1 /* 2 * i5500_temp - Driver for Intel 5500/5520/X58 chipset thermal sensor 3 * 4 * Copyright (C) 2012, 2014 Jean Delvare <jdelvare@suse.de> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/slab.h> 20 #include <linux/jiffies.h> 21 #include <linux/device.h> 22 #include <linux/pci.h> 23 #include <linux/hwmon.h> 24 #include <linux/hwmon-sysfs.h> 25 #include <linux/err.h> 26 #include <linux/mutex.h> 27 28 /* Register definitions from datasheet */ 29 #define REG_TSTHRCATA 0xE2 30 #define REG_TSCTRL 0xE8 31 #define REG_TSTHRRPEX 0xEB 32 #define REG_TSTHRLO 0xEC 33 #define REG_TSTHRHI 0xEE 34 #define REG_CTHINT 0xF0 35 #define REG_TSFSC 0xF3 36 #define REG_CTSTS 0xF4 37 #define REG_TSTHRRQPI 0xF5 38 #define REG_CTCTRL 0xF7 39 #define REG_TSTIMER 0xF8 40 41 /* 42 * Sysfs stuff 43 */ 44 45 /* Sensor resolution : 0.5 degree C */ 46 static ssize_t show_temp(struct device *dev, 47 struct device_attribute *devattr, char *buf) 48 { 49 struct pci_dev *pdev = to_pci_dev(dev->parent); 50 long temp; 51 u16 tsthrhi; 52 s8 tsfsc; 53 54 pci_read_config_word(pdev, REG_TSTHRHI, &tsthrhi); 55 pci_read_config_byte(pdev, REG_TSFSC, &tsfsc); 56 temp = ((long)tsthrhi - tsfsc) * 500; 57 58 return sprintf(buf, "%ld\n", temp); 59 } 60 61 static ssize_t show_thresh(struct device *dev, 62 struct device_attribute *devattr, char *buf) 63 { 64 struct pci_dev *pdev = to_pci_dev(dev->parent); 65 int reg = to_sensor_dev_attr(devattr)->index; 66 long temp; 67 u16 tsthr; 68 69 pci_read_config_word(pdev, reg, &tsthr); 70 temp = tsthr * 500; 71 72 return sprintf(buf, "%ld\n", temp); 73 } 74 75 static ssize_t show_alarm(struct device *dev, 76 struct device_attribute *devattr, char *buf) 77 { 78 struct pci_dev *pdev = to_pci_dev(dev->parent); 79 int nr = to_sensor_dev_attr(devattr)->index; 80 u8 ctsts; 81 82 pci_read_config_byte(pdev, REG_CTSTS, &ctsts); 83 return sprintf(buf, "%u\n", (unsigned int)ctsts & (1 << nr)); 84 } 85 86 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 87 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_thresh, NULL, 0xE2); 88 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_thresh, NULL, 0xEC); 89 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_thresh, NULL, 0xEE); 90 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); 91 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1); 92 93 static struct attribute *i5500_temp_attrs[] = { 94 &dev_attr_temp1_input.attr, 95 &sensor_dev_attr_temp1_crit.dev_attr.attr, 96 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 97 &sensor_dev_attr_temp1_max.dev_attr.attr, 98 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 99 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 100 NULL 101 }; 102 103 ATTRIBUTE_GROUPS(i5500_temp); 104 105 static const struct pci_device_id i5500_temp_ids[] = { 106 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) }, 107 { 0 }, 108 }; 109 110 MODULE_DEVICE_TABLE(pci, i5500_temp_ids); 111 112 static int i5500_temp_probe(struct pci_dev *pdev, 113 const struct pci_device_id *id) 114 { 115 int err; 116 struct device *hwmon_dev; 117 u32 tstimer; 118 s8 tsfsc; 119 120 err = pci_enable_device(pdev); 121 if (err) { 122 dev_err(&pdev->dev, "Failed to enable device\n"); 123 return err; 124 } 125 126 pci_read_config_byte(pdev, REG_TSFSC, &tsfsc); 127 pci_read_config_dword(pdev, REG_TSTIMER, &tstimer); 128 if (tsfsc == 0x7F && tstimer == 0x07D30D40) { 129 dev_notice(&pdev->dev, "Sensor seems to be disabled\n"); 130 return -ENODEV; 131 } 132 133 hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, 134 "intel5500", NULL, 135 i5500_temp_groups); 136 return PTR_ERR_OR_ZERO(hwmon_dev); 137 } 138 139 static struct pci_driver i5500_temp_driver = { 140 .name = "i5500_temp", 141 .id_table = i5500_temp_ids, 142 .probe = i5500_temp_probe, 143 }; 144 145 module_pci_driver(i5500_temp_driver); 146 147 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 148 MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver"); 149 MODULE_LICENSE("GPL"); 150