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// SPDX-License-Identifier: LGPL-2.1-or-later
// SPDX-FileCopyrightText: 2021 Bartosz Golaszewski <brgl@bgdev.pl>
#include <assert.h>
#include <gpiod.h>
#include <stdlib.h>
#include <string.h>
#include "internal.h"
struct gpiod_line_info {
unsigned int offset;
char name[GPIO_MAX_NAME_SIZE + 1];
bool used;
char consumer[GPIO_MAX_NAME_SIZE + 1];
enum gpiod_line_direction direction;
bool active_low;
enum gpiod_line_bias bias;
enum gpiod_line_drive drive;
enum gpiod_line_edge edge;
enum gpiod_line_clock event_clock;
bool debounced;
unsigned long debounce_period_us;
};
GPIOD_API void gpiod_line_info_free(struct gpiod_line_info *info)
{
free(info);
}
GPIOD_API struct gpiod_line_info *
gpiod_line_info_copy(struct gpiod_line_info *info)
{
struct gpiod_line_info *copy;
assert(info);
copy = malloc(sizeof(*info));
if (!copy)
return NULL;
memcpy(copy, info, sizeof(*info));
return copy;
}
GPIOD_API unsigned int gpiod_line_info_get_offset(struct gpiod_line_info *info)
{
assert(info);
return info->offset;
}
GPIOD_API const char *gpiod_line_info_get_name(struct gpiod_line_info *info)
{
assert(info);
return info->name[0] == '\0' ? NULL : info->name;
}
GPIOD_API bool gpiod_line_info_is_used(struct gpiod_line_info *info)
{
assert(info);
return info->used;
}
GPIOD_API const char *gpiod_line_info_get_consumer(struct gpiod_line_info *info)
{
assert(info);
return info->consumer[0] == '\0' ? NULL : info->consumer;
}
GPIOD_API enum gpiod_line_direction
gpiod_line_info_get_direction(struct gpiod_line_info *info)
{
assert(info);
return info->direction;
}
GPIOD_API bool gpiod_line_info_is_active_low(struct gpiod_line_info *info)
{
assert(info);
return info->active_low;
}
GPIOD_API enum gpiod_line_bias
gpiod_line_info_get_bias(struct gpiod_line_info *info)
{
assert(info);
return info->bias;
}
GPIOD_API enum gpiod_line_drive
gpiod_line_info_get_drive(struct gpiod_line_info *info)
{
assert(info);
return info->drive;
}
GPIOD_API enum gpiod_line_edge
gpiod_line_info_get_edge_detection(struct gpiod_line_info *info)
{
assert(info);
return info->edge;
}
GPIOD_API enum gpiod_line_clock
gpiod_line_info_get_event_clock(struct gpiod_line_info *info)
{
assert(info);
return info->event_clock;
}
GPIOD_API bool gpiod_line_info_is_debounced(struct gpiod_line_info *info)
{
assert(info);
return info->debounced;
}
GPIOD_API unsigned long
gpiod_line_info_get_debounce_period_us(struct gpiod_line_info *info)
{
assert(info);
return info->debounce_period_us;
}
struct gpiod_line_info *
gpiod_line_info_from_uapi(struct gpio_v2_line_info *uapi_info)
{
struct gpio_v2_line_attribute *attr;
struct gpiod_line_info *info;
size_t i;
info = malloc(sizeof(*info));
if (!info)
return NULL;
memset(info, 0, sizeof(*info));
info->offset = uapi_info->offset;
strncpy(info->name, uapi_info->name, GPIO_MAX_NAME_SIZE);
info->used = !!(uapi_info->flags & GPIO_V2_LINE_FLAG_USED);
strncpy(info->consumer, uapi_info->consumer, GPIO_MAX_NAME_SIZE);
if (uapi_info->flags & GPIO_V2_LINE_FLAG_OUTPUT)
info->direction = GPIOD_LINE_DIRECTION_OUTPUT;
else
info->direction = GPIOD_LINE_DIRECTION_INPUT;
if (uapi_info->flags & GPIO_V2_LINE_FLAG_ACTIVE_LOW)
info->active_low = true;
if (uapi_info->flags & GPIO_V2_LINE_FLAG_BIAS_PULL_UP)
info->bias = GPIOD_LINE_BIAS_PULL_UP;
else if (uapi_info->flags & GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN)
info->bias = GPIOD_LINE_BIAS_PULL_DOWN;
else if (uapi_info->flags & GPIO_V2_LINE_FLAG_BIAS_DISABLED)
info->bias = GPIOD_LINE_BIAS_DISABLED;
else
info->bias = GPIOD_LINE_BIAS_UNKNOWN;
if (uapi_info->flags & GPIO_V2_LINE_FLAG_OPEN_DRAIN)
info->drive = GPIOD_LINE_DRIVE_OPEN_DRAIN;
else if (uapi_info->flags & GPIO_V2_LINE_FLAG_OPEN_SOURCE)
info->drive = GPIOD_LINE_DRIVE_OPEN_SOURCE;
else
info->drive = GPIOD_LINE_DRIVE_PUSH_PULL;
if ((uapi_info->flags & GPIO_V2_LINE_FLAG_EDGE_RISING) &&
(uapi_info->flags & GPIO_V2_LINE_FLAG_EDGE_FALLING))
info->edge = GPIOD_LINE_EDGE_BOTH;
else if (uapi_info->flags & GPIO_V2_LINE_FLAG_EDGE_RISING)
info->edge = GPIOD_LINE_EDGE_RISING;
else if (uapi_info->flags & GPIO_V2_LINE_FLAG_EDGE_FALLING)
info->edge = GPIOD_LINE_EDGE_FALLING;
else
info->edge = GPIOD_LINE_EDGE_NONE;
if (uapi_info->flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME)
info->event_clock = GPIOD_LINE_CLOCK_REALTIME;
else if (uapi_info->flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE)
info->event_clock = GPIOD_LINE_CLOCK_HTE;
else
info->event_clock = GPIOD_LINE_CLOCK_MONOTONIC;
/*
* We assume that the kernel returns correct configuration and that no
* attributes repeat.
*/
for (i = 0; i < uapi_info->num_attrs; i++) {
attr = &uapi_info->attrs[i];
if (attr->id == GPIO_V2_LINE_ATTR_ID_DEBOUNCE) {
info->debounced = true;
info->debounce_period_us = attr->debounce_period_us;
}
}
return info;
}
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