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>

diff --git a/drivers/isdn/mISDN/dsp_audio.c b/drivers/isdn/mISDN/dsp_audio.c
index 06022952a43780a6048f1890486cd1e713eab43b..bbef98e7a16efb438ef38856d8e043397f674804 100644 (file)
--- a/drivers/isdn/mISDN/dsp_audio.c
+++ b/drivers/isdn/mISDN/dsp_audio.c
@@ -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));
                }
        }
 }