/* * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring * * This file defines the sysfs class "hwmon", for use by sensors drivers. * * Copyright (C) 2005 Mark M. Hoffman * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #define HWMON_ID_PREFIX "hwmon" #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d" struct hwmon_device { const char *name; struct device dev; const struct hwmon_chip_info *chip; struct attribute_group group; const struct attribute_group **groups; }; #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev) #define MAX_SYSFS_ATTR_NAME_LENGTH 32 struct hwmon_device_attribute { struct device_attribute dev_attr; const struct hwmon_ops *ops; enum hwmon_sensor_types type; u32 attr; int index; char name[MAX_SYSFS_ATTR_NAME_LENGTH]; }; #define to_hwmon_attr(d) \ container_of(d, struct hwmon_device_attribute, dev_attr) #define to_dev_attr(a) container_of(a, struct device_attribute, attr) /* * Thermal zone information * In addition to the reference to the hwmon device, * also provides the sensor index. */ struct hwmon_thermal_data { struct device *dev; /* Reference to hwmon device */ int index; /* sensor index */ }; static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%s\n", to_hwmon_device(dev)->name); } static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); static struct attribute *hwmon_dev_attrs[] = { &dev_attr_name.attr, NULL }; static umode_t hwmon_dev_name_is_visible(struct kobject *kobj, struct attribute *attr, int n) { struct device *dev = container_of(kobj, struct device, kobj); if (to_hwmon_device(dev)->name == NULL) return 0; return attr->mode; } static struct attribute_group hwmon_dev_attr_group = { .attrs = hwmon_dev_attrs, .is_visible = hwmon_dev_name_is_visible, }; static const struct attribute_group *hwmon_dev_attr_groups[] = { &hwmon_dev_attr_group, NULL }; static void hwmon_free_attrs(struct attribute **attrs) { int i; for (i = 0; attrs[i]; i++) { struct device_attribute *dattr = to_dev_attr(attrs[i]); struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr); kfree(hattr); } kfree(attrs); } static void hwmon_dev_release(struct device *dev) { struct hwmon_device *hwdev = to_hwmon_device(dev); if (hwdev->group.attrs) hwmon_free_attrs(hwdev->group.attrs); kfree(hwdev->groups); kfree(hwdev); } static struct class hwmon_class = { .name = "hwmon", .owner = THIS_MODULE, .dev_groups = hwmon_dev_attr_groups, .dev_release = hwmon_dev_release, }; static DEFINE_IDA(hwmon_ida); /* Thermal zone handling */ /* * The complex conditional is necessary to avoid a cyclic dependency * between hwmon and thermal_sys modules. */ #if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \ (!defined(CONFIG_THERMAL_HWMON) || \ !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL))) static int hwmon_thermal_get_temp(void *data, int *temp) { struct hwmon_thermal_data *tdata = data; struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); int ret; long t; ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input, tdata->index, &t); if (ret < 0) return ret; *temp = t; return 0; } static struct thermal_zone_of_device_ops hwmon_thermal_ops = { .get_temp = hwmon_thermal_get_temp, }; static int hwmon_thermal_add_sensor(struct device *dev, int index) { struct hwmon_thermal_data *tdata; struct thermal_zone_device *tzd; tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL); if (!tdata) return -ENOMEM; tdata->dev = dev; tdata->index = index; tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata, &hwmon_thermal_ops); /* * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV, * so ignore that error but forward any other error. */ if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV)) return PTR_ERR(tzd); return 0; } #else static int hwmon_thermal_add_sensor(struct device *dev, int index) { return 0; } #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */ /* sysfs attribute management */ static ssize_t hwmon_attr_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); long val; int ret; ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index, &val); if (ret < 0) return ret; return sprintf(buf, "%ld\n", val); } static ssize_t hwmon_attr_store(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); long val; int ret; ret = kstrtol(buf, 10, &val); if (ret < 0) return ret; ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index, val); if (ret < 0) return ret; return count; } static int hwmon_attr_base(enum hwmon_sensor_types type) { if (type == hwmon_in) return 0; return 1; } static struct attribute *hwmon_genattr(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int index, const char *template, const struct hwmon_ops *ops) { struct hwmon_device_attribute *hattr; struct device_attribute *dattr; struct attribute *a; umode_t mode; char *name; /* The attribute is invisible if there is no template string */ if (!template) return ERR_PTR(-ENOENT); mode = ops->is_visible(drvdata, type, attr, index); if (!mode) return ERR_PTR(-ENOENT); if ((mode & S_IRUGO) && !ops->read) return ERR_PTR(-EINVAL); if ((mode & S_IWUGO) && !ops->write) return ERR_PTR(-EINVAL); hattr = kzalloc(sizeof(*hattr), GFP_KERNEL); if (!hattr) return ERR_PTR(-ENOMEM); if (type == hwmon_chip) { name = (char *)template; } else { scnprintf(hattr->name, sizeof(hattr->name), template, index + hwmon_attr_base(type)); name = hattr->name; } hattr->type = type; hattr->attr = attr; hattr->index = index; hattr->ops = ops; dattr = &hattr->dev_attr; dattr->show = hwmon_attr_show; dattr->store = hwmon_attr_store; a = &dattr->attr; sysfs_attr_init(a); a->name = name; a->mode = mode; return a; } static const char * const hwmon_chip_attr_templates[] = { [hwmon_chip_temp_reset_history] = "temp_reset_history", [hwmon_chip_in_reset_history] = "in_reset_history", [hwmon_chip_curr_reset_history] = "curr_reset_history", [hwmon_chip_power_reset_history] = "power_reset_history", [hwmon_chip_update_interval] = "update_interval", [hwmon_chip_alarms] = "alarms", }; static const char * const hwmon_temp_attr_templates[] = { [hwmon_temp_input] = "temp%d_input", [hwmon_temp_type] = "temp%d_type", [hwmon_temp_lcrit] = "temp%d_lcrit", [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst", [hwmon_temp_min] = "temp%d_min", [hwmon_temp_min_hyst] = "temp%d_min_hyst", [hwmon_temp_max] = "temp%d_max", [hwmon_temp_max_hyst] = "temp%d_max_hyst", [hwmon_temp_crit] = "temp%d_crit", [hwmon_temp_crit_hyst] = "temp%d_crit_hyst", [hwmon_temp_emergency] = "temp%d_emergency", [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst", [hwmon_temp_alarm] = "temp%d_alarm", [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm", [hwmon_temp_min_alarm] = "temp%d_min_alarm", [hwmon_temp_max_alarm] = "temp%d_max_alarm", [hwmon_temp_crit_alarm] = "temp%d_crit_alarm", [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm", [hwmon_temp_fault] = "temp%d_fault", [hwmon_temp_offset] = "temp%d_offset", [hwmon_temp_label] = "temp%d_label", [hwmon_temp_lowest] = "temp%d_lowest", [hwmon_temp_highest] = "temp%d_highest", [hwmon_temp_reset_history] = "temp%d_reset_history", }; static const char * const hwmon_in_attr_templates[] = { [hwmon_in_input] = "in%d_input", [hwmon_in_min] = "in%d_min", [hwmon_in_max] = "in%d_max", [hwmon_in_lcrit] = "in%d_lcrit", [hwmon_in_crit] = "in%d_crit", [hwmon_in_average] = "in%d_average", [hwmon_in_lowest] = "in%d_lowest", [hwmon_in_highest] = "in%d_highest", [hwmon_in_reset_history] = "in%d_reset_history", [hwmon_in_label] = "in%d_label", [hwmon_in_alarm] = "in%d_alarm", [hwmon_in_min_alarm] = "in%d_min_alarm", [hwmon_in_max_alarm] = "in%d_max_alarm", [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm", [hwmon_in_crit_alarm] = "in%d_crit_alarm", }; static const char * const hwmon_curr_attr_templates[] = { [hwmon_curr_input] = "curr%d_input", [hwmon_curr_min] = "curr%d_min", [hwmon_curr_max] = "curr%d_max", [hwmon_curr_lcrit] = "curr%d_lcrit", [hwmon_curr_crit] = "curr%d_crit", [hwmon_curr_average] = "curr%d_average", [hwmon_curr_lowest] = "curr%d_lowest", [hwmon_curr_highest] = "curr%d_highest", [hwmon_curr_reset_history] = "curr%d_reset_history", [hwmon_curr_label] = "curr%d_label", [hwmon_curr_alarm] = "curr%d_alarm", [hwmon_curr_min_alarm] = "curr%d_min_alarm", [hwmon_curr_max_alarm] = "curr%d_max_alarm", [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm", [hwmon_curr_crit_alarm] = "curr%d_crit_alarm", }; static const char * const hwmon_power_attr_templates[] = { [hwmon_power_average] = "power%d_average", [hwmon_power_average_interval] = "power%d_average_interval", [hwmon_power_average_interval_max] = "power%d_interval_max", [hwmon_power_average_interval_min] = "power%d_interval_min", [hwmon_power_average_highest] = "power%d_average_highest", [hwmon_power_average_lowest] = "power%d_average_lowest", [hwmon_power_average_max] = "power%d_average_max", [hwmon_power_average_min] = "power%d_average_min", [hwmon_power_input] = "power%d_input", [hwmon_power_input_highest] = "power%d_input_highest", [hwmon_power_input_lowest] = "power%d_input_lowest", [hwmon_power_reset_history] = "power%d_reset_history", [hwmon_power_accuracy] = "power%d_accuracy", [hwmon_power_cap] = "power%d_cap", [hwmon_power_cap_hyst] = "power%d_cap_hyst", [hwmon_power_cap_max] = "power%d_cap_max", [hwmon_power_cap_min] = "power%d_cap_min", [hwmon_power_max] = "power%d_max", [hwmon_power_crit] = "power%d_crit", [hwmon_power_label] = "power%d_label", [hwmon_power_alarm] = "power%d_alarm", [hwmon_power_cap_alarm] = "power%d_cap_alarm", [hwmon_power_max_alarm] = "power%d_max_alarm", [hwmon_power_crit_alarm] = "power%d_crit_alarm", }; static const char * const hwmon_energy_attr_templates[] = { [hwmon_energy_input] = "energy%d_input", [hwmon_energy_label] = "energy%d_label", }; static const char * const hwmon_humidity_attr_templates[] = { [hwmon_humidity_input] = "humidity%d_input", [hwmon_humidity_label] = "humidity%d_label", [hwmon_humidity_min] = "humidity%d_min", [hwmon_humidity_min_hyst] = "humidity%d_min_hyst", [hwmon_humidity_max] = "humidity%d_max", [hwmon_humidity_max_hyst] = "humidity%d_max_hyst", [hwmon_humidity_alarm] = "humidity%d_alarm", [hwmon_humidity_fault] = "humidity%d_fault", }; static const char * const hwmon_fan_attr_templates[] = { [hwmon_fan_input] = "fan%d_input", [hwmon_fan_label] = "fan%d_label", [hwmon_fan_min] = "fan%d_min", [hwmon_fan_max] = "fan%d_max", [hwmon_fan_div] = "fan%d_div", [hwmon_fan_pulses] = "fan%d_pulses", [hwmon_fan_target] = "fan%d_target", [hwmon_fan_alarm] = "fan%d_alarm", [hwmon_fan_min_alarm] = "fan%d_min_alarm", [hwmon_fan_max_alarm] = "fan%d_max_alarm", [hwmon_fan_fault] = "fan%d_fault", }; static const char * const hwmon_pwm_attr_templates[] = { [hwmon_pwm_input] = "pwm%d", [hwmon_pwm_enable] = "pwm%d_enable", [hwmon_pwm_mode] = "pwm%d_mode", [hwmon_pwm_freq] = "pwm%d_freq", }; static const char * const *__templates[] = { [hwmon_chip] = hwmon_chip_attr_templates, [hwmon_temp] = hwmon_temp_attr_templates, [hwmon_in] = hwmon_in_attr_templates, [hwmon_curr] = hwmon_curr_attr_templates, [hwmon_power] = hwmon_power_attr_templates, [hwmon_energy] = hwmon_energy_attr_templates, [hwmon_humidity] = hwmon_humidity_attr_templates, [hwmon_fan] = hwmon_fan_attr_templates, [hwmon_pwm] = hwmon_pwm_attr_templates, }; static const int __templates_size[] = { [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attr_templates), [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates), [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates), [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates), [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates), [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates), [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates), [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates), [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates), }; static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info) { int i, n; for (i = n = 0; info->config[i]; i++) n += hweight32(info->config[i]); return n; } static int hwmon_genattrs(const void *drvdata, struct attribute **attrs, const struct hwmon_ops *ops, const struct hwmon_channel_info *info) { const char * const *templates; int template_size; int i, aindex = 0; if (info->type >= ARRAY_SIZE(__templates)) return -EINVAL; templates = __templates[info->type]; template_size = __templates_size[info->type]; for (i = 0; info->config[i]; i++) { u32 attr_mask = info->config[i]; u32 attr; while (attr_mask) { struct attribute *a; attr = __ffs(attr_mask); attr_mask &= ~BIT(attr); if (attr >= template_size) return -EINVAL; a = hwmon_genattr(drvdata, info->type, attr, i, templates[attr], ops); if (IS_ERR(a)) { if (PTR_ERR(a) != -ENOENT) return PTR_ERR(a); continue; } attrs[aindex++] = a; } } return aindex; } static struct attribute ** __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip) { int ret, i, aindex = 0, nattrs = 0; struct attribute **attrs; for (i = 0; chip->info[i]; i++) nattrs += hwmon_num_channel_attrs(chip->info[i]); if (nattrs == 0) return ERR_PTR(-EINVAL); attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL); if (!attrs) return ERR_PTR(-ENOMEM); for (i = 0; chip->info[i]; i++) { ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops, chip->info[i]); if (ret < 0) { hwmon_free_attrs(attrs); return ERR_PTR(ret); } aindex += ret; } return attrs; } 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) { struct hwmon_device *hwdev; struct device *hdev; int i, j, err, id; /* Do not accept invalid characters in hwmon name attribute */ if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) return ERR_PTR(-EINVAL); id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL); if (id < 0) return ERR_PTR(id); hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL); if (hwdev == NULL) { err = -ENOMEM; goto ida_remove; } hdev = &hwdev->dev; if (chip && chip->ops->is_visible) { struct attribute **attrs; int ngroups = 2; if (groups) for (i = 0; groups[i]; i++) ngroups++; hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL); if (!hwdev->groups) { err = -ENOMEM; goto free_hwmon; } attrs = __hwmon_create_attrs(drvdata, chip); if (IS_ERR(attrs)) { err = PTR_ERR(attrs); goto free_hwmon; } hwdev->group.attrs = attrs; ngroups = 0; hwdev->groups[ngroups++] = &hwdev->group; if (groups) { for (i = 0; groups[i]; i++) hwdev->groups[ngroups++] = groups[i]; } hdev->groups = hwdev->groups; } else { hdev->groups = groups; } hwdev->name = name; hdev->class = &hwmon_class; hdev->parent = dev; hdev->of_node = dev ? dev->of_node : NULL; hwdev->chip = chip; dev_set_drvdata(hdev, drvdata); dev_set_name(hdev, HWMON_ID_FORMAT, id); err = device_register(hdev); if (err) { put_device(hdev); goto ida_remove; } if (chip && chip->ops->is_visible && chip->ops->read && chip->info[0]->type == hwmon_chip && (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) { const struct hwmon_channel_info **info = chip->info; for (i = 1; info[i]; i++) { if (info[i]->type != hwmon_temp) continue; for (j = 0; info[i]->config[j]; j++) { if (!chip->ops->is_visible(drvdata, hwmon_temp, hwmon_temp_input, j)) continue; if (info[i]->config[j] & HWMON_T_INPUT) { err = hwmon_thermal_add_sensor(hdev, j); if (err) { device_unregister(hdev); goto ida_remove; } } } } } return hdev; free_hwmon: hwmon_dev_release(hdev); ida_remove: ida_simple_remove(&hwmon_ida, id); return ERR_PTR(err); } /** * hwmon_device_register_with_groups - register w/ hwmon * @dev: the parent device * @name: hwmon name attribute * @drvdata: driver data to attach to created device * @groups: List of attribute groups to create * * hwmon_device_unregister() must be called when the device is no * longer needed. * * Returns the pointer to the new device. */ struct device * hwmon_device_register_with_groups(struct device *dev, const char *name, void *drvdata, const struct attribute_group **groups) { return __hwmon_device_register(dev, name, drvdata, NULL, groups); } EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups); /** * hwmon_device_register_with_info - register w/ hwmon * @dev: the parent device * @name: hwmon name attribute * @drvdata: driver data to attach to created device * @info: Pointer to hwmon chip information * @groups - pointer to list of driver specific attribute groups * * hwmon_device_unregister() must be called when the device is no * longer needed. * * Returns the pointer to the new device. */ 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 **groups) { if (chip && (!chip->ops || !chip->info)) return ERR_PTR(-EINVAL); return __hwmon_device_register(dev, name, drvdata, chip, groups); } EXPORT_SYMBOL_GPL(hwmon_device_register_with_info); /** * hwmon_device_register - register w/ hwmon * @dev: the device to register * * hwmon_device_unregister() must be called when the device is no * longer needed. * * Returns the pointer to the new device. */ struct device *hwmon_device_register(struct device *dev) { return hwmon_device_register_with_groups(dev, NULL, NULL, NULL); } EXPORT_SYMBOL_GPL(hwmon_device_register); /** * hwmon_device_unregister - removes the previously registered class device * * @dev: the class device to destroy */ void hwmon_device_unregister(struct device *dev) { int id; if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) { device_unregister(dev); ida_simple_remove(&hwmon_ida, id); } else dev_dbg(dev->parent, "hwmon_device_unregister() failed: bad class ID!\n"); } EXPORT_SYMBOL_GPL(hwmon_device_unregister); static void devm_hwmon_release(struct device *dev, void *res) { struct device *hwdev = *(struct device **)res; hwmon_device_unregister(hwdev); } /** * devm_hwmon_device_register_with_groups - register w/ hwmon * @dev: the parent device * @name: hwmon name attribute * @drvdata: driver data to attach to created device * @groups: List of attribute groups to create * * Returns the pointer to the new device. The new device is automatically * unregistered with the parent device. */ struct device * devm_hwmon_device_register_with_groups(struct device *dev, const char *name, void *drvdata, const struct attribute_group **groups) { struct device **ptr, *hwdev; if (!dev) return ERR_PTR(-EINVAL); ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) return ERR_PTR(-ENOMEM); hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups); if (IS_ERR(hwdev)) goto error; *ptr = hwdev; devres_add(dev, ptr); return hwdev; error: devres_free(ptr); return hwdev; } EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups); /** * devm_hwmon_device_register_with_info - register w/ hwmon * @dev: the parent device * @name: hwmon name attribute * @drvdata: driver data to attach to created device * @info: Pointer to hwmon chip information * @groups - pointer to list of driver specific attribute groups * * Returns the pointer to the new device. The new device is automatically * unregistered with the parent device. */ 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) { struct device **ptr, *hwdev; if (!dev) return ERR_PTR(-EINVAL); ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) return ERR_PTR(-ENOMEM); hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip, groups); if (IS_ERR(hwdev)) goto error; *ptr = hwdev; devres_add(dev, ptr); return hwdev; error: devres_free(ptr); return hwdev; } EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info); static int devm_hwmon_match(struct device *dev, void *res, void *data) { struct device **hwdev = res; return *hwdev == data; } /** * devm_hwmon_device_unregister - removes a previously registered hwmon device * * @dev: the parent device of the device to unregister */ void devm_hwmon_device_unregister(struct device *dev) { WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev)); } EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister); static void __init hwmon_pci_quirks(void) { #if defined CONFIG_X86 && defined CONFIG_PCI struct pci_dev *sb; u16 base; u8 enable; /* Open access to 0x295-0x296 on MSI MS-7031 */ sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL); if (sb) { if (sb->subsystem_vendor == 0x1462 && /* MSI */ sb->subsystem_device == 0x0031) { /* MS-7031 */ pci_read_config_byte(sb, 0x48, &enable); pci_read_config_word(sb, 0x64, &base); if (base == 0 && !(enable & BIT(2))) { dev_info(&sb->dev, "Opening wide generic port at 0x295\n"); pci_write_config_word(sb, 0x64, 0x295); pci_write_config_byte(sb, 0x48, enable | BIT(2)); } } pci_dev_put(sb); } #endif } static int __init hwmon_init(void) { int err; hwmon_pci_quirks(); err = class_register(&hwmon_class); if (err) { pr_err("couldn't register hwmon sysfs class\n"); return err; } return 0; } static void __exit hwmon_exit(void) { class_unregister(&hwmon_class); } subsys_initcall(hwmon_init); module_exit(hwmon_exit); MODULE_AUTHOR("Mark M. Hoffman "); MODULE_DESCRIPTION("hardware monitoring sysfs/class support"); MODULE_LICENSE("GPL");