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 "ssp_iio_sensor.h"
12 
13 /**
14  * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
15  *
16  * @indio_dev:		iio device
17  *
18  * Returns 0 or negative value in case of error
19  */
20 int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
21 {
22 	struct ssp_sensor_data *spd = iio_priv(indio_dev);
23 	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
24 
25 	/* the allocation is made in post because scan size is known in this
26 	 * moment
27 	 * */
28 	spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
29 	if (!spd->buffer)
30 		return -ENOMEM;
31 
32 	return ssp_enable_sensor(data, spd->type,
33 				 ssp_get_sensor_delay(data, spd->type));
34 }
35 EXPORT_SYMBOL(ssp_common_buffer_postenable);
36 
37 /**
38  * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
39  *
40  * @indio_dev:		iio device
41  *
42  * Returns 0 or negative value in case of error
43  */
44 int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
45 {
46 	int ret;
47 	struct ssp_sensor_data *spd = iio_priv(indio_dev);
48 	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
49 
50 	ret = ssp_disable_sensor(data, spd->type);
51 	if (ret < 0)
52 		return ret;
53 
54 	kfree(spd->buffer);
55 
56 	return ret;
57 }
58 EXPORT_SYMBOL(ssp_common_buffer_postdisable);
59 
60 /**
61  * ssp_common_process_data() - Common process data callback for ssp sensors
62  *
63  * @indio_dev:		iio device
64  * @buf:		source buffer
65  * @len:		sensor data length
66  * @timestamp:		system timestamp
67  *
68  * Returns 0 or negative value in case of error
69  */
70 int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
71 			    unsigned int len, int64_t timestamp)
72 {
73 	__le32 time;
74 	int64_t calculated_time = 0;
75 	struct ssp_sensor_data *spd = iio_priv(indio_dev);
76 
77 	if (indio_dev->scan_bytes == 0)
78 		return 0;
79 
80 	/*
81 	 * it always sends full set of samples, remember about available masks
82 	 */
83 	memcpy(spd->buffer, buf, len);
84 
85 	if (indio_dev->scan_timestamp) {
86 		memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
87 		calculated_time =
88 			timestamp + (int64_t)le32_to_cpu(time) * 1000000;
89 	}
90 
91 	return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
92 						  calculated_time);
93 }
94 EXPORT_SYMBOL(ssp_common_process_data);
95 
96 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
97 MODULE_DESCRIPTION("Samsung sensorhub commons");
98 MODULE_LICENSE("GPL");
99