]>
Commit | Line | Data |
---|---|---|
7be56a8f DC |
1 | /* |
2 | * STMicroelectronics gyroscopes 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_gyro.h" | |
25 | ||
26 | int st_gyro_trig_set_state(struct iio_trigger *trig, bool state) | |
27 | { | |
1e9663c6 | 28 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
7be56a8f DC |
29 | |
30 | return st_sensors_set_dataready_irq(indio_dev, state); | |
31 | } | |
32 | ||
33 | static int st_gyro_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_gyro_set_enable_error; | |
40 | ||
41 | err = iio_sw_buffer_preenable(indio_dev); | |
42 | ||
43 | st_gyro_set_enable_error: | |
44 | return err; | |
45 | } | |
46 | ||
47 | static int st_gyro_buffer_postenable(struct iio_dev *indio_dev) | |
48 | { | |
49 | int err; | |
50 | struct st_sensor_data *gdata = iio_priv(indio_dev); | |
51 | ||
52 | gdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); | |
53 | if (gdata->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_gyro_buffer_postenable_error; | |
62 | ||
63 | err = iio_triggered_buffer_postenable(indio_dev); | |
64 | if (err < 0) | |
65 | goto st_gyro_buffer_postenable_error; | |
66 | ||
67 | return err; | |
68 | ||
69 | st_gyro_buffer_postenable_error: | |
70 | kfree(gdata->buffer_data); | |
71 | allocate_memory_error: | |
72 | return err; | |
73 | } | |
74 | ||
75 | static int st_gyro_buffer_predisable(struct iio_dev *indio_dev) | |
76 | { | |
77 | int err; | |
78 | struct st_sensor_data *gdata = iio_priv(indio_dev); | |
79 | ||
80 | err = iio_triggered_buffer_predisable(indio_dev); | |
81 | if (err < 0) | |
82 | goto st_gyro_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_gyro_buffer_predisable_error; | |
87 | ||
88 | err = st_sensors_set_enable(indio_dev, false); | |
89 | ||
90 | st_gyro_buffer_predisable_error: | |
91 | kfree(gdata->buffer_data); | |
92 | return err; | |
93 | } | |
94 | ||
95 | static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = { | |
96 | .preenable = &st_gyro_buffer_preenable, | |
97 | .postenable = &st_gyro_buffer_postenable, | |
98 | .predisable = &st_gyro_buffer_predisable, | |
99 | }; | |
100 | ||
101 | int st_gyro_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_gyro_buffer_setup_ops); | |
105 | } | |
106 | ||
107 | void st_gyro_deallocate_ring(struct iio_dev *indio_dev) | |
108 | { | |
109 | iio_triggered_buffer_cleanup(indio_dev); | |
110 | } | |
111 | ||
112 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); | |
113 | MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer"); | |
114 | MODULE_LICENSE("GPL v2"); |