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, fmt: "%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, fmt: "%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(objp: hattr);
127 }
128 kfree(objp: 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(attrs: hwdev->group.attrs);
137 kfree(objp: hwdev->groups);
138 kfree(objp: hwdev->label);
139 kfree(objp: 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(tzd: tz);
166 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
167 int ret;
168 long t;
169
170 guard(mutex)(T: &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(tzd: 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)(T: &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(entry: 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, size: 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, id: index, data: tdata,
244 ops: &hwmon_thermal_ops);
245 if (IS_ERR(ptr: tzd)) {
246 if (PTR_ERR(ptr: tzd) != -ENODEV)
247 return PTR_ERR(ptr: tzd);
248 dev_info(dev, "temp%d_input not attached to any thermal zone\n",
249 index + 1);
250 devm_kfree(dev, p: 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(new: &tdata->node, head: &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(ops: chip->ops, drvdata, type: hwmon_temp,
286 attr: hwmon_temp_input, channel: j))
287 continue;
288
289 err = hwmon_thermal_add_sensor(dev, index: 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, fmt: "%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(s: buf, res: &val);
362 if (err < 0)
363 return err;
364
365 hdev = device_find_child(parent: dev, NULL, match: 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)(T: &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(dev: 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, attr: &dev_attr_pec);
398}
399
400static int hwmon_pec_register(struct device *hdev)
401{
402 struct i2c_client *client = i2c_verify_client(dev: hdev->parent);
403 int err;
404
405 if (!client)
406 return -EINVAL;
407
408 if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_SMBUS_PEC))
409 return 0;
410
411 err = device_create_file(device: &client->dev, entry: &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)(T: &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(index: hattr->index + hwmon_attr_base(type: hattr->type),
447 attr_name: hattr->name, val: val64);
448
449 return sprintf(buf, fmt: "%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)(T: &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(index: hattr->index + hwmon_attr_base(type),
470 attr_name: hattr->name, s);
471
472 return sprintf(buf, fmt: "%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(s: buf, base: 10, res: &val);
485 if (ret < 0)
486 return ret;
487
488 guard(mutex)(T: &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(index: hattr->index + hwmon_attr_base(type: hattr->type),
496 attr_name: hattr->name, val: (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, channel: index);
527 if (!mode)
528 return ERR_PTR(error: -ENOENT);
529
530 if ((mode & 0444) && ((is_string && !ops->read_string) ||
531 (!is_string && !ops->read)))
532 return ERR_PTR(error: -EINVAL);
533 if ((mode & 0222) && !ops->write)
534 return ERR_PTR(error: -EINVAL);
535
536 hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
537 if (!hattr)
538 return ERR_PTR(error: -ENOMEM);
539
540 if (type == hwmon_chip) {
541 name = template;
542 } else {
543 scnprintf(buf: hattr->name, size: sizeof(hattr->name), fmt: 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(buf: sattr, MAX_SYSFS_ATTR_NAME_LENGTH, fmt: template, base + channel);
794 scnprintf(buf: event, size: sizeof(event), fmt: "NAME=%s", sattr);
795 sysfs_notify(kobj: &dev->kobj, NULL, attr: sattr);
796 kobject_uevent_env(kobj: &dev->kobj, action: KOBJ_CHANGE, envp);
797
798 if (type == hwmon_temp)
799 hwmon_thermal_notify(dev, index: 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(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(lock: &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, type: info->type, attr, index: i,
858 template: templates[attr], ops);
859 if (IS_ERR(ptr: a)) {
860 if (PTR_ERR(ptr: a) != -ENOENT)
861 return PTR_ERR(ptr: 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(info: chip->info[i]);
878
879 if (nattrs == 0)
880 return ERR_PTR(error: -EINVAL);
881
882 attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
883 if (!attrs)
884 return ERR_PTR(error: -ENOMEM);
885
886 for (i = 0; chip->info[i]; i++) {
887 ret = hwmon_genattrs(drvdata, attrs: &attrs[aindex], ops: chip->ops,
888 info: chip->info[i]);
889 if (ret < 0) {
890 hwmon_free_attrs(attrs);
891 return ERR_PTR(error: 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(ida: &hwmon_ida, GFP_KERNEL);
917 if (id < 0)
918 return ERR_PTR(error: 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(ptr: attrs)) {
944 err = PTR_ERR(ptr: 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, propname: "label")) {
963 err = device_property_read_string(dev, propname: "label", val: &label);
964 if (err < 0)
965 goto free_hwmon;
966
967 hwdev->label = kstrdup(s: 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(dev: hdev, data: drvdata);
983 dev_set_name(dev: hdev, HWMON_ID_FORMAT, id);
984 err = device_register(dev: hdev);
985 if (err) {
986 put_device(dev: hdev);
987 goto ida_remove;
988 }
989
990 INIT_LIST_HEAD(list: &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(dev: hdev);
998 if (err) {
999 device_unregister(dev: 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(dev: hdev);
1011 goto ida_remove;
1012 }
1013 }
1014 }
1015
1016 return hdev;
1017
1018free_hwmon:
1019 hwmon_dev_release(dev: hdev);
1020ida_remove:
1021 ida_free(&hwmon_ida, id);
1022 return ERR_PTR(error: 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(error: -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(error: -EINVAL);
1071
1072 if (!chip->ops || !(chip->ops->visible || chip->ops->is_visible) || !chip->info)
1073 return ERR_PTR(error: -EINVAL);
1074
1075 return __hwmon_device_register(dev, name, drvdata, chip, groups: 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(error: -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(error: -EINVAL);
1166
1167 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1168 if (!ptr)
1169 return ERR_PTR(error: -ENOMEM);
1170
1171 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
1172 if (IS_ERR(ptr: hwdev))
1173 goto error;
1174
1175 *ptr = hwdev;
1176 devres_add(dev, res: ptr);
1177 return hwdev;
1178
1179error:
1180 devres_free(res: 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(error: -EINVAL);
1206
1207 if (!name) {
1208 name = devm_hwmon_sanitize_name(dev, name: dev_name(dev));
1209 if (IS_ERR(ptr: name))
1210 return ERR_CAST(ptr: name);
1211 }
1212
1213 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1214 if (!ptr)
1215 return ERR_PTR(error: -ENOMEM);
1216
1217 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
1218 extra_groups);
1219 if (IS_ERR(ptr: hwdev))
1220 goto error;
1221
1222 *ptr = hwdev;
1223 devres_add(dev, res: ptr);
1224
1225 return hwdev;
1226
1227error:
1228 devres_free(res: 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, s: old_name, GFP_KERNEL);
1239 else
1240 name = kstrdup(s: old_name, GFP_KERNEL);
1241 if (!name)
1242 return ERR_PTR(error: -ENOMEM);
1243
1244 for (p = name; *p; p++)
1245 if (hwmon_is_bad_char(ch: *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, old_name: 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(error: -EINVAL);
1281
1282 return __hwmon_sanitize_name(dev, old_name: 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, device: 0x436c, NULL);
1295 if (sb) {
1296 if (sb->subsystem_vendor == 0x1462 && /* MSI */
1297 sb->subsystem_device == 0x0031) { /* MS-7031 */
1298 pci_read_config_byte(dev: sb, where: 0x48, val: &enable);
1299 pci_read_config_word(dev: sb, where: 0x64, val: &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(dev: sb, where: 0x64, val: 0x295);
1305 pci_write_config_byte(dev: sb, where: 0x48,
1306 val: enable | BIT(2));
1307 }
1308 }
1309 pci_dev_put(dev: 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(class: &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(class: &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
1340