This RFC implements a basic LED abstraction to show how this would work with rust. Currently this just implements a sample driver, to show how to use the abstraction, which just prints the requested state, supporting a on/off LED and an led with brightness level up to 255 and hardware blinking. I intend to write a hardware specific driver for submitting. The abstractions is a generic struct that holds a generic driver data on which the vtable is implemented. Because this struct also holds the c led_classdev (include/linux/leds.h) struct this struct is pinned and is using pin_init to create and directly register the LED. Dropping the struct unregisteres the LED. I plan to also add devm functions later, but as device abstractions in rust are not yet that far I opted agains that for the first iteration of the LED abstractions. This is currently using core::time::Duration for the blinking interval, but will likely change that to use the Delta time type from FUJITA Tomonori [1]. This is requiring the Opaque::try_ffi_init patch by Alice Ryhl[2] which just got merged into char-misc-testing. [1]: https://lore.kernel.org/rust-for-linux/20241005122531.20298-3-fujita.tomonori@xxxxxxxxx/ [2]: https://lore.kernel.org/rust-for-linux/20240926-b4-miscdevice-v1-1-7349c2b2837a@xxxxxxxxxx/ Fiona Behrens (2): rust: LED abstraction samples: rust: led sample rust/kernel/leds.rs | 399 +++++++++++++++++++++++++++++++++++++++ rust/kernel/lib.rs | 2 + samples/rust/Kconfig | 10 + samples/rust/Makefile | 1 + samples/rust/rust_led.rs | 103 ++++++++++ 5 files changed, 515 insertions(+) create mode 100644 rust/kernel/leds.rs create mode 100644 samples/rust/rust_led.rs -- 2.46.0
