rust/kernel/net/phy/reg.rs

Source file repositories/reference/linux-study-clean/rust/kernel/net/phy/reg.rs

File Facts

System
Linux kernel
Corpus path
rust/kernel/net/phy/reg.rs
Extension
.rs
Size
7653 bytes
Lines
227
Domain
Rust Kernel Layer
Bucket
Rust API Membrane
Inferred role
Rust Kernel Layer: implementation source
Status
source implementation candidate

Why This File Exists

Rust-side wrappers and abstractions around kernel C APIs, ownership contracts, allocation, synchronization, and module integration.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2024 FUJITA Tomonori <fujita.tomonori@gmail.com>

//! PHY register interfaces.
//!
//! This module provides support for accessing PHY registers in the
//! Ethernet management interface clauses 22 and 45 register namespaces, as
//! defined in IEEE 802.3.

use super::Device;
use crate::{
    build_assert::build_assert,
    error::*,
    uapi, //
};

mod private {
    /// Marker that a trait cannot be implemented outside of this crate
    pub trait Sealed {}
}

/// Accesses PHY registers.
///
/// This trait is used to implement the unified interface to access
/// C22 and C45 PHY registers.
///
/// # Examples
///
/// ```ignore
/// fn link_change_notify(dev: &mut Device) {
///     // read C22 BMCR register
///     dev.read(C22::BMCR);
///     // read C45 PMA/PMD control 1 register
///     dev.read(C45::new(Mmd::PMAPMD, 0));
///
///     // Checks the link status as reported by registers in the C22 namespace
///     // and updates current link state.
///     dev.genphy_read_status::<phy::C22>();
///     // Checks the link status as reported by registers in the C45 namespace
///     // and updates current link state.
///     dev.genphy_read_status::<phy::C45>();
/// }
/// ```
pub trait Register: private::Sealed {
    /// Reads a PHY register.
    fn read(&self, dev: &mut Device) -> Result<u16>;

    /// Writes a PHY register.
    fn write(&self, dev: &mut Device, val: u16) -> Result;

    /// Checks the link status and updates current link state.
    fn read_status(dev: &mut Device) -> Result<u16>;
}

/// A single MDIO clause 22 register address (5 bits).
#[derive(Copy, Clone, Debug)]
pub struct C22(u8);

impl C22 {
    /// Basic mode control.
    pub const BMCR: Self = C22(0x00);
    /// Basic mode status.
    pub const BMSR: Self = C22(0x01);
    /// PHY identifier 1.
    pub const PHYSID1: Self = C22(0x02);
    /// PHY identifier 2.
    pub const PHYSID2: Self = C22(0x03);
    /// Auto-negotiation advertisement.
    pub const ADVERTISE: Self = C22(0x04);
    /// Auto-negotiation link partner base page ability.
    pub const LPA: Self = C22(0x05);
    /// Auto-negotiation expansion.
    pub const EXPANSION: Self = C22(0x06);
    /// Auto-negotiation next page transmit.
    pub const NEXT_PAGE_TRANSMIT: Self = C22(0x07);
    /// Auto-negotiation link partner received next page.
    pub const LP_RECEIVED_NEXT_PAGE: Self = C22(0x08);
    /// Master-slave control.
    pub const MASTER_SLAVE_CONTROL: Self = C22(0x09);
    /// Master-slave status.
    pub const MASTER_SLAVE_STATUS: Self = C22(0x0a);
    /// PSE Control.
    pub const PSE_CONTROL: Self = C22(0x0b);
    /// PSE Status.
    pub const PSE_STATUS: Self = C22(0x0c);
    /// MMD Register control.
    pub const MMD_CONTROL: Self = C22(0x0d);
    /// MMD Register address data.
    pub const MMD_DATA: Self = C22(0x0e);

Annotation

Implementation Notes