| 1 | /* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */ |
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| 2 | |
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| 3 | #ifndef _UAPI_PWM_H_ |
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| 4 | #define _UAPI_PWM_H_ |
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| 5 | |
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| 6 | #include <linux/ioctl.h> |
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| 7 | #include <linux/types.h> |
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| 8 | |
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| 9 | /** |
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| 10 | * struct pwmchip_waveform - Describe a PWM waveform for a pwm_chip's PWM channel |
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| 11 | * @hwpwm: per-chip relative index of the PWM device |
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| 12 | * @__pad: padding, must be zero |
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| 13 | * @period_length_ns: duration of the repeating period. |
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| 14 | * A value of 0 represents a disabled PWM. |
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| 15 | * @duty_length_ns: duration of the active part in each period |
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| 16 | * @duty_offset_ns: offset of the rising edge from a period's start |
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| 17 | */ |
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| 18 | struct pwmchip_waveform { |
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| 19 | __u32 hwpwm; |
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| 20 | __u32 __pad; |
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| 21 | __u64 period_length_ns; |
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| 22 | __u64 duty_length_ns; |
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| 23 | __u64 duty_offset_ns; |
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| 24 | }; |
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| 25 | |
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| 26 | /* Reserves the passed hwpwm for exclusive control. */ |
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| 27 | #define PWM_IOCTL_REQUEST _IO(0x75, 1) |
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| 28 | |
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| 29 | /* counter part to PWM_IOCTL_REQUEST */ |
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| 30 | #define PWM_IOCTL_FREE _IO(0x75, 2) |
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| 31 | |
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| 32 | /* |
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| 33 | * Modifies the passed wf according to hardware constraints. All parameters are |
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| 34 | * rounded down to the next possible value, unless there is no such value, then |
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| 35 | * values are rounded up. Note that zero isn't considered for rounding down |
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| 36 | * period_length_ns. |
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| 37 | */ |
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| 38 | #define PWM_IOCTL_ROUNDWF _IOWR(0x75, 3, struct pwmchip_waveform) |
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| 39 | |
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| 40 | /* Get the currently implemented waveform */ |
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| 41 | #define PWM_IOCTL_GETWF _IOWR(0x75, 4, struct pwmchip_waveform) |
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| 42 | |
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| 43 | /* Like PWM_IOCTL_ROUNDWF + PWM_IOCTL_SETEXACTWF in one go. */ |
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| 44 | #define PWM_IOCTL_SETROUNDEDWF _IOW(0x75, 5, struct pwmchip_waveform) |
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| 45 | |
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| 46 | /* |
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| 47 | * Program the PWM to emit exactly the passed waveform, subject only to rounding |
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| 48 | * down each value less than 1 ns. Returns 0 on success, -EDOM if the waveform |
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| 49 | * cannot be implemented exactly, or other negative error codes. |
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| 50 | */ |
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| 51 | #define PWM_IOCTL_SETEXACTWF _IOW(0x75, 6, struct pwmchip_waveform) |
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| 52 | |
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| 53 | #endif /* _UAPI_PWM_H_ */ |
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| 54 | |
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