1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * STMicroelectronics pressures driver
4  *
5  * Copyright 2013 STMicroelectronics Inc.
6  *
7  * Denis Ciocca <denis.ciocca@st.com>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/stat.h>
14 #include <linux/interrupt.h>
15 #include <linux/i2c.h>
16 #include <linux/delay.h>
17 #include <linux/iio/iio.h>
18 #include <linux/iio/buffer.h>
19 #include <linux/iio/trigger_consumer.h>
20 #include <linux/iio/triggered_buffer.h>
21 
22 #include <linux/iio/common/st_sensors.h>
23 #include "st_pressure.h"
24 
25 int st_press_trig_set_state(struct iio_trigger *trig, bool state)
26 {
27 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
28 
29 	return st_sensors_set_dataready_irq(indio_dev, state);
30 }
31 
32 static int st_press_buffer_preenable(struct iio_dev *indio_dev)
33 {
34 	return st_sensors_set_enable(indio_dev, true);
35 }
36 
37 static int st_press_buffer_postenable(struct iio_dev *indio_dev)
38 {
39 	int err;
40 	struct st_sensor_data *press_data = iio_priv(indio_dev);
41 
42 	press_data->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
43 	if (press_data->buffer_data == NULL) {
44 		err = -ENOMEM;
45 		goto allocate_memory_error;
46 	}
47 
48 	err = iio_triggered_buffer_postenable(indio_dev);
49 	if (err < 0)
50 		goto st_press_buffer_postenable_error;
51 
52 	return err;
53 
54 st_press_buffer_postenable_error:
55 	kfree(press_data->buffer_data);
56 allocate_memory_error:
57 	return err;
58 }
59 
60 static int st_press_buffer_predisable(struct iio_dev *indio_dev)
61 {
62 	int err;
63 	struct st_sensor_data *press_data = iio_priv(indio_dev);
64 
65 	err = iio_triggered_buffer_predisable(indio_dev);
66 	if (err < 0)
67 		goto st_press_buffer_predisable_error;
68 
69 	err = st_sensors_set_enable(indio_dev, false);
70 
71 st_press_buffer_predisable_error:
72 	kfree(press_data->buffer_data);
73 	return err;
74 }
75 
76 static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
77 	.preenable = &st_press_buffer_preenable,
78 	.postenable = &st_press_buffer_postenable,
79 	.predisable = &st_press_buffer_predisable,
80 };
81 
82 int st_press_allocate_ring(struct iio_dev *indio_dev)
83 {
84 	return iio_triggered_buffer_setup(indio_dev, NULL,
85 		&st_sensors_trigger_handler, &st_press_buffer_setup_ops);
86 }
87 
88 void st_press_deallocate_ring(struct iio_dev *indio_dev)
89 {
90 	iio_triggered_buffer_cleanup(indio_dev);
91 }
92 
93 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
94 MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
95 MODULE_LICENSE("GPL v2");
96