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1# SPDX-License-Identifier: GPL-2.0
2#
3# ACPI Configuration
4#
5
6config ARCH_SUPPORTS_ACPI
7 bool
8
9menuconfig ACPI
10 bool "ACPI (Advanced Configuration and Power Interface) Support"
11 depends on ARCH_SUPPORTS_ACPI
12 select PNP
13 select NLS
14 default y if X86
15 help
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
20 kernel by about 70K.
21
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.
28
29 The project home page for the Linux ACPI subsystem is here:
30 <https://01.org/linux-acpi>
31
32 Linux support for ACPI is based on Intel Corporation's ACPI
33 Component Architecture (ACPI CA). For more information on the
34 ACPI CA, see:
35 <https://acpica.org/>
36
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 <https://uefi.org/specifications>
44
45if ACPI
46
47config ACPI_LEGACY_TABLES_LOOKUP
48 bool
49
50config ARCH_MIGHT_HAVE_ACPI_PDC
51 bool
52
53config ACPI_GENERIC_GSI
54 bool
55
56config ACPI_SYSTEM_POWER_STATES_SUPPORT
57 bool
58
59config ACPI_CCA_REQUIRED
60 bool
61
62config ACPI_DEBUGGER
63 bool "AML debugger interface"
64 select ACPI_DEBUG
65 help
66 Enable in-kernel debugging of AML facilities: statistics,
67 internal object dump, single step control method execution.
68 This is still under development, currently enabling this only
69 results in the compilation of the ACPICA debugger files.
70
71if ACPI_DEBUGGER
72
73config ACPI_DEBUGGER_USER
74 tristate "Userspace debugger accessiblity"
75 depends on DEBUG_FS
76 help
77 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
78 to access the debugger functionalities.
79
80endif
81
82config ACPI_SPCR_TABLE
83 bool "ACPI Serial Port Console Redirection Support"
84 default y if X86
85 help
86 Enable support for Serial Port Console Redirection (SPCR) Table.
87 This table provides information about the configuration of the
88 earlycon console.
89
90config ACPI_LPIT
91 bool
92 depends on X86_64
93 default y
94
95config ACPI_SLEEP
96 bool
97 depends on SUSPEND || HIBERNATION
98 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
99 default y
100
101config ACPI_REV_OVERRIDE_POSSIBLE
102 bool "Allow supported ACPI revision to be overridden"
103 depends on X86
104 default y
105 help
106 The platform firmware on some systems expects Linux to return "5" as
107 the supported ACPI revision which makes it expose system configuration
108 information in a special way.
109
110 For example, based on what ACPI exports as the supported revision,
111 Dell XPS 13 (2015) configures its audio device to either work in HDA
112 mode or in I2S mode, where the former is supposed to be used on Linux
113 until the latter is fully supported (in the kernel as well as in user
114 space).
115
116 This option enables a DMI-based quirk for the above Dell machine (so
117 that HDA audio is exposed by the platform firmware to the kernel) and
118 makes it possible to force the kernel to return "5" as the supported
119 ACPI revision via the "acpi_rev_override" command line switch.
120
121config ACPI_EC_DEBUGFS
122 tristate "EC read/write access through /sys/kernel/debug/ec"
123 help
124 Say N to disable Embedded Controller /sys/kernel/debug interface
125
126 Be aware that using this interface can confuse your Embedded
127 Controller in a way that a normal reboot is not enough. You then
128 have to power off your system, and remove the laptop battery for
129 some seconds.
130 An Embedded Controller typically is available on laptops and reads
131 sensor values like battery state and temperature.
132 The kernel accesses the EC through ACPI parsed code provided by BIOS
133 tables. This option allows to access the EC directly without ACPI
134 code being involved.
135 Thus this option is a debug option that helps to write ACPI drivers
136 and can be used to identify ACPI code or EC firmware bugs.
137
138config ACPI_AC
139 tristate "AC Adapter"
140 select POWER_SUPPLY
141 default y
142 help
143 This driver supports the AC Adapter object, which indicates
144 whether a system is on AC or not. If you have a system that can
145 switch between A/C and battery, say Y.
146
147 To compile this driver as a module, choose M here:
148 the module will be called ac.
149
150config ACPI_BATTERY
151 tristate "Battery"
152 select POWER_SUPPLY
153 default y
154 help
155 This driver adds support for battery information through
156 /proc/acpi/battery. If you have a mobile system with a battery,
157 say Y.
158
159 To compile this driver as a module, choose M here:
160 the module will be called battery.
161
162config ACPI_BUTTON
163 tristate "Button"
164 depends on INPUT
165 default y
166 help
167 This driver handles events on the power, sleep, and lid buttons.
168 A daemon reads events from input devices or via netlink and
169 performs user-defined actions such as shutting down the system.
170 This is necessary for software-controlled poweroff.
171
172 To compile this driver as a module, choose M here:
173 the module will be called button.
174
175config ACPI_TINY_POWER_BUTTON
176 tristate "Tiny Power Button Driver"
177 depends on !ACPI_BUTTON
178 help
179 This driver provides a tiny alternative to the ACPI Button driver.
180 The tiny power button driver only handles the power button. Rather
181 than notifying userspace via the input layer or a netlink event, this
182 driver directly signals the init process to shut down.
183
184 This driver is particularly suitable for cloud and VM environments,
185 which use a simulated power button to initiate a controlled poweroff,
186 but which may not want to run a separate userspace daemon to process
187 input events.
188
189config ACPI_TINY_POWER_BUTTON_SIGNAL
190 int "Tiny Power Button Signal"
191 depends on ACPI_TINY_POWER_BUTTON
192 default 38
193 help
194 Default signal to send to init in response to the power button.
195
196 Likely values here include 38 (SIGRTMIN+4) to power off, or 2
197 (SIGINT) to simulate Ctrl+Alt+Del.
198
199config ACPI_VIDEO
200 tristate "Video"
201 depends on X86 && BACKLIGHT_CLASS_DEVICE
202 depends on INPUT
203 select THERMAL
204 help
205 This driver implements the ACPI Extensions For Display Adapters
206 for integrated graphics devices on motherboard, as specified in
207 ACPI 2.0 Specification, Appendix B. This supports basic operations
208 such as defining the video POST device, retrieving EDID information,
209 and setting up a video output.
210
211 To compile this driver as a module, choose M here:
212 the module will be called video.
213
214config ACPI_FAN
215 tristate "Fan"
216 depends on THERMAL
217 default y
218 help
219 This driver supports ACPI fan devices, allowing user-mode
220 applications to perform basic fan control (on, off, status).
221
222 To compile this driver as a module, choose M here:
223 the module will be called fan.
224
225config ACPI_TAD
226 tristate "ACPI Time and Alarm (TAD) Device Support"
227 depends on SYSFS && PM_SLEEP
228 help
229 The ACPI Time and Alarm (TAD) device is an alternative to the Real
230 Time Clock (RTC). Its wake timers allow the system to transition from
231 the S3 (or optionally S4/S5) state to S0 state after a time period
232 elapses. In comparison with the RTC Alarm, the TAD provides a larger
233 scale of flexibility in the wake timers. The time capabilities of the
234 TAD maintain the time of day information across platform power
235 transitions, and keep track of time even when the platform is turned
236 off.
237
238config ACPI_DOCK
239 bool "Dock"
240 help
241 This driver supports ACPI-controlled docking stations and removable
242 drive bays such as the IBM Ultrabay and the Dell Module Bay.
243
244config ACPI_CPU_FREQ_PSS
245 bool
246 select THERMAL
247
248config ACPI_PROCESSOR_CSTATE
249 def_bool y
250 depends on ACPI_PROCESSOR
251 depends on IA64 || X86
252
253config ACPI_PROCESSOR_IDLE
254 bool
255 select CPU_IDLE
256
257config ACPI_MCFG
258 bool
259
260config ACPI_CPPC_LIB
261 bool
262 depends on ACPI_PROCESSOR
263 select MAILBOX
264 select PCC
265 help
266 If this option is enabled, this file implements common functionality
267 to parse CPPC tables as described in the ACPI 5.1+ spec. The
268 routines implemented are meant to be used by other
269 drivers to control CPU performance using CPPC semantics.
270 If your platform does not support CPPC in firmware,
271 leave this option disabled.
272
273config ACPI_PROCESSOR
274 tristate "Processor"
275 depends on X86 || IA64 || ARM64
276 select ACPI_PROCESSOR_IDLE
277 select ACPI_CPU_FREQ_PSS if X86 || IA64
278 default y
279 help
280 This driver adds support for the ACPI Processor package. It is required
281 by several flavors of cpufreq performance-state, thermal, throttling and
282 idle drivers.
283
284 To compile this driver as a module, choose M here:
285 the module will be called processor.
286
287config ACPI_IPMI
288 tristate "IPMI"
289 depends on IPMI_HANDLER
290 help
291 This driver enables the ACPI to access the BMC controller. And it
292 uses the IPMI request/response message to communicate with BMC
293 controller, which can be found on on the server.
294
295 To compile this driver as a module, choose M here:
296 the module will be called as acpi_ipmi.
297
298config ACPI_HOTPLUG_CPU
299 bool
300 depends on ACPI_PROCESSOR && HOTPLUG_CPU
301 select ACPI_CONTAINER
302 default y
303
304config ACPI_PROCESSOR_AGGREGATOR
305 tristate "Processor Aggregator"
306 depends on ACPI_PROCESSOR
307 depends on X86
308 help
309 ACPI 4.0 defines processor Aggregator, which enables OS to perform
310 specific processor configuration and control that applies to all
311 processors in the platform. Currently only logical processor idling
312 is defined, which is to reduce power consumption. This driver
313 supports the new device.
314
315config ACPI_THERMAL
316 tristate "Thermal Zone"
317 depends on ACPI_PROCESSOR
318 select THERMAL
319 default y
320 help
321 This driver supports ACPI thermal zones. Most mobile and
322 some desktop systems support ACPI thermal zones. It is HIGHLY
323 recommended that this option be enabled, as your processor(s)
324 may be damaged without it.
325
326 To compile this driver as a module, choose M here:
327 the module will be called thermal.
328
329config ACPI_CUSTOM_DSDT_FILE
330 string "Custom DSDT Table file to include"
331 default ""
332 depends on !STANDALONE
333 help
334 This option supports a custom DSDT by linking it into the kernel.
335 See Documentation/admin-guide/acpi/dsdt-override.rst
336
337 Enter the full path name to the file which includes the AmlCode
338 or dsdt_aml_code declaration.
339
340 If unsure, don't enter a file name.
341
342config ACPI_CUSTOM_DSDT
343 bool
344 default ACPI_CUSTOM_DSDT_FILE != ""
345
346config ARCH_HAS_ACPI_TABLE_UPGRADE
347 def_bool n
348
349config ACPI_TABLE_UPGRADE
350 bool "Allow upgrading ACPI tables via initrd"
351 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
352 default y
353 help
354 This option provides functionality to upgrade arbitrary ACPI tables
355 via initrd. No functional change if no ACPI tables are passed via
356 initrd, therefore it's safe to say Y.
357 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
358
359config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
360 bool "Override ACPI tables from built-in initrd"
361 depends on ACPI_TABLE_UPGRADE
362 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
363 help
364 This option provides functionality to override arbitrary ACPI tables
365 from built-in uncompressed initrd.
366
367 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
368
369config ACPI_DEBUG
370 bool "Debug Statements"
371 help
372 The ACPI subsystem can produce debug output. Saying Y enables this
373 output and increases the kernel size by around 50K.
374
375 Use the acpi.debug_layer and acpi.debug_level kernel command-line
376 parameters documented in Documentation/firmware-guide/acpi/debug.rst and
377 Documentation/admin-guide/kernel-parameters.rst to control the type and
378 amount of debug output.
379
380config ACPI_PCI_SLOT
381 bool "PCI slot detection driver"
382 depends on SYSFS && PCI
383 help
384 This driver creates entries in /sys/bus/pci/slots/ for all PCI
385 slots in the system. This can help correlate PCI bus addresses,
386 i.e., segment/bus/device/function tuples, with physical slots in
387 the system. If you are unsure, say N.
388
389config ACPI_CONTAINER
390 bool "Container and Module Devices"
391 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
392 help
393 This driver supports ACPI Container and Module devices (IDs
394 ACPI0004, PNP0A05, and PNP0A06).
395
396 This helps support hotplug of nodes, CPUs, and memory.
397
398 To compile this driver as a module, choose M here:
399 the module will be called container.
400
401config ACPI_HOTPLUG_MEMORY
402 bool "Memory Hotplug"
403 depends on MEMORY_HOTPLUG
404 help
405 This driver supports ACPI memory hotplug. The driver
406 fields notifications on ACPI memory devices (PNP0C80),
407 which represent memory ranges that may be onlined or
408 offlined during runtime.
409
410 If your hardware and firmware do not support adding or
411 removing memory devices at runtime, you need not enable
412 this driver.
413
414 To compile this driver as a module, choose M here:
415 the module will be called acpi_memhotplug.
416
417config ACPI_HOTPLUG_IOAPIC
418 bool
419 depends on PCI
420 depends on X86_IO_APIC
421 default y
422
423config ACPI_SBS
424 tristate "Smart Battery System"
425 depends on X86
426 select POWER_SUPPLY
427 help
428 This driver supports the Smart Battery System, another
429 type of access to battery information, found on some laptops.
430
431 To compile this driver as a module, choose M here:
432 the modules will be called sbs and sbshc.
433
434config ACPI_HED
435 tristate "Hardware Error Device"
436 help
437 This driver supports the Hardware Error Device (PNP0C33),
438 which is used to report some hardware errors notified via
439 SCI, mainly the corrected errors.
440
441config ACPI_CUSTOM_METHOD
442 tristate "Allow ACPI methods to be inserted/replaced at run time"
443 depends on DEBUG_FS
444 help
445 This debug facility allows ACPI AML methods to be inserted and/or
446 replaced without rebooting the system. For details refer to:
447 Documentation/firmware-guide/acpi/method-customizing.rst.
448
449 NOTE: This option is security sensitive, because it allows arbitrary
450 kernel memory to be written to by root (uid=0) users, allowing them
451 to bypass certain security measures (e.g. if root is not allowed to
452 load additional kernel modules after boot, this feature may be used
453 to override that restriction).
454
455config ACPI_BGRT
456 bool "Boottime Graphics Resource Table support"
457 depends on EFI && (X86 || ARM64)
458 help
459 This driver adds support for exposing the ACPI Boottime Graphics
460 Resource Table, which allows the operating system to obtain
461 data from the firmware boot splash. It will appear under
462 /sys/firmware/acpi/bgrt/ .
463
464config ACPI_REDUCED_HARDWARE_ONLY
465 bool "Hardware-reduced ACPI support only" if EXPERT
466 def_bool n
467 help
468 This config item changes the way the ACPI code is built. When this
469 option is selected, the kernel will use a specialized version of
470 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
471 resulting kernel will be smaller but it will also be restricted to
472 running in ACPI reduced hardware mode ONLY.
473
474 If you are unsure what to do, do not enable this option.
475
476source "drivers/acpi/nfit/Kconfig"
477source "drivers/acpi/numa/Kconfig"
478source "drivers/acpi/apei/Kconfig"
479source "drivers/acpi/dptf/Kconfig"
480
481config ACPI_WATCHDOG
482 bool
483
484config ACPI_EXTLOG
485 tristate "Extended Error Log support"
486 depends on X86_MCE && X86_LOCAL_APIC && EDAC
487 select UEFI_CPER
488 help
489 Certain usages such as Predictive Failure Analysis (PFA) require
490 more information about the error than what can be described in
491 processor machine check banks. Most server processors log
492 additional information about the error in processor uncore
493 registers. Since the addresses and layout of these registers vary
494 widely from one processor to another, system software cannot
495 readily make use of them. To complicate matters further, some of
496 the additional error information cannot be constructed without
497 detailed knowledge about platform topology.
498
499 Enhanced MCA Logging allows firmware to provide additional error
500 information to system software, synchronous with MCE or CMCI. This
501 driver adds support for that functionality with corresponding
502 tracepoint which carries that information to userspace.
503
504config ACPI_ADXL
505 bool
506
507menuconfig PMIC_OPREGION
508 bool "PMIC (Power Management Integrated Circuit) operation region support"
509 help
510 Select this option to enable support for ACPI operation
511 region of the PMIC chip. The operation region can be used
512 to control power rails and sensor reading/writing on the
513 PMIC chip.
514
515if PMIC_OPREGION
516config BYTCRC_PMIC_OPREGION
517 bool "ACPI operation region support for Bay Trail Crystal Cove PMIC"
518 depends on INTEL_SOC_PMIC
519 help
520 This config adds ACPI operation region support for the Bay Trail
521 version of the Crystal Cove PMIC.
522
523config CHTCRC_PMIC_OPREGION
524 bool "ACPI operation region support for Cherry Trail Crystal Cove PMIC"
525 depends on INTEL_SOC_PMIC
526 help
527 This config adds ACPI operation region support for the Cherry Trail
528 version of the Crystal Cove PMIC.
529
530config XPOWER_PMIC_OPREGION
531 bool "ACPI operation region support for XPower AXP288 PMIC"
532 depends on MFD_AXP20X_I2C && IOSF_MBI=y
533 help
534 This config adds ACPI operation region support for XPower AXP288 PMIC.
535
536config BXT_WC_PMIC_OPREGION
537 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
538 depends on INTEL_SOC_PMIC_BXTWC
539 help
540 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
541
542config CHT_WC_PMIC_OPREGION
543 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
544 depends on INTEL_SOC_PMIC_CHTWC
545 help
546 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
547
548config CHT_DC_TI_PMIC_OPREGION
549 bool "ACPI operation region support for Dollar Cove TI PMIC"
550 depends on INTEL_SOC_PMIC_CHTDC_TI
551 help
552 This config adds ACPI operation region support for Dollar Cove TI PMIC.
553
554endif
555
556config ACPI_CONFIGFS
557 tristate "ACPI configfs support"
558 select CONFIGFS_FS
559 help
560 Select this option to enable support for ACPI configuration from
561 userspace. The configurable ACPI groups will be visible under
562 /config/acpi, assuming configfs is mounted under /config.
563
564if ARM64
565source "drivers/acpi/arm64/Kconfig"
566
567config ACPI_PPTT
568 bool
569endif
570
571config TPS68470_PMIC_OPREGION
572 bool "ACPI operation region support for TPS68470 PMIC"
573 depends on MFD_TPS68470
574 help
575 This config adds ACPI operation region support for TI TPS68470 PMIC.
576 TPS68470 device is an advanced power management unit that powers
577 a Compact Camera Module (CCM), generates clocks for image sensors,
578 drives a dual LED for flash and incorporates two LED drivers for
579 general purpose indicators.
580 This driver enables ACPI operation region support control voltage
581 regulators and clocks.
582
583 This option is a bool as it provides an ACPI operation
584 region, which must be available before any of the devices
585 using this, are probed.
586
587endif # ACPI
588
589config X86_PM_TIMER
590 bool "Power Management Timer Support" if EXPERT
591 depends on X86 && (ACPI || JAILHOUSE_GUEST)
592 default y
593 help
594 The Power Management Timer is available on all ACPI-capable,
595 in most cases even if ACPI is unusable or blacklisted.
596
597 This timing source is not affected by power management features
598 like aggressive processor idling, throttling, frequency and/or
599 voltage scaling, unlike the commonly used Time Stamp Counter
600 (TSC) timing source.
601
602 You should nearly always say Y here because many modern
603 systems require this timer.
1# SPDX-License-Identifier: GPL-2.0
2#
3# ACPI Configuration
4#
5
6config ARCH_SUPPORTS_ACPI
7 bool
8
9menuconfig ACPI
10 bool "ACPI (Advanced Configuration and Power Interface) Support"
11 depends on ARCH_SUPPORTS_ACPI
12 select PNP
13 select NLS
14 default y if X86
15 help
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
20 kernel by about 70K.
21
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.
28
29 The project home page for the Linux ACPI subsystem is here:
30 <https://01.org/linux-acpi>
31
32 Linux support for ACPI is based on Intel Corporation's ACPI
33 Component Architecture (ACPI CA). For more information on the
34 ACPI CA, see:
35 <http://acpica.org/>
36
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>
45
46if ACPI
47
48config ACPI_LEGACY_TABLES_LOOKUP
49 bool
50
51config ARCH_MIGHT_HAVE_ACPI_PDC
52 bool
53
54config ACPI_GENERIC_GSI
55 bool
56
57config ACPI_SYSTEM_POWER_STATES_SUPPORT
58 bool
59
60config ACPI_CCA_REQUIRED
61 bool
62
63config ACPI_DEBUGGER
64 bool "AML debugger interface"
65 select ACPI_DEBUG
66 help
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.
71
72if ACPI_DEBUGGER
73
74config ACPI_DEBUGGER_USER
75 tristate "Userspace debugger accessiblity"
76 depends on DEBUG_FS
77 help
78 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
79 to access the debugger functionalities.
80
81endif
82
83config ACPI_SPCR_TABLE
84 bool "ACPI Serial Port Console Redirection Support"
85 default y if X86
86 help
87 Enable support for Serial Port Console Redirection (SPCR) Table.
88 This table provides information about the configuration of the
89 earlycon console.
90
91config ACPI_LPIT
92 bool
93 depends on X86_64
94 default y
95
96config ACPI_SLEEP
97 bool
98 depends on SUSPEND || HIBERNATION
99 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
100 default y
101
102config ACPI_PROCFS_POWER
103 bool "Deprecated power /proc/acpi directories"
104 depends on X86 && PROC_FS
105 help
106 For backwards compatibility, this option allows
107 deprecated power /proc/acpi/ directories to exist, even when
108 they have been replaced by functions in /sys.
109 The deprecated directories (and their replacements) include:
110 /proc/acpi/battery/* (/sys/class/power_supply/*) and
111 /proc/acpi/ac_adapter/* (sys/class/power_supply/*).
112 This option has no effect on /proc/acpi/ directories
113 and functions which do not yet exist in /sys.
114 This option, together with the proc directories, will be
115 deleted in the future.
116
117 Say N to delete power /proc/acpi/ directories that have moved to /sys.
118
119config ACPI_REV_OVERRIDE_POSSIBLE
120 bool "Allow supported ACPI revision to be overridden"
121 depends on X86
122 default y
123 help
124 The platform firmware on some systems expects Linux to return "5" as
125 the supported ACPI revision which makes it expose system configuration
126 information in a special way.
127
128 For example, based on what ACPI exports as the supported revision,
129 Dell XPS 13 (2015) configures its audio device to either work in HDA
130 mode or in I2S mode, where the former is supposed to be used on Linux
131 until the latter is fully supported (in the kernel as well as in user
132 space).
133
134 This option enables a DMI-based quirk for the above Dell machine (so
135 that HDA audio is exposed by the platform firmware to the kernel) and
136 makes it possible to force the kernel to return "5" as the supported
137 ACPI revision via the "acpi_rev_override" command line switch.
138
139config ACPI_EC_DEBUGFS
140 tristate "EC read/write access through /sys/kernel/debug/ec"
141 help
142 Say N to disable Embedded Controller /sys/kernel/debug interface
143
144 Be aware that using this interface can confuse your Embedded
145 Controller in a way that a normal reboot is not enough. You then
146 have to power off your system, and remove the laptop battery for
147 some seconds.
148 An Embedded Controller typically is available on laptops and reads
149 sensor values like battery state and temperature.
150 The kernel accesses the EC through ACPI parsed code provided by BIOS
151 tables. This option allows to access the EC directly without ACPI
152 code being involved.
153 Thus this option is a debug option that helps to write ACPI drivers
154 and can be used to identify ACPI code or EC firmware bugs.
155
156config ACPI_AC
157 tristate "AC Adapter"
158 select POWER_SUPPLY
159 default y
160 help
161 This driver supports the AC Adapter object, which indicates
162 whether a system is on AC or not. If you have a system that can
163 switch between A/C and battery, say Y.
164
165 To compile this driver as a module, choose M here:
166 the module will be called ac.
167
168config ACPI_BATTERY
169 tristate "Battery"
170 select POWER_SUPPLY
171 default y
172 help
173 This driver adds support for battery information through
174 /proc/acpi/battery. If you have a mobile system with a battery,
175 say Y.
176
177 To compile this driver as a module, choose M here:
178 the module will be called battery.
179
180config ACPI_BUTTON
181 tristate "Button"
182 depends on INPUT
183 default y
184 help
185 This driver handles events on the power, sleep, and lid buttons.
186 A daemon reads events from input devices or via netlink and
187 performs user-defined actions such as shutting down the system.
188 This is necessary for software-controlled poweroff.
189
190 To compile this driver as a module, choose M here:
191 the module will be called button.
192
193config ACPI_VIDEO
194 tristate "Video"
195 depends on X86 && BACKLIGHT_CLASS_DEVICE
196 depends on INPUT
197 select THERMAL
198 help
199 This driver implements the ACPI Extensions For Display Adapters
200 for integrated graphics devices on motherboard, as specified in
201 ACPI 2.0 Specification, Appendix B. This supports basic operations
202 such as defining the video POST device, retrieving EDID information,
203 and setting up a video output.
204
205 To compile this driver as a module, choose M here:
206 the module will be called video.
207
208config ACPI_FAN
209 tristate "Fan"
210 depends on THERMAL
211 default y
212 help
213 This driver supports ACPI fan devices, allowing user-mode
214 applications to perform basic fan control (on, off, status).
215
216 To compile this driver as a module, choose M here:
217 the module will be called fan.
218
219config ACPI_TAD
220 tristate "ACPI Time and Alarm (TAD) Device Support"
221 depends on SYSFS && PM_SLEEP
222 help
223 The ACPI Time and Alarm (TAD) device is an alternative to the Real
224 Time Clock (RTC). Its wake timers allow the system to transition from
225 the S3 (or optionally S4/S5) state to S0 state after a time period
226 elapses. In comparison with the RTC Alarm, the TAD provides a larger
227 scale of flexibility in the wake timers. The time capabilities of the
228 TAD maintain the time of day information across platform power
229 transitions, and keep track of time even when the platform is turned
230 off.
231
232config ACPI_DOCK
233 bool "Dock"
234 help
235 This driver supports ACPI-controlled docking stations and removable
236 drive bays such as the IBM Ultrabay and the Dell Module Bay.
237
238config ACPI_CPU_FREQ_PSS
239 bool
240 select THERMAL
241
242config ACPI_PROCESSOR_CSTATE
243 def_bool y
244 depends on IA64 || X86
245
246config ACPI_PROCESSOR_IDLE
247 bool
248 select CPU_IDLE
249
250config ACPI_MCFG
251 bool
252
253config ACPI_CPPC_LIB
254 bool
255 depends on ACPI_PROCESSOR
256 select MAILBOX
257 select PCC
258 help
259 If this option is enabled, this file implements common functionality
260 to parse CPPC tables as described in the ACPI 5.1+ spec. The
261 routines implemented are meant to be used by other
262 drivers to control CPU performance using CPPC semantics.
263 If your platform does not support CPPC in firmware,
264 leave this option disabled.
265
266config ACPI_PROCESSOR
267 tristate "Processor"
268 depends on X86 || IA64 || ARM64
269 select ACPI_PROCESSOR_IDLE
270 select ACPI_CPU_FREQ_PSS if X86 || IA64
271 default y
272 help
273 This driver adds support for the ACPI Processor package. It is required
274 by several flavors of cpufreq performance-state, thermal, throttling and
275 idle drivers.
276
277 To compile this driver as a module, choose M here:
278 the module will be called processor.
279
280config ACPI_IPMI
281 tristate "IPMI"
282 depends on IPMI_HANDLER
283 help
284 This driver enables the ACPI to access the BMC controller. And it
285 uses the IPMI request/response message to communicate with BMC
286 controller, which can be found on on the server.
287
288 To compile this driver as a module, choose M here:
289 the module will be called as acpi_ipmi.
290
291config ACPI_HOTPLUG_CPU
292 bool
293 depends on ACPI_PROCESSOR && HOTPLUG_CPU
294 select ACPI_CONTAINER
295 default y
296
297config ACPI_PROCESSOR_AGGREGATOR
298 tristate "Processor Aggregator"
299 depends on ACPI_PROCESSOR
300 depends on X86
301 help
302 ACPI 4.0 defines processor Aggregator, which enables OS to perform
303 specific processor configuration and control that applies to all
304 processors in the platform. Currently only logical processor idling
305 is defined, which is to reduce power consumption. This driver
306 supports the new device.
307
308config ACPI_THERMAL
309 tristate "Thermal Zone"
310 depends on ACPI_PROCESSOR
311 select THERMAL
312 default y
313 help
314 This driver supports ACPI thermal zones. Most mobile and
315 some desktop systems support ACPI thermal zones. It is HIGHLY
316 recommended that this option be enabled, as your processor(s)
317 may be damaged without it.
318
319 To compile this driver as a module, choose M here:
320 the module will be called thermal.
321
322config ACPI_NUMA
323 bool "NUMA support"
324 depends on NUMA
325 depends on (X86 || IA64 || ARM64)
326 default y if IA64 || ARM64
327
328config ACPI_CUSTOM_DSDT_FILE
329 string "Custom DSDT Table file to include"
330 default ""
331 depends on !STANDALONE
332 help
333 This option supports a custom DSDT by linking it into the kernel.
334 See Documentation/admin-guide/acpi/dsdt-override.rst
335
336 Enter the full path name to the file which includes the AmlCode
337 or dsdt_aml_code declaration.
338
339 If unsure, don't enter a file name.
340
341config ACPI_CUSTOM_DSDT
342 bool
343 default ACPI_CUSTOM_DSDT_FILE != ""
344
345config ARCH_HAS_ACPI_TABLE_UPGRADE
346 def_bool n
347
348config ACPI_TABLE_UPGRADE
349 bool "Allow upgrading ACPI tables via initrd"
350 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
351 default y
352 help
353 This option provides functionality to upgrade arbitrary ACPI tables
354 via initrd. No functional change if no ACPI tables are passed via
355 initrd, therefore it's safe to say Y.
356 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
357
358config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
359 bool "Override ACPI tables from built-in initrd"
360 depends on ACPI_TABLE_UPGRADE
361 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
362 help
363 This option provides functionality to override arbitrary ACPI tables
364 from built-in uncompressed initrd.
365
366 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
367
368config ACPI_DEBUG
369 bool "Debug Statements"
370 help
371 The ACPI subsystem can produce debug output. Saying Y enables this
372 output and increases the kernel size by around 50K.
373
374 Use the acpi.debug_layer and acpi.debug_level kernel command-line
375 parameters documented in Documentation/firmware-guide/acpi/debug.rst and
376 Documentation/admin-guide/kernel-parameters.rst to control the type and
377 amount of debug output.
378
379config ACPI_PCI_SLOT
380 bool "PCI slot detection driver"
381 depends on SYSFS && PCI
382 help
383 This driver creates entries in /sys/bus/pci/slots/ for all PCI
384 slots in the system. This can help correlate PCI bus addresses,
385 i.e., segment/bus/device/function tuples, with physical slots in
386 the system. If you are unsure, say N.
387
388config ACPI_CONTAINER
389 bool "Container and Module Devices"
390 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
391 help
392 This driver supports ACPI Container and Module devices (IDs
393 ACPI0004, PNP0A05, and PNP0A06).
394
395 This helps support hotplug of nodes, CPUs, and memory.
396
397 To compile this driver as a module, choose M here:
398 the module will be called container.
399
400config ACPI_HOTPLUG_MEMORY
401 bool "Memory Hotplug"
402 depends on MEMORY_HOTPLUG
403 help
404 This driver supports ACPI memory hotplug. The driver
405 fields notifications on ACPI memory devices (PNP0C80),
406 which represent memory ranges that may be onlined or
407 offlined during runtime.
408
409 If your hardware and firmware do not support adding or
410 removing memory devices at runtime, you need not enable
411 this driver.
412
413 To compile this driver as a module, choose M here:
414 the module will be called acpi_memhotplug.
415
416config ACPI_HOTPLUG_IOAPIC
417 bool
418 depends on PCI
419 depends on X86_IO_APIC
420 default y
421
422config ACPI_SBS
423 tristate "Smart Battery System"
424 depends on X86
425 select POWER_SUPPLY
426 help
427 This driver supports the Smart Battery System, another
428 type of access to battery information, found on some laptops.
429
430 To compile this driver as a module, choose M here:
431 the modules will be called sbs and sbshc.
432
433config ACPI_HED
434 tristate "Hardware Error Device"
435 help
436 This driver supports the Hardware Error Device (PNP0C33),
437 which is used to report some hardware errors notified via
438 SCI, mainly the corrected errors.
439
440config ACPI_CUSTOM_METHOD
441 tristate "Allow ACPI methods to be inserted/replaced at run time"
442 depends on DEBUG_FS
443 help
444 This debug facility allows ACPI AML methods to be inserted and/or
445 replaced without rebooting the system. For details refer to:
446 Documentation/firmware-guide/acpi/method-customizing.rst.
447
448 NOTE: This option is security sensitive, because it allows arbitrary
449 kernel memory to be written to by root (uid=0) users, allowing them
450 to bypass certain security measures (e.g. if root is not allowed to
451 load additional kernel modules after boot, this feature may be used
452 to override that restriction).
453
454config ACPI_BGRT
455 bool "Boottime Graphics Resource Table support"
456 depends on EFI && (X86 || ARM64)
457 help
458 This driver adds support for exposing the ACPI Boottime Graphics
459 Resource Table, which allows the operating system to obtain
460 data from the firmware boot splash. It will appear under
461 /sys/firmware/acpi/bgrt/ .
462
463config ACPI_REDUCED_HARDWARE_ONLY
464 bool "Hardware-reduced ACPI support only" if EXPERT
465 def_bool n
466 help
467 This config item changes the way the ACPI code is built. When this
468 option is selected, the kernel will use a specialized version of
469 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
470 resulting kernel will be smaller but it will also be restricted to
471 running in ACPI reduced hardware mode ONLY.
472
473 If you are unsure what to do, do not enable this option.
474
475source "drivers/acpi/nfit/Kconfig"
476source "drivers/acpi/hmat/Kconfig"
477
478source "drivers/acpi/apei/Kconfig"
479source "drivers/acpi/dptf/Kconfig"
480
481config ACPI_WATCHDOG
482 bool
483
484config ACPI_EXTLOG
485 tristate "Extended Error Log support"
486 depends on X86_MCE && X86_LOCAL_APIC && EDAC
487 select UEFI_CPER
488 help
489 Certain usages such as Predictive Failure Analysis (PFA) require
490 more information about the error than what can be described in
491 processor machine check banks. Most server processors log
492 additional information about the error in processor uncore
493 registers. Since the addresses and layout of these registers vary
494 widely from one processor to another, system software cannot
495 readily make use of them. To complicate matters further, some of
496 the additional error information cannot be constructed without
497 detailed knowledge about platform topology.
498
499 Enhanced MCA Logging allows firmware to provide additional error
500 information to system software, synchronous with MCE or CMCI. This
501 driver adds support for that functionality with corresponding
502 tracepoint which carries that information to userspace.
503
504config ACPI_ADXL
505 bool
506
507menuconfig PMIC_OPREGION
508 bool "PMIC (Power Management Integrated Circuit) operation region support"
509 help
510 Select this option to enable support for ACPI operation
511 region of the PMIC chip. The operation region can be used
512 to control power rails and sensor reading/writing on the
513 PMIC chip.
514
515if PMIC_OPREGION
516config CRC_PMIC_OPREGION
517 bool "ACPI operation region support for CrystalCove PMIC"
518 depends on INTEL_SOC_PMIC
519 help
520 This config adds ACPI operation region support for CrystalCove PMIC.
521
522config XPOWER_PMIC_OPREGION
523 bool "ACPI operation region support for XPower AXP288 PMIC"
524 depends on MFD_AXP20X_I2C && IOSF_MBI=y
525 help
526 This config adds ACPI operation region support for XPower AXP288 PMIC.
527
528config BXT_WC_PMIC_OPREGION
529 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
530 depends on INTEL_SOC_PMIC_BXTWC
531 help
532 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
533
534config CHT_WC_PMIC_OPREGION
535 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
536 depends on INTEL_SOC_PMIC_CHTWC
537 help
538 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
539
540config CHT_DC_TI_PMIC_OPREGION
541 bool "ACPI operation region support for Dollar Cove TI PMIC"
542 depends on INTEL_SOC_PMIC_CHTDC_TI
543 help
544 This config adds ACPI operation region support for Dollar Cove TI PMIC.
545
546endif
547
548config ACPI_CONFIGFS
549 tristate "ACPI configfs support"
550 select CONFIGFS_FS
551 help
552 Select this option to enable support for ACPI configuration from
553 userspace. The configurable ACPI groups will be visible under
554 /config/acpi, assuming configfs is mounted under /config.
555
556if ARM64
557source "drivers/acpi/arm64/Kconfig"
558
559config ACPI_PPTT
560 bool
561endif
562
563config TPS68470_PMIC_OPREGION
564 bool "ACPI operation region support for TPS68470 PMIC"
565 depends on MFD_TPS68470
566 help
567 This config adds ACPI operation region support for TI TPS68470 PMIC.
568 TPS68470 device is an advanced power management unit that powers
569 a Compact Camera Module (CCM), generates clocks for image sensors,
570 drives a dual LED for flash and incorporates two LED drivers for
571 general purpose indicators.
572 This driver enables ACPI operation region support control voltage
573 regulators and clocks.
574
575 This option is a bool as it provides an ACPI operation
576 region, which must be available before any of the devices
577 using this, are probed.
578
579endif # ACPI
580
581config X86_PM_TIMER
582 bool "Power Management Timer Support" if EXPERT
583 depends on X86 && (ACPI || JAILHOUSE_GUEST)
584 default y
585 help
586 The Power Management Timer is available on all ACPI-capable,
587 in most cases even if ACPI is unusable or blacklisted.
588
589 This timing source is not affected by power management features
590 like aggressive processor idling, throttling, frequency and/or
591 voltage scaling, unlike the commonly used Time Stamp Counter
592 (TSC) timing source.
593
594 You should nearly always say Y here because many modern
595 systems require this timer.