150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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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/hwmon-sysfs.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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/*
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* Sysfs stuff
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*/
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/* Sensor resolution : 0.5 degree C */
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static ssize_t show_temp(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev->parent);
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long temp;
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u16 tsthrhi;
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s8 tsfsc;
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pci_read_config_word(pdev, REG_TSTHRHI, &tsthrhi);
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pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
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temp = ((long)tsthrhi - tsfsc) * 500;
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return sprintf(buf, "%ld\n", temp);
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}
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static ssize_t show_thresh(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev->parent);
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int reg = to_sensor_dev_attr(devattr)->index;
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long temp;
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u16 tsthr;
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pci_read_config_word(pdev, reg, &tsthr);
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temp = tsthr * 500;
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return sprintf(buf, "%ld\n", temp);
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}
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static ssize_t show_alarm(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev->parent);
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int nr = to_sensor_dev_attr(devattr)->index;
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u8 ctsts;
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pci_read_config_byte(pdev, REG_CTSTS, &ctsts);
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return sprintf(buf, "%u\n", (unsigned int)ctsts & (1 << nr));
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}
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_thresh, NULL, 0xE2);
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static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_thresh, NULL, 0xEC);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_thresh, NULL, 0xEE);
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static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
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static struct attribute *i5500_temp_attrs[] = {
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&dev_attr_temp1_input.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(i5500_temp);
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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 = pci_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_groups(&pdev->dev,
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"intel5500", NULL,
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i5500_temp_groups);
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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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