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#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <libevdev/libevdev.h>
#include "error.h"
#include "input.h"
static int check_for_axis
(
const struct libevdev * const dev,
const char * axis_name,
const unsigned int axis_id
)
{
if (!libevdev_has_event_code(dev, EV_REL, axis_id))
{
_FATAL("Input device has no %s axis.", axis_name);
return -1;
}
return 0;
}
static int device_is_compatible (const struct libevdev * const dev)
{
if (!libevdev_has_event_type(dev, EV_REL))
{
_S_FATAL("Input device has no relative axis.");
return -1;
}
if
(
(check_for_axis(dev, "X", REL_X) < 0)
| (check_for_axis(dev, "Y", REL_Y) < 0)
| (check_for_axis(dev, "Z", REL_Z) < 0)
| (check_for_axis(dev, "RX", REL_RX) < 0)
| (check_for_axis(dev, "RY", REL_RY) < 0)
| (check_for_axis(dev, "RZ", REL_RZ) < 0)
)
{
return -1;
}
return 0;
}
int relabsd_input_open
(
struct relabsd_input * const input,
const char * const filename
)
{
input->fd = open(filename, O_RDONLY);
if (input->fd < 0)
{
_FATAL
(
"Could not open device %s in read only mode:",
filename,
strerror(errno)
);
return -1;
}
if
(
libevdev_new_from_fd(input->fd, &(input->dev)) < 0
)
{
_FATAL
(
"libevdev could not open %s:",
filename,
strerror(errno)
);
close(input->fd);
return -1;
}
if (device_is_compatible(input->dev) < 0)
{
_FATAL("%s is not compatible with relabsd.", filename);
return -1;
}
return 0;
}
void relabsd_input_close (const struct relabsd_input * const input)
{
libevdev_free(input->dev);
close(input->fd);
}
int relabsd_input_read
(
const struct relabsd_input * const input,
unsigned int * const input_type,
unsigned int * const input_code,
int * const input_value
)
{
int rc;
struct input_event event;
rc =
libevdev_next_event
(
input->dev,
(LIBEVDEV_READ_FLAG_NORMAL | LIBEVDEV_READ_FLAG_BLOCKING),
&event
);
/*if (rc == LIBEVDEV_READ_STATUS_SYNC)
{
handle_syn_dropped(input->dev);
}
else*/ if (rc != LIBEVDEV_READ_STATUS_SUCCESS)
{
_WARNING("[INPUT] Could not get next event: %s.", strerror(-rc));
return -1;
}
_DEBUG
(
90,
"[INPUT] Valid event received: {type = %s; code = %s; value = %d}.",
libevdev_event_type_get_name(event.type),
libevdev_event_code_get_name(event.type, event.code),
event.value
);
*input_type = event.type;
*input_code = event.code;
*input_value = event.value;
return 0;
}
|
