[GitHub/mt8127/android_kernel_alcatel_ttab.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>
#include <asm/cpu_device_id.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 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 = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	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:
		return -ENODEV;
	}

	/* 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");
		return err;
	}

	platform_set_drvdata(pdev, data);

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

	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);
	return err;
}

static int 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);
	return 0;
}

static struct platform_driver via_cputemp_driver = {
	.driver = {
		.owner = THIS_MODULE,
		.name = DRVNAME,
	},
	.probe = via_cputemp_probe,
	.remove = 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 const struct x86_cpu_id __initconst cputemp_ids[] = {
	{ X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
	{ X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
	{ X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
	{}
};
MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);

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

	if (!x86_match_cpu(cputemp_ids))
		return -ENODEV;

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

	get_online_cpus();
	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)) {
		put_online_cpus();
		err = -ENODEV;
		goto exit_driver_unreg;
	}
#endif

	register_hotcpu_notifier(&via_cputemp_cpu_notifier);
	put_online_cpus();
	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;

	get_online_cpus();
	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);
	put_online_cpus();
	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>
267fc978	40	#include <asm/cpu_device_id.h>
70c38772 HW	41
	42	#define DRVNAME "via_cputemp"
	43
f2799418	44	enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
70c38772 HW	45
	46	/*
	47	* Functions declaration
	48	*/
	49
	50	struct via_cputemp_data {
	51	struct device *hwmon_dev;
	52	const char *name;
764e043b	53	u8 vrm;
70c38772	54	u32 id;
764e043b JD	55	u32 msr_temp;
764e043b JD	56	u32 msr_vid;
70c38772 HW	57	};
	58
	59	/*
	60	* Sysfs stuff
	61	*/
	62
	63	static ssize_t show_name(struct device *dev, struct device_attribute
	64	devattr, char buf)
	65	{
	66	int ret;
	67	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	68	struct via_cputemp_data *data = dev_get_drvdata(dev);
	69
	70	if (attr->index == SHOW_NAME)
	71	ret = sprintf(buf, "%s\n", data->name);
	72	else /* show label */
	73	ret = sprintf(buf, "Core %d\n", data->id);
	74	return ret;
	75	}
	76
	77	static ssize_t show_temp(struct device *dev,
	78	struct device_attribute devattr, char buf)
	79	{
	80	struct via_cputemp_data *data = dev_get_drvdata(dev);
	81	u32 eax, edx;
	82	int err;
	83
764e043b	84	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
70c38772 HW	85	if (err)
	86	return -EAGAIN;
	87
	88	return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
	89	}
	90
764e043b JD	91	static ssize_t show_cpu_vid(struct device *dev,
	92	struct device_attribute devattr, char buf)
	93	{
	94	struct via_cputemp_data *data = dev_get_drvdata(dev);
	95	u32 eax, edx;
	96	int err;
	97
	98	err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
	99	if (err)
	100	return -EAGAIN;
	101
	102	return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
	103	}
	104
70c38772 HW	105	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
	106	SHOW_TEMP);
	107	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
	108	static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
	109
	110	static struct attribute *via_cputemp_attributes[] = {
	111	&sensor_dev_attr_name.dev_attr.attr,
	112	&sensor_dev_attr_temp1_label.dev_attr.attr,
	113	&sensor_dev_attr_temp1_input.dev_attr.attr,
	114	NULL
	115	};
	116
	117	static const struct attribute_group via_cputemp_group = {
	118	.attrs = via_cputemp_attributes,
	119	};
	120
764e043b JD	121	/* Optional attributes */
	122	static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
	123
6c931ae1	124	static int via_cputemp_probe(struct platform_device *pdev)
70c38772 HW	125	{
	126	struct via_cputemp_data *data;
	127	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
	128	int err;
	129	u32 eax, edx;
	130
505dc0cc GR	131	data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
	132	GFP_KERNEL);
	133	if (!data)
	134	return -ENOMEM;
70c38772 HW	135
	136	data->id = pdev->id;
	137	data->name = "via_cputemp";
	138
	139	switch (c->x86_model) {
	140	case 0xA:
	141	/* C7 A */
	142	case 0xD:
	143	/* C7 D */
764e043b JD	144	data->msr_temp = 0x1169;
764e043b JD	145	data->msr_vid = 0x198;
70c38772 HW	146	break;
	147	case 0xF:
	148	/* Nano */
764e043b	149	data->msr_temp = 0x1423;
70c38772 HW	150	break;
70c38772 HW	151	default:
505dc0cc	152	return -ENODEV;
70c38772 HW	153	}
	154
	155	/* test if we can access the TEMPERATURE MSR */
764e043b	156	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
70c38772 HW	157	if (err) {
	158	dev_err(&pdev->dev,
	159	"Unable to access TEMPERATURE MSR, giving up\n");
505dc0cc	160	return err;
70c38772 HW	161	}
	162
	163	platform_set_drvdata(pdev, data);
	164
	165	err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
	166	if (err)
505dc0cc	167	return err;
70c38772	168
764e043b JD	169	if (data->msr_vid)
	170	data->vrm = vid_which_vrm();
	171
	172	if (data->vrm) {
	173	err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
	174	if (err)
	175	goto exit_remove;
	176	}
	177
70c38772 HW	178	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	179	if (IS_ERR(data->hwmon_dev)) {
	180	err = PTR_ERR(data->hwmon_dev);
	181	dev_err(&pdev->dev, "Class registration failed (%d)\n",
	182	err);
	183	goto exit_remove;
	184	}
	185
	186	return 0;
	187
	188	exit_remove:
764e043b JD	189	if (data->vrm)
764e043b JD	190	device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
70c38772	191	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
70c38772 HW	192	return err;
	193	}
	194
281dfd0b	195	static int via_cputemp_remove(struct platform_device *pdev)
70c38772 HW	196	{
	197	struct via_cputemp_data *data = platform_get_drvdata(pdev);
	198
	199	hwmon_device_unregister(data->hwmon_dev);
764e043b JD	200	if (data->vrm)
764e043b JD	201	device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
70c38772	202	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
70c38772 HW	203	return 0;
	204	}
	205
	206	static struct platform_driver via_cputemp_driver = {
	207	.driver = {
	208	.owner = THIS_MODULE,
	209	.name = DRVNAME,
	210	},
	211	.probe = via_cputemp_probe,
9e5e9b7a	212	.remove = via_cputemp_remove,
70c38772 HW	213	};
	214
	215	struct pdev_entry {
	216	struct list_head list;
	217	struct platform_device *pdev;
	218	unsigned int cpu;
	219	};
	220
	221	static LIST_HEAD(pdev_list);
	222	static DEFINE_MUTEX(pdev_list_mutex);
	223
	224	static int __cpuinit via_cputemp_device_add(unsigned int cpu)
	225	{
	226	int err;
	227	struct platform_device *pdev;
	228	struct pdev_entry *pdev_entry;
	229
	230	pdev = platform_device_alloc(DRVNAME, cpu);
	231	if (!pdev) {
	232	err = -ENOMEM;
edb8d53c	233	pr_err("Device allocation failed\n");
70c38772 HW	234	goto exit;
	235	}
	236
	237	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
	238	if (!pdev_entry) {
	239	err = -ENOMEM;
	240	goto exit_device_put;
	241	}
	242
	243	err = platform_device_add(pdev);
	244	if (err) {
edb8d53c	245	pr_err("Device addition failed (%d)\n", err);
70c38772 HW	246	goto exit_device_free;
	247	}
	248
	249	pdev_entry->pdev = pdev;
	250	pdev_entry->cpu = cpu;
	251	mutex_lock(&pdev_list_mutex);
	252	list_add_tail(&pdev_entry->list, &pdev_list);
	253	mutex_unlock(&pdev_list_mutex);
	254
	255	return 0;
	256
	257	exit_device_free:
	258	kfree(pdev_entry);
	259	exit_device_put:
	260	platform_device_put(pdev);
	261	exit:
	262	return err;
	263	}
	264
a5f42a6b	265	static void __cpuinit via_cputemp_device_remove(unsigned int cpu)
70c38772	266	{
ae9e0ce7 JB	267	struct pdev_entry *p;
ae9e0ce7 JB	268
70c38772	269	mutex_lock(&pdev_list_mutex);
ae9e0ce7	270	list_for_each_entry(p, &pdev_list, list) {
70c38772 HW	271	if (p->cpu == cpu) {
	272	platform_device_unregister(p->pdev);
	273	list_del(&p->list);
ae9e0ce7	274	mutex_unlock(&pdev_list_mutex);
70c38772	275	kfree(p);
ae9e0ce7	276	return;
70c38772 HW	277	}
	278	}
	279	mutex_unlock(&pdev_list_mutex);
	280	}
	281
	282	static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb,
	283	unsigned long action, void *hcpu)
	284	{
	285	unsigned int cpu = (unsigned long) hcpu;
	286
	287	switch (action) {
	288	case CPU_ONLINE:
	289	case CPU_DOWN_FAILED:
	290	via_cputemp_device_add(cpu);
	291	break;
	292	case CPU_DOWN_PREPARE:
	293	via_cputemp_device_remove(cpu);
	294	break;
	295	}
	296	return NOTIFY_OK;
	297	}
	298
	299	static struct notifier_block via_cputemp_cpu_notifier __refdata = {
	300	.notifier_call = via_cputemp_cpu_callback,
	301	};
70c38772	302
e273bd98	303	static const struct x86_cpu_id __initconst cputemp_ids[] = {
267fc978 AK	304	{ X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
	305	{ X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
	306	{ X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
	307	{}
	308	};
	309	MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
	310
70c38772 HW	311	static int __init via_cputemp_init(void)
	312	{
	313	int i, err;
70c38772	314
267fc978 AK	315	if (!x86_match_cpu(cputemp_ids))
267fc978 AK	316	return -ENODEV;
70c38772 HW	317
	318	err = platform_driver_register(&via_cputemp_driver);
	319	if (err)
	320	goto exit;
	321
1ec3ddfd	322	get_online_cpus();
70c38772 HW	323	for_each_online_cpu(i) {
	324	struct cpuinfo_x86 *c = &cpu_data(i);
	325
	326	if (c->x86 != 6)
	327	continue;
	328
	329	if (c->x86_model < 0x0a)
	330	continue;
	331
	332	if (c->x86_model > 0x0f) {
edb8d53c	333	pr_warn("Unknown CPU model 0x%x\n", c->x86_model);
70c38772 HW	334	continue;
	335	}
	336
ae9e0ce7	337	via_cputemp_device_add(i);
70c38772	338	}
ae9e0ce7 JB	339
ae9e0ce7 JB	340	#ifndef CONFIG_HOTPLUG_CPU
70c38772	341	if (list_empty(&pdev_list)) {
1ec3ddfd	342	put_online_cpus();
70c38772 HW	343	err = -ENODEV;
	344	goto exit_driver_unreg;
	345	}
ae9e0ce7	346	#endif
70c38772	347
70c38772	348	register_hotcpu_notifier(&via_cputemp_cpu_notifier);
1ec3ddfd	349	put_online_cpus();
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
1ec3ddfd	364	get_online_cpus();
70c38772	365	unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
70c38772 HW	366	mutex_lock(&pdev_list_mutex);
	367	list_for_each_entry_safe(p, n, &pdev_list, list) {
	368	platform_device_unregister(p->pdev);
	369	list_del(&p->list);
	370	kfree(p);
	371	}
	372	mutex_unlock(&pdev_list_mutex);
1ec3ddfd	373	put_online_cpus();
70c38772 HW	374	platform_driver_unregister(&via_cputemp_driver);
	375	}
	376
	377	MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
	378	MODULE_DESCRIPTION("VIA CPU temperature monitor");
	379	MODULE_LICENSE("GPL");
	380
	381	module_init(via_cputemp_init)
	382	module_exit(via_cputemp_exit)