33edb5c02f7d79d4e8ff7a75fe7ae03c84a83579
[linux-2.6-microblaze.git] / drivers / hwmon / hwmon.c
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
33 struct 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
47 struct 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  */
63 struct 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
70 static ssize_t
71 name_show(struct device *dev, struct device_attribute *attr, char *buf)
72 {
73         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
74 }
75 static DEVICE_ATTR_RO(name);
76
77 static ssize_t
78 label_show(struct device *dev, struct device_attribute *attr, char *buf)
79 {
80         return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label);
81 }
82 static DEVICE_ATTR_RO(label);
83
84 static struct attribute *hwmon_dev_attrs[] = {
85         &dev_attr_name.attr,
86         &dev_attr_label.attr,
87         NULL
88 };
89
90 static 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
105 static const struct attribute_group hwmon_dev_attr_group = {
106         .attrs          = hwmon_dev_attrs,
107         .is_visible     = hwmon_dev_attr_is_visible,
108 };
109
110 static const struct attribute_group *hwmon_dev_attr_groups[] = {
111         &hwmon_dev_attr_group,
112         NULL
113 };
114
115 static 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
128 static 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
139 static 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
146 static 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
155 static 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
172 static 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
207 static 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
212 static void hwmon_thermal_remove_sensor(void *data)
213 {
214         list_del(data);
215 }
216
217 static 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
252 static 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
283 static 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
297 static int hwmon_thermal_register_sensors(struct device *dev)
298 {
299         return 0;
300 }
301
302 static void hwmon_thermal_notify(struct device *dev, int index) { }
303
304 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
305
306 static 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
315 static 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
333 static 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
353 static 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
376 static 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
387 static 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  */
448 static 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
462 static 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
492 static 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
513 static 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
534 static 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
568 static 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
574 static 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
588 static 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
603 static 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
611 static const char * const hwmon_intrusion_attr_templates[] = {
612         [hwmon_intrusion_alarm] = "intrusion%d_alarm",
613         [hwmon_intrusion_beep]  = "intrusion%d_beep",
614 };
615
616 static 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
629 static 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
642 int 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 }
672 EXPORT_SYMBOL_GPL(hwmon_notify_event);
673
674 static 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
684 static 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
723 static 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
752 static 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
857 free_hwmon:
858         hwmon_dev_release(hdev);
859 ida_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  */
876 struct device *
877 hwmon_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 }
886 EXPORT_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  */
902 struct device *
903 hwmon_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 }
916 EXPORT_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  */
932 struct device *
933 hwmon_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 }
941 EXPORT_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  */
952 struct 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 }
959 EXPORT_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  */
966 void 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 }
977 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
978
979 static 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  */
996 struct device *
997 devm_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
1018 error:
1019         devres_free(ptr);
1020         return hwdev;
1021 }
1022 EXPORT_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  */
1035 struct device *
1036 devm_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
1060 error:
1061         devres_free(ptr);
1062         return hwdev;
1063 }
1064 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
1065
1066 static 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  */
1078 void devm_hwmon_device_unregister(struct device *dev)
1079 {
1080         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
1081 }
1082 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
1083
1084 static 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  */
1112 char *hwmon_sanitize_name(const char *name)
1113 {
1114         return __hwmon_sanitize_name(NULL, name);
1115 }
1116 EXPORT_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  */
1128 char *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 }
1135 EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name);
1136
1137 static 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
1165 static 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
1179 static void __exit hwmon_exit(void)
1180 {
1181         class_unregister(&hwmon_class);
1182 }
1183
1184 subsys_initcall(hwmon_init);
1185 module_exit(hwmon_exit);
1186
1187 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1188 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1189 MODULE_LICENSE("GPL");
1190