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, 8 insertions, 5 deletions

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index ef614979afe..46435ac4684 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -559,10 +559,14 @@ static int __init dell_init(void)
         release_buffer();
 
         if (max_intensity) {
-                dell_backlight_device = backlight_device_register(
-                        "dell_backlight",
-                        &platform_device->dev, NULL,
-                        &dell_ops);
+                struct backlight_properties props;
+                memset(&props, 0, sizeof(struct backlight_properties));
+                props.max_brightness = max_intensity;
+                dell_backlight_device = backlight_device_register("dell_backlight",
+                                                                  &platform_device->dev,
+                                                                  NULL,
+                                                                  &dell_ops,
+                                                                  &props);
 
                 if (IS_ERR(dell_backlight_device)) {
                         ret = PTR_ERR(dell_backlight_device);
@@ -570,7 +574,6 @@ static int __init dell_init(void)
                         goto fail_backlight;
                 }
 
-                dell_backlight_device->props.max_brightness = max_intensity;
                 dell_backlight_device->props.brightness =
                         dell_get_intensity(dell_backlight_device);
                 backlight_update_status(dell_backlight_device);