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| author | yalin wang <yalin.wang2010@gmail.com> | 2015-08-10 17:15:57 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-08-10 14:29:04 -0700 |
| commit | bec7a630a66a7d688486ae7ceb3f0b5307bdb2c5 (patch) | |
| tree | c2be49ff01e173d5ea46b7d084f21e5bef5209cd /drivers/isdn | |
| parent | 2f3a87326dd4948d21eee8245cde43e8fca9dddf (diff) | |
| download | lwn-bec7a630a66a7d688486ae7ceb3f0b5307bdb2c5.tar.gz lwn-bec7a630a66a7d688486ae7ceb3f0b5307bdb2c5.zip | |
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>
Diffstat (limited to 'drivers/isdn')
| -rw-r--r-- | drivers/isdn/mISDN/dsp_audio.c | 22 |
1 files 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 <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)); } } } |