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Code to read and write EDID chips over I2C
This commit is contained in:
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8 changed files with 528 additions and 0 deletions
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name = "windows_aarch64_gnullvm"
|
||||||
|
version = "0.42.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8c9864e83243fdec7fc9c5444389dcbbfd258f745e7853198f365e3c4968a608"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_aarch64_msvc"
|
||||||
|
version = "0.42.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "4c8b1b673ffc16c47a9ff48570a9d85e25d265735c503681332589af6253c6c7"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_gnu"
|
||||||
|
version = "0.42.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "de3887528ad530ba7bdbb1faa8275ec7a1155a45ffa57c37993960277145d640"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_msvc"
|
||||||
|
version = "0.42.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "bf4d1122317eddd6ff351aa852118a2418ad4214e6613a50e0191f7004372605"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnu"
|
||||||
|
version = "0.42.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "c1040f221285e17ebccbc2591ffdc2d44ee1f9186324dd3e84e99ac68d699c45"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnullvm"
|
||||||
|
version = "0.42.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "628bfdf232daa22b0d64fdb62b09fcc36bb01f05a3939e20ab73aaf9470d0463"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_msvc"
|
||||||
|
version = "0.42.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "447660ad36a13288b1db4d4248e857b510e8c3a225c822ba4fb748c0aafecffd"
|
||||||
12
Cargo.toml
Normal file
12
Cargo.toml
Normal file
|
|
@ -0,0 +1,12 @@
|
||||||
|
[package]
|
||||||
|
name = "rwedid"
|
||||||
|
version = "0.1.0"
|
||||||
|
license = "MIT"
|
||||||
|
description = "Read and write EDID data over an I2C bus."
|
||||||
|
keywords = ["linux"]
|
||||||
|
categories = ["embedded", "hardware-support"]
|
||||||
|
edition = "2021"
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
clap = { version = "4.1.8", features = ["derive"] }
|
||||||
|
i2cdev = "0.5.1"
|
||||||
31
readme.md
Normal file
31
readme.md
Normal file
|
|
@ -0,0 +1,31 @@
|
||||||
|
Read and Write EDID
|
||||||
|
===================
|
||||||
|
|
||||||
|
Read and write EDID data over an I2C bus.
|
||||||
|
|
||||||
|
Usage
|
||||||
|
-----
|
||||||
|
|
||||||
|
Load the Linux kernel module:
|
||||||
|
|
||||||
|
modprobe i2c-dev
|
||||||
|
|
||||||
|
|
||||||
|
Adapt the I2C bus device `/dev/i2c-4` in the examples below
|
||||||
|
to whatever matches your hardware setup.
|
||||||
|
|
||||||
|
**Note:** Be very careful to write to the correct bus!
|
||||||
|
Failing to do so may seriously damage your hardware!
|
||||||
|
|
||||||
|
|
||||||
|
To read an EDID, run (as root):
|
||||||
|
|
||||||
|
./edidread -d /dev/i2c-4 > edid.bin
|
||||||
|
|
||||||
|
To write an EDID, run (as root):
|
||||||
|
|
||||||
|
./edidwrite -d /dev/i2c-4 < edid.bin
|
||||||
|
|
||||||
|
|
||||||
|
**Note:** The `edidread` tool writes binary data to stdout which
|
||||||
|
is potentially dangerous. Redirect the output into a file or pipe.
|
||||||
24
src/args.rs
Normal file
24
src/args.rs
Normal file
|
|
@ -0,0 +1,24 @@
|
||||||
|
use clap::Parser;
|
||||||
|
|
||||||
|
// Size of EDID binary block
|
||||||
|
pub const BLOCK_SIZE: usize = 128;
|
||||||
|
|
||||||
|
fn hex_address(a: &str) -> Result<u16, std::num::ParseIntError> {
|
||||||
|
u16::from_str_radix(a.trim_start_matches("0x"), 16)
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Parser, Debug)]
|
||||||
|
#[command(version, about, long_about = None, next_line_help = true)]
|
||||||
|
pub struct Args {
|
||||||
|
/// The linux i2c device file, something like /dev/i2c-*.
|
||||||
|
#[arg(short, long)]
|
||||||
|
pub device: String,
|
||||||
|
|
||||||
|
/// The chip slave address, usually 0x50.
|
||||||
|
#[arg(short, long, default_value = "0x50", value_parser = hex_address)]
|
||||||
|
pub address: u16,
|
||||||
|
|
||||||
|
/// Number of 128-byte blocks to read, defaults to reading the base block.
|
||||||
|
#[arg(short, long, default_value_t = 1)]
|
||||||
|
pub blocks: usize,
|
||||||
|
}
|
||||||
16
src/bin/edidread.rs
Normal file
16
src/bin/edidread.rs
Normal file
|
|
@ -0,0 +1,16 @@
|
||||||
|
use clap::Parser;
|
||||||
|
use rwedid::args::*;
|
||||||
|
use rwedid::i2c::*;
|
||||||
|
use std::io::{self, Write};
|
||||||
|
|
||||||
|
fn main() -> Result<(), std::io::Error> {
|
||||||
|
// Parse command line arguments
|
||||||
|
let args = Args::parse();
|
||||||
|
|
||||||
|
// Read the data from the chip
|
||||||
|
let bytes = read_from_bus(&args.device, args.address, BLOCK_SIZE * args.blocks)?;
|
||||||
|
|
||||||
|
// Write binary blob to stdout
|
||||||
|
let mut stdout = io::stdout().lock();
|
||||||
|
stdout.write_all(&bytes)
|
||||||
|
}
|
||||||
19
src/bin/edidwrite.rs
Normal file
19
src/bin/edidwrite.rs
Normal file
|
|
@ -0,0 +1,19 @@
|
||||||
|
use clap::Parser;
|
||||||
|
use rwedid::args::*;
|
||||||
|
use rwedid::i2c::*;
|
||||||
|
use std::io::{self, Read};
|
||||||
|
|
||||||
|
fn main() -> Result<(), std::io::Error> {
|
||||||
|
// Parse command line arguments
|
||||||
|
let args = Args::parse();
|
||||||
|
|
||||||
|
// Read binary from stdin
|
||||||
|
let data_length = args.blocks * BLOCK_SIZE;
|
||||||
|
let mut data = vec![0; data_length];
|
||||||
|
|
||||||
|
// Read binary blob from stdin
|
||||||
|
io::stdin().read_exact(data.as_mut_slice())?;
|
||||||
|
|
||||||
|
// Write the data to the chip
|
||||||
|
write_to_bus(&args.device, args.address, data.as_slice())
|
||||||
|
}
|
||||||
42
src/i2c.rs
Normal file
42
src/i2c.rs
Normal file
|
|
@ -0,0 +1,42 @@
|
||||||
|
use i2cdev::core::*;
|
||||||
|
use i2cdev::linux::{LinuxI2CDevice, LinuxI2CMessage};
|
||||||
|
|
||||||
|
pub fn read_from_bus(
|
||||||
|
i2c_device: &str,
|
||||||
|
slave_address: u16,
|
||||||
|
data_length: usize,
|
||||||
|
) -> Result<Vec<u8>, std::io::Error> {
|
||||||
|
let mut data = vec![0; data_length];
|
||||||
|
|
||||||
|
let mut dev = LinuxI2CDevice::new(i2c_device, slave_address)?;
|
||||||
|
let mut msgs = [
|
||||||
|
// Address to read from
|
||||||
|
LinuxI2CMessage::write(&[0x00]),
|
||||||
|
// Read data into buffer
|
||||||
|
LinuxI2CMessage::read(&mut data),
|
||||||
|
];
|
||||||
|
|
||||||
|
match dev.transfer(&mut msgs) {
|
||||||
|
Ok(_) => Ok(data),
|
||||||
|
Err(e) => Err(e.into()),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn write_to_bus(
|
||||||
|
i2c_device: &str,
|
||||||
|
slave_address: u16,
|
||||||
|
data: &[u8],
|
||||||
|
) -> Result<(), std::io::Error> {
|
||||||
|
let mut dev = LinuxI2CDevice::new(i2c_device, slave_address)?;
|
||||||
|
let mut msgs = [
|
||||||
|
// Address to write to
|
||||||
|
LinuxI2CMessage::write(&[0x00]),
|
||||||
|
// Write data to chip
|
||||||
|
LinuxI2CMessage::write(data),
|
||||||
|
];
|
||||||
|
|
||||||
|
match dev.transfer(&mut msgs) {
|
||||||
|
Ok(_) => Ok(()),
|
||||||
|
Err(e) => Err(e.into()),
|
||||||
|
}
|
||||||
|
}
|
||||||
2
src/lib.rs
Normal file
2
src/lib.rs
Normal file
|
|
@ -0,0 +1,2 @@
|
||||||
|
pub mod args;
|
||||||
|
pub mod i2c;
|
||||||
Loading…
Reference in a new issue