linux-kernel - Re: [PATCH v2] usb:serial:pl2303: add GPIOs interface on PL2303

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Message-ID: <20140723162129.GB6871@kroah.com>
Date:	Wed, 23 Jul 2014 09:21:29 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Wang YanQing <udknight@...il.com>, linus.walleij@...aro.org,
	jhovold@...il.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb:serial:pl2303: add GPIOs interface on PL2303

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
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