cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ssp_gyro_sensor.c (3736B)

      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);