linux-kernel - Re: [PATCH] usb-storage: Add support for unusual device by Sierra Wireless

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Date:	Mon, 14 May 2007 18:59:23 -0400
From:	Daniel Drake <dsd@...too.org>
To:	Kevin Lloyd <klloyd@...rrawireless.com>
CC:	gregkh@...e.de, mdharm-usb@...-eyed-alien.net,
	linux-usb-users@...ts.sourceforge.net,
	usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb-storage: Add support for unusual device by Sierra
 Wireless

Kevin Lloyd wrote:
> From: Kevin Lloyd <linux@...rrawireless.com>
> 
> This patch is targeted for the 2.6.21.1 kernel source. It adds support
> for Sierra Wireless devices with auto-install support to the 
> unusual_devices list of the usb-mass storage driver. This requires 
> changes to Kconfig, Makefile, usb.c, unusual_devs.h, and the addition of 
> sierra_ms.h & sierra_ms.c.

We have to do a similar thing for some zd1211rw USB-wireless devices, 
which appear as a virtual CDROM drive on plugin. To convert them to a 
proper wireless device, the cdrom has to be ejected, then the device 
disconnects and reconnects with different ID's (and the wireless endpoints).

Originally I wrote a usb-storage subdriver to handle the auto-eject, but 
this was rejected. It was decided to make usb-storage simply ignore the 
devices, and have the zd1211rw driver do the eject operation. The same 
may also apply in your case. See the US_FL_IGNORE_DEVICE flag, and the 
DEVICE_INSTALLER handling in drivers/net/wireless/zd1211rw/zd_usb.c

Daniel

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