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