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
st_accel_trig_set_state(struct iio_trigger * trig,bool state)25 int 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
st_accel_buffer_postenable(struct iio_dev * indio_dev)32 static int st_accel_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_accel_buffer_enable_all_axis;
43
44 return 0;
45
46 st_accel_buffer_enable_all_axis:
47 st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
48 return err;
49 }
50
st_accel_buffer_predisable(struct iio_dev * indio_dev)51 static int st_accel_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,
60 ST_SENSORS_ENABLE_ALL_AXIS);
61 }
62
63 static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = {
64 .postenable = &st_accel_buffer_postenable,
65 .predisable = &st_accel_buffer_predisable,
66 };
67
st_accel_allocate_ring(struct iio_dev * indio_dev)68 int st_accel_allocate_ring(struct iio_dev *indio_dev)
69 {
70 return iio_triggered_buffer_setup(indio_dev, NULL,
71 &st_sensors_trigger_handler, &st_accel_buffer_setup_ops);
72 }
73
st_accel_deallocate_ring(struct iio_dev * indio_dev)74 void st_accel_deallocate_ring(struct iio_dev *indio_dev)
75 {
76 iio_triggered_buffer_cleanup(indio_dev);
77 }
78
79 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
80 MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer");
81 MODULE_LICENSE("GPL v2");
82