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
26int 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
33static int st_press_buffer_preenable(struct iio_dev *indio_dev)
34{
35	return st_sensors_set_enable(indio_dev, true);
36}
37
38static 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
55st_press_buffer_postenable_error:
56	kfree(press_data->buffer_data);
57allocate_memory_error:
58	return err;
59}
60
61static 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
72st_press_buffer_predisable_error:
73	kfree(press_data->buffer_data);
74	return err;
75}
76
77static 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
83int 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
89void st_press_deallocate_ring(struct iio_dev *indio_dev)
90{
91	iio_triggered_buffer_cleanup(indio_dev);
92}
93
94MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
95MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
96MODULE_LICENSE("GPL v2");
97