i5500_temp.c

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