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// SPDX-License-Identifier: LGPL-2.1-or-later
// SPDX-FileCopyrightText: 2021 Bartosz Golaszewski <brgl@bgdev.pl>
#include <assert.h>
#include <errno.h>
#include <gpiod.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "internal.h"
/* As defined in the kernel. */
#define EVENT_BUFFER_MAX_CAPACITY (GPIO_V2_LINES_MAX * 16)
struct gpiod_edge_event {
enum gpiod_edge_event_type event_type;
uint64_t timestamp;
unsigned int line_offset;
unsigned long global_seqno;
unsigned long line_seqno;
};
struct gpiod_edge_event_buffer {
size_t capacity;
size_t num_events;
struct gpiod_edge_event *events;
struct gpio_v2_line_event *event_data;
};
GPIOD_API void gpiod_edge_event_free(struct gpiod_edge_event *event)
{
free(event);
}
GPIOD_API struct gpiod_edge_event *
gpiod_edge_event_copy(struct gpiod_edge_event *event)
{
struct gpiod_edge_event *copy;
assert(event);
copy = malloc(sizeof(*event));
if (!copy)
return NULL;
memcpy(copy, event, sizeof(*event));
return copy;
}
GPIOD_API enum gpiod_edge_event_type
gpiod_edge_event_get_event_type(struct gpiod_edge_event *event)
{
assert(event);
return event->event_type;
}
GPIOD_API uint64_t
gpiod_edge_event_get_timestamp_ns(struct gpiod_edge_event *event)
{
assert(event);
return event->timestamp;
}
GPIOD_API unsigned int
gpiod_edge_event_get_line_offset(struct gpiod_edge_event *event)
{
assert(event);
return event->line_offset;
}
GPIOD_API unsigned long
gpiod_edge_event_get_global_seqno(struct gpiod_edge_event *event)
{
assert(event);
return event->global_seqno;
}
GPIOD_API unsigned long
gpiod_edge_event_get_line_seqno(struct gpiod_edge_event *event)
{
assert(event);
return event->line_seqno;
}
GPIOD_API struct gpiod_edge_event_buffer *
gpiod_edge_event_buffer_new(size_t capacity)
{
struct gpiod_edge_event_buffer *buf;
if (capacity == 0)
capacity = 64;
if (capacity > EVENT_BUFFER_MAX_CAPACITY)
capacity = EVENT_BUFFER_MAX_CAPACITY;
buf = malloc(sizeof(*buf));
if (!buf)
return NULL;
memset(buf, 0, sizeof(*buf));
buf->capacity = capacity;
buf->events = calloc(capacity, sizeof(*buf->events));
if (!buf->events) {
free(buf);
return NULL;
}
buf->event_data = calloc(capacity, sizeof(*buf->event_data));
if (!buf->event_data) {
free(buf->events);
free(buf);
return NULL;
}
return buf;
}
GPIOD_API size_t
gpiod_edge_event_buffer_get_capacity(struct gpiod_edge_event_buffer *buffer)
{
assert(buffer);
return buffer->capacity;
}
GPIOD_API void
gpiod_edge_event_buffer_free(struct gpiod_edge_event_buffer *buffer)
{
if (!buffer)
return;
free(buffer->events);
free(buffer->event_data);
free(buffer);
}
GPIOD_API struct gpiod_edge_event *
gpiod_edge_event_buffer_get_event(struct gpiod_edge_event_buffer *buffer,
unsigned long index)
{
assert(buffer);
if (index >= buffer->num_events) {
errno = EINVAL;
return NULL;
}
return &buffer->events[index];
}
GPIOD_API size_t
gpiod_edge_event_buffer_get_num_events(struct gpiod_edge_event_buffer *buffer)
{
assert(buffer);
return buffer->num_events;
}
int gpiod_edge_event_buffer_read_fd(int fd,
struct gpiod_edge_event_buffer *buffer,
size_t max_events)
{
struct gpio_v2_line_event *curr;
struct gpiod_edge_event *event;
size_t i;
ssize_t rd;
if (!buffer) {
errno = EINVAL;
return -1;
}
memset(buffer->event_data, 0,
sizeof(*buffer->event_data) * buffer->capacity);
memset(buffer->events, 0, sizeof(*buffer->events) * buffer->capacity);
if (max_events > buffer->capacity)
max_events = buffer->capacity;
rd = read(fd, buffer->event_data,
max_events * sizeof(*buffer->event_data));
if (rd < 0) {
return -1;
} else if ((unsigned int)rd < sizeof(*buffer->event_data)) {
errno = EIO;
return -1;
}
buffer->num_events = rd / sizeof(*buffer->event_data);
for (i = 0; i < buffer->num_events; i++) {
curr = &buffer->event_data[i];
event = &buffer->events[i];
event->line_offset = curr->offset;
event->event_type = curr->id == GPIO_V2_LINE_EVENT_RISING_EDGE ?
GPIOD_EDGE_EVENT_RISING_EDGE :
GPIOD_EDGE_EVENT_FALLING_EDGE;
event->timestamp = curr->timestamp_ns;
event->global_seqno = curr->seqno;
event->line_seqno = curr->line_seqno;
}
return i;
}
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