// SPDX-License-Identifier: GPL-2.0-or-later /* * A hwmon driver for ACPI 4.0 power meters * Copyright (C) 2009 IBM * * Author: Darrick J. Wong */ #include #include #include #include #include #include #include #include #include #include #include #include #define ACPI_POWER_METER_NAME "power_meter" #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" #define ACPI_POWER_METER_CLASS "pwr_meter_resource" #define NUM_SENSORS 17 #define POWER_METER_CAN_MEASURE (1 << 0) #define POWER_METER_CAN_TRIP (1 << 1) #define POWER_METER_CAN_CAP (1 << 2) #define POWER_METER_CAN_NOTIFY (1 << 3) #define POWER_METER_IS_BATTERY (1 << 8) #define UNKNOWN_HYSTERESIS 0xFFFFFFFF #define UNKNOWN_POWER 0xFFFFFFFF #define METER_NOTIFY_CONFIG 0x80 #define METER_NOTIFY_TRIP 0x81 #define METER_NOTIFY_CAP 0x82 #define METER_NOTIFY_CAPPING 0x83 #define METER_NOTIFY_INTERVAL 0x84 #define POWER_AVERAGE_NAME "power1_average" #define POWER_CAP_NAME "power1_cap" #define POWER_AVG_INTERVAL_NAME "power1_average_interval" #define POWER_ALARM_NAME "power1_alarm" static int cap_in_hardware; static bool force_cap_on; static int can_cap_in_hardware(void) { return force_cap_on || cap_in_hardware; } static const struct acpi_device_id power_meter_ids[] = { {"ACPI000D", 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, power_meter_ids); struct acpi_power_meter_capabilities { u64 flags; u64 units; u64 type; u64 accuracy; u64 sampling_time; u64 min_avg_interval; u64 max_avg_interval; u64 hysteresis; u64 configurable_cap; u64 min_cap; u64 max_cap; }; struct acpi_power_meter_resource { struct acpi_device *acpi_dev; acpi_bus_id name; struct mutex lock; struct device *hwmon_dev; struct acpi_power_meter_capabilities caps; acpi_string model_number; acpi_string serial_number; acpi_string oem_info; u64 power; u64 cap; u64 avg_interval; bool power_alarm; int sensors_valid; unsigned long sensors_last_updated; #define POWER_METER_TRIP_AVERAGE_MIN_IDX 0 #define POWER_METER_TRIP_AVERAGE_MAX_IDX 1 s64 trip[2]; int num_domain_devices; struct acpi_device **domain_devices; struct kobject *holders_dir; }; /* Averaging interval */ static int update_avg_interval(struct acpi_power_meter_resource *resource) { unsigned long long data; acpi_status status; status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", NULL, &data); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI", status); return -ENODEV; } resource->avg_interval = data; return 0; } /* Cap functions */ static int update_cap(struct acpi_power_meter_resource *resource) { unsigned long long data; acpi_status status; status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", NULL, &data); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL", status); return -ENODEV; } resource->cap = data; return 0; } /* Power meter trip points */ static int set_acpi_trip(struct acpi_power_meter_resource *resource) { union acpi_object arg_objs[] = { {ACPI_TYPE_INTEGER}, {ACPI_TYPE_INTEGER} }; struct acpi_object_list args = { 2, arg_objs }; unsigned long long data; acpi_status status; /* Both trip levels must be set */ if (resource->trip[0] < 0 || resource->trip[1] < 0) return 0; /* This driver stores min, max; ACPI wants max, min. */ arg_objs[0].integer.value = resource->trip[1]; arg_objs[1].integer.value = resource->trip[0]; status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", &args, &data); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP", status); return -EINVAL; } /* _PTP returns 0 on success, nonzero otherwise */ if (data) return -EINVAL; return 0; } /* Power meter */ static int update_meter(struct acpi_power_meter_resource *resource) { unsigned long long data; acpi_status status; unsigned long local_jiffies = jiffies; if (time_before(local_jiffies, resource->sensors_last_updated + msecs_to_jiffies(resource->caps.sampling_time)) && resource->sensors_valid) return 0; status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", NULL, &data); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM", status); return -ENODEV; } resource->power = data; resource->sensors_valid = 1; resource->sensors_last_updated = jiffies; return 0; } /* Read power domain data */ static void remove_domain_devices(struct acpi_power_meter_resource *resource) { int i; if (!resource->num_domain_devices) return; for (i = 0; i < resource->num_domain_devices; i++) { struct acpi_device *obj = resource->domain_devices[i]; if (!obj) continue; sysfs_remove_link(resource->holders_dir, kobject_name(&obj->dev.kobj)); acpi_dev_put(obj); } kfree(resource->domain_devices); kobject_put(resource->holders_dir); resource->num_domain_devices = 0; } static int read_domain_devices(struct acpi_power_meter_resource *resource) { int res = 0; int i; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *pss; acpi_status status; status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, &buffer); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMD", status); return -ENODEV; } pss = buffer.pointer; if (!pss || pss->type != ACPI_TYPE_PACKAGE) { dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME "Invalid _PMD data\n"); res = -EFAULT; goto end; } if (!pss->package.count) goto end; resource->domain_devices = kcalloc(pss->package.count, sizeof(struct acpi_device *), GFP_KERNEL); if (!resource->domain_devices) { res = -ENOMEM; goto end; } resource->holders_dir = kobject_create_and_add("measures", &resource->acpi_dev->dev.kobj); if (!resource->holders_dir) { res = -ENOMEM; goto exit_free; } resource->num_domain_devices = pss->package.count; for (i = 0; i < pss->package.count; i++) { struct acpi_device *obj; union acpi_object *element = &pss->package.elements[i]; /* Refuse non-references */ if (element->type != ACPI_TYPE_LOCAL_REFERENCE) continue; /* Create a symlink to domain objects */ obj = acpi_get_acpi_dev(element->reference.handle); resource->domain_devices[i] = obj; if (!obj) continue; res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, kobject_name(&obj->dev.kobj)); if (res) { acpi_dev_put(obj); resource->domain_devices[i] = NULL; } } res = 0; goto end; exit_free: kfree(resource->domain_devices); end: kfree(buffer.pointer); return res; } static int set_trip(struct acpi_power_meter_resource *resource, u16 trip_idx, unsigned long trip) { unsigned long trip_bk; int ret; trip = DIV_ROUND_CLOSEST(trip, 1000); trip_bk = resource->trip[trip_idx]; resource->trip[trip_idx] = trip; ret = set_acpi_trip(resource); if (ret) { dev_err(&resource->acpi_dev->dev, "set %s failed.\n", (trip_idx == POWER_METER_TRIP_AVERAGE_MIN_IDX) ? "power1_average_min" : "power1_average_max"); resource->trip[trip_idx] = trip_bk; } return ret; } static int set_cap(struct acpi_power_meter_resource *resource, unsigned long cap) { union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list args = { 1, &arg0 }; unsigned long long data; acpi_status status; cap = DIV_ROUND_CLOSEST(cap, 1000); if (cap > resource->caps.max_cap || cap < resource->caps.min_cap) return -EINVAL; arg0.integer.value = cap; status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", &args, &data); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL", status); return -EINVAL; } resource->cap = cap; /* _SHL returns 0 on success, nonzero otherwise */ if (data) return -EINVAL; return 0; } static int set_avg_interval(struct acpi_power_meter_resource *resource, unsigned long val) { union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list args = { 1, &arg0 }; unsigned long long data; acpi_status status; if (val > resource->caps.max_avg_interval || val < resource->caps.min_avg_interval) return -EINVAL; arg0.integer.value = val; status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", &args, &data); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI", status); return -EINVAL; } resource->avg_interval = val; /* _PAI returns 0 on success, nonzero otherwise */ if (data) return -EINVAL; return 0; } static int get_power_alarm_state(struct acpi_power_meter_resource *resource, long *val) { int ret; ret = update_meter(resource); if (ret) return ret; /* need to update cap if not to support the notification. */ if (!(resource->caps.flags & POWER_METER_CAN_NOTIFY)) { ret = update_cap(resource); if (ret) return ret; resource->power_alarm = resource->power > resource->cap; *val = resource->power_alarm; } else { *val = resource->power_alarm || resource->power > resource->cap; resource->power_alarm = resource->power > resource->cap; } return 0; } static umode_t power_meter_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { const struct acpi_power_meter_resource *res = data; if (type != hwmon_power) return 0; switch (attr) { case hwmon_power_average: case hwmon_power_average_interval_min: case hwmon_power_average_interval_max: if (res->caps.flags & POWER_METER_CAN_MEASURE) return 0444; break; case hwmon_power_average_interval: if (res->caps.flags & POWER_METER_CAN_MEASURE) return 0644; break; case hwmon_power_cap_min: case hwmon_power_cap_max: case hwmon_power_alarm: if (res->caps.flags & POWER_METER_CAN_CAP && can_cap_in_hardware()) return 0444; break; case hwmon_power_cap: if (res->caps.flags & POWER_METER_CAN_CAP && can_cap_in_hardware()) { if (res->caps.configurable_cap) return 0644; else return 0444; } break; default: break; } return 0; } static int power_meter_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); int ret = 0; if (type != hwmon_power) return -EINVAL; guard(mutex)(&res->lock); switch (attr) { case hwmon_power_average: ret = update_meter(res); if (ret) return ret; if (res->power == UNKNOWN_POWER) return -ENODATA; *val = res->power * 1000; break; case hwmon_power_average_interval_min: *val = res->caps.min_avg_interval; break; case hwmon_power_average_interval_max: *val = res->caps.max_avg_interval; break; case hwmon_power_average_interval: ret = update_avg_interval(res); if (ret) return ret; *val = (res)->avg_interval; break; case hwmon_power_cap_min: *val = res->caps.min_cap * 1000; break; case hwmon_power_cap_max: *val = res->caps.max_cap * 1000; break; case hwmon_power_alarm: ret = get_power_alarm_state(res, val); if (ret) return ret; break; case hwmon_power_cap: ret = update_cap(res); if (ret) return ret; *val = res->cap * 1000; break; default: break; } return 0; } static int power_meter_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); int ret; if (type != hwmon_power) return -EINVAL; guard(mutex)(&res->lock); switch (attr) { case hwmon_power_cap: ret = set_cap(res, val); break; case hwmon_power_average_interval: ret = set_avg_interval(res, val); break; default: ret = -EOPNOTSUPP; } return ret; } static const struct hwmon_channel_info * const power_meter_info[] = { HWMON_CHANNEL_INFO(power, HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL | HWMON_P_AVERAGE_INTERVAL_MIN | HWMON_P_AVERAGE_INTERVAL_MAX | HWMON_P_CAP | HWMON_P_CAP_MIN | HWMON_P_CAP_MAX | HWMON_P_ALARM), NULL }; static const struct hwmon_ops power_meter_ops = { .is_visible = power_meter_is_visible, .read = power_meter_read, .write = power_meter_write, }; static const struct hwmon_chip_info power_meter_chip_info = { .ops = &power_meter_ops, .info = power_meter_info, }; static ssize_t power1_average_max_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); unsigned long trip; int ret; ret = kstrtoul(buf, 10, &trip); if (ret) return ret; mutex_lock(&res->lock); ret = set_trip(res, POWER_METER_TRIP_AVERAGE_MAX_IDX, trip); mutex_unlock(&res->lock); return ret == 0 ? count : ret; } static ssize_t power1_average_min_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); unsigned long trip; int ret; ret = kstrtoul(buf, 10, &trip); if (ret) return ret; mutex_lock(&res->lock); ret = set_trip(res, POWER_METER_TRIP_AVERAGE_MIN_IDX, trip); mutex_unlock(&res->lock); return ret == 0 ? count : ret; } static ssize_t power1_average_min_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); if (res->trip[POWER_METER_TRIP_AVERAGE_MIN_IDX] < 0) return sysfs_emit(buf, "unknown\n"); return sysfs_emit(buf, "%lld\n", res->trip[POWER_METER_TRIP_AVERAGE_MIN_IDX] * 1000); } static ssize_t power1_average_max_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); if (res->trip[POWER_METER_TRIP_AVERAGE_MAX_IDX] < 0) return sysfs_emit(buf, "unknown\n"); return sysfs_emit(buf, "%lld\n", res->trip[POWER_METER_TRIP_AVERAGE_MAX_IDX] * 1000); } static ssize_t power1_cap_hyst_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); if (res->caps.hysteresis == UNKNOWN_HYSTERESIS) return sysfs_emit(buf, "unknown\n"); return sysfs_emit(buf, "%llu\n", res->caps.hysteresis * 1000); } static ssize_t power1_accuracy_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); unsigned int acc = res->caps.accuracy; return sysfs_emit(buf, "%u.%u%%\n", acc / 1000, acc % 1000); } static ssize_t power1_is_battery_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); return sysfs_emit(buf, "%u\n", res->caps.flags & POWER_METER_IS_BATTERY ? 1 : 0); } static ssize_t power1_model_number_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); return sysfs_emit(buf, "%s\n", res->model_number); } static ssize_t power1_oem_info_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); return sysfs_emit(buf, "%s\n", res->oem_info); } static ssize_t power1_serial_number_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_power_meter_resource *res = dev_get_drvdata(dev); return sysfs_emit(buf, "%s\n", res->serial_number); } /* depend on POWER_METER_CAN_TRIP */ static DEVICE_ATTR_RW(power1_average_max); static DEVICE_ATTR_RW(power1_average_min); /* depend on POWER_METER_CAN_CAP */ static DEVICE_ATTR_RO(power1_cap_hyst); /* depend on POWER_METER_CAN_MEASURE */ static DEVICE_ATTR_RO(power1_accuracy); static DEVICE_ATTR_RO(power1_is_battery); static DEVICE_ATTR_RO(power1_model_number); static DEVICE_ATTR_RO(power1_oem_info); static DEVICE_ATTR_RO(power1_serial_number); static umode_t power_extra_is_visible(struct kobject *kobj, struct attribute *attr, int idx) { struct device *dev = kobj_to_dev(kobj); struct acpi_power_meter_resource *res = dev_get_drvdata(dev); if (attr == &dev_attr_power1_is_battery.attr || attr == &dev_attr_power1_accuracy.attr) { if ((res->caps.flags & POWER_METER_CAN_MEASURE) == 0) return 0; } if (attr == &dev_attr_power1_cap_hyst.attr) { if ((res->caps.flags & POWER_METER_CAN_CAP) == 0) { return 0; } else if (!can_cap_in_hardware()) { dev_warn(&res->acpi_dev->dev, "Ignoring unsafe software power cap!\n"); return 0; } } if (attr == &dev_attr_power1_average_max.attr || attr == &dev_attr_power1_average_min.attr) { if ((res->caps.flags & POWER_METER_CAN_TRIP) == 0) return 0; } return attr->mode; } static struct attribute *power_extra_attrs[] = { &dev_attr_power1_average_max.attr, &dev_attr_power1_average_min.attr, &dev_attr_power1_cap_hyst.attr, &dev_attr_power1_accuracy.attr, &dev_attr_power1_is_battery.attr, &dev_attr_power1_model_number.attr, &dev_attr_power1_oem_info.attr, &dev_attr_power1_serial_number.attr, NULL }; static const struct attribute_group power_extra_group = { .attrs = power_extra_attrs, .is_visible = power_extra_is_visible, }; __ATTRIBUTE_GROUPS(power_extra); static void free_capabilities(struct acpi_power_meter_resource *resource) { acpi_string *str; int i; str = &resource->model_number; for (i = 0; i < 3; i++, str++) { kfree(*str); *str = NULL; } } static int read_capabilities(struct acpi_power_meter_resource *resource) { int res = 0; int i; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_buffer state = { 0, NULL }; struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; union acpi_object *pss; acpi_string *str; acpi_status status; status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, &buffer); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMC", status); return -ENODEV; } pss = buffer.pointer; if (!pss || pss->type != ACPI_TYPE_PACKAGE || pss->package.count != 14) { dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME "Invalid _PMC data\n"); res = -EFAULT; goto end; } /* Grab all the integer data at once */ state.length = sizeof(struct acpi_power_meter_capabilities); state.pointer = &resource->caps; status = acpi_extract_package(pss, &format, &state); if (ACPI_FAILURE(status)) { dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME "_PMC package parsing failed: %s\n", acpi_format_exception(status)); res = -EFAULT; goto end; } if (resource->caps.units) { dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME "Unknown units %llu.\n", resource->caps.units); res = -EINVAL; goto end; } /* Grab the string data */ str = &resource->model_number; for (i = 11; i < 14; i++) { union acpi_object *element = &pss->package.elements[i]; if (element->type != ACPI_TYPE_STRING) { res = -EINVAL; goto error; } *str = kmemdup_nul(element->string.pointer, element->string.length, GFP_KERNEL); if (!*str) { res = -ENOMEM; goto error; } str++; } dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); goto end; error: free_capabilities(resource); end: kfree(buffer.pointer); return res; } /* Handle ACPI event notifications */ static void acpi_power_meter_notify(struct acpi_device *device, u32 event) { struct acpi_power_meter_resource *resource; int res; if (!device || !acpi_driver_data(device)) return; resource = acpi_driver_data(device); switch (event) { case METER_NOTIFY_CONFIG: mutex_lock(&resource->lock); free_capabilities(resource); remove_domain_devices(resource); hwmon_device_unregister(resource->hwmon_dev); res = read_capabilities(resource); if (res) dev_err_once(&device->dev, "read capabilities failed.\n"); res = read_domain_devices(resource); if (res && res != -ENODEV) dev_err_once(&device->dev, "read domain devices failed.\n"); resource->hwmon_dev = hwmon_device_register_with_info(&device->dev, ACPI_POWER_METER_NAME, resource, &power_meter_chip_info, power_extra_groups); if (IS_ERR(resource->hwmon_dev)) dev_err_once(&device->dev, "register hwmon device failed.\n"); mutex_unlock(&resource->lock); break; case METER_NOTIFY_TRIP: sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); break; case METER_NOTIFY_CAP: mutex_lock(&resource->lock); res = update_cap(resource); if (res) dev_err_once(&device->dev, "update cap failed when capping value is changed.\n"); mutex_unlock(&resource->lock); sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); break; case METER_NOTIFY_INTERVAL: sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); break; case METER_NOTIFY_CAPPING: mutex_lock(&resource->lock); resource->power_alarm = true; mutex_unlock(&resource->lock); sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); dev_info(&device->dev, "Capping in progress.\n"); break; default: WARN(1, "Unexpected event %d\n", event); break; } acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, dev_name(&device->dev), event, 0); } static int acpi_power_meter_add(struct acpi_device *device) { int res; struct acpi_power_meter_resource *resource; if (!device) return -EINVAL; resource = kzalloc(sizeof(*resource), GFP_KERNEL); if (!resource) return -ENOMEM; resource->sensors_valid = 0; resource->acpi_dev = device; mutex_init(&resource->lock); strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); device->driver_data = resource; #if IS_REACHABLE(CONFIG_ACPI_IPMI) /* * On Dell systems several methods of acpi_power_meter access * variables in IPMI region, so wait until IPMI space handler is * installed by acpi_ipmi and also wait until SMI is selected to make * the space handler fully functional. */ if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.")) { struct acpi_device *ipi_device = acpi_dev_get_first_match_dev("IPI0001", NULL, -1); if (ipi_device && acpi_wait_for_acpi_ipmi()) dev_warn(&device->dev, "Waiting for ACPI IPMI timeout"); acpi_dev_put(ipi_device); } #endif res = read_capabilities(resource); if (res) goto exit_free; resource->trip[0] = -1; resource->trip[1] = -1; /* _PMD method is optional. */ res = read_domain_devices(resource); if (res && res != -ENODEV) goto exit_free_capability; resource->hwmon_dev = hwmon_device_register_with_info(&device->dev, ACPI_POWER_METER_NAME, resource, &power_meter_chip_info, power_extra_groups); if (IS_ERR(resource->hwmon_dev)) { res = PTR_ERR(resource->hwmon_dev); goto exit_remove; } res = 0; goto exit; exit_remove: remove_domain_devices(resource); exit_free_capability: free_capabilities(resource); exit_free: kfree(resource); exit: return res; } static void acpi_power_meter_remove(struct acpi_device *device) { struct acpi_power_meter_resource *resource; if (!device || !acpi_driver_data(device)) return; resource = acpi_driver_data(device); hwmon_device_unregister(resource->hwmon_dev); remove_domain_devices(resource); free_capabilities(resource); kfree(resource); } static int acpi_power_meter_resume(struct device *dev) { struct acpi_power_meter_resource *resource; if (!dev) return -EINVAL; resource = acpi_driver_data(to_acpi_device(dev)); if (!resource) return -EINVAL; free_capabilities(resource); read_capabilities(resource); return 0; } static DEFINE_SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume); static struct acpi_driver acpi_power_meter_driver = { .name = "power_meter", .class = ACPI_POWER_METER_CLASS, .ids = power_meter_ids, .ops = { .add = acpi_power_meter_add, .remove = acpi_power_meter_remove, .notify = acpi_power_meter_notify, }, .drv.pm = pm_sleep_ptr(&acpi_power_meter_pm), }; /* Module init/exit routines */ static int __init enable_cap_knobs(const struct dmi_system_id *d) { cap_in_hardware = 1; return 0; } static const struct dmi_system_id pm_dmi_table[] __initconst = { { enable_cap_knobs, "IBM Active Energy Manager", { DMI_MATCH(DMI_SYS_VENDOR, "IBM") }, }, {} }; static int __init acpi_power_meter_init(void) { int result; if (acpi_disabled) return -ENODEV; dmi_check_system(pm_dmi_table); result = acpi_bus_register_driver(&acpi_power_meter_driver); if (result < 0) return result; return 0; } static void __exit acpi_power_meter_exit(void) { acpi_bus_unregister_driver(&acpi_power_meter_driver); } MODULE_AUTHOR("Darrick J. Wong "); MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); MODULE_LICENSE("GPL"); module_param(force_cap_on, bool, 0644); MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); module_init(acpi_power_meter_init); module_exit(acpi_power_meter_exit);