linux-kernel - Re: [RFC] i2c-tools: i2ctransfer: add new tool

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Message-ID: <20150508225831.63f2d895@endymion.delvare>
Date:	Fri, 8 May 2015 22:58:31 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Randy Grunwell <rgrunwell@...ost.com>
Cc:	linux-i2c@...r.kernel.org, linux-sh@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [RFC] i2c-tools: i2ctransfer: add new tool

Hi Randy,

On Fri, 8 May 2015 15:28:19 +0000, Randy Grunwell wrote:
> I'm curious why this would not be an extension of the i2c read and write commands? Would it not make sense to add a tier above "Block" (perhaps "Extended"), and use the same syntax?
> 
> Forgive me if this is out of place - I'm quite new, both here and to Linux/C.

No problem, asking questions is fine.

The thing is that this isn't only a question of maximum length. It is
also a question of which kernel interface is being used (ioctl I2C_RDWR
instead of ioctl I2C_SMBUS.) Additionally, i2ctransfer supports any
combination of reading and writing, so in essence it doesn't extend a
specific existing tool, it extends all of them. And the command line
interface will be completely different, whichever we settle for. So it
seems quite obvious that a separate tool is the best way to implement
the feature, as Wolfram did.

-- 
Jean Delvare
SUSE L3 Support
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