[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.
 */

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

enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };

/*
 * Functions declaration
 */

struct via_cputemp_data {
	struct device *hwmon_dev;
	const char *name;
	u32 id;
	u32 msr;
};

/*
 * 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, &eax, &edx);
	if (err)
		return -EAGAIN;

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

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,
};

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 = 0x1169;
		break;
	case 0xF:
		/* Nano */
		data->msr = 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, &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;

	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:
	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);
	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;
		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 __cpuinit via_cputemp_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 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,
};
#endif				/* !CONFIG_HOTPLUG_CPU */

static int __init via_cputemp_init(void)
{
	int i, err;
	struct pdev_entry *p, *n;

	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) {
			printk(KERN_WARNING DRVNAME ": Unknown CPU "
				"model 0x%x\n", c->x86_model);
			continue;
		}

		err = via_cputemp_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(&via_cputemp_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(&via_cputemp_driver);
exit:
	return err;
}

static void __exit via_cputemp_exit(void)
{
	struct pdev_entry *p, *n;
#ifdef CONFIG_HOTPLUG_CPU
	unregister_hotcpu_notifier(&via_cputemp_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(&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
	24	#include <linux/module.h>
70c38772 HW	25	#include <linux/init.h>
70c38772 HW	26	#include <linux/slab.h>
70c38772 HW	27	#include <linux/hwmon.h>
	28	#include <linux/sysfs.h>
	29	#include <linux/hwmon-sysfs.h>
	30	#include <linux/err.h>
	31	#include <linux/mutex.h>
	32	#include <linux/list.h>
	33	#include <linux/platform_device.h>
	34	#include <linux/cpu.h>
	35	#include <asm/msr.h>
	36	#include <asm/processor.h>
	37
	38	#define DRVNAME "via_cputemp"
	39
f2799418	40	enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
70c38772 HW	41
	42	/*
	43	* Functions declaration
	44	*/
	45
	46	struct via_cputemp_data {
	47	struct device *hwmon_dev;
	48	const char *name;
	49	u32 id;
	50	u32 msr;
	51	};
	52
	53	/*
	54	* Sysfs stuff
	55	*/
	56
	57	static ssize_t show_name(struct device *dev, struct device_attribute
	58	devattr, char buf)
	59	{
	60	int ret;
	61	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	62	struct via_cputemp_data *data = dev_get_drvdata(dev);
	63
	64	if (attr->index == SHOW_NAME)
	65	ret = sprintf(buf, "%s\n", data->name);
	66	else /* show label */
	67	ret = sprintf(buf, "Core %d\n", data->id);
	68	return ret;
	69	}
	70
	71	static ssize_t show_temp(struct device *dev,
	72	struct device_attribute devattr, char buf)
	73	{
	74	struct via_cputemp_data *data = dev_get_drvdata(dev);
	75	u32 eax, edx;
	76	int err;
	77
	78	err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx);
	79	if (err)
	80	return -EAGAIN;
	81
	82	return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
	83	}
	84
	85	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
	86	SHOW_TEMP);
	87	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
	88	static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
	89
	90	static struct attribute *via_cputemp_attributes[] = {
	91	&sensor_dev_attr_name.dev_attr.attr,
	92	&sensor_dev_attr_temp1_label.dev_attr.attr,
	93	&sensor_dev_attr_temp1_input.dev_attr.attr,
	94	NULL
	95	};
	96
	97	static const struct attribute_group via_cputemp_group = {
	98	.attrs = via_cputemp_attributes,
	99	};
	100
	101	static int __devinit via_cputemp_probe(struct platform_device *pdev)
	102	{
	103	struct via_cputemp_data *data;
	104	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
105	int err;
106	u32 eax, edx;
107
108	data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL);
109	if (!data) {
110	err = -ENOMEM;
111	dev_err(&pdev->dev, "Out of memory\n");
112	goto exit;
113	}
114
115	data->id = pdev->id;
116	data->name = "via_cputemp";
117
118	switch (c->x86_model) {
119	case 0xA:
120	/* C7 A */
121	case 0xD:
122	/* C7 D */
123	data->msr = 0x1169;
124	break;
125	case 0xF:
126	/* Nano */
127	data->msr = 0x1423;
128	break;
129	default:
130	err = -ENODEV;
131	goto exit_free;
132	}
133
134	/* test if we can access the TEMPERATURE MSR */
135	err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx);
136	if (err) {
137	dev_err(&pdev->dev,
138	"Unable to access TEMPERATURE MSR, giving up\n");
139	goto exit_free;
140	}
141
142	platform_set_drvdata(pdev, data);
143
144	err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
145	if (err)
146	goto exit_free;
147
148	data->hwmon_dev = hwmon_device_register(&pdev->dev);
149	if (IS_ERR(data->hwmon_dev)) {
150	err = PTR_ERR(data->hwmon_dev);
151	dev_err(&pdev->dev, "Class registration failed (%d)\n",
152	err);
153	goto exit_remove;
154	}
155
156	return 0;
157
158	exit_remove:
159	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
160	exit_free:
161	platform_set_drvdata(pdev, NULL);
162	kfree(data);
163	exit:
164	return err;
165	}
166
167	static int __devexit via_cputemp_remove(struct platform_device *pdev)
168	{
169	struct via_cputemp_data *data = platform_get_drvdata(pdev);
170
171	hwmon_device_unregister(data->hwmon_dev);
172	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
173	platform_set_drvdata(pdev, NULL);
174	kfree(data);
175	return 0;
176	}
177
178	static struct platform_driver via_cputemp_driver = {
179	.driver = {
180	.owner = THIS_MODULE,
181	.name = DRVNAME,
182	},
183	.probe = via_cputemp_probe,
184	.remove = __devexit_p(via_cputemp_remove),
185	};
186
187	struct pdev_entry {
188	struct list_head list;
189	struct platform_device *pdev;
190	unsigned int cpu;
191	};
192
193	static LIST_HEAD(pdev_list);
194	static DEFINE_MUTEX(pdev_list_mutex);
195
196	static int __cpuinit via_cputemp_device_add(unsigned int cpu)
197	{
198	int err;
199	struct platform_device *pdev;
200	struct pdev_entry *pdev_entry;
201
202	pdev = platform_device_alloc(DRVNAME, cpu);
203	if (!pdev) {
204	err = -ENOMEM;
205	printk(KERN_ERR DRVNAME ": Device allocation failed\n");
206	goto exit;
207	}
208
209	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
210	if (!pdev_entry) {
211	err = -ENOMEM;
212	goto exit_device_put;
213	}
214
215	err = platform_device_add(pdev);
216	if (err) {
217	printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
218	err);
219	goto exit_device_free;
220	}
221
222	pdev_entry->pdev = pdev;
223	pdev_entry->cpu = cpu;
224	mutex_lock(&pdev_list_mutex);
225	list_add_tail(&pdev_entry->list, &pdev_list);
226	mutex_unlock(&pdev_list_mutex);
227
228	return 0;
229
230	exit_device_free:
231	kfree(pdev_entry);
232	exit_device_put:
233	platform_device_put(pdev);
234	exit:
235	return err;
236	}
237
238	#ifdef CONFIG_HOTPLUG_CPU
a5f42a6b	239	static void __cpuinit via_cputemp_device_remove(unsigned int cpu)
70c38772 HW	240	{
	241	struct pdev_entry p, n;
	242	mutex_lock(&pdev_list_mutex);
	243	list_for_each_entry_safe(p, n, &pdev_list, list) {
	244	if (p->cpu == cpu) {
	245	platform_device_unregister(p->pdev);
	246	list_del(&p->list);
	247	kfree(p);
	248	}
	249	}
	250	mutex_unlock(&pdev_list_mutex);
	251	}
	252
	253	static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb,
	254	unsigned long action, void *hcpu)
	255	{
	256	unsigned int cpu = (unsigned long) hcpu;
	257
	258	switch (action) {
	259	case CPU_ONLINE:
	260	case CPU_DOWN_FAILED:
	261	via_cputemp_device_add(cpu);
	262	break;
	263	case CPU_DOWN_PREPARE:
	264	via_cputemp_device_remove(cpu);
	265	break;
	266	}
	267	return NOTIFY_OK;
	268	}
	269
	270	static struct notifier_block via_cputemp_cpu_notifier __refdata = {
	271	.notifier_call = via_cputemp_cpu_callback,
	272	};
	273	#endif /* !CONFIG_HOTPLUG_CPU */
	274
	275	static int __init via_cputemp_init(void)
	276	{
	277	int i, err;
	278	struct pdev_entry p, n;
	279
	280	if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) {
	281	printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n");
	282	err = -ENODEV;
	283	goto exit;
	284	}
	285
	286	err = platform_driver_register(&via_cputemp_driver);
	287	if (err)
	288	goto exit;
	289
	290	for_each_online_cpu(i) {
	291	struct cpuinfo_x86 *c = &cpu_data(i);
	292
	293	if (c->x86 != 6)
	294	continue;
	295
	296	if (c->x86_model < 0x0a)
	297	continue;
	298
	299	if (c->x86_model > 0x0f) {
	300	printk(KERN_WARNING DRVNAME ": Unknown CPU "
	301	"model 0x%x\n", c->x86_model);
	302	continue;
	303	}
304
305	err = via_cputemp_device_add(i);
306	if (err)
307	goto exit_devices_unreg;
308	}
309	if (list_empty(&pdev_list)) {
310	err = -ENODEV;
311	goto exit_driver_unreg;
312	}
313
314	#ifdef CONFIG_HOTPLUG_CPU
315	register_hotcpu_notifier(&via_cputemp_cpu_notifier);
316	#endif
317	return 0;
318
319	exit_devices_unreg:
320	mutex_lock(&pdev_list_mutex);
321	list_for_each_entry_safe(p, n, &pdev_list, list) {
322	platform_device_unregister(p->pdev);
323	list_del(&p->list);
324	kfree(p);
325	}
326	mutex_unlock(&pdev_list_mutex);
327	exit_driver_unreg:
328	platform_driver_unregister(&via_cputemp_driver);
329	exit:
330	return err;
331	}
332
333	static void __exit via_cputemp_exit(void)
334	{
335	struct pdev_entry p, n;
336	#ifdef CONFIG_HOTPLUG_CPU
337	unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
338	#endif
339	mutex_lock(&pdev_list_mutex);
340	list_for_each_entry_safe(p, n, &pdev_list, list) {
341	platform_device_unregister(p->pdev);
342	list_del(&p->list);
343	kfree(p);
344	}
345	mutex_unlock(&pdev_list_mutex);
346	platform_driver_unregister(&via_cputemp_driver);
347	}
348
349	MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
350	MODULE_DESCRIPTION("VIA CPU temperature monitor");
351	MODULE_LICENSE("GPL");
352
353	module_init(via_cputemp_init)
354	module_exit(via_cputemp_exit)