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/*
* STMicroelectronics magnetometers driver
*
* Copyright 2012-2013 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*
* Licensed under the GPL-2.
*/
#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_magn.h"
static int st_magn_buffer_preenable(struct iio_dev *indio_dev)
{
int err;
err = st_sensors_set_enable(indio_dev, true);
if (err < 0)
goto st_magn_set_enable_error;
err = iio_sw_buffer_preenable(indio_dev);
st_magn_set_enable_error:
return err;
}
static int st_magn_buffer_postenable(struct iio_dev *indio_dev)
{
int err;
struct st_sensor_data *mdata = iio_priv(indio_dev);
mdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
if (mdata->buffer_data == NULL) {
err = -ENOMEM;
goto allocate_memory_error;
}
err = iio_triggered_buffer_postenable(indio_dev);
if (err < 0)
goto st_magn_buffer_postenable_error;
return err;
st_magn_buffer_postenable_error:
kfree(mdata->buffer_data);
allocate_memory_error:
return err;
}
static int st_magn_buffer_predisable(struct iio_dev *indio_dev)
{
int err;
struct st_sensor_data *mdata = iio_priv(indio_dev);
err = iio_triggered_buffer_predisable(indio_dev);
if (err < 0)
goto st_magn_buffer_predisable_error;
err = st_sensors_set_enable(indio_dev, false);
st_magn_buffer_predisable_error:
kfree(mdata->buffer_data);
return err;
}
static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = {
.preenable = &st_magn_buffer_preenable,
.postenable = &st_magn_buffer_postenable,
.predisable = &st_magn_buffer_predisable,
};
int st_magn_allocate_ring(struct iio_dev *indio_dev)
{
return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
&st_sensors_trigger_handler, &st_magn_buffer_setup_ops);
}
void st_magn_deallocate_ring(struct iio_dev *indio_dev)
{
iio_triggered_buffer_cleanup(indio_dev);
}
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer");
MODULE_LICENSE("GPL v2");
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