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mod cmds;
mod types;
mod utils;
pub use crate::cmds::*;
pub use crate::types::*;
use libudev::Device;
use std::cmp::min;
use std::error::Error;
use std::ffi::OsStr;
use std::fmt;
use std::fs::{File, OpenOptions};
use std::io;
use std::path::{Path, PathBuf};
#[derive(Debug)]
pub enum Mcp2210Error {
Io(io::Error),
CommandCode { expected: u8, actual: u8 },
SubCommandCode { expected: u8, actual: u8 },
InvalidResponse(String),
UnknownErrorCode(u8),
StringSize(usize),
PayloadSize(usize),
TransferStatus(SpiTransferStatus),
EepromWrite,
AccessDenied,
AccessRejected,
AccessDeniedRetry,
Unavailable,
Busy,
UnknownCommandCode(u8),
}
impl fmt::Display for Mcp2210Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use crate::Mcp2210Error::*;
match self {
Io(err) => fmt::Display::fmt(err, f),
CommandCode { expected, actual } => write!(
f,
"Invalid command code (expected {:2x}, got {:2x})",
expected, actual
),
SubCommandCode { expected, actual } => write!(
f,
"Invalid sub-command code (expected {:2x}, got {:2x})",
expected, actual
),
InvalidResponse(response) => write!(f, "Invalid response ({})", response),
UnknownErrorCode(code) => write!(f, "Unknown error code {:2x}", code),
StringSize(size) => write!(
f,
"String is too long (expected at most 29 UTF-16 encoded u16 values, got {})",
size
),
PayloadSize(size) => write!(
f,
"Payload is too big (expected at most 60 bytes, got {})",
size
),
TransferStatus(status) => write!(f, "Unexpected SPI transfer status {:?}", status),
EepromWrite => write!(f, "EEPROM write failure"),
AccessDenied => write!(f, "Access denied"),
AccessRejected => write!(f, "Access rejected"),
AccessDeniedRetry => write!(f, "Access denied, retrying allowed"),
Unavailable => write!(f, "SPI bus unavailable"),
Busy => write!(f, "SPI bus busy"),
UnknownCommandCode(code) => write!(f, "Unknown command code {:2x}", code),
}
}
}
impl Error for Mcp2210Error {
fn source(&self) -> Option<&(dyn Error + 'static)> {
use crate::Mcp2210Error::*;
match self {
Io(err) => Some(err),
_ => None,
}
}
}
pub type Buffer = [u8; 64];
pub const MAX_BIT_RATE: u32 = 12_000_000;
pub struct Mcp2210 {
file: File,
}
impl CommandResponse for Mcp2210 {
fn command_response(&mut self, cmd: &Buffer, res: &mut Buffer) -> io::Result<()> {
self.file.command_response(cmd, res)
}
}
impl Mcp2210 {
pub fn open<P: AsRef<Path>>(path: P) -> Result<Mcp2210, Mcp2210Error> {
let file = OpenOptions::new()
.read(true)
.write(true)
.open(path)
.map_err(Mcp2210Error::Io)?;
Ok(Mcp2210 { file })
}
pub fn spi_transfer_to_end(
&mut self,
mut data: &[u8],
buf: &mut Vec<u8>,
) -> Result<(), Mcp2210Error> {
let mut res: Buffer = [0; 64];
{
let len = min(data.len(), 60);
let res = self.spi_transfer(&data[..len], &mut res)?;
data = &data[len..];
if res.status != SpiTransferStatus::Started {
return Err(Mcp2210Error::TransferStatus(res.status));
}
}
loop {
let len = min(data.len(), 60);
match self.spi_transfer(&data[..len], &mut res) {
Ok(res) => {
data = &data[len..];
buf.extend(res.data);
if res.status == SpiTransferStatus::Finished {
break;
}
}
Err(Mcp2210Error::Busy) => (),
Err(err) => return Err(err),
}
}
Ok(())
}
}
pub fn scan_devices() -> io::Result<Vec<PathBuf>> {
scan_devices_with_filter(|d| {
let vendor_id = d.property_value("ID_VENDOR_ID");
let model_id = d.property_value("ID_MODEL_ID");
vendor_id == Some(OsStr::new("04d8")) && model_id == Some(OsStr::new("00de"))
})
}
pub fn scan_devices_with_filter<F: FnMut(Device) -> bool>(mut f: F) -> io::Result<Vec<PathBuf>> {
let mut results = Vec::new();
if let Ok(context) = libudev::Context::new() {
let mut enumerator = libudev::Enumerator::new(&context)?;
enumerator.match_subsystem("hidraw")?;
let devices = enumerator.scan_devices()?;
for d in devices {
if let Some(devnode) = d.devnode() {
if let Some(d) = d.parent() {
if let Some(d) = d.parent() {
if let Some(d) = d.parent() {
if d.property_value("ID_BUS") != Some(OsStr::new("usb")) {
continue;
}
if f(d) {
results.push(devnode.to_owned());
}
}
}
}
}
}
}
Ok(results)
}