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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2025 Samsung Electronics Co., Ltd.
// Author: Michal Wilczynski <m.wilczynski@samsung.com>
//! PWM subsystem abstractions.
//!
//! C header: [`include/linux/pwm.h`](srctree/include/linux/pwm.h).
use crate::{
bindings,
prelude::*,
types::Opaque,
};
use core::convert::TryFrom;
/// PWM polarity. Mirrors [`enum pwm_polarity`](srctree/include/linux/pwm.h).
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum Polarity {
/// Normal polarity (duty cycle defines the high period of the signal).
Normal,
/// Inversed polarity (duty cycle defines the low period of the signal).
Inversed,
}
impl TryFrom<bindings::pwm_polarity> for Polarity {
type Error = Error;
fn try_from(polarity: bindings::pwm_polarity) -> Result<Self, Error> {
match polarity {
bindings::pwm_polarity_PWM_POLARITY_NORMAL => Ok(Polarity::Normal),
bindings::pwm_polarity_PWM_POLARITY_INVERSED => Ok(Polarity::Inversed),
_ => Err(EINVAL),
}
}
}
impl From<Polarity> for bindings::pwm_polarity {
fn from(polarity: Polarity) -> Self {
match polarity {
Polarity::Normal => bindings::pwm_polarity_PWM_POLARITY_NORMAL,
Polarity::Inversed => bindings::pwm_polarity_PWM_POLARITY_INVERSED,
}
}
}
/// Represents a PWM waveform configuration.
/// Mirrors struct [`struct pwm_waveform`](srctree/include/linux/pwm.h).
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
pub struct Waveform {
/// Total duration of one complete PWM cycle, in nanoseconds.
pub period_length_ns: u64,
/// Duty-cycle active time, in nanoseconds.
///
/// For a typical normal polarity configuration (active-high) this is the
/// high time of the signal.
pub duty_length_ns: u64,
/// Duty-cycle start offset, in nanoseconds.
///
/// Delay from the beginning of the period to the first active edge.
/// In most simple PWM setups this is `0`, so the duty cycle starts
/// immediately at each period’s start.
pub duty_offset_ns: u64,
}
impl From<bindings::pwm_waveform> for Waveform {
fn from(wf: bindings::pwm_waveform) -> Self {
Waveform {
period_length_ns: wf.period_length_ns,
duty_length_ns: wf.duty_length_ns,
duty_offset_ns: wf.duty_offset_ns,
}
}
}
impl From<Waveform> for bindings::pwm_waveform {
fn from(wf: Waveform) -> Self {
bindings::pwm_waveform {
period_length_ns: wf.period_length_ns,
duty_length_ns: wf.duty_length_ns,
duty_offset_ns: wf.duty_offset_ns,
}
}
}
/// Wrapper for PWM state [`struct pwm_state`](srctree/include/linux/pwm.h).
#[repr(transparent)]
pub struct State(bindings::pwm_state);
impl State {
/// Creates a `State` wrapper by taking ownership of a C `pwm_state` value.
pub(crate) fn from_c(c_state: bindings::pwm_state) -> Self {
State(c_state)
}
/// Returns `true` if the PWM signal is enabled.
pub fn enabled(&self) -> bool {
self.0.enabled
}
}
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