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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viperboard_adc.c (3502B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Nano River Technologies viperboard IIO ADC driver
      4 *
      5 *  (C) 2012 by Lemonage GmbH
      6 *  Author: Lars Poeschel <poeschel@lemonage.de>
      7 *  All rights reserved.
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/errno.h>
     12#include <linux/module.h>
     13#include <linux/slab.h>
     14#include <linux/types.h>
     15#include <linux/mutex.h>
     16#include <linux/platform_device.h>
     17
     18#include <linux/usb.h>
     19#include <linux/iio/iio.h>
     20
     21#include <linux/mfd/viperboard.h>
     22
     23#define VPRBRD_ADC_CMD_GET		0x00
     24
     25struct vprbrd_adc_msg {
     26	u8 cmd;
     27	u8 chan;
     28	u8 val;
     29} __packed;
     30
     31struct vprbrd_adc {
     32	struct vprbrd *vb;
     33};
     34
     35#define VPRBRD_ADC_CHANNEL(_index) {			\
     36	.type = IIO_VOLTAGE,				\
     37	.indexed = 1,					\
     38	.channel = _index,				\
     39	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
     40}
     41
     42static struct iio_chan_spec const vprbrd_adc_iio_channels[] = {
     43	VPRBRD_ADC_CHANNEL(0),
     44	VPRBRD_ADC_CHANNEL(1),
     45	VPRBRD_ADC_CHANNEL(2),
     46	VPRBRD_ADC_CHANNEL(3),
     47};
     48
     49static int vprbrd_iio_read_raw(struct iio_dev *iio_dev,
     50				struct iio_chan_spec const *chan,
     51				int *val,
     52				int *val2,
     53				long info)
     54{
     55	int ret, error = 0;
     56	struct vprbrd_adc *adc = iio_priv(iio_dev);
     57	struct vprbrd *vb = adc->vb;
     58	struct vprbrd_adc_msg *admsg = (struct vprbrd_adc_msg *)vb->buf;
     59
     60	switch (info) {
     61	case IIO_CHAN_INFO_RAW:
     62		mutex_lock(&vb->lock);
     63
     64		admsg->cmd = VPRBRD_ADC_CMD_GET;
     65		admsg->chan = chan->channel;
     66		admsg->val = 0x00;
     67
     68		ret = usb_control_msg(vb->usb_dev,
     69			usb_sndctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
     70			VPRBRD_USB_TYPE_OUT, 0x0000, 0x0000, admsg,
     71			sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);
     72		if (ret != sizeof(struct vprbrd_adc_msg)) {
     73			dev_err(&iio_dev->dev, "usb send error on adc read\n");
     74			error = -EREMOTEIO;
     75		}
     76
     77		ret = usb_control_msg(vb->usb_dev,
     78			usb_rcvctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
     79			VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, admsg,
     80			sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);
     81
     82		*val = admsg->val;
     83
     84		mutex_unlock(&vb->lock);
     85
     86		if (ret != sizeof(struct vprbrd_adc_msg)) {
     87			dev_err(&iio_dev->dev, "usb recv error on adc read\n");
     88			error = -EREMOTEIO;
     89		}
     90
     91		if (error)
     92			goto error;
     93
     94		return IIO_VAL_INT;
     95	default:
     96		error = -EINVAL;
     97		break;
     98	}
     99error:
    100	return error;
    101}
    102
    103static const struct iio_info vprbrd_adc_iio_info = {
    104	.read_raw = &vprbrd_iio_read_raw,
    105};
    106
    107static int vprbrd_adc_probe(struct platform_device *pdev)
    108{
    109	struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent);
    110	struct vprbrd_adc *adc;
    111	struct iio_dev *indio_dev;
    112	int ret;
    113
    114	/* registering iio */
    115	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
    116	if (!indio_dev) {
    117		dev_err(&pdev->dev, "failed allocating iio device\n");
    118		return -ENOMEM;
    119	}
    120
    121	adc = iio_priv(indio_dev);
    122	adc->vb = vb;
    123	indio_dev->name = "viperboard adc";
    124	indio_dev->info = &vprbrd_adc_iio_info;
    125	indio_dev->modes = INDIO_DIRECT_MODE;
    126	indio_dev->channels = vprbrd_adc_iio_channels;
    127	indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels);
    128
    129	ret = devm_iio_device_register(&pdev->dev, indio_dev);
    130	if (ret) {
    131		dev_err(&pdev->dev, "could not register iio (adc)");
    132		return ret;
    133	}
    134
    135	return 0;
    136}
    137
    138static struct platform_driver vprbrd_adc_driver = {
    139	.driver = {
    140		.name	= "viperboard-adc",
    141	},
    142	.probe		= vprbrd_adc_probe,
    143};
    144
    145module_platform_driver(vprbrd_adc_driver);
    146
    147MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
    148MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard");
    149MODULE_LICENSE("GPL");
    150MODULE_ALIAS("platform:viperboard-adc");