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 */
29int 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}
44EXPORT_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 */
53int 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}
67EXPORT_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 */
79int 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}
103EXPORT_SYMBOL(ssp_common_process_data);
104
105MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
106MODULE_DESCRIPTION("Samsung sensorhub commons");
107MODULE_LICENSE("GPL");
108