cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

adis16130.c (4548B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ADIS16130 Digital Output, High Precision Angular Rate Sensor driver
      4 *
      5 * Copyright 2010 Analog Devices Inc.
      6 */
      7
      8#include <linux/mutex.h>
      9#include <linux/kernel.h>
     10#include <linux/spi/spi.h>
     11#include <linux/module.h>
     12
     13#include <linux/iio/iio.h>
     14
     15#include <asm/unaligned.h>
     16
     17#define ADIS16130_CON         0x0
     18#define ADIS16130_CON_RD      (1 << 6)
     19#define ADIS16130_IOP         0x1
     20
     21/* 1 = data-ready signal low when unread data on all channels; */
     22#define ADIS16130_IOP_ALL_RDY (1 << 3)
     23#define ADIS16130_IOP_SYNC    (1 << 0) /* 1 = synchronization enabled */
     24#define ADIS16130_RATEDATA    0x8 /* Gyroscope output, rate of rotation */
     25#define ADIS16130_TEMPDATA    0xA /* Temperature output */
     26#define ADIS16130_RATECS      0x28 /* Gyroscope channel setup */
     27#define ADIS16130_RATECS_EN   (1 << 3) /* 1 = channel enable; */
     28#define ADIS16130_TEMPCS      0x2A /* Temperature channel setup */
     29#define ADIS16130_TEMPCS_EN   (1 << 3)
     30#define ADIS16130_RATECONV    0x30
     31#define ADIS16130_TEMPCONV    0x32
     32#define ADIS16130_MODE        0x38
     33#define ADIS16130_MODE_24BIT  (1 << 1) /* 1 = 24-bit resolution; */
     34
     35/**
     36 * struct adis16130_state - device instance specific data
     37 * @us:			actual spi_device to write data
     38 * @buf_lock:		mutex to protect tx and rx
     39 * @buf:		unified tx/rx buffer
     40 **/
     41struct adis16130_state {
     42	struct spi_device		*us;
     43	struct mutex			buf_lock;
     44	u8				buf[4] ____cacheline_aligned;
     45};
     46
     47static int adis16130_spi_read(struct iio_dev *indio_dev, u8 reg_addr, u32 *val)
     48{
     49	int ret;
     50	struct adis16130_state *st = iio_priv(indio_dev);
     51	struct spi_transfer xfer = {
     52		.tx_buf = st->buf,
     53		.rx_buf = st->buf,
     54		.len = 4,
     55	};
     56
     57	mutex_lock(&st->buf_lock);
     58
     59	st->buf[0] = ADIS16130_CON_RD | reg_addr;
     60	st->buf[1] = st->buf[2] = st->buf[3] = 0;
     61
     62	ret = spi_sync_transfer(st->us, &xfer, 1);
     63	if (ret == 0)
     64		*val = get_unaligned_be24(&st->buf[1]);
     65	mutex_unlock(&st->buf_lock);
     66
     67	return ret;
     68}
     69
     70static int adis16130_read_raw(struct iio_dev *indio_dev,
     71			      struct iio_chan_spec const *chan,
     72			      int *val, int *val2,
     73			      long mask)
     74{
     75	int ret;
     76	u32 temp;
     77
     78	switch (mask) {
     79	case IIO_CHAN_INFO_RAW:
     80		/* Take the iio_dev status lock */
     81		ret = adis16130_spi_read(indio_dev, chan->address, &temp);
     82		if (ret)
     83			return ret;
     84		*val = temp;
     85		return IIO_VAL_INT;
     86	case IIO_CHAN_INFO_SCALE:
     87		switch (chan->type) {
     88		case IIO_ANGL_VEL:
     89			/* 0 degree = 838860, 250 degree = 14260608 */
     90			*val = 250;
     91			*val2 = 336440817; /* RAD_TO_DEGREE(14260608 - 8388608) */
     92			return IIO_VAL_FRACTIONAL;
     93		case IIO_TEMP:
     94			/* 0C = 8036283, 105C = 9516048 */
     95			*val = 105000;
     96			*val2 = 9516048 - 8036283;
     97			return IIO_VAL_FRACTIONAL;
     98		default:
     99			return -EINVAL;
    100		}
    101	case IIO_CHAN_INFO_OFFSET:
    102		switch (chan->type) {
    103		case IIO_ANGL_VEL:
    104			*val = -8388608;
    105			return IIO_VAL_INT;
    106		case IIO_TEMP:
    107			*val = -8036283;
    108			return IIO_VAL_INT;
    109		default:
    110			return -EINVAL;
    111		}
    112	}
    113
    114	return -EINVAL;
    115}
    116
    117static const struct iio_chan_spec adis16130_channels[] = {
    118	{
    119		.type = IIO_ANGL_VEL,
    120		.modified = 1,
    121		.channel2 = IIO_MOD_Z,
    122		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
    123			BIT(IIO_CHAN_INFO_SCALE) |
    124			BIT(IIO_CHAN_INFO_OFFSET),
    125		.address = ADIS16130_RATEDATA,
    126	}, {
    127		.type = IIO_TEMP,
    128		.indexed = 1,
    129		.channel = 0,
    130		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
    131			BIT(IIO_CHAN_INFO_SCALE) |
    132			BIT(IIO_CHAN_INFO_OFFSET),
    133		.address = ADIS16130_TEMPDATA,
    134	}
    135};
    136
    137static const struct iio_info adis16130_info = {
    138	.read_raw = &adis16130_read_raw,
    139};
    140
    141static int adis16130_probe(struct spi_device *spi)
    142{
    143	struct adis16130_state *st;
    144	struct iio_dev *indio_dev;
    145
    146	/* setup the industrialio driver allocated elements */
    147	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
    148	if (!indio_dev)
    149		return -ENOMEM;
    150	st = iio_priv(indio_dev);
    151	/* this is only used for removal purposes */
    152	spi_set_drvdata(spi, indio_dev);
    153	st->us = spi;
    154	mutex_init(&st->buf_lock);
    155	indio_dev->name = spi->dev.driver->name;
    156	indio_dev->channels = adis16130_channels;
    157	indio_dev->num_channels = ARRAY_SIZE(adis16130_channels);
    158	indio_dev->info = &adis16130_info;
    159	indio_dev->modes = INDIO_DIRECT_MODE;
    160
    161	return devm_iio_device_register(&spi->dev, indio_dev);
    162}
    163
    164static struct spi_driver adis16130_driver = {
    165	.driver = {
    166		.name = "adis16130",
    167	},
    168	.probe = adis16130_probe,
    169};
    170module_spi_driver(adis16130_driver);
    171
    172MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
    173MODULE_DESCRIPTION("Analog Devices ADIS16130 High Precision Angular Rate");
    174MODULE_LICENSE("GPL v2");
    175MODULE_ALIAS("spi:adis16130");