Revision a1e9185d20b56af04022d2e656802254f4ea47eb authored by Linus Torvalds on 02 December 2022, 23:40:35 UTC, committed by Linus Torvalds on 02 December 2022, 23:40:35 UTC
Pull sound fixes from Takashi Iwai: "Likely the last piece for 6.1; the only significant fixes are ASoC core ops fixes, while others are device-specific (rather minor) fixes in ASoC and FireWire drivers. All appear safe enough to take as a late stage material" * tag 'sound-6.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: dice: fix regression for Lexicon I-ONIX FW810S ASoC: cs42l51: Correct PGA Volume minimum value ASoC: ops: Correct bounds check for second channel on SX controls ASoC: tlv320adc3xxx: Fix build error for implicit function declaration ASoC: ops: Check bounds for second channel in snd_soc_put_volsw_sx() ASoC: ops: Fix bounds check for _sx controls ASoC: fsl_micfil: explicitly clear CHnF flags ASoC: fsl_micfil: explicitly clear software reset bit
average.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_AVERAGE_H
#define _LINUX_AVERAGE_H
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/log2.h>
/*
* Exponentially weighted moving average (EWMA)
*
* This implements a fixed-precision EWMA algorithm, with both the
* precision and fall-off coefficient determined at compile-time
* and built into the generated helper funtions.
*
* The first argument to the macro is the name that will be used
* for the struct and helper functions.
*
* The second argument, the precision, expresses how many bits are
* used for the fractional part of the fixed-precision values.
*
* The third argument, the weight reciprocal, determines how the
* new values will be weighed vs. the old state, new values will
* get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
* that this parameter must be a power of two for efficiency.
*/
#define DECLARE_EWMA(name, _precision, _weight_rcp) \
struct ewma_##name { \
unsigned long internal; \
}; \
static inline void ewma_##name##_init(struct ewma_##name *e) \
{ \
BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
/* \
* Even if you want to feed it just 0/1 you should have \
* some bits for the non-fractional part... \
*/ \
BUILD_BUG_ON((_precision) > 30); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
e->internal = 0; \
} \
static inline unsigned long \
ewma_##name##_read(struct ewma_##name *e) \
{ \
BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
BUILD_BUG_ON((_precision) > 30); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
return e->internal >> (_precision); \
} \
static inline void ewma_##name##_add(struct ewma_##name *e, \
unsigned long val) \
{ \
unsigned long internal = READ_ONCE(e->internal); \
unsigned long weight_rcp = ilog2(_weight_rcp); \
unsigned long precision = _precision; \
\
BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
BUILD_BUG_ON((_precision) > 30); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
\
WRITE_ONCE(e->internal, internal ? \
(((internal << weight_rcp) - internal) + \
(val << precision)) >> weight_rcp : \
(val << precision)); \
}
#endif /* _LINUX_AVERAGE_H */
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