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hwmon: Add driver for VIA CPU core temperature
This is a driver for the on-die digital temperature sensor of VIA's recent CPU models. [JD: Misc clean-ups.] Signed-off-by: Harald Welte <HaraldWelte@viatech.com> Cc: Juerg Haefliger <juergh@gmail.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> Tested-by: Adam Nielsen <a.nielsen@shikadi.net>
This commit is contained in:
Harald Welte
Jean Delvare
parent
fa0bff0223
commit
70c38772ae
3 changed files with 365 additions and 0 deletions
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@ -822,6 +822,14 @@ config SENSORS_TMP421
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This driver can also be built as a module. If so, the module
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will be called tmp421.
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config SENSORS_VIA_CPUTEMP
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tristate "VIA CPU temperature sensor"
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depends on X86
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help
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If you say yes here you get support for the temperature
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sensor inside your CPU. Supported are all known variants of
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the VIA C7 and Nano.
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config SENSORS_VIA686A
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tristate "VIA686A"
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depends on PCI
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@ -88,6 +88,7 @@ obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
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obj-$(CONFIG_SENSORS_THMC50) += thmc50.o
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obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
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obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
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obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
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obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
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obj-$(CONFIG_SENSORS_VT1211) += vt1211.o
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obj-$(CONFIG_SENSORS_VT8231) += vt8231.o
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356
drivers/hwmon/via-cputemp.c
Normal file
356
drivers/hwmon/via-cputemp.c
Normal file
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@ -0,0 +1,356 @@
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/*
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* via-cputemp.c - Driver for VIA CPU core temperature monitoring
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* Copyright (C) 2009 VIA Technologies, Inc.
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*
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* based on existing coretemp.c, which is
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*
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* Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
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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; version 2 of the License.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA.
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*/
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#include <linux/module.h>
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#include <linux/delay.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/hwmon.h>
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#include <linux/sysfs.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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#include <linux/list.h>
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#include <linux/platform_device.h>
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#include <linux/cpu.h>
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#include <asm/msr.h>
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#include <asm/processor.h>
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#define DRVNAME "via_cputemp"
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enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME } SHOW;
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/*
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* Functions declaration
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*/
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struct via_cputemp_data {
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struct device *hwmon_dev;
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const char *name;
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u32 id;
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u32 msr;
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};
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/*
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* Sysfs stuff
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*/
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static ssize_t show_name(struct device *dev, struct device_attribute
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*devattr, char *buf)
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{
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int ret;
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct via_cputemp_data *data = dev_get_drvdata(dev);
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if (attr->index == SHOW_NAME)
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ret = sprintf(buf, "%s\n", data->name);
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else /* show label */
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ret = sprintf(buf, "Core %d\n", data->id);
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return ret;
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}
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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 via_cputemp_data *data = dev_get_drvdata(dev);
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u32 eax, edx;
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int err;
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err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx);
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if (err)
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return -EAGAIN;
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return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
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SHOW_TEMP);
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static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
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static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
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static struct attribute *via_cputemp_attributes[] = {
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&sensor_dev_attr_name.dev_attr.attr,
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&sensor_dev_attr_temp1_label.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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NULL
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};
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static const struct attribute_group via_cputemp_group = {
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.attrs = via_cputemp_attributes,
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};
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static int __devinit via_cputemp_probe(struct platform_device *pdev)
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{
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struct via_cputemp_data *data;
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struct cpuinfo_x86 *c = &cpu_data(pdev->id);
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int err;
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u32 eax, edx;
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data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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dev_err(&pdev->dev, "Out of memory\n");
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goto exit;
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}
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data->id = pdev->id;
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data->name = "via_cputemp";
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switch (c->x86_model) {
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case 0xA:
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/* C7 A */
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case 0xD:
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/* C7 D */
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data->msr = 0x1169;
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break;
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case 0xF:
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/* Nano */
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data->msr = 0x1423;
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break;
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default:
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err = -ENODEV;
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goto exit_free;
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}
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/* test if we can access the TEMPERATURE MSR */
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err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx);
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if (err) {
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dev_err(&pdev->dev,
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"Unable to access TEMPERATURE MSR, giving up\n");
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goto exit_free;
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}
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platform_set_drvdata(pdev, data);
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err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
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if (err)
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goto exit_free;
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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dev_err(&pdev->dev, "Class registration failed (%d)\n",
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err);
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goto exit_remove;
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}
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return 0;
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exit_remove:
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sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
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exit_free:
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platform_set_drvdata(pdev, NULL);
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kfree(data);
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exit:
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return err;
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}
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static int __devexit via_cputemp_remove(struct platform_device *pdev)
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{
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struct via_cputemp_data *data = platform_get_drvdata(pdev);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
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platform_set_drvdata(pdev, NULL);
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kfree(data);
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return 0;
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}
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static struct platform_driver via_cputemp_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = DRVNAME,
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},
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.probe = via_cputemp_probe,
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.remove = __devexit_p(via_cputemp_remove),
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};
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struct pdev_entry {
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struct list_head list;
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struct platform_device *pdev;
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unsigned int cpu;
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};
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static LIST_HEAD(pdev_list);
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static DEFINE_MUTEX(pdev_list_mutex);
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static int __cpuinit via_cputemp_device_add(unsigned int cpu)
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{
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int err;
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struct platform_device *pdev;
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struct pdev_entry *pdev_entry;
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pdev = platform_device_alloc(DRVNAME, cpu);
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if (!pdev) {
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err = -ENOMEM;
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printk(KERN_ERR DRVNAME ": Device allocation failed\n");
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goto exit;
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}
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pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
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if (!pdev_entry) {
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err = -ENOMEM;
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goto exit_device_put;
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}
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err = platform_device_add(pdev);
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if (err) {
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printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
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err);
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goto exit_device_free;
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}
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pdev_entry->pdev = pdev;
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pdev_entry->cpu = cpu;
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mutex_lock(&pdev_list_mutex);
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list_add_tail(&pdev_entry->list, &pdev_list);
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mutex_unlock(&pdev_list_mutex);
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return 0;
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exit_device_free:
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kfree(pdev_entry);
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exit_device_put:
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platform_device_put(pdev);
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exit:
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return err;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void via_cputemp_device_remove(unsigned int cpu)
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{
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struct pdev_entry *p, *n;
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mutex_lock(&pdev_list_mutex);
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list_for_each_entry_safe(p, n, &pdev_list, list) {
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if (p->cpu == cpu) {
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platform_device_unregister(p->pdev);
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list_del(&p->list);
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kfree(p);
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}
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}
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mutex_unlock(&pdev_list_mutex);
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}
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static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long) hcpu;
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switch (action) {
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case CPU_ONLINE:
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case CPU_DOWN_FAILED:
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via_cputemp_device_add(cpu);
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break;
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case CPU_DOWN_PREPARE:
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via_cputemp_device_remove(cpu);
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block via_cputemp_cpu_notifier __refdata = {
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.notifier_call = via_cputemp_cpu_callback,
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};
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#endif /* !CONFIG_HOTPLUG_CPU */
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static int __init via_cputemp_init(void)
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{
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int i, err;
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struct pdev_entry *p, *n;
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if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) {
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printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n");
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err = -ENODEV;
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goto exit;
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}
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err = platform_driver_register(&via_cputemp_driver);
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if (err)
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goto exit;
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for_each_online_cpu(i) {
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struct cpuinfo_x86 *c = &cpu_data(i);
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if (c->x86 != 6)
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continue;
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if (c->x86_model < 0x0a)
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continue;
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if (c->x86_model > 0x0f) {
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printk(KERN_WARNING DRVNAME ": Unknown CPU "
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"model 0x%x\n", c->x86_model);
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continue;
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}
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err = via_cputemp_device_add(i);
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if (err)
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goto exit_devices_unreg;
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}
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if (list_empty(&pdev_list)) {
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err = -ENODEV;
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goto exit_driver_unreg;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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register_hotcpu_notifier(&via_cputemp_cpu_notifier);
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#endif
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return 0;
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exit_devices_unreg:
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mutex_lock(&pdev_list_mutex);
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list_for_each_entry_safe(p, n, &pdev_list, list) {
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platform_device_unregister(p->pdev);
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list_del(&p->list);
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kfree(p);
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}
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mutex_unlock(&pdev_list_mutex);
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exit_driver_unreg:
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platform_driver_unregister(&via_cputemp_driver);
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exit:
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return err;
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}
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static void __exit via_cputemp_exit(void)
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{
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struct pdev_entry *p, *n;
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#ifdef CONFIG_HOTPLUG_CPU
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unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
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#endif
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mutex_lock(&pdev_list_mutex);
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list_for_each_entry_safe(p, n, &pdev_list, list) {
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platform_device_unregister(p->pdev);
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list_del(&p->list);
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kfree(p);
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}
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mutex_unlock(&pdev_list_mutex);
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platform_driver_unregister(&via_cputemp_driver);
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}
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MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
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MODULE_DESCRIPTION("VIA CPU temperature monitor");
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MODULE_LICENSE("GPL");
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module_init(via_cputemp_init)
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module_exit(via_cputemp_exit)
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