1 files changed, 0 insertions, 154 deletions
diff --git a/drivers/misc/echo/fir.h b/drivers/misc/echo/fir.h
deleted file mode 100644
index 4d0821025223..000000000000
--- a/drivers/misc/echo/fir.h
+++ /dev/null
@@ -1,154 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * SpanDSP - a series of DSP components for telephony
- *
- * fir.h - General telephony FIR routines
- *
- * Written by Steve Underwood <steveu@coppice.org>
- *
- * Copyright (C) 2002 Steve Underwood
- *
- * All rights reserved.
- */
-
-#if !defined(_FIR_H_)
-#define _FIR_H_
-
-/*
-   Ideas for improvement:
-
-   1/ Rewrite filter for dual MAC inner loop.  The issue here is handling
-   history sample offsets that are 16 bit aligned - the dual MAC needs
-   32 bit aligmnent.  There are some good examples in libbfdsp.
-
-   2/ Use the hardware circular buffer facility tohalve memory usage.
-
-   3/ Consider using internal memory.
-
-   Using less memory might also improve speed as cache misses will be
-   reduced. A drop in MIPs and memory approaching 50% should be
-   possible.
-
-   The foreground and background filters currenlty use a total of
-   about 10 MIPs/ch as measured with speedtest.c on a 256 TAP echo
-   can.
-*/
-
-/*
- * 16 bit integer FIR descriptor. This defines the working state for a single
- * instance of an FIR filter using 16 bit integer coefficients.
- */
-struct fir16_state_t {
-	int taps;
-	int curr_pos;
-	const int16_t *coeffs;
-	int16_t *history;
-};
-
-/*
- * 32 bit integer FIR descriptor. This defines the working state for a single
- * instance of an FIR filter using 32 bit integer coefficients, and filtering
- * 16 bit integer data.
- */
-struct fir32_state_t {
-	int taps;
-	int curr_pos;
-	const int32_t *coeffs;
-	int16_t *history;
-};
-
-/*
- * Floating point FIR descriptor. This defines the working state for a single
- * instance of an FIR filter using floating point coefficients and data.
- */
-struct fir_float_state_t {
-	int taps;
-	int curr_pos;
-	const float *coeffs;
-	float *history;
-};
-
-static inline const int16_t *fir16_create(struct fir16_state_t *fir,
-					      const int16_t *coeffs, int taps)
-{
-	fir->taps = taps;
-	fir->curr_pos = taps - 1;
-	fir->coeffs = coeffs;
-	fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL);
-	return fir->history;
-}
-
-static inline void fir16_flush(struct fir16_state_t *fir)
-{
-	memset(fir->history, 0, fir->taps * sizeof(int16_t));
-}
-
-static inline void fir16_free(struct fir16_state_t *fir)
-{
-	kfree(fir->history);
-}
-
-static inline int16_t fir16(struct fir16_state_t *fir, int16_t sample)
-{
-	int32_t y;
-	int i;
-	int offset1;
-	int offset2;
-
-	fir->history[fir->curr_pos] = sample;
-
-	offset2 = fir->curr_pos;
-	offset1 = fir->taps - offset2;
-	y = 0;
-	for (i = fir->taps - 1; i >= offset1; i--)
-		y += fir->coeffs[i] * fir->history[i - offset1];
-	for (; i >= 0; i--)
-		y += fir->coeffs[i] * fir->history[i + offset2];
-	if (fir->curr_pos <= 0)
-		fir->curr_pos = fir->taps;
-	fir->curr_pos--;
-	return (int16_t) (y >> 15);
-}
-
-static inline const int16_t *fir32_create(struct fir32_state_t *fir,
-					      const int32_t *coeffs, int taps)
-{
-	fir->taps = taps;
-	fir->curr_pos = taps - 1;
-	fir->coeffs = coeffs;
-	fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL);
-	return fir->history;
-}
-
-static inline void fir32_flush(struct fir32_state_t *fir)
-{
-	memset(fir->history, 0, fir->taps * sizeof(int16_t));
-}
-
-static inline void fir32_free(struct fir32_state_t *fir)
-{
-	kfree(fir->history);
-}
-
-static inline int16_t fir32(struct fir32_state_t *fir, int16_t sample)
-{
-	int i;
-	int32_t y;
-	int offset1;
-	int offset2;
-
-	fir->history[fir->curr_pos] = sample;
-	offset2 = fir->curr_pos;
-	offset1 = fir->taps - offset2;
-	y = 0;
-	for (i = fir->taps - 1; i >= offset1; i--)
-		y += fir->coeffs[i] * fir->history[i - offset1];
-	for (; i >= 0; i--)
-		y += fir->coeffs[i] * fir->history[i + offset2];
-	if (fir->curr_pos <= 0)
-		fir->curr_pos = fir->taps;
-	fir->curr_pos--;
-	return (int16_t) (y >> 15);
-}
-
-#endif