msi-laptop: 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>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/platform/x86/msi-laptop.c b/drivers/platform/x86/msi-laptop.c
index 085987730aabbe6ac6e15f588ad11b04ce311e39..42317704629dba4f5b35ee1ac1c8aaa7b85ae3c1 100644 (file)
--- a/drivers/platform/x86/msi-laptop.c
+++ b/drivers/platform/x86/msi-laptop.c
@@ -64,6 +64,7 @@
 #include <linux/i8042.h>
 #include <linux/input.h>
 #include <linux/input/sparse-keymap.h>
+#include <acpi/video.h>
 
 #define MSI_DRIVER_VERSION "0.5"
 
@@ -1069,9 +1070,8 @@ static int __init msi_init(void)
 
        /* Register backlight stuff */
 
-       if (!quirks->old_ec_model || acpi_video_backlight_support()) {
-               pr_info("Brightness ignored, must be controlled by ACPI video driver\n");
-       } else {
+       if (quirks->old_ec_model ||
+           acpi_video_get_backlight_type() == acpi_backlight_vendor) {
                struct backlight_properties props;
                memset(&props, 0, sizeof(struct backlight_properties));
                props.type = BACKLIGHT_PLATFORM;