i5500_temp.c 3.5 KB

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  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. #include <linux/bitops.h>
  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/err.h>
  16. #include <linux/mutex.h>
  17. /* Register definitions from datasheet */
  18. #define REG_TSTHRCATA 0xE2
  19. #define REG_TSCTRL 0xE8
  20. #define REG_TSTHRRPEX 0xEB
  21. #define REG_TSTHRLO 0xEC
  22. #define REG_TSTHRHI 0xEE
  23. #define REG_CTHINT 0xF0
  24. #define REG_TSFSC 0xF3
  25. #define REG_CTSTS 0xF4
  26. #define REG_TSTHRRQPI 0xF5
  27. #define REG_CTCTRL 0xF7
  28. #define REG_TSTIMER 0xF8
  29. static umode_t i5500_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
  30. int channel)
  31. {
  32. return 0444;
  33. }
  34. static int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
  35. long *val)
  36. {
  37. struct pci_dev *pdev = to_pci_dev(dev->parent);
  38. u16 tsthr;
  39. s8 tsfsc;
  40. u8 ctsts;
  41. switch (type) {
  42. case hwmon_temp:
  43. switch (attr) {
  44. /* Sensor resolution : 0.5 degree C */
  45. case hwmon_temp_input:
  46. pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
  47. pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
  48. *val = (tsthr - tsfsc) * 500;
  49. return 0;
  50. case hwmon_temp_max:
  51. pci_read_config_word(pdev, REG_TSTHRHI, &tsthr);
  52. *val = tsthr * 500;
  53. return 0;
  54. case hwmon_temp_max_hyst:
  55. pci_read_config_word(pdev, REG_TSTHRLO, &tsthr);
  56. *val = tsthr * 500;
  57. return 0;
  58. case hwmon_temp_crit:
  59. pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr);
  60. *val = tsthr * 500;
  61. return 0;
  62. case hwmon_temp_max_alarm:
  63. pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
  64. *val = !!(ctsts & BIT(1));
  65. return 0;
  66. case hwmon_temp_crit_alarm:
  67. pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
  68. *val = !!(ctsts & BIT(0));
  69. return 0;
  70. default:
  71. break;
  72. }
  73. break;
  74. default:
  75. break;
  76. }
  77. return -EOPNOTSUPP;
  78. }
  79. static const struct hwmon_ops i5500_ops = {
  80. .is_visible = i5500_is_visible,
  81. .read = i5500_read,
  82. };
  83. static const struct hwmon_channel_info *i5500_info[] = {
  84. HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
  85. HWMON_CHANNEL_INFO(temp,
  86. HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
  87. HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM
  88. ),
  89. NULL
  90. };
  91. static const struct hwmon_chip_info i5500_chip_info = {
  92. .ops = &i5500_ops,
  93. .info = i5500_info,
  94. };
  95. static const struct pci_device_id i5500_temp_ids[] = {
  96. { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) },
  97. { 0 },
  98. };
  99. MODULE_DEVICE_TABLE(pci, i5500_temp_ids);
  100. static int i5500_temp_probe(struct pci_dev *pdev,
  101. const struct pci_device_id *id)
  102. {
  103. int err;
  104. struct device *hwmon_dev;
  105. u32 tstimer;
  106. s8 tsfsc;
  107. err = pcim_enable_device(pdev);
  108. if (err) {
  109. dev_err(&pdev->dev, "Failed to enable device\n");
  110. return err;
  111. }
  112. pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
  113. pci_read_config_dword(pdev, REG_TSTIMER, &tstimer);
  114. if (tsfsc == 0x7F && tstimer == 0x07D30D40) {
  115. dev_notice(&pdev->dev, "Sensor seems to be disabled\n");
  116. return -ENODEV;
  117. }
  118. hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "intel5500", NULL,
  119. &i5500_chip_info, NULL);
  120. return PTR_ERR_OR_ZERO(hwmon_dev);
  121. }
  122. static struct pci_driver i5500_temp_driver = {
  123. .name = "i5500_temp",
  124. .id_table = i5500_temp_ids,
  125. .probe = i5500_temp_probe,
  126. };
  127. module_pci_driver(i5500_temp_driver);
  128. MODULE_AUTHOR("Jean Delvare <[email protected]>");
  129. MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
  130. MODULE_LICENSE("GPL");