tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * STMicroelectronics magnetometers 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_magn.h"
24
25int st_magn_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_magn_buffer_postenable(struct iio_dev *indio_dev)
33{
34 int err;
35
36 err = iio_triggered_buffer_postenable(indio_dev);
37 if (err < 0)
38 return err;
39
40 err = st_sensors_set_enable(indio_dev, true);
41 if (err < 0)
42 goto st_magn_buffer_predisable;
43
44 return 0;
45
46st_magn_buffer_predisable:
47 iio_triggered_buffer_predisable(indio_dev);
48 return err;
49}
50
51static int st_magn_buffer_predisable(struct iio_dev *indio_dev)
52{
53 int err, err2;
54
55 err = st_sensors_set_enable(indio_dev, false);
56
57 err2 = iio_triggered_buffer_predisable(indio_dev);
58 if (!err)
59 err = err2;
60
61 return err;
62}
63
64static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = {
65 .postenable = &st_magn_buffer_postenable,
66 .predisable = &st_magn_buffer_predisable,
67};
68
69int st_magn_allocate_ring(struct iio_dev *indio_dev)
70{
71 return iio_triggered_buffer_setup(indio_dev, NULL,
72 &st_sensors_trigger_handler, &st_magn_buffer_setup_ops);
73}
74
75void st_magn_deallocate_ring(struct iio_dev *indio_dev)
76{
77 iio_triggered_buffer_cleanup(indio_dev);
78}
79
80MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
81MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer");
82MODULE_LICENSE("GPL v2");