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

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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@xxxxxxxxxxxxxxxx>
---

...

+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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