diff --git a/adb/Android.mk b/adb/Android.mk
index 2f5a2ee..41cb735 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -81,17 +81,17 @@
 
 LIBADB_darwin_SRC_FILES := \
     sysdeps_unix.cpp \
-    usb_osx.cpp \
+    client/usb_osx.cpp \
 
 LIBADB_linux_SRC_FILES := \
     sysdeps_unix.cpp \
-    usb_linux.cpp \
+    client/usb_linux.cpp \
 
 LIBADB_windows_SRC_FILES := \
     sysdeps_win32.cpp \
     sysdeps/win32/errno.cpp \
     sysdeps/win32/stat.cpp \
-    usb_windows.cpp \
+    client/usb_windows.cpp \
 
 LIBADB_TEST_windows_SRCS := \
     sysdeps/win32/errno_test.cpp \
@@ -99,13 +99,26 @@
 
 include $(CLEAR_VARS)
 LOCAL_CLANG := true
+LOCAL_MODULE := libadbd_usb
+LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=0
+LOCAL_SRC_FILES := daemon/usb.cpp
+
+LOCAL_SANITIZE := $(adb_target_sanitize)
+
+# Even though we're building a static library (and thus there's no link step for
+# this to take effect), this adds the includes to our path.
+LOCAL_STATIC_LIBRARIES := libcrypto_utils libcrypto libbase
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+LOCAL_CLANG := true
 LOCAL_MODULE := libadbd
 LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=0
 LOCAL_SRC_FILES := \
     $(LIBADB_SRC_FILES) \
     adbd_auth.cpp \
     jdwp_service.cpp \
-    usb_linux_client.cpp \
 
 LOCAL_SANITIZE := $(adb_target_sanitize)
 
@@ -113,6 +126,8 @@
 # this to take effect), this adds the includes to our path.
 LOCAL_STATIC_LIBRARIES := libcrypto_utils libcrypto libbase
 
+LOCAL_WHOLE_STATIC_LIBRARIES := libadbd_usb
+
 include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -346,3 +361,5 @@
     libdebuggerd_handler \
 
 include $(BUILD_EXECUTABLE)
+
+include $(call first-makefiles-under,$(LOCAL_PATH))
diff --git a/adb/usb_linux.cpp b/adb/client/usb_linux.cpp
similarity index 100%
rename from adb/usb_linux.cpp
rename to adb/client/usb_linux.cpp
diff --git a/adb/usb_osx.cpp b/adb/client/usb_osx.cpp
similarity index 100%
rename from adb/usb_osx.cpp
rename to adb/client/usb_osx.cpp
diff --git a/adb/usb_windows.cpp b/adb/client/usb_windows.cpp
similarity index 100%
rename from adb/usb_windows.cpp
rename to adb/client/usb_windows.cpp
diff --git a/adb/usb_linux_client.cpp b/adb/daemon/usb.cpp
similarity index 93%
rename from adb/usb_linux_client.cpp
rename to adb/daemon/usb.cpp
index a21a193..a35c210 100644
--- a/adb/usb_linux_client.cpp
+++ b/adb/daemon/usb.cpp
@@ -40,13 +40,14 @@
 #include <android-base/properties.h>
 
 #include "adb.h"
+#include "daemon/usb.h"
 #include "transport.h"
 
 using namespace std::chrono_literals;
 
-#define MAX_PACKET_SIZE_FS	64
-#define MAX_PACKET_SIZE_HS	512
-#define MAX_PACKET_SIZE_SS	1024
+#define MAX_PACKET_SIZE_FS 64
+#define MAX_PACKET_SIZE_HS 512
+#define MAX_PACKET_SIZE_SS 1024
 
 // Writes larger than 16k fail on some devices (seed with 3.10.49-g209ea2f in particular).
 #define USB_FFS_MAX_WRITE 16384
@@ -55,31 +56,11 @@
 // fragmentation. 16k chosen arbitrarily to match the write limit.
 #define USB_FFS_MAX_READ 16384
 
-#define cpu_to_le16(x)  htole16(x)
-#define cpu_to_le32(x)  htole32(x)
+#define cpu_to_le16(x) htole16(x)
+#define cpu_to_le32(x) htole32(x)
 
 static int dummy_fd = -1;
 
-struct usb_handle {
-    usb_handle() : kicked(false) {
-    }
-
-    std::condition_variable notify;
-    std::mutex lock;
-    std::atomic<bool> kicked;
-    bool open_new_connection = true;
-
-    int (*write)(usb_handle *h, const void *data, int len);
-    int (*read)(usb_handle *h, void *data, int len);
-    void (*kick)(usb_handle *h);
-    void (*close)(usb_handle *h);
-
-    // FunctionFS
-    int control = -1;
-    int bulk_out = -1; /* "out" from the host's perspective => source for adbd */
-    int bulk_in = -1;  /* "in" from the host's perspective => sink for adbd */
-};
-
 struct func_desc {
     struct usb_interface_descriptor intf;
     struct usb_endpoint_descriptor_no_audio source;
@@ -223,7 +204,6 @@
     .Reserved = cpu_to_le32(0),
 };
 
-
 #define STR_INTERFACE_ "ADB Interface"
 
 static const struct {
@@ -245,7 +225,7 @@
     },
 };
 
-static bool init_functionfs(struct usb_handle* h) {
+bool init_functionfs(struct usb_handle* h) {
     ssize_t ret;
     struct desc_v1 v1_descriptor;
     struct desc_v2 v2_descriptor;
diff --git a/adb/daemon/usb.h b/adb/daemon/usb.h
new file mode 100644
index 0000000..1d85405
--- /dev/null
+++ b/adb/daemon/usb.h
@@ -0,0 +1,50 @@
+#pragma once
+
+/*
+ * Copyright (C) 2017 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 <atomic>
+#include <condition_variable>
+#include <mutex>
+
+// Writes larger than 16k fail on some devices (seed with 3.10.49-g209ea2f in particular).
+#define USB_FFS_MAX_WRITE 16384
+
+// The kernel allocates a contiguous buffer for reads, which can fail for large ones due to
+// fragmentation. 16k chosen arbitrarily to match the write limit.
+#define USB_FFS_MAX_READ 16384
+
+struct usb_handle {
+    usb_handle() : kicked(false) {
+    }
+
+    std::condition_variable notify;
+    std::mutex lock;
+    std::atomic<bool> kicked;
+    bool open_new_connection = true;
+
+    int (*write)(usb_handle* h, const void* data, int len);
+    int (*read)(usb_handle* h, void* data, int len);
+    void (*kick)(usb_handle* h);
+    void (*close)(usb_handle* h);
+
+    // FunctionFS
+    int control = -1;
+    int bulk_out = -1; /* "out" from the host's perspective => source for adbd */
+    int bulk_in = -1;  /* "in" from the host's perspective => sink for adbd */
+};
+
+bool init_functionfs(struct usb_handle* h);