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