Add usb_sys wrapper for usbfs

This wraps the Linux USBDEVFS ioctl interfaces.

BUG=chromium:987833
TEST=./build_test.py

Change-Id: Id855c66c4eb2ac01bb65073b5dd339c1c3d45c38
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1783600
Reviewed-by: Zach Reizner <zachr@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/usb_sys/Cargo.toml b/usb_sys/Cargo.toml
new file mode 100644
index 0000000..15cc26f
--- /dev/null
+++ b/usb_sys/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "usb_sys"
+version = "0.1.0"
+authors = ["The Chromium OS Authors"]
+edition = "2018"
+
+[dependencies]
+sys_util = { path = "../sys_util" }
diff --git a/usb_sys/src/lib.rs b/usb_sys/src/lib.rs
new file mode 100644
index 0000000..fadad76
--- /dev/null
+++ b/usb_sys/src/lib.rs
@@ -0,0 +1,212 @@
+// Copyright 2019 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Translated from include/uapi/linux/usbdevice_fs.h
+
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+use std::os::raw::{c_char, c_int, c_uchar, c_uint, c_void};
+
+use sys_util::{ioctl_io_nr, ioctl_ior_nr, ioctl_iow_nr, ioctl_iowr_nr};
+
+#[repr(C)]
+#[derive(Default)]
+pub struct __IncompleteArrayField<T>(::std::marker::PhantomData<T>);
+impl<T> __IncompleteArrayField<T> {
+    #[inline]
+    pub fn new() -> Self {
+        __IncompleteArrayField(::std::marker::PhantomData)
+    }
+    #[inline]
+    pub unsafe fn as_ptr(&self) -> *const T {
+        ::std::mem::transmute(self)
+    }
+    #[inline]
+    pub unsafe fn as_mut_ptr(&mut self) -> *mut T {
+        ::std::mem::transmute(self)
+    }
+    #[inline]
+    pub unsafe fn as_slice(&self, len: usize) -> &[T] {
+        ::std::slice::from_raw_parts(self.as_ptr(), len)
+    }
+    #[inline]
+    pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] {
+        ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len)
+    }
+}
+impl<T> ::std::clone::Clone for __IncompleteArrayField<T> {
+    #[inline]
+    fn clone(&self) -> Self {
+        Self::new()
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct usbdevfs_ctrltransfer {
+    pub bRequestType: u8,
+    pub bRequest: u8,
+    pub wValue: u16,
+    pub wIndex: u16,
+    pub wLength: u16,
+    pub timeout: u32,
+    pub data: *mut c_void,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct usbdevfs_bulktransfer {
+    pub ep: c_uint,
+    pub len: c_uint,
+    pub timeout: c_uint,
+    pub data: *mut c_void,
+}
+
+#[repr(C)]
+#[derive(Default, Copy, Clone)]
+pub struct usbdevfs_setinterface {
+    pub interface: c_uint,
+    pub altsetting: c_uint,
+}
+
+#[repr(C)]
+#[derive(Default, Copy, Clone)]
+struct usbdevfs_disconnectsignal {
+    pub signr: c_uint,
+    pub context: usize,
+}
+
+pub const USBDEVFS_MAXDRIVERNAME: usize = 255;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct usbdevfs_getdriver {
+    pub interface: c_uint,
+    pub driver: [u8; USBDEVFS_MAXDRIVERNAME + 1],
+}
+
+#[repr(C)]
+#[derive(Default, Copy, Clone)]
+pub struct usbdevfs_connectinfo {
+    pub devnum: c_uint,
+    pub slow: c_char,
+}
+
+pub const USBDEVFS_URB_SHORT_NOT_OK: c_uint = 0x01;
+pub const USBDEVFS_URB_ISO_ASAP: c_uint = 0x02;
+pub const USBDEVFS_URB_BULK_CONTINUATION: c_uint = 0x04;
+pub const USBDEVFS_URB_NO_FSBR: c_uint = 0x20;
+pub const USBDEVFS_URB_ZERO_PACKET: c_uint = 0x40;
+pub const USBDEVFS_URB_NO_INTERRUPT: c_uint = 0x80;
+
+pub const USBDEVFS_URB_TYPE_ISO: c_uchar = 0;
+pub const USBDEVFS_URB_TYPE_INTERRUPT: c_uchar = 1;
+pub const USBDEVFS_URB_TYPE_CONTROL: c_uchar = 2;
+pub const USBDEVFS_URB_TYPE_BULK: c_uchar = 3;
+
+#[repr(C)]
+#[derive(Default, Copy, Clone)]
+pub struct usbdevfs_iso_packet_desc {
+    pub length: c_uint,
+    pub actual_length: c_uint,
+    pub status: c_uint,
+}
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct usbdevfs_urb {
+    pub urb_type: c_uchar,
+    pub endpoint: c_uchar,
+    pub status: c_int,
+    pub flags: c_uint,
+    pub buffer: *mut c_void,
+    pub buffer_length: c_int,
+    pub actual_length: c_int,
+    pub start_frame: c_int,
+    pub number_of_packets_or_stream_id: c_uint,
+    pub error_count: c_int,
+    pub signr: c_uint,
+    pub usercontext: usize,
+    pub iso_frame_desc: __IncompleteArrayField<usbdevfs_iso_packet_desc>,
+}
+
+impl Default for usbdevfs_urb {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct usbdevfs_ioctl {
+    pub ifno: c_int,
+    pub ioctl_code: c_int,
+    pub data: *mut c_void,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct usbdevfs_hub_portinfo {
+    pub nports: c_char,
+    pub port: [u8; 127],
+}
+
+pub const USBDEVFS_CAP_ZERO_PACKET: u32 = 0x01;
+pub const USBDEVFS_CAP_BULK_CONTINUATION: u32 = 0x02;
+pub const USBDEVFS_CAP_NO_PACKET_SIZE_LIM: u32 = 0x04;
+pub const USBDEVFS_CAP_BULK_SCATTER_GATHER: u32 = 0x08;
+pub const USBDEVFS_CAP_REAP_AFTER_DISCONNECT: u32 = 0x10;
+pub const USBDEVFS_CAP_MMAP: u32 = 0x20;
+pub const USBDEVFS_CAP_DROP_PRIVILEGES: u32 = 0x40;
+
+pub const USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER: c_uint = 0x01;
+pub const USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER: c_uint = 0x02;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct usbdevfs_disconnect_claim {
+    pub interface: c_uint,
+    pub flags: c_uint,
+    pub driver: [u8; USBDEVFS_MAXDRIVERNAME + 1],
+}
+
+#[repr(C)]
+pub struct usbdevfs_streams {
+    pub num_streams: c_uint,
+    pub num_eps: c_uint,
+    pub eps: __IncompleteArrayField<c_char>,
+}
+
+const U: u32 = 'U' as u32;
+
+ioctl_iowr_nr!(USBDEVFS_CONTROL, U, 0, usbdevfs_ctrltransfer);
+ioctl_iowr_nr!(USBDEVFS_BULK, U, 2, usbdevfs_bulktransfer);
+ioctl_ior_nr!(USBDEVFS_RESETEP, U, 3, c_uint);
+ioctl_ior_nr!(USBDEVFS_SETINTERFACE, U, 4, usbdevfs_setinterface);
+ioctl_ior_nr!(USBDEVFS_SETCONFIGURATION, U, 5, c_uint);
+ioctl_ior_nr!(USBDEVFS_GETDRIVER, U, 8, usbdevfs_getdriver);
+ioctl_ior_nr!(USBDEVFS_SUBMITURB, U, 10, usbdevfs_urb);
+ioctl_io_nr!(USBDEVFS_DISCARDURB, U, 11);
+ioctl_iow_nr!(USBDEVFS_REAPURB, U, 12, *mut *mut usbdevfs_urb);
+ioctl_iow_nr!(USBDEVFS_REAPURBNDELAY, U, 13, *mut *mut usbdevfs_urb);
+ioctl_ior_nr!(USBDEVFS_DISCSIGNAL, U, 14, usbdevfs_disconnectsignal);
+ioctl_ior_nr!(USBDEVFS_CLAIMINTERFACE, U, 15, c_uint);
+ioctl_ior_nr!(USBDEVFS_RELEASEINTERFACE, U, 16, c_uint);
+ioctl_iow_nr!(USBDEVFS_CONNECTINFO, U, 17, usbdevfs_connectinfo);
+ioctl_iowr_nr!(USBDEVFS_IOCTL, U, 18, usbdevfs_ioctl);
+ioctl_ior_nr!(USBDEVFS_HUB_PORTINFO, U, 19, usbdevfs_hub_portinfo);
+ioctl_io_nr!(USBDEVFS_RESET, U, 20);
+ioctl_ior_nr!(USBDEVFS_CLEAR_HALT, U, 21, c_uint);
+ioctl_io_nr!(USBDEVFS_DISCONNECT, U, 22);
+ioctl_io_nr!(USBDEVFS_CONNECT, U, 23);
+ioctl_ior_nr!(USBDEVFS_CLAIM_PORT, U, 24, c_uint);
+ioctl_ior_nr!(USBDEVFS_RELEASE_PORT, U, 25, c_uint);
+ioctl_ior_nr!(USBDEVFS_GET_CAPABILITIES, U, 26, u32);
+ioctl_ior_nr!(USBDEVFS_DISCONNECT_CLAIM, U, 27, usbdevfs_disconnect_claim);
+ioctl_ior_nr!(USBDEVFS_ALLOC_STREAMS, U, 28, usbdevfs_streams);
+ioctl_ior_nr!(USBDEVFS_FREE_STREAMS, U, 29, usbdevfs_streams);
+ioctl_iow_nr!(USBDEVFS_DROP_PRIVILEGES, U, 30, u32);
+ioctl_io_nr!(USBDEVFS_GET_SPEED, U, 31);