This adds libgpiod-sys rust crate, which provides FFI (foreign function interface) bindings for libgpiod APIs.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- .gitignore | 5 ++ bindings/rust/libgpiod-sys/Cargo.toml | 15 ++++++ bindings/rust/libgpiod-sys/build.rs | 69 +++++++++++++++++++++++++++ bindings/rust/libgpiod-sys/src/lib.rs | 20 ++++++++ bindings/rust/libgpiod-sys/wrapper.h | 2 + 5 files changed, 111 insertions(+) create mode 100644 bindings/rust/libgpiod-sys/Cargo.toml create mode 100644 bindings/rust/libgpiod-sys/build.rs create mode 100644 bindings/rust/libgpiod-sys/src/lib.rs create mode 100644 bindings/rust/libgpiod-sys/wrapper.h
diff --git a/.gitignore b/.gitignore index 58e1c5fc7e00..9541482d5efb 100644 --- a/.gitignore +++ b/.gitignore @@ -33,3 +33,8 @@ stamp-h1 # profiling *.gcda *.gcno + +# Added by cargo + +target +Cargo.lock diff --git a/bindings/rust/libgpiod-sys/Cargo.toml b/bindings/rust/libgpiod-sys/Cargo.toml new file mode 100644 index 000000000000..77f82719d269 --- /dev/null +++ b/bindings/rust/libgpiod-sys/Cargo.toml @@ -0,0 +1,15 @@ +[package] +name = "libgpiod-sys" +version = "0.1.0" +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] + +[features] +generate = [ "bindgen" ] + +[build-dependencies] +bindgen = { version = "0.59.1", optional = true } +cc = "1.0.46" diff --git a/bindings/rust/libgpiod-sys/build.rs b/bindings/rust/libgpiod-sys/build.rs new file mode 100644 index 000000000000..bbcd30f79d23 --- /dev/null +++ b/bindings/rust/libgpiod-sys/build.rs @@ -0,0 +1,69 @@ +#[cfg(feature = "generate")] +extern crate bindgen; +#[cfg(feature = "generate")] +use std::env; +#[cfg(feature = "generate")] +use std::path::PathBuf; + +#[cfg(feature = "generate")] +fn generate_bindings(files: &Vec<&str>) { + // Tell cargo to invalidate the built crate whenever following files change + println!("cargo:rerun-if-changed=wrapper.h"); + + for file in files { + println!("cargo:rerun-if-changed={}", file); + } + + // The bindgen::Builder is the main entry point + // to bindgen, and lets you build up options for + // the resulting bindings. + let bindings = bindgen::Builder::default() + // The input header we would like to generate + // bindings for. + .header("wrapper.h") + // Tell cargo to invalidate the built crate whenever any of the + // included header files changed. + .parse_callbacks(Box::new(bindgen::CargoCallbacks)) + // Finish the builder and generate the bindings. + .generate() + // Unwrap the Result and panic on failure. + .expect("Unable to generate bindings"); + + // Write the bindings to the $OUT_DIR/bindings.rs file. + let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()); + bindings + .write_to_file(out_path.join("bindings.rs")) + .expect("Couldn't write bindings!"); +} + +fn build_gpiod(files: Vec<&str>) { + // Tell Cargo that if the given file changes, to rerun this build script. + println!("cargo:rerun-if-changed=../../../lib/"); + + // Use the `cc` crate to build a C file and statically link it. + cc::Build::new() + .files(files) + .define("_GNU_SOURCE", None) + .define("GPIOD_VERSION_STR", ""libgpio-sys"") + .include("../../../include") + .compile("gpiod"); +} + +fn main() { + let files = vec![ + "../../../lib/chip.c", + "../../../lib/chip-info.c", + "../../../lib/edge-event.c", + "../../../lib/info-event.c", + "../../../lib/internal.c", + "../../../lib/line-config.c", + "../../../lib/line-info.c", + "../../../lib/line-request.c", + "../../../lib/misc.c", + "../../../lib/request-config.c", + ]; + + #[cfg(feature = "generate")] + generate_bindings(&files); + build_gpiod(files); +} diff --git a/bindings/rust/libgpiod-sys/src/lib.rs b/bindings/rust/libgpiod-sys/src/lib.rs new file mode 100644 index 000000000000..3384863a567c --- /dev/null +++ b/bindings/rust/libgpiod-sys/src/lib.rs @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0 + +#[allow( + clippy::all, + deref_nullptr, + dead_code, + non_camel_case_types, + non_upper_case_globals, + non_snake_case, + improper_ctypes +)] + +mod bindings_raw { + #[cfg(feature = "generate")] + include!(concat!(env!("OUT_DIR"), "/bindings.rs")); + + #[cfg(not(feature = "generate"))] + include!("bindings.rs"); +} +pub use bindings_raw::*; diff --git a/bindings/rust/libgpiod-sys/wrapper.h b/bindings/rust/libgpiod-sys/wrapper.h new file mode 100644 index 000000000000..7bc1158b7d90 --- /dev/null +++ b/bindings/rust/libgpiod-sys/wrapper.h @@ -0,0 +1,2 @@ +#include <string.h> +#include "../../../include/gpiod.h"