linux-kernel - Re: [PATCH v2 3/3] gpio: add support for Cypress CYUSBS234 USB-GPIO adapter

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Date:	Tue, 30 Sep 2014 13:12:10 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Muthu Mani <muth@...ress.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-gpio@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rajaram Regupathy <rera@...ress.com>,
	Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v2 3/3] gpio: add support for Cypress CYUSBS234 USB-GPIO
 adapter

On Tue, Sep 30, 2014 at 01:08:29PM +0200, Johan Hovold wrote:
> On Thu, Sep 25, 2014 at 11:21:58AM +0530, Muthu Mani wrote:

> > +static int cy_gpio_direction_input(struct gpio_chip *chip,
> > +					unsigned offset)
> > +{
> > +	return 0;
> > +}
> > +
> > +static int cy_gpio_direction_output(struct gpio_chip *chip,
> > +					unsigned offset, int value)
> > +{
> > +	return 0;
> > +}
> 
> This is not a correct implementation of these. You're are supposed to
> return what direction the gpio is configured for. You should also add a
> call back to set the direction.

That was backwards; these are supposed to set the direction, and then
you should also implement the get_direction callback.

Johan
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