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Diffstat (limited to 'Documentation/hwmon/acpi_power_meter')
-rw-r--r-- | Documentation/hwmon/acpi_power_meter | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/Documentation/hwmon/acpi_power_meter b/Documentation/hwmon/acpi_power_meter deleted file mode 100644 index c80399a00c50..000000000000 --- a/Documentation/hwmon/acpi_power_meter +++ /dev/null @@ -1,51 +0,0 @@ -Kernel driver power_meter -========================= - -This driver talks to ACPI 4.0 power meters. - -Supported systems: - * Any recent system with ACPI 4.0. - Prefix: 'power_meter' - Datasheet: http://acpi.info/, section 10.4. - -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). 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. The -sysfs interface conforms with the specification outlined in the "Power" section -of Documentation/hwmon/sysfs-interface. - -Special Features ----------------- - -The power[1-*]_is_battery knob indicates if the power supply is a battery. -Both power[1-*]_average_{min,max} must be set before the trip points will work. -When both of them are set, an ACPI event will be broadcast on the ACPI netlink -socket and a poll notification will be sent to the appropriate -power[1-*]_average sysfs file. - -The power[1-*]_{model_number, serial_number, oem_info} fields display arbitrary -strings that ACPI provides with the meter. The measures/ directory contains -symlinks to the devices that this meter measures. - -Some computers have the ability to enforce a power cap in hardware. If this is -the case, the power[1-*]_cap and related sysfs files will appear. When the -average power consumption exceeds the cap, an ACPI event will be broadcast on -the netlink event socket and a poll notification will be sent to the -appropriate power[1-*]_alarm file to indicate that capping has begun, and the -hardware has taken action to reduce power consumption. Most likely this will -result in reduced performance. - -There are a few other ACPI notifications that can be sent by the firmware. In -all cases the ACPI event will be broadcast on the ACPI netlink event socket as -well as sent as a poll notification to a sysfs file. The events are as -follows: - -power[1-*]_cap will be notified if the firmware changes the power cap. -power[1-*]_interval will be notified if the firmware changes the averaging -interval. |