[Android] CWM 6.0.2.5 关机充电功能的添加教程。

感谢：Github无私贡献与分享的大量代码；

修改文件：bootable/recovery/extendedcommands.c

修改后的文件对比：diff bootable/recovery/extendedcommands.c.origin bootable/recovery/extendedcommands.c

21a22
> #include <pthread.h>
1537a1539,1633
> 
> //add by linksuce start, cwm off mode charging
> //Origin:github.com/cedesmith/cLK/blob/master/patches/cwm_off_charge_v2.patch
> static int write_file(char* path, void* data, int data_size)
> {
>     int fd;
>     fd = open(path, O_WRONLY);
>     if (fd >= 0) {
>         int written = write(fd, data, data_size);
>         close(fd);
>         return written;
>     }
>     return -1;
> }
> 
> static int read_file(char* path, void* data, int data_size)
> {
>     int fd;
>     fd = open(path, O_RDONLY);
>     if(fd >= 0){
>         int readed = read(fd, data, data_size);
>         close(fd);
>         return readed;
>     }
>     return -1;
> }
> 
> static void* battery_thread(void *cookie)
> {
>     char status[40];
>     int state=-1;
>     int dischargeCount=0;
> 
>     while(1){
>         memset(status, 0, sizeof(status));
>         read_file("/sys/class/power_supply/battery/status", status, sizeof(status)-1);
>         if(strstr(status, "Full")!=NULL && state!=1){
>             state=1;
>             write_file("/sys/class/leds/amber/brightness", "0\n", sizeof("0\n")-1);
>             write_file("/sys/class/leds/green/brightness", "1\n", sizeof("1\n")-1);
>         }else if(strstr(status, "Charging")!=NULL && state!=2){
>             state=2;
>             write_file("/sys/class/leds/amber/brightness", "1\n", sizeof("1\n")-1);
>             write_file("/sys/class/leds/green/brightness", "0\n", sizeof("0\n")-1);
>         }else if(strstr(status, "Discharging")!=NULL){
>             state=3;
>             if(dischargeCount==0){ //blink every 2 seconds
>                 read_file("/sys/class/leds/amber/brightness", status, sizeof(status)-1);
>                 if(status[0]=='0') write_file("/sys/class/leds/amber/brightness", "1\n", sizeof("1\n")-1);
>                 else write_file("/sys/class/leds/amber/brightness", "0\n", sizeof("0\n")-1);
>             }
>             read_file("/sys/class/power_supply/battery/over_vchg", status, sizeof(status)-1);
>             dischargeCount=(dischargeCount+1)%4;
>         }else if(strstr(status,"Not charging")!=NULL && state!=4){
>             state=4;
>             write_file("/sys/class/leds/amber/brightness", "0\n", sizeof("0\n")-1);
>             write_file("/sys/class/leds/green/brightness", "0\n", sizeof("0\n")-1);
>             sync();
>             reboot(RB_POWER_OFF);
>             for(;;);
>         }
>         usleep(500000); //wait half a second
>     }
>     return NULL;
> }
> 
> void handle_chargemode() {
> // old code to read /proc/cmdline was broken because file size is always 0 so file_data was always empty string
>     char cmdline[1024];
>     memset(cmdline, 0, sizeof(cmdline));
>     if(read_file("/proc/cmdline", cmdline, sizeof(cmdline)-1) < 0) return;
> 
>     if (strstr(cmdline, "androidboot.mode=offmode_charging") != NULL)
>     {
>         write_file("/sys/class/leds/lcd-backlight/brightness", "0\n", sizeof("0\n")-1);
>         write_file("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", "powersave\n", sizeof("powersave\n")-1);
>         write_file("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq", "245000\n", sizeof("245000\n")-1);
>         write_file("/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed", "245000\n", sizeof("245000\n")-1);
> 
>         pthread_t t;
>         pthread_create(&t, NULL, battery_thread, NULL);
> 
>         // let recovery kernel charge the battery, reboot on any key press so Android will start as user would expect
> //        ev_init();
>         struct input_event ev;
>         do {
>             ev_get(&ev, 0);
>             if(ev.type==EV_KEY) write_file("/sys/class/leds/lcd-backlight/brightness", "0\n", sizeof("0\n")-1);
>         } while (!(ev.type==EV_KEY && ev.code==KEY_END));
> 
>         reboot(RB_AUTOBOOT);
>         for(;;);
>     }
> }
> // add by linkscue end, cwm off mode charging