Merge branch 'next' into for-linus
[platform/kernel/linux-rpi.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         .dev_groups = hwmon_dev_attr_groups,
142         .dev_release = hwmon_dev_release,
143 };
144
145 static DEFINE_IDA(hwmon_ida);
146
147 /* Thermal zone handling */
148
149 /*
150  * The complex conditional is necessary to avoid a cyclic dependency
151  * between hwmon and thermal_sys modules.
152  */
153 #ifdef CONFIG_THERMAL_OF
154 static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
155 {
156         struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
157         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
158         int ret;
159         long t;
160
161         ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
162                                      tdata->index, &t);
163         if (ret < 0)
164                 return ret;
165
166         *temp = t;
167
168         return 0;
169 }
170
171 static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
172 {
173         struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
174         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
175         const struct hwmon_chip_info *chip = hwdev->chip;
176         const struct hwmon_channel_info * const *info = chip->info;
177         unsigned int i;
178         int err;
179
180         if (!chip->ops->write)
181                 return 0;
182
183         for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
184                 continue;
185
186         if (!info[i])
187                 return 0;
188
189         if (info[i]->config[tdata->index] & HWMON_T_MIN) {
190                 err = chip->ops->write(tdata->dev, hwmon_temp,
191                                        hwmon_temp_min, tdata->index, low);
192                 if (err && err != -EOPNOTSUPP)
193                         return err;
194         }
195
196         if (info[i]->config[tdata->index] & HWMON_T_MAX) {
197                 err = chip->ops->write(tdata->dev, hwmon_temp,
198                                        hwmon_temp_max, tdata->index, high);
199                 if (err && err != -EOPNOTSUPP)
200                         return err;
201         }
202
203         return 0;
204 }
205
206 static const struct thermal_zone_device_ops hwmon_thermal_ops = {
207         .get_temp = hwmon_thermal_get_temp,
208         .set_trips = hwmon_thermal_set_trips,
209 };
210
211 static void hwmon_thermal_remove_sensor(void *data)
212 {
213         list_del(data);
214 }
215
216 static int hwmon_thermal_add_sensor(struct device *dev, int index)
217 {
218         struct hwmon_device *hwdev = to_hwmon_device(dev);
219         struct hwmon_thermal_data *tdata;
220         struct thermal_zone_device *tzd;
221         int err;
222
223         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
224         if (!tdata)
225                 return -ENOMEM;
226
227         tdata->dev = dev;
228         tdata->index = index;
229
230         tzd = devm_thermal_of_zone_register(dev, index, tdata,
231                                             &hwmon_thermal_ops);
232         if (IS_ERR(tzd)) {
233                 if (PTR_ERR(tzd) != -ENODEV)
234                         return PTR_ERR(tzd);
235                 dev_info(dev, "temp%d_input not attached to any thermal zone\n",
236                          index + 1);
237                 devm_kfree(dev, tdata);
238                 return 0;
239         }
240
241         err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
242         if (err)
243                 return err;
244
245         tdata->tzd = tzd;
246         list_add(&tdata->node, &hwdev->tzdata);
247
248         return 0;
249 }
250
251 static int hwmon_thermal_register_sensors(struct device *dev)
252 {
253         struct hwmon_device *hwdev = to_hwmon_device(dev);
254         const struct hwmon_chip_info *chip = hwdev->chip;
255         const struct hwmon_channel_info * const *info = chip->info;
256         void *drvdata = dev_get_drvdata(dev);
257         int i;
258
259         for (i = 1; info[i]; i++) {
260                 int j;
261
262                 if (info[i]->type != hwmon_temp)
263                         continue;
264
265                 for (j = 0; info[i]->config[j]; j++) {
266                         int err;
267
268                         if (!(info[i]->config[j] & HWMON_T_INPUT) ||
269                             !chip->ops->is_visible(drvdata, hwmon_temp,
270                                                    hwmon_temp_input, j))
271                                 continue;
272
273                         err = hwmon_thermal_add_sensor(dev, j);
274                         if (err)
275                                 return err;
276                 }
277         }
278
279         return 0;
280 }
281
282 static void hwmon_thermal_notify(struct device *dev, int index)
283 {
284         struct hwmon_device *hwdev = to_hwmon_device(dev);
285         struct hwmon_thermal_data *tzdata;
286
287         list_for_each_entry(tzdata, &hwdev->tzdata, node) {
288                 if (tzdata->index == index) {
289                         thermal_zone_device_update(tzdata->tzd,
290                                                    THERMAL_EVENT_UNSPECIFIED);
291                 }
292         }
293 }
294
295 #else
296 static int hwmon_thermal_register_sensors(struct device *dev)
297 {
298         return 0;
299 }
300
301 static void hwmon_thermal_notify(struct device *dev, int index) { }
302
303 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
304
305 static int hwmon_attr_base(enum hwmon_sensor_types type)
306 {
307         if (type == hwmon_in || type == hwmon_intrusion)
308                 return 0;
309         return 1;
310 }
311
312 /* sysfs attribute management */
313
314 static ssize_t hwmon_attr_show(struct device *dev,
315                                struct device_attribute *devattr, char *buf)
316 {
317         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
318         long val;
319         int ret;
320
321         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
322                                &val);
323         if (ret < 0)
324                 return ret;
325
326         trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
327                               hattr->name, val);
328
329         return sprintf(buf, "%ld\n", val);
330 }
331
332 static ssize_t hwmon_attr_show_string(struct device *dev,
333                                       struct device_attribute *devattr,
334                                       char *buf)
335 {
336         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
337         enum hwmon_sensor_types type = hattr->type;
338         const char *s;
339         int ret;
340
341         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
342                                       hattr->index, &s);
343         if (ret < 0)
344                 return ret;
345
346         trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
347                                      hattr->name, s);
348
349         return sprintf(buf, "%s\n", s);
350 }
351
352 static ssize_t hwmon_attr_store(struct device *dev,
353                                 struct device_attribute *devattr,
354                                 const char *buf, size_t count)
355 {
356         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
357         long val;
358         int ret;
359
360         ret = kstrtol(buf, 10, &val);
361         if (ret < 0)
362                 return ret;
363
364         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
365                                 val);
366         if (ret < 0)
367                 return ret;
368
369         trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
370                                hattr->name, val);
371
372         return count;
373 }
374
375 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
376 {
377         return (type == hwmon_temp && attr == hwmon_temp_label) ||
378                (type == hwmon_in && attr == hwmon_in_label) ||
379                (type == hwmon_curr && attr == hwmon_curr_label) ||
380                (type == hwmon_power && attr == hwmon_power_label) ||
381                (type == hwmon_energy && attr == hwmon_energy_label) ||
382                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
383                (type == hwmon_fan && attr == hwmon_fan_label);
384 }
385
386 static struct attribute *hwmon_genattr(const void *drvdata,
387                                        enum hwmon_sensor_types type,
388                                        u32 attr,
389                                        int index,
390                                        const char *template,
391                                        const struct hwmon_ops *ops)
392 {
393         struct hwmon_device_attribute *hattr;
394         struct device_attribute *dattr;
395         struct attribute *a;
396         umode_t mode;
397         const char *name;
398         bool is_string = is_string_attr(type, attr);
399
400         /* The attribute is invisible if there is no template string */
401         if (!template)
402                 return ERR_PTR(-ENOENT);
403
404         mode = ops->is_visible(drvdata, type, attr, index);
405         if (!mode)
406                 return ERR_PTR(-ENOENT);
407
408         if ((mode & 0444) && ((is_string && !ops->read_string) ||
409                                  (!is_string && !ops->read)))
410                 return ERR_PTR(-EINVAL);
411         if ((mode & 0222) && !ops->write)
412                 return ERR_PTR(-EINVAL);
413
414         hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
415         if (!hattr)
416                 return ERR_PTR(-ENOMEM);
417
418         if (type == hwmon_chip) {
419                 name = template;
420         } else {
421                 scnprintf(hattr->name, sizeof(hattr->name), template,
422                           index + hwmon_attr_base(type));
423                 name = hattr->name;
424         }
425
426         hattr->type = type;
427         hattr->attr = attr;
428         hattr->index = index;
429         hattr->ops = ops;
430
431         dattr = &hattr->dev_attr;
432         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
433         dattr->store = hwmon_attr_store;
434
435         a = &dattr->attr;
436         sysfs_attr_init(a);
437         a->name = name;
438         a->mode = mode;
439
440         return a;
441 }
442
443 /*
444  * Chip attributes are not attribute templates but actual sysfs attributes.
445  * See hwmon_genattr() for special handling.
446  */
447 static const char * const hwmon_chip_attrs[] = {
448         [hwmon_chip_temp_reset_history] = "temp_reset_history",
449         [hwmon_chip_in_reset_history] = "in_reset_history",
450         [hwmon_chip_curr_reset_history] = "curr_reset_history",
451         [hwmon_chip_power_reset_history] = "power_reset_history",
452         [hwmon_chip_update_interval] = "update_interval",
453         [hwmon_chip_alarms] = "alarms",
454         [hwmon_chip_samples] = "samples",
455         [hwmon_chip_curr_samples] = "curr_samples",
456         [hwmon_chip_in_samples] = "in_samples",
457         [hwmon_chip_power_samples] = "power_samples",
458         [hwmon_chip_temp_samples] = "temp_samples",
459 };
460
461 static const char * const hwmon_temp_attr_templates[] = {
462         [hwmon_temp_enable] = "temp%d_enable",
463         [hwmon_temp_input] = "temp%d_input",
464         [hwmon_temp_type] = "temp%d_type",
465         [hwmon_temp_lcrit] = "temp%d_lcrit",
466         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
467         [hwmon_temp_min] = "temp%d_min",
468         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
469         [hwmon_temp_max] = "temp%d_max",
470         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
471         [hwmon_temp_crit] = "temp%d_crit",
472         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
473         [hwmon_temp_emergency] = "temp%d_emergency",
474         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
475         [hwmon_temp_alarm] = "temp%d_alarm",
476         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
477         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
478         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
479         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
480         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
481         [hwmon_temp_fault] = "temp%d_fault",
482         [hwmon_temp_offset] = "temp%d_offset",
483         [hwmon_temp_label] = "temp%d_label",
484         [hwmon_temp_lowest] = "temp%d_lowest",
485         [hwmon_temp_highest] = "temp%d_highest",
486         [hwmon_temp_reset_history] = "temp%d_reset_history",
487         [hwmon_temp_rated_min] = "temp%d_rated_min",
488         [hwmon_temp_rated_max] = "temp%d_rated_max",
489 };
490
491 static const char * const hwmon_in_attr_templates[] = {
492         [hwmon_in_enable] = "in%d_enable",
493         [hwmon_in_input] = "in%d_input",
494         [hwmon_in_min] = "in%d_min",
495         [hwmon_in_max] = "in%d_max",
496         [hwmon_in_lcrit] = "in%d_lcrit",
497         [hwmon_in_crit] = "in%d_crit",
498         [hwmon_in_average] = "in%d_average",
499         [hwmon_in_lowest] = "in%d_lowest",
500         [hwmon_in_highest] = "in%d_highest",
501         [hwmon_in_reset_history] = "in%d_reset_history",
502         [hwmon_in_label] = "in%d_label",
503         [hwmon_in_alarm] = "in%d_alarm",
504         [hwmon_in_min_alarm] = "in%d_min_alarm",
505         [hwmon_in_max_alarm] = "in%d_max_alarm",
506         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
507         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
508         [hwmon_in_rated_min] = "in%d_rated_min",
509         [hwmon_in_rated_max] = "in%d_rated_max",
510 };
511
512 static const char * const hwmon_curr_attr_templates[] = {
513         [hwmon_curr_enable] = "curr%d_enable",
514         [hwmon_curr_input] = "curr%d_input",
515         [hwmon_curr_min] = "curr%d_min",
516         [hwmon_curr_max] = "curr%d_max",
517         [hwmon_curr_lcrit] = "curr%d_lcrit",
518         [hwmon_curr_crit] = "curr%d_crit",
519         [hwmon_curr_average] = "curr%d_average",
520         [hwmon_curr_lowest] = "curr%d_lowest",
521         [hwmon_curr_highest] = "curr%d_highest",
522         [hwmon_curr_reset_history] = "curr%d_reset_history",
523         [hwmon_curr_label] = "curr%d_label",
524         [hwmon_curr_alarm] = "curr%d_alarm",
525         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
526         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
527         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
528         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
529         [hwmon_curr_rated_min] = "curr%d_rated_min",
530         [hwmon_curr_rated_max] = "curr%d_rated_max",
531 };
532
533 static const char * const hwmon_power_attr_templates[] = {
534         [hwmon_power_enable] = "power%d_enable",
535         [hwmon_power_average] = "power%d_average",
536         [hwmon_power_average_interval] = "power%d_average_interval",
537         [hwmon_power_average_interval_max] = "power%d_interval_max",
538         [hwmon_power_average_interval_min] = "power%d_interval_min",
539         [hwmon_power_average_highest] = "power%d_average_highest",
540         [hwmon_power_average_lowest] = "power%d_average_lowest",
541         [hwmon_power_average_max] = "power%d_average_max",
542         [hwmon_power_average_min] = "power%d_average_min",
543         [hwmon_power_input] = "power%d_input",
544         [hwmon_power_input_highest] = "power%d_input_highest",
545         [hwmon_power_input_lowest] = "power%d_input_lowest",
546         [hwmon_power_reset_history] = "power%d_reset_history",
547         [hwmon_power_accuracy] = "power%d_accuracy",
548         [hwmon_power_cap] = "power%d_cap",
549         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
550         [hwmon_power_cap_max] = "power%d_cap_max",
551         [hwmon_power_cap_min] = "power%d_cap_min",
552         [hwmon_power_min] = "power%d_min",
553         [hwmon_power_max] = "power%d_max",
554         [hwmon_power_lcrit] = "power%d_lcrit",
555         [hwmon_power_crit] = "power%d_crit",
556         [hwmon_power_label] = "power%d_label",
557         [hwmon_power_alarm] = "power%d_alarm",
558         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
559         [hwmon_power_min_alarm] = "power%d_min_alarm",
560         [hwmon_power_max_alarm] = "power%d_max_alarm",
561         [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
562         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
563         [hwmon_power_rated_min] = "power%d_rated_min",
564         [hwmon_power_rated_max] = "power%d_rated_max",
565 };
566
567 static const char * const hwmon_energy_attr_templates[] = {
568         [hwmon_energy_enable] = "energy%d_enable",
569         [hwmon_energy_input] = "energy%d_input",
570         [hwmon_energy_label] = "energy%d_label",
571 };
572
573 static const char * const hwmon_humidity_attr_templates[] = {
574         [hwmon_humidity_enable] = "humidity%d_enable",
575         [hwmon_humidity_input] = "humidity%d_input",
576         [hwmon_humidity_label] = "humidity%d_label",
577         [hwmon_humidity_min] = "humidity%d_min",
578         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
579         [hwmon_humidity_max] = "humidity%d_max",
580         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
581         [hwmon_humidity_alarm] = "humidity%d_alarm",
582         [hwmon_humidity_fault] = "humidity%d_fault",
583         [hwmon_humidity_rated_min] = "humidity%d_rated_min",
584         [hwmon_humidity_rated_max] = "humidity%d_rated_max",
585 };
586
587 static const char * const hwmon_fan_attr_templates[] = {
588         [hwmon_fan_enable] = "fan%d_enable",
589         [hwmon_fan_input] = "fan%d_input",
590         [hwmon_fan_label] = "fan%d_label",
591         [hwmon_fan_min] = "fan%d_min",
592         [hwmon_fan_max] = "fan%d_max",
593         [hwmon_fan_div] = "fan%d_div",
594         [hwmon_fan_pulses] = "fan%d_pulses",
595         [hwmon_fan_target] = "fan%d_target",
596         [hwmon_fan_alarm] = "fan%d_alarm",
597         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
598         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
599         [hwmon_fan_fault] = "fan%d_fault",
600 };
601
602 static const char * const hwmon_pwm_attr_templates[] = {
603         [hwmon_pwm_input] = "pwm%d",
604         [hwmon_pwm_enable] = "pwm%d_enable",
605         [hwmon_pwm_mode] = "pwm%d_mode",
606         [hwmon_pwm_freq] = "pwm%d_freq",
607         [hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp",
608 };
609
610 static const char * const hwmon_intrusion_attr_templates[] = {
611         [hwmon_intrusion_alarm] = "intrusion%d_alarm",
612         [hwmon_intrusion_beep]  = "intrusion%d_beep",
613 };
614
615 static const char * const *__templates[] = {
616         [hwmon_chip] = hwmon_chip_attrs,
617         [hwmon_temp] = hwmon_temp_attr_templates,
618         [hwmon_in] = hwmon_in_attr_templates,
619         [hwmon_curr] = hwmon_curr_attr_templates,
620         [hwmon_power] = hwmon_power_attr_templates,
621         [hwmon_energy] = hwmon_energy_attr_templates,
622         [hwmon_humidity] = hwmon_humidity_attr_templates,
623         [hwmon_fan] = hwmon_fan_attr_templates,
624         [hwmon_pwm] = hwmon_pwm_attr_templates,
625         [hwmon_intrusion] = hwmon_intrusion_attr_templates,
626 };
627
628 static const int __templates_size[] = {
629         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
630         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
631         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
632         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
633         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
634         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
635         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
636         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
637         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
638         [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
639 };
640
641 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
642                        u32 attr, int channel)
643 {
644         char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
645         char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
646         char *envp[] = { event, NULL };
647         const char * const *templates;
648         const char *template;
649         int base;
650
651         if (type >= ARRAY_SIZE(__templates))
652                 return -EINVAL;
653         if (attr >= __templates_size[type])
654                 return -EINVAL;
655
656         templates = __templates[type];
657         template = templates[attr];
658
659         base = hwmon_attr_base(type);
660
661         scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
662         scnprintf(event, sizeof(event), "NAME=%s", sattr);
663         sysfs_notify(&dev->kobj, NULL, sattr);
664         kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
665
666         if (type == hwmon_temp)
667                 hwmon_thermal_notify(dev, channel);
668
669         return 0;
670 }
671 EXPORT_SYMBOL_GPL(hwmon_notify_event);
672
673 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
674 {
675         int i, n;
676
677         for (i = n = 0; info->config[i]; i++)
678                 n += hweight32(info->config[i]);
679
680         return n;
681 }
682
683 static int hwmon_genattrs(const void *drvdata,
684                           struct attribute **attrs,
685                           const struct hwmon_ops *ops,
686                           const struct hwmon_channel_info *info)
687 {
688         const char * const *templates;
689         int template_size;
690         int i, aindex = 0;
691
692         if (info->type >= ARRAY_SIZE(__templates))
693                 return -EINVAL;
694
695         templates = __templates[info->type];
696         template_size = __templates_size[info->type];
697
698         for (i = 0; info->config[i]; i++) {
699                 u32 attr_mask = info->config[i];
700                 u32 attr;
701
702                 while (attr_mask) {
703                         struct attribute *a;
704
705                         attr = __ffs(attr_mask);
706                         attr_mask &= ~BIT(attr);
707                         if (attr >= template_size)
708                                 return -EINVAL;
709                         a = hwmon_genattr(drvdata, info->type, attr, i,
710                                           templates[attr], ops);
711                         if (IS_ERR(a)) {
712                                 if (PTR_ERR(a) != -ENOENT)
713                                         return PTR_ERR(a);
714                                 continue;
715                         }
716                         attrs[aindex++] = a;
717                 }
718         }
719         return aindex;
720 }
721
722 static struct attribute **
723 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
724 {
725         int ret, i, aindex = 0, nattrs = 0;
726         struct attribute **attrs;
727
728         for (i = 0; chip->info[i]; i++)
729                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
730
731         if (nattrs == 0)
732                 return ERR_PTR(-EINVAL);
733
734         attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
735         if (!attrs)
736                 return ERR_PTR(-ENOMEM);
737
738         for (i = 0; chip->info[i]; i++) {
739                 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
740                                      chip->info[i]);
741                 if (ret < 0) {
742                         hwmon_free_attrs(attrs);
743                         return ERR_PTR(ret);
744                 }
745                 aindex += ret;
746         }
747
748         return attrs;
749 }
750
751 static struct device *
752 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
753                         const struct hwmon_chip_info *chip,
754                         const struct attribute_group **groups)
755 {
756         struct hwmon_device *hwdev;
757         const char *label;
758         struct device *hdev;
759         struct device *tdev = dev;
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         while (tdev && !tdev->of_node)
830                 tdev = tdev->parent;
831         hdev->of_node = tdev ? tdev->of_node : NULL;
832         hwdev->chip = chip;
833         dev_set_drvdata(hdev, drvdata);
834         dev_set_name(hdev, HWMON_ID_FORMAT, id);
835         err = device_register(hdev);
836         if (err) {
837                 put_device(hdev);
838                 goto ida_remove;
839         }
840
841         INIT_LIST_HEAD(&hwdev->tzdata);
842
843         if (hdev->of_node && chip && chip->ops->read &&
844             chip->info[0]->type == hwmon_chip &&
845             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
846                 err = hwmon_thermal_register_sensors(hdev);
847                 if (err) {
848                         device_unregister(hdev);
849                         /*
850                          * Don't worry about hwdev; hwmon_dev_release(), called
851                          * from device_unregister(), will free it.
852                          */
853                         goto ida_remove;
854                 }
855         }
856
857         return hdev;
858
859 free_hwmon:
860         hwmon_dev_release(hdev);
861 ida_remove:
862         ida_free(&hwmon_ida, id);
863         return ERR_PTR(err);
864 }
865
866 /**
867  * hwmon_device_register_with_groups - register w/ hwmon
868  * @dev: the parent device
869  * @name: hwmon name attribute
870  * @drvdata: driver data to attach to created device
871  * @groups: List of attribute groups to create
872  *
873  * hwmon_device_unregister() must be called when the device is no
874  * longer needed.
875  *
876  * Returns the pointer to the new device.
877  */
878 struct device *
879 hwmon_device_register_with_groups(struct device *dev, const char *name,
880                                   void *drvdata,
881                                   const struct attribute_group **groups)
882 {
883         if (!name)
884                 return ERR_PTR(-EINVAL);
885
886         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
887 }
888 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
889
890 /**
891  * hwmon_device_register_with_info - register w/ hwmon
892  * @dev: the parent device (mandatory)
893  * @name: hwmon name attribute (mandatory)
894  * @drvdata: driver data to attach to created device (optional)
895  * @chip: pointer to hwmon chip information (mandatory)
896  * @extra_groups: pointer to list of additional non-standard attribute groups
897  *      (optional)
898  *
899  * hwmon_device_unregister() must be called when the device is no
900  * longer needed.
901  *
902  * Returns the pointer to the new device.
903  */
904 struct device *
905 hwmon_device_register_with_info(struct device *dev, const char *name,
906                                 void *drvdata,
907                                 const struct hwmon_chip_info *chip,
908                                 const struct attribute_group **extra_groups)
909 {
910         if (!dev || !name || !chip)
911                 return ERR_PTR(-EINVAL);
912
913         if (!chip->ops || !chip->ops->is_visible || !chip->info)
914                 return ERR_PTR(-EINVAL);
915
916         return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
917 }
918 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
919
920 /**
921  * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem
922  * @dev: the parent device
923  * @name: hwmon name attribute
924  * @drvdata: driver data to attach to created device
925  *
926  * The use of this function is restricted. It is provided for legacy reasons
927  * and must only be called from the thermal subsystem.
928  *
929  * hwmon_device_unregister() must be called when the device is no
930  * longer needed.
931  *
932  * Returns the pointer to the new device.
933  */
934 struct device *
935 hwmon_device_register_for_thermal(struct device *dev, const char *name,
936                                   void *drvdata)
937 {
938         if (!name || !dev)
939                 return ERR_PTR(-EINVAL);
940
941         return __hwmon_device_register(dev, name, drvdata, NULL, NULL);
942 }
943 EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, HWMON_THERMAL);
944
945 /**
946  * hwmon_device_register - register w/ hwmon
947  * @dev: the device to register
948  *
949  * hwmon_device_unregister() must be called when the device is no
950  * longer needed.
951  *
952  * Returns the pointer to the new device.
953  */
954 struct device *hwmon_device_register(struct device *dev)
955 {
956         dev_warn(dev,
957                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
958
959         return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
960 }
961 EXPORT_SYMBOL_GPL(hwmon_device_register);
962
963 /**
964  * hwmon_device_unregister - removes the previously registered class device
965  *
966  * @dev: the class device to destroy
967  */
968 void hwmon_device_unregister(struct device *dev)
969 {
970         int id;
971
972         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
973                 device_unregister(dev);
974                 ida_free(&hwmon_ida, id);
975         } else
976                 dev_dbg(dev->parent,
977                         "hwmon_device_unregister() failed: bad class ID!\n");
978 }
979 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
980
981 static void devm_hwmon_release(struct device *dev, void *res)
982 {
983         struct device *hwdev = *(struct device **)res;
984
985         hwmon_device_unregister(hwdev);
986 }
987
988 /**
989  * devm_hwmon_device_register_with_groups - register w/ hwmon
990  * @dev: the parent device
991  * @name: hwmon name attribute
992  * @drvdata: driver data to attach to created device
993  * @groups: List of attribute groups to create
994  *
995  * Returns the pointer to the new device. The new device is automatically
996  * unregistered with the parent device.
997  */
998 struct device *
999 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
1000                                        void *drvdata,
1001                                        const struct attribute_group **groups)
1002 {
1003         struct device **ptr, *hwdev;
1004
1005         if (!dev)
1006                 return ERR_PTR(-EINVAL);
1007
1008         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1009         if (!ptr)
1010                 return ERR_PTR(-ENOMEM);
1011
1012         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
1013         if (IS_ERR(hwdev))
1014                 goto error;
1015
1016         *ptr = hwdev;
1017         devres_add(dev, ptr);
1018         return hwdev;
1019
1020 error:
1021         devres_free(ptr);
1022         return hwdev;
1023 }
1024 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
1025
1026 /**
1027  * devm_hwmon_device_register_with_info - register w/ hwmon
1028  * @dev:        the parent device
1029  * @name:       hwmon name attribute
1030  * @drvdata:    driver data to attach to created device
1031  * @chip:       pointer to hwmon chip information
1032  * @groups:     pointer to list of driver specific attribute groups
1033  *
1034  * Returns the pointer to the new device. The new device is automatically
1035  * unregistered with the parent device.
1036  */
1037 struct device *
1038 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
1039                                      void *drvdata,
1040                                      const struct hwmon_chip_info *chip,
1041                                      const struct attribute_group **groups)
1042 {
1043         struct device **ptr, *hwdev;
1044
1045         if (!dev)
1046                 return ERR_PTR(-EINVAL);
1047
1048         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1049         if (!ptr)
1050                 return ERR_PTR(-ENOMEM);
1051
1052         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
1053                                                 groups);
1054         if (IS_ERR(hwdev))
1055                 goto error;
1056
1057         *ptr = hwdev;
1058         devres_add(dev, ptr);
1059
1060         return hwdev;
1061
1062 error:
1063         devres_free(ptr);
1064         return hwdev;
1065 }
1066 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
1067
1068 static int devm_hwmon_match(struct device *dev, void *res, void *data)
1069 {
1070         struct device **hwdev = res;
1071
1072         return *hwdev == data;
1073 }
1074
1075 /**
1076  * devm_hwmon_device_unregister - removes a previously registered hwmon device
1077  *
1078  * @dev: the parent device of the device to unregister
1079  */
1080 void devm_hwmon_device_unregister(struct device *dev)
1081 {
1082         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
1083 }
1084 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
1085
1086 static char *__hwmon_sanitize_name(struct device *dev, const char *old_name)
1087 {
1088         char *name, *p;
1089
1090         if (dev)
1091                 name = devm_kstrdup(dev, old_name, GFP_KERNEL);
1092         else
1093                 name = kstrdup(old_name, GFP_KERNEL);
1094         if (!name)
1095                 return ERR_PTR(-ENOMEM);
1096
1097         for (p = name; *p; p++)
1098                 if (hwmon_is_bad_char(*p))
1099                         *p = '_';
1100
1101         return name;
1102 }
1103
1104 /**
1105  * hwmon_sanitize_name - Replaces invalid characters in a hwmon name
1106  * @name: NUL-terminated name
1107  *
1108  * Allocates a new string where any invalid characters will be replaced
1109  * by an underscore. It is the responsibility of the caller to release
1110  * the memory.
1111  *
1112  * Returns newly allocated name, or ERR_PTR on error.
1113  */
1114 char *hwmon_sanitize_name(const char *name)
1115 {
1116         return __hwmon_sanitize_name(NULL, name);
1117 }
1118 EXPORT_SYMBOL_GPL(hwmon_sanitize_name);
1119
1120 /**
1121  * devm_hwmon_sanitize_name - resource managed hwmon_sanitize_name()
1122  * @dev: device to allocate memory for
1123  * @name: NUL-terminated name
1124  *
1125  * Allocates a new string where any invalid characters will be replaced
1126  * by an underscore.
1127  *
1128  * Returns newly allocated name, or ERR_PTR on error.
1129  */
1130 char *devm_hwmon_sanitize_name(struct device *dev, const char *name)
1131 {
1132         if (!dev)
1133                 return ERR_PTR(-EINVAL);
1134
1135         return __hwmon_sanitize_name(dev, name);
1136 }
1137 EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name);
1138
1139 static void __init hwmon_pci_quirks(void)
1140 {
1141 #if defined CONFIG_X86 && defined CONFIG_PCI
1142         struct pci_dev *sb;
1143         u16 base;
1144         u8 enable;
1145
1146         /* Open access to 0x295-0x296 on MSI MS-7031 */
1147         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
1148         if (sb) {
1149                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
1150                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
1151                         pci_read_config_byte(sb, 0x48, &enable);
1152                         pci_read_config_word(sb, 0x64, &base);
1153
1154                         if (base == 0 && !(enable & BIT(2))) {
1155                                 dev_info(&sb->dev,
1156                                          "Opening wide generic port at 0x295\n");
1157                                 pci_write_config_word(sb, 0x64, 0x295);
1158                                 pci_write_config_byte(sb, 0x48,
1159                                                       enable | BIT(2));
1160                         }
1161                 }
1162                 pci_dev_put(sb);
1163         }
1164 #endif
1165 }
1166
1167 static int __init hwmon_init(void)
1168 {
1169         int err;
1170
1171         hwmon_pci_quirks();
1172
1173         err = class_register(&hwmon_class);
1174         if (err) {
1175                 pr_err("couldn't register hwmon sysfs class\n");
1176                 return err;
1177         }
1178         return 0;
1179 }
1180
1181 static void __exit hwmon_exit(void)
1182 {
1183         class_unregister(&hwmon_class);
1184 }
1185
1186 subsys_initcall(hwmon_init);
1187 module_exit(hwmon_exit);
1188
1189 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1190 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1191 MODULE_LICENSE("GPL");
1192