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

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Message-ID: <3415E2A2AB26944B9159CDB22001004D01773F61@nestea.sierrawireless.local>
Date:	Mon, 14 May 2007 16:10:27 -0700
From:	"Kevin Lloyd" <klloyd@...rrawireless.com>
To:	"Daniel Drake" <dsd@...too.org>
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

Not a bad idea. When using the US_FL_IGNORE_DEVICE flag, that causes the
usb-storage driver to no load the device and allow another driver
properly load it? The reason I ask is because I previously had a
separate driver for the device, however there were priority issues
regarding which loaded first usb-storage or the separate driver.

Thanks,
   - Kevin

-----Original Message-----
From: Daniel Drake [mailto:dsd@...too.org] 
Sent: Monday, May 14, 2007 3:59 PM
To: Kevin Lloyd
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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