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, 6 insertions, 3 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 2ff2b6ab5b6c..cbe6f3924a10 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -998,6 +998,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
         }
 
         if (acpi_video_backlight_support()) {
+                struct backlight_properties props;
                 int result;
                 static int count = 0;
                 char *name;
@@ -1010,12 +1011,14 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
                         return;
 
                 sprintf(name, "acpi_video%d", count++);
-                device->backlight = backlight_device_register(name,
-                        NULL, device, &acpi_backlight_ops);
+                memset(&props, 0, sizeof(struct backlight_properties));
+                props.max_brightness = device->brightness->count - 3;
+                device->backlight = backlight_device_register(name, NULL, device,
+                                                              &acpi_backlight_ops,
+                                                              &props);
                 kfree(name);
                 if (IS_ERR(device->backlight))
                         return;
-                device->backlight->props.max_brightness = device->brightness->count-3;
 
                 result = sysfs_create_link(&device->backlight->dev.kobj,
                                            &device->dev->dev.kobj, "device");