From a60b21763cce01c64cc537869662b41429c62e5f Mon Sep 17 00:00:00 2001
From: Corentin Chary <corentin.chary@gmail.com>
Date: Wed, 13 Jun 2012 09:32:02 +0200
Subject: drivers-platform-x86: use acpi_video_dmi_promote_vendor()

Instead of using directly acpi_video_unregister(), use
acpi_video_dmi_promote_vendor() (and make it call
acpi_video_unregister() if needed)

Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 175809d..377d92d 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -2191,14 +2191,16 @@ 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()) {
-		if (dmi_check_system(video_vendor_dmi_table)) {
-			acpi_video_unregister();
-		} else {
-			interface->capability &= ~ACER_CAP_BRIGHTNESS;
-			pr_info("Brightness must be controlled by "
-				"acpi video driver\n");
-		}
+		interface->capability &= ~ACER_CAP_BRIGHTNESS;
+		pr_info("Brightness must be controlled by acpi video driver\n");
+	} else {
+#ifdef CONFIG_ACPI_VIDEO
+		pr_info("Disabling ACPI video driver\n");
+		acpi_video_unregister();
+#endif
 	}
 
 	if (wmi_has_guid(WMID_GUID3)) {
diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index 694a15a..905fa01 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -193,7 +193,10 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
 	 * backlight control and supports more levels than other options.
 	 * Disable the other backlight choices.
 	 */
+	acpi_video_dmi_promote_vendor();
+#ifdef CONFIG_ACPI_VIDEO
 	acpi_video_unregister();
+#endif
 	apple_bl_unregister();
 
 	return 0;
@@ -213,7 +216,10 @@ static void __devexit gmux_remove(struct pnp_dev *pnp)
 	release_region(gmux_data->iostart, gmux_data->iolen);
 	kfree(gmux_data);
 
+	acpi_video_dmi_demote_vendor();
+#ifdef CONFIG_ACPI_VIDEO
 	acpi_video_register();
+#endif
 	apple_bl_register();
 }
 
diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
index e2a34b4..2cbccc1 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -26,7 +26,7 @@
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/ctype.h>
-#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
+#ifdef CONFIG_ACPI_VIDEO
 #include <acpi/video.h>
 #endif
 
@@ -1530,15 +1530,18 @@ static int __init samsung_init(void)
 	samsung->quirks = quirks;
 
 
-#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
+#ifdef CONFIG_ACPI
+	if (samsung->quirks->broken_acpi_video)
+		acpi_video_dmi_promote_vendor();
+
 	/* Don't handle backlight here if the acpi video already handle it */
 	if (acpi_video_backlight_support()) {
-		if (samsung->quirks->broken_acpi_video) {
-			pr_info("Disabling ACPI video driver\n");
-			acpi_video_unregister();
-		} else {
-			samsung->handle_backlight = false;
-		}
+		samsung->handle_backlight = false;
+	} else if (samsung->quirks->broken_acpi_video) {
+		pr_info("Disabling ACPI video driver\n");
+#ifdef CONFIG_ACPI_VIDEO
+		acpi_video_unregister();
+#endif
 	}
 #endif
 
@@ -1552,8 +1555,7 @@ static int __init samsung_init(void)
 
 #ifdef CONFIG_ACPI
 	/* Only log that if we are really on a sabi platform */
-	if (acpi_video_backlight_support() &&
-	    !samsung->quirks->broken_acpi_video)
+	if (acpi_video_backlight_support())
 		pr_info("Backlight controlled by ACPI video driver\n");
 #endif
 
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