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#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <libevdev/libevdev.h>
#include "error.h"
#include "axis.h"
#include "config.h"
#include "input.h"
/*
* Ensures that the input device has enabled the EV_REL axes mentioned
* in the configuration file.
*
* Returns -1 on (fatal) error,
* 0 all configured axes are accounted for.
*/
static int check_for_axes
(
const struct libevdev * const dev,
const struct relabsd_config * const conf
)
{
int i, device_is_valid;
unsigned int rel_code;
device_is_valid = 1;
for (i = RELABSD_VALID_AXES_COUNT; i --> 0;)
{
if (conf->axis[i].enabled)
{
rel_code = relabsd_axis_to_rel((enum relabsd_axis) i);
if (!libevdev_has_event_code(dev, EV_REL, rel_code))
{
_FATAL
(
"Input device has no relative %s axis, yet the configuration "
"file asks to convert it.",
relabsd_axis_to_name((enum relabsd_axis) i)
);
device_is_valid = 0;
}
}
}
return (device_is_valid - 1);
}
/*
* Ensures that the input device is compatible with the config file.
*
* Returns -1 on (fatal) error,
* 0 is the device is compatible.
*/
static int device_is_compatible
(
const struct libevdev * const dev,
const struct relabsd_config * const conf
)
{
if (!libevdev_has_event_type(dev, EV_REL))
{
_S_FATAL("Input device has no relative axis.");
return -1;
}
if (check_for_axes(dev, conf) < 0)
{
return -1;
}
return 0;
}
int relabsd_input_open
(
struct relabsd_input * const input,
const struct relabsd_config * const conf
)
{
input->fd = open(conf->input_file, O_RDONLY);
if (input->fd < 0)
{
_FATAL
(
"Could not open device '%s' in read only mode: %s.",
conf->input_file,
strerror(errno)
);
return -1;
}
if
(
libevdev_new_from_fd(input->fd, &(input->dev)) < 0
)
{
_FATAL
(
"libevdev could not open '%s': %s.",
conf->input_file,
strerror(errno)
);
close(input->fd);
return -1;
}
if (device_is_compatible(input->dev, conf) < 0)
{
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
);
/* TODO: Look into LIBEVDEV_READ_STATUS_SYNC, handle it. */
/*
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;
}
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