linux-kernel - Re: Not able to read USB speed and descriptor

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Date:	Wed, 24 Jun 2009 12:51:48 +0530
From:	Prabhu Chawandi <prabhu.chavandi@...il.com>
To:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Not able to read USB speed and descriptor

In the devio.c,

  I have added  a case to return the speed and other descriptors,

call :
 ret = usb_control_msg(pRootHub, usb_sndctrlpipe(pRootHub, 0),
               USB_REQ_CLEAR_FEATURE, USB_RT_PORT, USB_PORT_FEAT_POWER,
               port_num + 1, NULL, 0, HZ);

The above call is returning err : -32 EPIPE.

The above call is working file for the rear port while the same is not
working for the fromt port.


Anythig am I missing ? I am testing it for mass stoage device...


Any inputs ? ,,,,,

On Tue, Jun 23, 2009 at 6:57 PM, Prabhu
Chawandi<prabhu.chavandi@...il.com> wrote:
> Hi all,
>
>   I ma not able to read the USB descriptor and speeed, while I can
> read and write into the storage device..
>
> What might be the reason for that ?
>
> regards,
> Prabhu
>
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