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, 3 deletions

diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c
index 035a7dd65a3f..6670ed8f9e5b 100644
--- a/drivers/platform/x86/classmate-laptop.c
+++ b/drivers/platform/x86/classmate-laptop.c
@@ -462,11 +462,13 @@ static struct backlight_ops cmpc_bl_ops = {
 
 static int cmpc_bl_add(struct acpi_device *acpi)
 {
+        struct backlight_properties props;
         struct backlight_device *bd;
 
-        bd = backlight_device_register("cmpc_bl", &acpi->dev,
-                                       acpi->handle, &cmpc_bl_ops);
-        bd->props.max_brightness = 7;
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = 7;
+        bd = backlight_device_register("cmpc_bl", &acpi->dev, acpi->handle,
+                                       &cmpc_bl_ops, &props);
         dev_set_drvdata(&acpi->dev, bd);
         return 0;
 }