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From: Jiri Slaby <jirislaby@gmail.com>
To: Sascha Sommer <saschasommer@freenet.de>
Cc: LKML <linux-kernel@vger.kernel.org>, rmk+mmc@arm.linux.org.uk
Subject: Re: Experimental driver for Ricoh Bay1Controller SD Card readers
Date: Sun, 07 Jan 2007 10:55:28 +0059	[thread overview]
Message-ID: <45A0C3A7.2040506@gmail.com> (raw)
In-Reply-To: <200701070032.27234.saschasommer@freenet.de>

Sascha Sommer wrote:
> Hi,
> 
> Attached is a very experimental driver for a Ricoh SD Card reader that can be 
> found in some notebooks like the Samsung P35.
> 
> Whenever a sd card is inserted into one of these notebooks, a virtual pcmcia 
> card will show up:
> 
> Socket 0:
>   product info: "RICOH", "Bay1Controller", "", ""
>   manfid: 0x0000, 0x0000
> 
> In order to write this driver I hacked qemu to have access to the cardbus 
> bridge containing this card. I then logged the register accesses of the 
> windows xp driver and tryed to analyse them.
> 
> As the meanings of most of the register are still unknown to me, I consider 
> this driver very experimental. It is possible that this driver might destroy 
> your data or your hardware. Use at your own risk! 
> 
> Other problems:
> - I only implemented reading support
> - I only tested with a 128 MB SD card, no idea what would be needed to support
>   other card types
> - irqs are not supported
> - dma is not supported
> - it is very slow
> - the registers can be found on the cardbus bridge and not on the virtual 
>   pcmcia card. The cardbus bridge is already claimed by yenta_socket. 
>   Therefore the driver currently uses pci_find_device to find the cardbus

- pci_find_device is no go today. Use pci_get_device (+ pci_dev_get, _put).
- ioremap->pci_iomap
- iobase should be __iomem.
- codingstyle (char* buffer, for(loop, if(data){, ...)

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E

  reply	other threads:[~2007-01-07  9:55 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-06 23:32 Sascha Sommer
2007-01-07  9:56 ` Jiri Slaby [this message]
2007-02-11 20:22   ` Sascha Sommer
2007-02-13  5:47     ` Pierre Ossman
2007-02-13  9:48       ` Samuel Thibault
2007-02-13 11:42       ` Sascha Sommer
2007-01-09 20:57 ` Samuel Thibault
2007-01-10 20:10 ` Pierre Ossman
2007-02-15 22:34 Ivan Babkin
2007-03-09 13:23 ` James

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