diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/coretemp.c | 406 |
3 files changed, 415 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 659a2abb3e90..e488d691da4a 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -229,6 +229,14 @@ config SENSORS_GL520SM This driver can also be built as a module. If so, the module will be called gl520sm. +config SENSORS_CORETEMP + tristate "Intel Core (2) Duo/Solo temperature sensor" + depends on HWMON && X86 && EXPERIMENTAL + help + If you say yes here you get support for the temperature + sensor inside your CPU. Supported all are all known variants + of Intel Core family. + config SENSORS_IT87 tristate "ITE IT87xx and compatibles" depends on HWMON && I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index bbbe86bf5da1..33780678bd4b 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_SENSORS_ADM1031) += adm1031.o obj-$(CONFIG_SENSORS_ADM9240) += adm9240.o obj-$(CONFIG_SENSORS_AMS) += ams/ obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o +obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o obj-$(CONFIG_SENSORS_DS1621) += ds1621.o obj-$(CONFIG_SENSORS_F71805F) += f71805f.o obj-$(CONFIG_SENSORS_FSCHER) += fscher.o diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c new file mode 100644 index 000000000000..03b1f650d1c4 --- /dev/null +++ b/drivers/hwmon/coretemp.c @@ -0,0 +1,406 @@ +/* + * coretemp.c - Linux kernel module for hardware monitoring + * + * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> + * + * Inspired from many hwmon drivers + * + * 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; version 2 of the License. + * + * 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/hwmon.h> +#include <linux/sysfs.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/list.h> +#include <linux/platform_device.h> +#include <linux/cpu.h> +#include <asm/msr.h> +#include <asm/processor.h> + +#define DRVNAME "coretemp" + +typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_LABEL, SHOW_NAME } SHOW; + +/* + * Functions declaration + */ + +static struct coretemp_data *coretemp_update_device(struct device *dev); + +struct coretemp_data { + struct class_device *class_dev; + struct mutex update_lock; + const char *name; + u32 id; + char valid; /* zero until following fields are valid */ + unsigned long last_updated; /* in jiffies */ + int temp; + int tjmax; + u8 alarm; +}; + +static struct coretemp_data *coretemp_update_device(struct device *dev); + +/* + * Sysfs stuff + */ + +static ssize_t show_name(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + int ret; + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct coretemp_data *data = dev_get_drvdata(dev); + + if (attr->index == SHOW_NAME) + ret = sprintf(buf, "%s\n", data->name); + else /* show label */ + ret = sprintf(buf, "Core %d\n", data->id); + return ret; +} + +static ssize_t show_alarm(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct coretemp_data *data = coretemp_update_device(dev); + /* read the Out-of-spec log, never clear */ + return sprintf(buf, "%d\n", data->alarm); +} + +static ssize_t show_temp(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct coretemp_data *data = coretemp_update_device(dev); + int err; + + if (attr->index == SHOW_TEMP) + err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; + else + err = sprintf(buf, "%d\n", data->tjmax); + + return err; +} + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, + SHOW_TEMP); +static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, + SHOW_TJMAX); +static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); +static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); +static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); + +static struct attribute *coretemp_attributes[] = { + &sensor_dev_attr_name.dev_attr.attr, + &sensor_dev_attr_temp1_label.dev_attr.attr, + &dev_attr_temp1_crit_alarm.attr, + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp1_crit.dev_attr.attr, + NULL +}; + +static const struct attribute_group coretemp_group = { + .attrs = coretemp_attributes, +}; + +static struct coretemp_data *coretemp_update_device(struct device *dev) +{ + struct coretemp_data *data = dev_get_drvdata(dev); + + mutex_lock(&data->update_lock); + + if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { + u32 eax, edx; + + data->valid = 0; + rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); + data->alarm = (eax >> 5) & 1; + /* update only if data has been valid */ + if (eax & 0x80000000) { + data->temp = data->tjmax - (((eax >> 16) + & 0x7f) * 1000); + data->valid = 1; + } else { + dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); + } + data->last_updated = jiffies; + } + + mutex_unlock(&data->update_lock); + return data; +} + +static int __devinit coretemp_probe(struct platform_device *pdev) +{ + struct coretemp_data *data; + struct cpuinfo_x86 *c = &(cpu_data)[pdev->id]; + int err; + u32 eax, edx; + + if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) { + err = -ENOMEM; + dev_err(&pdev->dev, "Out of memory\n"); + goto exit; + } + + data->id = pdev->id; + data->name = "coretemp"; + mutex_init(&data->update_lock); + /* Tjmax default is 100 degrees C */ + data->tjmax = 100000; + + /* test if we can access the THERM_STATUS MSR */ + err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); + if (err) { + dev_err(&pdev->dev, + "Unable to access THERM_STATUS MSR, giving up\n"); + goto exit_free; + } + + /* Some processors have Tjmax 85 following magic should detect it + Intel won't disclose the information without signed NDA, but + individuals cannot sign it. Catch(ed) 22. + */ + + if (((c->x86_model == 0xf) && (c->x86_mask > 3)) || + (c->x86_model == 0xe)) { + err = rdmsr_safe_on_cpu(data->id, 0xee, &eax, &edx); + if (err) { + dev_warn(&pdev->dev, + "Unable to access MSR 0xEE, Tjmax left at %d " + "degrees C\n", data->tjmax/1000); + } else if (eax & 0x40000000) { + data->tjmax = 85000; + } + } + + platform_set_drvdata(pdev, data); + + if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group))) + goto exit_free; + + data->class_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(data->class_dev)) { + err = PTR_ERR(data->class_dev); + dev_err(&pdev->dev, "Class registration failed (%d)\n", + err); + goto exit_class; + } + + return 0; + +exit_class: + sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); +exit_free: + kfree(data); +exit: + return err; +} + +static int __devexit coretemp_remove(struct platform_device *pdev) +{ + struct coretemp_data *data = platform_get_drvdata(pdev); + + hwmon_device_unregister(data->class_dev); + sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); + platform_set_drvdata(pdev, NULL); + kfree(data); + return 0; +} + +static struct platform_driver coretemp_driver = { + .driver = { + .owner = THIS_MODULE, + .name = DRVNAME, + }, + .probe = coretemp_probe, + .remove = __devexit_p(coretemp_remove), +}; + +struct pdev_entry { + struct list_head list; + struct platform_device *pdev; + unsigned int cpu; +}; + +static LIST_HEAD(pdev_list); +static DEFINE_MUTEX(pdev_list_mutex); + +static int __cpuinit coretemp_device_add(unsigned int cpu) +{ + int err; + struct platform_device *pdev; + struct pdev_entry *pdev_entry; + + pdev = platform_device_alloc(DRVNAME, cpu); + if (!pdev) { + err = -ENOMEM; + printk(KERN_ERR DRVNAME ": Device allocation failed\n"); + goto exit; + } + + pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); + if (!pdev_entry) { + err = -ENOMEM; + goto exit_device_put; + } + + err = platform_device_add(pdev); + if (err) { + printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", + err); + goto exit_device_free; + } + + pdev_entry->pdev = pdev; + pdev_entry->cpu = cpu; + mutex_lock(&pdev_list_mutex); + list_add_tail(&pdev_entry->list, &pdev_list); + mutex_unlock(&pdev_list_mutex); + + return 0; + +exit_device_free: + kfree(pdev_entry); +exit_device_put: + platform_device_put(pdev); +exit: + return err; +} + +#ifdef CONFIG_HOTPLUG_CPU +void coretemp_device_remove(unsigned int cpu) +{ + struct pdev_entry *p, *n; + mutex_lock(&pdev_list_mutex); + list_for_each_entry_safe(p, n, &pdev_list, list) { + if (p->cpu == cpu) { + platform_device_unregister(p->pdev); + list_del(&p->list); + kfree(p); + } + } + mutex_unlock(&pdev_list_mutex); +} + +static int coretemp_cpu_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long) hcpu; + + switch (action) { + case CPU_ONLINE: + coretemp_device_add(cpu); + break; + case CPU_DEAD: + coretemp_device_remove(cpu); + break; + } + return NOTIFY_OK; +} + +static struct notifier_block __cpuinitdata coretemp_cpu_notifier = { + .notifier_call = coretemp_cpu_callback, +}; +#endif /* !CONFIG_HOTPLUG_CPU */ + +static int __init coretemp_init(void) +{ + int i, err = -ENODEV; + struct pdev_entry *p, *n; + + printk(KERN_NOTICE DRVNAME ": This driver uses undocumented features " + "of Core CPU. Temperature might be wrong!\n"); + + /* quick check if we run Intel */ + if (cpu_data[0].x86_vendor != X86_VENDOR_INTEL) + goto exit; + + err = platform_driver_register(&coretemp_driver); + if (err) + goto exit; + + for_each_online_cpu(i) { + struct cpuinfo_x86 *c = &(cpu_data)[i]; + + /* check if family 6, models e, f */ + if ((c->cpuid_level < 0) || (c->x86 != 0x6) || + !((c->x86_model == 0xe) || (c->x86_model == 0xf))) { + + /* supported CPU not found, but report the unknown + family 6 CPU */ + if ((c->x86 == 0x6) && (c->x86_model > 0xf)) + printk(KERN_WARNING DRVNAME ": Unknown CPU " + "model %x\n", c->x86_model); + continue; + } + + err = coretemp_device_add(i); + if (err) + goto exit_devices_unreg; + } + if (list_empty(&pdev_list)) { + err = -ENODEV; + goto exit_driver_unreg; + } + +#ifdef CONFIG_HOTPLUG_CPU + register_hotcpu_notifier(&coretemp_cpu_notifier); +#endif + return 0; + +exit_devices_unreg: + mutex_lock(&pdev_list_mutex); + list_for_each_entry_safe(p, n, &pdev_list, list) { + platform_device_unregister(p->pdev); + list_del(&p->list); + kfree(p); + } + mutex_unlock(&pdev_list_mutex); +exit_driver_unreg: + platform_driver_unregister(&coretemp_driver); +exit: + return err; +} + +static void __exit coretemp_exit(void) +{ + struct pdev_entry *p, *n; +#ifdef CONFIG_HOTPLUG_CPU + unregister_hotcpu_notifier(&coretemp_cpu_notifier); +#endif + mutex_lock(&pdev_list_mutex); + list_for_each_entry_safe(p, n, &pdev_list, list) { + platform_device_unregister(p->pdev); + list_del(&p->list); + kfree(p); + } + mutex_unlock(&pdev_list_mutex); + platform_driver_unregister(&coretemp_driver); +} + +MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); +MODULE_DESCRIPTION("Intel Core temperature monitor"); +MODULE_LICENSE("GPL"); + +module_init(coretemp_init) +module_exit(coretemp_exit) |