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/platform/x86/msi-wmi.c b/drivers/platform/x86/msi-wmi.c
index f5f70d4c6913..fb7ccaae6563 100644
--- a/drivers/platform/x86/msi-wmi.c
+++ b/drivers/platform/x86/msi-wmi.c
@@ -249,12 +249,15 @@ static int __init msi_wmi_init(void)
                 goto err_uninstall_notifier;
 
         if (!acpi_video_backlight_support()) {
-                backlight = backlight_device_register(DRV_NAME,
-                                NULL, NULL, &msi_backlight_ops);
+                struct backlight_properties props;
+                memset(&props, 0, sizeof(struct backlight_properties));
+                props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
+                backlight = backlight_device_register(DRV_NAME, NULL, NULL,
+                                                      &msi_backlight_ops,
+                                                      &props);
                 if (IS_ERR(backlight))
                         goto err_free_input;
 
-                backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
                 err = bl_get(NULL);
                 if (err < 0)
                         goto err_free_backlight;