1 files changed, 30 insertions, 0 deletions

diff --git a/sway/input/libinput.c b/sway/input/libinput.c
index 54520f9e..3c0f359d 100644
--- a/sway/input/libinput.c
+++ b/sway/input/libinput.c
@@ -1,5 +1,6 @@
 #include <float.h>
 #include <libinput.h>
+#include <libudev.h>
 #include <limits.h>
 #include <wlr/backend/libinput.h>
 #include "log.h"
@@ -312,3 +313,32 @@ void sway_input_reset_libinput_device(struct sway_input_device *input_device) {
                 ipc_event_input("libinput_config", input_device);
         }
 }
+
+bool sway_libinput_device_is_builtin(struct sway_input_device *sway_device) {
+        if (!wlr_input_device_is_libinput(sway_device->wlr_device)) {
+                return false;
+        }
+
+        struct libinput_device *device =
+                wlr_libinput_get_device_handle(sway_device->wlr_device);
+        struct udev_device *udev_device =
+                libinput_device_get_udev_device(device);
+        if (!udev_device) {
+                return false;
+        }
+
+        const char *id_path = udev_device_get_property_value(udev_device, "ID_PATH");
+        if (!id_path) {
+                return false;
+        }
+
+        const char prefix_platform[] = "platform-";
+        if (strncmp(id_path, prefix_platform, strlen(prefix_platform)) != 0) {
+                return false;
+        }
+
+        const char prefix_pci[] = "pci-";
+        const char infix_platform[] = "-platform-";
+        return (strncmp(id_path, prefix_pci, strlen(prefix_pci)) == 0) &&
+                strstr(id_path, infix_platform);
+}