2 * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
4 * This file defines the sysfs class "hwmon", for use by sensors drivers.
6 * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
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.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
27 #define HWMON_ID_PREFIX "hwmon"
28 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
33 const struct hwmon_chip_info *chip;
35 struct attribute_group group;
36 const struct attribute_group **groups;
39 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
41 #define MAX_SYSFS_ATTR_NAME_LENGTH 32
43 struct hwmon_device_attribute {
44 struct device_attribute dev_attr;
45 const struct hwmon_ops *ops;
46 enum hwmon_sensor_types type;
49 char name[MAX_SYSFS_ATTR_NAME_LENGTH];
52 #define to_hwmon_attr(d) \
53 container_of(d, struct hwmon_device_attribute, dev_attr)
56 * Thermal zone information
57 * In addition to the reference to the hwmon device,
58 * also provides the sensor index.
60 struct hwmon_thermal_data {
61 struct hwmon_device *hwdev; /* Reference to hwmon device */
62 int index; /* sensor index */
66 name_show(struct device *dev, struct device_attribute *attr, char *buf)
68 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
70 static DEVICE_ATTR_RO(name);
72 static struct attribute *hwmon_dev_attrs[] = {
77 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
78 struct attribute *attr, int n)
80 struct device *dev = container_of(kobj, struct device, kobj);
82 if (to_hwmon_device(dev)->name == NULL)
88 static const struct attribute_group hwmon_dev_attr_group = {
89 .attrs = hwmon_dev_attrs,
90 .is_visible = hwmon_dev_name_is_visible,
93 static const struct attribute_group *hwmon_dev_attr_groups[] = {
94 &hwmon_dev_attr_group,
98 static void hwmon_dev_release(struct device *dev)
100 kfree(to_hwmon_device(dev));
103 static struct class hwmon_class = {
105 .owner = THIS_MODULE,
106 .dev_groups = hwmon_dev_attr_groups,
107 .dev_release = hwmon_dev_release,
110 static DEFINE_IDA(hwmon_ida);
112 /* Thermal zone handling */
115 * The complex conditional is necessary to avoid a cyclic dependency
116 * between hwmon and thermal_sys modules.
118 #if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \
119 (!defined(CONFIG_THERMAL_HWMON) || \
120 !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL)))
121 static int hwmon_thermal_get_temp(void *data, int *temp)
123 struct hwmon_thermal_data *tdata = data;
124 struct hwmon_device *hwdev = tdata->hwdev;
128 ret = hwdev->chip->ops->read(&hwdev->dev, hwmon_temp, hwmon_temp_input,
138 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
139 .get_temp = hwmon_thermal_get_temp,
142 static int hwmon_thermal_add_sensor(struct device *dev,
143 struct hwmon_device *hwdev, int index)
145 struct hwmon_thermal_data *tdata;
146 struct thermal_zone_device *tzd;
148 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
152 tdata->hwdev = hwdev;
153 tdata->index = index;
155 tzd = devm_thermal_zone_of_sensor_register(&hwdev->dev, index, tdata,
158 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
159 * so ignore that error but forward any other error.
161 if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
167 static int hwmon_thermal_add_sensor(struct device *dev,
168 struct hwmon_device *hwdev, int index)
172 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
174 /* sysfs attribute management */
176 static ssize_t hwmon_attr_show(struct device *dev,
177 struct device_attribute *devattr, char *buf)
179 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
183 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
188 return sprintf(buf, "%ld\n", val);
191 static ssize_t hwmon_attr_show_string(struct device *dev,
192 struct device_attribute *devattr,
195 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
199 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
204 return sprintf(buf, "%s\n", s);
207 static ssize_t hwmon_attr_store(struct device *dev,
208 struct device_attribute *devattr,
209 const char *buf, size_t count)
211 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
215 ret = kstrtol(buf, 10, &val);
219 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
227 static int hwmon_attr_base(enum hwmon_sensor_types type)
229 if (type == hwmon_in)
234 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
236 return (type == hwmon_temp && attr == hwmon_temp_label) ||
237 (type == hwmon_in && attr == hwmon_in_label) ||
238 (type == hwmon_curr && attr == hwmon_curr_label) ||
239 (type == hwmon_power && attr == hwmon_power_label) ||
240 (type == hwmon_energy && attr == hwmon_energy_label) ||
241 (type == hwmon_humidity && attr == hwmon_humidity_label) ||
242 (type == hwmon_fan && attr == hwmon_fan_label);
245 static struct attribute *hwmon_genattr(struct device *dev,
247 enum hwmon_sensor_types type,
250 const char *template,
251 const struct hwmon_ops *ops)
253 struct hwmon_device_attribute *hattr;
254 struct device_attribute *dattr;
258 bool is_string = is_string_attr(type, attr);
260 /* The attribute is invisible if there is no template string */
262 return ERR_PTR(-ENOENT);
264 mode = ops->is_visible(drvdata, type, attr, index);
266 return ERR_PTR(-ENOENT);
268 if ((mode & S_IRUGO) && ((is_string && !ops->read_string) ||
269 (!is_string && !ops->read)))
270 return ERR_PTR(-EINVAL);
271 if ((mode & S_IWUGO) && !ops->write)
272 return ERR_PTR(-EINVAL);
274 hattr = devm_kzalloc(dev, sizeof(*hattr), GFP_KERNEL);
276 return ERR_PTR(-ENOMEM);
278 if (type == hwmon_chip) {
279 name = (char *)template;
281 scnprintf(hattr->name, sizeof(hattr->name), template,
282 index + hwmon_attr_base(type));
288 hattr->index = index;
291 dattr = &hattr->dev_attr;
292 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
293 dattr->store = hwmon_attr_store;
304 * Chip attributes are not attribute templates but actual sysfs attributes.
305 * See hwmon_genattr() for special handling.
307 static const char * const hwmon_chip_attrs[] = {
308 [hwmon_chip_temp_reset_history] = "temp_reset_history",
309 [hwmon_chip_in_reset_history] = "in_reset_history",
310 [hwmon_chip_curr_reset_history] = "curr_reset_history",
311 [hwmon_chip_power_reset_history] = "power_reset_history",
312 [hwmon_chip_update_interval] = "update_interval",
313 [hwmon_chip_alarms] = "alarms",
316 static const char * const hwmon_temp_attr_templates[] = {
317 [hwmon_temp_input] = "temp%d_input",
318 [hwmon_temp_type] = "temp%d_type",
319 [hwmon_temp_lcrit] = "temp%d_lcrit",
320 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
321 [hwmon_temp_min] = "temp%d_min",
322 [hwmon_temp_min_hyst] = "temp%d_min_hyst",
323 [hwmon_temp_max] = "temp%d_max",
324 [hwmon_temp_max_hyst] = "temp%d_max_hyst",
325 [hwmon_temp_crit] = "temp%d_crit",
326 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
327 [hwmon_temp_emergency] = "temp%d_emergency",
328 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
329 [hwmon_temp_alarm] = "temp%d_alarm",
330 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
331 [hwmon_temp_min_alarm] = "temp%d_min_alarm",
332 [hwmon_temp_max_alarm] = "temp%d_max_alarm",
333 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
334 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
335 [hwmon_temp_fault] = "temp%d_fault",
336 [hwmon_temp_offset] = "temp%d_offset",
337 [hwmon_temp_label] = "temp%d_label",
338 [hwmon_temp_lowest] = "temp%d_lowest",
339 [hwmon_temp_highest] = "temp%d_highest",
340 [hwmon_temp_reset_history] = "temp%d_reset_history",
343 static const char * const hwmon_in_attr_templates[] = {
344 [hwmon_in_input] = "in%d_input",
345 [hwmon_in_min] = "in%d_min",
346 [hwmon_in_max] = "in%d_max",
347 [hwmon_in_lcrit] = "in%d_lcrit",
348 [hwmon_in_crit] = "in%d_crit",
349 [hwmon_in_average] = "in%d_average",
350 [hwmon_in_lowest] = "in%d_lowest",
351 [hwmon_in_highest] = "in%d_highest",
352 [hwmon_in_reset_history] = "in%d_reset_history",
353 [hwmon_in_label] = "in%d_label",
354 [hwmon_in_alarm] = "in%d_alarm",
355 [hwmon_in_min_alarm] = "in%d_min_alarm",
356 [hwmon_in_max_alarm] = "in%d_max_alarm",
357 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
358 [hwmon_in_crit_alarm] = "in%d_crit_alarm",
361 static const char * const hwmon_curr_attr_templates[] = {
362 [hwmon_curr_input] = "curr%d_input",
363 [hwmon_curr_min] = "curr%d_min",
364 [hwmon_curr_max] = "curr%d_max",
365 [hwmon_curr_lcrit] = "curr%d_lcrit",
366 [hwmon_curr_crit] = "curr%d_crit",
367 [hwmon_curr_average] = "curr%d_average",
368 [hwmon_curr_lowest] = "curr%d_lowest",
369 [hwmon_curr_highest] = "curr%d_highest",
370 [hwmon_curr_reset_history] = "curr%d_reset_history",
371 [hwmon_curr_label] = "curr%d_label",
372 [hwmon_curr_alarm] = "curr%d_alarm",
373 [hwmon_curr_min_alarm] = "curr%d_min_alarm",
374 [hwmon_curr_max_alarm] = "curr%d_max_alarm",
375 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
376 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
379 static const char * const hwmon_power_attr_templates[] = {
380 [hwmon_power_average] = "power%d_average",
381 [hwmon_power_average_interval] = "power%d_average_interval",
382 [hwmon_power_average_interval_max] = "power%d_interval_max",
383 [hwmon_power_average_interval_min] = "power%d_interval_min",
384 [hwmon_power_average_highest] = "power%d_average_highest",
385 [hwmon_power_average_lowest] = "power%d_average_lowest",
386 [hwmon_power_average_max] = "power%d_average_max",
387 [hwmon_power_average_min] = "power%d_average_min",
388 [hwmon_power_input] = "power%d_input",
389 [hwmon_power_input_highest] = "power%d_input_highest",
390 [hwmon_power_input_lowest] = "power%d_input_lowest",
391 [hwmon_power_reset_history] = "power%d_reset_history",
392 [hwmon_power_accuracy] = "power%d_accuracy",
393 [hwmon_power_cap] = "power%d_cap",
394 [hwmon_power_cap_hyst] = "power%d_cap_hyst",
395 [hwmon_power_cap_max] = "power%d_cap_max",
396 [hwmon_power_cap_min] = "power%d_cap_min",
397 [hwmon_power_max] = "power%d_max",
398 [hwmon_power_crit] = "power%d_crit",
399 [hwmon_power_label] = "power%d_label",
400 [hwmon_power_alarm] = "power%d_alarm",
401 [hwmon_power_cap_alarm] = "power%d_cap_alarm",
402 [hwmon_power_max_alarm] = "power%d_max_alarm",
403 [hwmon_power_crit_alarm] = "power%d_crit_alarm",
406 static const char * const hwmon_energy_attr_templates[] = {
407 [hwmon_energy_input] = "energy%d_input",
408 [hwmon_energy_label] = "energy%d_label",
411 static const char * const hwmon_humidity_attr_templates[] = {
412 [hwmon_humidity_input] = "humidity%d_input",
413 [hwmon_humidity_label] = "humidity%d_label",
414 [hwmon_humidity_min] = "humidity%d_min",
415 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
416 [hwmon_humidity_max] = "humidity%d_max",
417 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
418 [hwmon_humidity_alarm] = "humidity%d_alarm",
419 [hwmon_humidity_fault] = "humidity%d_fault",
422 static const char * const hwmon_fan_attr_templates[] = {
423 [hwmon_fan_input] = "fan%d_input",
424 [hwmon_fan_label] = "fan%d_label",
425 [hwmon_fan_min] = "fan%d_min",
426 [hwmon_fan_max] = "fan%d_max",
427 [hwmon_fan_div] = "fan%d_div",
428 [hwmon_fan_pulses] = "fan%d_pulses",
429 [hwmon_fan_target] = "fan%d_target",
430 [hwmon_fan_alarm] = "fan%d_alarm",
431 [hwmon_fan_min_alarm] = "fan%d_min_alarm",
432 [hwmon_fan_max_alarm] = "fan%d_max_alarm",
433 [hwmon_fan_fault] = "fan%d_fault",
436 static const char * const hwmon_pwm_attr_templates[] = {
437 [hwmon_pwm_input] = "pwm%d",
438 [hwmon_pwm_enable] = "pwm%d_enable",
439 [hwmon_pwm_mode] = "pwm%d_mode",
440 [hwmon_pwm_freq] = "pwm%d_freq",
443 static const char * const *__templates[] = {
444 [hwmon_chip] = hwmon_chip_attrs,
445 [hwmon_temp] = hwmon_temp_attr_templates,
446 [hwmon_in] = hwmon_in_attr_templates,
447 [hwmon_curr] = hwmon_curr_attr_templates,
448 [hwmon_power] = hwmon_power_attr_templates,
449 [hwmon_energy] = hwmon_energy_attr_templates,
450 [hwmon_humidity] = hwmon_humidity_attr_templates,
451 [hwmon_fan] = hwmon_fan_attr_templates,
452 [hwmon_pwm] = hwmon_pwm_attr_templates,
455 static const int __templates_size[] = {
456 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
457 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
458 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
459 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
460 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
461 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
462 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
463 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
464 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
467 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
471 for (i = n = 0; info->config[i]; i++)
472 n += hweight32(info->config[i]);
477 static int hwmon_genattrs(struct device *dev,
479 struct attribute **attrs,
480 const struct hwmon_ops *ops,
481 const struct hwmon_channel_info *info)
483 const char * const *templates;
487 if (info->type >= ARRAY_SIZE(__templates))
490 templates = __templates[info->type];
491 template_size = __templates_size[info->type];
493 for (i = 0; info->config[i]; i++) {
494 u32 attr_mask = info->config[i];
500 attr = __ffs(attr_mask);
501 attr_mask &= ~BIT(attr);
502 if (attr >= template_size)
504 a = hwmon_genattr(dev, drvdata, info->type, attr, i,
505 templates[attr], ops);
507 if (PTR_ERR(a) != -ENOENT)
517 static struct attribute **
518 __hwmon_create_attrs(struct device *dev, const void *drvdata,
519 const struct hwmon_chip_info *chip)
521 int ret, i, aindex = 0, nattrs = 0;
522 struct attribute **attrs;
524 for (i = 0; chip->info[i]; i++)
525 nattrs += hwmon_num_channel_attrs(chip->info[i]);
528 return ERR_PTR(-EINVAL);
530 attrs = devm_kcalloc(dev, nattrs + 1, sizeof(*attrs), GFP_KERNEL);
532 return ERR_PTR(-ENOMEM);
534 for (i = 0; chip->info[i]; i++) {
535 ret = hwmon_genattrs(dev, drvdata, &attrs[aindex], chip->ops,
545 static struct device *
546 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
547 const struct hwmon_chip_info *chip,
548 const struct attribute_group **groups)
550 struct hwmon_device *hwdev;
554 /* Complain about invalid characters in hwmon name attribute */
555 if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
557 "hwmon: '%s' is not a valid name attribute, please fix\n",
560 id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
564 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
573 struct attribute **attrs;
574 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
577 for (i = 0; groups[i]; i++)
580 hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
582 if (!hwdev->groups) {
587 attrs = __hwmon_create_attrs(dev, drvdata, chip);
589 err = PTR_ERR(attrs);
593 hwdev->group.attrs = attrs;
595 hwdev->groups[ngroups++] = &hwdev->group;
598 for (i = 0; groups[i]; i++)
599 hwdev->groups[ngroups++] = groups[i];
602 hdev->groups = hwdev->groups;
604 hdev->groups = groups;
608 hdev->class = &hwmon_class;
610 hdev->of_node = dev ? dev->of_node : NULL;
612 dev_set_drvdata(hdev, drvdata);
613 dev_set_name(hdev, HWMON_ID_FORMAT, id);
614 err = device_register(hdev);
618 if (dev && chip && chip->ops->read &&
619 chip->info[0]->type == hwmon_chip &&
620 (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
621 const struct hwmon_channel_info **info = chip->info;
623 for (i = 1; info[i]; i++) {
624 if (info[i]->type != hwmon_temp)
627 for (j = 0; info[i]->config[j]; j++) {
628 if (!chip->ops->is_visible(drvdata, hwmon_temp,
629 hwmon_temp_input, j))
631 if (info[i]->config[j] & HWMON_T_INPUT) {
632 err = hwmon_thermal_add_sensor(dev,
644 device_unregister(hdev);
648 ida_simple_remove(&hwmon_ida, id);
653 * hwmon_device_register_with_groups - register w/ hwmon
654 * @dev: the parent device
655 * @name: hwmon name attribute
656 * @drvdata: driver data to attach to created device
657 * @groups: List of attribute groups to create
659 * hwmon_device_unregister() must be called when the device is no
662 * Returns the pointer to the new device.
665 hwmon_device_register_with_groups(struct device *dev, const char *name,
667 const struct attribute_group **groups)
670 return ERR_PTR(-EINVAL);
672 return __hwmon_device_register(dev, name, drvdata, NULL, groups);
674 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
677 * hwmon_device_register_with_info - register w/ hwmon
678 * @dev: the parent device
679 * @name: hwmon name attribute
680 * @drvdata: driver data to attach to created device
681 * @chip: pointer to hwmon chip information
682 * @extra_groups: pointer to list of additional non-standard attribute groups
684 * hwmon_device_unregister() must be called when the device is no
687 * Returns the pointer to the new device.
690 hwmon_device_register_with_info(struct device *dev, const char *name,
692 const struct hwmon_chip_info *chip,
693 const struct attribute_group **extra_groups)
696 return ERR_PTR(-EINVAL);
698 if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
699 return ERR_PTR(-EINVAL);
701 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
703 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
706 * hwmon_device_register - register w/ hwmon
707 * @dev: the device to register
709 * hwmon_device_unregister() must be called when the device is no
712 * Returns the pointer to the new device.
714 struct device *hwmon_device_register(struct device *dev)
717 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
719 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
721 EXPORT_SYMBOL_GPL(hwmon_device_register);
724 * hwmon_device_unregister - removes the previously registered class device
726 * @dev: the class device to destroy
728 void hwmon_device_unregister(struct device *dev)
732 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
733 device_unregister(dev);
734 ida_simple_remove(&hwmon_ida, id);
737 "hwmon_device_unregister() failed: bad class ID!\n");
739 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
741 static void devm_hwmon_release(struct device *dev, void *res)
743 struct device *hwdev = *(struct device **)res;
745 hwmon_device_unregister(hwdev);
749 * devm_hwmon_device_register_with_groups - register w/ hwmon
750 * @dev: the parent device
751 * @name: hwmon name attribute
752 * @drvdata: driver data to attach to created device
753 * @groups: List of attribute groups to create
755 * Returns the pointer to the new device. The new device is automatically
756 * unregistered with the parent device.
759 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
761 const struct attribute_group **groups)
763 struct device **ptr, *hwdev;
766 return ERR_PTR(-EINVAL);
768 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
770 return ERR_PTR(-ENOMEM);
772 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
777 devres_add(dev, ptr);
784 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
787 * devm_hwmon_device_register_with_info - register w/ hwmon
788 * @dev: the parent device
789 * @name: hwmon name attribute
790 * @drvdata: driver data to attach to created device
791 * @chip: pointer to hwmon chip information
792 * @groups: pointer to list of driver specific attribute groups
794 * Returns the pointer to the new device. The new device is automatically
795 * unregistered with the parent device.
798 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
800 const struct hwmon_chip_info *chip,
801 const struct attribute_group **groups)
803 struct device **ptr, *hwdev;
806 return ERR_PTR(-EINVAL);
808 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
810 return ERR_PTR(-ENOMEM);
812 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
818 devres_add(dev, ptr);
826 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
828 static int devm_hwmon_match(struct device *dev, void *res, void *data)
830 struct device **hwdev = res;
832 return *hwdev == data;
836 * devm_hwmon_device_unregister - removes a previously registered hwmon device
838 * @dev: the parent device of the device to unregister
840 void devm_hwmon_device_unregister(struct device *dev)
842 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
844 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
846 static void __init hwmon_pci_quirks(void)
848 #if defined CONFIG_X86 && defined CONFIG_PCI
853 /* Open access to 0x295-0x296 on MSI MS-7031 */
854 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
856 if (sb->subsystem_vendor == 0x1462 && /* MSI */
857 sb->subsystem_device == 0x0031) { /* MS-7031 */
858 pci_read_config_byte(sb, 0x48, &enable);
859 pci_read_config_word(sb, 0x64, &base);
861 if (base == 0 && !(enable & BIT(2))) {
863 "Opening wide generic port at 0x295\n");
864 pci_write_config_word(sb, 0x64, 0x295);
865 pci_write_config_byte(sb, 0x48,
874 static int __init hwmon_init(void)
880 err = class_register(&hwmon_class);
882 pr_err("couldn't register hwmon sysfs class\n");
888 static void __exit hwmon_exit(void)
890 class_unregister(&hwmon_class);
893 subsys_initcall(hwmon_init);
894 module_exit(hwmon_exit);
896 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
897 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
898 MODULE_LICENSE("GPL");