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

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Message-ID: <20181018125502.2hnp3s45lk6dggqt@mwanda>
Date:   Thu, 18 Oct 2018 15:55:02 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Stefan Popa <stefan.popa@...log.com>
Cc:     jic23@...nel.org, devel@...verdev.osuosl.org, lars@...afoo.de,
        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 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).

> +			ad7606_reset(st);
> +			return -EIO;
> +		}
> +
> +		data++;
> +		num--;
> +	}
> +
> +	return st->bops->read_block(st->dev, num, data);
> +}

regards,
dan carpenter