A kernel module that exposes the Framework Laptop (13, 16)'s battery charge limit and LEDs to userspace.

Install

Packages

On Arch Linux, this module is packaged in the Arch User Repository as framework-laptop-kmod-dkms-git. You can install it for all your locally installed kernels with your favorite AUR helper:

$ yay -S framework-laptop-kmod-dkms-git

Building

By default, this project will try to build a module for your running kernel.

$ make

If you need to target a different kernel, set KDIR:

$ make KDIR=/usr/src/linux-6.5

You can install the module systemwide with make modules_install.

Usage

If the module is installed systemwide, you can load it with modprobe framework_laptop. If you built it manually, you can also use insmod ./framework_laptop.ko.

This module requires cros_ec and cros_ec_lpcs to be loaded and functional.

Note For the Framework Laptop 13 AMD Ryzen 7040 series and the Framework Laptop 16, you will need to apply this patch series to your kernel sources.

Battery Charge Limit

• Exposed via charge_control_end_threshold, available on BAT1
  • /sys/class/power_supply/BAT1/charge_control_end_threshold

LEDs

• /sys/class/leds/framework_laptop::kbd_backlight

Fan Control

This driver supports up to 4 fans, and creates a HWMON interface with the name framework_laptop.

• fan[1-4]_input - Read fan speed in RPM (read-only)
• fan[1-4]_target - Set target fan speed in RPM
  • read-write on the first fan, write-only on the others
• fan[1-4]_fault - Fan removed indicator (read-only)
• fan[1-4]_alarm - Fan stall indicator (read-only)
• pwm[1-4] - Fan speed control in percent 0-100 (write-only)
• pwm[1-4]_enable - Enable automatic fan control (write-only)
  • Currently you can write anything to enable, but I recommend writing 2 in case the driver is updated to support disabling automatic fan control.
  • Writing to the other interfaces will disable automatic fan control.
• pwm[1-4]_min - returns 0 (read-only)
• pwm[1-4]_max - returns 100 (read-only)