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, 9 insertions, 6 deletions

diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c
index fcd6a61a91eb..59769e85d41c 100644
--- a/drivers/video/omap2/displays/panel-taal.c
+++ b/drivers/video/omap2/displays/panel-taal.c
@@ -486,6 +486,7 @@ static struct attribute_group taal_attr_group = {
 
 static int taal_probe(struct omap_dss_device *dssdev)
 {
+        struct backlight_properties props;
         struct taal_data *td;
         struct backlight_device *bldev;
         int r;
@@ -520,11 +521,16 @@ static int taal_probe(struct omap_dss_device *dssdev)
 
         /* if no platform set_backlight() defined, presume DSI backlight
          * control */
+        memset(&props, 0, sizeof(struct backlight_properties));
         if (!dssdev->set_backlight)
                 td->use_dsi_bl = true;
 
+        if (td->use_dsi_bl)
+                props.max_brightness = 255;
+        else
+                props.max_brightness = 127;
         bldev = backlight_device_register("taal", &dssdev->dev, dssdev,
-                        &taal_bl_ops);
+                                          &taal_bl_ops, &props);
         if (IS_ERR(bldev)) {
                 r = PTR_ERR(bldev);
                 goto err2;
@@ -534,13 +540,10 @@ static int taal_probe(struct omap_dss_device *dssdev)
 
         bldev->props.fb_blank = FB_BLANK_UNBLANK;
         bldev->props.power = FB_BLANK_UNBLANK;
-        if (td->use_dsi_bl) {
-                bldev->props.max_brightness = 255;
+        if (td->use_dsi_bl)
                 bldev->props.brightness = 255;
-        } else {
-                bldev->props.max_brightness = 127;
+        else
                 bldev->props.brightness = 127;
-        }
 
         taal_bl_update_status(bldev);