bindings: rust: Add libgpiod-sys rust crate

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>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

diff --git a/bindings/rust/.gitignore b/bindings/rust/.gitignore
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index 0000000..95054d9
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+++ b/bindings/rust/.gitignore
@@ -0,0 +1,4 @@
+# Added by cargo
+
+target
+Cargo.lock

diff --git a/bindings/rust/Cargo.toml b/bindings/rust/Cargo.toml
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+++ b/bindings/rust/Cargo.toml
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+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: 2022 Linaro Ltd.
+# SPDX-FileCopyrightTest: 2022 Viresh Kumar <viresh.kumar@linaro.org>
+
+[workspace]
+
+members = [
+    "libgpiod-sys"
+]

diff --git a/bindings/rust/libgpiod-sys/Cargo.toml b/bindings/rust/libgpiod-sys/Cargo.toml
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+++ b/bindings/rust/libgpiod-sys/Cargo.toml
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+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: 2022 Linaro Ltd.
+# SPDX-FileCopyrightTest: 2022 Viresh Kumar <viresh.kumar@linaro.org>
+
+[package]
+name = "libgpiod-sys"
+version = "0.1.0"
+authors = ["Viresh Kumar <viresh.kumar@linaro.org>"]
+description = "libgpiod public header bindings"
+repository = "https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git"
+categories = ["external-ffi-bindings", "os::linux-apis"]
+rust-version = "1.56"
+keywords = ["libgpiod", "gpio"]
+license = "Apache-2.0 OR BSD-3-Clause"
+edition = "2021"
+
+[dependencies]
+
+[build-dependencies]
+bindgen = "0.59.1"
+cc = "1.0.46"

diff --git a/bindings/rust/libgpiod-sys/README.md b/bindings/rust/libgpiod-sys/README.md
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index 0000000..7e6e643
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+++ b/bindings/rust/libgpiod-sys/README.md
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+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: 2022 Linaro Ltd.
+# SPDX-FileCopyrightTest: 2022 Viresh Kumar <viresh.kumar@linaro.org>
+
+# Generated libgpiod-sys Rust FFI bindings
+Automatically generated Rust FFI bindings via
+       [bindgen](https://github.com/rust-lang/rust-bindgen).
+
+## License
+
+This project is licensed under either of
+
+- [Apache License](http://www.apache.org/licenses/LICENSE-2.0), Version 2.0
+- [BSD-3-Clause License](https://opensource.org/licenses/BSD-3-Clause)

diff --git a/bindings/rust/libgpiod-sys/build.rs b/bindings/rust/libgpiod-sys/build.rs
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+++ b/bindings/rust/libgpiod-sys/build.rs
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+// SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
+// SPDX-FileCopyrightText: 2022 Linaro Ltd.
+// SPDX-FileCopyrightTest: 2022 Viresh Kumar <viresh.kumar@linaro.org>
+
+extern crate bindgen;
+
+use std::env;
+use std::path::PathBuf;
+
+fn generate_bindings() {
+    // Tell cargo to invalidate the built crate whenever following files change
+    println!("cargo:rerun-if-changed=../../../include/gpiod.h");
+
+    // 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("../../../include/gpiod.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 main() {
+    generate_bindings();
+
+    println!("cargo:rustc-link-search=./../../lib/.libs/");
+    println!("cargo:rustc-link-lib=static=gpiod");
+}

diff --git a/bindings/rust/libgpiod-sys/src/lib.rs b/bindings/rust/libgpiod-sys/src/lib.rs
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+++ b/bindings/rust/libgpiod-sys/src/lib.rs
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+// SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
+// SPDX-FileCopyrightText: 2022 Linaro Ltd.
+// SPDX-FileCopyrightTest: 2022 Viresh Kumar <viresh.kumar@linaro.org>
+
+#[allow(non_camel_case_types, non_upper_case_globals)]
+#[cfg_attr(test, allow(deref_nullptr, non_snake_case))]
+
+mod bindings_raw {
+    include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+}
+pub use bindings_raw::*;