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

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Date:	Thu, 4 Sep 2014 23:57:31 +0200
From:	Benjamin Henrion <zoobab@...il.com>
To:	Wang YanQing <udknight@...il.com>, gregkh@...uxfoundation.org,
	linus.walleij@...aro.org, Johan Hovold <jhovold@...il.com>,
	andi@...as.de, dforsi@...il.com, gnomes@...rguk.ukuu.org.uk,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benjamin Henrion <zoobab@...il.com>
Subject: Re: [PATCH v8] usb:serial:pl2303: add GPIOs interface on PL2303

On Thu, Sep 4, 2014 at 7:35 PM, Wang YanQing <udknight@...il.com> wrote:
> On Sun, Aug 31, 2014 at 11:24:56PM +0800, Wang YanQing wrote:
>> PL2303 USB Serial devices may has GPIOs, this patch add
>> basic PL2303 gpio support.
>>
>> Known issue:
>> If gpios are in use(export to userspace through sysfs interface, etc),
>> then call pl2303_release(unplug usb-serial convertor, modprobe -r, etc),
>> will cause trouble, so we need to make sure there is no gpio user before
>> call pl2303_release.
>>
>> Signed-off-by: Wang YanQing <udknight@...il.com>
>> ---
>>  Note: I sniffed office HXD gpio test program to get
>>        gpios control protocol with PL2303 RA, so I only
>>        test it with PL2303 RA and HXA, I don't have HXD,
>>        but because it is *office* HXD gpio test program,
>>        so if it doesn't work with HXD, I will feel surprise.

I can confirm your patch is working fine on the HXD:

http://www.zoobab.com/pl2303hxd-gpio

I am still hunting for a simple C program to test the speed of the
GPIOs and sysfs, if you have a good reference.

Best,

-- 
Benjamin Henrion <bhenrion at ffii.org>
FFII Brussels - +32-484-566109 - +32-2-4148403
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