MSM8909+Android5.1.1之BSP开发---开关机充电三色灯控制

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MSM8909+Android5.1.1之BSP开发---开关机充电三色灯控制

图1

1.     充电三色灯控制

1.1   关机充电三色灯控制

相关文件：system\core\healthd\healthd_mode_charger.cpp

当前电量不等于之前电量时，调用handle_power_supply_state()--->set_battery_soc_leds()来控制三色灯，先来看其中用到的全局数组

#define RED_LED_PATH           "/sys/class/leds/red/brightness"
#define GREEN_LED_PATH         "/sys/class/leds/green/brightness"
#define BLUE_LED_PATH           "/sys/class/leds/blue/brightness"
 
struct led_ctl leds[3] =
   {{RED_LED, RED_LED_PATH},
   {GREEN_LED, GREEN_LED_PATH},
{BLUE_LED,BLUE_LED_PATH}};
 
struct soc_led_color_mapping soc_leds[3] ={
   {15, RED_LED},
   {90, RED_LED | GREEN_LED},
   {100, GREEN_LED},
};

高通的设计思路是：

红色：低电量，电量低于15%

蓝色：充电，电量在15%到90%之间

绿色：电量在90%到100%

比如对于/sys/class/leds/chg_red/brightness，设置为0为红色，1为绿色，255也是绿色

/green/brightness，设置为0为关闭绿色，设置为1为打开绿灯

static int set_battery_soc_leds(int soc)
{
   int i, color;
   static int old_color = 0;
 
   int fd;
   char buffer[10];
 
   fd = open("/sys/class/leds/chg_red/brightness", O_RDWR);
   snprintf(buffer, sizeof(int), "%d\n", 0);
   write(fd, buffer, strlen(buffer));
   close(fd);
 
   for (i = 0; i < (int)ARRAY_SIZE(soc_leds); i++) {
       if (soc <= soc_leds[i].soc)
           break;
    }
   color = soc_leds[i].color;
   if (old_color != color) {
       set_tricolor_led(0, old_color);
       set_tricolor_led(1, color);
       old_color = color;
       LOGV("soc = %d, set led color 0x%x\n", soc,soc_leds[i].color);
    }
   return 0;
}

这是高通默认的设计，但对于我们的硬件设计来说存在一个问题，就是电量>15%的时候，红色和绿色灯都是亮的，为了解决这个问题，且我们关机充电是在电量<95%是红灯，>=95%为绿灯，修改后如下：

struct led_ctl leds[2] =
   {{RED_LED, RED_LED_PATH},
   {GREEN_LED, GREEN_LED_PATH}};
 
struct soc_led_color_mapping soc_leds[2] ={
   {15, RED_LED},
   {95, GREEN_LED},
};
static int set_battery_soc_leds(int soc)
{
   int i, color;
   static int old_color = 0;
 
   int fd;
   char buffer[10];
 
   fd = open("/sys/class/leds/chg_red/brightness", O_RDWR);
   snprintf(buffer, sizeof(int), "%d\n", 0);//red on
   write(fd, buffer, strlen(buffer));
   close(fd);
 
   for (i = 0; i < (int)ARRAY_SIZE(soc_leds); i++) {
       if (soc <= soc_leds[i].soc)
           break;
    }
      
    if(old_color != color) {
 
              if(soc>=soc_leds[1].soc)
              {
                      fd =open("/sys/class/leds/chg_red/brightness", O_RDWR);
                        snprintf(buffer,sizeof(int), "%d\n", 255);//red off
                        write(fd,buffer, strlen(buffer));
                        close(fd);
                    
                     fd= open("/sys/class/leds/red/brightness", O_RDWR);  
                        snprintf(buffer,sizeof(int), "%d\n", 0);
                        write(fd,buffer, strlen(buffer));
                        close(fd);
                       
                     set_tricolor_led(1,GREEN_LED);
              }
              else
              {
                     set_tricolor_led(1,RED_LED);
              }
                    
               old_color = color;
               LOGV("soc = %d, set led color0x%x\n", soc, soc_leds[i].color);
      
          }
   return 0;
}

1.2   开机充电三色灯控制

frameworks/base/services/core/java/com/android/server/BatteryService.java
public void updateLightsLocked()
 
       /**
        * Synchronize on BatteryService.
        */
       public void updateLightsLocked() {
           final int level = mBatteryProps.batteryLevel;
           final int status = mBatteryProps.batteryStatus;
           if (level < mLowBatteryWarningLevel) {
               if (status ==BatteryManager.BATTERY_STATUS_CHARGING) {
                    // Solid red when batteryis charging
                   mBatteryLight.setColor(mBatteryLowARGB);
                } else {
                    // Flash red when batteryis low and not charging
                   mBatteryLight.setFlashing(mBatteryLowARGB, Light.LIGHT_FLASH_TIMED,
                           mBatteryLedOn,mBatteryLedOff);
                }
           } else if (status == BatteryManager.BATTERY_STATUS_CHARGING
                    || status ==BatteryManager.BATTERY_STATUS_FULL) {
                if (status ==BatteryManager.BATTERY_STATUS_FULL || level >=95) {//kandi change from 99 to95
                    // Solid green when full orcharging and nearly full
                   mBatteryLight.setColor(mBatteryFullARGB);
                } else {
                    // Solid orange whencharging and halfway full
                   mBatteryLight.setColor(mBatteryLowARGB);
                }
           } else {
                // No lights if not charging andnot low
                mBatteryLight.turnOff();
           }
       }

2.     放电三色灯控制

2.1   电量<15%

低电量红色闪烁也是采用上面的updateLightsLocked()来控制的。

MSM8909+Android5.1.1之BSP开发---开关机充电三色灯控制

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原文地址：http://blog.csdn.net/loongembedded/article/details/50727938