Re: [PATCH] ar9170usb: add mode-switching for AVM Fritz!WLAN USB N devices in cdrom mode

[Josua Dietze <digidietze@draisberghof.de>]

Alan Stern schrieb:

> On Wed, 4 Nov 2009, Johannes Berg wrote:
> 
>> I think you forgot to consider the case where both the driver and the
>> mode switch code need an update to handle a new device. This is relevant
>> in the case where a new device shows up that needs mode-switching, but
>> even after switching has an ID that the current driver doesn't know
>> about.
> 
> This could be handled by programs like usb_modeswitch.  The USB serial 
> drivers allow IDs to be added dynamically.
> 
> Of course, if something more than that is required then the situation 
> would be different.  However I think this is pretty rare.

So far, mostly cdc_acm and high speed serial devices are known. 
There is the special case of the HSO interface for "Option" modems 
which resembles a network device IIRC. But switching them is pretty 
straightforward and driver support by the manufacturer seems to be OK.
I don't know of any "switching" devices which are completely 
unsupported by the recent kernels.

usb_modeswitch now has a wrapper which loads the "option" module by 
default if the "new" device will not be claimed by "cdc_acm", "hso" 
or "option". Using the "new_id" feature *any* ID can be used with it 
right away.


Josua Dietze
-- 
Man is the only creature on earth enabled to take a
warm meal while flying!                      Loriot