android 电池(二):android关机充电流程、充电画面显示
android 电池(二):android关机充电流程、充电画面显示
ZZZ:http://blog.csdn.net/xubin341719/article/details/8498580
分类:S5PXX(三星) 2013-01-13 18:50 14511人阅读 评论(15) 收藏 举报关键词:android电池关机充电androidboot.mode charger关机充电 充电画面显示
平台信息:
内核:linux2.6/linux3.0
系统:android/android4.0
平台:S5PV310(samsungexynos 4210)
作者:xubin341719(欢迎转载,请注明作者)
欢迎指正错误,共同学习、共同进步!!
android 电池(一):锂电池基本原理篇
android 电池(二):android关机充电流程、充电画面显示
android 电池(三):android电池系统
android电池(四):电池 电量计(MAX17040)驱动分析篇
android电池(五):电池 充电IC(PM2301)驱动分析篇
上一篇我们讲了锂电池的充放电的流程和电池的一些特性,这一节我们重点说一下android关机充电是怎么、充电画面显示是怎么实现的,这个在工作中也比较有用,我们开始做这一块的时候也走了不少的弯路。我记得我们做adnroid2.3的时候,关机状态和充电logo显示是在uboot中做的。应该是有两种做法,回头我再看下uboot中做画面显示那一块是怎么做的,这一节我们重点说系统中的充电logo显示。
一、android正常开机流程、关机充电流程
在写这篇文章之前我们先看两个流程:正常开机流程,关机充电系统启动流程
1、正常开机流程,按开机键。
可大致分成三部分
(1)、OS_level:UBOOT、kenrel、init这三步完成系统启动;
(2)、Android_level:这部分完成android部的初始化;
(3)、Home Screen:这部分就是我们看到的launcher部分。
2、关机充电系统启动流程
与前面相比,这个流程只走到init这一部分,就没有往后走了,这部分我们会在后面的代码中分析。
二、关机充电逻辑硬件逻辑
1、插入DC,charger IC从硬件上唤醒系统,相当于长按开机键开机。
下面这部分是charger IC连接系统的控制部分。
三、软件逻辑。
DC插入,其实相当于关机状态下“按开机键”开机。第一步要走UBOOT、kernel 、android init这一流程。
1、UBOOT
UBOOT启动代码我们不在这里详细分析,这里我们只要注意二个问题:
a:如何判断是DC插入;
b:设定setenv("bootargs", "androidboot.mode=charger"),androidboot.mode这个参数相当重要,这个参数决定系统是正常启动、还是关机充电状态。
Uboot/board/samsung/smdk4212/smkd4212.c
[cpp] view plain copy- intboard_late_init(void)
- {
- intkeystate=0;
- printf("checkstartmode\n");
- if((*(int*)0x10020800==0x19721212)||(*(int*)0x10020804==0x19721212)
- ||(*(int*)0x10020808==0x19721212))//(1)、检查是否有DC插入;
- {
- setenv("bootargs","");//(2)、没有DC插入;
- }else{//DC插入
- inttmp=*(int*)0x11000c08;
- *(int*)0x10020800=*(int*)0x10020804=0x19721212;
- *(int*)0x11000c08=(tmp&(~0xc000))|0xc000;
- udelay(10000);
- if((*(int*)0x11000c04&0x80)!=0x80&&INF_REG4_REG!=0xf){
- setenv("bootargs","androidboot.mode=charger");//(3)、设定bootargs为charger状态
- printf("chargermode\n");
- }else{
- setenv("bootargs","");
- }
- *(int*)0x11000c08=tmp;
- }
- #ifdefCONFIG_CPU_EXYNOS4X12
- intcharge_status=CheckBatteryLow();//(4)、检查电池电量;
- keystate=board_key_check();//(5)、检查按键状态;
- //fusebootloader
- if(second_boot_info!=0){
- boot_symbol=1;
- INF_REG2_REG=0x8;
- run_command(CONFIG_BOOTCMD_FUSE_BOOTLOADER,NULL);
- }
- if((INF_REG4_REG==0xd)){
- //rebootdefault
- charbuf[10];
- sprintf(buf,"%d",CONFIG_BOOTDELAY);
- setenv("bootdelay",buf);
- setenv("reserved",NULL);
- saveenv();
- }elseif((INF_REG4_REG==0xe)||keystate==(0x1|0x2)){//(6)、按键进入fastboot模式;
- //rebootbootloader
- boot_symbol=1;
- INF_REG2_REG=0x8;
- printf("BOOTLOADER-FASTBOOT\n");
- setenv("reserved","fastboot");
- setenv("bootdelay","0");
- }elseif((INF_REG4_REG==0xf)||keystate==(0x1|0x2|0x4)){//(7)、按键进入recovery模式;
- //rebootrecovery
- printf("BOOTLOADER-RECOVERY\n");
- boot_symbol=1;
- INF_REG2_REG=0x8;
- setenv("reserved",CONFIG_BOOTCMD_RECOVERY);
- setenv("bootdelay","0");
- }else
- if(keystate==(0x1|0x4)||second_boot_info!=0||partition_check()){//(8)、按键进入卡升级模式;
- //2ndboot
- printf("BOOTLOADER-2NDBOOTDEVICE\n");
- boot_symbol=1;
- INF_REG2_REG=0x8;
- setenv("bootcmd",CONFIG_BOOTCOMMAND);
- setenv("reserved",CONFIG_BOOTCMD_FUSE_RELEASE);
- setenv("bootdelay","0");
- }else{//(9)、正常启动;
- //normalcase
- charbuf[10];
- sprintf(buf,"%d",CONFIG_BOOTDELAY);
- setenv("bootdelay",buf);
- }
- INF_REG4_REG=0;
- return0;
- }
(1)、检查是否有DC插入;
[cpp] view plain copy- if((*(int*)0x10020800==0x19721212)||(*(int*)0x10020804==0x19721212)
- (*(int*)0x10020808==0x19721212))
这部分检查寄存器的值。
(2)、没有DC插入;
(3)、设定bootargs为charger状态
[cpp] view plain copy- if((*(int*)0x11000c04&0x80)!=0x80&&INF_REG4_REG!=0xf){
- setenv("bootargs","androidboot.mode=charger");
这是这部分的重点,如果能过寄存器判断是DC插入,把androidboot.mode设定为charger状态。
以下这部分根据需要加入,通过判断不同的情况进入不同的功能,如fastboot\revovery…………,这部分不做详细解释。
(4)、检查电池电量;
这个在正常开机状态下,如果检测电量太低,则不开机,这部分代码就不做分析。
(5)、检查按键状态;
我们这个平台有几种模式:fastboot\recovery\卡升级等……
(6)、按键进入fastboot模式;
(7)、按键进入recovery模式;
(8)、按键进入卡升级模式
(9)、正常启动;
2、kernel
这部分和正常启动是一样的。
3、init
前面所有的描述其实只有一点和正常启动不太一样,那就是在UBOOT中把androidboot.mode设定为charger状态,内核正常流程启动,然后到init时要对charger这种状态处理。
system\core\init\init.c
[cpp] view plain copy- intmain(intargc,char**argv)
- {
- ………………
- action_for_each_trigger("early-init",action_add_queue_tail);
- queue_builtin_action(wait_for_coldboot_done_action,"wait_for_coldboot_done");
- queue_builtin_action(property_init_action,"property_init");
- queue_builtin_action(keychord_init_action,"keychord_init");
- queue_builtin_action(console_init_action,"console_init");//(1)、显示initlogo.rle,也就是android第二张图片;
- queue_builtin_action(set_init_properties_action,"set_init_properties");
- /*executeallthebootactionstogetusstarted*/
- action_for_each_trigger("init",action_add_queue_tail);
- /*skipmountingfilesystemsinchargermode*/
- if(strcmp(bootmode,"charger")!=0){//(2)、这里就是UBOOT中设定的bootmode,如果是charger模式,跳过下面初始化;
- action_for_each_trigger("early-fs",action_add_queue_tail);
- action_for_each_trigger("fs",action_add_queue_tail);
- action_for_each_trigger("post-fs",action_add_queue_tail);
- action_for_each_trigger("post-fs-data",action_add_queue_tail);
- }
- queue_builtin_action(property_service_init_action,"property_service_init");
- queue_builtin_action(signal_init_action,"signal_init");
- queue_builtin_action(check_startup_action,"check_startup");
- if(!strcmp(bootmode,"charger")){//(3)、如果为charger,则调用charger.c。
- action_for_each_trigger("charger",action_add_queue_tail);
- }else{
- action_for_each_trigger("early-boot",action_add_queue_tail);
- action_for_each_trigger("boot",action_add_queue_tail);
- }
- ……………………
- }
(1)、显示initlogo.rle,也就是android第二张图片;
queue_builtin_action(console_init_action,"console_init");调用console_init_action
[cpp] view plain copy- staticintconsole_init_action(intnargs,char**args)
- {
- intfd;
- chartmp[PROP_VALUE_MAX];
- if(console[0]){
- snprintf(tmp,sizeof(tmp),"/dev/%s",console);
- console_name=strdup(tmp);
- }
- fd=open(console_name,O_RDWR);
- if(fd>=0)
- have_console=1;
- close(fd);
- if(load_565rle_image(INIT_IMAGE_FILE)){//这里定义rle文件的名称#defineINIT_IMAGE_FILE"/initlogo.rle"
- fd=open("/dev/tty0",O_WRONLY);
- if(fd>=0){//如果没有这张图片,就显示android字样,在屏幕左上角;
- constchar*msg;
- msg="\n"
- "\n"
- "\n"//consoleis40colsx30lines
- "\n"
- "\n"
- "\n"
- "\n"
- "\n"
- "\n"
- "\n"
- "ANDROID";
- write(fd,msg,strlen(msg));
- close(fd);
- }
- }
- return0;
- }
(2)、这里就是UBOOT中设定的bootmode,如果是charger模式,跳过下面初始化;
[cpp] view plain copy- /*skipmountingfilesystemsinchargermode*/
- if(strcmp(bootmode,"charger")!=0){
- action_for_each_trigger("early-fs",action_add_queue_tail);
- action_for_each_trigger("fs",action_add_queue_tail);
- action_for_each_trigger("post-fs",action_add_queue_tail);
- action_for_each_trigger("post-fs-data",action_add_queue_tail);
- }
(3)、如果为charger,则调用charger.c
[cpp] view plain copy- action_for_each_trigger("charger",action_add_queue_tail);
我们在后面细分charger这部分。
4、charger.c
这部分就是我们充电部分,充电画面显示的实现。
system\core\charger\charger.c
[cpp] view plain copy- intmain(intargc,char**argv)
- {
- ………………
- klog_set_level(CHARGER_KLOG_LEVEL);
- dump_last_kmsg();
- LOGI("---------------STARTINGCHARGERMODE---------------\n");
- gr_init();
- gr_font_size(&char_width,&char_height);//(1)、初始化graphics,包括buf大小;
- ev_init(input_callback,charger);//(2)初始化按键;
- fd=uevent_open_socket(64*1024,true);
- if(fd>=0){
- fcntl(fd,F_SETFL,O_NONBLOCK);
- ev_add_fd(fd,uevent_callback,charger);
- }
- charger->uevent_fd=fd;
- coldboot(charger,"/sys/class/power_supply","add");//(3)、创建/sys/class/power_supply结点,把socket信息通知应用层;
- ret=res_create_surface("charger/battery_fail",&charger->surf_unknown);
- if(ret<0){
- LOGE("Cannotloadimage\n");
- charger->surf_unknown=NULL;
- }
- for(i=0;i<charger->batt_anim->num_frames;i++){//(4)、这里是显示chargerlogo,res_create_surface显示图片函数;
- structframe*frame=&charger->batt_anim->frames[i];
- ret=res_create_surface(frame->name,&frame->surface);
- if(ret<0){
- LOGE("Cannotloadimage%s\n",frame->name);
- /*TODO:freethealreadyallocatedsurfaces...*/
- charger->batt_anim->num_frames=0;
- charger->batt_anim->num_cycles=1;
- break;
- }
- }
- ev_sync_key_state(set_key_callback,charger);
- gr_fb_blank(true);
- charger->next_screen_transition=now-1;
- charger->next_key_check=-1;
- charger->next_pwr_check=-1;
- reset_animation(charger->batt_anim);
- kick_animation(charger->batt_anim);
- event_loop(charger);//(5)、event_loop循环,电池状态,检测按键是否按下;
- return0;
- }
(1)、初始化graphics,包括buf大小
android/bootable/recovery/minui/graphics.c
gr_init():minui/graphics.c[settty0 to graphic mode, open fb0],设制tty0为图形模式,打开fb0;
[cpp] view plain copy- intgr_init(void)
- {
- gglInit(&gr_context);
- GGLContext*gl=gr_context;
- gr_init_font();
- gr_vt_fd=open("/dev/tty0",O_RDWR|O_SYNC);
- if(gr_vt_fd<0){
- //Thisisnon-fatal;post-Cupcakekernelsdon'thavetty0.
- perror("can'topen/dev/tty0");
- }elseif(ioctl(gr_vt_fd,KDSETMODE,(void*)KD_GRAPHICS)){
- //However,ifwedoopentty0,weexpecttheioctltowork.
- perror("failedKDSETMODEtoKD_GRAPHICSontty0");
- gr_exit();
- return-1;
- }
- gr_fb_fd=get_framebuffer(gr_framebuffer);
- if(gr_fb_fd<0){
- gr_exit();
- return-1;
- }
- get_memory_surface(&gr_mem_surface);
- fprintf(stderr,"framebuffer:fd%d(%dx%d)\n",
- gr_fb_fd,gr_framebuffer[0].width,gr_framebuffer[0].height);
- /*startwith0asfront(displayed)and1asback(drawing)*/
- gr_active_fb=0;
- set_active_framebuffer(0);
- gl->colorBuffer(gl,&gr_mem_surface);
- gl->activeTexture(gl,0);
- gl->enable(gl,GGL_BLEND);
- gl->blendFunc(gl,GGL_SRC_ALPHA,GGL_ONE_MINUS_SRC_ALPHA);
- gr_fb_blank(true);
- gr_fb_blank(false);
- return0;
- }
(2)android/bootable/recovery/minui/events.c
ev_init():minui/events.c[open /dev/input/event*]打开 /dev/input/event*
这部分是在,充电状态下,按键操作的初始化,比如:短按显示充电logo,长按开机,初始化代码如下。
[cpp] view plain copy- intev_init(ev_callbackinput_cb,void*data)
- {
- DIR*dir;
- structdirent*de;
- intfd;
- dir=opendir("/dev/input");//打开驱动结点;
- if(dir!=0){
- while((de=readdir(dir))){
- unsignedlongev_bits[BITS_TO_LONGS(EV_MAX)];
- //fprintf(stderr,"/dev/input/%s\n",de->d_name);
- if(strncmp(de->d_name,"event",5))continue;
- fd=openat(dirfd(dir),de->d_name,O_RDONLY);
- if(fd<0)continue;
- /*readtheevbitsoftheinputdevice*/
- if(ioctl(fd,EVIOCGBIT(0,sizeof(ev_bits)),ev_bits)<0){
- close(fd);
- continue;
- }
- /*TODO:addabilitytospecifyeventmasks.Fornow,justassume
- *thatonlyEV_KEYandEV_RELeventtypesareeverneeded.*/
- if(!test_bit(EV_KEY,ev_bits)&&!test_bit(EV_REL,ev_bits)){
- close(fd);
- continue;
- }
- ev_fds[ev_count].fd=fd;
- ev_fds[ev_count].events=POLLIN;
- ev_fdinfo[ev_count].cb=input_cb;
- ev_fdinfo[ev_count].data=data;
- ev_count++;
- ev_dev_count++;
- if(ev_dev_count==MAX_DEVICES)break;
- }
- }
- return0;
- }
(3)、创建/sys/class/power_supply结点,把socket信息通知应用层
uevent_open_socket这个函数是通过kobject_uevent的方式通知的应用层,就是往一个socket广播一个消息,只需要在应用层打开socket监听NETLINK_KOBJECT_UEVENT组的消息,就可以收到了,主要是创建了socket接口获得uevent的文件描述符,然后触发/sys/class/power_supply目录及其子目录下的uevent,然后接受并创建设备节点,至此设备节点才算创建。
(4)、这里显示charger logo,res_create_surface显示图片函数;
res_create_surface:minui/resource.c[create surfaces for all bitmaps used later, include icons, bmps]
创建surface为所以的位图,包括图标、位图。 这些图片的位置为:system\core\charger\images
(5)、event_loop循环,电池状态,检测按键是否按下;
5、event_loop
这个函数判断按键状态,DC是否插拔。如果长按开机:执行android_reboot(ANDROID_RB_RESTART,0, 0);如果拔出DC:执行android_reboot(ANDROID_RB_POWEROFF,0, 0);
[cpp] view plain copy- staticvoidevent_loop(structcharger*charger)
- {
- intret;
- while(true){
- int64_tnow=curr_time_ms();//(1)、获得当前时间;
- LOGV("[%lld]event_loop()\n",now);
- handle_input_state(charger,now);//(2)、检查按键状态;
- handle_power_supply_state(charger,now);//(3)、检查DC是否拔出;
- /*doscreenupdatelastincaseanyoftheabovewanttostart
- *screentransitions(animations,etc)
- */
- update_screen_state(charger,now);//(4)、对按键时间状态标志位的判断,显示不同电量的充电logo;
- wait_next_event(charger,now);
- }
- }
(1)、获得当前时间;
int64_t now = curr_time_ms();
这个时间来判断,有没有屏幕超时,如果超时关闭屏幕充电logo显示。
(2)、检查按键状态;
[cpp] view plain copy- staticvoidhandle_input_state(structcharger*charger,int64_tnow)
- {
- process_key(charger,KEY_POWER,now);
- if(charger->next_key_check!=-1&&now>charger->next_key_check)
- charger->next_key_check=-1;
- }
- 我们再看下:process_key(charger,KEY_POWER,now);
- staticvoidprocess_key(structcharger*charger,intcode,int64_tnow)
- {
- ………………
- if(code==KEY_POWER){
- if(key->down){
- int64_treboot_timeout=key->timestamp+POWER_ON_KEY_TIME;
- if(now>=reboot_timeout){//如果长按power键,就重新启动,也就是重启开机;
- LOGI("[%lld]rebooting\n",now);
- android_reboot(ANDROID_RB_RESTART,0,0);//重启命令;
- }
- ………………
- }
- key->pending=false;
- }
(3)、检查DC是否拔出;
handle_power_supply_state(charger, now);
[cpp] view plain copy- staticvoidhandle_power_supply_state(structcharger*charger,int64_tnow)
- {
- if(charger->num_supplies_online==0){
- if(charger->next_pwr_check==-1){
- charger->next_pwr_check=now+UNPLUGGED_SHUTDOWN_TIME;
- LOGI("[%lld]deviceunplugged:shuttingdownin%lld(@%lld)\n",
- now,UNPLUGGED_SHUTDOWN_TIME,charger->next_pwr_check);
- }elseif(now>=charger->next_pwr_check){
- LOGI("[%lld]shuttingdown\n",now);
- android_reboot(ANDROID_RB_POWEROFF,0,0);//如果DC拔出,则关机;
- }
- ………………
- }
(4)、对按键时间状态标志位的判断,显示不同电量的充电logo;
update_screen_state(charger, now);
这个函数比较长了,其实做用就是:我们在状态的过程中,充电logo的电量是要增加的,比如电量是20%时,要从第一格开始闪烁;如果是80%时,则要从第三格开始闪烁,电量显示就是通过这个函数来计算实现的。
[cpp] view plain copy- staticvoidupdate_screen_state(structcharger*charger,int64_tnow)
- {
- structanimation*batt_anim=charger->batt_anim;
- intcur_frame;
- intdisp_time;
- if(!batt_anim->run||now<charger->next_screen_transition)
- return;
- /*animationisover,blankscreenandleave*/
- if(batt_anim->cur_cycle==batt_anim->num_cycles){
- reset_animation(batt_anim);
- charger->next_screen_transition=-1;
- gr_fb_blank(true);
- LOGV("[%lld]animationdone\n",now);
- return;
- }
- disp_time=batt_anim->frames[batt_anim->cur_frame].disp_time;
- /*animationstarting,setuptheanimation*/
- if(batt_anim->cur_frame==0){
- intbatt_cap;
- intret;
- LOGV("[%lld]animationstarting\n",now);
- batt_cap=get_battery_capacity(charger);
- if(batt_cap>=0&&batt_anim->num_frames!=0){
- inti;
- /*findfirstframegivencurrentcapacity*/
- for(i=1;i<batt_anim->num_frames;i++){
- if(batt_cap<batt_anim->frames[i].min_capacity)
- break;
- }
- batt_anim->cur_frame=i-1;
- /*showthefirstframefortwiceaslong*/
- disp_time=batt_anim->frames[batt_anim->cur_frame].disp_time*2;
- }
- batt_anim->capacity=batt_cap;
- }
- /*unblankthescreenonfirstcycle*/
- if(batt_anim->cur_cycle==0)
- gr_fb_blank(false);
- /*drawthenewframe(@cur_frame)*/
- redraw_screen(charger);
- /*ifwedon'thaveanimframes,weonlyhaveoneimage,sojustbump
- *thecyclecounterandexit
- */
- if(batt_anim->num_frames==0||batt_anim->capacity<0){
- LOGV("[%lld]animationmissingorunknownbatterystatus\n",now);
- charger->next_screen_transition=now+BATTERY_UNKNOWN_TIME;
- batt_anim->cur_cycle++;
- return;
- }
- /*schedulenextscreentransition*/
- charger->next_screen_transition=now+disp_time;
- /*advanceframecntrtothenextvalidframe
- *ifnecessary,advancecyclecntr,andresetframecntr
- */
- batt_anim->cur_frame++;
- /*iftheframeisusedforlevel-only,thatisonlyshowitwhenit's
- *thecurrentlevel,skipitduringtheanimation.
- */
- while(batt_anim->cur_frame<batt_anim->num_frames&&
- batt_anim->frames[batt_anim->cur_frame].level_only)
- batt_anim->cur_frame++;
- if(batt_anim->cur_frame>=batt_anim->num_frames){
- batt_anim->cur_cycle++;
- batt_anim->cur_frame=0;
- /*don'tresetthecyclecounter,sinceweusethatasasignal
- *inatestabovetocheckifanimationisover
- */
- }
- }
下面是不能容量时显示logo的函数:
[cpp] view plain copy- staticstructframebatt_anim_frames[]={
- {
- .name="charger/battery_0",
- .disp_time=750,
- .min_capacity=0,
- },
- {
- .name="charger/battery_1",
- .disp_time=750,
- .min_capacity=20,
- },
- {
- .name="charger/battery_2",
- .disp_time=750,
- .min_capacity=40,
- },
- {
- .name="charger/battery_3",
- .disp_time=750,
- .min_capacity=60,
- },
- {
- .name="charger/battery_4",
- .disp_time=750,
- .min_capacity=80,
- .level_only=true,
- },
- {
- .name="charger/battery_5",
- .disp_time=750,
- .min_capacity=BATTERY_FULL_THRESH,
- },
- };
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