ssp_iio.c

 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 */
22int 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}
37EXPORT_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 */
46int 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}
60EXPORT_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 */
72int 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}
92EXPORT_SYMBOL_NS(ssp_common_process_data, "IIO_SSP_SENSORS");
93
94MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
95MODULE_DESCRIPTION("Samsung sensorhub commons");
96MODULE_LICENSE("GPL");
97MODULE_IMPORT_NS("IIO_SSP_SENSORS");