1 # SPDX-License-Identifier: GPL-2.0
6 config ARCH_SUPPORTS_ACPI
10 bool "ACPI (Advanced Configuration and Power Interface) Support"
11 depends on ARCH_SUPPORTS_ACPI
16 Advanced Configuration and Power Interface (ACPI) support for
17 Linux requires an ACPI-compliant platform (hardware/firmware),
18 and assumes the presence of OS-directed configuration and power
19 management (OSPM) software. This option will enlarge your
22 Linux ACPI provides a robust functional replacement for several
23 legacy configuration and power management interfaces, including
24 the Plug-and-Play BIOS specification (PnP BIOS), the
25 MultiProcessor Specification (MPS), and the Advanced Power
26 Management (APM) specification. If both ACPI and APM support
27 are configured, ACPI is used.
29 The project home page for the Linux ACPI subsystem is here:
30 <https://01.org/linux-acpi>
32 Linux support for ACPI is based on Intel Corporation's ACPI
33 Component Architecture (ACPI CA). For more information on the
37 ACPI is an open industry specification originally co-developed by
38 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
39 it is developed by the ACPI Specification Working Group (ASWG) under
40 the UEFI Forum and any UEFI member can join the ASWG and contribute
41 to the ACPI specification.
42 The specification is available at:
43 <http://www.acpi.info>
44 <http://www.uefi.org/acpi/specs>
48 config ACPI_LEGACY_TABLES_LOOKUP
51 config ARCH_MIGHT_HAVE_ACPI_PDC
54 config ACPI_GENERIC_GSI
57 config ACPI_SYSTEM_POWER_STATES_SUPPORT
60 config ACPI_CCA_REQUIRED
64 bool "AML debugger interface"
67 Enable in-kernel debugging of AML facilities: statistics,
68 internal object dump, single step control method execution.
69 This is still under development, currently enabling this only
70 results in the compilation of the ACPICA debugger files.
74 config ACPI_DEBUGGER_USER
75 tristate "Userspace debugger accessiblity"
78 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
79 to access the debugger functionalities.
83 config ACPI_SPCR_TABLE
93 depends on SUSPEND || HIBERNATION
94 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
97 config ACPI_PROCFS_POWER
98 bool "Deprecated power /proc/acpi directories"
99 depends on X86 && PROC_FS
101 For backwards compatibility, this option allows
102 deprecated power /proc/acpi/ directories to exist, even when
103 they have been replaced by functions in /sys.
104 The deprecated directories (and their replacements) include:
105 /proc/acpi/battery/* (/sys/class/power_supply/*)
106 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
107 This option has no effect on /proc/acpi/ directories
108 and functions, which do not yet exist in /sys
109 This option, together with the proc directories, will be
110 deleted in the future.
112 Say N to delete power /proc/acpi/ directories that have moved to /sys/
114 config ACPI_REV_OVERRIDE_POSSIBLE
115 bool "Allow supported ACPI revision to be overridden"
119 The platform firmware on some systems expects Linux to return "5" as
120 the supported ACPI revision which makes it expose system configuration
121 information in a special way.
123 For example, based on what ACPI exports as the supported revision,
124 Dell XPS 13 (2015) configures its audio device to either work in HDA
125 mode or in I2S mode, where the former is supposed to be used on Linux
126 until the latter is fully supported (in the kernel as well as in user
129 This option enables a DMI-based quirk for the above Dell machine (so
130 that HDA audio is exposed by the platform firmware to the kernel) and
131 makes it possible to force the kernel to return "5" as the supported
132 ACPI revision via the "acpi_rev_override" command line switch.
134 config ACPI_EC_DEBUGFS
135 tristate "EC read/write access through /sys/kernel/debug/ec"
138 Say N to disable Embedded Controller /sys/kernel/debug interface
140 Be aware that using this interface can confuse your Embedded
141 Controller in a way that a normal reboot is not enough. You then
142 have to power off your system, and remove the laptop battery for
144 An Embedded Controller typically is available on laptops and reads
145 sensor values like battery state and temperature.
146 The kernel accesses the EC through ACPI parsed code provided by BIOS
147 tables. This option allows to access the EC directly without ACPI
149 Thus this option is a debug option that helps to write ACPI drivers
150 and can be used to identify ACPI code or EC firmware bugs.
153 tristate "AC Adapter"
158 This driver supports the AC Adapter object, which indicates
159 whether a system is on AC or not. If you have a system that can
160 switch between A/C and battery, say Y.
162 To compile this driver as a module, choose M here:
163 the module will be called ac.
171 This driver adds support for battery information through
172 /proc/acpi/battery. If you have a mobile system with a battery,
175 To compile this driver as a module, choose M here:
176 the module will be called battery.
183 This driver handles events on the power, sleep, and lid buttons.
184 A daemon reads events from input devices or via netlink and
185 performs user-defined actions such as shutting down the system.
186 This is necessary for software-controlled poweroff.
188 To compile this driver as a module, choose M here:
189 the module will be called button.
193 depends on X86 && BACKLIGHT_CLASS_DEVICE
197 This driver implements the ACPI Extensions For Display Adapters
198 for integrated graphics devices on motherboard, as specified in
199 ACPI 2.0 Specification, Appendix B. This supports basic operations
200 such as defining the video POST device, retrieving EDID information,
201 and setting up a video output.
203 To compile this driver as a module, choose M here:
204 the module will be called video.
211 This driver supports ACPI fan devices, allowing user-mode
212 applications to perform basic fan control (on, off, status).
214 To compile this driver as a module, choose M here:
215 the module will be called fan.
220 This driver supports ACPI-controlled docking stations and removable
221 drive bays such as the IBM Ultrabay and the Dell Module Bay.
223 config ACPI_CPU_FREQ_PSS
227 config ACPI_PROCESSOR_CSTATE
229 depends on IA64 || X86
231 config ACPI_PROCESSOR_IDLE
240 depends on ACPI_PROCESSOR
244 If this option is enabled, this file implements common functionality
245 to parse CPPC tables as described in the ACPI 5.1+ spec. The
246 routines implemented are meant to be used by other
247 drivers to control CPU performance using CPPC semantics.
248 If your platform does not support CPPC in firmware,
249 leave this option disabled.
251 config ACPI_PROCESSOR
253 depends on X86 || IA64 || ARM64
254 select ACPI_PROCESSOR_IDLE
255 select ACPI_CPU_FREQ_PSS if X86 || IA64
258 This driver adds support for the ACPI Processor package. It is required
259 by several flavors of cpufreq performance-state, thermal, throttling and
262 To compile this driver as a module, choose M here:
263 the module will be called processor.
267 depends on IPMI_HANDLER
270 This driver enables the ACPI to access the BMC controller. And it
271 uses the IPMI request/response message to communicate with BMC
272 controller, which can be found on on the server.
274 To compile this driver as a module, choose M here:
275 the module will be called as acpi_ipmi.
277 config ACPI_HOTPLUG_CPU
279 depends on ACPI_PROCESSOR && HOTPLUG_CPU
280 select ACPI_CONTAINER
283 config ACPI_PROCESSOR_AGGREGATOR
284 tristate "Processor Aggregator"
285 depends on ACPI_PROCESSOR
288 ACPI 4.0 defines processor Aggregator, which enables OS to perform
289 specific processor configuration and control that applies to all
290 processors in the platform. Currently only logical processor idling
291 is defined, which is to reduce power consumption. This driver
292 supports the new device.
295 tristate "Thermal Zone"
296 depends on ACPI_PROCESSOR
300 This driver supports ACPI thermal zones. Most mobile and
301 some desktop systems support ACPI thermal zones. It is HIGHLY
302 recommended that this option be enabled, as your processor(s)
303 may be damaged without it.
305 To compile this driver as a module, choose M here:
306 the module will be called thermal.
311 depends on (X86 || IA64 || ARM64)
312 default y if IA64_GENERIC || IA64_SGI_SN2 || ARM64
314 config ACPI_CUSTOM_DSDT_FILE
315 string "Custom DSDT Table file to include"
317 depends on !STANDALONE
319 This option supports a custom DSDT by linking it into the kernel.
320 See Documentation/acpi/dsdt-override.txt
322 Enter the full path name to the file which includes the AmlCode
325 If unsure, don't enter a file name.
327 config ACPI_CUSTOM_DSDT
329 default ACPI_CUSTOM_DSDT_FILE != ""
331 config ARCH_HAS_ACPI_TABLE_UPGRADE
334 config ACPI_TABLE_UPGRADE
335 bool "Allow upgrading ACPI tables via initrd"
336 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
339 This option provides functionality to upgrade arbitrary ACPI tables
340 via initrd. No functional change if no ACPI tables are passed via
341 initrd, therefore it's safe to say Y.
342 See Documentation/acpi/initrd_table_override.txt for details
345 bool "Debug Statements"
348 The ACPI subsystem can produce debug output. Saying Y enables this
349 output and increases the kernel size by around 50K.
351 Use the acpi.debug_layer and acpi.debug_level kernel command-line
352 parameters documented in Documentation/acpi/debug.txt and
353 Documentation/admin-guide/kernel-parameters.rst to control the type and
354 amount of debug output.
357 bool "PCI slot detection driver"
361 This driver creates entries in /sys/bus/pci/slots/ for all PCI
362 slots in the system. This can help correlate PCI bus addresses,
363 i.e., segment/bus/device/function tuples, with physical slots in
364 the system. If you are unsure, say N.
367 bool "Power Management Timer Support" if EXPERT
371 The Power Management Timer is available on all ACPI-capable,
372 in most cases even if ACPI is unusable or blacklisted.
374 This timing source is not affected by power management features
375 like aggressive processor idling, throttling, frequency and/or
376 voltage scaling, unlike the commonly used Time Stamp Counter
379 You should nearly always say Y here because many modern
380 systems require this timer.
382 config ACPI_CONTAINER
383 bool "Container and Module Devices"
384 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
386 This driver supports ACPI Container and Module devices (IDs
387 ACPI0004, PNP0A05, and PNP0A06).
389 This helps support hotplug of nodes, CPUs, and memory.
391 To compile this driver as a module, choose M here:
392 the module will be called container.
394 config ACPI_HOTPLUG_MEMORY
395 bool "Memory Hotplug"
396 depends on MEMORY_HOTPLUG
398 This driver supports ACPI memory hotplug. The driver
399 fields notifications on ACPI memory devices (PNP0C80),
400 which represent memory ranges that may be onlined or
401 offlined during runtime.
403 If your hardware and firmware do not support adding or
404 removing memory devices at runtime, you need not enable
407 To compile this driver as a module, choose M here:
408 the module will be called acpi_memhotplug.
410 config ACPI_HOTPLUG_IOAPIC
413 depends on X86_IO_APIC
417 tristate "Smart Battery System"
421 This driver supports the Smart Battery System, another
422 type of access to battery information, found on some laptops.
424 To compile this driver as a module, choose M here:
425 the modules will be called sbs and sbshc.
428 tristate "Hardware Error Device"
430 This driver supports the Hardware Error Device (PNP0C33),
431 which is used to report some hardware errors notified via
432 SCI, mainly the corrected errors.
434 config ACPI_CUSTOM_METHOD
435 tristate "Allow ACPI methods to be inserted/replaced at run time"
439 This debug facility allows ACPI AML methods to be inserted and/or
440 replaced without rebooting the system. For details refer to:
441 Documentation/acpi/method-customizing.txt.
443 NOTE: This option is security sensitive, because it allows arbitrary
444 kernel memory to be written to by root (uid=0) users, allowing them
445 to bypass certain security measures (e.g. if root is not allowed to
446 load additional kernel modules after boot, this feature may be used
447 to override that restriction).
450 bool "Boottime Graphics Resource Table support"
451 depends on EFI && (X86 || ARM64)
453 This driver adds support for exposing the ACPI Boottime Graphics
454 Resource Table, which allows the operating system to obtain
455 data from the firmware boot splash. It will appear under
456 /sys/firmware/acpi/bgrt/ .
458 config ACPI_REDUCED_HARDWARE_ONLY
459 bool "Hardware-reduced ACPI support only" if EXPERT
462 This config item changes the way the ACPI code is built. When this
463 option is selected, the kernel will use a specialized version of
464 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
465 resulting kernel will be smaller but it will also be restricted to
466 running in ACPI reduced hardware mode ONLY.
468 If you are unsure what to do, do not enable this option.
470 source "drivers/acpi/nfit/Kconfig"
472 source "drivers/acpi/apei/Kconfig"
473 source "drivers/acpi/dptf/Kconfig"
479 tristate "Extended Error Log support"
480 depends on X86_MCE && X86_LOCAL_APIC && EDAC
484 Certain usages such as Predictive Failure Analysis (PFA) require
485 more information about the error than what can be described in
486 processor machine check banks. Most server processors log
487 additional information about the error in processor uncore
488 registers. Since the addresses and layout of these registers vary
489 widely from one processor to another, system software cannot
490 readily make use of them. To complicate matters further, some of
491 the additional error information cannot be constructed without
492 detailed knowledge about platform topology.
494 Enhanced MCA Logging allows firmware to provide additional error
495 information to system software, synchronous with MCE or CMCI. This
496 driver adds support for that functionality with corresponding
497 tracepoint which carries that information to userspace.
499 menuconfig PMIC_OPREGION
500 bool "PMIC (Power Management Integrated Circuit) operation region support"
502 Select this option to enable support for ACPI operation
503 region of the PMIC chip. The operation region can be used
504 to control power rails and sensor reading/writing on the
508 config CRC_PMIC_OPREGION
509 bool "ACPI operation region support for CrystalCove PMIC"
510 depends on INTEL_SOC_PMIC
512 This config adds ACPI operation region support for CrystalCove PMIC.
514 config XPOWER_PMIC_OPREGION
515 bool "ACPI operation region support for XPower AXP288 PMIC"
516 depends on MFD_AXP20X_I2C
518 This config adds ACPI operation region support for XPower AXP288 PMIC.
520 config BXT_WC_PMIC_OPREGION
521 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
522 depends on INTEL_SOC_PMIC_BXTWC
524 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
526 config CHT_WC_PMIC_OPREGION
527 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
528 depends on INTEL_SOC_PMIC_CHTWC
530 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
532 config CHT_DC_TI_PMIC_OPREGION
533 bool "ACPI operation region support for Dollar Cove TI PMIC"
534 depends on INTEL_SOC_PMIC_CHTDC_TI
536 This config adds ACPI operation region support for Dollar Cove TI PMIC.
541 tristate "ACPI configfs support"
544 Select this option to enable support for ACPI configuration from
545 userspace. The configurable ACPI groups will be visible under
546 /config/acpi, assuming configfs is mounted under /config.
549 source "drivers/acpi/arm64/Kconfig"
555 config TPS68470_PMIC_OPREGION
556 bool "ACPI operation region support for TPS68470 PMIC"
557 depends on MFD_TPS68470
559 This config adds ACPI operation region support for TI TPS68470 PMIC.
560 TPS68470 device is an advanced power management unit that powers
561 a Compact Camera Module (CCM), generates clocks for image sensors,
562 drives a dual LED for flash and incorporates two LED drivers for
563 general purpose indicators.
564 This driver enables ACPI operation region support control voltage
565 regulators and clocks.
567 This option is a bool as it provides an ACPI operation
568 region, which must be available before any of the devices
569 using this, are probed.