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/iio.h>
18#include <linux/iio/kfifo_buf.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/slab.h>
22#include "../common/ssp_sensors/ssp_iio_sensor.h"
23
24#define SSP_CHANNEL_COUNT 3
25
26#define SSP_GYROSCOPE_NAME "ssp-gyroscope"
27static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
28
29enum ssp_gyro_3d_channel {
30	SSP_CHANNEL_SCAN_INDEX_X,
31	SSP_CHANNEL_SCAN_INDEX_Y,
32	SSP_CHANNEL_SCAN_INDEX_Z,
33	SSP_CHANNEL_SCAN_INDEX_TIME,
34};
35
36static int ssp_gyro_read_raw(struct iio_dev *indio_dev,
37			     struct iio_chan_spec const *chan, int *val,
38			     int *val2, long mask)
39{
40	u32 t;
41	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
42
43	switch (mask) {
44	case IIO_CHAN_INFO_SAMP_FREQ:
45		t = ssp_get_sensor_delay(data, SSP_GYROSCOPE_SENSOR);
46		ssp_convert_to_freq(t, val, val2);
47		return IIO_VAL_INT_PLUS_MICRO;
48	default:
49		break;
50	}
51
52	return -EINVAL;
53}
54
55static int ssp_gyro_write_raw(struct iio_dev *indio_dev,
56			      struct iio_chan_spec const *chan, int val,
57			      int val2, long mask)
58{
59	int ret;
60	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
61
62	switch (mask) {
63	case IIO_CHAN_INFO_SAMP_FREQ:
64		ret = ssp_convert_to_time(val, val2);
65		ret = ssp_change_delay(data, SSP_GYROSCOPE_SENSOR, ret);
66		if (ret < 0)
67			dev_err(&indio_dev->dev, "gyro sensor enable fail\n");
68
69		return ret;
70	default:
71		break;
72	}
73
74	return -EINVAL;
75}
76
77static struct iio_info ssp_gyro_iio_info = {
78	.read_raw = &ssp_gyro_read_raw,
79	.write_raw = &ssp_gyro_write_raw,
80};
81
82static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, };
83
84static const struct iio_chan_spec ssp_gyro_channels[] = {
85	SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
86	SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
87	SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
88	SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
89};
90
91static int ssp_process_gyro_data(struct iio_dev *indio_dev, void *buf,
92				 int64_t timestamp)
93{
94	return ssp_common_process_data(indio_dev, buf, SSP_GYROSCOPE_SIZE,
95				       timestamp);
96}
97
98static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = {
99	.postenable = &ssp_common_buffer_postenable,
100	.postdisable = &ssp_common_buffer_postdisable,
101};
102
103static int ssp_gyro_probe(struct platform_device *pdev)
104{
105	int ret;
106	struct iio_dev *indio_dev;
107	struct ssp_sensor_data *spd;
108	struct iio_buffer *buffer;
109
110	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
111	if (!indio_dev)
112		return -ENOMEM;
113
114	spd = iio_priv(indio_dev);
115
116	spd->process_data = ssp_process_gyro_data;
117	spd->type = SSP_GYROSCOPE_SENSOR;
118
119	indio_dev->name = ssp_gyro_name;
120	indio_dev->dev.parent = &pdev->dev;
121	indio_dev->info = &ssp_gyro_iio_info;
122	indio_dev->modes = INDIO_BUFFER_SOFTWARE;
123	indio_dev->channels = ssp_gyro_channels;
124	indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels);
125	indio_dev->available_scan_masks = ssp_gyro_scan_mask;
126
127	buffer = devm_iio_kfifo_allocate(&pdev->dev);
128	if (!buffer)
129		return -ENOMEM;
130
131	iio_device_attach_buffer(indio_dev, buffer);
132
133	indio_dev->setup_ops = &ssp_gyro_buffer_ops;
134
135	platform_set_drvdata(pdev, indio_dev);
136
137	ret = iio_device_register(indio_dev);
138	if (ret < 0)
139		return ret;
140
141	/* ssp registering should be done after all iio setup */
142	ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR);
143
144	return 0;
145}
146
147static int ssp_gyro_remove(struct platform_device *pdev)
148{
149	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
150
151	iio_device_unregister(indio_dev);
152
153	return 0;
154}
155
156static struct platform_driver ssp_gyro_driver = {
157	.driver = {
158		.name = SSP_GYROSCOPE_NAME,
159	},
160	.probe = ssp_gyro_probe,
161	.remove = ssp_gyro_remove,
162};
163
164module_platform_driver(ssp_gyro_driver);
165
166MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
167MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
168MODULE_LICENSE("GPL");
169