充电相关文件目录 alps\vendor\mediatek\proprietary\external\charger\
充电控制函数：charging_control.cpp
// total_time : ms
// interval : ms
static void draw_with_interval(void (*func)(int, int), int bc, int total_time_msec, int interval_msec)
{
struct timeval start;
int resume_started = 0, backlight_started = 0, cnt = 0;
int fd_fb = -1, err = 0;
char filename[32] = {0};
gettimeofday(&start, NULL);
while((!time_exceed(start, total_time_msec)) && (common_flag == false))
{
// check if need to draw animation before performing drawing
if (!is_charging_source_available())
return;
if (!resume_started) {
resume_started = 1;
request_suspend(false);
/* make fb unblank */
snprintf(filename, sizeof(filename), "/dev/graphics/fb0");
fd_fb = open(filename, O_RDWR);
if (fd_fb < 0) {
KPOC_LOGI("Failed to open fb0 device: %s", strerror(errno));
}
err = ioctl(fd_fb, FBIOBLANK, FB_BLANK_UNBLANK);
if (err < 0) {
KPOC_LOGI("Failed to unblank fb0 device: %s", strerror(errno));
}
if (fd_fb >= 0)
close(fd_fb);
}
func(bc, ++cnt);
if (!backlight_started) {
backlight_started = 1;
usleep(200*1000);
start_backlight();
}
KPOC_LOGI("draw_with_interval... key_trigger_suspend = %d\n",key_trigger_suspend);
usleep(interval_msec*1000);
}
}#define charging_source_waiting_duration_ms 3000
#define charging_source_waiting_interval_ms 200
static void* draw_thread_routine(void *arg)
{
int i, bc, bc_offset = 0;
int fd_fb = -1, err =0;
char buf[PROPERTY_VALUE_MAX];
char filename[32] = {0};
// protect the following critical section for the 1st time
pthread_mutex_lock(&mutex);
do {
KPOC_LOGI("draw thread working...\n");
// move here to avoid suspend when syncing with surfaceflinger
//在别处初始化为 １
if(firstTime){
// make sure charging source online when in KPOC mode
// add 2s tolerance
if(wait_until(is_charging_source_available,
charging_source_waiting_duration_ms,
charging_source_waiting_interval_ms))
{
KPOC_LOGI("wait until charging source available\n");
}else{
KPOC_LOGI("charging source not available for %d ms at KPOC starup\n",
charging_source_waiting_duration_ms);
}
firstTime = 0;
}
inDraw = 1;
// check the bc offest value
bc = get_capacity();
//这个函数内部有一段时间的循环控制，最主要是这个函数操作图标显示以及背光开与关
draw_with_interval(bootlogo_show_charging, bc, nChgAnimDuration_msec, nCbInterval_msec);
stop_backlight();
// @@@ draw fb again to refresh ddp
bootlogo_show_charging(bc, 1);
/* make fb blank */
snprintf(filename, sizeof(filename), "/dev/graphics/fb0");
fd_fb = open(filename, O_RDWR);
if (fd_fb < 0) {
KPOC_LOGI("Failed to open fb0 device: %s", strerror(errno));
}
err = ioctl(fd_fb, FBIOBLANK, FB_BLANK_POWERDOWN);
if (err < 0) {
KPOC_LOGI("Failed to blank fb0 device: %s", strerror(errno));
}
if (fd_fb >= 0)
close(fd_fb);
//循环一遍之后，进入睡眠
request_suspend(true);
inDraw = 0;
pthread_mutex_unlock(&mutex);
KPOC_LOGI("draw thread waiting...\n");
pthread_mutex_lock(&mutex);
pthread_cond_wait(&cond, &mutex);
} while(1);
pthread_exit(NULL);
return NULL;
}void charging_control()
{
firstTime = 1;
ret = pthread_create(&draw_thread, &attrd, draw_thread_routine, NULL);
}充电是会被编译成模块的，最终生成 system/vendor/bin/kpoc_charger
kernel-3.18\drivers\misc\mediatek\video\common\aal20\ddp_pwm.c
vendor\mediatek\proprietary\bootable\bootloader\lk\platform\mt6735\ddp_pwm.c
以上两个文件的函数都会被用到
注意：关机充电需要对背光的结点具有读写权限
device\mediatek\common\sepolicy\bsp\kpoc_charger.te中添加
allow kpoc_charger lcd_bl_file:file rw_file_perms;device\mediatek\common\sepolicy\bsp\file.te中添加
type lcd_bl_file, file_type,sysfs_type;device\mediatek\common\sepolicy\bsp\file_contexts中添加
/sys/devices/platform/leds-mt65xx/leds/lcd-backlight/brightness u:object_r:lcd_bl_file:s0device\mediatek\common\sepolicy\bsp\system_app.te中添加
allow system_app lcd_bl_file:file rw_file_perms; device\mediatek\common\sepolicy\bsp\system_server.te中添加
allow system_server lcd_bl_file:file rw_file_perms;