// SPDX-License-Identifier: GPL-2.0-only
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/*
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* STMicroelectronics sensors buffer library driver
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*
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* Copyright 2012-2013 STMicroelectronics Inc.
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*
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* Denis Ciocca <denis.ciocca@st.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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#include <linux/interrupt.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/irqreturn.h>
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#include <linux/regmap.h>
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#include <linux/iio/common/st_sensors.h>
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static int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
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{
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struct st_sensor_data *sdata = iio_priv(indio_dev);
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unsigned int num_data_channels = sdata->num_data_channels;
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int i;
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for_each_set_bit(i, indio_dev->active_scan_mask, num_data_channels) {
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const struct iio_chan_spec *channel = &indio_dev->channels[i];
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unsigned int bytes_to_read =
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DIV_ROUND_UP(channel->scan_type.realbits +
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channel->scan_type.shift, 8);
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unsigned int storage_bytes =
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channel->scan_type.storagebits >> 3;
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buf = PTR_ALIGN(buf, storage_bytes);
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if (regmap_bulk_read(sdata->regmap, channel->address,
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buf, bytes_to_read) < 0)
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return -EIO;
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/* Advance the buffer pointer */
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buf += storage_bytes;
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}
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return 0;
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}
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irqreturn_t st_sensors_trigger_handler(int irq, void *p)
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{
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int len;
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct st_sensor_data *sdata = iio_priv(indio_dev);
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s64 timestamp;
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/*
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* If we do timetamping here, do it before reading the values, because
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* once we've read the values, new interrupts can occur (when using
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* the hardware trigger) and the hw_timestamp may get updated.
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* By storing it in a local variable first, we are safe.
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*/
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if (iio_trigger_using_own(indio_dev))
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timestamp = sdata->hw_timestamp;
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else
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timestamp = iio_get_time_ns(indio_dev);
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len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data);
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if (len < 0)
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goto st_sensors_get_buffer_element_error;
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iio_push_to_buffers_with_timestamp(indio_dev, sdata->buffer_data,
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timestamp);
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st_sensors_get_buffer_element_error:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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EXPORT_SYMBOL(st_sensors_trigger_handler);
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MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer");
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MODULE_LICENSE("GPL v2");
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