linux-kernel - [PATCH v2 2/2] platform/x86: fujitsu-laptop: simplify brightness key event generation logic

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Date:   Wed,  1 Mar 2017 07:42:54 +0100
From:   Michał Kępień <kernel@...pniu.pl>
To:     Jonathan Woithe <jwoithe@...t42.net>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] platform/x86: fujitsu-laptop: simplify brightness key event generation logic

Returning early when there is no brightness change allows removal of a
duplicate code block, makes the purpose of the following code clearer
and allows the condition surrounding key event generation to be removed.
Local integer variables can also be declared in a single line.

Signed-off-by: Michał Kępień <kernel@...pniu.pl>
---
 drivers/platform/x86/fujitsu-laptop.c | 40 +++++++++++++----------------------
 1 file changed, 15 insertions(+), 25 deletions(-)

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index b19f6e1c0173..4a5e7b60a672 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -790,8 +790,7 @@ static int acpi_fujitsu_bl_remove(struct acpi_device *device)
 static void acpi_fujitsu_bl_notify(struct acpi_device *device, u32 event)
 {
 	struct input_dev *input;
-	int keycode;
-	int oldb, newb;
+	int oldb, newb, keycode;
 
 	input = fujitsu_bl->input;
 
@@ -806,7 +805,6 @@ static void acpi_fujitsu_bl_notify(struct acpi_device *device, u32 event)
 		return;
 	}
 
-	keycode = 0;
 	oldb = fujitsu_bl->brightness_level;
 	get_lcd_level();
 	newb = fujitsu_bl->brightness_level;
@@ -815,30 +813,22 @@ static void acpi_fujitsu_bl_notify(struct acpi_device *device, u32 event)
 		    "brightness button event [%i -> %i (%i)]\n",
 		    oldb, newb, fujitsu_bl->brightness_changed);
 
-	if (oldb < newb) {
-		if (disable_brightness_adjust != 1) {
-			if (use_alt_lcd_levels)
-				set_lcd_level_alt(newb);
-			else
-				set_lcd_level(newb);
-		}
-		keycode = KEY_BRIGHTNESSUP;
-	} else if (oldb > newb) {
-		if (disable_brightness_adjust != 1) {
-			if (use_alt_lcd_levels)
-				set_lcd_level_alt(newb);
-			else
-				set_lcd_level(newb);
-		}
-		keycode = KEY_BRIGHTNESSDOWN;
-	}
+	if (oldb == newb)
+		return;
 
-	if (keycode != 0) {
-		input_report_key(input, keycode, 1);
-		input_sync(input);
-		input_report_key(input, keycode, 0);
-		input_sync(input);
+	if (disable_brightness_adjust != 1) {
+		if (use_alt_lcd_levels)
+			set_lcd_level_alt(newb);
+		else
+			set_lcd_level(newb);
 	}
+
+	keycode = oldb < newb ? KEY_BRIGHTNESSUP : KEY_BRIGHTNESSDOWN;
+
+	input_report_key(input, keycode, 1);
+	input_sync(input);
+	input_report_key(input, keycode, 0);
+	input_sync(input);
 }
 
 /* ACPI device for hotkey handling */
-- 
2.12.0