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