1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
4 */
5
6 #include <linux/iio/common/ssp_sensors.h>
7 #include <linux/iio/buffer.h>
8 #include <linux/iio/kfifo_buf.h>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/unaligned.h>
12 #include <linux/units.h>
13 #include "ssp_iio_sensor.h"
14
15 /**
16 * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
17 *
18 * @indio_dev: iio device
19 *
20 * Returns 0 or negative value in case of error
21 */
ssp_common_buffer_postenable(struct iio_dev * indio_dev)22 int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
23 {
24 struct ssp_sensor_data *spd = iio_priv(indio_dev);
25 struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
26
27 /* the allocation is made in post because scan size is known in this
28 * moment
29 * */
30 spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
31 if (!spd->buffer)
32 return -ENOMEM;
33
34 return ssp_enable_sensor(data, spd->type,
35 ssp_get_sensor_delay(data, spd->type));
36 }
37 EXPORT_SYMBOL_NS(ssp_common_buffer_postenable, "IIO_SSP_SENSORS");
38
39 /**
40 * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
41 *
42 * @indio_dev: iio device
43 *
44 * Returns 0 or negative value in case of error
45 */
ssp_common_buffer_postdisable(struct iio_dev * indio_dev)46 int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
47 {
48 int ret;
49 struct ssp_sensor_data *spd = iio_priv(indio_dev);
50 struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
51
52 ret = ssp_disable_sensor(data, spd->type);
53 if (ret < 0)
54 return ret;
55
56 kfree(spd->buffer);
57
58 return ret;
59 }
60 EXPORT_SYMBOL_NS(ssp_common_buffer_postdisable, "IIO_SSP_SENSORS");
61
62 /**
63 * ssp_common_process_data() - Common process data callback for ssp sensors
64 *
65 * @indio_dev: iio device
66 * @buf: source buffer
67 * @len: sensor data length
68 * @timestamp: system timestamp
69 *
70 * Returns 0 or negative value in case of error
71 */
ssp_common_process_data(struct iio_dev * indio_dev,void * buf,unsigned int len,int64_t timestamp)72 int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
73 unsigned int len, int64_t timestamp)
74 {
75 int64_t calculated_time;
76 struct ssp_sensor_data *spd = iio_priv(indio_dev);
77
78 if (indio_dev->scan_bytes == 0)
79 return 0;
80
81 /*
82 * it always sends full set of samples, remember about available masks
83 */
84 memcpy(spd->buffer, buf, len);
85
86 calculated_time = timestamp +
87 (int64_t)get_unaligned_le32(buf + len) * MEGA;
88
89 return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
90 calculated_time);
91 }
92 EXPORT_SYMBOL_NS(ssp_common_process_data, "IIO_SSP_SENSORS");
93
94 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
95 MODULE_DESCRIPTION("Samsung sensorhub commons");
96 MODULE_LICENSE("GPL");
97 MODULE_IMPORT_NS("IIO_SSP_SENSORS");
98