staging: panel: Use defined value or checking module params state

Avoid magic number and use a comparison with a defined value instead
that checks whether module param has been set by the user to some
value at loading time.

Signed-off-by: Mariusz Gorski <marius.gorski@gmail.com>
Acked-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/panel/panel.c

@@ -1411,29 +1411,29 @@ static void lcd_init(void)
 	switch (lcd_type) {
 	case LCD_TYPE_OLD:
 		/* parallel mode, 8 bits */
-		if (lcd_proto < 0)
+		if (lcd_proto == NOT_SET)
 			lcd_proto = LCD_PROTO_PARALLEL;
-		if (lcd_charset < 0)
+		if (lcd_charset == NOT_SET)
 			lcd_charset = LCD_CHARSET_NORMAL;
 		if (lcd_e_pin == PIN_NOT_SET)
 			lcd_e_pin = PIN_STROBE;
 		if (lcd_rs_pin == PIN_NOT_SET)
 			lcd_rs_pin = PIN_AUTOLF;
 
-		if (lcd_width < 0)
+		if (lcd_width == NOT_SET)
 			lcd_width = 40;
-		if (lcd_bwidth < 0)
+		if (lcd_bwidth == NOT_SET)
 			lcd_bwidth = 40;
-		if (lcd_hwidth < 0)
+		if (lcd_hwidth == NOT_SET)
 			lcd_hwidth = 64;
-		if (lcd_height < 0)
+		if (lcd_height == NOT_SET)
 			lcd_height = 2;
 		break;
 	case LCD_TYPE_KS0074:
 		/* serial mode, ks0074 */
-		if (lcd_proto < 0)
+		if (lcd_proto == NOT_SET)
 			lcd_proto = LCD_PROTO_SERIAL;
-		if (lcd_charset < 0)
+		if (lcd_charset == NOT_SET)
 			lcd_charset = LCD_CHARSET_KS0074;
 		if (lcd_bl_pin == PIN_NOT_SET)
 			lcd_bl_pin = PIN_AUTOLF;
@@ -1442,20 +1442,20 @@ static void lcd_init(void)
 		if (lcd_da_pin == PIN_NOT_SET)
 			lcd_da_pin = PIN_D0;
 
-		if (lcd_width < 0)
+		if (lcd_width == NOT_SET)
 			lcd_width = 16;
-		if (lcd_bwidth < 0)
+		if (lcd_bwidth == NOT_SET)
 			lcd_bwidth = 40;
-		if (lcd_hwidth < 0)
+		if (lcd_hwidth == NOT_SET)
 			lcd_hwidth = 16;
-		if (lcd_height < 0)
+		if (lcd_height == NOT_SET)
 			lcd_height = 2;
 		break;
 	case LCD_TYPE_NEXCOM:
 		/* parallel mode, 8 bits, generic */
-		if (lcd_proto < 0)
+		if (lcd_proto == NOT_SET)
 			lcd_proto = LCD_PROTO_PARALLEL;
-		if (lcd_charset < 0)
+		if (lcd_charset == NOT_SET)
 			lcd_charset = LCD_CHARSET_NORMAL;
 		if (lcd_e_pin == PIN_NOT_SET)
 			lcd_e_pin = PIN_AUTOLF;
@@ -1464,42 +1464,42 @@ static void lcd_init(void)
 		if (lcd_rw_pin == PIN_NOT_SET)
 			lcd_rw_pin = PIN_INITP;
 
-		if (lcd_width < 0)
+		if (lcd_width == NOT_SET)
 			lcd_width = 16;
-		if (lcd_bwidth < 0)
+		if (lcd_bwidth == NOT_SET)
 			lcd_bwidth = 40;
-		if (lcd_hwidth < 0)
+		if (lcd_hwidth == NOT_SET)
 			lcd_hwidth = 64;
-		if (lcd_height < 0)
+		if (lcd_height == NOT_SET)
 			lcd_height = 2;
 		break;
 	case LCD_TYPE_CUSTOM:
 		/* customer-defined */
-		if (lcd_proto < 0)
+		if (lcd_proto == NOT_SET)
 			lcd_proto = DEFAULT_LCD_PROTO;
-		if (lcd_charset < 0)
+		if (lcd_charset == NOT_SET)
 			lcd_charset = DEFAULT_LCD_CHARSET;
 		/* default geometry will be set later */
 		break;
 	case LCD_TYPE_HANTRONIX:
 		/* parallel mode, 8 bits, hantronix-like */
 	default:
-		if (lcd_proto < 0)
+		if (lcd_proto == NOT_SET)
 			lcd_proto = LCD_PROTO_PARALLEL;
-		if (lcd_charset < 0)
+		if (lcd_charset == NOT_SET)
 			lcd_charset = LCD_CHARSET_NORMAL;
 		if (lcd_e_pin == PIN_NOT_SET)
 			lcd_e_pin = PIN_STROBE;
 		if (lcd_rs_pin == PIN_NOT_SET)
 			lcd_rs_pin = PIN_SELECP;
 
-		if (lcd_width < 0)
+		if (lcd_width == NOT_SET)
 			lcd_width = 16;
-		if (lcd_bwidth < 0)
+		if (lcd_bwidth == NOT_SET)
 			lcd_bwidth = 40;
-		if (lcd_hwidth < 0)
+		if (lcd_hwidth == NOT_SET)
 			lcd_hwidth = 64;
-		if (lcd_height < 0)
+		if (lcd_height == NOT_SET)
 			lcd_height = 2;
 		break;
 	}
@@ -1557,7 +1557,7 @@ static void lcd_init(void)
 	if (lcd_da_pin == PIN_NOT_SET)
 		lcd_da_pin = PIN_NONE;
 
-	if (lcd_charset < 0)
+	if (lcd_charset == NOT_SET)
 		lcd_charset = DEFAULT_LCD_CHARSET;
 
 	if (lcd_charset == LCD_CHARSET_KS0074)
@@ -2227,58 +2227,58 @@ static struct parport_driver panel_driver = {
 static int __init panel_init_module(void)
 {
 	/* for backwards compatibility */
-	if (keypad_type < 0)
+	if (keypad_type == NOT_SET)
 		keypad_type = keypad_enabled;
 
-	if (lcd_type < 0)
+	if (lcd_type == NOT_SET)
 		lcd_type = lcd_enabled;
 
 	/* take care of an eventual profile */
 	switch (profile) {
 	case PANEL_PROFILE_CUSTOM:
 		/* custom profile */
-		if (keypad_type < 0)
+		if (keypad_type == NOT_SET)
 			keypad_type = DEFAULT_KEYPAD_TYPE;
-		if (lcd_type < 0)
+		if (lcd_type == NOT_SET)
 			lcd_type = DEFAULT_LCD_TYPE;
 		break;
 	case PANEL_PROFILE_OLD:
 		/* 8 bits, 2*16, old keypad */
-		if (keypad_type < 0)
+		if (keypad_type == NOT_SET)
 			keypad_type = KEYPAD_TYPE_OLD;
-		if (lcd_type < 0)
+		if (lcd_type == NOT_SET)
 			lcd_type = LCD_TYPE_OLD;
-		if (lcd_width < 0)
+		if (lcd_width == NOT_SET)
 			lcd_width = 16;
-		if (lcd_hwidth < 0)
+		if (lcd_hwidth == NOT_SET)
 			lcd_hwidth = 16;
 		break;
 	case PANEL_PROFILE_NEW:
 		/* serial, 2*16, new keypad */
-		if (keypad_type < 0)
+		if (keypad_type == NOT_SET)
 			keypad_type = KEYPAD_TYPE_NEW;
-		if (lcd_type < 0)
+		if (lcd_type == NOT_SET)
 			lcd_type = LCD_TYPE_KS0074;
 		break;
 	case PANEL_PROFILE_HANTRONIX:
 		/* 8 bits, 2*16 hantronix-like, no keypad */
-		if (keypad_type < 0)
+		if (keypad_type == NOT_SET)
 			keypad_type = KEYPAD_TYPE_NONE;
-		if (lcd_type < 0)
+		if (lcd_type == NOT_SET)
 			lcd_type = LCD_TYPE_HANTRONIX;
 		break;
 	case PANEL_PROFILE_NEXCOM:
 		/* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
-		if (keypad_type < 0)
+		if (keypad_type == NOT_SET)
 			keypad_type = KEYPAD_TYPE_NEXCOM;
-		if (lcd_type < 0)
+		if (lcd_type == NOT_SET)
 			lcd_type = LCD_TYPE_NEXCOM;
 		break;
 	case PANEL_PROFILE_LARGE:
 		/* 8 bits, 2*40, old keypad */
-		if (keypad_type < 0)
+		if (keypad_type == NOT_SET)
 			keypad_type = KEYPAD_TYPE_OLD;
-		if (lcd_type < 0)
+		if (lcd_type == NOT_SET)
 			lcd_type = LCD_TYPE_OLD;
 		break;
 	}