drivers/hwmon/i5500_temp.c

   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(pdev, REG_TSTHRHI, &tsthr);
  52                         pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
  53                         *val = (tsthr - tsfsc) * 500;
  54                         return 0;
  55                 case hwmon_temp_max:
  56                         pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
  57                         *val = tsthr * 500;
  58                         return 0;
  59                 case hwmon_temp_max_hyst:
  60                         pci_read_config_word(pdev, REG_TSTHRLO, &tsthr);
  61                         *val = tsthr * 500;
  62                         return 0;
  63                 case hwmon_temp_crit:
  64                         pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr);
  65                         *val = tsthr * 500;
  66                         return 0;
  67                 case hwmon_temp_max_alarm:
  68                         pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
  69                         *val = !!(ctsts & BIT(1));
  70                         return 0;
  71                 case hwmon_temp_crit_alarm:
  72                         pci_read_config_byte(pdev, REG_CTSTS, &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(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_info(&pdev->dev, "intel5500", NULL,
 134                                                          &i5500_chip_info, NULL);
 135         return PTR_ERR_OR_ZERO(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");