drivers/hwmon/via-cputemp.c - linux/kernel/git/viro/vfs - Git at Google

 /*
  * 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 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 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 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)
	/*
	* 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 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 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 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)