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/device.h> 12 #include <linux/pci.h> 13 #include <linux/hwmon.h> 14 #include <linux/err.h> 15 16 /* Register definitions from datasheet */ 17 #define REG_TSTHRCATA 0xE2 18 #define REG_TSCTRL 0xE8 19 #define REG_TSTHRRPEX 0xEB 20 #define REG_TSTHRLO 0xEC 21 #define REG_TSTHRHI 0xEE 22 #define REG_CTHINT 0xF0 23 #define REG_TSFSC 0xF3 24 #define REG_CTSTS 0xF4 25 #define REG_TSTHRRQPI 0xF5 26 #define REG_CTCTRL 0xF7 27 #define REG_TSTIMER 0xF8 28 29 static int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 30 long *val) 31 { 32 struct pci_dev *pdev = to_pci_dev(dev->parent); 33 u16 tsthr; 34 s8 tsfsc; 35 u8 ctsts; 36 37 switch (type) { 38 case hwmon_temp: 39 switch (attr) { 40 /* Sensor resolution : 0.5 degree C */ 41 case hwmon_temp_input: 42 pci_read_config_word(pdev, REG_TSTHRHI, &tsthr); 43 pci_read_config_byte(pdev, REG_TSFSC, &tsfsc); 44 *val = (tsthr - tsfsc) * 500; 45 return 0; 46 case hwmon_temp_max: 47 pci_read_config_word(pdev, REG_TSTHRHI, &tsthr); 48 *val = tsthr * 500; 49 return 0; 50 case hwmon_temp_max_hyst: 51 pci_read_config_word(pdev, REG_TSTHRLO, &tsthr); 52 *val = tsthr * 500; 53 return 0; 54 case hwmon_temp_crit: 55 pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr); 56 *val = tsthr * 500; 57 return 0; 58 case hwmon_temp_max_alarm: 59 pci_read_config_byte(pdev, REG_CTSTS, &ctsts); 60 *val = !!(ctsts & BIT(1)); 61 return 0; 62 case hwmon_temp_crit_alarm: 63 pci_read_config_byte(pdev, REG_CTSTS, &ctsts); 64 *val = !!(ctsts & BIT(0)); 65 return 0; 66 default: 67 break; 68 } 69 break; 70 default: 71 break; 72 } 73 74 return -EOPNOTSUPP; 75 } 76 77 static const struct hwmon_ops i5500_ops = { 78 .visible = 0444, 79 .read = i5500_read, 80 }; 81 82 static const struct hwmon_channel_info * const i5500_info[] = { 83 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), 84 HWMON_CHANNEL_INFO(temp, 85 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT | 86 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM 87 ), 88 NULL 89 }; 90 91 static const struct hwmon_chip_info i5500_chip_info = { 92 .ops = &i5500_ops, 93 .info = i5500_info, 94 }; 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 = pcim_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_info(&pdev->dev, "intel5500", NULL, 125 &i5500_chip_info, NULL); 126 return PTR_ERR_OR_ZERO(hwmon_dev); 127 } 128 129 static struct pci_driver i5500_temp_driver = { 130 .name = "i5500_temp", 131 .id_table = i5500_temp_ids, 132 .probe = i5500_temp_probe, 133 }; 134 135 module_pci_driver(i5500_temp_driver); 136 137 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 138 MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver"); 139 MODULE_LICENSE("GPL"); 140