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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 <[email protected]>
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 <[email protected]>");
138MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
139MODULE_LICENSE("GPL");