1 files changed, 32 insertions, 0 deletions
diff --git a/rcm-server-evdev.c b/rcm-server-evdev.c
index 9423806..bc8361e 100644
--- a/rcm-server-evdev.c
+++ b/rcm-server-evdev.c
@@ -33,6 +33,38 @@ struct rc_keymap_entry {
 };
 #define RKE_SIZE (sizeof(struct rc_scancode))
 
+const char *
+evdev_guess_protocol(struct device *device, uint64_t scancode, uint32_t keycode)
+{
+	struct rc_keymap_entry rke;
+	unsigned i;
+
+	if (!device || device->evdev_fd < 0)
+		return NULL;
+
+	for (i = 0; ; i++) {
+		memset(&rke, 0, sizeof(rke));
+		rke.len = RKE_SIZE;
+		rke.index = i;
+		rke.flags = INPUT_KEYMAP_BY_INDEX;
+		if (ioctl(device->evdev_fd, EVIOCGKEYCODE_V2, &rke))
+			break;
+
+		if (rke.u.rc.scancode != scancode)
+			continue;
+
+		if (rke.keycode != keycode)
+			continue;
+
+		if (rke.u.rc.protocol > ARRAY_SIZE(rc_protocols))
+			return NULL;
+
+		return rc_protocols[rke.u.rc.protocol];
+	}
+
+	return NULL;
+}
+
 static int
 evdev_clear_keymap(struct device *device)
 {