linux-kernel - Re: [PATCH 1/2] staging: iio: ad7606: Move out of staging

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Date:   Thu, 18 Oct 2018 19:19:36 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Stefan Popa <stefan.popa@...log.com>
Cc:     jic23@...nel.org, devel@...verdev.osuosl.org,
        Michael.Hennerich@...log.com, linux-iio@...r.kernel.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        pmeerw@...erw.net, knaack.h@....de
Subject: Re: [PATCH 1/2] staging: iio: ad7606: Move out of staging

On 10/18/2018 02:55 PM, Dan Carpenter wrote:
> On Thu, Oct 18, 2018 at 12:10:32PM +0300, Stefan Popa wrote:
>> +static int ad7606_read_samples(struct ad7606_state *st)
>> +{
>> +	unsigned int num = st->chip_info->num_channels;
>> +	u16 *data = st->data;
>> +	int ret;
>> +
>> +	/*
>> +	 * The frstdata signal is set to high while and after reading the sample
>> +	 * of the first channel and low for all other channels. This can be used
>> +	 * to check that the incoming data is correctly aligned. During normal
>> +	 * operation the data should never become unaligned, but some glitch or
>> +	 * electrostatic discharge might cause an extra read or clock cycle.
>> +	 * Monitoring the frstdata signal allows to recover from such failure
>> +	 * situations.
>> +	 */
>> +
>> +	if (st->gpio_frstdata) {
>> +		ret = st->bops->read_block(st->dev, 1, data);
>> +		if (ret)
>> +			return ret;
>> +
>> +		if (!gpiod_get_value(st->gpio_frstdata)) {
> 
> This check should maybe be:
> 
> 		if (gpiod_get_value(st->gpio_frstdata) <= 0) {
> 
> (Or possibly not, I don't know the code very well).

gpiod_get_value() is only allowed to return either 0 or 1.