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 {
35 	int err;
36 
37 	err = st_sensors_set_enable(indio_dev, true);
38 	if (err < 0)
39 		goto st_press_set_enable_error;
40 
41 	err = iio_sw_buffer_preenable(indio_dev);
42 
43 st_press_set_enable_error:
44 	return err;
45 }
46 
47 static int st_press_buffer_postenable(struct iio_dev *indio_dev)
48 {
49 	int err;
50 	struct st_sensor_data *pdata = iio_priv(indio_dev);
51 
52 	pdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
53 	if (pdata->buffer_data == NULL) {
54 		err = -ENOMEM;
55 		goto allocate_memory_error;
56 	}
57 
58 	err = iio_triggered_buffer_postenable(indio_dev);
59 	if (err < 0)
60 		goto st_press_buffer_postenable_error;
61 
62 	return err;
63 
64 st_press_buffer_postenable_error:
65 	kfree(pdata->buffer_data);
66 allocate_memory_error:
67 	return err;
68 }
69 
70 static int st_press_buffer_predisable(struct iio_dev *indio_dev)
71 {
72 	int err;
73 	struct st_sensor_data *pdata = iio_priv(indio_dev);
74 
75 	err = iio_triggered_buffer_predisable(indio_dev);
76 	if (err < 0)
77 		goto st_press_buffer_predisable_error;
78 
79 	err = st_sensors_set_enable(indio_dev, false);
80 
81 st_press_buffer_predisable_error:
82 	kfree(pdata->buffer_data);
83 	return err;
84 }
85 
86 static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
87 	.preenable = &st_press_buffer_preenable,
88 	.postenable = &st_press_buffer_postenable,
89 	.predisable = &st_press_buffer_predisable,
90 };
91 
92 int st_press_allocate_ring(struct iio_dev *indio_dev)
93 {
94 	return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
95 		&st_sensors_trigger_handler, &st_press_buffer_setup_ops);
96 }
97 
98 void st_press_deallocate_ring(struct iio_dev *indio_dev)
99 {
100 	iio_triggered_buffer_cleanup(indio_dev);
101 }
102 
103 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
104 MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
105 MODULE_LICENSE("GPL v2");
106