[deliverable/linux.git] / drivers / hwmon / via-cputemp.c

/*
 * via-cputemp.c - Driver for VIA CPU core temperature monitoring
 * Copyright (C) 2009 VIA Technologies, Inc.
 *
 * based on existing coretemp.c, which is
 *
 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.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	"via_cputemp"

enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };

/*
 * Functions declaration
 */

struct via_cputemp_data {
	struct device *hwmon_dev;
	const char *name;
	u8 vrm;
	u32 id;
	u32 msr_temp;
	u32 msr_vid;
};

/*
 * 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 via_cputemp_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_temp(struct device *dev,
			 struct device_attribute *devattr, char *buf)
{
	struct via_cputemp_data *data = dev_get_drvdata(dev);
	u32 eax, edx;
	int err;

	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
	if (err)
		return -EAGAIN;

	return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
}

static ssize_t show_cpu_vid(struct device *dev,
			    struct device_attribute *devattr, char *buf)
{
	struct via_cputemp_data *data = dev_get_drvdata(dev);
	u32 eax, edx;
	int err;

	err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
	if (err)
		return -EAGAIN;

	return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
			  SHOW_TEMP);
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 *via_cputemp_attributes[] = {
	&sensor_dev_attr_name.dev_attr.attr,
	&sensor_dev_attr_temp1_label.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	NULL
};

static const struct attribute_group via_cputemp_group = {
	.attrs = via_cputemp_attributes,
};

/* Optional attributes */
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);

static int __devinit via_cputemp_probe(struct platform_device *pdev)
{
	struct via_cputemp_data *data;
	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
	int err;
	u32 eax, edx;

	data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		dev_err(&pdev->dev, "Out of memory\n");
		goto exit;
	}

	data->id = pdev->id;
	data->name = "via_cputemp";

	switch (c->x86_model) {
	case 0xA:
		/* C7 A */
	case 0xD:
		/* C7 D */
		data->msr_temp = 0x1169;
		data->msr_vid = 0x198;
		break;
	case 0xF:
		/* Nano */
		data->msr_temp = 0x1423;
		break;
	default:
		err = -ENODEV;
		goto exit_free;
	}

	/* test if we can access the TEMPERATURE MSR */
	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
	if (err) {
		dev_err(&pdev->dev,
			"Unable to access TEMPERATURE MSR, giving up\n");
		goto exit_free;
	}

	platform_set_drvdata(pdev, data);

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

	if (data->msr_vid)
		data->vrm = vid_which_vrm();

	if (data->vrm) {
		err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
		if (err)
			goto exit_remove;
	}

	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_remove;
	}

	return 0;

exit_remove:
	if (data->vrm)
		device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
exit_free:
	platform_set_drvdata(pdev, NULL);
	kfree(data);
exit:
	return err;
}

static int __devexit via_cputemp_remove(struct platform_device *pdev)
{
	struct via_cputemp_data *data = platform_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	if (data->vrm)
		device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
	platform_set_drvdata(pdev, NULL);
	kfree(data);
	return 0;
}

static struct platform_driver via_cputemp_driver = {
	.driver = {
		.owner = THIS_MODULE,
		.name = DRVNAME,
	},
	.probe = via_cputemp_probe,
	.remove = __devexit_p(via_cputemp_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 via_cputemp_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;
		pr_err("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) {
		pr_err("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;
}

static void __cpuinit via_cputemp_device_remove(unsigned int cpu)
{
	struct pdev_entry *p;

	mutex_lock(&pdev_list_mutex);
	list_for_each_entry(p, &pdev_list, list) {
		if (p->cpu == cpu) {
			platform_device_unregister(p->pdev);
			list_del(&p->list);
			mutex_unlock(&pdev_list_mutex);
			kfree(p);
			return;
		}
	}
	mutex_unlock(&pdev_list_mutex);
}

static int __cpuinit via_cputemp_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:
		via_cputemp_device_add(cpu);
		break;
	case CPU_DOWN_PREPARE:
		via_cputemp_device_remove(cpu);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block via_cputemp_cpu_notifier __refdata = {
	.notifier_call = via_cputemp_cpu_callback,
};

static int __init via_cputemp_init(void)
{
	int i, err;

	if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) {
		printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n");
		err = -ENODEV;
		goto exit;
	}

	err = platform_driver_register(&via_cputemp_driver);
	if (err)
		goto exit;

	for_each_online_cpu(i) {
		struct cpuinfo_x86 *c = &cpu_data(i);

		if (c->x86 != 6)
			continue;

		if (c->x86_model < 0x0a)
			continue;

		if (c->x86_model > 0x0f) {
			pr_warn("Unknown CPU model 0x%x\n", c->x86_model);
			continue;
		}

		via_cputemp_device_add(i);
	}

#ifndef CONFIG_HOTPLUG_CPU
	if (list_empty(&pdev_list)) {
		err = -ENODEV;
		goto exit_driver_unreg;
	}
#endif

	register_hotcpu_notifier(&via_cputemp_cpu_notifier);
	return 0;

#ifndef CONFIG_HOTPLUG_CPU
exit_driver_unreg:
	platform_driver_unregister(&via_cputemp_driver);
#endif
exit:
	return err;
}

static void __exit via_cputemp_exit(void)
{
	struct pdev_entry *p, *n;

	unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
	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(&via_cputemp_driver);
}

MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
MODULE_DESCRIPTION("VIA CPU temperature monitor");
MODULE_LICENSE("GPL");

module_init(via_cputemp_init)
module_exit(via_cputemp_exit)
Commit	Line	Data
70c38772 HW	1	/*
	2	* via-cputemp.c - Driver for VIA CPU core temperature monitoring
	3	* Copyright (C) 2009 VIA Technologies, Inc.
	4	*
	5	* based on existing coretemp.c, which is
	6	*
	7	* Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; version 2 of the License.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	21	* 02110-1301 USA.
	22	*/
	23
edb8d53c JP	24	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
edb8d53c JP	25
70c38772	26	#include <linux/module.h>
70c38772 HW	27	#include <linux/init.h>
70c38772 HW	28	#include <linux/slab.h>
70c38772	29	#include <linux/hwmon.h>
764e043b	30	#include <linux/hwmon-vid.h>
70c38772 HW	31	#include <linux/sysfs.h>
	32	#include <linux/hwmon-sysfs.h>
	33	#include <linux/err.h>
	34	#include <linux/mutex.h>
	35	#include <linux/list.h>
	36	#include <linux/platform_device.h>
	37	#include <linux/cpu.h>
	38	#include <asm/msr.h>
	39	#include <asm/processor.h>
	40
	41	#define DRVNAME "via_cputemp"
	42
f2799418	43	enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
70c38772 HW	44
	45	/*
	46	* Functions declaration
	47	*/
	48
	49	struct via_cputemp_data {
	50	struct device *hwmon_dev;
	51	const char *name;
764e043b	52	u8 vrm;
70c38772	53	u32 id;
764e043b JD	54	u32 msr_temp;
764e043b JD	55	u32 msr_vid;
70c38772 HW	56	};
	57
	58	/*
	59	* Sysfs stuff
	60	*/
	61
	62	static ssize_t show_name(struct device *dev, struct device_attribute
	63	devattr, char buf)
	64	{
	65	int ret;
	66	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	67	struct via_cputemp_data *data = dev_get_drvdata(dev);
	68
	69	if (attr->index == SHOW_NAME)
	70	ret = sprintf(buf, "%s\n", data->name);
	71	else /* show label */
	72	ret = sprintf(buf, "Core %d\n", data->id);
	73	return ret;
	74	}
	75
	76	static ssize_t show_temp(struct device *dev,
	77	struct device_attribute devattr, char buf)
	78	{
	79	struct via_cputemp_data *data = dev_get_drvdata(dev);
	80	u32 eax, edx;
	81	int err;
	82
764e043b	83	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
70c38772 HW	84	if (err)
	85	return -EAGAIN;
	86
	87	return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
	88	}
	89
764e043b JD	90	static ssize_t show_cpu_vid(struct device *dev,
	91	struct device_attribute devattr, char buf)
	92	{
	93	struct via_cputemp_data *data = dev_get_drvdata(dev);
	94	u32 eax, edx;
	95	int err;
	96
	97	err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
	98	if (err)
	99	return -EAGAIN;
	100
	101	return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
	102	}
	103
70c38772 HW	104	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
	105	SHOW_TEMP);
	106	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
	107	static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
	108
	109	static struct attribute *via_cputemp_attributes[] = {
	110	&sensor_dev_attr_name.dev_attr.attr,
	111	&sensor_dev_attr_temp1_label.dev_attr.attr,
	112	&sensor_dev_attr_temp1_input.dev_attr.attr,
	113	NULL
	114	};
	115
	116	static const struct attribute_group via_cputemp_group = {
	117	.attrs = via_cputemp_attributes,
	118	};
	119
764e043b JD	120	/* Optional attributes */
	121	static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
	122
70c38772 HW	123	static int __devinit via_cputemp_probe(struct platform_device *pdev)
	124	{
	125	struct via_cputemp_data *data;
	126	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
	127	int err;
	128	u32 eax, edx;
	129
	130	data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL);
	131	if (!data) {
	132	err = -ENOMEM;
	133	dev_err(&pdev->dev, "Out of memory\n");
	134	goto exit;
	135	}
	136
	137	data->id = pdev->id;
	138	data->name = "via_cputemp";
	139
	140	switch (c->x86_model) {
	141	case 0xA:
	142	/* C7 A */
	143	case 0xD:
	144	/* C7 D */
764e043b JD	145	data->msr_temp = 0x1169;
764e043b JD	146	data->msr_vid = 0x198;
70c38772 HW	147	break;
	148	case 0xF:
	149	/* Nano */
764e043b	150	data->msr_temp = 0x1423;
70c38772 HW	151	break;
	152	default:
	153	err = -ENODEV;
	154	goto exit_free;
	155	}
	156
	157	/* test if we can access the TEMPERATURE MSR */
764e043b	158	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
70c38772 HW	159	if (err) {
	160	dev_err(&pdev->dev,
	161	"Unable to access TEMPERATURE MSR, giving up\n");
	162	goto exit_free;
	163	}
	164
	165	platform_set_drvdata(pdev, data);
	166
	167	err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
	168	if (err)
	169	goto exit_free;
	170
764e043b JD	171	if (data->msr_vid)
	172	data->vrm = vid_which_vrm();
	173
	174	if (data->vrm) {
	175	err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
	176	if (err)
	177	goto exit_remove;
	178	}
	179
70c38772 HW	180	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	181	if (IS_ERR(data->hwmon_dev)) {
	182	err = PTR_ERR(data->hwmon_dev);
	183	dev_err(&pdev->dev, "Class registration failed (%d)\n",
	184	err);
	185	goto exit_remove;
	186	}
	187
	188	return 0;
	189
	190	exit_remove:
764e043b JD	191	if (data->vrm)
764e043b JD	192	device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
70c38772 HW	193	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
	194	exit_free:
	195	platform_set_drvdata(pdev, NULL);
	196	kfree(data);
	197	exit:
	198	return err;
	199	}
	200
	201	static int __devexit via_cputemp_remove(struct platform_device *pdev)
	202	{
	203	struct via_cputemp_data *data = platform_get_drvdata(pdev);
	204
	205	hwmon_device_unregister(data->hwmon_dev);
764e043b JD	206	if (data->vrm)
764e043b JD	207	device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
70c38772 HW	208	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
	209	platform_set_drvdata(pdev, NULL);
	210	kfree(data);
	211	return 0;
	212	}
	213
	214	static struct platform_driver via_cputemp_driver = {
	215	.driver = {
	216	.owner = THIS_MODULE,
	217	.name = DRVNAME,
	218	},
	219	.probe = via_cputemp_probe,
	220	.remove = __devexit_p(via_cputemp_remove),
	221	};
	222
	223	struct pdev_entry {
	224	struct list_head list;
	225	struct platform_device *pdev;
	226	unsigned int cpu;
	227	};
	228
	229	static LIST_HEAD(pdev_list);
	230	static DEFINE_MUTEX(pdev_list_mutex);
	231
	232	static int __cpuinit via_cputemp_device_add(unsigned int cpu)
	233	{
	234	int err;
	235	struct platform_device *pdev;
	236	struct pdev_entry *pdev_entry;
	237
	238	pdev = platform_device_alloc(DRVNAME, cpu);
	239	if (!pdev) {
	240	err = -ENOMEM;
edb8d53c	241	pr_err("Device allocation failed\n");
70c38772 HW	242	goto exit;
	243	}
	244
	245	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
	246	if (!pdev_entry) {
	247	err = -ENOMEM;
	248	goto exit_device_put;
	249	}
	250
	251	err = platform_device_add(pdev);
	252	if (err) {
edb8d53c	253	pr_err("Device addition failed (%d)\n", err);
70c38772 HW	254	goto exit_device_free;
	255	}
	256
	257	pdev_entry->pdev = pdev;
	258	pdev_entry->cpu = cpu;
	259	mutex_lock(&pdev_list_mutex);
	260	list_add_tail(&pdev_entry->list, &pdev_list);
	261	mutex_unlock(&pdev_list_mutex);
	262
	263	return 0;
	264
	265	exit_device_free:
	266	kfree(pdev_entry);
	267	exit_device_put:
	268	platform_device_put(pdev);
	269	exit:
	270	return err;
	271	}
	272
a5f42a6b	273	static void __cpuinit via_cputemp_device_remove(unsigned int cpu)
70c38772	274	{
ae9e0ce7 JB	275	struct pdev_entry *p;
ae9e0ce7 JB	276
70c38772	277	mutex_lock(&pdev_list_mutex);
ae9e0ce7	278	list_for_each_entry(p, &pdev_list, list) {
70c38772 HW	279	if (p->cpu == cpu) {
	280	platform_device_unregister(p->pdev);
	281	list_del(&p->list);
ae9e0ce7	282	mutex_unlock(&pdev_list_mutex);
70c38772	283	kfree(p);
ae9e0ce7	284	return;
70c38772 HW	285	}
	286	}
	287	mutex_unlock(&pdev_list_mutex);
	288	}
	289
	290	static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb,
	291	unsigned long action, void *hcpu)
	292	{
	293	unsigned int cpu = (unsigned long) hcpu;
	294
	295	switch (action) {
	296	case CPU_ONLINE:
	297	case CPU_DOWN_FAILED:
	298	via_cputemp_device_add(cpu);
	299	break;
	300	case CPU_DOWN_PREPARE:
	301	via_cputemp_device_remove(cpu);
	302	break;
	303	}
	304	return NOTIFY_OK;
	305	}
	306
	307	static struct notifier_block via_cputemp_cpu_notifier __refdata = {
	308	.notifier_call = via_cputemp_cpu_callback,
	309	};
70c38772 HW	310
	311	static int __init via_cputemp_init(void)
	312	{
	313	int i, err;
70c38772 HW	314
	315	if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) {
	316	printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n");
	317	err = -ENODEV;
	318	goto exit;
	319	}
	320
	321	err = platform_driver_register(&via_cputemp_driver);
	322	if (err)
	323	goto exit;
	324
	325	for_each_online_cpu(i) {
	326	struct cpuinfo_x86 *c = &cpu_data(i);
	327
	328	if (c->x86 != 6)
	329	continue;
	330
	331	if (c->x86_model < 0x0a)
	332	continue;
	333
	334	if (c->x86_model > 0x0f) {
edb8d53c	335	pr_warn("Unknown CPU model 0x%x\n", c->x86_model);
70c38772 HW	336	continue;
	337	}
	338
ae9e0ce7	339	via_cputemp_device_add(i);
70c38772	340	}
ae9e0ce7 JB	341
ae9e0ce7 JB	342	#ifndef CONFIG_HOTPLUG_CPU
70c38772 HW	343	if (list_empty(&pdev_list)) {
	344	err = -ENODEV;
	345	goto exit_driver_unreg;
	346	}
ae9e0ce7	347	#endif
70c38772	348
70c38772	349	register_hotcpu_notifier(&via_cputemp_cpu_notifier);
70c38772 HW	350	return 0;
70c38772 HW	351
ae9e0ce7	352	#ifndef CONFIG_HOTPLUG_CPU
70c38772 HW	353	exit_driver_unreg:
70c38772 HW	354	platform_driver_unregister(&via_cputemp_driver);
ae9e0ce7	355	#endif
70c38772 HW	356	exit:
	357	return err;
	358	}
	359
	360	static void __exit via_cputemp_exit(void)
	361	{
	362	struct pdev_entry p, n;
17c10d61	363
70c38772	364	unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
70c38772 HW	365	mutex_lock(&pdev_list_mutex);
	366	list_for_each_entry_safe(p, n, &pdev_list, list) {
	367	platform_device_unregister(p->pdev);
	368	list_del(&p->list);
	369	kfree(p);
	370	}
	371	mutex_unlock(&pdev_list_mutex);
	372	platform_driver_unregister(&via_cputemp_driver);
	373	}
	374
	375	MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
	376	MODULE_DESCRIPTION("VIA CPU temperature monitor");
	377	MODULE_LICENSE("GPL");
	378
	379	module_init(via_cputemp_init)
	380	module_exit(via_cputemp_exit)