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Commit bec7a630 authored by yalin wang's avatar yalin wang Committed by David S. Miller
Browse files

isdn: Remove reverse_bits(), use revbit8() 



This change isdn driver, remove reverse_bits() function,
use the generic revbit8() function instead.

Signed-off-by: default avataryalin wang <yalin.wang2010@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2f3a8732

drivers/isdn/mISDN/dsp_audio.c

+5 −17
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/mISDNif.h>

#include <linux/mISDNdsp.h>

#include <linux/export.h>

#include <linux/bitrev.h>

#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));

		}

	}

}