Android 8.1 關機充電動畫（一）模式選擇

system：Android 8.1

platform：RK3326/PX30

uboot

kernel

Android 8.1 關機充電動畫（一）模式選擇

Android 8.1 關機充電動畫（二）Uboot模式

Android 8.1 關機充電動畫（三）Android模式

文章目錄

前言

配置

代碼分析

總結

附錄

前言

關機充電的動畫可以在u-boot或者Android的charger模式工作，這是兩個相互獨立的部分，RK平臺上需要在設備樹進行配置。顧名思義u-boot下的charger模式，系統仍然運行在loader下，并未啟動內核。

Android的charger模式下，在引導程序運行期間會傳遞參數給內核，則會啟動內核并加載內核模塊，同時安卓系統也不會啟動，系統最終只工作charger模式。這里簡單記錄一下，在uboot中都做了哪些工作，根據什么條件選擇工作的模式。

配置

設備樹要增加節點charge-animation，這個rk的文檔里有相應的說明，在配置下面設備樹的配置中，我已經加上了注釋，對照這個看就行，不過所有屬性只適用u-boot下的關機充電，而不適用用Android下的關機充電，這個具體會在后面加以說明。

這里暫時把已經啟動內核之后再進入charger的模式稱作Android下的關機充電，可能有些不妥，但是先這樣區分吧

具體的配置如下；

rockchip,uboot-charge-on = <0>; ,rockchip,android-charge-on = <1>; 這兩個屬性用于選擇后續的程序會進入到哪一種模式工作，后面在代碼中會加以區分。

charge-animation { compatible = "rockchip,uboot-charge"; rockchip,uboot-charge-on = <0>; // 是否在U-Boot進行充電 rockchip,android-charge-on = <1>; // 是否在Android進行充電 rockchip,uboot-exit-charge-level = <5>; // U-Boot充電時，允許開機的最低電量 rockchip,uboot-exit-charge-voltage = <3600>; // U-Boot充電時，允許開機的最低電壓 rockchip,screen-on-voltage = <3400>; // U-Boot充電時，允許點亮屏幕的最低電壓 rockchip,uboot-low-power-voltage = <3350>; // U-Boot無條件強制進入充電模式的最低電壓 rockchip,system-suspend = <0>; // 滅屏時進入trust進行低功耗待機 rockchip,auto-off-screen-interval = <10>;// 亮屏超時后自動滅屏，單位秒。(如果沒有這個屬性，則默認15s) rockchip,auto-wakeup-interval = <0>; // 休眠自動喚醒時間，單位秒。(如果值為0或沒有這個屬性，則禁止休眠自動喚醒) rockchip,auto-wakeup-screen-invert = <0>; // 休眠自動喚醒的時候，是否讓屏幕產生亮/滅效果 status = "okay"; };

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代碼分析

可以定位到u-boot/drivers/power/charge_animation.c，目前只分析一下函數static int charge_animation_show(struct udevice *dev)，具體代碼見最后的附錄

這個函數會在啟動內核之前進行一個簡單的檢測；

1. Extrem low power charge? 2. Preboot cmd? 3. Valid boot mode? 4. U-Boot charge enabled by dts config? 5. Screen off before charge? 6. Enter charge !

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分別是1 檢測低電量，2 檢測啟動命令，3 檢測啟動模式，4 檢測設備樹配置，這四項檢測如果不符合會直接return，然后無法成功進入6 Enter charge的狀態。具體的可以在代碼里面慢慢看，至于第五點，不太清楚了。這里先把第四點的部分相關的代碼摳出來，如下：

/* charge mode */ pdata->uboot_charge = dev_read_u32_default(dev, "rockchip,uboot-charge-on", 0); pdata->android_charge = dev_read_u32_default(dev, "rockchip,android-charge-on", 0); /* Enter android charge, set property for kernel */ if (pdata->android_charge) { env_update("bootargs", "androidboot.mode=charger"); } /* Not enable U-Boot charge, exit */ if (!pdata->uboot_charge) { debug("exit charge, due to not enable uboot charge\n"); return 0; }

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可以看到這里有兩種情況

uboot_charge如果在設備樹里配置為開啟，則無法進入Android 關機充電模式了，然后最終程序會進入到while(1)不斷循環顯示充電動畫，檢測到相應事件動作之后才會退出充電進入系統，或者掉電關機;

android_charge在設備樹中設置開啟，并且 uboot_charge設置為關閉的情況下，會設置內核的啟動參數env_update("bootargs", "androidboot.mode=charger")，之后uboot會啟動內核，并傳參數給內核，告訴他，要進入Android關機充電的模式。

總結

這里篇幅較短，主要分析了在u-boot下charge_animation_show的部分工作流程即如何選擇最終充電的模式，下面會簡單介紹uboot下關機充電和Android下關機充電的動畫定制。

附錄

代碼可能已經更新請參考u-boot/drivers/power/charge_animation.c

static int charge_animation_show(struct udevice *dev) { struct charge_animation_pdata *pdata = dev_get_platdata(dev); struct charge_animation_priv *priv = dev_get_priv(dev); const struct charge_image *image = priv->image; struct udevice *pmic = priv->pmic; struct udevice *fg = priv->fg; const char *preboot = env_get("preboot"); int image_num = priv->image_num; bool ever_lowpower_screen_off = false; bool screen_on = true; ulong show_start = 0, charge_start = 0, debug_start = 0; ulong delta; ulong ms = 0, sec = 0; int start_idx = 0, show_idx = -1, old_show_idx = IMAGE_SHOW_RESET; int soc, voltage, current, key_state; int i, charging = 1, ret; int boot_mode; int first_poll_fg = 1; /* * Check sequence: * * 1. Extrem low power charge? * 2. Preboot cmd? * 3. Valid boot mode? * 4. U-Boot charge enabled by dts config? * 5. Screen off before charge? * 6. Enter charge ! * */ if (!fuel_gauge_bat_is_exist(fg)) { printf("Exit charge: battery is not exist\n"); return 0; } /* Extrem low power charge */ ret = charge_extrem_low_power(dev); if (ret < 0) { printf("extrem low power charge failed, ret=%d\n", ret); return ret; } /* If there is preboot command, exit */ if (preboot && !strstr(preboot, "dvfs")) { printf("Exit charge: due to preboot cmd '%s'\n", preboot); return 0; } /* Not valid charge mode, exit */ #ifdef CONFIG_RKIMG_BOOTLOADER boot_mode = rockchip_get_boot_mode(); if ((boot_mode != BOOT_MODE_CHARGING) && (boot_mode != BOOT_MODE_UNDEFINE)) { printf("Exit charge: due to boot mode\n"); return 0; } #endif /* Not charger online, exit */ charging = fuel_gauge_get_chrg_online(fg); if (charging <= 0) { printf("Exit charge: due to charger offline\n"); return 0; } /* Enter android charge, set property for kernel */ if (pdata->android_charge) { env_update("bootargs", "androidboot.mode=charger"); printf("Android charge mode\n"); } /* Not enable U-Boot charge, exit */ if (!pdata->uboot_charge) { printf("Exit charge: due to not enable uboot charge\n"); return 0; } voltage = fuel_gauge_get_voltage(fg); if (voltage < 0) { printf("get voltage failed: %d\n", voltage); return -EINVAL; } /* If low power, turn off screen */ if (voltage <= pdata->screen_on_voltage + 50) { screen_on = false; ever_lowpower_screen_off = true; charge_show_bmp(NULL); } /* Auto wakeup */ if (pdata->auto_wakeup_interval) { printf("Auto wakeup: %dS\n", pdata->auto_wakeup_interval); autowakeup_timer_init(dev, pdata->auto_wakeup_interval); } /* Give a message warning when CONFIG_IRQ is not enabled */ #ifdef CONFIG_IRQ printf("Enter U-Boot charging mode\n"); #else printf("Enter U-Boot charging mode(without IRQ)\n"); #endif charge_start = get_timer(0); delta = get_timer(0); /* Charging ! */ while (1) { /* * At the most time, fuel gauge is usually a i2c device, we * should avoid read/write all the time. We had better set * poll seconds to update fuel gauge info. */ if (!first_poll_fg && get_timer(delta) < FUEL_GAUGE_POLL_MS) goto show_images; delta = get_timer(0); debug("step1 (%d)... \n", screen_on); /* * Most fuel gauge is I2C interface, it shouldn't be interrupted * during tansfer. The power key event depends on interrupt, so * so we should disable local irq when update fuel gauge. */ local_irq_disable(); /* Step1: Is charging now ? */ charging = fuel_gauge_get_chrg_online(fg); if (charging <= 0) { printf("Not charging, online=%d. Shutdown...\n", charging); /* wait uart flush before shutdown */ mdelay(5); /* PMIC shutdown */ pmic_shutdown(pmic); printf("Cpu should never reach here, shutdown failed !\n"); continue; } debug("step2 (%d)... show_idx=%d\n", screen_on, show_idx); /* Step2: get soc and voltage */ soc = fuel_gauge_get_soc(fg); if (soc < 0 || soc > 100) { printf("get soc failed: %d\n", soc); continue; } voltage = fuel_gauge_get_voltage(fg); if (voltage < 0) { printf("get voltage failed: %d\n", voltage); continue; } current = fuel_gauge_get_current(fg); if (current == -ENOSYS) { printf("get current failed: %d\n", current); continue; } first_poll_fg = 0; local_irq_enable(); show_images: /* * Just for debug, otherwise there will be nothing output which * is not good to know what happen. */ if (!debug_start) debug_start = get_timer(0); if (get_timer(debug_start) > 20000) { debug_start = get_timer(0); printf("[%8ld]: soc=%d%%, vol=%dmv, c=%dma, online=%d, screen_on=%d\n", get_timer(0)/1000, soc, voltage, current, charging, screen_on); } /* * If ever lowpower screen off, force screen_on=false, which * means key event can't modify screen_on, only voltage higher * then threshold can update screen_on=true; */ if (ever_lowpower_screen_off) screen_on = false; /* * Auto turn on screen when voltage higher than Vol screen on. * 'ever_lowpower_screen_off' means enter while loop with * screen off. */ if ((ever_lowpower_screen_off) && (voltage > pdata->screen_on_voltage)) { ever_lowpower_screen_off = false; screen_on = true; show_idx = IMAGE_SHOW_RESET; } /* * IMAGE_SHOW_RESET means show_idx show be update by start_idx. * When short key pressed event trigged, we will set show_idx * as IMAGE_SHOW_RESET which updates images index from start_idx * that calculate by current soc. */ if (show_idx == IMAGE_SHOW_RESET) { for (i = 0; i < image_num - 2; i++) { /* Find out which image we start to show */ if ((soc >= image[i].soc) && (soc < image[i + 1].soc)) { start_idx = i; break; } if (soc >= 100) { start_idx = image_num - 2; break; } } debug("%s: show_idx=%d, screen_on=%d\n", __func__, show_idx, screen_on); /* Mark start index and start time */ show_idx = start_idx; show_start = get_timer(0); } debug("step3 (%d)... show_idx=%d\n", screen_on, show_idx); /* Step3: show images */ if (screen_on) { /* Don't call 'charge_show_bmp' unless image changed */ if (old_show_idx != show_idx) { old_show_idx = show_idx; debug("SHOW: %s\n", image[show_idx].name); charge_show_bmp(image[show_idx].name); } /* Re calculate timeout to off screen */ if (priv->auto_screen_off_timeout == 0) priv->auto_screen_off_timeout = get_timer(0); } else { priv->auto_screen_off_timeout = 0; system_suspend_enter(pdata); } mdelay(5); /* Every image shows period */ if (get_timer(show_start) > image[show_idx].period) { show_start = get_timer(0); /* Update to next image */ show_idx++; if (show_idx > (image_num - 2)) show_idx = IMAGE_SHOW_RESET; } debug("step4 (%d)... \n", screen_on); /* * Step4: check key event. * * Short key event: turn on/off screen; * Long key event: show logo and boot system or still charging. */ key_state = check_key_press(dev); if (key_state == KEY_PRESS_DOWN) { old_show_idx = IMAGE_SHOW_RESET; /* NULL means show nothing, ie. turn off screen */ if (screen_on) charge_show_bmp(NULL); /* * Clear current image index, and show image * from start_idx */ show_idx = IMAGE_SHOW_RESET; /* * We turn off screen by charge_show_bmp(NULL), so we * should tell while loop to stop show images any more. * * If screen_on=false, means this short key pressed * event turn on the screen and we need show images. * * If screen_on=true, means this short key pressed * event turn off the screen and we never show images. */ if (screen_on) screen_on = false; else screen_on = true; } else if (key_state == KEY_PRESS_LONG_DOWN) { /* Only long pressed while screen off needs screen_on true */ if (!screen_on) screen_on = true; /* Is able to boot now ? */ if (soc < pdata->exit_charge_level) { printf("soc=%d%%, threshold soc=%d%%\n", soc, pdata->exit_charge_level); printf("Low power, unable to boot, charging...\n"); show_idx = image_num - 1; continue; } if (voltage < pdata->exit_charge_voltage) { printf("voltage=%dmv, threshold voltage=%dmv\n", voltage, pdata->exit_charge_voltage); printf("Low power, unable to boot, charging...\n"); show_idx = image_num - 1; continue; } /* Success exit charging */ printf("Exit charge animation...\n"); charge_show_logo(); break; } else { /* Do nothing */ } debug("step5 (%d)... \n", screen_on); /* Step5: Exit by ctrl+c */ if (ctrlc()) { if (voltage >= pdata->screen_on_voltage) charge_show_logo(); printf("Exit charge, due to ctrl+c\n"); break; } } if (pdata->auto_wakeup_interval) autowakeup_timer_uninit(); ms = get_timer(charge_start); if (ms >= 1000) { sec = ms / 1000; ms = ms % 1000; } printf("charging time total: %lu.%lus, soc=%d%%, vol=%dmv\n", sec, ms, soc, voltage); return 0; }

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Android

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