LXR linux/drivers/hwmon/i5500

   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