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/iio.h>
8#include <linux/iio/buffer.h>
9#include <linux/iio/kfifo_buf.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include "../common/ssp_sensors/ssp_iio_sensor.h"
14
15#define SSP_CHANNEL_COUNT 3
16
17#define SSP_ACCEL_NAME "ssp-accelerometer"
18static const char ssp_accel_device_name[] = SSP_ACCEL_NAME;
19
20enum ssp_accel_3d_channel {
21	SSP_CHANNEL_SCAN_INDEX_X,
22	SSP_CHANNEL_SCAN_INDEX_Y,
23	SSP_CHANNEL_SCAN_INDEX_Z,
24	SSP_CHANNEL_SCAN_INDEX_TIME,
25};
26
27static int ssp_accel_read_raw(struct iio_dev *indio_dev,
28			      struct iio_chan_spec const *chan,  int *val,
29			      int *val2, long mask)
30{
31	u32 t;
32	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
33
34	switch (mask) {
35	case IIO_CHAN_INFO_SAMP_FREQ:
36		t = ssp_get_sensor_delay(data, SSP_ACCELEROMETER_SENSOR);
37		ssp_convert_to_freq(t, val, val2);
38		return IIO_VAL_INT_PLUS_MICRO;
39	default:
40		break;
41	}
42
43	return -EINVAL;
44}
45
46static int ssp_accel_write_raw(struct iio_dev *indio_dev,
47			       struct iio_chan_spec const *chan, int val,
48			       int val2, long mask)
49{
50	int ret;
51	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
52
53	switch (mask) {
54	case IIO_CHAN_INFO_SAMP_FREQ:
55		ret = ssp_convert_to_time(val, val2);
56		ret = ssp_change_delay(data, SSP_ACCELEROMETER_SENSOR, ret);
57		if (ret < 0)
58			dev_err(&indio_dev->dev, "accel sensor enable fail\n");
59
60		return ret;
61	default:
62		break;
63	}
64
65	return -EINVAL;
66}
67
68static const struct iio_info ssp_accel_iio_info = {
69	.read_raw = &ssp_accel_read_raw,
70	.write_raw = &ssp_accel_write_raw,
71};
72
73static const unsigned long ssp_accel_scan_mask[] = { 0x7, 0, };
74
75static const struct iio_chan_spec ssp_acc_channels[] = {
76	SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
77	SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
78	SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
79	SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
80};
81
82static int ssp_process_accel_data(struct iio_dev *indio_dev, void *buf,
83				  int64_t timestamp)
84{
85	return ssp_common_process_data(indio_dev, buf, SSP_ACCELEROMETER_SIZE,
86				       timestamp);
87}
88
89static const struct iio_buffer_setup_ops ssp_accel_buffer_ops = {
90	.postenable = &ssp_common_buffer_postenable,
91	.postdisable = &ssp_common_buffer_postdisable,
92};
93
94static int ssp_accel_probe(struct platform_device *pdev)
95{
96	int ret;
97	struct iio_dev *indio_dev;
98	struct ssp_sensor_data *spd;
99
100	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
101	if (!indio_dev)
102		return -ENOMEM;
103
104	spd = iio_priv(indio_dev);
105
106	spd->process_data = ssp_process_accel_data;
107	spd->type = SSP_ACCELEROMETER_SENSOR;
108
109	indio_dev->name = ssp_accel_device_name;
110	indio_dev->info = &ssp_accel_iio_info;
111	indio_dev->channels = ssp_acc_channels;
112	indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels);
113	indio_dev->available_scan_masks = ssp_accel_scan_mask;
114
115	ret = devm_iio_kfifo_buffer_setup(&pdev->dev, indio_dev,
116					  &ssp_accel_buffer_ops);
117	if (ret)
118		return ret;
119
120	platform_set_drvdata(pdev, indio_dev);
121
122	ret = devm_iio_device_register(&pdev->dev, indio_dev);
123	if (ret < 0)
124		return ret;
125
126	/* ssp registering should be done after all iio setup */
127	ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR);
128
129	return 0;
130}
131
132static struct platform_driver ssp_accel_driver = {
133	.driver = {
134		.name = SSP_ACCEL_NAME,
135	},
136	.probe = ssp_accel_probe,
137};
138
139module_platform_driver(ssp_accel_driver);
140
141MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
142MODULE_DESCRIPTION("Samsung sensorhub accelerometers driver");
143MODULE_LICENSE("GPL");
144MODULE_IMPORT_NS(IIO_SSP_SENSORS);
145