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