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diff --git a/lib/libusb/libusb.h b/lib/libusb/libusb.h
--- a/lib/libusb/libusb.h
+++ b/lib/libusb/libusb.h
@@ -513,6 +513,9 @@
int libusb_attach_kernel_driver(libusb_device_handle * devh, int interface);
int libusb_set_auto_detach_kernel_driver(libusb_device_handle *dev, int enable);
int libusb_set_interface_alt_setting(libusb_device_handle * devh, int interface_number, int alternate_setting);
+unsigned char *libusb_dev_mem_alloc(libusb_device_handle *devh);
+int libusb_dev_mem_free(libusb_device_handle *devh, unsigned char *buffer,
+ size_t size);
/* USB Descriptors */
diff --git a/lib/libusb/libusb.3 b/lib/libusb/libusb.3
--- a/lib/libusb/libusb.3
+++ b/lib/libusb/libusb.3
@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd June 13, 2025
+.Dd July 9, 2025
.Dt LIBUSB 3
.Os
.Sh NAME
@@ -366,6 +366,23 @@
Else disabled.
Returns 0 on success and a LIBUSB_ERROR code on
failure.
+.Pp
+.Ft unsigned char *
+.Fn libusb_dev_mem_alloc "libusb_device_handle *devh"
+This function attempts to allocate a DMA memory block from the given
+.Fa devh
+so that we can enjoy the zero-copy transfer from kernel.
+This function is provided for compatibility and is currently unimplemented and always returns NULL.
+.Pp
+.Ft int
+.Fn libusb_dev_mem_free "libusb_device_handle *devh" "unsigned char *buffer" "size_t size"
+This function frees the DMA memory in
+.Fa devh
+from the given
+.Fa buffer
+with
+.Fa size .
+This function is unimplemented and always returns LIBUSB_ERROR_NOT_SUPPORTED.
.Sh USB DESCRIPTORS
.Ft int
.Fn libusb_get_device_descriptor "libusb_device *dev" "libusb_device_descriptor *desc"
diff --git a/lib/libusb/libusb10.c b/lib/libusb/libusb10.c
--- a/lib/libusb/libusb10.c
+++ b/lib/libusb/libusb10.c
@@ -1904,3 +1904,16 @@
return (LIBUSB_ERROR_INVALID_PARAM);
}
+
+unsigned char *
+libusb_dev_mem_alloc(libusb_device_handle *devh)
+{
+ return (NULL);
+}
+
+int
+libusb_dev_mem_free(libusb_device_handle *devh, unsigned char *buffer,
+ size_t size)
+{
+ return (LIBUSB_ERROR_NOT_SUPPORTED);
+}

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