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Linux kernel driver for Avalue product.

• core: it85x8, nct61x6, pca9555 chip implementation.
• library: dio, hwm, lvds, pwm, wdt.. kernel sysfs/ioctl implementation library.
• config: function_control, register_control define for this programme.
• product: avalue product board name routing for config.

# create connection 
nmcli connection up enp1s0 # enp1s0 is network interface device name
 
# 
sudo dnf update
sudo dnf clean all
 
# install dependency packages
sudo dnf group install "Development Tools"

# install gcc, make first
sudo yum -y install git gcc make elfutils-libelf-devel
 
# in package at your installation usb storage find the kernel-devel-`uname -r`.rpm
rpm -ivh kernel-devel-`uname -r`.rpm
 
# centos 7
# open kernel log
sudo vim /etc/rsyslog.conf
# alter line at kernel log
kern.*      /var/log/kernel

sudo apt update
sudo apt -y install gcc make linux-headers-`uname -r`

tar zvxf Avalue_driver.tar.gz
cd Avalue_driver
 
## Parameter
## DRIVER : complier the module you want
## DEBUG=ON : debug mode on, switch pr_debug on/off
## MODULE_NAME : kernel driver module .ko file name
## BOARD_NAME : specify board name if dmi(bios) does not work
 
## Action
## clean : remove complier temp file
## build : complier module
## install : insmod module
## uninstall : rmmod module
## api : complier api
## load_on_boot : auto load kernel module on boot
 
# GPIO
sudo make DRIVER=DIO
 
# PWM
sudo make DRIVER=PWM
 
# WDT
sudo make DRIVER=WDT
 
# HWM
sudo make DRIVER=HWM
 
# LVDS
sudo make DRIVER=LVDS
 
# INFO
sudo make DRIVER=INFO

sudo apt install -y dkms
sudo cp -rf Avalue_driver-${version} /usr/src
sudo dkms add -m Avalue_driver -v ${version}
sudo dkms build -m Avalue_driver -v ${version}
sudo dkms install -m Avalue_driver -v ${version}
 
# add the kernel module name into /etc/modules
# ex. watchdog
echo "wdt" >> /etc/modules

manual board name in dkms.conf

MAKE=“script/buildall.sh BOARD_NAME=ECM-TGU”

# Default device node
cd /sys/class/misc/dio
 
# Export dio port:
echo 0 > export
 
# Value low/high
echo 0/1 > dio0/value
echo low/high > dio0/value
cat value
 
# Direction input/output
echo 0/1 > dio0/direction
echo input/output > dio0/direction
cat dio0/direction
 
# Unexport dio port:
echo 0 > unexport

Sysfs reference from https://www.kernel.org/doc/Documentation/gpio/sysfs.txt

# Default device node
cd /sys/class/misc/pwm
 
# Change to $device_name(Backlight, Fan_Cpu..) pwm device element as you want
cd $device_name
 
# Value 0x00~0xFF:
echo 0~255 > value
cat value
 
# Level 0~100:
echo 0~100 > level
cat level

# Default device node
cd /sys/class/misc/wdt
 
# Start watchdog countdown:
echo > start
 
# Stop watchdog countdown:
echo > stop
 
# Ping reset watchdog count:
echo > ping
 
# Restart set watchdog count at 1 second, os restart:
echo > restart
 
# Timeleft get watchdog count:
cat timeleft
 
# Timeout set watchdog count at 120 second:
echo 120 > timeout
cat timeout

Sysfs reference from https://www.kernel.org/doc/Documentation/watchdog/watchdog-kernel-api.txt

# Default device node
cd /sys/class/misc/hwm
 
# Change to $device_name(temp_cpu, vin_core..) hwm device element as you want
cd $device_name
 
# Value(R) sensor value or device value:
cat value
 
# Unit(R) Voltage/RPM/Celsius degree:
cat unit
 
# PWM(R/W) Fan only(control pwm)
cat pwm
echo 100 > pwm

# Default device node
cd /sys/class/misc/lvds
 
# Freqency (R/W) Backlight PWM Clock Mode
# 0=> 200, 1=> 300, 2=> 400, 3=> 500, 4=> 700, 5=> 1K,
# 6=> 2K, 7=> 3K, 8=> 5K, 9=> 10K, 0a=>20K
cat frequency
echo 1~10 > frequency
 
# Percentage (R/W) Backlight PWM Percentage
cat percentage
echo 1~100 > percentage
 
# Percentage (R/W) Backlight PWM
cat pwm
echo 0~255 > pwm
 
# Type LVDS panel type for ch7511
# 1024x768, 24/1
# 800x600, 18/1
# 1024x768, 18/1
# 1366x768, 18/1
# 1024x600, 18/1
# 1280x800, 18/1
# 1920x1200, 24/2
# 1920x1080, 24/2
# 1280x1024, 24/2
# 1366x768, 24/1
# 1920x1080, 24/2
# 1680x1050, 24/2
cat type
echo 0~11 > type

# Default device node
cd /sys/class/misc/info
 
# Bios(R) information for bios:
cat bios/*
 
# Board(R) information for board:
cat board/*
 
# Cpu(R) information for cpu:
cat cpu/*
 
# Product(R) information for product:
cat product/*
 
# Ec(R)	information for EC chip:
cat ec/*

# Default device node
cd /sys/class/misc/misc
 
# Change to register_name(usb_standby_power, usb_uptime_power.. ) as you want
cd $register_name

• Define in config/product.h (base on bios BOARD_NAME and /sys/class/dmi/id/board_name)
• More detail in ./doc/index.html
• If have any question, please contact Avalue PM/AE/Sales for help.