linux-kernel - Re: [PATCH 6/6] twl4030-usb: Don't report EVENT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120425080526.GA3777@arwen.pp.htv.fi>
Date:	Wed, 25 Apr 2012 11:05:27 +0300
From:	Felipe Balbi <balbi@...com>
To:	NeilBrown <neilb@...e.de>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, Felipe Balbi <balbi@...com>,
	Grazvydas Ignotas <notasas@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 6/6] twl4030-usb: Don't report EVENT_ID when there is
 VBUS.

Hi,

On Wed, Apr 25, 2012 at 05:33:11PM +1000, NeilBrown wrote:
> Some USB chargers tie the ID pin low via various resistors.
> So they can cause VBUS to be high and ID to be low.
> 
> The 'A' end of an OTG cable never receives VBUS, it only ever generates it.

this isn't entirely true. Have you considered Accessory Charger
Adapters ?

> So if we see VBUS and are not generating it, this must be a charger,
> not the A end of an OTG cable, so in that case, ignore the fact that
> ID is low.

wrong.

-- 
balbi

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)