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/idr.h>
  18#include <linux/list.h>
  19#include <linux/module.h>
 
  20#include <linux/pci.h>
  21#include <linux/slab.h>
  22#include <linux/string.h>
  23#include <linux/thermal.h>
  24
  25#define CREATE_TRACE_POINTS
  26#include <trace/events/hwmon.h>
  27
  28#define HWMON_ID_PREFIX "hwmon"
  29#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  30
  31struct hwmon_device {
  32	const char *name;
  33	struct device dev;
  34	const struct hwmon_chip_info *chip;
  35	struct list_head tzdata;
  36	struct attribute_group group;
  37	const struct attribute_group **groups;
  38};
  39
  40#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
  41
  42#define MAX_SYSFS_ATTR_NAME_LENGTH	32
  43
  44struct hwmon_device_attribute {
  45	struct device_attribute dev_attr;
  46	const struct hwmon_ops *ops;
  47	enum hwmon_sensor_types type;
  48	u32 attr;
  49	int index;
  50	char name[MAX_SYSFS_ATTR_NAME_LENGTH];
  51};
  52
  53#define to_hwmon_attr(d) \
  54	container_of(d, struct hwmon_device_attribute, dev_attr)
  55#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
  56
  57/*
  58 * Thermal zone information
  59 */
  60struct hwmon_thermal_data {
  61	struct list_head node;		/* hwmon tzdata list entry */
  62	struct device *dev;		/* Reference to hwmon device */
  63	int index;			/* sensor index */
  64	struct thermal_zone_device *tzd;/* thermal zone device */
  65};
  66
  67static ssize_t
  68name_show(struct device *dev, struct device_attribute *attr, char *buf)
  69{
  70	return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  71}
  72static DEVICE_ATTR_RO(name);
  73
  74static struct attribute *hwmon_dev_attrs[] = {
  75	&dev_attr_name.attr,
  76	NULL
  77};
  78
  79static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
  80					 struct attribute *attr, int n)
  81{
  82	struct device *dev = container_of(kobj, struct device, kobj);
  83
  84	if (to_hwmon_device(dev)->name == NULL)
  85		return 0;
  86
  87	return attr->mode;
  88}
  89
  90static const struct attribute_group hwmon_dev_attr_group = {
  91	.attrs		= hwmon_dev_attrs,
  92	.is_visible	= hwmon_dev_name_is_visible,
  93};
  94
  95static const struct attribute_group *hwmon_dev_attr_groups[] = {
  96	&hwmon_dev_attr_group,
  97	NULL
  98};
  99
 100static void hwmon_free_attrs(struct attribute **attrs)
 101{
 102	int i;
 103
 104	for (i = 0; attrs[i]; i++) {
 105		struct device_attribute *dattr = to_dev_attr(attrs[i]);
 106		struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
 107
 108		kfree(hattr);
 109	}
 110	kfree(attrs);
 111}
 112
 113static void hwmon_dev_release(struct device *dev)
 114{
 115	struct hwmon_device *hwdev = to_hwmon_device(dev);
 116
 117	if (hwdev->group.attrs)
 118		hwmon_free_attrs(hwdev->group.attrs);
 119	kfree(hwdev->groups);
 120	kfree(hwdev);
 121}
 122
 123static struct class hwmon_class = {
 124	.name = "hwmon",
 125	.owner = THIS_MODULE,
 126	.dev_groups = hwmon_dev_attr_groups,
 127	.dev_release = hwmon_dev_release,
 128};
 129
 130static DEFINE_IDA(hwmon_ida);
 131
 132/* Thermal zone handling */
 133
 134/*
 135 * The complex conditional is necessary to avoid a cyclic dependency
 136 * between hwmon and thermal_sys modules.
 137 */
 138#ifdef CONFIG_THERMAL_OF
 139static int hwmon_thermal_get_temp(void *data, int *temp)
 140{
 141	struct hwmon_thermal_data *tdata = data;
 142	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 143	int ret;
 144	long t;
 145
 146	ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
 147				     tdata->index, &t);
 148	if (ret < 0)
 149		return ret;
 150
 151	*temp = t;
 152
 153	return 0;
 154}
 155
 156static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 157	.get_temp = hwmon_thermal_get_temp,
 158};
 159
 160static void hwmon_thermal_remove_sensor(void *data)
 161{
 162	list_del(data);
 163}
 164
 165static int hwmon_thermal_add_sensor(struct device *dev, int index)
 166{
 167	struct hwmon_device *hwdev = to_hwmon_device(dev);
 168	struct hwmon_thermal_data *tdata;
 169	struct thermal_zone_device *tzd;
 170	int err;
 171
 172	tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 173	if (!tdata)
 174		return -ENOMEM;
 175
 176	tdata->dev = dev;
 177	tdata->index = index;
 178
 179	tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
 180						   &hwmon_thermal_ops);
 181	/*
 182	 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
 183	 * so ignore that error but forward any other error.
 184	 */
 185	if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
 186		return PTR_ERR(tzd);
 187
 188	err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
 189	if (err)
 190		return err;
 191
 192	tdata->tzd = tzd;
 193	list_add(&tdata->node, &hwdev->tzdata);
 194
 195	return 0;
 196}
 197
 198static int hwmon_thermal_register_sensors(struct device *dev)
 199{
 200	struct hwmon_device *hwdev = to_hwmon_device(dev);
 201	const struct hwmon_chip_info *chip = hwdev->chip;
 202	const struct hwmon_channel_info **info = chip->info;
 203	void *drvdata = dev_get_drvdata(dev);
 204	int i;
 205
 206	for (i = 1; info[i]; i++) {
 207		int j;
 208
 209		if (info[i]->type != hwmon_temp)
 210			continue;
 211
 212		for (j = 0; info[i]->config[j]; j++) {
 213			int err;
 214
 215			if (!(info[i]->config[j] & HWMON_T_INPUT) ||
 216			    !chip->ops->is_visible(drvdata, hwmon_temp,
 217						   hwmon_temp_input, j))
 218				continue;
 219
 220			err = hwmon_thermal_add_sensor(dev, j);
 221			if (err)
 222				return err;
 223		}
 224	}
 225
 226	return 0;
 227}
 228
 229static void hwmon_thermal_notify(struct device *dev, int index)
 230{
 231	struct hwmon_device *hwdev = to_hwmon_device(dev);
 232	struct hwmon_thermal_data *tzdata;
 233
 234	list_for_each_entry(tzdata, &hwdev->tzdata, node) {
 235		if (tzdata->index == index) {
 236			thermal_zone_device_update(tzdata->tzd,
 237						   THERMAL_EVENT_UNSPECIFIED);
 238		}
 239	}
 240}
 241
 242#else
 243static int hwmon_thermal_register_sensors(struct device *dev)
 244{
 245	return 0;
 246}
 247
 248static void hwmon_thermal_notify(struct device *dev, int index) { }
 249
 250#endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 251
 252static int hwmon_attr_base(enum hwmon_sensor_types type)
 253{
 254	if (type == hwmon_in || type == hwmon_intrusion)
 255		return 0;
 256	return 1;
 257}
 258
 259/* sysfs attribute management */
 260
 261static ssize_t hwmon_attr_show(struct device *dev,
 262			       struct device_attribute *devattr, char *buf)
 263{
 264	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 265	long val;
 266	int ret;
 267
 268	ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 269			       &val);
 270	if (ret < 0)
 271		return ret;
 272
 273	trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
 274			      hattr->name, val);
 275
 276	return sprintf(buf, "%ld\n", val);
 277}
 278
 279static ssize_t hwmon_attr_show_string(struct device *dev,
 280				      struct device_attribute *devattr,
 281				      char *buf)
 282{
 283	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 284	enum hwmon_sensor_types type = hattr->type;
 285	const char *s;
 286	int ret;
 287
 288	ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 289				      hattr->index, &s);
 290	if (ret < 0)
 291		return ret;
 292
 293	trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
 294				     hattr->name, s);
 295
 296	return sprintf(buf, "%s\n", s);
 297}
 298
 299static ssize_t hwmon_attr_store(struct device *dev,
 300				struct device_attribute *devattr,
 301				const char *buf, size_t count)
 302{
 303	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 304	long val;
 305	int ret;
 306
 307	ret = kstrtol(buf, 10, &val);
 308	if (ret < 0)
 309		return ret;
 310
 311	ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 312				val);
 313	if (ret < 0)
 314		return ret;
 315
 316	trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
 317			       hattr->name, val);
 318
 319	return count;
 320}
 321
 322static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 323{
 324	return (type == hwmon_temp && attr == hwmon_temp_label) ||
 325	       (type == hwmon_in && attr == hwmon_in_label) ||
 326	       (type == hwmon_curr && attr == hwmon_curr_label) ||
 327	       (type == hwmon_power && attr == hwmon_power_label) ||
 328	       (type == hwmon_energy && attr == hwmon_energy_label) ||
 329	       (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 330	       (type == hwmon_fan && attr == hwmon_fan_label);
 331}
 332
 333static struct attribute *hwmon_genattr(const void *drvdata,
 334				       enum hwmon_sensor_types type,
 335				       u32 attr,
 336				       int index,
 337				       const char *template,
 338				       const struct hwmon_ops *ops)
 339{
 340	struct hwmon_device_attribute *hattr;
 341	struct device_attribute *dattr;
 342	struct attribute *a;
 343	umode_t mode;
 344	const char *name;
 345	bool is_string = is_string_attr(type, attr);
 346
 347	/* The attribute is invisible if there is no template string */
 348	if (!template)
 349		return ERR_PTR(-ENOENT);
 350
 351	mode = ops->is_visible(drvdata, type, attr, index);
 352	if (!mode)
 353		return ERR_PTR(-ENOENT);
 354
 355	if ((mode & 0444) && ((is_string && !ops->read_string) ||
 356				 (!is_string && !ops->read)))
 357		return ERR_PTR(-EINVAL);
 358	if ((mode & 0222) && !ops->write)
 359		return ERR_PTR(-EINVAL);
 360
 361	hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
 362	if (!hattr)
 363		return ERR_PTR(-ENOMEM);
 364
 365	if (type == hwmon_chip) {
 366		name = template;
 367	} else {
 368		scnprintf(hattr->name, sizeof(hattr->name), template,
 369			  index + hwmon_attr_base(type));
 370		name = hattr->name;
 371	}
 372
 373	hattr->type = type;
 374	hattr->attr = attr;
 375	hattr->index = index;
 376	hattr->ops = ops;
 377
 378	dattr = &hattr->dev_attr;
 379	dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 380	dattr->store = hwmon_attr_store;
 381
 382	a = &dattr->attr;
 383	sysfs_attr_init(a);
 384	a->name = name;
 385	a->mode = mode;
 386
 387	return a;
 388}
 389
 390/*
 391 * Chip attributes are not attribute templates but actual sysfs attributes.
 392 * See hwmon_genattr() for special handling.
 393 */
 394static const char * const hwmon_chip_attrs[] = {
 395	[hwmon_chip_temp_reset_history] = "temp_reset_history",
 396	[hwmon_chip_in_reset_history] = "in_reset_history",
 397	[hwmon_chip_curr_reset_history] = "curr_reset_history",
 398	[hwmon_chip_power_reset_history] = "power_reset_history",
 399	[hwmon_chip_update_interval] = "update_interval",
 400	[hwmon_chip_alarms] = "alarms",
 401	[hwmon_chip_samples] = "samples",
 402	[hwmon_chip_curr_samples] = "curr_samples",
 403	[hwmon_chip_in_samples] = "in_samples",
 404	[hwmon_chip_power_samples] = "power_samples",
 405	[hwmon_chip_temp_samples] = "temp_samples",
 406};
 407
 408static const char * const hwmon_temp_attr_templates[] = {
 409	[hwmon_temp_enable] = "temp%d_enable",
 410	[hwmon_temp_input] = "temp%d_input",
 411	[hwmon_temp_type] = "temp%d_type",
 412	[hwmon_temp_lcrit] = "temp%d_lcrit",
 413	[hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 414	[hwmon_temp_min] = "temp%d_min",
 415	[hwmon_temp_min_hyst] = "temp%d_min_hyst",
 416	[hwmon_temp_max] = "temp%d_max",
 417	[hwmon_temp_max_hyst] = "temp%d_max_hyst",
 418	[hwmon_temp_crit] = "temp%d_crit",
 419	[hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 420	[hwmon_temp_emergency] = "temp%d_emergency",
 421	[hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 422	[hwmon_temp_alarm] = "temp%d_alarm",
 423	[hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 424	[hwmon_temp_min_alarm] = "temp%d_min_alarm",
 425	[hwmon_temp_max_alarm] = "temp%d_max_alarm",
 426	[hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 427	[hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 428	[hwmon_temp_fault] = "temp%d_fault",
 429	[hwmon_temp_offset] = "temp%d_offset",
 430	[hwmon_temp_label] = "temp%d_label",
 431	[hwmon_temp_lowest] = "temp%d_lowest",
 432	[hwmon_temp_highest] = "temp%d_highest",
 433	[hwmon_temp_reset_history] = "temp%d_reset_history",
 434};
 435
 436static const char * const hwmon_in_attr_templates[] = {
 437	[hwmon_in_enable] = "in%d_enable",
 438	[hwmon_in_input] = "in%d_input",
 439	[hwmon_in_min] = "in%d_min",
 440	[hwmon_in_max] = "in%d_max",
 441	[hwmon_in_lcrit] = "in%d_lcrit",
 442	[hwmon_in_crit] = "in%d_crit",
 443	[hwmon_in_average] = "in%d_average",
 444	[hwmon_in_lowest] = "in%d_lowest",
 445	[hwmon_in_highest] = "in%d_highest",
 446	[hwmon_in_reset_history] = "in%d_reset_history",
 447	[hwmon_in_label] = "in%d_label",
 448	[hwmon_in_alarm] = "in%d_alarm",
 449	[hwmon_in_min_alarm] = "in%d_min_alarm",
 450	[hwmon_in_max_alarm] = "in%d_max_alarm",
 451	[hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 452	[hwmon_in_crit_alarm] = "in%d_crit_alarm",
 453};
 454
 455static const char * const hwmon_curr_attr_templates[] = {
 456	[hwmon_curr_enable] = "curr%d_enable",
 457	[hwmon_curr_input] = "curr%d_input",
 458	[hwmon_curr_min] = "curr%d_min",
 459	[hwmon_curr_max] = "curr%d_max",
 460	[hwmon_curr_lcrit] = "curr%d_lcrit",
 461	[hwmon_curr_crit] = "curr%d_crit",
 462	[hwmon_curr_average] = "curr%d_average",
 463	[hwmon_curr_lowest] = "curr%d_lowest",
 464	[hwmon_curr_highest] = "curr%d_highest",
 465	[hwmon_curr_reset_history] = "curr%d_reset_history",
 466	[hwmon_curr_label] = "curr%d_label",
 467	[hwmon_curr_alarm] = "curr%d_alarm",
 468	[hwmon_curr_min_alarm] = "curr%d_min_alarm",
 469	[hwmon_curr_max_alarm] = "curr%d_max_alarm",
 470	[hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 471	[hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 472};
 473
 474static const char * const hwmon_power_attr_templates[] = {
 475	[hwmon_power_enable] = "power%d_enable",
 476	[hwmon_power_average] = "power%d_average",
 477	[hwmon_power_average_interval] = "power%d_average_interval",
 478	[hwmon_power_average_interval_max] = "power%d_interval_max",
 479	[hwmon_power_average_interval_min] = "power%d_interval_min",
 480	[hwmon_power_average_highest] = "power%d_average_highest",
 481	[hwmon_power_average_lowest] = "power%d_average_lowest",
 482	[hwmon_power_average_max] = "power%d_average_max",
 483	[hwmon_power_average_min] = "power%d_average_min",
 484	[hwmon_power_input] = "power%d_input",
 485	[hwmon_power_input_highest] = "power%d_input_highest",
 486	[hwmon_power_input_lowest] = "power%d_input_lowest",
 487	[hwmon_power_reset_history] = "power%d_reset_history",
 488	[hwmon_power_accuracy] = "power%d_accuracy",
 489	[hwmon_power_cap] = "power%d_cap",
 490	[hwmon_power_cap_hyst] = "power%d_cap_hyst",
 491	[hwmon_power_cap_max] = "power%d_cap_max",
 492	[hwmon_power_cap_min] = "power%d_cap_min",
 493	[hwmon_power_min] = "power%d_min",
 494	[hwmon_power_max] = "power%d_max",
 495	[hwmon_power_lcrit] = "power%d_lcrit",
 496	[hwmon_power_crit] = "power%d_crit",
 497	[hwmon_power_label] = "power%d_label",
 498	[hwmon_power_alarm] = "power%d_alarm",
 499	[hwmon_power_cap_alarm] = "power%d_cap_alarm",
 500	[hwmon_power_min_alarm] = "power%d_min_alarm",
 501	[hwmon_power_max_alarm] = "power%d_max_alarm",
 502	[hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
 503	[hwmon_power_crit_alarm] = "power%d_crit_alarm",
 504};
 505
 506static const char * const hwmon_energy_attr_templates[] = {
 507	[hwmon_energy_enable] = "energy%d_enable",
 508	[hwmon_energy_input] = "energy%d_input",
 509	[hwmon_energy_label] = "energy%d_label",
 510};
 511
 512static const char * const hwmon_humidity_attr_templates[] = {
 513	[hwmon_humidity_enable] = "humidity%d_enable",
 514	[hwmon_humidity_input] = "humidity%d_input",
 515	[hwmon_humidity_label] = "humidity%d_label",
 516	[hwmon_humidity_min] = "humidity%d_min",
 517	[hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 518	[hwmon_humidity_max] = "humidity%d_max",
 519	[hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 520	[hwmon_humidity_alarm] = "humidity%d_alarm",
 521	[hwmon_humidity_fault] = "humidity%d_fault",
 522};
 523
 524static const char * const hwmon_fan_attr_templates[] = {
 525	[hwmon_fan_enable] = "fan%d_enable",
 526	[hwmon_fan_input] = "fan%d_input",
 527	[hwmon_fan_label] = "fan%d_label",
 528	[hwmon_fan_min] = "fan%d_min",
 529	[hwmon_fan_max] = "fan%d_max",
 530	[hwmon_fan_div] = "fan%d_div",
 531	[hwmon_fan_pulses] = "fan%d_pulses",
 532	[hwmon_fan_target] = "fan%d_target",
 533	[hwmon_fan_alarm] = "fan%d_alarm",
 534	[hwmon_fan_min_alarm] = "fan%d_min_alarm",
 535	[hwmon_fan_max_alarm] = "fan%d_max_alarm",
 536	[hwmon_fan_fault] = "fan%d_fault",
 537};
 538
 539static const char * const hwmon_pwm_attr_templates[] = {
 540	[hwmon_pwm_input] = "pwm%d",
 541	[hwmon_pwm_enable] = "pwm%d_enable",
 542	[hwmon_pwm_mode] = "pwm%d_mode",
 543	[hwmon_pwm_freq] = "pwm%d_freq",
 544};
 545
 546static const char * const hwmon_intrusion_attr_templates[] = {
 547	[hwmon_intrusion_alarm] = "intrusion%d_alarm",
 548	[hwmon_intrusion_beep]  = "intrusion%d_beep",
 549};
 550
 551static const char * const *__templates[] = {
 552	[hwmon_chip] = hwmon_chip_attrs,
 553	[hwmon_temp] = hwmon_temp_attr_templates,
 554	[hwmon_in] = hwmon_in_attr_templates,
 555	[hwmon_curr] = hwmon_curr_attr_templates,
 556	[hwmon_power] = hwmon_power_attr_templates,
 557	[hwmon_energy] = hwmon_energy_attr_templates,
 558	[hwmon_humidity] = hwmon_humidity_attr_templates,
 559	[hwmon_fan] = hwmon_fan_attr_templates,
 560	[hwmon_pwm] = hwmon_pwm_attr_templates,
 561	[hwmon_intrusion] = hwmon_intrusion_attr_templates,
 562};
 563
 564static const int __templates_size[] = {
 565	[hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 566	[hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 567	[hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 568	[hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 569	[hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 570	[hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 571	[hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 572	[hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 573	[hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 574	[hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
 575};
 576
 577int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
 578		       u32 attr, int channel)
 579{
 580	char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
 581	const char * const *templates;
 582	const char *template;
 583	int base;
 584
 585	if (type >= ARRAY_SIZE(__templates))
 586		return -EINVAL;
 587	if (attr >= __templates_size[type])
 588		return -EINVAL;
 589
 590	templates = __templates[type];
 591	template = templates[attr];
 592
 593	base = hwmon_attr_base(type);
 594
 595	scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
 596	sysfs_notify(&dev->kobj, NULL, sattr);
 597	kobject_uevent(&dev->kobj, KOBJ_CHANGE);
 598
 599	if (type == hwmon_temp)
 600		hwmon_thermal_notify(dev, channel);
 601
 602	return 0;
 603}
 604EXPORT_SYMBOL_GPL(hwmon_notify_event);
 605
 606static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 607{
 608	int i, n;
 609
 610	for (i = n = 0; info->config[i]; i++)
 611		n += hweight32(info->config[i]);
 612
 613	return n;
 614}
 615
 616static int hwmon_genattrs(const void *drvdata,
 617			  struct attribute **attrs,
 618			  const struct hwmon_ops *ops,
 619			  const struct hwmon_channel_info *info)
 620{
 621	const char * const *templates;
 622	int template_size;
 623	int i, aindex = 0;
 624
 625	if (info->type >= ARRAY_SIZE(__templates))
 626		return -EINVAL;
 627
 628	templates = __templates[info->type];
 629	template_size = __templates_size[info->type];
 630
 631	for (i = 0; info->config[i]; i++) {
 632		u32 attr_mask = info->config[i];
 633		u32 attr;
 634
 635		while (attr_mask) {
 636			struct attribute *a;
 637
 638			attr = __ffs(attr_mask);
 639			attr_mask &= ~BIT(attr);
 640			if (attr >= template_size)
 641				return -EINVAL;
 642			a = hwmon_genattr(drvdata, info->type, attr, i,
 643					  templates[attr], ops);
 644			if (IS_ERR(a)) {
 645				if (PTR_ERR(a) != -ENOENT)
 646					return PTR_ERR(a);
 647				continue;
 648			}
 649			attrs[aindex++] = a;
 650		}
 651	}
 652	return aindex;
 653}
 654
 655static struct attribute **
 656__hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
 657{
 658	int ret, i, aindex = 0, nattrs = 0;
 659	struct attribute **attrs;
 660
 661	for (i = 0; chip->info[i]; i++)
 662		nattrs += hwmon_num_channel_attrs(chip->info[i]);
 663
 664	if (nattrs == 0)
 665		return ERR_PTR(-EINVAL);
 666
 667	attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 668	if (!attrs)
 669		return ERR_PTR(-ENOMEM);
 670
 671	for (i = 0; chip->info[i]; i++) {
 672		ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
 673				     chip->info[i]);
 674		if (ret < 0) {
 675			hwmon_free_attrs(attrs);
 676			return ERR_PTR(ret);
 677		}
 678		aindex += ret;
 679	}
 680
 681	return attrs;
 682}
 683
 684static struct device *
 685__hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 686			const struct hwmon_chip_info *chip,
 687			const struct attribute_group **groups)
 688{
 689	struct hwmon_device *hwdev;
 690	struct device *hdev;
 691	int i, err, id;
 692
 693	/* Complain about invalid characters in hwmon name attribute */
 694	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 695		dev_warn(dev,
 696			 "hwmon: '%s' is not a valid name attribute, please fix\n",
 697			 name);
 698
 699	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 700	if (id < 0)
 701		return ERR_PTR(id);
 702
 703	hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 704	if (hwdev == NULL) {
 705		err = -ENOMEM;
 706		goto ida_remove;
 707	}
 708
 709	hdev = &hwdev->dev;
 710
 711	if (chip) {
 712		struct attribute **attrs;
 713		int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 714
 715		if (groups)
 716			for (i = 0; groups[i]; i++)
 717				ngroups++;
 718
 719		hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
 720		if (!hwdev->groups) {
 721			err = -ENOMEM;
 722			goto free_hwmon;
 723		}
 724
 725		attrs = __hwmon_create_attrs(drvdata, chip);
 726		if (IS_ERR(attrs)) {
 727			err = PTR_ERR(attrs);
 728			goto free_hwmon;
 729		}
 730
 731		hwdev->group.attrs = attrs;
 732		ngroups = 0;
 733		hwdev->groups[ngroups++] = &hwdev->group;
 734
 735		if (groups) {
 736			for (i = 0; groups[i]; i++)
 737				hwdev->groups[ngroups++] = groups[i];
 738		}
 739
 740		hdev->groups = hwdev->groups;
 741	} else {
 742		hdev->groups = groups;
 743	}
 744
 745	hwdev->name = name;
 746	hdev->class = &hwmon_class;
 747	hdev->parent = dev;
 748	hdev->of_node = dev ? dev->of_node : NULL;
 749	hwdev->chip = chip;
 750	dev_set_drvdata(hdev, drvdata);
 751	dev_set_name(hdev, HWMON_ID_FORMAT, id);
 752	err = device_register(hdev);
 753	if (err)
 754		goto free_hwmon;
 755
 756	INIT_LIST_HEAD(&hwdev->tzdata);
 757
 758	if (dev && dev->of_node && chip && chip->ops->read &&
 759	    chip->info[0]->type == hwmon_chip &&
 760	    (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 761		err = hwmon_thermal_register_sensors(hdev);
 762		if (err) {
 763			device_unregister(hdev);
 764			/*
 765			 * Don't worry about hwdev; hwmon_dev_release(), called
 766			 * from device_unregister(), will free it.
 767			 */
 768			goto ida_remove;
 769		}
 770	}
 771
 772	return hdev;
 773
 774free_hwmon:
 775	hwmon_dev_release(hdev);
 776ida_remove:
 777	ida_simple_remove(&hwmon_ida, id);
 778	return ERR_PTR(err);
 779}
 780
 781/**
 782 * hwmon_device_register_with_groups - register w/ hwmon
 783 * @dev: the parent device
 784 * @name: hwmon name attribute
 785 * @drvdata: driver data to attach to created device
 786 * @groups: List of attribute groups to create
 787 *
 788 * hwmon_device_unregister() must be called when the device is no
 789 * longer needed.
 790 *
 791 * Returns the pointer to the new device.
 792 */
 793struct device *
 794hwmon_device_register_with_groups(struct device *dev, const char *name,
 795				  void *drvdata,
 796				  const struct attribute_group **groups)
 797{
 798	if (!name)
 799		return ERR_PTR(-EINVAL);
 800
 801	return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 802}
 803EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 804
 805/**
 806 * hwmon_device_register_with_info - register w/ hwmon
 807 * @dev: the parent device
 808 * @name: hwmon name attribute
 809 * @drvdata: driver data to attach to created device
 810 * @chip: pointer to hwmon chip information
 811 * @extra_groups: pointer to list of additional non-standard attribute groups
 812 *
 813 * hwmon_device_unregister() must be called when the device is no
 814 * longer needed.
 815 *
 816 * Returns the pointer to the new device.
 817 */
 818struct device *
 819hwmon_device_register_with_info(struct device *dev, const char *name,
 820				void *drvdata,
 821				const struct hwmon_chip_info *chip,
 822				const struct attribute_group **extra_groups)
 823{
 824	if (!name)
 825		return ERR_PTR(-EINVAL);
 826
 827	if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
 828		return ERR_PTR(-EINVAL);
 829
 830	if (chip && !dev)
 831		return ERR_PTR(-EINVAL);
 832
 833	return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
 834}
 835EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 836
 837/**
 838 * hwmon_device_register - register w/ hwmon
 839 * @dev: the device to register
 840 *
 841 * hwmon_device_unregister() must be called when the device is no
 842 * longer needed.
 843 *
 844 * Returns the pointer to the new device.
 845 */
 846struct device *hwmon_device_register(struct device *dev)
 847{
 848	dev_warn(dev,
 849		 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 850
 851	return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
 852}
 853EXPORT_SYMBOL_GPL(hwmon_device_register);
 854
 855/**
 856 * hwmon_device_unregister - removes the previously registered class device
 857 *
 858 * @dev: the class device to destroy
 859 */
 860void hwmon_device_unregister(struct device *dev)
 861{
 862	int id;
 863
 864	if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 865		device_unregister(dev);
 866		ida_simple_remove(&hwmon_ida, id);
 867	} else
 868		dev_dbg(dev->parent,
 869			"hwmon_device_unregister() failed: bad class ID!\n");
 870}
 871EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 872
 873static void devm_hwmon_release(struct device *dev, void *res)
 874{
 875	struct device *hwdev = *(struct device **)res;
 876
 877	hwmon_device_unregister(hwdev);
 878}
 879
 880/**
 881 * devm_hwmon_device_register_with_groups - register w/ hwmon
 882 * @dev: the parent device
 883 * @name: hwmon name attribute
 884 * @drvdata: driver data to attach to created device
 885 * @groups: List of attribute groups to create
 886 *
 887 * Returns the pointer to the new device. The new device is automatically
 888 * unregistered with the parent device.
 889 */
 890struct device *
 891devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 892				       void *drvdata,
 893				       const struct attribute_group **groups)
 894{
 895	struct device **ptr, *hwdev;
 896
 897	if (!dev)
 898		return ERR_PTR(-EINVAL);
 899
 900	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 901	if (!ptr)
 902		return ERR_PTR(-ENOMEM);
 903
 904	hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 905	if (IS_ERR(hwdev))
 906		goto error;
 907
 908	*ptr = hwdev;
 909	devres_add(dev, ptr);
 910	return hwdev;
 911
 912error:
 913	devres_free(ptr);
 914	return hwdev;
 915}
 916EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 917
 918/**
 919 * devm_hwmon_device_register_with_info - register w/ hwmon
 920 * @dev:	the parent device
 921 * @name:	hwmon name attribute
 922 * @drvdata:	driver data to attach to created device
 923 * @chip:	pointer to hwmon chip information
 924 * @groups:	pointer to list of driver specific attribute groups
 925 *
 926 * Returns the pointer to the new device. The new device is automatically
 927 * unregistered with the parent device.
 928 */
 929struct device *
 930devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 931				     void *drvdata,
 932				     const struct hwmon_chip_info *chip,
 933				     const struct attribute_group **groups)
 934{
 935	struct device **ptr, *hwdev;
 936
 937	if (!dev)
 938		return ERR_PTR(-EINVAL);
 939
 940	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 941	if (!ptr)
 942		return ERR_PTR(-ENOMEM);
 943
 944	hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
 945						groups);
 946	if (IS_ERR(hwdev))
 947		goto error;
 948
 949	*ptr = hwdev;
 950	devres_add(dev, ptr);
 951
 952	return hwdev;
 953
 954error:
 955	devres_free(ptr);
 956	return hwdev;
 957}
 958EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 959
 960static int devm_hwmon_match(struct device *dev, void *res, void *data)
 961{
 962	struct device **hwdev = res;
 963
 964	return *hwdev == data;
 965}
 966
 967/**
 968 * devm_hwmon_device_unregister - removes a previously registered hwmon device
 969 *
 970 * @dev: the parent device of the device to unregister
 971 */
 972void devm_hwmon_device_unregister(struct device *dev)
 973{
 974	WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 975}
 976EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 977
 978static void __init hwmon_pci_quirks(void)
 979{
 980#if defined CONFIG_X86 && defined CONFIG_PCI
 981	struct pci_dev *sb;
 982	u16 base;
 983	u8 enable;
 984
 985	/* Open access to 0x295-0x296 on MSI MS-7031 */
 986	sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 987	if (sb) {
 988		if (sb->subsystem_vendor == 0x1462 &&	/* MSI */
 989		    sb->subsystem_device == 0x0031) {	/* MS-7031 */
 990			pci_read_config_byte(sb, 0x48, &enable);
 991			pci_read_config_word(sb, 0x64, &base);
 992
 993			if (base == 0 && !(enable & BIT(2))) {
 994				dev_info(&sb->dev,
 995					 "Opening wide generic port at 0x295\n");
 996				pci_write_config_word(sb, 0x64, 0x295);
 997				pci_write_config_byte(sb, 0x48,
 998						      enable | BIT(2));
 999			}
1000		}
1001		pci_dev_put(sb);
1002	}
1003#endif
1004}
1005
1006static int __init hwmon_init(void)
1007{
1008	int err;
1009
1010	hwmon_pci_quirks();
1011
1012	err = class_register(&hwmon_class);
1013	if (err) {
1014		pr_err("couldn't register hwmon sysfs class\n");
1015		return err;
1016	}
1017	return 0;
1018}
1019
1020static void __exit hwmon_exit(void)
1021{
1022	class_unregister(&hwmon_class);
1023}
1024
1025subsys_initcall(hwmon_init);
1026module_exit(hwmon_exit);
1027
1028MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1029MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1030MODULE_LICENSE("GPL");
1031