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/dev/null +++ b/Cargo.toml @@ -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" diff --git a/readme.md b/readme.md new file mode 100644 index 0000000..3774a37 --- /dev/null +++ b/readme.md @@ -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. diff --git a/src/args.rs b/src/args.rs new file mode 100644 index 0000000..9b07992 --- /dev/null +++ b/src/args.rs @@ -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::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, +} diff --git a/src/bin/edidread.rs b/src/bin/edidread.rs new file mode 100644 index 0000000..d8bf505 --- /dev/null +++ b/src/bin/edidread.rs @@ -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) +} diff --git a/src/bin/edidwrite.rs b/src/bin/edidwrite.rs new file mode 100644 index 0000000..7a5285c --- /dev/null +++ b/src/bin/edidwrite.rs @@ -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()) +} diff --git a/src/i2c.rs b/src/i2c.rs new file mode 100644 index 0000000..2ec011f --- /dev/null +++ b/src/i2c.rs @@ -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, 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()), + } +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..3acbfe0 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,2 @@ +pub mod args; +pub mod i2c;