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"
 18static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
 19
 20enum 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
 27static 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
 46static 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
 68static const struct iio_info ssp_gyro_iio_info = {
 69	.read_raw = &ssp_gyro_read_raw,
 70	.write_raw = &ssp_gyro_write_raw,
 71};
 72
 73static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, };
 74
 75static 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
 82static 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
 89static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = {
 90	.postenable = &ssp_common_buffer_postenable,
 91	.postdisable = &ssp_common_buffer_postdisable,
 92};
 93
 94static 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
132static struct platform_driver ssp_gyro_driver = {
133	.driver = {
134		.name = SSP_GYROSCOPE_NAME,
135	},
136	.probe = ssp_gyro_probe,
137};
138
139module_platform_driver(ssp_gyro_driver);
140
141MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
142MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
143MODULE_LICENSE("GPL");
144MODULE_IMPORT_NS("IIO_SSP_SENSORS");