2 files changed, 16 insertions, 0 deletions

diff --git a/sway/ipc-json.c b/sway/ipc-json.c
index 7a65be07..87aef47b 100644
--- a/sway/ipc-json.c
+++ b/sway/ipc-json.c
@@ -798,6 +798,18 @@ static json_object *describe_libinput_device(struct libinput_device *device) {
                 json_object_object_add(object, "dwt", json_object_new_string(dwt));
         }
 
+        if (libinput_device_config_calibration_has_matrix(device)) {
+                float matrix[6];
+                libinput_device_config_calibration_get_matrix(device, matrix);
+                struct json_object* array = json_object_new_array();
+                struct json_object* x;
+                for (int i = 0; i < 6; i++) {
+                        x = json_object_new_double(matrix[i]);
+                        json_object_array_add(array, x);
+                }
+                json_object_object_add(object, "calibration_matrix", array);
+        }
+
         return object;
 }
 
diff --git a/sway/sway-ipc.7.scd b/sway/sway-ipc.7.scd
index 8e5bf874..3657dcd6 100644
--- a/sway/sway-ipc.7.scd
+++ b/sway/sway-ipc.7.scd
@@ -1107,6 +1107,10 @@ following properties will be included for devices that support them:
 |- dwt
 :  string
 :  Whether disable-while-typing is enabled. It can be _enabled_ or _disabled_
+|- calibration_matrix
+:  array
+:  An array of 6 floats representing the calibration matrix for absolute
+   devices such as touchscreens
 
 
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