tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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");