// SPDX-License-Identifier: GPL-2.0-or-later /* * i5500_temp - Driver for Intel 5500/5520/X58 chipset thermal sensor * * Copyright (C) 2012, 2014 Jean Delvare <jdelvare@suse.de> */ #include <linux/bitops.h> #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/device.h> #include <linux/pci.h> #include <linux/hwmon.h> #include <linux/err.h> #include <linux/mutex.h> /* Register definitions from datasheet */ #define REG_TSTHRCATA 0xE2 #define REG_TSCTRL 0xE8 #define REG_TSTHRRPEX 0xEB #define REG_TSTHRLO 0xEC #define REG_TSTHRHI 0xEE #define REG_CTHINT 0xF0 #define REG_TSFSC 0xF3 #define REG_CTSTS 0xF4 #define REG_TSTHRRQPI 0xF5 #define REG_CTCTRL 0xF7 #define REG_TSTIMER 0xF8 static umode_t i5500_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) { return 0444; } static int i5500_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { struct pci_dev *pdev = to_pci_dev(dev->parent); u16 tsthr; s8 tsfsc; u8 ctsts; switch (type) { case hwmon_temp: switch (attr) { /* Sensor resolution : 0.5 degree C */ case hwmon_temp_input: pci_read_config_word(pdev, REG_TSTHRHI, &tsthr); pci_read_config_byte(pdev, REG_TSFSC, &tsfsc); *val = (tsthr - tsfsc) * 500; return 0; case hwmon_temp_max: pci_read_config_word(pdev, REG_TSTHRHI, &tsthr); *val = tsthr * 500; return 0; case hwmon_temp_max_hyst: pci_read_config_word(pdev, REG_TSTHRLO, &tsthr); *val = tsthr * 500; return 0; case hwmon_temp_crit: pci_read_config_word(pdev, REG_TSTHRCATA, &tsthr); *val = tsthr * 500; return 0; case hwmon_temp_max_alarm: pci_read_config_byte(pdev, REG_CTSTS, &ctsts); *val = !!(ctsts & BIT(1)); return 0; case hwmon_temp_crit_alarm: pci_read_config_byte(pdev, REG_CTSTS, &ctsts); *val = !!(ctsts & BIT(0)); return 0; default: break; } break; default: break; } return -EOPNOTSUPP; } static const struct hwmon_ops i5500_ops = { .is_visible = i5500_is_visible, .read = i5500_read, }; static const struct hwmon_channel_info * const i5500_info[] = { HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM ), NULL }; static const struct hwmon_chip_info i5500_chip_info = { .ops = &i5500_ops, .info = i5500_info, }; static const struct pci_device_id i5500_temp_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x3438) }, { 0 }, }; MODULE_DEVICE_TABLE(pci, i5500_temp_ids); static int i5500_temp_probe(struct pci_dev *pdev, const struct pci_device_id *id) { int err; struct device *hwmon_dev; u32 tstimer; s8 tsfsc; err = pcim_enable_device(pdev); if (err) { dev_err(&pdev->dev, "Failed to enable device\n"); return err; } pci_read_config_byte(pdev, REG_TSFSC, &tsfsc); pci_read_config_dword(pdev, REG_TSTIMER, &tstimer); if (tsfsc == 0x7F && tstimer == 0x07D30D40) { dev_notice(&pdev->dev, "Sensor seems to be disabled\n"); return -ENODEV; } hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "intel5500", NULL, &i5500_chip_info, NULL); return PTR_ERR_OR_ZERO(hwmon_dev); } static struct pci_driver i5500_temp_driver = { .name = "i5500_temp", .id_table = i5500_temp_ids, .probe = i5500_temp_probe, }; module_pci_driver(i5500_temp_driver); MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver"); MODULE_LICENSE("GPL");