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From: Greg KH <gregkh@linuxfoundation.org>
To: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Wang YanQing <udknight@gmail.com>,
	linus.walleij@linaro.org, jhovold@gmail.com,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] usb:serial:pl2303: add GPIOs interface on PL2303
Date: Wed, 23 Jul 2014 09:21:29 -0700	[thread overview]
Message-ID: <20140723162129.GB6871@kroah.com> (raw)
In-Reply-To: <20140723170314.23864779@alan.etchedpixels.co.uk>

On Wed, Jul 23, 2014 at 05:03:14PM +0100, One Thousand Gnomes wrote:
> > +		if (gpiochip_remove(&spriv->gpio->gpio_chip))
> > +			dev_err(&serial->interface->dev, "unable to remove gpio_chip?\n");
> > +		kfree(spriv->gpio);
> > +	}
> > +#endif
> >  	kfree(spriv);
> 
> Only other question I have - if I have multiple PL2303HX adapters how
> will I work out which GPIO lines belong to which /dev/ttyUSB* interface ?

sysfs _should_ show you this, as it should point to the "parent" device,
which will be associated with the ttyUSB interface.  Well, both the tty
device and the gpio device will have the same parent, is that good
enough to determine this, or should the gpio device have the tty device
as its parent?

thanks,

greg k-h

  reply	other threads:[~2014-07-23 16:21 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-20  6:38 [PATCH v2] usb:serial:pl2303: add GPIOs interface on PL2303 Wang YanQing
2014-07-20  9:19 ` Daniele Forsi
2014-07-23 16:03 ` One Thousand Gnomes
2014-07-23 16:21   ` Greg KH [this message]
2014-07-24  9:34     ` One Thousand Gnomes

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