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
st_press_trig_set_state(struct iio_trigger * trig,bool state)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
st_press_buffer_preenable(struct iio_dev * indio_dev)33 static int st_press_buffer_preenable(struct iio_dev *indio_dev)
34 {
35 return st_sensors_set_enable(indio_dev, true);
36 }
37
st_press_buffer_postenable(struct iio_dev * indio_dev)38 static int st_press_buffer_postenable(struct iio_dev *indio_dev)
39 {
40 int err;
41 struct st_sensor_data *press_data = iio_priv(indio_dev);
42
43 press_data->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
44 if (press_data->buffer_data == NULL) {
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:
56 kfree(press_data->buffer_data);
57 allocate_memory_error:
58 return err;
59 }
60
st_press_buffer_predisable(struct iio_dev * indio_dev)61 static int st_press_buffer_predisable(struct iio_dev *indio_dev)
62 {
63 int err;
64 struct st_sensor_data *press_data = iio_priv(indio_dev);
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:
73 kfree(press_data->buffer_data);
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
st_press_allocate_ring(struct iio_dev * indio_dev)83 int st_press_allocate_ring(struct iio_dev *indio_dev)
84 {
85 return iio_triggered_buffer_setup(indio_dev, NULL,
86 &st_sensors_trigger_handler, &st_press_buffer_setup_ops);
87 }
88
st_press_deallocate_ring(struct iio_dev * indio_dev)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");
97
