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217494e5 DC |
1 | /* |
2 | * STMicroelectronics pressures driver | |
3 | * | |
4 | * Copyright 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_pressure.h" | |
25 | ||
26 | int st_press_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 | ||
33 | static int st_press_buffer_preenable(struct iio_dev *indio_dev) | |
34 | { | |
6c0743ed | 35 | return st_sensors_set_enable(indio_dev, true); |
217494e5 DC |
36 | } |
37 | ||
38 | static int st_press_buffer_postenable(struct iio_dev *indio_dev) | |
39 | { | |
40 | int err; | |
a1dcf429 | 41 | struct st_sensor_data *press_data = iio_priv(indio_dev); |
217494e5 | 42 | |
a1dcf429 DC |
43 | press_data->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); |
44 | if (press_data->buffer_data == NULL) { | |
217494e5 DC |
45 | err = -ENOMEM; |
46 | goto allocate_memory_error; | |
47 | } | |
48 | ||
49 | err = iio_triggered_buffer_postenable(indio_dev); | |
50 | if (err < 0) | |
51 | goto st_press_buffer_postenable_error; | |
52 | ||
53 | return err; | |
54 | ||
55 | st_press_buffer_postenable_error: | |
a1dcf429 | 56 | kfree(press_data->buffer_data); |
217494e5 DC |
57 | allocate_memory_error: |
58 | return err; | |
59 | } | |
60 | ||
61 | static int st_press_buffer_predisable(struct iio_dev *indio_dev) | |
62 | { | |
63 | int err; | |
a1dcf429 | 64 | struct st_sensor_data *press_data = iio_priv(indio_dev); |
217494e5 DC |
65 | |
66 | err = iio_triggered_buffer_predisable(indio_dev); | |
67 | if (err < 0) | |
68 | goto st_press_buffer_predisable_error; | |
69 | ||
70 | err = st_sensors_set_enable(indio_dev, false); | |
71 | ||
72 | st_press_buffer_predisable_error: | |
a1dcf429 | 73 | kfree(press_data->buffer_data); |
217494e5 DC |
74 | return err; |
75 | } | |
76 | ||
77 | static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = { | |
78 | .preenable = &st_press_buffer_preenable, | |
79 | .postenable = &st_press_buffer_postenable, | |
80 | .predisable = &st_press_buffer_predisable, | |
81 | }; | |
82 | ||
83 | int st_press_allocate_ring(struct iio_dev *indio_dev) | |
84 | { | |
85 | return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
86 | &st_sensors_trigger_handler, &st_press_buffer_setup_ops); | |
87 | } | |
88 | ||
89 | void st_press_deallocate_ring(struct iio_dev *indio_dev) | |
90 | { | |
91 | iio_triggered_buffer_cleanup(indio_dev); | |
92 | } | |
93 | ||
94 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); | |
95 | MODULE_DESCRIPTION("STMicroelectronics pressures buffer"); | |
96 | MODULE_LICENSE("GPL v2"); |