forked from Minki/linux
hwmon: New coretemp driver
Add the support for the digital temperature sensor found in recent Intel Core CPUs. Signed-off-by: Rudolf Marek <r.marek@assembler.cz> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Rudolf Marek
Jean Delvare
parent
78a62d2c98
commit
bebe467823
@ -1031,6 +1031,12 @@ P: Simon Arlott
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M: cxacru@fire.lp0.eu
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S: Maintained
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CORETEMP HARDWARE MONITORING DRIVER
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P: Rudolf Marek
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M: r.marek@assembler.cz
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L: lm-sensors@lm-sensors.org
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S: Maintained
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COSA/SRP SYNC SERIAL DRIVER
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P: Jan "Yenya" Kasprzak
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M: kas@fi.muni.cz
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@ -229,6 +229,14 @@ config SENSORS_GL520SM
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This driver can also be built as a module. If so, the module
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will be called gl520sm.
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config SENSORS_CORETEMP
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tristate "Intel Core (2) Duo/Solo temperature sensor"
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depends on HWMON && X86 && EXPERIMENTAL
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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 all are all known variants
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of Intel Core family.
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config SENSORS_IT87
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tristate "ITE IT87xx and compatibles"
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depends on HWMON && I2C
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@ -22,6 +22,7 @@ obj-$(CONFIG_SENSORS_ADM1031) += adm1031.o
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obj-$(CONFIG_SENSORS_ADM9240) += adm9240.o
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obj-$(CONFIG_SENSORS_AMS) += ams/
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obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
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obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
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obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
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obj-$(CONFIG_SENSORS_F71805F) += f71805f.o
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obj-$(CONFIG_SENSORS_FSCHER) += fscher.o
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406
drivers/hwmon/coretemp.c
Normal file
406
drivers/hwmon/coretemp.c
Normal file
@ -0,0 +1,406 @@
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/*
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* coretemp.c - Linux kernel module for hardware monitoring
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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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* Inspired from many hwmon drivers
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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 "coretemp"
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typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_LABEL, SHOW_NAME } SHOW;
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/*
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* Functions declaration
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*/
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static struct coretemp_data *coretemp_update_device(struct device *dev);
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struct coretemp_data {
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struct class_device *class_dev;
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struct mutex update_lock;
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const char *name;
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u32 id;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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int temp;
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int tjmax;
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u8 alarm;
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};
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static struct coretemp_data *coretemp_update_device(struct device *dev);
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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 coretemp_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_alarm(struct device *dev, struct device_attribute
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*devattr, char *buf)
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{
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struct coretemp_data *data = coretemp_update_device(dev);
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/* read the Out-of-spec log, never clear */
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return sprintf(buf, "%d\n", data->alarm);
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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 sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct coretemp_data *data = coretemp_update_device(dev);
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int err;
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if (attr->index == SHOW_TEMP)
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err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN;
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else
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err = sprintf(buf, "%d\n", data->tjmax);
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return err;
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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_crit, S_IRUGO, show_temp, NULL,
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SHOW_TJMAX);
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static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
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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 *coretemp_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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&dev_attr_temp1_crit_alarm.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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NULL
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};
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static const struct attribute_group coretemp_group = {
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.attrs = coretemp_attributes,
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};
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static struct coretemp_data *coretemp_update_device(struct device *dev)
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{
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struct coretemp_data *data = dev_get_drvdata(dev);
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mutex_lock(&data->update_lock);
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if (!data->valid || time_after(jiffies, data->last_updated + HZ)) {
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u32 eax, edx;
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data->valid = 0;
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rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
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data->alarm = (eax >> 5) & 1;
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/* update only if data has been valid */
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if (eax & 0x80000000) {
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data->temp = data->tjmax - (((eax >> 16)
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& 0x7f) * 1000);
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data->valid = 1;
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} else {
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dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax);
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}
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data->last_updated = jiffies;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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static int __devinit coretemp_probe(struct platform_device *pdev)
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{
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struct coretemp_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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if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) {
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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 = "coretemp";
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mutex_init(&data->update_lock);
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/* Tjmax default is 100 degrees C */
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data->tjmax = 100000;
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/* test if we can access the THERM_STATUS MSR */
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err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
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if (err) {
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dev_err(&pdev->dev,
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"Unable to access THERM_STATUS MSR, giving up\n");
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goto exit_free;
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}
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/* Some processors have Tjmax 85 following magic should detect it
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Intel won't disclose the information without signed NDA, but
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individuals cannot sign it. Catch(ed) 22.
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*/
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if (((c->x86_model == 0xf) && (c->x86_mask > 3)) ||
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(c->x86_model == 0xe)) {
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err = rdmsr_safe_on_cpu(data->id, 0xee, &eax, &edx);
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if (err) {
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dev_warn(&pdev->dev,
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"Unable to access MSR 0xEE, Tjmax left at %d "
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"degrees C\n", data->tjmax/1000);
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} else if (eax & 0x40000000) {
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data->tjmax = 85000;
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}
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}
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platform_set_drvdata(pdev, data);
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if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
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goto exit_free;
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data->class_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->class_dev)) {
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err = PTR_ERR(data->class_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_class;
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}
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return 0;
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exit_class:
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sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
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exit_free:
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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 coretemp_remove(struct platform_device *pdev)
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{
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struct coretemp_data *data = platform_get_drvdata(pdev);
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hwmon_device_unregister(data->class_dev);
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sysfs_remove_group(&pdev->dev.kobj, &coretemp_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 coretemp_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 = coretemp_probe,
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.remove = __devexit_p(coretemp_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 coretemp_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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void coretemp_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 coretemp_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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coretemp_device_add(cpu);
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break;
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case CPU_DEAD:
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coretemp_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 __cpuinitdata coretemp_cpu_notifier = {
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.notifier_call = coretemp_cpu_callback,
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};
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#endif /* !CONFIG_HOTPLUG_CPU */
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static int __init coretemp_init(void)
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{
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int i, err = -ENODEV;
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struct pdev_entry *p, *n;
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printk(KERN_NOTICE DRVNAME ": This driver uses undocumented features "
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"of Core CPU. Temperature might be wrong!\n");
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/* quick check if we run Intel */
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if (cpu_data[0].x86_vendor != X86_VENDOR_INTEL)
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goto exit;
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err = platform_driver_register(&coretemp_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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/* check if family 6, models e, f */
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if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
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!((c->x86_model == 0xe) || (c->x86_model == 0xf))) {
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/* supported CPU not found, but report the unknown
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family 6 CPU */
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if ((c->x86 == 0x6) && (c->x86_model > 0xf))
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printk(KERN_WARNING DRVNAME ": Unknown CPU "
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"model %x\n", c->x86_model);
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continue;
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}
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err = coretemp_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(&coretemp_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(&coretemp_driver);
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exit:
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return err;
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}
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static void __exit coretemp_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(&coretemp_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(&coretemp_driver);
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}
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MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
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MODULE_DESCRIPTION("Intel Core temperature monitor");
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MODULE_LICENSE("GPL");
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module_init(coretemp_init)
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module_exit(coretemp_exit)
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