Openwrt Support RESET Button (5)

1 Scope of Document
This document describes how to support reset button under openwrt system
2 Requiremen
2.1 Function Requirement
NA
2.2 Performance Requirement
NA
3 Hardware Overview
NA

4 Functional Description
4.1 Functional Block Diagram
NA

5 Porting
5.1 Kernel porting
Change dts for support reset button

gpio-keys-polled {
compatible = "gpio-keys-polled";
#address-cells = <1>;
#size-cells = <0>;
poll-interval = <20>;
reset {
label = "reset";
gpios = <&gpio0 1 1>;
linux,code = <0x198>;
};
};
corresponding to platfrom resoure struct

struct gpio_keys_button {
/* Configuration parameters */
unsigned int code; /* input event code (KEY_*, SW_*) *///上报事件的code
int gpio;//所用的gpio引脚
int active_low;//是否低电平有效
const char *desc; //该按键的描述符
unsigned int type; /* input event type (EV_KEY, EV_SW, EV_ABS) */
int wakeup; /* configure the button as a wake-up source */
int debounce_interval; /* debounce ticks interval in msecs */
bool can_disable;
int value; /* axis value for EV_ABS */
};

5.2 System configure
Reference: https://openwrt.org/docs/techref/sysupgrade
Openwrt official innet use /bin/sysupgreade to do system upgrade
We can extrace the simplest implementation method:

#!/bin/sh

add_conffiles() {
rm $1 2>/dev/null
local file="$1"
( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
/lib/upgrade/keep.d/* 2>/dev/null) \
-type f 2>/dev/null;
opkg list-changed-conffiles) | sort -u > "$file"
return 0
}

do_save_conffiles() {
local conf_tar="$1"
local conf_files="$2"
tar zcf "$conf_tar" -T "$conf_files" 2>/dev/null
# rm -f "$2"
}

do_restore_conffiles() {

[ -e "$1" ] && tar -C /tmp/tmptest -xzf "$1"

}

if [ "$1" == "backup" ]
then
add_conffiles /mnt/backfile
do_save_conffiles /mnt/backfile.tar.gz /mnt/backfile
else
mkdir /tmp/tmptest > 2>/dev/null
do_restore_conffiles /mnt/backfile.tar.gz
# need add do restart relate system service
fi