drivers: isdn: use kernel macros to convert hex digit

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: Tilman Schmidt <tilman@imap.cc>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 16 deletions

diff --git a/drivers/isdn/capi/capidrv.c b/drivers/isdn/capi/capidrv.c
index bf55ed5f38e..2978bdaa6b8 100644
--- a/drivers/isdn/capi/capidrv.c
+++ b/drivers/isdn/capi/capidrv.c
@@ -1450,12 +1450,9 @@ static void handle_dtrace_data(capidrv_contr *card,
         }
 
         for (p = data, end = data+len; p < end; p++) {
-                u8 w;
                 PUTBYTE_TO_STATUS(card, ' ');
-                w = (*p >> 4) & 0xf;
-                PUTBYTE_TO_STATUS(card, (w < 10) ? '0'+w : 'A'-10+w);
-                w = *p & 0xf;
-                PUTBYTE_TO_STATUS(card, (w < 10) ? '0'+w : 'A'-10+w);
+                PUTBYTE_TO_STATUS(card, hex_asc_hi(*p));
+                PUTBYTE_TO_STATUS(card, hex_asc_lo(*p));
         }
         PUTBYTE_TO_STATUS(card, '\n');
 
diff --git a/drivers/isdn/hisax/q931.c b/drivers/isdn/hisax/q931.c
index 8b853d58e82..c0771f98fa1 100644
--- a/drivers/isdn/hisax/q931.c
+++ b/drivers/isdn/hisax/q931.c
@@ -1152,20 +1152,11 @@ QuickHex(char *txt, u_char * p, int cnt)
 {
         register int i;
         register char *t = txt;
-        register u_char w;
 
         for (i = 0; i < cnt; i++) {
                 *t++ = ' ';
-                w = (p[i] >> 4) & 0x0f;
-                if (w < 10)
-                        *t++ = '0' + w;
-                else
-                        *t++ = 'A' - 10 + w;
-                w = p[i] & 0x0f;
-                if (w < 10)
-                        *t++ = '0' + w;
-                else
-                        *t++ = 'A' - 10 + w;
+                *t++ = hex_asc_hi(p[i]);
+                *t++ = hex_asc_lo(p[i]);
         }
         *t++ = 0;
         return (t - txt);