qcacmn: Update QDF API to convert ASCII hex char to decimal value

To convert ASCII hexa decimal character to unsigned value and similarly
to convert string of ASCII hexa decimal characters to array of decimal
values, there is need of QDF API.

Therfore, add QDF wrapper functions to kernel API hex_to_bin() and
hex2bin().

Change-Id: I4692961eeba9067f9b737f7deeefca397ff1a7bf
CRs-Fixed: 2274320

qdf/inc/qdf_util.h

@@ -707,4 +707,49 @@ void qdf_get_random_bytes(void *buf, int nbytes)
 {
 	return __qdf_get_random_bytes(buf, nbytes);
 }
+
+/**
+ * qdf_hex_to_bin() - QDF API to Convert hexa decimal ASCII character to
+ * unsigned integer value.
+ * @ch: hexa decimal ASCII character
+ *
+ * Return: For hexa decimal ASCII char return actual decimal value
+ *	   else -1 for bad input.
+ */
+static inline
+int qdf_hex_to_bin(char ch)
+{
+	return __qdf_hex_to_bin(ch);
+}
+
+/**
+ * qdf_hex_str_to_binary() - QDF API to Convert string of hexa decimal
+ * ASCII characters to array of unsigned integers.
+ * @dst: output array to hold converted values
+ * @src: input string of hexa decimal ASCII characters
+ * @count: size of dst string
+ *
+ * This function is used to convert string of hexa decimal characters to
+ * array of unsigned integers and caller should ensure:
+ *	a) @dst, @src are not NULL,
+ *	b) size of @dst should be (size of src / 2)
+ *
+ * Example 1:
+ * src = 11aa, means, src[0] = '1', src[1] = '2', src[2] = 'a', src[3] = 'a'
+ * count = (size of src / 2) = 2
+ * after conversion, dst[0] = 0x11, dst[1] = oxAA and return (0).
+ *
+ * Example 2:
+ * src = 11az, means, src[0] = '1', src[1] = '2', src[2] = 'a', src[3] = 'z'
+ * src[3] is not ASCII hexa decimal character, return negative value (-1).
+ *
+ * Return: For a string of hexa decimal ASCII characters return 0
+ *	   else -1 for bad input.
+ */
+static inline
+int qdf_hex_str_to_binary(u8 *dst, const char *src, size_t count)
+{
+	return __qdf_hex_str_to_binary(dst, src, count);
+}
+
 #endif /*_QDF_UTIL_H*/