[mirror_ubuntu-bionic-kernel.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 cpu0_vid_show(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_RO(cpu0_vid);

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 = {
		.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_online(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 int via_cputemp_down_prep(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 0;
		}
	}
	mutex_unlock(&pdev_list_mutex);
	return 0;
}

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 enum cpuhp_state via_temp_online;

static int __init via_cputemp_init(void)
{
	int err;

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

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

	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online",
				via_cputemp_online, via_cputemp_down_prep);
	if (err < 0)
		goto exit_driver_unreg;
	via_temp_online = err;

#ifndef CONFIG_HOTPLUG_CPU
	if (list_empty(&pdev_list)) {
		err = -ENODEV;
		goto exit_hp_unreg;
	}
#endif
	return 0;

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

static void __exit via_cputemp_exit(void)
{
	cpuhp_remove_state(via_temp_online);
	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
1664d7fd JL	91	static ssize_t cpu0_vid_show(struct device *dev,
1664d7fd JL	92	struct device_attribute devattr, char buf)
764e043b JD	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	121	/* Optional attributes */
1664d7fd	122	static DEVICE_ATTR_RO(cpu0_vid);
764e043b	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 = {
70c38772 HW	208	.name = DRVNAME,
	209	},
	210	.probe = via_cputemp_probe,
9e5e9b7a	211	.remove = via_cputemp_remove,
70c38772 HW	212	};
	213
	214	struct pdev_entry {
	215	struct list_head list;
	216	struct platform_device *pdev;
	217	unsigned int cpu;
	218	};
	219
	220	static LIST_HEAD(pdev_list);
	221	static DEFINE_MUTEX(pdev_list_mutex);
	222
df60d701	223	static int via_cputemp_online(unsigned int cpu)
70c38772 HW	224	{
	225	int err;
	226	struct platform_device *pdev;
	227	struct pdev_entry *pdev_entry;
	228
	229	pdev = platform_device_alloc(DRVNAME, cpu);
	230	if (!pdev) {
	231	err = -ENOMEM;
edb8d53c	232	pr_err("Device allocation failed\n");
70c38772 HW	233	goto exit;
	234	}
	235
	236	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
	237	if (!pdev_entry) {
	238	err = -ENOMEM;
	239	goto exit_device_put;
	240	}
	241
	242	err = platform_device_add(pdev);
	243	if (err) {
edb8d53c	244	pr_err("Device addition failed (%d)\n", err);
70c38772 HW	245	goto exit_device_free;
	246	}
	247
	248	pdev_entry->pdev = pdev;
	249	pdev_entry->cpu = cpu;
	250	mutex_lock(&pdev_list_mutex);
	251	list_add_tail(&pdev_entry->list, &pdev_list);
	252	mutex_unlock(&pdev_list_mutex);
	253
	254	return 0;
	255
	256	exit_device_free:
	257	kfree(pdev_entry);
	258	exit_device_put:
	259	platform_device_put(pdev);
	260	exit:
	261	return err;
	262	}
	263
df60d701	264	static int via_cputemp_down_prep(unsigned int cpu)
70c38772	265	{
ae9e0ce7 JB	266	struct pdev_entry *p;
ae9e0ce7 JB	267
70c38772	268	mutex_lock(&pdev_list_mutex);
ae9e0ce7	269	list_for_each_entry(p, &pdev_list, list) {
70c38772 HW	270	if (p->cpu == cpu) {
	271	platform_device_unregister(p->pdev);
	272	list_del(&p->list);
ae9e0ce7	273	mutex_unlock(&pdev_list_mutex);
70c38772	274	kfree(p);
df60d701	275	return 0;
70c38772 HW	276	}
	277	}
	278	mutex_unlock(&pdev_list_mutex);
df60d701	279	return 0;
70c38772 HW	280	}
70c38772 HW	281
e273bd98	282	static const struct x86_cpu_id __initconst cputemp_ids[] = {
267fc978 AK	283	{ X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
	284	{ X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
	285	{ X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
	286	{}
	287	};
	288	MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
	289
df60d701 SAS	290	static enum cpuhp_state via_temp_online;
df60d701 SAS	291
70c38772 HW	292	static int __init via_cputemp_init(void)
70c38772 HW	293	{
df60d701	294	int err;
70c38772	295
267fc978 AK	296	if (!x86_match_cpu(cputemp_ids))
267fc978 AK	297	return -ENODEV;
70c38772 HW	298
	299	err = platform_driver_register(&via_cputemp_driver);
	300	if (err)
	301	goto exit;
	302
df60d701 SAS	303	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online",
	304	via_cputemp_online, via_cputemp_down_prep);
	305	if (err < 0)
	306	goto exit_driver_unreg;
	307	via_temp_online = err;
ae9e0ce7 JB	308
ae9e0ce7 JB	309	#ifndef CONFIG_HOTPLUG_CPU
70c38772 HW	310	if (list_empty(&pdev_list)) {
70c38772 HW	311	err = -ENODEV;
df60d701	312	goto exit_hp_unreg;
70c38772	313	}
ae9e0ce7	314	#endif
70c38772 HW	315	return 0;
70c38772 HW	316
ae9e0ce7	317	#ifndef CONFIG_HOTPLUG_CPU
df60d701 SAS	318	exit_hp_unreg:
	319	cpuhp_remove_state_nocalls(via_temp_online);
	320	#endif
70c38772 HW	321	exit_driver_unreg:
	322	platform_driver_unregister(&via_cputemp_driver);
	323	exit:
	324	return err;
	325	}
	326
	327	static void __exit via_cputemp_exit(void)
	328	{
df60d701	329	cpuhp_remove_state(via_temp_online);
70c38772 HW	330	platform_driver_unregister(&via_cputemp_driver);
	331	}
	332
	333	MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
	334	MODULE_DESCRIPTION("VIA CPU temperature monitor");
	335	MODULE_LICENSE("GPL");
	336
	337	module_init(via_cputemp_init)
	338	module_exit(via_cputemp_exit)