[linux-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 ismobile = 1;
	int err;
	u32 eax, edx;

	/* Early chips have no MSR for TjMax */

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

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

		/* 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");
			ismobile = 0;
		} else if (!(eax & 0x10000000)) {
			ismobile = 0;
		}
	}

	if (ismobile) {

		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;
		}
	} else {
		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 */

	if (c->x86_model > 0xe) {
		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 */
		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))) {

			/* 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;
	160	int ismobile = 1;
	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)) {
	167	ismobile = 0;
	168	}
	169
	170	if ((c->x86_model > 0xe) && (ismobile)) {
	171
	172	/* Now we can detect the mobile CPU using Intel provided table
	173	http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
	174	For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
	175	*/
	176
	177	err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
	178	if (err) {
	179	dev_warn(dev,
	180	"Unable to access MSR 0x17, assuming desktop"
	181	" CPU\n");
	182	ismobile = 0;
	183	} else if (!(eax & 0x10000000)) {
	184	ismobile = 0;
	185	}
	186	}
	187
	188	if (ismobile) {
	189
	190	err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
	191	if (err) {
	192	dev_warn(dev,
	193	"Unable to access MSR 0xEE, for Tjmax, left"
	194	" at default");
	195	} else if (eax & 0x40000000) {
	196	tjmax = 85000;
	197	}
	198	} else {
	199	dev_warn(dev, "Using relative temperature scale!\n");
	200	}
	201
	202	return tjmax;
	203	}
	204
bebe4678 RM	205	static int __devinit coretemp_probe(struct platform_device *pdev)
	206	{
	207	struct coretemp_data *data;
92cb7612	208	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
bebe4678 RM	209	int err;
	210	u32 eax, edx;
	211
	212	if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) {
	213	err = -ENOMEM;
	214	dev_err(&pdev->dev, "Out of memory\n");
	215	goto exit;
	216	}
	217
	218	data->id = pdev->id;
	219	data->name = "coretemp";
	220	mutex_init(&data->update_lock);
bebe4678 RM	221
	222	/* test if we can access the THERM_STATUS MSR */
	223	err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
	224	if (err) {
	225	dev_err(&pdev->dev,
	226	"Unable to access THERM_STATUS MSR, giving up\n");
	227	goto exit_free;
	228	}
	229
67f363b1 RM	230	/* Check if we have problem with errata AE18 of Core processors:
	231	Readings might stop update when processor visited too deep sleep,
	232	fixed for stepping D0 (6EC).
	233	*/
	234
	235	if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) {
	236	/* check for microcode update */
	237	rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx);
	238	if (edx < 0x39) {
6d79af70	239	err = -ENODEV;
67f363b1 RM	240	dev_err(&pdev->dev,
	241	"Errata AE18 not fixed, update BIOS or "
	242	"microcode of the CPU!\n");
	243	goto exit_free;
	244	}
	245	}
	246
118a8871	247	data->tjmax = adjust_tjmax(c, data->id, &pdev->dev);
bebe4678 RM	248	platform_set_drvdata(pdev, data);
bebe4678 RM	249
6369a288 RM	250	/* read the still undocumented IA32_TEMPERATURE_TARGET it exists
	251	on older CPUs but not in this register */
	252
	253	if (c->x86_model > 0xe) {
	254	err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx);
	255	if (err) {
	256	dev_warn(&pdev->dev, "Unable to read"
	257	" IA32_TEMPERATURE_TARGET MSR\n");
	258	} else {
	259	data->ttarget = data->tjmax -
	260	(((eax >> 8) & 0xff) * 1000);
	261	err = device_create_file(&pdev->dev,
	262	&sensor_dev_attr_temp1_max.dev_attr);
	263	if (err)
	264	goto exit_free;
	265	}
	266	}
	267
bebe4678	268	if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
6369a288	269	goto exit_dev;
bebe4678	270
1beeffe4 TJ	271	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	272	if (IS_ERR(data->hwmon_dev)) {
	273	err = PTR_ERR(data->hwmon_dev);
bebe4678 RM	274	dev_err(&pdev->dev, "Class registration failed (%d)\n",
	275	err);
	276	goto exit_class;
	277	}
	278
	279	return 0;
	280
	281	exit_class:
	282	sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
6369a288 RM	283	exit_dev:
6369a288 RM	284	device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
bebe4678 RM	285	exit_free:
	286	kfree(data);
	287	exit:
	288	return err;
	289	}
	290
	291	static int __devexit coretemp_remove(struct platform_device *pdev)
	292	{
	293	struct coretemp_data *data = platform_get_drvdata(pdev);
	294
1beeffe4	295	hwmon_device_unregister(data->hwmon_dev);
bebe4678	296	sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
6369a288	297	device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
bebe4678 RM	298	platform_set_drvdata(pdev, NULL);
	299	kfree(data);
	300	return 0;
	301	}
	302
	303	static struct platform_driver coretemp_driver = {
	304	.driver = {
	305	.owner = THIS_MODULE,
	306	.name = DRVNAME,
	307	},
	308	.probe = coretemp_probe,
	309	.remove = __devexit_p(coretemp_remove),
	310	};
	311
	312	struct pdev_entry {
	313	struct list_head list;
	314	struct platform_device *pdev;
	315	unsigned int cpu;
	316	};
	317
	318	static LIST_HEAD(pdev_list);
	319	static DEFINE_MUTEX(pdev_list_mutex);
	320
	321	static int __cpuinit coretemp_device_add(unsigned int cpu)
	322	{
	323	int err;
	324	struct platform_device *pdev;
	325	struct pdev_entry *pdev_entry;
	326
	327	pdev = platform_device_alloc(DRVNAME, cpu);
	328	if (!pdev) {
	329	err = -ENOMEM;
	330	printk(KERN_ERR DRVNAME ": Device allocation failed\n");
	331	goto exit;
	332	}
	333
	334	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
	335	if (!pdev_entry) {
	336	err = -ENOMEM;
	337	goto exit_device_put;
	338	}
	339
	340	err = platform_device_add(pdev);
	341	if (err) {
	342	printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
	343	err);
	344	goto exit_device_free;
	345	}
	346
	347	pdev_entry->pdev = pdev;
	348	pdev_entry->cpu = cpu;
	349	mutex_lock(&pdev_list_mutex);
	350	list_add_tail(&pdev_entry->list, &pdev_list);
	351	mutex_unlock(&pdev_list_mutex);
	352
	353	return 0;
	354
	355	exit_device_free:
	356	kfree(pdev_entry);
	357	exit_device_put:
	358	platform_device_put(pdev);
	359	exit:
	360	return err;
	361	}
362
363	#ifdef CONFIG_HOTPLUG_CPU
d2bc7b13	364	static void coretemp_device_remove(unsigned int cpu)
bebe4678 RM	365	{
	366	struct pdev_entry p, n;
	367	mutex_lock(&pdev_list_mutex);
	368	list_for_each_entry_safe(p, n, &pdev_list, list) {
	369	if (p->cpu == cpu) {
	370	platform_device_unregister(p->pdev);
	371	list_del(&p->list);
	372	kfree(p);
	373	}
	374	}
	375	mutex_unlock(&pdev_list_mutex);
	376	}
	377
ba7c1927	378	static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
bebe4678 RM	379	unsigned long action, void *hcpu)
	380	{
	381	unsigned int cpu = (unsigned long) hcpu;
	382
	383	switch (action) {
	384	case CPU_ONLINE:
561d9a96	385	case CPU_DOWN_FAILED:
bebe4678 RM	386	coretemp_device_add(cpu);
bebe4678 RM	387	break;
561d9a96	388	case CPU_DOWN_PREPARE:
bebe4678 RM	389	coretemp_device_remove(cpu);
	390	break;
	391	}
	392	return NOTIFY_OK;
	393	}
	394
ba7c1927	395	static struct notifier_block coretemp_cpu_notifier __refdata = {
bebe4678 RM	396	.notifier_call = coretemp_cpu_callback,
	397	};
	398	#endif /* !CONFIG_HOTPLUG_CPU */
	399
	400	static int __init coretemp_init(void)
	401	{
	402	int i, err = -ENODEV;
	403	struct pdev_entry p, n;
	404
bebe4678	405	/* quick check if we run Intel */
92cb7612	406	if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
bebe4678 RM	407	goto exit;
	408
	409	err = platform_driver_register(&coretemp_driver);
	410	if (err)
	411	goto exit;
	412
	413	for_each_online_cpu(i) {
92cb7612	414	struct cpuinfo_x86 *c = &cpu_data(i);
bebe4678	415
34c86c1e	416	/* check if family 6, models 0xe, 0xf, 0x16, 0x17, 0x1A */
bebe4678	417	if ((c->cpuid_level < 0) \|\| (c->x86 != 0x6) \|\|
c940336b	418	!((c->x86_model == 0xe) \|\| (c->x86_model == 0xf) \|\|
34c86c1e DW	419	(c->x86_model == 0x16) \|\| (c->x86_model == 0x17) \|\|
34c86c1e DW	420	(c->x86_model == 0x1A))) {
bebe4678 RM	421
	422	/* supported CPU not found, but report the unknown
	423	family 6 CPU */
	424	if ((c->x86 == 0x6) && (c->x86_model > 0xf))
	425	printk(KERN_WARNING DRVNAME ": Unknown CPU "
	426	"model %x\n", c->x86_model);
	427	continue;
	428	}
	429
	430	err = coretemp_device_add(i);
	431	if (err)
	432	goto exit_devices_unreg;
	433	}
	434	if (list_empty(&pdev_list)) {
	435	err = -ENODEV;
	436	goto exit_driver_unreg;
	437	}
	438
	439	#ifdef CONFIG_HOTPLUG_CPU
	440	register_hotcpu_notifier(&coretemp_cpu_notifier);
	441	#endif
	442	return 0;
	443
	444	exit_devices_unreg:
	445	mutex_lock(&pdev_list_mutex);
	446	list_for_each_entry_safe(p, n, &pdev_list, list) {
	447	platform_device_unregister(p->pdev);
	448	list_del(&p->list);
	449	kfree(p);
	450	}
	451	mutex_unlock(&pdev_list_mutex);
	452	exit_driver_unreg:
	453	platform_driver_unregister(&coretemp_driver);
	454	exit:
	455	return err;
	456	}
	457
	458	static void __exit coretemp_exit(void)
	459	{
	460	struct pdev_entry p, n;
	461	#ifdef CONFIG_HOTPLUG_CPU
	462	unregister_hotcpu_notifier(&coretemp_cpu_notifier);
	463	#endif
	464	mutex_lock(&pdev_list_mutex);
	465	list_for_each_entry_safe(p, n, &pdev_list, list) {
	466	platform_device_unregister(p->pdev);
	467	list_del(&p->list);
	468	kfree(p);
	469	}
	470	mutex_unlock(&pdev_list_mutex);
	471	platform_driver_unregister(&coretemp_driver);
	472	}
	473
	474	MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
	475	MODULE_DESCRIPTION("Intel Core temperature monitor");
	476	MODULE_LICENSE("GPL");
	477
	478	module_init(coretemp_init)
	479	module_exit(coretemp_exit)