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872e79ad DC |
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 | ||
26 | static int st_magn_buffer_preenable(struct iio_dev *indio_dev) | |
27 | { | |
bbc1751d | 28 | return st_sensors_set_enable(indio_dev, true); |
872e79ad DC |
29 | } |
30 | ||
31 | static int st_magn_buffer_postenable(struct iio_dev *indio_dev) | |
32 | { | |
33 | int err; | |
34 | struct st_sensor_data *mdata = iio_priv(indio_dev); | |
35 | ||
36 | mdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); | |
37 | if (mdata->buffer_data == NULL) { | |
38 | err = -ENOMEM; | |
39 | goto allocate_memory_error; | |
40 | } | |
41 | ||
42 | err = iio_triggered_buffer_postenable(indio_dev); | |
43 | if (err < 0) | |
44 | goto st_magn_buffer_postenable_error; | |
45 | ||
46 | return err; | |
47 | ||
48 | st_magn_buffer_postenable_error: | |
49 | kfree(mdata->buffer_data); | |
50 | allocate_memory_error: | |
51 | return err; | |
52 | } | |
53 | ||
54 | static int st_magn_buffer_predisable(struct iio_dev *indio_dev) | |
55 | { | |
56 | int err; | |
57 | struct st_sensor_data *mdata = iio_priv(indio_dev); | |
58 | ||
59 | err = iio_triggered_buffer_predisable(indio_dev); | |
60 | if (err < 0) | |
61 | goto st_magn_buffer_predisable_error; | |
62 | ||
63 | err = st_sensors_set_enable(indio_dev, false); | |
64 | ||
65 | st_magn_buffer_predisable_error: | |
66 | kfree(mdata->buffer_data); | |
67 | return err; | |
68 | } | |
69 | ||
70 | static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = { | |
71 | .preenable = &st_magn_buffer_preenable, | |
72 | .postenable = &st_magn_buffer_postenable, | |
73 | .predisable = &st_magn_buffer_predisable, | |
74 | }; | |
75 | ||
76 | int st_magn_allocate_ring(struct iio_dev *indio_dev) | |
77 | { | |
78 | return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
79 | &st_sensors_trigger_handler, &st_magn_buffer_setup_ops); | |
80 | } | |
81 | ||
82 | void st_magn_deallocate_ring(struct iio_dev *indio_dev) | |
83 | { | |
84 | iio_triggered_buffer_cleanup(indio_dev); | |
85 | } | |
86 | ||
87 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); | |
88 | MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer"); | |
89 | MODULE_LICENSE("GPL v2"); |