Merge branches 'ib-backlight-auxdisplay-staging-omap-6.9',...

Merge branches 'ib-backlight-auxdisplay-staging-omap-6.9', 'ib-backlight-auxdisplay-hid-fb-6.9' and 'ib-backlight-hid-fbdev-lcd-scripts-6.10' into ibs-for-backlight-merged

drivers/auxdisplay/ht16k33.c

@@ -290,16 +290,8 @@ static int ht16k33_bl_update_status(struct backlight_device *bl)
 	return ht16k33_brightness_set(priv, brightness);
 }
 
-static int ht16k33_bl_check_fb(struct backlight_device *bl, struct fb_info *fi)
-{
-	struct ht16k33_priv *priv = bl_get_data(bl);
-
-	return (fi == NULL) || (fi->par == priv);
-}
-
 static const struct backlight_ops ht16k33_bl_ops = {
 	.update_status	= ht16k33_bl_update_status,
-	.check_fb	= ht16k33_bl_check_fb,
 };
 
 /*

drivers/hid/hid-picolcd_backlight.c

@@ -9,7 +9,6 @@
 
 #include <linux/hid.h>
 
-#include <linux/fb.h>
 #include <linux/backlight.h>
 
 #include "hid-picolcd.h"
@@ -39,15 +38,9 @@ static int picolcd_set_brightness(struct backlight_device *bdev)
 	return 0;
 }
 
-static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb)
-{
-	return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev));
-}
-
 static const struct backlight_ops picolcd_blops = {
 	.update_status  = picolcd_set_brightness,
 	.get_brightness = picolcd_get_brightness,
-	.check_fb       = picolcd_check_bl_fb,
 };
 
 int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report)

drivers/hid/hid-picolcd_core.c

@@ -474,11 +474,6 @@ static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
 	if (error)
 		goto err;
 
-	/* Set up the framebuffer device */
-	error = picolcd_init_framebuffer(data);
-	if (error)
-		goto err;
-
 	/* Setup lcd class device */
 	error = picolcd_init_lcd(data, picolcd_out_report(REPORT_CONTRAST, hdev));
 	if (error)
@@ -489,6 +484,11 @@ static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
 	if (error)
 		goto err;
 
+	/* Set up the framebuffer device */
+	error = picolcd_init_framebuffer(data);
+	if (error)
+		goto err;
+
 	/* Setup the LED class devices */
 	error = picolcd_init_leds(data, picolcd_out_report(REPORT_LED_STATE, hdev));
 	if (error)
@@ -502,9 +502,9 @@ static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
 	return 0;
 err:
 	picolcd_exit_leds(data);
+	picolcd_exit_framebuffer(data);
 	picolcd_exit_backlight(data);
 	picolcd_exit_lcd(data);
-	picolcd_exit_framebuffer(data);
 	picolcd_exit_cir(data);
 	picolcd_exit_keys(data);
 	return error;
@@ -623,9 +623,9 @@ static void picolcd_remove(struct hid_device *hdev)
 	/* Cleanup LED */
 	picolcd_exit_leds(data);
 	/* Clean up the framebuffer */
+	picolcd_exit_framebuffer(data);
 	picolcd_exit_backlight(data);
 	picolcd_exit_lcd(data);
-	picolcd_exit_framebuffer(data);
 	/* Cleanup input */
 	picolcd_exit_cir(data);
 	picolcd_exit_keys(data);

drivers/hid/hid-picolcd_fb.c

@@ -493,6 +493,12 @@ int picolcd_init_framebuffer(struct picolcd_data *data)
 	info->fix = picolcdfb_fix;
 	info->fix.smem_len   = PICOLCDFB_SIZE*8;
 
+#ifdef CONFIG_FB_BACKLIGHT
+#ifdef CONFIG_HID_PICOLCD_BACKLIGHT
+	info->bl_dev = data->backlight;
+#endif
+#endif
+
 	fbdata = info->par;
 	spin_lock_init(&fbdata->lock);
 	fbdata->picolcd = data;

drivers/hid/hid-picolcd_lcd.c

@@ -46,7 +46,7 @@ static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb)
 	return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev));
 }
 
-static struct lcd_ops picolcd_lcdops = {
+static const struct lcd_ops picolcd_lcdops = {
 	.get_contrast   = picolcd_get_contrast,
 	.set_contrast   = picolcd_set_contrast,
 	.check_fb       = picolcd_check_lcd_fb,

drivers/video/backlight/aat2870_bl.c

@@ -12,7 +12,6 @@
 #include <linux/platform_device.h>
 #include <linux/mutex.h>
 #include <linux/delay.h>
-#include <linux/fb.h>
 #include <linux/backlight.h>
 #include <linux/mfd/aat2870.h>
 
@@ -90,15 +89,9 @@ static int aat2870_bl_update_status(struct backlight_device *bd)
 	return 0;
 }
 
-static int aat2870_bl_check_fb(struct backlight_device *bd, struct fb_info *fi)
-{
-	return 1;
-}
-
 static const struct backlight_ops aat2870_bl_ops = {
 	.options = BL_CORE_SUSPENDRESUME,
 	.update_status = aat2870_bl_update_status,
-	.check_fb = aat2870_bl_check_fb,
 };
 
 static int aat2870_bl_probe(struct platform_device *pdev)

drivers/video/backlight/ams369fg06.c

@@ -427,7 +427,7 @@ static int ams369fg06_set_brightness(struct backlight_device *bd)
 	return ret;
 }
 
-static struct lcd_ops ams369fg06_lcd_ops = {
+static const struct lcd_ops ams369fg06_lcd_ops = {
 	.get_power = ams369fg06_get_power,
 	.set_power = ams369fg06_set_power,
 };

drivers/video/backlight/backlight.c

@@ -98,7 +98,9 @@ static int fb_notifier_callback(struct notifier_block *self,
 {
 	struct backlight_device *bd;
 	struct fb_event *evdata = data;
-	int node = evdata->info->node;
+	struct fb_info *info = evdata->info;
+	struct backlight_device *fb_bd = fb_bl_device(info);
+	int node = info->node;
 	int fb_blank = 0;
 
 	/* If we aren't interested in this event, skip it immediately ... */
@@ -110,7 +112,9 @@ static int fb_notifier_callback(struct notifier_block *self,
 
 	if (!bd->ops)
 		goto out;
-	if (bd->ops->check_fb && !bd->ops->check_fb(bd, evdata->info))
+	if (bd->ops->controls_device && !bd->ops->controls_device(bd, info->device))
+		goto out;
+	if (fb_bd && fb_bd != bd)
 		goto out;
 
 	fb_blank = *(int *)evdata->data;

drivers/video/backlight/bd6107.c

@@ -99,18 +99,18 @@ static int bd6107_backlight_update_status(struct backlight_device *backlight)
 	return 0;
 }
 
-static int bd6107_backlight_check_fb(struct backlight_device *backlight,
-				       struct fb_info *info)
+static bool bd6107_backlight_controls_device(struct backlight_device *backlight,
+					     struct device *display_dev)
 {
 	struct bd6107 *bd = bl_get_data(backlight);
 
-	return !bd->pdata->dev || bd->pdata->dev == info->device;
+	return !bd->pdata->dev || bd->pdata->dev == display_dev;
 }
 
 static const struct backlight_ops bd6107_backlight_ops = {
-	.options	= BL_CORE_SUSPENDRESUME,
-	.update_status	= bd6107_backlight_update_status,
-	.check_fb	= bd6107_backlight_check_fb,
+	.options	 = BL_CORE_SUSPENDRESUME,
+	.update_status	 = bd6107_backlight_update_status,
+	.controls_device = bd6107_backlight_controls_device,
 };
 
 static int bd6107_probe(struct i2c_client *client)

drivers/video/backlight/corgi_lcd.c

@@ -380,7 +380,7 @@ static int corgi_lcd_get_power(struct lcd_device *ld)
 	return lcd->power;
 }
 
-static struct lcd_ops corgi_lcd_ops = {
+static const struct lcd_ops corgi_lcd_ops = {
 	.get_power	= corgi_lcd_get_power,
 	.set_power	= corgi_lcd_set_power,
 	.set_mode	= corgi_lcd_set_mode,

drivers/video/backlight/gpio_backlight.c

@@ -30,18 +30,18 @@ static int gpio_backlight_update_status(struct backlight_device *bl)
 	return 0;
 }
 
-static int gpio_backlight_check_fb(struct backlight_device *bl,
-				   struct fb_info *info)
+static bool gpio_backlight_controls_device(struct backlight_device *bl,
+					   struct device *display_dev)
 {
 	struct gpio_backlight *gbl = bl_get_data(bl);
 
-	return !gbl->dev || gbl->dev == info->device;
+	return !gbl->dev || gbl->dev == display_dev;
 }
 
 static const struct backlight_ops gpio_backlight_ops = {
-	.options	= BL_CORE_SUSPENDRESUME,
-	.update_status	= gpio_backlight_update_status,
-	.check_fb	= gpio_backlight_check_fb,
+	.options	 = BL_CORE_SUSPENDRESUME,
+	.update_status	 = gpio_backlight_update_status,
+	.controls_device = gpio_backlight_controls_device,
 };
 
 static int gpio_backlight_probe(struct platform_device *pdev)

drivers/video/backlight/hx8357.c

@@ -559,7 +559,7 @@ static int hx8357_get_power(struct lcd_device *lcdev)
 	return lcd->state;
 }
 
-static struct lcd_ops hx8357_ops = {
+static const struct lcd_ops hx8357_ops = {
 	.set_power	= hx8357_set_power,
 	.get_power	= hx8357_get_power,
 };

drivers/video/backlight/ili922x.c

@@ -472,7 +472,7 @@ static int ili922x_get_power(struct lcd_device *ld)
 	return ili->power;
 }
 
-static struct lcd_ops ili922x_ops = {
+static const struct lcd_ops ili922x_ops = {
 	.get_power = ili922x_get_power,
 	.set_power = ili922x_set_power,
 };

drivers/video/backlight/ili9320.c

@@ -161,7 +161,7 @@ static int ili9320_get_power(struct lcd_device *ld)
 	return lcd->power;
 }
 
-static struct lcd_ops ili9320_ops = {
+static const struct lcd_ops ili9320_ops = {
 	.get_power	= ili9320_get_power,
 	.set_power	= ili9320_set_power,
 };

drivers/video/backlight/jornada720_lcd.c

@@ -81,7 +81,7 @@ static int jornada_lcd_set_power(struct lcd_device *ld, int power)
 	return 0;
 }
 
-static struct lcd_ops jornada_lcd_props = {
+static const struct lcd_ops jornada_lcd_props = {
 	.get_contrast = jornada_lcd_get_contrast,
 	.set_contrast = jornada_lcd_set_contrast,
 	.get_power = jornada_lcd_get_power,

drivers/video/backlight/l4f00242t03.c

@@ -158,7 +158,7 @@ static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
 	return 0;
 }
 
-static struct lcd_ops l4f_ops = {
+static const struct lcd_ops l4f_ops = {
 	.set_power	= l4f00242t03_lcd_power_set,
 	.get_power	= l4f00242t03_lcd_power_get,
 };

drivers/video/backlight/lcd.c

@@ -188,7 +188,7 @@ ATTRIBUTE_GROUPS(lcd_device);
  * or a pointer to the newly allocated device.
  */
 struct lcd_device *lcd_device_register(const char *name, struct device *parent,
-		void *devdata, struct lcd_ops *ops)
+		void *devdata, const struct lcd_ops *ops)
 {
 	struct lcd_device *new_ld;
 	int rc;
@@ -276,7 +276,7 @@ static int devm_lcd_device_match(struct device *dev, void *res, void *data)
  */
 struct lcd_device *devm_lcd_device_register(struct device *dev,
 		const char *name, struct device *parent,
-		void *devdata, struct lcd_ops *ops)
+		void *devdata, const struct lcd_ops *ops)
 {
 	struct lcd_device **ptr, *lcd;
 

drivers/video/backlight/lms283gf05.c

@@ -139,7 +139,7 @@ static int lms283gf05_power_set(struct lcd_device *ld, int power)
 	return 0;
 }
 
-static struct lcd_ops lms_ops = {
+static const struct lcd_ops lms_ops = {
 	.set_power	= lms283gf05_power_set,
 	.get_power	= NULL,
 };

drivers/video/backlight/lms501kf03.c

@@ -304,7 +304,7 @@ static int lms501kf03_set_power(struct lcd_device *ld, int power)
 	return lms501kf03_power(lcd, power);
 }
 
-static struct lcd_ops lms501kf03_lcd_ops = {
+static const struct lcd_ops lms501kf03_lcd_ops = {
 	.get_power = lms501kf03_get_power,
 	.set_power = lms501kf03_set_power,
 };

drivers/video/backlight/ltv350qv.c

@@ -217,7 +217,7 @@ static int ltv350qv_get_power(struct lcd_device *ld)
 	return lcd->power;
 }
 
-static struct lcd_ops ltv_ops = {
+static const struct lcd_ops ltv_ops = {
 	.get_power	= ltv350qv_get_power,
 	.set_power	= ltv350qv_set_power,
 };

drivers/video/backlight/lv5207lp.c

@@ -62,18 +62,18 @@ static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
 	return 0;
 }
 
-static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
-				       struct fb_info *info)
+static bool lv5207lp_backlight_controls_device(struct backlight_device *backlight,
+					       struct device *display_dev)
 {
 	struct lv5207lp *lv = bl_get_data(backlight);
 
-	return !lv->pdata->dev || lv->pdata->dev == info->device;
+	return !lv->pdata->dev || lv->pdata->dev == display_dev;
 }
 
 static const struct backlight_ops lv5207lp_backlight_ops = {
-	.options	= BL_CORE_SUSPENDRESUME,
-	.update_status	= lv5207lp_backlight_update_status,
-	.check_fb	= lv5207lp_backlight_check_fb,
+	.options	 = BL_CORE_SUSPENDRESUME,
+	.update_status	 = lv5207lp_backlight_update_status,
+	.controls_device = lv5207lp_backlight_controls_device,
 };
 
 static int lv5207lp_probe(struct i2c_client *client)

drivers/video/backlight/otm3225a.c

@@ -205,7 +205,7 @@ static int otm3225a_get_power(struct lcd_device *ld)
 	return dd->power;
 }
 
-static struct lcd_ops otm3225a_ops = {
+static const struct lcd_ops otm3225a_ops = {
 	.set_power = otm3225a_set_power,
 	.get_power = otm3225a_get_power,
 };

drivers/video/backlight/platform_lcd.c

@@ -62,7 +62,7 @@ static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
 	return plcd->us->parent == info->device;
 }
 
-static struct lcd_ops platform_lcd_ops = {
+static const struct lcd_ops platform_lcd_ops = {
 	.get_power	= platform_lcd_get_power,
 	.set_power	= platform_lcd_set_power,
 	.check_fb	= platform_lcd_match,

drivers/video/backlight/pwm_bl.c

@@ -11,7 +11,6 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
-#include <linux/fb.h>
 #include <linux/backlight.h>
 #include <linux/err.h>
 #include <linux/pwm.h>
@@ -34,7 +33,6 @@ struct pwm_bl_data {
 					  int brightness);
 	void			(*notify_after)(struct device *,
 					int brightness);
-	int			(*check_fb)(struct device *, struct fb_info *);
 	void			(*exit)(struct device *);
 };
 
@@ -129,17 +127,8 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
 	return 0;
 }
 
-static int pwm_backlight_check_fb(struct backlight_device *bl,
-				  struct fb_info *info)
-{
-	struct pwm_bl_data *pb = bl_get_data(bl);
-
-	return !pb->check_fb || pb->check_fb(pb->dev, info);
-}
-
 static const struct backlight_ops pwm_backlight_ops = {
 	.update_status	= pwm_backlight_update_status,
-	.check_fb	= pwm_backlight_check_fb,
 };
 
 #ifdef CONFIG_OF
@@ -482,7 +471,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 
 	pb->notify = data->notify;
 	pb->notify_after = data->notify_after;
-	pb->check_fb = data->check_fb;
 	pb->exit = data->exit;
 	pb->dev = &pdev->dev;
 	pb->enabled = false;

drivers/video/backlight/tdo24m.c

@@ -322,7 +322,7 @@ static int tdo24m_set_mode(struct lcd_device *ld, struct fb_videomode *m)
 	return lcd->adj_mode(lcd, mode);
 }
 
-static struct lcd_ops tdo24m_ops = {
+static const struct lcd_ops tdo24m_ops = {
 	.get_power	= tdo24m_get_power,
 	.set_power	= tdo24m_set_power,
 	.set_mode	= tdo24m_set_mode,

drivers/video/fbdev/clps711x-fb.c

@@ -197,7 +197,7 @@ static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank)
 	return 0;
 }
 
-static struct lcd_ops clps711x_lcd_ops = {
+static const struct lcd_ops clps711x_lcd_ops = {
 	.check_fb	= clps711x_lcd_check_fb,
 	.get_power	= clps711x_lcd_get_power,
 	.set_power	= clps711x_lcd_set_power,

drivers/video/fbdev/core/fb_backlight.c

@@ -30,4 +30,10 @@ void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
 	mutex_unlock(&fb_info->bl_curve_mutex);
 }
 EXPORT_SYMBOL_GPL(fb_bl_default_curve);
+
+struct backlight_device *fb_bl_device(struct fb_info *info)
+{
+	return info->bl_dev;
+}
+EXPORT_SYMBOL(fb_bl_device);
 #endif

drivers/video/fbdev/imxfb.c

@@ -857,7 +857,7 @@ static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power)
 	return 0;
 }
 
-static struct lcd_ops imxfb_lcd_ops = {
+static const struct lcd_ops imxfb_lcd_ops = {
 	.check_fb	= imxfb_lcd_check_fb,
 	.get_contrast	= imxfb_lcd_get_contrast,
 	.set_contrast	= imxfb_lcd_set_contrast,

drivers/video/fbdev/omap/lcd_ams_delta.c

@@ -76,7 +76,7 @@ static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
 	return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
 }
 
-static struct lcd_ops ams_delta_lcd_ops = {
+static const struct lcd_ops ams_delta_lcd_ops = {
 	.get_power = ams_delta_lcd_get_power,
 	.set_power = ams_delta_lcd_set_power,
 	.get_contrast = ams_delta_lcd_get_contrast,

drivers/video/fbdev/sh_mobile_lcdcfb.c

@@ -2140,17 +2140,10 @@ static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev)
 	return ch->bl_brightness;
 }
 
-static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev,
-				   struct fb_info *info)
-{
-	return (info->bl_dev == bdev);
-}
-
 static const struct backlight_ops sh_mobile_lcdc_bl_ops = {
 	.options	= BL_CORE_SUSPENDRESUME,
 	.update_status	= sh_mobile_lcdc_update_bl,
 	.get_brightness	= sh_mobile_lcdc_get_brightness,
-	.check_fb	= sh_mobile_lcdc_check_fb,
 };
 
 static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent,

drivers/video/fbdev/ssd1307fb.c

@@ -530,17 +530,10 @@ static int ssd1307fb_get_brightness(struct backlight_device *bdev)
 	return par->contrast;
 }
 
-static int ssd1307fb_check_fb(struct backlight_device *bdev,
-				   struct fb_info *info)
-{
-	return (info->bl_dev == bdev);
-}
-
 static const struct backlight_ops ssd1307fb_bl_ops = {
 	.options	= BL_CORE_SUSPENDRESUME,
 	.update_status	= ssd1307fb_update_bl,
 	.get_brightness	= ssd1307fb_get_brightness,
-	.check_fb	= ssd1307fb_check_fb,
 };
 
 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1305_deviceinfo = {
@@ -594,7 +587,6 @@ static int ssd1307fb_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct backlight_device *bl;
-	char bl_name[12];
 	struct fb_info *info;
 	struct fb_deferred_io *ssd1307fb_defio;
 	u32 vmem_size;
@@ -733,31 +725,30 @@ static int ssd1307fb_probe(struct i2c_client *client)
 	if (ret)
 		goto regulator_enable_error;
 
-	ret = register_framebuffer(info);
-	if (ret) {
-		dev_err(dev, "Couldn't register the framebuffer\n");
-		goto panel_init_error;
-	}
-
-	snprintf(bl_name, sizeof(bl_name), "ssd1307fb%d", info->node);
-	bl = backlight_device_register(bl_name, dev, par, &ssd1307fb_bl_ops,
+	bl = backlight_device_register("ssd1307fb-bl", dev, par, &ssd1307fb_bl_ops,
 				       NULL);
 	if (IS_ERR(bl)) {
 		ret = PTR_ERR(bl);
 		dev_err(dev, "unable to register backlight device: %d\n", ret);
-		goto bl_init_error;
+		goto panel_init_error;
+	}
+	info->bl_dev = bl;
+
+	ret = register_framebuffer(info);
+	if (ret) {
+		dev_err(dev, "Couldn't register the framebuffer\n");
+		goto fb_init_error;
 	}
 
 	bl->props.brightness = par->contrast;
 	bl->props.max_brightness = MAX_CONTRAST;
-	info->bl_dev = bl;
 
 	dev_info(dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size);
 
 	return 0;
 
-bl_init_error:
-	unregister_framebuffer(info);
+fb_init_error:
+	backlight_device_unregister(bl);
 panel_init_error:
 	pwm_disable(par->pwm);
 	pwm_put(par->pwm);

include/linux/backlight.h

@@ -13,6 +13,7 @@
 #include <linux/fb.h>
 #include <linux/mutex.h>
 #include <linux/notifier.h>
+#include <linux/types.h>
 
 /**
  * enum backlight_update_reason - what method was used to update backlight
@@ -110,7 +111,6 @@ enum backlight_scale {
 };
 
 struct backlight_device;
-struct fb_info;
 
 /**
  * struct backlight_ops - backlight operations
@@ -160,18 +160,18 @@ struct backlight_ops {
 	int (*get_brightness)(struct backlight_device *);
 
 	/**
-	 * @check_fb: Check the framebuffer device.
+	 * @controls_device: Check against the display device
 	 *
-	 * Check if given framebuffer device is the one bound to this backlight.
-	 * This operation is optional and if not implemented it is assumed that the
-	 * fbdev is always the one bound to the backlight.
+	 * Check if the backlight controls the given display device. This
+	 * operation is optional and if not implemented it is assumed that
+	 * the display is always the one controlled by the backlight.
 	 *
 	 * RETURNS:
 	 *
-	 * If info is NULL or the info matches the fbdev bound to the backlight return true.
-	 * If info does not match the fbdev bound to the backlight return false.
+	 * If display_dev is NULL or display_dev matches the device controlled by
+	 * the backlight, return true. Otherwise return false.
 	 */
-	int (*check_fb)(struct backlight_device *bd, struct fb_info *info);
+	bool (*controls_device)(struct backlight_device *bd, struct device *display_dev);
 };
 
 /**

include/linux/fb.h

@@ -738,6 +738,15 @@ extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev);
 extern void framebuffer_release(struct fb_info *info);
 extern void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max);
 
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
+struct backlight_device *fb_bl_device(struct fb_info *info);
+#else
+static inline struct backlight_device *fb_bl_device(struct fb_info *info)
+{
+	return NULL;
+}
+#endif
+
 /* fbmon.c */
 #define FB_MAXTIMINGS		0
 #define FB_VSYNCTIMINGS		1

include/linux/lcd.h

@@ -61,7 +61,7 @@ struct lcd_device {
 	   points to something in the body of that driver, it is also invalid. */
 	struct mutex ops_lock;
 	/* If this is NULL, the backing module is unloaded */
-	struct lcd_ops *ops;
+	const struct lcd_ops *ops;
 	/* Serialise access to set_power method */
 	struct mutex update_lock;
 	/* The framebuffer notifier block */
@@ -102,10 +102,10 @@ static inline void lcd_set_power(struct lcd_device *ld, int power)
 }
 
 extern struct lcd_device *lcd_device_register(const char *name,
-	struct device *parent, void *devdata, struct lcd_ops *ops);
+	struct device *parent, void *devdata, const struct lcd_ops *ops);
 extern struct lcd_device *devm_lcd_device_register(struct device *dev,
 	const char *name, struct device *parent,
-	void *devdata, struct lcd_ops *ops);
+	void *devdata, const struct lcd_ops *ops);
 extern void lcd_device_unregister(struct lcd_device *ld);
 extern void devm_lcd_device_unregister(struct device *dev,
 	struct lcd_device *ld);

include/linux/pwm_backlight.h

@@ -19,7 +19,6 @@ struct platform_pwm_backlight_data {
 	int (*notify)(struct device *dev, int brightness);
 	void (*notify_after)(struct device *dev, int brightness);
 	void (*exit)(struct device *dev);
-	int (*check_fb)(struct device *dev, struct fb_info *info);
 };
 
 #endif

scripts/const_structs.checkpatch

@@ -39,6 +39,7 @@ kgdb_arch
 kgdb_io
 kobj_type
 kset_uevent_ops
+lcd_ops
 lock_manager_operations
 machine_desc
 microcode_ops