From 087e273dbc3be20a95cd332723430e1003fb7933 Mon Sep 17 00:00:00 2001
From: Mario Schwalbe <schwalbe@inf.tu-dresden.de>
Date: Sun, 11 Jan 2009 00:19:31 +0000
Subject: [PATCH] --- yaml --- r: 142053 b: refs/heads/master c:
 1a468ba10c3bdbc25ef7aa7fecda20ee27007bdf h: refs/heads/master i:   142051:
 61db9209a8c94f409fbfe7ae7adb0121dfb12eb5 v: v3

---
 [refs]                                        |  2 +-
 trunk/drivers/video/backlight/mbp_nvidia_bl.c | 33 +++++++++++++++++--
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 5a4413e01be9..b2746aaa7194 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c78a628849675580c7c5e1f07193c632e4b6827f
+refs/heads/master: 1a468ba10c3bdbc25ef7aa7fecda20ee27007bdf
diff --git a/trunk/drivers/video/backlight/mbp_nvidia_bl.c b/trunk/drivers/video/backlight/mbp_nvidia_bl.c
index ce09b83244ac..3bb4c0a50c62 100644
--- a/trunk/drivers/video/backlight/mbp_nvidia_bl.c
+++ b/trunk/drivers/video/backlight/mbp_nvidia_bl.c
@@ -36,6 +36,11 @@ struct dmi_match_data {
 	struct backlight_ops backlight_ops;
 };
 
+/* Module parameters. */
+static int debug;
+module_param_named(debug, debug, int, 0644);
+MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");
+
 /*
  * Implementation for MacBooks with Intel chipset.
  */
@@ -43,6 +48,10 @@ static int intel_chipset_send_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
+	if (debug)
+		printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
+		       intensity);
+
 	outb(0x04 | (intensity << 4), 0xb3);
 	outb(0xbf, 0xb2);
 	return 0;
@@ -50,9 +59,17 @@ static int intel_chipset_send_intensity(struct backlight_device *bd)
 
 static int intel_chipset_get_intensity(struct backlight_device *bd)
 {
+	int intensity;
+
 	outb(0x03, 0xb3);
 	outb(0xbf, 0xb2);
-	return inb(0xb3) >> 4;
+	intensity = inb(0xb3) >> 4;
+
+	if (debug)
+		printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
+		       intensity);
+
+	return intensity;
 }
 
 static const struct dmi_match_data intel_chipset_data = {
@@ -72,6 +89,10 @@ static int nvidia_chipset_send_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 
+	if (debug)
+		printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
+		       intensity);
+
 	outb(0x04 | (intensity << 4), 0x52f);
 	outb(0xbf, 0x52e);
 	return 0;
@@ -79,9 +100,17 @@ static int nvidia_chipset_send_intensity(struct backlight_device *bd)
 
 static int nvidia_chipset_get_intensity(struct backlight_device *bd)
 {
+	int intensity;
+
 	outb(0x03, 0x52f);
 	outb(0xbf, 0x52e);
-	return inb(0x52f) >> 4;
+	intensity = inb(0x52f) >> 4;
+
+	if (debug)
+		printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
+		       intensity);
+
+	return intensity;
 }
 
 static const struct dmi_match_data nvidia_chipset_data = {