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.javapublic 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。