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