acer-wmi: Port to new backlight interface selection API

Port the backlight selection logic to the new backlight interface
selection API.

This commit also removes various obsolete pr_xxx messages related to
backlight interface selection. These are obsolete because they assume
there is only a vendor or acpi backlight driver and no other choice.
Also they are not necessary, if the user wants to know which backlight
interfaces are registered a simple "ls /sys/class/backlight" suffices.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Lee, Chun-Yi <jlee@suse.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 3ac29a1e8f92..f6b280dbfb33 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -2246,14 +2246,10 @@ static int __init acer_wmi_init(void)
         set_quirks();
 
         if (dmi_check_system(video_vendor_dmi_table))
-                acpi_video_dmi_promote_vendor();
-        if (acpi_video_backlight_support()) {
+                acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);
+
+        if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
                 interface->capability &= ~ACER_CAP_BRIGHTNESS;
-                pr_info("Brightness must be controlled by acpi video driver\n");
-        } else {
-                pr_info("Disabling ACPI video driver\n");
-                acpi_video_unregister_backlight();
-        }
 
         if (wmi_has_guid(WMID_GUID3)) {
                 if (ec_raw_mode) {