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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 <yalin.wang2010@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
yalin wang 2015-08-10 17:15:57 +08:00 committed by David S. Miller
parent 2f3a87326d
commit bec7a630a6
1 changed files with 5 additions and 17 deletions
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22
drivers/isdn/mISDN/dsp_audio.c
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@ -13,6 +13,7 @@
#include <linux/mISDNif.h> #include <linux/mISDNif.h>
#include <linux/mISDNdsp.h> #include <linux/mISDNdsp.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/bitrev.h>
#include "core.h" #include "core.h"
#include "dsp.h" #include "dsp.h"
@ -137,27 +138,14 @@ static unsigned char linear2ulaw(short sample)
return ulawbyte; 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) void dsp_audio_generate_law_tables(void)
{ {
int i; int i;
for (i = 0; i < 256; 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++) 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++) { for (i = 0; i < 256; i++) {
dsp_audio_alaw_to_ulaw[i] = dsp_audio_alaw_to_ulaw[i] =
@ -176,13 +164,13 @@ dsp_audio_generate_s2law_table(void)
/* generating ulaw-table */ /* generating ulaw-table */
for (i = -32768; i < 32768; i++) { for (i = -32768; i < 32768; i++) {
dsp_audio_s16_to_law[i & 0xffff] = dsp_audio_s16_to_law[i & 0xffff] =
reverse_bits(linear2ulaw(i)); bitrev8(linear2ulaw(i));
} }
} else { } else {
/* generating alaw-table */ /* generating alaw-table */
for (i = -32768; i < 32768; i++) { for (i = -32768; i < 32768; i++) {
dsp_audio_s16_to_law[i & 0xffff] = dsp_audio_s16_to_law[i & 0xffff] =
reverse_bits(linear2alaw(i)); bitrev8(linear2alaw(i));
} }
} }
} }