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10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/bitops.h>
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/gfp.h>
16#include <linux/hwmon.h>
17#include <linux/idr.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/pci.h>
21#include <linux/slab.h>
22#include <linux/string.h>
23#include <linux/thermal.h>
24
25#define CREATE_TRACE_POINTS
26#include <trace/events/hwmon.h>
27
28#define HWMON_ID_PREFIX "hwmon"
29#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
30
31struct hwmon_device {
32 const char *name;
33 struct device dev;
34 const struct hwmon_chip_info *chip;
35 struct list_head tzdata;
36 struct attribute_group group;
37 const struct attribute_group **groups;
38};
39
40#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
41
42#define MAX_SYSFS_ATTR_NAME_LENGTH 32
43
44struct hwmon_device_attribute {
45 struct device_attribute dev_attr;
46 const struct hwmon_ops *ops;
47 enum hwmon_sensor_types type;
48 u32 attr;
49 int index;
50 char name[MAX_SYSFS_ATTR_NAME_LENGTH];
51};
52
53#define to_hwmon_attr(d) \
54 container_of(d, struct hwmon_device_attribute, dev_attr)
55#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
56
57
58
59
60struct hwmon_thermal_data {
61 struct list_head node;
62 struct device *dev;
63 int index;
64 struct thermal_zone_device *tzd;
65};
66
67static ssize_t
68name_show(struct device *dev, struct device_attribute *attr, char *buf)
69{
70 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
71}
72static DEVICE_ATTR_RO(name);
73
74static struct attribute *hwmon_dev_attrs[] = {
75 &dev_attr_name.attr,
76 NULL
77};
78
79static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
80 struct attribute *attr, int n)
81{
82 struct device *dev = 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
90static const struct attribute_group hwmon_dev_attr_group = {
91 .attrs = hwmon_dev_attrs,
92 .is_visible = hwmon_dev_name_is_visible,
93};
94
95static const struct attribute_group *hwmon_dev_attr_groups[] = {
96 &hwmon_dev_attr_group,
97 NULL
98};
99
100static void hwmon_free_attrs(struct attribute **attrs)
101{
102 int i;
103
104 for (i = 0; attrs[i]; i++) {
105 struct device_attribute *dattr = to_dev_attr(attrs[i]);
106 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
107
108 kfree(hattr);
109 }
110 kfree(attrs);
111}
112
113static void hwmon_dev_release(struct device *dev)
114{
115 struct hwmon_device *hwdev = to_hwmon_device(dev);
116
117 if (hwdev->group.attrs)
118 hwmon_free_attrs(hwdev->group.attrs);
119 kfree(hwdev->groups);
120 kfree(hwdev);
121}
122
123static struct class hwmon_class = {
124 .name = "hwmon",
125 .owner = THIS_MODULE,
126 .dev_groups = hwmon_dev_attr_groups,
127 .dev_release = hwmon_dev_release,
128};
129
130static DEFINE_IDA(hwmon_ida);
131
132
133
134
135
136
137
138#ifdef CONFIG_THERMAL_OF
139static int hwmon_thermal_get_temp(void *data, int *temp)
140{
141 struct hwmon_thermal_data *tdata = data;
142 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
143 int ret;
144 long t;
145
146 ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
147 tdata->index, &t);
148 if (ret < 0)
149 return ret;
150
151 *temp = t;
152
153 return 0;
154}
155
156static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
157 .get_temp = hwmon_thermal_get_temp,
158};
159
160static void hwmon_thermal_remove_sensor(void *data)
161{
162 list_del(data);
163}
164
165static 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
183
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
198static 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
229static 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
243static int hwmon_thermal_register_sensors(struct device *dev)
244{
245 return 0;
246}
247
248static void hwmon_thermal_notify(struct device *dev, int index) { }
249
250#endif
251
252static 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
260
261static 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
279static 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
299static 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
322static 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
333static 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
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
392
393
394static 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
408static 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
436static 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
455static 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
474static 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
506static 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
512static 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
524static 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
539static 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
546static const char * const hwmon_intrusion_attr_templates[] = {
547 [hwmon_intrusion_alarm] = "intrusion%d_alarm",
548 [hwmon_intrusion_beep] = "intrusion%d_beep",
549};
550
551static 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
564static 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
577int 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}
604EXPORT_SYMBOL_GPL(hwmon_notify_event);
605
606static 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
616static 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
655static 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
684static 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
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;
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
766
767
768 goto ida_remove;
769 }
770 }
771
772 return hdev;
773
774free_hwmon:
775 hwmon_dev_release(hdev);
776ida_remove:
777 ida_simple_remove(&hwmon_ida, id);
778 return ERR_PTR(err);
779}
780
781
782
783
784
785
786
787
788
789
790
791
792
793struct device *
794hwmon_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}
803EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818struct device *
819hwmon_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}
835EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
836
837
838
839
840
841
842
843
844
845
846struct 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}
853EXPORT_SYMBOL_GPL(hwmon_device_register);
854
855
856
857
858
859
860void 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}
871EXPORT_SYMBOL_GPL(hwmon_device_unregister);
872
873static 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
882
883
884
885
886
887
888
889
890struct device *
891devm_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
912error:
913 devres_free(ptr);
914 return hwdev;
915}
916EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
917
918
919
920
921
922
923
924
925
926
927
928
929struct device *
930devm_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
954error:
955 devres_free(ptr);
956 return hwdev;
957}
958EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
959
960static 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
969
970
971
972void devm_hwmon_device_unregister(struct device *dev)
973{
974 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
975}
976EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
977
978static 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
986 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
987 if (sb) {
988 if (sb->subsystem_vendor == 0x1462 &&
989 sb->subsystem_device == 0x0031) {
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
1006static 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
1020static void __exit hwmon_exit(void)
1021{
1022 class_unregister(&hwmon_class);
1023}
1024
1025subsys_initcall(hwmon_init);
1026module_exit(hwmon_exit);
1027
1028MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1029MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1030MODULE_LICENSE("GPL");
1031
1032
