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ACPI_HP(4)			   BSD Kernel Interfaces Manual 		       ACPI_HP(4)

NAME
     acpi_hp -- ACPI extras driver for HP laptops

SYNOPSIS
     To compile this driver into the kernel, place the following line in your kernel configura-
     tion file:

	   device acpi_hp

     Alternatively, to load the driver as a module at boot time, place the following line in
     loader.conf(5):

	   acpi_hp_load="YES"

DESCRIPTION
     The acpi_hp driver provides support for ACPI-controlled features found on HP laptops that
     use a WMI enabled BIOS (e.g. HP Compaq 8510p and 6510p).

     The main purpose of this driver is to provide an interface, accessible via sysctl(8),
     devd(8) and devfs(8), through which applications can determine and change the status of var-
     ious laptop components and BIOS settings.

   devd(8) Events
     Devd events received by devd(8) provide the following information:

	   system     "ACPI"
	   subsystem  "HP"
	   type       The source of the event in the ACPI namespace.  The value depends on the
		      model.
	   notify     Event code (see below).

     Event codes:

	   0xc0  WLAN on air status changed to 0 (not on air)
	   0xc1  WLAN on air status changed to 1 (on air)
	   0xd0  Bluetooth on air status changed to 0 (not on air)
	   0xd1  Bluetooth on air status changed to 1 (on air)
	   0xe0  WWAN on air status changed to 0 (not on air)
	   0xe1  WWAN on air status changed to 1 (on air)

   devfs(8) Device
     You can read /dev/hpcmi to see your current BIOS settings.  The detail level can be adjusted
     by setting the sysctl cmi_detail as described below.

SYSCTL VARIABLES
     The following sysctls are currently implemented:

   WLAN:
     dev.acpi_hp.0.wlan_enabled
	     Toggle WLAN chip activity.

     dev.acpi_hp.0.wlan_radio
	     (read-only) WLAN radio status (controlled by hardware switch)

     dev.acpi_hp.0.wlan_on_air
	     (read-only) WLAN on air (chip enabled, hardware switch enabled + enabled in BIOS)

     dev.acpi_hp.0.wlan_enabled_if_radio_on
	     If set to 1, the WLAN chip will be enabled if the radio is turned on

     dev.acpi_hp.0.wlan_disable_if_radio_off
	     If set to 1, the WLAN chip will be disabled if the radio is turned off

   Bluetooth:
     dev.acpi_hp.0.bt_enabled
	     Toggle Bluetooth chip activity.

     dev.acpi_hp.0.bt_radio
	     (read-only) Bluetooth radio status (controlled by hardware switch)

     dev.acpi_hp.0.bt_on_air
	     (read-only) Bluetooth on air (chip enabled, hardware switch enabled + enabled in
	     BIOS)

     dev.acpi_hp.0.bt_enabled_if_radio_on
	     If set to 1, the Bluetooth chip will be enabled if the radio is turned on

     dev.acpi_hp.0.bt_disable_if_radio_off
	     If set to 1, the Bluetooth chip will be disabled if the radio is turned off

   WWAN:
     dev.acpi_hp.0.wwan_enabled
	     Toggle WWAN chip activity.

     dev.acpi_hp.0.wwan_radio
	     (read-only) WWAN radio status (controlled by hardware switch)

     dev.acpi_hp.0.wwan_on_air
	     (read-only) WWAN on air (chip enabled, hardware switch enabled + enabled in BIOS)

     dev.acpi_hp.0.wwan_enabled_if_radio_on
	     If set to 1, the WWAN chip will be enabled if the radio is turned on

     dev.acpi_hp.0.wwan_disable_if_radio_off
	     If set to 1, the WWAN chip will be disabled if the radio is turned off

   Misc:
     dev.acpi_hp.0.als_enabled
	     Toggle ambient light sensor (ALS)

     dev.acpi_hp.0.display
	     (read-only) Display status (bitmask)

     dev.acpi_hp.0.hdd_temperature
	     (read-only) HDD temperature

     dev.acpi_hp.0.is_docked
	     (read-only) Docking station status (1 if docked)

     dev.acpi_hp.0.cmi_detail
	     Bitmask to control detail level in /dev/hpcmi output (values can be ORed).
		   0x01  Show path component of BIOS setting
		   0x02  Show a list of valid options for the BIOS setting
		   0x04  Show additional flags of BIOS setting (ReadOnly etc.)
		   0x08  Query highest BIOS entry instance.  This is broken on many HP models and
			 therefore disabled by default.

     dev.acpi_hp.0.verbose
	     (read-only) Set verbosity level

     Defaults for these sysctls can be set in sysctl.conf(5).

HARDWARE
     The acpi_hp driver has been reported to support the following hardware:

     o	 HP Compaq 8510p
     o	 HP Compaq nx7300

     It should work on most HP laptops that feature a WMI enabled BIOS.

FILES
     /dev/hpcmi  Interface to read BIOS settings

EXAMPLES
     The following can be added to devd.conf(5) in order disable the LAN interface when WLAN on
     air and reenable if it's not:

	   notify 0 {
		   match "system"	   "ACPI";
		   match "subsystem"	   "HP";
		   match "notify"	   "0xc0";
		   action		   "ifconfig em0 up";
	   };

	   notify 0 {
		   match "system"	   "ACPI";
		   match "subsystem"	   "HP";
		   match "notify"	   "0xc1";
		   action		   "ifconfig em0 down";
	   };

     Enable the ambient light sensor:

	   sysctl dev.acpi_hp.0.als_enabled=1

     Enable Bluetooth:

	   sysctl dev.acpi_hp.0.bt_enabled=1

     Get BIOS settings:

	   cat /dev/hpcmi

	   Serial Port				      Disable
	   Infrared Port			      Enable
	   Parallel Port			      Disable
	   Flash Media Reader			      Disable
	   USB Ports including Express Card slot      Enable
	   1394 Port				      Enable
	   Cardbus Slot 			      Disable
	   Express Card Slot			      Disable
	   (...)

     Set maximum detail level for /dev/hpcmi output:

	   sysctl dev.acpi_hp.0.cmi_detail=7

SEE ALSO
     acpi(4), acpi_wmi(4), sysctl.conf(5), devd(8), devfs(8), sysctl(8)

HISTORY
     The acpi_hp device driver first appeared in FreeBSD 8.0.

AUTHORS
     The acpi_hp driver was written by Michael Gmelin <freebsd@grem.de>.

     It has been inspired by hp-wmi driver, which implements a subset of these features (hotkeys)
     on Linux.

     HP CMI whitepaper:
	     http://h20331.www2.hp.com/Hpsub/downloads/cmi_whitepaper.pdf

     wmi-hp for Linux:
	     http://www.kernel.org

     WMI and ACPI:
	     http://www.microsoft.com/whdc/system/pnppwr/wmi/wmi-acpi.mspx

     This manual page was written by Michael Gmelin <freebsd@grem.de>.

BUGS
     This driver is experimental and has only been tested on i386 on an HP Compaq 8510p which
     featured all supported wireless devices (WWAN/BT/WLAN).  Expect undefined results when oper-
     ating on different hardware.

     Loading the driver is slow. Reading from /dev/hpcmi is even slower.

     Additional features like HP specific sensor readings or writing BIOS settings are not sup-
     ported.

BSD					 February 8, 2010				      BSD
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