1 files changed, 71 insertions, 0 deletions
diff --git a/include/relabsd/device/virtual_device.h b/include/relabsd/device/virtual_device.h
new file mode 100644
index 0000000..d398c7f
--- /dev/null
+++ b/include/relabsd/device/virtual_device.h
@@ -0,0 +1,71 @@
+#pragma once
+
+#include <libevdev/libevdev.h>
+#include <libevdev/libevdev-uinput.h>
+
+/*
+   LIBEVDEV_UINPUT_OPEN_MANAGED is not defined on my machines.
+   It is not my place to define it, so I'll avoid the issue by defining my own
+   constant.
+*/
+#ifndef LIBEVDEV_UINPUT_OPEN_MANAGED
+   #pragma message "[WARNING] libevdev did not define " \
+      "LIBEVDEV_UINPUT_OPEN_MANAGED, using value '-2' instead."
+   #define RELABSD_UINPUT_OPEN_MANAGED -2
+#else
+   #define RELABSD_UINPUT_OPEN_MANAGED LIBEVDEV_UINPUT_OPEN_MANAGED
+#endif
+
+struct relabsd_device
+{
+   struct libevdev * dev;
+   struct libevdev_uinput * uidev;
+};
+
+/*
+ * - Clones the (real) input device.
+ * - Adds ABS event support to the clone.
+ * - Adds the ABS axis described in 'config' to the clone (overwriting if
+ *   needed).
+ * - Disables the associated REL events from the clone.
+ *
+ * Returns -1 on (fatal) error,
+ *         0  on success.
+ *
+ * 'dev' does not need to be initialized, as the function will to that for you
+ * (on success).
+ * On success, 'dev' will need to be closed.
+ * This opens the (real) input device in read only mode to copy its properties.
+ */
+int relabsd_device_create
+(
+   struct relabsd_device * const dev,
+   const struct relabsd_config * const config
+);
+
+void relabsd_device_destroy (const struct relabsd_device * const dev);
+
+/*
+ * Write an event to 'dev'. At this time, every event written to 'dev' is
+ * followed by an EV_SYN event.
+ *
+ * Returns 0 if both the event and the EV_SYN were successful,
+ *         -1 if either failed.
+ */
+int relabsd_device_write_evdev_event
+(
+   const struct relabsd_device * const dev,
+   unsigned int const type,
+   unsigned int const code,
+   int const value
+);
+
+/*
+ * Send an event for each enabled axis, setting it to zero.
+ * An EV_SYN event is sent afterwards.
+ */
+void relabsd_device_set_axes_to_zero
+(
+   const struct relabsd_device * const dev,
+   const struct relabsd_config * const config
+);