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// SPDX-License-Identifier: GPL-2.0-only
/*
* STMicroelectronics pressures driver
*
* Copyright 2013 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/common/st_sensors.h>
#include "st_pressure.h"
int st_press_trig_set_state(struct iio_trigger *trig, bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
return st_sensors_set_dataready_irq(indio_dev, state);
}
static int st_press_buffer_postenable(struct iio_dev *indio_dev)
{
struct st_sensor_data *press_data = iio_priv(indio_dev);
int err;
press_data->buffer_data = kmalloc(indio_dev->scan_bytes,
GFP_DMA | GFP_KERNEL);
if (!press_data->buffer_data)
return -ENOMEM;
err = iio_triggered_buffer_postenable(indio_dev);
if (err < 0)
goto st_press_free_buffer;
err = st_sensors_set_enable(indio_dev, true);
if (err < 0)
goto st_press_buffer_predisable;
return 0;
st_press_buffer_predisable:
iio_triggered_buffer_predisable(indio_dev);
st_press_free_buffer:
kfree(press_data->buffer_data);
return err;
}
static int st_press_buffer_predisable(struct iio_dev *indio_dev)
{
struct st_sensor_data *press_data = iio_priv(indio_dev);
int err, err2;
err = st_sensors_set_enable(indio_dev, false);
err2 = iio_triggered_buffer_predisable(indio_dev);
if (!err)
err = err2;
kfree(press_data->buffer_data);
return err;
}
static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
.postenable = &st_press_buffer_postenable,
.predisable = &st_press_buffer_predisable,
};
int st_press_allocate_ring(struct iio_dev *indio_dev)
{
return iio_triggered_buffer_setup(indio_dev, NULL,
&st_sensors_trigger_handler, &st_press_buffer_setup_ops);
}
void st_press_deallocate_ring(struct iio_dev *indio_dev)
{
iio_triggered_buffer_cleanup(indio_dev);
}
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
MODULE_LICENSE("GPL v2");
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