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 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 <jdelvare@suse.de>"); 141 MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver"); 142 MODULE_LICENSE("GPL"); 143