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"); 141