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 * const 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 = pcim_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");