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|
// SPDX-License-Identifier: GPL-2.0
//! Rust configfs sample.
use kernel::alloc::flags;
use kernel::c_str;
use kernel::configfs;
use kernel::configfs_attrs;
use kernel::new_mutex;
use kernel::page::PAGE_SIZE;
use kernel::prelude::*;
use kernel::sync::Mutex;
module! {
type: RustConfigfs,
name: "rust_configfs",
author: "Rust for Linux Contributors",
description: "Rust configfs sample",
license: "GPL",
}
#[pin_data]
struct RustConfigfs {
#[pin]
config: configfs::Subsystem<Configuration>,
}
#[pin_data]
struct Configuration {
message: &'static CStr,
#[pin]
bar: Mutex<(KBox<[u8; PAGE_SIZE]>, usize)>,
}
impl Configuration {
fn new() -> impl PinInit<Self, Error> {
try_pin_init!(Self {
message: c_str!("Hello World\n"),
bar <- new_mutex!((KBox::new([0; PAGE_SIZE], flags::GFP_KERNEL)?, 0)),
})
}
}
impl kernel::InPlaceModule for RustConfigfs {
fn init(_module: &'static ThisModule) -> impl PinInit<Self, Error> {
pr_info!("Rust configfs sample (init)\n");
// Define a subsystem with the data type `Configuration`, two
// attributes, `message` and `bar` and child group type `Child`. `mkdir`
// in the directory representing this subsystem will create directories
// backed by the `Child` type.
let item_type = configfs_attrs! {
container: configfs::Subsystem<Configuration>,
data: Configuration,
child: Child,
attributes: [
message: 0,
bar: 1,
],
};
try_pin_init!(Self {
config <- configfs::Subsystem::new(
c_str!("rust_configfs"), item_type, Configuration::new()
),
})
}
}
#[vtable]
impl configfs::GroupOperations for Configuration {
type Child = Child;
fn make_group(&self, name: &CStr) -> Result<impl PinInit<configfs::Group<Child>, Error>> {
// Define a group with data type `Child`, one attribute `baz` and child
// group type `GrandChild`. `mkdir` in the directory representing this
// group will create directories backed by the `GrandChild` type.
let tpe = configfs_attrs! {
container: configfs::Group<Child>,
data: Child,
child: GrandChild,
attributes: [
baz: 0,
],
};
Ok(configfs::Group::new(name.try_into()?, tpe, Child::new()))
}
}
#[vtable]
impl configfs::AttributeOperations<0> for Configuration {
type Data = Configuration;
fn show(container: &Configuration, page: &mut [u8; PAGE_SIZE]) -> Result<usize> {
pr_info!("Show message\n");
let data = container.message;
page[0..data.len()].copy_from_slice(data);
Ok(data.len())
}
}
#[vtable]
impl configfs::AttributeOperations<1> for Configuration {
type Data = Configuration;
fn show(container: &Configuration, page: &mut [u8; PAGE_SIZE]) -> Result<usize> {
pr_info!("Show bar\n");
let guard = container.bar.lock();
let data = guard.0.as_slice();
let len = guard.1;
page[0..len].copy_from_slice(&data[0..len]);
Ok(len)
}
fn store(container: &Configuration, page: &[u8]) -> Result {
pr_info!("Store bar\n");
let mut guard = container.bar.lock();
guard.0[0..page.len()].copy_from_slice(page);
guard.1 = page.len();
Ok(())
}
}
// `pin_data` cannot handle structs without braces.
#[pin_data]
struct Child {}
impl Child {
fn new() -> impl PinInit<Self, Error> {
try_pin_init!(Self {})
}
}
#[vtable]
impl configfs::GroupOperations for Child {
type Child = GrandChild;
fn make_group(&self, name: &CStr) -> Result<impl PinInit<configfs::Group<GrandChild>, Error>> {
// Define a group with data type `GrandChild`, one attribute `gc`. As no
// child type is specified, it will not be possible to create subgroups
// in this group, and `mkdir`in the directory representing this group
// will return an error.
let tpe = configfs_attrs! {
container: configfs::Group<GrandChild>,
data: GrandChild,
attributes: [
gc: 0,
],
};
Ok(configfs::Group::new(
name.try_into()?,
tpe,
GrandChild::new(),
))
}
}
#[vtable]
impl configfs::AttributeOperations<0> for Child {
type Data = Child;
fn show(_container: &Child, page: &mut [u8; PAGE_SIZE]) -> Result<usize> {
pr_info!("Show baz\n");
let data = c"Hello Baz\n".to_bytes();
page[0..data.len()].copy_from_slice(data);
Ok(data.len())
}
}
// `pin_data` cannot handle structs without braces.
#[pin_data]
struct GrandChild {}
impl GrandChild {
fn new() -> impl PinInit<Self, Error> {
try_pin_init!(Self {})
}
}
#[vtable]
impl configfs::AttributeOperations<0> for GrandChild {
type Data = GrandChild;
fn show(_container: &GrandChild, page: &mut [u8; PAGE_SIZE]) -> Result<usize> {
pr_info!("Show grand child\n");
let data = c"Hello GC\n".to_bytes();
page[0..data.len()].copy_from_slice(data);
Ok(data.len())
}
}
|
