First commit: Publish project as open source.

2026-09-24 02:32:08 +00:00 · 2026-07-28 12:52:19 +02:00
commit cc51c61859
27 changed files with 2995 additions and 0 deletions
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 # These are supported funding model platforms
 ko_fi: keyitdev
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 name: build
 on:
  push:
    tags:
      - 'v*'
 jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        cc: [gcc, clang]
    steps:
      - uses: actions/checkout@v4
      - name: Build
        run: make CC=${{ matrix.cc }} CFLAGS="-O2 -Wall -Wextra -Werror -std=c11"
      - name: Smoke test
        run: ./asus-fan-control-ec help
      - name: Staged install
        run: make install DESTDIR=/tmp/pkg PREFIX=/usr && find /tmp/pkg -type f
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 build/
 asus-fan-control-ec
 *.o
 *.d
@@ -0,0 +1,138 @@
 ## How it works
 Some information stated in this document may be incorrect, this document is the result of my reverse engineering.
 ### Control channel
 Fan control is **not** a memory region you can poke. It is a command protocol on a private pair of I/O ports, independent of the ACPI EC (`0x62`/`0x66`) and of the OEM host interface (`0x6C`/`0x68`).
 | port | role |
 |---|---|
 | `0x25C` | data |
 | `0x25D` | command and status |
 Status bits on `0x25D`: `0x01` OBF (a byte is waiting to be read), `0x02` IBF (input buffer busy, do not write).
 A transaction is: drain any stale output, wait for IBF to clear, write the preamble `0xFF` to the command port, write the command, then write each payload byte to the data port, waiting for IBF between bytes. For a read, wait for OBF and take the result from the data port.
 Two commands matter:
 | command | payload | meaning |
 |---|---|---|
 | `0xBB` | `50` | table version, one byte returned |
 | `0xDD` | `<selector> <register> <value>` | register table access |
 In the selector byte, **bit 7 selects the direction**: `0x02` reads from table 2, `0x82` writes to it.
 So reading register `0x30` is `DD 02 30 00`, and writing 140 to register `0x35` is `DD 82 35 8C`.
 ### Registers
 All in table 2, all reached with command `0xDD`.
 | reg | name | access | range | notes |
 |---|---|---|---|---|
 | `0x30` | fan count | R | `2` | constant; used as a liveness check before any write |
 | `0x31` | fan control mode | R/W | `0` / `1` | `0` = EC's own curve, `1` = manual. **Global** |
 | `0x32` | fan select | W | `0`–`1` | chooses which fan `0x33`/`0x34`/`0x35` refer to |
 | `0x33` | tachometer, low byte | R | | |
 | `0x34` | tachometer, high byte | R | | `rpm = (0x34 << 8) \| 0x33` |
 | `0x35` | PWM duty | R/W | `0`–`255` | per fan |
 Two properties are easy to get wrong:
 **`0x31` is global.** It is one bit for the whole controller, not one per fan. Clearing it while fan 1 is selected releases fan 0 as well. Consequently `--fan` does not confine the effect of a write.
 **Entering manual mode freezes both fans** wherever the EC's curve last put them. `set X --fan 0` therefore means "freeze both fans, and give fan 0 the value X" - the fan you did not name stops responding to temperature and sits at whatever duty it happened to have.
 **While `0x31` is `0`, register `0x35` belongs to the controller.** It writes its own computed duty there and overwrites anything the host puts in. Reading it in that state is useful telemetry: it shows what the EC's curve is currently doing.
 ### Setting a fan
 ```
 DD 82 32 <index>       select the fan
 DD 82 31 01            manual mode
 DD 82 32 <index>       re-assert the selection
 DD 82 35 <duty>        duty 0-255
 ```
 Order matters. A duty written while `0x31` is still `0` gets overwritten by the EC's curve before manual mode engages - the vendor software writes in the opposite order and has this bug.
 The selector is written twice on purpose. Coming out of automatic mode, a duty write has been observed landing on the wrong fan, as if the mode write had cleared the selection. Re-asserting it costs one transaction and removes the failure.
 Releasing is the mode register alone, and nothing else:
 ```
 DD 82 31 00            leave the duty untouched
 ```
 ### Reading fan speed
 Two independent paths:
 - **Registers** `0x34` and `0x33` over the ports, three transactions per fan.
 - **The aperture**, a read-only mirror of the controller's RAM in host physical memory. Fan speeds sit at `0xFEDD8B7C` and `0xFEDD8B7E` as big-endian 16-bit values, ready to use.
 The aperture is the better source for telemetry: two bytes at roughly 1.2 µs each, no transaction, no contention with writes. `fan-info` reads both and compares them - that comparison is the validation test.
 ### Temperature
 Temperature is **never written and never read over the control ports.** It comes entirely from the aperture, one byte per sensor:
 | field | address | meaning | confidence |
 |---|---|---|---|
 | `CTMP` | `0xFEDD8358` | CPU temperature, whole °C | confirmed |
 | `CLOT` | `0xFEDD8301` | second sensor, whole °C | name only |
 `CTMP` is confirmed by the machine's own ACPI tables. The thermal zone's `_TMP` method reads that exact byte and converts it with `TTMP = CTMP * 10 + 2732`, which is degrees Celsius turned into tenths of a kelvin. That pins down the location, the unit and the fact that the rest of the system trusts the same number.
 `CLOT` is declared in the ACPI field but never read by anything, so its meaning rests on the field name alone. Treat it as unverified.
 Practical notes:
 - **One unsigned byte.** Whole degrees, no fractions, no negatives. Do not expect it to agree with `k10temp` to the decimal - that driver reads the CPU's own registers over a completely different path.
 - **The refresh rate belongs to the EC.** Reading a hundred times a second gets you nothing that reading once a second does not.
 - **The controller does not measure the CPU.** It receives that number from the SoC and stores it. You are reading the EC's picture of the world.
 You cannot set a temperature. What the curve does is map a temperature to a percent, convert that to a duty with `duty = round(percent * 255 / 100)`, and write the duty. `--sensor` chooses which of the two readings drives the mapping: `cpu`, `board`, or `max` (the default, and the safer choice with two sensors on one curve).
 ---
 ## The vendor path on Windows
 Recorded for comparison, and as the origin of the findings above.
 ```
 HealthyTable_SetFanPwmDuty(duty)              AsusWinIO64.dll, RVA 0x28AE0
  └─ RwEcCmd(len, cmd, buf, dir, &status)     RVA 0x200D0
       └─ DeviceIoControl(\\.\AsusSAIO,
                          0x80102070,
                          req, 16, req, 16)
            └─ IOCTL dispatch                 AsusSAIO.sys, RVA 0x12A0
                 └─ handler                   RVA 0x1AA0
                      └─ transaction core     RVA 0x1828
                           └─ port write      RVA 0x1D70
                                └─ out dx, al RVA 0x1DCB
 ```
 The 16-byte request structure, same buffer in and out:
 | offset | type | field |
 |---|---|---|
 | `0x00` | u8 | command code, `0xBB` or `0xDD` |
 | `0x01` | u8 | payload length, 1–8 |
 | `0x02` | u8[8] | payload |
 | `0x0A` | u8 | direction: 1 expects a returned byte, 0 is a write |
 | `0x0B` | u8 | byte returned by the EC |
 | `0x0C` | u32 | status, `0` = OK, `0x102` = timeout |
 The library needs **SYSTEM**, not merely administrator, and the ASUS System Analysis service has to be running.
 - **`0x12A0`** is the IOCTL dispatcher. It compares the control code against a list; `cmp eax, 0x80102070` sits at `0x1367` and branches to `0x13F7`.
 - **`0x13F7`** rejects the request unless both buffers are at least `0x10` bytes, copies 16 bytes in, calls `0x1AA0`, copies 16 bytes back and sets `Information = 0x10`. This is where the *16 bytes, same buffer both ways* claim comes from.
 - **`0x1AA0`** unpacks the structure exactly as tabulated: command from `[buf]`, length from `[buf+1]`, payload pointer `buf+2`, direction from `[buf+0xA]`, status pointer `buf+0xC`; after calling `0x1828` it stores the returned byte at `[buf+0xB]`. The call is bracketed by `KeWaitForSingleObject` and `KeReleaseMutex` - the serialising mutex is real, and any independent implementation needs its own.
 - **`0x1828`** is the transaction core and carries the port numbers as literals: `mov edx, 0x25c`, and `mov edx, 0x25d` paired with `mov cl, 0xff` - the preamble byte written to the command port.
 - **`0x1734`** is the status-bit wait. It polls at most `0x3E8` = **1000** times and returns `0x102` on expiry. Each iteration calls a helper at `0x1000` that wraps `KeDelayExecutionThread` with a relative interval of `arg × -10` in 100 ns units; the caller passes `0x64` = 100, so **100 µs per poll**. The `POLL_LIMIT` and `POLL_DELAY` constants in this program are the same numbers, arrived at independently.
 - **`0x1D70`** is a generic port write that switches on a width byte: 1 → `out dx, al` at `0x1DCB`, 2 → `out dx, ax`, 4 → `out dx, eax`.
 Two imports are worth noting. `MmMapIoSpace` / `MmUnmapIoSpace` are the driver's own route to the telemetry aperture - the same physical page this program maps through `/dev/mem`. `IoGetCurrentProcess`, `ZwOpenProcessTokenEx`, `ZwQueryInformationToken` and `RtlEqualSid` are the caller check that makes administrator insufficient: the driver compares the calling token's SID rather than checking for elevation.
@@ -0,0 +1,674 @@
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@@ -0,0 +1,53 @@
 CC      ?= cc
 CFLAGS  ?= -O2 -Wall -Wextra -std=c11
 LDFLAGS ?=
 PREFIX  ?= /usr/local
 BINDIR  ?= $(PREFIX)/bin
 DATADIR ?= $(PREFIX)/share
 SYSCONFDIR ?= /etc
 BASHCOMPDIR ?= $(DATADIR)/bash-completion/completions
 ZSHCOMPDIR  ?= $(DATADIR)/zsh/site-functions
 BIN     := asus-fan-control-ec
 SRCDIR  := src
 OBJDIR  := build
 SRC     := $(wildcard $(SRCDIR)/*.c)
 OBJ     := $(patsubst $(SRCDIR)/%.c,$(OBJDIR)/%.o,$(SRC))
 DEP     := $(OBJ:.o=.d)
 .PHONY: all clean install uninstall
 all: $(BIN)
 $(BIN): $(OBJ)
 	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 $(OBJDIR)/%.o: $(SRCDIR)/%.c | $(OBJDIR)
 	$(CC) $(CFLAGS) -MMD -MP -c -o $@ $<
 $(OBJDIR):
 	mkdir -p $(OBJDIR)
 clean:
 	rm -rf $(OBJDIR) $(BIN)
 install: $(BIN)
 	install -Dm755 $(BIN) $(DESTDIR)$(BINDIR)/$(BIN)
 	[ -f $(DESTDIR)$(SYSCONFDIR)/asus-fan-curve.conf ] || \
 		install -Dm644 asus-fan-curve.conf \
 			$(DESTDIR)$(SYSCONFDIR)/asus-fan-curve.conf
 	install -Dm644 asus-fan-control-ec.service \
 		$(DESTDIR)$(PREFIX)/lib/systemd/system/asus-fan-control-ec.service
 	install -Dm644 completions/asus-fan-control-ec.bash \
 		$(DESTDIR)$(BASHCOMPDIR)/$(BIN)
 	install -Dm644 completions/_asus-fan-control-ec \
 		$(DESTDIR)$(ZSHCOMPDIR)/_$(BIN)
 uninstall:
 	rm -f $(DESTDIR)$(BINDIR)/$(BIN)
 	rm -f $(DESTDIR)$(PREFIX)/lib/systemd/system/asus-fan-control-ec.service
 	rm -f $(DESTDIR)$(BASHCOMPDIR)/$(BIN)
 	rm -f $(DESTDIR)$(ZSHCOMPDIR)/_$(BIN)
 -include $(DEP)
@@ -0,0 +1,356 @@
 # asus-fan-control-ec
 asus-fan-control-ec provides fan-control support for ASUS devices, mainly those with AMD processors and systems affected by the `ACPI Error: AE_NOT_FOUND` issue, where the standard ACPI-based interface is unavailable. 
 [![Build](https://github.com/Keyitdev/asus-fan-control-ec/actions/workflows/build.yml/badge.svg)](https://github.com/Keyitdev/asus-fan-control-ec/actions/workflows/build.yml)
 [![Ko-fi](https://img.shields.io/badge/support_me_on_ko--fi-F16061?logo=kofi&logoColor=f5f5f5)](https://ko-fi.com/keyitdev)
 **[Quick start](#quick-start) · [Build](#build) · [Usage](#usage) · [Tested devices](#tested-devices) · [How it works](HOW-IT-WORKS.md) · [Support](#support)**
 ---
 ## Why this exists
 On some ASUS laptops, the fans cannot be set the standard way. There is no hwmon interface for them, no `EmbeddedControl` region for the kernel's EC driver to attach to, and no ACPI method that reaches the fan registers at all.
 Existing tools such as [asus-fan-control](https://github.com/dominiksalvet/asus-fan-control) work around this as ACPI clients: through the `acpi_call` module they invoke a firmware method the vendor already provides, which rewrites the temperature thresholds of the controller's built-in curve. That depends on an ACPI EC object that these laptops do not expose, and even where it works it only shifts when the controller changes gear - it cannot set a duty.
 This project takes the other route and implements the protocol itself, talking to the **embedded controller directly**. It drives a private pair of I/O ports - 0x25C for data and 0x25D for command and status, independent of the ACPI EC at 0x62/0x66 - carrying the controller's own register-table command, and it reads temperatures and tachometers out of a read-only window onto the controller's RAM mapped through /dev/mem. No kernel module, no firmware method, nothing between the program and the hardware.
 ## Quick start
 Build first, then check whether your machine is compatible - **before writing anything to it**.
 ```sh
 make
 sudo ./asus-fan-control-ec fan-info
 ```
 > [!IMPORTANT]
 > `fan-info` is the compatibility check, and it is the only command which is almost safe to run blind:
 it writes no duty and no control mode, so it cannot change how the machine is cooled.
 What it does is read each fan's speed twice over two independent paths - once through
 the I/O ports, once out of the telemetry aperture - and compare them. Agreement proves
 the ports, the command encoding and the register numbers are all correct on your device.
 Look at the last line. If it reads
 ```
 Result: VALIDATED against the MMIO aperture.
 ```
 you are compatible and can carry on. Anything else - a `MISMATCH` verdict, an error,
 a non-zero exit status - means the program is not talking to your embedded controller
 correctly. **Stop there. Do not run `set` or `setp`**. Let me know - open issue.
 Only once validated:
 ```sh
 sudo ./asus-fan-control-ec setp 90
 sudo ./asus-fan-control-ec setp -1
 ```
 `setp 90` pins both fans at 90%. `setp -1` hands the fans back to the embedded
 controller, and is the only correct way to undo the previous line.
 ## Requirements
 Root. The program needs `ioperm` (or `/dev/port`) for the control channel and `/dev/mem` for telemetry.
 If your kernel was built with `CONFIG_STRICT_DEVMEM=y` - most distribution kernels are - `/dev/mem` access to the aperture may be refused. Boot with `iomem=relaxed` if telemetry fails while the ports still work.
 ## Build
 No dependencies beyond libc and a C11 compiler.
 ```sh
 make
 ```
 Produces `./asus-fan-control-ec`. Object files land in `build/`.
 ```sh
 make clean          # remove build/ and the binary
 sudo make install   # installs globally - see below
 sudo make uninstall # removes everything install put on the system
 ```
 **`make install` installs globally.** It copies files out of the source tree and
 into system directories: the binary onto your `PATH`, plus the example config,
 the systemd unit and the bash and zsh completion scripts. That is why it needs
 root. If you only want to try the program out, do not run it - build and use
 `./asus-fan-control-ec` in place. `sudo make uninstall` reverses the install.
 An existing `/etc/asus-fan-curve.conf` is never overwritten by `install`.
 ## Usage
 ```
 asus-fan-control-ec [global options] <command> [options]
 ```
 ### Setting fan speed
 #### `set DUTY`
 Sets the PWM duty on every fan, or on one fan with `--fan`.
 ```sh
 sudo asus-fan-control-ec set 140      # duty 0-255
 sudo asus-fan-control-ec set -1       # hand control back to the EC
 ```
 ```
 Fan count: 2, speeds before: 3575/3673 rpm.
 Attempt 1/3, fans 0 1, duty 140.
 fan 0:
  Set:      OK
  PWM duty: 138 (54%) (0x35=138)
 fan 1:
  Set:      OK
  PWM duty: 138 (54%) (0x35=138)
 Fan count: 2, speeds after: 3796/3789 rpm.
 ```
 Reading back `138` after writing `140` is normal (duty quantisation).
 `speeds after` is sampled immediately, so it shows the fans mid-spin-up, not at their final speed.
 | option | meaning |
 |---|---|
 | `--fan N` | act on one fan only (see the warning below) |
 | `--retries N` | write attempts before giving up, default 3 |
 | `--no-verify` | write and exit without reading back |
 | `--order mode-first\|duty-first` | order of the manual-mode and duty writes, default `mode-first` |
 #### `setp PERCENT`
 Same as `set`, in percent. `-1` releases, exactly like `set -1`.
 ```sh
 sudo asus-fan-control-ec setp 55
 ```
 #### `curve`
 Runs a fan curve from a config file until stopped.
 ```sh
 sudo asus-fan-control-ec curve
 sudo asus-fan-control-ec curve --once --dry-run   # show what it would do
 ```
 ```
 Curve loaded from /etc/asus-fan-curve.conf.
  below 77 C -> 0%
  77-86 C -> 15%
  86-89 C -> 20%
  89-92 C -> 40%
  92-95 C -> 60%
  95 C and above -> 80%
 sensor=max interval=3.0s hysteresis=3C panic=96C
 00:21:28 temp=50C target=  0% manual    applied fan0= 2173 fan1= 2186
 00:21:31 temp=50C target=  0% manual    hold    fan0=    0 fan1=    0
 00:21:34 temp=50C target=  0% manual    hold    fan0=    0 fan1=    0
 00:21:37 temp=88C target= 20% manual    applied fan0=  890 fan1=  740
 00:21:41 temp=92C target= 60% manual    applied fan0= 3024 fan1= 2366
 ^CHanded fan control back to the EC.
 ```
 The mode column reflects the **actual** state, derived from the last successful operation, not from what was requested.
 | status | meaning |
 |---|---|
 | `applied` | took on the first try |
 | `retried` | took after one or more retries |
 | `hold` | no change needed |
 | `FAILED` | did not take; the target is not recorded, so the next tick tries again |
 | option | default | meaning |
 |---|---|---|
 | `--config PATH` | `/etc/asus-fan-curve.conf` | curve file |
 | `--interval S` | 3.0 | seconds between ticks |
 | `--hysteresis C` | 3 | degrees of resistance to stepping down |
 | `--panic-temp C` | 96 | force 100% at or above this |
 | `--sensor cpu\|board\|max` | `max` | which temperature drives the curve |
 | `--retries N` | 3 | write attempts per change |
 | `--once` | | one tick, then exit without releasing |
 | `--dry-run` | | print the parsed curve and exit |
 | `--silent` | | suppress the periodic line; retries and failures still print |
 #### Config file format
 One band per line, `percent,temperature`. Blank lines and `#` comments are ignored. Order does not matter; bands are sorted by temperature.
 ```
 # percent,temperature
 -1,0
 20,60
 40,75
 80,90
 ```
 Reads as: below 60 °C let the EC do its thing, from 60 °C hold 20%, from 75 °C hold 40%, from 90 °C hold 80%.
 A percent of **`-1` hands that band back to the embedded controller**, which is useful for staying out of the way while idle and only taking over when things get warm.
 Hysteresis works on band indexes, not on percentages: the curve steps up immediately, and steps down only once `temperature + hysteresis` also falls into the lower band.
 #### Running as a service
 ```sh
 sudo systemctl enable --now asus-fan-control-ec
 ```
 The unit runs `curve --silent`. The daemon handles `SIGTERM`, `SIGINT` and `SIGHUP` and releases the fans back to the EC on exit; `ExecStopPost` repeats the release as a safety net.
 ### Reading measurements
 #### `fan-speed`
 ```
 Fan control: Manual (0x31=1)
 fan 0: 3963 rpm
 fan 1: 4091 rpm
 ```
 #### `fan-info`
 Full state plus a validation of the control channel against the telemetry aperture. **Run this first on a new machine.**
 ```
 Fan count: 2 (0x30=2)
 Fan control: Manual (0x31=1)
 fan0:
  PWM duty:       138 (54%) (0x35=138)
  Fan speed reg:  3949 rpm (0x34/0x33 = 0F 6D)
  Fan speed mmio: 3949 rpm (0xFEDD8B7C)
  Verdict:        MATCH
 fan1:
  PWM duty:       138 (54%) (0x35=138)
  Fan speed reg:  4083 rpm (0x34/0x33 = 0F F3)
  Fan speed mmio: 4083 rpm (0xFEDD8B7E)
  Verdict:        MATCH
 Result: VALIDATED against the MMIO aperture.
 ```
 `MATCH` means the fan speed read over the I/O ports agrees with the same speed read out of mapped memory, within 64 rpm. Two independent paths reaching the same number proves the handshake, the command encoding, the register identification and the fan selector are all correct. Exit status is 0 only when everything matches.
 The only register this command writes is the fan selector `0x32`, which it has to write in order to read anything per fan. **It never touches the duty `0x35` or the control mode `0x31`**, so it cannot change how the machine is cooled. On an untested model that distinction matters: if `0x32` turns out to mean something else there, this command has still written to it.
 It does *not* prove the speed itself is accurate. Both paths originate from the same counter inside the controller.
 #### `temps-info`
 ```
 CPU:         44 C (0xFEDD8358 = 2C, ERAM+0x58 CTMP)
 Board:       39 C (0xFEDD8301 = 27, ERAM+0x01 CLOT)
 Max:         44 C (higher of the two)
 ```
 #### `version`
 ```
 Laptop model: ASUSTeK COMPUTER INC. ASUS TUF Gaming A15 FA507NV_FA507NV (DMI)
 Embedded controller version: 3.18 (0xFEDD83E4 = 03 12)
 Healthy table version: 17 (0xBB 50)
 ```
 ### Global options
 `--cmd-port N`, `--data-port N`, `--gap SECONDS`, `--verbose`.
 `--verbose` traces every byte written to the ports. `--gap` is the delay after each write, 20 ms by default; the hardware handshake alone is not enough for the controller to keep up.
 ## Tested devices
 | Name | Model | CPU | Embedded Controller version | Support Status |
 |-|-|-|-|-|
 |ASUS TUF Gaming A15|FA507NV_FA507NV|AMD|3.18|Fully supported|
 |ASUS TUF Gaming A15|FA506IU_FA506IU|AMD|3.19|Fully supported|
 Other models in the family may work, but the ports, addresses and register numbers were confirmed on these machines only.
 If your device is not supported, you may want to check out other amazing projects, such as [asus-fan-control](https://github.com/dominiksalvet/asus-fan-control).
 ## Reporting problems
 **Start with the [Tested devices](#tested-devices) table.** Which half of it you land in
 decides what a useful report looks like.
 ### Your device is in the table
 Then the ports, addresses and register numbers are known to be correct for it, and what
 you are seeing is a bug rather than an unsupported machine. Reproduce it before writing
 the report:
 1. Run `sudo asus-fan-control-ec version` and `sudo asus-fan-control-ec fan-info`.
 2. Re-run the command that misbehaved with `--verbose`, which traces every byte written
   to the ports.
 3. Write down what you expected and what happened instead.
 [Open an issue](../../issues/new) with those three things, plus your distribution and
 the output of `uname -r`. If you changed `--cmd-port`, `--data-port` or `--gap`, say so -
 otherwise the trace is being read against the wrong assumptions.
 ### Your device is not in the table
 Report it anyway, and keep it short. Run `fan-info` first, because its last line answers
 the only question that matters:
 - **`Result: VALIDATED against the MMIO aperture.`** - the protocol works on your model.
  Open an issue with the full output of `version` and `fan-info` and the device can be
  added to the table.
 - **Anything else** - a `MISMATCH` verdict, an error, a non-zero exit status. Stop there,
  do not run `set` or `setp`, and open an issue with the same two outputs and whatever
  error you saw. Two sentences describing the machine are enough.
 Paste output as text rather than a screenshot; register values are the whole point of
 the report and they need to be searchable.
 ## Safety
 Trademarks and ownership. ASUS, ASUSTeK, TUF and TUF Gaming are trademarks of ASUSTeK Computer Inc. They appear here descriptively, to identify the hardware this program was written for, and nothing more. This project is independent: not affiliated with, authorised by, endorsed by, or sponsored by ASUSTeK Computer Inc., and the author claims no rights in the company's trademarks, firmware, drivers or hardware designs. No vendor code is included.
 > [!WARNING]
 > **No warranty.** This program writes to undocumented registers of an embedded controller. Used carelessly it can stop the fans, overheat the machine, or leave the cooling system in a state the firmware does not expect - and the register family it uses reaches further than fans, into battery state and non-volatile manufacturing data. It is distributed with absolutely no warranty. You run it as root on your own hardware, at your own risk; the author accepts no liability for damage to devices, loss of data, voided warranties, or anything else that follows from its use. Read the [Safety](#safety) section before the first write, and run fan-info before trusting any of it on a model that is not in the tested table.
 > [!WARNING]
 > **Duty `0` stops the fans and does not give control back.** The controller accepts zero as a valid setting and holds it indefinitely, regardless of temperature. The only correct way to return control is writing `0x31 = 0` **without touching the duty** - that is what `set -1` does.
 > 
 >  **`--fan` does not limit the damage.** Because `0x31` is global and manual mode freezes both fans, a write aimed at one fan changes the state of both. Run `fan-info` afterwards and check the other fan's duty.
 > 
 > **Always release before exiting.** Any process holding a curve needs signal handling that releases the fans. `curve` does this; if you script `set` yourself, you own that responsibility.
 > [!CAUTION]
 > **Do not guess command codes.** The same `0xDD` command family includes battery state operations and writes to non-volatile memory holding the device's manufacturing data. Experimenting with undocumented registers **risks permanent damage**.
 **Recovering a stuck Embedded controller:**
 1. Remove all external devices.
 2. Turn off the device.
 3. Connect the power adapter.
 4. Press and hold the power button for 40 seconds.
 5. More info: [here](https://www.asus.com/support/faq/1050239/)
 ## Support
 Everything this program does had to be worked out by hand: the port pair, the handshake,
 the command encoding and every register number were found by probing an undocumented
 controller and checking each guess against a second, independent read path. That is slow
 work. If the project saved you from a laptop that runs its fans however it likes, a contribution is welcome
 and keeps the work going.
 [![Ko-fi](https://img.shields.io/badge/support_me_on_ko--fi-F16061?style=for-the-badge&logo=kofi&logoColor=f5f5f5)](https://ko-fi.com/keyitdev)
 [https://ko-fi.com/keyitdev](https://ko-fi.com/keyitdev)
 ## How it works
 If you want to read more: 
 [How it works](HOW-IT-WORKS.md)
 ## License
 Distributed under the **[GPLv3+](https://www.gnu.org/licenses/gpl-3.0.html) License**.    
 Copyright (C) 2026 Keyitdev.
@@ -0,0 +1,13 @@
 [Unit]
 Description=asus-fan-control-ec fan curve daemon
 After=multi-user.target
 [Service]
 Type=simple
 ExecStart=/usr/local/bin/asus-fan-control-ec curve --silent
 ExecStopPost=-/usr/local/bin/asus-fan-control-ec set -1
 Restart=on-failure
 RestartSec=5
 [Install]
 WantedBy=multi-user.target
@@ -0,0 +1,5 @@
 # percent,temperature
 # percent -1 hands that band back to the embedded controller
 20,70
 40,80
 80,90
@@ -0,0 +1,61 @@
 #compdef asus-fan-control-ec
 _asus-fan-control-ec() {
    local state
    local -a commands globals
    commands=(
        'set:set PWM duty 0-255, or -1 to hand control back to the EC'
        'setp:set duty in percent, or -1 for the same release'
        'curve:run the fan curve daemon'
        'fan-speed:show control mode and fan speeds'
        'fan-info:full state plus channel validation'
        'temps-info:show both temperatures with their addresses'
        'help:show usage'
        'version:show model, EC version and project info'
    )
    globals=(
        '--cmd-port[command port]:port:'
        '--data-port[data port]:port:'
        '--gap[delay after each write, seconds]:seconds:'
        '--verbose[trace every port write]'
    )
    _arguments -C $globals '1: :->command' '*:: :->args'
    case $state in
        command)
            _describe -t commands 'command' commands
            ;;
        args)
            case $words[1] in
                set|setp)
                    _arguments $globals \
                        '--fan[act on one fan only]:index:(0 1)' \
                        '--retries[write attempts before giving up]:count:' \
                        '--no-verify[write and exit without reading back]' \
                        '--order[order of the mode and duty writes]:order:(mode-first duty-first)'
                    ;;
                curve)
                    _arguments $globals \
                        '--config[curve file]:file:_files' \
                        '--interval[seconds between ticks]:seconds:' \
                        '--hysteresis[degrees of resistance to stepping down]:degrees:' \
                        '--panic-temp[force 100 percent at or above]:degrees:' \
                        '--sensor[which temperature drives the curve]:sensor:(cpu board max)' \
                        '--retries[write attempts per change]:count:' \
                        '--order[order of the mode and duty writes]:order:(mode-first duty-first)' \
                        '--once[one tick, then exit without releasing]' \
                        '--dry-run[print the parsed curve and exit]' \
                        '--silent[suppress the periodic line]'
                    ;;
                *)
                    _arguments $globals
                    ;;
            esac
            ;;
    esac
 }
 _asus-fan-control-ec "$@"
@@ -0,0 +1,64 @@
 _asus_fan_control_ec()
 {
    local cur prev cmd word i skip
    local commands="set setp curve fan-speed fan-info temps-info help version"
    local globals="--cmd-port --data-port --gap --verbose"
    local valued="--cmd-port --data-port --gap --fan --retries --order --config --interval --hysteresis --panic-temp --sensor"
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    case "$prev" in
        --order)
            COMPREPLY=( $(compgen -W "mode-first duty-first" -- "$cur") )
            return ;;
        --sensor)
            COMPREPLY=( $(compgen -W "cpu board max" -- "$cur") )
            return ;;
        --config)
            COMPREPLY=( $(compgen -f -- "$cur") )
            return ;;
        --fan)
            COMPREPLY=( $(compgen -W "0 1" -- "$cur") )
            return ;;
        --cmd-port|--data-port|--gap|--retries|--interval|--hysteresis|--panic-temp)
            return ;;
    esac
    cmd=""
    skip=0
    for (( i=1; i < COMP_CWORD; i++ )); do
        word="${COMP_WORDS[i]}"
        if [ "$skip" = 1 ]; then
            skip=0
            continue
        fi
        case " $valued " in
            *" $word "*)
                skip=1
                continue ;;
        esac
        case " $commands " in
            *" $word "*)
                cmd="$word"
                break ;;
        esac
    done
    if [ -z "$cmd" ]; then
        COMPREPLY=( $(compgen -W "$commands $globals" -- "$cur") )
        return
    fi
    case "$cmd" in
        set|setp)
            COMPREPLY=( $(compgen -W "--fan --retries --no-verify --order $globals" -- "$cur") ) ;;
        curve)
            COMPREPLY=( $(compgen -W "--config --interval --hysteresis --panic-temp --sensor --retries --order --once --dry-run --silent $globals" -- "$cur") ) ;;
        *)
            COMPREPLY=( $(compgen -W "$globals" -- "$cur") ) ;;
    esac
 }
 complete -F _asus_fan_control_ec asus-fan-control-ec
@@ -0,0 +1,396 @@
 #define _GNU_SOURCE
 #include "commands.h"
 #include "common.h"
 #include "ec.h"
 #include "fan.h"
 #include "healthy.h"
 #include "mmio.h"
 #include "util.h"
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 static void print_model(void)
 {
    char vendor[128], product[128];
    if (read_line_file("/sys/class/dmi/id/sys_vendor", vendor, sizeof vendor) &&
        read_line_file("/sys/class/dmi/id/product_name", product, sizeof product))
        printf("Laptop model: %s %s (DMI)\n", vendor, product);
    else if (read_line_file("/sys/class/dmi/id/product_name", product,
                            sizeof product))
        printf("Laptop model: %s (DMI)\n", product);
    else
        printf("Laptop model: unreadable (/sys/class/dmi/id)\n");
 }
 static void print_identity(hy_t *h, mmio_t *m)
 {
    uint8_t version;
    int mj, mn;
    print_model();
    mj = mmio_at(m, ECMJ);
    mn = mmio_at(m, ECMN);
    printf("Embedded controller version: %d.%d (0x%08lX = %02X %02X)\n", mj, mn,
           ECMJ, (unsigned)mj, (unsigned)mn);
    if (hy_version(h, &version))
        printf("Healthy table version: unreadable (0xBB 50)\n");
    else
        printf("Healthy table version: %d (0xBB 50)\n", version);
 }
 static void print_project(void)
 {
    printf("\n");
    printf("%s version: %s\n", APP_NAME, APP_VERSION);
    printf("Source code: %s\n", APP_URL);
    printf("Support the project: %s\n", APP_KOFI);
    printf("License: %s\n", APP_LICENSE);
    printf("%s\n", APP_COPYRIGHT);
 }
 int cmd_version(args_t *a)
 {
    ec_t ec;
    hy_t h;
    mmio_t mm;
    if (geteuid() == 0) {
        ec_open(&ec, a->cmd_port, a->data_port, a->verbose);
        h.ec = &ec;
        h.gap = a->gap;
        mmio_open(&mm, ERM2);
        print_identity(&h, &mm);
        mmio_close(&mm);
        ec_close(&ec);
    } else {
        print_model();
        printf("Embedded controller version: root required\n");
        printf("Healthy table version: root required\n");
    }
    print_project();
    return 0;
 }
 int cmd_fan_info(args_t *a)
 {
    ec_t ec;
    hy_t h;
    mmio_t mm;
    int duty[MAX_FANS], mode[MAX_FANS], rpm[MAX_FANS];
    int hi[MAX_FANS], lo[MAX_FANS], ref[MAX_FANS];
    int count, idx, agree = 0, checked = 0, spinning = 0, rc = 0;
    bool uniform = true;
    ec_open(&ec, a->cmd_port, a->data_port, a->verbose);
    h.ec = &ec;
    h.gap = a->gap;
    mmio_open(&mm, ERM2);
    count = fan_count_or_default(&h);
    if (count < 1 || count > MAX_FANS) {
        printf("Fan count: unreadable (0x30 out of range)\n");
        rc = 1;
        goto out;
    }
    printf("Fan count: %d (0x30=%d)\n", count, count);
    for (idx = 0; idx < count; idx++) {
        uint8_t d = 0, m = 0, rh = 0, rl = 0;
        duty[idx] = -1;
        mode[idx] = -1;
        rpm[idx] = -1;
        ref[idx] = -1;
        hi[idx] = 0;
        lo[idx] = 0;
        if (hy_select(&h, idx))
            continue;
        if (!hy_read(&h, REG_PWM_DUTY, &d))
            duty[idx] = d;
        if (!hy_read(&h, REG_TEST_MODE, &m))
            mode[idx] = m;
        if (!hy_read(&h, REG_RPM_HI, &rh) && !hy_read(&h, REG_RPM_LO, &rl)) {
            hi[idx] = rh;
            lo[idx] = rl;
            rpm[idx] = (rh << 8) | rl;
        }
        if (idx < 2)
            ref[idx] = mmio_be16(&mm, TACH_OFFSET + 2 * (unsigned long)idx);
        if (ref[idx] > 0)
            spinning++;
    }
    for (idx = 1; idx < count; idx++)
        if (mode[idx] != mode[0])
            uniform = false;
    if (!uniform)
        printf("Fan control: differs between fans (see below)\n");
    else if (mode[0] < 0)
        printf("Fan control: unreadable (0x31)\n");
    else
        printf("Fan control: %s (0x31=%d)\n", mode_name(mode[0]), mode[0]);
    for (idx = 0; idx < count; idx++) {
        unsigned long addr = ERM2 + TACH_OFFSET + 2 * (unsigned long)idx;
        int expect = ref[idx];
        printf("\nfan%d:\n", idx);
        if (duty[idx] < 0)
            printf("  PWM duty:       unreadable (0x35)\n");
        else
            printf("  PWM duty:       %d (%d%%) (0x35=%d)\n", duty[idx],
                   duty_to_percent(duty[idx]), duty[idx]);
        if (!uniform)
            printf("  Fan control:    %s (0x31=%d)\n", mode_name(mode[idx]),
                   mode[idx]);
        if (rpm[idx] < 0)
            printf("  Fan speed reg:  unreadable (0x34/0x33)\n");
        else
            printf("  Fan speed reg:  %d rpm (0x34/0x33 = %02X %02X)\n", rpm[idx],
                   (unsigned)hi[idx], (unsigned)lo[idx]);
        if (expect < 0)
            printf("  Fan speed mmio: no aperture slot\n");
        else
            printf("  Fan speed mmio: %d rpm (0x%08lX)\n", expect, addr);
        if (rpm[idx] < 0 || expect < 0) {
            printf("  Verdict:        UNKNOWN\n");
            continue;
        }
        checked++;
        if (abs(rpm[idx] - expect) <= TACH_TOL) {
            agree++;
            printf("  Verdict:        MATCH\n");
        } else {
            printf("  Verdict:        MISMATCH\n");
        }
    }
    printf("\n");
    if (!spinning) {
        printf("Result: both tachometers read zero, spin the fans up and retry.\n");
        rc = 1;
    } else if (checked == count && agree == count) {
        printf("Result: VALIDATED against the MMIO aperture.\n");
        printf("If the program works on your device and it is not listed\nin the tested devices section on github, please open an issue.\n");
    } else {
        printf("Result: NOT VALIDATED, do not write anything.\n");
        rc = 1;
    }
 out:
    mmio_close(&mm);
    ec_close(&ec);
    return rc;
 }
 int cmd_temps_info(args_t *a)
 {
    mmio_t mm;
    int cpu, board;
    (void)a;
    mmio_open(&mm, ERAM);
    cpu = mmio_at(&mm, CTMP);
    board = mmio_at(&mm, CLOT);
    mmio_close(&mm);
    printf("CPU:         %d C (0x%08lX = %02X, ERAM+0x58 CTMP)\n", cpu, CTMP,
           (unsigned)cpu);
    printf("Board:       %d C (0x%08lX = %02X, ERAM+0x01 CLOT)\n", board, CLOT,
           (unsigned)board);
    printf("Max:         %d C (higher of the two)\n", imax(cpu, board));
    return 0;
 }
 int cmd_fan_speed(args_t *a)
 {
    ec_t ec;
    hy_t h;
    uint8_t mode;
    int n, idx;
    ec_open(&ec, a->cmd_port, a->data_port, a->verbose);
    h.ec = &ec;
    h.gap = a->gap;
    n = fan_count_or_default(&h);
    if (n < 1 || n > MAX_FANS)
        n = 2;
    if (hy_read(&h, REG_TEST_MODE, &mode))
        printf("Fan control: unreadable (0x31)\n");
    else
        printf("Fan control: %s (0x31=%d)\n", mode_name(mode), mode);
    for (idx = 0; idx < n; idx++) {
        int rpm;
        if (hy_select(&h, idx) || hy_rpm(&h, &rpm))
            printf("fan %d: speed unreadable\n", idx);
        else
            printf("fan %d: %d rpm\n", idx, rpm);
    }
    ec_close(&ec);
    return 0;
 }
 static int verify(hy_t *h, int duty, const int *pending, int npending,
                  int *failed)
 {
    int i, nfailed = 0;
    for (i = 0; i < npending; i++) {
        int idx = pending[i], rb, md;
        bool ok;
        printf("fan %d:\n", idx);
        if (readback(h, idx, &rb, &md)) {
            printf("  Set:      FAILED, readback error: %s\n", ec_error);
            printf("  PWM duty: unreadable (0x35)\n");
            ok = false;
        } else {
            ok = duty_close(rb, duty);
            if (ok)
                printf("  Set:      OK\n");
            else
                printf("  Set:      FAILED, wanted duty %d\n", duty);
            printf("  PWM duty: %d (%d%%) (0x35=%d)\n", rb, duty_to_percent(rb),
                   rb);
        }
        if (!ok)
            failed[nfailed++] = idx;
    }
    return nfailed;
 }
 static int drive(hy_t *h, int duty, const int *targets, int ntargets,
                 args_t *a, int *left)
 {
    int pending[MAX_FANS], npending = ntargets;
    int failed[MAX_FANS], nfailed;
    int attempt, i;
    char list[64];
    memcpy(pending, targets, sizeof(int) * (size_t)ntargets);
    for (attempt = 1; attempt <= a->retries; attempt++) {
        join_ints(list, sizeof list, pending, npending);
        printf("Attempt %d/%d, fans %s, duty %d.\n", attempt, a->retries, list, duty);
        for (i = 0; i < npending; i++)
            if (apply_duty(h, pending[i], duty, a->order))
                printf("  fan %d FAIL, write failed: %s.\n", pending[i], ec_error);
        if (a->no_verify)
            return 0;
        nfailed = verify(h, duty, pending, npending, failed);
        if (!nfailed)
            return 0;
        memcpy(pending, failed, sizeof(int) * (size_t)nfailed);
        npending = nfailed;
    }
    memcpy(left, pending, sizeof(int) * (size_t)npending);
    return npending;
 }
 static int run_set(args_t *a, int duty)
 {
    ec_t ec;
    hy_t h;
    mmio_t mm;
    int count, targets[MAX_FANS], ntargets, left[MAX_FANS], nleft, fans[2], i;
    char list[64];
    if (duty < 0 || duty > 255)
        die("Duty must be 0..255, or -1 to hand control back to the EC.");
    ec_open(&ec, a->cmd_port, a->data_port, a->verbose);
    h.ec = &ec;
    h.gap = a->gap;
    mmio_open(&mm, ERM2);
    count = fan_count_or_default(&h);
    if (count < 1 || count > MAX_FANS) {
        mmio_close(&mm);
        ec_close(&ec);
        die("Fan count from 0x30 is implausible, refusing to write.");
    }
    mmio_fans(&mm, fans);
    printf("Fan count: %d, speeds before: %d/%d rpm.\n", count, fans[0], fans[1]);
    if (a->index < 0) {
        ntargets = count;
        for (i = 0; i < count; i++)
            targets[i] = i;
    } else {
        ntargets = 1;
        targets[0] = a->index;
    }
    nleft = drive(&h, duty, targets, ntargets, a, left);
    mmio_fans(&mm, fans);
    printf("Fan count: %d, speeds after: %d/%d rpm.\n", count, fans[0], fans[1]);
    mmio_close(&mm);
    ec_close(&ec);
    if (nleft) {
        join_ints(list, sizeof list, left, nleft);
        printf("\n");
        printf("Fans %s did not take the setting after %d attempts.\n", list,
               a->retries);
        return 1;
    }
    return 0;
 }
 static int run_release(args_t *a)
 {
    ec_t ec;
    hy_t h;
    int left[MAX_FANS];
    int n, nleft;
    char list[64];
    ec_open(&ec, a->cmd_port, a->data_port, a->verbose);
    h.ec = &ec;
    h.gap = a->gap;
    n = fan_count_or_default(&h);
    if (n < 1 || n > MAX_FANS)
        n = 2;
    hand_back(&h, n);
    nleft = still_manual(&h, n, left);
    if (nleft) {
        join_ints(list, sizeof list, left, nleft);
        printf("Fans %s still in manual, retrying.\n", list);
        hand_back(&h, n);
        nleft = still_manual(&h, n, left);
    }
    ec_close(&ec);
    if (nleft) {
        join_ints(list, sizeof list, left, nleft);
        printf("Fans %s are still in manual, the EC did not take the release.\n",
               list);
        return 1;
    }
    printf("Handed fan control back to the EC.\n");
    return 0;
 }
 int cmd_set(args_t *a)
 {
    if (a->duty == RELEASE_ARG)
        return run_release(a);
    return run_set(a, a->duty);
 }
 int cmd_setp(args_t *a)
 {
    int duty;
    if (a->percent == RELEASE_ARG)
        return run_release(a);
    if (a->percent < 0 || a->percent > 100)
        die("Percent must be 0..100, or -1 to hand control back to the EC.");
    duty = percent_to_duty(a->percent);
    printf("%d%% maps to duty %d.\n", a->percent, duty);
    return run_set(a, duty);
 }
@@ -0,0 +1,13 @@
 #ifndef AFC_COMMANDS_H
 #define AFC_COMMANDS_H
 #include "common.h"
 int cmd_version(args_t *a);
 int cmd_fan_info(args_t *a);
 int cmd_fan_speed(args_t *a);
 int cmd_temps_info(args_t *a);
 int cmd_set(args_t *a);
 int cmd_setp(args_t *a);
 #endif
@@ -0,0 +1,77 @@
 #ifndef AFC_COMMON_H
 #define AFC_COMMON_H
 #include <stdbool.h>
 #define DATA_PORT       0x25C
 #define CMD_PORT        0x25D
 #define PREAMBLE        0xFF
 #define CMD_VERSION     0xBB
 #define CMD_TABLE       0xDD
 #define TBL_READ        0x02
 #define TBL_WRITE       0x82
 #define REG_FAN_COUNT   0x30
 #define REG_TEST_MODE   0x31
 #define REG_FAN_INDEX   0x32
 #define REG_RPM_LO      0x33
 #define REG_RPM_HI      0x34
 #define REG_PWM_DUTY    0x35
 #define ERM2            0xFEDD8B00UL
 #define ERAM            0xFEDD8300UL
 #define PAGE_MASK       (~0xFFFUL)
 #define CTMP            (ERAM + 0x58)
 #define CLOT            (ERAM + 0x01)
 #define ECMJ            (ERAM + 0xE4)
 #define ECMN            (ERAM + 0xE5)
 #define TACH_OFFSET     0x7C
 #define APP_NAME        "asus-fan-control-ec"
 #define APP_VERSION     "v1.0.0"
 #define APP_URL         "https://github.com/Keyitdev/asus-fan-control-ec"
 #define APP_KOFI        "https://ko-fi.com/keyitdev"
 #define APP_LICENSE     "GPLv3+"
 #define APP_COPYRIGHT   "Copyright (C) 2026 Keyitdev."
 #define DEFAULT_CONFIG  "/etc/asus-fan-curve.conf"
 #define PANIC_TEMP      96
 #define HYSTERESIS      3
 #define INTERVAL        3.0
 #define OBF             0x01
 #define IBF             0x02
 #define POLL_LIMIT      1000
 #define POLL_DELAY      0.0001
 #define RETRIES         2
 #define IO_GAP          0.02
 #define TOL_PCT         5
 #define TOL_MIN         3
 #define READ_RETRIES    3
 #define TACH_TOL        64
 #define RELEASE_ARG     (-1)
 #define CURVE_UNSET     (-2)
 #define MAX_FANS        2
 #define MAX_POINTS      64
 enum { ORDER_MODE_FIRST, ORDER_DUTY_FIRST };
 enum { SENSOR_CPU, SENSOR_BOARD, SENSOR_MAX };
 enum { APPLY_FAILED, APPLY_CLEAN, APPLY_RETRIED };
 typedef struct {
    unsigned cmd_port;
    unsigned data_port;
    double gap;
    bool verbose;
    int index;
    int retries;
    bool no_verify;
    int order;
    int duty;
    int percent;
    const char *config;
    double interval;
    int hysteresis;
    int panic_temp;
    int sensor;
    bool once;
    bool dry_run;
    bool silent;
 } args_t;
 #endif
@@ -0,0 +1,296 @@
 #define _GNU_SOURCE
 #include "curve.h"
 #include "ec.h"
 #include "fan.h"
 #include "healthy.h"
 #include "mmio.h"
 #include "util.h"
 #include <ctype.h>
 #include <errno.h>
 #include <signal.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 static volatile sig_atomic_t stop_flag = 0;
 static int point_cmp(const void *a, const void *b)
 {
    const point_t *p = a, *q = b;
    if (p->temp != q->temp)
        return p->temp < q->temp ? -1 : 1;
    if (p->percent != q->percent)
        return p->percent < q->percent ? -1 : 1;
    return 0;
 }
 static int load_curve(const char *path, point_t *points)
 {
    FILE *f = fopen(path, "r");
    char line[256];
    int n = 0, num = 0, i;
    if (!f)
        die("Config not found: %s.", path);
    while (fgets(line, sizeof line, f)) {
        char *hash, *sep, *end, *rest;
        long percent, temp;
        num++;
        hash = strchr(line, '#');
        if (hash)
            *hash = '\0';
        rest = line;
        while (*rest && isspace((unsigned char)*rest))
            rest++;
        end = rest + strlen(rest);
        while (end > rest && isspace((unsigned char)end[-1]))
            *--end = '\0';
        if (!*rest)
            continue;
        sep = strpbrk(rest, ",;");
        if (!sep || strpbrk(sep + 1, ",;")) {
            fclose(f);
            die("%s:%d: expected 'percent,temp'.", path, num);
        }
        *sep = '\0';
        errno = 0;
        percent = strtol(rest, &end, 10);
        while (end && *end && isspace((unsigned char)*end))
            end++;
        if (errno || end == rest || *end) {
            fclose(f);
            die("%s:%d: not a pair of integers.", path, num);
        }
        rest = sep + 1;
        while (*rest && isspace((unsigned char)*rest))
            rest++;
        errno = 0;
        temp = strtol(rest, &end, 10);
        while (end && *end && isspace((unsigned char)*end))
            end++;
        if (errno || end == rest || *end) {
            fclose(f);
            die("%s:%d not a pair of integers", path, num);
        }
        if ((percent < 0 && percent != RELEASE_ARG) || percent > 100) {
            fclose(f);
            die("%s:%d: percent must be 0..100, or -1 for EC control.", path, num);
        }
        if (temp < 0 || temp > 120) {
            fclose(f);
            die("%s:%d: temperature out of range.", path, num);
        }
        if (n == MAX_POINTS) {
            fclose(f);
            die("%s has too many points.", path);
        }
        points[n].temp = (int)temp;
        points[n].percent = (int)percent;
        n++;
    }
    fclose(f);
    if (!n)
        die("%s has no usable lines.", path);
    qsort(points, (size_t)n, sizeof points[0], point_cmp);
    for (i = 1; i < n; i++)
        if (points[i].temp == points[i - 1].temp)
            die("%s has duplicate temperatures.", path);
    return n;
 }
 static const char *percent_text(char *buf, size_t size, int percent)
 {
    if (percent == RELEASE_ARG)
        snprintf(buf, size, "EC (auto)");
    else
        snprintf(buf, size, "%d%%", percent);
    return buf;
 }
 static void describe_curve(const point_t *points, int n)
 {
    char text[16];
    int i;
    if (points[0].temp > 0)
        printf("  below %d C -> 0%%\n", points[0].temp);
    for (i = 0; i < n; i++) {
        percent_text(text, sizeof text, points[i].percent);
        if (i + 1 < n)
            printf("  %d-%d C -> %s\n", points[i].temp, points[i + 1].temp, text);
        else
            printf("  %d C and above -> %s\n", points[i].temp, text);
    }
 }
 static int curve_band(const point_t *points, int n, int temp, int current,
                      int hysteresis)
 {
    int band = -1, keep = -1, i;
    for (i = 0; i < n; i++) {
        if (temp >= points[i].temp)
            band = i;
        if (temp + hysteresis >= points[i].temp)
            keep = i;
    }
    if (current == CURVE_UNSET || band >= current)
        return band;
    return imax(band, imin(current, keep));
 }
 static int band_percent(const point_t *points, int band)
 {
    return band < 0 ? 0 : points[band].percent;
 }
 static int apply_percent(hy_t *h, int count, int percent, args_t *a)
 {
    int duty = percent_to_duty(percent);
    int marks[MAX_FANS];
    int attempt, r, idx;
    bool retried = false;
    for (attempt = 1; attempt <= a->retries; attempt++) {
        bool all_seen = false, agreed = true;
        for (idx = 0; idx < count; idx++)
            apply_duty(h, idx, duty, a->order);
        for (r = 1; r <= READ_RETRIES; r++) {
            all_seen = true;
            for (idx = 0; idx < count; idx++) {
                int rb, md;
                marks[idx] = readback(h, idx, &rb, &md) ? -1 : rb;
                if (marks[idx] < 0)
                    all_seen = false;
            }
            if (all_seen)
                break;
            retried = true;
            if (r < READ_RETRIES)
                printf("  Readback failed, retrying read %d/%d.\n", r + 1,
                       READ_RETRIES);
        }
        if (all_seen) {
            for (idx = 1; idx < count; idx++)
                if (marks[idx] != marks[0])
                    agreed = false;
            if (agreed && duty_close(marks[0], duty))
                return retried ? APPLY_RETRIED : APPLY_CLEAN;
        }
        if (attempt < a->retries) {
            retried = true;
            printf("  Setting not confirmed, retrying write %d/%d.\n",
                   attempt + 1, a->retries);
        }
    }
    return APPLY_FAILED;
 }
 static void on_stop(int sig)
 {
    (void)sig;
    stop_flag = 1;
 }
 int cmd_curve(args_t *a)
 {
    point_t points[MAX_POINTS];
    ec_t ec;
    hy_t h;
    mmio_t mm;
    int n, count, current = CURVE_UNSET, band = CURVE_UNSET;
    struct sigaction sa;
    n = load_curve(a->config, points);
    printf("Curve loaded from %s.\n", a->config);
    describe_curve(points, n);
    printf("sensor=%s interval=%.1fs hysteresis=%dC panic=%dC\n",
           sensor_name(a->sensor),
           a->interval, a->hysteresis, a->panic_temp);
    if (a->dry_run)
        return 0;
    ec_open(&ec, a->cmd_port, a->data_port, a->verbose);
    h.ec = &ec;
    h.gap = a->gap;
    mmio_open(&mm, ERM2);
    count = fan_count_or_default(&h);
    if (count < 1 || count > MAX_FANS) {
        mmio_close(&mm);
        ec_close(&ec);
        die("Fan count from 0x30 is implausible, refusing to run.");
    }
    memset(&sa, 0, sizeof sa);
    sa.sa_handler = on_stop;
    sigaction(SIGINT, &sa, NULL);
    sigaction(SIGTERM, &sa, NULL);
    sigaction(SIGHUP, &sa, NULL);
    for (;;) {
        int cpu, board, temp, want, next, fans[2], ticks, i;
        bool panic;
        const char *status, *mode;
        char clock[16], target[8];
        time_t now;
        mmio_temps(&mm, &cpu, &board);
        temp = sensor_pick(a->sensor, cpu, board);
        next = curve_band(points, n, temp, band, a->hysteresis);
        want = band_percent(points, next);
        panic = temp >= a->panic_temp;
        if (panic)
            want = 100;
        if (want != current) {
            int applied = want == RELEASE_ARG ? release_to_ec(&h, count)
                                             : apply_percent(&h, count, want, a);
            if (applied != APPLY_FAILED) {
                current = want;
                band = next;
            }
            status = applied == APPLY_FAILED ? "FAILED"
                     : applied == APPLY_RETRIED ? "retried" : "applied";
        } else {
            band = next;
            status = "hold";
        }
        mode = current == RELEASE_ARG ? "EC (auto)"
               : current == CURVE_UNSET ? "unknown" : "manual";
        if (want == RELEASE_ARG)
            snprintf(target, sizeof target, "%4s", "--");
        else
            snprintf(target, sizeof target, "%3d%%", want);
        mmio_fans(&mm, fans);
        now = time(NULL);
        strftime(clock, sizeof clock, "%H:%M:%S", localtime(&now));
        if (!a->silent) {
            printf("%s temp=%dC target=%s %-9s %-7s fan0=%5d fan1=%5d%s\n", clock,
                   temp, target, mode, status, fans[0], fans[1],
                   panic ? "  PANIC" : "");
            fflush(stdout);
        }
        if (a->once || stop_flag)
            break;
        ticks = (int)(a->interval * 10);
        for (i = 0; i < ticks && !stop_flag; i++)
            nsleep(0.1);
        if (stop_flag)
            break;
    }
    if (!a->once) {
        hand_back(&h, count);
        printf("Handed fan control back to the EC.\n");
    }
    mmio_close(&mm);
    ec_close(&ec);
    return 0;
 }
@@ -0,0 +1,13 @@
 #ifndef AFC_CURVE_H
 #define AFC_CURVE_H
 #include "common.h"
 typedef struct {
    int temp;
    int percent;
 } point_t;
 int cmd_curve(args_t *a);
 #endif
@@ -0,0 +1,163 @@
 #define _GNU_SOURCE
 #include "ec.h"
 #include "common.h"
 #include "util.h"
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #if defined(__i386__) || defined(__x86_64__)
 #include <sys/io.h>
 #define HAVE_PORT_IO 1
 #else
 #define HAVE_PORT_IO 0
 #endif
 char ec_error[64] = "";
 int ec_open(ec_t *e, unsigned cmd_port, unsigned data_port, bool verbose)
 {
    e->cmd_port = cmd_port;
    e->data_port = data_port;
    e->verbose = verbose;
    e->fd = -1;
    e->direct = false;
 #if HAVE_PORT_IO
    if (cmd_port < 0x400 && data_port < 0x400 &&
        ioperm(cmd_port, 1, 1) == 0 && ioperm(data_port, 1, 1) == 0) {
        e->direct = true;
        return 0;
    }
 #endif
    e->fd = open("/dev/port", O_RDWR);
    if (e->fd < 0)
        die("Cannot open /dev/port: %s.", strerror(errno));
    return 0;
 }
 void ec_close(ec_t *e)
 {
    if (e->fd >= 0)
        close(e->fd);
    e->fd = -1;
 }
 static uint8_t ec_in8(ec_t *e, unsigned port)
 {
    uint8_t v;
 #if HAVE_PORT_IO
    if (e->direct)
        return inb((unsigned short)port);
 #endif
    if (pread(e->fd, &v, 1, (off_t)port) != 1)
        die("Cannot read port 0x%03X: %s.", port, strerror(errno));
    return v;
 }
 static void ec_out8(ec_t *e, unsigned port, uint8_t val)
 {
    if (e->verbose)
        printf("      out 0x%03X <- %02X\n", port, (unsigned)val);
 #if HAVE_PORT_IO
    if (e->direct) {
        outb(val, (unsigned short)port);
        return;
    }
 #endif
    if (pwrite(e->fd, &val, 1, (off_t)port) != 1)
        die("Cannot write port 0x%03X: %s.", port, strerror(errno));
 }
 static uint8_t ec_status(ec_t *e)
 {
    return ec_in8(e, e->cmd_port);
 }
 static int ec_timeout(const char *what)
 {
    snprintf(ec_error, sizeof ec_error, "%s", what);
    return -1;
 }
 static int ec_drain(ec_t *e)
 {
    int i;
    for (i = 0; i < POLL_LIMIT; i++) {
        if (!(ec_status(e) & OBF))
            return 0;
        ec_in8(e, e->data_port);
        nsleep(POLL_DELAY);
    }
    return ec_timeout("obf never cleared");
 }
 static int ec_wait_ibf(ec_t *e)
 {
    int i;
    for (i = 0; i < POLL_LIMIT; i++) {
        if (!(ec_status(e) & IBF))
            return 0;
        nsleep(POLL_DELAY);
    }
    return ec_timeout("ibf never cleared");
 }
 static int ec_wait_obf(ec_t *e)
 {
    int i;
    for (i = 0; i < POLL_LIMIT; i++) {
        if (ec_status(e) & OBF)
            return 0;
        nsleep(POLL_DELAY);
    }
    return ec_timeout("obf never set");
 }
 static int ec_once(ec_t *e, uint8_t cmd, const uint8_t *payload, size_t n,
                   bool want_result, uint8_t *out)
 {
    size_t i;
    if (ec_drain(e) || ec_wait_ibf(e))
        return -1;
    ec_out8(e, e->cmd_port, PREAMBLE);
    if (ec_wait_ibf(e))
        return -1;
    ec_out8(e, e->cmd_port, cmd);
    for (i = 0; i < n; i++) {
        if (ec_wait_ibf(e))
            return -1;
        ec_out8(e, e->data_port, payload[i]);
    }
    if (ec_wait_ibf(e))
        return -1;
    if (!want_result)
        return 0;
    if (ec_wait_obf(e))
        return -1;
    if (out)
        *out = ec_in8(e, e->data_port);
    return 0;
 }
 int ec_xact(ec_t *e, uint8_t cmd, const uint8_t *payload, size_t n,
                   bool want_result, uint8_t *out)
 {
    int i;
    if (n > 8)
        die("Payload limit is 8 bytes.");
    for (i = 0; i < RETRIES; i++)
        if (ec_once(e, cmd, payload, n, want_result, out) == 0)
            return 0;
    return -1;
 }
@@ -0,0 +1,23 @@
 #ifndef AFC_EC_H
 #define AFC_EC_H
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 typedef struct {
    int fd;
    bool direct;
    unsigned cmd_port;
    unsigned data_port;
    bool verbose;
 } ec_t;
 extern char ec_error[64];
 int ec_open(ec_t *e, unsigned cmd_port, unsigned data_port, bool verbose);
 void ec_close(ec_t *e);
 int ec_xact(ec_t *e, uint8_t cmd, const uint8_t *payload, size_t n,
            bool want_result, uint8_t *out);
 #endif
@@ -0,0 +1,109 @@
 #define _GNU_SOURCE
 #include "fan.h"
 #include "common.h"
 #include "util.h"
 #include <stdlib.h>
 int percent_to_duty(int percent)
 {
    return (int)(percent * 255 / 100.0 + 0.5);
 }
 int duty_to_percent(int duty)
 {
    return (int)(duty * 100 / 255.0 + 0.5);
 }
 bool duty_close(int readback_value, int want)
 {
    int slack = want * TOL_PCT / 100;
    if (slack < TOL_MIN)
        slack = TOL_MIN;
    return abs(readback_value - want) <= slack;
 }
 const char *mode_name(int mode)
 {
    if (mode < 0)
        return "unreadable";
    return mode ? "Manual" : "EC automatic";
 }
 int fan_count_or_default(hy_t *h)
 {
    uint8_t n;
    if (hy_read(h, REG_FAN_COUNT, &n))
        return 0;
    return (n >= 1 && n <= MAX_FANS) ? n : 0;
 }
 int apply_duty(hy_t *h, int index, int duty, int order)
 {
    if (hy_select(h, index))
        return -1;
    if (order == ORDER_MODE_FIRST) {
        if (hy_write(h, REG_TEST_MODE, 1))
            return -1;
        if (hy_select(h, index))
            return -1;
        if (hy_write(h, REG_PWM_DUTY, (uint8_t)duty))
            return -1;
    } else {
        if (hy_write(h, REG_PWM_DUTY, (uint8_t)duty))
            return -1;
        if (hy_write(h, REG_TEST_MODE, 1))
            return -1;
    }
    return 0;
 }
 int readback(hy_t *h, int index, int *duty, int *mode)
 {
    uint8_t d, m;
    if (hy_select(h, index) || hy_read(h, REG_PWM_DUTY, &d) ||
        hy_read(h, REG_TEST_MODE, &m))
        return -1;
    *duty = d;
    *mode = m;
    return 0;
 }
 void hand_back(hy_t *h, int count)
 {
    int idx;
    for (idx = 0; idx < count; idx++) {
        if (hy_select(h, idx))
            continue;
        hy_write(h, REG_TEST_MODE, 0);
    }
 }
 int still_manual(hy_t *h, int count, int *left)
 {
    int idx, nleft = 0;
    for (idx = 0; idx < count; idx++) {
        int rb, md;
        if (readback(h, idx, &rb, &md) == 0 && md)
            left[nleft++] = idx;
    }
    return nleft;
 }
 int release_to_ec(hy_t *h, int count)
 {
    int left[MAX_FANS];
    hand_back(h, count);
    if (!still_manual(h, count, left))
        return APPLY_CLEAN;
    hand_back(h, count);
    return still_manual(h, count, left) ? APPLY_FAILED : APPLY_RETRIED;
 }
@@ -0,0 +1,19 @@
 #ifndef AFC_FAN_H
 #define AFC_FAN_H
 #include "healthy.h"
 #include <stdbool.h>
 int percent_to_duty(int percent);
 int duty_to_percent(int duty);
 bool duty_close(int readback_value, int want);
 const char *mode_name(int mode);
 int fan_count_or_default(hy_t *h);
 int apply_duty(hy_t *h, int index, int duty, int order);
 int readback(hy_t *h, int index, int *duty, int *mode);
 void hand_back(hy_t *h, int count);
 int still_manual(hy_t *h, int count, int *left);
 int release_to_ec(hy_t *h, int count);
 #endif
@@ -0,0 +1,45 @@
 #define _GNU_SOURCE
 #include "healthy.h"
 #include "common.h"
 #include "util.h"
 int hy_version(hy_t *h, uint8_t *out)
 {
    uint8_t payload[1] = { 0x50 };
    return ec_xact(h->ec, CMD_VERSION, payload, 1, true, out);
 }
 int hy_read(hy_t *h, uint8_t reg, uint8_t *out)
 {
    uint8_t payload[3] = { TBL_READ, reg, 0x00 };
    return ec_xact(h->ec, CMD_TABLE, payload, 3, true, out);
 }
 int hy_write(hy_t *h, uint8_t reg, uint8_t value)
 {
    uint8_t payload[3] = { TBL_WRITE, reg, value };
    if (ec_xact(h->ec, CMD_TABLE, payload, 3, false, NULL))
        return -1;
    nsleep(h->gap);
    return 0;
 }
 int hy_select(hy_t *h, int index)
 {
    return hy_write(h, REG_FAN_INDEX, (uint8_t)index);
 }
 int hy_rpm(hy_t *h, int *out)
 {
    uint8_t hi, lo;
    if (hy_read(h, REG_RPM_HI, &hi) || hy_read(h, REG_RPM_LO, &lo))
        return -1;
    *out = (hi << 8) | lo;
    return 0;
 }
@@ -0,0 +1,19 @@
 #ifndef AFC_HEALTHY_H
 #define AFC_HEALTHY_H
 #include "ec.h"
 #include <stdint.h>
 typedef struct {
    ec_t *ec;
    double gap;
 } hy_t;
 int hy_version(hy_t *h, uint8_t *out);
 int hy_read(hy_t *h, uint8_t reg, uint8_t *out);
 int hy_write(hy_t *h, uint8_t reg, uint8_t value);
 int hy_select(hy_t *h, int index);
 int hy_rpm(hy_t *h, int *out);
 #endif
@@ -0,0 +1,247 @@
 #define _GNU_SOURCE
 #include "commands.h"
 #include "common.h"
 #include "curve.h"
 #include "util.h"
 #include <ctype.h>
 #include <errno.h>
 #include <signal.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 static void need_root(void)
 {
    if (geteuid() != 0)
        die("Root privileges required.");
 }
 static const char INT_MSG[] =
    "\nInterrupted. Fans keep the last setting, use 'set -1' to hand control "
    "back to the EC.\n";
 static void on_interrupt(int sig)
 {
    (void)sig;
    if (write(STDOUT_FILENO, INT_MSG, sizeof INT_MSG - 1) < 0) {
    }
    _exit(130);
 }
 static void usage_text(FILE *out)
 {
    fprintf(out,
        "usage: " APP_NAME " [global options] <command> [options]\n"
        "\n"
        "global options:\n"
        "  --cmd-port N   --data-port N   --gap SECONDS   --verbose\n"
        "\n"
        "commands:\n"
        "  set        DUTY [--fan N] [--retries N] [--no-verify]\n"
        "             [--order mode-first|duty-first]\n"
        "             duty 0-255, or -1 to hand control back to the EC\n"
        "             -1 always covers every fan, 0x31 is global\n"
        "  setp       PERCENT [same options as set], or -1 for the same release\n"
        "  curve      [--config PATH] [--interval S] [--hysteresis C]\n"
        "             [--panic-temp C] [--sensor cpu|board|max] [--retries N]\n"
        "             [--order ORDER] [--once] [--dry-run] [--silent]\n"
        "             config lines are 'percent,temp'; percent -1 hands that\n"
        "             band back to the EC\n"
        "  fan-speed\n"
        "  fan-info\n"
        "  temps-info\n"
        "  help\n"
        "  version\n");
 }
 static void usage(void)
 {
    usage_text(stderr);
    exit(2);
 }
 static int cmd_help(void)
 {
    usage_text(stdout);
    return 0;
 }
 static const char *need_value(int argc, char **argv, int *i)
 {
    if (*i + 1 >= argc)
        die("%s requires a value.", argv[*i]);
    return argv[++(*i)];
 }
 static long int_auto(const char *s, const char *what)
 {
    char *end;
    long v;
    errno = 0;
    v = strtol(s, &end, 0);
    if (errno || end == s || *end)
        die("Invalid %s: %s.", what, s);
    return v;
 }
 static double dbl_arg(const char *s, const char *what)
 {
    char *end;
    double v;
    errno = 0;
    v = strtod(s, &end);
    if (errno || end == s || *end)
        die("invalid %s: %s", what, s);
    return v;
 }
 static int pick(const char *value, const char *what, const char *const *names,
                int n)
 {
    int i;
    for (i = 0; i < n; i++)
        if (strcmp(value, names[i]) == 0)
            return i;
    die("Invalid %s: %s.", what, value);
 }
 static bool global_option(args_t *a, int argc, char **argv, int *i)
 {
    const char *arg = argv[*i];
    if (strcmp(arg, "--cmd-port") == 0)
        a->cmd_port = (unsigned)int_auto(need_value(argc, argv, i), "--cmd-port");
    else if (strcmp(arg, "--data-port") == 0)
        a->data_port = (unsigned)int_auto(need_value(argc, argv, i), "--data-port");
    else if (strcmp(arg, "--gap") == 0)
        a->gap = dbl_arg(need_value(argc, argv, i), "--gap");
    else if (strcmp(arg, "--verbose") == 0)
        a->verbose = true;
    else
        return false;
    return true;
 }
 int main(int argc, char **argv)
 {
    static const char *const orders[] = { "mode-first", "duty-first" };
    static const char *const sensors[] = { "cpu", "board", "max" };
    args_t a;
    struct sigaction sa;
    const char *cmd = NULL;
    bool have_duty = false;
    int i;
    for (i = 1; i < argc; i++)
        if (strcmp(argv[i], "help") == 0 || strcmp(argv[i], "--help") == 0 ||
            strcmp(argv[i], "-h") == 0)
            return cmd_help();
    memset(&a, 0, sizeof a);
    a.cmd_port = CMD_PORT;
    a.data_port = DATA_PORT;
    a.gap = IO_GAP;
    a.index = -1;
    a.retries = 3;
    a.order = ORDER_MODE_FIRST;
    a.config = DEFAULT_CONFIG;
    a.interval = INTERVAL;
    a.hysteresis = HYSTERESIS;
    a.panic_temp = PANIC_TEMP;
    a.sensor = SENSOR_MAX;
    i = 1;
    while (i < argc && argv[i][0] == '-' && argv[i][1]) {
        if (!global_option(&a, argc, argv, &i))
            usage();
        i++;
    }
    if (i >= argc)
        usage();
    cmd = argv[i++];
    if (strcmp(cmd, "version") != 0)
        need_root();
    for (; i < argc; i++) {
        const char *arg = argv[i];
        if (global_option(&a, argc, argv, &i))
            continue;
        if (arg[0] != '-' || isdigit((unsigned char)arg[1])) {
            if (strcmp(cmd, "set") == 0 && !have_duty) {
                a.duty = (int)int_auto(arg, "duty");
                have_duty = true;
            } else if (strcmp(cmd, "setp") == 0 && !have_duty) {
                a.percent = (int)int_auto(arg, "percent");
                have_duty = true;
            } else {
                usage();
            }
            continue;
        }
        if (strcmp(arg, "--fan") == 0)
            a.index = (int)int_auto(need_value(argc, argv, &i), "--fan");
        else if (strcmp(arg, "--retries") == 0)
            a.retries = (int)int_auto(need_value(argc, argv, &i), "--retries");
        else if (strcmp(arg, "--no-verify") == 0)
            a.no_verify = true;
        else if (strcmp(arg, "--order") == 0)
            a.order = pick(need_value(argc, argv, &i), "--order", orders, 2);
        else if (strcmp(arg, "--sensor") == 0)
            a.sensor = pick(need_value(argc, argv, &i), "--sensor", sensors, 3);
        else if (strcmp(arg, "--config") == 0)
            a.config = need_value(argc, argv, &i);
        else if (strcmp(arg, "--interval") == 0)
            a.interval = dbl_arg(need_value(argc, argv, &i), "--interval");
        else if (strcmp(arg, "--hysteresis") == 0)
            a.hysteresis = (int)int_auto(need_value(argc, argv, &i), "--hysteresis");
        else if (strcmp(arg, "--panic-temp") == 0)
            a.panic_temp = (int)int_auto(need_value(argc, argv, &i), "--panic-temp");
        else if (strcmp(arg, "--once") == 0)
            a.once = true;
        else if (strcmp(arg, "--dry-run") == 0)
            a.dry_run = true;
        else if (strcmp(arg, "--silent") == 0)
            a.silent = true;
        else {
            usage();
        }
    }
    if (strcmp(cmd, "set") == 0 && !have_duty)
        die("set requires a duty value.");
    if (strcmp(cmd, "setp") == 0 && !have_duty)
        die("setp requires a percent value.");
    if (a.index >= MAX_FANS)
        die("--fan must be 0..%d.", MAX_FANS - 1);
    if (a.retries < 1)
        die("--retries must be at least 1.");
    memset(&sa, 0, sizeof sa);
    sa.sa_handler = on_interrupt;
    sigaction(SIGINT, &sa, NULL);
    if (strcmp(cmd, "version") == 0)
        return cmd_version(&a);
    if (strcmp(cmd, "fan-info") == 0)
        return cmd_fan_info(&a);
    if (strcmp(cmd, "temps-info") == 0)
        return cmd_temps_info(&a);
    if (strcmp(cmd, "fan-speed") == 0)
        return cmd_fan_speed(&a);
    if (strcmp(cmd, "set") == 0)
        return cmd_set(&a);
    if (strcmp(cmd, "setp") == 0)
        return cmd_setp(&a);
    if (strcmp(cmd, "curve") == 0)
        return cmd_curve(&a);
    usage();
    return 2;
 }
@@ -0,0 +1,86 @@
 #define _GNU_SOURCE
 #define _FILE_OFFSET_BITS 64
 #include "mmio.h"
 #include "common.h"
 #include "util.h"
 #include <errno.h>
 #include <fcntl.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>
 void mmio_open(mmio_t *m, unsigned long base)
 {
    void *p;
    m->fd = open("/dev/mem", O_RDONLY | O_SYNC);
    if (m->fd < 0)
        die("Cannot open /dev/mem: %s.", strerror(errno));
    m->page = base & PAGE_MASK;
    m->off = base - m->page;
    p = mmap(NULL, 0x1000, PROT_READ, MAP_SHARED, m->fd, (off_t)m->page);
    if (p == MAP_FAILED)
        die("Cannot map 0x%lX: %s.", m->page, strerror(errno));
    m->map = p;
 }
 void mmio_close(mmio_t *m)
 {
    if (m->map)
        munmap((void *)m->map, 0x1000);
    if (m->fd >= 0)
        close(m->fd);
    m->map = NULL;
    m->fd = -1;
 }
 int mmio_be16(mmio_t *m, unsigned long offset)
 {
    unsigned long i = m->off + offset;
    return (m->map[i] << 8) | m->map[i + 1];
 }
 void mmio_fans(mmio_t *m, int fans[2])
 {
    fans[0] = mmio_be16(m, TACH_OFFSET);
    fans[1] = mmio_be16(m, TACH_OFFSET + 2);
 }
 int mmio_at(mmio_t *m, unsigned long address)
 {
    return m->map[address - m->page];
 }
 void mmio_temps(mmio_t *m, int *cpu, int *board)
 {
    *cpu = mmio_at(m, CTMP);
    *board = mmio_at(m, CLOT);
 }
 const char *sensor_name(int sensor)
 {
    switch (sensor) {
    case SENSOR_CPU:
        return "cpu";
    case SENSOR_BOARD:
        return "board";
    default:
        return "max";
    }
 }
 int sensor_pick(int sensor, int cpu, int board)
 {
    switch (sensor) {
    case SENSOR_CPU:
        return cpu;
    case SENSOR_BOARD:
        return board;
    default:
        return imax(cpu, board);
    }
 }
@@ -0,0 +1,20 @@
 #ifndef AFC_MMIO_H
 #define AFC_MMIO_H
 typedef struct {
    int fd;
    volatile unsigned char *map;
    unsigned long page;
    unsigned long off;
 } mmio_t;
 void mmio_open(mmio_t *m, unsigned long base);
 void mmio_close(mmio_t *m);
 int mmio_be16(mmio_t *m, unsigned long offset);
 int mmio_at(mmio_t *m, unsigned long address);
 void mmio_fans(mmio_t *m, int fans[2]);
 void mmio_temps(mmio_t *m, int *cpu, int *board);
 const char *sensor_name(int sensor);
 int sensor_pick(int sensor, int cpu, int board);
 #endif
@@ -0,0 +1,62 @@
 #define _GNU_SOURCE
 #include "util.h"
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 void die(const char *fmt, ...)
 {
    va_list ap;
    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
    fputc('\n', stderr);
    exit(1);
 }
 void nsleep(double seconds)
 {
    struct timespec ts;
    if (seconds <= 0.0)
        return;
    ts.tv_sec = (time_t)seconds;
    ts.tv_nsec = (long)((seconds - (double)ts.tv_sec) * 1e9);
    if (ts.tv_nsec < 0)
        ts.tv_nsec = 0;
    if (ts.tv_nsec > 999999999L)
        ts.tv_nsec = 999999999L;
    nanosleep(&ts, NULL);
 }
 bool read_line_file(const char *path, char *buf, size_t size)
 {
    FILE *f = fopen(path, "r");
    size_t len;
    if (!f)
        return false;
    if (!fgets(buf, (int)size, f)) {
        fclose(f);
        return false;
    }
    fclose(f);
    len = strlen(buf);
    while (len && (buf[len - 1] == '\n' || buf[len - 1] == '\r'))
        buf[--len] = '\0';
    return len > 0;
 }
 void join_ints(char *buf, size_t size, const int *v, int n)
 {
    int i;
    size_t used = 0;
    buf[0] = '\0';
    for (i = 0; i < n && used + 8 < size; i++)
        used += (size_t)snprintf(buf + used, size - used, "%s%d", i ? " " : "", v[i]);
 }
@@ -0,0 +1,15 @@
 #ifndef AFC_UTIL_H
 #define AFC_UTIL_H
 #include <stdbool.h>
 #include <stddef.h>
 void die(const char *fmt, ...) __attribute__((noreturn, format(printf, 1, 2)));
 void nsleep(double seconds);
 bool read_line_file(const char *path, char *buf, size_t size);
 void join_ints(char *buf, size_t size, const int *v, int n);
 static inline int imin(int a, int b) { return a < b ? a : b; }
 static inline int imax(int a, int b) { return a > b ? a : b; }
 #endif
		`@@ -0,0 +1,3 @@`
							`# These are supported funding model platforms`

							`ko_fi: keyitdev`