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, 3 deletions

diff --git a/drivers/video/backlight/mbp_nvidia_bl.c b/drivers/video/backlight/mbp_nvidia_bl.c
index 2e78b0784bdc..0881358eeace 100644
--- a/drivers/video/backlight/mbp_nvidia_bl.c
+++ b/drivers/video/backlight/mbp_nvidia_bl.c
@@ -250,6 +250,7 @@ static const struct dmi_system_id __initdata mbp_device_table[] = {
 
 static int __init mbp_init(void)
 {
+        struct backlight_properties props;
         if (!dmi_check_system(mbp_device_table))
                 return -ENODEV;
 
@@ -257,14 +258,17 @@ static int __init mbp_init(void)
                                                 "Macbook Pro backlight"))
                 return -ENXIO;
 
-        mbp_backlight_device = backlight_device_register("mbp_backlight",
-                                        NULL, NULL, &driver_data->backlight_ops);
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = 15;
+        mbp_backlight_device = backlight_device_register("mbp_backlight", NULL,
+                                                         NULL,
+                                                         &driver_data->backlight_ops,
+                                                         &props);
         if (IS_ERR(mbp_backlight_device)) {
                 release_region(driver_data->iostart, driver_data->iolen);
                 return PTR_ERR(mbp_backlight_device);
         }
 
-        mbp_backlight_device->props.max_brightness = 15;
         mbp_backlight_device->props.brightness =
                 driver_data->backlight_ops.get_brightness(mbp_backlight_device);
         backlight_update_status(mbp_backlight_device);