Re: [PATCH 2/2] Ignore storage device in modem mode on DWN-652

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Le mercredi 15 avril 2009 à 21:06 -0700, Greg KH a écrit :
> On Thu, Apr 09, 2009 at 02:32:34PM +0200, Pascal Terjan wrote:
> > My previous patch was actually not enough for a smooth use of DWN-652
> > 
> > Unlike other 3G keys which hide storage mode when in modem mode, 
> > D-Link DWN-652 in modem mode exposes 3 interfaces:
> > - First one is the USB storage
> > - Second one is for both control and connection
> > - Third one is unknown
> > 
> > This patch avoids usb-storage trying to switch again when already in
> > modem mode, have it ignored so that people don't get it automounted as
> > the content is useless under linux, and exposes only one ttyUSB instead 
> > of three.
> 
> The usb-storage device can be ejected and we aren't adding quirks for
> those types of devices.

I don't understand
When plugged in it is in CD-ROM emulation mode, and the quirk makes it
swith into modem mode. When in modem mode, it still presents the CD-ROM
emulation interface, but adds the 2 other interfaces.
If it does not get ignored by usb-storage when the other interfaces are
there, usb-storage and option will fight for the device (and usb-storage
may try to switch it again)

> The other ttyUSB connections can be useful, as network manager and other
> tools can access them for information.

Well the first one as really no meaning, it gets created on the mass
storage interface
Both control and connection happen on the ttyUSB1 on this device
The last one could stay even if its usage is unknown


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