imx6 Android关机充电（charger mode）

浏览数：74 / 时间：2015年06月11日

//--------------------------------------------------------------------------------------------

// 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

<span style="font-family:Arial;">
</span>

<span style="font-family:Arial;">2.3：imx6跑到</span>

<span style="font-family:Arial;">2.3.1</span>

<span style="font-family:Arial;">[    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</span>

<span style="font-family:Arial;">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</span>

<span style="font-family:Arial;">。。。。。。。。。。。。。。。。。。。。。。。。</span>

<span style="font-family:Arial;">queue_builtin_action(console_init_action, "console_init");   //图片显示</span>

<span style="color:#ff0000;"><span style="font-family:Arial;">此处遇到一个纠结问题:如何在</span><span style="font-family: Arial;">init.c中打印log，有研究的大神烦指点下！</span></span>

<span style="font-family:Arial;"><span style="color:#ff0000;">ERROR("init_parse_config_file init.rc #####\n");这个函数貌似没及时打印到串口</span></span>

<span style="font-family:Arial;">2.3.2</span>

<span style="font-family:Arial;">分析init.c确定<span style="font-family: Arial; font-size: 18px; line-height: 26px;">androidboot.mode=charger参数有效，查看charger mode发现normal和charger主要区别在：</span></span>

<span style="font-family:Arial;"></span><pre name="code" class="cpp">    if (!is_charger) {
	//if (is_charger) {
		ERROR("!is_charger !is_charger #####\n");
<span style="color:#ff0000;">        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);</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！

<span style="font-family:Arial;">2.3.4</span>

<span style="font-family:Arial;">查看init.rc发现，一般init.rc中都有</span>

<span style="font-family:Arial;"></span><pre name="code" class="html"><span style="color:#ff0000;">on charger
    <span style="white-space:pre">	</span>class_start charger</span>

进而添加自己的服务

<span style="font-family:Arial;">service charger /charger
<span style="white-space:pre">		</span>user root
<span style="white-space:pre">		</span>group root graphics
<span style="white-space:pre">		</span>console</span>

<span style="font-family:Arial;"><span style="white-space:pre">		</span>oneshot
<span style="color:#ff0000;">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！</span></span>

<span style="font-family:Arial;">然而就是无法启动，停在：[    3.264596] Freeing init memory: 228K</span>

<span style="font-family:Arial;">此时有我想到两种方法：</span>

<span style="font-family:Arial;">一修改源码</span>

<span style="font-family:Arial;">二修改init.rc</span>

<span style="font-family:Arial;">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：</span>

<span style="font-family:Arial;"></span><pre name="code" class="cpp">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

<span style="color:#ff0000;">class_start default 加入</span>

<span style="font-family:Arial;"></span><pre name="code" class="html">on charger
<span style="white-space:pre">	</span>class_start default
   <span style="white-space:pre">	</span>class_start charger

这样就可以启动charger mode了！

<span style="font-family:Arial;">
</span>

<span style="font-family:Arial;">2.4</span>

<span style="font-family:Arial;">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>

<span style="font-family:Arial;"></span>

\\192.168.1.130\hcm\wk\myandroid\system\core\charger\charger.c

<span style="font-family:Arial;">\\192.168.1.130\hcm\wk\myandroid\system\core\charger\charger.c分析代码：</span>

<span style="font-family:Arial;">
</span><pre name="code" class="cpp">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];

        <span style="color:#ff0000;">ret = res_create_surface(frame->name, &frame->surface);                  //</span><span style="color: rgb(255, 0, 0); font-family: Arial;">res_create_surface将对应图片变为surface</span><span style="color:#ff0000;">
</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>
  。。。。。。。。。。。。。。。。。。。
}

3、修改Z:\wk\myandroid\device\fsl\imx6\imx6.mk

PRODUCT_PACKAGES += \

charger \
audio.primary.imx6 \
audio_policy.conf \
tinyplay