tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * STMicroelectronics accelerometers 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_accel.h"
25
26int st_accel_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
33static int st_accel_buffer_preenable(struct iio_dev *indio_dev)
34{
35 int err;
36
37 err = st_sensors_set_enable(indio_dev, true);
38 if (err < 0)
39 goto st_accel_set_enable_error;
40
41 err = iio_sw_buffer_preenable(indio_dev);
42
43st_accel_set_enable_error:
44 return err;
45}
46
47static int st_accel_buffer_postenable(struct iio_dev *indio_dev)
48{
49 int err;
50 struct st_sensor_data *adata = iio_priv(indio_dev);
51
52 adata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
53 if (adata->buffer_data == NULL) {
54 err = -ENOMEM;
55 goto allocate_memory_error;
56 }
57
58 err = st_sensors_set_axis_enable(indio_dev,
59 (u8)indio_dev->active_scan_mask[0]);
60 if (err < 0)
61 goto st_accel_buffer_postenable_error;
62
63 err = iio_triggered_buffer_postenable(indio_dev);
64 if (err < 0)
65 goto st_accel_buffer_postenable_error;
66
67 return err;
68
69st_accel_buffer_postenable_error:
70 kfree(adata->buffer_data);
71allocate_memory_error:
72 return err;
73}
74
75static int st_accel_buffer_predisable(struct iio_dev *indio_dev)
76{
77 int err;
78 struct st_sensor_data *adata = iio_priv(indio_dev);
79
80 err = iio_triggered_buffer_predisable(indio_dev);
81 if (err < 0)
82 goto st_accel_buffer_predisable_error;
83
84 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
85 if (err < 0)
86 goto st_accel_buffer_predisable_error;
87
88 err = st_sensors_set_enable(indio_dev, false);
89
90st_accel_buffer_predisable_error:
91 kfree(adata->buffer_data);
92 return err;
93}
94
95static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = {
96 .preenable = &st_accel_buffer_preenable,
97 .postenable = &st_accel_buffer_postenable,
98 .predisable = &st_accel_buffer_predisable,
99};
100
101int st_accel_allocate_ring(struct iio_dev *indio_dev)
102{
103 return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
104 &st_sensors_trigger_handler, &st_accel_buffer_setup_ops);
105}
106
107void st_accel_deallocate_ring(struct iio_dev *indio_dev)
108{
109 iio_triggered_buffer_cleanup(indio_dev);
110}
111
112MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
113MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer");
114MODULE_LICENSE("GPL v2");