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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i5500_temp.c (3606B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * i5500_temp - Driver for Intel 5500/5520/X58 chipset thermal sensor
      4 *
      5 * Copyright (C) 2012, 2014 Jean Delvare <jdelvare@suse.de>
      6 */
      7
      8#include <linux/bitops.h>
      9#include <linux/module.h>
     10#include <linux/init.h>
     11#include <linux/slab.h>
     12#include <linux/jiffies.h>
     13#include <linux/device.h>
     14#include <linux/pci.h>
     15#include <linux/hwmon.h>
     16#include <linux/err.h>
     17#include <linux/mutex.h>
     18
     19/* Register definitions from datasheet */
     20#define REG_TSTHRCATA	0xE2
     21#define REG_TSCTRL	0xE8
     22#define REG_TSTHRRPEX	0xEB
     23#define REG_TSTHRLO	0xEC
     24#define REG_TSTHRHI	0xEE
     25#define REG_CTHINT	0xF0
     26#define REG_TSFSC	0xF3
     27#define REG_CTSTS	0xF4
     28#define REG_TSTHRRQPI	0xF5
     29#define REG_CTCTRL	0xF7
     30#define REG_TSTIMER	0xF8
     31
     32static umode_t i5500_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
     33				int channel)
     34{
     35	return 0444;
     36}
     37
     38static int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
     39		      long *val)
     40{
     41	struct pci_dev *pdev = to_pci_dev(dev->parent);
     42	u16 tsthr;
     43	s8 tsfsc;
     44	u8 ctsts;
     45
     46	switch (type) {
     47	case hwmon_temp:
     48		switch (attr) {
     49		/* Sensor resolution : 0.5 degree C */
     50		case hwmon_temp_input:
     51			pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
     52			pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
     53			*val = (tsthr - tsfsc) * 500;
     54			return 0;
     55		case hwmon_temp_max:
     56			pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
     57			*val = tsthr * 500;
     58			return 0;
     59		case hwmon_temp_max_hyst:
     60			pci_read_config_word(pdev, REG_TSTHRLO, &tsthr);
     61			*val = tsthr * 500;
     62			return 0;
     63		case hwmon_temp_crit:
     64			pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr);
     65			*val = tsthr * 500;
     66			return 0;
     67		case hwmon_temp_max_alarm:
     68			pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
     69			*val = !!(ctsts & BIT(1));
     70			return 0;
     71		case hwmon_temp_crit_alarm:
     72			pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
     73			*val = !!(ctsts & BIT(0));
     74			return 0;
     75		default:
     76			break;
     77		}
     78		break;
     79	default:
     80		break;
     81	}
     82
     83	return -EOPNOTSUPP;
     84}
     85
     86static const struct hwmon_ops i5500_ops = {
     87	.is_visible = i5500_is_visible,
     88	.read = i5500_read,
     89};
     90
     91static const struct hwmon_channel_info *i5500_info[] = {
     92	HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
     93	HWMON_CHANNEL_INFO(temp,
     94			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
     95			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM
     96			   ),
     97	NULL
     98};
     99
    100static const struct hwmon_chip_info i5500_chip_info = {
    101	.ops = &i5500_ops,
    102	.info = i5500_info,
    103};
    104
    105static const struct pci_device_id i5500_temp_ids[] = {
    106	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) },
    107	{ 0 },
    108};
    109
    110MODULE_DEVICE_TABLE(pci, i5500_temp_ids);
    111
    112static int i5500_temp_probe(struct pci_dev *pdev,
    113			    const struct pci_device_id *id)
    114{
    115	int err;
    116	struct device *hwmon_dev;
    117	u32 tstimer;
    118	s8 tsfsc;
    119
    120	err = pci_enable_device(pdev);
    121	if (err) {
    122		dev_err(&pdev->dev, "Failed to enable device\n");
    123		return err;
    124	}
    125
    126	pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
    127	pci_read_config_dword(pdev, REG_TSTIMER, &tstimer);
    128	if (tsfsc == 0x7F && tstimer == 0x07D30D40) {
    129		dev_notice(&pdev->dev, "Sensor seems to be disabled\n");
    130		return -ENODEV;
    131	}
    132
    133	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "intel5500", NULL,
    134							 &i5500_chip_info, NULL);
    135	return PTR_ERR_OR_ZERO(hwmon_dev);
    136}
    137
    138static struct pci_driver i5500_temp_driver = {
    139	.name = "i5500_temp",
    140	.id_table = i5500_temp_ids,
    141	.probe = i5500_temp_probe,
    142};
    143
    144module_pci_driver(i5500_temp_driver);
    145
    146MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
    147MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
    148MODULE_LICENSE("GPL");