[PATCH 2/4] 2.6.7-mm2, Use it in IRDA drivers
From: Andrey Panin
Date: Thu Jun 24 2004 - 07:58:14 EST
This patch makes IRDA subsystem use common crc16 code.
Signed-off-by: Andrey Panin <pazke@xxxxxxxxx>
include/net/irda/crc.h | 10 ++-----
net/irda/Kconfig | 1
net/irda/Makefile | 2 -
net/irda/crc.c | 68 -------------------------------------------------
4 files changed, 5 insertions(+), 76 deletions(-)
diff -urpN -X /usr/share/dontdiff linux-2.6.7-rc1-mm1.vanilla/include/net/irda/crc.h linux-2.6.7-rc1-mm1/include/net/irda/crc.h
--- linux-2.6.7-rc1-mm1.vanilla/include/net/irda/crc.h Wed Apr 28 22:56:46 2004
+++ linux-2.6.7-rc1-mm1/include/net/irda/crc.h Sat May 8 13:59:27 2004
@@ -15,19 +15,15 @@
#define IRDA_CRC_H
#include <linux/types.h>
+#include <linux/crc16.h>
#define INIT_FCS 0xffff /* Initial FCS value */
#define GOOD_FCS 0xf0b8 /* Good final FCS value */
-extern __u16 const irda_crc16_table[];
-
/* Recompute the FCS with one more character appended. */
-static inline __u16 irda_fcs(__u16 fcs, __u8 c)
-{
- return (((fcs) >> 8) ^ irda_crc16_table[((fcs) ^ (c)) & 0xff]);
-}
+#define irda_fcs(fcs, c) crc16_byte(fcs, c)
/* Recompute the FCS with len bytes appended. */
-__u16 irda_calc_crc16( __u16 fcs, __u8 const *buf, size_t len);
+#define irda_calc_crc16(fcs, buf, len) crc16(fcs, buf, len)
#endif
diff -urpN -X /usr/share/dontdiff linux-2.6.7-rc1-mm1.vanilla/net/irda/Kconfig linux-2.6.7-rc1-mm1/net/irda/Kconfig
--- linux-2.6.7-rc1-mm1.vanilla/net/irda/Kconfig Wed Apr 28 22:57:09 2004
+++ linux-2.6.7-rc1-mm1/net/irda/Kconfig Sat May 8 14:13:30 2004
@@ -5,6 +5,7 @@
menuconfig IRDA
depends on NET
tristate "IrDA (infrared) subsystem support"
+ select CRC16
---help---
Say Y here if you want to build support for the IrDA (TM) protocols.
The Infrared Data Associations (tm) specifies standards for wireless
diff -urpN -X /usr/share/dontdiff linux-2.6.7-rc1-mm1.vanilla/net/irda/Makefile linux-2.6.7-rc1-mm1/net/irda/Makefile
--- linux-2.6.7-rc1-mm1.vanilla/net/irda/Makefile Wed Apr 28 22:57:09 2004
+++ linux-2.6.7-rc1-mm1/net/irda/Makefile Sat May 8 13:57:16 2004
@@ -9,7 +9,7 @@ obj-$(CONFIG_IRCOMM) += ircomm/
irda-y := iriap.o iriap_event.o irlmp.o irlmp_event.o irlmp_frame.o \
irlap.o irlap_event.o irlap_frame.o timer.o qos.o irqueue.o \
- irttp.o irda_device.o irias_object.o crc.o wrapper.o af_irda.o \
+ irttp.o irda_device.o irias_object.o wrapper.o af_irda.o \
discovery.o parameters.o irmod.o
irda-$(CONFIG_PROC_FS) += irproc.o
irda-$(CONFIG_SYSCTL) += irsysctl.o
diff -urpN -X /usr/share/dontdiff linux-2.6.7-rc1-mm1.vanilla/net/irda/crc.c linux-2.6.7-rc1-mm1/net/irda/crc.c
--- linux-2.6.7-rc1-mm1.vanilla/net/irda/crc.c Wed Apr 28 22:57:09 2004
+++ linux-2.6.7-rc1-mm1/net/irda/crc.c Thu Jan 1 03:00:00 1970
@@ -1,68 +0,0 @@
-/*********************************************************************
- *
- * Filename: crc.c
- * Version: 0.1
- * Description: CRC calculation routines
- * Status: Experimental.
- * Author: Dag Brattli <dagb@xxxxxxxxx>
- * Created at: Mon Aug 4 20:40:53 1997
- * Modified at: Sun May 2 20:28:08 1999
- * Modified by: Dag Brattli <dagb@xxxxxxxxx>
- * Sources: ppp.c by Michael Callahan <callahan@xxxxxxxxxxxxxx>
- * Al Longyear <longyear@xxxxxxxxxx>
- *
- ********************************************************************/
-
-#include <net/irda/crc.h>
-#include <linux/module.h>
-
-/*
- * This mysterious table is just the CRC of each possible byte. It can be
- * computed using the standard bit-at-a-time methods. The polynomial can
- * be seen in entry 128, 0x8408. This corresponds to x^0 + x^5 + x^12.
- * Add the implicit x^16, and you have the standard CRC-CCITT.
- */
-__u16 const irda_crc16_table[256] =
-{
- 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
- 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
- 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
- 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
- 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
- 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
- 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
- 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
- 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
- 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
- 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
- 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
- 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
- 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
- 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
- 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
- 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
- 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
- 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
- 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
- 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
- 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
- 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
- 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
- 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
- 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
- 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
- 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
- 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
- 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
- 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
- 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
-};
-EXPORT_SYMBOL(irda_crc16_table);
-
-__u16 irda_calc_crc16( __u16 fcs, __u8 const *buf, size_t len)
-{
- while (len--)
- fcs = irda_fcs(fcs, *buf++);
- return fcs;
-}
-EXPORT_SYMBOL(irda_calc_crc16);
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/