linux-kernel - Re: [PATCH 4/6] iio: chemical: ens160: add triggered buffer support

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Date: Mon, 13 May 2024 21:13:07 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Gustavo Silva <gustavograzs@...il.com>, jic23@...nel.org
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 lars@...afoo.de, gerald.loacker@...fvision.net, devicetree@...r.kernel.org,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] iio: chemical: ens160: add triggered buffer support

Le 12/05/2024 à 23:04, Gustavo Silva a écrit :
> ENS160 supports a data ready interrupt. Use it in combination with
> triggered buffer for continuous data readings.
> 
> Signed-off-by: Gustavo Silva <gustavograzs-Re5JQEeQqe8AvxtiuMwx3w@...lic.gmane.org>
> ---

..

> +static irqreturn_t ens160_trigger_handler(int irq, void *p)
> +{
> +	struct iio_poll_func *pf = p;
> +	struct iio_dev *indio_dev = pf->indio_dev;
> +	struct ens160_data *data = iio_priv(indio_dev);
> +	__le16 val;
> +	int ret, i, j = 0;
> +
> +	mutex_lock(&data->mutex);
> +
> +	for_each_set_bit(i, indio_dev->active_scan_mask,
> +			 indio_dev->masklength) {
> +		ret = regmap_bulk_read(data->regmap,
> +				       ENS160_REG_DATA_TVOC + 2 * i, &val, 2U);
> +		if (ret)
> +			goto err;
> +
> +		data->scan.chans[j++] = val;

Is it safe? How can we know if it has been only *partly* updated? Does 
it matter to know?

CJ

> +	}
> +
> +	iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
> +					   pf->timestamp);
> +err:
> +	mutex_unlock(&data->mutex);
> +	iio_trigger_notify_done(indio_dev->trig);
> +
> +	return IRQ_HANDLED;
> +}

..