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 umode_t i5500_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, 33 int channel) 34 { 35 return 0444; 36 } 37 38 static int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 39 long *val) 40 { 41 struct pci_dev *pdev = to_pci_dev(dev->parent); 42 u16 tsthr; 43 s8 tsfsc; 44 u8 ctsts; 45 46 switch (type) { 47 case hwmon_temp: 48 switch (attr) { 49 /* Sensor resolution : 0.5 degree C */ 50 case hwmon_temp_input: 51 pci_read_config_word(pdev, REG_TSTHRHI, &tsthr); 52 pci_read_config_byte(pdev, REG_TSFSC, &tsfsc); 53 *val = (tsthr - tsfsc) * 500; 54 return 0; 55 case hwmon_temp_max: 56 pci_read_config_word(pdev, REG_TSTHRHI, &tsthr); 57 *val = tsthr * 500; 58 return 0; 59 case hwmon_temp_max_hyst: 60 pci_read_config_word(pdev, REG_TSTHRLO, &tsthr); 61 *val = tsthr * 500; 62 return 0; 63 case hwmon_temp_crit: 64 pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr); 65 *val = tsthr * 500; 66 return 0; 67 case hwmon_temp_max_alarm: 68 pci_read_config_byte(pdev, REG_CTSTS, &ctsts); 69 *val = !!(ctsts & BIT(1)); 70 return 0; 71 case hwmon_temp_crit_alarm: 72 pci_read_config_byte(pdev, REG_CTSTS, &ctsts); 73 *val = !!(ctsts & BIT(0)); 74 return 0; 75 default: 76 break; 77 } 78 break; 79 default: 80 break; 81 } 82 83 return -EOPNOTSUPP; 84 } 85 86 static const struct hwmon_ops i5500_ops = { 87 .is_visible = i5500_is_visible, 88 .read = i5500_read, 89 }; 90 91 static const struct hwmon_channel_info *i5500_info[] = { 92 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), 93 HWMON_CHANNEL_INFO(temp, 94 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT | 95 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM 96 ), 97 NULL 98 }; 99 100 static const struct hwmon_chip_info i5500_chip_info = { 101 .ops = &i5500_ops, 102 .info = i5500_info, 103 }; 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_info(&pdev->dev, "intel5500", NULL, 134 &i5500_chip_info, NULL); 135 return PTR_ERR_OR_ZERO(hwmon_dev); 136 } 137 138 static struct pci_driver i5500_temp_driver = { 139 .name = "i5500_temp", 140 .id_table = i5500_temp_ids, 141 .probe = i5500_temp_probe, 142 }; 143 144 module_pci_driver(i5500_temp_driver); 145 146 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 147 MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver"); 148 MODULE_LICENSE("GPL"); 149