1 /*
2 * STMicroelectronics magnetometers driver
3 *
4 * Copyright 2012-2013 STMicroelectronics Inc.
5 *
6 * Denis Ciocca <denis.ciocca@st.com>
7 *
8 * Licensed under the GPL-2.
9 */
10
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/stat.h>
15 #include <linux/interrupt.h>
16 #include <linux/i2c.h>
17 #include <linux/delay.h>
18 #include <linux/iio/iio.h>
19 #include <linux/iio/buffer.h>
20 #include <linux/iio/trigger_consumer.h>
21 #include <linux/iio/triggered_buffer.h>
22
23 #include <linux/iio/common/st_sensors.h>
24 #include "st_magn.h"
25
st_magn_trig_set_state(struct iio_trigger * trig,bool state)26 int st_magn_trig_set_state(struct iio_trigger *trig, bool state)
27 {
28 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
29
30 return st_sensors_set_dataready_irq(indio_dev, state);
31 }
32
st_magn_buffer_postenable(struct iio_dev * indio_dev)33 static int st_magn_buffer_postenable(struct iio_dev *indio_dev)
34 {
35 int err;
36 struct st_sensor_data *mdata = iio_priv(indio_dev);
37
38 mdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
39 if (mdata->buffer_data == NULL) {
40 err = -ENOMEM;
41 goto allocate_memory_error;
42 }
43
44 err = iio_triggered_buffer_postenable(indio_dev);
45 if (err < 0)
46 goto st_magn_buffer_postenable_error;
47
48 return st_sensors_set_enable(indio_dev, true);
49
50 st_magn_buffer_postenable_error:
51 kfree(mdata->buffer_data);
52 allocate_memory_error:
53 return err;
54 }
55
st_magn_buffer_predisable(struct iio_dev * indio_dev)56 static int st_magn_buffer_predisable(struct iio_dev *indio_dev)
57 {
58 int err;
59 struct st_sensor_data *mdata = iio_priv(indio_dev);
60
61 err = st_sensors_set_enable(indio_dev, false);
62 if (err < 0)
63 goto st_magn_buffer_predisable_error;
64
65 err = iio_triggered_buffer_predisable(indio_dev);
66
67 st_magn_buffer_predisable_error:
68 kfree(mdata->buffer_data);
69 return err;
70 }
71
72 static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = {
73 .postenable = &st_magn_buffer_postenable,
74 .predisable = &st_magn_buffer_predisable,
75 };
76
st_magn_allocate_ring(struct iio_dev * indio_dev)77 int st_magn_allocate_ring(struct iio_dev *indio_dev)
78 {
79 return iio_triggered_buffer_setup(indio_dev, NULL,
80 &st_sensors_trigger_handler, &st_magn_buffer_setup_ops);
81 }
82
st_magn_deallocate_ring(struct iio_dev * indio_dev)83 void st_magn_deallocate_ring(struct iio_dev *indio_dev)
84 {
85 iio_triggered_buffer_cleanup(indio_dev);
86 }
87
88 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
89 MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer");
90 MODULE_LICENSE("GPL v2");
91