1/*
2 * i5500_temp - Driver for Intel 5500/5520/X58 chipset thermal sensor
3 *
4 * Copyright (C) 2012, 2014 Jean Delvare <jdelvare@suse.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/jiffies.h>
21#include <linux/device.h>
22#include <linux/pci.h>
23#include <linux/hwmon.h>
24#include <linux/hwmon-sysfs.h>
25#include <linux/err.h>
26#include <linux/mutex.h>
27
28/* Register definitions from datasheet */
29#define REG_TSTHRCATA	0xE2
30#define REG_TSCTRL	0xE8
31#define REG_TSTHRRPEX	0xEB
32#define REG_TSTHRLO	0xEC
33#define REG_TSTHRHI	0xEE
34#define REG_CTHINT	0xF0
35#define REG_TSFSC	0xF3
36#define REG_CTSTS	0xF4
37#define REG_TSTHRRQPI	0xF5
38#define REG_CTCTRL	0xF7
39#define REG_TSTIMER	0xF8
40
41/*
42 * Sysfs stuff
43 */
44
45/* Sensor resolution : 0.5 degree C */
46static ssize_t show_temp(struct device *dev,
47			 struct device_attribute *devattr, char *buf)
48{
49	struct pci_dev *pdev = to_pci_dev(dev->parent);
50	long temp;
51	u16 tsthrhi;
52	s8 tsfsc;
53
54	pci_read_config_word(pdev, REG_TSTHRHI, &tsthrhi);
55	pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
56	temp = ((long)tsthrhi - tsfsc) * 500;
57
58	return sprintf(buf, "%ld\n", temp);
59}
60
61static ssize_t show_thresh(struct device *dev,
62			   struct device_attribute *devattr, char *buf)
63{
64	struct pci_dev *pdev = to_pci_dev(dev->parent);
65	int reg = to_sensor_dev_attr(devattr)->index;
66	long temp;
67	u16 tsthr;
68
69	pci_read_config_word(pdev, reg, &tsthr);
70	temp = tsthr * 500;
71
72	return sprintf(buf, "%ld\n", temp);
73}
74
75static ssize_t show_alarm(struct device *dev,
76			  struct device_attribute *devattr, char *buf)
77{
78	struct pci_dev *pdev = to_pci_dev(dev->parent);
79	int nr = to_sensor_dev_attr(devattr)->index;
80	u8 ctsts;
81
82	pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
83	return sprintf(buf, "%u\n", (unsigned int)ctsts & (1 << nr));
84}
85
86static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
87static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_thresh, NULL, 0xE2);
88static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_thresh, NULL, 0xEC);
89static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_thresh, NULL, 0xEE);
90static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
91static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
92
93static struct attribute *i5500_temp_attrs[] = {
94	&dev_attr_temp1_input.attr,
95	&sensor_dev_attr_temp1_crit.dev_attr.attr,
96	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
97	&sensor_dev_attr_temp1_max.dev_attr.attr,
98	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
99	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
100	NULL
101};
102
103ATTRIBUTE_GROUPS(i5500_temp);
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 = pci_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_groups(&pdev->dev,
134							   "intel5500", NULL,
135							   i5500_temp_groups);
136	return PTR_ERR_OR_ZERO(hwmon_dev);
137}
138
139static struct pci_driver i5500_temp_driver = {
140	.name = "i5500_temp",
141	.id_table = i5500_temp_ids,
142	.probe = i5500_temp_probe,
143};
144
145module_pci_driver(i5500_temp_driver);
146
147MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
148MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
149MODULE_LICENSE("GPL");
150