Re: [GIT PATCH] W1 patches for 2.6.13

[Evgeniy Polyakov <johnpol@2ka.mipt.ru>]

On Thu, Sep 08, 2005 at 08:30:36PM -0700, Greg KH (gregkh@suse.de) wrote:
> On Fri, Sep 09, 2005 at 01:30:09AM +0200, Marcel Holtmann wrote:
> > Hi Greg,
> > 
> > > Here are some w1 patches that have been in the -mm tree for a while.
> > > They add a new driver, and fix up the netlink logic a lot.  They also
> > > add a crc16 implementation that is needed.
> > 
> > adding the CRC-16 is very cool. I was just about to submit one by my
> > own, because it is also needed for the Bluetooth L2CAP retransmission
> > and flow control support.
> > 
> > What about the 1-Wire notes inside the CRC-16 code. This suppose to be
> > generic code and so this doesn't belong there.
> 
> Yes, those comments don't belong there.  Evgeniy, want to fix this?

No problem. Patch attached.

> thanks,
> 
> greg k-h

Remove w1 specific comments from generic crc16 implementation.

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

diff --git a/include/linux/crc16.h b/include/linux/crc16.h
--- a/include/linux/crc16.h
+++ b/include/linux/crc16.h
@@ -1,22 +1,11 @@
 /*
  *	crc16.h - CRC-16 routine
  *
- * Implements the standard CRC-16, as used with 1-wire devices:
+ * Implements the standard CRC-16:
  *   Width 16
  *   Poly  0x8005 (x^16 + x^15 + x^2 + 1)
  *   Init  0
  *
- * For 1-wire devices, the CRC is stored inverted, LSB-first
- *
- * Example buffer with the CRC attached:
- *   31 32 33 34 35 36 37 38 39 C2 44
- *
- * The CRC over a buffer with the CRC attached is 0xB001.
- * So, if (crc16(0, buf, size) == 0xB001) then the buffer is valid.
- *
- * Refer to "Application Note 937: Book of iButton Standards" for details.
- * http://www.maxim-ic.com/appnotes.cfm/appnote_number/937
- *
  * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
  *
  * This source code is licensed under the GNU General Public License,
@@ -28,9 +17,6 @@
 
 #include <linux/types.h>
 
-#define CRC16_INIT		0
-#define CRC16_VALID		0xb001
-
 extern u16 const crc16_table[256];
 
 extern u16 crc16(u16 crc, const u8 *buffer, size_t len);

-- 
	Evgeniy Polyakov