背光屏幕亮度

DisplayPowerController.java

    private void updatePowerState() {
        // Update the power state request.

              Slog.d(TAG, "updatePowerState:brightness=: " + brightness);
        // Animate the screen brightness when the screen is on or dozing.
        // Skip the animation when the screen is off or suspended or transition to/from VR.
        if (!mPendingScreenOff) {
            boolean wasOrWillBeInVr = (state == Display.STATE_VR || oldState == Display.STATE_VR);
            if ((state == Display.STATE_ON || state == Display.STATE_DOZE) && !wasOrWillBeInVr) {
                animateScreenBrightness(brightness,
                        slowChange ? mBrightnessRampRateSlow : mBrightnessRampRateFast);
            } else {
                animateScreenBrightness(brightness, 0);
            }
        }

DisplayPowerState.java

    /**
     * Sets the display brightness.
     *
     * @param brightness The brightness, ranges from 0 (minimum / off) to 255 (brightest).
     */
    public void setScreenBrightness(int brightness) {
        if (mScreenBrightness != brightness) {
            if (DEBUG) {
                Slog.d(TAG, "setScreenBrightness: brightness=" + brightness);
            }

            mScreenBrightness = brightness;
            if (mScreenState != Display.STATE_OFF) {
                mScreenReady = false;
                scheduleScreenUpdate();
            }
        }
    }

LightsService.java

public abstract class LightsManager {
    public static final int LIGHT_ID_BACKLIGHT = 0;
    public static final int LIGHT_ID_KEYBOARD = 1;
    public static final int LIGHT_ID_BUTTONS = 2;
    public static final int LIGHT_ID_BATTERY = 3;
    public static final int LIGHT_ID_NOTIFICATIONS = 4;
    public static final int LIGHT_ID_ATTENTION = 5;
    public static final int LIGHT_ID_BLUETOOTH = 6;
    public static final int LIGHT_ID_WIFI = 7;
    public static final int LIGHT_ID_COUNT = 8;

    public abstract Light getLight(int id);
}

 


       @Override
        public void setBrightness(int brightness, int brightnessMode) {
            synchronized (this) {
                // LOW_PERSISTENCE cannot be manually set
                if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {
                    Slog.w(TAG, "setBrightness with LOW_PERSISTENCE unexpected #" + mId +
                            ": brightness=0x" + Integer.toHexString(brightness));
                    return;
                }

                int color = brightness & 0x000000ff;
                color = 0xff000000 | (color << 16) | (color << 8) | color;
				Slog.d(TAG, "LightsService brightnessMode=" + brightnessMode +
                            " ,: brightness=0x" + Integer.toHexString(brightness)+" ,color=:"+color);
                setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, brightnessMode);
            }
        }

        setLight_native(mNativePointer, mId, color, mode, onMS, offMS, brightnessMode);

com_android_server_lights_LightsService.cpp


static jlong init_native(JNIEnv* /* env */, jobject /* clazz */)
{
    int err;
    hw_module_t* module;
    Devices* devices;
    
    devices = (Devices*)malloc(sizeof(Devices));

    err = hw_get_module(LIGHTS_HARDWARE_MODULE_ID, (hw_module_t const**)&module);
    if (err == 0) {
        devices->lights[LIGHT_INDEX_BACKLIGHT]
                = get_device(module, LIGHT_ID_BACKLIGHT);
        devices->lights[LIGHT_INDEX_KEYBOARD]
                = get_device(module, LIGHT_ID_KEYBOARD);
        devices->lights[LIGHT_INDEX_BUTTONS]
                = get_device(module, LIGHT_ID_BUTTONS);
        devices->lights[LIGHT_INDEX_BATTERY]
                = get_device(module, LIGHT_ID_BATTERY);
        devices->lights[LIGHT_INDEX_NOTIFICATIONS]
                = get_device(module, LIGHT_ID_NOTIFICATIONS);
        devices->lights[LIGHT_INDEX_ATTENTION]
                = get_device(module, LIGHT_ID_ATTENTION);
        devices->lights[LIGHT_INDEX_BLUETOOTH]
                = get_device(module, LIGHT_ID_BLUETOOTH);
        devices->lights[LIGHT_INDEX_WIFI]
                = get_device(module, LIGHT_ID_WIFI);
    } else {
        memset(devices, 0, sizeof(Devices));
    }

    return (jlong)devices;
}


static void setLight_native(JNIEnv* /* env */, jobject /* clazz */, jlong ptr,
        jint light, jint colorARGB, jint flashMode, jint onMS, jint offMS, jint brightnessMode)
{
    state.color = colorARGB;
    state.brightnessMode = brightnessMode;

    {
        ALOGD_IF_SLOW(50, "Excessive delay setting light");
        devices->lights[light]->set_light(devices->lights[light], &state);
    }
}
[LIGHT_INDEX_BACKLIGHT]
                = get_device(module, LIGHT_ID_BACKLIGHT);
        devices->lights[LIGHT_INDEX_KEYBOARD]
                = get_device(module, LIGHT_ID_KEYBOARD);
        devices->lights[LIGHT_INDEX_BUTTONS]
                = get_device(module, LIGHT_ID_BUTTONS);
        devices->lights[LIGHT_INDEX_BATTERY]
                = get_device(module, LIGHT_ID_BATTERY);
        devices->lights[LIGHT_INDEX_NOTIFICATIONS]
                = get_device(module, LIGHT_ID_NOTIFICATIONS);
        devices->lights[LIGHT_INDEX_ATTENTION]
                = get_device(module, LIGHT_ID_ATTENTION);
        devices->lights[LIGHT_INDEX_BLUETOOTH]
                = get_device(module, LIGHT_ID_BLUETOOTH);
        devices->lights[LIGHT_INDEX_WIFI]
                = get_device(module, LIGHT_ID_WIFI);
    } else {
        memset(devices, 0, sizeof(Devices));
    }

    return (jlong)devices;
}


static void setLight_native(JNIEnv* /* env */, jobject /* clazz */, jlong ptr,
        jint light, jint colorARGB, jint flashMode, jint onMS, jint offMS, jint brightnessMode)
{
    state.color = colorARGB;
    state.brightnessMode = brightnessMode;

    {
        ALOGD_IF_SLOW(50, "Excessive delay setting light");
        devices->lights[light]->set_light(devices->lights[light], &state);
    }
}

lights.h

/*
 * These light IDs correspond to logical lights, not physical.
 * So for example, if your INDICATOR light is in line with your
 * BUTTONS, it might make sense to also light the INDICATOR
 * light to a reasonable color when the BUTTONS are lit.
 */
#define LIGHT_ID_BACKLIGHT          "backlight"
#define LIGHT_ID_KEYBOARD           "keyboard"
#define LIGHT_ID_BUTTONS            "buttons"
#define LIGHT_ID_BATTERY            "battery"
#define LIGHT_ID_NOTIFICATIONS      "notifications"
#define LIGHT_ID_ATTENTION          "attention"

lights.c

char const*const RED_LED_FILE
        = "/sys/class/leds/red/brightness";

char const*const GREEN_LED_FILE
        = "/sys/class/leds/green/brightness";

char const*const BLUE_LED_FILE
        = "/sys/class/leds/blue/brightness";

char const*const BLUETOOTH_LED_FILE
        = "/sys/class/leds/bt/brightness";

char const*const LCD_FILE
        = "/sys/class/leds/lcd-backlight/brightness";

char const*const BUTTON_FILE
        = "/sys/class/leds/button-backlight/brightness";

char const*const RED_BLINK_FILE
        = "/sys/class/leds/red/blink";

char const*const GREEN_BLINK_FILE
        = "/sys/class/leds/green/blink";

char const*const BLUE_BLINK_FILE
        = "/sys/class/leds/blue/blink";





static int
set_light_backlight(struct light_device_t* dev,
        struct light_state_t const* state)
{
    int err = 0;
    int brightness = rgb_to_brightness(state);
    if(!dev) {
        return -1;
    }
    pthread_mutex_lock(&g_lock);
    err = write_int(LCD_FILE, brightness);
    pthread_mutex_unlock(&g_lock);
    return err;
}

kernel

android\kernel\drivers\video\msm

mdss_fb.c

static struct led_classdev backlight_led = {
	.name           = "lcd-backlight",
	.brightness     = MDSS_MAX_BL_BRIGHTNESS / 2,
	.brightness_set = mdss_fb_set_bl_brightness,
	.max_brightness = MDSS_MAX_BL_BRIGHTNESS,
};mdss_fb_set_bl_brightness,
	.max_brightness = MDSS_MAX_BL_BRIGHTNESS,
};

mdss_dsi_panel.c

int mdss_dsi_panel_init(struct device_node *node,
	struct mdss_dsi_ctrl_pdata *ctrl_pdata,
	bool cmd_cfg_cont_splash)
{
	int rc = 0;
	static const char *panel_name;
	struct mdss_panel_info *pinfo;

	if (!node || !ctrl_pdata) {
		pr_err("%s: Invalid arguments\n", __func__);
		return -ENODEV;
	}

	pinfo = &ctrl_pdata->panel_data.panel_info;

	pr_debug("%s:%d\n", __func__, __LINE__);
	pinfo->panel_name[0] = '\0';
	panel_name = of_get_property(node, "qcom,mdss-dsi-panel-name", NULL);
	if (!panel_name) {
		pr_info("%s:%d, Panel name not specified\n",
						__func__, __LINE__);
	} else {
		pr_info("%s: Panel Name = %s\n", __func__, panel_name);
		strlcpy(&pinfo->panel_name[0], panel_name, MDSS_MAX_PANEL_LEN);
	}
	rc = mdss_panel_parse_dt(node, ctrl_pdata);
	if (rc) {
		pr_err("%s:%d panel dt parse failed\n", __func__, __LINE__);
		return rc;
	}

	mdss_dsi_set_lane_clamp_mask(&pinfo->mipi);
	if (!cmd_cfg_cont_splash)
		pinfo->cont_splash_enabled = false;
	pr_info("%s: Continuous splash %s\n", __func__,
		pinfo->cont_splash_enabled ? "enabled" : "disabled");

	pinfo->dynamic_switch_pending = false;
	pinfo->is_lpm_mode = false;
	pinfo->esd_rdy = false;

	ctrl_pdata->on = mdss_dsi_panel_on;
	ctrl_pdata->post_panel_on = mdss_dsi_post_panel_on;
	ctrl_pdata->off = mdss_dsi_panel_off;
	ctrl_pdata->low_power_config = mdss_dsi_panel_low_power_config;
	ctrl_pdata->panel_data.set_backlight = mdss_dsi_panel_bl_ctrl;
	ctrl_pdata->switch_mode = mdss_dsi_panel_switch_mode;

	return 0;
}set_backlight = mdss_dsi_panel_bl_ctrl;
	ctrl_pdata->switch_mode = mdss_dsi_panel_switch_mode;

	return 0;
}

背光 屏幕亮度

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