1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* SPDX-License-Identifier: LGPL-2.1-only */
/* SPDX-FileCopyrightText: 2023-2025 Uwe Kleine-König <u.kleine-koenig@baylibre.com> */
#include "config.h"
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
#include <pwm.h>
#include "pwm-internal.h"
struct pwm_chip *pwm_chip_open_by_number(unsigned int num)
{
struct pwm_chip *chip;
chip = pwm_chip_cdev_open_by_number(num);
if (chip == NULL && errno == ENOENT)
chip = pwm_chip_sysfs_open_by_number(num);
return chip;
}
void pwm_chip_close(struct pwm_chip *chip)
{
chip->close(chip);
}
int pwm_chip_num_pwms(struct pwm_chip *chip)
{
return chip->npwm;
}
struct pwm *pwm_chip_get_pwm(struct pwm_chip *chip, unsigned int offset)
{
if (offset >= chip->npwm) {
errno = ENOENT;
return NULL;
}
return chip->get_pwm(chip, offset);
}
int pwm_round_waveform(struct pwm *pwm, struct pwm_waveform *wf)
{
if (!pwm->chip->round_waveform) {
errno = -ENOTSUP;
return -1;
}
if (wf->period_length_ns > INT64_MAX ||
wf->duty_length_ns > wf->period_length_ns ||
(wf->duty_offset_ns && wf->duty_offset_ns >= wf->period_length_ns)) {
errno = EINVAL;
return -1;
}
return pwm->chip->round_waveform(pwm, wf);
}
int pwm_set_waveform(struct pwm *pwm, const struct pwm_waveform *wf)
{
if (wf->period_length_ns > INT64_MAX ||
wf->duty_length_ns > wf->period_length_ns ||
(wf->duty_offset_ns && wf->duty_offset_ns >= wf->period_length_ns)) {
errno = EINVAL;
return -1;
}
return pwm->chip->set_waveform(pwm, wf);
}
int pwm_set_waveform_exact(struct pwm *pwm, const struct pwm_waveform *wf)
{
if (!pwm->chip->set_waveform_exact) {
errno = -ENOTSUP;
return -1;
}
if (wf->period_length_ns > INT64_MAX ||
wf->duty_length_ns > wf->period_length_ns ||
(wf->duty_offset_ns && wf->duty_offset_ns >= wf->period_length_ns)) {
errno = EINVAL;
return -1;
}
return pwm->chip->set_waveform_exact(pwm, wf);
}
int pwm_disable(struct pwm *pwm)
{
const struct pwm_waveform wf = { .period_length_ns = 0, };
return pwm->chip->set_waveform(pwm, &wf);
}
int pwm_get_waveform(struct pwm *pwm, struct pwm_waveform *wf)
{
return pwm->chip->get_waveform(pwm, wf);
}
|
