Code:
/*
* k10temp.c - Linux kernel module for hardware monitoring
*
* Copyright (C) 2008 Rudolf Marek <r.marek@assembler.cz>
*
* Inspired from the k8temp driver.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/pci.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
/* 1000 / 8 = 125 no mask because we shift from bit 31 */
#define TEMP_FROM_REG(val) (((val) >> 21) * 125)
#define REG_TEMP 0xa4
struct k10temp_data {
struct device *hwmon_dev;
struct mutex update_lock;
const char *name;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* registers values */
u32 temp; /* raw value */
};
static struct k10temp_data *k10temp_update_device(struct device *dev)
{
struct k10temp_data *data = dev_get_drvdata(dev);
struct pci_dev *pdev = to_pci_dev(dev);
u8 tmp;
mutex_lock(&data->update_lock);
if (!data->valid
|| time_after(jiffies, data->last_updated + HZ)) {
pci_read_config_dword(pdev, REG_TEMP, &data->temp);
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
/*
* Sysfs stuff
*/
static ssize_t show_name(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct k10temp_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", data->name);
}
static ssize_t show_temp(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr =
to_sensor_dev_attr_2(devattr);
int core = attr->nr;
int place = attr->index;
struct k10temp_data *data = k10temp_update_device(dev);
return sprintf(buf, "%d\n",
TEMP_FROM_REG(data->temp));
}
/* core, place */
static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
static struct pci_device_id k10temp_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1203) },
{ 0 },
};
MODULE_DEVICE_TABLE(pci, k10temp_ids);
static int __devinit k10temp_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int err;
u8 scfg;
u32 temp;
struct k10temp_data *data;
if (!(data = kzalloc(sizeof(struct k10temp_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
data->name = "k10temp";
mutex_init(&data->update_lock);
dev_set_drvdata(&pdev->dev, data);
/* Register sysfs hooks */
err = device_create_file(&pdev->dev,
&sensor_dev_attr_temp1_input.dev_attr);
if (err)
goto exit_remove;
err = device_create_file(&pdev->dev, &dev_attr_name);
if (err)
goto exit_remove;
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove;
}
return 0;
exit_remove:
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp1_input.dev_attr);
device_remove_file(&pdev->dev, &dev_attr_name);
exit_free:
dev_set_drvdata(&pdev->dev, NULL);
kfree(data);
exit:
return err;
}
static void __devexit k10temp_remove(struct pci_dev *pdev)
{
struct k10temp_data *data = dev_get_drvdata(&pdev->dev);
hwmon_device_unregister(data->hwmon_dev);
device_remove_file(&pdev->dev,
&sensor_dev_attr_temp1_input.dev_attr);
device_remove_file(&pdev->dev, &dev_attr_name);
dev_set_drvdata(&pdev->dev, NULL);
kfree(data);
}
static struct pci_driver k10temp_driver = {
.name = "k10temp",
.id_table = k10temp_ids,
.probe = k10temp_probe,
.remove = __devexit_p(k10temp_remove),
};
static int __init k10temp_init(void)
{
return pci_register_driver(&k10temp_driver);
}
static void __exit k10temp_exit(void)
{
pci_unregister_driver(&k10temp_driver);
}
MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
MODULE_DESCRIPTION("AMD K10 core temperature monitor");
MODULE_LICENSE("GPL");
module_init(k10temp_init)
module_exit(k10temp_exit)
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