linux-kernel - Re: [PATCH v8] usb:serial:pl2303: add GPIOs interface on PL2303

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Message-ID: <20140905013011.GA2133@udknight>
Date:	Fri, 5 Sep 2014 09:30:11 +0800
From:	Wang YanQing <udknight@...il.com>
To:	Benjamin Henrion <zoobab@...il.com>
Cc:	gregkh@...uxfoundation.org, linus.walleij@...aro.org,
	jhovold@...il.com, andi@...as.de, dforsi@...il.com,
	gnomes@...rguk.ukuu.org.uk, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8] usb:serial:pl2303: add GPIOs interface on PL2303

On Thu, Sep 04, 2014 at 06:44:31PM +0200, Benjamin Henrion wrote:
> On Thu, Sep 4, 2014 at 6:14 PM, Benjamin Henrion <zoobab@...il.com> wrote:
> > I have subscribed to the lkml.
> >
> > Can you make me a favour, send me your email as you posted on the LKML
> > in mbox format attached to an email?
> >
> > I am trying to reply to it, but I cannot find an mbox archive, outside
> > of gmane which rewrites all the email addresses.
> >
> > Otherwise, I made a page here:
> >
> > http://www.zoobab.com/pl2303hxd-gpio
> >
> > I will also try with other adapters to see if the 2 GPIOs show up.
> >
> > Any idea how to test the GPIO sysfs speed?
> 
> Also tested with an HXA laying around, I could export the 2 GPIOS in
> /sys/class/gpio, but I could not change the status of the pins via
> echo.
> 
> Any idea why?

It is strange, I have tested again with my two HXA adapters, they work well.
How do you test? check cat value or check voltage change? I check cat value,
and they work good.


> 
> -- 
> Benjamin Henrion <bhenrion at ffii.org>
> FFII Brussels - +32-484-566109 - +32-2-4148403
> "In July 2005, after several failed attempts to legalise software
> patents in Europe, the patent establishment changed its strategy.
> Instead of explicitly seeking to sanction the patentability of
> software, they are now seeking to create a central European patent
> court, which would establish and enforce patentability rules in their
> favor, without any possibility of correction by competing courts or
> democratically elected legislators."
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