android 电池（二）：android关机充电流程、充电画面显示 .
2013-08-21 14:21
525 查看
http://blog.csdn.net/xubin341719/article/details/8498580
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 plaincopyprint?
int board_late_init (void)
{
int keystate = 0;
printf("check start mode\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
int tmp=*(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("charger mode\n");
} else {
setenv ("bootargs", "");
}
*(int *)0x11000c08=tmp;
}
#ifdef CONFIG_CPU_EXYNOS4X12
int charge_status=CheckBatteryLow();//（4）、检查电池电量；
keystate=board_key_check();//（5）、检查按键状态；
// fuse bootloader
if(second_boot_info != 0) {
boot_symbol=1;
INF_REG2_REG =0x8;
run_command(CONFIG_BOOTCMD_FUSE_BOOTLOADER, NULL);
}
if((INF_REG4_REG == 0xd)) {
// reboot default
char buf[10];
sprintf(buf, "%d", CONFIG_BOOTDELAY);
setenv ("bootdelay", buf);
setenv ("reserved", NULL);
saveenv();
} else if((INF_REG4_REG == 0xe) || keystate == (0x1 | 0x2)) {//（6）、按键进入fastboot模式；
// reboot bootloader
boot_symbol=1;
INF_REG2_REG =0x8;
printf("BOOTLOADER - FASTBOOT\n");
setenv ("reserved", "fastboot");
setenv ("bootdelay", "0");
} else if((INF_REG4_REG == 0xf) || keystate == (0x1 | 0x2 | 0x4)) {//（7）、按键进入recovery模式；
// reboot recovery
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；
// 2nd boot
printf("BOOTLOADER - 2ND BOOT DEVICE\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；
// normal case
char buf[10];
sprintf(buf, "%d", CONFIG_BOOTDELAY);
setenv ("bootdelay", buf);
}
INF_REG4_REG = 0;
return 0;
}
（1）、检查是否有DC插入；
[cpp]
view plaincopyprint?
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 plaincopyprint?
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 plaincopyprint?
int main(int argc, 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");
/* execute all the boot actions to get us started */
action_for_each_trigger("init", action_add_queue_tail);
/* skip mounting filesystems in charger mode */
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 plaincopyprint?
static int console_init_action(int nargs, char **args)
{
int fd;
char tmp[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#define INIT_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；
const char *msg;
msg = "\n"
"\n"
"\n" // console is 40 cols x 30 lines
"\n"
"\n"
"\n"
"\n"
"\n"
"\n"
"\n"
" A N D R O I D ";
write(fd, msg, strlen(msg));
close(fd);
}
}
return 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；
[cpp]
view plaincopyprint?
/* skip mounting filesystems in charger mode */
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 plaincopyprint?
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 plaincopyprint?
int main(int argc, char **argv)
{
………………
klog_set_level(CHARGER_KLOG_LEVEL);
dump_last_kmsg();
LOGI("--------------- STARTING CHARGER MODE ---------------\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("Cannot load image\n");
charger->surf_unknown = NULL;
}
for (i = 0; i < charger->batt_anim->num_frames; i++) {//(4)、这里是显示charger logo，res_create_surface显示图片函数；
struct frame *frame = &charger->batt_anim->frames[i];
ret = res_create_surface(frame->name, &frame->surface);
if (ret < 0) {
LOGE("Cannot load image %s\n", frame->name);
/* TODO: free the already allocated surfaces... */
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；
return 0;
}
(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 plaincopyprint?
int gr_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) {
// This is non-fatal; post-Cupcake kernels don't have tty0.
perror("can't open /dev/tty0");
} else if (ioctl(gr_vt_fd, KDSETMODE, (void*) KD_GRAPHICS)) {
// However, if we do open tty0, we expect the ioctl to work.
perror("failed KDSETMODE to KD_GRAPHICS on tty0");
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 (%d x %d)\n",
gr_fb_fd, gr_framebuffer[0].width, gr_framebuffer[0].height);
/* start with 0 as front (displayed) and 1 as back (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);
return 0;
}
(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 plaincopyprint?
int ev_init(ev_callback input_cb, void *data)
{
DIR *dir;
struct dirent *de;
int fd;
dir = opendir("/dev/input");//打开驱动结点；
if(dir != 0) {
while((de = readdir(dir))) {
unsigned long ev_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;
/* read the evbits of the input device */
if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) < 0) {
close(fd);
continue;
}
/* TODO: add ability to specify event masks. For now, just assume
* that only EV_KEY and EV_REL event types are ever needed. */
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;
}
}
return 0;
}
(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 plaincopyprint?
static void event_loop(struct charger *charger)
{
int ret;
while (true) {
int64_t now = 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；
/* do screen update last in case any of the above want to start
* screen transitions (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 plaincopyprint?
static void handle_input_state(struct charger *charger, int64_t now)
{
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);
static void process_key(struct charger *charger, int code, int64_t now)
{
………………
if (code == KEY_POWER) {
if (key->down) {
int64_t reboot_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 plaincopyprint?
static void handle_power_supply_state(struct charger *charger, int64_t now)
{
if (charger->num_supplies_online == 0) {
if (charger->next_pwr_check == -1) {
charger->next_pwr_check = now + UNPLUGGED_SHUTDOWN_TIME;
LOGI("[%lld] device unplugged: shutting down in %lld (@ %lld)\n",
now, UNPLUGGED_SHUTDOWN_TIME, charger->next_pwr_check);
} else if (now >= charger->next_pwr_check) {
LOGI("[%lld] shutting down\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 plaincopyprint?
static void update_screen_state(struct charger *charger, int64_t now)
{
struct animation *batt_anim = charger->batt_anim;
int cur_frame;
int disp_time;
if (!batt_anim->run || now < charger->next_screen_transition)
return;
/* animation is over, blank screen and leave */
if (batt_anim->cur_cycle == batt_anim->num_cycles) {
reset_animation(batt_anim);
charger->next_screen_transition = -1;
gr_fb_blank(true);
LOGV("[%lld] animation done\n", now);
return;
}
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time;
/* animation starting, set up the animation */
if (batt_anim->cur_frame == 0) {
int batt_cap;
int ret;
LOGV("[%lld] animation starting\n", now);
batt_cap = get_battery_capacity(charger);
if (batt_cap >= 0 && batt_anim->num_frames != 0) {
int i;
/* find first frame given current capacity */
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;
/* show the first frame for twice as long */
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time * 2;
}
batt_anim->capacity = batt_cap;
}
/* unblank the screen on first cycle */
if (batt_anim->cur_cycle == 0)
gr_fb_blank(false);
/* draw the new frame (@ cur_frame) */
redraw_screen(charger);
/* if we don't have anim frames, we only have one image, so just bump
* the cycle counter and exit
*/
if (batt_anim->num_frames == 0 || batt_anim->capacity < 0) {
LOGV("[%lld] animation missing or unknown battery status\n", now);
charger->next_screen_transition = now + BATTERY_UNKNOWN_TIME;
batt_anim->cur_cycle++;
return;
}
/* schedule next screen transition */
charger->next_screen_transition = now + disp_time;
/* advance frame cntr to the next valid frame
* if necessary, advance cycle cntr, and reset frame cntr
*/
batt_anim->cur_frame++;
/* if the frame is used for level-only, that is only show it when it's
* the current level, skip it during the animation.
*/
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't reset the cycle counter, since we use that as a signal
* in a test above to check if animation is over
*/
}
}
下面是不能容量时显示logo的函数：
[cpp]
view plaincopyprint?
static struct frame batt_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,
},
};
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 plaincopyprint?
int board_late_init (void)
{
int keystate = 0;
printf("check start mode\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
int tmp=*(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("charger mode\n");
} else {
setenv ("bootargs", "");
}
*(int *)0x11000c08=tmp;
}
#ifdef CONFIG_CPU_EXYNOS4X12
int charge_status=CheckBatteryLow();//（4）、检查电池电量；
keystate=board_key_check();//（5）、检查按键状态；
// fuse bootloader
if(second_boot_info != 0) {
boot_symbol=1;
INF_REG2_REG =0x8;
run_command(CONFIG_BOOTCMD_FUSE_BOOTLOADER, NULL);
}
if((INF_REG4_REG == 0xd)) {
// reboot default
char buf[10];
sprintf(buf, "%d", CONFIG_BOOTDELAY);
setenv ("bootdelay", buf);
setenv ("reserved", NULL);
saveenv();
} else if((INF_REG4_REG == 0xe) || keystate == (0x1 | 0x2)) {//（6）、按键进入fastboot模式；
// reboot bootloader
boot_symbol=1;
INF_REG2_REG =0x8;
printf("BOOTLOADER - FASTBOOT\n");
setenv ("reserved", "fastboot");
setenv ("bootdelay", "0");
} else if((INF_REG4_REG == 0xf) || keystate == (0x1 | 0x2 | 0x4)) {//（7）、按键进入recovery模式；
// reboot recovery
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；
// 2nd boot
printf("BOOTLOADER - 2ND BOOT DEVICE\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；
// normal case
char buf[10];
sprintf(buf, "%d", CONFIG_BOOTDELAY);
setenv ("bootdelay", buf);
}
INF_REG4_REG = 0;
return 0;
}
int board_late_init (void)
{
int keystate = 0;
printf("check start mode\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
int tmp=*(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("charger mode\n");
} else {
setenv ("bootargs", "");
}
*(int *)0x11000c08=tmp;
}
#ifdef CONFIG_CPU_EXYNOS4X12
int charge_status=CheckBatteryLow();//（4）、检查电池电量；
keystate=board_key_check();//（5）、检查按键状态；
// fuse bootloader
if(second_boot_info != 0) {
boot_symbol=1;
INF_REG2_REG =0x8;
run_command(CONFIG_BOOTCMD_FUSE_BOOTLOADER, NULL);
}
if((INF_REG4_REG == 0xd)) {
// reboot default
char buf[10];
sprintf(buf, "%d", CONFIG_BOOTDELAY);
setenv ("bootdelay", buf);
setenv ("reserved", NULL);
saveenv();
} else if((INF_REG4_REG == 0xe) || keystate == (0x1 | 0x2)) {//（6）、按键进入fastboot模式；
// reboot bootloader
boot_symbol=1;
INF_REG2_REG =0x8;
printf("BOOTLOADER - FASTBOOT\n");
setenv ("reserved", "fastboot");
setenv ("bootdelay", "0");
} else if((INF_REG4_REG == 0xf) || keystate == (0x1 | 0x2 | 0x4)) {//（7）、按键进入recovery模式；
// reboot recovery
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；
// 2nd boot
printf("BOOTLOADER - 2ND BOOT DEVICE\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；
// normal case
char buf[10];
sprintf(buf, "%d", CONFIG_BOOTDELAY);
setenv ("bootdelay", buf);
}
INF_REG4_REG = 0;
return 0;
}（1）、检查是否有DC插入；
[cpp]
view plaincopyprint?
if ((*(int *)0x10020800==0x19721212) || (*(int *)0x10020804==0x19721212)
(*(int *)0x10020808==0x19721212))
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 plaincopyprint?
if ((*(int *)0x11000c04 & 0x80)!=0x80 && INF_REG4_REG != 0xf) {
setenv ("bootargs", "androidboot.mode=charger");
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 plaincopyprint?
int main(int argc, 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");
/* execute all the boot actions to get us started */
action_for_each_trigger("init", action_add_queue_tail);
/* skip mounting filesystems in charger mode */
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);
}
……………………
}
int main(int argc, 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");
/* execute all the boot actions to get us started */
action_for_each_trigger("init", action_add_queue_tail);
/* skip mounting filesystems in charger mode */
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 plaincopyprint?
static int console_init_action(int nargs, char **args)
{
int fd;
char tmp[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#define INIT_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；
const char *msg;
msg = "\n"
"\n"
"\n" // console is 40 cols x 30 lines
"\n"
"\n"
"\n"
"\n"
"\n"
"\n"
"\n"
" A N D R O I D ";
write(fd, msg, strlen(msg));
close(fd);
}
}
return 0;
}
static int console_init_action(int nargs, char **args)
{
int fd;
char tmp[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#define INIT_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；
const char *msg;
msg = "\n"
"\n"
"\n" // console is 40 cols x 30 lines
"\n"
"\n"
"\n"
"\n"
"\n"
"\n"
"\n"
" A N D R O I D ";
write(fd, msg, strlen(msg));
close(fd);
}
}
return 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；
[cpp]
view plaincopyprint?
/* skip mounting filesystems in charger mode */
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);
}
/* skip mounting filesystems in charger mode */
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 plaincopyprint?
action_for_each_trigger("charger", action_add_queue_tail);
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 plaincopyprint?
int main(int argc, char **argv)
{
………………
klog_set_level(CHARGER_KLOG_LEVEL);
dump_last_kmsg();
LOGI("--------------- STARTING CHARGER MODE ---------------\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("Cannot load image\n");
charger->surf_unknown = NULL;
}
for (i = 0; i < charger->batt_anim->num_frames; i++) {//(4)、这里是显示charger logo，res_create_surface显示图片函数；
struct frame *frame = &charger->batt_anim->frames[i];
ret = res_create_surface(frame->name, &frame->surface);
if (ret < 0) {
LOGE("Cannot load image %s\n", frame->name);
/* TODO: free the already allocated surfaces... */
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；
return 0;
}
int main(int argc, char **argv)
{
………………
klog_set_level(CHARGER_KLOG_LEVEL);
dump_last_kmsg();
LOGI("--------------- STARTING CHARGER MODE ---------------\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("Cannot load image\n");
charger->surf_unknown = NULL;
}
for (i = 0; i < charger->batt_anim->num_frames; i++) {//(4)、这里是显示charger logo，res_create_surface显示图片函数；
struct frame *frame = &charger->batt_anim->frames[i];
ret = res_create_surface(frame->name, &frame->surface);
if (ret < 0) {
LOGE("Cannot load image %s\n", frame->name);
/* TODO: free the already allocated surfaces... */
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；
return 0;
}(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 plaincopyprint?
int gr_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) {
// This is non-fatal; post-Cupcake kernels don't have tty0.
perror("can't open /dev/tty0");
} else if (ioctl(gr_vt_fd, KDSETMODE, (void*) KD_GRAPHICS)) {
// However, if we do open tty0, we expect the ioctl to work.
perror("failed KDSETMODE to KD_GRAPHICS on tty0");
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 (%d x %d)\n",
gr_fb_fd, gr_framebuffer[0].width, gr_framebuffer[0].height);
/* start with 0 as front (displayed) and 1 as back (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);
return 0;
}
int gr_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) {
// This is non-fatal; post-Cupcake kernels don't have tty0.
perror("can't open /dev/tty0");
} else if (ioctl(gr_vt_fd, KDSETMODE, (void*) KD_GRAPHICS)) {
// However, if we do open tty0, we expect the ioctl to work.
perror("failed KDSETMODE to KD_GRAPHICS on tty0");
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 (%d x %d)\n",
gr_fb_fd, gr_framebuffer[0].width, gr_framebuffer[0].height);
/* start with 0 as front (displayed) and 1 as back (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);
return 0;
}(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 plaincopyprint?
int ev_init(ev_callback input_cb, void *data)
{
DIR *dir;
struct dirent *de;
int fd;
dir = opendir("/dev/input");//打开驱动结点；
if(dir != 0) {
while((de = readdir(dir))) {
unsigned long ev_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;
/* read the evbits of the input device */
if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) < 0) {
close(fd);
continue;
}
/* TODO: add ability to specify event masks. For now, just assume
* that only EV_KEY and EV_REL event types are ever needed. */
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;
}
}
return 0;
}
int ev_init(ev_callback input_cb, void *data)
{
DIR *dir;
struct dirent *de;
int fd;
dir = opendir("/dev/input");//打开驱动结点；
if(dir != 0) {
while((de = readdir(dir))) {
unsigned long ev_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;
/* read the evbits of the input device */
if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) < 0) {
close(fd);
continue;
}
/* TODO: add ability to specify event masks. For now, just assume
* that only EV_KEY and EV_REL event types are ever needed. */
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;
}
}
return 0;
}(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 plaincopyprint?
static void event_loop(struct charger *charger)
{
int ret;
while (true) {
int64_t now = 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；
/* do screen update last in case any of the above want to start
* screen transitions (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);
}
}
static void event_loop(struct charger *charger)
{
int ret;
while (true) {
int64_t now = 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；
/* do screen update last in case any of the above want to start
* screen transitions (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 plaincopyprint?
static void handle_input_state(struct charger *charger, int64_t now)
{
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);
static void process_key(struct charger *charger, int code, int64_t now)
{
………………
if (code == KEY_POWER) {
if (key->down) {
int64_t reboot_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;
}
static void handle_input_state(struct charger *charger, int64_t now)
{
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);
static void process_key(struct charger *charger, int code, int64_t now)
{
………………
if (code == KEY_POWER) {
if (key->down) {
int64_t reboot_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 plaincopyprint?
static void handle_power_supply_state(struct charger *charger, int64_t now)
{
if (charger->num_supplies_online == 0) {
if (charger->next_pwr_check == -1) {
charger->next_pwr_check = now + UNPLUGGED_SHUTDOWN_TIME;
LOGI("[%lld] device unplugged: shutting down in %lld (@ %lld)\n",
now, UNPLUGGED_SHUTDOWN_TIME, charger->next_pwr_check);
} else if (now >= charger->next_pwr_check) {
LOGI("[%lld] shutting down\n", now);
android_reboot(ANDROID_RB_POWEROFF, 0, 0);//如果DC拔出，则关机；
}
………………
}
static void handle_power_supply_state(struct charger *charger, int64_t now)
{
if (charger->num_supplies_online == 0) {
if (charger->next_pwr_check == -1) {
charger->next_pwr_check = now + UNPLUGGED_SHUTDOWN_TIME;
LOGI("[%lld] device unplugged: shutting down in %lld (@ %lld)\n",
now, UNPLUGGED_SHUTDOWN_TIME, charger->next_pwr_check);
} else if (now >= charger->next_pwr_check) {
LOGI("[%lld] shutting down\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 plaincopyprint?
static void update_screen_state(struct charger *charger, int64_t now)
{
struct animation *batt_anim = charger->batt_anim;
int cur_frame;
int disp_time;
if (!batt_anim->run || now < charger->next_screen_transition)
return;
/* animation is over, blank screen and leave */
if (batt_anim->cur_cycle == batt_anim->num_cycles) {
reset_animation(batt_anim);
charger->next_screen_transition = -1;
gr_fb_blank(true);
LOGV("[%lld] animation done\n", now);
return;
}
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time;
/* animation starting, set up the animation */
if (batt_anim->cur_frame == 0) {
int batt_cap;
int ret;
LOGV("[%lld] animation starting\n", now);
batt_cap = get_battery_capacity(charger);
if (batt_cap >= 0 && batt_anim->num_frames != 0) {
int i;
/* find first frame given current capacity */
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;
/* show the first frame for twice as long */
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time * 2;
}
batt_anim->capacity = batt_cap;
}
/* unblank the screen on first cycle */
if (batt_anim->cur_cycle == 0)
gr_fb_blank(false);
/* draw the new frame (@ cur_frame) */
redraw_screen(charger);
/* if we don't have anim frames, we only have one image, so just bump
* the cycle counter and exit
*/
if (batt_anim->num_frames == 0 || batt_anim->capacity < 0) {
LOGV("[%lld] animation missing or unknown battery status\n", now);
charger->next_screen_transition = now + BATTERY_UNKNOWN_TIME;
batt_anim->cur_cycle++;
return;
}
/* schedule next screen transition */
charger->next_screen_transition = now + disp_time;
/* advance frame cntr to the next valid frame
* if necessary, advance cycle cntr, and reset frame cntr
*/
batt_anim->cur_frame++;
/* if the frame is used for level-only, that is only show it when it's
* the current level, skip it during the animation.
*/
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't reset the cycle counter, since we use that as a signal
* in a test above to check if animation is over
*/
}
}
static void update_screen_state(struct charger *charger, int64_t now)
{
struct animation *batt_anim = charger->batt_anim;
int cur_frame;
int disp_time;
if (!batt_anim->run || now < charger->next_screen_transition)
return;
/* animation is over, blank screen and leave */
if (batt_anim->cur_cycle == batt_anim->num_cycles) {
reset_animation(batt_anim);
charger->next_screen_transition = -1;
gr_fb_blank(true);
LOGV("[%lld] animation done\n", now);
return;
}
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time;
/* animation starting, set up the animation */
if (batt_anim->cur_frame == 0) {
int batt_cap;
int ret;
LOGV("[%lld] animation starting\n", now);
batt_cap = get_battery_capacity(charger);
if (batt_cap >= 0 && batt_anim->num_frames != 0) {
int i;
/* find first frame given current capacity */
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;
/* show the first frame for twice as long */
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time * 2;
}
batt_anim->capacity = batt_cap;
}
/* unblank the screen on first cycle */
if (batt_anim->cur_cycle == 0)
gr_fb_blank(false);
/* draw the new frame (@ cur_frame) */
redraw_screen(charger);
/* if we don't have anim frames, we only have one image, so just bump
* the cycle counter and exit
*/
if (batt_anim->num_frames == 0 || batt_anim->capacity < 0) {
LOGV("[%lld] animation missing or unknown battery status\n", now);
charger->next_screen_transition = now + BATTERY_UNKNOWN_TIME;
batt_anim->cur_cycle++;
return;
}
/* schedule next screen transition */
charger->next_screen_transition = now + disp_time;
/* advance frame cntr to the next valid frame
* if necessary, advance cycle cntr, and reset frame cntr
*/
batt_anim->cur_frame++;
/* if the frame is used for level-only, that is only show it when it's
* the current level, skip it during the animation.
*/
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't reset the cycle counter, since we use that as a signal
* in a test above to check if animation is over
*/
}
}下面是不能容量时显示logo的函数：
[cpp]
view plaincopyprint?
static struct frame batt_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,
},
};
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- android 电池（二）：android关机充电流程、充电画面显示
- 【转】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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- android 电池（二）：android关机充电流程、充电画面显示