root/drivers/hwmon/i5500_temp.c

DEFINITIONS

1. temp1_input_show
2. thresh_show
3. alarm_show
4. i5500_temp_probe

   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/module.h>
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/jiffies.h>
  12 #include <linux/device.h>
  13 #include <linux/pci.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/hwmon-sysfs.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 /*
  33  * Sysfs stuff
  34  */
  35 
  36 /* Sensor resolution : 0.5 degree C */
  37 static ssize_t temp1_input_show(struct device *dev,
  38                                 struct device_attribute *devattr, char *buf)
  39 {
  40         struct pci_dev *pdev = to_pci_dev(dev->parent);
  41         long temp;
  42         u16 tsthrhi;
  43         s8 tsfsc;
  44 
  45         pci_read_config_word(pdev, REG_TSTHRHI, &tsthrhi);
  46         pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
  47         temp = ((long)tsthrhi - tsfsc) * 500;
  48 
  49         return sprintf(buf, "%ld\n", temp);
  50 }
  51 
  52 static ssize_t thresh_show(struct device *dev,
  53                            struct device_attribute *devattr, char *buf)
  54 {
  55         struct pci_dev *pdev = to_pci_dev(dev->parent);
  56         int reg = to_sensor_dev_attr(devattr)->index;
  57         long temp;
  58         u16 tsthr;
  59 
  60         pci_read_config_word(pdev, reg, &tsthr);
  61         temp = tsthr * 500;
  62 
  63         return sprintf(buf, "%ld\n", temp);
  64 }
  65 
  66 static ssize_t alarm_show(struct device *dev,
  67                           struct device_attribute *devattr, char *buf)
  68 {
  69         struct pci_dev *pdev = to_pci_dev(dev->parent);
  70         int nr = to_sensor_dev_attr(devattr)->index;
  71         u8 ctsts;
  72 
  73         pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
  74         return sprintf(buf, "%u\n", (unsigned int)ctsts & (1 << nr));
  75 }
  76 
  77 static DEVICE_ATTR_RO(temp1_input);
  78 static SENSOR_DEVICE_ATTR_RO(temp1_crit, thresh, 0xE2);
  79 static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, thresh, 0xEC);
  80 static SENSOR_DEVICE_ATTR_RO(temp1_max, thresh, 0xEE);
  81 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
  82 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 1);
  83 
  84 static struct attribute *i5500_temp_attrs[] = {
  85         &dev_attr_temp1_input.attr,
  86         &sensor_dev_attr_temp1_crit.dev_attr.attr,
  87         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
  88         &sensor_dev_attr_temp1_max.dev_attr.attr,
  89         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
  90         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
  91         NULL
  92 };
  93 
  94 ATTRIBUTE_GROUPS(i5500_temp);
  95 
  96 static const struct pci_device_id i5500_temp_ids[] = {
  97         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) },
  98         { 0 },
  99 };
 100 
 101 MODULE_DEVICE_TABLE(pci, i5500_temp_ids);
 102 
 103 static int i5500_temp_probe(struct pci_dev *pdev,
 104                             const struct pci_device_id *id)
 105 {
 106         int err;
 107         struct device *hwmon_dev;
 108         u32 tstimer;
 109         s8 tsfsc;
 110 
 111         err = pci_enable_device(pdev);
 112         if (err) {
 113                 dev_err(&pdev->dev, "Failed to enable device\n");
 114                 return err;
 115         }
 116 
 117         pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
 118         pci_read_config_dword(pdev, REG_TSTIMER, &tstimer);
 119         if (tsfsc == 0x7F && tstimer == 0x07D30D40) {
 120                 dev_notice(&pdev->dev, "Sensor seems to be disabled\n");
 121                 return -ENODEV;
 122         }
 123 
 124         hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
 125                                                            "intel5500", NULL,
 126                                                            i5500_temp_groups);
 127         return PTR_ERR_OR_ZERO(hwmon_dev);
 128 }
 129 
 130 static struct pci_driver i5500_temp_driver = {
 131         .name = "i5500_temp",
 132         .id_table = i5500_temp_ids,
 133         .probe = i5500_temp_probe,
 134 };
 135 
 136 module_pci_driver(i5500_temp_driver);
 137 
 138 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
 139 MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
 140 MODULE_LICENSE("GPL");