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- // 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 <[email protected]>
- */
- #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 *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 <[email protected]>");
- MODULE_DESCRIPTION("Intel 5500/5520/X58 chipset thermal sensor driver");
- MODULE_LICENSE("GPL");
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