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 temp1_input_show(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_RO(temp1_input);
 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");