drivers/hwmon/i5500_temp.c

   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 */
  46 static 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
  61 static 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
  75 static 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
  86 static DEVICE_ATTR_RO(temp1_input);
  87 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_thresh, NULL, 0xE2);
  88 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_thresh, NULL, 0xEC);
  89 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_thresh, NULL, 0xEE);
  90 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
  91 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
  92
  93 static 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
 103 ATTRIBUTE_GROUPS(i5500_temp);
 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 = 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
 139 static struct pci_driver i5500_temp_driver = {
 140         .name = "i5500_temp",
 141         .id_table = i5500_temp_ids,
 142         .probe = i5500_temp_probe,
 143 };
 144
 145 module_pci_driver(i5500_temp_driver);
 146
 147 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
 148 MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
 149 MODULE_LICENSE("GPL");