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* asmc: add sleep indicator LED control via sysctlAbdelkader Boudih2026-09-062-2/+58
| | | | | | | | | | | Add dev.asmc.0.sil sysctl to control the SIL LED via SMC keys MSLD (duty/brightness) and MSLS (state latch, must be set before re-enabling). MFC After: 1 week Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D58865
* asmc: prefer MMIO backend over PIO when both are presentAbdelkader Boudih2026-08-172-9/+11
| | | | | | | | | | | | | | T2, T1, and some pre-T1 Macs advertise a legacy PIO range in the SMC ACPI _CRS alongside a live MMIO window, but the silicon behind the PIO range is bogus. Try MMIO first, validate via LDKN >= 2, fall back to PIO if that fails or no MMIO resource is present. Drop "(T2)" from the backend message since MMIO isn't T2-exclusive. MFC: 1 week Reviewed by: ngie Differential Revision: https://reviews.freebsd.org/D58839
* asmc: deduplicate sensor converters and cause sysctlsAbdelkader Boudih2026-07-011-108/+45
| | | | | | | | Replace per-type spXX_to_milli() functions with a table-driven asmc_sensor_convert() that looks up the divisor by SMC type string. Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D57854
* asmc: add system state and board identity sysctlsAbdelkader Boudih2026-07-012-0/+306
| | | | | | | | | | | | Add dev.asmc.0.system subtree with read-only sysctls for SMC diagnostic and identity keys: shutdown_cause (MSSD), sleep_cause (MSSP), thermal_status (MSAL), time_of_day (CLKT), power_state (MSPS), board_id (RPlt), and chip_gen (RGEN). Each sysctl is registered only if the key exists on the hardware. Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D57853
* asmc: try PIO before MMIO to avoid false T2 detectionAbdelkader Boudih2026-07-013-26/+33
| | | | | | | | | | | Add hw.asmc.system-state and hw.asmc.board-id read-only sysctls to expose the T2 system state register and Mac board identifier via SMC. Try PIO access before MMIO during probe to prevent false T2 detection on Macs that happen to have something mapped at the T2 BAR address. Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D57844
* asmc: Refactor sensor detection and sysctl registrationAbdelkader Boudih2026-06-251-76/+63
| | | | | | | | Replace repeated per-sensor-type blocks for voltage, current, power, and ambient light sensors with table-driven loops. Reviewed by: ngie, adrian Differential Revision: https://reviews.freebsd.org/D57595
* asmc: fix asmc_key_dump() page fault on T2 MMIO backendAbdelkader Boudih2026-06-141-5/+31
| | | | | | | | | | | | | | asmc_key_dump() used I/O port macros (ASMC_DATAPORT_WRITE/READ, asmc_command()) unconditionally. On T2 Macs, sc_ioport is NULL (MMIO backend is used instead), causing a page fault when ASMC_DEBUG triggers asmc_dumpall() during attach. Add an MMIO guard at the top of asmc_key_dump(): delegate to asmc_key_dump_by_index() + asmc_key_read() for MMIO devices, consistent with the rest of the T2 code paths. Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D56748
* asmc: add MMIO backend for T2 MacsAbdelkader Boudih2026-06-034-24/+609
| | | | | | | | | | | | | | | | | | | | | | | | | | | T2 Macs (2018+) expose the SMC via memory-mapped registers instead of I/O ports. Add asmcmmio.c/asmcmmio.h implementing the MMIO transport: key read/write, getinfo, getbyindex, and a poll-based wait with exponential backoff. The driver probes for MMIO at attach time by checking the LDKN firmware version key; if MMIO is available it is used, otherwise the standard I/O port backend is used. T2 fan speeds use IEEE 754 floats instead of fpe2 fixed-point. Per-fan manual mode uses F%dMd keys instead of the FS! bitmask. Battery charge limit is exposed via dev.asmc.N.battery_charge_limit. Tested on: MacBookPro16,2 (A2251, iBridge2,10) MacBookPro15,4 (A2159, iBridge2,8) MacBookAir8,2 (A1932, iBridge2,5) Mac mini 8,1 (A1993, iBridge2,7) iMac20,2 (A2115, iBridge2,16) iMacPro1,1 (A1862, iBridge1,1) MFC after: 2 weeks Reviewed by: ngie, adrian Differential Revision: https://reviews.freebsd.org/D57086
* Revert "asmc: fix asmc_key_dump() page fault on T2 MMIO backend"Adrian Chadd2026-05-181-31/+5
| | | | | | | This reverts commit 3abc07947c14f5c30e5328d56a2da8dbf8412ebf. I'm not sure how this built locally for me but obviously failed in CI; I'll go figure that out with the submitter and come back.
* asmc: fix asmc_key_dump() page fault on T2 MMIO backendAbdelkader Boudih2026-05-181-5/+31
| | | | | | | | | | | | | | asmc_key_dump() used I/O port macros (ASMC_DATAPORT_WRITE/READ, asmc_command()) unconditionally. On T2 Macs, sc_ioport is NULL (MMIO backend is used instead), causing a page fault when ASMC_DEBUG triggers asmc_dumpall() during attach. Add an MMIO guard at the top of asmc_key_dump(): delegate to asmc_key_dump_by_index() + asmc_key_read() for MMIO devices, consistent with the rest of the T2 code paths. Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D56748
* asmc: rename wol sysctl to auto_poweronAbdelkader Boudih2026-05-042-15/+13
| | | | | | | | | | | Older SMC firmware exposed AUPO as a Wake-on-LAN control. On updated firmware, the key controls automatic power-on when AC power is restored after a power loss; WoL is handled by the GBE controller instead. Rename the sysctl to reflect the current semantics. No compatibility alias is provided as the sysctl has not appeared in any release. Reviewed by: ziaee, adrian Differential Revision: https://reviews.freebsd.org/D56747
* asmc: replace hardcoded model table with universal probingAbdelkader Boudih2026-04-302-1583/+543
| | | | | | | | | | | | | | | | | | | | | Probe SMC keys at attach time to detect hardware capabilities, supporting all Intel Apple machines without per-model entries. Sensors are discovered by scanning sorted SMC key ranges for known prefixes and types. Capabilities such as SMS, fan safe speed, and ambient light are detected by key presence. A global key description table provides human-readable names for well-known temperature sensors. Tested on: - MacBook Pro (Early 2007, Mid 2014, Mid 2015) - MacBook Air (Early 2015, Mid 2017) - iMac (Mid 2011, Late 2013) - Mac mini (Mid 2011) Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D56405
* asmc: add automatic voltage/current/power/ambient sensor detectionAbdelkader Boudih2026-04-172-2/+445
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Apple SMCs contain numerous undocumented voltage, current, power, and ambient light sensors. This change adds automatic detection and registration of these sensors as sysctls. New sysctl trees: dev.asmc.0.voltage.* - Voltage sensors (millivolts) dev.asmc.0.current.* - Current sensors (milliamps) dev.asmc.0.power.* - Power sensors (milliwatts) dev.asmc.0.ambient.* - Ambient light sensors Implementation: - Scans all SMC keys at attach time via asmc_key_dump_by_index() - Identifies sensors by key prefix patterns: - Voltage: VC*, VD*, VG*, VP*, VI* - Current: I{C,D,G,M,N,O,H,P,B,A,L}* - Power: P{C,D,N,S,T,H,F,Z,z}* - Light: ALV*, ALS* - Dynamically creates sysctls for detected sensors - Supports 8 fixed-point SMC data types: - sp78, sp87, sp4b, sp5a, sp69, sp96, sp2d, ui16 - Auto-converts all values to milli-units (mV, mA, mW) On Mac Mini 5,1, detects: - 7 voltage sensors - 18 current sensors - 27 power sensors - 2 ambient light sensors Enables power consumption monitoring, voltage rail debugging, and ambient light detection without hardcoding model-specific sensor lists. Tested on: - Mac Mini 5,1 (2011) running FreeBSD 15.0-RELEASE - 54 sensors auto-detected and exposed via sysctl - All sensor types verified with multimeter readings - Fixed-point conversions validated against known values - Memory management tested (malloc/free on detach) Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D55807
* asmc: correctly label ASMC_KEY_FANMINSPEED as read-writeMarcus Gartner2026-04-161-1/+1
| | | | | Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/2137
* asmc: add support for MacBookPro13,1Marcus Gartner2026-04-162-0/+24
| | | | | | | | | | | | | | | This commit adds support for the MacBookPro13,1 (late 2016, 13-inch). The SMC keys were collected from https://logi.wiki/index.php/SMC_Sensor_Codes. Two temperature keys are omitted because they fail to be read: TI0P (IO Proximity) and Ta0P (Ambient Air). Note that the with this model the `dev.asmc.0.fan.0.minspeed` setting only applies when the fans have been activated by the system. In my testing, the fans did not spin up until CPU temperatures hit about 80C. At lower temperatures, the fans will happily ignore the minimum speed and remain at 0 rpm. Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/2137
* asmc: add raw SMC key read/write interfaceAbdelkader Boudih2026-04-152-47/+259
| | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a debugging interface to read and write arbitrary Apple SMC keys by name through sysctl, enabling hardware exploration and control of undocumented features. The interface provides four sysctls under dev.asmc.0.raw.*: - key - Set the 4-character SMC key name (e.g., "AUPO") - value - Read/write key value as a hex string - len - Auto-detected key value length (can be overridden) - type - Read-only 4-character type string (e.g., "ui8", "flt") Implementation includes a new asmc_key_getinfo() function using SMC command 0x13 to query key metadata. The interface automatically detects key lengths and types, uses hex string encoding for arbitrary binary values, and is safe for concurrent access via CTLFLAG_NEEDGIANT. This interface was essential for discovering that the AUPO key enables Wake-on-LAN from S5 state, and for mapping all 297 SMC keys on Mac Mini 5,1. Reviewed by: ngie, adrian, markj Differential Revision: https://reviews.freebsd.org/D54441
* asmc(4): Add support for backlight(9) interfaceVladimir Kondratyev2026-03-292-0/+68
| | | | MFC after: 1 month
* asmc(4): Add PnP recordVladimir Kondratyev2026-03-291-0/+1
| | | | | | To load asmc(4) automagically on boot with devd(8). MFC after: 1 month
* Add ASMC support for Macbook Pro 8,3tslight2026-03-072-0/+39
| | | | | | Signed-off-by: tslight <tslight@pm.com> Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/1992
* use ASMC_FAN_FUNCS2 to avoid trying to read non-existent keystslight2026-03-071-1/+1
| | | | | | Signed-off-by: tslight <tslight@pm.com> Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/2051
* asmc: output the SMC firmware revision on attachEnji Cooper2026-03-012-2/+12
| | | | | | | | | | | | | | | | The SMC firmware revision can prove helpful when determining why the behavior of a given controller varies from the maintainers' expected behavior. This should be a sysctl (eventually), but for now dumping out the information via `device_printf(..)` suffices, given that only one asmc(4) compatible device can exist in an Apple platform at any given point in time. This will become a sysctl in the future after additional improvements are incorporated from OpenBSD and NetBSD. MFC after: 1 week Obtained from: https://github.com/openbsd/src/ (sys/dev/acpi/asmc.c @ 142d064) Differential Revision: https://reviews.freebsd.org/D55577
* asmc: introduce the concept of generic modelsEnji Cooper2026-02-251-13/+67
| | | | | | | | | | | | | | | | | | | Having to enter in each of the models for Apple hardware, recompiling, etc, is tedious. Provide generic models so end-users can leverage some of the capabilities provided by the driver, i.e., common features like minimal fans and lights (if present on the generic model) support. The generic models are as follows: - Macmini - MacBookAir - MacBookPro - MacPro This sort of follows the pattern established by the `applesmc` driver in Linux. MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D55395
* asmc: add Wake-on-LAN control via sysctlAbdelkader Boudih2026-02-252-0/+50
| | | | | | | | | | | | | | | | | Apple Mac systems support Wake-on-LAN from powered-off state (S5/G2) via the AUPO SMC key. This change adds a convenience sysctl, `dev.asmc.0.wol`. This can be disabled if set to 0 and enabled if set to 1. The AUPO key is volatile and resets to 0x00 on every boot, so WoL must be manually enabled before each shutdown to work from powered-off state. Users need to run: `sysctl dev.asmc.0.wol=1` before shutting down the system. The sysctl is best set to persist in `/etc/sysctl.conf`. MFC after: 1 week Reviewed By: markj, ngie Differential Revision: https://reviews.freebsd.org/D54439
* chore: replace {0, 0} with {DEV,KOBJ}METHOD_ENDEnji Cooper2026-02-251-1/+1
| | | | | | | | | | | | | | Both of the aforementioned macros have been present in FreeBSD for well over a decade: 2009 for `KOBJMETHOD_END`; 2011 for `DEVMETHOD_END`. Adapt all hardcoded references of `{0, 0}` with `DEVMETHOD_END` and `KOBJMETHOD_END` as appropriate. This helps ensure that future adaptations to drivers following patterns documented in driver(9) can be made more easily/without issue. MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D55414
* asmc: resource cleanup simplificationsEnji Cooper2026-02-221-14/+19
| | | | | | | | | | This change makes `asmc_detach(..)` reentrant by setting freed resources to known invalid values when done, and makes `asmc_attach(..)` call `asmc_detach(..)` instead of attempting to the semi-equivalent way of cleaning up the driver resources allocated in `asmc_detach(..)`. MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D55413
* asmc: code style modernization and minor cleanupsEnji Cooper2026-02-211-59/+47
| | | | | | | | | | | | | - Allow `ASMC_DEBUG` to be treated as a variadic macro. - Add ellipses around `sizeof(..)` calls. - Reindent some of the lines to better follow style(9) with line wrapping. A number of other clang-format changes were not taken as they are not compatible with style(9). MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D55394
* chore: asmc: use designated initializers in macrosEnji Cooper2026-02-201-18/+33
| | | | | | | | | | | This code cleanup makes it easier for human readers to understand what each of the fields actually represents, as well as makes it easier to modify what the macros actually do under the covers, without introducing potential human errors. No functional change intended. MFC after: 1 week
* asmc: use symbolic names with the MacPro3,1 modelEnji Cooper2026-02-201-2/+2
| | | | | | | | | | | | Use `ASMC_LIGHT_FUNCS_DISABLED` and `ASMC_SMS_FUNCS_DISABLED` instead of the unrolled versions of the macros. This makes it easier to adjust the underlying macros/fields for `struct asmc_model`. No functional change intended. MFC after: 1 week
* asmc: use `ASMC_FAN_FUNCS2` with the Macmini4,1Enji Cooper2026-02-201-1/+1
| | | | | | | | | | | | | | | | | The Macmini4,1 model does not have "fansafespeed" support. This issue typically manifests with messages like so: ``` asmc0: asmc_key_read for key F0Sf failed 10 times, giving up ``` Swap out `ASMC_FAN_FUNCS` with `ASMC_FAN_FUNCS2` to explicitly drop "fansafespeed" checks in the driver for the model as it doesn't support that hardware feature. MFC after: 1 week Reported by: @probonopd Closes: https://github.com/helloSystem/ISO/issues/357
* asmc: Add MacPro3,1 temperature sensor supportAbdelkader Boudih2026-02-152-0/+78
| | | | | | | Test and verified with Sonicblue7 Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D54952
* asmc: Convert driver to CTLFLAG_MPSAFEAbdelkader Boudih2026-02-131-14/+14
| | | | | | | | | | | | Replace CTLFLAG_NEEDGIANT with CTLFLAG_MPSAFE for all sysctls. The driver already uses spin mutexes (sc->sc_mtx) for hardware access protection and does not require the Giant lock. This improves scalability by allowing concurrent sysctl access without Giant serialization. Reviewed by: ngie, adrian Differential Revision: https://reviews.freebsd.org/D54613
* asmc: unbreak build: add missing curly braceEnji Cooper2026-02-081-1/+1
| | | | Fixes: d76bb14e022 ("chore: asmc: additional style(9) cleanup")
* chore: asmc: additional style(9) cleanupEnji Cooper2026-02-081-49/+56
| | | | | | | | | | | | | | Pick out non-gratuitous style(9) changes suggested by `clang-format` on the driver. This helps eliminate minor stylistic issues with spaces, braces, line lengths, etc, so future functional changes in the driver will be easier to pick out. Many of the other `clang-format` suggested changes were not taken because they were considerably more gratuitous. No functional change intended. MFC after: 1 week
* chore: asmc: minor code cleanupEnji Cooper2026-02-081-35/+37
| | | | | | | | | | | - Use symbolic names in Mac definitions in lieu of the unrolled values they represent. - Delete trailing whitespace. - Fix indentation. No functional change intended. MFC after: 1 week
* asmc: Add support for MacBookPro11,5Abdelkader Boudih2026-01-142-0/+42
| | | | | | | | | | | Add support for the MacBookPro11,5 (Mid 2015, 15-inch with AMD Radeon R9 M370X GPU) to the Apple SMC driver. Debug testing revealed this model lacks several SMC keys present on MacBookPro11,4 (IBLC, ICMC, IC2C), that model-specific sensor definitions. Differential Revision: https://reviews.freebsd.org/D54665 Reviewed by: adrian
* Add ASMC_DEBUG make optionEnji Cooper2026-01-061-9/+11
| | | | | | | | | | | This allows folks to enable debug statements in asmc(4) using kernel configs via the `options ASMC_DEBUG` directive. While here, remove a duplicate `device vt_efifb` directive in `NOTES` as it's already handled in the `GENERIC` config MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D54511
* asmc: add per-fan manual mode control via sysctlAbdelkader Boudih2026-01-051-0/+55
| | | | | | | | | | | | | | | | | | | | | | | | Add per-fan manual mode control via dev.asmc.0.fan.N.manual sysctl. Apple SMCs support manual fan control via the FS! SMC key, a 16-bit bitmask where each bit controls one fan (0=auto, 1=manual). This change adds a new sysctl per fan: dev.asmc.0.fan.N.manual (0=auto, 1=manual) When set to manual mode (1), the fan runs at the speed set via dev.asmc.0.fan.N.targetspeed instead of automatic thermal control. When set to auto mode (0), the SMC controls fan speed automatically. The FS! key was already defined in asmcvar.h but not accessible. This exposes it for debugging, testing, and advanced fan control. Implementation uses read-modify-write to allow independent control of each fan without affecting others. Reviewed by: adrian, markj MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D54437
* asmc: improve asmc_dumpall to read actual SMC key countAbdelkader Boudih2026-01-032-8/+18
| | | | | | | | | | | | | | | | | | | | | | | The asmc_dumpall debug function previously used a hardcoded loop limit of 0x100 (256) keys with a "XXX magic number" comment. This change improves asmc_dumpall to: * Read the actual number of keys from the ASMC_NKEYS SMC key * Print the key count being dumped for better debugging output * Loop only up to the actual key count (e.g., 297 on Mac Mini 5,1) This provides more accurate debug output and removes the magic number. Tested on Mac Mini 5,1 (FreeBSD 16.0-CURRENT): * Rebuild kernel with DEBUG enabled in asmc driver * Boot with new kernel * Verify dmesg shows "asmc_dumpall: dumping 297 keys" (or actual count) * Verify all 297 keys are dumped Differential Revision: https://reviews.freebsd.org/D54436 Reviewed by: markj, adrian
* asmc: Add support for macmini 6,1 and 6,2 (late 2012) modelsHrant Dadivanyan2025-04-252-0/+80
| | | | | | | This adds the ASMC support for the macmini 6,1 and 6,2. PR: kern/268141 Differential Revision: https://reviews.freebsd.org/D49929
* asmc: Add support for MacbookPro11,4Joshua Rogers2024-08-262-0/+40
| | | | | | | Signed-off-by: Joshua Rogers <Joshua@Joshua.Hu> MFC after: 2 weeks Pull Request: https://github.com/freebsd/freebsd-src/pull/1366
* sys: Automated cleanup of cdefs and other formattingWarner Losh2023-11-271-1/+0
| | | | | | | | | | | | | | | | Apply the following automated changes to try to eliminate no-longer-needed sys/cdefs.h includes as well as now-empty blank lines in a row. Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/ Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/ Remove /\n+#if.*\n#endif.*\n+/ Remove /^#if.*\n#endif.*\n/ Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/ Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/ Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/ Sponsored by: Netflix
* sys: Remove $FreeBSD$: one-line .c patternWarner Losh2023-08-161-2/+0
| | | | Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/
* sys: Remove $FreeBSD$: two-line .h patternWarner Losh2023-08-161-2/+0
| | | | Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/
* spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSDWarner Losh2023-05-122-2/+2
| | | | | | | | | The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
* asmc: Add support for 10 byte light sensor payloads; MacBookAir6,1Adrian Chadd2023-02-081-1/+45
| | | | | | | | | | | | | | | | | | The later macbook models use a different packet payload for the light sensors: * There's only one, done in the camera * It's a 4 byte sensor value, not a 2 byte value * It's in a 10 byte payload. So, this adds support for that and flips it on for the MacbookAir6,2. It also adds support for MacBookAir6,1 as that now works fine here. Tested - MacBookAir6,1 and 6,2 Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D38365
* asmc: Add MacbookAir6,2Adrian Chadd2023-01-212-2/+32
| | | | | | | | | | Add in the zones for my MacbookAir6,2, a 2013 Macbook Air. Tested - said Macbook Air 2013. Thermal Zones and keyboard backlight control works fine. Differential Revision: https://reviews.freebsd.org/D38073 Approved by: jrtc27
* asmc: Add support for MacBook5,5Michael Gmelin2023-01-062-7/+38
| | | | | | | | | | | This is a slightly refined version of a patch[0] by FreeBSD Forums user "tmcclean". [0]https://forums.freebsd.org/threads/success-installing-freebsd-13-0-on-macbook-pro-5-5.80458/ Reviewed by: adrian, emaste, imp Differential Revision: https://reviews.freebsd.org/D37900 MFC after: 1 month
* asmc: Add support for MacBookPro6,2ed crowe2022-07-252-1/+49
| | | | | | | | | | Modify asmc_sms_printintr() to be silent when the ambient light sensor interrupt fires on this model, since the messages can otherwise fill up the dmesg. PR: 265005 Reviewed by: markj MFC after: 2 weeks
* asmc: Remove unused devclass argument to DRIVER_MODULE.John Baldwin2022-05-091-3/+1
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* asmc: Update Mac Pro 6 sensor definitionsAdam S2022-05-092-13/+13
| | | | | | | | | - Make descriptions a bit more human-friendly. - Don't attempt to probe fan safe speeds, this model does not provide one. PR: 260781 MFC after: 2 weeks
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