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 | |
32 | static umode_t i5500_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, |
33 | int channel) |
34 | { |
35 | return 0444; |
36 | } |
37 | |
38 | static 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(dev: pdev, REG_TSTHRHI, val: &tsthr); |
52 | pci_read_config_byte(dev: pdev, REG_TSFSC, val: &tsfsc); |
53 | *val = (tsthr - tsfsc) * 500; |
54 | return 0; |
55 | case hwmon_temp_max: |
56 | pci_read_config_word(dev: pdev, REG_TSTHRHI, val: &tsthr); |
57 | *val = tsthr * 500; |
58 | return 0; |
59 | case hwmon_temp_max_hyst: |
60 | pci_read_config_word(dev: pdev, REG_TSTHRLO, val: &tsthr); |
61 | *val = tsthr * 500; |
62 | return 0; |
63 | case hwmon_temp_crit: |
64 | pci_read_config_word(dev: pdev, REG_TSTHRCATA, val: &tsthr); |
65 | *val = tsthr * 500; |
66 | return 0; |
67 | case hwmon_temp_max_alarm: |
68 | pci_read_config_byte(dev: pdev, REG_CTSTS, val: &ctsts); |
69 | *val = !!(ctsts & BIT(1)); |
70 | return 0; |
71 | case hwmon_temp_crit_alarm: |
72 | pci_read_config_byte(dev: pdev, REG_CTSTS, val: &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 | |
86 | static const struct hwmon_ops i5500_ops = { |
87 | .is_visible = i5500_is_visible, |
88 | .read = i5500_read, |
89 | }; |
90 | |
91 | static 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 | |
100 | static const struct hwmon_chip_info i5500_chip_info = { |
101 | .ops = &i5500_ops, |
102 | .info = i5500_info, |
103 | }; |
104 | |
105 | static const struct pci_device_id i5500_temp_ids[] = { |
106 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) }, |
107 | { 0 }, |
108 | }; |
109 | |
110 | MODULE_DEVICE_TABLE(pci, i5500_temp_ids); |
111 | |
112 | static 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(dev: pdev, REG_TSFSC, val: &tsfsc); |
127 | pci_read_config_dword(dev: pdev, REG_TSTIMER, val: &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(dev: &pdev->dev, name: "intel5500" , NULL, |
134 | info: &i5500_chip_info, NULL); |
135 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
136 | } |
137 | |
138 | static struct pci_driver i5500_temp_driver = { |
139 | .name = "i5500_temp" , |
140 | .id_table = i5500_temp_ids, |
141 | .probe = i5500_temp_probe, |
142 | }; |
143 | |
144 | module_pci_driver(i5500_temp_driver); |
145 | |
146 | MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>" ); |
147 | MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver" ); |
148 | MODULE_LICENSE("GPL" ); |
149 | |