net: can: remove custom hex_to_bin()

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 21 deletions

diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
index aa8ad73477ba..65e54fd0a8d7 100644
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -56,6 +56,7 @@
 #include <linux/sched.h>
 #include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <linux/can.h>
 
 static __initdata const char banner[] =
@@ -142,21 +143,6 @@ static struct net_device **slcan_devs;
   *                     STANDARD SLCAN DECAPSULATION                     *
   ************************************************************************/
 
-static int asc2nibble(char c)
-{
-
-        if ((c >= '0') && (c <= '9'))
-                return c - '0';
-
-        if ((c >= 'A') && (c <= 'F'))
-                return c - 'A' + 10;
-
-        if ((c >= 'a') && (c <= 'f'))
-                return c - 'a' + 10;
-
-        return 16; /* error */
-}
-
 /* Send one completely decapsulated can_frame to the network layer */
 static void slc_bump(struct slcan *sl)
 {
@@ -195,18 +181,16 @@ static void slc_bump(struct slcan *sl)
         *(u64 *) (&cf.data) = 0; /* clear payload */
 
         for (i = 0, dlc_pos++; i < cf.can_dlc; i++) {
-
-                tmp = asc2nibble(sl->rbuff[dlc_pos++]);
-                if (tmp > 0x0F)
+                tmp = hex_to_bin(sl->rbuff[dlc_pos++]);
+                if (tmp < 0)
                         return;
                 cf.data[i] = (tmp << 4);
-                tmp = asc2nibble(sl->rbuff[dlc_pos++]);
-                if (tmp > 0x0F)
+                tmp = hex_to_bin(sl->rbuff[dlc_pos++]);
+                if (tmp < 0)
                         return;
                 cf.data[i] |= tmp;
         }
 
-
         skb = dev_alloc_skb(sizeof(struct can_frame));
         if (!skb)
                 return;