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-rw-r--r--include/linux/crc8.h101
-rw-r--r--lib/Kconfig7
-rw-r--r--lib/Makefile1
-rw-r--r--lib/crc8.c86
4 files changed, 195 insertions, 0 deletions
diff --git a/include/linux/crc8.h b/include/linux/crc8.h
new file mode 100644
index 0000000..13c8dab
--- /dev/null
+++ b/include/linux/crc8.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2011 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifndef __CRC8_H_
+#define __CRC8_H_
+
+#include <linux/types.h>
+
+/* see usage of this value in crc8() description */
+#define CRC8_INIT_VALUE 0xFF
+
+/*
+ * Return value of crc8() indicating valid message+crc. This is true
+ * if a CRC is inverted before transmission. The CRC computed over the
+ * whole received bitstream is _table[x], where x is the bit pattern
+ * of the modification (almost always 0xff).
+ */
+#define CRC8_GOOD_VALUE(_table) (_table[0xFF])
+
+/* required table size for crc8 algorithm */
+#define CRC8_TABLE_SIZE 256
+
+/* helper macro assuring right table size is used */
+#define DECLARE_CRC8_TABLE(_table) \
+ static u8 _table[CRC8_TABLE_SIZE]
+
+/**
+ * crc8_populate_lsb - fill crc table for given polynomial in regular bit order.
+ *
+ * @table: table to be filled.
+ * @polynomial: polynomial for which table is to be filled.
+ *
+ * This function fills the provided table according the polynomial provided for
+ * regular bit order (lsb first). Polynomials in CRC algorithms are typically
+ * represented as shown below.
+ *
+ * poly = x^8 + x^7 + x^6 + x^4 + x^2 + 1
+ *
+ * For lsb first direction x^7 maps to the lsb. So the polynomial is as below.
+ *
+ * - lsb first: poly = 10101011(1) = 0xAB
+ */
+void crc8_populate_lsb(u8 table[CRC8_TABLE_SIZE], u8 polynomial);
+
+/**
+ * crc8_populate_msb - fill crc table for given polynomial in reverse bit order.
+ *
+ * @table: table to be filled.
+ * @polynomial: polynomial for which table is to be filled.
+ *
+ * This function fills the provided table according the polynomial provided for
+ * reverse bit order (msb first). Polynomials in CRC algorithms are typically
+ * represented as shown below.
+ *
+ * poly = x^8 + x^7 + x^6 + x^4 + x^2 + 1
+ *
+ * For msb first direction x^7 maps to the msb. So the polynomial is as below.
+ *
+ * - msb first: poly = (1)11010101 = 0xD5
+ */
+void crc8_populate_msb(u8 table[CRC8_TABLE_SIZE], u8 polynomial);
+
+/**
+ * crc8() - calculate a crc8 over the given input data.
+ *
+ * @table: crc table used for calculation.
+ * @pdata: pointer to data buffer.
+ * @nbytes: number of bytes in data buffer.
+ * @crc: previous returned crc8 value.
+ *
+ * The CRC8 is calculated using the polynomial given in crc8_populate_msb()
+ * or crc8_populate_lsb().
+ *
+ * The caller provides the initial value (either %CRC8_INIT_VALUE
+ * or the previous returned value) to allow for processing of
+ * discontiguous blocks of data. When generating the CRC the
+ * caller is responsible for complementing the final return value
+ * and inserting it into the byte stream. When validating a byte
+ * stream (including CRC8), a final return value of %CRC8_GOOD_VALUE
+ * indicates the byte stream data can be considered valid.
+ *
+ * Reference:
+ * "A Painless Guide to CRC Error Detection Algorithms", ver 3, Aug 1993
+ * Williams, Ross N., ross<at>ross.net
+ * (see URL http://www.ross.net/crc/download/crc_v3.txt).
+ */
+u8 crc8(const u8 table[CRC8_TABLE_SIZE], u8 *pdata, size_t nbytes, u8 crc);
+
+#endif /* __CRC8_H_ */
diff --git a/lib/Kconfig b/lib/Kconfig
index 9c10e38..ff9e5a3 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -89,6 +89,13 @@ config LIBCRC32C
require M here. See Castagnoli93.
Module will be libcrc32c.
+config CRC8
+ tristate "CRC8 function"
+ help
+ This option provides CRC8 function. Drivers may select this
+ when they need to do cyclic redundancy check according CRC8
+ algorithm. Module will be called crc8.
+
config AUDIT_GENERIC
bool
depends on AUDIT && !AUDIT_ARCH
diff --git a/lib/Makefile b/lib/Makefile
index 4b49a24..704959d 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_CRC_ITU_T) += crc-itu-t.o
obj-$(CONFIG_CRC32) += crc32.o
obj-$(CONFIG_CRC7) += crc7.o
obj-$(CONFIG_LIBCRC32C) += libcrc32c.o
+obj-$(CONFIG_CRC8) += crc8.o
obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/
diff --git a/lib/crc8.c b/lib/crc8.c
new file mode 100644
index 0000000..87b59ca
--- /dev/null
+++ b/lib/crc8.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2011 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/crc8.h>
+#include <linux/printk.h>
+
+/*
+ * crc8_populate_msb - fill crc table for given polynomial in reverse bit order.
+ *
+ * table: table to be filled.
+ * polynomial: polynomial for which table is to be filled.
+ */
+void crc8_populate_msb(u8 table[CRC8_TABLE_SIZE], u8 polynomial)
+{
+ int i, j;
+ const u8 msbit = 0x80;
+ u8 t = msbit;
+
+ table[0] = 0;
+
+ for (i = 1; i < CRC8_TABLE_SIZE; i *= 2) {
+ t = (t << 1) ^ (t & msbit ? polynomial : 0);
+ for (j = 0; j < i; j++)
+ table[i+j] = table[j] ^ t;
+ }
+}
+EXPORT_SYMBOL(crc8_populate_msb);
+
+/*
+ * crc8_populate_lsb - fill crc table for given polynomial in regular bit order.
+ *
+ * table: table to be filled.
+ * polynomial: polynomial for which table is to be filled.
+ */
+void crc8_populate_lsb(u8 table[CRC8_TABLE_SIZE], u8 polynomial)
+{
+ int i, j;
+ u8 t = 1;
+
+ table[0] = 0;
+
+ for (i = (CRC8_TABLE_SIZE >> 1); i; i >>= 1) {
+ t = (t >> 1) ^ (t & 1 ? polynomial : 0);
+ for (j = 0; j < CRC8_TABLE_SIZE; j += 2*i)
+ table[i+j] = table[j] ^ t;
+ }
+}
+EXPORT_SYMBOL(crc8_populate_lsb);
+
+/*
+ * crc8 - calculate a crc8 over the given input data.
+ *
+ * table: crc table used for calculation.
+ * pdata: pointer to data buffer.
+ * nbytes: number of bytes in data buffer.
+ * crc: previous returned crc8 value.
+ */
+u8 crc8(const u8 table[CRC8_TABLE_SIZE], u8 *pdata, size_t nbytes, u8 crc)
+{
+ /* loop over the buffer data */
+ while (nbytes-- > 0)
+ crc = table[(crc ^ *pdata++) & 0xff];
+
+ return crc;
+}
+EXPORT_SYMBOL(crc8);
+
+MODULE_DESCRIPTION("CRC8 (by Williams, Ross N.) function");
+MODULE_AUTHOR("Broadcom Corporation");
+MODULE_LICENSE("Dual BSD/GPL");
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