imx6 Android关机充电（charger mode）
//--------------------------------------------------------------------------------------------
// 作者：longtian635241
// 论坛ID：imx6
// 版权：longtian635241
// 平台：飞思卡尔imx6
// 发布日期：2014-11-26
// 最后修改：2014-11-26
//----------------------------------------------------------------------------------------------
1、imx6如何进入charger模式呢？为尊重前辈先上参考资料！
http://blog.csdn.net/xubin341719/article/details/8498580 :讲解详细，基本都讲到了
http://blog.csdn.net/k_linux_man/article/details/7292746 ：文中错误明显有提示作用，补充上面的
http://blog.sina.com.cn/s/blog_d627f7dc010199xt.html ：当bootargs设置为androidboot.mode=charger不能启动charger可以参考修改源码
http://blog.csdn.net/shuaiff/article/details/5581127 同上
http://blog.csdn.net/lushengchu_luis/article/details/20382775
http://blog.csdn.net/wh_19910525/article/details/23176065 charger.c分析
2、具体过程
2.1 测试方法：
在uboot模式下设置bootargs：
<pre name="code" class="cpp">Hit any key to stop autoboot: 0 MX6Q SABRESD U-Boot > set bootargs console=ttymxc0,115200 init=/init video=mxcfb0:dev=lcd,SEIKO-WVGA,if=RGB24 video=mxcfb1:off video=mxcfb2:off vmalloc=400M androidboot.console=ttymxc0 androidboot.hardware=freescale androidboot.mode=charger MX6Q SABRESD U-Boot > sav Saving Environment to MMC... Writing to MMC(3)... done MX6Q SABRESD U-Boot >
2.2 重启，这是如果你幸运应该会进入charger mode
2.3：imx6跑到<
2.3.1
[ 3.255968] snvs_rtc snvs_rtc.0: setting system clock to 1970-01-02 01:57:30 UTC (93450) [ 3.264596] Freeing init memory: 228K 就没有反应了，
通过测试发现已经加载到Z:\wk\myandroid\system\core\init\init.c的
。。。。。。。。。。。。。。。。。。。。。。。。
queue_builtin_action(console_init_action, "console_init"); //图片显示
<span style="font-family: Arial;">ERROR("init_parse_config_file init.rc #####\n");这个函数貌似没及时打印到串口</span>
<span style="font-family: Arial;">2.3.2<</span>
<span style="font-family: Arial;">分析init.c确定 androidboot.mode=charger参数有效，查看charger mode发现normal和charger主要区别在：</span>
<span style="font-family: Arial;"> if (!is_charger) {</span>
ERROR("!is_charger !is_charger #####\n");
<span style="font-family: Arial;"> action_for_each_trigger("early-fs", action_add_queue_tail);</span>
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);</span>
}
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 (is_charger) {
//if (!is_charger) {
ERROR("is_charger is_charger $$$$$$$$$$$$$\n");
action_for_each_trigger("charger", action_add_queue_tail);
} else {
ERROR("action_for_each_trigger early-boot$$$$$$$$$$$$$\n");
<span style="color:#ff0000;"> action_for_each_trigger("early-boot", action_add_queue_tail);
action_for_each_trigger("boot", action_add_queue_tail);</span>
}
然后这些的执行都在init.rc中触发执行，而charger没有执行这些就无法执行，确定应该是init.rc的某些服务没配置！
2.3.4
查看init.rc发现，一般init.rc中都有
on charger
<span style="font-family: Arial;">class_start charger</span>
进而添加自己的服务 service charger /charger user root group root graphics console
oneshot init.rc语法很重要：其中不能加class main，class core，因为这两个启动的时候就会让这一类都启动！
然而就是无法启动，停在：[ 3.264596] Freeing init memory: 228K
此时有我想到两种方法：
一修改源码
二修改init.rc
自己太懒不想改源码，那样破坏其原始性，于是改init.rc，由于不熟悉init.rc的语法，瞎折腾了一天！因为我确信init.rc有问题，最后我参考了recovery模式下的init.rc：
import /init.recovery.${ro.hardware}.rc
on early-init
start ueventd
on init
export PATH /sbin
export ANDROID_ROOT /system
export ANDROID_DATA /data
export EXTERNAL_STORAGE /sdcard
symlink /system/etc /etc
mkdir /sdcard
mkdir /system
mkdir /data
mkdir /cache
mount /tmp /tmp tmpfs
chown root shell /tmp
chmod 0775 /tmp
write /sys/class/android_usb/android0/enable 0
write /sys/class/android_usb/android0/idVendor 18D1
write /sys/class/android_usb/android0/idProduct D001
write /sys/class/android_usb/android0/functions adb
write /sys/class/android_usb/android0/iManufacturer ${ro.product.manufacturer}
write /sys/class/android_usb/android0/iProduct ${ro.product.model}
write /sys/class/android_usb/android0/iSerial ${ro.serialno}
on boot
ifup lo
hostname localhost
domainname localdomain
<span style="color:#ff0000;"> class_start default //recovery模式下的重点</span>
service ueventd /sbin/ueventd
critical
service recovery /sbin/recovery
service adbd /sbin/adbd recovery
disabled
# Always start adbd on userdebug and eng builds
on property:ro.debuggable=1
write /sys/class/android_usb/android0/enable 1
start adbd
# Restart adbd so it can run as root
on property:service.adb.root=1
write /sys/class/android_usb/android0/enable 0
restart adbd
write /sys/class/android_usb/android0/enable 1
最后将
class_start default 加入
<span style="font-family: Arial, Helvetica, sans-serif; font-size: 12px;">on charger</span>
class_start default class_start charger这样就可以启动charger mode了！
<span style="font-family: Arial, Helvetica, sans-serif;">2.4</span>
自带的图片太丑，想换几张图片，因为原来libminui只支持png图片，找了几张替换，发现显示有问题：
<span style="font-family:Arial;">\\192.168.1.130\hcm\wk\myandroid\system\core\charger\charger.c分析代码：
int main(int argc, char **argv)
{
int ret;
struct charger *charger = &charger_state;
int64_t now = curr_time_ms() - 1;
int fd;
int i;
list_init(&charger->supplies);
klog_init();
klog_set_level(CHARGER_KLOG_LEVEL);
dump_last_kmsg();
LOGI("--------------- STARTING CHARGER MODE ---------------\n");
gr_init();
gr_font_size(&char_width, &char_height);
ev_init(input_callback, charger);
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");
<span style="color:#ff0000;"> ret = res_create_surface("charger/battery_fail", &charger->surf_unknown);</span>
if (ret < 0) {
LOGE("Cannot load image\n");
charger->surf_unknown = NULL;
}
for (i = 0; i < charger->batt_anim->num_frames; i++) {
struct frame *frame = &charger->batt_anim->frames[i];
ret = res_create_surface(frame->name, &frame->surface); //<span style="font-family: Arial, Helvetica, sans-serif;">res_create_surface将对应图片变为surface</span>
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);
#ifndef CHARGER_DISABLE_INIT_BLANK
gr_fb_blank(true);
#endif
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);
LOGI("start event_loop\n");
event_loop(charger);
return 0;
}
具体显示流程：event_loop ---->update_screen_state------>redraw_screen----->draw_unknown(draw_battery)
------->draw_surface_centered--------->gr_blit
libminui库在：Y:\git-InnoTab\bootable\recovery\minui
分析此文件时，可以参考recovery的ui显示分析！
http://www.2cto.com/kf/201301/183366.html
http://blog.csdn.net/thinkinwm/article/details/12621129
im6的显示修改：
Y:\git-InnoTab\bootable\recovery\minui\resources.c的
int res_create_surface(const char* name, gr_surface* pSurface) {
。。。。。。。。。。。。。。。。
snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.png", name);
resPath[sizeof(resPath)-1] = '\0';
FILE* fp = fopen(resPath, "rb");
if (fp == NULL) {
result = -1;
goto exit;
}
。。。。。。。。。。。。。。。。。。。。。。。。
。。。。。。。。。。。。。。。。。。
if (setjmp(png_jmpbuf(png_ptr))) {
result = -6;
goto exit;
}
png_init_io(png_ptr, fp);
png_set_sig_bytes(png_ptr, sizeof(header));
png_read_info(png_ptr, info_ptr);
size_t width = info_ptr->width;
size_t height = info_ptr->height;
size_t stride = 4 * width;
size_t pixelSize = stride * height;
。。。。。。。。。。。。。。。。。。。。。
unsigned char* pData = (unsigned char*) (surface + 1);
surface->version = sizeof(GGLSurface);
surface->width = width;
surface->height = height;
surface->stride = width; /* Yes, pixels, not bytes */
surface->data = pData;
<span style="color:#ff0000;">// surface->format = (channels == 3) ? GGL_PIXEL_FORMAT_RGBX_8888 :
// ((color_type == PNG_COLOR_TYPE_PALETTE ? GGL_PIXEL_FORMAT_RGBA_8888 : GGL_PIXEL_FORMAT_L_8));改为如下
surface->format = (channels == 3)?GGL_PIXEL_FORMAT_RGBX_8888 : GGL_PIXEL_FORMAT_RGBA_8888;</span>
。。。。。。。。。。。。。。。。。。。
}
PRODUCT_PACKAGES += \
charger \
audio.primary.imx6\
audio_policy.conf\
tinyplay
编译一下，make bootimage之后，烧机。