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use crate::interfaces::{Interface, InterfaceRequest, InterfaceResponse};
use crate::{Device, Error};
use deku::{DekuContainerRead, DekuContainerWrite};
use std::sync::{Arc, Mutex};
const USB_TIMEOUT: std::time::Duration = std::time::Duration::from_millis(2000);
struct USBInterface<T: rusb::UsbContext> {
dev: rusb::DeviceHandle<T>,
ep_out_pkt_size: usize,
ep_out: u8,
ep_in: u8,
max_req_size: usize,
max_resp_size: usize,
}
impl<T: rusb::UsbContext> Interface for USBInterface<T> {
fn send(&mut self, req: &InterfaceRequest) -> Result<Vec<u8>, Error> {
// send request
if req.payload.len() > self.max_req_size {
// fail faster, not actually needed
return Err(Error::PacketFormat);
}
let breq = match req.to_bytes() {
Ok(v) => v,
Err(_) => return Err(Error::PacketFormat),
};
match self.dev.write_bulk(self.ep_out, &breq, USB_TIMEOUT) {
Ok(n) if n == breq.len() => (),
_ => return Err(Error::PacketTimeout),
}
if breq.len() % self.ep_out_pkt_size == 0 // manually send ZLP
&& self.dev.write_bulk(self.ep_out, &[], USB_TIMEOUT).is_err()
{
return Err(Error::PacketTimeout);
}
// parse response
let mut buf = vec![0; 4 + self.max_resp_size];
match self.dev.read_bulk(self.ep_in, &mut buf, USB_TIMEOUT) {
Ok(n) => match InterfaceResponse::from_bytes((&buf[0..n], 0)) {
Ok(((s, _), resp)) if s.len() == 0 => match Error::from(resp.retcode) {
Error::NoError => Ok(resp.payload),
e => Err(e),
},
_ => Err(Error::PacketFormat),
},
Err(_) => Err(Error::PacketTimeout),
}
}
fn set_max_req_size(&mut self, size: usize) {
self.max_req_size = size;
}
fn set_max_resp_size(&mut self, size: usize) {
self.max_resp_size = size;
}
fn reset(&mut self) {
let _ = self.dev.reset();
}
}
pub fn list_devices() -> Result<Vec<Device>, rusb::Error> {
/* Driver will attach to an interface descriptor w/ following properties
* - bAlternateSetting of 0 (default)
* - bInterfaceClass of 0xFF (Vendor Specific)
* - iInterface string descriptor of "JABI USB"
* - only 2 bulk transfer endpoints (1 IN, 1 OUT)
* - responds to a req_max_size() request
*/
let mut jabis = Vec::new();
'device: for device in rusb::devices()?.iter() {
if let Ok(cfg) = device.active_config_descriptor() {
'interface: for interface in cfg.interfaces() {
for desc in interface.descriptors() {
if desc.setting_number() != 0
|| desc.class_code() != rusb::constants::LIBUSB_CLASS_VENDOR_SPEC
|| desc.description_string_index().is_none()
|| desc.num_endpoints() != 2
{
continue;
}
let ep0 = desc.endpoint_descriptors().nth(0).unwrap();
let ep1 = desc.endpoint_descriptors().nth(1).unwrap();
if ep0.transfer_type() != rusb::TransferType::Bulk
|| ep1.transfer_type() != rusb::TransferType::Bulk
|| ep0.direction() == ep1.direction()
{
continue;
}
if let Ok(mut dev) = device.open() {
if let Ok(s) = dev
.read_string_descriptor_ascii(desc.description_string_index().unwrap())
{
if s != "JABI USB" {
continue;
}
} else {
continue 'device;
}
if dev.claim_interface(interface.number()).is_err() {
continue 'interface;
}
let (ep_out, ep_in) = if ep0.direction() == rusb::Direction::Out {
(ep0, ep1)
} else {
(ep1, ep0)
};
let iface = USBInterface {
dev: dev,
ep_out_pkt_size: ep_out.max_packet_size() as usize,
ep_out: ep_out.address(),
ep_in: ep_in.address(),
max_req_size: u16::MAX as usize,
max_resp_size: u16::MAX as usize,
};
let jabi = Device {
iface: Arc::new(Mutex::new(iface)),
};
match jabi.req_max_size() {
Ok(req_size) => {
jabi.iface().set_max_req_size(req_size);
match jabi.resp_max_size() {
Ok(resp_size) => jabi.iface().set_max_resp_size(resp_size),
Err(_) => continue 'device,
}
jabis.push(jabi)
}
Err(_) => {
// Device auto-resets on packet timeout
match jabi.req_max_size() {
Ok(req_size) => {
jabi.iface().set_max_req_size(req_size);
match jabi.resp_max_size() {
Ok(resp_size) => {
jabi.iface().set_max_resp_size(resp_size)
}
Err(_) => continue 'device,
}
jabis.push(jabi)
}
Err(_) => continue,
}
}
}
} else {
continue 'device;
}
}
}
}
}
Ok(jabis)
}