tjh.dev
Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * STMicroelectronics accelerometers 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_accel.h"
24
25int st_accel_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_accel_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_axis_enable(indio_dev, indio_dev->active_scan_mask[0]);
41 if (err < 0)
42 goto st_accel_buffer_predisable;
43
44 err = st_sensors_set_enable(indio_dev, true);
45 if (err < 0)
46 goto st_accel_buffer_enable_all_axis;
47
48 return 0;
49
50st_accel_buffer_enable_all_axis:
51 st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
52st_accel_buffer_predisable:
53 iio_triggered_buffer_predisable(indio_dev);
54 return err;
55}
56
57static int st_accel_buffer_predisable(struct iio_dev *indio_dev)
58{
59 int err, err2;
60
61 err = st_sensors_set_enable(indio_dev, false);
62 if (err < 0)
63 goto st_accel_buffer_predisable;
64
65 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
66
67st_accel_buffer_predisable:
68 err2 = iio_triggered_buffer_predisable(indio_dev);
69 if (!err)
70 err = err2;
71
72 return err;
73}
74
75static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = {
76 .postenable = &st_accel_buffer_postenable,
77 .predisable = &st_accel_buffer_predisable,
78};
79
80int st_accel_allocate_ring(struct iio_dev *indio_dev)
81{
82 return iio_triggered_buffer_setup(indio_dev, NULL,
83 &st_sensors_trigger_handler, &st_accel_buffer_setup_ops);
84}
85
86void st_accel_deallocate_ring(struct iio_dev *indio_dev)
87{
88 iio_triggered_buffer_cleanup(indio_dev);
89}
90
91MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
92MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer");
93MODULE_LICENSE("GPL v2");