linux-kernel - Re: [PATCH V2 3/4] staging:iio:magnetometer:ak8975: Don't assume 0 is an invalid GPIO

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Date:	Fri, 02 Sep 2011 09:51:59 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Stephen Warren <swarren@...dia.com>
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	Jean Delvare <khali@...ux-fr.org>,
	Ben Dooks <ben-linux@...ff.org>, Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	Andrew Chew <achew@...dia.com>, linux-iio@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH V2 3/4] staging:iio:magnetometer:ak8975: Don't assume
 0 is an invalid GPIO

On 09/01/11 17:52, Stephen Warren wrote:
> gpio_is_valid() is the defined mechanism to determine whether a GPIO is
> valid. Use this instead of assuming that 0 is an invalid GPIO.
> 
This one is unchanged so you should probably have carried acks from v1.
Anyhow,
> Signed-off-by: Stephen Warren <swarren@...dia.com>
Acked-by: Jonathan Cameron <jic23@....ac.uk>
> ---
>  drivers/staging/iio/magnetometer/ak8975.c |   11 +++++------
>  1 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/iio/magnetometer/ak8975.c b/drivers/staging/iio/magnetometer/ak8975.c
> index 14076da..0dfdf50 100644
> --- a/drivers/staging/iio/magnetometer/ak8975.c
> +++ b/drivers/staging/iio/magnetometer/ak8975.c
> @@ -373,7 +373,7 @@ static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val)
>  	}
>  
>  	/* Wait for the conversion to complete. */
> -	if (data->eoc_gpio)
> +	if (gpio_is_valid(data->eoc_gpio))
>  		ret = wait_conversion_complete_gpio(data);
>  	else
>  		ret = wait_conversion_complete_polled(data);
> @@ -481,7 +481,7 @@ static int ak8975_probe(struct i2c_client *client,
>  
>  	/* We may not have a GPIO based IRQ to scan, that is fine, we will
>  	   poll if so */
> -	if (eoc_gpio > 0) {
> +	if (gpio_is_valid(eoc_gpio)) {
>  		err = gpio_request(eoc_gpio, "ak_8975");
>  		if (err < 0) {
>  			dev_err(&client->dev,
> @@ -497,8 +497,7 @@ static int ak8975_probe(struct i2c_client *client,
>  						eoc_gpio, err);
>  			goto exit_gpio;
>  		}
> -	} else
> -		eoc_gpio = 0;	/* No GPIO available */
> +	}
>  
>  	/* Register with IIO */
>  	indio_dev = iio_allocate_device(sizeof(*data));
> @@ -534,7 +533,7 @@ static int ak8975_probe(struct i2c_client *client,
>  exit_free_iio:
>  	iio_free_device(indio_dev);
>  exit_gpio:
> -	if (eoc_gpio)
> +	if (gpio_is_valid(eoc_gpio))
>  		gpio_free(eoc_gpio);
>  exit:
>  	return err;
> @@ -549,7 +548,7 @@ static int ak8975_remove(struct i2c_client *client)
>  	iio_device_unregister(indio_dev);
>  	iio_free_device(indio_dev);
>  
> -	if (eoc_gpio)
> +	if (gpio_is_valid(eoc_gpio))
>  		gpio_free(eoc_gpio);
>  
>  	return 0;

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