static int acx565akm_bl_get_intensity(struct backlight_device *dev)
{
	struct acx565akm_device *md = dev_get_drvdata(&dev->dev);

	dev_dbg(&dev->dev, "%s\n", __func__);

	if (!md->has_bc && md->dssdev->set_backlight == NULL)
		return -ENODEV;

	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
			dev->props.power == FB_BLANK_UNBLANK) {
		if (md->has_bc)
			return acx565akm_get_actual_brightness(md);
		else
			return dev->props.brightness;
	}

	return 0;
}
static int acx565akm_bl_get_intensity(struct backlight_device *dev)
{
	struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);

	dev_dbg(&dev->dev, "%s\n", __func__);

	if (!ddata->has_bc)
		return -ENODEV;

	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
			dev->props.power == FB_BLANK_UNBLANK) {
		if (ddata->has_bc)
			return acx565akm_get_actual_brightness(ddata);
		else
			return dev->props.brightness;
	}

	return 0;
}
static int acx_panel_probe(struct omap_dss_device *dssdev)
{
	int r;
	struct acx565akm_device *md = &acx_dev;
	struct backlight_device *bldev;
	int max_brightness, brightness;
	struct backlight_properties props;

	dev_dbg(&dssdev->dev, "%s\n", __func__);
	dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS |
					OMAP_DSS_LCD_IHS;
	/* FIXME AC bias ? */
	dssdev->panel.timings = acx_panel_timings;

	if (dssdev->platform_enable)
		dssdev->platform_enable(dssdev);
	/*
	 * After reset we have to wait 5 msec before the first
	 * command can be sent.
	 */
	msleep(5);

	md->enabled = panel_enabled(md);

	r = panel_detect(md);
	if (r) {
		dev_err(&dssdev->dev, "%s panel detect error\n", __func__);
		if (!md->enabled && dssdev->platform_disable)
			dssdev->platform_disable(dssdev);
		return r;
	}

	mutex_lock(&acx_dev.mutex);
	acx_dev.dssdev = dssdev;
	mutex_unlock(&acx_dev.mutex);

	if (!md->enabled) {
		if (dssdev->platform_disable)
			dssdev->platform_disable(dssdev);
	}

	/*------- Backlight control --------*/

	props.fb_blank = FB_BLANK_UNBLANK;
	props.power = FB_BLANK_UNBLANK;

	bldev = backlight_device_register("acx565akm", &md->spi->dev,
			md, &acx565akm_bl_ops, &props);
	md->bl_dev = bldev;
	if (md->has_cabc) {
		r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group);
		if (r) {
			dev_err(&bldev->dev,
				"%s failed to create sysfs files\n", __func__);
			backlight_device_unregister(bldev);
			return r;
		}
		md->cabc_mode = get_hw_cabc_mode(md);
	}

	if (md->has_bc)
		max_brightness = 255;
	else
		max_brightness = dssdev->max_backlight_level;

	if (md->has_bc)
		brightness = acx565akm_get_actual_brightness(md);
	else if (dssdev->get_backlight)
		brightness = dssdev->get_backlight(dssdev);
	else
		brightness = 0;

	bldev->props.max_brightness = max_brightness;
	bldev->props.brightness = brightness;

	acx565akm_bl_update_status(bldev);
	return 0;
}
static int acx565akm_probe(struct spi_device *spi)
{
	struct panel_drv_data *ddata;
	struct omap_dss_device *dssdev;
	struct backlight_device *bldev;
	int max_brightness, brightness;
	struct backlight_properties props;
	int r;

	dev_dbg(&spi->dev, "%s\n", __func__);

	spi->mode = SPI_MODE_3;

	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
	if (ddata == NULL)
		return -ENOMEM;

	dev_set_drvdata(&spi->dev, ddata);

	ddata->spi = spi;

	mutex_init(&ddata->mutex);

	if (dev_get_platdata(&spi->dev)) {
		r = acx565akm_probe_pdata(spi);
		if (r)
			return r;
	} else if (spi->dev.of_node) {
		r = acx565akm_probe_of(spi);
		if (r)
			return r;
	} else {
		dev_err(&spi->dev, "platform data missing!\n");
		return -ENODEV;
	}

	if (gpio_is_valid(ddata->reset_gpio)) {
		r = devm_gpio_request_one(&spi->dev, ddata->reset_gpio,
				GPIOF_OUT_INIT_LOW, "lcd reset");
		if (r)
			goto err_gpio;
	}

	if (gpio_is_valid(ddata->reset_gpio))
		gpio_set_value(ddata->reset_gpio, 1);

	/*
	 * After reset we have to wait 5 msec before the first
	 * command can be sent.
	 */
	usleep_range(5000, 10000);

	ddata->enabled = panel_enabled(ddata);

	r = panel_detect(ddata);

	if (!ddata->enabled && gpio_is_valid(ddata->reset_gpio))
		gpio_set_value(ddata->reset_gpio, 0);

	if (r) {
		dev_err(&spi->dev, "%s panel detect error\n", __func__);
		goto err_detect;
	}

	memset(&props, 0, sizeof(props));
	props.fb_blank = FB_BLANK_UNBLANK;
	props.power = FB_BLANK_UNBLANK;
	props.type = BACKLIGHT_RAW;

	bldev = backlight_device_register("acx565akm", &ddata->spi->dev,
			ddata, &acx565akm_bl_ops, &props);
	ddata->bl_dev = bldev;
	if (ddata->has_cabc) {
		r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group);
		if (r) {
			dev_err(&bldev->dev,
				"%s failed to create sysfs files\n", __func__);
			goto err_sysfs;
		}
		ddata->cabc_mode = get_hw_cabc_mode(ddata);
	}

	max_brightness = 255;

	if (ddata->has_bc)
		brightness = acx565akm_get_actual_brightness(ddata);
	else
		brightness = 0;

	bldev->props.max_brightness = max_brightness;
	bldev->props.brightness = brightness;

	acx565akm_bl_update_status(bldev);


	ddata->videomode = acx565akm_panel_timings;

	dssdev = &ddata->dssdev;
	dssdev->dev = &spi->dev;
	dssdev->driver = &acx565akm_ops;
	dssdev->type = OMAP_DISPLAY_TYPE_SDI;
	dssdev->owner = THIS_MODULE;
	dssdev->panel.timings = ddata->videomode;

	r = omapdss_register_display(dssdev);
	if (r) {
		dev_err(&spi->dev, "Failed to register panel\n");
		goto err_reg;
	}

	return 0;

err_reg:
	sysfs_remove_group(&bldev->dev.kobj, &bldev_attr_group);
err_sysfs:
	backlight_device_unregister(bldev);
err_detect:
err_gpio:
	omap_dss_put_device(ddata->in);
	return r;
}
static int acx565akm_panel_init(struct omap_display *display)
{
	struct omap_panel *panel = display->panel;
	struct acx565akm_panel_data *panel_data = display->hw_config.panel_data;
	struct acx565akm_device *md = (struct acx565akm_device*)panel->priv;

	struct backlight_device *bldev;
	int brightness;
	int max_brightness;
	int r;

	dev_dbg(&md->spi->dev, "%s\n", __func__);

	if (!panel_data) {
		dev_err(&md->spi->dev, "no panel data\n");
		return -ENODEV;
	}

	mutex_init(&md->mutex);
	md->display = display;

	if (display->hw_config.panel_enable != NULL)
		display->hw_config.panel_enable(display);
	/*
	 * After reset we have to wait 5 msec before the first
	 * command can be sent.
	 */
	msleep(5);

	md->enabled = panel_enabled(md);	//TianMa display not enabled if no code change

	r = panel_detect(md);
	if (r) {	//TianMa display will come here if no code change
		if (!md->enabled && display->hw_config.panel_disable != NULL)	//panel_disable is a func, means that if it exists
			display->hw_config.panel_disable(display);	//TianMa display will be disable if no code change
		mutex_unlock(&md->mutex);
		return r;
	}

	if (!panel_data->bc_connected) {
		md->has_bc = 0;
		md->has_cabc = 0;
	}

#if 0
	acx565akm_set_mode(display, panel->timings.x_res, panel->timings.y_res,
			  panel->bpp);
#endif

	if (!md->enabled)
		display->hw_config.panel_disable(display);

	bldev = backlight_device_register("acx565akm", &md->spi->dev,
			md, &acx565akm_bl_ops);
	md->bl_dev = bldev;

	if (md->has_cabc) {
		r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group);
		if (r) {
			dev_err(&bldev->dev, "failed to create sysfs files\n");
			backlight_device_unregister(bldev);
			return r;
		}
		md->cabc_mode = get_hw_cabc_mode(md);
	}

	bldev->props.fb_blank = FB_BLANK_UNBLANK;
	bldev->props.power = FB_BLANK_UNBLANK;

	if (md->has_bc)
		max_brightness = 255;
	else
		max_brightness = display->hw_config.max_backlight_level;

	if (md->has_bc)
		brightness = acx565akm_get_actual_brightness(md);
	else if (display->hw_config.get_backlight != NULL)
		brightness = display->hw_config.get_backlight(display);
	else
		brightness = 0;

	bldev->props.max_brightness = max_brightness;
	bldev->props.brightness = brightness;
	acx565akm_bl_update_status(bldev);

	return 0;
}