linux-kernel - Re: [PATCH 5/8] minnowboard-gpio: Export MinnowBoard expansion GPIO

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Message-ID: <1372233328.24799.48.camel@smile>
Date:	Wed, 26 Jun 2013 10:55:28 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Darren Hart <dvhart@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, peter.p.waskiewicz.jr@...el.com,
	danders@...cuitco.com, vishal.l.verma@...el.com,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Grant Likely <grant.likely@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 5/8] minnowboard-gpio: Export MinnowBoard expansion GPIO

On Tue, 2013-06-25 at 18:53 -0700, Darren Hart wrote: 
> Request and export the user-configurable GPIO lines to sysfs. This provides a
> label readable in /debugfs/gpio and a simple interface for experimenting with
> GPIO on the MinnowBoard.
> 
> This is separate from the minnowboard driver to provide users with the
> flexibility to write kernel drivers for their own devices using these GPIO
> lines.

Few comments below.

> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -35,6 +35,24 @@ config MINNOWBOARD
>  
>  	  If you have a MinnowBoard, say Y or M here.
>  
> +if MINNOWBOARD
> +config MINNOWBOARD_GPIO
> +	tristate "MinnowBoard Expansion GPIO"
> +	depends on MINNOWBOARD
> +	default n

Like you already had been told you don't need to have default n.

> --- /dev/null
> +++ b/drivers/platform/x86/minnowboard-gpio.c

> +#include <linux/platform_device.h>
> +#include <linux/module.h>
> +#include <linux/gpio.h>
> +#include <linux/gpio_keys.h>
> +#include <linux/input.h>
> +#include <linux/minnowboard.h>

+ empty line here?

> +#include "minnowboard-gpio.h"

> +static int __init minnow_gpio_module_init(void)
> +{
> +	int err;
> +
> +	err = -ENODEV;
> +	if (!minnow_detect())
> +		goto out;
> +
> +#ifdef MODULE
> +#ifdef CONFIG_MINNOWBOARD_MODULE

And less ifdefs with IS_MODULE().

> +	if (request_module("minnowboard"))
> +		goto out;
> +#endif
> +#endif
> +
> +	/* Auxillary Expansion GPIOs */
> +	if (!minnow_lvds_detect()) {
> +		pr_debug("LVDS_DETECT not asserted, configuring Aux GPIO lines\n");
> +		err = gpio_request_array(expansion_aux_gpios,
> +					 ARRAY_SIZE(expansion_aux_gpios));
> +		if (err) {
> +			pr_err("Failed to request expansion aux GPIO lines\n");
> +			goto out;
> +		}
> +	} else {
> +		pr_debug("LVDS_DETECT asserted, ignoring aux GPIO lines\n");
> +	}
> +
> +	/* Expansion GPIOs */
> +	err = gpio_request_array(expansion_gpios, ARRAY_SIZE(expansion_gpios));
> +	if (err) {
> +		pr_err("Failed to request expansion GPIO lines\n");
> +		if (minnow_lvds_detect())
> +			gpio_free_array(expansion_aux_gpios,
> +					ARRAY_SIZE(expansion_aux_gpios));
> +		goto out;
> +	}
> +
> + out:
> +	return err;

Are you planning to add something else to 'out' path?
Otherwise I think it will look better if you do return instead of
[useless] gotos.


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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