1 files changed, 0 insertions, 110 deletions
diff --git a/common/stillness_detector.c b/common/stillness_detector.c
deleted file mode 100644
index c33472aa22..0000000000
--- a/common/stillness_detector.c
+++ /dev/null
@@ -1,110 +0,0 @@
-/* Copyright 2019 The Chromium OS Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "common.h"
-#include "stillness_detector.h"
-#include "timer.h"
-#include <string.h>
-
-static void still_det_reset(struct still_det *still_det)
-{
-	still_det->num_samples = 0;
-	still_det->acc_x = FLOAT_TO_FP(0.0f);
-	still_det->acc_y = FLOAT_TO_FP(0.0f);
-	still_det->acc_z = FLOAT_TO_FP(0.0f);
-	still_det->acc_xx = FLOAT_TO_FP(0.0f);
-	still_det->acc_yy = FLOAT_TO_FP(0.0f);
-	still_det->acc_zz = FLOAT_TO_FP(0.0f);
-}
-
-static bool stillness_batch_complete(struct still_det *still_det,
-				     uint32_t sample_time)
-{
-	bool complete = false;
-	uint32_t batch_window = time_until(still_det->window_start_time,
-					   sample_time);
-
-	/* Checking if enough data is accumulated */
-	if (batch_window >= still_det->min_batch_window &&
-	    still_det->num_samples > still_det->min_batch_size) {
-		if (batch_window <= still_det->max_batch_window) {
-			complete = true;
-		} else {
-			/* Checking for too long batch window, reset and start
-			 * over
-			 */
-			still_det_reset(still_det);
-		}
-	} else if (batch_window > still_det->min_batch_window &&
-		   still_det->num_samples < still_det->min_batch_size) {
-		/* Not enough samples collected, reset and start over */
-		still_det_reset(still_det);
-	}
-	return complete;
-}
-
-static inline fp_t compute_variance(fp_t acc_squared, fp_t acc, fp_t inv)
-{
-	/* (acc^2 - (acc * acc * inv)) * inv */
-	return fp_mul((acc_squared - fp_mul(fp_sq(acc), inv)), inv);
-}
-
-bool still_det_update(struct still_det *still_det, uint32_t sample_time,
-		      fp_t x, fp_t y, fp_t z)
-{
-	fp_t inv = FLOAT_TO_FP(0.0f), var_x, var_y, var_z;
-	bool complete = false;
-
-	/* Accumulate for mean and VAR */
-	still_det->acc_x += x;
-	still_det->acc_y += y;
-	still_det->acc_z += z;
-	still_det->acc_xx += fp_mul(x, x);
-	still_det->acc_yy += fp_mul(y, y);
-	still_det->acc_zz += fp_mul(z, z);
-
-	switch (++still_det->num_samples) {
-	case 0:
-		/* If we rolled over, go back. */
-		still_det->num_samples--;
-		break;
-	case 1:
-		/* Set a new start time if new batch. */
-		still_det->window_start_time = sample_time;
-		break;
-	}
-
-	if (stillness_batch_complete(still_det, sample_time)) {
-		/*
-		 * Compute 1/num_samples and check for num_samples == 0 (should
-		 * never happen, but just in case)
-		 */
-		if (still_det->num_samples) {
-			inv = fp_div(1.0f, INT_TO_FP(still_det->num_samples));
-		} else {
-			still_det_reset(still_det);
-			return complete;
-		}
-		/* Calculating the VAR = sum(x^2)/n - sum(x)^2/n^2 */
-		var_x = compute_variance(
-			still_det->acc_xx, still_det->acc_x, inv);
-		var_y = compute_variance(
-			still_det->acc_yy, still_det->acc_y, inv);
-		var_z = compute_variance(
-			still_det->acc_zz, still_det->acc_z, inv);
-		/* Checking if sensor is still */
-		if (var_x < still_det->var_threshold &&
-		    var_y < still_det->var_threshold &&
-		    var_z < still_det->var_threshold) {
-			still_det->mean_x = fp_mul(still_det->acc_x, inv);
-			still_det->mean_y = fp_mul(still_det->acc_y, inv);
-			still_det->mean_z = fp_mul(still_det->acc_z, inv);
-			complete = true;
-		}
-		/* Reset and start over */
-		still_det_reset(still_det);
-	}
-	return complete;
-}