lib: add crc7 from Linux

Crc7 is used to compute mmc spi command packet checksum. Copy from linux-2.6 lib/crc7.c include/linux/crc7.h commit ad241528c4919505afccb022acbab3eeb0db4d80 Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

lib: add crc7 from Linux
Crc7 is used to compute mmc spi command packet checksum. Copy from linux-2.6 lib/crc7.c include/linux/crc7.h commit ad241528c4919505afccb022acbab3eeb0db4d80 Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Thomas Chou · Wolfgang Denk
1 parent 5c4fa2eea0
Showing 3 changed files with 77 additions and 0 deletions Side-by-side Diff
include/linux/crc7.h
lib/Makefile
lib/crc7.c
+#ifndef _LINUX_CRC7_H
+#define _LINUX_CRC7_H
+#include <linux/types.h>
+
+extern const u8 crc7_syndrome_table[256];
+
+static inline u8 crc7_byte(u8 crc, u8 data)
+{
+	return crc7_syndrome_table[(crc << 1) ^ data];
+}
+
+extern u8 crc7(u8 crc, const u8 *buffer, size_t len);
+
+#endif
@@ -32,6 +32,7 @@
 COBJS-$(CONFIG_BZIP2) += bzlib_randtable.o
 COBJS-$(CONFIG_BZIP2) += bzlib_huffman.o
 COBJS-$(CONFIG_USB_TTY) += circbuf.o
+COBJS-y += crc7.o
 COBJS-y += crc16.o
 COBJS-y += crc32.o
 COBJS-y += ctype.o
+/*
+ *      crc7.c
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/crc7.h>
+
+
+/* Table for CRC-7 (polynomial x^7 + x^3 + 1) */
+const u8 crc7_syndrome_table[256] = {
+	0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
+	0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
+	0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
+	0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
+	0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
+	0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
+	0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
+	0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
+	0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
+	0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
+	0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
+	0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
+	0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
+	0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
+	0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
+	0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
+	0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
+	0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
+	0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
+	0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
+	0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
+	0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
+	0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
+	0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
+	0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
+	0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
+	0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
+	0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
+	0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
+	0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
+	0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
+	0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
+};
+
+/**
+ * crc7 - update the CRC7 for the data buffer
+ * @crc:     previous CRC7 value
+ * @buffer:  data pointer
+ * @len:     number of bytes in the buffer
+ * Context: any
+ *
+ * Returns the updated CRC7 value.
+ */
+u8 crc7(u8 crc, const u8 *buffer, size_t len)
+{
+	while (len--)
+		crc = crc7_byte(crc, *buffer++);
+	return crc;
+}
	1	+#ifndef _LINUX_CRC7_H
	2	+#define _LINUX_CRC7_H
	3	+#include <linux/types.h>
	4	+
	5	+extern const u8 crc7_syndrome_table[256];
	6	+
	7	+static inline u8 crc7_byte(u8 crc, u8 data)
	8	+{
	9	+ return crc7_syndrome_table[(crc << 1) ^ data];
	10	+}
	11	+
	12	+extern u8 crc7(u8 crc, const u8 *buffer, size_t len);
	13	+
	14	+#endif
...	...	@@ -32,6 +32,7 @@
32	32	COBJS-$(CONFIG_BZIP2) += bzlib_randtable.o
33	33	COBJS-$(CONFIG_BZIP2) += bzlib_huffman.o
34	34	COBJS-$(CONFIG_USB_TTY) += circbuf.o
	35	+COBJS-y += crc7.o
35	36	COBJS-y += crc16.o
36	37	COBJS-y += crc32.o
37	38	COBJS-y += ctype.o
	1	+/*
	2	+ * crc7.c
	3	+ *
	4	+ * This source code is licensed under the GNU General Public License,
	5	+ * Version 2. See the file COPYING for more details.
	6	+ */
	7	+
	8	+#include <linux/types.h>
	9	+#include <linux/crc7.h>
	10	+
	11	+
	12	+/* Table for CRC-7 (polynomial x^7 + x^3 + 1) */
	13	+const u8 crc7_syndrome_table[256] = {
	14	+ 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
	15	+ 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
	16	+ 0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
	17	+ 0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
	18	+ 0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
	19	+ 0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
	20	+ 0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
	21	+ 0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
	22	+ 0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
	23	+ 0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
	24	+ 0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
	25	+ 0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
	26	+ 0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
	27	+ 0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
	28	+ 0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
	29	+ 0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
	30	+ 0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
	31	+ 0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
	32	+ 0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
	33	+ 0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
	34	+ 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
	35	+ 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
	36	+ 0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
	37	+ 0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
	38	+ 0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
	39	+ 0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
	40	+ 0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
	41	+ 0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
	42	+ 0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
	43	+ 0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
	44	+ 0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
	45	+ 0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
	46	+};
	47	+
	48	+/**
	49	+ * crc7 - update the CRC7 for the data buffer
	50	+ * @crc: previous CRC7 value
	51	+ * @buffer: data pointer
	52	+ * @len: number of bytes in the buffer
	53	+ * Context: any
	54	+ *
	55	+ * Returns the updated CRC7 value.
	56	+ */
	57	+u8 crc7(u8 crc, const u8 *buffer, size_t len)
	58	+{
	59	+ while (len--)
	60	+ crc = crc7_byte(crc, *buffer++);
	61	+ return crc;
	62	+}