mirror of
https://codeberg.org/ral/rwedid.git
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Code to read and write EDID chips over I2C
This commit is contained in:
Ral
Undefined
parent
f79855fdbd
commit
268353af35
8 changed files with 528 additions and 0 deletions
382
Cargo.lock
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382
Cargo.lock
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12
Cargo.toml
Normal file
12
Cargo.toml
Normal file
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@ -0,0 +1,12 @@
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[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]
|
||||
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|
||||
i2cdev = "0.5.1"
|
||||
31
readme.md
Normal file
31
readme.md
Normal file
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@ -0,0 +1,31 @@
|
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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