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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>
#include <relabsd/config/parameters.h>
#include <relabsd/server.h>
#include <relabsd/device/physical_device.h>
/******************************************************************************/
/**** LOCAL FUNCTIONS *********************************************************/
/******************************************************************************/
/******************************************************************************/
/**** 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]
)
{
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)
&& relabsd_parameters_are_compatible_with(device->libevdev, parameters)
)
{
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_DEBUG
(
RELABSD_DEBUG_PROGRAM_FLOW,
"Opening physical device %s...",
filename
);
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
(
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;
if (!libevdev_has_event_pending(device->libevdev))
{
return 0;
}
returned_code =
libevdev_next_event
(
device->libevdev,
(
(
/*
* If we were already late, reading in NORMAL mode discards all
* the outdated input events, whereas reading in SYNC mode goes
* through them in order.
* TODO: add an option to allow users to drop events when late.
*/
(device->is_late == 1) ?
LIBEVDEV_READ_FLAG_SYNC
: LIBEVDEV_READ_FLAG_NORMAL
)
/* "The fd is not in O_NONBLOCK and a read may block." */
| LIBEVDEV_READ_FLAG_BLOCKING
),
&event
);
switch (returned_code)
{
/* Read an actual input. */
case LIBEVDEV_READ_STATUS_SUCCESS:
RELABSD_DEBUG
(
RELABSD_DEBUG_REAL_EVENTS,
"SUCCESS 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;
device->is_late = 0;
return 1;
/* Code indicating that we are late. */
case LIBEVDEV_READ_STATUS_SYNC:
/* There are old input events waiting to be read. */
device->is_late = 1;
/*
* From the documentation, the event we just read was an EV_SYN one,
* so we don't actually have any input event in hand.
*/
*input_type = event.type;
*input_code = event.code;
*input_value = event.value;
RELABSD_DEBUG
(
RELABSD_DEBUG_REAL_EVENTS,
"SYNC 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
);
return 1;
/* No event to read. */
case -EAGAIN:
device->is_late = 0;
return 0;
default:
RELABSD_FATAL
(
"Unable to access the physical device: %s.",
strerror(-returned_code)
);
relabsd_server_interrupt();
return -1;
}
}
int relabsd_physical_device_is_late
(
const struct relabsd_physical_device device [const restrict static 1]
)
{
return device->is_late;
}
int relabsd_physical_device_get_file_descriptor
(
const struct relabsd_physical_device device [const restrict static 1]
)
{
return device->file;
}
struct libevdev * relabsd_physical_device_get_libevdev
(
const struct relabsd_physical_device device [const restrict static 1]
)
{
return device->libevdev;
}
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