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/**** POSIX *******************************************************************/
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
/**** LIBEVDEV ****************************************************************/
#include <libevdev/libevdev.h>
/**** RELABSD *****************************************************************/
#include <relabsd/debug.h>
/******************************************************************************/
/**** LOCAL FUNCTIONS *********************************************************/
/******************************************************************************/
/*
* 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))
{
RELABSD_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
)
{
return 0;
}
/******************************************************************************/
/**** EXPORTED FUNCTIONS ******************************************************/
/******************************************************************************/
int relabsd_physical_device_compatibility_test
(
const struct relabsd_physical_device device [const restrict static 1],
const struct relabsd_parameters parameters [const restrict static 0],
const int verbose
)
{
if (!libevdev_has_event_type(device->libevdev, EV_REL))
{
RELABSD_S_FATAL("The physical device has no relative axes.");
return -1;
}
if
(
(parameters != (const struct relabsd_parameters *) NULL)
&& (check_for_axes(device->libevdev, parameters, verbose) < 0)
)
{
RELABSD_S_FATAL
(
"Issue with the physical device's axes (or lack thereof), or their"
" compatibility with the requested configuration."
);
return -2;
}
return 0;
}
int relabsd_physical_device_open
(
const char filename [const restrict static 1],
struct relabsd_physical_device device [const restrict static 1]
)
{
int err;
RELABSD_S_DEBUG(RELABSD_DEBUG_PROGRAM_FLOW, "Opening physical device...");
errno = 0;
device->file = open(filename, O_RDONLY);
device->is_late = 0;
if (device->file == -1)
{
RELABSD_FATAL
(
"Could not open physical device '%s' in read only mode: %s.",
filename,
strerror(errno)
);
return -1;
}
err = libevdev_new_from_fd(device->file, &(device->libevdev));
if (err != 0)
{
RELABSD_FATAL
(
"libevdev could not open physical device '%s': %s.",
filename,
strerror(-err)
);
close(device->file);
return -1;
}
return 0;
}
void relabsd_physical_device_close
(
const struct relabsd_physical_device device [const restrict static 1]
)
{
RELABSD_S_DEBUG(RELABSD_DEBUG_PROGRAM_FLOW, "Closing input device...");
libevdev_free(device->libevdev);
errno = 0;
if (close(device->file) == -1)
{
RELABSD_ERROR
(
"Could not properly close the input device: %s.",
strerror(errno)
);
}
}
int relabsd_physical_device_read
(
const struct relabsd_physical_device device [const restrict static 1],
unsigned int input_type [const restrict static 1],
unsigned int input_code [const restrict static 1],
int input_value [const restrict static 1]
)
{
int returned_code;
struct input_event event;
returned_code =
libevdev_next_event
(
device->libevdev,
device->is_late ? LIBEVDEV_READ_FLAG_SYNC : LIBEVDEV_READ_FLAG_NORMAL,
&event
);
switch (returned_code)
{
case LIBEVDEV_READ_STATUS_SUCCESS:
RELABSD_DEBUG
(
RELABSD_DEBUG_REAL_EVENTS,
"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 1;
case LIBEVDEV_READ_STATUS_SYNC:
/* There are old events waiting to be read. */
device->is_late = 1;
return 0;
case -EAGAIN:
device->is_late = 0;
return -1;
}
}
int relabsd_physical_device_is_late
(
const struct relabsd_physical_device device [const restrict static 1]
)
{
return device->is_late;
}
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