1 /*
2 * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include <linux/iio/common/ssp_sensors.h>
17 #include <linux/iio/kfifo_buf.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include "ssp_iio_sensor.h"
21
22 /**
23 * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
24 *
25 * @indio_dev: iio device
26 *
27 * Returns 0 or negative value in case of error
28 */
ssp_common_buffer_postenable(struct iio_dev * indio_dev)29 int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
30 {
31 struct ssp_sensor_data *spd = iio_priv(indio_dev);
32 struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
33
34 /* the allocation is made in post because scan size is known in this
35 * moment
36 * */
37 spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
38 if (!spd->buffer)
39 return -ENOMEM;
40
41 return ssp_enable_sensor(data, spd->type,
42 ssp_get_sensor_delay(data, spd->type));
43 }
44 EXPORT_SYMBOL(ssp_common_buffer_postenable);
45
46 /**
47 * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
48 *
49 * @indio_dev: iio device
50 *
51 * Returns 0 or negative value in case of error
52 */
ssp_common_buffer_postdisable(struct iio_dev * indio_dev)53 int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
54 {
55 int ret;
56 struct ssp_sensor_data *spd = iio_priv(indio_dev);
57 struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
58
59 ret = ssp_disable_sensor(data, spd->type);
60 if (ret < 0)
61 return ret;
62
63 kfree(spd->buffer);
64
65 return ret;
66 }
67 EXPORT_SYMBOL(ssp_common_buffer_postdisable);
68
69 /**
70 * ssp_common_process_data() - Common process data callback for ssp sensors
71 *
72 * @indio_dev: iio device
73 * @buf: source buffer
74 * @len: sensor data length
75 * @timestamp: system timestamp
76 *
77 * Returns 0 or negative value in case of error
78 */
ssp_common_process_data(struct iio_dev * indio_dev,void * buf,unsigned int len,int64_t timestamp)79 int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
80 unsigned int len, int64_t timestamp)
81 {
82 __le32 time;
83 int64_t calculated_time;
84 struct ssp_sensor_data *spd = iio_priv(indio_dev);
85
86 if (indio_dev->scan_bytes == 0)
87 return 0;
88
89 /*
90 * it always sends full set of samples, remember about available masks
91 */
92 memcpy(spd->buffer, buf, len);
93
94 if (indio_dev->scan_timestamp) {
95 memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
96 calculated_time =
97 timestamp + (int64_t)le32_to_cpu(time) * 1000000;
98 }
99
100 return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
101 calculated_time);
102 }
103 EXPORT_SYMBOL(ssp_common_process_data);
104
105 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
106 MODULE_DESCRIPTION("Samsung sensorhub commons");
107 MODULE_LICENSE("GPL");
108