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, 7 insertions, 4 deletions

diff --git a/drivers/platform/x86/compal-laptop.c b/drivers/platform/x86/compal-laptop.c
index 2740b40aad9b..71ff1545a93e 100644
--- a/drivers/platform/x86/compal-laptop.c
+++ b/drivers/platform/x86/compal-laptop.c
@@ -291,12 +291,15 @@ static int __init compal_init(void)
         /* Register backlight stuff */
 
         if (!acpi_video_backlight_support()) {
-                compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
-                                                            &compalbl_ops);
+                struct backlight_properties props;
+                memset(&props, 0, sizeof(struct backlight_properties));
+                props.max_brightness = COMPAL_LCD_LEVEL_MAX - 1;
+                compalbl_device = backlight_device_register("compal-laptop",
+                                                            NULL, NULL,
+                                                            &compalbl_ops,
+                                                            &props);
                 if (IS_ERR(compalbl_device))
                         return PTR_ERR(compalbl_device);
-
-                compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
         }
 
         ret = platform_driver_register(&compal_driver);