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/msi-laptop.c b/drivers/platform/x86/msi-laptop.c
index c2b05da4289a..996223a7c009 100644
--- a/drivers/platform/x86/msi-laptop.c
+++ b/drivers/platform/x86/msi-laptop.c
@@ -683,11 +683,14 @@ static int __init msi_init(void)
                 printk(KERN_INFO "MSI: Brightness ignored, must be controlled "
                        "by ACPI video driver\n");
         } else {
+                struct backlight_properties props;
+                memset(&props, 0, sizeof(struct backlight_properties));
+                props.max_brightness = MSI_LCD_LEVEL_MAX - 1;
                 msibl_device = backlight_device_register("msi-laptop-bl", NULL,
-                                                         NULL, &msibl_ops);
+                                                         NULL, &msibl_ops,
+                                                         &props);
                 if (IS_ERR(msibl_device))
                         return PTR_ERR(msibl_device);
-                msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
         }
 
         ret = platform_driver_register(&msipf_driver);