acpi power meter driver

the netlink event socket and a poll notification will be sent to the This service also exists in Windows 10 and 7. + return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); +/* Sensor descriptions. interval, an optional capping mechanism, and a couple of trip points. The power[1-*]_{model_number, serial_number, oem_info} fields display average power consumption exceeds the cap, an ACPI event will be broadcast on acpi_power_meter.c - drivers/hwmon/acpi_power_meter.c - Linux source code (v4.3) - Bootlin Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries.) A WDM driver that provides the Power Meter Interface (PMI) accesses power metering and budgeting (PMB) information from the underlying hardware platform. + struct acpi_device *obj = resource->domain_devices[i]; + sysfs_remove_link(resource->holders_dir, +static int read_domain_devices(struct acpi_power_meter_resource *resource). If you add a sensor, update NUM_SENSORS above! of Naming and data format standards for sysfs files. sysfs interface conforms with the specification outlined in the Power section There are a few other ACPI notifications that can be sent by the firmware. + struct device_attribute *devattr. This driver talks to ACPI 4.0 power meters. 2. The AcpiPmi service is using the acpipmi.sys file that is located in the C:\Windows\System32\drivers directory. contains symlinks to the devices that this meter measures. On hardware platforms that have an ACPI BIOS, the HAL causes Acpi.sys to be loaded during system startup at the base of the device tree. Copyright The kernel development community. + status = acpi_bus_get_device(element->reference.handle. This driver implements sensor reading support for the power meters exposed in Signed-off-by: Darrick J. Wong , > This driver exposes ACPI 4.0 compliant power meters as hardware monitoring, > devices. The ACPI 5.0 specification defines a number of device types to represent and control typical platform features. + To compile this driver as a module, choose M here: + the module will be called power-meter. Next in thread: ykzhao: "Re: [PATCH 2/2] acpi_power_meter: hwmon driver for ACPI 4.0 powermeters" Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] This driver exposes ACPI 4.0 compliant power meters as hardware monitoring Figure 3. + dev_info(&device->dev, "Capping in progress.\n"); + acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, +static int acpi_power_meter_add(struct acpi_device *device). Select your Windows 10 edition and release, and then click on the Download button below. Datasheet: https://uefi.org/specifications, section 10.4. > + struct acpi_device *acpi_dev = to_acpi_device(dev); > + struct acpi_power_meter_resource *resource = acpi_dev->driver_data; > + union acpi_object arg0 = { ACPI_TYPE_INTEGER }; > + struct acpi_object_list args = { 1, &arg0 }; > + res = strict_strtoul(buf, 10, &temp); > + if (temp > resource->caps.max_avg_interval ||, > + temp < resource->caps.min_avg_interval). This abstraction layer provides a consistent power supply and meter interface to the operating system across all hardware platforms. Some computers have the ability to enforce a power cap in hardware. The platform exposes this information by using the ACPI 4.0 Power Metering objects. Right-click the downloaded batch file and select Run as administrator. These devices have a simple set of features--a power meter that returns average power use over a configurable interval, an optional capping mechanism, and a couple of trip points. If this file is missing you can try to restore it from your Windows 8 installation media. In If this is + unsigned int acc = resource->caps.accuracy; + return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); +static ssize_t show_name(struct device *dev. +The power[1-*]_is_battery knob indicates if the power supply is a battery. The driver does this by using the ACPI PMI objects. + &resource->domain_devices[i]); + res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj. The power[1-*]_is_battery knob indicates if the power supply is a battery. +The measures/ directory contains symlinks to the devices that this meter, diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig, + This driver exposes ACPI 4.0 power meters as hardware monitoring, + devices. > + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); > > + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); > I find this test of `data' inexplicable. + val = resource->caps.hysteresis * 1000; + if (resource->caps.flags & POWER_METER_IS_BATTERY), + if (resource->trip[attr->index - 7] < 0). When the operating system startup is complete, the user is being notified that the AcpiPmi service hasn't been started. When the operating system startup is complete, the user is being notified that the AcpiPmi service hasn't been started. Save the RestoreACPIPowerMeterDriverWindows10.bat file to any folder on your hard drive. 2. 1. arbitrary strings that ACPI provides with the meter. + status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL". The driver does this by using the ACPI PMI objects. If the file is removed or corrupted, read this article to restore its original version from Windows 10 installation media. + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_power_meter_resource *resource = acpi_dev->driver_data; + return sprintf(buf, "%llu\n", resource->avg_interval); +static ssize_t set_avg_interval(struct device *dev. + *str = kzalloc(sizeof(u8) * (element->string.length + 1). When the Restore Default Startup Type of ACPI Power Meter Driver Automated Restore 1. +static ssize_t show_val(struct device *dev. The ACPI Power Meter Driver service is a kernel mode driver. +strings that ACPI provides with the meter. See the. ACPI Power Meter Driver - Windows 8 Service. The platform exposes this information by using the ACPI 4.0 Power Metering objects. Kernel driver power_meter The Linux Kernel documentation The Linux Kernel 5.12.0 The Linux kernel user's and administrator's guide Kernel Build System The Linux kernel firmware guide Open Firmware and Device Tree The Linux kernel user-space API guide Working with the kernel development community 3. Run the Command Prompt as an administrator. Startup Type. hardware has taken action to reduce power consumption. This second revision of the driver also exports the ACPI string. + union acpi_object *element = &(pss->package.elements[i]); + if (element->type != ACPI_TYPE_LOCAL_REFERENCE), + /* Create a symlink to domain objects */. + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); + resource->sensors_last_updated = jiffies; +static ssize_t show_power(struct device *dev. + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); + dev_err(&resource->acpi_dev->dev, PREFIX "Invalid _PMD data\n"); + resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *. +Both power[1-*]_average_{min,max} must be set before the trip points will work. If ACPI Power Meter Driver fails to start, the error details are added to Windows 8 error log. */, +static struct ro_sensor_template meter_ro_attrs[] = {. [PATCH 4.19 20/36] hwmon: (acpi_power_meter) Fix potential memory leak in acpi_power_meter_add() Greg Kroah-Hartman Tue, 07 Jul 2020 08:19:39 -0700 These devices have a simple set of +MODULE_DEVICE_TABLE(acpi, power_meter_ids); + struct acpi_power_meter_capabilities caps; + struct sensor_device_attribute sensors[NUM_SENSORS]; + struct device_attribute *devattr. 2. 4. In Windows 8 it will not be started until the user starts it. Select your Windows 7 edition and Service Pack, and then click on the Download button below. ACPI Power Metering Driver by Microsoft Corporation. The Windows ACPI driver, Acpi.sys, is an inbox component of the Windows operating system. Linux preempt-rt Check our new training course Real-Time Linux with PREEMPT_RT AMDGPU Driver with KFD used by the ROCm project. 2. This second revision of the driver also exports the ACPI string 4. 3. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of, + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + kobject_name(&obj->dev.kobj)); +static int register_ro_attrs(struct acpi_power_meter_resource *resource. Author: Darrick J. Wong Description ----- This driver implements sensor reading support for the power meters exposed in the ACPI 4.0 spec (Chapter 10.4). + const char *buf, size_t count); +static int update_avg_interval(struct acpi_power_meter_resource *resource). Say Y (or M) if you have an Intel or AMD computer with. + * GNU General Public License for more details. Is it just me, or do we need. + val = resource->trip[attr->index - 7] * 1000; +static ssize_t show_accuracy(struct device *dev. + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); +static ssize_t show_cap(struct device *dev. interval. + device_remove_file(&resource->acpi_dev->dev, +static int setup_attrs(struct acpi_power_meter_resource *resource), + if (resource->caps.flags & POWER_METER_CAN_MEASURE) {. Save the RestoreACPIPowerMeterDriverWindows7.bat file to any folder on your hard drive. Also contains the current Linux Kernel that matches this base driver - ROCK-Kernel-Driver/acpi_power_meter.c at . These devices have a simple set of features-a power meter that returns average power use over a configurable interval, an optional capping mechanism, and a couple of trip points. + strncpy(*str, element->string.pointer, element->string.length); + dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); +static void acpi_power_meter_notify(struct acpi_device *device, u32 event). Run the Command Prompt as an administrator. 2. 1. The AcpiPmi service is using the acpipmi.sys file that is located in the C:\Windows\System32\drivers directory. +This driver implements sensor reading support for the power meters exposed in, +the ACPI 4.0 spec (Chapter 10.4). 2. When both of them are set, an ACPI event will be broadcast on the ACPI netlink %SystemRoot%\System32\drivers\acpipmi.sys, HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AcpiPmi. +This driver talks to ACPI 4.0 power meters. +{"power1_average_min", show_val, set_trip, 7}. + status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM". + union acpi_object arg0 = { ACPI_TYPE_INTEGER }; + struct acpi_object_list args = { 1, &arg0 }; + if (temp > resource->caps.max_avg_interval ||, + temp < resource->caps.min_avg_interval). A WDM driver that provides the Power Meter Interface (PMI) accesses power metering and budgeting (PMB) information from the underlying hardware platform. + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); +static ssize_t set_trip(struct device *dev, struct device_attribute *devattr. Copy the command below, paste it into the command window and press ENTER: sc config AcpiPmi start= demand 3. ACPI Power Metering Driver by Microsoft Corporation. ACPI Power Metering Driver by Microsoft Corporation. The ACPI Power Meter Driver service is a kernel device driver. If the file is removed or corrupted, read this article to restore its original version from Windows 8 installation media. +{"power1_average_interval_min", show_val, 0}. ACPI Power Meter Driver is a kernel device driver. power[1-*]_average sysfs file. This second revision of the driver also exports the ACPI string info as sysfs attributes, a list of the devices that the meter measures, and will send ACPI notifications over the ACPI netlink socket. Close the command window and restart the computer. + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); + dev_err(&resource->acpi_dev->dev, PREFIX "Invalid _PMC data\n"); + /* Grab all the integer data at once */. + pss->package.count, GFP_KERNEL); + resource->holders_dir = kobject_create_and_add("measures". The sysfs interface conforms with the specification . + resource->num_domain_devices = pss->package.count; + for (i = 0; i < pss->package.count; i++) {. This service also exists in Windows 10 and 7. The ACPI PMI is provided by the ACPI 4.0 Power Metering objects. + &resource->sensors[resource->num_sensors]; + sensors->dev_attr.attr.name = ro->label; + sensors->dev_attr.attr.mode = S_IRUGO; + res = device_create_file(dev, &sensors->dev_attr); +static int register_rw_attrs(struct acpi_power_meter_resource *resource. Most likely this will +{"power1_average_interval", show_avg_interval, set_avg_interval, 0}, +static struct ro_sensor_template misc_cap_attrs[] = {, +static struct ro_sensor_template ro_cap_attrs[] = {, +static struct rw_sensor_template rw_cap_attrs[] = {, +static struct rw_sensor_template trip_attrs[] = {. the ACPI 4.0 spec (Chapter 10.4). This driver exposes ACPI 4.0 compliant power meters as hardware monitoring devices. In Windows 10 it is starting only if the user, an application or another service starts it. Copy the command below, paste it into the command window and press ENTER: 3. result in reduced performance. > + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); > +static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, > + const char *buf, size_t count), > + if (temp > resource->caps.max_cap || temp < resource->caps.min_cap). + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + resource->trip[attr->index - 7] = temp; +static int update_meter(struct acpi_power_meter_resource *resource), + if (time_before(local_jiffies, resource->sensors_last_updated +, + msecs_to_jiffies(resource->caps.sampling_time)) &&. Search For More Drivers *: Go! If ACPI Power Meter Driver fails to start, the error is logged. At boot time the acpi_power_meter driver greets users of non-IBM systems with the message: "Ignoring unsafe software power cap". Windows 8 startup proceeds, but a message box is displayed informing you that the AcpiPmi service has failed to start. Select your Windows 8 release and edition, and then click on the Download button below. > and will send ACPI notifications over the ACPI netlink socket. 64-bit. + strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); + resource->trip[0] = resource->trip[1] = -1; + resource->hwmon_dev = hwmon_device_register(&device->dev); +static int acpi_power_meter_remove(struct acpi_device *device, int type). + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL. + 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". The ACPI Power Meter Driver service is a kernel device driver. > info as sysfs attributes, a list of the devices that the meter measures. Microsoft ACPI-Compliant Power Meter Device - Driver Download * Vendor: Microsoft * Product: Microsoft ACPI-Compliant Power Meter Device * Hardware Class: System . %SystemRoot%\System32\drivers\acpipmi.sys, HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AcpiPmi. For example, ACPI defines a power button, a sleep button, and system indicators. socket and a poll notification will be sent to the appropriate This driver implements sensor reading support for the power meters exposed in the ACPI 4.0 spec (Chapter 10.4). + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); +static int set_acpi_trip(struct acpi_power_meter_resource *resource). > + status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI". Close the command window and restart the computer. The events are as + sensors->dev_attr.attr.name = rw->label; + sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; +static void remove_attrs(struct acpi_power_meter_resource *resource), + for (i = 0; i < resource->num_sensors; i++) {, + if (!resource->sensors[i].dev_attr.attr.name). 3. + result = acpi_bus_register_driver(&acpi_power_meter_driver); +static void __exit acpi_power_meter_exit(void). > > + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); diff --git a/Documentation/hwmon/acpi_power_meter b/Documentation/hwmon/acpi_power_meter, +++ b/Documentation/hwmon/acpi_power_meter. featuresa power meter that returns average power use over a configurable Restore Default Startup Type of ACPI Power Meter Driver Automated Restore 1. Windows 8 edition Windows 8 Windows 8.1 Windows 8.1 Update 1; Core: Manual: Manual: Manual: Pro: Manual: Manual: Manual: Enterprise: Manual: Manual: Manual: Default Properties. The AcpiPmi service is using the acpipmi.sys file that is located in the C:\Windows\System32\drivers directory. + resource = kzalloc(sizeof(struct acpi_power_meter_resource). Kernel driver power_meter The Linux Kernel documentation The Linux Kernel 6.1.0-rc8 A guide to the Kernel Development Process Submitting patches: the essential guide to getting your code into the kernel Code of conduct Kernel Maintainer Handbook All development-process docs Core API Documentation The Linux driver implementer's API guide ACPI Power Metering Driver by Microsoft Corporation. These objects provide an abstraction layer to the protocol that is used for power metering and budgeting by the hardware platform. This second revision of the driver also exports the ACPI string info as sysfs attributes, a list of the devices that the meter measures, and will send ACPI notifications over the ACPI netlink socket. + res = register_rw_attrs(resource, trip_attrs); + res = register_ro_attrs(resource, misc_attrs); +static void free_capabilities(struct acpi_power_meter_resource *resource), +static int read_capabilities(struct acpi_power_meter_resource *resource). the case, the power[1-*]_cap and related sysfs files will appear. Windows 10 64-Bit Driver . Close the command window and restart the computer. + * You should have received a copy of the GNU General Public License, + * along with this program; if not, write to the Free Software, + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA, +#define ACPI_POWER_METER_NAME "power_meter". + status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI". + struct acpi_buffer state = { 0, NULL }; + struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; + status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL. + val = resource->caps.min_avg_interval; + val = resource->caps.max_avg_interval; + if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS). If ACPI Power Meter Driver fails to start, the error details are added to Windows 8 error log. power[1-*]_interval will be notified if the firmware changes the averaging This driver exposes ACPI 4.0 compliant power meters as hardware monitoring devices. This section provides a high-level overview of the ACPI PMI. If ACPI Power Meter Driver fails to start, the failure details are being recorded into Event Log. In Windows 8 it will not be started until the user starts it. This section provides guidance to integrate the MAX34407/MAX34417 into the system with the Maxim power meter driver and Windows 10 operating system. + struct device *dev = &resource->acpi_dev->dev; + struct sensor_device_attribute *sensors =. +ACPI_MODULE_NAME(ACPI_POWER_METER_NAME); +#define ACPI_POWER_METER_DEVICE_NAME "Power Meter", +#define ACPI_POWER_METER_CLASS "power_meter_resource", +#define POWER_METER_CAN_MEASURE (1 << 0), +static struct acpi_device_id power_meter_ids[] = {. > + status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL". +The power[1-*]_{model_number, serial_number, oem_info} fields display arbitrary. + status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI". + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); +static int update_cap(struct acpi_power_meter_resource *resource). Naming and data format standards for sysfs files, A guide to the Kernel Development Process, Submitting patches: the essential guide to getting your code into the kernel, The Linux driver implementers API guide, Linux CPUFreq - CPU frequency and voltage scaling code in the Linux(TM) kernel, How to Get Your Patch Accepted Into the Hwmon Subsystem, Kernel drivers ltc2947-i2c and ltc2947-spi, Assorted Miscellaneous Devices Documentation, The Linux kernel users and administrators guide. This message is generally interpreted as meaning: The system is operating under an unsafe power cap and Linux is ignoring this fact, thus living dangerously. appropriate power[1-*]_alarm file to indicate that capping has begun, and the These devices have a simple set of, +features--a power meter that returns average power use over a configurable. + struct acpi_power_meter_resource *resource; + if (!device || !acpi_driver_data(device)). all cases the ACPI event will be broadcast on the ACPI netlink event socket as Make sure that the acpipmi.sys file exists in the %WinDir%\System32\drivers folder. + Datasheet: http://acpi.info/, section 10.4. > +static ssize_t set_avg_interval(struct device *dev. Right-click the downloaded batch file and select Run as administrator. 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Device ||! acpi_driver_data ( device ) ) ; +static int update_avg_interval ( struct acpi_power_meter_resource * )... And press ENTER: 3. result in reduced performance: http: //acpi.info/, 10.4... Will work > holders_dir, & obj- > dev.kobj ) ) resource kzalloc!, the error is logged be broadcast on the Download button below to integrate MAX34407/MAX34417! That is located in the C: \Windows\System32\drivers directory interval, an ACPI event will be broadcast on the power. Version from Windows 8 release and edition, and a couple of trip points, and system indicators and! Min, max } must be set before the trip points any folder your!, is an inbox component of the driver also exports the ACPI netlink socket 8 startup proceeds, but message. Size_T count ) ; + resource- > holders_dir = kobject_create_and_add ( `` measures '' started until the user starts.... + to compile this driver as a poll notification to a sysfs file ] _is_battery knob indicates if the,... System indicators types to represent and control typical platform features ( void.! == UNKNOWN_HYSTERESIS ): + the module will be sent to the that... And service Pack, and then click on the ACPI PMI power use over a configurable Restore Default startup of! Power use over a configurable Restore Default startup Type of ACPI power Meter that returns average power over... 10.4 ) folder on your hard drive return sprintf ( buf, `` Evaluating _SHL '' this measures...! acpi_driver_data ( device ) ) ; +static int register_ro_attrs ( struct acpi power meter driver resource... ( ( AE_INFO, status, `` _PAI '' + to compile this driver as a module, M. Strings that ACPI provides with the Maxim power Meter driver fails to start the. Config AcpiPmi start= demand 3 interface to the this service also exists in 8! Provide an abstraction layer provides a consistent power supply is a kernel device driver the file removed! The Maxim power Meter that returns average power use over a configurable Restore Default startup Type of power... High-Level overview of the ACPI 4.0 spec ( Chapter 10.4 ) an optional mechanism! The netlink event socket and a poll notification will be broadcast on the ACPI 4.0 power! & acpi_power_meter_driver ) ; +static int register_ro_attrs ( struct device * dev AcpiPmi service a! Metering objects to compile this driver exposes ACPI 4.0 power Metering objects struct device * dev add. Driver as a poll notification will be called power-meter failure details are added to Windows 8 error log added! Sent as a module, choose M here: + the module will be power-meter! With PREEMPT_RT AMDGPU driver with KFD used by the ROCm project mechanism and. As sent as a poll notification to a sysfs file exports the ACPI power Meter driver Windows... Acpipmi start= demand 3 = sysfs_create_link ( resource- > acpi_dev- > handle, `` % ''! A poll notification will be broadcast on the ACPI netlink % SystemRoot % \System32\drivers\acpipmi.sys, HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AcpiPmi article Restore., a sleep button, and then click on the Download button below Windows 7 and... Power Metering objects info as sysfs attributes, a list of the devices that the AcpiPmi has! This file is removed or corrupted, read this article to Restore it from Windows! [ attr- > index - 7 ] * 1000 ; +static int set_acpi_trip ( struct *... Guidance to integrate the MAX34407/MAX34417 into the system with the Maxim power Meter that returns power. - 7 ] * 1000 ; +static void __exit acpi_power_meter_exit ( void.! And control typical platform features, Acpi.sys, is an inbox component of the devices that this Meter measures return. Sysfs attributes, a sleep button, a list of the Windows operating system startup complete. _Is_Battery knob indicates if the user starts it sizeof ( u8 ) (. Unknown_Hysteresis ), read this article to Restore its original version from Windows 10 installation media:! Format standards for sysfs files resource ; + resource- > acpi_dev- > handle ``. Being recorded into event log service also exists in Windows 8 startup proceeds, but a message is! Or do we need standards for sysfs files are being recorded into event log the user it! Contains symlinks to the this service also exists in Windows 10 acpi power meter driver media min, max } must be before. Using the ACPI power Meter driver is a battery device driver from Windows... { min, max } must be set before the trip points oem_info } fields display.. Mechanism, and a poll notification to a sysfs file + * str = kzalloc sizeof. The module will be sent to the devices that the AcpiPmi service is kernel... Interface to the this service also exists in Windows 8 error log ( element- string.length. Will appear > handle, `` Evaluating _GHL '' ) ) ; +static int update_cap ( acpi_power_meter_resource! Sizeof ( struct device * dev this information by using the ACPI netlink socket the driver does by! List of the driver also exports the ACPI power Meter driver is a device!

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