diff --git a/src/xrt/drivers/android/android_sensors.c b/src/xrt/drivers/android/android_sensors.c
index 9678060a9..69e7383e4 100644
--- a/src/xrt/drivers/android/android_sensors.c
+++ b/src/xrt/drivers/android/android_sensors.c
@@ -170,7 +170,7 @@ android_device_destroy(struct xrt_device *xdev)
 	free(android);
 }
 
-static void
+static xrt_result_t
 android_device_get_tracked_pose(struct xrt_device *xdev,
                                 enum xrt_input_name name,
                                 int64_t at_timestamp_ns,
@@ -189,6 +189,7 @@ android_device_get_tracked_pose(struct xrt_device *xdev,
 	                                                              XRT_SPACE_RELATION_POSITION_VALID_BIT);
 
 	*out_relation = new_relation;
+	return XRT_SUCCESS;
 }
 
 
diff --git a/src/xrt/drivers/arduino/arduino_device.c b/src/xrt/drivers/arduino/arduino_device.c
index 7ffdd7349..9ea0bce2c 100644
--- a/src/xrt/drivers/arduino/arduino_device.c
+++ b/src/xrt/drivers/arduino/arduino_device.c
@@ -273,7 +273,7 @@ arduino_run_thread(void *ptr)
  *
  */
 
-static void
+static xrt_result_t
 arduino_get_fusion_pose(struct arduino_device *ad, enum xrt_input_name name, struct xrt_space_relation *out_relation)
 {
 	out_relation->pose.orientation = ad->fusion.rot;
@@ -281,6 +281,8 @@ arduino_get_fusion_pose(struct arduino_device *ad, enum xrt_input_name name, str
 	//! @todo assuming that orientation is actually currently tracked.
 	out_relation->relation_flags = (enum xrt_space_relation_flags)(XRT_SPACE_RELATION_ORIENTATION_VALID_BIT |
 	                                                               XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT);
+
+	return XRT_SUCCESS;
 }
 
 static void
@@ -331,7 +333,7 @@ arduino_device_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 arduino_device_get_tracked_pose(struct xrt_device *xdev,
                                 enum xrt_input_name name,
                                 int64_t at_timestamp_ns,
@@ -340,7 +342,7 @@ arduino_device_get_tracked_pose(struct xrt_device *xdev,
 	struct arduino_device *ad = arduino_device(xdev);
 
 	(void)at_timestamp_ns;
-	arduino_get_fusion_pose(ad, name, out_relation);
+	return arduino_get_fusion_pose(ad, name, out_relation);
 }
 
 
diff --git a/src/xrt/drivers/daydream/daydream_device.c b/src/xrt/drivers/daydream/daydream_device.c
index 696c8e503..b08446936 100644
--- a/src/xrt/drivers/daydream/daydream_device.c
+++ b/src/xrt/drivers/daydream/daydream_device.c
@@ -310,7 +310,7 @@ daydream_device_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 daydream_device_get_tracked_pose(struct xrt_device *xdev,
                                  enum xrt_input_name name,
                                  int64_t at_timestamp_ns,
@@ -320,6 +320,8 @@ daydream_device_get_tracked_pose(struct xrt_device *xdev,
 
 	(void)at_timestamp_ns;
 	daydream_get_fusion_pose(daydream, name, out_relation);
+
+	return XRT_SUCCESS;
 }
 
 
diff --git a/src/xrt/drivers/euroc/euroc_device.c b/src/xrt/drivers/euroc/euroc_device.c
index 91668039e..35d2240c8 100644
--- a/src/xrt/drivers/euroc/euroc_device.c
+++ b/src/xrt/drivers/euroc/euroc_device.c
@@ -102,7 +102,7 @@ euroc_device(struct xrt_device *xdev)
 	return (struct euroc_device *)xdev;
 }
 
-static void
+static xrt_result_t
 euroc_device_get_tracked_pose(struct xrt_device *xdev,
                               enum xrt_input_name name,
                               int64_t at_timestamp_ns,
@@ -128,6 +128,8 @@ euroc_device_get_tracked_pose(struct xrt_device *xdev,
 	out_relation->relation_flags = (enum xrt_space_relation_flags)(
 	    XRT_SPACE_RELATION_ORIENTATION_VALID_BIT | XRT_SPACE_RELATION_POSITION_VALID_BIT |
 	    XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT | XRT_SPACE_RELATION_POSITION_TRACKED_BIT);
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/hdk/hdk_device.cpp b/src/xrt/drivers/hdk/hdk_device.cpp
index 97acdf6e0..c2f1d80b9 100644
--- a/src/xrt/drivers/hdk/hdk_device.cpp
+++ b/src/xrt/drivers/hdk/hdk_device.cpp
@@ -213,7 +213,7 @@ hdk_device_update(struct hdk_device *hd)
 	return 1;
 }
 
-static void
+static xrt_result_t
 hdk_device_get_tracked_pose(struct xrt_device *xdev,
                             enum xrt_input_name name,
                             int64_t requested_timestamp_ns,
@@ -222,8 +222,8 @@ hdk_device_get_tracked_pose(struct xrt_device *xdev,
 	struct hdk_device *hd = hdk_device(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		HDK_ERROR(hd, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&hd->base, hd->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	os_mutex_lock(&hd->lock);
@@ -231,7 +231,7 @@ hdk_device_get_tracked_pose(struct xrt_device *xdev,
 		out_relation->relation_flags = XRT_SPACE_RELATION_BITMASK_NONE;
 		HDK_TRACE(hd, "GET_TRACKED_POSE: No pose");
 		os_mutex_unlock(&hd->lock);
-		return;
+		return XRT_SUCCESS;
 	}
 
 	out_relation->pose.orientation = hd->quat;
@@ -248,6 +248,7 @@ hdk_device_get_tracked_pose(struct xrt_device *xdev,
 
 	HDK_TRACE(hd, "GET_TRACKED_POSE (%f, %f, %f, %f) ANG_VEL (%f, %f, %f)", hd->quat.x, hd->quat.y, hd->quat.z,
 	          hd->quat.w, hd->ang_vel_quat.x, hd->ang_vel_quat.y, hd->ang_vel_quat.z);
+	return XRT_SUCCESS;
 }
 
 static void *
diff --git a/src/xrt/drivers/ht_ctrl_emu/ht_ctrl_emu.cpp b/src/xrt/drivers/ht_ctrl_emu/ht_ctrl_emu.cpp
index 653732d71..72caca8ac 100644
--- a/src/xrt/drivers/ht_ctrl_emu/ht_ctrl_emu.cpp
+++ b/src/xrt/drivers/ht_ctrl_emu/ht_ctrl_emu.cpp
@@ -175,7 +175,7 @@ joint_pose_global(xrt_hand_joint_set *joint_set, xrt_hand_joint joint)
 	return out_relation.pose;
 }
 
-static void
+static xrt_result_t
 do_grip_pose(struct xrt_hand_joint_set *joint_set,
              struct xrt_space_relation *out_relation,
              float grip_offset_from_palm,
@@ -211,11 +211,13 @@ do_grip_pose(struct xrt_hand_joint_set *joint_set,
 	math_quat_from_plus_x_z(&plus_x, &plus_z, &out_relation->pose.orientation);
 
 	out_relation->relation_flags = valid_flags;
+
+	return XRT_SUCCESS;
 }
 
 
 
-static void
+static xrt_result_t
 get_other_two(struct cemu_device *dev,
               int64_t head_timestamp_ns,
               int64_t hand_timestamp_ns,
@@ -223,7 +225,12 @@ get_other_two(struct cemu_device *dev,
               xrt_hand_joint_set *out_secondary)
 {
 	struct xrt_space_relation head_rel;
-	xrt_device_get_tracked_pose(dev->sys->in_head, XRT_INPUT_GENERIC_HEAD_POSE, head_timestamp_ns, &head_rel);
+	xrt_result_t xret =
+	    xrt_device_get_tracked_pose(dev->sys->in_head, XRT_INPUT_GENERIC_HEAD_POSE, head_timestamp_ns, &head_rel);
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
+
 	*out_head = head_rel.pose;
 	int other;
 	if (dev->hand_index == 0) {
@@ -235,11 +242,13 @@ get_other_two(struct cemu_device *dev,
 	int64_t noop;
 	xrt_device_get_hand_tracking(dev->sys->in_hand, dev->sys->out_hand[other]->ht_input_name, hand_timestamp_ns,
 	                             out_secondary, &noop);
+
+	return xret;
 }
 
 // Mostly stolen from
 // https://github.com/maluoi/StereoKit/blob/048b689f71d080a67fde29838c0362a49b88b3d6/StereoKitC/systems/hand/hand_oxr_articulated.cpp#L149
-static void
+static xrt_result_t
 do_aim_pose(struct cemu_device *dev,
             struct xrt_hand_joint_set *joint_set_primary,
             int64_t head_timestamp_ns,
@@ -251,12 +260,14 @@ do_aim_pose(struct cemu_device *dev,
 	struct xrt_hand_joint_set joint_set_secondary;
 #if 0
 	// "Jakob way"
-	get_other_two(dev, hand_timestamp_ns, hand_timestamp_ns, &head, &joint_set_secondary);
+	xrt_result_t xret = get_other_two(dev, hand_timestamp_ns, hand_timestamp_ns, &head, &joint_set_secondary);
 #else
 	// "Moses way"
-	get_other_two(dev, head_timestamp_ns, hand_timestamp_ns, &head, &joint_set_secondary);
+	xrt_result_t xret = get_other_two(dev, head_timestamp_ns, hand_timestamp_ns, &head, &joint_set_secondary);
 #endif
-
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	// Average shoulder width for women:37cm, men:41cm, center of shoulder
 	// joint is around 4cm inwards
@@ -313,10 +324,12 @@ do_aim_pose(struct cemu_device *dev,
 	math_quat_from_plus_x_z(&out_x_vector, &ray_direction, &out_relation->pose.orientation);
 
 	out_relation->relation_flags = valid_flags;
+
+	return xret;
 }
 
 // Pose for controller emulation
-static void
+static xrt_result_t
 cemu_device_get_tracked_pose(struct xrt_device *xdev,
                              enum xrt_input_name name,
                              int64_t at_timestamp_ns,
@@ -326,8 +339,8 @@ cemu_device_get_tracked_pose(struct xrt_device *xdev,
 	struct cemu_system *sys = dev->sys;
 
 	if (name != XRT_INPUT_SIMPLE_GRIP_POSE && name != XRT_INPUT_SIMPLE_AIM_POSE) {
-		CEMU_ERROR(dev, "unknown input name %d for controller pose", name);
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&dev->base, dev->sys->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 	static int64_t hand_timestamp_ns;
 
@@ -337,24 +350,25 @@ cemu_device_get_tracked_pose(struct xrt_device *xdev,
 
 	if (joint_set.is_active == false) {
 		out_relation->relation_flags = XRT_SPACE_RELATION_BITMASK_NONE;
-		return;
+		return XRT_SUCCESS;
 	}
 
-
-
+	xrt_result_t xret = XRT_SUCCESS;
 	switch (name) {
 	case XRT_INPUT_SIMPLE_GRIP_POSE: {
-		do_grip_pose(&joint_set, out_relation, sys->grip_offset_from_palm, dev->hand_index);
+		xret = do_grip_pose(&joint_set, out_relation, sys->grip_offset_from_palm, dev->hand_index);
 		break;
 	}
 	case XRT_INPUT_SIMPLE_AIM_POSE: {
 		// Assume that now we're doing everything in the timestamp from the hand-tracker, so use
 		// hand_timestamp_ns. This will cause the controller to lag behind but otherwise be correct
-		do_aim_pose(dev, &joint_set, at_timestamp_ns, hand_timestamp_ns, out_relation);
+		xret = do_aim_pose(dev, &joint_set, at_timestamp_ns, hand_timestamp_ns, out_relation);
 		break;
 	}
 	default: assert(false);
 	}
+
+	return xret;
 }
 
 static void
diff --git a/src/xrt/drivers/hydra/hydra_driver.c b/src/xrt/drivers/hydra/hydra_driver.c
index e7f11197a..80cefcf38 100644
--- a/src/xrt/drivers/hydra/hydra_driver.c
+++ b/src/xrt/drivers/hydra/hydra_driver.c
@@ -482,7 +482,7 @@ hydra_device_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 hydra_device_get_tracked_pose(struct xrt_device *xdev,
                               enum xrt_input_name name,
                               int64_t at_timestamp_ns,
@@ -505,6 +505,8 @@ hydra_device_get_tracked_pose(struct xrt_device *xdev,
 	// HYDRA_SPEW(hd, "GET_TRACKED_POSE (%f, %f, %f) (%f, %f, %f, %f) ",
 	// pos.x,
 	//            pos.y, pos.z, quat.x, quat.y, quat.z, quat.w);
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/multi_wrapper/multi.c b/src/xrt/drivers/multi_wrapper/multi.c
index ddca26cf2..d28e1e9bd 100644
--- a/src/xrt/drivers/multi_wrapper/multi.c
+++ b/src/xrt/drivers/multi_wrapper/multi.c
@@ -79,7 +79,7 @@ attached_override(struct multi_device *d,
 	m_relation_chain_resolve(&xrc, out_relation);
 }
 
-static void
+static xrt_result_t
 get_tracked_pose(struct xrt_device *xdev,
                  enum xrt_input_name name,
                  int64_t at_timestamp_ns,
@@ -91,7 +91,11 @@ get_tracked_pose(struct xrt_device *xdev,
 
 	struct xrt_space_relation tracker_relation;
 
-	xrt_device_get_tracked_pose(tracker, tracker_input_name, at_timestamp_ns, &tracker_relation);
+	xrt_result_t xret =
+	    xrt_device_get_tracked_pose(tracker, tracker_input_name, at_timestamp_ns, &tracker_relation);
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	switch (d->override_type) {
 	case XRT_TRACKING_OVERRIDE_DIRECT: {
@@ -101,8 +105,10 @@ get_tracked_pose(struct xrt_device *xdev,
 		struct xrt_device *target = d->tracking_override.target;
 
 		struct xrt_space_relation target_relation;
-		xrt_device_get_tracked_pose(target, name, at_timestamp_ns, &target_relation);
-
+		xret = xrt_device_get_tracked_pose(target, name, at_timestamp_ns, &target_relation);
+		if (xret != XRT_SUCCESS) {
+			break;
+		}
 
 		// just use the origin of the tracker space as reference frame
 		struct xrt_space_relation in_target_space;
@@ -116,6 +122,8 @@ get_tracked_pose(struct xrt_device *xdev,
 		                  &in_target_space, out_relation);
 	} break;
 	}
+
+	return xret;
 }
 
 static void
diff --git a/src/xrt/drivers/north_star/ns_hmd.c b/src/xrt/drivers/north_star/ns_hmd.c
index 0f35912ae..12843452e 100644
--- a/src/xrt/drivers/north_star/ns_hmd.c
+++ b/src/xrt/drivers/north_star/ns_hmd.c
@@ -367,7 +367,7 @@ ns_hmd_destroy(struct xrt_device *xdev)
 	u_device_free(&ns->base);
 }
 
-static void
+static xrt_result_t
 ns_hmd_get_tracked_pose(struct xrt_device *xdev,
                         enum xrt_input_name name,
                         int64_t at_timestamp_ns,
@@ -377,11 +377,12 @@ ns_hmd_get_tracked_pose(struct xrt_device *xdev,
 	NS_DEBUG(ns, "Called!");
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		NS_ERROR(ns, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&ns->base, ns->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	*out_relation = ns->no_tracker_relation; // you can change this using the debug gui
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/ohmd/oh_device.c b/src/xrt/drivers/ohmd/oh_device.c
index 471fecd56..00e50a8ab 100644
--- a/src/xrt/drivers/ohmd/oh_device.c
+++ b/src/xrt/drivers/ohmd/oh_device.c
@@ -373,7 +373,7 @@ check_tracker_pose(struct oh_device *ohd, enum xrt_input_name name)
 	return (ohd->ohmd_device_type == OPENHMD_GENERIC_TRACKER) && name == XRT_INPUT_GENERIC_TRACKER_POSE;
 }
 
-static void
+static xrt_result_t
 oh_device_get_tracked_pose(struct xrt_device *xdev,
                            enum xrt_input_name name,
                            int64_t at_timestamp_ns,
@@ -384,8 +384,8 @@ oh_device_get_tracked_pose(struct xrt_device *xdev,
 	struct xrt_vec3 pos = XRT_VEC3_ZERO;
 
 	if (!check_head_pose(ohd, name) && !check_controller_pose(ohd, name) && !check_tracker_pose(ohd, name)) {
-		OHMD_ERROR(ohd, "unknown input name: %d", name);
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&ohd->base, ohd->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	ohmd_ctx_update(ohd->ctx);
@@ -429,7 +429,7 @@ oh_device_get_tracked_pose(struct xrt_device *xdev,
 		 */
 		*out_relation = ohd->last_relation;
 		OHMD_TRACE(ohd, "GET_TRACKED_POSE (%s) - no new data", ohd->base.str);
-		return;
+		return XRT_SUCCESS;
 	}
 
 	/*!
@@ -470,6 +470,8 @@ oh_device_get_tracked_pose(struct xrt_device *xdev,
 	// Update state within driver
 	ohd->last_update = (int64_t)now;
 	ohd->last_relation = *out_relation;
+
+	return XRT_SUCCESS;
 }
 
 
diff --git a/src/xrt/drivers/psmv/psmv_driver.c b/src/xrt/drivers/psmv/psmv_driver.c
index 1c484c944..f67bd289e 100644
--- a/src/xrt/drivers/psmv/psmv_driver.c
+++ b/src/xrt/drivers/psmv/psmv_driver.c
@@ -794,32 +794,6 @@ psmv_get_fusion_pose(struct psmv_device *psmv,
 	    XRT_SPACE_RELATION_ANGULAR_VELOCITY_VALID_BIT | XRT_SPACE_RELATION_LINEAR_VELOCITY_VALID_BIT);
 }
 
-static void
-psmv_push_pose_offset(enum xrt_input_name name, struct xrt_relation_chain *xrc)
-{
-	/*
-	 * Both the grip and aim pose needs adjustments, the grip is a rotated
-	 * body center pose, while the aim pose needs to rotated and translated
-	 * to the tip of the ball.
-	 */
-	if (name != XRT_INPUT_PSMV_AIM_POSE && name != XRT_INPUT_PSMV_GRIP_POSE) {
-		return;
-	}
-
-	float y = 0.0;
-	if (name == XRT_INPUT_PSMV_AIM_POSE) {
-		y += PSMV_BALL_FROM_IMU_Y_M;
-		y += PSMV_BALL_DIAMETER_M / 2.0;
-	}
-
-	struct xrt_pose pose = {
-	    {0.7071068, 0, 0, 0.7071068},
-	    {0, y, 0},
-	};
-
-	m_relation_chain_push_pose(xrc, &pose);
-}
-
 
 /*
  *
@@ -888,16 +862,39 @@ psmv_device_update_inputs(struct xrt_device *xdev)
 }
 
 static xrt_result_t
-psmv_device_get_relation_chain(struct xrt_device *xdev,
-                               enum xrt_input_name name,
-                               uint64_t at_timestamp_ns,
-                               struct xrt_relation_chain *xrc)
+psmv_device_get_tracked_pose(struct xrt_device *xdev,
+                             enum xrt_input_name name,
+                             int64_t at_timestamp_ns,
+                             struct xrt_space_relation *out_relation)
 {
 	struct psmv_device *psmv = psmv_device(xdev);
 
-	psmv_push_pose_offset(name, xrc);
+	if (name != XRT_INPUT_PSMV_AIM_POSE && name != XRT_INPUT_PSMV_GRIP_POSE) {
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&psmv->base, psmv->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
+	}
 
-	struct xrt_space_relation *rel = m_relation_chain_reserve(xrc);
+	/*
+	 * Both the grip and aim pose needs adjustments, the grip is a rotated
+	 * body center pose, while the aim pose needs to rotated and translated
+	 * to the tip of the ball.
+	 */
+
+	float y = 0.0;
+	if (name == XRT_INPUT_PSMV_AIM_POSE) {
+		y += PSMV_BALL_FROM_IMU_Y_M;
+		y += PSMV_BALL_DIAMETER_M / 2.0;
+	}
+
+	struct xrt_pose pose = {
+	    {0.7071068, 0, 0, 0.7071068},
+	    {0, y, 0},
+	};
+
+	struct xrt_relation_chain xrc = {0};
+	m_relation_chain_push_pose(&xrc, &pose);
+
+	struct xrt_space_relation *rel = m_relation_chain_reserve(&xrc);
 
 	if (psmv->ball != NULL) {
 		xrt_tracked_psmv_get_tracked_pose(psmv->ball, name, at_timestamp_ns, rel);
@@ -905,20 +902,9 @@ psmv_device_get_relation_chain(struct xrt_device *xdev,
 		psmv_get_fusion_pose(psmv, name, at_timestamp_ns, rel);
 	}
 
-	return XRT_SUCCESS;
-}
-
-static void
-psmv_device_get_tracked_pose(struct xrt_device *xdev,
-                             enum xrt_input_name name,
-                             int64_t at_timestamp_ns,
-                             struct xrt_space_relation *out_relation)
-{
-	struct xrt_relation_chain xrc = {0};
-
-	psmv_device_get_relation_chain(xdev, name, at_timestamp_ns, &xrc);
-
 	m_relation_chain_resolve(&xrc, out_relation);
+
+	return XRT_SUCCESS;
 }
 
 static float
diff --git a/src/xrt/drivers/pssense/pssense_driver.c b/src/xrt/drivers/pssense/pssense_driver.c
index db4991336..d63b54c2f 100644
--- a/src/xrt/drivers/pssense/pssense_driver.c
+++ b/src/xrt/drivers/pssense/pssense_driver.c
@@ -757,7 +757,7 @@ pssense_get_fusion_pose(struct pssense_device *pssense,
 	    XRT_SPACE_RELATION_ANGULAR_VELOCITY_VALID_BIT | XRT_SPACE_RELATION_LINEAR_VELOCITY_VALID_BIT);
 }
 
-static void
+static xrt_result_t
 pssense_get_tracked_pose(struct xrt_device *xdev,
                          enum xrt_input_name name,
                          int64_t at_timestamp_ns,
@@ -766,8 +766,8 @@ pssense_get_tracked_pose(struct xrt_device *xdev,
 	struct pssense_device *pssense = (struct pssense_device *)xdev;
 
 	if (name != XRT_INPUT_PSSENSE_AIM_POSE && name != XRT_INPUT_PSSENSE_GRIP_POSE) {
-		PSSENSE_ERROR(pssense, "Unknown pose name requested %u", name);
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&pssense->base, pssense->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	struct xrt_relation_chain xrc = {0};
@@ -785,6 +785,8 @@ pssense_get_tracked_pose(struct xrt_device *xdev,
 	os_mutex_unlock(&pssense->lock);
 
 	m_relation_chain_resolve(&xrc, out_relation);
+
+	return XRT_SUCCESS;
 }
 
 static xrt_result_t
diff --git a/src/xrt/drivers/psvr/psvr_device.c b/src/xrt/drivers/psvr/psvr_device.c
index 4485104d4..6b0aa3ee0 100644
--- a/src/xrt/drivers/psvr/psvr_device.c
+++ b/src/xrt/drivers/psvr/psvr_device.c
@@ -957,7 +957,7 @@ psvr_device_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 psvr_device_get_tracked_pose(struct xrt_device *xdev,
                              enum xrt_input_name name,
                              int64_t at_timestamp_ns,
@@ -966,8 +966,8 @@ psvr_device_get_tracked_pose(struct xrt_device *xdev,
 	struct psvr_device *psvr = psvr_device(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		PSVR_ERROR(psvr, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&psvr->base, psvr->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	os_mutex_lock(&psvr->device_mutex);
@@ -993,6 +993,8 @@ psvr_device_get_tracked_pose(struct xrt_device *xdev,
 	//! @todo Move this to the tracker.
 	// Make sure that the orientation is valid.
 	math_quat_normalize(&out_relation->pose.orientation);
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/qwerty/qwerty_device.c b/src/xrt/drivers/qwerty/qwerty_device.c
index 238e12f70..fcaf21e3f 100644
--- a/src/xrt/drivers/qwerty/qwerty_device.c
+++ b/src/xrt/drivers/qwerty/qwerty_device.c
@@ -136,7 +136,7 @@ qwerty_set_output(struct xrt_device *xd, enum xrt_output_name name, const union
 	}
 }
 
-static void
+static xrt_result_t
 qwerty_get_tracked_pose(struct xrt_device *xd,
                         enum xrt_input_name name,
                         int64_t at_timestamp_ns,
@@ -146,8 +146,8 @@ qwerty_get_tracked_pose(struct xrt_device *xd,
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE && name != XRT_INPUT_SIMPLE_GRIP_POSE &&
 	    name != XRT_INPUT_SIMPLE_AIM_POSE) {
-		QWERTY_ERROR(qd, "Unexpected input name = 0x%04X", name >> 8);
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&qd->base, qd->sys->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	// Position
@@ -201,6 +201,8 @@ qwerty_get_tracked_pose(struct xrt_device *xd,
 	out_relation->relation_flags =
 	    XRT_SPACE_RELATION_ORIENTATION_VALID_BIT | XRT_SPACE_RELATION_POSITION_VALID_BIT |
 	    XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT | XRT_SPACE_RELATION_POSITION_TRACKED_BIT;
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/realsense/rs_ddev.c b/src/xrt/drivers/realsense/rs_ddev.c
index 8eab91476..763c7ee8d 100644
--- a/src/xrt/drivers/realsense/rs_ddev.c
+++ b/src/xrt/drivers/realsense/rs_ddev.c
@@ -388,7 +388,7 @@ load_config(struct rs_ddev *rs)
  *
  */
 
-static void
+static xrt_result_t
 rs_ddev_get_tracked_pose(struct xrt_device *xdev,
                          enum xrt_input_name name,
                          int64_t at_timestamp_ns,
@@ -397,11 +397,12 @@ rs_ddev_get_tracked_pose(struct xrt_device *xdev,
 	struct rs_ddev *rs = rs_ddev(xdev);
 
 	if (name != XRT_INPUT_GENERIC_TRACKER_POSE) {
-		U_LOG_E("unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&rs->base, u_log_get_global_level(), name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	m_relation_history_get(rs->relation_hist, at_timestamp_ns, out_relation);
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/realsense/rs_hdev.c b/src/xrt/drivers/realsense/rs_hdev.c
index c43d0b899..f2fc0354f 100644
--- a/src/xrt/drivers/realsense/rs_hdev.c
+++ b/src/xrt/drivers/realsense/rs_hdev.c
@@ -273,7 +273,7 @@ rs_hdev_correct_pose_from_basalt(struct xrt_pose pose)
 	return out_relation.pose;
 }
 
-static void
+static xrt_result_t
 rs_hdev_get_tracked_pose(struct xrt_device *xdev,
                          enum xrt_input_name name,
                          int64_t at_timestamp_ns,
@@ -305,6 +305,8 @@ rs_hdev_get_tracked_pose(struct xrt_device *xdev,
 	out_relation->relation_flags = (enum xrt_space_relation_flags)(
 	    XRT_SPACE_RELATION_ORIENTATION_VALID_BIT | XRT_SPACE_RELATION_POSITION_VALID_BIT |
 	    XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT | XRT_SPACE_RELATION_POSITION_TRACKED_BIT);
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/remote/r_device.c b/src/xrt/drivers/remote/r_device.c
index e19a1cb0d..6a5a5cb91 100644
--- a/src/xrt/drivers/remote/r_device.c
+++ b/src/xrt/drivers/remote/r_device.c
@@ -97,7 +97,7 @@ r_device_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 r_device_get_tracked_pose(struct xrt_device *xdev,
                           enum xrt_input_name name,
                           int64_t at_timestamp_ns,
@@ -108,8 +108,8 @@ r_device_get_tracked_pose(struct xrt_device *xdev,
 
 	if (name != XRT_INPUT_INDEX_AIM_POSE && name != XRT_INPUT_INDEX_GRIP_POSE &&
 	    name != XRT_INPUT_GENERIC_PALM_POSE) {
-		U_LOG_E("Unknown input name: 0x%0x", name);
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&rd->base, u_log_get_global_level(), name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	struct r_remote_controller_data *latest = rd->is_left ? &r->latest.left : &r->latest.right;
@@ -133,6 +133,8 @@ r_device_get_tracked_pose(struct xrt_device *xdev,
 	} else {
 		out_relation->relation_flags = 0;
 	}
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/remote/r_hmd.c b/src/xrt/drivers/remote/r_hmd.c
index 4e220143e..be23acbdc 100644
--- a/src/xrt/drivers/remote/r_hmd.c
+++ b/src/xrt/drivers/remote/r_hmd.c
@@ -56,7 +56,7 @@ r_hmd_destroy(struct xrt_device *xdev)
 	u_device_free(&rh->base);
 }
 
-static void
+static xrt_result_t
 r_hmd_get_tracked_pose(struct xrt_device *xdev,
                        enum xrt_input_name name,
                        int64_t at_timestamp_ns,
@@ -66,8 +66,12 @@ r_hmd_get_tracked_pose(struct xrt_device *xdev,
 
 	switch (name) {
 	case XRT_INPUT_GENERIC_HEAD_POSE: copy_head_center_to_relation(rh, out_relation); break;
-	default: U_LOG_E("Unknown input name"); break;
+	default:
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&rh->base, u_log_get_global_level(), name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/rift_s/rift_s_controller.c b/src/xrt/drivers/rift_s/rift_s_controller.c
index 11459957a..3ccb8fb40 100644
--- a/src/xrt/drivers/rift_s/rift_s_controller.c
+++ b/src/xrt/drivers/rift_s/rift_s_controller.c
@@ -539,7 +539,7 @@ rift_s_controller_get_fusion_pose(struct rift_s_controller *ctrl,
 	    XRT_SPACE_RELATION_ANGULAR_VELOCITY_VALID_BIT | XRT_SPACE_RELATION_LINEAR_VELOCITY_VALID_BIT);
 }
 
-static void
+static xrt_result_t
 rift_s_controller_get_tracked_pose(struct xrt_device *xdev,
                                    enum xrt_input_name name,
                                    int64_t at_timestamp_ns,
@@ -548,8 +548,8 @@ rift_s_controller_get_tracked_pose(struct xrt_device *xdev,
 	struct rift_s_controller *ctrl = (struct rift_s_controller *)(xdev);
 
 	if (name != XRT_INPUT_TOUCH_AIM_POSE && name != XRT_INPUT_TOUCH_GRIP_POSE) {
-		RIFT_S_ERROR("unknown pose name requested");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&ctrl->base, rift_s_log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	struct xrt_relation_chain xrc = {0};
@@ -571,6 +571,8 @@ rift_s_controller_get_tracked_pose(struct xrt_device *xdev,
 	os_mutex_unlock(&ctrl->mutex);
 
 	m_relation_chain_resolve(&xrc, out_relation);
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/rift_s/rift_s_hmd.c b/src/xrt/drivers/rift_s/rift_s_hmd.c
index de60d7588..7fb37b1e6 100644
--- a/src/xrt/drivers/rift_s/rift_s_hmd.c
+++ b/src/xrt/drivers/rift_s/rift_s_hmd.c
@@ -43,7 +43,7 @@
 #define DEG_TO_RAD(D) ((D)*M_PI / 180.)
 
 
-static void
+static xrt_result_t
 rift_s_get_tracked_pose(struct xrt_device *xdev,
                         enum xrt_input_name name,
                         int64_t at_timestamp_ns,
@@ -52,13 +52,14 @@ rift_s_get_tracked_pose(struct xrt_device *xdev,
 	struct rift_s_hmd *hmd = (struct rift_s_hmd *)(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		RIFT_S_ERROR("Unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&hmd->base, rift_s_log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	U_ZERO(out_relation);
 
 	rift_s_tracker_get_tracked_pose(hmd->tracker, RIFT_S_TRACKER_POSE_DEVICE, at_timestamp_ns, out_relation);
+	return XRT_SUCCESS;
 }
 
 void
diff --git a/src/xrt/drivers/rift_s/rift_s_tracker.c b/src/xrt/drivers/rift_s/rift_s_tracker.c
index 532313fc5..c21d55ed9 100644
--- a/src/xrt/drivers/rift_s/rift_s_tracker.c
+++ b/src/xrt/drivers/rift_s/rift_s_tracker.c
@@ -67,7 +67,7 @@ DEBUG_GET_ONCE_BOOL_OPTION(rift_s_slam, "RIFT_S_SLAM", true)
 //! Specifies whether the user wants to use the hand tracker.
 DEBUG_GET_ONCE_BOOL_OPTION(rift_s_handtracking, "RIFT_S_HANDTRACKING", true)
 
-static void
+static xrt_result_t
 rift_s_tracker_get_tracked_pose_imu(struct xrt_device *xdev,
                                     enum xrt_input_name name,
                                     int64_t at_timestamp_ns,
@@ -608,16 +608,21 @@ rift_s_tracker_correct_pose_from_basalt(struct xrt_pose *pose)
 	math_quat_rotate_vec3(&q, &pose->position, &pose->position);
 }
 
-static void
+static xrt_result_t
 rift_s_tracker_get_tracked_pose_imu(struct xrt_device *xdev,
                                     enum xrt_input_name name,
                                     int64_t at_timestamp_ns,
                                     struct xrt_space_relation *out_relation)
 {
 	struct rift_s_tracker *tracker = (struct rift_s_tracker *)(xdev);
-	assert(name == XRT_INPUT_GENERIC_TRACKER_POSE);
+	if (name != XRT_INPUT_GENERIC_TRACKER_POSE) {
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&tracker->base, rift_s_log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
+	}
 
 	rift_s_tracker_get_tracked_pose(tracker, RIFT_S_TRACKER_POSE_IMU, at_timestamp_ns, out_relation);
+
+	return XRT_SUCCESS;
 }
 
 void
diff --git a/src/xrt/drivers/rokid/rokid_hmd.c b/src/xrt/drivers/rokid/rokid_hmd.c
index e28368751..ceb50dd5c 100644
--- a/src/xrt/drivers/rokid/rokid_hmd.c
+++ b/src/xrt/drivers/rokid/rokid_hmd.c
@@ -430,7 +430,7 @@ rokid_hmd_destroy(struct xrt_device *xdev)
 	u_device_free(&rokid->base);
 }
 
-static void
+static xrt_result_t
 rokid_hmd_get_tracked_pose(struct xrt_device *xdev,
                            enum xrt_input_name name,
                            int64_t at_timestamp_ns,
@@ -439,12 +439,14 @@ rokid_hmd_get_tracked_pose(struct xrt_device *xdev,
 	struct rokid_hmd *rokid = rokid_hmd(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		ROKID_ERROR(rokid, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&rokid->base, rokid->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 	os_mutex_lock(&rokid->fusion.mutex);
 	rokid_fusion_get_pose(&rokid->fusion, at_timestamp_ns, out_relation);
 	os_mutex_unlock(&rokid->fusion.mutex);
+
+	return XRT_SUCCESS;
 }
 
 static struct xrt_device *
diff --git a/src/xrt/drivers/sample/sample_hmd.c b/src/xrt/drivers/sample/sample_hmd.c
index e09e0e1c0..e56ef28bb 100644
--- a/src/xrt/drivers/sample/sample_hmd.c
+++ b/src/xrt/drivers/sample/sample_hmd.c
@@ -96,7 +96,7 @@ sample_hmd_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 sample_hmd_get_tracked_pose(struct xrt_device *xdev,
                             enum xrt_input_name name,
                             int64_t at_timestamp_ns,
@@ -105,8 +105,8 @@ sample_hmd_get_tracked_pose(struct xrt_device *xdev,
 	struct sample_hmd *hmd = sample_hmd(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		HMD_ERROR(hmd, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&hmd->base, hmd->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	struct xrt_space_relation relation = XRT_SPACE_RELATION_ZERO;
@@ -125,6 +125,7 @@ sample_hmd_get_tracked_pose(struct xrt_device *xdev,
 	}
 
 	*out_relation = relation;
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/simula/svr_hmd.c b/src/xrt/drivers/simula/svr_hmd.c
index 103b34ad6..8e130d0b6 100644
--- a/src/xrt/drivers/simula/svr_hmd.c
+++ b/src/xrt/drivers/simula/svr_hmd.c
@@ -72,7 +72,7 @@ svr_hmd_destroy(struct xrt_device *xdev)
 	u_device_free(&ns->base);
 }
 
-static void
+static xrt_result_t
 svr_hmd_get_tracked_pose(struct xrt_device *xdev,
                          enum xrt_input_name name,
                          int64_t at_timestamp_ns,
@@ -82,7 +82,8 @@ svr_hmd_get_tracked_pose(struct xrt_device *xdev,
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
 		SVR_ERROR(ns, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&ns->base, ns->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 
@@ -92,6 +93,8 @@ svr_hmd_get_tracked_pose(struct xrt_device *xdev,
 	    (struct xrt_pose)XRT_POSE_IDENTITY; // This is so that tracking overrides/multi driver just transforms us by
 	                                        // the tracker + offset from the tracker.
 	out_relation->relation_flags = XRT_SPACE_RELATION_BITMASK_ALL;
+
+	return XRT_SUCCESS;
 }
 
 #define DEG_TO_RAD(DEG) (DEG * M_PI / 180.)
diff --git a/src/xrt/drivers/simulated/simulated_controller.c b/src/xrt/drivers/simulated/simulated_controller.c
index d76a9fe21..2a164e6fd 100644
--- a/src/xrt/drivers/simulated/simulated_controller.c
+++ b/src/xrt/drivers/simulated/simulated_controller.c
@@ -46,8 +46,8 @@ struct simulated_device
 #define CHECK_THAT_NAME_IS_AND_ERROR(NAME)                                                                             \
 	do {                                                                                                           \
 		if (sd->base.name != NAME) {                                                                           \
-			U_LOG_E("Unknown input for controller %s 0x%02x", #NAME, name);                                \
-			return;                                                                                        \
+			U_LOG_XDEV_UNSUPPORTED_INPUT(&sd->base, u_log_get_global_level(), name);                       \
+			return XRT_ERROR_INPUT_UNSUPPORTED;                                                            \
 		}                                                                                                      \
 	} while (false)
 
@@ -118,7 +118,7 @@ simulated_device_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 simulated_device_get_tracked_pose(struct xrt_device *xdev,
                                   enum xrt_input_name name,
                                   int64_t at_timestamp_ns,
@@ -133,13 +133,15 @@ simulated_device_get_tracked_pose(struct xrt_device *xdev,
 	case XRT_INPUT_WMR_AIM_POSE: CHECK_THAT_NAME_IS_AND_ERROR(XRT_DEVICE_WMR_CONTROLLER); break;
 	case XRT_INPUT_ML2_CONTROLLER_GRIP_POSE:
 	case XRT_INPUT_ML2_CONTROLLER_AIM_POSE: CHECK_THAT_NAME_IS_AND_ERROR(XRT_DEVICE_ML2_CONTROLLER); break;
-	default: U_LOG_E("Unknown input name: 0x%0x", name); return;
+	default:
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&sd->base, u_log_get_global_level(), name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	if (!sd->active) {
 		out_relation->pose = (struct xrt_pose)XRT_POSE_IDENTITY;
 		out_relation->relation_flags = 0;
-		return;
+		return XRT_SUCCESS;
 	}
 
 	struct xrt_pose pose = sd->center;
@@ -160,6 +162,8 @@ simulated_device_get_tracked_pose(struct xrt_device *xdev,
 	    XRT_SPACE_RELATION_ORIENTATION_VALID_BIT | XRT_SPACE_RELATION_POSITION_VALID_BIT |
 	    XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT | XRT_SPACE_RELATION_POSITION_TRACKED_BIT |
 	    XRT_SPACE_RELATION_LINEAR_VELOCITY_VALID_BIT | XRT_SPACE_RELATION_ANGULAR_VELOCITY_VALID_BIT);
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/simulated/simulated_hmd.c b/src/xrt/drivers/simulated/simulated_hmd.c
index 81d6ecf49..34223cd4f 100644
--- a/src/xrt/drivers/simulated/simulated_hmd.c
+++ b/src/xrt/drivers/simulated/simulated_hmd.c
@@ -85,7 +85,7 @@ simulated_hmd_destroy(struct xrt_device *xdev)
 	u_device_free(&dh->base);
 }
 
-static void
+static xrt_result_t
 simulated_hmd_get_tracked_pose(struct xrt_device *xdev,
                                enum xrt_input_name name,
                                int64_t at_timestamp_ns,
@@ -94,8 +94,8 @@ simulated_hmd_get_tracked_pose(struct xrt_device *xdev,
 	struct simulated_hmd *hmd = simulated_hmd(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		HMD_ERROR(hmd, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&hmd->base, hmd->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	const double time_s = time_ns_to_s(at_timestamp_ns - hmd->created_ns);
@@ -142,6 +142,8 @@ simulated_hmd_get_tracked_pose(struct xrt_device *xdev,
 	out_relation->relation_flags = (enum xrt_space_relation_flags)(XRT_SPACE_RELATION_ORIENTATION_VALID_BIT |
 	                                                               XRT_SPACE_RELATION_POSITION_VALID_BIT |
 	                                                               XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT);
+
+	return XRT_SUCCESS;
 }
 
 static xrt_result_t
diff --git a/src/xrt/drivers/steamvr_lh/device.cpp b/src/xrt/drivers/steamvr_lh/device.cpp
index 53406734e..cfea43b1f 100644
--- a/src/xrt/drivers/steamvr_lh/device.cpp
+++ b/src/xrt/drivers/steamvr_lh/device.cpp
@@ -426,16 +426,18 @@ Device::get_battery_status(bool *out_present, bool *out_charging, float *out_cha
 	return XRT_SUCCESS;
 }
 
-void
+xrt_result_t
 HmdDevice::get_tracked_pose(xrt_input_name name, uint64_t at_timestamp_ns, xrt_space_relation *out_relation)
 {
 	switch (name) {
 	case XRT_INPUT_GENERIC_HEAD_POSE: Device::get_pose(at_timestamp_ns, out_relation); break;
-	default: U_LOG_W("steamvr_lh hmd: Requested pose for unknown name %u", name); break;
+	default: U_LOG_XDEV_UNSUPPORTED_INPUT(this, ctx->log_level, name); return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
+
+	return XRT_SUCCESS;
 }
 
-void
+xrt_result_t
 ControllerDevice::get_tracked_pose(xrt_input_name name, uint64_t at_timestamp_ns, xrt_space_relation *out_relation)
 {
 	xrt_space_relation rel = {};
@@ -453,6 +455,8 @@ ControllerDevice::get_tracked_pose(xrt_input_name name, uint64_t at_timestamp_ns
 	struct xrt_pose *p = &out_relation->pose;
 	DEV_DEBUG("controller %u: GET_POSITION (%f %f %f) GET_ORIENTATION (%f, %f, %f, %f)", name, p->position.x,
 	          p->position.y, p->position.z, p->orientation.x, p->orientation.y, p->orientation.z, p->orientation.w);
+
+	return XRT_SUCCESS;
 }
 
 void
diff --git a/src/xrt/drivers/steamvr_lh/device.hpp b/src/xrt/drivers/steamvr_lh/device.hpp
index 60efc1b57..6bd3de993 100644
--- a/src/xrt/drivers/steamvr_lh/device.hpp
+++ b/src/xrt/drivers/steamvr_lh/device.hpp
@@ -69,7 +69,7 @@ public:
 	handle_properties(const vr::PropertyWrite_t *batch, uint32_t count);
 
 	//! Maps to @ref xrt_device::get_tracked_pose.
-	virtual void
+	virtual xrt_result_t
 	get_tracked_pose(xrt_input_name name, uint64_t at_timestamp_ns, xrt_space_relation *out_relation) = 0;
 
 	xrt_result_t
@@ -116,7 +116,7 @@ public:
 
 	HmdDevice(const DeviceBuilder &builder);
 
-	void
+	xrt_result_t
 	get_tracked_pose(xrt_input_name name, uint64_t at_timestamp_ns, xrt_space_relation *out_relation) override;
 
 	void
@@ -168,7 +168,7 @@ public:
 	void
 	set_haptic_handle(vr::VRInputComponentHandle_t handle);
 
-	void
+	xrt_result_t
 	get_tracked_pose(xrt_input_name name, uint64_t at_timestamp_ns, xrt_space_relation *out_relation) override;
 
 	IndexFingerInput *
diff --git a/src/xrt/drivers/survive/survive_driver.c b/src/xrt/drivers/survive/survive_driver.c
index 95034d573..6595a0818 100644
--- a/src/xrt/drivers/survive/survive_driver.c
+++ b/src/xrt/drivers/survive/survive_driver.c
@@ -324,7 +324,7 @@ verify_device_name(struct survive_device *survive, enum xrt_input_name name)
 	return false;
 }
 
-static void
+static xrt_result_t
 survive_device_get_tracked_pose(struct xrt_device *xdev,
                                 enum xrt_input_name name,
                                 int64_t at_timestamp_ns,
@@ -332,13 +332,13 @@ survive_device_get_tracked_pose(struct xrt_device *xdev,
 {
 	struct survive_device *survive = (struct survive_device *)xdev;
 	if (!verify_device_name(survive, name)) {
-		SURVIVE_ERROR(survive, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&survive->base, survive->sys->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	if (!survive->survive_obj) {
 		// U_LOG_D("Obj not set for %p", (void*)survive);
-		return;
+		return XRT_SUCCESS;
 	}
 
 	// We're pretty sure libsurvive is giving us the IMU pose here, so this works.
@@ -356,6 +356,7 @@ survive_device_get_tracked_pose(struct xrt_device *xdev,
 	struct xrt_pose *p = &out_relation->pose;
 	SURVIVE_TRACE(survive, "GET_POSITION (%f %f %f) GET_ORIENTATION (%f, %f, %f, %f)", p->position.x, p->position.y,
 	              p->position.z, p->orientation.x, p->orientation.y, p->orientation.z, p->orientation.w);
+	return XRT_SUCCESS;
 }
 
 static xrt_result_t
diff --git a/src/xrt/drivers/twrap/twrap_slam.c b/src/xrt/drivers/twrap/twrap_slam.c
index 6cf1c23c0..4e4581178 100644
--- a/src/xrt/drivers/twrap/twrap_slam.c
+++ b/src/xrt/drivers/twrap/twrap_slam.c
@@ -84,7 +84,7 @@ twrap_hmd_correct_pose_from_basalt(struct xrt_pose pose)
 }
 #endif
 
-static void
+static xrt_result_t
 twrap_slam_get_tracked_pose(struct xrt_device *xdev,
                             enum xrt_input_name name,
                             int64_t at_timestamp_ns,
@@ -93,8 +93,8 @@ twrap_slam_get_tracked_pose(struct xrt_device *xdev,
 	struct slam_device *dx = slam_device(xdev);
 
 	if (name != XRT_INPUT_GENERIC_TRACKER_POSE) {
-		SLAM_ERROR(dx, "unknown input name %d", name);
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&dx->base, dx->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 #ifdef XRT_FEATURE_SLAM
 	if (!dx->use_3dof) {
@@ -109,7 +109,7 @@ twrap_slam_get_tracked_pose(struct xrt_device *xdev,
 
 		if (!pose_tracked) {
 			U_ZERO(&out_relation->relation_flags);
-			return;
+			return XRT_SUCCESS;
 		}
 
 		basalt_rel.pose = twrap_hmd_correct_pose_from_basalt(basalt_rel.pose);
@@ -127,11 +127,12 @@ twrap_slam_get_tracked_pose(struct xrt_device *xdev,
 		}
 
 		m_relation_chain_resolve(&xrc, out_relation);
-		return;
+		return XRT_SUCCESS;
 	}
 
 #endif
 	m_relation_history_get(dx->dof3->rh, at_timestamp_ns, out_relation);
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/vive/vive_controller.c b/src/xrt/drivers/vive/vive_controller.c
index a871605ee..590ae6d87 100644
--- a/src/xrt/drivers/vive/vive_controller.c
+++ b/src/xrt/drivers/vive/vive_controller.c
@@ -410,7 +410,7 @@ vive_controller_get_hand_tracking(struct xrt_device *xdev,
 	out_value->is_active = true;
 }
 
-static void
+static xrt_result_t
 vive_controller_device_get_tracked_pose(struct xrt_device *xdev,
                                         enum xrt_input_name name,
                                         int64_t at_timestamp_ns,
@@ -421,11 +421,13 @@ vive_controller_device_get_tracked_pose(struct xrt_device *xdev,
 	// U_LOG_D("input name %d %d", name, XRT_INPUT_VIVE_GRIP_POSE);
 	if (name != XRT_INPUT_VIVE_AIM_POSE && name != XRT_INPUT_VIVE_GRIP_POSE && name != XRT_INPUT_INDEX_AIM_POSE &&
 	    name != XRT_INPUT_INDEX_GRIP_POSE) {
-		VIVE_ERROR(d, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&d->base, d->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	get_pose(d, name, at_timestamp_ns, out_relation);
+
+	return XRT_SUCCESS;
 }
 
 static int
diff --git a/src/xrt/drivers/vive/vive_device.c b/src/xrt/drivers/vive/vive_device.c
index 7b1dcddbe..05ad7493f 100644
--- a/src/xrt/drivers/vive/vive_device.c
+++ b/src/xrt/drivers/vive/vive_device.c
@@ -106,7 +106,7 @@ vive_device_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 vive_device_get_3dof_tracked_pose(struct xrt_device *xdev,
                                   enum xrt_input_name name,
                                   uint64_t at_timestamp_ns,
@@ -117,8 +117,8 @@ vive_device_get_3dof_tracked_pose(struct xrt_device *xdev,
 	struct vive_device *d = vive_device(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		U_LOG_E("unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&d->base, u_log_get_global_level(), name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	struct xrt_space_relation relation = {0};
@@ -131,6 +131,8 @@ vive_device_get_3dof_tracked_pose(struct xrt_device *xdev,
 
 	*out_relation = relation;
 	d->pose = out_relation->pose;
+
+	return XRT_SUCCESS;
 }
 
 //! Specific pose corrections for Basalt and a Valve Index headset
@@ -179,7 +181,7 @@ vive_device_get_slam_tracked_pose(struct xrt_device *xdev,
 	    XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT | XRT_SPACE_RELATION_POSITION_TRACKED_BIT);
 }
 
-static void
+static xrt_result_t
 vive_device_get_tracked_pose(struct xrt_device *xdev,
                              enum xrt_input_name name,
                              int64_t at_timestamp_ns,
@@ -192,12 +194,18 @@ vive_device_get_tracked_pose(struct xrt_device *xdev,
 	// Ajdust the timestamp with the offset.
 	at_timestamp_ns += (int64_t)(d->tracked_offset_ms.val * (double)U_TIME_1MS_IN_NS);
 
+	xrt_result_t xret = XRT_SUCCESS;
 	if (d->tracking.slam_enabled && d->slam_over_3dof) {
 		vive_device_get_slam_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
 	} else {
-		vive_device_get_3dof_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
+		xret = vive_device_get_3dof_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
 	}
-	math_pose_transform(&d->offset, &out_relation->pose, &out_relation->pose);
+
+	if (xret == XRT_SUCCESS) {
+		math_pose_transform(&d->offset, &out_relation->pose, &out_relation->pose);
+	}
+
+	return xret;
 }
 
 static void
diff --git a/src/xrt/drivers/wmr/wmr_controller_base.c b/src/xrt/drivers/wmr/wmr_controller_base.c
index 5520611cc..164cbfea7 100644
--- a/src/xrt/drivers/wmr/wmr_controller_base.c
+++ b/src/xrt/drivers/wmr/wmr_controller_base.c
@@ -443,7 +443,7 @@ read_controller_config(struct wmr_controller_base *wcb)
 	return true;
 }
 
-static void
+static xrt_result_t
 wmr_controller_base_get_tracked_pose(struct xrt_device *xdev,
                                      enum xrt_input_name name,
                                      int64_t at_timestamp_ns,
@@ -479,13 +479,15 @@ wmr_controller_base_get_tracked_pose(struct xrt_device *xdev,
 	// No prediction needed.
 	if (at_timestamp_ns < last_imu_timestamp_ns) {
 		*out_relation = relation;
-		return;
+		return XRT_SUCCESS;
 	}
 
 	int64_t prediction_ns = at_timestamp_ns - last_imu_timestamp_ns;
 	double prediction_s = time_ns_to_s(prediction_ns);
 
 	m_predict_relation(&relation, prediction_s, out_relation);
+
+	return XRT_SUCCESS;
 }
 
 void
diff --git a/src/xrt/drivers/wmr/wmr_hmd.c b/src/xrt/drivers/wmr/wmr_hmd.c
index 59bd5b819..f190e8c77 100644
--- a/src/xrt/drivers/wmr/wmr_hmd.c
+++ b/src/xrt/drivers/wmr/wmr_hmd.c
@@ -1073,7 +1073,7 @@ wmr_read_config(struct wmr_hmd *wh)
  *
  */
 
-static void
+static xrt_result_t
 wmr_hmd_get_3dof_tracked_pose(struct xrt_device *xdev,
                               enum xrt_input_name name,
                               uint64_t at_timestamp_ns,
@@ -1084,8 +1084,8 @@ wmr_hmd_get_3dof_tracked_pose(struct xrt_device *xdev,
 	struct wmr_hmd *wh = wmr_hmd(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		WMR_ERROR(wh, "Unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&wh->base, wh->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	// Variables needed for prediction.
@@ -1105,7 +1105,7 @@ wmr_hmd_get_3dof_tracked_pose(struct xrt_device *xdev,
 	// No prediction needed.
 	if (at_timestamp_ns < last_imu_timestamp_ns) {
 		*out_relation = relation;
-		return;
+		return XRT_SUCCESS;
 	}
 
 	uint64_t prediction_ns = at_timestamp_ns - last_imu_timestamp_ns;
@@ -1113,6 +1113,8 @@ wmr_hmd_get_3dof_tracked_pose(struct xrt_device *xdev,
 
 	m_predict_relation(&relation, prediction_s, out_relation);
 	wh->pose = out_relation->pose;
+
+	return XRT_SUCCESS;
 }
 
 //! Specific pose corrections for Basalt and a WMR headset
@@ -1165,7 +1167,7 @@ wmr_hmd_get_slam_tracked_pose(struct xrt_device *xdev,
 	    XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT | XRT_SPACE_RELATION_POSITION_TRACKED_BIT);
 }
 
-static void
+static xrt_result_t
 wmr_hmd_get_tracked_pose(struct xrt_device *xdev,
                          enum xrt_input_name name,
                          int64_t at_timestamp_ns,
@@ -1177,12 +1179,18 @@ wmr_hmd_get_tracked_pose(struct xrt_device *xdev,
 
 	at_timestamp_ns += (int64_t)(wh->tracked_offset_ms.val * (double)U_TIME_1MS_IN_NS);
 
+	xrt_result_t xret = XRT_SUCCESS;
 	if (wh->tracking.slam_enabled && wh->slam_over_3dof) {
 		wmr_hmd_get_slam_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
 	} else {
-		wmr_hmd_get_3dof_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
+		xret = wmr_hmd_get_3dof_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
 	}
-	math_pose_transform(&wh->offset, &out_relation->pose, &out_relation->pose);
+
+	if (xret == XRT_SUCCESS) {
+		math_pose_transform(&wh->offset, &out_relation->pose, &out_relation->pose);
+	}
+
+	return xret;
 }
 
 static void
diff --git a/src/xrt/drivers/xreal_air/xreal_air_hmd.c b/src/xrt/drivers/xreal_air/xreal_air_hmd.c
index 800164998..a9e0cde33 100644
--- a/src/xrt/drivers/xreal_air/xreal_air_hmd.c
+++ b/src/xrt/drivers/xreal_air/xreal_air_hmd.c
@@ -1049,7 +1049,7 @@ xreal_air_hmd_update_inputs(struct xrt_device *xdev)
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 xreal_air_hmd_get_tracked_pose(struct xrt_device *xdev,
                                enum xrt_input_name name,
                                int64_t at_timestamp_ns,
@@ -1058,8 +1058,8 @@ xreal_air_hmd_get_tracked_pose(struct xrt_device *xdev,
 	struct xreal_air_hmd *hmd = xreal_air_hmd(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		XREAL_AIR_ERROR(hmd, "unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&hmd->base, hmd->log_level, name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	const enum xrt_space_relation_flags flags = (enum xrt_space_relation_flags)(
@@ -1076,6 +1076,7 @@ xreal_air_hmd_get_tracked_pose(struct xrt_device *xdev,
 
 	// Make sure that the orientation is valid.
 	math_quat_normalize(&out_relation->pose.orientation);
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/include/xrt/xrt_device.h b/src/xrt/include/xrt/xrt_device.h
index bee4789a7..4d9a5bebd 100644
--- a/src/xrt/include/xrt/xrt_device.h
+++ b/src/xrt/include/xrt/xrt_device.h
@@ -319,10 +319,10 @@ struct xrt_device
 	 *
 	 * @see xrt_input_name
 	 */
-	void (*get_tracked_pose)(struct xrt_device *xdev,
-	                         enum xrt_input_name name,
-	                         int64_t at_timestamp_ns,
-	                         struct xrt_space_relation *out_relation);
+	xrt_result_t (*get_tracked_pose)(struct xrt_device *xdev,
+	                                 enum xrt_input_name name,
+	                                 int64_t at_timestamp_ns,
+	                                 struct xrt_space_relation *out_relation);
 
 	/*!
 	 * @brief Get relationship of hand joints to the tracking origin space as
@@ -580,8 +580,7 @@ xrt_device_get_tracked_pose(struct xrt_device *xdev,
                             int64_t at_timestamp_ns,
                             struct xrt_space_relation *out_relation)
 {
-	xdev->get_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
-	return XRT_SUCCESS;
+	return xdev->get_tracked_pose(xdev, name, at_timestamp_ns, out_relation);
 }
 
 /*!
diff --git a/src/xrt/ipc/client/ipc_client_device.c b/src/xrt/ipc/client/ipc_client_device.c
index 777faa0ad..c6bac7b39 100644
--- a/src/xrt/ipc/client/ipc_client_device.c
+++ b/src/xrt/ipc/client/ipc_client_device.c
@@ -82,7 +82,7 @@ ipc_client_device_update_inputs(struct xrt_device *xdev)
 	IPC_CHK_ALWAYS_RET(icd->ipc_c, xret, "ipc_call_device_update_input");
 }
 
-static void
+static xrt_result_t
 ipc_client_device_get_tracked_pose(struct xrt_device *xdev,
                                    enum xrt_input_name name,
                                    int64_t at_timestamp_ns,
@@ -96,7 +96,7 @@ ipc_client_device_get_tracked_pose(struct xrt_device *xdev,
 	    name,                                             //
 	    at_timestamp_ns,                                  //
 	    out_relation);                                    //
-	IPC_CHK_ONLY_PRINT(icd->ipc_c, xret, "ipc_call_device_get_tracked_pose");
+	IPC_CHK_ALWAYS_RET(icd->ipc_c, xret, "ipc_call_device_get_tracked_pose");
 }
 
 static void
diff --git a/src/xrt/ipc/client/ipc_client_hmd.c b/src/xrt/ipc/client/ipc_client_hmd.c
index 7fa921dcd..f4639e144 100644
--- a/src/xrt/ipc/client/ipc_client_hmd.c
+++ b/src/xrt/ipc/client/ipc_client_hmd.c
@@ -149,7 +149,7 @@ ipc_client_hmd_update_inputs(struct xrt_device *xdev)
 	IPC_CHK_ALWAYS_RET(ich->ipc_c, xret, "ipc_call_device_update_input");
 }
 
-static void
+static xrt_result_t
 ipc_client_hmd_get_tracked_pose(struct xrt_device *xdev,
                                 enum xrt_input_name name,
                                 int64_t at_timestamp_ns,
@@ -164,7 +164,7 @@ ipc_client_hmd_get_tracked_pose(struct xrt_device *xdev,
 	    name,                                //
 	    at_timestamp_ns,                     //
 	    out_relation);                       //
-	IPC_CHK_ONLY_PRINT(ich->ipc_c, xret, "ipc_call_device_get_tracked_pose");
+	IPC_CHK_ALWAYS_RET(ich->ipc_c, xret, "ipc_call_device_get_tracked_pose");
 }
 
 static void
diff --git a/src/xrt/targets/sdl_test/sdl_device.c b/src/xrt/targets/sdl_test/sdl_device.c
index 89cd5f10a..674d838be 100644
--- a/src/xrt/targets/sdl_test/sdl_device.c
+++ b/src/xrt/targets/sdl_test/sdl_device.c
@@ -14,7 +14,7 @@
 #include "util/u_distortion_mesh.h"
 
 
-static void
+static xrt_result_t
 sdl_hmd_get_tracked_pose(struct xrt_device *xdev,
                          enum xrt_input_name name,
                          int64_t at_timestamp_ns,
@@ -23,8 +23,8 @@ sdl_hmd_get_tracked_pose(struct xrt_device *xdev,
 	struct sdl_program *sp = from_xdev(xdev);
 
 	if (name != XRT_INPUT_GENERIC_HEAD_POSE) {
-		U_LOG_E("Unknown input name");
-		return;
+		U_LOG_XDEV_UNSUPPORTED_INPUT(&sp->xdev_base, u_log_get_global_level(), name);
+		return XRT_ERROR_INPUT_UNSUPPORTED;
 	}
 
 	struct xrt_space_relation relation = XRT_SPACE_RELATION_ZERO;
@@ -37,6 +37,8 @@ sdl_hmd_get_tracked_pose(struct xrt_device *xdev,
 	    XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT; //
 
 	*out_relation = relation;
+
+	return XRT_SUCCESS;
 }
 
 static void