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
ssp_gyro_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)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
ssp_gyro_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)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
ssp_process_gyro_data(struct iio_dev * indio_dev,void * buf,int64_t timestamp)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
ssp_gyro_probe(struct platform_device * pdev)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
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_gyro_data;
107 spd->type = SSP_GYROSCOPE_SENSOR;
108
109 indio_dev->name = ssp_gyro_name;
110 indio_dev->info = &ssp_gyro_iio_info;
111 indio_dev->channels = ssp_gyro_channels;
112 indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels);
113 indio_dev->available_scan_masks = ssp_gyro_scan_mask;
114
115 ret = devm_iio_kfifo_buffer_setup(&pdev->dev, indio_dev,
116 &ssp_gyro_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_GYROSCOPE_SENSOR);
128
129 return 0;
130 }
131
132 static struct platform_driver ssp_gyro_driver = {
133 .driver = {
134 .name = SSP_GYROSCOPE_NAME,
135 },
136 .probe = ssp_gyro_probe,
137 };
138
139 module_platform_driver(ssp_gyro_driver);
140
141 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
142 MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
143 MODULE_LICENSE("GPL");
144 MODULE_IMPORT_NS(IIO_SSP_SENSORS);
145