[linux-2.6-block.git] / drivers / hwmon / via-cputemp.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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>
 */

#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 name_show(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 temp_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_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_RO(temp1_input, temp, SHOW_TEMP);
static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL);
static SENSOR_DEVICE_ATTR_RO(name, name, 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";

	if (c->x86 == 7) {
		data->msr_temp = 0x1423;
	} else {
		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 void 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);
}

static struct platform_driver via_cputemp_driver = {
	.driver = {
		.name = DRVNAME,
	},
	.probe = via_cputemp_probe,
	.remove_new = 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_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_A,	NULL),
	X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_D,	NULL),
	X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_NANO,	NULL),
	X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY,		NULL),
	{}
};
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
935912c5	1	// SPDX-License-Identifier: GPL-2.0-only
70c38772 HW	2	/*
	3	* via-cputemp.c - Driver for VIA CPU core temperature monitoring
	4	* Copyright (C) 2009 VIA Technologies, Inc.
	5	*
	6	* based on existing coretemp.c, which is
	7	*
	8	* Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
70c38772 HW	9	*/
70c38772 HW	10
edb8d53c JP	11	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
edb8d53c JP	12
70c38772	13	#include <linux/module.h>
70c38772 HW	14	#include <linux/init.h>
70c38772 HW	15	#include <linux/slab.h>
70c38772	16	#include <linux/hwmon.h>
764e043b	17	#include <linux/hwmon-vid.h>
70c38772 HW	18	#include <linux/sysfs.h>
	19	#include <linux/hwmon-sysfs.h>
	20	#include <linux/err.h>
	21	#include <linux/mutex.h>
	22	#include <linux/list.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/cpu.h>
	25	#include <asm/msr.h>
	26	#include <asm/processor.h>
267fc978	27	#include <asm/cpu_device_id.h>
70c38772 HW	28
	29	#define DRVNAME "via_cputemp"
	30
f2799418	31	enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
70c38772 HW	32
	33	/*
	34	* Functions declaration
	35	*/
	36
	37	struct via_cputemp_data {
	38	struct device *hwmon_dev;
	39	const char *name;
764e043b	40	u8 vrm;
70c38772	41	u32 id;
764e043b JD	42	u32 msr_temp;
764e043b JD	43	u32 msr_vid;
70c38772 HW	44	};
	45
	46	/*
	47	* Sysfs stuff
	48	*/
	49
f74c24f8 GR	50	static ssize_t name_show(struct device dev, struct device_attribute devattr,
f74c24f8 GR	51	char *buf)
70c38772 HW	52	{
	53	int ret;
	54	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	55	struct via_cputemp_data *data = dev_get_drvdata(dev);
	56
	57	if (attr->index == SHOW_NAME)
	58	ret = sprintf(buf, "%s\n", data->name);
	59	else /* show label */
	60	ret = sprintf(buf, "Core %d\n", data->id);
	61	return ret;
	62	}
	63
f74c24f8 GR	64	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
f74c24f8 GR	65	char *buf)
70c38772 HW	66	{
	67	struct via_cputemp_data *data = dev_get_drvdata(dev);
	68	u32 eax, edx;
	69	int err;
	70
764e043b	71	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
70c38772 HW	72	if (err)
	73	return -EAGAIN;
	74
	75	return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
	76	}
	77
1664d7fd JL	78	static ssize_t cpu0_vid_show(struct device *dev,
1664d7fd JL	79	struct device_attribute devattr, char buf)
764e043b JD	80	{
	81	struct via_cputemp_data *data = dev_get_drvdata(dev);
	82	u32 eax, edx;
	83	int err;
	84
	85	err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
	86	if (err)
	87	return -EAGAIN;
	88
	89	return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
	90	}
	91
f74c24f8 GR	92	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, SHOW_TEMP);
	93	static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL);
	94	static SENSOR_DEVICE_ATTR_RO(name, name, SHOW_NAME);
70c38772 HW	95
	96	static struct attribute *via_cputemp_attributes[] = {
	97	&sensor_dev_attr_name.dev_attr.attr,
	98	&sensor_dev_attr_temp1_label.dev_attr.attr,
	99	&sensor_dev_attr_temp1_input.dev_attr.attr,
	100	NULL
	101	};
	102
	103	static const struct attribute_group via_cputemp_group = {
	104	.attrs = via_cputemp_attributes,
	105	};
	106
764e043b	107	/* Optional attributes */
1664d7fd	108	static DEVICE_ATTR_RO(cpu0_vid);
764e043b	109
6c931ae1	110	static int via_cputemp_probe(struct platform_device *pdev)
70c38772 HW	111	{
	112	struct via_cputemp_data *data;
	113	struct cpuinfo_x86 *c = &cpu_data(pdev->id);
	114	int err;
	115	u32 eax, edx;
	116
505dc0cc GR	117	data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
	118	GFP_KERNEL);
	119	if (!data)
	120	return -ENOMEM;
70c38772 HW	121
	122	data->id = pdev->id;
	123	data->name = "via_cputemp";
	124
e3a2d2be	125	if (c->x86 == 7) {
764e043b	126	data->msr_temp = 0x1423;
e3a2d2be	127	} else {
	128	switch (c->x86_model) {
	129	case 0xA:
	130	/* C7 A */
	131	case 0xD:
	132	/* C7 D */
	133	data->msr_temp = 0x1169;
	134	data->msr_vid = 0x198;
	135	break;
	136	case 0xF:
	137	/* Nano */
	138	data->msr_temp = 0x1423;
	139	break;
	140	default:
	141	return -ENODEV;
	142	}
70c38772 HW	143	}
	144
	145	/* test if we can access the TEMPERATURE MSR */
764e043b	146	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
70c38772 HW	147	if (err) {
	148	dev_err(&pdev->dev,
	149	"Unable to access TEMPERATURE MSR, giving up\n");
505dc0cc	150	return err;
70c38772 HW	151	}
	152
	153	platform_set_drvdata(pdev, data);
	154
	155	err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
	156	if (err)
505dc0cc	157	return err;
70c38772	158
764e043b JD	159	if (data->msr_vid)
	160	data->vrm = vid_which_vrm();
	161
	162	if (data->vrm) {
	163	err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
	164	if (err)
	165	goto exit_remove;
	166	}
	167
70c38772 HW	168	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	169	if (IS_ERR(data->hwmon_dev)) {
	170	err = PTR_ERR(data->hwmon_dev);
	171	dev_err(&pdev->dev, "Class registration failed (%d)\n",
	172	err);
	173	goto exit_remove;
	174	}
	175
	176	return 0;
	177
	178	exit_remove:
764e043b JD	179	if (data->vrm)
764e043b JD	180	device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
70c38772	181	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
70c38772 HW	182	return err;
	183	}
	184
88ac8226	185	static void via_cputemp_remove(struct platform_device *pdev)
70c38772 HW	186	{
	187	struct via_cputemp_data *data = platform_get_drvdata(pdev);
	188
	189	hwmon_device_unregister(data->hwmon_dev);
764e043b JD	190	if (data->vrm)
764e043b JD	191	device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
70c38772	192	sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
70c38772 HW	193	}
	194
	195	static struct platform_driver via_cputemp_driver = {
	196	.driver = {
70c38772 HW	197	.name = DRVNAME,
	198	},
	199	.probe = via_cputemp_probe,
88ac8226	200	.remove_new = via_cputemp_remove,
70c38772 HW	201	};
	202
	203	struct pdev_entry {
	204	struct list_head list;
	205	struct platform_device *pdev;
	206	unsigned int cpu;
	207	};
	208
	209	static LIST_HEAD(pdev_list);
	210	static DEFINE_MUTEX(pdev_list_mutex);
	211
df60d701	212	static int via_cputemp_online(unsigned int cpu)
70c38772 HW	213	{
	214	int err;
	215	struct platform_device *pdev;
	216	struct pdev_entry *pdev_entry;
	217
	218	pdev = platform_device_alloc(DRVNAME, cpu);
	219	if (!pdev) {
	220	err = -ENOMEM;
edb8d53c	221	pr_err("Device allocation failed\n");
70c38772 HW	222	goto exit;
	223	}
	224
	225	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
	226	if (!pdev_entry) {
	227	err = -ENOMEM;
	228	goto exit_device_put;
	229	}
	230
	231	err = platform_device_add(pdev);
	232	if (err) {
edb8d53c	233	pr_err("Device addition failed (%d)\n", err);
70c38772 HW	234	goto exit_device_free;
	235	}
	236
	237	pdev_entry->pdev = pdev;
	238	pdev_entry->cpu = cpu;
	239	mutex_lock(&pdev_list_mutex);
	240	list_add_tail(&pdev_entry->list, &pdev_list);
	241	mutex_unlock(&pdev_list_mutex);
	242
	243	return 0;
	244
	245	exit_device_free:
	246	kfree(pdev_entry);
	247	exit_device_put:
	248	platform_device_put(pdev);
	249	exit:
	250	return err;
	251	}
	252
df60d701	253	static int via_cputemp_down_prep(unsigned int cpu)
70c38772	254	{
ae9e0ce7 JB	255	struct pdev_entry *p;
ae9e0ce7 JB	256
70c38772	257	mutex_lock(&pdev_list_mutex);
ae9e0ce7	258	list_for_each_entry(p, &pdev_list, list) {
70c38772 HW	259	if (p->cpu == cpu) {
	260	platform_device_unregister(p->pdev);
	261	list_del(&p->list);
ae9e0ce7	262	mutex_unlock(&pdev_list_mutex);
70c38772	263	kfree(p);
df60d701	264	return 0;
70c38772 HW	265	}
	266	}
	267	mutex_unlock(&pdev_list_mutex);
df60d701	268	return 0;
70c38772 HW	269	}
70c38772 HW	270
e273bd98	271	static const struct x86_cpu_id __initconst cputemp_ids[] = {
5cfc7ac7 TG	272	X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_A, NULL),
	273	X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_D, NULL),
	274	X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_NANO, NULL),
	275	X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY, NULL),
267fc978 AK	276	{}
	277	};
	278	MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
	279
df60d701 SAS	280	static enum cpuhp_state via_temp_online;
df60d701 SAS	281
70c38772 HW	282	static int __init via_cputemp_init(void)
70c38772 HW	283	{
df60d701	284	int err;
70c38772	285
267fc978 AK	286	if (!x86_match_cpu(cputemp_ids))
267fc978 AK	287	return -ENODEV;
70c38772 HW	288
	289	err = platform_driver_register(&via_cputemp_driver);
	290	if (err)
	291	goto exit;
	292
df60d701 SAS	293	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online",
	294	via_cputemp_online, via_cputemp_down_prep);
	295	if (err < 0)
	296	goto exit_driver_unreg;
	297	via_temp_online = err;
ae9e0ce7 JB	298
ae9e0ce7 JB	299	#ifndef CONFIG_HOTPLUG_CPU
70c38772 HW	300	if (list_empty(&pdev_list)) {
70c38772 HW	301	err = -ENODEV;
df60d701	302	goto exit_hp_unreg;
70c38772	303	}
ae9e0ce7	304	#endif
70c38772 HW	305	return 0;
70c38772 HW	306
ae9e0ce7	307	#ifndef CONFIG_HOTPLUG_CPU
df60d701 SAS	308	exit_hp_unreg:
	309	cpuhp_remove_state_nocalls(via_temp_online);
	310	#endif
70c38772 HW	311	exit_driver_unreg:
	312	platform_driver_unregister(&via_cputemp_driver);
	313	exit:
	314	return err;
	315	}
	316
	317	static void __exit via_cputemp_exit(void)
	318	{
df60d701	319	cpuhp_remove_state(via_temp_online);
70c38772 HW	320	platform_driver_unregister(&via_cputemp_driver);
	321	}
	322
	323	MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
	324	MODULE_DESCRIPTION("VIA CPU temperature monitor");
	325	MODULE_LICENSE("GPL");
	326
	327	module_init(via_cputemp_init)
	328	module_exit(via_cputemp_exit)