hwmon.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
   4 *
   5 * This file defines the sysfs class "hwmon", for use by sensors drivers.
   6 *
   7 * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
   8 */
   9
  10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12#include <linux/bitops.h>
  13#include <linux/device.h>
  14#include <linux/err.h>
  15#include <linux/gfp.h>
  16#include <linux/hwmon.h>
  17#include <linux/i2c.h>
  18#include <linux/idr.h>
  19#include <linux/kstrtox.h>
  20#include <linux/list.h>
  21#include <linux/module.h>
  22#include <linux/mutex.h>
  23#include <linux/pci.h>
  24#include <linux/property.h>
  25#include <linux/slab.h>
  26#include <linux/string.h>
  27#include <linux/thermal.h>
  28
  29#define CREATE_TRACE_POINTS
  30#include <trace/events/hwmon.h>
  31
  32#define HWMON_ID_PREFIX "hwmon"
  33#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  34
  35struct hwmon_device {
  36	const char *name;
  37	const char *label;
  38	struct device dev;
  39	const struct hwmon_chip_info *chip;
  40	struct mutex lock;
  41	struct list_head tzdata;
  42	struct attribute_group group;
  43	const struct attribute_group **groups;
  44};
  45
  46#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
  47
  48#define MAX_SYSFS_ATTR_NAME_LENGTH	32
  49
  50struct hwmon_device_attribute {
  51	struct device_attribute dev_attr;
  52	const struct hwmon_ops *ops;
  53	enum hwmon_sensor_types type;
  54	u32 attr;
  55	int index;
  56	char name[MAX_SYSFS_ATTR_NAME_LENGTH];
  57};
  58
  59#define to_hwmon_attr(d) \
  60	container_of(d, struct hwmon_device_attribute, dev_attr)
  61#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
  62
  63/*
  64 * Thermal zone information
  65 */
  66struct hwmon_thermal_data {
  67	struct list_head node;		/* hwmon tzdata list entry */
  68	struct device *dev;		/* Reference to hwmon device */
  69	int index;			/* sensor index */
  70	struct thermal_zone_device *tzd;/* thermal zone device */
  71};
  72
  73static ssize_t
  74name_show(struct device *dev, struct device_attribute *attr, char *buf)
  75{
  76	return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  77}
  78static DEVICE_ATTR_RO(name);
  79
  80static ssize_t
  81label_show(struct device *dev, struct device_attribute *attr, char *buf)
  82{
  83	return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label);
  84}
  85static DEVICE_ATTR_RO(label);
  86
  87static struct attribute *hwmon_dev_attrs[] = {
  88	&dev_attr_name.attr,
  89	&dev_attr_label.attr,
  90	NULL
  91};
  92
  93static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj,
  94					 struct attribute *attr, int n)
  95{
  96	struct device *dev = kobj_to_dev(kobj);
  97	struct hwmon_device *hdev = to_hwmon_device(dev);
  98
  99	if (attr == &dev_attr_name.attr && hdev->name == NULL)
 100		return 0;
 101
 102	if (attr == &dev_attr_label.attr && hdev->label == NULL)
 103		return 0;
 104
 105	return attr->mode;
 106}
 107
 108static const struct attribute_group hwmon_dev_attr_group = {
 109	.attrs		= hwmon_dev_attrs,
 110	.is_visible	= hwmon_dev_attr_is_visible,
 111};
 112
 113static const struct attribute_group *hwmon_dev_attr_groups[] = {
 114	&hwmon_dev_attr_group,
 115	NULL
 116};
 117
 118static void hwmon_free_attrs(struct attribute **attrs)
 119{
 120	int i;
 121
 122	for (i = 0; attrs[i]; i++) {
 123		struct device_attribute *dattr = to_dev_attr(attrs[i]);
 124		struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
 125
 126		kfree(hattr);
 127	}
 128	kfree(attrs);
 129}
 130
 131static void hwmon_dev_release(struct device *dev)
 132{
 133	struct hwmon_device *hwdev = to_hwmon_device(dev);
 134
 135	if (hwdev->group.attrs)
 136		hwmon_free_attrs(hwdev->group.attrs);
 137	kfree(hwdev->groups);
 138	kfree(hwdev->label);
 139	kfree(hwdev);
 140}
 141
 142static const struct class hwmon_class = {
 143	.name = "hwmon",
 144	.dev_groups = hwmon_dev_attr_groups,
 145	.dev_release = hwmon_dev_release,
 146};
 147
 148static DEFINE_IDA(hwmon_ida);
 149
 150static umode_t hwmon_is_visible(const struct hwmon_ops *ops,
 151				const void *drvdata,
 152				enum hwmon_sensor_types type,
 153				u32 attr, int channel)
 154{
 155	if (ops->visible)
 156		return ops->visible;
 157
 158	return ops->is_visible(drvdata, type, attr, channel);
 159}
 160
 161/* Thermal zone handling */
 162
 163static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
 164{
 165	struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
 166	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 167	int ret;
 168	long t;
 169
 170	guard(mutex)(&hwdev->lock);
 171
 172	ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
 173				     tdata->index, &t);
 174	if (ret < 0)
 175		return ret;
 176
 177	*temp = t;
 178
 179	return 0;
 180}
 181
 182static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
 183{
 184	struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
 185	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 186	const struct hwmon_chip_info *chip = hwdev->chip;
 187	const struct hwmon_channel_info * const *info = chip->info;
 188	unsigned int i;
 189	int err;
 190
 191	if (!chip->ops->write)
 192		return 0;
 193
 194	for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
 195		continue;
 196
 197	if (!info[i])
 198		return 0;
 199
 200	guard(mutex)(&hwdev->lock);
 201
 202	if (info[i]->config[tdata->index] & HWMON_T_MIN) {
 203		err = chip->ops->write(tdata->dev, hwmon_temp,
 204				       hwmon_temp_min, tdata->index, low);
 205		if (err && err != -EOPNOTSUPP)
 206			return err;
 207	}
 208
 209	if (info[i]->config[tdata->index] & HWMON_T_MAX) {
 210		err = chip->ops->write(tdata->dev, hwmon_temp,
 211				       hwmon_temp_max, tdata->index, high);
 212		if (err && err != -EOPNOTSUPP)
 213			return err;
 214	}
 215
 216	return 0;
 217}
 218
 219static const struct thermal_zone_device_ops hwmon_thermal_ops = {
 220	.get_temp = hwmon_thermal_get_temp,
 221	.set_trips = hwmon_thermal_set_trips,
 222};
 223
 224static void hwmon_thermal_remove_sensor(void *data)
 225{
 226	list_del(data);
 227}
 228
 229static int hwmon_thermal_add_sensor(struct device *dev, int index)
 230{
 231	struct hwmon_device *hwdev = to_hwmon_device(dev);
 232	struct hwmon_thermal_data *tdata;
 233	struct thermal_zone_device *tzd;
 234	int err;
 235
 236	tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 237	if (!tdata)
 238		return -ENOMEM;
 239
 240	tdata->dev = dev;
 241	tdata->index = index;
 242
 243	tzd = devm_thermal_of_zone_register(dev, index, tdata,
 244					    &hwmon_thermal_ops);
 245	if (IS_ERR(tzd)) {
 246		if (PTR_ERR(tzd) != -ENODEV)
 247			return PTR_ERR(tzd);
 248		dev_info(dev, "temp%d_input not attached to any thermal zone\n",
 249			 index + 1);
 250		devm_kfree(dev, tdata);
 251		return 0;
 252	}
 253
 254	err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
 255	if (err)
 256		return err;
 257
 258	tdata->tzd = tzd;
 259	list_add(&tdata->node, &hwdev->tzdata);
 260
 261	return 0;
 262}
 263
 264static int hwmon_thermal_register_sensors(struct device *dev)
 265{
 266	struct hwmon_device *hwdev = to_hwmon_device(dev);
 267	const struct hwmon_chip_info *chip = hwdev->chip;
 268	const struct hwmon_channel_info * const *info = chip->info;
 269	void *drvdata = dev_get_drvdata(dev);
 270	int i;
 271
 272	if (!IS_ENABLED(CONFIG_THERMAL_OF))
 273		return 0;
 274
 275	for (i = 1; info[i]; i++) {
 276		int j;
 277
 278		if (info[i]->type != hwmon_temp)
 279			continue;
 280
 281		for (j = 0; info[i]->config[j]; j++) {
 282			int err;
 283
 284			if (!(info[i]->config[j] & HWMON_T_INPUT) ||
 285			    !hwmon_is_visible(chip->ops, drvdata, hwmon_temp,
 286					      hwmon_temp_input, j))
 287				continue;
 288
 289			err = hwmon_thermal_add_sensor(dev, j);
 290			if (err)
 291				return err;
 292		}
 293	}
 294
 295	return 0;
 296}
 297
 298static void hwmon_thermal_notify(struct device *dev, int index)
 299{
 300	struct hwmon_device *hwdev = to_hwmon_device(dev);
 301	struct hwmon_thermal_data *tzdata;
 302
 303	if (!IS_ENABLED(CONFIG_THERMAL_OF))
 304		return;
 305
 306	list_for_each_entry(tzdata, &hwdev->tzdata, node) {
 307		if (tzdata->index == index) {
 308			thermal_zone_device_update(tzdata->tzd,
 309						   THERMAL_EVENT_UNSPECIFIED);
 310		}
 311	}
 312}
 313
 314static int hwmon_attr_base(enum hwmon_sensor_types type)
 315{
 316	if (type == hwmon_in || type == hwmon_intrusion)
 317		return 0;
 318	return 1;
 319}
 320
 321#if IS_REACHABLE(CONFIG_I2C)
 322
 323/*
 324 * PEC support
 325 *
 326 * The 'pec' attribute is attached to I2C client devices. It is only provided
 327 * if the i2c controller supports PEC.
 328 *
 329 * The mutex ensures that PEC configuration between i2c device and the hardware
 330 * is consistent. Use a single mutex because attribute writes are supposed to be
 331 * rare, and maintaining a separate mutex for each hardware monitoring device
 332 * would add substantial complexity to the driver for little if any gain.
 333 *
 334 * The hardware monitoring device is identified as child of the i2c client
 335 * device. This assumes that only a single hardware monitoring device is
 336 * attached to an i2c client device.
 337 */
 338
 339static int hwmon_match_device(struct device *dev, const void *data)
 340{
 341	return dev->class == &hwmon_class;
 342}
 343
 344static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
 345			char *buf)
 346{
 347	struct i2c_client *client = to_i2c_client(dev);
 348
 349	return sysfs_emit(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
 350}
 351
 352static ssize_t pec_store(struct device *dev, struct device_attribute *devattr,
 353			 const char *buf, size_t count)
 354{
 355	struct i2c_client *client = to_i2c_client(dev);
 356	struct hwmon_device *hwdev;
 357	struct device *hdev;
 358	bool val;
 359	int err;
 360
 361	err = kstrtobool(buf, &val);
 362	if (err < 0)
 363		return err;
 364
 365	hdev = device_find_child(dev, NULL, hwmon_match_device);
 366	if (!hdev)
 367		return -ENODEV;
 368
 369	/*
 370	 * If there is no write function, we assume that chip specific
 371	 * handling is not required.
 372	 */
 373	hwdev = to_hwmon_device(hdev);
 374	guard(mutex)(&hwdev->lock);
 375	if (hwdev->chip->ops->write) {
 376		err = hwdev->chip->ops->write(hdev, hwmon_chip, hwmon_chip_pec, 0, val);
 377		if (err && err != -EOPNOTSUPP)
 378			goto put;
 379	}
 380
 381	if (!val)
 382		client->flags &= ~I2C_CLIENT_PEC;
 383	else
 384		client->flags |= I2C_CLIENT_PEC;
 385
 386	err = count;
 387put:
 388	put_device(hdev);
 389
 390	return err;
 391}
 392
 393static DEVICE_ATTR_RW(pec);
 394
 395static void hwmon_remove_pec(void *dev)
 396{
 397	device_remove_file(dev, &dev_attr_pec);
 398}
 399
 400static int hwmon_pec_register(struct device *hdev)
 401{
 402	struct i2c_client *client = i2c_verify_client(hdev->parent);
 403	int err;
 404
 405	if (!client)
 406		return -EINVAL;
 407
 408	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC))
 409		return 0;
 410
 411	err = device_create_file(&client->dev, &dev_attr_pec);
 412	if (err)
 413		return err;
 414
 415	return devm_add_action_or_reset(hdev, hwmon_remove_pec, &client->dev);
 416}
 417
 418#else /* CONFIG_I2C */
 419static int hwmon_pec_register(struct device *hdev)
 420{
 421	return -EINVAL;
 422}
 423#endif /* CONFIG_I2C */
 424
 425/* sysfs attribute management */
 426
 427static ssize_t hwmon_attr_show(struct device *dev,
 428			       struct device_attribute *devattr, char *buf)
 429{
 430	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 431	struct hwmon_device *hwdev = to_hwmon_device(dev);
 432	s64 val64;
 433	long val;
 434	int ret;
 435
 436	guard(mutex)(&hwdev->lock);
 437
 438	ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 439			       (hattr->type == hwmon_energy64) ? (long *)&val64 : &val);
 440	if (ret < 0)
 441		return ret;
 442
 443	if (hattr->type != hwmon_energy64)
 444		val64 = val;
 445
 446	trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
 447			      hattr->name, val64);
 448
 449	return sprintf(buf, "%lld\n", val64);
 450}
 451
 452static ssize_t hwmon_attr_show_string(struct device *dev,
 453				      struct device_attribute *devattr,
 454				      char *buf)
 455{
 456	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 457	struct hwmon_device *hwdev = to_hwmon_device(dev);
 458	enum hwmon_sensor_types type = hattr->type;
 459	const char *s;
 460	int ret;
 461
 462	guard(mutex)(&hwdev->lock);
 463
 464	ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 465				      hattr->index, &s);
 466	if (ret < 0)
 467		return ret;
 468
 469	trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
 470				     hattr->name, s);
 471
 472	return sprintf(buf, "%s\n", s);
 473}
 474
 475static ssize_t hwmon_attr_store(struct device *dev,
 476				struct device_attribute *devattr,
 477				const char *buf, size_t count)
 478{
 479	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 480	struct hwmon_device *hwdev = to_hwmon_device(dev);
 481	long val;
 482	int ret;
 483
 484	ret = kstrtol(buf, 10, &val);
 485	if (ret < 0)
 486		return ret;
 487
 488	guard(mutex)(&hwdev->lock);
 489
 490	ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 491				val);
 492	if (ret < 0)
 493		return ret;
 494
 495	trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
 496			       hattr->name, (s64)val);
 497
 498	return count;
 499}
 500
 501static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 502{
 503	return (type == hwmon_temp && attr == hwmon_temp_label) ||
 504	       (type == hwmon_in && attr == hwmon_in_label) ||
 505	       (type == hwmon_curr && attr == hwmon_curr_label) ||
 506	       (type == hwmon_power && attr == hwmon_power_label) ||
 507	       (type == hwmon_energy && attr == hwmon_energy_label) ||
 508	       (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 509	       (type == hwmon_fan && attr == hwmon_fan_label);
 510}
 511
 512static struct attribute *hwmon_genattr(const void *drvdata,
 513				       enum hwmon_sensor_types type,
 514				       u32 attr,
 515				       int index,
 516				       const char *template,
 517				       const struct hwmon_ops *ops)
 518{
 519	struct hwmon_device_attribute *hattr;
 520	struct device_attribute *dattr;
 521	struct attribute *a;
 522	umode_t mode;
 523	const char *name;
 524	bool is_string = is_string_attr(type, attr);
 525
 526	mode = hwmon_is_visible(ops, drvdata, type, attr, index);
 527	if (!mode)
 528		return ERR_PTR(-ENOENT);
 529
 530	if ((mode & 0444) && ((is_string && !ops->read_string) ||
 531				 (!is_string && !ops->read)))
 532		return ERR_PTR(-EINVAL);
 533	if ((mode & 0222) && !ops->write)
 534		return ERR_PTR(-EINVAL);
 535
 536	hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
 537	if (!hattr)
 538		return ERR_PTR(-ENOMEM);
 539
 540	if (type == hwmon_chip) {
 541		name = template;
 542	} else {
 543		scnprintf(hattr->name, sizeof(hattr->name), template,
 544			  index + hwmon_attr_base(type));
 545		name = hattr->name;
 546	}
 547
 548	hattr->type = type;
 549	hattr->attr = attr;
 550	hattr->index = index;
 551	hattr->ops = ops;
 552
 553	dattr = &hattr->dev_attr;
 554	dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 555	dattr->store = hwmon_attr_store;
 556
 557	a = &dattr->attr;
 558	sysfs_attr_init(a);
 559	a->name = name;
 560	a->mode = mode;
 561
 562	return a;
 563}
 564
 565/*
 566 * Chip attributes are not attribute templates but actual sysfs attributes.
 567 * See hwmon_genattr() for special handling.
 568 */
 569static const char * const hwmon_chip_attrs[] = {
 570	[hwmon_chip_temp_reset_history] = "temp_reset_history",
 571	[hwmon_chip_in_reset_history] = "in_reset_history",
 572	[hwmon_chip_curr_reset_history] = "curr_reset_history",
 573	[hwmon_chip_power_reset_history] = "power_reset_history",
 574	[hwmon_chip_update_interval] = "update_interval",
 575	[hwmon_chip_alarms] = "alarms",
 576	[hwmon_chip_samples] = "samples",
 577	[hwmon_chip_curr_samples] = "curr_samples",
 578	[hwmon_chip_in_samples] = "in_samples",
 579	[hwmon_chip_power_samples] = "power_samples",
 580	[hwmon_chip_temp_samples] = "temp_samples",
 581	[hwmon_chip_beep_enable] = "beep_enable",
 582};
 583
 584static const char * const hwmon_temp_attr_templates[] = {
 585	[hwmon_temp_enable] = "temp%d_enable",
 586	[hwmon_temp_input] = "temp%d_input",
 587	[hwmon_temp_type] = "temp%d_type",
 588	[hwmon_temp_lcrit] = "temp%d_lcrit",
 589	[hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 590	[hwmon_temp_min] = "temp%d_min",
 591	[hwmon_temp_min_hyst] = "temp%d_min_hyst",
 592	[hwmon_temp_max] = "temp%d_max",
 593	[hwmon_temp_max_hyst] = "temp%d_max_hyst",
 594	[hwmon_temp_crit] = "temp%d_crit",
 595	[hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 596	[hwmon_temp_emergency] = "temp%d_emergency",
 597	[hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 598	[hwmon_temp_alarm] = "temp%d_alarm",
 599	[hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 600	[hwmon_temp_min_alarm] = "temp%d_min_alarm",
 601	[hwmon_temp_max_alarm] = "temp%d_max_alarm",
 602	[hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 603	[hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 604	[hwmon_temp_fault] = "temp%d_fault",
 605	[hwmon_temp_offset] = "temp%d_offset",
 606	[hwmon_temp_label] = "temp%d_label",
 607	[hwmon_temp_lowest] = "temp%d_lowest",
 608	[hwmon_temp_highest] = "temp%d_highest",
 609	[hwmon_temp_reset_history] = "temp%d_reset_history",
 610	[hwmon_temp_rated_min] = "temp%d_rated_min",
 611	[hwmon_temp_rated_max] = "temp%d_rated_max",
 612	[hwmon_temp_beep] = "temp%d_beep",
 613};
 614
 615static const char * const hwmon_in_attr_templates[] = {
 616	[hwmon_in_enable] = "in%d_enable",
 617	[hwmon_in_input] = "in%d_input",
 618	[hwmon_in_min] = "in%d_min",
 619	[hwmon_in_max] = "in%d_max",
 620	[hwmon_in_lcrit] = "in%d_lcrit",
 621	[hwmon_in_crit] = "in%d_crit",
 622	[hwmon_in_average] = "in%d_average",
 623	[hwmon_in_lowest] = "in%d_lowest",
 624	[hwmon_in_highest] = "in%d_highest",
 625	[hwmon_in_reset_history] = "in%d_reset_history",
 626	[hwmon_in_label] = "in%d_label",
 627	[hwmon_in_alarm] = "in%d_alarm",
 628	[hwmon_in_min_alarm] = "in%d_min_alarm",
 629	[hwmon_in_max_alarm] = "in%d_max_alarm",
 630	[hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 631	[hwmon_in_crit_alarm] = "in%d_crit_alarm",
 632	[hwmon_in_rated_min] = "in%d_rated_min",
 633	[hwmon_in_rated_max] = "in%d_rated_max",
 634	[hwmon_in_beep] = "in%d_beep",
 635	[hwmon_in_fault] = "in%d_fault",
 636};
 637
 638static const char * const hwmon_curr_attr_templates[] = {
 639	[hwmon_curr_enable] = "curr%d_enable",
 640	[hwmon_curr_input] = "curr%d_input",
 641	[hwmon_curr_min] = "curr%d_min",
 642	[hwmon_curr_max] = "curr%d_max",
 643	[hwmon_curr_lcrit] = "curr%d_lcrit",
 644	[hwmon_curr_crit] = "curr%d_crit",
 645	[hwmon_curr_average] = "curr%d_average",
 646	[hwmon_curr_lowest] = "curr%d_lowest",
 647	[hwmon_curr_highest] = "curr%d_highest",
 648	[hwmon_curr_reset_history] = "curr%d_reset_history",
 649	[hwmon_curr_label] = "curr%d_label",
 650	[hwmon_curr_alarm] = "curr%d_alarm",
 651	[hwmon_curr_min_alarm] = "curr%d_min_alarm",
 652	[hwmon_curr_max_alarm] = "curr%d_max_alarm",
 653	[hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 654	[hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 655	[hwmon_curr_rated_min] = "curr%d_rated_min",
 656	[hwmon_curr_rated_max] = "curr%d_rated_max",
 657	[hwmon_curr_beep] = "curr%d_beep",
 658};
 659
 660static const char * const hwmon_power_attr_templates[] = {
 661	[hwmon_power_enable] = "power%d_enable",
 662	[hwmon_power_average] = "power%d_average",
 663	[hwmon_power_average_interval] = "power%d_average_interval",
 664	[hwmon_power_average_interval_max] = "power%d_average_interval_max",
 665	[hwmon_power_average_interval_min] = "power%d_average_interval_min",
 666	[hwmon_power_average_highest] = "power%d_average_highest",
 667	[hwmon_power_average_lowest] = "power%d_average_lowest",
 668	[hwmon_power_average_max] = "power%d_average_max",
 669	[hwmon_power_average_min] = "power%d_average_min",
 670	[hwmon_power_input] = "power%d_input",
 671	[hwmon_power_input_highest] = "power%d_input_highest",
 672	[hwmon_power_input_lowest] = "power%d_input_lowest",
 673	[hwmon_power_reset_history] = "power%d_reset_history",
 674	[hwmon_power_accuracy] = "power%d_accuracy",
 675	[hwmon_power_cap] = "power%d_cap",
 676	[hwmon_power_cap_hyst] = "power%d_cap_hyst",
 677	[hwmon_power_cap_max] = "power%d_cap_max",
 678	[hwmon_power_cap_min] = "power%d_cap_min",
 679	[hwmon_power_min] = "power%d_min",
 680	[hwmon_power_max] = "power%d_max",
 681	[hwmon_power_lcrit] = "power%d_lcrit",
 682	[hwmon_power_crit] = "power%d_crit",
 683	[hwmon_power_label] = "power%d_label",
 684	[hwmon_power_alarm] = "power%d_alarm",
 685	[hwmon_power_cap_alarm] = "power%d_cap_alarm",
 686	[hwmon_power_min_alarm] = "power%d_min_alarm",
 687	[hwmon_power_max_alarm] = "power%d_max_alarm",
 688	[hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
 689	[hwmon_power_crit_alarm] = "power%d_crit_alarm",
 690	[hwmon_power_rated_min] = "power%d_rated_min",
 691	[hwmon_power_rated_max] = "power%d_rated_max",
 692};
 693
 694static const char * const hwmon_energy_attr_templates[] = {
 695	[hwmon_energy_enable] = "energy%d_enable",
 696	[hwmon_energy_input] = "energy%d_input",
 697	[hwmon_energy_label] = "energy%d_label",
 698};
 699
 700static const char * const hwmon_humidity_attr_templates[] = {
 701	[hwmon_humidity_enable] = "humidity%d_enable",
 702	[hwmon_humidity_input] = "humidity%d_input",
 703	[hwmon_humidity_label] = "humidity%d_label",
 704	[hwmon_humidity_min] = "humidity%d_min",
 705	[hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 706	[hwmon_humidity_max] = "humidity%d_max",
 707	[hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 708	[hwmon_humidity_alarm] = "humidity%d_alarm",
 709	[hwmon_humidity_fault] = "humidity%d_fault",
 710	[hwmon_humidity_rated_min] = "humidity%d_rated_min",
 711	[hwmon_humidity_rated_max] = "humidity%d_rated_max",
 712	[hwmon_humidity_min_alarm] = "humidity%d_min_alarm",
 713	[hwmon_humidity_max_alarm] = "humidity%d_max_alarm",
 714};
 715
 716static const char * const hwmon_fan_attr_templates[] = {
 717	[hwmon_fan_enable] = "fan%d_enable",
 718	[hwmon_fan_input] = "fan%d_input",
 719	[hwmon_fan_label] = "fan%d_label",
 720	[hwmon_fan_min] = "fan%d_min",
 721	[hwmon_fan_max] = "fan%d_max",
 722	[hwmon_fan_div] = "fan%d_div",
 723	[hwmon_fan_pulses] = "fan%d_pulses",
 724	[hwmon_fan_target] = "fan%d_target",
 725	[hwmon_fan_alarm] = "fan%d_alarm",
 726	[hwmon_fan_min_alarm] = "fan%d_min_alarm",
 727	[hwmon_fan_max_alarm] = "fan%d_max_alarm",
 728	[hwmon_fan_fault] = "fan%d_fault",
 729	[hwmon_fan_beep] = "fan%d_beep",
 730};
 731
 732static const char * const hwmon_pwm_attr_templates[] = {
 733	[hwmon_pwm_input] = "pwm%d",
 734	[hwmon_pwm_enable] = "pwm%d_enable",
 735	[hwmon_pwm_mode] = "pwm%d_mode",
 736	[hwmon_pwm_freq] = "pwm%d_freq",
 737	[hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp",
 738};
 739
 740static const char * const hwmon_intrusion_attr_templates[] = {
 741	[hwmon_intrusion_alarm] = "intrusion%d_alarm",
 742	[hwmon_intrusion_beep]  = "intrusion%d_beep",
 743};
 744
 745static const char * const *__templates[] = {
 746	[hwmon_chip] = hwmon_chip_attrs,
 747	[hwmon_temp] = hwmon_temp_attr_templates,
 748	[hwmon_in] = hwmon_in_attr_templates,
 749	[hwmon_curr] = hwmon_curr_attr_templates,
 750	[hwmon_power] = hwmon_power_attr_templates,
 751	[hwmon_energy] = hwmon_energy_attr_templates,
 752	[hwmon_energy64] = hwmon_energy_attr_templates,
 753	[hwmon_humidity] = hwmon_humidity_attr_templates,
 754	[hwmon_fan] = hwmon_fan_attr_templates,
 755	[hwmon_pwm] = hwmon_pwm_attr_templates,
 756	[hwmon_intrusion] = hwmon_intrusion_attr_templates,
 757};
 758
 759static const int __templates_size[] = {
 760	[hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 761	[hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 762	[hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 763	[hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 764	[hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 765	[hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 766	[hwmon_energy64] = ARRAY_SIZE(hwmon_energy_attr_templates),
 767	[hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 768	[hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 769	[hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 770	[hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
 771};
 772
 773int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
 774		       u32 attr, int channel)
 775{
 776	char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
 777	char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
 778	char *envp[] = { event, NULL };
 779	const char * const *templates;
 780	const char *template;
 781	int base;
 782
 783	if (type >= ARRAY_SIZE(__templates))
 784		return -EINVAL;
 785	if (attr >= __templates_size[type])
 786		return -EINVAL;
 787
 788	templates = __templates[type];
 789	template = templates[attr];
 790
 791	base = hwmon_attr_base(type);
 792
 793	scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
 794	scnprintf(event, sizeof(event), "NAME=%s", sattr);
 795	sysfs_notify(&dev->kobj, NULL, sattr);
 796	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 797
 798	if (type == hwmon_temp)
 799		hwmon_thermal_notify(dev, channel);
 800
 801	return 0;
 802}
 803EXPORT_SYMBOL_GPL(hwmon_notify_event);
 804
 805void hwmon_lock(struct device *dev)
 806{
 807	struct hwmon_device *hwdev = to_hwmon_device(dev);
 808
 809	mutex_lock(&hwdev->lock);
 810}
 811EXPORT_SYMBOL_GPL(hwmon_lock);
 812
 813void hwmon_unlock(struct device *dev)
 814{
 815	struct hwmon_device *hwdev = to_hwmon_device(dev);
 816
 817	mutex_unlock(&hwdev->lock);
 818}
 819EXPORT_SYMBOL_GPL(hwmon_unlock);
 820
 821static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 822{
 823	int i, n;
 824
 825	for (i = n = 0; info->config[i]; i++)
 826		n += hweight32(info->config[i]);
 827
 828	return n;
 829}
 830
 831static int hwmon_genattrs(const void *drvdata,
 832			  struct attribute **attrs,
 833			  const struct hwmon_ops *ops,
 834			  const struct hwmon_channel_info *info)
 835{
 836	const char * const *templates;
 837	int template_size;
 838	int i, aindex = 0;
 839
 840	if (info->type >= ARRAY_SIZE(__templates))
 841		return -EINVAL;
 842
 843	templates = __templates[info->type];
 844	template_size = __templates_size[info->type];
 845
 846	for (i = 0; info->config[i]; i++) {
 847		u32 attr_mask = info->config[i];
 848		u32 attr;
 849
 850		while (attr_mask) {
 851			struct attribute *a;
 852
 853			attr = __ffs(attr_mask);
 854			attr_mask &= ~BIT(attr);
 855			if (attr >= template_size || !templates[attr])
 856				continue;	/* attribute is invisible */
 857			a = hwmon_genattr(drvdata, info->type, attr, i,
 858					  templates[attr], ops);
 859			if (IS_ERR(a)) {
 860				if (PTR_ERR(a) != -ENOENT)
 861					return PTR_ERR(a);
 862				continue;
 863			}
 864			attrs[aindex++] = a;
 865		}
 866	}
 867	return aindex;
 868}
 869
 870static struct attribute **
 871__hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
 872{
 873	int ret, i, aindex = 0, nattrs = 0;
 874	struct attribute **attrs;
 875
 876	for (i = 0; chip->info[i]; i++)
 877		nattrs += hwmon_num_channel_attrs(chip->info[i]);
 878
 879	if (nattrs == 0)
 880		return ERR_PTR(-EINVAL);
 881
 882	attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 883	if (!attrs)
 884		return ERR_PTR(-ENOMEM);
 885
 886	for (i = 0; chip->info[i]; i++) {
 887		ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
 888				     chip->info[i]);
 889		if (ret < 0) {
 890			hwmon_free_attrs(attrs);
 891			return ERR_PTR(ret);
 892		}
 893		aindex += ret;
 894	}
 895
 896	return attrs;
 897}
 898
 899static struct device *
 900__hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 901			const struct hwmon_chip_info *chip,
 902			const struct attribute_group **groups)
 903{
 904	struct hwmon_device *hwdev;
 905	const char *label;
 906	struct device *hdev;
 907	struct device *tdev = dev;
 908	int i, err, id;
 909
 910	/* Complain about invalid characters in hwmon name attribute */
 911	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 912		dev_warn(dev,
 913			 "hwmon: '%s' is not a valid name attribute, please fix\n",
 914			 name);
 915
 916	id = ida_alloc(&hwmon_ida, GFP_KERNEL);
 917	if (id < 0)
 918		return ERR_PTR(id);
 919
 920	hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 921	if (hwdev == NULL) {
 922		err = -ENOMEM;
 923		goto ida_remove;
 924	}
 925
 926	hdev = &hwdev->dev;
 927
 928	if (chip) {
 929		struct attribute **attrs;
 930		int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 931
 932		if (groups)
 933			for (i = 0; groups[i]; i++)
 934				ngroups++;
 935
 936		hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
 937		if (!hwdev->groups) {
 938			err = -ENOMEM;
 939			goto free_hwmon;
 940		}
 941
 942		attrs = __hwmon_create_attrs(drvdata, chip);
 943		if (IS_ERR(attrs)) {
 944			err = PTR_ERR(attrs);
 945			goto free_hwmon;
 946		}
 947
 948		hwdev->group.attrs = attrs;
 949		ngroups = 0;
 950		hwdev->groups[ngroups++] = &hwdev->group;
 951
 952		if (groups) {
 953			for (i = 0; groups[i]; i++)
 954				hwdev->groups[ngroups++] = groups[i];
 955		}
 956
 957		hdev->groups = hwdev->groups;
 958	} else {
 959		hdev->groups = groups;
 960	}
 961
 962	if (dev && device_property_present(dev, "label")) {
 963		err = device_property_read_string(dev, "label", &label);
 964		if (err < 0)
 965			goto free_hwmon;
 966
 967		hwdev->label = kstrdup(label, GFP_KERNEL);
 968		if (hwdev->label == NULL) {
 969			err = -ENOMEM;
 970			goto free_hwmon;
 971		}
 972	}
 973
 974	hwdev->name = name;
 975	hdev->class = &hwmon_class;
 976	hdev->parent = dev;
 977	while (tdev && !tdev->of_node)
 978		tdev = tdev->parent;
 979	hdev->of_node = tdev ? tdev->of_node : NULL;
 980	hwdev->chip = chip;
 981	mutex_init(&hwdev->lock);
 982	dev_set_drvdata(hdev, drvdata);
 983	dev_set_name(hdev, HWMON_ID_FORMAT, id);
 984	err = device_register(hdev);
 985	if (err) {
 986		put_device(hdev);
 987		goto ida_remove;
 988	}
 989
 990	INIT_LIST_HEAD(&hwdev->tzdata);
 991
 992	if (hdev->of_node && chip && chip->ops->read &&
 993	    chip->info[0]->type == hwmon_chip) {
 994		u32 config = chip->info[0]->config[0];
 995
 996		if (config & HWMON_C_REGISTER_TZ) {
 997			err = hwmon_thermal_register_sensors(hdev);
 998			if (err) {
 999				device_unregister(hdev);
1000				/*
1001				 * Don't worry about hwdev; hwmon_dev_release(),
1002				 * called from device_unregister(), will free it.
1003				 */
1004				goto ida_remove;
1005			}
1006		}
1007		if (config & HWMON_C_PEC) {
1008			err = hwmon_pec_register(hdev);
1009			if (err) {
1010				device_unregister(hdev);
1011				goto ida_remove;
1012			}
1013		}
1014	}
1015
1016	return hdev;
1017
1018free_hwmon:
1019	hwmon_dev_release(hdev);
1020ida_remove:
1021	ida_free(&hwmon_ida, id);
1022	return ERR_PTR(err);
1023}
1024
1025/**
1026 * hwmon_device_register_with_groups - register w/ hwmon
1027 * @dev: the parent device
1028 * @name: hwmon name attribute
1029 * @drvdata: driver data to attach to created device
1030 * @groups: List of attribute groups to create
1031 *
1032 * hwmon_device_unregister() must be called when the device is no
1033 * longer needed.
1034 *
1035 * Returns the pointer to the new device.
1036 */
1037struct device *
1038hwmon_device_register_with_groups(struct device *dev, const char *name,
1039				  void *drvdata,
1040				  const struct attribute_group **groups)
1041{
1042	if (!name)
1043		return ERR_PTR(-EINVAL);
1044
1045	return __hwmon_device_register(dev, name, drvdata, NULL, groups);
1046}
1047EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
1048
1049/**
1050 * hwmon_device_register_with_info - register w/ hwmon
1051 * @dev: the parent device (mandatory)
1052 * @name: hwmon name attribute (mandatory)
1053 * @drvdata: driver data to attach to created device (optional)
1054 * @chip: pointer to hwmon chip information (mandatory)
1055 * @extra_groups: pointer to list of additional non-standard attribute groups
1056 *	(optional)
1057 *
1058 * hwmon_device_unregister() must be called when the device is no
1059 * longer needed.
1060 *
1061 * Returns the pointer to the new device.
1062 */
1063struct device *
1064hwmon_device_register_with_info(struct device *dev, const char *name,
1065				void *drvdata,
1066				const struct hwmon_chip_info *chip,
1067				const struct attribute_group **extra_groups)
1068{
1069	if (!dev || !name || !chip)
1070		return ERR_PTR(-EINVAL);
1071
1072	if (!chip->ops || !(chip->ops->visible || chip->ops->is_visible) || !chip->info)
1073		return ERR_PTR(-EINVAL);
1074
1075	return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
1076}
1077EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
1078
1079/**
1080 * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem
1081 * @dev: the parent device
1082 * @name: hwmon name attribute
1083 * @drvdata: driver data to attach to created device
1084 *
1085 * The use of this function is restricted. It is provided for legacy reasons
1086 * and must only be called from the thermal subsystem.
1087 *
1088 * hwmon_device_unregister() must be called when the device is no
1089 * longer needed.
1090 *
1091 * Returns the pointer to the new device.
1092 */
1093struct device *
1094hwmon_device_register_for_thermal(struct device *dev, const char *name,
1095				  void *drvdata)
1096{
1097	if (!name || !dev)
1098		return ERR_PTR(-EINVAL);
1099
1100	return __hwmon_device_register(dev, name, drvdata, NULL, NULL);
1101}
1102EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, "HWMON_THERMAL");
1103
1104/**
1105 * hwmon_device_register - register w/ hwmon
1106 * @dev: the device to register
1107 *
1108 * hwmon_device_unregister() must be called when the device is no
1109 * longer needed.
1110 *
1111 * Returns the pointer to the new device.
1112 */
1113struct device *hwmon_device_register(struct device *dev)
1114{
1115	dev_warn(dev,
1116		 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
1117
1118	return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
1119}
1120EXPORT_SYMBOL_GPL(hwmon_device_register);
1121
1122/**
1123 * hwmon_device_unregister - removes the previously registered class device
1124 *
1125 * @dev: the class device to destroy
1126 */
1127void hwmon_device_unregister(struct device *dev)
1128{
1129	int id;
1130
1131	if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
1132		device_unregister(dev);
1133		ida_free(&hwmon_ida, id);
1134	} else
1135		dev_dbg(dev->parent,
1136			"hwmon_device_unregister() failed: bad class ID!\n");
1137}
1138EXPORT_SYMBOL_GPL(hwmon_device_unregister);
1139
1140static void devm_hwmon_release(struct device *dev, void *res)
1141{
1142	struct device *hwdev = *(struct device **)res;
1143
1144	hwmon_device_unregister(hwdev);
1145}
1146
1147/**
1148 * devm_hwmon_device_register_with_groups - register w/ hwmon
1149 * @dev: the parent device
1150 * @name: hwmon name attribute
1151 * @drvdata: driver data to attach to created device
1152 * @groups: List of attribute groups to create
1153 *
1154 * Returns the pointer to the new device. The new device is automatically
1155 * unregistered with the parent device.
1156 */
1157struct device *
1158devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
1159				       void *drvdata,
1160				       const struct attribute_group **groups)
1161{
1162	struct device **ptr, *hwdev;
1163
1164	if (!dev)
1165		return ERR_PTR(-EINVAL);
1166
1167	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1168	if (!ptr)
1169		return ERR_PTR(-ENOMEM);
1170
1171	hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
1172	if (IS_ERR(hwdev))
1173		goto error;
1174
1175	*ptr = hwdev;
1176	devres_add(dev, ptr);
1177	return hwdev;
1178
1179error:
1180	devres_free(ptr);
1181	return hwdev;
1182}
1183EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
1184
1185/**
1186 * devm_hwmon_device_register_with_info - register w/ hwmon
1187 * @dev:	the parent device
1188 * @name:	hwmon name attribute
1189 * @drvdata:	driver data to attach to created device
1190 * @chip:	pointer to hwmon chip information
1191 * @extra_groups: pointer to list of driver specific attribute groups
1192 *
1193 * Returns the pointer to the new device. The new device is automatically
1194 * unregistered with the parent device.
1195 */
1196struct device *
1197devm_hwmon_device_register_with_info(struct device *dev, const char *name,
1198				     void *drvdata,
1199				     const struct hwmon_chip_info *chip,
1200				     const struct attribute_group **extra_groups)
1201{
1202	struct device **ptr, *hwdev;
1203
1204	if (!dev)
1205		return ERR_PTR(-EINVAL);
1206
1207	if (!name) {
1208		name = devm_hwmon_sanitize_name(dev, dev_name(dev));
1209		if (IS_ERR(name))
1210			return ERR_CAST(name);
1211	}
1212
1213	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1214	if (!ptr)
1215		return ERR_PTR(-ENOMEM);
1216
1217	hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
1218						extra_groups);
1219	if (IS_ERR(hwdev))
1220		goto error;
1221
1222	*ptr = hwdev;
1223	devres_add(dev, ptr);
1224
1225	return hwdev;
1226
1227error:
1228	devres_free(ptr);
1229	return hwdev;
1230}
1231EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
1232
1233static char *__hwmon_sanitize_name(struct device *dev, const char *old_name)
1234{
1235	char *name, *p;
1236
1237	if (dev)
1238		name = devm_kstrdup(dev, old_name, GFP_KERNEL);
1239	else
1240		name = kstrdup(old_name, GFP_KERNEL);
1241	if (!name)
1242		return ERR_PTR(-ENOMEM);
1243
1244	for (p = name; *p; p++)
1245		if (hwmon_is_bad_char(*p))
1246			*p = '_';
1247
1248	return name;
1249}
1250
1251/**
1252 * hwmon_sanitize_name - Replaces invalid characters in a hwmon name
1253 * @name: NUL-terminated name
1254 *
1255 * Allocates a new string where any invalid characters will be replaced
1256 * by an underscore. It is the responsibility of the caller to release
1257 * the memory.
1258 *
1259 * Returns newly allocated name, or ERR_PTR on error.
1260 */
1261char *hwmon_sanitize_name(const char *name)
1262{
1263	return __hwmon_sanitize_name(NULL, name);
1264}
1265EXPORT_SYMBOL_GPL(hwmon_sanitize_name);
1266
1267/**
1268 * devm_hwmon_sanitize_name - resource managed hwmon_sanitize_name()
1269 * @dev: device to allocate memory for
1270 * @name: NUL-terminated name
1271 *
1272 * Allocates a new string where any invalid characters will be replaced
1273 * by an underscore.
1274 *
1275 * Returns newly allocated name, or ERR_PTR on error.
1276 */
1277char *devm_hwmon_sanitize_name(struct device *dev, const char *name)
1278{
1279	if (!dev)
1280		return ERR_PTR(-EINVAL);
1281
1282	return __hwmon_sanitize_name(dev, name);
1283}
1284EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name);
1285
1286static void __init hwmon_pci_quirks(void)
1287{
1288#if defined CONFIG_X86 && defined CONFIG_PCI
1289	struct pci_dev *sb;
1290	u16 base;
1291	u8 enable;
1292
1293	/* Open access to 0x295-0x296 on MSI MS-7031 */
1294	sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
1295	if (sb) {
1296		if (sb->subsystem_vendor == 0x1462 &&	/* MSI */
1297		    sb->subsystem_device == 0x0031) {	/* MS-7031 */
1298			pci_read_config_byte(sb, 0x48, &enable);
1299			pci_read_config_word(sb, 0x64, &base);
1300
1301			if (base == 0 && !(enable & BIT(2))) {
1302				dev_info(&sb->dev,
1303					 "Opening wide generic port at 0x295\n");
1304				pci_write_config_word(sb, 0x64, 0x295);
1305				pci_write_config_byte(sb, 0x48,
1306						      enable | BIT(2));
1307			}
1308		}
1309		pci_dev_put(sb);
1310	}
1311#endif
1312}
1313
1314static int __init hwmon_init(void)
1315{
1316	int err;
1317
1318	hwmon_pci_quirks();
1319
1320	err = class_register(&hwmon_class);
1321	if (err) {
1322		pr_err("couldn't register hwmon sysfs class\n");
1323		return err;
1324	}
1325	return 0;
1326}
1327
1328static void __exit hwmon_exit(void)
1329{
1330	class_unregister(&hwmon_class);
1331}
1332
1333subsys_initcall(hwmon_init);
1334module_exit(hwmon_exit);
1335
1336MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1337MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1338MODULE_LICENSE("GPL");
1339