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// 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.
use super::error::*;
use crate::utils::{EventHandler, EventLoop};
use std::os::raw::c_short;
use std::os::unix::io::RawFd;
use std::sync::{Arc, Weak};
use sys_util::{error, WatchingEvents};
use usb_util::hotplug::UsbHotplugHandler;
use usb_util::libusb_context::{LibUsbContext, LibUsbPollfdChangeHandler};
use usb_util::libusb_device::LibUsbDevice;
use vm_control::MaybeOwnedFd;
/// Context wraps libusb context with libusb event handling.
pub struct Context {
context: LibUsbContext,
event_loop: Arc<EventLoop>,
event_handler: Arc<dyn EventHandler>,
}
impl Context {
/// Create a new context.
#[cfg(not(feature = "sandboxed-libusb"))]
pub fn new(event_loop: Arc<EventLoop>) -> Result<Context> {
let context = LibUsbContext::new().map_err(Error::CreateLibUsbContext)?;
let ctx = Context {
context: context.clone(),
event_loop,
event_handler: Arc::new(LibUsbEventHandler {
context: context.clone(),
}),
};
ctx.init_event_handler()?;
Ok(ctx)
}
#[cfg(feature = "sandboxed-libusb")]
pub fn new(event_loop: Arc<EventLoop>) -> Result<Context> {
let context = LibUsbContext::new_jailed().map_err(Error::CreateLibUsbContext)?;
let ctx = Context {
context: context.clone(),
event_loop,
event_handler: Arc::new(LibUsbEventHandler {
context: context.clone(),
}),
};
ctx.init_event_handler()?;
Ok(ctx)
}
pub fn set_hotplug_handler<H: UsbHotplugHandler + Sized>(&self, handler: H) {
if let Err(e) = self.context.set_hotplug_cb(handler) {
error!("cannot set hotplug handler: {:?}", e);
}
}
fn init_event_handler(&self) -> Result<()> {
for pollfd in self.context.get_pollfd_iter() {
usb_debug!("event loop add event {} events handler", pollfd.fd);
self.event_loop
.add_event(
&MaybeOwnedFd::Borrowed(pollfd.fd),
WatchingEvents::new(pollfd.events as u32),
Arc::downgrade(&self.event_handler),
)
.map_err(Error::AddToEventLoop)?;
}
self.context
.set_pollfd_notifiers(Box::new(PollfdChangeHandler {
event_loop: self.event_loop.clone(),
event_handler: Arc::downgrade(&self.event_handler),
}));
Ok(())
}
/// Get libusb device with matching bus, addr, vid and pid.
#[cfg(not(feature = "sandboxed-libusb"))]
pub fn get_device(&self, bus: u8, addr: u8, vid: u16, pid: u16) -> Option<LibUsbDevice> {
let device_iter = match self.context.get_device_iter() {
Ok(iter) => iter,
Err(e) => {
error!("could not get libusb device iterator: {:?}", e);
return None;
}
};
for device in device_iter {
if device.get_bus_number() == bus && device.get_address() == addr {
if let Ok(descriptor) = device.get_device_descriptor() {
if descriptor.idProduct == pid && descriptor.idVendor == vid {
return Some(device);
}
}
}
}
error!("device not found bus {}, addr {}", bus, addr);
None
}
#[cfg(feature = "sandboxed-libusb")]
pub fn get_device(&self, fd: std::fs::File) -> Option<LibUsbDevice> {
match self.context.get_device_from_fd(fd) {
Ok(dev) => Some(dev),
Err(e) => {
error!("could not build device from fd: {:?}", e);
None
}
}
}
}
struct LibUsbEventHandler {
context: LibUsbContext,
}
impl EventHandler for LibUsbEventHandler {
fn on_event(&self) -> std::result::Result<(), ()> {
self.context.handle_events_nonblock();
Ok(())
}
}
struct PollfdChangeHandler {
event_loop: Arc<EventLoop>,
event_handler: Weak<dyn EventHandler>,
}
impl LibUsbPollfdChangeHandler for PollfdChangeHandler {
fn add_poll_fd(&self, fd: RawFd, events: c_short) {
match self.event_loop.add_event(
&MaybeOwnedFd::Borrowed(fd),
WatchingEvents::new(events as u32),
self.event_handler.clone(),
) {
Err(e) => error!("cannot add event to event loop: {}", e),
Ok(_) => {}
}
}
fn remove_poll_fd(&self, fd: RawFd) {
if let Some(h) = self.event_handler.upgrade() {
match h.on_event() {
Ok(()) => {}
Err(e) => error!("cannot handle event: {:?}", e),
}
}
match self
.event_loop
.remove_event_for_fd(&MaybeOwnedFd::Borrowed(fd))
{
Ok(_) => {}
Err(e) => error!(
"failed to remove poll change handler from event loop: {}",
e
),
}
}
}
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