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Message-ID: <b8775460-5519-4294-9218-d8e814e05305@wanadoo.fr>
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;
> +}
..
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