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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_preenable(struct iio_dev *indio_dev)
33{
34 return st_sensors_set_enable(indio_dev, true);
35}
36
37static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
38{
39 int err;
40 struct st_sensor_data *gdata = iio_priv(indio_dev);
41
42 gdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
43 if (gdata->buffer_data == NULL) {
44 err = -ENOMEM;
45 goto allocate_memory_error;
46 }
47
48 err = st_sensors_set_axis_enable(indio_dev,
49 (u8)indio_dev->active_scan_mask[0]);
50 if (err < 0)
51 goto st_gyro_buffer_postenable_error;
52
53 err = iio_triggered_buffer_postenable(indio_dev);
54 if (err < 0)
55 goto st_gyro_buffer_postenable_error;
56
57 return err;
58
59st_gyro_buffer_postenable_error:
60 kfree(gdata->buffer_data);
61allocate_memory_error:
62 return err;
63}
64
65static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
66{
67 int err;
68 struct st_sensor_data *gdata = iio_priv(indio_dev);
69
70 err = iio_triggered_buffer_predisable(indio_dev);
71 if (err < 0)
72 goto st_gyro_buffer_predisable_error;
73
74 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
75 if (err < 0)
76 goto st_gyro_buffer_predisable_error;
77
78 err = st_sensors_set_enable(indio_dev, false);
79
80st_gyro_buffer_predisable_error:
81 kfree(gdata->buffer_data);
82 return err;
83}
84
85static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
86 .preenable = &st_gyro_buffer_preenable,
87 .postenable = &st_gyro_buffer_postenable,
88 .predisable = &st_gyro_buffer_predisable,
89};
90
91int st_gyro_allocate_ring(struct iio_dev *indio_dev)
92{
93 return iio_triggered_buffer_setup(indio_dev, NULL,
94 &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
95}
96
97void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
98{
99 iio_triggered_buffer_cleanup(indio_dev);
100}
101
102MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
103MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
104MODULE_LICENSE("GPL v2");
105