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 int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
 33		      long *val)
 34{
 35	struct pci_dev *pdev = to_pci_dev(dev->parent);
 36	u16 tsthr;
 37	s8 tsfsc;
 38	u8 ctsts;
 39
 40	switch (type) {
 41	case hwmon_temp:
 42		switch (attr) {
 43		/* Sensor resolution : 0.5 degree C */
 44		case hwmon_temp_input:
 45			pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
 46			pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
 47			*val = (tsthr - tsfsc) * 500;
 48			return 0;
 49		case hwmon_temp_max:
 50			pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
 51			*val = tsthr * 500;
 52			return 0;
 53		case hwmon_temp_max_hyst:
 54			pci_read_config_word(pdev, REG_TSTHRLO, &tsthr);
 55			*val = tsthr * 500;
 56			return 0;
 57		case hwmon_temp_crit:
 58			pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr);
 59			*val = tsthr * 500;
 60			return 0;
 61		case hwmon_temp_max_alarm:
 62			pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
 63			*val = !!(ctsts & BIT(1));
 64			return 0;
 65		case hwmon_temp_crit_alarm:
 66			pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
 67			*val = !!(ctsts & BIT(0));
 68			return 0;
 69		default:
 70			break;
 71		}
 72		break;
 73	default:
 74		break;
 75	}
 76
 77	return -EOPNOTSUPP;
 78}
 79
 80static const struct hwmon_ops i5500_ops = {
 81	.visible = 0444,
 82	.read = i5500_read,
 83};
 84
 85static const struct hwmon_channel_info * const i5500_info[] = {
 86	HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
 87	HWMON_CHANNEL_INFO(temp,
 88			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
 89			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM
 90			   ),
 91	NULL
 92};
 93
 94static const struct hwmon_chip_info i5500_chip_info = {
 95	.ops = &i5500_ops,
 96	.info = i5500_info,
 97};
 98
 99static const struct pci_device_id i5500_temp_ids[] = {
100	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) },
101	{ 0 },
102};
103
104MODULE_DEVICE_TABLE(pci, i5500_temp_ids);
105
106static int i5500_temp_probe(struct pci_dev *pdev,
107			    const struct pci_device_id *id)
108{
109	int err;
110	struct device *hwmon_dev;
111	u32 tstimer;
112	s8 tsfsc;
113
114	err = pcim_enable_device(pdev);
115	if (err) {
116		dev_err(&pdev->dev, "Failed to enable device\n");
117		return err;
118	}
119
120	pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
121	pci_read_config_dword(pdev, REG_TSTIMER, &tstimer);
122	if (tsfsc == 0x7F && tstimer == 0x07D30D40) {
123		dev_notice(&pdev->dev, "Sensor seems to be disabled\n");
124		return -ENODEV;
125	}
126
127	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "intel5500", NULL,
128							 &i5500_chip_info, NULL);
129	return PTR_ERR_OR_ZERO(hwmon_dev);
130}
131
132static struct pci_driver i5500_temp_driver = {
133	.name = "i5500_temp",
134	.id_table = i5500_temp_ids,
135	.probe = i5500_temp_probe,
136};
137
138module_pci_driver(i5500_temp_driver);
139
140MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
141MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
142MODULE_LICENSE("GPL");