusb_exit(ctx);
+}
+
+void
+report_bulk_libusb_error(int r)
+{
+    switch (r) {
+    case LIBUSB_ERROR_TIMEOUT:
+        D("Transfer timeout\n");
+        break;
+
+    case LIBUSB_ERROR_PIPE:
+        D("Control request is not supported\n");
+        break;
+
+    case LIBUSB_ERROR_OVERFLOW:
+        D("Device offered more data\n");
+        break;
+
+    case LIBUSB_ERROR_NO_DEVICE :
+        D("Device was disconnected\n");
+        break;
+
+    default:
+        D("Error %d during transfer\n", r);
+        break;
+    };
+}
+
+static int
+usb_bulk_write(usb_handle *uh, const void *data, int len)
+{
+    int r = 0;
+    int transferred = 0;
+
+    r = libusb_bulk_transfer(uh->devh, uh->end_point_address[1], (void *)data, len,
+                             &transferred, 0);
+   
+    if (r != 0) {
+        D("usb_bulk_write(): ");
+        report_bulk_libusb_error(r);
+        return r;
+    }
+   
+    return (transferred);
+}
+
+static int
+usb_bulk_read(usb_handle *uh, void *data, int len)
+{
+    int r = 0;
+    int transferred = 0;
+
+    r = libusb_bulk_transfer(uh->devh, uh->end_point_address[0], data, len,
+                             &transferred, 0);
+
+    if (r != 0) {
+        D("usb_bulk_read(): ");
+        report_bulk_libusb_error(r);
+        return r;
+    }
+   
+    return (transferred);
+}
+
+int
+usb_write(struct usb_handle *uh, const void *_data, int len)
+{
+    unsigned char *data = (unsigned char*) _data;
+    int n;
+    int need_zero = 0;
+
+    if (uh->zero_mask == 1) {
+        if (!(len & uh->zero_mask)) {
+            need_zero = 1;
+        }
+    }
+
+    D("usb_write(): %p:%d -> transport %p\n", _data, len, uh);
+    
+    while (len > 0) {
+        int xfer = (len > 4096) ? 4096 : len;
+
+        n = usb_bulk_write(uh, data, xfer);
+        
+        if (n != xfer) {
+            D("usb_write(): failed for transport %p (%d bytes left)\n", uh, len);
+            return -1;
+        }
+
+        len -= xfer;
+        data += xfer;
+    }
+
+    if (need_zero){
+        n = usb_bulk_write(uh, _data, 0);
+        
+        if (n < 0) {
+            D("usb_write(): failed to finish operation for transport %p\n", uh);
+        }
+        return n;
+    }
+
+    return 0;
+}
+
+int
+usb_read(struct usb_handle *uh, void *_data, int len)
+{
+    unsigned char *data = (unsigned char*) _data;
+    int n;
+
+    D("usb_read(): %p:%d <- transport %p\n", _data, len, uh);
+    
+    while (len > 0) {
+        int xfer = (len > 4096) ? 4096 : len;
+
+        n = usb_bulk_read(uh, data, xfer);
+        
+        if (n != xfer) {
+            if (n > 0) {
+                data += n;
+                len -= n;
+                continue;
+            }
+            
+            D("usb_read(): failed for transport %p (%d bytes left)\n", uh, len);
+            return -1;
+        }
+
+        len -= xfer;
+        data += xfer;
+    }
+
+    return 0;
+ }
+
+int
+usb_close(struct usb_handle *h)
+{
+    D("usb_close(): closing transport %p\n", h);
+    adb_mutex_lock(&usb_lock);
+    
+    h->next->prev = h->prev;
+    h->prev->next = h->next;
+    h->prev = NULL;
+    h->next = NULL;
+
+    libusb_release_interface(h->devh, h->interface);
+    libusb_close(h->devh);
+    libusb_unref_device(h->dev);
+    
+    adb_mutex_unlock(&usb_lock);
+
+    free(h);
+
+    return (0);
+}
+
+void usb_kick(struct usb_handle *h)
+{
+    D("usb_cick(): kicking transport %p\n", h);
+    
+    adb_mutex_lock(&h->lock);
+    unregister_usb_transport(h);
+    adb_mutex_unlock(&h->lock);
+    
+    h->next->prev = h->prev;
+    h->prev->next = h->next;
+    h->prev = NULL;
+    h->next = NULL;
+
+    libusb_release_interface(h->devh, h->interface);
+    libusb_close(h->devh);
+    libusb_unref_device(h->dev);
+    free(h);
+}
+
+int
+check_usb_interface(libusb_interface *interface,
+                    libusb_device_descriptor *desc,
+                    struct usb_handle *uh)
+{    
+    int e;
+    
+    if (interface->num_altsetting == 0) {
+        D("check_usb_interface(): No interface settings\n");
+        return -1;
+    }
+    
+    libusb_interface_descriptor *idesc = &interface->altsetting[0];
+    
+    if (idesc->bNumEndpoints != 2) {
+        D("check_usb_interface(): Interface have not 2 endpoints, ignoring\n");
+        return -1;
+    }
+
+    for (e = 0; e < idesc->bNumEndpoints; e++) {
+        libusb_endpoint_descriptor *edesc = &idesc->endpoint[e];
+        
+        if (edesc->bmAttributes != LIBUSB_TRANSFER_TYPE_BULK) {
+            D("check_usb_interface(): Endpoint (%u) is not bulk (%u), ignoring\n",
+                    edesc->bmAttributes, LIBUSB_TRANSFER_TYPE_BULK);
+            return -1;
+        }
+        
+        if (edesc->bEndpointAddress & LIBUSB_ENDPOINT_IN)
+            uh->end_point_address[0] = edesc->bEndpointAddress;
+        else
+            uh->end_point_address[1] = edesc->bEndpointAddress;
+        
+            /* aproto 01 needs 0 termination */
+        if (idesc->bInterfaceProtocol == 0x01) {
+            uh->zero_mask = edesc->wMaxPacketSize - 1;
+            D("check_usb_interface(): Forced Android interface protocol v.1\n");
+        }
+    }
+
+    D("check_usb_interface(): Device: %04x:%04x "
+      "iclass: %x, isclass: %x, iproto: %x ep: %x/%x-> ",
+        desc->idVendor, desc->idProduct, idesc->bInterfaceClass,
+	idesc->bInterfaceSubClass, idesc->bInterfaceProtocol,
+	uh->end_point_address[0], uh->end_point_address[1]);
+    
+    if (!is_adb_interface(desc->idVendor, desc->idProduct,
+            idesc->bInterfaceClass, idesc->bInterfaceSubClass,
+            idesc->bInterfaceProtocol))
+    {
+        D("not matches\n");
+        return -1;
+    }
+
+    D("matches\n");
+    return 1;
+}
+
+int
+check_usb_interfaces(libusb_config_descriptor *config,
+                     libusb_device_descriptor *desc, struct usb_handle *uh)
+{  
+    int i;
+    
+    for (i = 0; i < config->bNumInterfaces; ++i) {
+        if (check_usb_interface(&config->interface[i], desc, uh) != -1) {
+            /* found some interface and saved information about it */
+            D("check_usb_interfaces(): Interface %d of %04x:%04x "
+              "matches Android device\n", i, desc->idVendor,
+	      desc->idProduct);
+            
+            return  i;
+        }
+    }
+    
+    return -1;
+}
+
+int
+register_device(struct usb_handle *uh, const char *serial)
+{
+    D("register_device(): Registering %p [%s] as USB transport\n",
+       uh, serial);
+
+    struct usb_handle *usb= NULL;
+
+    usb = calloc(1, sizeof(struct usb_handle));
+    memcpy(usb, uh, sizeof(struct usb_handle));
+    strcpy(usb->serial, uh->serial);
+
+    adb_cond_init(&usb->notify, 0);
+    adb_mutex_init(&usb->lock, 0);
+
+    adb_mutex_lock(&usb_lock);
+    
+    usb->next = &handle_list;
+    usb->prev = handle_list.prev;
+    usb->prev->next = usb;
+    usb->next->prev = usb;
+
+    adb_mutex_unlock(&usb_lock);
+
+    register_usb_transport(usb, serial, 1); 
+
+    return (1);
+}
+
+int
+already_registered(usb_handle *uh)
+{
+    struct usb_handle *usb= NULL;
+    int exists = 0;
+    
+    adb_mutex_lock(&usb_lock);
+
+    for (usb = handle_list.next; usb != &handle_list; usb = usb->next) {
+        if ((usb->dev_bus == uh->dev_bus) &&
+            (usb->dev_addr == uh->dev_addr))
+        {
+            exists = 1;
+            break;
+        }
+    }
+
+    adb_mutex_unlock(&usb_lock);
+
+    return exists;
+}
+
+void
+check_device(libusb_device *dev) 
+{
+    struct usb_handle uh;
+    int i = 0;
+    int found = -1;
+    char serial[256] = {0};
+
+    libusb_device_descriptor desc;
+    libusb_config_descriptor *config = NULL;
+    
+    int r = libusb_get_device_descriptor(dev, &desc);
+
+    if (r != LIBUSB_SUCCESS) {
+        D("check_device(): Failed to get device descriptor\n");
+        return;
+    }
+    
+    if ((desc.idVendor == 0) && (desc.idProduct == 0))
+        return;
+    
+    D("check_device(): Probing usb device %04x:%04x\n",
+        desc.idVendor, desc.idProduct);
+    
+    if (!is_adb_interface (desc.idVendor, desc.idProduct,
+                           ADB_CLASS, ADB_SUBCLASS, ADB_PROTOCOL))
+    {
+        D("check_device(): Ignored due unknown vendor id\n");
+        return;
+    }
+    
+    uh.dev_bus = libusb_get_bus_number(dev);
+    uh.dev_addr = libusb_get_device_address(dev);
+    
+    if (already_registered(&uh)) {
+        D("check_device(): Device (bus: %d, address: %d) "
+          "is already registered\n", uh.dev_bus, uh.dev_addr);
+        return;
+    }
+    
+    D("check_device(): Device bus: %d, address: %d\n",
+        uh.dev_bus, uh.dev_addr);
+
+    r = libusb_get_active_config_descriptor(dev, &config);
+    
+    if (r != 0) {
+        if (r == LIBUSB_ERROR_NOT_FOUND) {
+            D("check_device(): Device %4x:%4x is unconfigured\n", 
+                desc.idVendor, desc.idProduct);
+            return;
+        }
+        
+        D("check_device(): Failed to get configuration for %4x:%4x\n",
+            desc.idVendor, desc.idProduct);
+        return;
+    }
+    
+    if (config == NULL) {
+        D("check_device(): Sanity check failed after "
+          "getting active config\n");
+        return;
+    }
+    
+    if (config->interface != NULL) {
+        found = check_usb_interfaces(config, &desc, &uh);
+    }
+    
+    /* not needed anymore */
+    libusb_free_config_descriptor(config);
+    
+    r = libusb_open(dev, &uh.devh);
+    uh.dev = dev;
+
+    if (r != 0) {
+        switch (r) {
+            case LIBUSB_ERROR_NO_MEM:
+                D("check_device(): Memory allocation problem\n");
+                break;
+                
+            case LIBUSB_ERROR_ACCESS:
+                D("check_device(): Permissions problem, "
+                  "current user priveleges are messed up?\n");
+                break;
+                
+            case LIBUSB_ERROR_NO_DEVICE:
+                D("check_device(): Device disconected, bad cable?\n");
+                break;
+            
+            default:
+                D("check_device(): libusb triggered error %d\n", r);
+        }
+        // skip rest
+        found = -1;
+    }
+    
+    if (found >= 0) {
+        D("check_device(): Device matches Android interface\n");
+        // read the device's serial number
+        memset(serial, 0, sizeof(serial));
+        uh.interface = found;
+        
+        r = libusb_claim_interface(uh.devh, uh.interface);
+        
+        if (r < 0) {
+            D("check_device(): Failed to claim interface %d\n",
+                uh.interface);
+
+            goto fail;
+        }
+
+        if (desc.iSerialNumber) {
+            // reading serial
+            uint16_t    buffer[128] = {0};
+            uint16_t    languages[128] = {0};
+            int languageCount = 0;
+
+            memset(languages, 0, sizeof(languages));
+            r = libusb_control_transfer(uh.devh, 
+                LIBUSB_ENDPOINT_IN |  LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE,
+                LIBUSB_REQUEST_GET_DESCRIPTOR, LIBUSB_DT_STRING << 8,
+		0, (uint8_t *)languages, sizeof(languages), 0);
+
+            if (r <= 0) {
+                D("check_device(): Failed to get languages count\n");
+                goto fail;
+            } 
+            
+            languageCount = (r - 2) / 2;
+            
+            for (i = 1; i <= languageCount; ++i) {
+                memset(buffer, 0, sizeof(buffer));
+
+                r = libusb_control_transfer(uh.devh, 
+                    LIBUSB_ENDPOINT_IN |  LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE,
+                    LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | desc.iSerialNumber,
+		    languages[i], (uint8_t *)buffer, sizeof(buffer), 0);
+            
+                if (r > 0) { /* converting serial */
+                    int j = 0;
+                    r /= 2;
+                
+                    for (j = 1; j < r; ++j)
+                        serial[j - 1] = buffer[j];
+                
+                    serial[j - 1] = '\0';
+                    break; /* languagesCount cycle */
+                }
+            }
+            
+            if (register_device(&uh, serial) == 0) {
+                D("check_device(): Failed to register device\n");
+                goto fail_interface;
+            }
+            
+            libusb_ref_device(dev);
+        }
+    }
+    
+    return;
+
+fail_interface:
+    libusb_release_interface(uh.devh, uh.interface);
+
+fail:
+    libusb_close(uh.devh);
+    uh.devh = NULL;
+}
+
+int
+check_device_connected(struct usb_handle *uh)
+{
+    int r = libusb_kernel_driver_active(uh->devh, uh->interface);
+    
+    if (r == LIBUSB_ERROR_NO_DEVICE)
+        return 0;
+    
+    if (r < 0)
+        return -1;
+    
+    return 1;
+}
+
+void
+kick_disconnected()
+{
+    struct usb_handle *usb= NULL;
+    
+    adb_mutex_lock(&usb_lock);
+
+    for (usb = handle_list.next; usb != &handle_list; usb = usb->next) {
+        
+        if (check_device_connected(usb) == 0) {
+            D("kick_disconnected(): Transport %p is not online anymore\n",
+                usb);
+
+            usb_kick(usb);
+        }
+    }
+    
+    adb_mutex_unlock(&usb_lock);
+}
+
+void
+scan_usb_devices()
+{
+    D("scan_usb_devices(): started\n");
+    
+    libusb_device **devs= NULL;
+    libusb_device *dev= NULL;
+    ssize_t cnt = libusb_get_device_list(ctx, &devs);
+
+    if (cnt < 0) {
+        D("scan_usb_devices(): Failed to get device list (error: %d)\n",
+            cnt);
+
+        return;
+    }
+    
+    int i = 0;
+
+    while ((dev = devs[i++]) != NULL) {
+        check_device(dev);
+    }
+
+    libusb_free_device_list(devs, 1);
+}
+
+void *
+device_poll_thread(void* unused)
+{
+    D("device_poll_thread(): Created USB scan thread\n");
+    
+    for (;;) {
+        sleep(5);
+        kick_disconnected();
+        scan_usb_devices();
+    }
+
+    /* never reaching this point */
+    return (NULL);
+}
+
+static void
+sigalrm_handler(int signo)
+{
+    /* nothing */
+}
+
+void
+usb_init()
+{
+    D("usb_init(): started\n");
+    adb_thread_t        tid;
+    struct sigaction actions;
+
+    int r = libusb_init(&ctx);
+
+    if (r != LIBUSB_SUCCESS) {
+        err(EX_IOERR, "Failed to init libusb\n");
+    }
+
+    memset(&actions, 0, sizeof(actions));
+    
+    sigemptyset(&actions.sa_mask);
+    
+    actions.sa_flags = 0;
+    actions.sa_handler = sigalrm_handler;
+    
+    sigaction(SIGALRM, &actions, NULL);
+
+	/* initial device scan */
+	scan_usb_devices();
+	
+	/* starting USB event polling thread */
+    if (adb_thread_create(&tid, device_poll_thread, NULL)) {
+            err(EX_IOERR, "cannot create USB scan thread\n");
+    }
+    
+    D("usb_init(): finished\n");
+}
+