1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * STMicroelectronics gyroscopes driver
 4 *
 5 * Copyright 2012-2013 STMicroelectronics Inc.
 6 *
 7 * Denis Ciocca <denis.ciocca@st.com>
 8 */
 9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/stat.h>
14#include <linux/interrupt.h>
15#include <linux/i2c.h>
16#include <linux/delay.h>
17#include <linux/iio/iio.h>
18#include <linux/iio/buffer.h>
19#include <linux/iio/trigger_consumer.h>
20#include <linux/iio/triggered_buffer.h>
21
22#include <linux/iio/common/st_sensors.h>
23#include "st_gyro.h"
24
25int st_gyro_trig_set_state(struct iio_trigger *trig, bool state)
26{
27	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
28
29	return st_sensors_set_dataready_irq(indio_dev, state);
30}
31
32static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
33{
34	int err;
35
36	err = st_sensors_set_axis_enable(indio_dev, indio_dev->active_scan_mask[0]);
37	if (err < 0)
38		return err;
39
40	err = st_sensors_set_enable(indio_dev, true);
41	if (err < 0)
42		goto st_gyro_buffer_enable_all_axis;
43
44	return 0;
45
46st_gyro_buffer_enable_all_axis:
47	st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
48	return err;
49}
50
51static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
52{
53	int err;
54
55	err = st_sensors_set_enable(indio_dev, false);
56	if (err < 0)
57		return err;
58
59	return st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
60}
61
62static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
63	.postenable = &st_gyro_buffer_postenable,
64	.predisable = &st_gyro_buffer_predisable,
65};
66
67int st_gyro_allocate_ring(struct iio_dev *indio_dev)
68{
69	return iio_triggered_buffer_setup(indio_dev, NULL,
70		&st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
71}
72
73void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
74{
75	iio_triggered_buffer_cleanup(indio_dev);
76}
77
78MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
79MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
80MODULE_LICENSE("GPL v2");