backlight: Allow properties to be passed at registration

Values such as max_brightness should be set before backlights are
registered, but the current API doesn't allow that. Add a parameter to
backlight_device_register and update drivers to ensure that they
set this correctly.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 3d886c6902f9..11de3bfd4e54 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -117,6 +117,7 @@ static struct backlight_ops atmel_lcdc_bl_ops = {
 
 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 {
+        struct backlight_properties props;
         struct backlight_device *bl;
 
         sinfo->bl_power = FB_BLANK_UNBLANK;
@@ -124,8 +125,10 @@ static void init_backlight(struct atmel_lcdfb_info *sinfo)
         if (sinfo->backlight)
                 return;
 
-        bl = backlight_device_register("backlight", &sinfo->pdev->dev,
-                        sinfo, &atmel_lcdc_bl_ops);
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = 0xff;
+        bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
+                                       &atmel_lcdc_bl_ops, &props);
         if (IS_ERR(bl)) {
                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
                                 PTR_ERR(bl));
@@ -135,7 +138,6 @@ static void init_backlight(struct atmel_lcdfb_info *sinfo)
 
         bl->props.power = FB_BLANK_UNBLANK;
         bl->props.fb_blank = FB_BLANK_UNBLANK;
-        bl->props.max_brightness = 0xff;
         bl->props.brightness = atmel_bl_get_brightness(bl);
 }