You are required to have gcc, make and kernel-headers installed for building the module.
To detect your kernel version run:
uname -r
It will output something like
6.11.10-2-MANJARO
Then, on Manjaro, run:
sudo pacman -S linux611-headers
Clone the repo into a github directory in your home folder:
mkdir github
cd github
git clone https://github.com/twifty/amd-gpu-i2c.git
cd amd-gpu-i2c
Then run:
make install
The installer will prompt for your sudo password in order to insert the module into the kernel.
For command line interaction with the I2C bus the i2c-dev module is required:
sudo pacman -S i2c-tools
sudo modprobe i2c-dev
List all i2c devices with:
sudo i2cdetect -l
It will output something like
i2c-0 i2c AMDGPU SMU 0 I2C adapter
i2c-1 i2c AMDGPU SMU 1 I2C adapter
i2c-2 i2c AMDGPU DM i2c hw bus 0 I2C adapter
i2c-3 i2c AMDGPU DM i2c hw bus 1 I2C adapter
i2c-4 i2c AMDGPU DM i2c hw bus 2 I2C adapter
i2c-5 i2c AMDGPU DM i2c hw bus 3 I2C adapter
i2c-6 i2c AMDGPU DM aux hw bus 0 I2C adapter
i2c-7 i2c AMDGPU DM aux hw bus 1 I2C adapter
i2c-8 i2c AMDGPU DM aux hw bus 2 I2C adapter
i2c-9 smbus SMBus PIIX4 adapter port 0 at 0b00 SMBus adapter
i2c-10 smbus SMBus PIIX4 adapter port 2 at 0b00 SMBus adapter
i2c-11 smbus SMBus PIIX4 adapter port 1 at 0b20 SMBus adapter
i2c-12 i2c AMD-GPU-I2C hidden bus 0 I2C adapter
Here we can see this module "AMD-GPU-I2C hidden bus" is detected as device number 12. We can now scan that device with:
sudo i2cdetect -y 12
It should output all clients available on that bus:
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: 08 -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- 2a -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --