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 <[email protected]>
   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 int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
  33                       long *val)
  34 {
  35         struct pci_dev *pdev = to_pci_dev(dev->parent);
  36         u16 tsthr;
  37         s8 tsfsc;
  38         u8 ctsts;
  39
  40         switch (type) {
  41         case hwmon_temp:
  42                 switch (attr) {
  43                 /* Sensor resolution : 0.5 degree C */
  44                 case hwmon_temp_input:
  45                         pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
  46                         pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
  47                         *val = (tsthr - tsfsc) * 500;
  48                         return 0;
  49                 case hwmon_temp_max:
  50                         pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
  51                         *val = tsthr * 500;
  52                         return 0;
  53                 case hwmon_temp_max_hyst:
  54                         pci_read_config_word(pdev, REG_TSTHRLO, &tsthr);
  55                         *val = tsthr * 500;
  56                         return 0;
  57                 case hwmon_temp_crit:
  58                         pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr);
  59                         *val = tsthr * 500;
  60                         return 0;
  61                 case hwmon_temp_max_alarm:
  62                         pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
  63                         *val = !!(ctsts & BIT(1));
  64                         return 0;
  65                 case hwmon_temp_crit_alarm:
  66                         pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
  67                         *val = !!(ctsts & BIT(0));
  68                         return 0;
  69                 default:
  70                         break;
  71                 }
  72                 break;
  73         default:
  74                 break;
  75         }
  76
  77         return -EOPNOTSUPP;
  78 }
  79
  80 static const struct hwmon_ops i5500_ops = {
  81         .visible = 0444,
  82         .read = i5500_read,
  83 };
  84
  85 static const struct hwmon_channel_info * const i5500_info[] = {
  86         HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
  87         HWMON_CHANNEL_INFO(temp,
  88                            HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
  89                            HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM
  90                            ),
  91         NULL
  92 };
  93
  94 static const struct hwmon_chip_info i5500_chip_info = {
  95         .ops = &i5500_ops,
  96         .info = i5500_info,
  97 };
  98
  99 static const struct pci_device_id i5500_temp_ids[] = {
 100         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) },
 101         { 0 },
 102 };
 103
 104 MODULE_DEVICE_TABLE(pci, i5500_temp_ids);
 105
 106 static int i5500_temp_probe(struct pci_dev *pdev,
 107                             const struct pci_device_id *id)
 108 {
 109         int err;
 110         struct device *hwmon_dev;
 111         u32 tstimer;
 112         s8 tsfsc;
 113
 114         err = pcim_enable_device(pdev);
 115         if (err) {
 116                 dev_err(&pdev->dev, "Failed to enable device\n");
 117                 return err;
 118         }
 119
 120         pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
 121         pci_read_config_dword(pdev, REG_TSTIMER, &tstimer);
 122         if (tsfsc == 0x7F && tstimer == 0x07D30D40) {
 123                 dev_notice(&pdev->dev, "Sensor seems to be disabled\n");
 124                 return -ENODEV;
 125         }
 126
 127         hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "intel5500", NULL,
 128                                                          &i5500_chip_info, NULL);
 129         return PTR_ERR_OR_ZERO(hwmon_dev);
 130 }
 131
 132 static struct pci_driver i5500_temp_driver = {
 133         .name = "i5500_temp",
 134         .id_table = i5500_temp_ids,
 135         .probe = i5500_temp_probe,
 136 };
 137
 138 module_pci_driver(i5500_temp_driver);
 139
 140 MODULE_AUTHOR("Jean Delvare <[email protected]>");
 141 MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
 142 MODULE_LICENSE("GPL");