/*
|
* 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"
|
|
int st_magn_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_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 st_sensors_set_enable(indio_dev, true);
|
|
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 = st_sensors_set_enable(indio_dev, false);
|
if (err < 0)
|
goto st_magn_buffer_predisable_error;
|
|
err = iio_triggered_buffer_predisable(indio_dev);
|
|
st_magn_buffer_predisable_error:
|
kfree(mdata->buffer_data);
|
return err;
|
}
|
|
static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = {
|
.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, NULL,
|
&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");
|
