linux-kernel - Re: [PATCH] [MEMSTICK] Initial commit for Sony MemoryStick support

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Message-Id: <200712310056.17457.carlos@strangeworlds.co.uk>
Date:	Mon, 31 Dec 2007 00:56:16 +0000
From:	Carlos Corbacho <carlos@...angeworlds.co.uk>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	oakad@...mail.com.au, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, drzeus@...eus.cx,
	Alex Dubov <oakad@...oo.com>
Subject: Re: [PATCH] [MEMSTICK] Initial commit for Sony MemoryStick support

On Monday 31 December 2007 00:31:12 Jan Engelhardt wrote:
> On Dec 31 2007 00:01, Carlos Corbacho wrote:
> >On Monday 24 December 2007 03:06:37 oakad@...mail.com.au wrote:
> >> From: Alex Dubov <oakad@...oo.com>
> >>
> >> Sony MemoryStick cards are used in many products manufactured by Sony.
> >> They are available both as storage and as IO expansion cards. Currently,
> >> only MemoryStick Pro storage cards are supported via TI FlashMedia
> >> MemoryStick interface.
>
> Actually... my MS slot on PCG-U3 is recognized through usb_storage.

Then consider yourself very lucky - some laptop manufacturers play nice and 
the card reader identifies itself, and works as, a USB mass storage device; 
so it works out of the box with no extra drivers needed for either the card 
reader, or the flash memory card.

The Texas Instruments chip/ card reader that Alex's work here is currently 
aimed at does not - it has a completely proprietary, so called "FlashMedia" 
chip/ interface that talks to MMC/ SD, MemoryStick (/ Pro), and SmartMedia/ 
xD cards, of which TI have refused to release any specs.

Yes, this chip doesn't even use sdhci for communicating with MMC/ SD cards - 
tifm_sd (Alex's previous work on the MMC/ SD front for this TI chip) handles 
that.

MemoryStick support is more complicated in this case than MMC/ SD, given that 
on top of TI refusing to release specs for their own FlashMedia chips, Sony 
will also not release any specs on MemoryStick cards; the same is also true 
of xD with Olympus and Fuji.

-Carlos
-- 
E-Mail: carlos@...angeworlds.co.uk
Web: strangeworlds.co.uk
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