fujitsu-laptop: Simplify SBLL/SBL2 backlight handling

GBLS and GBLL only differ in the clearing of the GHKS flag, so there is no need
to have two backlight level readouts. Also, per Peter Gruber, the need for the
BLNF check has disappeared.
As a result, cleanups can be made in the code. This has been tested on the both
the S6410 and the S6420 platforms and causes no functionality regressions, on
the console without X or within X. One module parameter to disable the hotkeys
is dropped, as we only ever took one codepath anyway.
Signed-off-by: Tony Vroon <tony@linx.net>
Tested-by: Peter Gruber <nokos@gmx.net>
Tested-By: Stephen Gildea <stepheng+linux@gildea.com>
Acked-by: Jonathan Woithe <jwoithe@physics.adelaide.edu.au>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/misc/fujitsu-laptop.c

@@ -155,7 +155,6 @@ struct fujitsu_t {
 
 static struct fujitsu_t *fujitsu;
 static int use_alt_lcd_levels = -1;
-static int disable_brightness_keys = -1;
 static int disable_brightness_adjust = -1;
 
 /* Device used to access other hotkeys on the laptop */
@@ -413,35 +412,10 @@ static int get_max_brightness(void)
 	return fujitsu->max_brightness;
 }
 
-static int get_lcd_level_alt(void)
-{
-	unsigned long long state = 0;
-	acpi_status status = AE_OK;
-
-	vdbg_printk(FUJLAPTOP_DBG_TRACE, "get lcd level via GBLS\n");
-
-	status =
-	    acpi_evaluate_integer(fujitsu->acpi_handle, "GBLS", NULL, &state);
-	if (status < 0)
-		return status;
-
-	fujitsu->brightness_level = state & 0x0fffffff;
-
-	if (state & 0x80000000)
-		fujitsu->brightness_changed = 1;
-	else
-		fujitsu->brightness_changed = 0;
-
-	return fujitsu->brightness_level;
-}
-
 /* Backlight device stuff */
 
 static int bl_get_brightness(struct backlight_device *b)
 {
-	if (use_alt_lcd_levels)
-		return get_lcd_level_alt();
-	else
 	return get_lcd_level();
 }
 
@@ -509,9 +483,6 @@ static ssize_t show_lcd_level(struct device *dev,
 
 	int ret;
 
-	if (use_alt_lcd_levels)
-		ret = get_lcd_level_alt();
-	else
 	ret = get_lcd_level();
 	if (ret < 0)
 		return ret;
@@ -537,9 +508,6 @@ static ssize_t store_lcd_level(struct device *dev,
 	if (ret < 0)
 		return ret;
 
-	if (use_alt_lcd_levels)
-		ret = get_lcd_level_alt();
-	else
 	ret = get_lcd_level();
 	if (ret < 0)
 		return ret;
@@ -622,24 +590,16 @@ static struct platform_driver fujitsupf_driver = {
 static void dmi_check_cb_common(const struct dmi_system_id *id)
 {
 	acpi_handle handle;
-	int have_blnf;
 	printk(KERN_INFO "fujitsu-laptop: Identified laptop model '%s'.\n",
 	       id->ident);
-	have_blnf = ACPI_SUCCESS
-	    (acpi_get_handle(NULL, "\\_SB.PCI0.GFX0.LCD.BLNF", &handle));
 	if (use_alt_lcd_levels == -1) {
-		vdbg_printk(FUJLAPTOP_DBG_TRACE, "auto-detecting usealt\n");
+		if (ACPI_SUCCESS(acpi_get_handle(NULL,
+				"\\_SB.PCI0.LPCB.FJEX.SBL2", &handle)))
 			use_alt_lcd_levels = 1;
-	}
-	if (disable_brightness_keys == -1) {
-		vdbg_printk(FUJLAPTOP_DBG_TRACE,
-			    "auto-detecting disable_keys\n");
-		disable_brightness_keys = have_blnf ? 1 : 0;
-	}
-	if (disable_brightness_adjust == -1) {
-		vdbg_printk(FUJLAPTOP_DBG_TRACE,
-			    "auto-detecting disable_adjust\n");
-		disable_brightness_adjust = have_blnf ? 0 : 1;
+		else
+			use_alt_lcd_levels = 0;
+		vdbg_printk(FUJLAPTOP_DBG_TRACE, "auto-detected usealt as "
+			"%i\n", use_alt_lcd_levels);
 	}
 }
 
@@ -768,18 +728,13 @@ static int acpi_fujitsu_add(struct acpi_device *device)
 
 	/* do config (detect defaults) */
 	use_alt_lcd_levels = use_alt_lcd_levels == 1 ? 1 : 0;
-	disable_brightness_keys = disable_brightness_keys == 1 ? 1 : 0;
 	disable_brightness_adjust = disable_brightness_adjust == 1 ? 1 : 0;
 	vdbg_printk(FUJLAPTOP_DBG_INFO,
-		    "config: [alt interface: %d], [key disable: %d], [adjust disable: %d]\n",
-		    use_alt_lcd_levels, disable_brightness_keys,
-		    disable_brightness_adjust);
+		    "config: [alt interface: %d], [adjust disable: %d]\n",
+		    use_alt_lcd_levels, disable_brightness_adjust);
 
 	if (get_max_brightness() <= 0)
 		fujitsu->max_brightness = FUJITSU_LCD_N_LEVELS;
-	if (use_alt_lcd_levels)
-		get_lcd_level_alt();
-	else
 	get_lcd_level();
 
 	return result;
@@ -831,43 +786,23 @@ static void acpi_fujitsu_notify(acpi_handle handle, u32 event, void *data)
 	case ACPI_FUJITSU_NOTIFY_CODE1:
 		keycode = 0;
 		oldb = fujitsu->brightness_level;
-		get_lcd_level();  /* the alt version always yields changed */
+		get_lcd_level();
 		newb = fujitsu->brightness_level;
 
 		vdbg_printk(FUJLAPTOP_DBG_TRACE,
 			    "brightness button event [%i -> %i (%i)]\n",
 			    oldb, newb, fujitsu->brightness_changed);
 
-		if (oldb == newb && fujitsu->brightness_changed) {
-			keycode = 0;
-			if (disable_brightness_keys != 1) {
-				if (oldb == 0) {
-					acpi_bus_generate_proc_event
-					    (fujitsu->dev,
-					     ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS,
-					     0);
-					keycode = KEY_BRIGHTNESSDOWN;
-				} else if (oldb ==
-					   (fujitsu->max_brightness) - 1) {
-					acpi_bus_generate_proc_event
-					    (fujitsu->dev,
-					     ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS,
-					     0);
-					keycode = KEY_BRIGHTNESSUP;
-				}
-			}
-		} else if (oldb < newb) {
+		if (oldb < newb) {
 			if (disable_brightness_adjust != 1) {
 				if (use_alt_lcd_levels)
 					set_lcd_level_alt(newb);
 				else
 					set_lcd_level(newb);
 			}
-			if (disable_brightness_keys != 1) {
 			acpi_bus_generate_proc_event(fujitsu->dev,
 				ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS, 0);
 			keycode = KEY_BRIGHTNESSUP;
-			}
 		} else if (oldb > newb) {
 			if (disable_brightness_adjust != 1) {
 				if (use_alt_lcd_levels)
@@ -875,14 +810,10 @@ static void acpi_fujitsu_notify(acpi_handle handle, u32 event, void *data)
 				else
 					set_lcd_level(newb);
 			}
-			if (disable_brightness_keys != 1) {
 			acpi_bus_generate_proc_event(fujitsu->dev,
 				ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS, 0);
 			keycode = KEY_BRIGHTNESSDOWN;
 		}
-		} else {
-			keycode = KEY_UNKNOWN;
-		}
 		break;
 	default:
 		keycode = KEY_UNKNOWN;
@@ -1336,9 +1267,6 @@ module_exit(fujitsu_cleanup);
 module_param(use_alt_lcd_levels, uint, 0644);
 MODULE_PARM_DESC(use_alt_lcd_levels,
 		 "Use alternative interface for lcd_levels (needed for Lifebook s6410).");
-module_param(disable_brightness_keys, uint, 0644);
-MODULE_PARM_DESC(disable_brightness_keys,
-		 "Disable brightness keys (eg. if they are already handled by the generic ACPI_VIDEO device).");
 module_param(disable_brightness_adjust, uint, 0644);
 MODULE_PARM_DESC(disable_brightness_adjust, "Disable brightness adjustment .");
 #ifdef CONFIG_FUJITSU_LAPTOP_DEBUG