linux-kernel - Re: [PATCH v2] staging: iio: trigger: iio-trig-periodic-rtc: Change frequency type to unsigned int

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Message-ID: <54E8CA45.2010306@kernel.org>
Date:	Sat, 21 Feb 2015 18:11:17 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Hartmut Knaack <knaack.h@....de>
CC:	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joel Porquet <joel@...quet.org>,
	Darshana Padmadas <darshanapadmadas@...il.com>,
	Catalina Mocanu <catalina.mocanu@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>, linux-iio@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: iio: trigger: iio-trig-periodic-rtc: Change
 frequency type to unsigned int

On 08/02/15 18:22, Rickard Strandqvist wrote:
> Change struct iio_prtc_trigger_info frequency
> type from int to unsigned int.
> Since it is always treated as such in the driver
> so they type should probably reflect this.
> 
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
The only argument against this is that the rtc_irq_set_freq function takes
a signed int. Arguably that shouldn't perhaps, but whilst it does we should
probably track it's type to avoid confusion.

Jonathan
> ---
>  drivers/staging/iio/trigger/iio-trig-periodic-rtc.c |   12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c b/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
> index a24caf7..89df1d3 100644
> --- a/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
> +++ b/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
> @@ -24,7 +24,7 @@ static DEFINE_MUTEX(iio_prtc_trigger_list_lock);
>  
>  struct iio_prtc_trigger_info {
>  	struct rtc_device *rtc;
> -	int frequency;
> +	unsigned int frequency;
>  	struct rtc_task task;
>  	bool state;
>  };
> @@ -36,7 +36,7 @@ static int iio_trig_periodic_rtc_set_state(struct iio_trigger *trig, bool state)
>  
>  	if (trig_info->frequency == 0 && state)
>  		return -EINVAL;
> -	dev_dbg(&trig_info->rtc->dev, "trigger frequency is %d\n",
> +	dev_dbg(&trig_info->rtc->dev, "trigger frequency is %u\n",
>  			trig_info->frequency);
>  	ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, state);
>  	if (ret == 0)
> @@ -62,10 +62,10 @@ static ssize_t iio_trig_periodic_write_freq(struct device *dev,
>  {
>  	struct iio_trigger *trig = to_iio_trigger(dev);
>  	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
> -	int val;
> +	unsigned int val;
>  	int ret;
>  
> -	ret = kstrtoint(buf, 10, &val);
> +	ret = kstrtouint(buf, 10, &val);
>  	if (ret)
>  		goto error_ret;
>  
> @@ -74,10 +74,8 @@ static ssize_t iio_trig_periodic_write_freq(struct device *dev,
>  		if (ret == 0 && trig_info->state && trig_info->frequency == 0)
>  			ret = rtc_irq_set_state(trig_info->rtc,
>  						&trig_info->task, 1);
> -	} else if (val == 0) {
> -		ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, 0);
>  	} else
> -		ret = -EINVAL;
> +		ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, 0);
>  	if (ret)
>  		goto error_ret;
>  
> 

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