From bec7a630a66a7d688486ae7ceb3f0b5307bdb2c5 Mon Sep 17 00:00:00 2001 From: yalin wang Date: Mon, 10 Aug 2015 17:15:57 +0800 Subject: [PATCH] isdn: Remove reverse_bits(), use revbit8() This change isdn driver, remove reverse_bits() function, use the generic revbit8() function instead. Signed-off-by: yalin wang Signed-off-by: David S. Miller --- drivers/isdn/mISDN/dsp_audio.c | 22 +++++----------------- 1 file changed, 5 insertions(+), 17 deletions(-) diff --git a/drivers/isdn/mISDN/dsp_audio.c b/drivers/isdn/mISDN/dsp_audio.c index 06022952a437..bbef98e7a16e 100644 --- a/drivers/isdn/mISDN/dsp_audio.c +++ b/drivers/isdn/mISDN/dsp_audio.c @@ -13,6 +13,7 @@ #include #include #include +#include #include "core.h" #include "dsp.h" @@ -137,27 +138,14 @@ static unsigned char linear2ulaw(short sample) return ulawbyte; } -static int reverse_bits(int i) -{ - int z, j; - z = 0; - - for (j = 0; j < 8; j++) { - if ((i & (1 << j)) != 0) - z |= 1 << (7 - j); - } - return z; -} - - void dsp_audio_generate_law_tables(void) { int i; for (i = 0; i < 256; i++) - dsp_audio_alaw_to_s32[i] = alaw2linear(reverse_bits(i)); + dsp_audio_alaw_to_s32[i] = alaw2linear(bitrev8((u8)i)); for (i = 0; i < 256; i++) - dsp_audio_ulaw_to_s32[i] = ulaw2linear(reverse_bits(i)); + dsp_audio_ulaw_to_s32[i] = ulaw2linear(bitrev8((u8)i)); for (i = 0; i < 256; i++) { dsp_audio_alaw_to_ulaw[i] = @@ -176,13 +164,13 @@ dsp_audio_generate_s2law_table(void) /* generating ulaw-table */ for (i = -32768; i < 32768; i++) { dsp_audio_s16_to_law[i & 0xffff] = - reverse_bits(linear2ulaw(i)); + bitrev8(linear2ulaw(i)); } } else { /* generating alaw-table */ for (i = -32768; i < 32768; i++) { dsp_audio_s16_to_law[i & 0xffff] = - reverse_bits(linear2alaw(i)); + bitrev8(linear2alaw(i)); } } } -- GitLab