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