/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
#ifndef _UAPI_PWM_H_ #define _UAPI_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)
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