mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 13:54:21 +00:00
53 lines
No EOL
1.7 KiB
C
Vendored
53 lines
No EOL
1.7 KiB
C
Vendored
/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
|
|
|
|
#ifndef _PWM_H_
|
|
#define _PWM_H_
|
|
|
|
#include <linux/ioctl.h>
|
|
#include <linux/types.h>
|
|
|
|
/**
|
|
* struct pwmchip_waveform - Describe a PWM waveform for a pwm_chip's PWM channel
|
|
* @hwpwm: per-chip relative index of the PWM device
|
|
* @__pad: padding, must be zero
|
|
* @period_length_ns: duration of the repeating period.
|
|
* A value of 0 represents a disabled PWM.
|
|
* @duty_length_ns: duration of the active part in each period
|
|
* @duty_offset_ns: offset of the rising edge from a period's start
|
|
*/
|
|
struct pwmchip_waveform {
|
|
__u32 hwpwm;
|
|
__u32 __pad;
|
|
__u64 period_length_ns;
|
|
__u64 duty_length_ns;
|
|
__u64 duty_offset_ns;
|
|
};
|
|
|
|
/* Reserves the passed hwpwm for exclusive control. */
|
|
#define PWM_IOCTL_REQUEST _IO(0x75, 1)
|
|
|
|
/* counter part to PWM_IOCTL_REQUEST */
|
|
#define PWM_IOCTL_FREE _IO(0x75, 2)
|
|
|
|
/*
|
|
* Modifies the passed wf according to hardware constraints. All parameters are
|
|
* rounded down to the next possible value, unless there is no such value, then
|
|
* values are rounded up. Note that zero isn't considered for rounding down
|
|
* period_length_ns.
|
|
*/
|
|
#define PWM_IOCTL_ROUNDWF _IOWR(0x75, 3, struct pwmchip_waveform)
|
|
|
|
/* Get the currently implemented waveform */
|
|
#define PWM_IOCTL_GETWF _IOWR(0x75, 4, struct pwmchip_waveform)
|
|
|
|
/* Like PWM_IOCTL_ROUNDWF + PWM_IOCTL_SETEXACTWF in one go. */
|
|
#define PWM_IOCTL_SETROUNDEDWF _IOW(0x75, 5, struct pwmchip_waveform)
|
|
|
|
/*
|
|
* Program the PWM to emit exactly the passed waveform, subject only to rounding
|
|
* down each value less than 1 ns. Returns 0 on success, -EDOM if the waveform
|
|
* cannot be implemented exactly, or other negative error codes.
|
|
*/
|
|
#define PWM_IOCTL_SETEXACTWF _IOW(0x75, 6, struct pwmchip_waveform)
|
|
|
|
#endif /* _PWM_H_ */ |