linux-kernel - Re: Support for TI FlashMedia (pci id 104c:8033, 104c:803b) flash card readers

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Date:	Tue, 5 Sep 2006 12:12:41 -0700
From:	Greg KH <greg@...ah.com>
To:	Pierre Ossman <drzeus-list@...eus.cx>
Cc:	Andrew Morton <akpm@...l.org>, Alex Dubov <oakad@...oo.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Support for TI FlashMedia (pci id 104c:8033, 104c:803b) flash card readers

On Sun, Sep 03, 2006 at 11:53:35AM +0200, Pierre Ossman wrote:
> Greg KH wrote:
> > On Sat, Sep 02, 2006 at 10:50:14PM +0200, Pierre Ossman wrote:
> >   
> >>
> >> This is a PCI device yes. Which has a number of card readers as
> >> separate, hot-pluggable functions. Currently this means it interacts
> >> with the block device and MMC subsystems of the kernel. As more drivers
> >> pop up, the other card formats will probably get their own subsystems
> >> the way MMC has. So there are three issues here:
> >>
> >>  * Where to put the central module that handles the generic parts of the
> >> chip and pulls in the other modules as needed.
> >>     
> >
> > Right now, the drivers/mmc directory has such a driver, the sdhci.c
> > file, right?
> >
> >   
> 
> Not quite. sdhci is a vendor-neutral MMC controller driver. What I'm
> talking about here is the interface-neutral portion for the Texas
> Instruments multi-format card reader.
> 
> >>  * If the subfunction modules should be put with the subsystems they
> >> connect to or with the main, generic module.
> >>     
> >
> > It all depends on how bit it grows over time.  It is always easy to move
> > files around at a later time if you so wish.
> >
> > For now, is the drivers/mmc/ directory acceptable?  If other card
> > formats show up, we can reconsider it at that time.  Is that ok?
> >   
> 
> Support for MemoryStick isn't that far off in the future, so it would be
> preferable to get this right from the start.
> 
> Is there no driver in the kernel that already has this design?

Not directly, no.  USB-storage handles a wide range of devices like this
by virtue of them following the usb storage spec (which is really just
scsi).

thanks,

greg k-h
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