auxdisplay: Move ifwidth to struct hd44780_common

Move struct charlcd member ifwidth to our new struct hd44780_common.
ifwidth is hd44780 device specific and is used by two drivers at the
moment, so we move it to a common place, where both can use this.
Reviewed-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

drivers/auxdisplay/charlcd.c

@@ -223,9 +223,10 @@ static int charlcd_init_display(struct charlcd *lcd)
 {
 	void (*write_cmd_raw)(struct charlcd *lcd, int cmd);
 	struct charlcd_priv *priv = charlcd_to_priv(lcd);
+	struct hd44780_common *hdc = lcd->drvdata;
 	u8 init;
 
-	if (lcd->ifwidth != 4 && lcd->ifwidth != 8)
+	if (hdc->ifwidth != 4 && hdc->ifwidth != 8)
 		return -EINVAL;
 
 	priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |
@@ -238,7 +239,7 @@ static int charlcd_init_display(struct charlcd *lcd)
 	 * the LCD is in 8-bit mode afterwards
 	 */
 	init = LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS;
-	if (lcd->ifwidth == 4) {
+	if (hdc->ifwidth == 4) {
 		init >>= 4;
 		write_cmd_raw = lcd->ops->write_cmd_raw4;
 	} else {
@@ -251,7 +252,7 @@ static int charlcd_init_display(struct charlcd *lcd)
 	write_cmd_raw(lcd, init);
 	long_sleep(10);
 
-	if (lcd->ifwidth == 4) {
+	if (hdc->ifwidth == 4) {
 		/* Switch to 4-bit mode, 1 line, small fonts */
 		lcd->ops->write_cmd_raw4(lcd, LCD_CMD_FUNCTION_SET >> 4);
 		long_sleep(10);
@@ -260,7 +261,7 @@ static int charlcd_init_display(struct charlcd *lcd)
 	/* set font height and lines number */
 	lcd->ops->write_cmd(lcd,
 		LCD_CMD_FUNCTION_SET |
-		((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
+		((hdc->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
 		((priv->flags & LCD_FLAG_F) ? LCD_CMD_FONT_5X10_DOTS : 0) |
 		((priv->flags & LCD_FLAG_N) ? LCD_CMD_TWO_LINES : 0));
 	long_sleep(10);
@@ -543,7 +544,7 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
 	else if ((oldflags ^ priv->flags) & (LCD_FLAG_F | LCD_FLAG_N))
 		lcd->ops->write_cmd(lcd,
 			LCD_CMD_FUNCTION_SET |
-			((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
+			((hdc->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
 			((priv->flags & LCD_FLAG_F) ? LCD_CMD_FONT_5X10_DOTS : 0) |
 			((priv->flags & LCD_FLAG_N) ? LCD_CMD_TWO_LINES : 0));
 	/* check whether L flag was changed */
@@ -794,7 +795,6 @@ struct charlcd *charlcd_alloc(void)
 	priv->esc_seq.len = -1;
 
 	lcd = &priv->lcd;
-	lcd->ifwidth = 8;
 
 	return lcd;
 }

drivers/auxdisplay/charlcd.h

@@ -18,7 +18,6 @@ struct charlcd {
 	const struct charlcd_ops *ops;
 	const unsigned char *char_conv;	/* Optional */
 
-	int ifwidth;			/* 4-bit or 8-bit (default) */
 	int height;
 	int width;
 

drivers/auxdisplay/hd44780.c

@@ -275,7 +275,7 @@ static int hd44780_probe(struct platform_device *pdev)
 	/* Optional properties */
 	device_property_read_u32(dev, "internal-buffer-width", &hdc->bwidth);
 
-	lcd->ifwidth = ifwidth;
+	hdc->ifwidth = ifwidth;
 	lcd->ops = ifwidth == 8 ? &hd44780_ops_gpio8 : &hd44780_ops_gpio4;
 
 	ret = charlcd_register(lcd);

drivers/auxdisplay/hd44780_common.c

@@ -12,6 +12,7 @@ struct hd44780_common *hd44780_common_alloc(void)
 	if (!hd)
 		return NULL;
 
+	hd->ifwidth = 8;
 	hd->bwidth = DEFAULT_LCD_BWIDTH;
 	hd->hwidth = DEFAULT_LCD_HWIDTH;
 	return hd;

drivers/auxdisplay/hd44780_common.h

@@ -4,6 +4,7 @@
 #define DEFAULT_LCD_HWIDTH      64
 
 struct hd44780_common {
+	int ifwidth;			/* 4-bit or 8-bit (default) */
 	int bwidth;			/* Default set by hd44780_alloc() */
 	int hwidth;			/* Default set by hd44780_alloc() */
 	void *hd44780;