linux-kernel - Re: XD/smartmedia - how to implement it right?

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Message-ID: <20091121102542.GA21136@logfs.org>
Date:	Sat, 21 Nov 2009 11:25:43 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Maxim Levitsky <slevmax@...technion.ac.il>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Alex Dubov <oakad@...oo.com>, arnd@...db.de, tglx@...utonix.de
Subject: Re: XD/smartmedia - how to implement it right?

On Sat, 21 November 2009 02:25:44 +0200, Maxim Levitsky wrote:
> 
> This thread is meant to continue discussion about XD/smartmedia support
> in linux.
> 
> I CC'd few peoples that participated in original discussion.
> 
> Alex Dubov attempted to write a driver for jmicron device (I have it
> btw), but this was rejected due to code duplication.
> 
> I successfully reverse engineered (in my free time) the XD card reader
> found on my laptop (ricoh based one)
> 
> I would like to know how you think to implement the subsystem support
> right.
> 
> I would go with mmc subsystem + FTL, but according to original thread,
> there are numerous problems with this approach.
> 
> Any advice is appreciated.

A novel approach might be to just send the code as a patch.  Last time
around noone seemed to have had a real look.

The "mtd uses blocking calls" argument I can help with.  For some other
project I've added non-blocking calls to mtd[1].

Biggest problems I see are a) the userspace interface and b) allowing
both raw flash access through MTD and block device access with an FTL.

[1] http://lists.infradead.org/pipermail/linux-mtd/2009-November/028065.html

Jörn

-- 
The wise man seeks everything in himself; the ignorant man tries to get
everything from somebody else.
-- unknown
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