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, 2 deletions

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 226b3e93498c..cbca40aa4006 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -922,9 +922,13 @@ static struct backlight_ops acer_bl_ops = {
 
 static int __devinit acer_backlight_init(struct device *dev)
 {
+        struct backlight_properties props;
         struct backlight_device *bd;
 
-        bd = backlight_device_register("acer-wmi", dev, NULL, &acer_bl_ops);
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = max_brightness;
+        bd = backlight_device_register("acer-wmi", dev, NULL, &acer_bl_ops,
+                                       &props);
         if (IS_ERR(bd)) {
                 printk(ACER_ERR "Could not register Acer backlight device\n");
                 acer_backlight_device = NULL;
@@ -935,7 +939,6 @@ static int __devinit acer_backlight_init(struct device *dev)
 
         bd->props.power = FB_BLANK_UNBLANK;
         bd->props.brightness = read_brightness(bd);
-        bd->props.max_brightness = max_brightness;
         backlight_update_status(bd);
         return 0;
 }