treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / iio / gyro / ssp_gyro_sensor.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/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_GYROSCOPE_NAME "ssp-gyroscope"
18 static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
19
20 enum ssp_gyro_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
27 static int ssp_gyro_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_GYROSCOPE_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
46 static int ssp_gyro_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_GYROSCOPE_SENSOR, ret);
57                 if (ret < 0)
58                         dev_err(&indio_dev->dev, "gyro sensor enable fail\n");
59
60                 return ret;
61         default:
62                 break;
63         }
64
65         return -EINVAL;
66 }
67
68 static const struct iio_info ssp_gyro_iio_info = {
69         .read_raw = &ssp_gyro_read_raw,
70         .write_raw = &ssp_gyro_write_raw,
71 };
72
73 static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, };
74
75 static const struct iio_chan_spec ssp_gyro_channels[] = {
76         SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
77         SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
78         SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
79         SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
80 };
81
82 static int ssp_process_gyro_data(struct iio_dev *indio_dev, void *buf,
83                                  int64_t timestamp)
84 {
85         return ssp_common_process_data(indio_dev, buf, SSP_GYROSCOPE_SIZE,
86                                        timestamp);
87 }
88
89 static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = {
90         .postenable = &ssp_common_buffer_postenable,
91         .postdisable = &ssp_common_buffer_postdisable,
92 };
93
94 static int ssp_gyro_probe(struct platform_device *pdev)
95 {
96         int ret;
97         struct iio_dev *indio_dev;
98         struct ssp_sensor_data *spd;
99         struct iio_buffer *buffer;
100
101         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
102         if (!indio_dev)
103                 return -ENOMEM;
104
105         spd = iio_priv(indio_dev);
106
107         spd->process_data = ssp_process_gyro_data;
108         spd->type = SSP_GYROSCOPE_SENSOR;
109
110         indio_dev->name = ssp_gyro_name;
111         indio_dev->dev.parent = &pdev->dev;
112         indio_dev->info = &ssp_gyro_iio_info;
113         indio_dev->modes = INDIO_BUFFER_SOFTWARE;
114         indio_dev->channels = ssp_gyro_channels;
115         indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels);
116         indio_dev->available_scan_masks = ssp_gyro_scan_mask;
117
118         buffer = devm_iio_kfifo_allocate(&pdev->dev);
119         if (!buffer)
120                 return -ENOMEM;
121
122         iio_device_attach_buffer(indio_dev, buffer);
123
124         indio_dev->setup_ops = &ssp_gyro_buffer_ops;
125
126         platform_set_drvdata(pdev, indio_dev);
127
128         ret = devm_iio_device_register(&pdev->dev, indio_dev);
129         if (ret < 0)
130                 return ret;
131
132         /* ssp registering should be done after all iio setup */
133         ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR);
134
135         return 0;
136 }
137
138 static struct platform_driver ssp_gyro_driver = {
139         .driver = {
140                 .name = SSP_GYROSCOPE_NAME,
141         },
142         .probe = ssp_gyro_probe,
143 };
144
145 module_platform_driver(ssp_gyro_driver);
146
147 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
148 MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
149 MODULE_LICENSE("GPL");