[linux-2.6-block.git] / drivers / hwmon / coretemp.c

/*
 * 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_TTARGET, SHOW_LABEL,
		SHOW_NAME } SHOW;

/*
 * Functions declaration
 */

static struct coretemp_data *coretemp_update_device(struct device *dev);

struct coretemp_data {
	struct device *hwmon_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;
	int ttarget;
	u8 alarm;
};

/*
 * 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 if (attr->index == SHOW_TJMAX)
		err = sprintf(buf, "%d\n", data->tjmax);
	else
		err = sprintf(buf, "%d\n", data->ttarget);
	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 SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL,
			  SHOW_TTARGET);
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 adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
{
	/* The 100C is default for both mobile and non mobile CPUs */

	int tjmax = 100000;
	int usemsr_ee = 1;
	int err;
	u32 eax, edx;

	/* Early chips have no MSR for TjMax */

	if ((c->x86_model == 0xf) && (c->x86_mask < 4)) {
		usemsr_ee = 0;
	}

	/* Atoms seems to have TjMax at 90C */

	if (c->x86_model == 0x1c) {
		usemsr_ee = 0;
		tjmax = 90000;
	}

	if ((c->x86_model > 0xe) && (usemsr_ee)) {

		/* Now we can detect the mobile CPU using Intel provided table
		   http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
		   For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
		*/

		err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
		if (err) {
			dev_warn(dev,
				 "Unable to access MSR 0x17, assuming desktop"
				 " CPU\n");
			usemsr_ee = 0;
		} else if (!(eax & 0x10000000)) {
			usemsr_ee = 0;
		}
	}

	if (usemsr_ee) {

		err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
		if (err) {
			dev_warn(dev,
				 "Unable to access MSR 0xEE, for Tjmax, left"
				 " at default");
		} else if (eax & 0x40000000) {
			tjmax = 85000;
		}
	/* if we dont use msr EE it means we are desktop CPU (with exeception
	   of Atom) */
	} else if (tjmax == 100000) {
		dev_warn(dev, "Using relative temperature scale!\n");
	}

	return tjmax;
}

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);

	/* 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;
	}

	/* Check if we have problem with errata AE18 of Core processors:
	   Readings might stop update when processor visited too deep sleep,
	   fixed for stepping D0 (6EC).
	*/

	if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) {
		/* check for microcode update */
		rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx);
		if (edx < 0x39) {
			err = -ENODEV;
			dev_err(&pdev->dev,
				"Errata AE18 not fixed, update BIOS or "
				"microcode of the CPU!\n");
			goto exit_free;
		}
	}

	data->tjmax = adjust_tjmax(c, data->id, &pdev->dev);
	platform_set_drvdata(pdev, data);

	/* read the still undocumented IA32_TEMPERATURE_TARGET it exists
	   on older CPUs but not in this register, Atoms don't have it either */

	if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) {
		err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx);
		if (err) {
			dev_warn(&pdev->dev, "Unable to read"
					" IA32_TEMPERATURE_TARGET MSR\n");
		} else {
			data->ttarget = data->tjmax -
					(((eax >> 8) & 0xff) * 1000);
			err = device_create_file(&pdev->dev,
					&sensor_dev_attr_temp1_max.dev_attr);
			if (err)
				goto exit_free;
		}
	}

	if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
		goto exit_dev;

	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_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_dev:
	device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
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->hwmon_dev);
	sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
	device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
	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
static 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 __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
				 unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long) hcpu;

	switch (action) {
	case CPU_ONLINE:
	case CPU_DOWN_FAILED:
		coretemp_device_add(cpu);
		break;
	case CPU_DOWN_PREPARE:
		coretemp_device_remove(cpu);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block coretemp_cpu_notifier __refdata = {
	.notifier_call = coretemp_cpu_callback,
};
#endif				/* !CONFIG_HOTPLUG_CPU */

static int __init coretemp_init(void)
{
	int i, err = -ENODEV;
	struct pdev_entry *p, *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 0xe, 0xf, 0x16, 0x17, 0x1A, 0x1c */
		if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
		    !((c->x86_model == 0xe) || (c->x86_model == 0xf) ||
			(c->x86_model == 0x16) || (c->x86_model == 0x17) ||
			(c->x86_model == 0x1A) || (c->x86_model == 0x1c))) {

			/* 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)
Commit	Line	Data
bebe4678 RM	1	/*
	2	* coretemp.c - Linux kernel module for hardware monitoring
	3	*
	4	* Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
	5	*
	6	* Inspired from many hwmon drivers
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; version 2 of the License.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	20	* 02110-1301 USA.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/delay.h>
	25	#include <linux/init.h>
	26	#include <linux/slab.h>
	27	#include <linux/jiffies.h>
	28	#include <linux/hwmon.h>
	29	#include <linux/sysfs.h>
	30	#include <linux/hwmon-sysfs.h>
	31	#include <linux/err.h>
	32	#include <linux/mutex.h>
	33	#include <linux/list.h>
	34	#include <linux/platform_device.h>
	35	#include <linux/cpu.h>
	36	#include <asm/msr.h>
	37	#include <asm/processor.h>
	38
	39	#define DRVNAME "coretemp"
	40
6369a288 RM	41	typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL,
6369a288 RM	42	SHOW_NAME } SHOW;
bebe4678 RM	43
	44	/*
	45	* Functions declaration
	46	*/
	47
	48	static struct coretemp_data coretemp_update_device(struct device dev);
	49
	50	struct coretemp_data {
1beeffe4	51	struct device *hwmon_dev;
bebe4678 RM	52	struct mutex update_lock;
	53	const char *name;
	54	u32 id;
	55	char valid; /* zero until following fields are valid */
	56	unsigned long last_updated; /* in jiffies */
	57	int temp;
	58	int tjmax;
6369a288	59	int ttarget;
bebe4678 RM	60	u8 alarm;
	61	};
	62
bebe4678 RM	63	/*
	64	* Sysfs stuff
	65	*/
	66
	67	static ssize_t show_name(struct device *dev, struct device_attribute
	68	devattr, char buf)
	69	{
	70	int ret;
	71	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	72	struct coretemp_data *data = dev_get_drvdata(dev);
	73
	74	if (attr->index == SHOW_NAME)
	75	ret = sprintf(buf, "%s\n", data->name);
	76	else /* show label */
	77	ret = sprintf(buf, "Core %d\n", data->id);
	78	return ret;
	79	}
	80
	81	static ssize_t show_alarm(struct device *dev, struct device_attribute
	82	devattr, char buf)
	83	{
	84	struct coretemp_data *data = coretemp_update_device(dev);
	85	/* read the Out-of-spec log, never clear */
	86	return sprintf(buf, "%d\n", data->alarm);
	87	}
	88
	89	static ssize_t show_temp(struct device *dev,
	90	struct device_attribute devattr, char buf)
	91	{
	92	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	93	struct coretemp_data *data = coretemp_update_device(dev);
	94	int err;
	95
	96	if (attr->index == SHOW_TEMP)
	97	err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN;
6369a288	98	else if (attr->index == SHOW_TJMAX)
bebe4678	99	err = sprintf(buf, "%d\n", data->tjmax);
6369a288 RM	100	else
6369a288 RM	101	err = sprintf(buf, "%d\n", data->ttarget);
bebe4678 RM	102	return err;
	103	}
	104
	105	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
	106	SHOW_TEMP);
	107	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL,
	108	SHOW_TJMAX);
6369a288 RM	109	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL,
6369a288 RM	110	SHOW_TTARGET);
bebe4678 RM	111	static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
	112	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
	113	static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
	114
	115	static struct attribute *coretemp_attributes[] = {
	116	&sensor_dev_attr_name.dev_attr.attr,
	117	&sensor_dev_attr_temp1_label.dev_attr.attr,
	118	&dev_attr_temp1_crit_alarm.attr,
	119	&sensor_dev_attr_temp1_input.dev_attr.attr,
	120	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	121	NULL
	122	};
	123
	124	static const struct attribute_group coretemp_group = {
	125	.attrs = coretemp_attributes,
	126	};
	127
	128	static struct coretemp_data coretemp_update_device(struct device dev)
	129	{
	130	struct coretemp_data *data = dev_get_drvdata(dev);
	131
	132	mutex_lock(&data->update_lock);
	133
	134	if (!data->valid \|\| time_after(jiffies, data->last_updated + HZ)) {
	135	u32 eax, edx;
	136
	137	data->valid = 0;
	138	rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
	139	data->alarm = (eax >> 5) & 1;
	140	/* update only if data has been valid */
	141	if (eax & 0x80000000) {
	142	data->temp = data->tjmax - (((eax >> 16)
	143	& 0x7f) * 1000);
	144	data->valid = 1;
	145	} else {
	146	dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax);
	147	}
	148	data->last_updated = jiffies;
	149	}
	150
	151	mutex_unlock(&data->update_lock);
	152	return data;
	153	}
	154
118a8871 RM	155	static int __devinit adjust_tjmax(struct cpuinfo_x86 c, u32 id, struct device dev)
	156	{
	157	/* The 100C is default for both mobile and non mobile CPUs */
	158
	159	int tjmax = 100000;
708a62bc	160	int usemsr_ee = 1;
118a8871 RM	161	int err;
	162	u32 eax, edx;
	163
	164	/* Early chips have no MSR for TjMax */
	165
	166	if ((c->x86_model == 0xf) && (c->x86_mask < 4)) {
708a62bc	167	usemsr_ee = 0;
118a8871 RM	168	}
118a8871 RM	169
708a62bc RM	170	/* Atoms seems to have TjMax at 90C */
	171
	172	if (c->x86_model == 0x1c) {
	173	usemsr_ee = 0;
	174	tjmax = 90000;
	175	}
	176
	177	if ((c->x86_model > 0xe) && (usemsr_ee)) {
118a8871 RM	178
	179	/* Now we can detect the mobile CPU using Intel provided table
	180	http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
	181	For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
	182	*/
	183
	184	err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
	185	if (err) {
	186	dev_warn(dev,
	187	"Unable to access MSR 0x17, assuming desktop"
	188	" CPU\n");
708a62bc	189	usemsr_ee = 0;
118a8871	190	} else if (!(eax & 0x10000000)) {
708a62bc	191	usemsr_ee = 0;
118a8871 RM	192	}
	193	}
	194
708a62bc	195	if (usemsr_ee) {
118a8871 RM	196
	197	err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
	198	if (err) {
	199	dev_warn(dev,
	200	"Unable to access MSR 0xEE, for Tjmax, left"
	201	" at default");
	202	} else if (eax & 0x40000000) {
	203	tjmax = 85000;
	204	}
708a62bc RM	205	/* if we dont use msr EE it means we are desktop CPU (with exeception
	206	of Atom) */
	207	} else if (tjmax == 100000) {
118a8871 RM	208	dev_warn(dev, "Using relative temperature scale!\n");
	209	}
	210
	211	return tjmax;
	212	}
	213
bebe4678 RM	214	static int __devinit coretemp_probe(struct platform_device *pdev)
	215	{
	216	struct coretemp_data *data;
92cb7612	217	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
bebe4678 RM	218	int err;
	219	u32 eax, edx;
	220
	221	if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) {
	222	err = -ENOMEM;
	223	dev_err(&pdev->dev, "Out of memory\n");
	224	goto exit;
	225	}
	226
	227	data->id = pdev->id;
	228	data->name = "coretemp";
	229	mutex_init(&data->update_lock);
bebe4678 RM	230
	231	/* test if we can access the THERM_STATUS MSR */
	232	err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
	233	if (err) {
	234	dev_err(&pdev->dev,
	235	"Unable to access THERM_STATUS MSR, giving up\n");
	236	goto exit_free;
	237	}
	238
67f363b1 RM	239	/* Check if we have problem with errata AE18 of Core processors:
	240	Readings might stop update when processor visited too deep sleep,
	241	fixed for stepping D0 (6EC).
	242	*/
	243
	244	if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) {
	245	/* check for microcode update */
	246	rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx);
	247	if (edx < 0x39) {
6d79af70	248	err = -ENODEV;
67f363b1 RM	249	dev_err(&pdev->dev,
	250	"Errata AE18 not fixed, update BIOS or "
	251	"microcode of the CPU!\n");
	252	goto exit_free;
	253	}
	254	}
	255
118a8871	256	data->tjmax = adjust_tjmax(c, data->id, &pdev->dev);
bebe4678 RM	257	platform_set_drvdata(pdev, data);
bebe4678 RM	258
6369a288	259	/* read the still undocumented IA32_TEMPERATURE_TARGET it exists
708a62bc	260	on older CPUs but not in this register, Atoms don't have it either */
6369a288	261
708a62bc	262	if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) {
6369a288 RM	263	err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx);
	264	if (err) {
	265	dev_warn(&pdev->dev, "Unable to read"
	266	" IA32_TEMPERATURE_TARGET MSR\n");
	267	} else {
	268	data->ttarget = data->tjmax -
	269	(((eax >> 8) & 0xff) * 1000);
	270	err = device_create_file(&pdev->dev,
	271	&sensor_dev_attr_temp1_max.dev_attr);
	272	if (err)
	273	goto exit_free;
	274	}
	275	}
	276
bebe4678	277	if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
6369a288	278	goto exit_dev;
bebe4678	279
1beeffe4 TJ	280	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	281	if (IS_ERR(data->hwmon_dev)) {
	282	err = PTR_ERR(data->hwmon_dev);
bebe4678 RM	283	dev_err(&pdev->dev, "Class registration failed (%d)\n",
	284	err);
	285	goto exit_class;
	286	}
	287
	288	return 0;
	289
	290	exit_class:
	291	sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
6369a288 RM	292	exit_dev:
6369a288 RM	293	device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
bebe4678 RM	294	exit_free:
	295	kfree(data);
	296	exit:
	297	return err;
	298	}
	299
	300	static int __devexit coretemp_remove(struct platform_device *pdev)
	301	{
	302	struct coretemp_data *data = platform_get_drvdata(pdev);
	303
1beeffe4	304	hwmon_device_unregister(data->hwmon_dev);
bebe4678	305	sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
6369a288	306	device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
bebe4678 RM	307	platform_set_drvdata(pdev, NULL);
	308	kfree(data);
	309	return 0;
	310	}
	311
	312	static struct platform_driver coretemp_driver = {
	313	.driver = {
	314	.owner = THIS_MODULE,
	315	.name = DRVNAME,
	316	},
	317	.probe = coretemp_probe,
	318	.remove = __devexit_p(coretemp_remove),
	319	};
	320
	321	struct pdev_entry {
	322	struct list_head list;
	323	struct platform_device *pdev;
	324	unsigned int cpu;
	325	};
	326
	327	static LIST_HEAD(pdev_list);
	328	static DEFINE_MUTEX(pdev_list_mutex);
	329
	330	static int __cpuinit coretemp_device_add(unsigned int cpu)
	331	{
	332	int err;
	333	struct platform_device *pdev;
	334	struct pdev_entry *pdev_entry;
	335
	336	pdev = platform_device_alloc(DRVNAME, cpu);
	337	if (!pdev) {
	338	err = -ENOMEM;
	339	printk(KERN_ERR DRVNAME ": Device allocation failed\n");
	340	goto exit;
	341	}
	342
	343	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
	344	if (!pdev_entry) {
	345	err = -ENOMEM;
	346	goto exit_device_put;
	347	}
	348
	349	err = platform_device_add(pdev);
	350	if (err) {
	351	printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
	352	err);
	353	goto exit_device_free;
	354	}
	355
	356	pdev_entry->pdev = pdev;
	357	pdev_entry->cpu = cpu;
	358	mutex_lock(&pdev_list_mutex);
	359	list_add_tail(&pdev_entry->list, &pdev_list);
	360	mutex_unlock(&pdev_list_mutex);
	361
	362	return 0;
	363
	364	exit_device_free:
	365	kfree(pdev_entry);
	366	exit_device_put:
	367	platform_device_put(pdev);
	368	exit:
	369	return err;
	370	}
371
372	#ifdef CONFIG_HOTPLUG_CPU
d2bc7b13	373	static void coretemp_device_remove(unsigned int cpu)
bebe4678 RM	374	{
	375	struct pdev_entry p, n;
	376	mutex_lock(&pdev_list_mutex);
	377	list_for_each_entry_safe(p, n, &pdev_list, list) {
	378	if (p->cpu == cpu) {
	379	platform_device_unregister(p->pdev);
	380	list_del(&p->list);
	381	kfree(p);
	382	}
	383	}
	384	mutex_unlock(&pdev_list_mutex);
	385	}
	386
ba7c1927	387	static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
bebe4678 RM	388	unsigned long action, void *hcpu)
	389	{
	390	unsigned int cpu = (unsigned long) hcpu;
	391
	392	switch (action) {
	393	case CPU_ONLINE:
561d9a96	394	case CPU_DOWN_FAILED:
bebe4678 RM	395	coretemp_device_add(cpu);
bebe4678 RM	396	break;
561d9a96	397	case CPU_DOWN_PREPARE:
bebe4678 RM	398	coretemp_device_remove(cpu);
	399	break;
	400	}
	401	return NOTIFY_OK;
	402	}
	403
ba7c1927	404	static struct notifier_block coretemp_cpu_notifier __refdata = {
bebe4678 RM	405	.notifier_call = coretemp_cpu_callback,
	406	};
	407	#endif /* !CONFIG_HOTPLUG_CPU */
	408
	409	static int __init coretemp_init(void)
	410	{
	411	int i, err = -ENODEV;
	412	struct pdev_entry p, n;
	413
bebe4678	414	/* quick check if we run Intel */
92cb7612	415	if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
bebe4678 RM	416	goto exit;
	417
	418	err = platform_driver_register(&coretemp_driver);
	419	if (err)
	420	goto exit;
	421
	422	for_each_online_cpu(i) {
92cb7612	423	struct cpuinfo_x86 *c = &cpu_data(i);
bebe4678	424
708a62bc	425	/* check if family 6, models 0xe, 0xf, 0x16, 0x17, 0x1A, 0x1c */
bebe4678	426	if ((c->cpuid_level < 0) \|\| (c->x86 != 0x6) \|\|
c940336b	427	!((c->x86_model == 0xe) \|\| (c->x86_model == 0xf) \|\|
34c86c1e	428	(c->x86_model == 0x16) \|\| (c->x86_model == 0x17) \|\|
0bf41d9f	429	(c->x86_model == 0x1A) \|\| (c->x86_model == 0x1c))) {
bebe4678 RM	430
	431	/* supported CPU not found, but report the unknown
	432	family 6 CPU */
	433	if ((c->x86 == 0x6) && (c->x86_model > 0xf))
	434	printk(KERN_WARNING DRVNAME ": Unknown CPU "
	435	"model %x\n", c->x86_model);
	436	continue;
	437	}
	438
	439	err = coretemp_device_add(i);
	440	if (err)
	441	goto exit_devices_unreg;
	442	}
	443	if (list_empty(&pdev_list)) {
	444	err = -ENODEV;
	445	goto exit_driver_unreg;
	446	}
	447
	448	#ifdef CONFIG_HOTPLUG_CPU
	449	register_hotcpu_notifier(&coretemp_cpu_notifier);
	450	#endif
	451	return 0;
	452
	453	exit_devices_unreg:
	454	mutex_lock(&pdev_list_mutex);
	455	list_for_each_entry_safe(p, n, &pdev_list, list) {
	456	platform_device_unregister(p->pdev);
	457	list_del(&p->list);
	458	kfree(p);
	459	}
	460	mutex_unlock(&pdev_list_mutex);
	461	exit_driver_unreg:
	462	platform_driver_unregister(&coretemp_driver);
	463	exit:
	464	return err;
	465	}
	466
	467	static void __exit coretemp_exit(void)
	468	{
	469	struct pdev_entry p, n;
	470	#ifdef CONFIG_HOTPLUG_CPU
	471	unregister_hotcpu_notifier(&coretemp_cpu_notifier);
	472	#endif
	473	mutex_lock(&pdev_list_mutex);
	474	list_for_each_entry_safe(p, n, &pdev_list, list) {
	475	platform_device_unregister(p->pdev);
	476	list_del(&p->list);
	477	kfree(p);
	478	}
	479	mutex_unlock(&pdev_list_mutex);
	480	platform_driver_unregister(&coretemp_driver);
	481	}
	482
	483	MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
	484	MODULE_DESCRIPTION("Intel Core temperature monitor");
	485	MODULE_LICENSE("GPL");
	486
	487	module_init(coretemp_init)
	488	module_exit(coretemp_exit)