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/module.h>
19 #include <linux/pci.h>
20 #include <linux/slab.h>
21 #include <linux/string.h>
22 #include <linux/thermal.h>
23
24 #define CREATE_TRACE_POINTS
25 #include <trace/events/hwmon.h>
26
27 #define HWMON_ID_PREFIX "hwmon"
28 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
29
30 struct hwmon_device {
31 const char *name;
32 struct device dev;
33 const struct hwmon_chip_info *chip;
34
35 struct attribute_group group;
36 const struct attribute_group **groups;
37 };
38
39 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
40
41 #define MAX_SYSFS_ATTR_NAME_LENGTH 32
42
43 struct hwmon_device_attribute {
44 struct device_attribute dev_attr;
45 const struct hwmon_ops *ops;
46 enum hwmon_sensor_types type;
47 u32 attr;
48 int index;
49 char name[MAX_SYSFS_ATTR_NAME_LENGTH];
50 };
51
52 #define to_hwmon_attr(d) \
53 container_of(d, struct hwmon_device_attribute, dev_attr)
54 #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
55
56 /*
57 * Thermal zone information
58 * In addition to the reference to the hwmon device,
59 * also provides the sensor index.
60 */
61 struct hwmon_thermal_data {
62 struct device *dev; /* Reference to hwmon device */
63 int index; /* sensor index */
64 };
65
66 static ssize_t
name_show(struct device * dev,struct device_attribute * attr,char * buf)67 name_show(struct device *dev, struct device_attribute *attr, char *buf)
68 {
69 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
70 }
71 static DEVICE_ATTR_RO(name);
72
73 static struct attribute *hwmon_dev_attrs[] = {
74 &dev_attr_name.attr,
75 NULL
76 };
77
hwmon_dev_name_is_visible(struct kobject * kobj,struct attribute * attr,int n)78 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
79 struct attribute *attr, int n)
80 {
81 struct device *dev = container_of(kobj, struct device, kobj);
82
83 if (to_hwmon_device(dev)->name == NULL)
84 return 0;
85
86 return attr->mode;
87 }
88
89 static const struct attribute_group hwmon_dev_attr_group = {
90 .attrs = hwmon_dev_attrs,
91 .is_visible = hwmon_dev_name_is_visible,
92 };
93
94 static const struct attribute_group *hwmon_dev_attr_groups[] = {
95 &hwmon_dev_attr_group,
96 NULL
97 };
98
hwmon_free_attrs(struct attribute ** attrs)99 static void hwmon_free_attrs(struct attribute **attrs)
100 {
101 int i;
102
103 for (i = 0; attrs[i]; i++) {
104 struct device_attribute *dattr = to_dev_attr(attrs[i]);
105 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
106
107 kfree(hattr);
108 }
109 kfree(attrs);
110 }
111
hwmon_dev_release(struct device * dev)112 static void hwmon_dev_release(struct device *dev)
113 {
114 struct hwmon_device *hwdev = to_hwmon_device(dev);
115
116 if (hwdev->group.attrs)
117 hwmon_free_attrs(hwdev->group.attrs);
118 kfree(hwdev->groups);
119 kfree(hwdev);
120 }
121
122 static struct class hwmon_class = {
123 .name = "hwmon",
124 .owner = THIS_MODULE,
125 .dev_groups = hwmon_dev_attr_groups,
126 .dev_release = hwmon_dev_release,
127 };
128
129 static DEFINE_IDA(hwmon_ida);
130
131 /* Thermal zone handling */
132
133 /*
134 * The complex conditional is necessary to avoid a cyclic dependency
135 * between hwmon and thermal_sys modules.
136 */
137 #ifdef CONFIG_THERMAL_OF
hwmon_thermal_get_temp(void * data,int * temp)138 static int hwmon_thermal_get_temp(void *data, int *temp)
139 {
140 struct hwmon_thermal_data *tdata = data;
141 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
142 int ret;
143 long t;
144
145 ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
146 tdata->index, &t);
147 if (ret < 0)
148 return ret;
149
150 *temp = t;
151
152 return 0;
153 }
154
155 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
156 .get_temp = hwmon_thermal_get_temp,
157 };
158
hwmon_thermal_add_sensor(struct device * dev,int index)159 static int hwmon_thermal_add_sensor(struct device *dev, int index)
160 {
161 struct hwmon_thermal_data *tdata;
162 struct thermal_zone_device *tzd;
163
164 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
165 if (!tdata)
166 return -ENOMEM;
167
168 tdata->dev = dev;
169 tdata->index = index;
170
171 tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
172 &hwmon_thermal_ops);
173 /*
174 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
175 * so ignore that error but forward any other error.
176 */
177 if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
178 return PTR_ERR(tzd);
179
180 return 0;
181 }
182 #else
hwmon_thermal_add_sensor(struct device * dev,int index)183 static int hwmon_thermal_add_sensor(struct device *dev, int index)
184 {
185 return 0;
186 }
187 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
188
hwmon_attr_base(enum hwmon_sensor_types type)189 static int hwmon_attr_base(enum hwmon_sensor_types type)
190 {
191 if (type == hwmon_in)
192 return 0;
193 return 1;
194 }
195
196 /* sysfs attribute management */
197
hwmon_attr_show(struct device * dev,struct device_attribute * devattr,char * buf)198 static ssize_t hwmon_attr_show(struct device *dev,
199 struct device_attribute *devattr, char *buf)
200 {
201 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
202 long val;
203 int ret;
204
205 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
206 &val);
207 if (ret < 0)
208 return ret;
209
210 trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
211 hattr->name, val);
212
213 return sprintf(buf, "%ld\n", val);
214 }
215
hwmon_attr_show_string(struct device * dev,struct device_attribute * devattr,char * buf)216 static ssize_t hwmon_attr_show_string(struct device *dev,
217 struct device_attribute *devattr,
218 char *buf)
219 {
220 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
221 enum hwmon_sensor_types type = hattr->type;
222 const char *s;
223 int ret;
224
225 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
226 hattr->index, &s);
227 if (ret < 0)
228 return ret;
229
230 trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
231 hattr->name, s);
232
233 return sprintf(buf, "%s\n", s);
234 }
235
hwmon_attr_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)236 static ssize_t hwmon_attr_store(struct device *dev,
237 struct device_attribute *devattr,
238 const char *buf, size_t count)
239 {
240 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
241 long val;
242 int ret;
243
244 ret = kstrtol(buf, 10, &val);
245 if (ret < 0)
246 return ret;
247
248 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
249 val);
250 if (ret < 0)
251 return ret;
252
253 trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
254 hattr->name, val);
255
256 return count;
257 }
258
is_string_attr(enum hwmon_sensor_types type,u32 attr)259 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
260 {
261 return (type == hwmon_temp && attr == hwmon_temp_label) ||
262 (type == hwmon_in && attr == hwmon_in_label) ||
263 (type == hwmon_curr && attr == hwmon_curr_label) ||
264 (type == hwmon_power && attr == hwmon_power_label) ||
265 (type == hwmon_energy && attr == hwmon_energy_label) ||
266 (type == hwmon_humidity && attr == hwmon_humidity_label) ||
267 (type == hwmon_fan && attr == hwmon_fan_label);
268 }
269
hwmon_genattr(const void * drvdata,enum hwmon_sensor_types type,u32 attr,int index,const char * template,const struct hwmon_ops * ops)270 static struct attribute *hwmon_genattr(const void *drvdata,
271 enum hwmon_sensor_types type,
272 u32 attr,
273 int index,
274 const char *template,
275 const struct hwmon_ops *ops)
276 {
277 struct hwmon_device_attribute *hattr;
278 struct device_attribute *dattr;
279 struct attribute *a;
280 umode_t mode;
281 const char *name;
282 bool is_string = is_string_attr(type, attr);
283
284 /* The attribute is invisible if there is no template string */
285 if (!template)
286 return ERR_PTR(-ENOENT);
287
288 mode = ops->is_visible(drvdata, type, attr, index);
289 if (!mode)
290 return ERR_PTR(-ENOENT);
291
292 if ((mode & 0444) && ((is_string && !ops->read_string) ||
293 (!is_string && !ops->read)))
294 return ERR_PTR(-EINVAL);
295 if ((mode & 0222) && !ops->write)
296 return ERR_PTR(-EINVAL);
297
298 hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
299 if (!hattr)
300 return ERR_PTR(-ENOMEM);
301
302 if (type == hwmon_chip) {
303 name = template;
304 } else {
305 scnprintf(hattr->name, sizeof(hattr->name), template,
306 index + hwmon_attr_base(type));
307 name = hattr->name;
308 }
309
310 hattr->type = type;
311 hattr->attr = attr;
312 hattr->index = index;
313 hattr->ops = ops;
314
315 dattr = &hattr->dev_attr;
316 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
317 dattr->store = hwmon_attr_store;
318
319 a = &dattr->attr;
320 sysfs_attr_init(a);
321 a->name = name;
322 a->mode = mode;
323
324 return a;
325 }
326
327 /*
328 * Chip attributes are not attribute templates but actual sysfs attributes.
329 * See hwmon_genattr() for special handling.
330 */
331 static const char * const hwmon_chip_attrs[] = {
332 [hwmon_chip_temp_reset_history] = "temp_reset_history",
333 [hwmon_chip_in_reset_history] = "in_reset_history",
334 [hwmon_chip_curr_reset_history] = "curr_reset_history",
335 [hwmon_chip_power_reset_history] = "power_reset_history",
336 [hwmon_chip_update_interval] = "update_interval",
337 [hwmon_chip_alarms] = "alarms",
338 [hwmon_chip_samples] = "samples",
339 [hwmon_chip_curr_samples] = "curr_samples",
340 [hwmon_chip_in_samples] = "in_samples",
341 [hwmon_chip_power_samples] = "power_samples",
342 [hwmon_chip_temp_samples] = "temp_samples",
343 };
344
345 static const char * const hwmon_temp_attr_templates[] = {
346 [hwmon_temp_input] = "temp%d_input",
347 [hwmon_temp_type] = "temp%d_type",
348 [hwmon_temp_lcrit] = "temp%d_lcrit",
349 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
350 [hwmon_temp_min] = "temp%d_min",
351 [hwmon_temp_min_hyst] = "temp%d_min_hyst",
352 [hwmon_temp_max] = "temp%d_max",
353 [hwmon_temp_max_hyst] = "temp%d_max_hyst",
354 [hwmon_temp_crit] = "temp%d_crit",
355 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
356 [hwmon_temp_emergency] = "temp%d_emergency",
357 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
358 [hwmon_temp_alarm] = "temp%d_alarm",
359 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
360 [hwmon_temp_min_alarm] = "temp%d_min_alarm",
361 [hwmon_temp_max_alarm] = "temp%d_max_alarm",
362 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
363 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
364 [hwmon_temp_fault] = "temp%d_fault",
365 [hwmon_temp_offset] = "temp%d_offset",
366 [hwmon_temp_label] = "temp%d_label",
367 [hwmon_temp_lowest] = "temp%d_lowest",
368 [hwmon_temp_highest] = "temp%d_highest",
369 [hwmon_temp_reset_history] = "temp%d_reset_history",
370 };
371
372 static const char * const hwmon_in_attr_templates[] = {
373 [hwmon_in_input] = "in%d_input",
374 [hwmon_in_min] = "in%d_min",
375 [hwmon_in_max] = "in%d_max",
376 [hwmon_in_lcrit] = "in%d_lcrit",
377 [hwmon_in_crit] = "in%d_crit",
378 [hwmon_in_average] = "in%d_average",
379 [hwmon_in_lowest] = "in%d_lowest",
380 [hwmon_in_highest] = "in%d_highest",
381 [hwmon_in_reset_history] = "in%d_reset_history",
382 [hwmon_in_label] = "in%d_label",
383 [hwmon_in_alarm] = "in%d_alarm",
384 [hwmon_in_min_alarm] = "in%d_min_alarm",
385 [hwmon_in_max_alarm] = "in%d_max_alarm",
386 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
387 [hwmon_in_crit_alarm] = "in%d_crit_alarm",
388 [hwmon_in_enable] = "in%d_enable",
389 };
390
391 static const char * const hwmon_curr_attr_templates[] = {
392 [hwmon_curr_input] = "curr%d_input",
393 [hwmon_curr_min] = "curr%d_min",
394 [hwmon_curr_max] = "curr%d_max",
395 [hwmon_curr_lcrit] = "curr%d_lcrit",
396 [hwmon_curr_crit] = "curr%d_crit",
397 [hwmon_curr_average] = "curr%d_average",
398 [hwmon_curr_lowest] = "curr%d_lowest",
399 [hwmon_curr_highest] = "curr%d_highest",
400 [hwmon_curr_reset_history] = "curr%d_reset_history",
401 [hwmon_curr_label] = "curr%d_label",
402 [hwmon_curr_alarm] = "curr%d_alarm",
403 [hwmon_curr_min_alarm] = "curr%d_min_alarm",
404 [hwmon_curr_max_alarm] = "curr%d_max_alarm",
405 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
406 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
407 };
408
409 static const char * const hwmon_power_attr_templates[] = {
410 [hwmon_power_average] = "power%d_average",
411 [hwmon_power_average_interval] = "power%d_average_interval",
412 [hwmon_power_average_interval_max] = "power%d_interval_max",
413 [hwmon_power_average_interval_min] = "power%d_interval_min",
414 [hwmon_power_average_highest] = "power%d_average_highest",
415 [hwmon_power_average_lowest] = "power%d_average_lowest",
416 [hwmon_power_average_max] = "power%d_average_max",
417 [hwmon_power_average_min] = "power%d_average_min",
418 [hwmon_power_input] = "power%d_input",
419 [hwmon_power_input_highest] = "power%d_input_highest",
420 [hwmon_power_input_lowest] = "power%d_input_lowest",
421 [hwmon_power_reset_history] = "power%d_reset_history",
422 [hwmon_power_accuracy] = "power%d_accuracy",
423 [hwmon_power_cap] = "power%d_cap",
424 [hwmon_power_cap_hyst] = "power%d_cap_hyst",
425 [hwmon_power_cap_max] = "power%d_cap_max",
426 [hwmon_power_cap_min] = "power%d_cap_min",
427 [hwmon_power_min] = "power%d_min",
428 [hwmon_power_max] = "power%d_max",
429 [hwmon_power_lcrit] = "power%d_lcrit",
430 [hwmon_power_crit] = "power%d_crit",
431 [hwmon_power_label] = "power%d_label",
432 [hwmon_power_alarm] = "power%d_alarm",
433 [hwmon_power_cap_alarm] = "power%d_cap_alarm",
434 [hwmon_power_min_alarm] = "power%d_min_alarm",
435 [hwmon_power_max_alarm] = "power%d_max_alarm",
436 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
437 [hwmon_power_crit_alarm] = "power%d_crit_alarm",
438 };
439
440 static const char * const hwmon_energy_attr_templates[] = {
441 [hwmon_energy_input] = "energy%d_input",
442 [hwmon_energy_label] = "energy%d_label",
443 };
444
445 static const char * const hwmon_humidity_attr_templates[] = {
446 [hwmon_humidity_input] = "humidity%d_input",
447 [hwmon_humidity_label] = "humidity%d_label",
448 [hwmon_humidity_min] = "humidity%d_min",
449 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
450 [hwmon_humidity_max] = "humidity%d_max",
451 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
452 [hwmon_humidity_alarm] = "humidity%d_alarm",
453 [hwmon_humidity_fault] = "humidity%d_fault",
454 };
455
456 static const char * const hwmon_fan_attr_templates[] = {
457 [hwmon_fan_input] = "fan%d_input",
458 [hwmon_fan_label] = "fan%d_label",
459 [hwmon_fan_min] = "fan%d_min",
460 [hwmon_fan_max] = "fan%d_max",
461 [hwmon_fan_div] = "fan%d_div",
462 [hwmon_fan_pulses] = "fan%d_pulses",
463 [hwmon_fan_target] = "fan%d_target",
464 [hwmon_fan_alarm] = "fan%d_alarm",
465 [hwmon_fan_min_alarm] = "fan%d_min_alarm",
466 [hwmon_fan_max_alarm] = "fan%d_max_alarm",
467 [hwmon_fan_fault] = "fan%d_fault",
468 };
469
470 static const char * const hwmon_pwm_attr_templates[] = {
471 [hwmon_pwm_input] = "pwm%d",
472 [hwmon_pwm_enable] = "pwm%d_enable",
473 [hwmon_pwm_mode] = "pwm%d_mode",
474 [hwmon_pwm_freq] = "pwm%d_freq",
475 };
476
477 static const char * const *__templates[] = {
478 [hwmon_chip] = hwmon_chip_attrs,
479 [hwmon_temp] = hwmon_temp_attr_templates,
480 [hwmon_in] = hwmon_in_attr_templates,
481 [hwmon_curr] = hwmon_curr_attr_templates,
482 [hwmon_power] = hwmon_power_attr_templates,
483 [hwmon_energy] = hwmon_energy_attr_templates,
484 [hwmon_humidity] = hwmon_humidity_attr_templates,
485 [hwmon_fan] = hwmon_fan_attr_templates,
486 [hwmon_pwm] = hwmon_pwm_attr_templates,
487 };
488
489 static const int __templates_size[] = {
490 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
491 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
492 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
493 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
494 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
495 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
496 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
497 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
498 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
499 };
500
hwmon_num_channel_attrs(const struct hwmon_channel_info * info)501 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
502 {
503 int i, n;
504
505 for (i = n = 0; info->config[i]; i++)
506 n += hweight32(info->config[i]);
507
508 return n;
509 }
510
hwmon_genattrs(const void * drvdata,struct attribute ** attrs,const struct hwmon_ops * ops,const struct hwmon_channel_info * info)511 static int hwmon_genattrs(const void *drvdata,
512 struct attribute **attrs,
513 const struct hwmon_ops *ops,
514 const struct hwmon_channel_info *info)
515 {
516 const char * const *templates;
517 int template_size;
518 int i, aindex = 0;
519
520 if (info->type >= ARRAY_SIZE(__templates))
521 return -EINVAL;
522
523 templates = __templates[info->type];
524 template_size = __templates_size[info->type];
525
526 for (i = 0; info->config[i]; i++) {
527 u32 attr_mask = info->config[i];
528 u32 attr;
529
530 while (attr_mask) {
531 struct attribute *a;
532
533 attr = __ffs(attr_mask);
534 attr_mask &= ~BIT(attr);
535 if (attr >= template_size)
536 return -EINVAL;
537 a = hwmon_genattr(drvdata, info->type, attr, i,
538 templates[attr], ops);
539 if (IS_ERR(a)) {
540 if (PTR_ERR(a) != -ENOENT)
541 return PTR_ERR(a);
542 continue;
543 }
544 attrs[aindex++] = a;
545 }
546 }
547 return aindex;
548 }
549
550 static struct attribute **
__hwmon_create_attrs(const void * drvdata,const struct hwmon_chip_info * chip)551 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
552 {
553 int ret, i, aindex = 0, nattrs = 0;
554 struct attribute **attrs;
555
556 for (i = 0; chip->info[i]; i++)
557 nattrs += hwmon_num_channel_attrs(chip->info[i]);
558
559 if (nattrs == 0)
560 return ERR_PTR(-EINVAL);
561
562 attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
563 if (!attrs)
564 return ERR_PTR(-ENOMEM);
565
566 for (i = 0; chip->info[i]; i++) {
567 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
568 chip->info[i]);
569 if (ret < 0) {
570 hwmon_free_attrs(attrs);
571 return ERR_PTR(ret);
572 }
573 aindex += ret;
574 }
575
576 return attrs;
577 }
578
579 static struct device *
__hwmon_device_register(struct device * dev,const char * name,void * drvdata,const struct hwmon_chip_info * chip,const struct attribute_group ** groups)580 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
581 const struct hwmon_chip_info *chip,
582 const struct attribute_group **groups)
583 {
584 struct hwmon_device *hwdev;
585 struct device *hdev;
586 int i, j, err, id;
587
588 /* Complain about invalid characters in hwmon name attribute */
589 if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
590 dev_warn(dev,
591 "hwmon: '%s' is not a valid name attribute, please fix\n",
592 name);
593
594 id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
595 if (id < 0)
596 return ERR_PTR(id);
597
598 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
599 if (hwdev == NULL) {
600 err = -ENOMEM;
601 goto ida_remove;
602 }
603
604 hdev = &hwdev->dev;
605
606 if (chip) {
607 struct attribute **attrs;
608 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
609
610 if (groups)
611 for (i = 0; groups[i]; i++)
612 ngroups++;
613
614 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
615 if (!hwdev->groups) {
616 err = -ENOMEM;
617 goto free_hwmon;
618 }
619
620 attrs = __hwmon_create_attrs(drvdata, chip);
621 if (IS_ERR(attrs)) {
622 err = PTR_ERR(attrs);
623 goto free_hwmon;
624 }
625
626 hwdev->group.attrs = attrs;
627 ngroups = 0;
628 hwdev->groups[ngroups++] = &hwdev->group;
629
630 if (groups) {
631 for (i = 0; groups[i]; i++)
632 hwdev->groups[ngroups++] = groups[i];
633 }
634
635 hdev->groups = hwdev->groups;
636 } else {
637 hdev->groups = groups;
638 }
639
640 hwdev->name = name;
641 hdev->class = &hwmon_class;
642 hdev->parent = dev;
643 hdev->of_node = dev ? dev->of_node : NULL;
644 hwdev->chip = chip;
645 dev_set_drvdata(hdev, drvdata);
646 dev_set_name(hdev, HWMON_ID_FORMAT, id);
647 err = device_register(hdev);
648 if (err)
649 goto free_hwmon;
650
651 if (dev && dev->of_node && chip && chip->ops->read &&
652 chip->info[0]->type == hwmon_chip &&
653 (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
654 const struct hwmon_channel_info **info = chip->info;
655
656 for (i = 1; info[i]; i++) {
657 if (info[i]->type != hwmon_temp)
658 continue;
659
660 for (j = 0; info[i]->config[j]; j++) {
661 if (!chip->ops->is_visible(drvdata, hwmon_temp,
662 hwmon_temp_input, j))
663 continue;
664 if (info[i]->config[j] & HWMON_T_INPUT) {
665 err = hwmon_thermal_add_sensor(hdev, j);
666 if (err) {
667 device_unregister(hdev);
668 /*
669 * Don't worry about hwdev;
670 * hwmon_dev_release(), called
671 * from device_unregister(),
672 * will free it.
673 */
674 goto ida_remove;
675 }
676 }
677 }
678 }
679 }
680
681 return hdev;
682
683 free_hwmon:
684 hwmon_dev_release(hdev);
685 ida_remove:
686 ida_simple_remove(&hwmon_ida, id);
687 return ERR_PTR(err);
688 }
689
690 /**
691 * hwmon_device_register_with_groups - register w/ hwmon
692 * @dev: the parent device
693 * @name: hwmon name attribute
694 * @drvdata: driver data to attach to created device
695 * @groups: List of attribute groups to create
696 *
697 * hwmon_device_unregister() must be called when the device is no
698 * longer needed.
699 *
700 * Returns the pointer to the new device.
701 */
702 struct device *
hwmon_device_register_with_groups(struct device * dev,const char * name,void * drvdata,const struct attribute_group ** groups)703 hwmon_device_register_with_groups(struct device *dev, const char *name,
704 void *drvdata,
705 const struct attribute_group **groups)
706 {
707 if (!name)
708 return ERR_PTR(-EINVAL);
709
710 return __hwmon_device_register(dev, name, drvdata, NULL, groups);
711 }
712 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
713
714 /**
715 * hwmon_device_register_with_info - register w/ hwmon
716 * @dev: the parent device
717 * @name: hwmon name attribute
718 * @drvdata: driver data to attach to created device
719 * @chip: pointer to hwmon chip information
720 * @extra_groups: pointer to list of additional non-standard attribute groups
721 *
722 * hwmon_device_unregister() must be called when the device is no
723 * longer needed.
724 *
725 * Returns the pointer to the new device.
726 */
727 struct device *
hwmon_device_register_with_info(struct device * dev,const char * name,void * drvdata,const struct hwmon_chip_info * chip,const struct attribute_group ** extra_groups)728 hwmon_device_register_with_info(struct device *dev, const char *name,
729 void *drvdata,
730 const struct hwmon_chip_info *chip,
731 const struct attribute_group **extra_groups)
732 {
733 if (!name)
734 return ERR_PTR(-EINVAL);
735
736 if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
737 return ERR_PTR(-EINVAL);
738
739 if (chip && !dev)
740 return ERR_PTR(-EINVAL);
741
742 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
743 }
744 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
745
746 /**
747 * hwmon_device_register - register w/ hwmon
748 * @dev: the device to register
749 *
750 * hwmon_device_unregister() must be called when the device is no
751 * longer needed.
752 *
753 * Returns the pointer to the new device.
754 */
hwmon_device_register(struct device * dev)755 struct device *hwmon_device_register(struct device *dev)
756 {
757 dev_warn(dev,
758 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
759
760 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
761 }
762 EXPORT_SYMBOL_GPL(hwmon_device_register);
763
764 /**
765 * hwmon_device_unregister - removes the previously registered class device
766 *
767 * @dev: the class device to destroy
768 */
hwmon_device_unregister(struct device * dev)769 void hwmon_device_unregister(struct device *dev)
770 {
771 int id;
772
773 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
774 device_unregister(dev);
775 ida_simple_remove(&hwmon_ida, id);
776 } else
777 dev_dbg(dev->parent,
778 "hwmon_device_unregister() failed: bad class ID!\n");
779 }
780 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
781
devm_hwmon_release(struct device * dev,void * res)782 static void devm_hwmon_release(struct device *dev, void *res)
783 {
784 struct device *hwdev = *(struct device **)res;
785
786 hwmon_device_unregister(hwdev);
787 }
788
789 /**
790 * devm_hwmon_device_register_with_groups - register w/ hwmon
791 * @dev: the parent device
792 * @name: hwmon name attribute
793 * @drvdata: driver data to attach to created device
794 * @groups: List of attribute groups to create
795 *
796 * Returns the pointer to the new device. The new device is automatically
797 * unregistered with the parent device.
798 */
799 struct device *
devm_hwmon_device_register_with_groups(struct device * dev,const char * name,void * drvdata,const struct attribute_group ** groups)800 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
801 void *drvdata,
802 const struct attribute_group **groups)
803 {
804 struct device **ptr, *hwdev;
805
806 if (!dev)
807 return ERR_PTR(-EINVAL);
808
809 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
810 if (!ptr)
811 return ERR_PTR(-ENOMEM);
812
813 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
814 if (IS_ERR(hwdev))
815 goto error;
816
817 *ptr = hwdev;
818 devres_add(dev, ptr);
819 return hwdev;
820
821 error:
822 devres_free(ptr);
823 return hwdev;
824 }
825 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
826
827 /**
828 * devm_hwmon_device_register_with_info - register w/ hwmon
829 * @dev: the parent device
830 * @name: hwmon name attribute
831 * @drvdata: driver data to attach to created device
832 * @chip: pointer to hwmon chip information
833 * @groups: pointer to list of driver specific attribute groups
834 *
835 * Returns the pointer to the new device. The new device is automatically
836 * unregistered with the parent device.
837 */
838 struct device *
devm_hwmon_device_register_with_info(struct device * dev,const char * name,void * drvdata,const struct hwmon_chip_info * chip,const struct attribute_group ** groups)839 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
840 void *drvdata,
841 const struct hwmon_chip_info *chip,
842 const struct attribute_group **groups)
843 {
844 struct device **ptr, *hwdev;
845
846 if (!dev)
847 return ERR_PTR(-EINVAL);
848
849 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
850 if (!ptr)
851 return ERR_PTR(-ENOMEM);
852
853 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
854 groups);
855 if (IS_ERR(hwdev))
856 goto error;
857
858 *ptr = hwdev;
859 devres_add(dev, ptr);
860
861 return hwdev;
862
863 error:
864 devres_free(ptr);
865 return hwdev;
866 }
867 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
868
devm_hwmon_match(struct device * dev,void * res,void * data)869 static int devm_hwmon_match(struct device *dev, void *res, void *data)
870 {
871 struct device **hwdev = res;
872
873 return *hwdev == data;
874 }
875
876 /**
877 * devm_hwmon_device_unregister - removes a previously registered hwmon device
878 *
879 * @dev: the parent device of the device to unregister
880 */
devm_hwmon_device_unregister(struct device * dev)881 void devm_hwmon_device_unregister(struct device *dev)
882 {
883 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
884 }
885 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
886
hwmon_pci_quirks(void)887 static void __init hwmon_pci_quirks(void)
888 {
889 #if defined CONFIG_X86 && defined CONFIG_PCI
890 struct pci_dev *sb;
891 u16 base;
892 u8 enable;
893
894 /* Open access to 0x295-0x296 on MSI MS-7031 */
895 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
896 if (sb) {
897 if (sb->subsystem_vendor == 0x1462 && /* MSI */
898 sb->subsystem_device == 0x0031) { /* MS-7031 */
899 pci_read_config_byte(sb, 0x48, &enable);
900 pci_read_config_word(sb, 0x64, &base);
901
902 if (base == 0 && !(enable & BIT(2))) {
903 dev_info(&sb->dev,
904 "Opening wide generic port at 0x295\n");
905 pci_write_config_word(sb, 0x64, 0x295);
906 pci_write_config_byte(sb, 0x48,
907 enable | BIT(2));
908 }
909 }
910 pci_dev_put(sb);
911 }
912 #endif
913 }
914
hwmon_init(void)915 static int __init hwmon_init(void)
916 {
917 int err;
918
919 hwmon_pci_quirks();
920
921 err = class_register(&hwmon_class);
922 if (err) {
923 pr_err("couldn't register hwmon sysfs class\n");
924 return err;
925 }
926 return 0;
927 }
928
hwmon_exit(void)929 static void __exit hwmon_exit(void)
930 {
931 class_unregister(&hwmon_class);
932 }
933
934 subsys_initcall(hwmon_init);
935 module_exit(hwmon_exit);
936
937 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
938 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
939 MODULE_LICENSE("GPL");
940
941