1 # SPDX-License-Identifier: GPL-2.0
7 bool "ACPI (Advanced Configuration and Power Interface) Support"
8 depends on !IA64_HP_SIM
9 depends on IA64 || X86 || ARM64
12 default y if (IA64 || X86)
14 Advanced Configuration and Power Interface (ACPI) support for
15 Linux requires an ACPI-compliant platform (hardware/firmware),
16 and assumes the presence of OS-directed configuration and power
17 management (OSPM) software. This option will enlarge your
20 Linux ACPI provides a robust functional replacement for several
21 legacy configuration and power management interfaces, including
22 the Plug-and-Play BIOS specification (PnP BIOS), the
23 MultiProcessor Specification (MPS), and the Advanced Power
24 Management (APM) specification. If both ACPI and APM support
25 are configured, ACPI is used.
27 The project home page for the Linux ACPI subsystem is here:
28 <https://01.org/linux-acpi>
30 Linux support for ACPI is based on Intel Corporation's ACPI
31 Component Architecture (ACPI CA). For more information on the
35 ACPI is an open industry specification originally co-developed by
36 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
37 it is developed by the ACPI Specification Working Group (ASWG) under
38 the UEFI Forum and any UEFI member can join the ASWG and contribute
39 to the ACPI specification.
40 The specification is available at:
41 <http://www.acpi.info>
42 <http://www.uefi.org/acpi/specs>
46 config ACPI_LEGACY_TABLES_LOOKUP
49 config ARCH_MIGHT_HAVE_ACPI_PDC
52 config ACPI_GENERIC_GSI
55 config ACPI_SYSTEM_POWER_STATES_SUPPORT
58 config ACPI_CCA_REQUIRED
62 bool "AML debugger interface"
65 Enable in-kernel debugging of AML facilities: statistics,
66 internal object dump, single step control method execution.
67 This is still under development, currently enabling this only
68 results in the compilation of the ACPICA debugger files.
72 config ACPI_DEBUGGER_USER
73 tristate "Userspace debugger accessiblity"
76 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
77 to access the debugger functionalities.
81 config ACPI_SPCR_TABLE
86 depends on SUSPEND || HIBERNATION
87 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
90 config ACPI_PROCFS_POWER
91 bool "Deprecated power /proc/acpi directories"
92 depends on X86 && PROC_FS
94 For backwards compatibility, this option allows
95 deprecated power /proc/acpi/ directories to exist, even when
96 they have been replaced by functions in /sys.
97 The deprecated directories (and their replacements) include:
98 /proc/acpi/battery/* (/sys/class/power_supply/*)
99 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
100 This option has no effect on /proc/acpi/ directories
101 and functions, which do not yet exist in /sys
102 This option, together with the proc directories, will be
103 deleted in the future.
105 Say N to delete power /proc/acpi/ directories that have moved to /sys/
107 config ACPI_REV_OVERRIDE_POSSIBLE
108 bool "Allow supported ACPI revision to be overridden"
112 The platform firmware on some systems expects Linux to return "5" as
113 the supported ACPI revision which makes it expose system configuration
114 information in a special way.
116 For example, based on what ACPI exports as the supported revision,
117 Dell XPS 13 (2015) configures its audio device to either work in HDA
118 mode or in I2S mode, where the former is supposed to be used on Linux
119 until the latter is fully supported (in the kernel as well as in user
122 This option enables a DMI-based quirk for the above Dell machine (so
123 that HDA audio is exposed by the platform firmware to the kernel) and
124 makes it possible to force the kernel to return "5" as the supported
125 ACPI revision via the "acpi_rev_override" command line switch.
127 config ACPI_EC_DEBUGFS
128 tristate "EC read/write access through /sys/kernel/debug/ec"
131 Say N to disable Embedded Controller /sys/kernel/debug interface
133 Be aware that using this interface can confuse your Embedded
134 Controller in a way that a normal reboot is not enough. You then
135 have to power off your system, and remove the laptop battery for
137 An Embedded Controller typically is available on laptops and reads
138 sensor values like battery state and temperature.
139 The kernel accesses the EC through ACPI parsed code provided by BIOS
140 tables. This option allows to access the EC directly without ACPI
142 Thus this option is a debug option that helps to write ACPI drivers
143 and can be used to identify ACPI code or EC firmware bugs.
146 tristate "AC Adapter"
151 This driver supports the AC Adapter object, which indicates
152 whether a system is on AC or not. If you have a system that can
153 switch between A/C and battery, say Y.
155 To compile this driver as a module, choose M here:
156 the module will be called ac.
164 This driver adds support for battery information through
165 /proc/acpi/battery. If you have a mobile system with a battery,
168 To compile this driver as a module, choose M here:
169 the module will be called battery.
176 This driver handles events on the power, sleep, and lid buttons.
177 A daemon reads events from input devices or via netlink and
178 performs user-defined actions such as shutting down the system.
179 This is necessary for software-controlled poweroff.
181 To compile this driver as a module, choose M here:
182 the module will be called button.
186 depends on X86 && BACKLIGHT_CLASS_DEVICE
190 This driver implements the ACPI Extensions For Display Adapters
191 for integrated graphics devices on motherboard, as specified in
192 ACPI 2.0 Specification, Appendix B. This supports basic operations
193 such as defining the video POST device, retrieving EDID information,
194 and setting up a video output.
196 To compile this driver as a module, choose M here:
197 the module will be called video.
204 This driver supports ACPI fan devices, allowing user-mode
205 applications to perform basic fan control (on, off, status).
207 To compile this driver as a module, choose M here:
208 the module will be called fan.
213 This driver supports ACPI-controlled docking stations and removable
214 drive bays such as the IBM Ultrabay and the Dell Module Bay.
216 config ACPI_CPU_FREQ_PSS
220 config ACPI_PROCESSOR_CSTATE
222 depends on IA64 || X86
224 config ACPI_PROCESSOR_IDLE
233 depends on ACPI_PROCESSOR
237 If this option is enabled, this file implements common functionality
238 to parse CPPC tables as described in the ACPI 5.1+ spec. The
239 routines implemented are meant to be used by other
240 drivers to control CPU performance using CPPC semantics.
241 If your platform does not support CPPC in firmware,
242 leave this option disabled.
244 config ACPI_PROCESSOR
246 depends on X86 || IA64 || ARM64
247 select ACPI_PROCESSOR_IDLE
248 select ACPI_CPU_FREQ_PSS if X86 || IA64
251 This driver adds support for the ACPI Processor package. It is required
252 by several flavors of cpufreq performance-state, thermal, throttling and
255 To compile this driver as a module, choose M here:
256 the module will be called processor.
260 depends on IPMI_HANDLER
263 This driver enables the ACPI to access the BMC controller. And it
264 uses the IPMI request/response message to communicate with BMC
265 controller, which can be found on on the server.
267 To compile this driver as a module, choose M here:
268 the module will be called as acpi_ipmi.
270 config ACPI_HOTPLUG_CPU
272 depends on ACPI_PROCESSOR && HOTPLUG_CPU
273 select ACPI_CONTAINER
276 config ACPI_PROCESSOR_AGGREGATOR
277 tristate "Processor Aggregator"
278 depends on ACPI_PROCESSOR
281 ACPI 4.0 defines processor Aggregator, which enables OS to perform
282 specific processor configuration and control that applies to all
283 processors in the platform. Currently only logical processor idling
284 is defined, which is to reduce power consumption. This driver
285 supports the new device.
288 tristate "Thermal Zone"
289 depends on ACPI_PROCESSOR
293 This driver supports ACPI thermal zones. Most mobile and
294 some desktop systems support ACPI thermal zones. It is HIGHLY
295 recommended that this option be enabled, as your processor(s)
296 may be damaged without it.
298 To compile this driver as a module, choose M here:
299 the module will be called thermal.
304 depends on (X86 || IA64 || ARM64)
305 default y if IA64_GENERIC || IA64_SGI_SN2 || ARM64
307 config ACPI_CUSTOM_DSDT_FILE
308 string "Custom DSDT Table file to include"
310 depends on !STANDALONE
312 This option supports a custom DSDT by linking it into the kernel.
313 See Documentation/acpi/dsdt-override.txt
315 Enter the full path name to the file which includes the AmlCode
318 If unsure, don't enter a file name.
320 config ACPI_CUSTOM_DSDT
322 default ACPI_CUSTOM_DSDT_FILE != ""
324 config ARCH_HAS_ACPI_TABLE_UPGRADE
327 config ACPI_TABLE_UPGRADE
328 bool "Allow upgrading ACPI tables via initrd"
329 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
332 This option provides functionality to upgrade arbitrary ACPI tables
333 via initrd. No functional change if no ACPI tables are passed via
334 initrd, therefore it's safe to say Y.
335 See Documentation/acpi/initrd_table_override.txt for details
338 bool "Debug Statements"
341 The ACPI subsystem can produce debug output. Saying Y enables this
342 output and increases the kernel size by around 50K.
344 Use the acpi.debug_layer and acpi.debug_level kernel command-line
345 parameters documented in Documentation/acpi/debug.txt and
346 Documentation/admin-guide/kernel-parameters.rst to control the type and
347 amount of debug output.
350 bool "PCI slot detection driver"
354 This driver creates entries in /sys/bus/pci/slots/ for all PCI
355 slots in the system. This can help correlate PCI bus addresses,
356 i.e., segment/bus/device/function tuples, with physical slots in
357 the system. If you are unsure, say N.
360 bool "Power Management Timer Support" if EXPERT
364 The Power Management Timer is available on all ACPI-capable,
365 in most cases even if ACPI is unusable or blacklisted.
367 This timing source is not affected by power management features
368 like aggressive processor idling, throttling, frequency and/or
369 voltage scaling, unlike the commonly used Time Stamp Counter
372 You should nearly always say Y here because many modern
373 systems require this timer.
375 config ACPI_CONTAINER
376 bool "Container and Module Devices"
377 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
379 This driver supports ACPI Container and Module devices (IDs
380 ACPI0004, PNP0A05, and PNP0A06).
382 This helps support hotplug of nodes, CPUs, and memory.
384 To compile this driver as a module, choose M here:
385 the module will be called container.
387 config ACPI_HOTPLUG_MEMORY
388 bool "Memory Hotplug"
389 depends on MEMORY_HOTPLUG
391 This driver supports ACPI memory hotplug. The driver
392 fields notifications on ACPI memory devices (PNP0C80),
393 which represent memory ranges that may be onlined or
394 offlined during runtime.
396 If your hardware and firmware do not support adding or
397 removing memory devices at runtime, you need not enable
400 To compile this driver as a module, choose M here:
401 the module will be called acpi_memhotplug.
403 config ACPI_HOTPLUG_IOAPIC
406 depends on X86_IO_APIC
410 tristate "Smart Battery System"
414 This driver supports the Smart Battery System, another
415 type of access to battery information, found on some laptops.
417 To compile this driver as a module, choose M here:
418 the modules will be called sbs and sbshc.
421 tristate "Hardware Error Device"
423 This driver supports the Hardware Error Device (PNP0C33),
424 which is used to report some hardware errors notified via
425 SCI, mainly the corrected errors.
427 config ACPI_CUSTOM_METHOD
428 tristate "Allow ACPI methods to be inserted/replaced at run time"
432 This debug facility allows ACPI AML methods to be inserted and/or
433 replaced without rebooting the system. For details refer to:
434 Documentation/acpi/method-customizing.txt.
436 NOTE: This option is security sensitive, because it allows arbitrary
437 kernel memory to be written to by root (uid=0) users, allowing them
438 to bypass certain security measures (e.g. if root is not allowed to
439 load additional kernel modules after boot, this feature may be used
440 to override that restriction).
443 bool "Boottime Graphics Resource Table support"
444 depends on EFI && (X86 || ARM64)
446 This driver adds support for exposing the ACPI Boottime Graphics
447 Resource Table, which allows the operating system to obtain
448 data from the firmware boot splash. It will appear under
449 /sys/firmware/acpi/bgrt/ .
451 config ACPI_REDUCED_HARDWARE_ONLY
452 bool "Hardware-reduced ACPI support only" if EXPERT
455 This config item changes the way the ACPI code is built. When this
456 option is selected, the kernel will use a specialized version of
457 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
458 resulting kernel will be smaller but it will also be restricted to
459 running in ACPI reduced hardware mode ONLY.
461 If you are unsure what to do, do not enable this option.
463 source "drivers/acpi/nfit/Kconfig"
465 source "drivers/acpi/apei/Kconfig"
466 source "drivers/acpi/dptf/Kconfig"
472 tristate "Extended Error Log support"
473 depends on X86_MCE && X86_LOCAL_APIC && EDAC
477 Certain usages such as Predictive Failure Analysis (PFA) require
478 more information about the error than what can be described in
479 processor machine check banks. Most server processors log
480 additional information about the error in processor uncore
481 registers. Since the addresses and layout of these registers vary
482 widely from one processor to another, system software cannot
483 readily make use of them. To complicate matters further, some of
484 the additional error information cannot be constructed without
485 detailed knowledge about platform topology.
487 Enhanced MCA Logging allows firmware to provide additional error
488 information to system software, synchronous with MCE or CMCI. This
489 driver adds support for that functionality with corresponding
490 tracepoint which carries that information to userspace.
492 menuconfig PMIC_OPREGION
493 bool "PMIC (Power Management Integrated Circuit) operation region support"
495 Select this option to enable support for ACPI operation
496 region of the PMIC chip. The operation region can be used
497 to control power rails and sensor reading/writing on the
501 config CRC_PMIC_OPREGION
502 bool "ACPI operation region support for CrystalCove PMIC"
503 depends on INTEL_SOC_PMIC
505 This config adds ACPI operation region support for CrystalCove PMIC.
507 config XPOWER_PMIC_OPREGION
508 bool "ACPI operation region support for XPower AXP288 PMIC"
509 depends on MFD_AXP20X_I2C
511 This config adds ACPI operation region support for XPower AXP288 PMIC.
513 config BXT_WC_PMIC_OPREGION
514 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
515 depends on INTEL_SOC_PMIC_BXTWC
517 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
519 config CHT_WC_PMIC_OPREGION
520 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
521 depends on INTEL_SOC_PMIC_CHTWC
523 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
528 tristate "ACPI configfs support"
531 Select this option to enable support for ACPI configuration from
532 userspace. The configurable ACPI groups will be visible under
533 /config/acpi, assuming configfs is mounted under /config.
536 source "drivers/acpi/arm64/Kconfig"
539 config TPS68470_PMIC_OPREGION
540 bool "ACPI operation region support for TPS68470 PMIC"
541 depends on MFD_TPS68470
543 This config adds ACPI operation region support for TI TPS68470 PMIC.
544 TPS68470 device is an advanced power management unit that powers
545 a Compact Camera Module (CCM), generates clocks for image sensors,
546 drives a dual LED for flash and incorporates two LED drivers for
547 general purpose indicators.
548 This driver enables ACPI operation region support control voltage
549 regulators and clocks.
551 This option is a bool as it provides an ACPI operation
552 region, which must be available before any of the devices
553 using this, are probed.